| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * common UDP/RAW code |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| */ |
| |
| #include <linux/capability.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/interrupt.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/in6.h> |
| #include <linux/ipv6.h> |
| #include <linux/route.h> |
| #include <linux/slab.h> |
| #include <linux/export.h> |
| |
| #include <net/ipv6.h> |
| #include <net/ndisc.h> |
| #include <net/addrconf.h> |
| #include <net/transp_v6.h> |
| #include <net/ip6_route.h> |
| #include <net/tcp_states.h> |
| #include <net/dsfield.h> |
| #include <net/sock_reuseport.h> |
| |
| #include <linux/errqueue.h> |
| #include <linux/uaccess.h> |
| |
| static bool ipv6_mapped_addr_any(const struct in6_addr *a) |
| { |
| return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); |
| } |
| |
| static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| memset(fl6, 0, sizeof(*fl6)); |
| fl6->flowi6_proto = sk->sk_protocol; |
| fl6->daddr = sk->sk_v6_daddr; |
| fl6->saddr = np->saddr; |
| fl6->flowi6_oif = sk->sk_bound_dev_if; |
| fl6->flowi6_mark = sk->sk_mark; |
| fl6->fl6_dport = inet->inet_dport; |
| fl6->fl6_sport = inet->inet_sport; |
| fl6->flowlabel = np->flow_label; |
| fl6->flowi6_uid = sk->sk_uid; |
| |
| if (!fl6->flowi6_oif) |
| fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; |
| |
| if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) |
| fl6->flowi6_oif = np->mcast_oif; |
| |
| security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); |
| } |
| |
| int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr) |
| { |
| struct ip6_flowlabel *flowlabel = NULL; |
| struct in6_addr *final_p, final; |
| struct ipv6_txoptions *opt; |
| struct dst_entry *dst; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct flowi6 fl6; |
| int err = 0; |
| |
| if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) { |
| flowlabel = fl6_sock_lookup(sk, np->flow_label); |
| if (IS_ERR(flowlabel)) |
| return -EINVAL; |
| } |
| ip6_datagram_flow_key_init(&fl6, sk); |
| |
| rcu_read_lock(); |
| opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); |
| final_p = fl6_update_dst(&fl6, opt, &final); |
| rcu_read_unlock(); |
| |
| dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| goto out; |
| } |
| |
| if (fix_sk_saddr) { |
| if (ipv6_addr_any(&np->saddr)) |
| np->saddr = fl6.saddr; |
| |
| if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
| sk->sk_v6_rcv_saddr = fl6.saddr; |
| inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
| if (sk->sk_prot->rehash) |
| sk->sk_prot->rehash(sk); |
| } |
| } |
| |
| ip6_sk_dst_store_flow(sk, dst, &fl6); |
| |
| out: |
| fl6_sock_release(flowlabel); |
| return err; |
| } |
| |
| void ip6_datagram_release_cb(struct sock *sk) |
| { |
| struct dst_entry *dst; |
| |
| if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) |
| return; |
| |
| rcu_read_lock(); |
| dst = __sk_dst_get(sk); |
| if (!dst || !dst->obsolete || |
| dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) { |
| rcu_read_unlock(); |
| return; |
| } |
| rcu_read_unlock(); |
| |
| ip6_datagram_dst_update(sk, false); |
| } |
| EXPORT_SYMBOL_GPL(ip6_datagram_release_cb); |
| |
| int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, |
| int addr_len) |
| { |
| struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct in6_addr *daddr, old_daddr; |
| __be32 fl6_flowlabel = 0; |
| __be32 old_fl6_flowlabel; |
| __be16 old_dport; |
| int addr_type; |
| int err; |
| |
| if (usin->sin6_family == AF_INET) { |
| if (__ipv6_only_sock(sk)) |
| return -EAFNOSUPPORT; |
| err = __ip4_datagram_connect(sk, uaddr, addr_len); |
