| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * "Ping" sockets |
| * |
| * Based on ipv4/ping.c code. |
| * |
| * Authors: Lorenzo Colitti (IPv6 support) |
| * Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6), |
| * Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32) |
| */ |
| |
| #include <net/addrconf.h> |
| #include <net/ipv6.h> |
| #include <net/ip6_route.h> |
| #include <net/protocol.h> |
| #include <net/udp.h> |
| #include <net/transp_v6.h> |
| #include <linux/proc_fs.h> |
| #include <net/ping.h> |
| |
| /* Compatibility glue so we can support IPv6 when it's compiled as a module */ |
| static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, |
| int *addr_len) |
| { |
| return -EAFNOSUPPORT; |
| } |
| static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, |
| struct sk_buff *skb) |
| { |
| } |
| static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err) |
| { |
| return -EAFNOSUPPORT; |
| } |
| static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
| __be16 port, u32 info, u8 *payload) {} |
| static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, |
| const struct net_device *dev, int strict) |
| { |
| return 0; |
| } |
| |
| static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct icmp6hdr user_icmph; |
| int addr_type; |
| struct in6_addr *daddr; |
| int oif = 0; |
| struct flowi6 fl6; |
| int err; |
| struct dst_entry *dst; |
| struct rt6_info *rt; |
| struct pingfakehdr pfh; |
| struct ipcm6_cookie ipc6; |
| |
| pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); |
| |
| err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph, |
| sizeof(user_icmph)); |
| if (err) |
| return err; |
| |
| if (msg->msg_name) { |
| DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name); |
| if (msg->msg_namelen < sizeof(*u)) |
| return -EINVAL; |
| if (u->sin6_family != AF_INET6) { |
| return -EAFNOSUPPORT; |
| } |
| daddr = &(u->sin6_addr); |
| if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr))) |
| oif = u->sin6_scope_id; |
| } else { |
| if (sk->sk_state != TCP_ESTABLISHED) |
| return -EDESTADDRREQ; |
| daddr = &sk->sk_v6_daddr; |
| } |
| |
| if (!oif) |
| oif = sk->sk_bound_dev_if; |
| |
| if (!oif) |
| oif = np->sticky_pktinfo.ipi6_ifindex; |
| |
| if (!oif && ipv6_addr_is_multicast(daddr)) |
| oif = np->mcast_oif; |
| else if (!oif) |
| oif = np->ucast_oif; |
| |
| addr_type = ipv6_addr_type(daddr); |
| if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) || |
| (addr_type & IPV6_ADDR_MAPPED) || |
| (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if)) |
| return -EINVAL; |
| |
| /* TODO: use ip6_datagram_send_ctl to get options from cmsg */ |
| |
| memset(&fl6, 0, sizeof(fl6)); |
| |
| fl6.flowi6_proto = IPPROTO_ICMPV6; |
| fl6.saddr = np->saddr; |
| fl6.daddr = *daddr; |
| fl6.flowi6_oif = oif; |
| fl6.flowi6_mark = sk->sk_mark; |
| fl6.flowi6_uid = sk->sk_uid; |
| fl6.fl6_icmp_type = user_icmph.icmp6_type; |
| fl6.fl6_icmp_code = user_icmph.icmp6_code; |
| security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
| |
| ipcm6_init_sk(&ipc6, np); |
| fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); |
| |
| dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false); |
| if (IS_ERR(dst)) |
| return PTR_ERR(dst); |
| rt = (struct rt6_info *) dst; |
| |
| if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) |
| fl6.flowi6_oif = np->mcast_oif; |
| else if (!fl6.flowi6_oif) |
| fl6.flowi6_oif = np->ucast_oif; |
| |
| pfh.icmph.type = user_icmph.icmp6_type; |
| pfh.icmph.code = user_icmph.icmp6_code; |
| pfh.icmph.checksum = 0; |
| pfh.icmph.un.echo.id = inet->inet_sport; |
| pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence; |
| pfh.msg = msg; |
| pfh.wcheck = 0; |
