[SCTP] Update pmtu handling to be similar to tcp

Introduce new function sctp_transport_update_pmtu that updates
the transports and destination caches view of the path mtu.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Acked-by: Sridhar Samudrala <sri@us.ibm.com>

1 files changed, 2 insertions, 14 deletions

diff --git a/net/sctp/input.c b/net/sctp/input.c
index 885109fb3dda..45d6a644cf06 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -371,20 +371,8 @@ void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
                 return;
 
         if (t->param_flags & SPP_PMTUD_ENABLE) {
-                if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
-                        printk(KERN_WARNING "%s: Reported pmtu %d too low, "
-                               "using default minimum of %d\n",
-                               __FUNCTION__, pmtu,
-                               SCTP_DEFAULT_MINSEGMENT);
-                        /* Use default minimum segment size and disable
-                         * pmtu discovery on this transport.
-                         */
-                        t->pathmtu = SCTP_DEFAULT_MINSEGMENT;
-                        t->param_flags = (t->param_flags & ~SPP_PMTUD) |
-                                SPP_PMTUD_DISABLE;
-                } else {
-                        t->pathmtu = pmtu;
-                }
+                /* Update transports view of the MTU */
+                sctp_transport_update_pmtu(t, pmtu);
 
                 /* Update association pmtu. */
                 sctp_assoc_sync_pmtu(asoc);