Allow tcp_parse_options to consult dst entry

We need tcp_parse_options to be aware of dst_entry to
take into account per dst_entry TCP options settings

Signed-off-by: Gilad Ben-Yossef <gilad@codefidence.com>
Sigend-off-by: Ori Finkelman <ori@comsleep.com>
Sigend-off-by: Yony Amit <yony@comsleep.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index a0c3700bae3a..c7625005486d 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3698,12 +3698,14 @@ old_ack:
  * the fast version below fails.
  */
 void tcp_parse_options(struct sk_buff *skb, struct tcp_options_received *opt_rx,
-                       int estab)
+                       int estab,  struct dst_entry *dst)
 {
         unsigned char *ptr;
         struct tcphdr *th = tcp_hdr(skb);
         int length = (th->doff * 4) - sizeof(struct tcphdr);
 
+        BUG_ON(!estab && !dst);
+
         ptr = (unsigned char *)(th + 1);
         opt_rx->saw_tstamp = 0;
 
@@ -3820,7 +3822,7 @@ static int tcp_fast_parse_options(struct sk_buff *skb, struct tcphdr *th,
                 if (tcp_parse_aligned_timestamp(tp, th))
                         return 1;
         }
-        tcp_parse_options(skb, &tp->rx_opt, 1);
+        tcp_parse_options(skb, &tp->rx_opt, 1, NULL);
         return 1;
 }
 
@@ -5364,8 +5366,9 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
         struct tcp_sock *tp = tcp_sk(sk);
         struct inet_connection_sock *icsk = inet_csk(sk);
         int saved_clamp = tp->rx_opt.mss_clamp;
+        struct dst_entry *dst = __sk_dst_get(sk);
 
-        tcp_parse_options(skb, &tp->rx_opt, 0);
+        tcp_parse_options(skb, &tp->rx_opt, 0, dst);
 
         if (th->ack) {
                 /* rfc793: