---

yaml --- r: 279038 b: refs/heads/master c: ab56222 h: refs/heads/master v: v3
git-mirror · Dec 21, 2011 · 2acdc7f · 2acdc7f
1 parent 6697331
commit 2acdc7f
Show file tree

Hide file tree

Showing 5 changed files with 12 additions and 7 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 08f4fc9da9a04d59f5c937e06e375158abb68206
+refs/heads/master: ab56222a32b9dbaae19c1d37f07b0ac4fc3c27ec
diff --git a/trunk/include/linux/tcp.h b/trunk/include/linux/tcp.h
@@ -238,6 +238,11 @@ struct tcp_sack_block {
 	u32	end_seq;
 };
 
+/*These are used to set the sack_ok field in struct tcp_options_received */
+#define TCP_SACK_SEEN     (1 << 0)   /*1 = peer is SACK capable, */
+#define TCP_FACK_ENABLED  (1 << 1)   /*1 = FACK is enabled locally*/
+#define TCP_DSACK_SEEN    (1 << 2)   /*1 = DSACK was received from peer*/
+
 struct tcp_options_received {
 /*	PAWS/RTTM data	*/
 	long	ts_recent_stamp;/* Time we stored ts_recent (for aging) */

diff --git a/trunk/include/net/tcp.h b/trunk/include/net/tcp.h
@@ -773,12 +773,12 @@ static inline int tcp_is_reno(const struct tcp_sock *tp)
 
 static inline int tcp_is_fack(const struct tcp_sock *tp)
 {
-	return tp->rx_opt.sack_ok & 2;
+	return tp->rx_opt.sack_ok & TCP_FACK_ENABLED;
 }
 
 static inline void tcp_enable_fack(struct tcp_sock *tp)
 {
-	tp->rx_opt.sack_ok |= 2;
+	tp->rx_opt.sack_ok |= TCP_FACK_ENABLED;
 }
 
 static inline unsigned int tcp_left_out(const struct tcp_sock *tp)

diff --git a/trunk/net/ipv4/syncookies.c b/trunk/net/ipv4/syncookies.c
@@ -245,7 +245,7 @@ bool cookie_check_timestamp(struct tcp_options_received *tcp_opt, bool *ecn_ok)
 	if (!sysctl_tcp_timestamps)
 		return false;
 
-	tcp_opt->sack_ok = (options >> 4) & 0x1;
+	tcp_opt->sack_ok = (options & (1 << 4)) ? TCP_SACK_SEEN : 0;
 	*ecn_ok = (options >> 5) & 1;
 	if (*ecn_ok && !sysctl_tcp_ecn)
 		return false;

diff --git a/trunk/net/ipv4/tcp_input.c b/trunk/net/ipv4/tcp_input.c
@@ -865,13 +865,13 @@ static void tcp_disable_fack(struct tcp_sock *tp)
 	/* RFC3517 uses different metric in lost marker => reset on change */
 	if (tcp_is_fack(tp))
 		tp->lost_skb_hint = NULL;
-	tp->rx_opt.sack_ok &= ~2;
+	tp->rx_opt.sack_ok &= ~TCP_FACK_ENABLED;
 }
 
 /* Take a notice that peer is sending D-SACKs */
 static void tcp_dsack_seen(struct tcp_sock *tp)
 {
-	tp->rx_opt.sack_ok |= 4;
+	tp->rx_opt.sack_ok |= TCP_DSACK_SEEN;
 }
 
 /* Initialize metrics on socket. */
@@ -3878,7 +3878,7 @@ void tcp_parse_options(const struct sk_buff *skb, struct tcp_options_received *o
 			case TCPOPT_SACK_PERM:
 				if (opsize == TCPOLEN_SACK_PERM && th->syn &&
 				    !estab && sysctl_tcp_sack) {
-					opt_rx->sack_ok = 1;
+					opt_rx->sack_ok = TCP_SACK_SEEN;
 					tcp_sack_reset(opt_rx);
 				}
 				break;