net: split rt_genid for ipv4 and ipv6

Current net name space has only one genid for both IPv4 and IPv6, it has below
drawbacks:

- Add/delete an IPv4 address will invalidate all IPv6 routing table entries.
- Insert/remove XFRM policy will also invalidate both IPv4/IPv6 routing table
  entries even when the policy is only applied for one address family.

Thus, this patch attempt to split one genid for two to cater for IPv4 and IPv6
separately in a fine granularity.

Signed-off-by: Fan Du <fan.du@windriver.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 8 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a9a54a236832..e805481eff72 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -435,12 +435,12 @@ static inline int ip_rt_proc_init(void)
 
 static inline bool rt_is_expired(const struct rtable *rth)
 {
-        return rth->rt_genid != rt_genid(dev_net(rth->dst.dev));
+        return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev));
 }
 
 void rt_cache_flush(struct net *net)
 {
-        rt_genid_bump(net);
+        rt_genid_bump_ipv4(net);
 }
 
 static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,
@@ -1458,7 +1458,7 @@ static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr,
 #endif
         rth->dst.output = ip_rt_bug;
 
-        rth->rt_genid   = rt_genid(dev_net(dev));
+        rth->rt_genid   = rt_genid_ipv4(dev_net(dev));
         rth->rt_flags   = RTCF_MULTICAST;
         rth->rt_type    = RTN_MULTICAST;
         rth->rt_is_input= 1;
@@ -1589,7 +1589,7 @@ static int __mkroute_input(struct sk_buff *skb,
                 goto cleanup;
         }
 
-        rth->rt_genid = rt_genid(dev_net(rth->dst.dev));
+        rth->rt_genid = rt_genid_ipv4(dev_net(rth->dst.dev));
         rth->rt_flags = flags;
         rth->rt_type = res->type;
         rth->rt_is_input = 1;
@@ -1760,7 +1760,7 @@ local_input:
         rth->dst.tclassid = itag;
 #endif
 
-        rth->rt_genid = rt_genid(net);
+        rth->rt_genid = rt_genid_ipv4(net);
         rth->rt_flags   = flags|RTCF_LOCAL;
         rth->rt_type    = res.type;
         rth->rt_is_input = 1;
@@ -1945,7 +1945,7 @@ add:
 
         rth->dst.output = ip_output;
 
-        rth->rt_genid = rt_genid(dev_net(dev_out));
+        rth->rt_genid = rt_genid_ipv4(dev_net(dev_out));
         rth->rt_flags   = flags;
         rth->rt_type    = type;
         rth->rt_is_input = 0;
@@ -2227,7 +2227,7 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
                 rt->rt_iif = ort->rt_iif;
                 rt->rt_pmtu = ort->rt_pmtu;
 
-                rt->rt_genid = rt_genid(net);
+                rt->rt_genid = rt_genid_ipv4(net);
                 rt->rt_flags = ort->rt_flags;
                 rt->rt_type = ort->rt_type;
                 rt->rt_gateway = ort->rt_gateway;
@@ -2665,7 +2665,7 @@ static __net_initdata struct pernet_operations sysctl_route_ops = {
 
 static __net_init int rt_genid_init(struct net *net)
 {
-        atomic_set(&net->rt_genid, 0);
+        atomic_set(&net->ipv4.rt_genid, 0);
         atomic_set(&net->fnhe_genid, 0);
         get_random_bytes(&net->ipv4.dev_addr_genid,
                          sizeof(net->ipv4.dev_addr_genid));