Commit 8a0d19c5 authored by lucien's avatar lucien Committed by David S. Miller

sctp: start t5 timer only when peer rwnd is 0 and local state is SHUTDOWN_PENDING

when A sends a data to B, then A close() and enter into SHUTDOWN_PENDING
state, if B neither claim his rwnd is 0 nor send SACK for this data, A
will keep retransmitting this data until t5 timeout, Max.Retrans times
can't work anymore, which is bad.

if B's rwnd is not 0, it should send abort after Max.Retrans times, only
when B's rwnd == 0 and A's retransmitting beyonds Max.Retrans times, A
will start t5 timer, which is also commit f8d96052 ("sctp: Enforce
retransmission limit during shutdown") means, but it lacks the condition
peer rwnd == 0.

so fix it by adding a bit (zero_window_announced) in peer to record if
the last rwnd is 0. If it was, zero_window_announced will be set. and use
this bit to decide if start t5 timer when local.state is SHUTDOWN_PENDING.

Fixes: commit f8d96052 ("sctp: Enforce retransmission limit during shutdown")
Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 8b570dc9
...@@ -1493,7 +1493,8 @@ struct sctp_association { ...@@ -1493,7 +1493,8 @@ struct sctp_association {
* : SACK's are not delayed (see Section 6). * : SACK's are not delayed (see Section 6).
*/ */
__u8 sack_needed:1, /* Do we need to sack the peer? */ __u8 sack_needed:1, /* Do we need to sack the peer? */
sack_generation:1; sack_generation:1,
zero_window_announced:1;
__u32 sack_cnt; __u32 sack_cnt;
__u32 adaptation_ind; /* Adaptation Code point. */ __u32 adaptation_ind; /* Adaptation Code point. */
......
...@@ -1252,6 +1252,7 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_chunk *chunk) ...@@ -1252,6 +1252,7 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_chunk *chunk)
*/ */
sack_a_rwnd = ntohl(sack->a_rwnd); sack_a_rwnd = ntohl(sack->a_rwnd);
asoc->peer.zero_window_announced = !sack_a_rwnd;
outstanding = q->outstanding_bytes; outstanding = q->outstanding_bytes;
if (outstanding < sack_a_rwnd) if (outstanding < sack_a_rwnd)
......
...@@ -5412,7 +5412,8 @@ sctp_disposition_t sctp_sf_do_6_3_3_rtx(struct net *net, ...@@ -5412,7 +5412,8 @@ sctp_disposition_t sctp_sf_do_6_3_3_rtx(struct net *net,
SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS); SCTP_INC_STATS(net, SCTP_MIB_T3_RTX_EXPIREDS);
if (asoc->overall_error_count >= asoc->max_retrans) { if (asoc->overall_error_count >= asoc->max_retrans) {
if (asoc->state == SCTP_STATE_SHUTDOWN_PENDING) { if (asoc->peer.zero_window_announced &&
asoc->state == SCTP_STATE_SHUTDOWN_PENDING) {
/* /*
* We are here likely because the receiver had its rwnd * We are here likely because the receiver had its rwnd
* closed for a while and we have not been able to * closed for a while and we have not been able to
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment