TPROXY: fill struct flowi->flags in udp_sendmsg()

    udp_sendmsg() didn't fill struct flowi->flags, which means that
    the route lookup would fail for non-local IPs even if the
    IP_TRANSPARENT sockopt was set.

    This prevents sendto() to work properly for UDP sockets, whereas
    bind(foreign-ip) + connect() + send() worked fine.

Signed-off-by: Balazs Scheidler <bazsi@balabit.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index cf02701..98c1fd0 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -633,6 +633,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                                                .saddr = saddr,
                                                .tos = tos } },
                                    .proto = sk->sk_protocol,
+                                   .flags = inet_sk_flowi_flags(sk),
                                    .uli_u = { .ports =
                                               { .sport = inet->sport,
                                                 .dport = dport } } };