diff options
| author | David Ahern <dsa@cumulusnetworks.com> | 2016-09-10 22:09:54 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-09-11 09:12:52 +0300 |
| commit | 5f02ce24c2696fec33f2a5dfcf753996f5fdd211 (patch) | |
| tree | 123e0a2518f4a18e5d0b59c6e3442c5f355b23f5 | |
| parent | a8e3e1a9f02094145580ea7920c6a1d9aabd5539 (diff) | |
| download | linux-5f02ce24c2696fec33f2a5dfcf753996f5fdd211.tar.xz | |
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>
| -rw-r--r-- | include/net/l3mdev.h | 6 | ||||
| -rw-r--r-- | net/ipv4/route.c | 8 | ||||
| -rw-r--r-- | net/ipv6/route.c | 12 |
3 files changed, 19 insertions, 7 deletions
diff --git a/include/net/l3mdev.h b/include/net/l3mdev.h index 53d5274920e3..3ee110518584 100644 --- a/include/net/l3mdev.h +++ b/include/net/l3mdev.h @@ -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; } diff --git a/net/ipv4/route.c b/net/ipv4/route.c index 3e992783c1d0..f49b2c534e92 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -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; diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 09d43ff11a8d..2c681113c055 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -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); |