| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Linux Socket Filter - Kernel level socket filtering |
| * |
| * Based on the design of the Berkeley Packet Filter. The new |
| * internal format has been designed by PLUMgrid: |
| * |
| * Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com |
| * |
| * Authors: |
| * |
| * Jay Schulist <jschlst@samba.org> |
| * Alexei Starovoitov <ast@plumgrid.com> |
| * Daniel Borkmann <dborkman@redhat.com> |
| * |
| * Andi Kleen - Fix a few bad bugs and races. |
| * Kris Katterjohn - Added many additional checks in bpf_check_classic() |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/mm.h> |
| #include <linux/fcntl.h> |
| #include <linux/socket.h> |
| #include <linux/sock_diag.h> |
| #include <linux/in.h> |
| #include <linux/inet.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_packet.h> |
| #include <linux/if_arp.h> |
| #include <linux/gfp.h> |
| #include <net/inet_common.h> |
| #include <net/ip.h> |
| #include <net/protocol.h> |
| #include <net/netlink.h> |
| #include <linux/skbuff.h> |
| #include <linux/skmsg.h> |
| #include <net/sock.h> |
| #include <net/flow_dissector.h> |
| #include <linux/errno.h> |
| #include <linux/timer.h> |
| #include <linux/uaccess.h> |
| #include <asm/unaligned.h> |
| #include <asm/cmpxchg.h> |
| #include <linux/filter.h> |
| #include <linux/ratelimit.h> |
| #include <linux/seccomp.h> |
| #include <linux/if_vlan.h> |
| #include <linux/bpf.h> |
| #include <linux/btf.h> |
| #include <net/sch_generic.h> |
| #include <net/cls_cgroup.h> |
| #include <net/dst_metadata.h> |
| #include <net/dst.h> |
| #include <net/sock_reuseport.h> |
| #include <net/busy_poll.h> |
| #include <net/tcp.h> |
| #include <net/xfrm.h> |
| #include <net/udp.h> |
| #include <linux/bpf_trace.h> |
| #include <net/xdp_sock.h> |
| #include <linux/inetdevice.h> |
| #include <net/inet_hashtables.h> |
| #include <net/inet6_hashtables.h> |
| #include <net/ip_fib.h> |
| #include <net/nexthop.h> |
| #include <net/flow.h> |
| #include <net/arp.h> |
| #include <net/ipv6.h> |
| #include <net/net_namespace.h> |
| #include <linux/seg6_local.h> |
| #include <net/seg6.h> |
| #include <net/seg6_local.h> |
| #include <net/lwtunnel.h> |
| #include <net/ipv6_stubs.h> |
| #include <net/bpf_sk_storage.h> |
| #include <net/transp_v6.h> |
| #include <linux/btf_ids.h> |
| |
| int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len) |
| { |
| if (in_compat_syscall()) { |
| struct compat_sock_fprog f32; |
| |
| if (len != sizeof(f32)) |
| return -EINVAL; |
| if (copy_from_sockptr(&f32, src, sizeof(f32))) |
| return -EFAULT; |
| memset(dst, 0, sizeof(*dst)); |
| dst->len = f32.len; |
| dst->filter = compat_ptr(f32.filter); |
| } else { |
| if (len != sizeof(*dst)) |
| return -EINVAL; |
| if (copy_from_sockptr(dst, src, sizeof(*dst))) |
| return -EFAULT; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user); |
| |
| /** |
| * sk_filter_trim_cap - run a packet through a socket filter |
| * @sk: sock associated with &sk_buff |
| * @skb: buffer to filter |
| * @cap: limit on how short the eBPF program may trim the packet |
| * |
| * Run the eBPF program and then cut skb->data to correct size returned by |
| * the program. If pkt_len is 0 we toss packet. If skb->len is smaller |
| * than pkt_len we keep whole skb->data. This is the socket level |
| * wrapper to BPF_PROG_RUN. It returns 0 if the packet should |
| * be accepted or -EPERM if the packet should be tossed. |
| * |
| */ |
| int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap) |
| { |
| int err; |
| struct sk_filter *filter; |
| |
| /* |
| * If the skb was allocated from pfmemalloc reserves, only |
| * allow SOCK_MEMALLOC sockets to use it as this socket is |
| * helping free memory |
| */ |
| if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) { |
| NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP); |
| return -ENOMEM; |
| } |
| err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb); |
| if (err) |
| return err; |
| |
| err = security_sock_rcv_skb(sk, skb); |
| if (err) |
| return err; |
| |
| rcu_read_lock(); |
| filter = rcu_dereference(sk->sk_filter); |
| if (filter) { |
| struct sock *save_sk = skb->sk; |
| unsigned int pkt_len; |
| |
| skb->sk = sk; |
| pkt_len = bpf_prog_run_save_cb(filter->prog, skb); |
| skb->sk = save_sk; |
| err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM; |
| } |
| rcu_read_unlock(); |
| |
| return err; |
| } |
| EXPORT_SYMBOL(sk_filter_trim_cap); |
| |
| BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb) |
| { |
| return skb_get_poff(skb); |
| } |
| |
| BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x) |
| { |
| struct nlattr *nla; |
| |
| if (skb_is_nonlinear(skb)) |
| return 0; |
| |
| if (skb->len < sizeof(struct nlattr)) |
| return 0; |
| |
| if (a > skb->len - sizeof(struct nlattr)) |
| return 0; |
| |
| nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x); |
| if (nla) |
| return (void *) nla - (void *) skb->data; |
| |
| return 0; |
| } |
| |
| BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x) |
| { |
| struct nlattr *nla; |
| |
| if (skb_is_nonlinear(skb)) |
| return 0; |
| |
| if (skb->len < sizeof(struct nlattr)) |
| return 0; |
| |
| if (a > skb->len - sizeof(struct nlattr)) |
| return 0; |
| |
| nla = (struct nlattr *) &skb->data[a]; |
| if (nla->nla_len > skb->len - a) |
| return 0; |
| |
| nla = nla_find_nested(nla, x); |
| if (nla) |
| return (void *) nla - (void *) skb->data; |
| |
| return 0; |
| } |
| |
| BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *, |
| data, int, headlen, int, offset) |
| { |
| u8 tmp, *ptr; |
| const int len = sizeof(tmp); |
| |
| if (offset >= 0) { |
| if (headlen - offset >= len) |
| return *(u8 *)(data + offset); |
| if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) |
| return tmp; |
| } else { |
| ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); |
| if (likely(ptr)) |
| return *(u8 *)ptr; |
| } |
| |
| return -EFAULT; |
| } |
| |
| BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb, |
| int, offset) |
| { |
| return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len, |
| offset); |
| } |
| |
| BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *, |
| data, int, headlen, int, offset) |
| { |
| u16 tmp, *ptr; |
| const int len = sizeof(tmp); |
| |
| if (offset >= 0) { |
| if (headlen - offset >= len) |
| return get_unaligned_be16(data + offset); |
| if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) |
| return be16_to_cpu(tmp); |
| } else { |
| ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); |
| if (likely(ptr)) |
| return get_unaligned_be16(ptr); |
| } |
| |
| return -EFAULT; |
| } |
| |
| BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb, |
| int, offset) |
| { |
| return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len, |
| offset); |
| } |
| |
| BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *, |
| data, int, headlen, int, offset) |
| { |
| u32 tmp, *ptr; |
| const int len = sizeof(tmp); |
| |
| if (likely(offset >= 0)) { |
| if (headlen - offset >= len) |
| return get_unaligned_be32(data + offset); |
| if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp))) |
| return be32_to_cpu(tmp); |
| } else { |
| ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len); |
| if (likely(ptr)) |
| return get_unaligned_be32(ptr); |
| } |
| |
| return -EFAULT; |
| } |
| |
| BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb, |
| int, offset) |
| { |
| return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len, |
| offset); |
| } |
| |
| static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg, |
| struct bpf_insn *insn_buf) |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| switch (skb_field) { |
| case SKF_AD_MARK: |
| BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4); |
| |
| *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg, |
| offsetof(struct sk_buff, mark)); |
| break; |
| |
| case SKF_AD_PKTTYPE: |
| *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET()); |
| *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX); |
| #ifdef __BIG_ENDIAN_BITFIELD |
| *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5); |
| #endif |
| break; |
| |
| case SKF_AD_QUEUE: |
| BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, |
| offsetof(struct sk_buff, queue_mapping)); |
| break; |
| |
| case SKF_AD_VLAN_TAG: |
| BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2); |
| |
| /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */ |
| *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg, |
| offsetof(struct sk_buff, vlan_tci)); |
| break; |
| case SKF_AD_VLAN_TAG_PRESENT: |
| *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET()); |
| if (PKT_VLAN_PRESENT_BIT) |
| *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT); |
| if (PKT_VLAN_PRESENT_BIT < 7) |
| *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| static bool convert_bpf_extensions(struct sock_filter *fp, |
| struct bpf_insn **insnp) |
| { |
| struct bpf_insn *insn = *insnp; |
| u32 cnt; |
| |
| switch (fp->k) { |
| case SKF_AD_OFF + SKF_AD_PROTOCOL: |
| BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2); |
| |
| /* A = *(u16 *) (CTX + offsetof(protocol)) */ |
| *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, |
| offsetof(struct sk_buff, protocol)); |
| /* A = ntohs(A) [emitting a nop or swap16] */ |
| *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_PKTTYPE: |
| cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn); |
| insn += cnt - 1; |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_IFINDEX: |
| case SKF_AD_OFF + SKF_AD_HATYPE: |
| BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4); |
| BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
| BPF_REG_TMP, BPF_REG_CTX, |
| offsetof(struct sk_buff, dev)); |
| /* if (tmp != 0) goto pc + 1 */ |
| *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1); |
| *insn++ = BPF_EXIT_INSN(); |
| if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX) |
| *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP, |
| offsetof(struct net_device, ifindex)); |
| else |
| *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP, |
| offsetof(struct net_device, type)); |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_MARK: |
| cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn); |
| insn += cnt - 1; |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_RXHASH: |
| BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4); |
| |
| *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, |
| offsetof(struct sk_buff, hash)); |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_QUEUE: |
| cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn); |
| insn += cnt - 1; |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_VLAN_TAG: |
| cnt = convert_skb_access(SKF_AD_VLAN_TAG, |
| BPF_REG_A, BPF_REG_CTX, insn); |
| insn += cnt - 1; |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT: |
| cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT, |
| BPF_REG_A, BPF_REG_CTX, insn); |
| insn += cnt - 1; |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_VLAN_TPID: |
| BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2); |
| |
| /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */ |
| *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX, |
| offsetof(struct sk_buff, vlan_proto)); |
| /* A = ntohs(A) [emitting a nop or swap16] */ |
| *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16); |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_PAY_OFFSET: |
| case SKF_AD_OFF + SKF_AD_NLATTR: |
| case SKF_AD_OFF + SKF_AD_NLATTR_NEST: |
| case SKF_AD_OFF + SKF_AD_CPU: |
| case SKF_AD_OFF + SKF_AD_RANDOM: |
| /* arg1 = CTX */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); |
| /* arg2 = A */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A); |
| /* arg3 = X */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X); |
| /* Emit call(arg1=CTX, arg2=A, arg3=X) */ |
| switch (fp->k) { |
| case SKF_AD_OFF + SKF_AD_PAY_OFFSET: |
| *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset); |
| break; |
| case SKF_AD_OFF + SKF_AD_NLATTR: |
| *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr); |
| break; |
| case SKF_AD_OFF + SKF_AD_NLATTR_NEST: |
| *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest); |
| break; |
| case SKF_AD_OFF + SKF_AD_CPU: |
| *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id); |
| break; |
| case SKF_AD_OFF + SKF_AD_RANDOM: |
| *insn = BPF_EMIT_CALL(bpf_user_rnd_u32); |
| bpf_user_rnd_init_once(); |
| break; |
| } |
| break; |
| |
| case SKF_AD_OFF + SKF_AD_ALU_XOR_X: |
| /* A ^= X */ |
| *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X); |
| break; |
| |
| default: |
| /* This is just a dummy call to avoid letting the compiler |
| * evict __bpf_call_base() as an optimization. Placed here |
| * where no-one bothers. |
| */ |
| BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0); |
| return false; |
| } |
| |
| *insnp = insn; |
| return true; |
| } |
| |
| static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp) |
| { |
| const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS); |
| int size = bpf_size_to_bytes(BPF_SIZE(fp->code)); |
| bool endian = BPF_SIZE(fp->code) == BPF_H || |
| BPF_SIZE(fp->code) == BPF_W; |
| bool indirect = BPF_MODE(fp->code) == BPF_IND; |
| const int ip_align = NET_IP_ALIGN; |
| struct bpf_insn *insn = *insnp; |
| int offset = fp->k; |
| |
| if (!indirect && |
| ((unaligned_ok && offset >= 0) || |
| (!unaligned_ok && offset >= 0 && |
| offset + ip_align >= 0 && |
| offset + ip_align % size == 0))) { |
| bool ldx_off_ok = offset <= S16_MAX; |
| |
| *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H); |
| if (offset) |
| *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset); |
| *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP, |
| size, 2 + endian + (!ldx_off_ok * 2)); |
| if (ldx_off_ok) { |
| *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, |
| BPF_REG_D, offset); |
| } else { |
| *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D); |
| *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset); |
| *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A, |
| BPF_REG_TMP, 0); |
| } |
| if (endian) |
| *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8); |
| *insn++ = BPF_JMP_A(8); |
| } |
| |
| *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX); |
| *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D); |
| *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H); |
| if (!indirect) { |
| *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset); |
| } else { |
| *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X); |
| if (fp->k) |
| *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset); |
| } |
| |
| switch (BPF_SIZE(fp->code)) { |
| case BPF_B: |
| *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8); |
| break; |
| case BPF_H: |
| *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16); |
| break; |
| case BPF_W: |
| *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32); |
| break; |
| default: |
| return false; |
| } |
| |
| *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2); |
| *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); |
| *insn = BPF_EXIT_INSN(); |
| |
| *insnp = insn; |
| return true; |
| } |
| |
| /** |
| * bpf_convert_filter - convert filter program |
| * @prog: the user passed filter program |
| * @len: the length of the user passed filter program |
| * @new_prog: allocated 'struct bpf_prog' or NULL |
| * @new_len: pointer to store length of converted program |
| * @seen_ld_abs: bool whether we've seen ld_abs/ind |
| * |
| * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn' |
| * style extended BPF (eBPF). |
| * Conversion workflow: |
| * |
| * 1) First pass for calculating the new program length: |
| * bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs) |
| * |
| * 2) 2nd pass to remap in two passes: 1st pass finds new |
| * jump offsets, 2nd pass remapping: |
| * bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs) |
| */ |
| static int bpf_convert_filter(struct sock_filter *prog, int len, |
| struct bpf_prog *new_prog, int *new_len, |
| bool *seen_ld_abs) |
| { |
| int new_flen = 0, pass = 0, target, i, stack_off; |
| struct bpf_insn *new_insn, *first_insn = NULL; |
| struct sock_filter *fp; |
| int *addrs = NULL; |
| u8 bpf_src; |
| |
| BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK); |
| BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG); |
| |
| if (len <= 0 || len > BPF_MAXINSNS) |
| return -EINVAL; |
| |
| if (new_prog) { |
| first_insn = new_prog->insnsi; |
| addrs = kcalloc(len, sizeof(*addrs), |
| GFP_KERNEL | __GFP_NOWARN); |
| if (!addrs) |
| return -ENOMEM; |
| } |
| |
| do_pass: |
| new_insn = first_insn; |
| fp = prog; |
| |
| /* Classic BPF related prologue emission. */ |
| if (new_prog) { |
| /* Classic BPF expects A and X to be reset first. These need |
| * to be guaranteed to be the first two instructions. |
| */ |
| *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); |
| *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X); |
| |
| /* All programs must keep CTX in callee saved BPF_REG_CTX. |
| * In eBPF case it's done by the compiler, here we need to |
| * do this ourself. Initial CTX is present in BPF_REG_ARG1. |
| */ |
| *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1); |
| if (*seen_ld_abs) { |
| /* For packet access in classic BPF, cache skb->data |
| * in callee-saved BPF R8 and skb->len - skb->data_len |
| * (headlen) in BPF R9. Since classic BPF is read-only |
| * on CTX, we only need to cache it once. |
| */ |
| *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), |
| BPF_REG_D, BPF_REG_CTX, |
| offsetof(struct sk_buff, data)); |
| *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX, |
| offsetof(struct sk_buff, len)); |
| *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX, |
| offsetof(struct sk_buff, data_len)); |
| *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP); |
| } |
| } else { |
| new_insn += 3; |
| } |
| |
| for (i = 0; i < len; fp++, i++) { |
| struct bpf_insn tmp_insns[32] = { }; |
| struct bpf_insn *insn = tmp_insns; |
| |
| if (addrs) |
| addrs[i] = new_insn - first_insn; |
| |
| switch (fp->code) { |
| /* All arithmetic insns and skb loads map as-is. */ |
| case BPF_ALU | BPF_ADD | BPF_X: |
| case BPF_ALU | BPF_ADD | BPF_K: |
| case BPF_ALU | BPF_SUB | BPF_X: |
| case BPF_ALU | BPF_SUB | BPF_K: |
| case BPF_ALU | BPF_AND | BPF_X: |
| case BPF_ALU | BPF_AND | BPF_K: |
| case BPF_ALU | BPF_OR | BPF_X: |
| case BPF_ALU | BPF_OR | BPF_K: |
| case BPF_ALU | BPF_LSH | BPF_X: |
| case BPF_ALU | BPF_LSH | BPF_K: |
| case BPF_ALU | BPF_RSH | BPF_X: |
| case BPF_ALU | BPF_RSH | BPF_K: |
| case BPF_ALU | BPF_XOR | BPF_X: |
| case BPF_ALU | BPF_XOR | BPF_K: |
| case BPF_ALU | BPF_MUL | BPF_X: |
| case BPF_ALU | BPF_MUL | BPF_K: |
| case BPF_ALU | BPF_DIV | BPF_X: |
| case BPF_ALU | BPF_DIV | BPF_K: |
| case BPF_ALU | BPF_MOD | BPF_X: |
| case BPF_ALU | BPF_MOD | BPF_K: |
| case BPF_ALU | BPF_NEG: |
| case BPF_LD | BPF_ABS | BPF_W: |
| case BPF_LD | BPF_ABS | BPF_H: |
| case BPF_LD | BPF_ABS | BPF_B: |
| case BPF_LD | BPF_IND | BPF_W: |
| case BPF_LD | BPF_IND | BPF_H: |
| case BPF_LD | BPF_IND | BPF_B: |
| /* Check for overloaded BPF extension and |
| * directly convert it if found, otherwise |
| * just move on with mapping. |
| */ |
| if (BPF_CLASS(fp->code) == BPF_LD && |
| BPF_MODE(fp->code) == BPF_ABS && |
| convert_bpf_extensions(fp, &insn)) |
| break; |
| if (BPF_CLASS(fp->code) == BPF_LD && |
| convert_bpf_ld_abs(fp, &insn)) { |
| *seen_ld_abs = true; |
| break; |
| } |
| |
| if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) || |
| fp->code == (BPF_ALU | BPF_MOD | BPF_X)) { |
| *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X); |
| /* Error with exception code on div/mod by 0. |
| * For cBPF programs, this was always return 0. |
| */ |
| *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2); |
| *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A); |
| *insn++ = BPF_EXIT_INSN(); |
| } |
| |
| *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k); |
| break; |
| |
| /* Jump transformation cannot use BPF block macros |
| * everywhere as offset calculation and target updates |
| * require a bit more work than the rest, i.e. jump |
| * opcodes map as-is, but offsets need adjustment. |
| */ |
| |
| #define BPF_EMIT_JMP \ |
| do { \ |
| const s32 off_min = S16_MIN, off_max = S16_MAX; \ |
| s32 off; \ |
| \ |
| if (target >= len || target < 0) \ |
| goto err; \ |
| off = addrs ? addrs[target] - addrs[i] - 1 : 0; \ |
| /* Adjust pc relative offset for 2nd or 3rd insn. */ \ |
| off -= insn - tmp_insns; \ |
| /* Reject anything not fitting into insn->off. */ \ |
| if (off < off_min || off > off_max) \ |
| goto err; \ |
| insn->off = off; \ |
| } while (0) |
| |
| case BPF_JMP | BPF_JA: |
| target = i + fp->k + 1; |
| insn->code = fp->code; |
| BPF_EMIT_JMP; |
| break; |
| |
| case BPF_JMP | BPF_JEQ | BPF_K: |
| case BPF_JMP | BPF_JEQ | BPF_X: |
| case BPF_JMP | BPF_JSET | BPF_K: |
| case BPF_JMP | BPF_JSET | BPF_X: |
| case BPF_JMP | BPF_JGT | BPF_K: |
| case BPF_JMP | BPF_JGT | BPF_X: |
| case BPF_JMP | BPF_JGE | BPF_K: |
| case BPF_JMP | BPF_JGE | BPF_X: |
| if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) { |
| /* BPF immediates are signed, zero extend |
| * immediate into tmp register and use it |
| * in compare insn. |
| */ |
| *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k); |
| |
| insn->dst_reg = BPF_REG_A; |
| insn->src_reg = BPF_REG_TMP; |
| bpf_src = BPF_X; |
| } else { |
| insn->dst_reg = BPF_REG_A; |
| insn->imm = fp->k; |
| bpf_src = BPF_SRC(fp->code); |
| insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0; |
| } |
| |
| /* Common case where 'jump_false' is next insn. */ |
| if (fp->jf == 0) { |
| insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; |
| target = i + fp->jt + 1; |
| BPF_EMIT_JMP; |
| break; |
| } |
| |
| /* Convert some jumps when 'jump_true' is next insn. */ |
| if (fp->jt == 0) { |
| switch (BPF_OP(fp->code)) { |
| case BPF_JEQ: |
| insn->code = BPF_JMP | BPF_JNE | bpf_src; |
| break; |
| case BPF_JGT: |
| insn->code = BPF_JMP | BPF_JLE | bpf_src; |
| break; |
| case BPF_JGE: |
| insn->code = BPF_JMP | BPF_JLT | bpf_src; |
| break; |
| default: |
| goto jmp_rest; |
| } |
| |
| target = i + fp->jf + 1; |
| BPF_EMIT_JMP; |
| break; |
| } |
| jmp_rest: |
| /* Other jumps are mapped into two insns: Jxx and JA. */ |
| target = i + fp->jt + 1; |
| insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src; |
| BPF_EMIT_JMP; |
| insn++; |
| |
| insn->code = BPF_JMP | BPF_JA; |
| target = i + fp->jf + 1; |
| BPF_EMIT_JMP; |
| break; |
| |
| /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */ |
| case BPF_LDX | BPF_MSH | BPF_B: { |
| struct sock_filter tmp = { |
| .code = BPF_LD | BPF_ABS | BPF_B, |
| .k = fp->k, |
| }; |
| |
| *seen_ld_abs = true; |
| |
| /* X = A */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
| /* A = BPF_R0 = *(u8 *) (skb->data + K) */ |
| convert_bpf_ld_abs(&tmp, &insn); |
| insn++; |
| /* A &= 0xf */ |
| *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf); |
| /* A <<= 2 */ |
| *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2); |
| /* tmp = X */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X); |
| /* X = A */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
| /* A = tmp */ |
| *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP); |
| break; |
| } |
| /* RET_K is remaped into 2 insns. RET_A case doesn't need an |
| * extra mov as BPF_REG_0 is already mapped into BPF_REG_A. |
| */ |
| case BPF_RET | BPF_A: |
| case BPF_RET | BPF_K: |
| if (BPF_RVAL(fp->code) == BPF_K) |
| *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0, |
| 0, fp->k); |
| *insn = BPF_EXIT_INSN(); |
| break; |
| |
| /* Store to stack. */ |
| case BPF_ST: |
| case BPF_STX: |
| stack_off = fp->k * 4 + 4; |
| *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) == |
| BPF_ST ? BPF_REG_A : BPF_REG_X, |
| -stack_off); |
| /* check_load_and_stores() verifies that classic BPF can |
| * load from stack only after write, so tracking |
| * stack_depth for ST|STX insns is enough |
| */ |
| if (new_prog && new_prog->aux->stack_depth < stack_off) |
| new_prog->aux->stack_depth = stack_off; |
| break; |
| |
| /* Load from stack. */ |
| case BPF_LD | BPF_MEM: |
| case BPF_LDX | BPF_MEM: |
| stack_off = fp->k * 4 + 4; |
| *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
| BPF_REG_A : BPF_REG_X, BPF_REG_FP, |
| -stack_off); |
| break; |
| |
| /* A = K or X = K */ |
| case BPF_LD | BPF_IMM: |
| case BPF_LDX | BPF_IMM: |
| *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ? |
| BPF_REG_A : BPF_REG_X, fp->k); |
| break; |
| |
| /* X = A */ |
| case BPF_MISC | BPF_TAX: |
| *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A); |
| break; |
| |
| /* A = X */ |
| case BPF_MISC | BPF_TXA: |
| *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X); |
| break; |
| |
| /* A = skb->len or X = skb->len */ |
| case BPF_LD | BPF_W | BPF_LEN: |
| case BPF_LDX | BPF_W | BPF_LEN: |
| *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ? |
| BPF_REG_A : BPF_REG_X, BPF_REG_CTX, |
| offsetof(struct sk_buff, len)); |
| break; |
| |
| /* Access seccomp_data fields. */ |
| case BPF_LDX | BPF_ABS | BPF_W: |
| /* A = *(u32 *) (ctx + K) */ |
| *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k); |
| break; |
| |
| /* Unknown instruction. */ |
| default: |
| goto err; |
| } |
| |
| insn++; |
| if (new_prog) |
| memcpy(new_insn, tmp_insns, |
| sizeof(*insn) * (insn - tmp_insns)); |
| new_insn += insn - tmp_insns; |
| } |
| |
| if (!new_prog) { |
| /* Only calculating new length. */ |
| *new_len = new_insn - first_insn; |
| if (*seen_ld_abs) |
| *new_len += 4; /* Prologue bits. */ |
| return 0; |
| } |
| |
| pass++; |
| if (new_flen != new_insn - first_insn) { |
| new_flen = new_insn - first_insn; |
| if (pass > 2) |
| goto err; |
| goto do_pass; |
| } |
| |
| kfree(addrs); |
| BUG_ON(*new_len != new_flen); |
| return 0; |
| err: |
| kfree(addrs); |
| return -EINVAL; |
| } |
| |
| /* Security: |
| * |
| * As we dont want to clear mem[] array for each packet going through |
| * __bpf_prog_run(), we check that filter loaded by user never try to read |
| * a cell if not previously written, and we check all branches to be sure |
| * a malicious user doesn't try to abuse us. |
| */ |
| static int check_load_and_stores(const struct sock_filter *filter, int flen) |
| { |
| u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */ |
| int pc, ret = 0; |
| |
| BUILD_BUG_ON(BPF_MEMWORDS > 16); |
| |
| masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL); |
| if (!masks) |
| return -ENOMEM; |
| |
| memset(masks, 0xff, flen * sizeof(*masks)); |
| |
| for (pc = 0; pc < flen; pc++) { |
| memvalid &= masks[pc]; |
| |
| switch (filter[pc].code) { |
| case BPF_ST: |
| case BPF_STX: |
| memvalid |= (1 << filter[pc].k); |
| break; |
| case BPF_LD | BPF_MEM: |
| case BPF_LDX | BPF_MEM: |
| if (!(memvalid & (1 << filter[pc].k))) { |
| ret = -EINVAL; |
| goto error; |
| } |
| break; |
| case BPF_JMP | BPF_JA: |
| /* A jump must set masks on target */ |
| masks[pc + 1 + filter[pc].k] &= memvalid; |
| memvalid = ~0; |
| break; |
| case BPF_JMP | BPF_JEQ | BPF_K: |
| case BPF_JMP | BPF_JEQ | BPF_X: |
| case BPF_JMP | BPF_JGE | BPF_K: |
| case BPF_JMP | BPF_JGE | BPF_X: |
| case BPF_JMP | BPF_JGT | BPF_K: |
| case BPF_JMP | BPF_JGT | BPF_X: |
| case BPF_JMP | BPF_JSET | BPF_K: |
| case BPF_JMP | BPF_JSET | BPF_X: |
| /* A jump must set masks on targets */ |
| masks[pc + 1 + filter[pc].jt] &= memvalid; |
| masks[pc + 1 + filter[pc].jf] &= memvalid; |
| memvalid = ~0; |
| break; |
| } |
| } |
| error: |
| kfree(masks); |
| return ret; |
| } |
| |
| static bool chk_code_allowed(u16 code_to_probe) |
| { |
| static const bool codes[] = { |
| /* 32 bit ALU operations */ |
| [BPF_ALU | BPF_ADD | BPF_K] = true, |
| [BPF_ALU | BPF_ADD | BPF_X] = true, |
| [BPF_ALU | BPF_SUB | BPF_K] = true, |
| [BPF_ALU | BPF_SUB | BPF_X] = true, |
| [BPF_ALU | BPF_MUL | BPF_K] = true, |
| [BPF_ALU | BPF_MUL | BPF_X] = true, |
| [BPF_ALU | BPF_DIV | BPF_K] = true, |
| [BPF_ALU | BPF_DIV | BPF_X] = true, |
| [BPF_ALU | BPF_MOD | BPF_K] = true, |
| [BPF_ALU | BPF_MOD | BPF_X] = true, |
| [BPF_ALU | BPF_AND | BPF_K] = true, |
| [BPF_ALU | BPF_AND | BPF_X] = true, |
| [BPF_ALU | BPF_OR | BPF_K] = true, |
| [BPF_ALU | BPF_OR | BPF_X] = true, |
| [BPF_ALU | BPF_XOR | BPF_K] = true, |
| [BPF_ALU | BPF_XOR | BPF_X] = true, |
| [BPF_ALU | BPF_LSH | BPF_K] = true, |
| [BPF_ALU | BPF_LSH | BPF_X] = true, |
| [BPF_ALU | BPF_RSH | BPF_K] = true, |
| [BPF_ALU | BPF_RSH | BPF_X] = true, |
| [BPF_ALU | BPF_NEG] = true, |
| /* Load instructions */ |
| [BPF_LD | BPF_W | BPF_ABS] = true, |
| [BPF_LD | BPF_H | BPF_ABS] = true, |
| [BPF_LD | BPF_B | BPF_ABS] = true, |
| [BPF_LD | BPF_W | BPF_LEN] = true, |
| [BPF_LD | BPF_W | BPF_IND] = true, |
| [BPF_LD | BPF_H | BPF_IND] = true, |
| [BPF_LD | BPF_B | BPF_IND] = true, |
| [BPF_LD | BPF_IMM] = true, |
| [BPF_LD | BPF_MEM] = true, |
| [BPF_LDX | BPF_W | BPF_LEN] = true, |
| [BPF_LDX | BPF_B | BPF_MSH] = true, |
| [BPF_LDX | BPF_IMM] = true, |
| [BPF_LDX | BPF_MEM] = true, |
| /* Store instructions */ |
| [BPF_ST] = true, |
| [BPF_STX] = true, |
| /* Misc instructions */ |
| [BPF_MISC | BPF_TAX] = true, |
| [BPF_MISC | BPF_TXA] = true, |
| /* Return instructions */ |
| [BPF_RET | BPF_K] = true, |
| [BPF_RET | BPF_A] = true, |
| /* Jump instructions */ |
| [BPF_JMP | BPF_JA] = true, |
| [BPF_JMP | BPF_JEQ | BPF_K] = true, |
| [BPF_JMP | BPF_JEQ | BPF_X] = true, |
| [BPF_JMP | BPF_JGE | BPF_K] = true, |
| [BPF_JMP | BPF_JGE | BPF_X] = true, |
| [BPF_JMP | BPF_JGT | BPF_K] = true, |
| [BPF_JMP | BPF_JGT | BPF_X] = true, |
| [BPF_JMP | BPF_JSET | BPF_K] = true, |
| [BPF_JMP | BPF_JSET | BPF_X] = true, |
| }; |
| |
| if (code_to_probe >= ARRAY_SIZE(codes)) |
| return false; |
| |
| return codes[code_to_probe]; |
| } |
| |
| static bool bpf_check_basics_ok(const struct sock_filter *filter, |
| unsigned int flen) |
| { |
| if (filter == NULL) |
| return false; |
| if (flen == 0 || flen > BPF_MAXINSNS) |
| return false; |
| |
| return true; |
| } |
| |
| /** |
| * bpf_check_classic - verify socket filter code |
| * @filter: filter to verify |
| * @flen: length of filter |
| * |
| * Check the user's filter code. If we let some ugly |
| * filter code slip through kaboom! The filter must contain |
| * no references or jumps that are out of range, no illegal |
| * instructions, and must end with a RET instruction. |
| * |
| * All jumps are forward as they are not signed. |
| * |
| * Returns 0 if the rule set is legal or -EINVAL if not. |
| */ |
| static int bpf_check_classic(const struct sock_filter *filter, |
| unsigned int flen) |
| { |
| bool anc_found; |
| int pc; |
| |
| /* Check the filter code now */ |
| for (pc = 0; pc < flen; pc++) { |
| const struct sock_filter *ftest = &filter[pc]; |
| |
| /* May we actually operate on this code? */ |
| if (!chk_code_allowed(ftest->code)) |
| return -EINVAL; |
| |
| /* Some instructions need special checks */ |
| switch (ftest->code) { |
| case BPF_ALU | BPF_DIV | BPF_K: |
| case BPF_ALU | BPF_MOD | BPF_K: |
| /* Check for division by zero */ |
| if (ftest->k == 0) |
| return -EINVAL; |
| break; |
| case BPF_ALU | BPF_LSH | BPF_K: |
| case BPF_ALU | BPF_RSH | BPF_K: |
| if (ftest->k >= 32) |
| return -EINVAL; |
| break; |
| case BPF_LD | BPF_MEM: |
| case BPF_LDX | BPF_MEM: |
| case BPF_ST: |
| case BPF_STX: |
| /* Check for invalid memory addresses */ |
| if (ftest->k >= BPF_MEMWORDS) |
| return -EINVAL; |
| break; |
| case BPF_JMP | BPF_JA: |
| /* Note, the large ftest->k might cause loops. |
| * Compare this with conditional jumps below, |
| * where offsets are limited. --ANK (981016) |
| */ |
| if (ftest->k >= (unsigned int)(flen - pc - 1)) |
| return -EINVAL; |
| break; |
| case BPF_JMP | BPF_JEQ | BPF_K: |
| case BPF_JMP | BPF_JEQ | BPF_X: |
| case BPF_JMP | BPF_JGE | BPF_K: |
