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Date: Thu, 25 Jul 2013 17:47:12 +0800
From: Fan Du <fan.du@...driver.com>
To: <davem@...emloft.net>, <nicolas.dichtel@...nd.com>,
<yoshfuji@...ux-ipv6.org>, <jmorris@...ei.org>,
<steffen.klassert@...unet.com>, <hannes@...essinduktion.org>
CC: <netdev@...r.kernel.org>
Subject: [PATCH net-next v3] 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@...driver.com>
v3:
-Delete rt_genid_ipv4/ipv6 suffix
v2:
-Fix compile issue when IPv6 not enabled
-Put genid into struct netns_ipv4/ipv6
---
include/net/net_namespace.h | 39 ++++++++++++++++++++++++++++++++++-----
include/net/netns/ipv4.h | 1 +
include/net/netns/ipv6.h | 1 +
net/ipv4/route.c | 16 ++++++++--------
net/ipv6/af_inet6.c | 1 +
net/ipv6/route.c | 4 ++--
net/xfrm/xfrm_policy.c | 8 +++++++-
7 files changed, 54 insertions(+), 16 deletions(-)
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 84e37b1..2a1c546f 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -119,7 +119,6 @@ struct net {
struct netns_ipvs *ipvs;
#endif
struct sock *diag_nlsk;
- atomic_t rt_genid;
atomic_t fnhe_genid;
};
@@ -333,14 +332,44 @@ static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
}
#endif
-static inline int rt_genid(struct net *net)
+static inline int rt_genid_ipv4(struct net *net)
{
- return atomic_read(&net->rt_genid);
+ return atomic_read(&net->ipv4.rt_genid);
}
-static inline void rt_genid_bump(struct net *net)
+static inline void rt_genid_bump_ipv4(struct net *net)
{
- atomic_inc(&net->rt_genid);
+ atomic_inc(&net->ipv4.rt_genid);
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline int rt_genid_ipv6(struct net *net)
+{
+ return atomic_read(&net->ipv6.rt_genid);
+}
+
+static inline void rt_genid_bump_ipv6(struct net *net)
+{
+ atomic_inc(&net->ipv6.rt_genid);
+}
+#else
+static inline int rt_genid_ipv6(struct net *net)
+{
+ return 0;
+}
+
+static inline void rt_genid_bump_ipv6(struct net *net)
+{
+}
+#endif
+
+/* For callers who don't really care about whether it's IPv4 or IPv6 */
+static inline void rt_genid_bump_all(struct net *net)
+{
+ atomic_inc(&net->ipv4.rt_genid);
+#if IS_ENABLED(CONFIG_IPV6)
+ atomic_inc(&net->ipv6.rt_genid);
+#endif
}
static inline int fnhe_genid(struct net *net)
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 2ba9de8..bf2ec22 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -77,5 +77,6 @@ struct netns_ipv4 {
struct fib_rules_ops *mr_rules_ops;
#endif
#endif
+ atomic_t rt_genid;
};
#endif
diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index 005e2c2..0fb2401 100644
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -72,6 +72,7 @@ struct netns_ipv6 {
#endif
#endif
atomic_t dev_addr_genid;
+ atomic_t rt_genid;
};
#if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a9a54a2..e805481 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));
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index a5ac969..0d1a9b1 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -766,6 +766,7 @@ static int __net_init inet6_net_init(struct net *net)
net->ipv6.sysctl.bindv6only = 0;
net->ipv6.sysctl.icmpv6_time = 1*HZ;
+ atomic_set(&net->ipv6.rt_genid, 0);
err = ipv6_init_mibs(net);
if (err)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a8c891a..45ca9af 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -283,7 +283,7 @@ static inline struct rt6_info *ip6_dst_alloc(struct net *net,
memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
rt6_init_peer(rt, table ? &table->tb6_peers : net->ipv6.peers);
- rt->rt6i_genid = rt_genid(net);
+ rt->rt6i_genid = rt_genid_ipv6(net);
INIT_LIST_HEAD(&rt->rt6i_siblings);
rt->rt6i_nsiblings = 0;
}
@@ -1062,7 +1062,7 @@ static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
* DST_OBSOLETE_FORCE_CHK which forces validation calls down
* into this function always.
*/
- if (rt->rt6i_genid != rt_genid(dev_net(rt->dst.dev)))
+ if (rt->rt6i_genid != rt_genid_ipv6(dev_net(rt->dst.dev)))
return NULL;
if (rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index e52cab3..d8da6b8 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -660,7 +660,13 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
xfrm_pol_hold(policy);
net->xfrm.policy_count[dir]++;
atomic_inc(&flow_cache_genid);
- rt_genid_bump(net);
+
+ /* After previous checking, family can either be AF_INET or AF_INET6 */
+ if (policy->family == AF_INET)
+ rt_genid_bump_ipv4(net);
+ else
+ rt_genid_bump_ipv6(net);
+
if (delpol) {
xfrm_policy_requeue(delpol, policy);
__xfrm_policy_unlink(delpol, dir);
--
1.7.9.5
--
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