From 02c4e12c6400b6dccdc6b5c2c18325551e4b2dc9 Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Fri, 31 Aug 2007 10:03:58 +0800 Subject: [PATCH] SCTP: Send ABORT chunk with correct tag in response to INIT ACK When SCTP client received an INIT ACK chunk with missing mandatory parameter such as "cookie parameter", it will send back a ABORT with T-bit not set and verification tag is set to 0. This is because before we accept this INIT ACK chunk, we do not know the peer's tag. This patch change to reflect vtag when responding to INIT ACK with missing mandatory parameter. Signed-off-by: Wei Yongjun Signed-off-by: Vlad Yasevich --- net/sctp/sm_statefuns.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 177528ed3e1b..385f1757158a 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -5176,7 +5176,22 @@ static struct sctp_packet *sctp_ootb_pkt_new(const struct sctp_association *asoc * association exists, otherwise, use the peer's vtag. */ if (asoc) { - vtag = asoc->peer.i.init_tag; + /* Special case the INIT-ACK as there is no peer's vtag + * yet. + */ + switch(chunk->chunk_hdr->type) { + case SCTP_CID_INIT_ACK: + { + sctp_initack_chunk_t *initack; + + initack = (sctp_initack_chunk_t *)chunk->chunk_hdr; + vtag = ntohl(initack->init_hdr.init_tag); + break; + } + default: + vtag = asoc->peer.i.init_tag; + break; + } } else { /* Special case the INIT and stale COOKIE_ECHO as there is no * vtag yet.