[PATCH 08/12] ipvs: move ip_route_me_harder for ICMP

[Julian Anastasov <ja@xxxxxx>]

        Currently, ip_route_me_harder after ip_vs_out_icmp
is called even if packet is not related to IPVS connection.
Move it into handle_response_icmp. Also, force rerouting
if sending to local client because IPv4 stack uses addresses
from the route.

Signed-off-by: Julian Anastasov <ja@xxxxxx>
---

diff -urp nf-next-2.6-a91fd26/linux/net/netfilter/ipvs/ip_vs_core.c 
linux/net/netfilter/ipvs/ip_vs_core.c
--- nf-next-2.6-a91fd26/linux/net/netfilter/ipvs/ip_vs_core.c   2010-10-16 
17:18:47.290355715 +0300
+++ linux/net/netfilter/ipvs/ip_vs_core.c       2010-10-16 17:51:57.252355662 
+0300
@@ -702,6 +702,17 @@ static int handle_response_icmp(int af,
 #endif
                ip_vs_nat_icmp(skb, pp, cp, 1);

+#ifdef CONFIG_IP_VS_IPV6
+       if (af == AF_INET6) {
+               if (sysctl_ip_vs_snat_reroute && ip6_route_me_harder(skb) != 0)
+                       goto out;
+       } else
+#endif
+               if ((sysctl_ip_vs_snat_reroute ||
+                    skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
+                   ip_route_me_harder(skb, RTN_LOCAL) != 0)
+                       goto out;
+
        /* do the statistics and put it back */
        ip_vs_out_stats(cp, skb);

@@ -940,16 +951,16 @@ handle_response(int af, struct sk_buff *
         * if it came from this machine itself.  So re-compute
         * the routing information.
         */
-       if (sysctl_ip_vs_snat_reroute) {
 #ifdef CONFIG_IP_VS_IPV6
-               if (af == AF_INET6) {
-                       if (ip6_route_me_harder(skb) != 0)
-                               goto drop;
-               } else
+       if (af == AF_INET6) {
+               if (sysctl_ip_vs_snat_reroute && ip6_route_me_harder(skb) != 0)
+                       goto drop;
+       } else
 #endif
-                       if (ip_route_me_harder(skb, RTN_LOCAL) != 0)
-                               goto drop;
-       }
+               if ((sysctl_ip_vs_snat_reroute ||
+                    skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
+                   ip_route_me_harder(skb, RTN_LOCAL) != 0)
+                       goto drop;

        IP_VS_DBG_PKT(10, pp, skb, 0, "After SNAT");

@@ -1001,13 +1012,8 @@ ip_vs_out(unsigned int hooknum, struct s
                        int verdict = ip_vs_out_icmp_v6(skb, &related,
                                                        hooknum);

-                       if (related) {
-                               if (sysctl_ip_vs_snat_reroute &&
-                                       NF_ACCEPT == verdict &&
-                                       ip6_route_me_harder(skb))
-                                       verdict = NF_DROP;
+                       if (related)
                                return verdict;
-                       }
                        ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
                }
        } else
@@ -1016,13 +1022,8 @@ ip_vs_out(unsigned int hooknum, struct s
                        int related;
                        int verdict = ip_vs_out_icmp(skb, &related, hooknum);

-                       if (related) {
-                               if (sysctl_ip_vs_snat_reroute &&
-                                       NF_ACCEPT == verdict &&
-                                       ip_route_me_harder(skb, RTN_LOCAL))
-                                       verdict = NF_DROP;
+                       if (related)
                                return verdict;
-                       }
                        ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
                }

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