| goto ipv4_connected; |
| } |
| |
| if (addr_len < SIN6_LEN_RFC2133) |
| return -EINVAL; |
| |
| if (usin->sin6_family != AF_INET6) |
| return -EAFNOSUPPORT; |
| |
| if (np->sndflow) |
| fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
| |
| if (ipv6_addr_any(&usin->sin6_addr)) { |
| /* |
| * connect to self |
| */ |
| if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) |
| ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), |
| &usin->sin6_addr); |
| else |
| usin->sin6_addr = in6addr_loopback; |
| } |
| |
| addr_type = ipv6_addr_type(&usin->sin6_addr); |
| |
| daddr = &usin->sin6_addr; |
| |
| if (addr_type & IPV6_ADDR_MAPPED) { |
| struct sockaddr_in sin; |
| |
| if (__ipv6_only_sock(sk)) { |
| err = -ENETUNREACH; |
| goto out; |
| } |
| sin.sin_family = AF_INET; |
| sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
| sin.sin_port = usin->sin6_port; |
| |
| err = __ip4_datagram_connect(sk, |
| (struct sockaddr *) &sin, |
| sizeof(sin)); |
| |
| ipv4_connected: |
| if (err) |
| goto out; |
| |
| ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); |
| |
| if (ipv6_addr_any(&np->saddr) || |
| ipv6_mapped_addr_any(&np->saddr)) |
| ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
| |
| if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || |
| ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { |
| ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
| &sk->sk_v6_rcv_saddr); |
| if (sk->sk_prot->rehash) |
| sk->sk_prot->rehash(sk); |
| } |
| |
| goto out; |
| } |
| |
| if (__ipv6_addr_needs_scope_id(addr_type)) { |
| if (addr_len >= sizeof(struct sockaddr_in6) && |
| usin->sin6_scope_id) { |
| if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) { |
| err = -EINVAL; |
| goto out; |
| } |
| sk->sk_bound_dev_if = usin->sin6_scope_id; |
| } |
| |
| if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) |
| sk->sk_bound_dev_if = np->mcast_oif; |
| |
| /* Connect to link-local address requires an interface */ |
| if (!sk->sk_bound_dev_if) { |
| err = -EINVAL; |
| goto out; |
| } |
| } |
| |
| /* save the current peer information before updating it */ |
| old_daddr = sk->sk_v6_daddr; |
| old_fl6_flowlabel = np->flow_label; |
| old_dport = inet->inet_dport; |
| |
| sk->sk_v6_daddr = *daddr; |
| np->flow_label = fl6_flowlabel; |
| inet->inet_dport = usin->sin6_port; |
| |
| /* |
| * Check for a route to destination an obtain the |
| * destination cache for it. |
| */ |
| |
| err = ip6_datagram_dst_update(sk, true); |
| if (err) { |
| /* Restore the socket peer info, to keep it consistent with |
| * the old socket state |
| */ |
| sk->sk_v6_daddr = old_daddr; |
| np->flow_label = old_fl6_flowlabel; |
| inet->inet_dport = old_dport; |
| goto out; |
| } |
| |
| reuseport_has_conns(sk, true); |
| sk->sk_state = TCP_ESTABLISHED; |
| sk_set_txhash(sk); |
| out: |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(__ip6_datagram_connect); |
| |
| int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
| { |
| int res; |
| |
| lock_sock(sk); |
| res = __ip6_datagram_connect(sk, uaddr, addr_len); |
| release_sock(sk); |
| return res; |
| } |
| EXPORT_SYMBOL_GPL(ip6_datagram_connect); |
| |
| int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, |
| int addr_len) |
| { |
| DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); |
| if (sin6->sin6_family != AF_INET6) |
| return -EAFNOSUPPORT; |
| return ip6_datagram_connect(sk, uaddr, addr_len); |
| } |
| EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); |
| |
| void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
| __be16 port, u32 info, u8 *payload) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct icmp6hdr *icmph = icmp6_hdr(skb); |