| case BPF_JMP | BPF_JGE | BPF_X: |
| case BPF_JMP | BPF_JGT | BPF_K: |
| case BPF_JMP | BPF_JGT | BPF_X: |
| case BPF_JMP | BPF_JSET | BPF_K: |
| case BPF_JMP | BPF_JSET | BPF_X: |
| /* Both conditionals must be safe */ |
| if (pc + ftest->jt + 1 >= flen || |
| pc + ftest->jf + 1 >= flen) |
| return -EINVAL; |
| break; |
| case BPF_LD | BPF_W | BPF_ABS: |
| case BPF_LD | BPF_H | BPF_ABS: |
| case BPF_LD | BPF_B | BPF_ABS: |
| anc_found = false; |
| if (bpf_anc_helper(ftest) & BPF_ANC) |
| anc_found = true; |
| /* Ancillary operation unknown or unsupported */ |
| if (anc_found == false && ftest->k >= SKF_AD_OFF) |
| return -EINVAL; |
| } |
| } |
| |
| /* Last instruction must be a RET code */ |
| switch (filter[flen - 1].code) { |
| case BPF_RET | BPF_K: |
| case BPF_RET | BPF_A: |
| return check_load_and_stores(filter, flen); |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int bpf_prog_store_orig_filter(struct bpf_prog *fp, |
| const struct sock_fprog *fprog) |
| { |
| unsigned int fsize = bpf_classic_proglen(fprog); |
| struct sock_fprog_kern *fkprog; |
| |
| fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL); |
| if (!fp->orig_prog) |
| return -ENOMEM; |
| |
| fkprog = fp->orig_prog; |
| fkprog->len = fprog->len; |
| |
| fkprog->filter = kmemdup(fp->insns, fsize, |
| GFP_KERNEL | __GFP_NOWARN); |
| if (!fkprog->filter) { |
| kfree(fp->orig_prog); |
| return -ENOMEM; |
| } |
| |
| return 0; |
| } |
| |
| static void bpf_release_orig_filter(struct bpf_prog *fp) |
| { |
| struct sock_fprog_kern *fprog = fp->orig_prog; |
| |
| if (fprog) { |
| kfree(fprog->filter); |
| kfree(fprog); |
| } |
| } |
| |
| static void __bpf_prog_release(struct bpf_prog *prog) |
| { |
| if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) { |
| bpf_prog_put(prog); |
| } else { |
| bpf_release_orig_filter(prog); |
| bpf_prog_free(prog); |
| } |
| } |
| |
| static void __sk_filter_release(struct sk_filter *fp) |
| { |
| __bpf_prog_release(fp->prog); |
| kfree(fp); |
| } |
| |
| /** |
| * sk_filter_release_rcu - Release a socket filter by rcu_head |
| * @rcu: rcu_head that contains the sk_filter to free |
| */ |
| static void sk_filter_release_rcu(struct rcu_head *rcu) |
| { |
| struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu); |
| |
| __sk_filter_release(fp); |
| } |
| |
| /** |
| * sk_filter_release - release a socket filter |
| * @fp: filter to remove |
| * |
| * Remove a filter from a socket and release its resources. |
| */ |
| static void sk_filter_release(struct sk_filter *fp) |
| { |
| if (refcount_dec_and_test(&fp->refcnt)) |
| call_rcu(&fp->rcu, sk_filter_release_rcu); |
| } |
| |
| void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) |
| { |
| u32 filter_size = bpf_prog_size(fp->prog->len); |
| |
| atomic_sub(filter_size, &sk->sk_omem_alloc); |
| sk_filter_release(fp); |
| } |
| |
| /* try to charge the socket memory if there is space available |
| * return true on success |
| */ |
| static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
| { |
| u32 filter_size = bpf_prog_size(fp->prog->len); |
| |
| /* same check as in sock_kmalloc() */ |
| if (filter_size <= sysctl_optmem_max && |
| atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) { |
| atomic_add(filter_size, &sk->sk_omem_alloc); |
| return true; |
| } |
| return false; |
| } |
| |
| bool sk_filter_charge(struct sock *sk, struct sk_filter *fp) |
| { |
| if (!refcount_inc_not_zero(&fp->refcnt)) |
| return false; |
| |
| if (!__sk_filter_charge(sk, fp)) { |
| sk_filter_release(fp); |
| return false; |
| } |
| return true; |
| } |
| |
| static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp) |
| { |
| struct sock_filter *old_prog; |
| struct bpf_prog *old_fp; |
| int err, new_len, old_len = fp->len; |
| bool seen_ld_abs = false; |
| |
| /* We are free to overwrite insns et al right here as it |
| * won't be used at this point in time anymore internally |
| * after the migration to the internal BPF instruction |
| * representation. |
| */ |
| BUILD_BUG_ON(sizeof(struct sock_filter) != |
| sizeof(struct bpf_insn)); |
| |
| /* Conversion cannot happen on overlapping memory areas, |
| * so we need to keep the user BPF around until the 2nd |
| * pass. At this time, the user BPF is stored in fp->insns. |
| */ |
| old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter), |
| GFP_KERNEL | __GFP_NOWARN); |
| if (!old_prog) { |
| err = -ENOMEM; |
| goto out_err; |
| } |
| |
| /* 1st pass: calculate the new program length. */ |
| err = bpf_convert_filter(old_prog, old_len, NULL, &new_len, |
| &seen_ld_abs); |
| if (err) |
| goto out_err_free; |
| |
| /* Expand fp for appending the new filter representation. */ |
| old_fp = fp; |
| fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0); |
| if (!fp) { |
| /* The old_fp is still around in case we couldn't |
| * allocate new memory, so uncharge on that one. |
| */ |
| fp = old_fp; |
| err = -ENOMEM; |
| goto out_err_free; |
| } |
| |
| fp->len = new_len; |
| |
| /* 2nd pass: remap sock_filter insns into bpf_insn insns. */ |
| err = bpf_convert_filter(old_prog, old_len, fp, &new_len, |
| &seen_ld_abs); |
| if (err) |
| /* 2nd bpf_convert_filter() can fail only if it fails |
| * to allocate memory, remapping must succeed. Note, |
| * that at this time old_fp has already been released |
| * by krealloc(). |
| */ |
| goto out_err_free; |
| |
| fp = bpf_prog_select_runtime(fp, &err); |
| if (err) |
| goto out_err_free; |
| |
| kfree(old_prog); |
| return fp; |
| |
| out_err_free: |
| kfree(old_prog); |
| out_err: |
| __bpf_prog_release(fp); |
| return ERR_PTR(err); |
| } |
| |
| static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp, |
| bpf_aux_classic_check_t trans) |
| { |
| int err; |
| |
| fp->bpf_func = NULL; |
| fp->jited = 0; |
| |
| err = bpf_check_classic(fp->insns, fp->len); |
| if (err) { |
| __bpf_prog_release(fp); |
| return ERR_PTR(err); |
| } |
| |
| /* There might be additional checks and transformations |
| * needed on classic filters, f.e. in case of seccomp. |
| */ |
| if (trans) { |
| err = trans(fp->insns, fp->len); |
| if (err) { |
| __bpf_prog_release(fp); |
| return ERR_PTR(err); |
| } |
| } |
| |
| /* Probe if we can JIT compile the filter and if so, do |
| * the compilation of the filter. |
| */ |
| bpf_jit_compile(fp); |
| |
| /* JIT compiler couldn't process this filter, so do the |
| * internal BPF translation for the optimized interpreter. |
| */ |
| if (!fp->jited) |
| fp = bpf_migrate_filter(fp); |
| |
| return fp; |
| } |
| |
| /** |
| * bpf_prog_create - create an unattached filter |
| * @pfp: the unattached filter that is created |
| * @fprog: the filter program |
| * |
| * Create a filter independent of any socket. We first run some |
| * sanity checks on it to make sure it does not explode on us later. |
| * If an error occurs or there is insufficient memory for the filter |
| * a negative errno code is returned. On success the return is zero. |
| */ |
| int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog) |
| { |
| unsigned int fsize = bpf_classic_proglen(fprog); |
| struct bpf_prog *fp; |
| |
| /* Make sure new filter is there and in the right amounts. */ |
| if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
| return -EINVAL; |
| |
| fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
| if (!fp) |
| return -ENOMEM; |
| |
| memcpy(fp->insns, fprog->filter, fsize); |
| |
| fp->len = fprog->len; |
| /* Since unattached filters are not copied back to user |
| * space through sk_get_filter(), we do not need to hold |
| * a copy here, and can spare us the work. |
| */ |
| fp->orig_prog = NULL; |
| |
| /* bpf_prepare_filter() already takes care of freeing |
| * memory in case something goes wrong. |
| */ |
| fp = bpf_prepare_filter(fp, NULL); |
| if (IS_ERR(fp)) |
| return PTR_ERR(fp); |
| |
| *pfp = fp; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(bpf_prog_create); |
| |
| /** |
| * bpf_prog_create_from_user - create an unattached filter from user buffer |
| * @pfp: the unattached filter that is created |
| * @fprog: the filter program |
| * @trans: post-classic verifier transformation handler |
| * @save_orig: save classic BPF program |
| * |
| * This function effectively does the same as bpf_prog_create(), only |
| * that it builds up its insns buffer from user space provided buffer. |
| * It also allows for passing a bpf_aux_classic_check_t handler. |
| */ |
| int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, |
| bpf_aux_classic_check_t trans, bool save_orig) |
| { |
| unsigned int fsize = bpf_classic_proglen(fprog); |
| struct bpf_prog *fp; |
| int err; |
| |
| /* Make sure new filter is there and in the right amounts. */ |
| if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
| return -EINVAL; |
| |
| fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
| if (!fp) |
| return -ENOMEM; |
| |
| if (copy_from_user(fp->insns, fprog->filter, fsize)) { |
| __bpf_prog_free(fp); |
| return -EFAULT; |
| } |
| |
| fp->len = fprog->len; |
| fp->orig_prog = NULL; |
| |
| if (save_orig) { |
| err = bpf_prog_store_orig_filter(fp, fprog); |
| if (err) { |
| __bpf_prog_free(fp); |
| return -ENOMEM; |
| } |
| } |
| |
| /* bpf_prepare_filter() already takes care of freeing |
| * memory in case something goes wrong. |
| */ |
| fp = bpf_prepare_filter(fp, trans); |
| if (IS_ERR(fp)) |
| return PTR_ERR(fp); |
| |
| *pfp = fp; |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(bpf_prog_create_from_user); |
| |
| void bpf_prog_destroy(struct bpf_prog *fp) |
| { |
| __bpf_prog_release(fp); |
| } |
| EXPORT_SYMBOL_GPL(bpf_prog_destroy); |
| |
| static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk) |
| { |
| struct sk_filter *fp, *old_fp; |
| |
| fp = kmalloc(sizeof(*fp), GFP_KERNEL); |
| if (!fp) |
| return -ENOMEM; |
| |
| fp->prog = prog; |
| |
| if (!__sk_filter_charge(sk, fp)) { |
| kfree(fp); |
| return -ENOMEM; |
| } |
| refcount_set(&fp->refcnt, 1); |
| |
| old_fp = rcu_dereference_protected(sk->sk_filter, |
| lockdep_sock_is_held(sk)); |
| rcu_assign_pointer(sk->sk_filter, fp); |
| |
| if (old_fp) |
| sk_filter_uncharge(sk, old_fp); |
| |
| return 0; |
| } |
| |
| static |
| struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk) |
| { |
| unsigned int fsize = bpf_classic_proglen(fprog); |
| struct bpf_prog *prog; |
| int err; |
| |
| if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
| return ERR_PTR(-EPERM); |
| |
| /* Make sure new filter is there and in the right amounts. */ |
| if (!bpf_check_basics_ok(fprog->filter, fprog->len)) |
| return ERR_PTR(-EINVAL); |
| |
| prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0); |
| if (!prog) |
| return ERR_PTR(-ENOMEM); |
| |
| if (copy_from_user(prog->insns, fprog->filter, fsize)) { |
| __bpf_prog_free(prog); |
| return ERR_PTR(-EFAULT); |
| } |
| |
| prog->len = fprog->len; |
| |
| err = bpf_prog_store_orig_filter(prog, fprog); |
| if (err) { |
| __bpf_prog_free(prog); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| /* bpf_prepare_filter() already takes care of freeing |
| * memory in case something goes wrong. |
| */ |
| return bpf_prepare_filter(prog, NULL); |
| } |
| |
| /** |
| * sk_attach_filter - attach a socket filter |
| * @fprog: the filter program |
| * @sk: the socket to use |
| * |
| * Attach the user's filter code. We first run some sanity checks on |
| * it to make sure it does not explode on us later. If an error |
| * occurs or there is insufficient memory for the filter a negative |
| * errno code is returned. On success the return is zero. |
| */ |
| int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
| { |
| struct bpf_prog *prog = __get_filter(fprog, sk); |
| int err; |
| |
| if (IS_ERR(prog)) |
| return PTR_ERR(prog); |
| |
| err = __sk_attach_prog(prog, sk); |
| if (err < 0) { |
| __bpf_prog_release(prog); |
| return err; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(sk_attach_filter); |
| |
| int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk) |
| { |
| struct bpf_prog *prog = __get_filter(fprog, sk); |
| int err; |
| |
| if (IS_ERR(prog)) |
| return PTR_ERR(prog); |
| |
| if (bpf_prog_size(prog->len) > sysctl_optmem_max) |
| err = -ENOMEM; |
| else |
| err = reuseport_attach_prog(sk, prog); |
| |
| if (err) |
| __bpf_prog_release(prog); |
| |
| return err; |
| } |
| |
| static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk) |
| { |
| if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
| return ERR_PTR(-EPERM); |
| |
| return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); |
| } |
| |
| int sk_attach_bpf(u32 ufd, struct sock *sk) |
| { |
| struct bpf_prog *prog = __get_bpf(ufd, sk); |
| int err; |
| |
| if (IS_ERR(prog)) |
| return PTR_ERR(prog); |
| |
| err = __sk_attach_prog(prog, sk); |
| if (err < 0) { |
| bpf_prog_put(prog); |
| return err; |
| } |
| |
| return 0; |
| } |
| |
| int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk) |
| { |
| struct bpf_prog *prog; |
| int err; |
| |
| if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
| return -EPERM; |
| |
| prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER); |
| if (PTR_ERR(prog) == -EINVAL) |
| prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT); |
| if (IS_ERR(prog)) |
| return PTR_ERR(prog); |
| |
| if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) { |
| /* Like other non BPF_PROG_TYPE_SOCKET_FILTER |
| * bpf prog (e.g. sockmap). It depends on the |
| * limitation imposed by bpf_prog_load(). |
| * Hence, sysctl_optmem_max is not checked. |
| */ |
| if ((sk->sk_type != SOCK_STREAM && |
| sk->sk_type != SOCK_DGRAM) || |
| (sk->sk_protocol != IPPROTO_UDP && |
| sk->sk_protocol != IPPROTO_TCP) || |
| (sk->sk_family != AF_INET && |
| sk->sk_family != AF_INET6)) { |
| err = -ENOTSUPP; |
| goto err_prog_put; |
| } |
| } else { |
| /* BPF_PROG_TYPE_SOCKET_FILTER */ |
| if (bpf_prog_size(prog->len) > sysctl_optmem_max) { |
| err = -ENOMEM; |
| goto err_prog_put; |
| } |
| } |
| |
| err = reuseport_attach_prog(sk, prog); |
| err_prog_put: |
| if (err) |
| bpf_prog_put(prog); |
| |
| return err; |
| } |
| |
| void sk_reuseport_prog_free(struct bpf_prog *prog) |
| { |
| if (!prog) |
| return; |
| |
| if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) |
| bpf_prog_put(prog); |
| else |
| bpf_prog_destroy(prog); |
| } |
| |
| struct bpf_scratchpad { |
| union { |
| __be32 diff[MAX_BPF_STACK / sizeof(__be32)]; |
| u8 buff[MAX_BPF_STACK]; |
| }; |
| }; |
| |
| static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp); |
| |
| static inline int __bpf_try_make_writable(struct sk_buff *skb, |
| unsigned int write_len) |
| { |
| return skb_ensure_writable(skb, write_len); |
| } |
| |
| static inline int bpf_try_make_writable(struct sk_buff *skb, |
| unsigned int write_len) |
| { |
| int err = __bpf_try_make_writable(skb, write_len); |
| |
| bpf_compute_data_pointers(skb); |
| return err; |
| } |
| |
| static int bpf_try_make_head_writable(struct sk_buff *skb) |
| { |
| return bpf_try_make_writable(skb, skb_headlen(skb)); |
| } |
| |
| static inline void bpf_push_mac_rcsum(struct sk_buff *skb) |
| { |
| if (skb_at_tc_ingress(skb)) |
| skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len); |
| } |
| |
| static inline void bpf_pull_mac_rcsum(struct sk_buff *skb) |
| { |
| if (skb_at_tc_ingress(skb)) |
| skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len); |
| } |
| |
| BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset, |
| const void *, from, u32, len, u64, flags) |
| { |
| void *ptr; |
| |
| if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH))) |
| return -EINVAL; |
| if (unlikely(offset > 0xffff)) |
| return -EFAULT; |
| if (unlikely(bpf_try_make_writable(skb, offset + len))) |
| return -EFAULT; |
| |
| ptr = skb->data + offset; |
| if (flags & BPF_F_RECOMPUTE_CSUM) |
| __skb_postpull_rcsum(skb, ptr, len, offset); |
| |
| memcpy(ptr, from, len); |
| |
| if (flags & BPF_F_RECOMPUTE_CSUM) |
| __skb_postpush_rcsum(skb, ptr, len, offset); |
| if (flags & BPF_F_INVALIDATE_HASH) |
| skb_clear_hash(skb); |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_store_bytes_proto = { |
| .func = bpf_skb_store_bytes, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_MEM, |
| .arg4_type = ARG_CONST_SIZE, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset, |
| void *, to, u32, len) |
| { |
| void *ptr; |
| |
| if (unlikely(offset > 0xffff)) |
| goto err_clear; |
| |
| ptr = skb_header_pointer(skb, offset, len, to); |
| if (unlikely(!ptr)) |
| goto err_clear; |
| if (ptr != to) |
| memcpy(to, ptr, len); |
| |
| return 0; |
| err_clear: |
| memset(to, 0, len); |
| return -EFAULT; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_load_bytes_proto = { |
| .func = bpf_skb_load_bytes, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg4_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_4(bpf_flow_dissector_load_bytes, |
| const struct bpf_flow_dissector *, ctx, u32, offset, |
| void *, to, u32, len) |
| { |
| void *ptr; |
| |
| if (unlikely(offset > 0xffff)) |
| goto err_clear; |
| |
| if (unlikely(!ctx->skb)) |
| goto err_clear; |
| |
| ptr = skb_header_pointer(ctx->skb, offset, len, to); |
| if (unlikely(!ptr)) |
| goto err_clear; |
| if (ptr != to) |
| memcpy(to, ptr, len); |
| |
| return 0; |
| err_clear: |
| memset(to, 0, len); |
| return -EFAULT; |
| } |
| |
| static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = { |
| .func = bpf_flow_dissector_load_bytes, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg4_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb, |
| u32, offset, void *, to, u32, len, u32, start_header) |
| { |
| u8 *end = skb_tail_pointer(skb); |
| u8 *start, *ptr; |
| |
| if (unlikely(offset > 0xffff)) |
| goto err_clear; |
| |
| switch (start_header) { |
| case BPF_HDR_START_MAC: |
| if (unlikely(!skb_mac_header_was_set(skb))) |
| goto err_clear; |
| start = skb_mac_header(skb); |
| break; |
| case BPF_HDR_START_NET: |
| start = skb_network_header(skb); |
| break; |
| default: |
| goto err_clear; |
| } |
| |
| ptr = start + offset; |
| |
| if (likely(ptr + len <= end)) { |
| memcpy(to, ptr, len); |
| return 0; |
| } |
| |
| err_clear: |
| memset(to, 0, len); |
| return -EFAULT; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = { |
| .func = bpf_skb_load_bytes_relative, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg4_type = ARG_CONST_SIZE, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len) |
| { |
| /* Idea is the following: should the needed direct read/write |
| * test fail during runtime, we can pull in more data and redo |
| * again, since implicitly, we invalidate previous checks here. |
| * |
| * Or, since we know how much we need to make read/writeable, |
| * this can be done once at the program beginning for direct |
| * access case. By this we overcome limitations of only current |
| * headroom being accessible. |
| */ |
| return bpf_try_make_writable(skb, len ? : skb_headlen(skb)); |
| } |
| |
| static const struct bpf_func_proto bpf_skb_pull_data_proto = { |
| .func = bpf_skb_pull_data, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk) |
| { |
| return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL; |
| } |
| |
| static const struct bpf_func_proto bpf_sk_fullsock_proto = { |
| .func = bpf_sk_fullsock, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_SOCKET_OR_NULL, |
| .arg1_type = ARG_PTR_TO_SOCK_COMMON, |
| }; |
| |
| static inline int sk_skb_try_make_writable(struct sk_buff *skb, |
| unsigned int write_len) |
| { |
| int err = __bpf_try_make_writable(skb, write_len); |
| |
| bpf_compute_data_end_sk_skb(skb); |
| return err; |
| } |
| |
| BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len) |
| { |
| /* Idea is the following: should the needed direct read/write |
| * test fail during runtime, we can pull in more data and redo |
| * again, since implicitly, we invalidate previous checks here. |
| * |
| * Or, since we know how much we need to make read/writeable, |
| * this can be done once at the program beginning for direct |
| * access case. By this we overcome limitations of only current |
| * headroom being accessible. |
| */ |
| return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb)); |
| } |
| |
| static const struct bpf_func_proto sk_skb_pull_data_proto = { |
| .func = sk_skb_pull_data, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset, |
| u64, from, u64, to, u64, flags) |
| { |
| __sum16 *ptr; |
| |
| if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK))) |
| return -EINVAL; |
| if (unlikely(offset > 0xffff || offset & 1)) |
| return -EFAULT; |
| if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
| return -EFAULT; |
| |
| ptr = (__sum16 *)(skb->data + offset); |
| switch (flags & BPF_F_HDR_FIELD_MASK) { |
| case 0: |
| if (unlikely(from != 0)) |
| return -EINVAL; |
| |
| csum_replace_by_diff(ptr, to); |
| break; |
| case 2: |
| csum_replace2(ptr, from, to); |
| break; |
| case 4: |
| csum_replace4(ptr, from, to); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_l3_csum_replace_proto = { |
| .func = bpf_l3_csum_replace, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset, |
| u64, from, u64, to, u64, flags) |
| { |
| bool is_pseudo = flags & BPF_F_PSEUDO_HDR; |
| bool is_mmzero = flags & BPF_F_MARK_MANGLED_0; |
| bool do_mforce = flags & BPF_F_MARK_ENFORCE; |
| __sum16 *ptr; |
| |
| if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE | |
| BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK))) |
| return -EINVAL; |
| if (unlikely(offset > 0xffff || offset & 1)) |
| return -EFAULT; |
| if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr)))) |
| return -EFAULT; |
| |
| ptr = (__sum16 *)(skb->data + offset); |
| if (is_mmzero && !do_mforce && !*ptr) |
| return 0; |
| |
| switch (flags & BPF_F_HDR_FIELD_MASK) { |
| case 0: |
| if (unlikely(from != 0)) |
| return -EINVAL; |
| |
| inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo); |
| break; |
| case 2: |
| inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo); |
| break; |
| case 4: |
| inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (is_mmzero && !*ptr) |
| *ptr = CSUM_MANGLED_0; |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_l4_csum_replace_proto = { |
| .func = bpf_l4_csum_replace, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size, |
| __be32 *, to, u32, to_size, __wsum, seed) |
| { |
| struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp); |
| u32 diff_size = from_size + to_size; |
| int i, j = 0; |
| |
| /* This is quite flexible, some examples: |
| * |
| * from_size == 0, to_size > 0, seed := csum --> pushing data |
| * from_size > 0, to_size == 0, seed := csum --> pulling data |
| * from_size > 0, to_size > 0, seed := 0 --> diffing data |
| * |
| * Even for diffing, from_size and to_size don't need to be equal. |
| */ |
| if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) || |
| diff_size > sizeof(sp->diff))) |
| return -EINVAL; |
| |
| for (i = 0; i < from_size / sizeof(__be32); i++, j++) |
| sp->diff[j] = ~from[i]; |
| for (i = 0; i < to_size / sizeof(__be32); i++, j++) |
| sp->diff[j] = to[i]; |
| |
| return csum_partial(sp->diff, diff_size, seed); |
| } |
| |
| static const struct bpf_func_proto bpf_csum_diff_proto = { |
| .func = bpf_csum_diff, |
| .gpl_only = false, |
| .pkt_access = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_MEM_OR_NULL, |
| .arg2_type = ARG_CONST_SIZE_OR_ZERO, |
| .arg3_type = ARG_PTR_TO_MEM_OR_NULL, |
| .arg4_type = ARG_CONST_SIZE_OR_ZERO, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum) |
| { |
| /* The interface is to be used in combination with bpf_csum_diff() |
| * for direct packet writes. csum rotation for alignment as well |
| * as emulating csum_sub() can be done from the eBPF program. |
| */ |
| if (skb->ip_summed == CHECKSUM_COMPLETE) |
| return (skb->csum = csum_add(skb->csum, csum)); |
| |
| return -ENOTSUPP; |
| } |
| |
| static const struct bpf_func_proto bpf_csum_update_proto = { |
| .func = bpf_csum_update, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level) |
| { |
| /* The interface is to be used in combination with bpf_skb_adjust_room() |
| * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET |
| * is passed as flags, for example. |
| */ |
| switch (level) { |
| case BPF_CSUM_LEVEL_INC: |
| __skb_incr_checksum_unnecessary(skb); |
| break; |
| case BPF_CSUM_LEVEL_DEC: |
| __skb_decr_checksum_unnecessary(skb); |
| break; |
| case BPF_CSUM_LEVEL_RESET: |
| __skb_reset_checksum_unnecessary(skb); |
| break; |
| case BPF_CSUM_LEVEL_QUERY: |
| return skb->ip_summed == CHECKSUM_UNNECESSARY ? |
| skb->csum_level : -EACCES; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_csum_level_proto = { |
| .func = bpf_csum_level, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb) |
| { |
| return dev_forward_skb(dev, skb); |
| } |
| |
| static inline int __bpf_rx_skb_no_mac(struct net_device *dev, |
| struct sk_buff *skb) |
| { |
| int ret = ____dev_forward_skb(dev, skb); |
| |
| if (likely(!ret)) { |
| skb->dev = dev; |
| ret = netif_rx(skb); |
| } |
| |
| return ret; |
| } |
| |
| static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb) |
| { |
| int ret; |
| |
| if (dev_xmit_recursion()) { |
| net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n"); |
| kfree_skb(skb); |
| return -ENETDOWN; |
| } |
| |
| skb->dev = dev; |
| skb->tstamp = 0; |
| |
| dev_xmit_recursion_inc(); |
| ret = dev_queue_xmit(skb); |
| dev_xmit_recursion_dec(); |
| |
| return ret; |
| } |
| |
| static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev, |
| u32 flags) |
| { |
| unsigned int mlen = skb_network_offset(skb); |
| |
| if (mlen) { |
| __skb_pull(skb, mlen); |
| |
| /* At ingress, the mac header has already been pulled once. |
| * At egress, skb_pospull_rcsum has to be done in case that |
| * the skb is originated from ingress (i.e. a forwarded skb) |
| * to ensure that rcsum starts at net header. |
| */ |
| if (!skb_at_tc_ingress(skb)) |
| skb_postpull_rcsum(skb, skb_mac_header(skb), mlen); |
| } |
| skb_pop_mac_header(skb); |
| skb_reset_mac_len(skb); |
| return flags & BPF_F_INGRESS ? |
| __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb); |
| } |
| |
| static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev, |
| u32 flags) |
| { |
| /* Verify that a link layer header is carried */ |
| if (unlikely(skb->mac_header >= skb->network_header)) { |
| kfree_skb(skb); |
| return -ERANGE; |
| } |
| |
| bpf_push_mac_rcsum(skb); |
| return flags & BPF_F_INGRESS ? |
| __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb); |
| } |
| |
| static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev, |
| u32 flags) |
| { |
| if (dev_is_mac_header_xmit(dev)) |
| return __bpf_redirect_common(skb, dev, flags); |
| else |
| return __bpf_redirect_no_mac(skb, dev, flags); |
| } |
| |
| BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags) |
| { |
| struct net_device *dev; |
| struct sk_buff *clone; |
| int ret; |
| |
| if (unlikely(flags & ~(BPF_F_INGRESS))) |
| return -EINVAL; |
| |
| dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex); |
| if (unlikely(!dev)) |
| return -EINVAL; |
| |
| clone = skb_clone(skb, GFP_ATOMIC); |
| if (unlikely(!clone)) |
| return -ENOMEM; |
| |
| /* For direct write, we need to keep the invariant that the skbs |
| * we're dealing with need to be uncloned. Should uncloning fail |
| * here, we need to free the just generated clone to unclone once |
| * again. |
| */ |
| ret = bpf_try_make_head_writable(skb); |
| if (unlikely(ret)) { |
| kfree_skb(clone); |
| return -ENOMEM; |
| } |
| |
| return __bpf_redirect(clone, dev, flags); |
| } |
| |
| static const struct bpf_func_proto bpf_clone_redirect_proto = { |
| .func = bpf_clone_redirect, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info); |
| EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info); |
| |
| BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags) |
| { |
| struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
| |
| if (unlikely(flags & ~(BPF_F_INGRESS))) |
| return TC_ACT_SHOT; |
| |
| ri->flags = flags; |
| ri->tgt_index = ifindex; |
| |
| return TC_ACT_REDIRECT; |
| } |
| |
| int skb_do_redirect(struct sk_buff *skb) |
| { |
| struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
| struct net_device *dev; |
| |
| dev = dev_get_by_index_rcu(dev_net(skb->dev), ri->tgt_index); |
| ri->tgt_index = 0; |
| if (unlikely(!dev)) { |
| kfree_skb(skb); |
| return -EINVAL; |
| } |
| |
| return __bpf_redirect(skb, dev, ri->flags); |
| } |
| |
| static const struct bpf_func_proto bpf_redirect_proto = { |
| .func = bpf_redirect, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_ANYTHING, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes) |
| { |
| msg->apply_bytes = bytes; |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_msg_apply_bytes_proto = { |
| .func = bpf_msg_apply_bytes, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes) |
| { |
| msg->cork_bytes = bytes; |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_msg_cork_bytes_proto = { |
| .func = bpf_msg_cork_bytes, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start, |
| u32, end, u64, flags) |
| { |
| u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start; |
| u32 first_sge, last_sge, i, shift, bytes_sg_total; |
| struct scatterlist *sge; |
| u8 *raw, *to, *from; |
| struct page *page; |
| |
| if (unlikely(flags || end <= start)) |
| return -EINVAL; |
| |
| /* First find the starting scatterlist element */ |
| i = msg->sg.start; |
| do { |
| offset += len; |
| len = sk_msg_elem(msg, i)->length; |
| if (start < offset + len) |
| break; |
| sk_msg_iter_var_next(i); |
| } while (i != msg->sg.end); |
| |
| if (unlikely(start >= offset + len)) |
| return -EINVAL; |
| |
| first_sge = i; |
| /* The start may point into the sg element so we need to also |
| * account for the headroom. |
| */ |
| bytes_sg_total = start - offset + bytes; |
| if (!test_bit(i, &msg->sg.copy) && bytes_sg_total <= len) |
| goto out; |
| |
| /* At this point we need to linearize multiple scatterlist |
| * elements or a single shared page. Either way we need to |
| * copy into a linear buffer exclusively owned by BPF. Then |
| * place the buffer in the scatterlist and fixup the original |
| * entries by removing the entries now in the linear buffer |
| * and shifting the remaining entries. For now we do not try |
| * to copy partial entries to avoid complexity of running out |
| * of sg_entry slots. The downside is reading a single byte |
| * will copy the entire sg entry. |
| */ |
| do { |
| copy += sk_msg_elem(msg, i)->length; |
| sk_msg_iter_var_next(i); |
| if (bytes_sg_total <= copy) |
| break; |
| } while (i != msg->sg.end); |
| last_sge = i; |
| |
| if (unlikely(bytes_sg_total > copy)) |
| return -EINVAL; |
| |
| page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, |
| get_order(copy)); |
| if (unlikely(!page)) |
| return -ENOMEM; |
| |
| raw = page_address(page); |
| i = first_sge; |
| do { |
| sge = sk_msg_elem(msg, i); |
| from = sg_virt(sge); |
| len = sge->length; |
| to = raw + poffset; |
| |
| memcpy(to, from, len); |
| poffset += len; |
| sge->length = 0; |
| put_page(sg_page(sge)); |
| |
| sk_msg_iter_var_next(i); |
| } while (i != last_sge); |
| |
| sg_set_page(&msg->sg.data[first_sge], page, copy, 0); |
| |
| /* To repair sg ring we need to shift entries. If we only |
| * had a single entry though we can just replace it and |
| * be done. Otherwise walk the ring and shift the entries. |
| */ |
| WARN_ON_ONCE(last_sge == first_sge); |
| shift = last_sge > first_sge ? |
| last_sge - first_sge - 1 : |
| NR_MSG_FRAG_IDS - first_sge + last_sge - 1; |
| if (!shift) |
| goto out; |
| |
| i = first_sge; |
| sk_msg_iter_var_next(i); |
| do { |
| u32 move_from; |
| |
| if (i + shift >= NR_MSG_FRAG_IDS) |
| move_from = i + shift - NR_MSG_FRAG_IDS; |
| else |
| move_from = i + shift; |
| if (move_from == msg->sg.end) |
| break; |
| |
| msg->sg.data[i] = msg->sg.data[move_from]; |
| msg->sg.data[move_from].length = 0; |
| msg->sg.data[move_from].page_link = 0; |
| msg->sg.data[move_from].offset = 0; |
| sk_msg_iter_var_next(i); |
| } while (1); |
| |
