tcp: Replace constants with #define macros

to record the state of SACK/FACK and DSACK for better readability and maintenance.

Signed-off-by: Vijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 11 insertions, 6 deletions

diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 7f59ee94698..46a85c9e1f2 100644
--- a/include/linux/tcp.h
+++ b/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/include/net/tcp.h b/include/net/tcp.h
index a4f52e15484..0118ea999f6 100644
--- a/include/net/tcp.h
+++ b/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/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index 90f6544c13e..51fdbb49043 100644
--- a/net/ipv4/syncookies.c
+++ b/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/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index f131d92d25e..2877c3e0958 100644
--- a/net/ipv4/tcp_input.c
+++ b/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;