| struct sock_exterr_skb *serr; |
| |
| if (!np->recverr) |
| return; |
| |
| skb = skb_clone(skb, GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| skb->protocol = htons(ETH_P_IPV6); |
| |
| serr = SKB_EXT_ERR(skb); |
| serr->ee.ee_errno = err; |
| serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; |
| serr->ee.ee_type = icmph->icmp6_type; |
| serr->ee.ee_code = icmph->icmp6_code; |
| serr->ee.ee_pad = 0; |
| serr->ee.ee_info = info; |
| serr->ee.ee_data = 0; |
| serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
| skb_network_header(skb); |
| serr->port = port; |
| |
| __skb_pull(skb, payload - skb->data); |
| skb_reset_transport_header(skb); |
| |
| if (sock_queue_err_skb(sk, skb)) |
| kfree_skb(skb); |
| } |
| |
| void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
| { |
| const struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sock_exterr_skb *serr; |
| struct ipv6hdr *iph; |
| struct sk_buff *skb; |
| |
| if (!np->recverr) |
| return; |
| |
| skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| skb->protocol = htons(ETH_P_IPV6); |
| |
| skb_put(skb, sizeof(struct ipv6hdr)); |
| skb_reset_network_header(skb); |
| iph = ipv6_hdr(skb); |
| iph->daddr = fl6->daddr; |
| ip6_flow_hdr(iph, 0, 0); |
| |
| serr = SKB_EXT_ERR(skb); |
| serr->ee.ee_errno = err; |
| serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; |
| serr->ee.ee_type = 0; |
| serr->ee.ee_code = 0; |
| serr->ee.ee_pad = 0; |
| serr->ee.ee_info = info; |
| serr->ee.ee_data = 0; |
| serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
| serr->port = fl6->fl6_dport; |
| |
| __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
| skb_reset_transport_header(skb); |
| |
| if (sock_queue_err_skb(sk, skb)) |
| kfree_skb(skb); |
| } |
| |
| void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct ipv6hdr *iph; |
| struct sk_buff *skb; |
| struct ip6_mtuinfo *mtu_info; |
| |
| if (!np->rxopt.bits.rxpmtu) |
| return; |
| |
| skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); |
| if (!skb) |
| return; |
| |
| skb_put(skb, sizeof(struct ipv6hdr)); |
| skb_reset_network_header(skb); |
| iph = ipv6_hdr(skb); |
| iph->daddr = fl6->daddr; |
| |
| mtu_info = IP6CBMTU(skb); |
| |
| mtu_info->ip6m_mtu = mtu; |
| mtu_info->ip6m_addr.sin6_family = AF_INET6; |
| mtu_info->ip6m_addr.sin6_port = 0; |
| mtu_info->ip6m_addr.sin6_flowinfo = 0; |
| mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
| mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; |
| |
| __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
| skb_reset_transport_header(skb); |
| |
| skb = xchg(&np->rxpmtu, skb); |
| kfree_skb(skb); |
| } |
| |
| /* For some errors we have valid addr_offset even with zero payload and |
| * zero port. Also, addr_offset should be supported if port is set. |
| */ |
| static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) |
| { |
| return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || |
| serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || |
| serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; |
| } |
| |
| /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. |
| * |
| * At one point, excluding local errors was a quick test to identify icmp/icmp6 |
| * errors. This is no longer true, but the test remained, so the v6 stack, |
| * unlike v4, also honors cmsg requests on all wifi and timestamp errors. |
| */ |
| static bool ip6_datagram_support_cmsg(struct sk_buff *skb, |
| struct sock_exterr_skb *serr) |
| { |
| if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || |
| serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) |
| return true; |
| |
