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// SPDX-License-Identifier: GPL-2.0-only
/*
* VLAN netlink control interface
*
* Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
*/
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/module.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
#include <net/rtnetlink.h>
#include "vlan.h"
static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
[IFLA_VLAN_ID] = { .type = NLA_U16 },
[IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
[IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
[IFLA_VLAN_PROTOCOL] = { .type = NLA_U16 },
};
static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
};
static inline int vlan_validate_qos_map(struct nlattr *attr)
{
if (!attr)
return 0;
return nla_validate_nested_deprecated(attr, IFLA_VLAN_QOS_MAX,
vlan_map_policy, NULL);
}
static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct ifla_vlan_flags *flags;
u16 id;
int err;
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
return -EINVAL;
}
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
return -EADDRNOTAVAIL;
}
}
if (!data) {
NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
return -EINVAL;
}
if (data[IFLA_VLAN_PROTOCOL]) {
switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
case htons(ETH_P_8021Q):
case htons(ETH_P_8021AD):
break;
default:
NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
return -EPROTONOSUPPORT;
}
}
if (data[IFLA_VLAN_ID]) {
id = nla_get_u16(data[IFLA_VLAN_ID]);
if (id >= VLAN_VID_MASK) {
NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id");
return -ERANGE;
}
}
if (data[IFLA_VLAN_FLAGS]) {
flags = nla_data(data[IFLA_VLAN_FLAGS]);
if ((flags->flags & flags->mask) &
~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP |
VLAN_FLAG_BRIDGE_BINDING)) {
NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
return -EINVAL;
}
}
err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
if (err < 0) {
NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
return err;
}
err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
if (err < 0) {
NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
return err;
}
return 0;
}
static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct ifla_vlan_flags *flags;
struct ifla_vlan_qos_mapping *m;
struct nlattr *attr;
int rem, err;
if (data[IFLA_VLAN_FLAGS]) {
flags = nla_data(data[IFLA_VLAN_FLAGS]);
err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
if (err)
return err;
}
if (data[IFLA_VLAN_INGRESS_QOS]) {
nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
continue;
m = nla_data(attr);
vlan_dev_set_ingress_priority(dev, m->to, m->from);
}
}
if (data[IFLA_VLAN_EGRESS_QOS]) {
nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
continue;
m = nla_data(attr);
err = vlan_dev_set_egress_priority(dev, m->from, m->to);
if (err)
return err;
}
}
return 0;
}
static int vlan_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct net_device *real_dev;
unsigned int max_mtu;
__be16 proto;
int err;
if (!data[IFLA_VLAN_ID]) {
NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
return -EINVAL;
}
if (!tb[IFLA_LINK]) {
NL_SET_ERR_MSG_MOD(extack, "link not specified");
return -EINVAL;
}
real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
if (!real_dev) {
NL_SET_ERR_MSG_MOD(extack, "link does not exist");
return -ENODEV;
}
if (data[IFLA_VLAN_PROTOCOL])
proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
else
proto = htons(ETH_P_8021Q);
vlan->vlan_proto = proto;
vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
vlan->real_dev = real_dev;
dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
vlan->flags = VLAN_FLAG_REORDER_HDR;
err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
extack);
if (err < 0)
return err;
max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
real_dev->mtu;
if (!tb[IFLA_MTU])
dev->mtu = max_mtu;
else if (dev->mtu > max_mtu)
return -EINVAL;
/* Note: If this initial vlan_changelink() fails, we need
* to call vlan_dev_free_egress_priority() to free memory.
*/
err = vlan_changelink(dev, tb, data, extack);
if (!err)
err = register_vlan_dev(dev, extack);
if (err)
vlan_dev_free_egress_priority(dev);
return err;
}
static inline size_t vlan_qos_map_size(unsigned int n)
{
if (n == 0)
return 0;
/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
return nla_total_size(sizeof(struct nlattr)) +
nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
}
static size_t vlan_get_size(const struct net_device *dev)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
nla_total_size(2) + /* IFLA_VLAN_ID */
nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
vlan_qos_map_size(vlan->nr_ingress_mappings) +
vlan_qos_map_size(vlan->nr_egress_mappings);
}
static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct vlan_priority_tci_mapping *pm;
struct ifla_vlan_flags f;
struct ifla_vlan_qos_mapping m;
struct nlattr *nest;
unsigned int i;
if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
goto nla_put_failure;
if (vlan->flags) {
f.flags = vlan->flags;
f.mask = ~0;
if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
goto nla_put_failure;
}
if (vlan->nr_ingress_mappings) {
nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
if (nest == NULL)
goto nla_put_failure;
for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
if (!vlan->ingress_priority_map[i])
continue;
m.from = i;
m.to = vlan->ingress_priority_map[i];
if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
sizeof(m), &m))
goto nla_put_failure;
}
nla_nest_end(skb, nest);
}
if (vlan->nr_egress_mappings) {
nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
if (nest == NULL)
goto nla_put_failure;
for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
for (pm = vlan->egress_priority_map[i]; pm;
pm = pm->next) {
if (!pm->vlan_qos)
continue;
m.from = pm->priority;
m.to = (pm->vlan_qos >> 13) & 0x7;
if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
sizeof(m), &m))
goto nla_put_failure;
}
}
nla_nest_end(skb, nest);
}
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct net *vlan_get_link_net(const struct net_device *dev)
{
struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
return dev_net(real_dev);
}
struct rtnl_link_ops vlan_link_ops __read_mostly = {
.kind = "vlan",
.maxtype = IFLA_VLAN_MAX,
.policy = vlan_policy,
.priv_size = sizeof(struct vlan_dev_priv),
.setup = vlan_setup,
.validate = vlan_validate,
.newlink = vlan_newlink,
.changelink = vlan_changelink,
.dellink = unregister_vlan_dev,
.get_size = vlan_get_size,
.fill_info = vlan_fill_info,
.get_link_net = vlan_get_link_net,
};
int __init vlan_netlink_init(void)
{
return rtnl_link_register(&vlan_link_ops);
}
void __exit vlan_netlink_fini(void)
{
rtnl_link_unregister(&vlan_link_ops);
}
MODULE_ALIAS_RTNL_LINK("vlan");
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