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sctp: sctp_transport_dst_check should check if transport pmtu is dst mtu 

Now when sending a packet, sctp_transport_dst_check will check if dst
is obsolete by calling ipv4/ip6_dst_check. But they return obsolete
only when adding a new cache, after that when the cache's pmtu is
updated again, it will not trigger transport->dst/pmtu's update.

It can be reproduced by reducing route's pmtu twice. At the 1st time
client will add a new cache, and transport->pathmtu gets updated as
sctp_transport_dst_check finds it's obsolete. But at the 2nd time,
cache's mtu is updated, sctp client will never send out any packet,
because transport->pmtu has no chance to update.

This patch is to fix this by also checking if transport pmtu is dst
mtu in sctp_transport_dst_check, so that transport->pmtu can be
updated on time.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-02-17 16:41:45 +08:00 committed by David S. Miller
parent 585396bc80
commit a4d69a4c3c
1 changed files with 3 additions and 1 deletions
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4
include/net/sctp/sctp.h
View File

@ -596,7 +596,9 @@ 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, t->dst_cookie))
if (t->dst && (!dst_check(t->dst, t->dst_cookie) ||
t->pathmtu != max_t(size_t, SCTP_TRUNC4(dst_mtu(t->dst)),
SCTP_DEFAULT_MINSEGMENT)))
sctp_transport_dst_release(t);
return t->dst;