unix_diag: Unix socket name NLA
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>
diff --git a/include/linux/unix_diag.h b/include/linux/unix_diag.h
index 445184a..cc4df34 100644
--- a/include/linux/unix_diag.h
+++ b/include/linux/unix_diag.h
@@ -11,6 +11,8 @@
__u32 udiag_cookie[2];
};
+#define UDIAG_SHOW_NAME 0x00000001 /* show name (not path) */
+
struct unix_diag_msg {
__u8 udiag_family;
__u8 udiag_type;
@@ -21,4 +23,10 @@
__u32 udiag_cookie[2];
};
+enum {
+ UNIX_DIAG_NAME,
+
+ UNIX_DIAG_MAX,
+};
+
#endif
diff --git a/net/unix/diag.c b/net/unix/diag.c
index d7bd48c..161ce6c 100644
--- a/net/unix/diag.c
+++ b/net/unix/diag.c
@@ -10,6 +10,22 @@
#define UNIX_DIAG_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,
u32 pid, u32 seq, u32 flags, int sk_ino)
{
@@ -28,6 +44,10 @@
rep->udiag_ino = sk_ino;
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;
return skb->len;