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net: vrf: Flip IPv6 output path from FIB lookup hook to out hook

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Flip the IPv6 output path to use the l3mdev tx out hook. The VRF dst
is not returned on the first FIB lookup. Instead, the dst on the
skb is switched at the beginning of the IPv6 output processing to
send the packet to the VRF driver on xmit.

Link scope addresses (linklocal and multicast) need special handling:
specifically the oif the flow struct can not be changed because we
want the lookup tied to the enslaved interface. ie., the source address
and the returned route MUST point to the interface scope passed in.
Convert the existing vrf_get_rt6_dst to handle only link scope addresses.

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 12:09:56 -07:00 • committed by David S. Miller
commit 4c1feac58e
4 changed files with 100 additions and 58 deletions
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15
net/l3mdev/l3mdev.c
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@ -100,15 +100,14 @@ u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
/**
* l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns
* cached route for L3 master device if relevant
* to flow
* l3mdev_link_scope_lookup - IPv6 route lookup based on flow for link
* local and multicast addresses
* @net: network namespace for device index lookup
* @fl6: IPv6 flow struct for lookup
*/
struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
struct flowi6 *fl6)
struct dst_entry *l3mdev_link_scope_lookup(struct net *net,
struct flowi6 *fl6)
{
struct dst_entry *dst = NULL;
struct net_device *dev;
@ -121,15 +120,15 @@ struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
dev = netdev_master_upper_dev_get_rcu(dev);
if (dev && netif_is_l3_master(dev) &&
dev->l3mdev_ops->l3mdev_get_rt6_dst)
dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
dev->l3mdev_ops->l3mdev_link_scope_lookup)
dst = dev->l3mdev_ops->l3mdev_link_scope_lookup(dev, fl6);
rcu_read_unlock();
}
return dst;
}
EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst);
EXPORT_SYMBOL_GPL(l3mdev_link_scope_lookup);
/**
* l3mdev_get_saddr - get source address for a flow based on an interface