| msg->sg.end = msg->sg.end - shift > msg->sg.end ? |
| msg->sg.end - shift + NR_MSG_FRAG_IDS : |
| msg->sg.end - shift; |
| out: |
| msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset; |
| msg->data_end = msg->data + bytes; |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_msg_pull_data_proto = { |
| .func = bpf_msg_pull_data, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start, |
| u32, len, u64, flags) |
| { |
| struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge; |
| u32 new, i = 0, l = 0, space, copy = 0, offset = 0; |
| u8 *raw, *to, *from; |
| struct page *page; |
| |
| if (unlikely(flags)) |
| return -EINVAL; |
| |
| /* First find the starting scatterlist element */ |
| i = msg->sg.start; |
| do { |
| offset += l; |
| l = sk_msg_elem(msg, i)->length; |
| |
| if (start < offset + l) |
| break; |
| sk_msg_iter_var_next(i); |
| } while (i != msg->sg.end); |
| |
| if (start >= offset + l) |
| return -EINVAL; |
| |
| space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); |
| |
| /* If no space available will fallback to copy, we need at |
| * least one scatterlist elem available to push data into |
| * when start aligns to the beginning of an element or two |
| * when it falls inside an element. We handle the start equals |
| * offset case because its the common case for inserting a |
| * header. |
| */ |
| if (!space || (space == 1 && start != offset)) |
| copy = msg->sg.data[i].length; |
| |
| page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP, |
| get_order(copy + len)); |
| if (unlikely(!page)) |
| return -ENOMEM; |
| |
| if (copy) { |
| int front, back; |
| |
| raw = page_address(page); |
| |
| psge = sk_msg_elem(msg, i); |
| front = start - offset; |
| back = psge->length - front; |
| from = sg_virt(psge); |
| |
| if (front) |
| memcpy(raw, from, front); |
| |
| if (back) { |
| from += front; |
| to = raw + front + len; |
| |
| memcpy(to, from, back); |
| } |
| |
| put_page(sg_page(psge)); |
| } else if (start - offset) { |
| psge = sk_msg_elem(msg, i); |
| rsge = sk_msg_elem_cpy(msg, i); |
| |
| psge->length = start - offset; |
| rsge.length -= psge->length; |
| rsge.offset += start; |
| |
| sk_msg_iter_var_next(i); |
| sg_unmark_end(psge); |
| sg_unmark_end(&rsge); |
| sk_msg_iter_next(msg, end); |
| } |
| |
| /* Slot(s) to place newly allocated data */ |
| new = i; |
| |
| /* Shift one or two slots as needed */ |
| if (!copy) { |
| sge = sk_msg_elem_cpy(msg, i); |
| |
| sk_msg_iter_var_next(i); |
| sg_unmark_end(&sge); |
| sk_msg_iter_next(msg, end); |
| |
| nsge = sk_msg_elem_cpy(msg, i); |
| if (rsge.length) { |
| sk_msg_iter_var_next(i); |
| nnsge = sk_msg_elem_cpy(msg, i); |
| } |
| |
| while (i != msg->sg.end) { |
| msg->sg.data[i] = sge; |
| sge = nsge; |
| sk_msg_iter_var_next(i); |
| if (rsge.length) { |
| nsge = nnsge; |
| nnsge = sk_msg_elem_cpy(msg, i); |
| } else { |
| nsge = sk_msg_elem_cpy(msg, i); |
| } |
| } |
| } |
| |
| /* Place newly allocated data buffer */ |
| sk_mem_charge(msg->sk, len); |
| msg->sg.size += len; |
| __clear_bit(new, &msg->sg.copy); |
| sg_set_page(&msg->sg.data[new], page, len + copy, 0); |
| if (rsge.length) { |
| get_page(sg_page(&rsge)); |
| sk_msg_iter_var_next(new); |
| msg->sg.data[new] = rsge; |
| } |
| |
| sk_msg_compute_data_pointers(msg); |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_msg_push_data_proto = { |
| .func = bpf_msg_push_data, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| static void sk_msg_shift_left(struct sk_msg *msg, int i) |
| { |
| int prev; |
| |
| do { |
| prev = i; |
| sk_msg_iter_var_next(i); |
| msg->sg.data[prev] = msg->sg.data[i]; |
| } while (i != msg->sg.end); |
| |
| sk_msg_iter_prev(msg, end); |
| } |
| |
| static void sk_msg_shift_right(struct sk_msg *msg, int i) |
| { |
| struct scatterlist tmp, sge; |
| |
| sk_msg_iter_next(msg, end); |
| sge = sk_msg_elem_cpy(msg, i); |
| sk_msg_iter_var_next(i); |
| tmp = sk_msg_elem_cpy(msg, i); |
| |
| while (i != msg->sg.end) { |
| msg->sg.data[i] = sge; |
| sk_msg_iter_var_next(i); |
| sge = tmp; |
| tmp = sk_msg_elem_cpy(msg, i); |
| } |
| } |
| |
| BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start, |
| u32, len, u64, flags) |
| { |
| u32 i = 0, l = 0, space, offset = 0; |
| u64 last = start + len; |
| int pop; |
| |
| if (unlikely(flags)) |
| return -EINVAL; |
| |
| /* First find the starting scatterlist element */ |
| i = msg->sg.start; |
| do { |
| offset += l; |
| l = sk_msg_elem(msg, i)->length; |
| |
| if (start < offset + l) |
| break; |
| sk_msg_iter_var_next(i); |
| } while (i != msg->sg.end); |
| |
| /* Bounds checks: start and pop must be inside message */ |
| if (start >= offset + l || last >= msg->sg.size) |
| return -EINVAL; |
| |
| space = MAX_MSG_FRAGS - sk_msg_elem_used(msg); |
| |
| pop = len; |
| /* --------------| offset |
| * -| start |-------- len -------| |
| * |
| * |----- a ----|-------- pop -------|----- b ----| |
| * |______________________________________________| length |
| * |
| * |
| * a: region at front of scatter element to save |
| * b: region at back of scatter element to save when length > A + pop |
| * pop: region to pop from element, same as input 'pop' here will be |
| * decremented below per iteration. |
| * |
| * Two top-level cases to handle when start != offset, first B is non |
| * zero and second B is zero corresponding to when a pop includes more |
| * than one element. |
| * |
| * Then if B is non-zero AND there is no space allocate space and |
| * compact A, B regions into page. If there is space shift ring to |
| * the rigth free'ing the next element in ring to place B, leaving |
| * A untouched except to reduce length. |
| */ |
| if (start != offset) { |
| struct scatterlist *nsge, *sge = sk_msg_elem(msg, i); |
| int a = start; |
| int b = sge->length - pop - a; |
| |
| sk_msg_iter_var_next(i); |
| |
| if (pop < sge->length - a) { |
| if (space) { |
| sge->length = a; |
| sk_msg_shift_right(msg, i); |
| nsge = sk_msg_elem(msg, i); |
| get_page(sg_page(sge)); |
| sg_set_page(nsge, |
| sg_page(sge), |
| b, sge->offset + pop + a); |
| } else { |
| struct page *page, *orig; |
| u8 *to, *from; |
| |
| page = alloc_pages(__GFP_NOWARN | |
| __GFP_COMP | GFP_ATOMIC, |
| get_order(a + b)); |
| if (unlikely(!page)) |
| return -ENOMEM; |
| |
| sge->length = a; |
| orig = sg_page(sge); |
| from = sg_virt(sge); |
| to = page_address(page); |
| memcpy(to, from, a); |
| memcpy(to + a, from + a + pop, b); |
| sg_set_page(sge, page, a + b, 0); |
| put_page(orig); |
| } |
| pop = 0; |
| } else if (pop >= sge->length - a) { |
| pop -= (sge->length - a); |
| sge->length = a; |
| } |
| } |
| |
| /* From above the current layout _must_ be as follows, |
| * |
| * -| offset |
| * -| start |
| * |
| * |---- pop ---|---------------- b ------------| |
| * |____________________________________________| length |
| * |
| * Offset and start of the current msg elem are equal because in the |
| * previous case we handled offset != start and either consumed the |
| * entire element and advanced to the next element OR pop == 0. |
| * |
| * Two cases to handle here are first pop is less than the length |
| * leaving some remainder b above. Simply adjust the element's layout |
| * in this case. Or pop >= length of the element so that b = 0. In this |
| * case advance to next element decrementing pop. |
| */ |
| while (pop) { |
| struct scatterlist *sge = sk_msg_elem(msg, i); |
| |
| if (pop < sge->length) { |
| sge->length -= pop; |
| sge->offset += pop; |
| pop = 0; |
| } else { |
| pop -= sge->length; |
| sk_msg_shift_left(msg, i); |
| } |
| sk_msg_iter_var_next(i); |
| } |
| |
| sk_mem_uncharge(msg->sk, len - pop); |
| msg->sg.size -= (len - pop); |
| sk_msg_compute_data_pointers(msg); |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_msg_pop_data_proto = { |
| .func = bpf_msg_pop_data, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| #ifdef CONFIG_CGROUP_NET_CLASSID |
| BPF_CALL_0(bpf_get_cgroup_classid_curr) |
| { |
| return __task_get_classid(current); |
| } |
| |
| static const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = { |
| .func = bpf_get_cgroup_classid_curr, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| }; |
| #endif |
| |
| BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb) |
| { |
| return task_get_classid(skb); |
| } |
| |
| static const struct bpf_func_proto bpf_get_cgroup_classid_proto = { |
| .func = bpf_get_cgroup_classid, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb) |
| { |
| return dst_tclassid(skb); |
| } |
| |
| static const struct bpf_func_proto bpf_get_route_realm_proto = { |
| .func = bpf_get_route_realm, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb) |
| { |
| /* If skb_clear_hash() was called due to mangling, we can |
| * trigger SW recalculation here. Later access to hash |
| * can then use the inline skb->hash via context directly |
| * instead of calling this helper again. |
| */ |
| return skb_get_hash(skb); |
| } |
| |
| static const struct bpf_func_proto bpf_get_hash_recalc_proto = { |
| .func = bpf_get_hash_recalc, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb) |
| { |
| /* After all direct packet write, this can be used once for |
| * triggering a lazy recalc on next skb_get_hash() invocation. |
| */ |
| skb_clear_hash(skb); |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_set_hash_invalid_proto = { |
| .func = bpf_set_hash_invalid, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash) |
| { |
| /* Set user specified hash as L4(+), so that it gets returned |
| * on skb_get_hash() call unless BPF prog later on triggers a |
| * skb_clear_hash(). |
| */ |
| __skb_set_sw_hash(skb, hash, true); |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_set_hash_proto = { |
| .func = bpf_set_hash, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto, |
| u16, vlan_tci) |
| { |
| int ret; |
| |
| if (unlikely(vlan_proto != htons(ETH_P_8021Q) && |
| vlan_proto != htons(ETH_P_8021AD))) |
| vlan_proto = htons(ETH_P_8021Q); |
| |
| bpf_push_mac_rcsum(skb); |
| ret = skb_vlan_push(skb, vlan_proto, vlan_tci); |
| bpf_pull_mac_rcsum(skb); |
| |
| bpf_compute_data_pointers(skb); |
| return ret; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_vlan_push_proto = { |
| .func = bpf_skb_vlan_push, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb) |
| { |
| int ret; |
| |
| bpf_push_mac_rcsum(skb); |
| ret = skb_vlan_pop(skb); |
| bpf_pull_mac_rcsum(skb); |
| |
| bpf_compute_data_pointers(skb); |
| return ret; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_vlan_pop_proto = { |
| .func = bpf_skb_vlan_pop, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len) |
| { |
| /* Caller already did skb_cow() with len as headroom, |
| * so no need to do it here. |
| */ |
| skb_push(skb, len); |
| memmove(skb->data, skb->data + len, off); |
| memset(skb->data + off, 0, len); |
| |
| /* No skb_postpush_rcsum(skb, skb->data + off, len) |
| * needed here as it does not change the skb->csum |
| * result for checksum complete when summing over |
| * zeroed blocks. |
| */ |
| return 0; |
| } |
| |
| static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len) |
| { |
| /* skb_ensure_writable() is not needed here, as we're |
| * already working on an uncloned skb. |
| */ |
| if (unlikely(!pskb_may_pull(skb, off + len))) |
| return -ENOMEM; |
| |
| skb_postpull_rcsum(skb, skb->data + off, len); |
| memmove(skb->data + len, skb->data, off); |
| __skb_pull(skb, len); |
| |
| return 0; |
| } |
| |
| static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len) |
| { |
| bool trans_same = skb->transport_header == skb->network_header; |
| int ret; |
| |
| /* There's no need for __skb_push()/__skb_pull() pair to |
| * get to the start of the mac header as we're guaranteed |
| * to always start from here under eBPF. |
| */ |
| ret = bpf_skb_generic_push(skb, off, len); |
| if (likely(!ret)) { |
| skb->mac_header -= len; |
| skb->network_header -= len; |
| if (trans_same) |
| skb->transport_header = skb->network_header; |
| } |
| |
| return ret; |
| } |
| |
| static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len) |
| { |
| bool trans_same = skb->transport_header == skb->network_header; |
| int ret; |
| |
| /* Same here, __skb_push()/__skb_pull() pair not needed. */ |
| ret = bpf_skb_generic_pop(skb, off, len); |
| if (likely(!ret)) { |
| skb->mac_header += len; |
| skb->network_header += len; |
| if (trans_same) |
| skb->transport_header = skb->network_header; |
| } |
| |
| return ret; |
| } |
| |
| static int bpf_skb_proto_4_to_6(struct sk_buff *skb) |
| { |
| const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); |
| u32 off = skb_mac_header_len(skb); |
| int ret; |
| |
| if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) |
| return -ENOTSUPP; |
| |
| ret = skb_cow(skb, len_diff); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| ret = bpf_skb_net_hdr_push(skb, off, len_diff); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| if (skb_is_gso(skb)) { |
| struct skb_shared_info *shinfo = skb_shinfo(skb); |
| |
| /* SKB_GSO_TCPV4 needs to be changed into |
| * SKB_GSO_TCPV6. |
| */ |
| if (shinfo->gso_type & SKB_GSO_TCPV4) { |
| shinfo->gso_type &= ~SKB_GSO_TCPV4; |
| shinfo->gso_type |= SKB_GSO_TCPV6; |
| } |
| |
| /* Due to IPv6 header, MSS needs to be downgraded. */ |
| skb_decrease_gso_size(shinfo, len_diff); |
| /* Header must be checked, and gso_segs recomputed. */ |
| shinfo->gso_type |= SKB_GSO_DODGY; |
| shinfo->gso_segs = 0; |
| } |
| |
| skb->protocol = htons(ETH_P_IPV6); |
| skb_clear_hash(skb); |
| |
| return 0; |
| } |
| |
| static int bpf_skb_proto_6_to_4(struct sk_buff *skb) |
| { |
| const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr); |
| u32 off = skb_mac_header_len(skb); |
| int ret; |
| |
| if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) |
| return -ENOTSUPP; |
| |
| ret = skb_unclone(skb, GFP_ATOMIC); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| ret = bpf_skb_net_hdr_pop(skb, off, len_diff); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| if (skb_is_gso(skb)) { |
| struct skb_shared_info *shinfo = skb_shinfo(skb); |
| |
| /* SKB_GSO_TCPV6 needs to be changed into |
| * SKB_GSO_TCPV4. |
| */ |
| if (shinfo->gso_type & SKB_GSO_TCPV6) { |
| shinfo->gso_type &= ~SKB_GSO_TCPV6; |
| shinfo->gso_type |= SKB_GSO_TCPV4; |
| } |
| |
| /* Due to IPv4 header, MSS can be upgraded. */ |
| skb_increase_gso_size(shinfo, len_diff); |
| /* Header must be checked, and gso_segs recomputed. */ |
| shinfo->gso_type |= SKB_GSO_DODGY; |
| shinfo->gso_segs = 0; |
| } |
| |
| skb->protocol = htons(ETH_P_IP); |
| skb_clear_hash(skb); |
| |
| return 0; |
| } |
| |
| static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto) |
| { |
| __be16 from_proto = skb->protocol; |
| |
| if (from_proto == htons(ETH_P_IP) && |
| to_proto == htons(ETH_P_IPV6)) |
| return bpf_skb_proto_4_to_6(skb); |
| |
| if (from_proto == htons(ETH_P_IPV6) && |
| to_proto == htons(ETH_P_IP)) |
| return bpf_skb_proto_6_to_4(skb); |
| |
| return -ENOTSUPP; |
| } |
| |
| BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto, |
| u64, flags) |
| { |
| int ret; |
| |
| if (unlikely(flags)) |
| return -EINVAL; |
| |
| /* General idea is that this helper does the basic groundwork |
| * needed for changing the protocol, and eBPF program fills the |
| * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace() |
| * and other helpers, rather than passing a raw buffer here. |
| * |
| * The rationale is to keep this minimal and without a need to |
| * deal with raw packet data. F.e. even if we would pass buffers |
| * here, the program still needs to call the bpf_lX_csum_replace() |
| * helpers anyway. Plus, this way we keep also separation of |
| * concerns, since f.e. bpf_skb_store_bytes() should only take |
| * care of stores. |
| * |
| * Currently, additional options and extension header space are |
| * not supported, but flags register is reserved so we can adapt |
| * that. For offloads, we mark packet as dodgy, so that headers |
| * need to be verified first. |
| */ |
| ret = bpf_skb_proto_xlat(skb, proto); |
| bpf_compute_data_pointers(skb); |
| return ret; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_change_proto_proto = { |
| .func = bpf_skb_change_proto, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type) |
| { |
| /* We only allow a restricted subset to be changed for now. */ |
| if (unlikely(!skb_pkt_type_ok(skb->pkt_type) || |
| !skb_pkt_type_ok(pkt_type))) |
| return -EINVAL; |
| |
| skb->pkt_type = pkt_type; |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_change_type_proto = { |
| .func = bpf_skb_change_type, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| static u32 bpf_skb_net_base_len(const struct sk_buff *skb) |
| { |
| switch (skb->protocol) { |
| case htons(ETH_P_IP): |
| return sizeof(struct iphdr); |
| case htons(ETH_P_IPV6): |
| return sizeof(struct ipv6hdr); |
| default: |
| return ~0U; |
| } |
| } |
| |
| #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \ |
| BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) |
| |
| #define BPF_F_ADJ_ROOM_MASK (BPF_F_ADJ_ROOM_FIXED_GSO | \ |
| BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \ |
| BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \ |
| BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \ |
| BPF_F_ADJ_ROOM_ENCAP_L2( \ |
| BPF_ADJ_ROOM_ENCAP_L2_MASK)) |
| |
| static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff, |
| u64 flags) |
| { |
| u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT; |
| bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK; |
| u16 mac_len = 0, inner_net = 0, inner_trans = 0; |
| unsigned int gso_type = SKB_GSO_DODGY; |
| int ret; |
| |
| if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { |
| /* udp gso_size delineates datagrams, only allow if fixed */ |
| if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || |
| !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) |
| return -ENOTSUPP; |
| } |
| |
| ret = skb_cow_head(skb, len_diff); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| if (encap) { |
| if (skb->protocol != htons(ETH_P_IP) && |
| skb->protocol != htons(ETH_P_IPV6)) |
| return -ENOTSUPP; |
| |
| if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 && |
| flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) |
| return -EINVAL; |
| |
| if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE && |
| flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) |
| return -EINVAL; |
| |
| if (skb->encapsulation) |
| return -EALREADY; |
| |
| mac_len = skb->network_header - skb->mac_header; |
| inner_net = skb->network_header; |
| if (inner_mac_len > len_diff) |
| return -EINVAL; |
| inner_trans = skb->transport_header; |
| } |
| |
| ret = bpf_skb_net_hdr_push(skb, off, len_diff); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| if (encap) { |
| skb->inner_mac_header = inner_net - inner_mac_len; |
| skb->inner_network_header = inner_net; |
| skb->inner_transport_header = inner_trans; |
| skb_set_inner_protocol(skb, skb->protocol); |
| |
| skb->encapsulation = 1; |
| skb_set_network_header(skb, mac_len); |
| |
| if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) |
| gso_type |= SKB_GSO_UDP_TUNNEL; |
| else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE) |
| gso_type |= SKB_GSO_GRE; |
| else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) |
| gso_type |= SKB_GSO_IPXIP6; |
| else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) |
| gso_type |= SKB_GSO_IPXIP4; |
| |
| if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE || |
| flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) { |
| int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ? |
| sizeof(struct ipv6hdr) : |
| sizeof(struct iphdr); |
| |
| skb_set_transport_header(skb, mac_len + nh_len); |
| } |
| |
| /* Match skb->protocol to new outer l3 protocol */ |
| if (skb->protocol == htons(ETH_P_IP) && |
| flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6) |
| skb->protocol = htons(ETH_P_IPV6); |
| else if (skb->protocol == htons(ETH_P_IPV6) && |
| flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4) |
| skb->protocol = htons(ETH_P_IP); |
| } |
| |
| if (skb_is_gso(skb)) { |
| struct skb_shared_info *shinfo = skb_shinfo(skb); |
| |
| /* Due to header grow, MSS needs to be downgraded. */ |
| if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) |
| skb_decrease_gso_size(shinfo, len_diff); |
| |
| /* Header must be checked, and gso_segs recomputed. */ |
| shinfo->gso_type |= gso_type; |
| shinfo->gso_segs = 0; |
| } |
| |
| return 0; |
| } |
| |
| static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff, |
| u64 flags) |
| { |
| int ret; |
| |
| if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO | |
| BPF_F_ADJ_ROOM_NO_CSUM_RESET))) |
| return -EINVAL; |
| |
| if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) { |
| /* udp gso_size delineates datagrams, only allow if fixed */ |
| if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) || |
| !(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) |
| return -ENOTSUPP; |
| } |
| |
| ret = skb_unclone(skb, GFP_ATOMIC); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| ret = bpf_skb_net_hdr_pop(skb, off, len_diff); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| if (skb_is_gso(skb)) { |
| struct skb_shared_info *shinfo = skb_shinfo(skb); |
| |
| /* Due to header shrink, MSS can be upgraded. */ |
| if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO)) |
| skb_increase_gso_size(shinfo, len_diff); |
| |
| /* Header must be checked, and gso_segs recomputed. */ |
| shinfo->gso_type |= SKB_GSO_DODGY; |
| shinfo->gso_segs = 0; |
| } |
| |
| return 0; |
| } |
| |
| static u32 __bpf_skb_max_len(const struct sk_buff *skb) |
| { |
| return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len : |
| SKB_MAX_ALLOC; |
| } |
| |
| BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff, |
| u32, mode, u64, flags) |
| { |
| u32 len_cur, len_diff_abs = abs(len_diff); |
| u32 len_min = bpf_skb_net_base_len(skb); |
| u32 len_max = __bpf_skb_max_len(skb); |
| __be16 proto = skb->protocol; |
| bool shrink = len_diff < 0; |
| u32 off; |
| int ret; |
| |
| if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK | |
| BPF_F_ADJ_ROOM_NO_CSUM_RESET))) |
| return -EINVAL; |
| if (unlikely(len_diff_abs > 0xfffU)) |
| return -EFAULT; |
| if (unlikely(proto != htons(ETH_P_IP) && |
| proto != htons(ETH_P_IPV6))) |
| return -ENOTSUPP; |
| |
| off = skb_mac_header_len(skb); |
| switch (mode) { |
| case BPF_ADJ_ROOM_NET: |
| off += bpf_skb_net_base_len(skb); |
| break; |
| case BPF_ADJ_ROOM_MAC: |
| break; |
| default: |
| return -ENOTSUPP; |
| } |
| |
| len_cur = skb->len - skb_network_offset(skb); |
| if ((shrink && (len_diff_abs >= len_cur || |
| len_cur - len_diff_abs < len_min)) || |
| (!shrink && (skb->len + len_diff_abs > len_max && |
| !skb_is_gso(skb)))) |
| return -ENOTSUPP; |
| |
| ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) : |
| bpf_skb_net_grow(skb, off, len_diff_abs, flags); |
| if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET)) |
| __skb_reset_checksum_unnecessary(skb); |
| |
| bpf_compute_data_pointers(skb); |
| return ret; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_adjust_room_proto = { |
| .func = bpf_skb_adjust_room, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| static u32 __bpf_skb_min_len(const struct sk_buff *skb) |
| { |
| u32 min_len = skb_network_offset(skb); |
| |
| if (skb_transport_header_was_set(skb)) |
| min_len = skb_transport_offset(skb); |
| if (skb->ip_summed == CHECKSUM_PARTIAL) |
| min_len = skb_checksum_start_offset(skb) + |
| skb->csum_offset + sizeof(__sum16); |
| return min_len; |
| } |
| |
| static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len) |
| { |
| unsigned int old_len = skb->len; |
| int ret; |
| |
| ret = __skb_grow_rcsum(skb, new_len); |
| if (!ret) |
| memset(skb->data + old_len, 0, new_len - old_len); |
| return ret; |
| } |
| |
| static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len) |
| { |
| return __skb_trim_rcsum(skb, new_len); |
| } |
| |
| static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len, |
| u64 flags) |
| { |
| u32 max_len = __bpf_skb_max_len(skb); |
| u32 min_len = __bpf_skb_min_len(skb); |
| int ret; |
| |
| if (unlikely(flags || new_len > max_len || new_len < min_len)) |
| return -EINVAL; |
| if (skb->encapsulation) |
| return -ENOTSUPP; |
| |
| /* The basic idea of this helper is that it's performing the |
| * needed work to either grow or trim an skb, and eBPF program |
| * rewrites the rest via helpers like bpf_skb_store_bytes(), |
| * bpf_lX_csum_replace() and others rather than passing a raw |
| * buffer here. This one is a slow path helper and intended |
| * for replies with control messages. |
| * |
| * Like in bpf_skb_change_proto(), we want to keep this rather |
| * minimal and without protocol specifics so that we are able |
| * to separate concerns as in bpf_skb_store_bytes() should only |
| * be the one responsible for writing buffers. |
| * |
| * It's really expected to be a slow path operation here for |
| * control message replies, so we're implicitly linearizing, |
| * uncloning and drop offloads from the skb by this. |
| */ |
| ret = __bpf_try_make_writable(skb, skb->len); |
| if (!ret) { |
| if (new_len > skb->len) |
| ret = bpf_skb_grow_rcsum(skb, new_len); |
| else if (new_len < skb->len) |
| ret = bpf_skb_trim_rcsum(skb, new_len); |
| if (!ret && skb_is_gso(skb)) |
| skb_gso_reset(skb); |
| } |
| return ret; |
| } |
| |
| BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len, |
| u64, flags) |
| { |
| int ret = __bpf_skb_change_tail(skb, new_len, flags); |
| |
| bpf_compute_data_pointers(skb); |
| return ret; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_change_tail_proto = { |
| .func = bpf_skb_change_tail, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len, |
| u64, flags) |
| { |
| int ret = __bpf_skb_change_tail(skb, new_len, flags); |
| |
| bpf_compute_data_end_sk_skb(skb); |
| return ret; |
| } |
| |
| static const struct bpf_func_proto sk_skb_change_tail_proto = { |
| .func = sk_skb_change_tail, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room, |
| u64 flags) |
| { |
| u32 max_len = __bpf_skb_max_len(skb); |
| u32 new_len = skb->len + head_room; |
| int ret; |
| |
| if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) || |
| new_len < skb->len)) |
| return -EINVAL; |
| |
| ret = skb_cow(skb, head_room); |
| if (likely(!ret)) { |
| /* Idea for this helper is that we currently only |
| * allow to expand on mac header. This means that |
| * skb->protocol network header, etc, stay as is. |
| * Compared to bpf_skb_change_tail(), we're more |
| * flexible due to not needing to linearize or |
| * reset GSO. Intention for this helper is to be |
| * used by an L3 skb that needs to push mac header |
| * for redirection into L2 device. |
| */ |
| __skb_push(skb, head_room); |
| memset(skb->data, 0, head_room); |
| skb_reset_mac_header(skb); |
| } |
| |
| return ret; |
| } |
| |
| BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room, |
| u64, flags) |
| { |
| int ret = __bpf_skb_change_head(skb, head_room, flags); |
| |
| bpf_compute_data_pointers(skb); |
| return ret; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_change_head_proto = { |
| .func = bpf_skb_change_head, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room, |
| u64, flags) |
| { |
| int ret = __bpf_skb_change_head(skb, head_room, flags); |
| |
| bpf_compute_data_end_sk_skb(skb); |
| return ret; |
| } |
| |
| static const struct bpf_func_proto sk_skb_change_head_proto = { |
| .func = sk_skb_change_head, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| static unsigned long xdp_get_metalen(const struct xdp_buff *xdp) |
| { |
| return xdp_data_meta_unsupported(xdp) ? 0 : |
| xdp->data - xdp->data_meta; |
| } |
| |
| BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset) |
| { |
| void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); |
| unsigned long metalen = xdp_get_metalen(xdp); |
| void *data_start = xdp_frame_end + metalen; |
| void *data = xdp->data + offset; |
| |
| if (unlikely(data < data_start || |
| data > xdp->data_end - ETH_HLEN)) |
| return -EINVAL; |
| |
| if (metalen) |
| memmove(xdp->data_meta + offset, |
| xdp->data_meta, metalen); |
| xdp->data_meta += offset; |
| xdp->data = data; |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_adjust_head_proto = { |
| .func = bpf_xdp_adjust_head, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset) |
| { |
| void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */ |
| void *data_end = xdp->data_end + offset; |
| |
| /* Notice that xdp_data_hard_end have reserved some tailroom */ |
| if (unlikely(data_end > data_hard_end)) |
| return -EINVAL; |
| |
| /* ALL drivers MUST init xdp->frame_sz, chicken check below */ |
| if (unlikely(xdp->frame_sz > PAGE_SIZE)) { |
| WARN_ONCE(1, "Too BIG xdp->frame_sz = %d\n", xdp->frame_sz); |
| return -EINVAL; |
| } |
| |
| if (unlikely(data_end < xdp->data + ETH_HLEN)) |
| return -EINVAL; |
| |
| /* Clear memory area on grow, can contain uninit kernel memory */ |
| if (offset > 0) |
| memset(xdp->data_end, 0, offset); |
| |
| xdp->data_end = data_end; |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = { |
| .func = bpf_xdp_adjust_tail, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset) |
| { |
| void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame); |
| void *meta = xdp->data_meta + offset; |
| unsigned long metalen = xdp->data - meta; |
| |
| if (xdp_data_meta_unsupported(xdp)) |
| return -ENOTSUPP; |
| if (unlikely(meta < xdp_frame_end || |
| meta > xdp->data)) |
| return -EINVAL; |
| if (unlikely((metalen & (sizeof(__u32) - 1)) || |
| (metalen > 32))) |
| return -EACCES; |
| |
| xdp->data_meta = meta; |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = { |
| .func = bpf_xdp_adjust_meta, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd, |
| struct bpf_map *map, struct xdp_buff *xdp) |
| { |
| switch (map->map_type) { |
| case BPF_MAP_TYPE_DEVMAP: |
| case BPF_MAP_TYPE_DEVMAP_HASH: |
| return dev_map_enqueue(fwd, xdp, dev_rx); |
| case BPF_MAP_TYPE_CPUMAP: |
| return cpu_map_enqueue(fwd, xdp, dev_rx); |
| case BPF_MAP_TYPE_XSKMAP: |
| return __xsk_map_redirect(fwd, xdp); |
| default: |
| return -EBADRQC; |
| } |
| return 0; |
| } |
| |
| void xdp_do_flush(void) |
| { |
| __dev_flush(); |
| __cpu_map_flush(); |
| __xsk_map_flush(); |
| } |
| EXPORT_SYMBOL_GPL(xdp_do_flush); |
| |
| static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index) |
| { |
| switch (map->map_type) { |
| case BPF_MAP_TYPE_DEVMAP: |
| return __dev_map_lookup_elem(map, index); |
| case BPF_MAP_TYPE_DEVMAP_HASH: |
| return __dev_map_hash_lookup_elem(map, index); |
| case BPF_MAP_TYPE_CPUMAP: |
| return __cpu_map_lookup_elem(map, index); |
| case BPF_MAP_TYPE_XSKMAP: |
| return __xsk_map_lookup_elem(map, index); |
| default: |
| return NULL; |
| } |
| } |
| |
| void bpf_clear_redirect_map(struct bpf_map *map) |
| { |
| struct bpf_redirect_info *ri; |
| int cpu; |
| |
| for_each_possible_cpu(cpu) { |
| ri = per_cpu_ptr(&bpf_redirect_info, cpu); |
| /* Avoid polluting remote cacheline due to writes if |
| * not needed. Once we pass this test, we need the |
| * cmpxchg() to make sure it hasn't been changed in |
| * the meantime by remote CPU. |
| */ |
| if (unlikely(READ_ONCE(ri->map) == map)) |
| cmpxchg(&ri->map, map, NULL); |
| } |
| } |
| |
| int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, |
| struct bpf_prog *xdp_prog) |
| { |
| struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
| struct bpf_map *map = READ_ONCE(ri->map); |
| u32 index = ri->tgt_index; |
| void *fwd = ri->tgt_value; |
| int err; |
| |
| ri->tgt_index = 0; |
| ri->tgt_value = NULL; |
| WRITE_ONCE(ri->map, NULL); |
| |
| if (unlikely(!map)) { |
| fwd = dev_get_by_index_rcu(dev_net(dev), index); |
| if (unlikely(!fwd)) { |
| err = -EINVAL; |
| goto err; |
| } |
| |
| err = dev_xdp_enqueue(fwd, xdp, dev); |
| } else { |
