diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index e4652fe58958..fecdf31816f2 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -912,6 +912,9 @@ struct sctp_transport {
/* Is this structure kfree()able? */
malloced:1;
+ /* Has this transport moved the ctsn since we last sacked */
+ __u32 sack_generation;
+
struct flowi fl;
/* This is the peer's IP address and port. */
@@ -1584,6 +1587,7 @@ struct sctp_association {
*/
__u8 sack_needed; /* Do we need to sack the peer? */
__u32 sack_cnt;
+ __u32 sack_generation;
/* These are capabilities which our peer advertised. */
__u8 ecn_capable:1, /* Can peer do ECN? */
diff --git a/include/net/sctp/tsnmap.h b/include/net/sctp/tsnmap.h
index e7728bc14ccf..2c5d2b4d5d1e 100644
--- a/include/net/sctp/tsnmap.h
+++ b/include/net/sctp/tsnmap.h
@@ -117,7 +117,8 @@ void sctp_tsnmap_free(struct sctp_tsnmap *map);
int sctp_tsnmap_check(const struct sctp_tsnmap *, __u32 tsn);
/* Mark this TSN as seen. */
-int sctp_tsnmap_mark(struct sctp_tsnmap *, __u32 tsn);
+int sctp_tsnmap_mark(struct sctp_tsnmap *, __u32 tsn,
+ struct sctp_transport *trans);
/* Mark this TSN and all lower as seen. */
void sctp_tsnmap_skip(struct sctp_tsnmap *map, __u32 tsn);
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 5bc9ab161b37..b16517ee1aaf 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -271,6 +271,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
*/
asoc->peer.sack_needed = 1;
asoc->peer.sack_cnt = 0;
+ asoc->peer.sack_generation = 1;
/* Assume that the peer will tell us if he recognizes ASCONF
* as part of INIT exchange.
diff --git a/net/sctp/output.c b/net/sctp/output.c
index f1b7d4bb591e..6ae47acaaec6 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -248,6 +248,11 @@ static sctp_xmit_t sctp_packet_bundle_sack(struct sctp_packet *pkt,
/* If the SACK timer is running, we have a pending SACK */
if (timer_pending(timer)) {
struct sctp_chunk *sack;
+
+ if (pkt->transport->sack_generation !=
+ pkt->transport->asoc->peer.sack_generation)
+ return retval;
+
asoc->a_rwnd = asoc->rwnd;
sack = sctp_make_sack(asoc);
if (sack) {
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index a85eeeb55dd0..b6de71efb140 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -734,8 +734,10 @@ struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
int len;
__u32 ctsn;
__u16 num_gabs, num_dup_tsns;
+ struct sctp_association *aptr = (struct sctp_association *)asoc;
struct sctp_tsnmap *map = (struct sctp_tsnmap *)&asoc->peer.tsn_map;
struct sctp_gap_ack_block gabs[SCTP_MAX_GABS];
+ struct sctp_transport *trans;
memset(gabs, 0, sizeof(gabs));
ctsn = sctp_tsnmap_get_ctsn(map);
@@ -805,6 +807,20 @@ struct sctp_chunk *sctp_make_sack(const struct sctp_association *asoc)
sctp_addto_chunk(retval, sizeof(__u32) * num_dup_tsns,
sctp_tsnmap_get_dups(map));
+ /* Once we have a sack generated, check to see what our sack
+ * generation is, if its 0, reset the transports to 0, and reset
+ * the association generation to 1
+ *
+ * The idea is that zero is never used as a valid generation for the
+ * association so no transport will match after a wrap event like this,
+ * Until the next sack
+ */
+ if (++aptr->peer.sack_generation == 0) {
+ list_for_each_entry(trans, &asoc->peer.transport_addr_list,
+ transports)
+ trans->sack_generation = 0;
+ aptr->peer.sack_generation = 1;
+ }
nodata:
return retval;
}
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index c96d1a81cf42..8716da1a8592 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -1268,7 +1268,7 @@ static int sctp_cmd_interpreter(sctp_event_t event_type,
case SCTP_CMD_REPORT_TSN:
/* Record the arrival of a TSN. */
error = sctp_tsnmap_mark(&asoc->peer.tsn_map,
- cmd->obj.u32);
+ cmd->obj.u32, NULL);
break;
case SCTP_CMD_REPORT_FWDTSN:
diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index b026ba0c6992..1dcceb6e0ce6 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -68,6 +68,8 @@ static struct sctp_transport *sctp_transport_init(struct sctp_transport *peer,
peer->af_specific = sctp_get_af_specific(addr->sa.sa_family);
memset(&peer->saddr, 0, sizeof(union sctp_addr));
+ peer->sack_generation = 0;
+
/* From 6.3.1 RTO Calculation:
*
* C1) Until an RTT measurement has been made for a packet sent to the
diff --git a/net/sctp/tsnmap.c b/net/sctp/tsnmap.c
index f1e40cebc981..b5fb7c409023 100644
--- a/net/sctp/tsnmap.c
+++ b/net/sctp/tsnmap.c
@@ -114,7 +114,8 @@ int sctp_tsnmap_check(const struct sctp_tsnmap *map, __u32 tsn)
/* Mark this TSN as seen. */
-int sctp_tsnmap_mark(struct sctp_tsnmap *map, __u32 tsn)
+int sctp_tsnmap_mark(struct sctp_tsnmap *map, __u32 tsn,
+ struct sctp_transport *trans)
{
u16 gap;
@@ -133,6 +134,9 @@ int sctp_tsnmap_mark(struct sctp_tsnmap *map, __u32 tsn)
*/
map->max_tsn_seen++;
map->cumulative_tsn_ack_point++;
+ if (trans)
+ trans->sack_generation =
+ trans->asoc->peer.sack_generation;
map->base_tsn++;
} else {
/* Either we already have a gap, or about to record a gap, so
diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
index 8a84017834c2..33d894776192 100644
--- a/net/sctp/ulpevent.c
+++ b/net/sctp/ulpevent.c
@@ -715,7 +715,8 @@ struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
* can mark it as received so the tsn_map is updated correctly.
*/
if (sctp_tsnmap_mark(&asoc->peer.tsn_map,
- ntohl(chunk->subh.data_hdr->tsn)))
+ ntohl(chunk->subh.data_hdr->tsn),
+ chunk->transport))
goto fail_mark;
/* First calculate the padding, so we don't inadvertently
diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
index f2d1de7f2ffb..f5a6a4f4faf7 100644
--- a/net/sctp/ulpqueue.c
+++ b/net/sctp/ulpqueue.c
@@ -1051,7 +1051,7 @@ void sctp_ulpq_renege(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
if (chunk && (freed >= needed)) {
__u32 tsn;
tsn = ntohl(chunk->subh.data_hdr->tsn);
- sctp_tsnmap_mark(&asoc->peer.tsn_map, tsn);
+ sctp_tsnmap_mark(&asoc->peer.tsn_map, tsn, chunk->transport);
sctp_ulpq_tail_data(ulpq, chunk, gfp);
sctp_ulpq_partial_delivery(ulpq, chunk, gfp);