summaryrefslogtreecommitdiffstats
path: root/net/sctp/transport.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/sctp/transport.c')
-rw-r--r--net/sctp/transport.c29
1 files changed, 19 insertions, 10 deletions
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 1e5a22430cf5..47f82bd794d9 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -248,28 +248,37 @@ void sctp_transport_pmtu(struct sctp_transport *transport, struct sock *sk)
transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
}
-void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
+bool sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
{
struct dst_entry *dst = sctp_transport_dst_check(t);
+ bool change = true;
if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
- pr_warn("%s: Reported pmtu %d too low, using default minimum of %d\n",
- __func__, pmtu, SCTP_DEFAULT_MINSEGMENT);
- /* Use default minimum segment size and disable
- * pmtu discovery on this transport.
- */
- t->pathmtu = SCTP_DEFAULT_MINSEGMENT;
- } else {
- t->pathmtu = pmtu;
+ pr_warn_ratelimited("%s: Reported pmtu %d too low, using default minimum of %d\n",
+ __func__, pmtu, SCTP_DEFAULT_MINSEGMENT);
+ /* Use default minimum segment instead */
+ pmtu = SCTP_DEFAULT_MINSEGMENT;
}
+ pmtu = SCTP_TRUNC4(pmtu);
if (dst) {
dst->ops->update_pmtu(dst, t->asoc->base.sk, NULL, pmtu);
dst = sctp_transport_dst_check(t);
}
- if (!dst)
+ if (!dst) {
t->af_specific->get_dst(t, &t->saddr, &t->fl, t->asoc->base.sk);
+ dst = t->dst;
+ }
+
+ if (dst) {
+ /* Re-fetch, as under layers may have a higher minimum size */
+ pmtu = SCTP_TRUNC4(dst_mtu(dst));
+ change = t->pathmtu != pmtu;
+ }
+ t->pathmtu = pmtu;
+
+ return change;
}
/* Caches the dst entry and source address for a transport's destination