| pfh.family = AF_INET6; |
| |
| ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); |
| |
| lock_sock(sk); |
| err = ip6_append_data(sk, ping_getfrag, &pfh, len, |
| 0, &ipc6, &fl6, rt, |
| MSG_DONTWAIT); |
| |
| if (err) { |
| ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev, |
| ICMP6_MIB_OUTERRORS); |
| ip6_flush_pending_frames(sk); |
| } else { |
| icmpv6_push_pending_frames(sk, &fl6, |
| (struct icmp6hdr *)&pfh.icmph, len); |
| } |
| release_sock(sk); |
| |
| dst_release(dst); |
| |
| if (err) |
| return err; |
| |
| return len; |
| } |
| |
| struct proto pingv6_prot = { |
| .name = "PINGv6", |
| .owner = THIS_MODULE, |
| .init = ping_init_sock, |
| .close = ping_close, |
| .connect = ip6_datagram_connect_v6_only, |
| .disconnect = __udp_disconnect, |
| .setsockopt = ipv6_setsockopt, |
| .getsockopt = ipv6_getsockopt, |
| .sendmsg = ping_v6_sendmsg, |
| .recvmsg = ping_recvmsg, |
| .bind = ping_bind, |
| .backlog_rcv = ping_queue_rcv_skb, |
| .hash = ping_hash, |
| .unhash = ping_unhash, |
| .get_port = ping_get_port, |
| .obj_size = sizeof(struct raw6_sock), |
| }; |
| EXPORT_SYMBOL_GPL(pingv6_prot); |
| |
| static struct inet_protosw pingv6_protosw = { |
| .type = SOCK_DGRAM, |
| .protocol = IPPROTO_ICMPV6, |
| .prot = &pingv6_prot, |
| .ops = &inet6_sockraw_ops, |
| .flags = INET_PROTOSW_REUSE, |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos) |
| { |
| return ping_seq_start(seq, pos, AF_INET6); |
| } |
| |
| static int ping_v6_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); |
| } else { |
| int bucket = ((struct ping_iter_state *) seq->private)->bucket; |
| struct inet_sock *inet = inet_sk(v); |
| __u16 srcp = ntohs(inet->inet_sport); |
| __u16 destp = ntohs(inet->inet_dport); |
| ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); |
| } |
| return 0; |
| } |
| |
| static const struct seq_operations ping_v6_seq_ops = { |
| .start = ping_v6_seq_start, |
| .show = ping_v6_seq_show, |
| .next = ping_seq_next, |
| .stop = ping_seq_stop, |
| }; |
| |
| static int __net_init ping_v6_proc_init_net(struct net *net) |
| { |
| if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops, |
| sizeof(struct ping_iter_state))) |
| return -ENOMEM; |
| return 0; |
| } |
| |
| static void __net_exit ping_v6_proc_exit_net(struct net *net) |
| { |
| remove_proc_entry("icmp6", net->proc_net); |
| } |
| |
| static struct pernet_operations ping_v6_net_ops = { |
| .init = ping_v6_proc_init_net, |
| .exit = ping_v6_proc_exit_net, |
| }; |
| #endif |
| |
| int __init pingv6_init(void) |
| { |
| #ifdef CONFIG_PROC_FS |
| int ret = register_pernet_subsys(&ping_v6_net_ops); |
| if (ret) |
| return ret; |
| #endif |
| pingv6_ops.ipv6_recv_error = ipv6_recv_error; |
| pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl; |
| pingv6_ops.ip6_datagram_recv_specific_ctl = |
| ip6_datagram_recv_specific_ctl; |
| pingv6_ops.icmpv6_err_convert = icmpv6_err_convert; |
| pingv6_ops.ipv6_icmp_error = ipv6_icmp_error; |
| pingv6_ops.ipv6_chk_addr = ipv6_chk_addr; |
| return inet6_register_protosw(&pingv6_protosw); |
| } |
| |
| /* This never gets called because it's not possible to unload the ipv6 module, |
| * but just in case. |
| */ |
| void pingv6_exit(void) |
| { |
| pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error; |
| pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl; |
| pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl; |
| pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert; |
| pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error; |
| pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr; |
| #ifdef CONFIG_PROC_FS |
| unregister_pernet_subsys(&ping_v6_net_ops); |
| #endif |
| inet6_unregister_protosw(&pingv6_protosw); |
| } |