| if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) |
| return false; |
| |
| if (!IP6CB(skb)->iif) |
| return false; |
| |
| return true; |
| } |
| |
| /* |
| * Handle MSG_ERRQUEUE |
| */ |
| int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sock_exterr_skb *serr; |
| struct sk_buff *skb; |
| DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
| struct { |
| struct sock_extended_err ee; |
| struct sockaddr_in6 offender; |
| } errhdr; |
| int err; |
| int copied; |
| |
| err = -EAGAIN; |
| skb = sock_dequeue_err_skb(sk); |
| if (!skb) |
| goto out; |
| |
| copied = skb->len; |
| if (copied > len) { |
| msg->msg_flags |= MSG_TRUNC; |
| copied = len; |
| } |
| err = skb_copy_datagram_msg(skb, 0, msg, copied); |
| if (unlikely(err)) { |
| kfree_skb(skb); |
| return err; |
| } |
| sock_recv_timestamp(msg, sk, skb); |
| |
| serr = SKB_EXT_ERR(skb); |
| |
| if (sin && ipv6_datagram_support_addr(serr)) { |
| const unsigned char *nh = skb_network_header(skb); |
| sin->sin6_family = AF_INET6; |
| sin->sin6_flowinfo = 0; |
| sin->sin6_port = serr->port; |
| if (skb->protocol == htons(ETH_P_IPV6)) { |
| const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), |
| struct ipv6hdr, daddr); |
| sin->sin6_addr = ip6h->daddr; |
| if (np->sndflow) |
| sin->sin6_flowinfo = ip6_flowinfo(ip6h); |
| sin->sin6_scope_id = |
| ipv6_iface_scope_id(&sin->sin6_addr, |
| IP6CB(skb)->iif); |
| } else { |
| ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
| &sin->sin6_addr); |
| sin->sin6_scope_id = 0; |
| } |
| *addr_len = sizeof(*sin); |
| } |
| |
| memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); |
| sin = &errhdr.offender; |
| memset(sin, 0, sizeof(*sin)); |
| |
| if (ip6_datagram_support_cmsg(skb, serr)) { |
| sin->sin6_family = AF_INET6; |
| if (np->rxopt.all) |
| ip6_datagram_recv_common_ctl(sk, msg, skb); |
| if (skb->protocol == htons(ETH_P_IPV6)) { |
| sin->sin6_addr = ipv6_hdr(skb)->saddr; |
| if (np->rxopt.all) |
| ip6_datagram_recv_specific_ctl(sk, msg, skb); |
| sin->sin6_scope_id = |
| ipv6_iface_scope_id(&sin->sin6_addr, |
| IP6CB(skb)->iif); |
| } else { |
| ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
| &sin->sin6_addr); |
| if (inet_sk(sk)->cmsg_flags) |
| ip_cmsg_recv(msg, skb); |
| } |
| } |
| |
| put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); |
| |
| /* Now we could try to dump offended packet options */ |
| |
| msg->msg_flags |= MSG_ERRQUEUE; |
| err = copied; |
| |
| consume_skb(skb); |
| out: |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(ipv6_recv_error); |
| |
| /* |
| * Handle IPV6_RECVPATHMTU |
| */ |
| int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, |
| int *addr_len) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sk_buff *skb; |
| struct ip6_mtuinfo mtu_info; |
| DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
| int err; |
| int copied; |
| |
| err = -EAGAIN; |
| skb = xchg(&np->rxpmtu, NULL); |
| if (!skb) |
| goto out; |
| |
| copied = skb->len; |
| if (copied > len) { |
| msg->msg_flags |= MSG_TRUNC; |
| copied = len; |
| } |
| err = skb_copy_datagram_msg(skb, 0, msg, copied); |
| if (err) |
| goto out_free_skb; |
| |
| sock_recv_timestamp(msg, sk, skb); |
| |
| memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); |
| |
| if (sin) { |
| sin->sin6_family = AF_INET6; |
| sin->sin6_flowinfo = 0; |
| sin->sin6_port = 0; |
| sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; |
| sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; |
| *addr_len = sizeof(*sin); |
| } |
| |
| put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); |
| |
| err = copied; |
| |
| out_free_skb: |
| kfree_skb(skb); |
| out: |
| return err; |
| } |
