diff options
| author | Wei Wang <weiwan@google.com> | 2017-06-17 10:42:26 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-17 22:53:59 -0400 |
| commit | 1dbe32525e26ec28d2cc17f65a90fc7b53f1f8d0 (patch) | |
| tree | c8de21d5e5503a6cf665c658b012c6d28c1345dc | |
| parent | d24406c85d123df773bc4df88ad5da2233896919 (diff) | |
| download | linux-1dbe32525e26ec28d2cc17f65a90fc7b53f1f8d0.tar.bz2 | |
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>
| -rw-r--r-- | net/ipv4/route.c | 2 | ||||
| -rw-r--r-- | net/ipv6/route.c | 9 |
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; |