| err = __bpf_tx_xdp_map(dev, fwd, map, xdp); |
| } |
| |
| if (unlikely(err)) |
| goto err; |
| |
| _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
| return 0; |
| err: |
| _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(xdp_do_redirect); |
| |
| static int xdp_do_generic_redirect_map(struct net_device *dev, |
| struct sk_buff *skb, |
| struct xdp_buff *xdp, |
| struct bpf_prog *xdp_prog, |
| struct bpf_map *map) |
| { |
| struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
| u32 index = ri->tgt_index; |
| void *fwd = ri->tgt_value; |
| int err = 0; |
| |
| ri->tgt_index = 0; |
| ri->tgt_value = NULL; |
| WRITE_ONCE(ri->map, NULL); |
| |
| if (map->map_type == BPF_MAP_TYPE_DEVMAP || |
| map->map_type == BPF_MAP_TYPE_DEVMAP_HASH) { |
| struct bpf_dtab_netdev *dst = fwd; |
| |
| err = dev_map_generic_redirect(dst, skb, xdp_prog); |
| if (unlikely(err)) |
| goto err; |
| } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) { |
| struct xdp_sock *xs = fwd; |
| |
| err = xsk_generic_rcv(xs, xdp); |
| if (err) |
| goto err; |
| consume_skb(skb); |
| } else { |
| /* TODO: Handle BPF_MAP_TYPE_CPUMAP */ |
| err = -EBADRQC; |
| goto err; |
| } |
| |
| _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index); |
| return 0; |
| err: |
| _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err); |
| return err; |
| } |
| |
| int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb, |
| struct xdp_buff *xdp, struct bpf_prog *xdp_prog) |
| { |
| struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
| struct bpf_map *map = READ_ONCE(ri->map); |
| u32 index = ri->tgt_index; |
| struct net_device *fwd; |
| int err = 0; |
| |
| if (map) |
| return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog, |
| map); |
| ri->tgt_index = 0; |
| fwd = dev_get_by_index_rcu(dev_net(dev), index); |
| if (unlikely(!fwd)) { |
| err = -EINVAL; |
| goto err; |
| } |
| |
| err = xdp_ok_fwd_dev(fwd, skb->len); |
| if (unlikely(err)) |
| goto err; |
| |
| skb->dev = fwd; |
| _trace_xdp_redirect(dev, xdp_prog, index); |
| generic_xdp_tx(skb, xdp_prog); |
| return 0; |
| err: |
| _trace_xdp_redirect_err(dev, xdp_prog, index, err); |
| return err; |
| } |
| |
| BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags) |
| { |
| struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
| |
| if (unlikely(flags)) |
| return XDP_ABORTED; |
| |
| ri->flags = flags; |
| ri->tgt_index = ifindex; |
| ri->tgt_value = NULL; |
| WRITE_ONCE(ri->map, NULL); |
| |
| return XDP_REDIRECT; |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_redirect_proto = { |
| .func = bpf_xdp_redirect, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_ANYTHING, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex, |
| u64, flags) |
| { |
| struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); |
| |
| /* Lower bits of the flags are used as return code on lookup failure */ |
| if (unlikely(flags > XDP_TX)) |
| return XDP_ABORTED; |
| |
| ri->tgt_value = __xdp_map_lookup_elem(map, ifindex); |
| if (unlikely(!ri->tgt_value)) { |
| /* If the lookup fails we want to clear out the state in the |
| * redirect_info struct completely, so that if an eBPF program |
| * performs multiple lookups, the last one always takes |
| * precedence. |
| */ |
| WRITE_ONCE(ri->map, NULL); |
| return flags; |
| } |
| |
| ri->flags = flags; |
| ri->tgt_index = ifindex; |
| WRITE_ONCE(ri->map, map); |
| |
| return XDP_REDIRECT; |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_redirect_map_proto = { |
| .func = bpf_xdp_redirect_map, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_CONST_MAP_PTR, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| static unsigned long bpf_skb_copy(void *dst_buff, const void *skb, |
| unsigned long off, unsigned long len) |
| { |
| void *ptr = skb_header_pointer(skb, off, len, dst_buff); |
| |
| if (unlikely(!ptr)) |
| return len; |
| if (ptr != dst_buff) |
| memcpy(dst_buff, ptr, len); |
| |
| return 0; |
| } |
| |
| BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map, |
| u64, flags, void *, meta, u64, meta_size) |
| { |
| u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
| |
| if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) |
| return -EINVAL; |
| if (unlikely(!skb || skb_size > skb->len)) |
| return -EFAULT; |
| |
| return bpf_event_output(map, flags, meta, meta_size, skb, skb_size, |
| bpf_skb_copy); |
| } |
| |
| static const struct bpf_func_proto bpf_skb_event_output_proto = { |
| .func = bpf_skb_event_output, |
| .gpl_only = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_CONST_MAP_PTR, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_PTR_TO_MEM, |
| .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
| }; |
| |
| BTF_ID_LIST(bpf_skb_output_btf_ids) |
| BTF_ID(struct, sk_buff) |
| |
| const struct bpf_func_proto bpf_skb_output_proto = { |
| .func = bpf_skb_event_output, |
| .gpl_only = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_BTF_ID, |
| .arg2_type = ARG_CONST_MAP_PTR, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_PTR_TO_MEM, |
| .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
| .btf_id = bpf_skb_output_btf_ids, |
| }; |
| |
| static unsigned short bpf_tunnel_key_af(u64 flags) |
| { |
| return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET; |
| } |
| |
| BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to, |
| u32, size, u64, flags) |
| { |
| const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
| u8 compat[sizeof(struct bpf_tunnel_key)]; |
| void *to_orig = to; |
| int err; |
| |
| if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) { |
| err = -EINVAL; |
| goto err_clear; |
| } |
| if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) { |
| err = -EPROTO; |
| goto err_clear; |
| } |
| if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
| err = -EINVAL; |
| switch (size) { |
| case offsetof(struct bpf_tunnel_key, tunnel_label): |
| case offsetof(struct bpf_tunnel_key, tunnel_ext): |
| goto set_compat; |
| case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
| /* Fixup deprecated structure layouts here, so we have |
| * a common path later on. |
| */ |
| if (ip_tunnel_info_af(info) != AF_INET) |
| goto err_clear; |
| set_compat: |
| to = (struct bpf_tunnel_key *)compat; |
| break; |
| default: |
| goto err_clear; |
| } |
| } |
| |
| to->tunnel_id = be64_to_cpu(info->key.tun_id); |
| to->tunnel_tos = info->key.tos; |
| to->tunnel_ttl = info->key.ttl; |
| to->tunnel_ext = 0; |
| |
| if (flags & BPF_F_TUNINFO_IPV6) { |
| memcpy(to->remote_ipv6, &info->key.u.ipv6.src, |
| sizeof(to->remote_ipv6)); |
| to->tunnel_label = be32_to_cpu(info->key.label); |
| } else { |
| to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src); |
| memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); |
| to->tunnel_label = 0; |
| } |
| |
| if (unlikely(size != sizeof(struct bpf_tunnel_key))) |
| memcpy(to_orig, to, size); |
| |
| return 0; |
| err_clear: |
| memset(to_orig, 0, size); |
| return err; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = { |
| .func = bpf_skb_get_tunnel_key, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size) |
| { |
| const struct ip_tunnel_info *info = skb_tunnel_info(skb); |
| int err; |
| |
| if (unlikely(!info || |
| !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) { |
| err = -ENOENT; |
| goto err_clear; |
| } |
| if (unlikely(size < info->options_len)) { |
| err = -ENOMEM; |
| goto err_clear; |
| } |
| |
| ip_tunnel_info_opts_get(to, info); |
| if (size > info->options_len) |
| memset(to + info->options_len, 0, size - info->options_len); |
| |
| return info->options_len; |
| err_clear: |
| memset(to, 0, size); |
| return err; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = { |
| .func = bpf_skb_get_tunnel_opt, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| }; |
| |
| static struct metadata_dst __percpu *md_dst; |
| |
| BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb, |
| const struct bpf_tunnel_key *, from, u32, size, u64, flags) |
| { |
| struct metadata_dst *md = this_cpu_ptr(md_dst); |
| u8 compat[sizeof(struct bpf_tunnel_key)]; |
| struct ip_tunnel_info *info; |
| |
| if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX | |
| BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER))) |
| return -EINVAL; |
| if (unlikely(size != sizeof(struct bpf_tunnel_key))) { |
| switch (size) { |
| case offsetof(struct bpf_tunnel_key, tunnel_label): |
| case offsetof(struct bpf_tunnel_key, tunnel_ext): |
| case offsetof(struct bpf_tunnel_key, remote_ipv6[1]): |
| /* Fixup deprecated structure layouts here, so we have |
| * a common path later on. |
| */ |
| memcpy(compat, from, size); |
| memset(compat + size, 0, sizeof(compat) - size); |
| from = (const struct bpf_tunnel_key *) compat; |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) || |
| from->tunnel_ext)) |
| return -EINVAL; |
| |
| skb_dst_drop(skb); |
| dst_hold((struct dst_entry *) md); |
| skb_dst_set(skb, (struct dst_entry *) md); |
| |
| info = &md->u.tun_info; |
| memset(info, 0, sizeof(*info)); |
| info->mode = IP_TUNNEL_INFO_TX; |
| |
| info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE; |
| if (flags & BPF_F_DONT_FRAGMENT) |
| info->key.tun_flags |= TUNNEL_DONT_FRAGMENT; |
| if (flags & BPF_F_ZERO_CSUM_TX) |
| info->key.tun_flags &= ~TUNNEL_CSUM; |
| if (flags & BPF_F_SEQ_NUMBER) |
| info->key.tun_flags |= TUNNEL_SEQ; |
| |
| info->key.tun_id = cpu_to_be64(from->tunnel_id); |
| info->key.tos = from->tunnel_tos; |
| info->key.ttl = from->tunnel_ttl; |
| |
| if (flags & BPF_F_TUNINFO_IPV6) { |
| info->mode |= IP_TUNNEL_INFO_IPV6; |
| memcpy(&info->key.u.ipv6.dst, from->remote_ipv6, |
| sizeof(from->remote_ipv6)); |
| info->key.label = cpu_to_be32(from->tunnel_label) & |
| IPV6_FLOWLABEL_MASK; |
| } else { |
| info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4); |
| } |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = { |
| .func = bpf_skb_set_tunnel_key, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb, |
| const u8 *, from, u32, size) |
| { |
| struct ip_tunnel_info *info = skb_tunnel_info(skb); |
| const struct metadata_dst *md = this_cpu_ptr(md_dst); |
| |
| if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1)))) |
| return -EINVAL; |
| if (unlikely(size > IP_TUNNEL_OPTS_MAX)) |
| return -ENOMEM; |
| |
| ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT); |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = { |
| .func = bpf_skb_set_tunnel_opt, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| }; |
| |
| static const struct bpf_func_proto * |
| bpf_get_skb_set_tunnel_proto(enum bpf_func_id which) |
| { |
| if (!md_dst) { |
| struct metadata_dst __percpu *tmp; |
| |
| tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX, |
| METADATA_IP_TUNNEL, |
| GFP_KERNEL); |
| if (!tmp) |
| return NULL; |
| if (cmpxchg(&md_dst, NULL, tmp)) |
| metadata_dst_free_percpu(tmp); |
| } |
| |
| switch (which) { |
| case BPF_FUNC_skb_set_tunnel_key: |
| return &bpf_skb_set_tunnel_key_proto; |
| case BPF_FUNC_skb_set_tunnel_opt: |
| return &bpf_skb_set_tunnel_opt_proto; |
| default: |
| return NULL; |
| } |
| } |
| |
| BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map, |
| u32, idx) |
| { |
| struct bpf_array *array = container_of(map, struct bpf_array, map); |
| struct cgroup *cgrp; |
| struct sock *sk; |
| |
| sk = skb_to_full_sk(skb); |
| if (!sk || !sk_fullsock(sk)) |
| return -ENOENT; |
| if (unlikely(idx >= array->map.max_entries)) |
| return -E2BIG; |
| |
| cgrp = READ_ONCE(array->ptrs[idx]); |
| if (unlikely(!cgrp)) |
| return -EAGAIN; |
| |
| return sk_under_cgroup_hierarchy(sk, cgrp); |
| } |
| |
| static const struct bpf_func_proto bpf_skb_under_cgroup_proto = { |
| .func = bpf_skb_under_cgroup, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_CONST_MAP_PTR, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| #ifdef CONFIG_SOCK_CGROUP_DATA |
| static inline u64 __bpf_sk_cgroup_id(struct sock *sk) |
| { |
| struct cgroup *cgrp; |
| |
| cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); |
| return cgroup_id(cgrp); |
| } |
| |
| BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb) |
| { |
| struct sock *sk = skb_to_full_sk(skb); |
| |
| if (!sk || !sk_fullsock(sk)) |
| return 0; |
| |
| return __bpf_sk_cgroup_id(sk); |
| } |
| |
| static const struct bpf_func_proto bpf_skb_cgroup_id_proto = { |
| .func = bpf_skb_cgroup_id, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk, |
| int ancestor_level) |
| { |
| struct cgroup *ancestor; |
| struct cgroup *cgrp; |
| |
| cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data); |
| ancestor = cgroup_ancestor(cgrp, ancestor_level); |
| if (!ancestor) |
| return 0; |
| |
| return cgroup_id(ancestor); |
| } |
| |
| BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int, |
| ancestor_level) |
| { |
| struct sock *sk = skb_to_full_sk(skb); |
| |
| if (!sk || !sk_fullsock(sk)) |
| return 0; |
| |
| return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level); |
| } |
| |
| static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = { |
| .func = bpf_skb_ancestor_cgroup_id, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk) |
| { |
| return __bpf_sk_cgroup_id(sk); |
| } |
| |
| static const struct bpf_func_proto bpf_sk_cgroup_id_proto = { |
| .func = bpf_sk_cgroup_id, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_SOCKET, |
| }; |
| |
| BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level) |
| { |
| return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level); |
| } |
| |
| static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = { |
| .func = bpf_sk_ancestor_cgroup_id, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_SOCKET, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| #endif |
| |
| static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff, |
| unsigned long off, unsigned long len) |
| { |
| memcpy(dst_buff, src_buff + off, len); |
| return 0; |
| } |
| |
| BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map, |
| u64, flags, void *, meta, u64, meta_size) |
| { |
| u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32; |
| |
| if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK))) |
| return -EINVAL; |
| if (unlikely(!xdp || |
| xdp_size > (unsigned long)(xdp->data_end - xdp->data))) |
| return -EFAULT; |
| |
| return bpf_event_output(map, flags, meta, meta_size, xdp->data, |
| xdp_size, bpf_xdp_copy); |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_event_output_proto = { |
| .func = bpf_xdp_event_output, |
| .gpl_only = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_CONST_MAP_PTR, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_PTR_TO_MEM, |
| .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
| }; |
| |
| BTF_ID_LIST(bpf_xdp_output_btf_ids) |
| BTF_ID(struct, xdp_buff) |
| |
| const struct bpf_func_proto bpf_xdp_output_proto = { |
| .func = bpf_xdp_event_output, |
| .gpl_only = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_BTF_ID, |
| .arg2_type = ARG_CONST_MAP_PTR, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_PTR_TO_MEM, |
| .arg5_type = ARG_CONST_SIZE_OR_ZERO, |
| .btf_id = bpf_xdp_output_btf_ids, |
| }; |
| |
| BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb) |
| { |
| return skb->sk ? sock_gen_cookie(skb->sk) : 0; |
| } |
| |
| static const struct bpf_func_proto bpf_get_socket_cookie_proto = { |
| .func = bpf_get_socket_cookie, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) |
| { |
| return sock_gen_cookie(ctx->sk); |
| } |
| |
| static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = { |
| .func = bpf_get_socket_cookie_sock_addr, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx) |
| { |
| return sock_gen_cookie(ctx); |
| } |
| |
| static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = { |
| .func = bpf_get_socket_cookie_sock, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx) |
| { |
| return sock_gen_cookie(ctx->sk); |
| } |
| |
| static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = { |
| .func = bpf_get_socket_cookie_sock_ops, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| static u64 __bpf_get_netns_cookie(struct sock *sk) |
| { |
| #ifdef CONFIG_NET_NS |
| return net_gen_cookie(sk ? sk->sk_net.net : &init_net); |
| #else |
| return 0; |
| #endif |
| } |
| |
| BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx) |
| { |
| return __bpf_get_netns_cookie(ctx); |
| } |
| |
| static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = { |
| .func = bpf_get_netns_cookie_sock, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX_OR_NULL, |
| }; |
| |
| BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx) |
| { |
| return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL); |
| } |
| |
| static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = { |
| .func = bpf_get_netns_cookie_sock_addr, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX_OR_NULL, |
| }; |
| |
| BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb) |
| { |
| struct sock *sk = sk_to_full_sk(skb->sk); |
| kuid_t kuid; |
| |
| if (!sk || !sk_fullsock(sk)) |
| return overflowuid; |
| kuid = sock_net_uid(sock_net(sk), sk); |
| return from_kuid_munged(sock_net(sk)->user_ns, kuid); |
| } |
| |
| static const struct bpf_func_proto bpf_get_socket_uid_proto = { |
| .func = bpf_get_socket_uid, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| #define SOCKOPT_CC_REINIT (1 << 0) |
| |
| static int _bpf_setsockopt(struct sock *sk, int level, int optname, |
| char *optval, int optlen, u32 flags) |
| { |
| char devname[IFNAMSIZ]; |
| int val, valbool; |
| struct net *net; |
| int ifindex; |
| int ret = 0; |
| |
| if (!sk_fullsock(sk)) |
| return -EINVAL; |
| |
| sock_owned_by_me(sk); |
| |
| if (level == SOL_SOCKET) { |
| if (optlen != sizeof(int) && optname != SO_BINDTODEVICE) |
| return -EINVAL; |
| val = *((int *)optval); |
| valbool = val ? 1 : 0; |
| |
| /* Only some socketops are supported */ |
| switch (optname) { |
| case SO_RCVBUF: |
| val = min_t(u32, val, sysctl_rmem_max); |
| sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| WRITE_ONCE(sk->sk_rcvbuf, |
| max_t(int, val * 2, SOCK_MIN_RCVBUF)); |
| break; |
| case SO_SNDBUF: |
| val = min_t(u32, val, sysctl_wmem_max); |
| sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| WRITE_ONCE(sk->sk_sndbuf, |
| max_t(int, val * 2, SOCK_MIN_SNDBUF)); |
| break; |
| case SO_MAX_PACING_RATE: /* 32bit version */ |
| if (val != ~0U) |
| cmpxchg(&sk->sk_pacing_status, |
| SK_PACING_NONE, |
| SK_PACING_NEEDED); |
| sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val; |
| sk->sk_pacing_rate = min(sk->sk_pacing_rate, |
| sk->sk_max_pacing_rate); |
| break; |
| case SO_PRIORITY: |
| sk->sk_priority = val; |
| break; |
| case SO_RCVLOWAT: |
| if (val < 0) |
| val = INT_MAX; |
| WRITE_ONCE(sk->sk_rcvlowat, val ? : 1); |
| break; |
| case SO_MARK: |
| if (sk->sk_mark != val) { |
| sk->sk_mark = val; |
| sk_dst_reset(sk); |
| } |
| break; |
| case SO_BINDTODEVICE: |
| optlen = min_t(long, optlen, IFNAMSIZ - 1); |
| strncpy(devname, optval, optlen); |
| devname[optlen] = 0; |
| |
| ifindex = 0; |
| if (devname[0] != '\0') { |
| struct net_device *dev; |
| |
| ret = -ENODEV; |
| |
| net = sock_net(sk); |
| dev = dev_get_by_name(net, devname); |
| if (!dev) |
| break; |
| ifindex = dev->ifindex; |
| dev_put(dev); |
| } |
| ret = sock_bindtoindex(sk, ifindex, false); |
| break; |
| case SO_KEEPALIVE: |
| if (sk->sk_prot->keepalive) |
| sk->sk_prot->keepalive(sk, valbool); |
| sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| #ifdef CONFIG_INET |
| } else if (level == SOL_IP) { |
| if (optlen != sizeof(int) || sk->sk_family != AF_INET) |
| return -EINVAL; |
| |
| val = *((int *)optval); |
| /* Only some options are supported */ |
| switch (optname) { |
| case IP_TOS: |
| if (val < -1 || val > 0xff) { |
| ret = -EINVAL; |
| } else { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| if (val == -1) |
| val = 0; |
| inet->tos = val; |
| } |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else if (level == SOL_IPV6) { |
| if (optlen != sizeof(int) || sk->sk_family != AF_INET6) |
| return -EINVAL; |
| |
| val = *((int *)optval); |
| /* Only some options are supported */ |
| switch (optname) { |
| case IPV6_TCLASS: |
| if (val < -1 || val > 0xff) { |
| ret = -EINVAL; |
| } else { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| if (val == -1) |
| val = 0; |
| np->tclass = val; |
| } |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| #endif |
| } else if (level == SOL_TCP && |
| sk->sk_prot->setsockopt == tcp_setsockopt) { |
| if (optname == TCP_CONGESTION) { |
| char name[TCP_CA_NAME_MAX]; |
| bool reinit = flags & SOCKOPT_CC_REINIT; |
| |
| strncpy(name, optval, min_t(long, optlen, |
| TCP_CA_NAME_MAX-1)); |
| name[TCP_CA_NAME_MAX-1] = 0; |
| ret = tcp_set_congestion_control(sk, name, false, |
| reinit, true); |
| } else { |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| struct tcp_sock *tp = tcp_sk(sk); |
| |
| if (optlen != sizeof(int)) |
| return -EINVAL; |
| |
| val = *((int *)optval); |
| /* Only some options are supported */ |
| switch (optname) { |
| case TCP_BPF_IW: |
| if (val <= 0 || tp->data_segs_out > tp->syn_data) |
| ret = -EINVAL; |
| else |
| tp->snd_cwnd = val; |
| break; |
| case TCP_BPF_SNDCWND_CLAMP: |
| if (val <= 0) { |
| ret = -EINVAL; |
| } else { |
| tp->snd_cwnd_clamp = val; |
| tp->snd_ssthresh = val; |
| } |
| break; |
| case TCP_SAVE_SYN: |
| if (val < 0 || val > 1) |
| ret = -EINVAL; |
| else |
| tp->save_syn = val; |
| break; |
| case TCP_KEEPIDLE: |
| ret = tcp_sock_set_keepidle_locked(sk, val); |
| break; |
| case TCP_KEEPINTVL: |
| if (val < 1 || val > MAX_TCP_KEEPINTVL) |
| ret = -EINVAL; |
| else |
| tp->keepalive_intvl = val * HZ; |
| break; |
| case TCP_KEEPCNT: |
| if (val < 1 || val > MAX_TCP_KEEPCNT) |
| ret = -EINVAL; |
| else |
| tp->keepalive_probes = val; |
| break; |
| case TCP_SYNCNT: |
| if (val < 1 || val > MAX_TCP_SYNCNT) |
| ret = -EINVAL; |
| else |
| icsk->icsk_syn_retries = val; |
| break; |
| case TCP_USER_TIMEOUT: |
| if (val < 0) |
| ret = -EINVAL; |
| else |
| icsk->icsk_user_timeout = val; |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| } |
| #endif |
| } else { |
| ret = -EINVAL; |
| } |
| return ret; |
| } |
| |
| static int _bpf_getsockopt(struct sock *sk, int level, int optname, |
| char *optval, int optlen) |
| { |
| if (!sk_fullsock(sk)) |
| goto err_clear; |
| |
| sock_owned_by_me(sk); |
| |
| #ifdef CONFIG_INET |
| if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) { |
| struct inet_connection_sock *icsk; |
| struct tcp_sock *tp; |
| |
| switch (optname) { |
| case TCP_CONGESTION: |
| icsk = inet_csk(sk); |
| |
| if (!icsk->icsk_ca_ops || optlen <= 1) |
| goto err_clear; |
| strncpy(optval, icsk->icsk_ca_ops->name, optlen); |
| optval[optlen - 1] = 0; |
| break; |
| case TCP_SAVED_SYN: |
| tp = tcp_sk(sk); |
| |
| if (optlen <= 0 || !tp->saved_syn || |
| optlen > tp->saved_syn[0]) |
| goto err_clear; |
| memcpy(optval, tp->saved_syn + 1, optlen); |
| break; |
| default: |
| goto err_clear; |
| } |
| } else if (level == SOL_IP) { |
| struct inet_sock *inet = inet_sk(sk); |
| |
| if (optlen != sizeof(int) || sk->sk_family != AF_INET) |
| goto err_clear; |
| |
| /* Only some options are supported */ |
| switch (optname) { |
| case IP_TOS: |
| *((int *)optval) = (int)inet->tos; |
| break; |
| default: |
| goto err_clear; |
| } |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else if (level == SOL_IPV6) { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| if (optlen != sizeof(int) || sk->sk_family != AF_INET6) |
| goto err_clear; |
| |
| /* Only some options are supported */ |
| switch (optname) { |
| case IPV6_TCLASS: |
| *((int *)optval) = (int)np->tclass; |
| break; |
| default: |
| goto err_clear; |
| } |
| #endif |
| } else { |
| goto err_clear; |
| } |
| return 0; |
| #endif |
| err_clear: |
| memset(optval, 0, optlen); |
| return -EINVAL; |
| } |
| |
| BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx, |
| int, level, int, optname, char *, optval, int, optlen) |
| { |
| u32 flags = 0; |
| return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen, |
| flags); |
| } |
| |
| static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = { |
| .func = bpf_sock_addr_setsockopt, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_PTR_TO_MEM, |
| .arg5_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx, |
| int, level, int, optname, char *, optval, int, optlen) |
| { |
| return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen); |
| } |
| |
| static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = { |
| .func = bpf_sock_addr_getsockopt, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg5_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
| int, level, int, optname, char *, optval, int, optlen) |
| { |
| u32 flags = 0; |
| if (bpf_sock->op > BPF_SOCK_OPS_NEEDS_ECN) |
| flags |= SOCKOPT_CC_REINIT; |
| return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen, |
| flags); |
| } |
| |
| static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = { |
| .func = bpf_sock_ops_setsockopt, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_PTR_TO_MEM, |
| .arg5_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock, |
| int, level, int, optname, char *, optval, int, optlen) |
| { |
| return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen); |
| } |
| |
| static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = { |
| .func = bpf_sock_ops_getsockopt, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| .arg4_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg5_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock, |
| int, argval) |
| { |
| struct sock *sk = bpf_sock->sk; |
| int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS; |
| |
| if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk)) |
| return -EINVAL; |
| |
| tcp_sk(sk)->bpf_sock_ops_cb_flags = val; |
| |
| return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS); |
| } |
| |
| static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = { |
| .func = bpf_sock_ops_cb_flags_set, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| }; |
| |
| const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly; |
| EXPORT_SYMBOL_GPL(ipv6_bpf_stub); |
| |
| BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr, |
| int, addr_len) |
| { |
| #ifdef CONFIG_INET |
| struct sock *sk = ctx->sk; |
| u32 flags = BIND_FROM_BPF; |
| int err; |
| |
| err = -EINVAL; |
| if (addr_len < offsetofend(struct sockaddr, sa_family)) |
| return err; |
| if (addr->sa_family == AF_INET) { |
| if (addr_len < sizeof(struct sockaddr_in)) |
| return err; |
| if (((struct sockaddr_in *)addr)->sin_port == htons(0)) |
| flags |= BIND_FORCE_ADDRESS_NO_PORT; |
| return __inet_bind(sk, addr, addr_len, flags); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else if (addr->sa_family == AF_INET6) { |
| if (addr_len < SIN6_LEN_RFC2133) |
| return err; |
| if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0)) |
| flags |= BIND_FORCE_ADDRESS_NO_PORT; |
| /* ipv6_bpf_stub cannot be NULL, since it's called from |
| * bpf_cgroup_inet6_connect hook and ipv6 is already loaded |
| */ |
| return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags); |
| #endif /* CONFIG_IPV6 */ |
| } |
| #endif /* CONFIG_INET */ |
| |
| return -EAFNOSUPPORT; |
| } |
| |
| static const struct bpf_func_proto bpf_bind_proto = { |
| .func = bpf_bind, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| }; |
| |
| #ifdef CONFIG_XFRM |
| BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index, |
| struct bpf_xfrm_state *, to, u32, size, u64, flags) |
| { |
| const struct sec_path *sp = skb_sec_path(skb); |
| const struct xfrm_state *x; |
| |
| if (!sp || unlikely(index >= sp->len || flags)) |
| goto err_clear; |
| |
| x = sp->xvec[index]; |
| |
| if (unlikely(size != sizeof(struct bpf_xfrm_state))) |
| goto err_clear; |
| |
| to->reqid = x->props.reqid; |
| to->spi = x->id.spi; |
| to->family = x->props.family; |
| to->ext = 0; |
| |
| if (to->family == AF_INET6) { |
| memcpy(to->remote_ipv6, x->props.saddr.a6, |
| sizeof(to->remote_ipv6)); |
| } else { |
| to->remote_ipv4 = x->props.saddr.a4; |
| memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3); |
| } |
| |
| return 0; |
| err_clear: |
| memset(to, 0, size); |
| return -EINVAL; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = { |
| .func = bpf_skb_get_xfrm_state, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg4_type = ARG_CONST_SIZE, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| #endif |
| |
| #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6) |
| static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params, |
| const struct neighbour *neigh, |
| const struct net_device *dev) |
| { |
| memcpy(params->dmac, neigh->ha, ETH_ALEN); |
| memcpy(params->smac, dev->dev_addr, ETH_ALEN); |
| params->h_vlan_TCI = 0; |
| params->h_vlan_proto = 0; |
| params->ifindex = dev->ifindex; |
| |
| return 0; |
| } |
| #endif |
| |
| #if IS_ENABLED(CONFIG_INET) |
| static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params, |
| u32 flags, bool check_mtu) |
| { |
| struct fib_nh_common *nhc; |
| struct in_device *in_dev; |
| struct neighbour *neigh; |
| struct net_device *dev; |
| struct fib_result res; |
| struct flowi4 fl4; |
| int err; |
| u32 mtu; |
| |
| dev = dev_get_by_index_rcu(net, params->ifindex); |
| if (unlikely(!dev)) |
| return -ENODEV; |
| |
| /* verify forwarding is enabled on this interface */ |
| in_dev = __in_dev_get_rcu(dev); |
| if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev))) |
| return BPF_FIB_LKUP_RET_FWD_DISABLED; |
| |
| if (flags & BPF_FIB_LOOKUP_OUTPUT) { |
| fl4.flowi4_iif = 1; |
| fl4.flowi4_oif = params->ifindex; |
| } else { |
| fl4.flowi4_iif = params->ifindex; |
| fl4.flowi4_oif = 0; |
| } |
| fl4.flowi4_tos = params->tos & IPTOS_RT_MASK; |
| fl4.flowi4_scope = RT_SCOPE_UNIVERSE; |
| fl4.flowi4_flags = 0; |
| |
| fl4.flowi4_proto = params->l4_protocol; |
| fl4.daddr = params->ipv4_dst; |
| fl4.saddr = params->ipv4_src; |
| fl4.fl4_sport = params->sport; |
| fl4.fl4_dport = params->dport; |
| |
| if (flags & BPF_FIB_LOOKUP_DIRECT) { |
| u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; |
| struct fib_table *tb; |
| |
| tb = fib_get_table(net, tbid); |
| if (unlikely(!tb)) |
| return BPF_FIB_LKUP_RET_NOT_FWDED; |
| |
| err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF); |
| } else { |
| fl4.flowi4_mark = 0; |
| fl4.flowi4_secid = 0; |
| fl4.flowi4_tun_key.tun_id = 0; |
| fl4.flowi4_uid = sock_net_uid(net, NULL); |
| |
| err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF); |
| } |
| |
| if (err) { |
| /* map fib lookup errors to RTN_ type */ |
| if (err == -EINVAL) |
| return BPF_FIB_LKUP_RET_BLACKHOLE; |
| if (err == -EHOSTUNREACH) |
| return BPF_FIB_LKUP_RET_UNREACHABLE; |
| if (err == -EACCES) |
| return BPF_FIB_LKUP_RET_PROHIBIT; |
| |
| return BPF_FIB_LKUP_RET_NOT_FWDED; |
| } |
| |
| if (res.type != RTN_UNICAST) |
| return BPF_FIB_LKUP_RET_NOT_FWDED; |
| |
| if (fib_info_num_path(res.fi) > 1) |
| fib_select_path(net, &res, &fl4, NULL); |
| |
| if (check_mtu) { |
| mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst); |
| if (params->tot_len > mtu) |
| return BPF_FIB_LKUP_RET_FRAG_NEEDED; |
| } |
| |
| nhc = res.nhc; |
| |
| /* do not handle lwt encaps right now */ |
| if (nhc->nhc_lwtstate) |
| return BPF_FIB_LKUP_RET_UNSUPP_LWT; |
| |
| dev = nhc->nhc_dev; |
| |
| params->rt_metric = res.fi->fib_priority; |
| |
| /* xdp and cls_bpf programs are run in RCU-bh so |
| * rcu_read_lock_bh is not needed here |
| */ |
| if (likely(nhc->nhc_gw_family != AF_INET6)) { |
| if (nhc->nhc_gw_family) |
| params->ipv4_dst = nhc->nhc_gw.ipv4; |
| |
| neigh = __ipv4_neigh_lookup_noref(dev, |
| (__force u32)params->ipv4_dst); |
| } else { |
| struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst; |
| |
| params->family = AF_INET6; |
| *dst = nhc->nhc_gw.ipv6; |
| neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); |
| } |
| |
| if (!neigh) |
| return BPF_FIB_LKUP_RET_NO_NEIGH; |
