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ipv6: keep track of routes using src

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Use a per namespace counter, increment it on successful creation
of any route using the source address, decrement it on deletion
of such routes.

This allows us to check easily if the routing decision in the
current namespace depends on the packet source. Will be used
by the next patch.

Suggested-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni
2019-11-20 13:47:34 +01:00
committed by David S. Miller
parent 1f8ac57030
commit b9b33e7c24
4 changed files with 40 additions and 0 deletions
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3
net/ipv6/route.c
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@@ -6199,6 +6199,9 @@ static int __net_init ip6_route_net_init(struct net *net)
dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
ip6_template_metrics, true);
INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
#ifdef CONFIG_IPV6_SUBTREES
net->ipv6.fib6_routes_require_src = 0;
#endif
#endif
net->ipv6.sysctl.flush_delay = 0;