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unix_diag: Unix socket name NLA

Browse source 
Report the sun_path when requested as NLA. With leading '\0' if
present but without the leading AF_UNIX bits.

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 02:45:24 +00:00 • committed by David S. Miller
parent 5d3cae8bc3
commit f5248b48a6
2 changed files with 28 additions and 0 deletions
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8
include/linux/unix_diag.h
View file

@ -11,6 +11,8 @@ struct unix_diag_req {
__u32 udiag_cookie[2]; __u32 udiag_cookie[2];
}; };
#define UDIAG_SHOW_NAME 0x00000001 /* show name (not path) */
struct unix_diag_msg { struct unix_diag_msg {
__u8 udiag_family; __u8 udiag_family;
__u8 udiag_type; __u8 udiag_type;
@ -21,4 +23,10 @@ struct unix_diag_msg {
__u32 udiag_cookie[2]; __u32 udiag_cookie[2];
}; };
enum {
UNIX_DIAG_NAME,
UNIX_DIAG_MAX,
};
#endif #endif

20
net/unix/diag.c
View file

@ -10,6 +10,22 @@
#define UNIX_DIAG_PUT(skb, attrtype, attrlen) \ #define UNIX_DIAG_PUT(skb, attrtype, attrlen) \
RTA_DATA(__RTA_PUT(skb, attrtype, attrlen)) RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
static int sk_diag_dump_name(struct sock *sk, struct sk_buff *nlskb)
{
struct unix_address *addr = unix_sk(sk)->addr;
char *s;
if (addr) {
s = UNIX_DIAG_PUT(nlskb, UNIX_DIAG_NAME, addr->len - sizeof(short));
memcpy(s, addr->name->sun_path, addr->len - sizeof(short));
}
return 0;
rtattr_failure:
return -EMSGSIZE;
}
static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_req *req, 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) u32 pid, u32 seq, u32 flags, int sk_ino)
{ {
@ -28,6 +44,10 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct unix_diag_r
rep->udiag_ino = sk_ino; rep->udiag_ino = sk_ino;
sock_diag_save_cookie(sk, rep->udiag_cookie); sock_diag_save_cookie(sk, rep->udiag_cookie);
if ((req->udiag_show & UDIAG_SHOW_NAME) &&
sk_diag_dump_name(sk, skb))
goto nlmsg_failure;
nlh->nlmsg_len = skb_tail_pointer(skb) - b; nlh->nlmsg_len = skb_tail_pointer(skb) - b;
return skb->len; return skb->len;