| |
| return bpf_fib_set_fwd_params(params, neigh, dev); |
| } |
| #endif |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params, |
| u32 flags, bool check_mtu) |
| { |
| struct in6_addr *src = (struct in6_addr *) params->ipv6_src; |
| struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst; |
| struct fib6_result res = {}; |
| struct neighbour *neigh; |
| struct net_device *dev; |
| struct inet6_dev *idev; |
| struct flowi6 fl6; |
| int strict = 0; |
| int oif, err; |
| u32 mtu; |
| |
| /* link local addresses are never forwarded */ |
| if (rt6_need_strict(dst) || rt6_need_strict(src)) |
| return BPF_FIB_LKUP_RET_NOT_FWDED; |
| |
| dev = dev_get_by_index_rcu(net, params->ifindex); |
| if (unlikely(!dev)) |
| return -ENODEV; |
| |
| idev = __in6_dev_get_safely(dev); |
| if (unlikely(!idev || !idev->cnf.forwarding)) |
| return BPF_FIB_LKUP_RET_FWD_DISABLED; |
| |
| if (flags & BPF_FIB_LOOKUP_OUTPUT) { |
| fl6.flowi6_iif = 1; |
| oif = fl6.flowi6_oif = params->ifindex; |
| } else { |
| oif = fl6.flowi6_iif = params->ifindex; |
| fl6.flowi6_oif = 0; |
| strict = RT6_LOOKUP_F_HAS_SADDR; |
| } |
| fl6.flowlabel = params->flowinfo; |
| fl6.flowi6_scope = 0; |
| fl6.flowi6_flags = 0; |
| fl6.mp_hash = 0; |
| |
| fl6.flowi6_proto = params->l4_protocol; |
| fl6.daddr = *dst; |
| fl6.saddr = *src; |
| fl6.fl6_sport = params->sport; |
| fl6.fl6_dport = params->dport; |
| |
| if (flags & BPF_FIB_LOOKUP_DIRECT) { |
| u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN; |
| struct fib6_table *tb; |
| |
| tb = ipv6_stub->fib6_get_table(net, tbid); |
| if (unlikely(!tb)) |
| return BPF_FIB_LKUP_RET_NOT_FWDED; |
| |
| err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res, |
| strict); |
| } else { |
| fl6.flowi6_mark = 0; |
| fl6.flowi6_secid = 0; |
| fl6.flowi6_tun_key.tun_id = 0; |
| fl6.flowi6_uid = sock_net_uid(net, NULL); |
| |
| err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict); |
| } |
| |
| if (unlikely(err || IS_ERR_OR_NULL(res.f6i) || |
| res.f6i == net->ipv6.fib6_null_entry)) |
| return BPF_FIB_LKUP_RET_NOT_FWDED; |
| |
| switch (res.fib6_type) { |
| /* only unicast is forwarded */ |
| case RTN_UNICAST: |
| break; |
| case RTN_BLACKHOLE: |
| return BPF_FIB_LKUP_RET_BLACKHOLE; |
| case RTN_UNREACHABLE: |
| return BPF_FIB_LKUP_RET_UNREACHABLE; |
| case RTN_PROHIBIT: |
| return BPF_FIB_LKUP_RET_PROHIBIT; |
| default: |
| return BPF_FIB_LKUP_RET_NOT_FWDED; |
| } |
| |
| ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif, |
| fl6.flowi6_oif != 0, NULL, strict); |
| |
| if (check_mtu) { |
| mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src); |
| if (params->tot_len > mtu) |
| return BPF_FIB_LKUP_RET_FRAG_NEEDED; |
| } |
| |
| if (res.nh->fib_nh_lws) |
| return BPF_FIB_LKUP_RET_UNSUPP_LWT; |
| |
| if (res.nh->fib_nh_gw_family) |
| *dst = res.nh->fib_nh_gw6; |
| |
| dev = res.nh->fib_nh_dev; |
| params->rt_metric = res.f6i->fib6_metric; |
| |
| /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is |
| * not needed here. |
| */ |
| neigh = __ipv6_neigh_lookup_noref_stub(dev, dst); |
| if (!neigh) |
| return BPF_FIB_LKUP_RET_NO_NEIGH; |
| |
| return bpf_fib_set_fwd_params(params, neigh, dev); |
| } |
| #endif |
| |
| BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx, |
| struct bpf_fib_lookup *, params, int, plen, u32, flags) |
| { |
| if (plen < sizeof(*params)) |
| return -EINVAL; |
| |
| if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) |
| return -EINVAL; |
| |
| switch (params->family) { |
| #if IS_ENABLED(CONFIG_INET) |
| case AF_INET: |
| return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params, |
| flags, true); |
| #endif |
| #if IS_ENABLED(CONFIG_IPV6) |
| case AF_INET6: |
| return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params, |
| flags, true); |
| #endif |
| } |
| return -EAFNOSUPPORT; |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = { |
| .func = bpf_xdp_fib_lookup, |
| .gpl_only = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb, |
| struct bpf_fib_lookup *, params, int, plen, u32, flags) |
| { |
| struct net *net = dev_net(skb->dev); |
| int rc = -EAFNOSUPPORT; |
| |
| if (plen < sizeof(*params)) |
| return -EINVAL; |
| |
| if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT)) |
| return -EINVAL; |
| |
| switch (params->family) { |
| #if IS_ENABLED(CONFIG_INET) |
| case AF_INET: |
| rc = bpf_ipv4_fib_lookup(net, params, flags, false); |
| break; |
| #endif |
| #if IS_ENABLED(CONFIG_IPV6) |
| case AF_INET6: |
| rc = bpf_ipv6_fib_lookup(net, params, flags, false); |
| break; |
| #endif |
| } |
| |
| if (!rc) { |
| struct net_device *dev; |
| |
| dev = dev_get_by_index_rcu(net, params->ifindex); |
| if (!is_skb_forwardable(dev, skb)) |
| rc = BPF_FIB_LKUP_RET_FRAG_NEEDED; |
| } |
| |
| return rc; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_fib_lookup_proto = { |
| .func = bpf_skb_fib_lookup, |
| .gpl_only = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
| static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len) |
| { |
| int err; |
| struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr; |
| |
| if (!seg6_validate_srh(srh, len, false)) |
| return -EINVAL; |
| |
| switch (type) { |
| case BPF_LWT_ENCAP_SEG6_INLINE: |
| if (skb->protocol != htons(ETH_P_IPV6)) |
| return -EBADMSG; |
| |
| err = seg6_do_srh_inline(skb, srh); |
| break; |
| case BPF_LWT_ENCAP_SEG6: |
| skb_reset_inner_headers(skb); |
| skb->encapsulation = 1; |
| err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| bpf_compute_data_pointers(skb); |
| if (err) |
| return err; |
| |
| ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); |
| skb_set_transport_header(skb, sizeof(struct ipv6hdr)); |
| |
| return seg6_lookup_nexthop(skb, NULL, 0); |
| } |
| #endif /* CONFIG_IPV6_SEG6_BPF */ |
| |
| #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) |
| static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len, |
| bool ingress) |
| { |
| return bpf_lwt_push_ip_encap(skb, hdr, len, ingress); |
| } |
| #endif |
| |
| BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr, |
| u32, len) |
| { |
| switch (type) { |
| #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
| case BPF_LWT_ENCAP_SEG6: |
| case BPF_LWT_ENCAP_SEG6_INLINE: |
| return bpf_push_seg6_encap(skb, type, hdr, len); |
| #endif |
| #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) |
| case BPF_LWT_ENCAP_IP: |
| return bpf_push_ip_encap(skb, hdr, len, true /* ingress */); |
| #endif |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type, |
| void *, hdr, u32, len) |
| { |
| switch (type) { |
| #if IS_ENABLED(CONFIG_LWTUNNEL_BPF) |
| case BPF_LWT_ENCAP_IP: |
| return bpf_push_ip_encap(skb, hdr, len, false /* egress */); |
| #endif |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = { |
| .func = bpf_lwt_in_push_encap, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_MEM, |
| .arg4_type = ARG_CONST_SIZE |
| }; |
| |
| static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = { |
| .func = bpf_lwt_xmit_push_encap, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_MEM, |
| .arg4_type = ARG_CONST_SIZE |
| }; |
| |
| #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
| BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset, |
| const void *, from, u32, len) |
| { |
| struct seg6_bpf_srh_state *srh_state = |
| this_cpu_ptr(&seg6_bpf_srh_states); |
| struct ipv6_sr_hdr *srh = srh_state->srh; |
| void *srh_tlvs, *srh_end, *ptr; |
| int srhoff = 0; |
| |
| if (srh == NULL) |
| return -EINVAL; |
| |
| srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4)); |
| srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen); |
| |
| ptr = skb->data + offset; |
| if (ptr >= srh_tlvs && ptr + len <= srh_end) |
| srh_state->valid = false; |
| else if (ptr < (void *)&srh->flags || |
| ptr + len > (void *)&srh->segments) |
| return -EFAULT; |
| |
| if (unlikely(bpf_try_make_writable(skb, offset + len))) |
| return -EFAULT; |
| if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
| return -EINVAL; |
| srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); |
| |
| memcpy(skb->data + offset, from, len); |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = { |
| .func = bpf_lwt_seg6_store_bytes, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_MEM, |
| .arg4_type = ARG_CONST_SIZE |
| }; |
| |
| static void bpf_update_srh_state(struct sk_buff *skb) |
| { |
| struct seg6_bpf_srh_state *srh_state = |
| this_cpu_ptr(&seg6_bpf_srh_states); |
| int srhoff = 0; |
| |
| if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) { |
| srh_state->srh = NULL; |
| } else { |
| srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); |
| srh_state->hdrlen = srh_state->srh->hdrlen << 3; |
| srh_state->valid = true; |
| } |
| } |
| |
| BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb, |
| u32, action, void *, param, u32, param_len) |
| { |
| struct seg6_bpf_srh_state *srh_state = |
| this_cpu_ptr(&seg6_bpf_srh_states); |
| int hdroff = 0; |
| int err; |
| |
| switch (action) { |
| case SEG6_LOCAL_ACTION_END_X: |
| if (!seg6_bpf_has_valid_srh(skb)) |
| return -EBADMSG; |
| if (param_len != sizeof(struct in6_addr)) |
| return -EINVAL; |
| return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0); |
| case SEG6_LOCAL_ACTION_END_T: |
| if (!seg6_bpf_has_valid_srh(skb)) |
| return -EBADMSG; |
| if (param_len != sizeof(int)) |
| return -EINVAL; |
| return seg6_lookup_nexthop(skb, NULL, *(int *)param); |
| case SEG6_LOCAL_ACTION_END_DT6: |
| if (!seg6_bpf_has_valid_srh(skb)) |
| return -EBADMSG; |
| if (param_len != sizeof(int)) |
| return -EINVAL; |
| |
| if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0) |
| return -EBADMSG; |
| if (!pskb_pull(skb, hdroff)) |
| return -EBADMSG; |
| |
| skb_postpull_rcsum(skb, skb_network_header(skb), hdroff); |
| skb_reset_network_header(skb); |
| skb_reset_transport_header(skb); |
| skb->encapsulation = 0; |
| |
| bpf_compute_data_pointers(skb); |
| bpf_update_srh_state(skb); |
| return seg6_lookup_nexthop(skb, NULL, *(int *)param); |
| case SEG6_LOCAL_ACTION_END_B6: |
| if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
| return -EBADMSG; |
| err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE, |
| param, param_len); |
| if (!err) |
| bpf_update_srh_state(skb); |
| |
| return err; |
| case SEG6_LOCAL_ACTION_END_B6_ENCAP: |
| if (srh_state->srh && !seg6_bpf_has_valid_srh(skb)) |
| return -EBADMSG; |
| err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6, |
| param, param_len); |
| if (!err) |
| bpf_update_srh_state(skb); |
| |
| return err; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| static const struct bpf_func_proto bpf_lwt_seg6_action_proto = { |
| .func = bpf_lwt_seg6_action, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_MEM, |
| .arg4_type = ARG_CONST_SIZE |
| }; |
| |
| BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset, |
| s32, len) |
| { |
| struct seg6_bpf_srh_state *srh_state = |
| this_cpu_ptr(&seg6_bpf_srh_states); |
| struct ipv6_sr_hdr *srh = srh_state->srh; |
| void *srh_end, *srh_tlvs, *ptr; |
| struct ipv6hdr *hdr; |
| int srhoff = 0; |
| int ret; |
| |
| if (unlikely(srh == NULL)) |
| return -EINVAL; |
| |
| srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) + |
| ((srh->first_segment + 1) << 4)); |
| srh_end = (void *)((unsigned char *)srh + sizeof(*srh) + |
| srh_state->hdrlen); |
| ptr = skb->data + offset; |
| |
| if (unlikely(ptr < srh_tlvs || ptr > srh_end)) |
| return -EFAULT; |
| if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end)) |
| return -EFAULT; |
| |
| if (len > 0) { |
| ret = skb_cow_head(skb, len); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| ret = bpf_skb_net_hdr_push(skb, offset, len); |
| } else { |
| ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len); |
| } |
| |
| bpf_compute_data_pointers(skb); |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| hdr = (struct ipv6hdr *)skb->data; |
| hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); |
| |
| if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) |
| return -EINVAL; |
| srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff); |
| srh_state->hdrlen += len; |
| srh_state->valid = false; |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = { |
| .func = bpf_lwt_seg6_adjust_srh, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| #endif /* CONFIG_IPV6_SEG6_BPF */ |
| |
| #ifdef CONFIG_INET |
| static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, |
| int dif, int sdif, u8 family, u8 proto) |
| { |
| bool refcounted = false; |
| struct sock *sk = NULL; |
| |
| if (family == AF_INET) { |
| __be32 src4 = tuple->ipv4.saddr; |
| __be32 dst4 = tuple->ipv4.daddr; |
| |
| if (proto == IPPROTO_TCP) |
| sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0, |
| src4, tuple->ipv4.sport, |
| dst4, tuple->ipv4.dport, |
| dif, sdif, &refcounted); |
| else |
| sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport, |
| dst4, tuple->ipv4.dport, |
| dif, sdif, &udp_table, NULL); |
| #if IS_ENABLED(CONFIG_IPV6) |
| } else { |
| struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr; |
| struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr; |
| |
| if (proto == IPPROTO_TCP) |
| sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0, |
| src6, tuple->ipv6.sport, |
| dst6, ntohs(tuple->ipv6.dport), |
| dif, sdif, &refcounted); |
| else if (likely(ipv6_bpf_stub)) |
| sk = ipv6_bpf_stub->udp6_lib_lookup(net, |
| src6, tuple->ipv6.sport, |
| dst6, tuple->ipv6.dport, |
| dif, sdif, |
| &udp_table, NULL); |
| #endif |
| } |
| |
| if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) { |
| WARN_ONCE(1, "Found non-RCU, unreferenced socket!"); |
| sk = NULL; |
| } |
| return sk; |
| } |
| |
| /* bpf_skc_lookup performs the core lookup for different types of sockets, |
| * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE. |
| * Returns the socket as an 'unsigned long' to simplify the casting in the |
| * callers to satisfy BPF_CALL declarations. |
| */ |
| static struct sock * |
| __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, |
| struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, |
| u64 flags) |
| { |
| struct sock *sk = NULL; |
| u8 family = AF_UNSPEC; |
| struct net *net; |
| int sdif; |
| |
| if (len == sizeof(tuple->ipv4)) |
| family = AF_INET; |
| else if (len == sizeof(tuple->ipv6)) |
| family = AF_INET6; |
| else |
| return NULL; |
| |
| if (unlikely(family == AF_UNSPEC || flags || |
| !((s32)netns_id < 0 || netns_id <= S32_MAX))) |
| goto out; |
| |
| if (family == AF_INET) |
| sdif = inet_sdif(skb); |
| else |
| sdif = inet6_sdif(skb); |
| |
| if ((s32)netns_id < 0) { |
| net = caller_net; |
| sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); |
| } else { |
| net = get_net_ns_by_id(caller_net, netns_id); |
| if (unlikely(!net)) |
| goto out; |
| sk = sk_lookup(net, tuple, ifindex, sdif, family, proto); |
| put_net(net); |
| } |
| |
| out: |
| return sk; |
| } |
| |
| static struct sock * |
| __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, |
| struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, |
| u64 flags) |
| { |
| struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, |
| ifindex, proto, netns_id, flags); |
| |
| if (sk) { |
| sk = sk_to_full_sk(sk); |
| if (!sk_fullsock(sk)) { |
| sock_gen_put(sk); |
| return NULL; |
| } |
| } |
| |
| return sk; |
| } |
| |
| static struct sock * |
| bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, |
| u8 proto, u64 netns_id, u64 flags) |
| { |
| struct net *caller_net; |
| int ifindex; |
| |
| if (skb->dev) { |
| caller_net = dev_net(skb->dev); |
| ifindex = skb->dev->ifindex; |
| } else { |
| caller_net = sock_net(skb->sk); |
| ifindex = 0; |
| } |
| |
| return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, |
| netns_id, flags); |
| } |
| |
| static struct sock * |
| bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, |
| u8 proto, u64 netns_id, u64 flags) |
| { |
| struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id, |
| flags); |
| |
| if (sk) { |
| sk = sk_to_full_sk(sk); |
| if (!sk_fullsock(sk)) { |
| sock_gen_put(sk); |
| return NULL; |
| } |
| } |
| |
| return sk; |
| } |
| |
| BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb, |
| struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) |
| { |
| return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP, |
| netns_id, flags); |
| } |
| |
| static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = { |
| .func = bpf_skc_lookup_tcp, |
| .gpl_only = false, |
| .pkt_access = true, |
| .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb, |
| struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) |
| { |
| return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP, |
| netns_id, flags); |
| } |
| |
| static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = { |
| .func = bpf_sk_lookup_tcp, |
| .gpl_only = false, |
| .pkt_access = true, |
| .ret_type = RET_PTR_TO_SOCKET_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb, |
| struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) |
| { |
| return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP, |
| netns_id, flags); |
| } |
| |
| static const struct bpf_func_proto bpf_sk_lookup_udp_proto = { |
| .func = bpf_sk_lookup_udp, |
| .gpl_only = false, |
| .pkt_access = true, |
| .ret_type = RET_PTR_TO_SOCKET_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_1(bpf_sk_release, struct sock *, sk) |
| { |
| if (sk_is_refcounted(sk)) |
| sock_gen_put(sk); |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_sk_release_proto = { |
| .func = bpf_sk_release, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_SOCK_COMMON, |
| }; |
| |
| BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, |
| struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) |
| { |
| struct net *caller_net = dev_net(ctx->rxq->dev); |
| int ifindex = ctx->rxq->dev->ifindex; |
| |
| return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, |
| ifindex, IPPROTO_UDP, netns_id, |
| flags); |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { |
| .func = bpf_xdp_sk_lookup_udp, |
| .gpl_only = false, |
| .pkt_access = true, |
| .ret_type = RET_PTR_TO_SOCKET_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, |
| struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) |
| { |
| struct net *caller_net = dev_net(ctx->rxq->dev); |
| int ifindex = ctx->rxq->dev->ifindex; |
| |
| return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, |
| ifindex, IPPROTO_TCP, netns_id, |
| flags); |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { |
| .func = bpf_xdp_skc_lookup_tcp, |
| .gpl_only = false, |
| .pkt_access = true, |
| .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, |
| struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) |
| { |
| struct net *caller_net = dev_net(ctx->rxq->dev); |
| int ifindex = ctx->rxq->dev->ifindex; |
| |
| return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, |
| ifindex, IPPROTO_TCP, netns_id, |
| flags); |
| } |
| |
| static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { |
| .func = bpf_xdp_sk_lookup_tcp, |
| .gpl_only = false, |
| .pkt_access = true, |
| .ret_type = RET_PTR_TO_SOCKET_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, |
| struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) |
| { |
| return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, |
| sock_net(ctx->sk), 0, |
| IPPROTO_TCP, netns_id, flags); |
| } |
| |
| static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { |
| .func = bpf_sock_addr_skc_lookup_tcp, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_SOCK_COMMON_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, |
| struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) |
| { |
| return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, |
| sock_net(ctx->sk), 0, IPPROTO_TCP, |
| netns_id, flags); |
| } |
| |
| static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { |
| .func = bpf_sock_addr_sk_lookup_tcp, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_SOCKET_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, |
| struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) |
| { |
| return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, |
| sock_net(ctx->sk), 0, IPPROTO_UDP, |
| netns_id, flags); |
| } |
| |
| static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = { |
| .func = bpf_sock_addr_sk_lookup_udp, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_SOCKET_OR_NULL, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_ANYTHING, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type, |
| struct bpf_insn_access_aux *info) |
| { |
| if (off < 0 || off >= offsetofend(struct bpf_tcp_sock, |
| icsk_retransmits)) |
| return false; |
| |
| if (off % size != 0) |
| return false; |
| |
| switch (off) { |
| case offsetof(struct bpf_tcp_sock, bytes_received): |
| case offsetof(struct bpf_tcp_sock, bytes_acked): |
| return size == sizeof(__u64); |
| default: |
| return size == sizeof(__u32); |
| } |
| } |
| |
| u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| #define BPF_TCP_SOCK_GET_COMMON(FIELD) \ |
| do { \ |
| BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) > \ |
| sizeof_field(struct bpf_tcp_sock, FIELD)); \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\ |
| si->dst_reg, si->src_reg, \ |
| offsetof(struct tcp_sock, FIELD)); \ |
| } while (0) |
| |
| #define BPF_INET_SOCK_GET_COMMON(FIELD) \ |
| do { \ |
| BUILD_BUG_ON(sizeof_field(struct inet_connection_sock, \ |
| FIELD) > \ |
| sizeof_field(struct bpf_tcp_sock, FIELD)); \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
| struct inet_connection_sock, \ |
| FIELD), \ |
| si->dst_reg, si->src_reg, \ |
| offsetof( \ |
| struct inet_connection_sock, \ |
| FIELD)); \ |
| } while (0) |
| |
| if (insn > insn_buf) |
| return insn - insn_buf; |
| |
| switch (si->off) { |
| case offsetof(struct bpf_tcp_sock, rtt_min): |
| BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != |
| sizeof(struct minmax)); |
| BUILD_BUG_ON(sizeof(struct minmax) < |
| sizeof(struct minmax_sample)); |
| |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| offsetof(struct tcp_sock, rtt_min) + |
| offsetof(struct minmax_sample, v)); |
| break; |
| case offsetof(struct bpf_tcp_sock, snd_cwnd): |
| BPF_TCP_SOCK_GET_COMMON(snd_cwnd); |
| break; |
| case offsetof(struct bpf_tcp_sock, srtt_us): |
| BPF_TCP_SOCK_GET_COMMON(srtt_us); |
| break; |
| case offsetof(struct bpf_tcp_sock, snd_ssthresh): |
| BPF_TCP_SOCK_GET_COMMON(snd_ssthresh); |
| break; |
| case offsetof(struct bpf_tcp_sock, rcv_nxt): |
| BPF_TCP_SOCK_GET_COMMON(rcv_nxt); |
| break; |
| case offsetof(struct bpf_tcp_sock, snd_nxt): |
| BPF_TCP_SOCK_GET_COMMON(snd_nxt); |
| break; |
| case offsetof(struct bpf_tcp_sock, snd_una): |
| BPF_TCP_SOCK_GET_COMMON(snd_una); |
| break; |
| case offsetof(struct bpf_tcp_sock, mss_cache): |
| BPF_TCP_SOCK_GET_COMMON(mss_cache); |
| break; |
| case offsetof(struct bpf_tcp_sock, ecn_flags): |
| BPF_TCP_SOCK_GET_COMMON(ecn_flags); |
| break; |
| case offsetof(struct bpf_tcp_sock, rate_delivered): |
| BPF_TCP_SOCK_GET_COMMON(rate_delivered); |
| break; |
| case offsetof(struct bpf_tcp_sock, rate_interval_us): |
| BPF_TCP_SOCK_GET_COMMON(rate_interval_us); |
| break; |
| case offsetof(struct bpf_tcp_sock, packets_out): |
| BPF_TCP_SOCK_GET_COMMON(packets_out); |
| break; |
| case offsetof(struct bpf_tcp_sock, retrans_out): |
| BPF_TCP_SOCK_GET_COMMON(retrans_out); |
| break; |
| case offsetof(struct bpf_tcp_sock, total_retrans): |
| BPF_TCP_SOCK_GET_COMMON(total_retrans); |
| break; |
| case offsetof(struct bpf_tcp_sock, segs_in): |
| BPF_TCP_SOCK_GET_COMMON(segs_in); |
| break; |
| case offsetof(struct bpf_tcp_sock, data_segs_in): |
| BPF_TCP_SOCK_GET_COMMON(data_segs_in); |
| break; |
| case offsetof(struct bpf_tcp_sock, segs_out): |
| BPF_TCP_SOCK_GET_COMMON(segs_out); |
| break; |
| case offsetof(struct bpf_tcp_sock, data_segs_out): |
| BPF_TCP_SOCK_GET_COMMON(data_segs_out); |
| break; |
| case offsetof(struct bpf_tcp_sock, lost_out): |
| BPF_TCP_SOCK_GET_COMMON(lost_out); |
| break; |
| case offsetof(struct bpf_tcp_sock, sacked_out): |
| BPF_TCP_SOCK_GET_COMMON(sacked_out); |
| break; |
| case offsetof(struct bpf_tcp_sock, bytes_received): |
| BPF_TCP_SOCK_GET_COMMON(bytes_received); |
| break; |
| case offsetof(struct bpf_tcp_sock, bytes_acked): |
| BPF_TCP_SOCK_GET_COMMON(bytes_acked); |
| break; |
| case offsetof(struct bpf_tcp_sock, dsack_dups): |
| BPF_TCP_SOCK_GET_COMMON(dsack_dups); |
| break; |
| case offsetof(struct bpf_tcp_sock, delivered): |
| BPF_TCP_SOCK_GET_COMMON(delivered); |
| break; |
| case offsetof(struct bpf_tcp_sock, delivered_ce): |
| BPF_TCP_SOCK_GET_COMMON(delivered_ce); |
| break; |
| case offsetof(struct bpf_tcp_sock, icsk_retransmits): |
| BPF_INET_SOCK_GET_COMMON(icsk_retransmits); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| BPF_CALL_1(bpf_tcp_sock, struct sock *, sk) |
| { |
| if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) |
| return (unsigned long)sk; |
| |
| return (unsigned long)NULL; |
| } |
| |
| const struct bpf_func_proto bpf_tcp_sock_proto = { |
| .func = bpf_tcp_sock, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_TCP_SOCK_OR_NULL, |
| .arg1_type = ARG_PTR_TO_SOCK_COMMON, |
| }; |
| |
| BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk) |
| { |
| sk = sk_to_full_sk(sk); |
| |
| if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE)) |
| return (unsigned long)sk; |
| |
| return (unsigned long)NULL; |
| } |
| |
| static const struct bpf_func_proto bpf_get_listener_sock_proto = { |
| .func = bpf_get_listener_sock, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_SOCKET_OR_NULL, |
| .arg1_type = ARG_PTR_TO_SOCK_COMMON, |
| }; |
| |
| BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb) |
| { |
| unsigned int iphdr_len; |
| |
| switch (skb_protocol(skb, true)) { |
| case cpu_to_be16(ETH_P_IP): |
| iphdr_len = sizeof(struct iphdr); |
| break; |
| case cpu_to_be16(ETH_P_IPV6): |
| iphdr_len = sizeof(struct ipv6hdr); |
| break; |
| default: |
| return 0; |
| } |
| |
| if (skb_headlen(skb) < iphdr_len) |
| return 0; |
| |
| if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len)) |
| return 0; |
| |
| return INET_ECN_set_ce(skb); |
| } |
| |
| bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type, |
| struct bpf_insn_access_aux *info) |
| { |
| if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id)) |
| return false; |
| |
| if (off % size != 0) |
| return false; |
| |
| switch (off) { |
| default: |
| return size == sizeof(__u32); |
| } |
| } |
| |
| u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| #define BPF_XDP_SOCK_GET(FIELD) \ |
| do { \ |
| BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) > \ |
| sizeof_field(struct bpf_xdp_sock, FIELD)); \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\ |
| si->dst_reg, si->src_reg, \ |
| offsetof(struct xdp_sock, FIELD)); \ |
| } while (0) |
| |
| switch (si->off) { |
| case offsetof(struct bpf_xdp_sock, queue_id): |
| BPF_XDP_SOCK_GET(queue_id); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = { |
| .func = bpf_skb_ecn_set_ce, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| }; |
| |
| BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len, |
| struct tcphdr *, th, u32, th_len) |
| { |
| #ifdef CONFIG_SYN_COOKIES |
| u32 cookie; |
| int ret; |
| |
| if (unlikely(th_len < sizeof(*th))) |
| return -EINVAL; |
| |
| /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */ |
| if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) |
| return -EINVAL; |
| |
| if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) |
| return -EINVAL; |
| |
| if (!th->ack || th->rst || th->syn) |
| return -ENOENT; |
| |
| if (tcp_synq_no_recent_overflow(sk)) |
| return -ENOENT; |
| |
| cookie = ntohl(th->ack_seq) - 1; |
| |
| switch (sk->sk_family) { |
| case AF_INET: |
| if (unlikely(iph_len < sizeof(struct iphdr))) |
| return -EINVAL; |
| |
| ret = __cookie_v4_check((struct iphdr *)iph, th, cookie); |
| break; |
| |
| #if IS_BUILTIN(CONFIG_IPV6) |
| case AF_INET6: |
| if (unlikely(iph_len < sizeof(struct ipv6hdr))) |
| return -EINVAL; |
| |
| ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie); |
| break; |
| #endif /* CONFIG_IPV6 */ |
| |
| default: |
| return -EPROTONOSUPPORT; |
| } |
| |
| if (ret > 0) |
| return 0; |
| |
| return -ENOENT; |
| #else |
| return -ENOTSUPP; |
| #endif |
| } |
| |
| static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = { |
| .func = bpf_tcp_check_syncookie, |
| .gpl_only = true, |
| .pkt_access = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_SOCK_COMMON, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_PTR_TO_MEM, |
| .arg5_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len, |
| struct tcphdr *, th, u32, th_len) |
| { |
| #ifdef CONFIG_SYN_COOKIES |
| u32 cookie; |
| u16 mss; |
| |
| if (unlikely(th_len < sizeof(*th) || th_len != th->doff * 4)) |
| return -EINVAL; |
| |
| if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN) |
| return -EINVAL; |
| |
| if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies) |
| return -ENOENT; |
| |
| if (!th->syn || th->ack || th->fin || th->rst) |
| return -EINVAL; |
| |
| if (unlikely(iph_len < sizeof(struct iphdr))) |
| return -EINVAL; |
| |
| /* Both struct iphdr and struct ipv6hdr have the version field at the |
| * same offset so we can cast to the shorter header (struct iphdr). |
| */ |
| switch (((struct iphdr *)iph)->version) { |
| case 4: |
| if (sk->sk_family == AF_INET6 && sk->sk_ipv6only) |
| return -EINVAL; |
| |
| mss = tcp_v4_get_syncookie(sk, iph, th, &cookie); |
| break; |
| |
| #if IS_BUILTIN(CONFIG_IPV6) |
| case 6: |
| if (unlikely(iph_len < sizeof(struct ipv6hdr))) |
| return -EINVAL; |
| |
| if (sk->sk_family != AF_INET6) |
| return -EINVAL; |
| |
| mss = tcp_v6_get_syncookie(sk, iph, th, &cookie); |
| break; |
| #endif /* CONFIG_IPV6 */ |
| |
| default: |
| return -EPROTONOSUPPORT; |
| } |
| if (mss == 0) |
| return -ENOENT; |
| |
| return cookie | ((u64)mss << 32); |
| #else |
| return -EOPNOTSUPP; |
| #endif /* CONFIG_SYN_COOKIES */ |
| } |
| |
| static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = { |
| .func = bpf_tcp_gen_syncookie, |
| .gpl_only = true, /* __cookie_v*_init_sequence() is GPL */ |
| .pkt_access = true, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_SOCK_COMMON, |
| .arg2_type = ARG_PTR_TO_MEM, |
| .arg3_type = ARG_CONST_SIZE, |
| .arg4_type = ARG_PTR_TO_MEM, |
| .arg5_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags) |
| { |
| if (flags != 0) |
| return -EINVAL; |
| if (!skb_at_tc_ingress(skb)) |
| return -EOPNOTSUPP; |
| if (unlikely(dev_net(skb->dev) != sock_net(sk))) |
| return -ENETUNREACH; |
| if (unlikely(sk_fullsock(sk) && sk->sk_reuseport)) |
| return -ESOCKTNOSUPPORT; |
| if (sk_is_refcounted(sk) && |
| unlikely(!refcount_inc_not_zero(&sk->sk_refcnt))) |
| return -ENOENT; |
| |
| skb_orphan(skb); |
| skb->sk = sk; |
| skb->destructor = sock_pfree; |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_sk_assign_proto = { |
| .func = bpf_sk_assign, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_SOCK_COMMON, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| #endif /* CONFIG_INET */ |
| |
| bool bpf_helper_changes_pkt_data(void *func) |
| { |
| if (func == bpf_skb_vlan_push || |
| func == bpf_skb_vlan_pop || |
| func == bpf_skb_store_bytes || |
| func == bpf_skb_change_proto || |
| func == bpf_skb_change_head || |
| func == sk_skb_change_head || |
| func == bpf_skb_change_tail || |
| func == sk_skb_change_tail || |
| func == bpf_skb_adjust_room || |
| func == bpf_skb_pull_data || |
| func == sk_skb_pull_data || |
| func == bpf_clone_redirect || |
| func == bpf_l3_csum_replace || |
| func == bpf_l4_csum_replace || |
| func == bpf_xdp_adjust_head || |
| func == bpf_xdp_adjust_meta || |
| func == bpf_msg_pull_data || |
| func == bpf_msg_push_data || |
| func == bpf_msg_pop_data || |
| func == bpf_xdp_adjust_tail || |
| #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
| func == bpf_lwt_seg6_store_bytes || |
