unix_diag: Receive queue lenght NLA

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/unix_diag.h b/include/linux/unix_diag.h
index 03ffb7d..3f7afb0 100644 (file)
--- a/include/linux/unix_diag.h
+++ b/include/linux/unix_diag.h
@@ -15,6 +15,7 @@ struct unix_diag_req {
 #define UDIAG_SHOW_VFS         0x00000002      /* show VFS inode info */
 #define UDIAG_SHOW_PEER                0x00000004      /* show peer socket info */
 #define UDIAG_SHOW_ICONS       0x00000008      /* show pending connections */
+#define UDIAG_SHOW_RQLEN       0x00000010      /* show skb receive queue len */
 
 struct unix_diag_msg {
        __u8    udiag_family;
@@ -31,6 +32,7 @@ enum {
        UNIX_DIAG_VFS,
        UNIX_DIAG_PEER,
        UNIX_DIAG_ICONS,
+       UNIX_DIAG_RQLEN,
 
        UNIX_DIAG_MAX,
 };

diff --git a/net/unix/diag.c b/net/unix/diag.c
index 24c7a65..a5c4aab 100644 (file)
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -98,6 +98,15 @@ rtattr_failure:
        return -EMSGSIZE;
 }
 
+static int sk_diag_show_rqlen(struct sock *sk, struct sk_buff *nlskb)
+{
+       RTA_PUT_U32(nlskb, UNIX_DIAG_RQLEN, sk->sk_receive_queue.qlen);
+       return 0;
+
+rtattr_failure:
+       return -EMSGSIZE;
+}
+
 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req,
                u32 pid, u32 seq, u32 flags, int sk_ino)
 {
@@ -132,6 +141,10 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_r
                        sk_diag_dump_icons(sk, skb))
                goto nlmsg_failure;
 
+       if ((req->udiag_show & UDIAG_SHOW_RQLEN) &&
+                       sk_diag_show_rqlen(sk, skb))
+               goto nlmsg_failure;
+
        nlh->nlmsg_len = skb_tail_pointer(skb) - b;
        return skb->len;