1 files changed, 19 insertions, 24 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index bf747094d26bf..d20f7addee19e 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -644,16 +644,15 @@ static int sctp_send_asconf_add_ip(struct sock		*sk,
 
 			list_for_each_entry(trans,
 			    &asoc->peer.transport_addr_list, transports) {
-				/* Clear the source and route cache */
-				sctp_transport_dst_release(trans);
 				trans->cwnd = min(4*asoc->pathmtu, max_t(__u32,
 				    2*asoc->pathmtu, 4380));
 				trans->ssthresh = asoc->peer.i.a_rwnd;
 				trans->rto = asoc->rto_initial;
 				sctp_max_rto(asoc, trans);
 				trans->rtt = trans->srtt = trans->rttvar = 0;
+				/* Clear the source and route cache */
 				sctp_transport_route(trans, NULL,
-				    sctp_sk(asoc->base.sk));
+						     sctp_sk(asoc->base.sk));
 			}
 		}
 		retval = sctp_send_asconf(asoc, chunk);
@@ -896,7 +895,6 @@ skip_mkasconf:
 		 */
 		list_for_each_entry(transport, &asoc->peer.transport_addr_list,
 					transports) {
-			sctp_transport_dst_release(transport);
 			sctp_transport_route(transport, NULL,
 					     sctp_sk(asoc->base.sk));
 		}
@@ -1894,6 +1892,7 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
 				struct sctp_sndrcvinfo *sinfo)
 {
 	struct sock *sk = asoc->base.sk;
+	struct sctp_sock *sp = sctp_sk(sk);
 	struct net *net = sock_net(sk);
 	struct sctp_datamsg *datamsg;
 	bool wait_connect = false;
@@ -1912,13 +1911,16 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
 			goto err;
 	}
 
-	if (sctp_sk(sk)->disable_fragments && msg_len > asoc->frag_point) {
+	if (sp->disable_fragments && msg_len > asoc->frag_point) {
 		err = -EMSGSIZE;
 		goto err;
 	}
 
-	if (asoc->pmtu_pending)
-		sctp_assoc_pending_pmtu(asoc);
+	if (asoc->pmtu_pending) {
+		if (sp->param_flags & SPP_PMTUD_ENABLE)
+			sctp_assoc_sync_pmtu(asoc);
+		asoc->pmtu_pending = 0;
+	}
 
 	if (sctp_wspace(asoc) < msg_len)
 		sctp_prsctp_prune(asoc, sinfo, msg_len - sctp_wspace(asoc));
@@ -1935,7 +1937,7 @@ static int sctp_sendmsg_to_asoc(struct sctp_association *asoc,
 		if (err)
 			goto err;
 
-		if (sctp_sk(sk)->strm_interleave) {
+		if (sp->strm_interleave) {
 			timeo = sock_sndtimeo(sk, 0);
 			err = sctp_wait_for_connect(asoc, &timeo);
 			if (err)
@@ -2538,7 +2540,7 @@ static int sctp_apply_peer_addr_params(struct sctp_paddrparams *params,
 			trans->pathmtu = params->spp_pathmtu;
 			sctp_assoc_sync_pmtu(asoc);
 		} else if (asoc) {
-			asoc->pathmtu = params->spp_pathmtu;
+			sctp_assoc_set_pmtu(asoc, params->spp_pathmtu);
 		} else {
 			sp->pathmtu = params->spp_pathmtu;
 		}
@@ -3208,7 +3210,6 @@ static int sctp_setsockopt_mappedv4(struct sock *sk, char __user *optval, unsign
 static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned int optlen)
 {
 	struct sctp_sock *sp = sctp_sk(sk);
-	struct sctp_af *af = sp->pf->af;
 	struct sctp_assoc_value params;
 	struct sctp_association *asoc;
 	int val;
@@ -3230,30 +3231,24 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned
 		return -EINVAL;
 	}
 
+	asoc = sctp_id2assoc(sk, params.assoc_id);
+
 	if (val) {
 		int min_len, max_len;
+		__u16 datasize = asoc ? sctp_datachk_len(&asoc->stream) :
+				 sizeof(struct sctp_data_chunk);
 
-		min_len = SCTP_DEFAULT_MINSEGMENT - af->net_header_len;
-		min_len -= af->ip_options_len(sk);
-		min_len -= sizeof(struct sctphdr) +
-			   sizeof(struct sctp_data_chunk);
-
-		max_len = SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_data_chunk);
+		min_len = sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT,
+					   datasize);
+		max_len = SCTP_MAX_CHUNK_LEN - datasize;
 
 		if (val < min_len || val > max_len)
 			return -EINVAL;
 	}
 
-	asoc = sctp_id2assoc(sk, params.assoc_id);
 	if (asoc) {
-		if (val == 0) {
-			val = asoc->pathmtu - af->net_header_len;
-			val -= af->ip_options_len(sk);
-			val -= sizeof(struct sctphdr) +
-			       sctp_datachk_len(&asoc->stream);
-		}
 		asoc->user_frag = val;
-		asoc->frag_point = sctp_frag_point(asoc, asoc->pathmtu);
+		sctp_assoc_update_frag_point(asoc);
 	} else {
 		if (params.assoc_id && sctp_style(sk, UDP))
 			return -EINVAL;