1 files changed, 24 insertions, 3 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index fe4582ca969a..766c59658563 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -212,6 +212,26 @@ int inet_listen(struct socket *sock, int backlog)
          * we can only allow the backlog to be adjusted.
          */
         if (old_state != TCP_LISTEN) {
+                /* Check special setups for testing purpose to enable TFO w/o
+                 * requiring TCP_FASTOPEN sockopt.
+                 * Note that only TCP sockets (SOCK_STREAM) will reach here.
+                 * Also fastopenq may already been allocated because this
+                 * socket was in TCP_LISTEN state previously but was
+                 * shutdown() (rather than close()).
+                 */
+                if ((sysctl_tcp_fastopen & TFO_SERVER_ENABLE) != 0 &&
+                    inet_csk(sk)->icsk_accept_queue.fastopenq == NULL) {
+                        if ((sysctl_tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) != 0)
+                                err = fastopen_init_queue(sk, backlog);
+                        else if ((sysctl_tcp_fastopen &
+                                  TFO_SERVER_WO_SOCKOPT2) != 0)
+                                err = fastopen_init_queue(sk,
+                                    ((uint)sysctl_tcp_fastopen) >> 16);
+                        else
+                                err = 0;
+                        if (err)
+                                goto out;
+                }
                 err = inet_csk_listen_start(sk, backlog);
                 if (err)
                         goto out;
@@ -701,7 +721,8 @@ int inet_accept(struct socket *sock, struct socket *newsock, int flags)
 
         sock_rps_record_flow(sk2);
         WARN_ON(!((1 << sk2->sk_state) &
-                  (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
+                  (TCPF_ESTABLISHED | TCPF_SYN_RECV |
+                  TCPF_CLOSE_WAIT | TCPF_CLOSE)));
 
         sock_graft(sk2, newsock);
 
@@ -1364,7 +1385,7 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head,
         if (*(u8 *)iph != 0x45)
                 goto out_unlock;
 
-        if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
+        if (unlikely(ip_fast_csum((u8 *)iph, 5)))
                 goto out_unlock;
 
         id = ntohl(*(__be32 *)&iph->id);
@@ -1380,7 +1401,6 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head,
                 iph2 = ip_hdr(p);
 
                 if ((iph->protocol ^ iph2->protocol) |
-                    (iph->tos ^ iph2->tos) |
                     ((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
                     ((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
                         NAPI_GRO_CB(p)->same_flow = 0;
@@ -1390,6 +1410,7 @@ static struct sk_buff **inet_gro_receive(struct sk_buff **head,
                 /* All fields must match except length and checksum. */
                 NAPI_GRO_CB(p)->flush |=
                         (iph->ttl ^ iph2->ttl) |
+                        (iph->tos ^ iph2->tos) |
                         ((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
 
                 NAPI_GRO_CB(p)->flush |= flush;