X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=net%2Fipv4%2Ftcp_ipv4.c;h=67c670886c1fda8f3f8beb156e4b23b36888eae1;hb=bcdd3a911499abd65bf1f123b2a6ad9c1d5611ea;hp=1745dc8d25e66fca6f305b482aaf0cf550f234fd;hpb=0e87506fcc734647c7b2497eee4eb81e785c857a;p=linux-2.6

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1745dc8d25..67c670886c 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -242,9 +242,14 @@ static int tcp_v4_get_port(struct sock *sk, unsigned short snum)
 		tcp_port_rover = rover;
 		spin_unlock(&tcp_portalloc_lock);
 
-		/* Exhausted local port range during search? */
+		/* Exhausted local port range during search?  It is not
+		 * possible for us to be holding one of the bind hash
+		 * locks if this test triggers, because if 'remaining'
+		 * drops to zero, we broke out of the do/while loop at
+		 * the top level, not from the 'break;' statement.
+		 */
 		ret = 1;
-		if (remaining <= 0)
+		if (unlikely(remaining <= 0))
 			goto fail;
 
 		/* OK, here is the one we will use.  HEAD is
@@ -874,7 +879,7 @@ static struct request_sock *tcp_v4_search_req(struct tcp_sock *tp,
 					      __u16 rport,
 					      __u32 raddr, __u32 laddr)
 {
-	struct tcp_listen_opt *lopt = tp->accept_queue.listen_opt;
+	struct listen_sock *lopt = tp->accept_queue.listen_opt;
 	struct request_sock *req, **prev;
 
 	for (prev = &lopt->syn_table[tcp_v4_synq_hash(raddr, rport, lopt->hash_rnd)];
@@ -898,7 +903,7 @@ static struct request_sock *tcp_v4_search_req(struct tcp_sock *tp,
 static void tcp_v4_synq_add(struct sock *sk, struct request_sock *req)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
-	struct tcp_listen_opt *lopt = tp->accept_queue.listen_opt;
+	struct listen_sock *lopt = tp->accept_queue.listen_opt;
 	u32 h = tcp_v4_synq_hash(inet_rsk(req)->rmt_addr, inet_rsk(req)->rmt_port, lopt->hash_rnd);
 
 	reqsk_queue_hash_req(&tp->accept_queue, h, req, TCP_TIMEOUT_INIT);
@@ -1366,21 +1371,6 @@ static inline struct ip_options *tcp_v4_save_options(struct sock *sk,
 	return dopt;
 }
 
-/*
- * Maximum number of SYN_RECV sockets in queue per LISTEN socket.
- * One SYN_RECV socket costs about 80bytes on a 32bit machine.
- * It would be better to replace it with a global counter for all sockets
- * but then some measure against one socket starving all other sockets
- * would be needed.
- *
- * It was 128 by default. Experiments with real servers show, that
- * it is absolutely not enough even at 100conn/sec. 256 cures most
- * of problems. This value is adjusted to 128 for very small machines
- * (<=32Mb of memory) and to 1024 on normal or better ones (>=256Mb).
- * Further increasing requires to change hash table size.
- */
-int sysctl_max_syn_backlog = 256;
-
 struct request_sock_ops tcp_request_sock_ops = {
 	.family		=	PF_INET,
 	.obj_size	=	sizeof(struct tcp_request_sock),
@@ -1509,12 +1499,11 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
 			 * to destinations, already remembered
 			 * to the moment of synflood.
 			 */
-			NETDEBUG(if (net_ratelimit()) \
-					printk(KERN_DEBUG "TCP: drop open "
-							  "request from %u.%u."
-							  "%u.%u/%u\n", \
-					       NIPQUAD(saddr),
-					       ntohs(skb->h.th->source)));
+			LIMIT_NETDEBUG(printk(KERN_DEBUG "TCP: drop open "
+					      "request from %u.%u."
+					      "%u.%u/%u\n",
+					      NIPQUAD(saddr),
+					      ntohs(skb->h.th->source)));
 			dst_release(dst);
 			goto drop_and_free;
 		}
@@ -1642,8 +1631,7 @@ static int tcp_v4_checksum_init(struct sk_buff *skb)
 				  skb->nh.iph->daddr, skb->csum))
 			return 0;
 
-		NETDEBUG(if (net_ratelimit())
-				printk(KERN_DEBUG "hw tcp v4 csum failed\n"));
+		LIMIT_NETDEBUG(printk(KERN_DEBUG "hw tcp v4 csum failed\n"));
 		skb->ip_summed = CHECKSUM_NONE;
 	}
 	if (skb->len <= 76) {
@@ -2060,9 +2048,10 @@ static int tcp_v4_init_sock(struct sock *sk)
 	 */
 	tp->snd_ssthresh = 0x7fffffff;	/* Infinity */
 	tp->snd_cwnd_clamp = ~0;
-	tp->mss_cache_std = tp->mss_cache = 536;
+	tp->mss_cache = 536;
 
 	tp->reordering = sysctl_tcp_reordering;
+	tp->ca_ops = &tcp_init_congestion_ops;
 
 	sk->sk_state = TCP_CLOSE;
 
@@ -2085,6 +2074,8 @@ int tcp_v4_destroy_sock(struct sock *sk)
 
 	tcp_clear_xmit_timers(sk);
 
+	tcp_cleanup_congestion_control(tp);
+
 	/* Cleanup up the write buffer. */
   	sk_stream_writequeue_purge(sk);
 
@@ -2662,7 +2653,6 @@ EXPORT_SYMBOL(tcp_proc_register);
 EXPORT_SYMBOL(tcp_proc_unregister);
 #endif
 EXPORT_SYMBOL(sysctl_local_port_range);
-EXPORT_SYMBOL(sysctl_max_syn_backlog);
 EXPORT_SYMBOL(sysctl_tcp_low_latency);
 EXPORT_SYMBOL(sysctl_tcp_tw_reuse);