From: Vlad Yasevich Date: Wed, 18 Apr 2007 21:11:06 +0000 (-0700) Subject: [SCTP]: Do not interleave non-fragments when in partial delivery X-Git-Tag: v2.6.21~60 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0cf0d9940ef27b46fcbbd9e0cc8427c30fe05eb;p=linux-2.6 [SCTP]: Do not interleave non-fragments when in partial delivery The way partial delivery is currently implemnted, it is possible to intereleave a message (either from another steram, or unordered) that is not part of partial delivery process. The only way to this is for a message to not be a fragment and be 'in order' or unorderd for a given stream. This will result in bypassing the reassembly/ordering queues where things live duing partial delivery, and the message will be delivered to the socket in the middle of partial delivery. This is a two-fold problem, in that: 1. the app now must check the stream-id and flags which it may not be doing. 2. this clearing partial delivery state from the association and results in ulp hanging. This patch is a band-aid over a much bigger problem in that we don't do stream interleave. Signed-off-by: Vlad Yasevich Signed-off-by: David S. Miller --- diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c index bfb197e37d..b29e3e4b72 100644 --- a/net/sctp/ulpqueue.c +++ b/net/sctp/ulpqueue.c @@ -190,7 +190,14 @@ int sctp_ulpq_tail_event(struct sctp_ulpq *ulpq, struct sctp_ulpevent *event) if (!sctp_sk(sk)->pd_mode) { queue = &sk->sk_receive_queue; } else if (ulpq->pd_mode) { - if (event->msg_flags & MSG_NOTIFICATION) + /* If the association is in partial delivery, we + * need to finish delivering the partially processed + * packet before passing any other data. This is + * because we don't truly support stream interleaving. + */ + if ((event->msg_flags & MSG_NOTIFICATION) || + (SCTP_DATA_NOT_FRAG == + (event->msg_flags & SCTP_DATA_FRAG_MASK))) queue = &sctp_sk(sk)->pd_lobby; else { clear_pd = event->msg_flags & MSG_EOR;