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sctp: handle ootb packet in chunk order as defined

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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>
This commit is contained in:
Shan Wei 2011-04-19 21:30:01 +00:00 committed by David S. Miller
parent deb85a6ecc
commit 85c5ed4e44
2 changed files with 21 additions and 15 deletions
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15
net/sctp/input.c
View File

@ -661,7 +661,6 @@ static int sctp_rcv_ootb(struct sk_buff *skb)
{
sctp_chunkhdr_t *ch;
__u8 *ch_end;
sctp_errhdr_t *err;
ch = (sctp_chunkhdr_t *) skb->data;
@ -697,20 +696,6 @@ static int sctp_rcv_ootb(struct sk_buff *skb)
if (SCTP_CID_INIT == ch->type && (void *)ch != skb->data)
goto discard;
/* 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)
goto discard;
if (SCTP_CID_ERROR == ch->type) {
sctp_walk_errors(err, ch) {
if (SCTP_ERROR_STALE_COOKIE == err->cause)
goto discard;
}
}
ch = (sctp_chunkhdr_t *) ch_end;
} while (ch_end < skb_tail_pointer(skb));

21
net/sctp/sm_statefuns.c
View File

@ -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);
}