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// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/cfm_bridge.h>
#include <uapi/linux/cfm_bridge.h>
#include "br_private_cfm.h"
static struct br_cfm_mep *br_mep_find(struct net_bridge *br, u32 instance)
{
struct br_cfm_mep *mep;
hlist_for_each_entry(mep, &br->mep_list, head)
if (mep->instance == instance)
return mep;
return NULL;
}
static struct br_cfm_mep *br_mep_find_ifindex(struct net_bridge *br,
u32 ifindex)
{
struct br_cfm_mep *mep;
hlist_for_each_entry_rcu(mep, &br->mep_list, head,
lockdep_rtnl_is_held())
if (mep->create.ifindex == ifindex)
return mep;
return NULL;
}
static struct br_cfm_peer_mep *br_peer_mep_find(struct br_cfm_mep *mep,
u32 mepid)
{
struct br_cfm_peer_mep *peer_mep;
hlist_for_each_entry_rcu(peer_mep, &mep->peer_mep_list, head,
lockdep_rtnl_is_held())
if (peer_mep->mepid == mepid)
return peer_mep;
return NULL;
}
static struct net_bridge_port *br_mep_get_port(struct net_bridge *br,
u32 ifindex)
{
struct net_bridge_port *port;
list_for_each_entry(port, &br->port_list, list)
if (port->dev->ifindex == ifindex)
return port;
return NULL;
}
int br_cfm_mep_create(struct net_bridge *br,
const u32 instance,
struct br_cfm_mep_create *const create,
struct netlink_ext_ack *extack)
{
struct net_bridge_port *p;
struct br_cfm_mep *mep;
ASSERT_RTNL();
if (create->domain == BR_CFM_VLAN) {
NL_SET_ERR_MSG_MOD(extack,
"VLAN domain not supported");
return -EINVAL;
}
if (create->domain != BR_CFM_PORT) {
NL_SET_ERR_MSG_MOD(extack,
"Invalid domain value");
return -EINVAL;
}
if (create->direction == BR_CFM_MEP_DIRECTION_UP) {
NL_SET_ERR_MSG_MOD(extack,
"Up-MEP not supported");
return -EINVAL;
}
if (create->direction != BR_CFM_MEP_DIRECTION_DOWN) {
NL_SET_ERR_MSG_MOD(extack,
"Invalid direction value");
return -EINVAL;
}
p = br_mep_get_port(br, create->ifindex);
if (!p) {
NL_SET_ERR_MSG_MOD(extack,
"Port is not related to bridge");
return -EINVAL;
}
mep = br_mep_find(br, instance);
if (mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance already exists");
return -EEXIST;
}
/* In PORT domain only one instance can be created per port */
if (create->domain == BR_CFM_PORT) {
mep = br_mep_find_ifindex(br, create->ifindex);
if (mep) {
NL_SET_ERR_MSG_MOD(extack,
"Only one Port MEP on a port allowed");
return -EINVAL;
}
}
mep = kzalloc(sizeof(*mep), GFP_KERNEL);
if (!mep)
return -ENOMEM;
mep->create = *create;
mep->instance = instance;
rcu_assign_pointer(mep->b_port, p);
INIT_HLIST_HEAD(&mep->peer_mep_list);
hlist_add_tail_rcu(&mep->head, &br->mep_list);
return 0;
}
static void mep_delete_implementation(struct net_bridge *br,
struct br_cfm_mep *mep)
{
struct br_cfm_peer_mep *peer_mep;
struct hlist_node *n_store;
ASSERT_RTNL();
/* Empty and free peer MEP list */
hlist_for_each_entry_safe(peer_mep, n_store, &mep->peer_mep_list, head) {
hlist_del_rcu(&peer_mep->head);
kfree_rcu(peer_mep, rcu);
}
RCU_INIT_POINTER(mep->b_port, NULL);
hlist_del_rcu(&mep->head);
kfree_rcu(mep, rcu);
}
int br_cfm_mep_delete(struct net_bridge *br,
const u32 instance,
struct netlink_ext_ack *extack)
{
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
mep_delete_implementation(br, mep);
return 0;
}
int br_cfm_mep_config_set(struct net_bridge *br,
const u32 instance,
const struct br_cfm_mep_config *const config,
struct netlink_ext_ack *extack)
{
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
mep->config = *config;
return 0;
}
int br_cfm_cc_peer_mep_add(struct net_bridge *br, const u32 instance,
u32 mepid,
struct netlink_ext_ack *extack)
{
struct br_cfm_peer_mep *peer_mep;
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
peer_mep = br_peer_mep_find(mep, mepid);
if (peer_mep) {
NL_SET_ERR_MSG_MOD(extack,
"Peer MEP-ID already exists");
return -EEXIST;
}
peer_mep = kzalloc(sizeof(*peer_mep), GFP_KERNEL);
if (!peer_mep)
return -ENOMEM;
peer_mep->mepid = mepid;
peer_mep->mep = mep;
hlist_add_tail_rcu(&peer_mep->head, &mep->peer_mep_list);
return 0;
}
int br_cfm_cc_peer_mep_remove(struct net_bridge *br, const u32 instance,
u32 mepid,
struct netlink_ext_ack *extack)
{
struct br_cfm_peer_mep *peer_mep;
struct br_cfm_mep *mep;
ASSERT_RTNL();
mep = br_mep_find(br, instance);
if (!mep) {
NL_SET_ERR_MSG_MOD(extack,
"MEP instance does not exists");
return -ENOENT;
}
peer_mep = br_peer_mep_find(mep, mepid);
if (!peer_mep) {
NL_SET_ERR_MSG_MOD(extack,
"Peer MEP-ID does not exists");
return -ENOENT;
}
hlist_del_rcu(&peer_mep->head);
kfree_rcu(peer_mep, rcu);
return 0;
}
/* Deletes the CFM instances on a specific bridge port
*/
void br_cfm_port_del(struct net_bridge *br, struct net_bridge_port *port)
{
struct hlist_node *n_store;
struct br_cfm_mep *mep;
ASSERT_RTNL();
hlist_for_each_entry_safe(mep, n_store, &br->mep_list, head)
if (mep->create.ifindex == port->dev->ifindex)
mep_delete_implementation(br, mep);
}
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