unix_diag: Unix inode info NLA
Actually, the socket path if it's not anonymous doesn't give
a clue to which file the socket is bound to. Even if the path
is absolute, it can be unlinked and then new socket can be
bound to it.
With this NLA it's possible to check which file a particular
socket is really bound to.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/unix/diag.c b/net/unix/diag.c
index 161ce6c..83799ef1 100644
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -26,6 +26,23 @@
return -EMSGSIZE;
}
+static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
+{
+ struct dentry *dentry = unix_sk(sk)->dentry;
+ struct unix_diag_vfs *uv;
+
+ if (dentry) {
+ uv = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_VFS, sizeof(*uv));
+ uv->udiag_vfs_ino = dentry->d_inode->i_ino;
+ uv->udiag_vfs_dev = dentry->d_sb->s_dev;
+ }
+
+ 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)
{
@@ -48,6 +65,10 @@
sk_diag_dump_name(sk, skb))
goto nlmsg_failure;
+ if ((req->udiag_show & UDIAG_SHOW_VFS) &&
+ sk_diag_dump_vfs(sk, skb))
+ goto nlmsg_failure;
+
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
return skb->len;