diff options
| author |   Gui Jianfeng <guijianfeng@cn.fujitsu.com> | 2008-04-12 18:39:34 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2008-04-12 18:39:34 -0700 |
| commit | f4ad85ca3ef8a1ede76c5020a28a8f4057b4d24f (patch) | |
| tree | cfab9dcd7b29eb150bd6168cf40c375bd9006bbe /net/sctp/sm_statefuns.c | |
| parent | [SCTP]: Add check for hmac_algo parameter in sctp_verify_param() (diff) | |
| download | linux-dev-f4ad85ca3ef8a1ede76c5020a28a8f4057b4d24f.tar.xz linux-dev-f4ad85ca3ef8a1ede76c5020a28a8f4057b4d24f.zip | |
[SCTP]: Fix protocol violation when receiving an error lenght INIT-ACK
When receiving an error length INIT-ACK during COOKIE-WAIT,
a 0-vtag ABORT will be responsed. This action violates the
protocol apparently. This patch achieves the following things.
1 If the INIT-ACK contains all the fixed parameters, use init-tag
recorded from INIT-ACK as vtag.
2 If the INIT-ACK doesn't contain all the fixed parameters,
just reflect its vtag.
Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp/sm_statefuns.c')
| -rw-r--r-- | net/sctp/sm_statefuns.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index f2ed6473feef..3ef97499df0d 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -4144,6 +4144,24 @@ static sctp_disposition_t sctp_sf_abort_violation( goto nomem; if (asoc) { + /* Treat INIT-ACK as a special case during COOKIE-WAIT. */ + if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK && + !asoc->peer.i.init_tag) { + sctp_initack_chunk_t *initack; + + initack = (sctp_initack_chunk_t *)chunk->chunk_hdr; + if (!sctp_chunk_length_valid(chunk, + sizeof(sctp_initack_chunk_t))) + abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T; + else { + unsigned int inittag; + + inittag = ntohl(initack->init_hdr.init_tag); + sctp_add_cmd_sf(commands, SCTP_CMD_UPDATE_INITTAG, + SCTP_U32(inittag)); + } + } + sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(abort)); SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS); |