tcp: accept SOF_TIMESTAMPING_OPT_ID for passive TFO

SOF_TIMESTAMPING_OPT_ID is set to get data-independent IDs
to associate timestamps with send calls. For TCP connections,
tp->snd_una is used as the starting point to calculate
relative IDs.

This socket option will fail if set before the handshake on a
passive TCP fast open connection with data in SYN or SYN/ACK,
since setsockopt requires the connection to be in the
ESTABLISHED state.

To address these, instead of limiting the option to the
ESTABLISHED state, accept the SOF_TIMESTAMPING_OPT_ID option as
long as the connection is not in LISTEN or CLOSE states.

Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/sock.c b/net/core/sock.c
index 66976f8..0a64fe2 100644 (file)
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -832,7 +832,8 @@ set_rcvbuf:
                    !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) {
                        if (sk->sk_protocol == IPPROTO_TCP &&
                            sk->sk_type == SOCK_STREAM) {
-                               if (sk->sk_state != TCP_ESTABLISHED) {
+                               if ((1 << sk->sk_state) &
+                                   (TCPF_CLOSE | TCPF_LISTEN)) {
                                        ret = -EINVAL;
                                        break;
                                }