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unix_diag: Unix peer inode NLA

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Report the peer socket inode ID as NLA. With this it's finally
possible to find out the other end of an interesting unix connection.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2011-12-15 02:45:58 +00:00 committed by David S. Miller
parent 5f7b056946
commit ac02be8d96
2 changed files with 26 additions and 0 deletions
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2
include/linux/unix_diag.h
View file

@ -13,6 +13,7 @@ struct unix_diag_req {
#define UDIAG_SHOW_NAME 0x00000001 /* show name (not path) */
#define UDIAG_SHOW_VFS 0x00000002 /* show VFS inode info */
#define UDIAG_SHOW_PEER 0x00000004 /* show peer socket info */
struct unix_diag_msg {
__u8 udiag_family;
@ -27,6 +28,7 @@ struct unix_diag_msg {
enum {
UNIX_DIAG_NAME,
UNIX_DIAG_VFS,
UNIX_DIAG_PEER,
UNIX_DIAG_MAX,
};

24
net/unix/diag.c
View file

@ -43,6 +43,26 @@ static int sk_diag_dump_vfs(struct sock *sk, struct sk_buff *nlskb)
return -EMSGSIZE;
}
static int sk_diag_dump_peer(struct sock *sk, struct sk_buff *nlskb)
{
struct sock *peer;
int ino;
peer = unix_peer_get(sk);
if (peer) {
unix_state_lock(peer);
ino = sock_i_ino(peer);
unix_state_unlock(peer);
sock_put(peer);
RTA_PUT_U32(nlskb, UNIX_DIAG_PEER, ino);
}
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)
{
@ -69,6 +89,10 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_r
sk_diag_dump_vfs(sk, skb))
goto nlmsg_failure;
if ((req->udiag_show & UDIAG_SHOW_PEER) &&
sk_diag_dump_peer(sk, skb))
goto nlmsg_failure;
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
return skb->len;