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net/ipv6: Move gateway validation into helper

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Move existing code to validate nexthop into a helper. Follow on patch
adds support for nexthops marked with onlink, and this helper keeps
the complexity of ip6_route_info_create in check.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-01-25 16:55:07 -08:00 committed by David S. Miller
parent 9515a2e082
commit 1edce99fa8
1 changed files with 49 additions and 36 deletions
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85
net/ipv6/route.c
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@ -2469,6 +2469,54 @@ static struct rt6_info *ip6_nh_lookup_table(struct net *net,
return rt;
}
static int ip6_route_check_nh(struct net *net,
struct fib6_config *cfg,
struct net_device **_dev,
struct inet6_dev **idev)
{
const struct in6_addr *gw_addr = &cfg->fc_gateway;
struct net_device *dev = _dev ? *_dev : NULL;
struct rt6_info *grt = NULL;
int err = -EHOSTUNREACH;
if (cfg->fc_table) {
grt = ip6_nh_lookup_table(net, cfg, gw_addr);
if (grt) {
if (grt->rt6i_flags & RTF_GATEWAY ||
(dev && dev != grt->dst.dev)) {
ip6_rt_put(grt);
grt = NULL;
}
}
}
if (!grt)
grt = rt6_lookup(net, gw_addr, NULL, cfg->fc_ifindex, 1);
if (!grt)
goto out;
if (dev) {
if (dev != grt->dst.dev) {
ip6_rt_put(grt);
goto out;
}
} else {
*_dev = dev = grt->dst.dev;
*idev = grt->rt6i_idev;
dev_hold(dev);
in6_dev_hold(grt->rt6i_idev);
}
if (!(grt->rt6i_flags & RTF_GATEWAY))
err = 0;
ip6_rt_put(grt);
out:
return err;
}
static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
struct netlink_ext_ack *extack)
{
@ -2664,8 +2712,6 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
rt->rt6i_gateway = *gw_addr;
if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
struct rt6_info *grt = NULL;
/* IPv6 strictly inhibits using not link-local
addresses as nexthop address.
Otherwise, router will not able to send redirects.
@ -2682,40 +2728,7 @@ static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg,
goto out;
}
if (cfg->fc_table) {
grt = ip6_nh_lookup_table(net, cfg, gw_addr);
if (grt) {
if (grt->rt6i_flags & RTF_GATEWAY ||
(dev && dev != grt->dst.dev)) {
ip6_rt_put(grt);
grt = NULL;
}
}
}
if (!grt)
grt = rt6_lookup(net, gw_addr, NULL,
cfg->fc_ifindex, 1);
err = -EHOSTUNREACH;
if (!grt)
goto out;
if (dev) {
if (dev != grt->dst.dev) {
ip6_rt_put(grt);
goto out;
}
} else {
dev = grt->dst.dev;
idev = grt->rt6i_idev;
dev_hold(dev);
in6_dev_hold(grt->rt6i_idev);
}
if (!(grt->rt6i_flags & RTF_GATEWAY))
err = 0;
ip6_rt_put(grt);
err = ip6_route_check_nh(net, cfg, &dev, &idev);
if (err)
goto out;
}