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vxlan: Split vxlan_fdb_update() in two

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In order to make it easier to implement rollbacks after FDB update
vetoing, separate the FDB update code to two parts: one that deals with
updates of existing FDB entries, and one that creates new entries.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2019-01-16 23:06:32 +00:00 committed by David S. Miller
parent c2b200e0ba
commit a76d1ca296
1 changed files with 97 additions and 61 deletions
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158
drivers/net/vxlan.c
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@ -855,6 +855,97 @@ static void vxlan_fdb_destroy(struct vxlan_dev *vxlan, struct vxlan_fdb *f,
call_rcu(&f->rcu, vxlan_fdb_free);
}
static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
union vxlan_addr *ip,
__u16 state, __u16 flags,
__be16 port, __be32 vni,
__u32 ifindex, __u16 ndm_flags,
struct vxlan_fdb *f,
bool swdev_notify)
{
__u16 fdb_flags = (ndm_flags & ~NTF_USE);
struct vxlan_rdst *rd = NULL;
int notify = 0;
int rc;
/* Do not allow an externally learned entry to take over an entry added
* by the user.
*/
if (!(fdb_flags & NTF_EXT_LEARNED) ||
!(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
if (f->state != state) {
f->state = state;
f->updated = jiffies;
notify = 1;
}
if (f->flags != fdb_flags) {
f->flags = fdb_flags;
f->updated = jiffies;
notify = 1;
}
}
if ((flags & NLM_F_REPLACE)) {
/* Only change unicasts */
if (!(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
rc = vxlan_fdb_replace(f, ip, port, vni,
ifindex);
notify |= rc;
} else {
return -EOPNOTSUPP;
}
}
if ((flags & NLM_F_APPEND) &&
(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
if (rc < 0)
return rc;
notify |= rc;
}
if (ndm_flags & NTF_USE)
f->used = jiffies;
if (notify) {
if (rd == NULL)
rd = first_remote_rtnl(f);
vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, swdev_notify);
}
return 0;
}
static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
const u8 *mac, union vxlan_addr *ip,
__u16 state, __u16 flags,
__be16 port, __be32 src_vni, __be32 vni,
__u32 ifindex, __u16 ndm_flags,
bool swdev_notify)
{
__u16 fdb_flags = (ndm_flags & ~NTF_USE);
struct vxlan_fdb *f;
int rc;
/* Disallow replace to add a multicast entry */
if ((flags & NLM_F_REPLACE) &&
(is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
return -EOPNOTSUPP;
netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
vni, ifindex, fdb_flags, &f);
if (rc < 0)
return rc;
vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
swdev_notify);
return 0;
}
/* Add new entry to forwarding table -- assumes lock held */
static int vxlan_fdb_update(struct vxlan_dev *vxlan,
const u8 *mac, union vxlan_addr *ip,
@ -863,11 +954,7 @@ static int vxlan_fdb_update(struct vxlan_dev *vxlan,
__u32 ifindex, __u16 ndm_flags,
bool swdev_notify)
{
__u16 fdb_flags = (ndm_flags & ~NTF_USE);
struct vxlan_rdst *rd = NULL;
struct vxlan_fdb *f;
int notify = 0;
int rc;
f = __vxlan_find_mac(vxlan, mac, src_vni);
if (f) {
@ -877,68 +964,17 @@ static int vxlan_fdb_update(struct vxlan_dev *vxlan,
return -EEXIST;
}
/* Do not allow an externally learned entry to take over an
* entry added by the user.
*/
if (!(fdb_flags & NTF_EXT_LEARNED) ||
!(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
if (f->state != state) {
f->state = state;
f->updated = jiffies;
notify = 1;
}
if (f->flags != fdb_flags) {
f->flags = fdb_flags;
f->updated = jiffies;
notify = 1;
}
}
if ((flags & NLM_F_REPLACE)) {
/* Only change unicasts */
if (!(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
notify |= vxlan_fdb_replace(f, ip, port, vni,
ifindex);
} else
return -EOPNOTSUPP;
}
if ((flags & NLM_F_APPEND) &&
(is_multicast_ether_addr(f->eth_addr) ||
is_zero_ether_addr(f->eth_addr))) {
rc = vxlan_fdb_append(f, ip, port, vni, ifindex, &rd);
if (rc < 0)
return rc;
notify |= rc;
}
if (ndm_flags & NTF_USE)
f->used = jiffies;
return vxlan_fdb_update_existing(vxlan, ip, state, flags, port,
vni, ifindex, ndm_flags, f,
swdev_notify);
} else {
if (!(flags & NLM_F_CREATE))
return -ENOENT;
/* Disallow replace to add a multicast entry */
if ((flags & NLM_F_REPLACE) &&
(is_multicast_ether_addr(mac) || is_zero_ether_addr(mac)))
return -EOPNOTSUPP;
netdev_dbg(vxlan->dev, "add %pM -> %pIS\n", mac, ip);
rc = vxlan_fdb_create(vxlan, mac, ip, state, port, src_vni,
vni, ifindex, fdb_flags, &f);
if (rc < 0)
return rc;
notify = 1;
return vxlan_fdb_update_create(vxlan, mac, ip, state, flags,
port, src_vni, vni, ifindex,
ndm_flags, swdev_notify);
}
if (notify) {
if (rd == NULL)
rd = first_remote_rtnl(f);
vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, swdev_notify);
}
return 0;
}
static void vxlan_dst_free(struct rcu_head *head)