---

yaml --- r: 315517 b: refs/heads/master c: 67da22d h: refs/heads/master i: 315515: 04ce92d v: v3
git-mirror · Jul 19, 2012 · 9ac4036 · 9ac4036
1 parent 8ec9971
commit 9ac4036
Show file tree

Hide file tree

Showing 6 changed files with 16 additions and 4 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: aab4874355679c70f93993cf3b3fd74643b9ac33
+refs/heads/master: 67da22d23fa6f3324e03bcd0580b914b2e4afbf3
diff --git a/trunk/Documentation/networking/ip-sysctl.txt b/trunk/Documentation/networking/ip-sysctl.txt
@@ -476,6 +476,8 @@ tcp_fastopen - INTEGER
 
 	The values (bitmap) are:
 	1: Enables sending data in the opening SYN on the client
+	5: Enables sending data in the opening SYN on the client regardless
+	   of cookie availability.
 
 	Default: 0
 

diff --git a/trunk/include/linux/tcp.h b/trunk/include/linux/tcp.h
@@ -387,6 +387,7 @@ struct tcp_sock {
 	u8	repair_queue;
 	u8	do_early_retrans:1,/* Enable RFC5827 early-retransmit  */
 		early_retrans_delayed:1, /* Delayed ER timer installed */
+		syn_data:1,	/* SYN includes data */
 		syn_fastopen:1;	/* SYN includes Fast Open option */
 
 /* RTT measurement */

diff --git a/trunk/include/net/tcp.h b/trunk/include/net/tcp.h
@@ -214,6 +214,7 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
 
 /* Bit Flags for sysctl_tcp_fastopen */
 #define	TFO_CLIENT_ENABLE	1
+#define	TFO_CLIENT_NO_COOKIE	4	/* Data in SYN w/o cookie option */
 
 extern struct inet_timewait_death_row tcp_death_row;
 

diff --git a/trunk/net/ipv4/tcp_input.c b/trunk/net/ipv4/tcp_input.c
@@ -5650,7 +5650,7 @@ static bool tcp_rcv_fastopen_synack(struct sock *sk, struct sk_buff *synack,
 				    struct tcp_fastopen_cookie *cookie)
 {
 	struct tcp_sock *tp = tcp_sk(sk);
-	struct sk_buff *data = tcp_write_queue_head(sk);
+	struct sk_buff *data = tp->syn_data ? tcp_write_queue_head(sk) : NULL;
 	u16 mss = tp->rx_opt.mss_clamp;
 	bool syn_drop;
 
@@ -5665,6 +5665,9 @@ static bool tcp_rcv_fastopen_synack(struct sock *sk, struct sk_buff *synack,
 		mss = opt.mss_clamp;
 	}
 
+	if (!tp->syn_fastopen)  /* Ignore an unsolicited cookie */
+		cookie->len = -1;
+
 	/* The SYN-ACK neither has cookie nor acknowledges the data. Presumably
 	 * the remote receives only the retransmitted (regular) SYNs: either
 	 * the original SYN-data or the corresponding SYN-ACK is lost.
@@ -5816,7 +5819,8 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
 
 		tcp_finish_connect(sk, skb);
 
-		if (tp->syn_fastopen && tcp_rcv_fastopen_synack(sk, skb, &foc))
+		if ((tp->syn_fastopen || tp->syn_data) &&
+		    tcp_rcv_fastopen_synack(sk, skb, &foc))
 			return -1;
 
 		if (sk->sk_write_pending ||

diff --git a/trunk/net/ipv4/tcp_output.c b/trunk/net/ipv4/tcp_output.c
@@ -2864,6 +2864,7 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn)
 	struct sk_buff *syn_data = NULL, *data;
 	unsigned long last_syn_loss = 0;
 
+	tp->rx_opt.mss_clamp = tp->advmss;  /* If MSS is not cached */
 	tcp_fastopen_cache_get(sk, &tp->rx_opt.mss_clamp, &fo->cookie,
 			       &syn_loss, &last_syn_loss);
 	/* Recurring FO SYN losses: revert to regular handshake temporarily */
@@ -2873,7 +2874,9 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn)
 		goto fallback;
 	}
 
-	if (fo->cookie.len <= 0)
+	if (sysctl_tcp_fastopen & TFO_CLIENT_NO_COOKIE)
+		fo->cookie.len = -1;
+	else if (fo->cookie.len <= 0)
 		goto fallback;
 
 	/* MSS for SYN-data is based on cached MSS and bounded by PMTU and
@@ -2916,6 +2919,7 @@ static int tcp_send_syn_data(struct sock *sk, struct sk_buff *syn)
 	fo->copied = data->len;
 
 	if (tcp_transmit_skb(sk, syn_data, 0, sk->sk_allocation) == 0) {
+		tp->syn_data = (fo->copied > 0);
 		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPFASTOPENACTIVE);
 		goto done;
 	}