| |
| |
| void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, |
| struct sk_buff *skb) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); |
| |
| if (np->rxopt.bits.rxinfo) { |
| struct in6_pktinfo src_info; |
| |
| if (is_ipv6) { |
| src_info.ipi6_ifindex = IP6CB(skb)->iif; |
| src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
| } else { |
| src_info.ipi6_ifindex = |
| PKTINFO_SKB_CB(skb)->ipi_ifindex; |
| ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, |
| &src_info.ipi6_addr); |
| } |
| |
| if (src_info.ipi6_ifindex >= 0) |
| put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, |
| sizeof(src_info), &src_info); |
| } |
| } |
| |
| void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, |
| struct sk_buff *skb) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct inet6_skb_parm *opt = IP6CB(skb); |
| unsigned char *nh = skb_network_header(skb); |
| |
| if (np->rxopt.bits.rxhlim) { |
| int hlim = ipv6_hdr(skb)->hop_limit; |
| put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
| } |
| |
| if (np->rxopt.bits.rxtclass) { |
| int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
| put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
| } |
| |
| if (np->rxopt.bits.rxflow) { |
| __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); |
| if (flowinfo) |
| put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); |
| } |
| |
| /* HbH is allowed only once */ |
| if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { |
| u8 *ptr = nh + sizeof(struct ipv6hdr); |
| put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
| } |
| |
| if (opt->lastopt && |
| (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { |
| /* |
| * Silly enough, but we need to reparse in order to |
| * report extension headers (except for HbH) |
| * in order. |
| * |
| * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
| * (and WILL NOT be) defined because |
| * IPV6_RECVDSTOPTS is more generic. --yoshfuji |
| */ |
| unsigned int off = sizeof(struct ipv6hdr); |
| u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
| |
| while (off <= opt->lastopt) { |
| unsigned int len; |
| u8 *ptr = nh + off; |
| |
| switch (nexthdr) { |
| case IPPROTO_DSTOPTS: |
| nexthdr = ptr[0]; |
| len = (ptr[1] + 1) << 3; |
| if (np->rxopt.bits.dstopts) |
| put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); |
| break; |
| case IPPROTO_ROUTING: |
| nexthdr = ptr[0]; |
| len = (ptr[1] + 1) << 3; |
| if (np->rxopt.bits.srcrt) |
| put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); |
| break; |
| case IPPROTO_AH: |
| nexthdr = ptr[0]; |
| len = (ptr[1] + 2) << 2; |
| break; |
| default: |
| nexthdr = ptr[0]; |
| len = (ptr[1] + 1) << 3; |
| break; |
| } |
| |
| off += len; |
| } |
| } |
| |
| /* socket options in old style */ |
| if (np->rxopt.bits.rxoinfo) { |
| struct in6_pktinfo src_info; |
| |
| src_info.ipi6_ifindex = opt->iif; |
| src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
| put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
| } |
| if (np->rxopt.bits.rxohlim) { |
| int hlim = ipv6_hdr(skb)->hop_limit; |
| put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
| } |
| if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { |
| u8 *ptr = nh + sizeof(struct ipv6hdr); |
| put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
| } |
| if (np->rxopt.bits.odstopts && opt->dst0) { |
| u8 *ptr = nh + opt->dst0; |
| put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
| } |
| if (np->rxopt.bits.osrcrt && opt->srcrt) { |
| struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
| put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
| } |
| if (np->rxopt.bits.odstopts && opt->dst1) { |
