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authorPaolo Abeni <pabeni@redhat.com>2019-11-20 13:47:34 +0100
committerDavid S. Miller <davem@davemloft.net>2019-11-21 14:45:55 -0800
commitb9b33e7c24af1cddc7697056f1664279a40d9a4a (patch)
tree0bd274edeababf25ed5d1c9d76b180984e787afa /net/ipv6
parent1f8ac5703037fdd2e6c960cd35c2b14d18ef3933 (diff)
ipv6: keep track of routes using src
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>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/ip6_fib.c4
-rw-r--r--net/ipv6/route.c3
2 files changed, 7 insertions, 0 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index f66bc2af4e9d..7bae6a91b487 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1461,6 +1461,8 @@ out:
}
#endif
goto failure;
+ } else if (fib6_requires_src(rt)) {
+ fib6_routes_require_src_inc(info->nl_net);
}
return err;
@@ -1933,6 +1935,8 @@ int fib6_del(struct fib6_info *rt, struct nl_info *info)
struct fib6_info *cur = rcu_dereference_protected(*rtp,
lockdep_is_held(&table->tb6_lock));
if (rt == cur) {
+ if (fib6_requires_src(cur))
+ fib6_routes_require_src_dec(info->nl_net);
fib6_del_route(table, fn, rtp, info);
return 0;
}
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index edcb52543518..c92b367e058d 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -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;