1 files changed, 28 insertions, 0 deletions

diff --git a/include/net/tcp.h b/include/net/tcp.h
index b92bdc7c92a9..0a4ed6e85c6f 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -719,6 +719,34 @@ static inline void tcp_ca_event(struct sock *sk, const enum tcp_ca_event event)
                 icsk->icsk_ca_ops->cwnd_event(sk, event);
 }
 
+/* These functions determine how the current flow behaves in respect of SACK
+ * handling. SACK is negotiated with the peer, and therefore it can vary
+ * between different flows.
+ *
+ * tcp_is_sack - SACK enabled
+ * tcp_is_reno - No SACK
+ * tcp_is_fack - FACK enabled, implies SACK enabled
+ */
+static inline int tcp_is_sack(const struct tcp_sock *tp)
+{
+        return tp->rx_opt.sack_ok;
+}
+
+static inline int tcp_is_reno(const struct tcp_sock *tp)
+{
+        return !tcp_is_sack(tp);
+}
+
+static inline int tcp_is_fack(const struct tcp_sock *tp)
+{
+        return tp->rx_opt.sack_ok & 2;
+}
+
+static inline void tcp_enable_fack(struct tcp_sock *tp)
+{
+        tp->rx_opt.sack_ok |= 2;
+}
+
 static inline unsigned int tcp_left_out(const struct tcp_sock *tp)
 {
         return tp->sacked_out + tp->lost_out;