[PATCH 14/26] IPVS: Extend xmit routing cache to support IPv6.

["Julius R. Volz" <juliusv@xxxxxxxxxx>]

Extend xmit destination routing cache to support lookup of IPv6
destinations.

Signed-off-by: Julius R. Volz <juliusv@xxxxxxxxxx>

 1 files changed, 74 insertions(+), 0 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index 6b6ce6b..94b8fcb 100644
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -22,6 +22,9 @@
 #include <net/udp.h>
 #include <net/icmp.h>                   /* for icmp_send */
 #include <net/route.h>                  /* for ip_route_output */
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <linux/icmpv6.h>
 #include <linux/netfilter.h>
 #include <linux/netfilter_ipv4.h>
 
@@ -59,6 +62,25 @@ __ip_vs_dst_check(struct ip_vs_dest *dest, u32 rtos, u32 
cookie)
        return dst;
 }
 
+#ifdef CONFIG_IP_VS_IPV6
+static inline struct dst_entry *
+__ip_vs_dst_check_v6(struct ip_vs_dest *dest, u32 cookie)
+{
+       struct dst_entry *dst = dest->dst_cache;
+
+       if (!dst)
+               return NULL;
+       if ((dst->obsolete) &&
+           dst->ops->check(dst, cookie) == NULL) {
+               dest->dst_cache = NULL;
+               dst_release(dst);
+               return NULL;
+       }
+       dst_hold(dst);
+       return dst;
+}
+#endif
+
 static struct rtable *
 __ip_vs_get_out_rt(struct ip_vs_conn *cp, u32 rtos)
 {
@@ -111,6 +133,58 @@ __ip_vs_get_out_rt(struct ip_vs_conn *cp, u32 rtos)
        return rt;
 }
 
+#ifdef CONFIG_IP_VS_IPV6
+static struct rt6_info *
+__ip_vs_get_out_rt_v6(struct ip_vs_conn *cp)
+{
+       struct rt6_info *rt;                    /* Route to the other host */
+       struct ip_vs_dest *dest = cp->dest;
+
+       if (dest) {
+               spin_lock(&dest->dst_lock);
+               if (!(rt = (struct rt6_info *)
+                     __ip_vs_dst_check_v6(dest, 0))) {
+                       struct flowi fl = {
+                               .oif = 0,
+                               .nl_u = {
+                                       .ip6_u = {
+                                               .daddr = dest->addr.v6,
+                                               .saddr = { .s6_addr32 = {0, 0, 
0, 0} }, } },
+                       };
+
+                       if (!(rt = (struct rt6_info 
*)ip6_route_output(&init_net, NULL, &fl))) {
+                               spin_unlock(&dest->dst_lock);
+                               IP_VS_DBG_RL("ip6_route_output error, "
+                                            "dest: " NIP6_FMT "\n",
+                                            NIP6(dest->addr.v6));
+                               return NULL;
+                       }
+                       __ip_vs_dst_set(dest, 0, dst_clone(&rt->u.dst));
+                       IP_VS_DBG(10, "new dst " NIP6_FMT ", refcnt=%d\n",
+                                 NIP6(dest->addr.v6),
+                                 atomic_read(&rt->u.dst.__refcnt));
+               }
+               spin_unlock(&dest->dst_lock);
+       } else {
+               struct flowi fl = {
+                       .oif = 0,
+                       .nl_u = {
+                               .ip6_u = {
+                                       .daddr = cp->daddr.v6,
+                                       .saddr = { .s6_addr32 = {0, 0, 0, 0}}, 
} },
+               };
+
+               if (!(rt = (struct rt6_info *)ip6_route_output(&init_net, NULL, 
&fl))) {
+                       IP_VS_DBG_RL("ip6_route_output error, dest: "
+                                    NIP6_FMT "\n", NIP6(cp->daddr.v6));
+                       return NULL;
+               }
+       }
+
+       return rt;
+}
+#endif
+
 
 /*
  *     Release dest->dst_cache before a dest is removed
-- 
1.5.3.6

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