| u8 *ptr = nh + opt->dst1; |
| put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
| } |
| if (np->rxopt.bits.rxorigdstaddr) { |
| struct sockaddr_in6 sin6; |
| __be16 _ports[2], *ports; |
| |
| ports = skb_header_pointer(skb, skb_transport_offset(skb), |
| sizeof(_ports), &_ports); |
| if (ports) { |
| /* All current transport protocols have the port numbers in the |
| * first four bytes of the transport header and this function is |
| * written with this assumption in mind. |
| */ |
| sin6.sin6_family = AF_INET6; |
| sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
| sin6.sin6_port = ports[1]; |
| sin6.sin6_flowinfo = 0; |
| sin6.sin6_scope_id = |
| ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, |
| opt->iif); |
| |
| put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); |
| } |
| } |
| if (np->rxopt.bits.recvfragsize && opt->frag_max_size) { |
| int val = opt->frag_max_size; |
| |
| put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val); |
| } |
| } |
| |
| void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, |
| struct sk_buff *skb) |
| { |
| ip6_datagram_recv_common_ctl(sk, msg, skb); |
| ip6_datagram_recv_specific_ctl(sk, msg, skb); |
| } |
| EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
| |
| int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
| struct msghdr *msg, struct flowi6 *fl6, |
| struct ipcm6_cookie *ipc6) |
| { |
| struct in6_pktinfo *src_info; |
| struct cmsghdr *cmsg; |
| struct ipv6_rt_hdr *rthdr; |
| struct ipv6_opt_hdr *hdr; |
| struct ipv6_txoptions *opt = ipc6->opt; |
| int len; |
| int err = 0; |
| |
| for_each_cmsghdr(cmsg, msg) { |
| int addr_type; |
| |
| if (!CMSG_OK(msg, cmsg)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| if (cmsg->cmsg_level == SOL_SOCKET) { |
| err = __sock_cmsg_send(sk, msg, cmsg, &ipc6->sockc); |
| if (err) |
| return err; |
| continue; |
| } |
| |
| if (cmsg->cmsg_level != SOL_IPV6) |
| continue; |
| |
| switch (cmsg->cmsg_type) { |
| case IPV6_PKTINFO: |
| case IPV6_2292PKTINFO: |
| { |
| struct net_device *dev = NULL; |
| int src_idx; |
| |
| if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); |
| src_idx = src_info->ipi6_ifindex; |
| |
| if (src_idx) { |
| if (fl6->flowi6_oif && |
| src_idx != fl6->flowi6_oif && |
| (sk->sk_bound_dev_if != fl6->flowi6_oif || |
| !sk_dev_equal_l3scope(sk, src_idx))) |
| return -EINVAL; |
| fl6->flowi6_oif = src_idx; |
| } |
| |
| addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
| |
| rcu_read_lock(); |
| if (fl6->flowi6_oif) { |
| dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); |
| if (!dev) { |
| rcu_read_unlock(); |
| return -ENODEV; |
| } |
| } else if (addr_type & IPV6_ADDR_LINKLOCAL) { |
| rcu_read_unlock(); |
| return -EINVAL; |
| } |
| |
| if (addr_type != IPV6_ADDR_ANY) { |
| int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; |
| if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) && |
| !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr, |
| dev, !strict, 0, |
| IFA_F_TENTATIVE) && |
| !ipv6_chk_acast_addr_src(net, dev, |
| &src_info->ipi6_addr)) |
| err = -EINVAL; |
| else |
| fl6->saddr = src_info->ipi6_addr; |
| } |
| |
| rcu_read_unlock(); |
| |
| if (err) |
| goto exit_f; |
| |
| break; |
| } |
| |
| case IPV6_FLOWINFO: |
| if (cmsg->cmsg_len < CMSG_LEN(4)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
| if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| } |
| fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
| break; |
| |
| case IPV6_2292HOPOPTS: |
| case IPV6_HOPOPTS: |
| if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| len = ((hdr->hdrlen + 1) << 3); |
