diff options
| author | David Ahern <dsahern@gmail.com> | 2019-04-09 14:41:16 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-04-11 14:24:06 -0700 |
| commit | af52a52cbabd8751154483dc8e6685a28746970f (patch) | |
| tree | dd7bfb604d96ef13f43e6aeb480c320600452503 /net/ipv6/route.c | |
| parent | 30c15f033847c519bae4a3dc23320e1fbee868eb (diff) | |
ipv6: Be smarter with null_entry handling in ip6_pol_route_lookup
Clean up the fib6_null_entry handling in ip6_pol_route_lookup.
rt6_device_match can return fib6_null_entry, but fib6_multipath_select
can not. Consolidate the fib6_null_entry handling and on the final
null_entry check set rt and goto out - no need to defer to a second
check after rt6_find_cached_rt.
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/route.c')
| -rw-r--r-- | net/ipv6/route.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 52aa48a8dbda..0745ed872e5b 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1062,36 +1062,37 @@ static struct rt6_info *ip6_pol_route_lookup(struct net *net, fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); restart: f6i = rcu_dereference(fn->leaf); - if (!f6i) { + if (!f6i) f6i = net->ipv6.fib6_null_entry; - } else { + else f6i = rt6_device_match(net, f6i, &fl6->saddr, fl6->flowi6_oif, flags); - if (f6i->fib6_nsiblings && fl6->flowi6_oif == 0) - f6i = fib6_multipath_select(net, f6i, fl6, - fl6->flowi6_oif, skb, - flags); - } + if (f6i == net->ipv6.fib6_null_entry) { fn = fib6_backtrack(fn, &fl6->saddr); if (fn) goto restart; - } - trace_fib6_table_lookup(net, f6i, table, fl6); + rt = net->ipv6.ip6_null_entry; + dst_hold(&rt->dst); + goto out; + } + if (f6i->fib6_nsiblings && fl6->flowi6_oif == 0) + f6i = fib6_multipath_select(net, f6i, fl6, fl6->flowi6_oif, skb, + flags); /* Search through exception table */ rt = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr); if (rt) { if (ip6_hold_safe(net, &rt)) dst_use_noref(&rt->dst, jiffies); - } else if (f6i == net->ipv6.fib6_null_entry) { - rt = net->ipv6.ip6_null_entry; - dst_hold(&rt->dst); } else { rt = ip6_create_rt_rcu(f6i); } +out: + trace_fib6_table_lookup(net, f6i, table, fl6); + rcu_read_unlock(); return rt; |