diff options
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); } |