[TCP]: Return useful listenq info in tcp_info and INET_DIAG_INFO.

Return some useful information such as the maximum listen backlog and
the current listen backlog in the tcp_info structure and
INET_DIAG_INFO.

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
index 57c5f0b10e6c..3904d2158a92 100644
--- a/net/ipv4/tcp_diag.c
+++ b/net/ipv4/tcp_diag.c
@@ -25,11 +25,13 @@ static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
         const struct tcp_sock *tp = tcp_sk(sk);
         struct tcp_info *info = _info;
 
-        if (sk->sk_state == TCP_LISTEN)
+        if (sk->sk_state == TCP_LISTEN) {
                 r->idiag_rqueue = sk->sk_ack_backlog;
-        else
+                r->idiag_wqueue = sk->sk_max_ack_backlog;
+        } else {
                 r->idiag_rqueue = tp->rcv_nxt - tp->copied_seq;
-        r->idiag_wqueue = tp->write_seq - tp->snd_una;
+                r->idiag_wqueue = tp->write_seq - tp->snd_una;
+        }
         if (info != NULL)
                 tcp_get_info(sk, info);
 }