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-rw-r--r--net/ipv4/af_inet.c113
1 files changed, 113 insertions, 0 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 9e83d7773d8f..7137e6420d66 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -951,6 +951,119 @@ void inet_unregister_protosw(struct inet_protosw *p)
951 } 951 }
952} 952}
953 953
954/*
955 * Shall we try to damage output packets if routing dev changes?
956 */
957
958int sysctl_ip_dynaddr;
959
960static int inet_sk_reselect_saddr(struct sock *sk)
961{
962 struct inet_sock *inet = inet_sk(sk);
963 int err;
964 struct rtable *rt;
965 __u32 old_saddr = inet->saddr;
966 __u32 new_saddr;
967 __u32 daddr = inet->daddr;
968
969 if (inet->opt && inet->opt->srr)
970 daddr = inet->opt->faddr;
971
972 /* Query new route. */
973 err = ip_route_connect(&rt, daddr, 0,
974 RT_CONN_FLAGS(sk),
975 sk->sk_bound_dev_if,
976 sk->sk_protocol,
977 inet->sport, inet->dport, sk);
978 if (err)
979 return err;
980
981 sk_setup_caps(sk, &rt->u.dst);
982
983 new_saddr = rt->rt_src;
984
985 if (new_saddr == old_saddr)
986 return 0;
987
988 if (sysctl_ip_dynaddr > 1) {
989 printk(KERN_INFO "%s(): shifting inet->"
990 "saddr from %d.%d.%d.%d to %d.%d.%d.%d\n",
991 __FUNCTION__,
992 NIPQUAD(old_saddr),
993 NIPQUAD(new_saddr));
994 }
995
996 inet->saddr = inet->rcv_saddr = new_saddr;
997
998 /*
999 * XXX The only one ugly spot where we need to
1000 * XXX really change the sockets identity after
1001 * XXX it has entered the hashes. -DaveM
1002 *
1003 * Besides that, it does not check for connection
1004 * uniqueness. Wait for troubles.
1005 */
1006 __sk_prot_rehash(sk);
1007 return 0;
1008}
1009
1010int inet_sk_rebuild_header(struct sock *sk)
1011{
1012 struct inet_sock *inet = inet_sk(sk);
1013 struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
1014 u32 daddr;
1015 int err;
1016
1017 /* Route is OK, nothing to do. */
1018 if (rt)
1019 return 0;
1020
1021 /* Reroute. */
1022 daddr = inet->daddr;
1023 if (inet->opt && inet->opt->srr)
1024 daddr = inet->opt->faddr;
1025{
1026 struct flowi fl = {
1027 .oif = sk->sk_bound_dev_if,
1028 .nl_u = {
1029 .ip4_u = {
1030 .daddr = daddr,
1031 .saddr = inet->saddr,
1032 .tos = RT_CONN_FLAGS(sk),
1033 },
1034 },
1035 .proto = sk->sk_protocol,
1036 .uli_u = {
1037 .ports = {
1038 .sport = inet->sport,
1039 .dport = inet->dport,
1040 },
1041 },
1042 };
1043
1044 err = ip_route_output_flow(&rt, &fl, sk, 0);
1045}
1046 if (!err)
1047 sk_setup_caps(sk, &rt->u.dst);
1048 else {
1049 /* Routing failed... */
1050 sk->sk_route_caps = 0;
1051 /*
1052 * Other protocols have to map its equivalent state to TCP_SYN_SENT.
1053 * DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
1054 */
1055 if (!sysctl_ip_dynaddr ||
1056 sk->sk_state != TCP_SYN_SENT ||
1057 (sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
1058 (err = inet_sk_reselect_saddr(sk)) != 0)
1059 sk->sk_err_soft = -err;
1060 }
1061
1062 return err;
1063}
1064
1065EXPORT_SYMBOL(inet_sk_rebuild_header);
1066
954#ifdef CONFIG_IP_MULTICAST 1067#ifdef CONFIG_IP_MULTICAST
955static struct net_protocol igmp_protocol = { 1068static struct net_protocol igmp_protocol = {
956 .handler = igmp_rcv, 1069 .handler = igmp_rcv,