| if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
| err = -EPERM; |
| goto exit_f; |
| } |
| opt->opt_nflen += len; |
| opt->hopopt = hdr; |
| break; |
| |
| case IPV6_2292DSTOPTS: |
| if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| len = ((hdr->hdrlen + 1) << 3); |
| if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
| err = -EPERM; |
| goto exit_f; |
| } |
| if (opt->dst1opt) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| opt->opt_flen += len; |
| opt->dst1opt = hdr; |
| break; |
| |
| case IPV6_DSTOPTS: |
| case IPV6_RTHDRDSTOPTS: |
| if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); |
| len = ((hdr->hdrlen + 1) << 3); |
| if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
| err = -EPERM; |
| goto exit_f; |
| } |
| if (cmsg->cmsg_type == IPV6_DSTOPTS) { |
| opt->opt_flen += len; |
| opt->dst1opt = hdr; |
| } else { |
| opt->opt_nflen += len; |
| opt->dst0opt = hdr; |
| } |
| break; |
| |
| case IPV6_2292RTHDR: |
| case IPV6_RTHDR: |
| if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); |
| |
| switch (rthdr->type) { |
| #if IS_ENABLED(CONFIG_IPV6_MIP6) |
| case IPV6_SRCRT_TYPE_2: |
| if (rthdr->hdrlen != 2 || |
| rthdr->segments_left != 1) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| break; |
| #endif |
| default: |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| len = ((rthdr->hdrlen + 1) << 3); |
| |
| if (cmsg->cmsg_len < CMSG_LEN(len)) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| /* segments left must also match */ |
| if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| opt->opt_nflen += len; |
| opt->srcrt = rthdr; |
| |
| if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
| int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
| |
| opt->opt_nflen += dsthdrlen; |
| opt->dst0opt = opt->dst1opt; |
| opt->dst1opt = NULL; |
| opt->opt_flen -= dsthdrlen; |
| } |
| |
| break; |
| |
| case IPV6_2292HOPLIMIT: |
| case IPV6_HOPLIMIT: |
| if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| ipc6->hlimit = *(int *)CMSG_DATA(cmsg); |
| if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) { |
| err = -EINVAL; |
| goto exit_f; |
| } |
| |
| break; |
| |
| case IPV6_TCLASS: |
| { |
| int tc; |
| |
| err = -EINVAL; |
| if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
| goto exit_f; |
| |
| tc = *(int *)CMSG_DATA(cmsg); |
| if (tc < -1 || tc > 0xff) |
| goto exit_f; |
| |
| err = 0; |
| ipc6->tclass = tc; |
| |
| break; |
| } |
| |
| case IPV6_DONTFRAG: |
| { |
| int df; |
| |
| err = -EINVAL; |
| if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
| goto exit_f; |
| |
| df = *(int *)CMSG_DATA(cmsg); |
| if (df < 0 || df > 1) |
| goto exit_f; |
| |
| err = 0; |
| ipc6->dontfrag = df; |
| |
| break; |
| } |
| default: |
| net_dbg_ratelimited("invalid cmsg type: %d\n", |
| cmsg->cmsg_type); |
| err = -EINVAL; |
| goto exit_f; |
| } |
| } |
| |
| exit_f: |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |
| |
| void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, |
| __u16 srcp, __u16 destp, int rqueue, int bucket) |
| { |
| const struct in6_addr *dest, *src; |
| |
| dest = &sp->sk_v6_daddr; |
| src = &sp->sk_v6_rcv_saddr; |
| seq_printf(seq, |
| "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", |
| bucket, |
| src->s6_addr32[0], src->s6_addr32[1], |
| src->s6_addr32[2], src->s6_addr32[3], srcp, |
| dest->s6_addr32[0], dest->s6_addr32[1], |
| dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| sp->sk_state, |
| sk_wmem_alloc_get(sp), |
| rqueue, |
| 0, 0L, 0, |
| from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
| 0, |
| sock_i_ino(sp), |
| refcount_read(&sp->sk_refcnt), sp, |
| atomic_read(&sp->sk_drops)); |
| } |