| func == bpf_lwt_seg6_adjust_srh || |
| func == bpf_lwt_seg6_action || |
| #endif |
| func == bpf_lwt_in_push_encap || |
| func == bpf_lwt_xmit_push_encap) |
| return true; |
| |
| return false; |
| } |
| |
| const struct bpf_func_proto bpf_event_output_data_proto __weak; |
| const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak; |
| |
| static const struct bpf_func_proto * |
| sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| /* inet and inet6 sockets are created in a process |
| * context so there is always a valid uid/gid |
| */ |
| case BPF_FUNC_get_current_uid_gid: |
| return &bpf_get_current_uid_gid_proto; |
| case BPF_FUNC_get_local_storage: |
| return &bpf_get_local_storage_proto; |
| case BPF_FUNC_get_socket_cookie: |
| return &bpf_get_socket_cookie_sock_proto; |
| case BPF_FUNC_get_netns_cookie: |
| return &bpf_get_netns_cookie_sock_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_event_output_data_proto; |
| case BPF_FUNC_get_current_pid_tgid: |
| return &bpf_get_current_pid_tgid_proto; |
| case BPF_FUNC_get_current_comm: |
| return &bpf_get_current_comm_proto; |
| #ifdef CONFIG_CGROUPS |
| case BPF_FUNC_get_current_cgroup_id: |
| return &bpf_get_current_cgroup_id_proto; |
| case BPF_FUNC_get_current_ancestor_cgroup_id: |
| return &bpf_get_current_ancestor_cgroup_id_proto; |
| #endif |
| #ifdef CONFIG_CGROUP_NET_CLASSID |
| case BPF_FUNC_get_cgroup_classid: |
| return &bpf_get_cgroup_classid_curr_proto; |
| #endif |
| case BPF_FUNC_sk_storage_get: |
| return &bpf_sk_storage_get_cg_sock_proto; |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| /* inet and inet6 sockets are created in a process |
| * context so there is always a valid uid/gid |
| */ |
| case BPF_FUNC_get_current_uid_gid: |
| return &bpf_get_current_uid_gid_proto; |
| case BPF_FUNC_bind: |
| switch (prog->expected_attach_type) { |
| case BPF_CGROUP_INET4_CONNECT: |
| case BPF_CGROUP_INET6_CONNECT: |
| return &bpf_bind_proto; |
| default: |
| return NULL; |
| } |
| case BPF_FUNC_get_socket_cookie: |
| return &bpf_get_socket_cookie_sock_addr_proto; |
| case BPF_FUNC_get_netns_cookie: |
| return &bpf_get_netns_cookie_sock_addr_proto; |
| case BPF_FUNC_get_local_storage: |
| return &bpf_get_local_storage_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_event_output_data_proto; |
| case BPF_FUNC_get_current_pid_tgid: |
| return &bpf_get_current_pid_tgid_proto; |
| case BPF_FUNC_get_current_comm: |
| return &bpf_get_current_comm_proto; |
| #ifdef CONFIG_CGROUPS |
| case BPF_FUNC_get_current_cgroup_id: |
| return &bpf_get_current_cgroup_id_proto; |
| case BPF_FUNC_get_current_ancestor_cgroup_id: |
| return &bpf_get_current_ancestor_cgroup_id_proto; |
| #endif |
| #ifdef CONFIG_CGROUP_NET_CLASSID |
| case BPF_FUNC_get_cgroup_classid: |
| return &bpf_get_cgroup_classid_curr_proto; |
| #endif |
| #ifdef CONFIG_INET |
| case BPF_FUNC_sk_lookup_tcp: |
| return &bpf_sock_addr_sk_lookup_tcp_proto; |
| case BPF_FUNC_sk_lookup_udp: |
| return &bpf_sock_addr_sk_lookup_udp_proto; |
| case BPF_FUNC_sk_release: |
| return &bpf_sk_release_proto; |
| case BPF_FUNC_skc_lookup_tcp: |
| return &bpf_sock_addr_skc_lookup_tcp_proto; |
| #endif /* CONFIG_INET */ |
| case BPF_FUNC_sk_storage_get: |
| return &bpf_sk_storage_get_proto; |
| case BPF_FUNC_sk_storage_delete: |
| return &bpf_sk_storage_delete_proto; |
| case BPF_FUNC_setsockopt: |
| switch (prog->expected_attach_type) { |
| case BPF_CGROUP_INET4_CONNECT: |
| case BPF_CGROUP_INET6_CONNECT: |
| return &bpf_sock_addr_setsockopt_proto; |
| default: |
| return NULL; |
| } |
| case BPF_FUNC_getsockopt: |
| switch (prog->expected_attach_type) { |
| case BPF_CGROUP_INET4_CONNECT: |
| case BPF_CGROUP_INET6_CONNECT: |
| return &bpf_sock_addr_getsockopt_proto; |
| default: |
| return NULL; |
| } |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_skb_load_bytes: |
| return &bpf_skb_load_bytes_proto; |
| case BPF_FUNC_skb_load_bytes_relative: |
| return &bpf_skb_load_bytes_relative_proto; |
| case BPF_FUNC_get_socket_cookie: |
| return &bpf_get_socket_cookie_proto; |
| case BPF_FUNC_get_socket_uid: |
| return &bpf_get_socket_uid_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_skb_event_output_proto; |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| const struct bpf_func_proto bpf_sk_storage_get_proto __weak; |
| const struct bpf_func_proto bpf_sk_storage_delete_proto __weak; |
| |
| static const struct bpf_func_proto * |
| cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_get_local_storage: |
| return &bpf_get_local_storage_proto; |
| case BPF_FUNC_sk_fullsock: |
| return &bpf_sk_fullsock_proto; |
| case BPF_FUNC_sk_storage_get: |
| return &bpf_sk_storage_get_proto; |
| case BPF_FUNC_sk_storage_delete: |
| return &bpf_sk_storage_delete_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_skb_event_output_proto; |
| #ifdef CONFIG_SOCK_CGROUP_DATA |
| case BPF_FUNC_skb_cgroup_id: |
| return &bpf_skb_cgroup_id_proto; |
| case BPF_FUNC_skb_ancestor_cgroup_id: |
| return &bpf_skb_ancestor_cgroup_id_proto; |
| case BPF_FUNC_sk_cgroup_id: |
| return &bpf_sk_cgroup_id_proto; |
| case BPF_FUNC_sk_ancestor_cgroup_id: |
| return &bpf_sk_ancestor_cgroup_id_proto; |
| #endif |
| #ifdef CONFIG_INET |
| case BPF_FUNC_sk_lookup_tcp: |
| return &bpf_sk_lookup_tcp_proto; |
| case BPF_FUNC_sk_lookup_udp: |
| return &bpf_sk_lookup_udp_proto; |
| case BPF_FUNC_sk_release: |
| return &bpf_sk_release_proto; |
| case BPF_FUNC_skc_lookup_tcp: |
| return &bpf_skc_lookup_tcp_proto; |
| case BPF_FUNC_tcp_sock: |
| return &bpf_tcp_sock_proto; |
| case BPF_FUNC_get_listener_sock: |
| return &bpf_get_listener_sock_proto; |
| case BPF_FUNC_skb_ecn_set_ce: |
| return &bpf_skb_ecn_set_ce_proto; |
| #endif |
| default: |
| return sk_filter_func_proto(func_id, prog); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_skb_store_bytes: |
| return &bpf_skb_store_bytes_proto; |
| case BPF_FUNC_skb_load_bytes: |
| return &bpf_skb_load_bytes_proto; |
| case BPF_FUNC_skb_load_bytes_relative: |
| return &bpf_skb_load_bytes_relative_proto; |
| case BPF_FUNC_skb_pull_data: |
| return &bpf_skb_pull_data_proto; |
| case BPF_FUNC_csum_diff: |
| return &bpf_csum_diff_proto; |
| case BPF_FUNC_csum_update: |
| return &bpf_csum_update_proto; |
| case BPF_FUNC_csum_level: |
| return &bpf_csum_level_proto; |
| case BPF_FUNC_l3_csum_replace: |
| return &bpf_l3_csum_replace_proto; |
| case BPF_FUNC_l4_csum_replace: |
| return &bpf_l4_csum_replace_proto; |
| case BPF_FUNC_clone_redirect: |
| return &bpf_clone_redirect_proto; |
| case BPF_FUNC_get_cgroup_classid: |
| return &bpf_get_cgroup_classid_proto; |
| case BPF_FUNC_skb_vlan_push: |
| return &bpf_skb_vlan_push_proto; |
| case BPF_FUNC_skb_vlan_pop: |
| return &bpf_skb_vlan_pop_proto; |
| case BPF_FUNC_skb_change_proto: |
| return &bpf_skb_change_proto_proto; |
| case BPF_FUNC_skb_change_type: |
| return &bpf_skb_change_type_proto; |
| case BPF_FUNC_skb_adjust_room: |
| return &bpf_skb_adjust_room_proto; |
| case BPF_FUNC_skb_change_tail: |
| return &bpf_skb_change_tail_proto; |
| case BPF_FUNC_skb_change_head: |
| return &bpf_skb_change_head_proto; |
| case BPF_FUNC_skb_get_tunnel_key: |
| return &bpf_skb_get_tunnel_key_proto; |
| case BPF_FUNC_skb_set_tunnel_key: |
| return bpf_get_skb_set_tunnel_proto(func_id); |
| case BPF_FUNC_skb_get_tunnel_opt: |
| return &bpf_skb_get_tunnel_opt_proto; |
| case BPF_FUNC_skb_set_tunnel_opt: |
| return bpf_get_skb_set_tunnel_proto(func_id); |
| case BPF_FUNC_redirect: |
| return &bpf_redirect_proto; |
| case BPF_FUNC_get_route_realm: |
| return &bpf_get_route_realm_proto; |
| case BPF_FUNC_get_hash_recalc: |
| return &bpf_get_hash_recalc_proto; |
| case BPF_FUNC_set_hash_invalid: |
| return &bpf_set_hash_invalid_proto; |
| case BPF_FUNC_set_hash: |
| return &bpf_set_hash_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_skb_event_output_proto; |
| case BPF_FUNC_get_smp_processor_id: |
| return &bpf_get_smp_processor_id_proto; |
| case BPF_FUNC_skb_under_cgroup: |
| return &bpf_skb_under_cgroup_proto; |
| case BPF_FUNC_get_socket_cookie: |
| return &bpf_get_socket_cookie_proto; |
| case BPF_FUNC_get_socket_uid: |
| return &bpf_get_socket_uid_proto; |
| case BPF_FUNC_fib_lookup: |
| return &bpf_skb_fib_lookup_proto; |
| case BPF_FUNC_sk_fullsock: |
| return &bpf_sk_fullsock_proto; |
| case BPF_FUNC_sk_storage_get: |
| return &bpf_sk_storage_get_proto; |
| case BPF_FUNC_sk_storage_delete: |
| return &bpf_sk_storage_delete_proto; |
| #ifdef CONFIG_XFRM |
| case BPF_FUNC_skb_get_xfrm_state: |
| return &bpf_skb_get_xfrm_state_proto; |
| #endif |
| #ifdef CONFIG_SOCK_CGROUP_DATA |
| case BPF_FUNC_skb_cgroup_id: |
| return &bpf_skb_cgroup_id_proto; |
| case BPF_FUNC_skb_ancestor_cgroup_id: |
| return &bpf_skb_ancestor_cgroup_id_proto; |
| #endif |
| #ifdef CONFIG_INET |
| case BPF_FUNC_sk_lookup_tcp: |
| return &bpf_sk_lookup_tcp_proto; |
| case BPF_FUNC_sk_lookup_udp: |
| return &bpf_sk_lookup_udp_proto; |
| case BPF_FUNC_sk_release: |
| return &bpf_sk_release_proto; |
| case BPF_FUNC_tcp_sock: |
| return &bpf_tcp_sock_proto; |
| case BPF_FUNC_get_listener_sock: |
| return &bpf_get_listener_sock_proto; |
| case BPF_FUNC_skc_lookup_tcp: |
| return &bpf_skc_lookup_tcp_proto; |
| case BPF_FUNC_tcp_check_syncookie: |
| return &bpf_tcp_check_syncookie_proto; |
| case BPF_FUNC_skb_ecn_set_ce: |
| return &bpf_skb_ecn_set_ce_proto; |
| case BPF_FUNC_tcp_gen_syncookie: |
| return &bpf_tcp_gen_syncookie_proto; |
| case BPF_FUNC_sk_assign: |
| return &bpf_sk_assign_proto; |
| #endif |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_perf_event_output: |
| return &bpf_xdp_event_output_proto; |
| case BPF_FUNC_get_smp_processor_id: |
| return &bpf_get_smp_processor_id_proto; |
| case BPF_FUNC_csum_diff: |
| return &bpf_csum_diff_proto; |
| case BPF_FUNC_xdp_adjust_head: |
| return &bpf_xdp_adjust_head_proto; |
| case BPF_FUNC_xdp_adjust_meta: |
| return &bpf_xdp_adjust_meta_proto; |
| case BPF_FUNC_redirect: |
| return &bpf_xdp_redirect_proto; |
| case BPF_FUNC_redirect_map: |
| return &bpf_xdp_redirect_map_proto; |
| case BPF_FUNC_xdp_adjust_tail: |
| return &bpf_xdp_adjust_tail_proto; |
| case BPF_FUNC_fib_lookup: |
| return &bpf_xdp_fib_lookup_proto; |
| #ifdef CONFIG_INET |
| case BPF_FUNC_sk_lookup_udp: |
| return &bpf_xdp_sk_lookup_udp_proto; |
| case BPF_FUNC_sk_lookup_tcp: |
| return &bpf_xdp_sk_lookup_tcp_proto; |
| case BPF_FUNC_sk_release: |
| return &bpf_sk_release_proto; |
| case BPF_FUNC_skc_lookup_tcp: |
| return &bpf_xdp_skc_lookup_tcp_proto; |
| case BPF_FUNC_tcp_check_syncookie: |
| return &bpf_tcp_check_syncookie_proto; |
| case BPF_FUNC_tcp_gen_syncookie: |
| return &bpf_tcp_gen_syncookie_proto; |
| #endif |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| const struct bpf_func_proto bpf_sock_map_update_proto __weak; |
| const struct bpf_func_proto bpf_sock_hash_update_proto __weak; |
| |
| static const struct bpf_func_proto * |
| sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_setsockopt: |
| return &bpf_sock_ops_setsockopt_proto; |
| case BPF_FUNC_getsockopt: |
| return &bpf_sock_ops_getsockopt_proto; |
| case BPF_FUNC_sock_ops_cb_flags_set: |
| return &bpf_sock_ops_cb_flags_set_proto; |
| case BPF_FUNC_sock_map_update: |
| return &bpf_sock_map_update_proto; |
| case BPF_FUNC_sock_hash_update: |
| return &bpf_sock_hash_update_proto; |
| case BPF_FUNC_get_socket_cookie: |
| return &bpf_get_socket_cookie_sock_ops_proto; |
| case BPF_FUNC_get_local_storage: |
| return &bpf_get_local_storage_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_event_output_data_proto; |
| case BPF_FUNC_sk_storage_get: |
| return &bpf_sk_storage_get_proto; |
| case BPF_FUNC_sk_storage_delete: |
| return &bpf_sk_storage_delete_proto; |
| #ifdef CONFIG_INET |
| case BPF_FUNC_tcp_sock: |
| return &bpf_tcp_sock_proto; |
| #endif /* CONFIG_INET */ |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| const struct bpf_func_proto bpf_msg_redirect_map_proto __weak; |
| const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak; |
| |
| static const struct bpf_func_proto * |
| sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_msg_redirect_map: |
| return &bpf_msg_redirect_map_proto; |
| case BPF_FUNC_msg_redirect_hash: |
| return &bpf_msg_redirect_hash_proto; |
| case BPF_FUNC_msg_apply_bytes: |
| return &bpf_msg_apply_bytes_proto; |
| case BPF_FUNC_msg_cork_bytes: |
| return &bpf_msg_cork_bytes_proto; |
| case BPF_FUNC_msg_pull_data: |
| return &bpf_msg_pull_data_proto; |
| case BPF_FUNC_msg_push_data: |
| return &bpf_msg_push_data_proto; |
| case BPF_FUNC_msg_pop_data: |
| return &bpf_msg_pop_data_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_event_output_data_proto; |
| case BPF_FUNC_get_current_uid_gid: |
| return &bpf_get_current_uid_gid_proto; |
| case BPF_FUNC_get_current_pid_tgid: |
| return &bpf_get_current_pid_tgid_proto; |
| case BPF_FUNC_sk_storage_get: |
| return &bpf_sk_storage_get_proto; |
| case BPF_FUNC_sk_storage_delete: |
| return &bpf_sk_storage_delete_proto; |
| #ifdef CONFIG_CGROUPS |
| case BPF_FUNC_get_current_cgroup_id: |
| return &bpf_get_current_cgroup_id_proto; |
| case BPF_FUNC_get_current_ancestor_cgroup_id: |
| return &bpf_get_current_ancestor_cgroup_id_proto; |
| #endif |
| #ifdef CONFIG_CGROUP_NET_CLASSID |
| case BPF_FUNC_get_cgroup_classid: |
| return &bpf_get_cgroup_classid_curr_proto; |
| #endif |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| const struct bpf_func_proto bpf_sk_redirect_map_proto __weak; |
| const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak; |
| |
| static const struct bpf_func_proto * |
| sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_skb_store_bytes: |
| return &bpf_skb_store_bytes_proto; |
| case BPF_FUNC_skb_load_bytes: |
| return &bpf_skb_load_bytes_proto; |
| case BPF_FUNC_skb_pull_data: |
| return &sk_skb_pull_data_proto; |
| case BPF_FUNC_skb_change_tail: |
| return &sk_skb_change_tail_proto; |
| case BPF_FUNC_skb_change_head: |
| return &sk_skb_change_head_proto; |
| case BPF_FUNC_get_socket_cookie: |
| return &bpf_get_socket_cookie_proto; |
| case BPF_FUNC_get_socket_uid: |
| return &bpf_get_socket_uid_proto; |
| case BPF_FUNC_sk_redirect_map: |
| return &bpf_sk_redirect_map_proto; |
| case BPF_FUNC_sk_redirect_hash: |
| return &bpf_sk_redirect_hash_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_skb_event_output_proto; |
| #ifdef CONFIG_INET |
| case BPF_FUNC_sk_lookup_tcp: |
| return &bpf_sk_lookup_tcp_proto; |
| case BPF_FUNC_sk_lookup_udp: |
| return &bpf_sk_lookup_udp_proto; |
| case BPF_FUNC_sk_release: |
| return &bpf_sk_release_proto; |
| case BPF_FUNC_skc_lookup_tcp: |
| return &bpf_skc_lookup_tcp_proto; |
| #endif |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_skb_load_bytes: |
| return &bpf_flow_dissector_load_bytes_proto; |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_skb_load_bytes: |
| return &bpf_skb_load_bytes_proto; |
| case BPF_FUNC_skb_pull_data: |
| return &bpf_skb_pull_data_proto; |
| case BPF_FUNC_csum_diff: |
| return &bpf_csum_diff_proto; |
| case BPF_FUNC_get_cgroup_classid: |
| return &bpf_get_cgroup_classid_proto; |
| case BPF_FUNC_get_route_realm: |
| return &bpf_get_route_realm_proto; |
| case BPF_FUNC_get_hash_recalc: |
| return &bpf_get_hash_recalc_proto; |
| case BPF_FUNC_perf_event_output: |
| return &bpf_skb_event_output_proto; |
| case BPF_FUNC_get_smp_processor_id: |
| return &bpf_get_smp_processor_id_proto; |
| case BPF_FUNC_skb_under_cgroup: |
| return &bpf_skb_under_cgroup_proto; |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_lwt_push_encap: |
| return &bpf_lwt_in_push_encap_proto; |
| default: |
| return lwt_out_func_proto(func_id, prog); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_skb_get_tunnel_key: |
| return &bpf_skb_get_tunnel_key_proto; |
| case BPF_FUNC_skb_set_tunnel_key: |
| return bpf_get_skb_set_tunnel_proto(func_id); |
| case BPF_FUNC_skb_get_tunnel_opt: |
| return &bpf_skb_get_tunnel_opt_proto; |
| case BPF_FUNC_skb_set_tunnel_opt: |
| return bpf_get_skb_set_tunnel_proto(func_id); |
| case BPF_FUNC_redirect: |
| return &bpf_redirect_proto; |
| case BPF_FUNC_clone_redirect: |
| return &bpf_clone_redirect_proto; |
| case BPF_FUNC_skb_change_tail: |
| return &bpf_skb_change_tail_proto; |
| case BPF_FUNC_skb_change_head: |
| return &bpf_skb_change_head_proto; |
| case BPF_FUNC_skb_store_bytes: |
| return &bpf_skb_store_bytes_proto; |
| case BPF_FUNC_csum_update: |
| return &bpf_csum_update_proto; |
| case BPF_FUNC_csum_level: |
| return &bpf_csum_level_proto; |
| case BPF_FUNC_l3_csum_replace: |
| return &bpf_l3_csum_replace_proto; |
| case BPF_FUNC_l4_csum_replace: |
| return &bpf_l4_csum_replace_proto; |
| case BPF_FUNC_set_hash_invalid: |
| return &bpf_set_hash_invalid_proto; |
| case BPF_FUNC_lwt_push_encap: |
| return &bpf_lwt_xmit_push_encap_proto; |
| default: |
| return lwt_out_func_proto(func_id, prog); |
| } |
| } |
| |
| static const struct bpf_func_proto * |
| lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF) |
| case BPF_FUNC_lwt_seg6_store_bytes: |
| return &bpf_lwt_seg6_store_bytes_proto; |
| case BPF_FUNC_lwt_seg6_action: |
| return &bpf_lwt_seg6_action_proto; |
| case BPF_FUNC_lwt_seg6_adjust_srh: |
| return &bpf_lwt_seg6_adjust_srh_proto; |
| #endif |
| default: |
| return lwt_out_func_proto(func_id, prog); |
| } |
| } |
| |
| static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| const int size_default = sizeof(__u32); |
| |
| if (off < 0 || off >= sizeof(struct __sk_buff)) |
| return false; |
| |
| /* The verifier guarantees that size > 0. */ |
| if (off % size != 0) |
| return false; |
| |
| switch (off) { |
| case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
| if (off + size > offsetofend(struct __sk_buff, cb[4])) |
| return false; |
| break; |
| case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]): |
| case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]): |
| case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4): |
| case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4): |
| case bpf_ctx_range(struct __sk_buff, data): |
| case bpf_ctx_range(struct __sk_buff, data_meta): |
| case bpf_ctx_range(struct __sk_buff, data_end): |
| if (size != size_default) |
| return false; |
| break; |
| case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
| return false; |
| case bpf_ctx_range(struct __sk_buff, tstamp): |
| if (size != sizeof(__u64)) |
| return false; |
| break; |
| case offsetof(struct __sk_buff, sk): |
| if (type == BPF_WRITE || size != sizeof(__u64)) |
| return false; |
| info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL; |
| break; |
| default: |
| /* Only narrow read access allowed for now. */ |
| if (type == BPF_WRITE) { |
| if (size != size_default) |
| return false; |
| } else { |
| bpf_ctx_record_field_size(info, size_default); |
| if (!bpf_ctx_narrow_access_ok(off, size, size_default)) |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| static bool sk_filter_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, tc_classid): |
| case bpf_ctx_range(struct __sk_buff, data): |
| case bpf_ctx_range(struct __sk_buff, data_meta): |
| case bpf_ctx_range(struct __sk_buff, data_end): |
| case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
| case bpf_ctx_range(struct __sk_buff, tstamp): |
| case bpf_ctx_range(struct __sk_buff, wire_len): |
| return false; |
| } |
| |
| if (type == BPF_WRITE) { |
| switch (off) { |
| case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
| break; |
| default: |
| return false; |
| } |
| } |
| |
| return bpf_skb_is_valid_access(off, size, type, prog, info); |
| } |
| |
| static bool cg_skb_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, tc_classid): |
| case bpf_ctx_range(struct __sk_buff, data_meta): |
| case bpf_ctx_range(struct __sk_buff, wire_len): |
| return false; |
| case bpf_ctx_range(struct __sk_buff, data): |
| case bpf_ctx_range(struct __sk_buff, data_end): |
| if (!bpf_capable()) |
| return false; |
| break; |
| } |
| |
| if (type == BPF_WRITE) { |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, mark): |
| case bpf_ctx_range(struct __sk_buff, priority): |
| case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
| break; |
| case bpf_ctx_range(struct __sk_buff, tstamp): |
| if (!bpf_capable()) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| } |
| |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, data): |
| info->reg_type = PTR_TO_PACKET; |
| break; |
| case bpf_ctx_range(struct __sk_buff, data_end): |
| info->reg_type = PTR_TO_PACKET_END; |
| break; |
| } |
| |
| return bpf_skb_is_valid_access(off, size, type, prog, info); |
| } |
| |
| static bool lwt_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, tc_classid): |
| case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
| case bpf_ctx_range(struct __sk_buff, data_meta): |
| case bpf_ctx_range(struct __sk_buff, tstamp): |
| case bpf_ctx_range(struct __sk_buff, wire_len): |
| return false; |
| } |
| |
| if (type == BPF_WRITE) { |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, mark): |
| case bpf_ctx_range(struct __sk_buff, priority): |
| case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
| break; |
| default: |
| return false; |
| } |
| } |
| |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, data): |
| info->reg_type = PTR_TO_PACKET; |
| break; |
| case bpf_ctx_range(struct __sk_buff, data_end): |
| info->reg_type = PTR_TO_PACKET_END; |
| break; |
| } |
| |
| return bpf_skb_is_valid_access(off, size, type, prog, info); |
| } |
| |
| /* Attach type specific accesses */ |
| static bool __sock_filter_check_attach_type(int off, |
| enum bpf_access_type access_type, |
| enum bpf_attach_type attach_type) |
| { |
| switch (off) { |
| case offsetof(struct bpf_sock, bound_dev_if): |
| case offsetof(struct bpf_sock, mark): |
| case offsetof(struct bpf_sock, priority): |
| switch (attach_type) { |
| case BPF_CGROUP_INET_SOCK_CREATE: |
| case BPF_CGROUP_INET_SOCK_RELEASE: |
| goto full_access; |
| default: |
| return false; |
| } |
| case bpf_ctx_range(struct bpf_sock, src_ip4): |
| switch (attach_type) { |
| case BPF_CGROUP_INET4_POST_BIND: |
| goto read_only; |
| default: |
| return false; |
| } |
| case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): |
| switch (attach_type) { |
| case BPF_CGROUP_INET6_POST_BIND: |
| goto read_only; |
| default: |
| return false; |
| } |
| case bpf_ctx_range(struct bpf_sock, src_port): |
| switch (attach_type) { |
| case BPF_CGROUP_INET4_POST_BIND: |
| case BPF_CGROUP_INET6_POST_BIND: |
| goto read_only; |
| default: |
| return false; |
| } |
| } |
| read_only: |
| return access_type == BPF_READ; |
| full_access: |
| return true; |
| } |
| |
| bool bpf_sock_common_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| struct bpf_insn_access_aux *info) |
| { |
| switch (off) { |
| case bpf_ctx_range_till(struct bpf_sock, type, priority): |
| return false; |
| default: |
| return bpf_sock_is_valid_access(off, size, type, info); |
| } |
| } |
| |
| bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type, |
| struct bpf_insn_access_aux *info) |
| { |
| const int size_default = sizeof(__u32); |
| |
| if (off < 0 || off >= sizeof(struct bpf_sock)) |
| return false; |
| if (off % size != 0) |
| return false; |
| |
| switch (off) { |
| case offsetof(struct bpf_sock, state): |
| case offsetof(struct bpf_sock, family): |
| case offsetof(struct bpf_sock, type): |
| case offsetof(struct bpf_sock, protocol): |
| case offsetof(struct bpf_sock, dst_port): |
| case offsetof(struct bpf_sock, src_port): |
| case offsetof(struct bpf_sock, rx_queue_mapping): |
| case bpf_ctx_range(struct bpf_sock, src_ip4): |
| case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): |
| case bpf_ctx_range(struct bpf_sock, dst_ip4): |
| case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): |
| bpf_ctx_record_field_size(info, size_default); |
| return bpf_ctx_narrow_access_ok(off, size, size_default); |
| } |
| |
| return size == size_default; |
| } |
| |
| static bool sock_filter_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| if (!bpf_sock_is_valid_access(off, size, type, info)) |
| return false; |
| return __sock_filter_check_attach_type(off, type, |
| prog->expected_attach_type); |
| } |
| |
| static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write, |
| const struct bpf_prog *prog) |
| { |
| /* Neither direct read nor direct write requires any preliminary |
| * action. |
| */ |
| return 0; |
| } |
| |
| static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write, |
| const struct bpf_prog *prog, int drop_verdict) |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| if (!direct_write) |
| return 0; |
| |
| /* if (!skb->cloned) |
| * goto start; |
| * |
| * (Fast-path, otherwise approximation that we might be |
| * a clone, do the rest in helper.) |
| */ |
| *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET()); |
| *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK); |
| *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7); |
| |
| /* ret = bpf_skb_pull_data(skb, 0); */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1); |
| *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2); |
| *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, |
| BPF_FUNC_skb_pull_data); |
| /* if (!ret) |
| * goto restore; |
| * return TC_ACT_SHOT; |
| */ |
| *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2); |
| *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict); |
| *insn++ = BPF_EXIT_INSN(); |
| |
| /* restore: */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6); |
| /* start: */ |
| *insn++ = prog->insnsi[0]; |
| |
| return insn - insn_buf; |
| } |
| |
| static int bpf_gen_ld_abs(const struct bpf_insn *orig, |
| struct bpf_insn *insn_buf) |
| { |
| bool indirect = BPF_MODE(orig->code) == BPF_IND; |
| struct bpf_insn *insn = insn_buf; |
| |
| /* We're guaranteed here that CTX is in R6. */ |
| *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX); |
| if (!indirect) { |
| *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm); |
| } else { |
| *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg); |
| if (orig->imm) |
| *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm); |
| } |
| |
| switch (BPF_SIZE(orig->code)) { |
| case BPF_B: |
| *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache); |
| break; |
| case BPF_H: |
| *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache); |
| break; |
| case BPF_W: |
| *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache); |
| break; |
| } |
| |
| *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2); |
| *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0); |
| *insn++ = BPF_EXIT_INSN(); |
| |
| return insn - insn_buf; |
| } |
| |
| static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write, |
| const struct bpf_prog *prog) |
| { |
| return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT); |
| } |
| |
| static bool tc_cls_act_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| if (type == BPF_WRITE) { |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, mark): |
| case bpf_ctx_range(struct __sk_buff, tc_index): |
| case bpf_ctx_range(struct __sk_buff, priority): |
| case bpf_ctx_range(struct __sk_buff, tc_classid): |
| case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]): |
| case bpf_ctx_range(struct __sk_buff, tstamp): |
| case bpf_ctx_range(struct __sk_buff, queue_mapping): |
| break; |
| default: |
| return false; |
| } |
| } |
| |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, data): |
| info->reg_type = PTR_TO_PACKET; |
| break; |
| case bpf_ctx_range(struct __sk_buff, data_meta): |
| info->reg_type = PTR_TO_PACKET_META; |
| break; |
| case bpf_ctx_range(struct __sk_buff, data_end): |
| info->reg_type = PTR_TO_PACKET_END; |
| break; |
| case bpf_ctx_range_till(struct __sk_buff, family, local_port): |
| return false; |
| } |
| |
| return bpf_skb_is_valid_access(off, size, type, prog, info); |
| } |
| |
| static bool __is_valid_xdp_access(int off, int size) |
| { |
| if (off < 0 || off >= sizeof(struct xdp_md)) |
| return false; |
| if (off % size != 0) |
| return false; |
| if (size != sizeof(__u32)) |
| return false; |
| |
| return true; |
| } |
| |
| static bool xdp_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| if (prog->expected_attach_type != BPF_XDP_DEVMAP) { |
| switch (off) { |
| case offsetof(struct xdp_md, egress_ifindex): |
| return false; |
| } |
| } |
| |
| if (type == BPF_WRITE) { |
| if (bpf_prog_is_dev_bound(prog->aux)) { |
| switch (off) { |
| case offsetof(struct xdp_md, rx_queue_index): |
| return __is_valid_xdp_access(off, size); |
| } |
| } |
| return false; |
| } |
| |
| switch (off) { |
| case offsetof(struct xdp_md, data): |
| info->reg_type = PTR_TO_PACKET; |
| break; |
| case offsetof(struct xdp_md, data_meta): |
| info->reg_type = PTR_TO_PACKET_META; |
| break; |
| case offsetof(struct xdp_md, data_end): |
| info->reg_type = PTR_TO_PACKET_END; |
| break; |
| } |
| |
| return __is_valid_xdp_access(off, size); |
| } |
| |
| void bpf_warn_invalid_xdp_action(u32 act) |
| { |
| const u32 act_max = XDP_REDIRECT; |
| |
| WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n", |
| act > act_max ? "Illegal" : "Driver unsupported", |
| act); |
| } |
| EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action); |
| |
| static bool sock_addr_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| const int size_default = sizeof(__u32); |
| |
| if (off < 0 || off >= sizeof(struct bpf_sock_addr)) |
| return false; |
| if (off % size != 0) |
| return false; |
| |
| /* Disallow access to IPv6 fields from IPv4 contex and vise |
| * versa. |
| */ |
| switch (off) { |
| case bpf_ctx_range(struct bpf_sock_addr, user_ip4): |
| switch (prog->expected_attach_type) { |
| case BPF_CGROUP_INET4_BIND: |
| case BPF_CGROUP_INET4_CONNECT: |
| case BPF_CGROUP_INET4_GETPEERNAME: |
| case BPF_CGROUP_INET4_GETSOCKNAME: |
| case BPF_CGROUP_UDP4_SENDMSG: |
| case BPF_CGROUP_UDP4_RECVMSG: |
| break; |
| default: |
| return false; |
| } |
| break; |
| case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): |
| switch (prog->expected_attach_type) { |
| case BPF_CGROUP_INET6_BIND: |
| case BPF_CGROUP_INET6_CONNECT: |
| case BPF_CGROUP_INET6_GETPEERNAME: |
| case BPF_CGROUP_INET6_GETSOCKNAME: |
| case BPF_CGROUP_UDP6_SENDMSG: |
| case BPF_CGROUP_UDP6_RECVMSG: |
| break; |
| default: |
| return false; |
| } |
| break; |
| case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): |
| switch (prog->expected_attach_type) { |
| case BPF_CGROUP_UDP4_SENDMSG: |
| break; |
| default: |
| return false; |
| } |
| break; |
| case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], |
| msg_src_ip6[3]): |
| switch (prog->expected_attach_type) { |
| case BPF_CGROUP_UDP6_SENDMSG: |
| break; |
| default: |
| return false; |
| } |
| break; |
| } |
| |
| switch (off) { |
| case bpf_ctx_range(struct bpf_sock_addr, user_ip4): |
| case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): |
| case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4): |
| case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], |
| msg_src_ip6[3]): |
| case bpf_ctx_range(struct bpf_sock_addr, user_port): |
| if (type == BPF_READ) { |
| bpf_ctx_record_field_size(info, size_default); |
| |
| if (bpf_ctx_wide_access_ok(off, size, |
| struct bpf_sock_addr, |
| user_ip6)) |
| return true; |
| |
| if (bpf_ctx_wide_access_ok(off, size, |
| struct bpf_sock_addr, |
| msg_src_ip6)) |
| return true; |
| |
| if (!bpf_ctx_narrow_access_ok(off, size, size_default)) |
| return false; |
| } else { |
| if (bpf_ctx_wide_access_ok(off, size, |
| struct bpf_sock_addr, |
| user_ip6)) |
| return true; |
| |
| if (bpf_ctx_wide_access_ok(off, size, |
| struct bpf_sock_addr, |
| msg_src_ip6)) |
| return true; |
| |
| if (size != size_default) |
| return false; |
| } |
| break; |
| case offsetof(struct bpf_sock_addr, sk): |
| if (type != BPF_READ) |
| return false; |
| if (size != sizeof(__u64)) |
| return false; |
| info->reg_type = PTR_TO_SOCKET; |
| break; |
| default: |
| if (type == BPF_READ) { |
| if (size != size_default) |
