Commit d27fc782 authored by fan.du's avatar fan.du Committed by David S. Miller
Browse files

sctp: Don't lookup dst if transport dst is still valid

When sctp sits on IPv6, sctp_transport_dst_check pass cookie as ZERO,
as a result ip6_dst_check always fail out. This behaviour makes
transport->dst useless, because every sctp_packet_transmit must look
for valid dst.

Add a dst_cookie into sctp_transport, and set the cookie whenever we
get new dst for sctp_transport. So dst validness could be checked
against it.

Since I have split genid for IPv4 and IPv6, also delete/add IPv6 address
will also bump IPv6 genid. So issues we discussed in:

have all been sloved for this patch.
Signed-off-by: default avatarFan Du <>
Acked-by: default avatarVlad Yasevich <>
Acked-by: default avatarNeil Horman <>
Signed-off-by: default avatarDavid S. Miller <>
parent ba5082c7
......@@ -613,7 +613,7 @@ static inline void sctp_v4_map_v6(union sctp_addr *addr)
static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
if (t->dst && !dst_check(t->dst, 0)) {
if (t->dst && !dst_check(t->dst, t->dst_cookie)) {
t->dst = NULL;
......@@ -946,6 +946,7 @@ struct sctp_transport {
__u64 hb_nonce;
struct rcu_head rcu;
u32 dst_cookie;
struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,
......@@ -351,7 +351,7 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
rt = (struct rt6_info *)dst;
t->dst = dst;
t->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
pr_debug("rt6_dst:%pI6 rt6_src:%pI6\n", &rt->rt6i_dst.addr,
} else {
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