vxlan: Have vxlan_fdb_replace() save original rdst value
To enable rollbacks after vetoed FDB updates, extend vxlan_fdb_replace()
to take an additional argument where it should store the original values
of a modified rdst. Update the sole caller.
The following patch will make use of the saved value.
Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index aeaa429..1c8d8c8 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -625,7 +625,7 @@
/* Replace destination of unicast mac */
static int vxlan_fdb_replace(struct vxlan_fdb *f,
union vxlan_addr *ip, __be16 port, __be32 vni,
- __u32 ifindex)
+ __u32 ifindex, struct vxlan_rdst *oldrd)
{
struct vxlan_rdst *rd;
@@ -637,6 +637,7 @@
if (!rd)
return 0;
+ *oldrd = *rd;
dst_cache_reset(&rd->dst_cache);
rd->remote_ip = *ip;
rd->remote_port = port;
@@ -865,6 +866,7 @@
{
__u16 fdb_flags = (ndm_flags & ~NTF_USE);
struct vxlan_rdst *rd = NULL;
+ struct vxlan_rdst oldrd;
int notify = 0;
int rc;
@@ -890,7 +892,7 @@
if (!(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
rc = vxlan_fdb_replace(f, ip, port, vni,
- ifindex);
+ ifindex, &oldrd);
notify |= rc;
} else {
return -EOPNOTSUPP;