| return false; |
| } else { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| static bool sock_ops_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| const int size_default = sizeof(__u32); |
| |
| if (off < 0 || off >= sizeof(struct bpf_sock_ops)) |
| return false; |
| |
| /* The verifier guarantees that size > 0. */ |
| if (off % size != 0) |
| return false; |
| |
| if (type == BPF_WRITE) { |
| switch (off) { |
| case offsetof(struct bpf_sock_ops, reply): |
| case offsetof(struct bpf_sock_ops, sk_txhash): |
| if (size != size_default) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| } else { |
| switch (off) { |
| case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received, |
| bytes_acked): |
| if (size != sizeof(__u64)) |
| return false; |
| break; |
| case offsetof(struct bpf_sock_ops, sk): |
| if (size != sizeof(__u64)) |
| return false; |
| info->reg_type = PTR_TO_SOCKET_OR_NULL; |
| break; |
| default: |
| if (size != size_default) |
| return false; |
| break; |
| } |
| } |
| |
| return true; |
| } |
| |
| static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write, |
| const struct bpf_prog *prog) |
| { |
| return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP); |
| } |
| |
| static bool sk_skb_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, tc_classid): |
| case bpf_ctx_range(struct __sk_buff, data_meta): |
| case bpf_ctx_range(struct __sk_buff, tstamp): |
| case bpf_ctx_range(struct __sk_buff, wire_len): |
| return false; |
| } |
| |
| if (type == BPF_WRITE) { |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, tc_index): |
| case bpf_ctx_range(struct __sk_buff, priority): |
| break; |
| default: |
| return false; |
| } |
| } |
| |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, mark): |
| return false; |
| case bpf_ctx_range(struct __sk_buff, data): |
| info->reg_type = PTR_TO_PACKET; |
| break; |
| case bpf_ctx_range(struct __sk_buff, data_end): |
| info->reg_type = PTR_TO_PACKET_END; |
| break; |
| } |
| |
| return bpf_skb_is_valid_access(off, size, type, prog, info); |
| } |
| |
| static bool sk_msg_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| if (type == BPF_WRITE) |
| return false; |
| |
| if (off % size != 0) |
| return false; |
| |
| switch (off) { |
| case offsetof(struct sk_msg_md, data): |
| info->reg_type = PTR_TO_PACKET; |
| if (size != sizeof(__u64)) |
| return false; |
| break; |
| case offsetof(struct sk_msg_md, data_end): |
| info->reg_type = PTR_TO_PACKET_END; |
| if (size != sizeof(__u64)) |
| return false; |
| break; |
| case offsetof(struct sk_msg_md, sk): |
| if (size != sizeof(__u64)) |
| return false; |
| info->reg_type = PTR_TO_SOCKET; |
| break; |
| case bpf_ctx_range(struct sk_msg_md, family): |
| case bpf_ctx_range(struct sk_msg_md, remote_ip4): |
| case bpf_ctx_range(struct sk_msg_md, local_ip4): |
| case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]): |
| case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]): |
| case bpf_ctx_range(struct sk_msg_md, remote_port): |
| case bpf_ctx_range(struct sk_msg_md, local_port): |
| case bpf_ctx_range(struct sk_msg_md, size): |
| if (size != sizeof(__u32)) |
| return false; |
| break; |
| default: |
| return false; |
| } |
| return true; |
| } |
| |
| static bool flow_dissector_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| const int size_default = sizeof(__u32); |
| |
| if (off < 0 || off >= sizeof(struct __sk_buff)) |
| return false; |
| |
| if (type == BPF_WRITE) |
| return false; |
| |
| switch (off) { |
| case bpf_ctx_range(struct __sk_buff, data): |
| if (size != size_default) |
| return false; |
| info->reg_type = PTR_TO_PACKET; |
| return true; |
| case bpf_ctx_range(struct __sk_buff, data_end): |
| if (size != size_default) |
| return false; |
| info->reg_type = PTR_TO_PACKET_END; |
| return true; |
| case bpf_ctx_range_ptr(struct __sk_buff, flow_keys): |
| if (size != sizeof(__u64)) |
| return false; |
| info->reg_type = PTR_TO_FLOW_KEYS; |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, |
| u32 *target_size) |
| |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| switch (si->off) { |
| case offsetof(struct __sk_buff, data): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_flow_dissector, data)); |
| break; |
| |
| case offsetof(struct __sk_buff, data_end): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_flow_dissector, data_end)); |
| break; |
| |
| case offsetof(struct __sk_buff, flow_keys): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_flow_dissector, flow_keys)); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| static struct bpf_insn *bpf_convert_shinfo_access(const struct bpf_insn *si, |
| struct bpf_insn *insn) |
| { |
| /* si->dst_reg = skb_shinfo(SKB); */ |
| #ifdef NET_SKBUFF_DATA_USES_OFFSET |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), |
| BPF_REG_AX, si->src_reg, |
| offsetof(struct sk_buff, end)); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, head)); |
| *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX); |
| #else |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, end)); |
| #endif |
| |
| return insn; |
| } |
| |
| static u32 bpf_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| int off; |
| |
| switch (si->off) { |
| case offsetof(struct __sk_buff, len): |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, len, 4, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, protocol): |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, protocol, 2, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, vlan_proto): |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, vlan_proto, 2, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, priority): |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, priority, 4, |
| target_size)); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, priority, 4, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, ingress_ifindex): |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, skb_iif, 4, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, ifindex): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, dev)); |
| *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| bpf_target_off(struct net_device, ifindex, 4, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, hash): |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, hash, 4, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, mark): |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, mark, 4, |
| target_size)); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, mark, 4, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, pkt_type): |
| *target_size = 1; |
| *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, |
| PKT_TYPE_OFFSET()); |
| *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX); |
| #ifdef __BIG_ENDIAN_BITFIELD |
| *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5); |
| #endif |
| break; |
| |
| case offsetof(struct __sk_buff, queue_mapping): |
| if (type == BPF_WRITE) { |
| *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1); |
| *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, |
| queue_mapping, |
| 2, target_size)); |
| } else { |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, |
| queue_mapping, |
| 2, target_size)); |
| } |
| break; |
| |
| case offsetof(struct __sk_buff, vlan_present): |
| *target_size = 1; |
| *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg, |
| PKT_VLAN_PRESENT_OFFSET()); |
| if (PKT_VLAN_PRESENT_BIT) |
| *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT); |
| if (PKT_VLAN_PRESENT_BIT < 7) |
| *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1); |
| break; |
| |
| case offsetof(struct __sk_buff, vlan_tci): |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, vlan_tci, 2, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, cb[0]) ... |
| offsetofend(struct __sk_buff, cb[4]) - 1: |
| BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20); |
| BUILD_BUG_ON((offsetof(struct sk_buff, cb) + |
| offsetof(struct qdisc_skb_cb, data)) % |
| sizeof(__u64)); |
| |
| prog->cb_access = 1; |
| off = si->off; |
| off -= offsetof(struct __sk_buff, cb[0]); |
| off += offsetof(struct sk_buff, cb); |
| off += offsetof(struct qdisc_skb_cb, data); |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg, |
| si->src_reg, off); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg, |
| si->src_reg, off); |
| break; |
| |
| case offsetof(struct __sk_buff, tc_classid): |
| BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2); |
| |
| off = si->off; |
| off -= offsetof(struct __sk_buff, tc_classid); |
| off += offsetof(struct sk_buff, cb); |
| off += offsetof(struct qdisc_skb_cb, tc_classid); |
| *target_size = 2; |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, |
| si->src_reg, off); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, |
| si->src_reg, off); |
| break; |
| |
| case offsetof(struct __sk_buff, data): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, data)); |
| break; |
| |
| case offsetof(struct __sk_buff, data_meta): |
| off = si->off; |
| off -= offsetof(struct __sk_buff, data_meta); |
| off += offsetof(struct sk_buff, cb); |
| off += offsetof(struct bpf_skb_data_end, data_meta); |
| *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, |
| si->src_reg, off); |
| break; |
| |
| case offsetof(struct __sk_buff, data_end): |
| off = si->off; |
| off -= offsetof(struct __sk_buff, data_end); |
| off += offsetof(struct sk_buff, cb); |
| off += offsetof(struct bpf_skb_data_end, data_end); |
| *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, |
| si->src_reg, off); |
| break; |
| |
| case offsetof(struct __sk_buff, tc_index): |
| #ifdef CONFIG_NET_SCHED |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, tc_index, 2, |
| target_size)); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, tc_index, 2, |
| target_size)); |
| #else |
| *target_size = 2; |
| if (type == BPF_WRITE) |
| *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg); |
| else |
| *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| |
| case offsetof(struct __sk_buff, napi_id): |
| #if defined(CONFIG_NET_RX_BUSY_POLL) |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, napi_id, 4, |
| target_size)); |
| *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1); |
| *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
| #else |
| *target_size = 4; |
| *insn++ = BPF_MOV64_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| case offsetof(struct __sk_buff, family): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| bpf_target_off(struct sock_common, |
| skc_family, |
| 2, target_size)); |
| break; |
| case offsetof(struct __sk_buff, remote_ip4): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| bpf_target_off(struct sock_common, |
| skc_daddr, |
| 4, target_size)); |
| break; |
| case offsetof(struct __sk_buff, local_ip4): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_rcv_saddr) != 4); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| bpf_target_off(struct sock_common, |
| skc_rcv_saddr, |
| 4, target_size)); |
| break; |
| case offsetof(struct __sk_buff, remote_ip6[0]) ... |
| offsetof(struct __sk_buff, remote_ip6[3]): |
| #if IS_ENABLED(CONFIG_IPV6) |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_v6_daddr.s6_addr32[0]) != 4); |
| |
| off = si->off; |
| off -= offsetof(struct __sk_buff, remote_ip6[0]); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, |
| skc_v6_daddr.s6_addr32[0]) + |
| off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| case offsetof(struct __sk_buff, local_ip6[0]) ... |
| offsetof(struct __sk_buff, local_ip6[3]): |
| #if IS_ENABLED(CONFIG_IPV6) |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_v6_rcv_saddr.s6_addr32[0]) != 4); |
| |
| off = si->off; |
| off -= offsetof(struct __sk_buff, local_ip6[0]); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, |
| skc_v6_rcv_saddr.s6_addr32[0]) + |
| off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| |
| case offsetof(struct __sk_buff, remote_port): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| bpf_target_off(struct sock_common, |
| skc_dport, |
| 2, target_size)); |
| #ifndef __BIG_ENDIAN_BITFIELD |
| *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); |
| #endif |
| break; |
| |
| case offsetof(struct __sk_buff, local_port): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| bpf_target_off(struct sock_common, |
| skc_num, 2, target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, tstamp): |
| BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8); |
| |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_DW, |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, |
| tstamp, 8, |
| target_size)); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_DW, |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sk_buff, |
| tstamp, 8, |
| target_size)); |
| break; |
| |
| case offsetof(struct __sk_buff, gso_segs): |
| insn = bpf_convert_shinfo_access(si, insn); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs), |
| si->dst_reg, si->dst_reg, |
| bpf_target_off(struct skb_shared_info, |
| gso_segs, 2, |
| target_size)); |
| break; |
| case offsetof(struct __sk_buff, gso_size): |
| insn = bpf_convert_shinfo_access(si, insn); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size), |
| si->dst_reg, si->dst_reg, |
| bpf_target_off(struct skb_shared_info, |
| gso_size, 2, |
| target_size)); |
| break; |
| case offsetof(struct __sk_buff, wire_len): |
| BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4); |
| |
| off = si->off; |
| off -= offsetof(struct __sk_buff, wire_len); |
| off += offsetof(struct sk_buff, cb); |
| off += offsetof(struct qdisc_skb_cb, pkt_len); |
| *target_size = 4; |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off); |
| break; |
| |
| case offsetof(struct __sk_buff, sk): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, sk)); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| u32 bpf_sock_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| int off; |
| |
| switch (si->off) { |
| case offsetof(struct bpf_sock, bound_dev_if): |
| BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4); |
| |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| offsetof(struct sock, sk_bound_dev_if)); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| offsetof(struct sock, sk_bound_dev_if)); |
| break; |
| |
| case offsetof(struct bpf_sock, mark): |
| BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4); |
| |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| offsetof(struct sock, sk_mark)); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| offsetof(struct sock, sk_mark)); |
| break; |
| |
| case offsetof(struct bpf_sock, priority): |
| BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4); |
| |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| offsetof(struct sock, sk_priority)); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| offsetof(struct sock, sk_priority)); |
| break; |
| |
| case offsetof(struct bpf_sock, family): |
| *insn++ = BPF_LDX_MEM( |
| BPF_FIELD_SIZEOF(struct sock_common, skc_family), |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock_common, |
| skc_family, |
| sizeof_field(struct sock_common, |
| skc_family), |
| target_size)); |
| break; |
| |
| case offsetof(struct bpf_sock, type): |
| *insn++ = BPF_LDX_MEM( |
| BPF_FIELD_SIZEOF(struct sock, sk_type), |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock, sk_type, |
| sizeof_field(struct sock, sk_type), |
| target_size)); |
| break; |
| |
| case offsetof(struct bpf_sock, protocol): |
| *insn++ = BPF_LDX_MEM( |
| BPF_FIELD_SIZEOF(struct sock, sk_protocol), |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock, sk_protocol, |
| sizeof_field(struct sock, sk_protocol), |
| target_size)); |
| break; |
| |
| case offsetof(struct bpf_sock, src_ip4): |
| *insn++ = BPF_LDX_MEM( |
| BPF_SIZE(si->code), si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock_common, skc_rcv_saddr, |
| sizeof_field(struct sock_common, |
| skc_rcv_saddr), |
| target_size)); |
| break; |
| |
| case offsetof(struct bpf_sock, dst_ip4): |
| *insn++ = BPF_LDX_MEM( |
| BPF_SIZE(si->code), si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock_common, skc_daddr, |
| sizeof_field(struct sock_common, |
| skc_daddr), |
| target_size)); |
| break; |
| |
| case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]): |
| #if IS_ENABLED(CONFIG_IPV6) |
| off = si->off; |
| off -= offsetof(struct bpf_sock, src_ip6[0]); |
| *insn++ = BPF_LDX_MEM( |
| BPF_SIZE(si->code), si->dst_reg, si->src_reg, |
| bpf_target_off( |
| struct sock_common, |
| skc_v6_rcv_saddr.s6_addr32[0], |
| sizeof_field(struct sock_common, |
| skc_v6_rcv_saddr.s6_addr32[0]), |
| target_size) + off); |
| #else |
| (void)off; |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| |
| case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]): |
| #if IS_ENABLED(CONFIG_IPV6) |
| off = si->off; |
| off -= offsetof(struct bpf_sock, dst_ip6[0]); |
| *insn++ = BPF_LDX_MEM( |
| BPF_SIZE(si->code), si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock_common, |
| skc_v6_daddr.s6_addr32[0], |
| sizeof_field(struct sock_common, |
| skc_v6_daddr.s6_addr32[0]), |
| target_size) + off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| *target_size = 4; |
| #endif |
| break; |
| |
| case offsetof(struct bpf_sock, src_port): |
| *insn++ = BPF_LDX_MEM( |
| BPF_FIELD_SIZEOF(struct sock_common, skc_num), |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock_common, skc_num, |
| sizeof_field(struct sock_common, |
| skc_num), |
| target_size)); |
| break; |
| |
| case offsetof(struct bpf_sock, dst_port): |
| *insn++ = BPF_LDX_MEM( |
| BPF_FIELD_SIZEOF(struct sock_common, skc_dport), |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock_common, skc_dport, |
| sizeof_field(struct sock_common, |
| skc_dport), |
| target_size)); |
| break; |
| |
| case offsetof(struct bpf_sock, state): |
| *insn++ = BPF_LDX_MEM( |
| BPF_FIELD_SIZEOF(struct sock_common, skc_state), |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock_common, skc_state, |
| sizeof_field(struct sock_common, |
| skc_state), |
| target_size)); |
| break; |
| case offsetof(struct bpf_sock, rx_queue_mapping): |
| #ifdef CONFIG_XPS |
| *insn++ = BPF_LDX_MEM( |
| BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping), |
| si->dst_reg, si->src_reg, |
| bpf_target_off(struct sock, sk_rx_queue_mapping, |
| sizeof_field(struct sock, |
| sk_rx_queue_mapping), |
| target_size)); |
| *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING, |
| 1); |
| *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); |
| #else |
| *insn++ = BPF_MOV64_IMM(si->dst_reg, -1); |
| *target_size = 2; |
| #endif |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| switch (si->off) { |
| case offsetof(struct __sk_buff, ifindex): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_buff, dev)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| bpf_target_off(struct net_device, ifindex, 4, |
| target_size)); |
| break; |
| default: |
| return bpf_convert_ctx_access(type, si, insn_buf, prog, |
| target_size); |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| static u32 xdp_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| switch (si->off) { |
| case offsetof(struct xdp_md, data): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data), |
| si->dst_reg, si->src_reg, |
| offsetof(struct xdp_buff, data)); |
| break; |
| case offsetof(struct xdp_md, data_meta): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta), |
| si->dst_reg, si->src_reg, |
| offsetof(struct xdp_buff, data_meta)); |
| break; |
| case offsetof(struct xdp_md, data_end): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end), |
| si->dst_reg, si->src_reg, |
| offsetof(struct xdp_buff, data_end)); |
| break; |
| case offsetof(struct xdp_md, ingress_ifindex): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), |
| si->dst_reg, si->src_reg, |
| offsetof(struct xdp_buff, rxq)); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev), |
| si->dst_reg, si->dst_reg, |
| offsetof(struct xdp_rxq_info, dev)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct net_device, ifindex)); |
| break; |
| case offsetof(struct xdp_md, rx_queue_index): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq), |
| si->dst_reg, si->src_reg, |
| offsetof(struct xdp_buff, rxq)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct xdp_rxq_info, |
| queue_index)); |
| break; |
| case offsetof(struct xdp_md, egress_ifindex): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq), |
| si->dst_reg, si->src_reg, |
| offsetof(struct xdp_buff, txq)); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev), |
| si->dst_reg, si->dst_reg, |
| offsetof(struct xdp_txq_info, dev)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct net_device, ifindex)); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of |
| * context Structure, F is Field in context structure that contains a pointer |
| * to Nested Structure of type NS that has the field NF. |
| * |
| * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make |
| * sure that SIZE is not greater than actual size of S.F.NF. |
| * |
| * If offset OFF is provided, the load happens from that offset relative to |
| * offset of NF. |
| */ |
| #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF) \ |
| do { \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg, \ |
| si->src_reg, offsetof(S, F)); \ |
| *insn++ = BPF_LDX_MEM( \ |
| SIZE, si->dst_reg, si->dst_reg, \ |
| bpf_target_off(NS, NF, sizeof_field(NS, NF), \ |
| target_size) \ |
| + OFF); \ |
| } while (0) |
| |
| #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF) \ |
| SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, \ |
| BPF_FIELD_SIZEOF(NS, NF), 0) |
| |
| /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to |
| * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation. |
| * |
| * In addition it uses Temporary Field TF (member of struct S) as the 3rd |
| * "register" since two registers available in convert_ctx_access are not |
| * enough: we can't override neither SRC, since it contains value to store, nor |
| * DST since it contains pointer to context that may be used by later |
| * instructions. But we need a temporary place to save pointer to nested |
| * structure whose field we want to store to. |
| */ |
| #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF) \ |
| do { \ |
| int tmp_reg = BPF_REG_9; \ |
| if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ |
| --tmp_reg; \ |
| if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg) \ |
| --tmp_reg; \ |
| *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg, \ |
| offsetof(S, TF)); \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg, \ |
| si->dst_reg, offsetof(S, F)); \ |
| *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg, \ |
| bpf_target_off(NS, NF, sizeof_field(NS, NF), \ |
| target_size) \ |
| + OFF); \ |
| *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg, \ |
| offsetof(S, TF)); \ |
| } while (0) |
| |
| #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \ |
| TF) \ |
| do { \ |
| if (type == BPF_WRITE) { \ |
| SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, \ |
| OFF, TF); \ |
| } else { \ |
| SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF( \ |
| S, NS, F, NF, SIZE, OFF); \ |
| } \ |
| } while (0) |
| |
| #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF) \ |
| SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( \ |
| S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF) |
| |
| static u32 sock_addr_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port); |
| struct bpf_insn *insn = insn_buf; |
| |
| switch (si->off) { |
| case offsetof(struct bpf_sock_addr, user_family): |
| SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, |
| struct sockaddr, uaddr, sa_family); |
| break; |
| |
| case offsetof(struct bpf_sock_addr, user_ip4): |
| SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( |
| struct bpf_sock_addr_kern, struct sockaddr_in, uaddr, |
| sin_addr, BPF_SIZE(si->code), 0, tmp_reg); |
| break; |
| |
| case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]): |
| off = si->off; |
| off -= offsetof(struct bpf_sock_addr, user_ip6[0]); |
| SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( |
| struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, |
| sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off, |
| tmp_reg); |
| break; |
| |
| case offsetof(struct bpf_sock_addr, user_port): |
| /* To get port we need to know sa_family first and then treat |
| * sockaddr as either sockaddr_in or sockaddr_in6. |
| * Though we can simplify since port field has same offset and |
| * size in both structures. |
| * Here we check this invariant and use just one of the |
| * structures if it's true. |
| */ |
| BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) != |
| offsetof(struct sockaddr_in6, sin6_port)); |
| BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) != |
| sizeof_field(struct sockaddr_in6, sin6_port)); |
| /* Account for sin6_port being smaller than user_port. */ |
| port_size = min(port_size, BPF_LDST_BYTES(si)); |
| SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( |
| struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr, |
| sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg); |
| break; |
| |
| case offsetof(struct bpf_sock_addr, family): |
| SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, |
| struct sock, sk, sk_family); |
| break; |
| |
| case offsetof(struct bpf_sock_addr, type): |
| SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, |
| struct sock, sk, sk_type); |
| break; |
| |
| case offsetof(struct bpf_sock_addr, protocol): |
| SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern, |
| struct sock, sk, sk_protocol); |
| break; |
| |
| case offsetof(struct bpf_sock_addr, msg_src_ip4): |
| /* Treat t_ctx as struct in_addr for msg_src_ip4. */ |
| SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( |
| struct bpf_sock_addr_kern, struct in_addr, t_ctx, |
| s_addr, BPF_SIZE(si->code), 0, tmp_reg); |
| break; |
| |
| case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0], |
| msg_src_ip6[3]): |
| off = si->off; |
| off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]); |
| /* Treat t_ctx as struct in6_addr for msg_src_ip6. */ |
| SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF( |
| struct bpf_sock_addr_kern, struct in6_addr, t_ctx, |
| s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg); |
| break; |
| case offsetof(struct bpf_sock_addr, sk): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_addr_kern, sk)); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| static u32 sock_ops_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, |
| u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| int off; |
| |
| /* Helper macro for adding read access to tcp_sock or sock fields. */ |
| #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ |
| do { \ |
| int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2; \ |
| BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ |
| sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ |
| if (si->dst_reg == reg || si->src_reg == reg) \ |
| reg--; \ |
| if (si->dst_reg == reg || si->src_reg == reg) \ |
| reg--; \ |
| if (si->dst_reg == si->src_reg) { \ |
| *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| temp)); \ |
| fullsock_reg = reg; \ |
| jmp += 2; \ |
| } \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
| struct bpf_sock_ops_kern, \ |
| is_fullsock), \ |
| fullsock_reg, si->src_reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| is_fullsock)); \ |
| *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ |
| if (si->dst_reg == si->src_reg) \ |
| *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| temp)); \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
| struct bpf_sock_ops_kern, sk),\ |
| si->dst_reg, si->src_reg, \ |
| offsetof(struct bpf_sock_ops_kern, sk));\ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ, \ |
| OBJ_FIELD), \ |
| si->dst_reg, si->dst_reg, \ |
| offsetof(OBJ, OBJ_FIELD)); \ |
| if (si->dst_reg == si->src_reg) { \ |
| *insn++ = BPF_JMP_A(1); \ |
| *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| temp)); \ |
| } \ |
| } while (0) |
| |
| #define SOCK_OPS_GET_SK() \ |
| do { \ |
| int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1; \ |
| if (si->dst_reg == reg || si->src_reg == reg) \ |
| reg--; \ |
| if (si->dst_reg == reg || si->src_reg == reg) \ |
| reg--; \ |
| if (si->dst_reg == si->src_reg) { \ |
| *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| temp)); \ |
| fullsock_reg = reg; \ |
| jmp += 2; \ |
| } \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
| struct bpf_sock_ops_kern, \ |
| is_fullsock), \ |
| fullsock_reg, si->src_reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| is_fullsock)); \ |
| *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp); \ |
| if (si->dst_reg == si->src_reg) \ |
| *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| temp)); \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
| struct bpf_sock_ops_kern, sk),\ |
| si->dst_reg, si->src_reg, \ |
| offsetof(struct bpf_sock_ops_kern, sk));\ |
| if (si->dst_reg == si->src_reg) { \ |
| *insn++ = BPF_JMP_A(1); \ |
| *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| temp)); \ |
| } \ |
| } while (0) |
| |
| #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \ |
| SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock) |
| |
| /* Helper macro for adding write access to tcp_sock or sock fields. |
| * The macro is called with two registers, dst_reg which contains a pointer |
| * to ctx (context) and src_reg which contains the value that should be |
| * stored. However, we need an additional register since we cannot overwrite |
| * dst_reg because it may be used later in the program. |
| * Instead we "borrow" one of the other register. We first save its value |
| * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore |
| * it at the end of the macro. |
| */ |
| #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ) \ |
| do { \ |
| int reg = BPF_REG_9; \ |
| BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) > \ |
| sizeof_field(struct bpf_sock_ops, BPF_FIELD)); \ |
| if (si->dst_reg == reg || si->src_reg == reg) \ |
| reg--; \ |
| if (si->dst_reg == reg || si->src_reg == reg) \ |
| reg--; \ |
| *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| temp)); \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
| struct bpf_sock_ops_kern, \ |
| is_fullsock), \ |
| reg, si->dst_reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| is_fullsock)); \ |
| *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2); \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( \ |
| struct bpf_sock_ops_kern, sk),\ |
| reg, si->dst_reg, \ |
| offsetof(struct bpf_sock_ops_kern, sk));\ |
| *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD), \ |
| reg, si->src_reg, \ |
| offsetof(OBJ, OBJ_FIELD)); \ |
| *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg, \ |
| offsetof(struct bpf_sock_ops_kern, \ |
| temp)); \ |
| } while (0) |
| |
| #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE) \ |
| do { \ |
| if (TYPE == BPF_WRITE) \ |
| SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ |
| else \ |
| SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ); \ |
| } while (0) |
| |
| if (insn > insn_buf) |
| return insn - insn_buf; |
| |
| switch (si->off) { |
| case offsetof(struct bpf_sock_ops, op) ... |
| offsetof(struct bpf_sock_ops, replylong[3]): |
| BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, op) != |
| sizeof_field(struct bpf_sock_ops_kern, op)); |
| BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) != |
| sizeof_field(struct bpf_sock_ops_kern, reply)); |
| BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) != |
| sizeof_field(struct bpf_sock_ops_kern, replylong)); |
| off = si->off; |
| off -= offsetof(struct bpf_sock_ops, op); |
| off += offsetof(struct bpf_sock_ops_kern, op); |
