X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fsctp%2Ftransport.c;h=f4938f6c5abe09656f33e3ec04d583f00a4eafa7;hb=7524d7d6de5d5d3f081de8cf5479819fad339661;hp=961df275d5b91077dedeb63fad37f8be6f5a89f4;hpb=18062a91d2ddc40e19fc674afeb7cad58cfa23ab;p=linux-2.6

diff --git a/net/sctp/transport.c b/net/sctp/transport.c
index 961df275d5..f4938f6c5a 100644
--- a/net/sctp/transport.c
+++ b/net/sctp/transport.c
@@ -1,23 +1,23 @@
-/* SCTP kernel reference Implementation
+/* SCTP kernel implementation
  * Copyright (c) 1999-2000 Cisco, Inc.
  * Copyright (c) 1999-2001 Motorola, Inc.
  * Copyright (c) 2001-2003 International Business Machines Corp.
  * Copyright (c) 2001 Intel Corp.
  * Copyright (c) 2001 La Monte H.P. Yarroll
  *
- * This file is part of the SCTP kernel reference Implementation
+ * This file is part of the SCTP kernel implementation
  *
  * This module provides the abstraction for an SCTP tranport representing
  * a remote transport address.  For local transport addresses, we just use
  * union sctp_addr.
  *
- * The SCTP reference implementation is free software;
+ * This SCTP implementation is free software;
  * you can redistribute it and/or modify it under the terms of
  * the GNU General Public License as published by
  * the Free Software Foundation; either version 2, or (at your option)
  * any later version.
  *
- * The SCTP reference implementation is distributed in the hope that it
+ * This SCTP implementation is distributed in the hope that it
  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  *                 ************************
  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
@@ -74,8 +74,8 @@ static struct sctp_transport *sctp_transport_init(struct sctp_transport *peer,
 	 * given destination transport address, set RTO to the protocol
 	 * parameter 'RTO.Initial'.
 	 */
+	peer->last_rto = peer->rto = msecs_to_jiffies(sctp_rto_initial);
 	peer->rtt = 0;
-	peer->rto = msecs_to_jiffies(sctp_rto_initial);
 	peer->rttvar = 0;
 	peer->srtt = 0;
 	peer->rto_pending = 0;
@@ -99,15 +99,10 @@ static struct sctp_transport *sctp_transport_init(struct sctp_transport *peer,
 	INIT_LIST_HEAD(&peer->send_ready);
 	INIT_LIST_HEAD(&peer->transports);
 
-	/* Set up the retransmission timer.  */
-	init_timer(&peer->T3_rtx_timer);
-	peer->T3_rtx_timer.function = sctp_generate_t3_rtx_event;
-	peer->T3_rtx_timer.data = (unsigned long)peer;
-
-	/* Set up the heartbeat timer. */
-	init_timer(&peer->hb_timer);
-	peer->hb_timer.function = sctp_generate_heartbeat_event;
-	peer->hb_timer.data = (unsigned long)peer;
+	setup_timer(&peer->T3_rtx_timer, sctp_generate_t3_rtx_event,
+			(unsigned long)peer);
+	setup_timer(&peer->hb_timer, sctp_generate_heartbeat_event,
+			(unsigned long)peer);
 
 	/* Initialize the 64-bit random nonce sent with heartbeat. */
 	get_random_bytes(&peer->hb_nonce, sizeof(peer->hb_nonce));
@@ -241,6 +236,45 @@ void sctp_transport_pmtu(struct sctp_transport *transport)
 		transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
 }
 
+/* this is a complete rip-off from __sk_dst_check
+ * the cookie is always 0 since this is how it's used in the
+ * pmtu code
+ */
+static struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
+{
+	struct dst_entry *dst = t->dst;
+
+	if (dst && dst->obsolete && dst->ops->check(dst, 0) == NULL) {
+		dst_release(t->dst);
+		t->dst = NULL;
+		return NULL;
+	}
+
+	return dst;
+}
+
+void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
+{
+	struct dst_entry *dst;
+
+	if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
+		printk(KERN_WARNING "%s: Reported pmtu %d too low, "
+		       "using default minimum of %d\n",
+		       __func__, pmtu,
+		       SCTP_DEFAULT_MINSEGMENT);
+		/* Use default minimum segment size and disable
+		 * pmtu discovery on this transport.
+		 */
+		t->pathmtu = SCTP_DEFAULT_MINSEGMENT;
+	} else {
+		t->pathmtu = pmtu;
+	}
+
+	dst = sctp_transport_dst_check(t);
+	if (dst)
+		dst->ops->update_pmtu(dst, pmtu);
+}
+
 /* Caches the dst entry and source address for a transport's destination
  * address.
  */
@@ -346,6 +380,7 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
 		tp->rto = tp->asoc->rto_max;
 
 	tp->rtt = rtt;
+	tp->last_rto = tp->rto;
 
 	/* Reset rto_pending so that a new RTT measurement is started when a
 	 * new data chunk is sent.
@@ -353,7 +388,7 @@ void sctp_transport_update_rto(struct sctp_transport *tp, __u32 rtt)
 	tp->rto_pending = 0;
 
 	SCTP_DEBUG_PRINTK("%s: transport: %p, rtt: %d, srtt: %d "
-			  "rttvar: %d, rto: %ld\n", __FUNCTION__,
+			  "rttvar: %d, rto: %ld\n", __func__,
 			  tp, rtt, tp->srtt, tp->rttvar, tp->rto);
 }
 
@@ -399,7 +434,7 @@ void sctp_transport_raise_cwnd(struct sctp_transport *transport,
 		SCTP_DEBUG_PRINTK("%s: SLOW START: transport: %p, "
 				  "bytes_acked: %d, cwnd: %d, ssthresh: %d, "
 				  "flight_size: %d, pba: %d\n",
-				  __FUNCTION__,
+				  __func__,
 				  transport, bytes_acked, cwnd,
 				  ssthresh, flight_size, pba);
 	} else {
@@ -425,7 +460,7 @@ void sctp_transport_raise_cwnd(struct sctp_transport *transport,
 		SCTP_DEBUG_PRINTK("%s: CONGESTION AVOIDANCE: "
 				  "transport: %p, bytes_acked: %d, cwnd: %d, "
 				  "ssthresh: %d, flight_size: %d, pba: %d\n",
-				  __FUNCTION__,
+				  __func__,
 				  transport, bytes_acked, cwnd,
 				  ssthresh, flight_size, pba);
 	}
@@ -511,7 +546,7 @@ void sctp_transport_lower_cwnd(struct sctp_transport *transport,
 
 	transport->partial_bytes_acked = 0;
 	SCTP_DEBUG_PRINTK("%s: transport: %p reason: %d cwnd: "
-			  "%d ssthresh: %d\n", __FUNCTION__,
+			  "%d ssthresh: %d\n", __func__,
 			  transport, reason,
 			  transport->cwnd, transport->ssthresh);
 }
@@ -539,7 +574,7 @@ void sctp_transport_reset(struct sctp_transport *t)
 	 */
 	t->cwnd = min(4*asoc->pathmtu, max_t(__u32, 2*asoc->pathmtu, 4380));
 	t->ssthresh = asoc->peer.i.a_rwnd;
-	t->rto = asoc->rto_initial;
+	t->last_rto = t->rto = asoc->rto_initial;
 	t->rtt = 0;
 	t->srtt = 0;
 	t->rttvar = 0;