[NETLINK]: Mirror UDP MSG_TRUNC semantics.

If the user passes MSG_TRUNC in via msg_flags, return the full packet size not the truncated size. Idea from Herbert Xu and Thomas Graf. Signed-off-by: David S. Miller <davem@davemloft.net>
mariux64 · Apr 26, 2007 · b558ff7 · b558ff7
1 parent b7aa0bf
commit b558ff7
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
@@ -1242,6 +1242,9 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
 
 	scm_recv(sock, msg, siocb->scm, flags);
 
+	if (flags & MSG_TRUNC)
+		copied = skb->len;
+
 out:
 	netlink_rcv_wake(sk);
 	return err ? : copied;