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| author | Shan Wei <shanwei@cn.fujitsu.com> | 2011-04-19 21:30:01 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-04-20 01:51:04 -0700 |
| commit | 85c5ed4e44a262344ce43b4bf23204107923ca95 (patch) | |
| tree | 1b494d271d2e08a4f316bbf8cbeb677eed11b939 /net/sctp/sm_statefuns.c | |
| parent | deb85a6ecc432a4f342004a6ac2a0dad7cba6846 (diff) | |
| download | linux-85c5ed4e44a262344ce43b4bf23204107923ca95.tar.bz2 | |
sctp: handle ootb packet in chunk order as defined
Changed the order of processing SHUTDOWN ACK and COOKIE ACK
refer to section 8.4:Handle "Out of the Blue" Packets.
SHUTDOWN ACK chunk should be processed before processing
"Stale Cookie" ERROR or a COOKIE ACK.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Shan Wei <shanwei@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 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 194d5ecab5c3..ad3b43bb75cc 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -3332,8 +3332,10 @@ sctp_disposition_t sctp_sf_ootb(const struct sctp_endpoint *ep, struct sctp_chunk *chunk = arg; struct sk_buff *skb = chunk->skb; sctp_chunkhdr_t *ch; + sctp_errhdr_t *err; __u8 *ch_end; int ootb_shut_ack = 0; + int ootb_cookie_ack = 0; SCTP_INC_STATS(SCTP_MIB_OUTOFBLUES); @@ -3358,6 +3360,23 @@ sctp_disposition_t sctp_sf_ootb(const struct sctp_endpoint *ep, if (SCTP_CID_ABORT == ch->type) return sctp_sf_pdiscard(ep, asoc, type, arg, commands); + /* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR + * or a COOKIE ACK the SCTP Packet should be silently + * discarded. + */ + + if (SCTP_CID_COOKIE_ACK == ch->type) + ootb_cookie_ack = 1; + + if (SCTP_CID_ERROR == ch->type) { + sctp_walk_errors(err, ch) { + if (SCTP_ERROR_STALE_COOKIE == err->cause) { + ootb_cookie_ack = 1; + break; + } + } + } + /* Report violation if chunk len overflows */ ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length)); if (ch_end > skb_tail_pointer(skb)) @@ -3369,6 +3388,8 @@ sctp_disposition_t sctp_sf_ootb(const struct sctp_endpoint *ep, if (ootb_shut_ack) return sctp_sf_shut_8_4_5(ep, asoc, type, arg, commands); + else if (ootb_cookie_ack) + return sctp_sf_pdiscard(ep, asoc, type, arg, commands); else return sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands); } |