X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fsctp%2Foutput.c;h=cdc5a393676657691a2421b573235fde8318b0f8;hb=cee4cca740d209bcb4b9857baa2253d5ba4e3fbe;hp=9313716334648fa90c7c39c6faaba289cebbe5d7;hpb=31151ba2cef171344beac254e65bd7e00138bb0d;p=linux-2.6

diff --git a/net/sctp/output.c b/net/sctp/output.c
index 9313716334..cdc5a39367 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -234,8 +234,8 @@ sctp_xmit_t sctp_packet_append_chunk(struct sctp_packet *packet,
 		goto finish;
 
 	pmtu  = ((packet->transport->asoc) ?
-		 (packet->transport->asoc->pmtu) :
-		 (packet->transport->pmtu));
+		 (packet->transport->asoc->pathmtu) :
+		 (packet->transport->pathmtu));
 
 	too_big = (psize + chunk_len > pmtu);
 
@@ -295,14 +295,14 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 	struct sctp_transport *tp = packet->transport;
 	struct sctp_association *asoc = tp->asoc;
 	struct sctphdr *sh;
-	__u32 crc32;
+	__u32 crc32 = 0;
 	struct sk_buff *nskb;
 	struct sctp_chunk *chunk, *tmp;
 	struct sock *sk;
 	int err = 0;
 	int padding;		/* How much padding do we need?  */
 	__u8 has_data = 0;
-	struct dst_entry *dst;
+	struct dst_entry *dst = tp->dst;
 
 	SCTP_DEBUG_PRINTK("%s: packet:%p\n", __FUNCTION__, packet);
 
@@ -327,6 +327,19 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 	 */
 	skb_set_owner_w(nskb, sk);
 
+	/* The 'obsolete' field of dst is set to 2 when a dst is freed. */
+	if (!dst || (dst->obsolete > 1)) {
+		dst_release(dst);
+		sctp_transport_route(tp, NULL, sctp_sk(sk));
+		if (asoc && (asoc->param_flags & SPP_PMTUD_ENABLE)) {
+			sctp_assoc_sync_pmtu(asoc);
+		}
+	}
+	nskb->dst = dst_clone(tp->dst);
+	if (!nskb->dst)
+		goto no_route;
+	dst = nskb->dst;
+
 	/* Build the SCTP header.  */
 	sh = (struct sctphdr *)skb_push(nskb, sizeof(struct sctphdr));
 	sh->source = htons(packet->source_port);
@@ -350,7 +363,8 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 	 * Note: Adler-32 is no longer applicable, as has been replaced
 	 * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
 	 */
-	crc32 = sctp_start_cksum((__u8 *)sh, sizeof(struct sctphdr));
+	if (!(dst->dev->features & NETIF_F_NO_CSUM))
+		crc32 = sctp_start_cksum((__u8 *)sh, sizeof(struct sctphdr));
 
 	/**
 	 * 6.10 Bundling
@@ -402,9 +416,14 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 		if (padding)
 			memset(skb_put(chunk->skb, padding), 0, padding);
 
-		crc32 = sctp_update_copy_cksum(skb_put(nskb, chunk->skb->len),
-					       chunk->skb->data,
-					       chunk->skb->len, crc32);
+		if (dst->dev->features & NETIF_F_NO_CSUM)
+			memcpy(skb_put(nskb, chunk->skb->len),
+			       chunk->skb->data, chunk->skb->len);
+		else
+			crc32 = sctp_update_copy_cksum(skb_put(nskb,
+							chunk->skb->len),
+						chunk->skb->data,
+						chunk->skb->len, crc32);
 
 		SCTP_DEBUG_PRINTK("%s %p[%s] %s 0x%x, %s %d, %s %d, %s %d\n",
 				  "*** Chunk", chunk,
@@ -427,7 +446,8 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 	}
 
 	/* Perform final transformation on checksum. */
-	crc32 = sctp_end_cksum(crc32);
+	if (!(dst->dev->features & NETIF_F_NO_CSUM))
+		crc32 = sctp_end_cksum(crc32);
 
 	/* 3) Put the resultant value into the checksum field in the
 	 *    common header, and leave the rest of the bits unchanged.
@@ -477,22 +497,13 @@ int sctp_packet_transmit(struct sctp_packet *packet)
 		}
 	}
 
-	dst = tp->dst;
-	/* The 'obsolete' field of dst is set to 2 when a dst is freed. */
-	if (!dst || (dst->obsolete > 1)) {
-		dst_release(dst);
-		sctp_transport_route(tp, NULL, sctp_sk(sk));
-		sctp_assoc_sync_pmtu(asoc);
-	}
-
-	nskb->dst = dst_clone(tp->dst);
-	if (!nskb->dst)
-		goto no_route;
-
 	SCTP_DEBUG_PRINTK("***sctp_transmit_packet*** skb len %d\n",
 			  nskb->len);
 
-	(*tp->af_specific->sctp_xmit)(nskb, tp, packet->ipfragok);
+	if (tp->param_flags & SPP_PMTUD_ENABLE)
+		(*tp->af_specific->sctp_xmit)(nskb, tp, packet->ipfragok);
+	else
+		(*tp->af_specific->sctp_xmit)(nskb, tp, 1);
 
 out:
 	packet->size = packet->overhead;
@@ -577,7 +588,7 @@ static sctp_xmit_t sctp_packet_append_data(struct sctp_packet *packet,
 	 * 	if ((flightsize + Max.Burst * MTU) < cwnd)
 	 *		cwnd = flightsize + Max.Burst * MTU
 	 */
-	max_burst_bytes = asoc->max_burst * asoc->pmtu;
+	max_burst_bytes = asoc->max_burst * asoc->pathmtu;
 	if ((transport->flight_size + max_burst_bytes) < transport->cwnd) {
 		transport->cwnd = transport->flight_size + max_burst_bytes;
 		SCTP_DEBUG_PRINTK("%s: cwnd limited by max_burst: "
@@ -603,7 +614,7 @@ static sctp_xmit_t sctp_packet_append_data(struct sctp_packet *packet,
 	 *    When a Fast Retransmit is being performed the sender SHOULD
 	 *    ignore the value of cwnd and SHOULD NOT delay retransmission.
 	 */
-	if (!chunk->fast_retransmit)
+	if (chunk->fast_retransmit <= 0)
 		if (transport->flight_size >= transport->cwnd) {
 			retval = SCTP_XMIT_RWND_FULL;
 			goto finish;
@@ -622,7 +633,7 @@ static sctp_xmit_t sctp_packet_append_data(struct sctp_packet *packet,
 		 * data will fit or delay in hopes of bundling a full
 		 * sized packet.
 		 */
-		if (len < asoc->pmtu - packet->overhead) {
+		if (len < asoc->pathmtu - packet->overhead) {
 			retval = SCTP_XMIT_NAGLE_DELAY;
 			goto finish;
 		}