X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Fnet%2Ftcp.h;h=19f4150f4d4d166380f95079c1877af28e6d62a5;hb=22f6dacdfcfdc792d068e9c41234808860498d04;hp=1b94b9bfe2dc13754d4c2f6f4c9e26efd8b8c130;hpb=22ae77bc7ac115b9d518d5cbc13d39317079b2b0;p=pandora-kernel.git

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 1b94b9bfe2dc..19f4150f4d4d 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -41,6 +41,7 @@
 #include <net/ip.h>
 #include <net/tcp_states.h>
 #include <net/inet_ecn.h>
+#include <net/dst.h>
 
 #include <linux/seq_file.h>
 
@@ -265,6 +266,19 @@ static inline int tcp_too_many_orphans(struct sock *sk, int num)
 		 atomic_read(&tcp_memory_allocated) > sysctl_tcp_mem[2]);
 }
 
+/* syncookies: remember time of last synqueue overflow */
+static inline void tcp_synq_overflow(struct sock *sk)
+{
+	tcp_sk(sk)->rx_opt.ts_recent_stamp = jiffies;
+}
+
+/* syncookies: no recent synqueue overflow on this listening socket? */
+static inline int tcp_synq_no_recent_overflow(const struct sock *sk)
+{
+	unsigned long last_overflow = tcp_sk(sk)->rx_opt.ts_recent_stamp;
+	return time_after(jiffies, last_overflow + TCP_TIMEOUT_INIT);
+}
+
 extern struct proto tcp_prot;
 
 #define TCP_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.tcp_statistics, field)
@@ -530,6 +544,17 @@ static inline void tcp_fast_path_check(struct sock *sk)
 		tcp_fast_path_on(tp);
 }
 
+/* Compute the actual rto_min value */
+static inline u32 tcp_rto_min(struct sock *sk)
+{
+	struct dst_entry *dst = __sk_dst_get(sk);
+	u32 rto_min = TCP_RTO_MIN;
+
+	if (dst && dst_metric_locked(dst, RTAX_RTO_MIN))
+		rto_min = dst_metric_rtt(dst, RTAX_RTO_MIN);
+	return rto_min;
+}
+
 /* Compute the actual receive window we are currently advertising.
  * Rcv_nxt can be after the window if our peer push more data
  * than the offered window.
@@ -877,30 +902,32 @@ static inline int tcp_prequeue(struct sock *sk, struct sk_buff *skb)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
 
-	if (!sysctl_tcp_low_latency && tp->ucopy.task) {
-		__skb_queue_tail(&tp->ucopy.prequeue, skb);
-		tp->ucopy.memory += skb->truesize;
-		if (tp->ucopy.memory > sk->sk_rcvbuf) {
-			struct sk_buff *skb1;
-
-			BUG_ON(sock_owned_by_user(sk));
-
-			while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) {
-				sk_backlog_rcv(sk, skb1);
-				NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_TCPPREQUEUEDROPPED);
-			}
-
-			tp->ucopy.memory = 0;
-		} else if (skb_queue_len(&tp->ucopy.prequeue) == 1) {
-			wake_up_interruptible(sk->sk_sleep);
-			if (!inet_csk_ack_scheduled(sk))
-				inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
-						          (3 * TCP_RTO_MIN) / 4,
-							  TCP_RTO_MAX);
+	if (sysctl_tcp_low_latency || !tp->ucopy.task)
+		return 0;
+
+	__skb_queue_tail(&tp->ucopy.prequeue, skb);
+	tp->ucopy.memory += skb->truesize;
+	if (tp->ucopy.memory > sk->sk_rcvbuf) {
+		struct sk_buff *skb1;
+
+		BUG_ON(sock_owned_by_user(sk));
+
+		while ((skb1 = __skb_dequeue(&tp->ucopy.prequeue)) != NULL) {
+			sk_backlog_rcv(sk, skb1);
+			NET_INC_STATS_BH(sock_net(sk),
+					 LINUX_MIB_TCPPREQUEUEDROPPED);
 		}
-		return 1;
+
+		tp->ucopy.memory = 0;
+	} else if (skb_queue_len(&tp->ucopy.prequeue) == 1) {
+		wake_up_interruptible_poll(sk->sk_sleep,
+					   POLLIN | POLLRDNORM | POLLRDBAND);
+		if (!inet_csk_ack_scheduled(sk))
+			inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
+						  (3 * tcp_rto_min(sk)) / 4,
+						  TCP_RTO_MAX);
 	}
-	return 0;
+	return 1;
 }