From 402d68c43326d2f0e7e2e9a9013cd4c098d9b87c Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Sat, 17 Jun 2006 22:54:51 -0700 Subject: [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 Signed-off-by: Sridhar Samudrala Signed-off-by: David S. Miller --- net/sctp/socket.c | 26 +++++++++++++++++++++++++- 1 file changed, 25 insertions(+), 1 deletion(-) diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 174d4d3..b41dcbb 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; -- 2.7.4