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ipv6: Refactor __ip6_route_redirect 

Move the nexthop evaluation of a fib entry to a helper that can be
leveraged for each fib6_nh in a multipath nexthop object.

In the move, 'continue' statements means the helper returns false
(loop should continue) and 'break' means return true (found the entry
of interest).

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-09 14:41:19 -07:00 committed by David S. Miller
parent 0c59d00675
commit 0b34eb0043
1 changed files with 33 additions and 23 deletions
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56
net/ipv6/route.c
View File

@ -2407,6 +2407,35 @@ void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
NULL);
}
static bool ip6_redirect_nh_match(struct fib6_info *f6i,
struct fib6_nh *nh,
struct flowi6 *fl6,
const struct in6_addr *gw,
struct rt6_info **ret)
{
if (nh->fib_nh_flags & RTNH_F_DEAD || !nh->fib_nh_gw_family ||
fl6->flowi6_oif != nh->fib_nh_dev->ifindex)
return false;
/* rt_cache's gateway might be different from its 'parent'
* in the case of an ip redirect.
* So we keep searching in the exception table if the gateway
* is different.
*/
if (!ipv6_addr_equal(gw, &nh->fib_nh_gw6)) {
struct rt6_info *rt_cache;
rt_cache = rt6_find_cached_rt(f6i, &fl6->daddr, &fl6->saddr);
if (rt_cache &&
ipv6_addr_equal(gw, &rt_cache->rt6i_gateway)) {
*ret = rt_cache;
return true;
}
return false;
}
return true;
}
/* Handle redirects */
struct ip6rd_flowi {
struct flowi6 fl6;
@ -2420,7 +2449,7 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
int flags)
{
struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
struct rt6_info *ret = NULL, *rt_cache;
struct rt6_info *ret = NULL;
struct fib6_info *rt;
struct fib6_node *fn;
@ -2438,34 +2467,15 @@ static struct rt6_info *__ip6_route_redirect(struct net *net,
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
restart:
for_each_fib6_node_rt_rcu(fn) {
if (rt->fib6_nh.fib_nh_flags & RTNH_F_DEAD)
continue;
if (fib6_check_expired(rt))
continue;
if (rt->fib6_flags & RTF_REJECT)
break;
if (!rt->fib6_nh.fib_nh_gw_family)
continue;
if (fl6->flowi6_oif != rt->fib6_nh.fib_nh_dev->ifindex)
continue;
/* rt_cache's gateway might be different from its 'parent'
* in the case of an ip redirect.
* So we keep searching in the exception table if the gateway
* is different.
*/
if (!ipv6_addr_equal(&rdfl->gateway, &rt->fib6_nh.fib_nh_gw6)) {
rt_cache = rt6_find_cached_rt(rt,
&fl6->daddr,
&fl6->saddr);
if (rt_cache &&
ipv6_addr_equal(&rdfl->gateway,
&rt_cache->rt6i_gateway)) {
ret = rt_cache;
break;
}
continue;
}
break;
if (ip6_redirect_nh_match(rt, &rt->fib6_nh, fl6,
&rdfl->gateway, &ret))
goto out;
}
if (!rt)