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net: vrf: Implement get_saddr for IPv6

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IPv6 source address selection needs to consider the real egress route.
Similar to IPv4 implement a get_saddr6 method which is called if
source address has not been set.  The get_saddr6 method does a full
lookup which means pulling a route from the VRF FIB table and properly
considering linklocal/multicast destination addresses. Lookup failures
(eg., unreachable) then cause the source address selection to fail
which gets propagated back to the caller.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern
2016-06-16 16:24:25 -07:00
committed by David S. Miller
parent a2e2ff560f
commit 0d240e7811
4 changed files with 86 additions and 2 deletions
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11
include/net/l3mdev.h
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@@ -39,6 +39,9 @@ struct l3mdev_ops {
/* IPv6 ops */
struct dst_entry * (*l3mdev_get_rt6_dst)(const struct net_device *dev,
struct flowi6 *fl6);
int (*l3mdev_get_saddr6)(struct net_device *dev,
const struct sock *sk,
struct flowi6 *fl6);
};
#ifdef CONFIG_NET_L3_MASTER_DEV
@@ -140,6 +143,8 @@ static inline bool netif_index_is_l3_master(struct net *net, int ifindex)
int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4);
struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6);
int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
struct flowi6 *fl6);
static inline
struct sk_buff *l3mdev_l3_rcv(struct sk_buff *skb, u16 proto)
@@ -230,6 +235,12 @@ struct dst_entry *l3mdev_get_rt6_dst(struct net *net, struct flowi6 *fl6)
return NULL;
}
static inline int l3mdev_get_saddr6(struct net *net, const struct sock *sk,
struct flowi6 *fl6)
{
return 0;
}
static inline
struct sk_buff *l3mdev_ip_rcv(struct sk_buff *skb)
{