sctp: change to check peer prsctp_capable when using prsctp polices

Now before using prsctp polices, sctp uses asoc->prsctp_enable to
check if prsctp is enabled. However asoc->prsctp_enable is set only
means local host support prsctp, sctp should not abandon packet if
peer host doesn't enable prsctp.

So this patch is to use asoc->peer.prsctp_capable to check if prsctp
is enabled on both side, instead of asoc->prsctp_enable, as asoc's
peer.prsctp_capable is set only when local and peer both enable prsctp.

Fixes: a6c2f792 ("sctp: implement prsctp TTL policy")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/chunk.c

@@ -179,7 +179,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
 			 msg, msg->expires_at, jiffies);
 	}
 
-	if (asoc->prsctp_enable &&
+	if (asoc->peer.prsctp_capable &&
 	    SCTP_PR_TTL_ENABLED(sinfo->sinfo_flags))
 		msg->expires_at =
 			jiffies + msecs_to_jiffies(sinfo->sinfo_timetolive);
@@ -340,7 +340,7 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
 /* Check whether this message has expired. */
 int sctp_chunk_abandoned(struct sctp_chunk *chunk)
 {
-	if (!chunk->asoc->prsctp_enable ||
+	if (!chunk->asoc->peer.prsctp_capable ||
 	    !SCTP_PR_POLICY(chunk->sinfo.sinfo_flags)) {
 		struct sctp_datamsg *msg = chunk->msg;
 

net/sctp/outqueue.c

@@ -326,7 +326,7 @@ int sctp_outq_tail(struct sctp_outq *q, struct sctp_chunk *chunk, gfp_t gfp)
 
 			sctp_chunk_hold(chunk);
 			sctp_outq_tail_data(q, chunk);
-			if (chunk->asoc->prsctp_enable &&
+			if (chunk->asoc->peer.prsctp_capable &&
 			    SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
 				chunk->asoc->sent_cnt_removable++;
 			if (chunk->chunk_hdr->flags & SCTP_DATA_UNORDERED)
@@ -442,7 +442,7 @@ void sctp_prsctp_prune(struct sctp_association *asoc,
 {
 	struct sctp_transport *transport;
 
-	if (!asoc->prsctp_enable || !asoc->sent_cnt_removable)
+	if (!asoc->peer.prsctp_capable || !asoc->sent_cnt_removable)
 		return;
 
 	msg_len = sctp_prsctp_prune_sent(asoc, sinfo,
@@ -1055,7 +1055,7 @@ static int sctp_outq_flush(struct sctp_outq *q, int rtx_timeout, gfp_t gfp)
 
 				/* Mark as failed send. */
 				sctp_chunk_fail(chunk, SCTP_ERROR_INV_STRM);
-				if (asoc->prsctp_enable &&
+				if (asoc->peer.prsctp_capable &&
 				    SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
 					asoc->sent_cnt_removable--;
 				sctp_chunk_free(chunk);
@@ -1347,7 +1347,7 @@ int sctp_outq_sack(struct sctp_outq *q, struct sctp_chunk *chunk)
 		tsn = ntohl(tchunk->subh.data_hdr->tsn);
 		if (TSN_lte(tsn, ctsn)) {
 			list_del_init(&tchunk->transmitted_list);
-			if (asoc->prsctp_enable &&
+			if (asoc->peer.prsctp_capable &&
 			    SCTP_PR_PRIO_ENABLED(chunk->sinfo.sinfo_flags))
 				asoc->sent_cnt_removable--;
 			sctp_chunk_free(tchunk);