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Now when sending a packet, sctp_transport_dst_check will check if dst is obsolete by calling ipv4/ip6_dst_check.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>
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@ -596,7 +596,9 @@ static inline void sctp_v4_map_v6(union sctp_addr *addr)
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*/
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static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
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{
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if (t->dst && !dst_check(t->dst, t->dst_cookie))
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if (t->dst && (!dst_check(t->dst, t->dst_cookie) ||
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t->pathmtu != max_t(size_t, SCTP_TRUNC4(dst_mtu(t->dst)),
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SCTP_DEFAULT_MINSEGMENT)))
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sctp_transport_dst_release(t);
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return t->dst;
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