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net: l3mdev: Allow the l3mdev to be a loopback

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Allow an L3 master device to act as the loopback for that L3 domain.
For IPv4 the device can also have the address 127.0.0.1.

Signed-off-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
David Ahern 2016-09-10 12:09:54 -07:00 • committed by David S. Miller
commit 5f02ce24c2
3 changed files with 19 additions and 7 deletions
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8
net/ipv4/route.c
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@ -2018,7 +2018,9 @@ static struct rtable *__mkroute_output(const struct fib_result *res,
return ERR_PTR(-EINVAL);
if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev)))
if (ipv4_is_loopback(fl4->saddr) && !(dev_out->flags & IFF_LOOPBACK))
if (ipv4_is_loopback(fl4->saddr) &&
!(dev_out->flags & IFF_LOOPBACK) &&
!netif_is_l3_master(dev_out))
return ERR_PTR(-EINVAL);
if (ipv4_is_lbcast(fl4->daddr))
@ -2302,7 +2304,9 @@ struct rtable *__ip_route_output_key_hash(struct net *net, struct flowi4 *fl4,
else
fl4->saddr = fl4->daddr;
}
dev_out = net->loopback_dev;
/* L3 master device is the loopback for that domain */
dev_out = l3mdev_master_dev_rcu(dev_out) ? : net->loopback_dev;
fl4->flowi4_oif = dev_out->ifindex;
flags |= RTCF_LOCAL;
goto make_route;