ipv4: Make Netfilter's ip_route_me_harder() non-local address compatible

Netfilter's ip_route_me_harder() tries to re-route packets either
generated or re-routed by Netfilter. This patch changes
ip_route_me_harder() to handle packets from non-locally-bound sockets
with IP_TRANSPARENT set as local and to set the appropriate flowi
flags when re-doing the routing lookup.

Signed-off-by: KOVACS Krisztian <hidden@sch.bme.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index d533a89e08de..d2a8f8bb78a6 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -340,6 +340,7 @@ int ip_queue_xmit(struct sk_buff *skb, int ipfragok)
                                                         .saddr = inet->saddr,
                                                         .tos = RT_CONN_FLAGS(sk) } },
                                             .proto = sk->sk_protocol,
+                                            .flags = inet_sk_flowi_flags(sk),
                                             .uli_u = { .ports =
                                                        { .sport = inet->sport,
                                                          .dport = inet->dport } } };
@@ -1371,7 +1372,8 @@ void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *ar
                                     .uli_u = { .ports =
                                                { .sport = tcp_hdr(skb)->dest,
                                                  .dport = tcp_hdr(skb)->source } },
-                                    .proto = sk->sk_protocol };
+                                    .proto = sk->sk_protocol,
+                                    .flags = ip_reply_arg_flowi_flags(arg) };
                 security_skb_classify_flow(skb, &fl);
                 if (ip_route_output_key(sock_net(sk), &rt, &fl))
                         return;