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authorWei Wang <weiwan@google.com>2017-06-17 10:42:26 -0700
committerDavid S. Miller <davem@davemloft.net>2017-06-17 22:53:59 -0400
commit1dbe32525e26ec28d2cc17f65a90fc7b53f1f8d0 (patch)
treec8de21d5e5503a6cf665c658b012c6d28c1345dc /net
parentd24406c85d123df773bc4df88ad5da2233896919 (diff)
net: use loopback dev when generating blackhole route
Existing ipv4/6_blackhole_route() code generates a blackhole route with dst->dev pointing to the passed in dst->dev. It is not necessary to hold reference to the passed in dst->dev because the packets going through this route are dropped anyway. A loopback interface is good enough so that we don't need to worry about releasing this dst->dev when this dev is going down. Signed-off-by: Wei Wang <weiwan@google.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/route.c2
-rw-r--r--net/ipv6/route.c9
2 files changed, 6 insertions, 5 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 9b38cf18144e..0a843ef2b709 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2504,7 +2504,7 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
new->input = dst_discard;
new->output = dst_discard_out;
- new->dev = ort->dst.dev;
+ new->dev = net->loopback_dev;
if (new->dev)
dev_hold(new->dev);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 18fe6e2b88d5..bc1bc91bb969 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1245,9 +1245,12 @@ EXPORT_SYMBOL_GPL(ip6_route_output_flags);
struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
{
struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
+ struct net_device *loopback_dev = net->loopback_dev;
struct dst_entry *new = NULL;
- rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
+
+ rt = dst_alloc(&ip6_dst_blackhole_ops, loopback_dev, 1,
+ DST_OBSOLETE_NONE, 0);
if (rt) {
rt6_info_init(rt);
@@ -1257,10 +1260,8 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
new->output = dst_discard_out;
dst_copy_metrics(new, &ort->dst);
- rt->rt6i_idev = ort->rt6i_idev;
- if (rt->rt6i_idev)
- in6_dev_hold(rt->rt6i_idev);
+ rt->rt6i_idev = in6_dev_get(loopback_dev);
rt->rt6i_gateway = ort->rt6i_gateway;
rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
rt->rt6i_metric = 0;