sock_diag: add SK_MEMINFO_BACKLOG

Adding socket backlog len in INET_DIAG_SKMEMINFO is really useful to
diagnose various TCP problems.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/sock_diag.h b/include/linux/sock_diag.h
index db4bae78bda9..6793fac5eab5 100644
--- a/include/linux/sock_diag.h
+++ b/include/linux/sock_diag.h
@@ -18,6 +18,7 @@ enum {
         SK_MEMINFO_FWD_ALLOC,
         SK_MEMINFO_WMEM_QUEUED,
         SK_MEMINFO_OPTMEM,
+        SK_MEMINFO_BACKLOG,
 
         SK_MEMINFO_VARS,
 };
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index 5fd146720f39..0d934ce1075f 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -46,6 +46,7 @@ int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
         mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
         mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
         mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
+        mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
 
         return 0;