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net: split rt_genid for ipv4 and ipv6

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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>
This commit is contained in:
fan.du
2013-07-30 08:33:53 +08:00
committed by David S. Miller
parent ba361cb3d4
commit ca4c3fc24e
8 changed files with 58 additions and 17 deletions
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8
net/xfrm/xfrm_policy.c
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@@ -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);