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authorVlad Yasevich <vladislav.yasevich@hp.com>2007-06-07 13:47:03 -0400
committerVladislav Yasevich <vxy@hera.kernel.org>2007-06-13 20:44:42 +0000
commitc910b47e1811b3f8b184108c48de3d7af3e2999b (patch)
tree76ca90239b074a13137217d3732f79fe83a2500b /net/sctp/transport.c
parentfe979ac169970b3d12facd6565766735862395c5 (diff)
downloadkernel-c910b47e1811b3f8b184108c48de3d7af3e2999b.tar.gz
[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>
Diffstat (limited to 'net/sctp/transport.c')
-rw-r--r--net/sctp/transport.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 961df275d5b9..e14c271cf28b 100644
--- 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.
*/