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Diffstat (limited to 'net/sctp/sm_statefuns.c')
-rw-r--r--net/sctp/sm_statefuns.c21
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);
}