[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>

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 5e81984b847861461abb688214c453802c2ee783..dc0e70cb0f8b587a1a79ce59a305ba75f368c12b 100644 (file)
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1006,6 +1006,7 @@ void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
 void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
 unsigned long sctp_transport_timeout(struct sctp_transport *);
 void sctp_transport_reset(struct sctp_transport *);
+void sctp_transport_update_pmtu(struct sctp_transport *, u32);
 
 
 /* This is the structure we use to queue packets as they come into

diff --git a/net/sctp/input.c b/net/sctp/input.c
index 885109fb3dda129a551ccac0ca4e88d29236c712..45d6a644cf06a75b3ff560f8acbbf33fd7a6edf1 100644 (file)
--- 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);

diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 961df275d5b91077dedeb63fad37f8be6f5a89f4..e14c271cf28ba3059752cb6e8dae84bfa24e285e 100644 (file)
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -241,6 +241,47 @@ void sctp_transport_pmtu(struct sctp_transport *transport)
                transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
 }
 
+/* this is a complete rip-off from __sk_dst_check
+ * the cookie is always 0 since this is how it's used in the
+ * pmtu code
+ */
+static struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
+{
+       struct dst_entry *dst = t->dst;
+
+       if (dst && dst->obsolete && dst->ops->check(dst, 0) == NULL) {
+               dst_release(t->dst);
+               t->dst = NULL;
+               return NULL;
+       }
+
+       return dst;
+}
+
+void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
+{
+       struct dst_entry *dst;
+
+       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;
+       }
+
+       dst = sctp_transport_dst_check(t);
+       if (dst)
+               dst->ops->update_pmtu(dst, pmtu);
+}
+
 /* Caches the dst entry and source address for a transport's destination
  * address.
  */