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net/ipv6: Add rt6_info create function for ip6_pol_route_lookup

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ip6_pol_route_lookup is the lookup function for ip6_route_lookup and
rt6_lookup. At the moment it returns either a reference to a FIB entry
or a cached exception. To move FIB entries to a separate struct, this
lookup function needs to convert FIB entries to an rt6_info that is
returned to the caller.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-04-17 17:33:19 -07:00 committed by David S. Miller
parent 421842edea
commit dec9b0e295
1 changed files with 25 additions and 4 deletions
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29
net/ipv6/route.c
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@ -1055,6 +1055,19 @@ static bool ip6_hold_safe(struct net *net, struct rt6_info **prt,
return false;
}
/* called with rcu_lock held */
static struct rt6_info *ip6_create_rt_rcu(struct rt6_info *rt)
{
struct net_device *dev = rt->fib6_nh.nh_dev;
struct rt6_info *nrt;
nrt = __ip6_dst_alloc(dev_net(dev), dev, 0);
if (nrt)
ip6_rt_copy_init(nrt, rt);
return nrt;
}
static struct rt6_info *ip6_pol_route_lookup(struct net *net,
struct fib6_table *table,
struct flowi6 *fl6,
@ -1087,18 +1100,26 @@ restart:
}
/* Search through exception table */
rt_cache = rt6_find_cached_rt(rt, &fl6->daddr, &fl6->saddr);
if (rt_cache)
if (rt_cache) {
rt = rt_cache;
if (ip6_hold_safe(net, &rt, true))
dst_use_noref(&rt->dst, jiffies);
} else if (dst_hold_safe(&rt->dst)) {
struct rt6_info *nrt;
if (ip6_hold_safe(net, &rt, true))
dst_use_noref(&rt->dst, jiffies);
nrt = ip6_create_rt_rcu(rt);
dst_release(&rt->dst);
rt = nrt;
} else {
rt = net->ipv6.ip6_null_entry;
dst_hold(&rt->dst);
}
rcu_read_unlock();
trace_fib6_table_lookup(net, rt, table, fl6);
return rt;
}
struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,