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net: l3mdev: Allow the l3mdev to be a loopback 

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 <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2016-09-10 12:09:54 -07:00 committed by David S. Miller
parent a8e3e1a9f0
commit 5f02ce24c2
3 changed files with 19 additions and 7 deletions
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6
include/net/l3mdev.h
View File

@ -90,7 +90,7 @@ static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
}
static inline
const struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
{
/* netdev_master_upper_dev_get_rcu calls
* list_first_or_null_rcu to walk the upper dev list.
@ -99,7 +99,7 @@ const struct net_device *l3mdev_master_dev_rcu(const struct net_device *_dev)
* typecast to remove the const
*/
struct net_device *dev = (struct net_device *)_dev;
const struct net_device *master;
struct net_device *master;
if (!dev)
return NULL;
@ -254,7 +254,7 @@ static inline int l3mdev_master_ifindex_by_index(struct net *net, int ifindex)
}
static inline
const struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
struct net_device *l3mdev_master_dev_rcu(const struct net_device *dev)
{
return NULL;
}

8
net/ipv4/route.c
View File

@ -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;

12
net/ipv6/route.c
View File

@ -2558,8 +2558,16 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
{
u32 tb_id;
struct net *net = dev_net(idev->dev);
struct rt6_info *rt = ip6_dst_alloc(net, net->loopback_dev,
DST_NOCOUNT);
struct net_device *dev = net->loopback_dev;
struct rt6_info *rt;
/* use L3 Master device as loopback for host routes if device
* is enslaved and address is not link local or multicast
*/
if (!rt6_need_strict(addr))
dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
if (!rt)
return ERR_PTR(-ENOMEM);