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authorVlad Yasevich <vladislav.yasevich@hp.com>2006-06-20 00:04:18 -0700
committerChris Wright <chrisw@sous-sol.org>2006-06-29 17:17:15 -0700
commit617495463a301a956990b87913849dd740e58bcf (patch)
tree58cdff088fcda5de60a0fb436afce18e166ebe6f
parentf67656ad55536533ebc33e3154184aeb53b379b8 (diff)
downloadlwn-617495463a301a956990b87913849dd740e58bcf.tar.gz
lwn-617495463a301a956990b87913849dd740e58bcf.zip
[PATCH] SCTP: Limit association max_retrans setting in setsockopt.
When using ASSOCINFO socket option, we need to limit the number of maximum association retransmissions to be no greater than the sum of all the path retransmissions. This is specified in Section 7.1.2 of the SCTP socket API draft. However, we only do this if the association has multiple paths. If there is only one path, the protocol stack will use the assoc_max_retrans setting when trying to retransmit packets. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: Sridhar Samudrala <sri@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Chris Wright <chrisw@sous-sol.org>
-rw-r--r--net/sctp/socket.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 174d4d35e951..b41dcbb89685 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -2530,8 +2530,32 @@ static int sctp_setsockopt_associnfo(struct sock *sk, char __user *optval, int o
/* Set the values to the specific association */
if (asoc) {
- if (assocparams.sasoc_asocmaxrxt != 0)
+ if (assocparams.sasoc_asocmaxrxt != 0) {
+ __u32 path_sum = 0;
+ int paths = 0;
+ struct list_head *pos;
+ struct sctp_transport *peer_addr;
+
+ list_for_each(pos, &asoc->peer.transport_addr_list) {
+ peer_addr = list_entry(pos,
+ struct sctp_transport,
+ transports);
+ path_sum += peer_addr->pathmaxrxt;
+ paths++;
+ }
+
+ /* Only validate asocmaxrxt if we have more then
+ * one path/transport. We do this because path
+ * retransmissions are only counted when we have more
+ * then one path.
+ */
+ if (paths > 1 &&
+ assocparams.sasoc_asocmaxrxt > path_sum)
+ return -EINVAL;
+
asoc->max_retrans = assocparams.sasoc_asocmaxrxt;
+ }
+
if (assocparams.sasoc_cookie_life != 0) {
asoc->cookie_life.tv_sec =
assocparams.sasoc_cookie_life / 1000;