| if (type == BPF_WRITE) |
| *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| off); |
| else |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| off); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, family): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_family)); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, remote_ip4): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_daddr)); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, local_ip4): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_rcv_saddr) != 4); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, |
| skc_rcv_saddr)); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, remote_ip6[0]) ... |
| offsetof(struct bpf_sock_ops, remote_ip6[3]): |
| #if IS_ENABLED(CONFIG_IPV6) |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_v6_daddr.s6_addr32[0]) != 4); |
| |
| off = si->off; |
| off -= offsetof(struct bpf_sock_ops, remote_ip6[0]); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, |
| skc_v6_daddr.s6_addr32[0]) + |
| off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| |
| case offsetof(struct bpf_sock_ops, local_ip6[0]) ... |
| offsetof(struct bpf_sock_ops, local_ip6[3]): |
| #if IS_ENABLED(CONFIG_IPV6) |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_v6_rcv_saddr.s6_addr32[0]) != 4); |
| |
| off = si->off; |
| off -= offsetof(struct bpf_sock_ops, local_ip6[0]); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, |
| skc_v6_rcv_saddr.s6_addr32[0]) + |
| off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| |
| case offsetof(struct bpf_sock_ops, remote_port): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_dport)); |
| #ifndef __BIG_ENDIAN_BITFIELD |
| *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); |
| #endif |
| break; |
| |
| case offsetof(struct bpf_sock_ops, local_port): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_num)); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, is_fullsock): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, |
| is_fullsock), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, |
| is_fullsock)); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, state): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_state)); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, rtt_min): |
| BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) != |
| sizeof(struct minmax)); |
| BUILD_BUG_ON(sizeof(struct minmax) < |
| sizeof(struct minmax_sample)); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct bpf_sock_ops_kern, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sock_ops_kern, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct tcp_sock, rtt_min) + |
| sizeof_field(struct minmax_sample, t)); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags): |
| SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags, |
| struct tcp_sock); |
| break; |
| |
| case offsetof(struct bpf_sock_ops, sk_txhash): |
| SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash, |
| struct sock, type); |
| break; |
| case offsetof(struct bpf_sock_ops, snd_cwnd): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd); |
| break; |
| case offsetof(struct bpf_sock_ops, srtt_us): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us); |
| break; |
| case offsetof(struct bpf_sock_ops, snd_ssthresh): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh); |
| break; |
| case offsetof(struct bpf_sock_ops, rcv_nxt): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt); |
| break; |
| case offsetof(struct bpf_sock_ops, snd_nxt): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt); |
| break; |
| case offsetof(struct bpf_sock_ops, snd_una): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una); |
| break; |
| case offsetof(struct bpf_sock_ops, mss_cache): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache); |
| break; |
| case offsetof(struct bpf_sock_ops, ecn_flags): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags); |
| break; |
| case offsetof(struct bpf_sock_ops, rate_delivered): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered); |
| break; |
| case offsetof(struct bpf_sock_ops, rate_interval_us): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us); |
| break; |
| case offsetof(struct bpf_sock_ops, packets_out): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out); |
| break; |
| case offsetof(struct bpf_sock_ops, retrans_out): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out); |
| break; |
| case offsetof(struct bpf_sock_ops, total_retrans): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans); |
| break; |
| case offsetof(struct bpf_sock_ops, segs_in): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in); |
| break; |
| case offsetof(struct bpf_sock_ops, data_segs_in): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in); |
| break; |
| case offsetof(struct bpf_sock_ops, segs_out): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out); |
| break; |
| case offsetof(struct bpf_sock_ops, data_segs_out): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out); |
| break; |
| case offsetof(struct bpf_sock_ops, lost_out): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out); |
| break; |
| case offsetof(struct bpf_sock_ops, sacked_out): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out); |
| break; |
| case offsetof(struct bpf_sock_ops, bytes_received): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received); |
| break; |
| case offsetof(struct bpf_sock_ops, bytes_acked): |
| SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked); |
| break; |
| case offsetof(struct bpf_sock_ops, sk): |
| SOCK_OPS_GET_SK(); |
| break; |
| } |
| return insn - insn_buf; |
| } |
| |
| static u32 sk_skb_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| int off; |
| |
| switch (si->off) { |
| case offsetof(struct __sk_buff, data_end): |
| off = si->off; |
| off -= offsetof(struct __sk_buff, data_end); |
| off += offsetof(struct sk_buff, cb); |
| off += offsetof(struct tcp_skb_cb, bpf.data_end); |
| *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, |
| si->src_reg, off); |
| break; |
| default: |
| return bpf_convert_ctx_access(type, si, insn_buf, prog, |
| target_size); |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| static u32 sk_msg_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| #if IS_ENABLED(CONFIG_IPV6) |
| int off; |
| #endif |
| |
| /* convert ctx uses the fact sg element is first in struct */ |
| BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0); |
| |
| switch (si->off) { |
| case offsetof(struct sk_msg_md, data): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, data)); |
| break; |
| case offsetof(struct sk_msg_md, data_end): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, data_end)); |
| break; |
| case offsetof(struct sk_msg_md, family): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct sk_msg, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_family)); |
| break; |
| |
| case offsetof(struct sk_msg_md, remote_ip4): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct sk_msg, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_daddr)); |
| break; |
| |
| case offsetof(struct sk_msg_md, local_ip4): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_rcv_saddr) != 4); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct sk_msg, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, |
| skc_rcv_saddr)); |
| break; |
| |
| case offsetof(struct sk_msg_md, remote_ip6[0]) ... |
| offsetof(struct sk_msg_md, remote_ip6[3]): |
| #if IS_ENABLED(CONFIG_IPV6) |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_v6_daddr.s6_addr32[0]) != 4); |
| |
| off = si->off; |
| off -= offsetof(struct sk_msg_md, remote_ip6[0]); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct sk_msg, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, |
| skc_v6_daddr.s6_addr32[0]) + |
| off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| |
| case offsetof(struct sk_msg_md, local_ip6[0]) ... |
| offsetof(struct sk_msg_md, local_ip6[3]): |
| #if IS_ENABLED(CONFIG_IPV6) |
| BUILD_BUG_ON(sizeof_field(struct sock_common, |
| skc_v6_rcv_saddr.s6_addr32[0]) != 4); |
| |
| off = si->off; |
| off -= offsetof(struct sk_msg_md, local_ip6[0]); |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct sk_msg, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, |
| skc_v6_rcv_saddr.s6_addr32[0]) + |
| off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| |
| case offsetof(struct sk_msg_md, remote_port): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct sk_msg, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_dport)); |
| #ifndef __BIG_ENDIAN_BITFIELD |
| *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16); |
| #endif |
| break; |
| |
| case offsetof(struct sk_msg_md, local_port): |
| BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2); |
| |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF( |
| struct sk_msg, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, sk)); |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg, |
| offsetof(struct sock_common, skc_num)); |
| break; |
| |
| case offsetof(struct sk_msg_md, size): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg_sg, size)); |
| break; |
| |
| case offsetof(struct sk_msg_md, sk): |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk), |
| si->dst_reg, si->src_reg, |
| offsetof(struct sk_msg, sk)); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| const struct bpf_verifier_ops sk_filter_verifier_ops = { |
| .get_func_proto = sk_filter_func_proto, |
| .is_valid_access = sk_filter_is_valid_access, |
| .convert_ctx_access = bpf_convert_ctx_access, |
| .gen_ld_abs = bpf_gen_ld_abs, |
| }; |
| |
| const struct bpf_prog_ops sk_filter_prog_ops = { |
| .test_run = bpf_prog_test_run_skb, |
| }; |
| |
| const struct bpf_verifier_ops tc_cls_act_verifier_ops = { |
| .get_func_proto = tc_cls_act_func_proto, |
| .is_valid_access = tc_cls_act_is_valid_access, |
| .convert_ctx_access = tc_cls_act_convert_ctx_access, |
| .gen_prologue = tc_cls_act_prologue, |
| .gen_ld_abs = bpf_gen_ld_abs, |
| }; |
| |
| const struct bpf_prog_ops tc_cls_act_prog_ops = { |
| .test_run = bpf_prog_test_run_skb, |
| }; |
| |
| const struct bpf_verifier_ops xdp_verifier_ops = { |
| .get_func_proto = xdp_func_proto, |
| .is_valid_access = xdp_is_valid_access, |
| .convert_ctx_access = xdp_convert_ctx_access, |
| .gen_prologue = bpf_noop_prologue, |
| }; |
| |
| const struct bpf_prog_ops xdp_prog_ops = { |
| .test_run = bpf_prog_test_run_xdp, |
| }; |
| |
| const struct bpf_verifier_ops cg_skb_verifier_ops = { |
| .get_func_proto = cg_skb_func_proto, |
| .is_valid_access = cg_skb_is_valid_access, |
| .convert_ctx_access = bpf_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops cg_skb_prog_ops = { |
| .test_run = bpf_prog_test_run_skb, |
| }; |
| |
| const struct bpf_verifier_ops lwt_in_verifier_ops = { |
| .get_func_proto = lwt_in_func_proto, |
| .is_valid_access = lwt_is_valid_access, |
| .convert_ctx_access = bpf_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops lwt_in_prog_ops = { |
| .test_run = bpf_prog_test_run_skb, |
| }; |
| |
| const struct bpf_verifier_ops lwt_out_verifier_ops = { |
| .get_func_proto = lwt_out_func_proto, |
| .is_valid_access = lwt_is_valid_access, |
| .convert_ctx_access = bpf_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops lwt_out_prog_ops = { |
| .test_run = bpf_prog_test_run_skb, |
| }; |
| |
| const struct bpf_verifier_ops lwt_xmit_verifier_ops = { |
| .get_func_proto = lwt_xmit_func_proto, |
| .is_valid_access = lwt_is_valid_access, |
| .convert_ctx_access = bpf_convert_ctx_access, |
| .gen_prologue = tc_cls_act_prologue, |
| }; |
| |
| const struct bpf_prog_ops lwt_xmit_prog_ops = { |
| .test_run = bpf_prog_test_run_skb, |
| }; |
| |
| const struct bpf_verifier_ops lwt_seg6local_verifier_ops = { |
| .get_func_proto = lwt_seg6local_func_proto, |
| .is_valid_access = lwt_is_valid_access, |
| .convert_ctx_access = bpf_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops lwt_seg6local_prog_ops = { |
| .test_run = bpf_prog_test_run_skb, |
| }; |
| |
| const struct bpf_verifier_ops cg_sock_verifier_ops = { |
| .get_func_proto = sock_filter_func_proto, |
| .is_valid_access = sock_filter_is_valid_access, |
| .convert_ctx_access = bpf_sock_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops cg_sock_prog_ops = { |
| }; |
| |
| const struct bpf_verifier_ops cg_sock_addr_verifier_ops = { |
| .get_func_proto = sock_addr_func_proto, |
| .is_valid_access = sock_addr_is_valid_access, |
| .convert_ctx_access = sock_addr_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops cg_sock_addr_prog_ops = { |
| }; |
| |
| const struct bpf_verifier_ops sock_ops_verifier_ops = { |
| .get_func_proto = sock_ops_func_proto, |
| .is_valid_access = sock_ops_is_valid_access, |
| .convert_ctx_access = sock_ops_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops sock_ops_prog_ops = { |
| }; |
| |
| const struct bpf_verifier_ops sk_skb_verifier_ops = { |
| .get_func_proto = sk_skb_func_proto, |
| .is_valid_access = sk_skb_is_valid_access, |
| .convert_ctx_access = sk_skb_convert_ctx_access, |
| .gen_prologue = sk_skb_prologue, |
| }; |
| |
| const struct bpf_prog_ops sk_skb_prog_ops = { |
| }; |
| |
| const struct bpf_verifier_ops sk_msg_verifier_ops = { |
| .get_func_proto = sk_msg_func_proto, |
| .is_valid_access = sk_msg_is_valid_access, |
| .convert_ctx_access = sk_msg_convert_ctx_access, |
| .gen_prologue = bpf_noop_prologue, |
| }; |
| |
| const struct bpf_prog_ops sk_msg_prog_ops = { |
| }; |
| |
| const struct bpf_verifier_ops flow_dissector_verifier_ops = { |
| .get_func_proto = flow_dissector_func_proto, |
| .is_valid_access = flow_dissector_is_valid_access, |
| .convert_ctx_access = flow_dissector_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops flow_dissector_prog_ops = { |
| .test_run = bpf_prog_test_run_flow_dissector, |
| }; |
| |
| int sk_detach_filter(struct sock *sk) |
| { |
| int ret = -ENOENT; |
| struct sk_filter *filter; |
| |
| if (sock_flag(sk, SOCK_FILTER_LOCKED)) |
| return -EPERM; |
| |
| filter = rcu_dereference_protected(sk->sk_filter, |
| lockdep_sock_is_held(sk)); |
| if (filter) { |
| RCU_INIT_POINTER(sk->sk_filter, NULL); |
| sk_filter_uncharge(sk, filter); |
| ret = 0; |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(sk_detach_filter); |
| |
| int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf, |
| unsigned int len) |
| { |
| struct sock_fprog_kern *fprog; |
| struct sk_filter *filter; |
| int ret = 0; |
| |
| lock_sock(sk); |
| filter = rcu_dereference_protected(sk->sk_filter, |
| lockdep_sock_is_held(sk)); |
| if (!filter) |
| goto out; |
| |
| /* We're copying the filter that has been originally attached, |
| * so no conversion/decode needed anymore. eBPF programs that |
| * have no original program cannot be dumped through this. |
| */ |
| ret = -EACCES; |
| fprog = filter->prog->orig_prog; |
| if (!fprog) |
| goto out; |
| |
| ret = fprog->len; |
| if (!len) |
| /* User space only enquires number of filter blocks. */ |
| goto out; |
| |
| ret = -EINVAL; |
| if (len < fprog->len) |
| goto out; |
| |
| ret = -EFAULT; |
| if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog))) |
| goto out; |
| |
| /* Instead of bytes, the API requests to return the number |
| * of filter blocks. |
| */ |
| ret = fprog->len; |
| out: |
| release_sock(sk); |
| return ret; |
| } |
| |
| #ifdef CONFIG_INET |
| static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern, |
| struct sock_reuseport *reuse, |
| struct sock *sk, struct sk_buff *skb, |
| u32 hash) |
| { |
| reuse_kern->skb = skb; |
| reuse_kern->sk = sk; |
| reuse_kern->selected_sk = NULL; |
| reuse_kern->data_end = skb->data + skb_headlen(skb); |
| reuse_kern->hash = hash; |
| reuse_kern->reuseport_id = reuse->reuseport_id; |
| reuse_kern->bind_inany = reuse->bind_inany; |
| } |
| |
| struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk, |
| struct bpf_prog *prog, struct sk_buff *skb, |
| u32 hash) |
| { |
| struct sk_reuseport_kern reuse_kern; |
| enum sk_action action; |
| |
| bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash); |
| action = BPF_PROG_RUN(prog, &reuse_kern); |
| |
| if (action == SK_PASS) |
| return reuse_kern.selected_sk; |
| else |
| return ERR_PTR(-ECONNREFUSED); |
| } |
| |
| BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern, |
| struct bpf_map *, map, void *, key, u32, flags) |
| { |
| bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY; |
| struct sock_reuseport *reuse; |
| struct sock *selected_sk; |
| |
| selected_sk = map->ops->map_lookup_elem(map, key); |
| if (!selected_sk) |
| return -ENOENT; |
| |
| reuse = rcu_dereference(selected_sk->sk_reuseport_cb); |
| if (!reuse) { |
| /* Lookup in sock_map can return TCP ESTABLISHED sockets. */ |
| if (sk_is_refcounted(selected_sk)) |
| sock_put(selected_sk); |
| |
| /* reuseport_array has only sk with non NULL sk_reuseport_cb. |
| * The only (!reuse) case here is - the sk has already been |
| * unhashed (e.g. by close()), so treat it as -ENOENT. |
| * |
| * Other maps (e.g. sock_map) do not provide this guarantee and |
| * the sk may never be in the reuseport group to begin with. |
| */ |
| return is_sockarray ? -ENOENT : -EINVAL; |
| } |
| |
| if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) { |
| struct sock *sk = reuse_kern->sk; |
| |
| if (sk->sk_protocol != selected_sk->sk_protocol) |
| return -EPROTOTYPE; |
| else if (sk->sk_family != selected_sk->sk_family) |
| return -EAFNOSUPPORT; |
| |
| /* Catch all. Likely bound to a different sockaddr. */ |
| return -EBADFD; |
| } |
| |
| reuse_kern->selected_sk = selected_sk; |
| |
| return 0; |
| } |
| |
| static const struct bpf_func_proto sk_select_reuseport_proto = { |
| .func = sk_select_reuseport, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_CONST_MAP_PTR, |
| .arg3_type = ARG_PTR_TO_MAP_KEY, |
| .arg4_type = ARG_ANYTHING, |
| }; |
| |
| BPF_CALL_4(sk_reuseport_load_bytes, |
| const struct sk_reuseport_kern *, reuse_kern, u32, offset, |
| void *, to, u32, len) |
| { |
| return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len); |
| } |
| |
| static const struct bpf_func_proto sk_reuseport_load_bytes_proto = { |
| .func = sk_reuseport_load_bytes, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg4_type = ARG_CONST_SIZE, |
| }; |
| |
| BPF_CALL_5(sk_reuseport_load_bytes_relative, |
| const struct sk_reuseport_kern *, reuse_kern, u32, offset, |
| void *, to, u32, len, u32, start_header) |
| { |
| return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to, |
| len, start_header); |
| } |
| |
| static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = { |
| .func = sk_reuseport_load_bytes_relative, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_ANYTHING, |
| .arg3_type = ARG_PTR_TO_UNINIT_MEM, |
| .arg4_type = ARG_CONST_SIZE, |
| .arg5_type = ARG_ANYTHING, |
| }; |
| |
| static const struct bpf_func_proto * |
| sk_reuseport_func_proto(enum bpf_func_id func_id, |
| const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_sk_select_reuseport: |
| return &sk_select_reuseport_proto; |
| case BPF_FUNC_skb_load_bytes: |
| return &sk_reuseport_load_bytes_proto; |
| case BPF_FUNC_skb_load_bytes_relative: |
| return &sk_reuseport_load_bytes_relative_proto; |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| static bool |
| sk_reuseport_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| const u32 size_default = sizeof(__u32); |
| |
| if (off < 0 || off >= sizeof(struct sk_reuseport_md) || |
| off % size || type != BPF_READ) |
| return false; |
| |
| switch (off) { |
| case offsetof(struct sk_reuseport_md, data): |
| info->reg_type = PTR_TO_PACKET; |
| return size == sizeof(__u64); |
| |
| case offsetof(struct sk_reuseport_md, data_end): |
| info->reg_type = PTR_TO_PACKET_END; |
| return size == sizeof(__u64); |
| |
| case offsetof(struct sk_reuseport_md, hash): |
| return size == size_default; |
| |
| /* Fields that allow narrowing */ |
| case bpf_ctx_range(struct sk_reuseport_md, eth_protocol): |
| if (size < sizeof_field(struct sk_buff, protocol)) |
| return false; |
| fallthrough; |
| case bpf_ctx_range(struct sk_reuseport_md, ip_protocol): |
| case bpf_ctx_range(struct sk_reuseport_md, bind_inany): |
| case bpf_ctx_range(struct sk_reuseport_md, len): |
| bpf_ctx_record_field_size(info, size_default); |
| return bpf_ctx_narrow_access_ok(off, size, size_default); |
| |
| default: |
| return false; |
| } |
| } |
| |
| #define SK_REUSEPORT_LOAD_FIELD(F) ({ \ |
| *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \ |
| si->dst_reg, si->src_reg, \ |
| bpf_target_off(struct sk_reuseport_kern, F, \ |
| sizeof_field(struct sk_reuseport_kern, F), \ |
| target_size)); \ |
| }) |
| |
| #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD) \ |
| SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ |
| struct sk_buff, \ |
| skb, \ |
| SKB_FIELD) |
| |
| #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD) \ |
| SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern, \ |
| struct sock, \ |
| sk, \ |
| SK_FIELD) |
| |
| static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, |
| u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| switch (si->off) { |
| case offsetof(struct sk_reuseport_md, data): |
| SK_REUSEPORT_LOAD_SKB_FIELD(data); |
| break; |
| |
| case offsetof(struct sk_reuseport_md, len): |
| SK_REUSEPORT_LOAD_SKB_FIELD(len); |
| break; |
| |
| case offsetof(struct sk_reuseport_md, eth_protocol): |
| SK_REUSEPORT_LOAD_SKB_FIELD(protocol); |
| break; |
| |
| case offsetof(struct sk_reuseport_md, ip_protocol): |
| SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol); |
| break; |
| |
| case offsetof(struct sk_reuseport_md, data_end): |
| SK_REUSEPORT_LOAD_FIELD(data_end); |
| break; |
| |
| case offsetof(struct sk_reuseport_md, hash): |
| SK_REUSEPORT_LOAD_FIELD(hash); |
| break; |
| |
| case offsetof(struct sk_reuseport_md, bind_inany): |
| SK_REUSEPORT_LOAD_FIELD(bind_inany); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| const struct bpf_verifier_ops sk_reuseport_verifier_ops = { |
| .get_func_proto = sk_reuseport_func_proto, |
| .is_valid_access = sk_reuseport_is_valid_access, |
| .convert_ctx_access = sk_reuseport_convert_ctx_access, |
| }; |
| |
| const struct bpf_prog_ops sk_reuseport_prog_ops = { |
| }; |
| |
| DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled); |
| EXPORT_SYMBOL(bpf_sk_lookup_enabled); |
| |
| BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx, |
| struct sock *, sk, u64, flags) |
| { |
| if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE | |
| BPF_SK_LOOKUP_F_NO_REUSEPORT))) |
| return -EINVAL; |
| if (unlikely(sk && sk_is_refcounted(sk))) |
| return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */ |
| if (unlikely(sk && sk->sk_state == TCP_ESTABLISHED)) |
| return -ESOCKTNOSUPPORT; /* reject connected sockets */ |
| |
| /* Check if socket is suitable for packet L3/L4 protocol */ |
| if (sk && sk->sk_protocol != ctx->protocol) |
| return -EPROTOTYPE; |
| if (sk && sk->sk_family != ctx->family && |
| (sk->sk_family == AF_INET || ipv6_only_sock(sk))) |
| return -EAFNOSUPPORT; |
| |
| if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE)) |
| return -EEXIST; |
| |
| /* Select socket as lookup result */ |
| ctx->selected_sk = sk; |
| ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT; |
| return 0; |
| } |
| |
| static const struct bpf_func_proto bpf_sk_lookup_assign_proto = { |
| .func = bpf_sk_lookup_assign, |
| .gpl_only = false, |
| .ret_type = RET_INTEGER, |
| .arg1_type = ARG_PTR_TO_CTX, |
| .arg2_type = ARG_PTR_TO_SOCKET_OR_NULL, |
| .arg3_type = ARG_ANYTHING, |
| }; |
| |
| static const struct bpf_func_proto * |
| sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) |
| { |
| switch (func_id) { |
| case BPF_FUNC_perf_event_output: |
| return &bpf_event_output_data_proto; |
| case BPF_FUNC_sk_assign: |
| return &bpf_sk_lookup_assign_proto; |
| case BPF_FUNC_sk_release: |
| return &bpf_sk_release_proto; |
| default: |
| return bpf_base_func_proto(func_id); |
| } |
| } |
| |
| static bool sk_lookup_is_valid_access(int off, int size, |
| enum bpf_access_type type, |
| const struct bpf_prog *prog, |
| struct bpf_insn_access_aux *info) |
| { |
| if (off < 0 || off >= sizeof(struct bpf_sk_lookup)) |
| return false; |
| if (off % size != 0) |
| return false; |
| if (type != BPF_READ) |
| return false; |
| |
| switch (off) { |
| case offsetof(struct bpf_sk_lookup, sk): |
| info->reg_type = PTR_TO_SOCKET_OR_NULL; |
| return size == sizeof(__u64); |
| |
| case bpf_ctx_range(struct bpf_sk_lookup, family): |
| case bpf_ctx_range(struct bpf_sk_lookup, protocol): |
| case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4): |
| case bpf_ctx_range(struct bpf_sk_lookup, local_ip4): |
| case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]): |
| case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]): |
| case bpf_ctx_range(struct bpf_sk_lookup, remote_port): |
| case bpf_ctx_range(struct bpf_sk_lookup, local_port): |
| bpf_ctx_record_field_size(info, sizeof(__u32)); |
| return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32)); |
| |
| default: |
| return false; |
| } |
| } |
| |
| static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type, |
| const struct bpf_insn *si, |
| struct bpf_insn *insn_buf, |
| struct bpf_prog *prog, |
| u32 *target_size) |
| { |
| struct bpf_insn *insn = insn_buf; |
| |
| switch (si->off) { |
| case offsetof(struct bpf_sk_lookup, sk): |
| *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sk_lookup_kern, selected_sk)); |
| break; |
| |
| case offsetof(struct bpf_sk_lookup, family): |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct bpf_sk_lookup_kern, |
| family, 2, target_size)); |
| break; |
| |
| case offsetof(struct bpf_sk_lookup, protocol): |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct bpf_sk_lookup_kern, |
| protocol, 2, target_size)); |
| break; |
| |
| case offsetof(struct bpf_sk_lookup, remote_ip4): |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct bpf_sk_lookup_kern, |
| v4.saddr, 4, target_size)); |
| break; |
| |
| case offsetof(struct bpf_sk_lookup, local_ip4): |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, |
| bpf_target_off(struct bpf_sk_lookup_kern, |
| v4.daddr, 4, target_size)); |
| break; |
| |
| case bpf_ctx_range_till(struct bpf_sk_lookup, |
| remote_ip6[0], remote_ip6[3]): { |
| #if IS_ENABLED(CONFIG_IPV6) |
| int off = si->off; |
| |
| off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]); |
| off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); |
| *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sk_lookup_kern, v6.saddr)); |
| *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| } |
| case bpf_ctx_range_till(struct bpf_sk_lookup, |
| local_ip6[0], local_ip6[3]): { |
| #if IS_ENABLED(CONFIG_IPV6) |
| int off = si->off; |
| |
| off -= offsetof(struct bpf_sk_lookup, local_ip6[0]); |
| off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size); |
| *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg, |
| offsetof(struct bpf_sk_lookup_kern, v6.daddr)); |
| *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1); |
| *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off); |
| #else |
| *insn++ = BPF_MOV32_IMM(si->dst_reg, 0); |
| #endif |
| break; |
| } |
| case offsetof(struct bpf_sk_lookup, remote_port): |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct bpf_sk_lookup_kern, |
| sport, 2, target_size)); |
| break; |
| |
| case offsetof(struct bpf_sk_lookup, local_port): |
| *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg, |
| bpf_target_off(struct bpf_sk_lookup_kern, |
| dport, 2, target_size)); |
| break; |
| } |
| |
| return insn - insn_buf; |
| } |
| |
| const struct bpf_prog_ops sk_lookup_prog_ops = { |
| }; |
| |
| const struct bpf_verifier_ops sk_lookup_verifier_ops = { |
| .get_func_proto = sk_lookup_func_proto, |
| .is_valid_access = sk_lookup_is_valid_access, |
| .convert_ctx_access = sk_lookup_convert_ctx_access, |
| }; |
| |
| #endif /* CONFIG_INET */ |
| |
| DEFINE_BPF_DISPATCHER(xdp) |
| |
| void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog) |
| { |
| bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog); |
| } |
| |
| #ifdef CONFIG_DEBUG_INFO_BTF |
| BTF_ID_LIST_GLOBAL(btf_sock_ids) |
| #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type) |
| BTF_SOCK_TYPE_xxx |
| #undef BTF_SOCK_TYPE |
| #else |
| u32 btf_sock_ids[MAX_BTF_SOCK_TYPE]; |
| #endif |
| |
| static bool check_arg_btf_id(u32 btf_id, u32 arg) |
| { |
| int i; |
| |
| /* only one argument, no need to check arg */ |
| for (i = 0; i < MAX_BTF_SOCK_TYPE; i++) |
| if (btf_sock_ids[i] == btf_id) |
| return true; |
| return false; |
| } |
| |
| BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk) |
| { |
| /* tcp6_sock type is not generated in dwarf and hence btf, |
| * trigger an explicit type generation here. |
| */ |
| BTF_TYPE_EMIT(struct tcp6_sock); |
| if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP && |
| sk->sk_family == AF_INET6) |
| return (unsigned long)sk; |
| |
| return (unsigned long)NULL; |
| } |
| |
| const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = { |
| .func = bpf_skc_to_tcp6_sock, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, |
| .arg1_type = ARG_PTR_TO_BTF_ID, |
| .check_btf_id = check_arg_btf_id, |
| .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP6], |
| }; |
| |
| BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk) |
| { |
| if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP) |
| return (unsigned long)sk; |
| |
| return (unsigned long)NULL; |
| } |
| |
| const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = { |
| .func = bpf_skc_to_tcp_sock, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, |
| .arg1_type = ARG_PTR_TO_BTF_ID, |
| .check_btf_id = check_arg_btf_id, |
| .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP], |
| }; |
| |
| BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk) |
| { |
| #ifdef CONFIG_INET |
| if (sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT) |
| return (unsigned long)sk; |
| #endif |
| |
| #if IS_BUILTIN(CONFIG_IPV6) |
| if (sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT) |
| return (unsigned long)sk; |
| #endif |
| |
| return (unsigned long)NULL; |
| } |
| |
| const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = { |
| .func = bpf_skc_to_tcp_timewait_sock, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, |
| .arg1_type = ARG_PTR_TO_BTF_ID, |
| .check_btf_id = check_arg_btf_id, |
| .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW], |
| }; |
| |
| BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk) |
| { |
| #ifdef CONFIG_INET |
| if (sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV) |
| return (unsigned long)sk; |
| #endif |
| |
| #if IS_BUILTIN(CONFIG_IPV6) |
| if (sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV) |
| return (unsigned long)sk; |
| #endif |
| |
| return (unsigned long)NULL; |
| } |
| |
| const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = { |
| .func = bpf_skc_to_tcp_request_sock, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, |
| .arg1_type = ARG_PTR_TO_BTF_ID, |
| .check_btf_id = check_arg_btf_id, |
| .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ], |
| }; |
| |
| BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk) |
| { |
| /* udp6_sock type is not generated in dwarf and hence btf, |
| * trigger an explicit type generation here. |
| */ |
| BTF_TYPE_EMIT(struct udp6_sock); |
| if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP && |
| sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6) |
| return (unsigned long)sk; |
| |
| return (unsigned long)NULL; |
| } |
| |
| const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = { |
| .func = bpf_skc_to_udp6_sock, |
| .gpl_only = false, |
| .ret_type = RET_PTR_TO_BTF_ID_OR_NULL, |
| .arg1_type = ARG_PTR_TO_BTF_ID, |
| .check_btf_id = check_arg_btf_id, |
| .ret_btf_id = &btf_sock_ids[BTF_SOCK_TYPE_UDP6], |
| }; |