1 // SPDX-License-Identifier: GPL-2.0-only
3 * VLAN netlink control interface
5 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
8 #include <linux/kernel.h>
9 #include <linux/netdevice.h>
10 #include <linux/if_vlan.h>
11 #include <linux/module.h>
12 #include <net/net_namespace.h>
13 #include <net/netlink.h>
14 #include <net/rtnetlink.h>
18 static const struct nla_policy vlan_policy
[IFLA_VLAN_MAX
+ 1] = {
19 [IFLA_VLAN_ID
] = { .type
= NLA_U16
},
20 [IFLA_VLAN_FLAGS
] = { .len
= sizeof(struct ifla_vlan_flags
) },
21 [IFLA_VLAN_EGRESS_QOS
] = { .type
= NLA_NESTED
},
22 [IFLA_VLAN_INGRESS_QOS
] = { .type
= NLA_NESTED
},
23 [IFLA_VLAN_PROTOCOL
] = { .type
= NLA_U16
},
26 static const struct nla_policy vlan_map_policy
[IFLA_VLAN_QOS_MAX
+ 1] = {
27 [IFLA_VLAN_QOS_MAPPING
] = { .len
= sizeof(struct ifla_vlan_qos_mapping
) },
31 static inline int vlan_validate_qos_map(struct nlattr
*attr
)
35 return nla_validate_nested_deprecated(attr
, IFLA_VLAN_QOS_MAX
,
36 vlan_map_policy
, NULL
);
39 static int vlan_validate(struct nlattr
*tb
[], struct nlattr
*data
[],
40 struct netlink_ext_ack
*extack
)
42 struct ifla_vlan_flags
*flags
;
46 if (tb
[IFLA_ADDRESS
]) {
47 if (nla_len(tb
[IFLA_ADDRESS
]) != ETH_ALEN
) {
48 NL_SET_ERR_MSG_MOD(extack
, "Invalid link address");
51 if (!is_valid_ether_addr(nla_data(tb
[IFLA_ADDRESS
]))) {
52 NL_SET_ERR_MSG_MOD(extack
, "Invalid link address");
53 return -EADDRNOTAVAIL
;
58 NL_SET_ERR_MSG_MOD(extack
, "VLAN properties not specified");
62 if (data
[IFLA_VLAN_PROTOCOL
]) {
63 switch (nla_get_be16(data
[IFLA_VLAN_PROTOCOL
])) {
64 case htons(ETH_P_8021Q
):
65 case htons(ETH_P_8021AD
):
68 NL_SET_ERR_MSG_MOD(extack
, "Invalid VLAN protocol");
69 return -EPROTONOSUPPORT
;
73 if (data
[IFLA_VLAN_ID
]) {
74 id
= nla_get_u16(data
[IFLA_VLAN_ID
]);
75 if (id
>= VLAN_VID_MASK
) {
76 NL_SET_ERR_MSG_MOD(extack
, "Invalid VLAN id");
80 if (data
[IFLA_VLAN_FLAGS
]) {
81 flags
= nla_data(data
[IFLA_VLAN_FLAGS
]);
82 if ((flags
->flags
& flags
->mask
) &
83 ~(VLAN_FLAG_REORDER_HDR
| VLAN_FLAG_GVRP
|
84 VLAN_FLAG_LOOSE_BINDING
| VLAN_FLAG_MVRP
|
85 VLAN_FLAG_BRIDGE_BINDING
)) {
86 NL_SET_ERR_MSG_MOD(extack
, "Invalid VLAN flags");
91 err
= vlan_validate_qos_map(data
[IFLA_VLAN_INGRESS_QOS
]);
93 NL_SET_ERR_MSG_MOD(extack
, "Invalid ingress QOS map");
96 err
= vlan_validate_qos_map(data
[IFLA_VLAN_EGRESS_QOS
]);
98 NL_SET_ERR_MSG_MOD(extack
, "Invalid egress QOS map");
104 static int vlan_changelink(struct net_device
*dev
, struct nlattr
*tb
[],
105 struct nlattr
*data
[],
106 struct netlink_ext_ack
*extack
)
108 struct ifla_vlan_flags
*flags
;
109 struct ifla_vlan_qos_mapping
*m
;
113 if (data
[IFLA_VLAN_FLAGS
]) {
114 flags
= nla_data(data
[IFLA_VLAN_FLAGS
]);
115 vlan_dev_change_flags(dev
, flags
->flags
, flags
->mask
);
117 if (data
[IFLA_VLAN_INGRESS_QOS
]) {
118 nla_for_each_nested(attr
, data
[IFLA_VLAN_INGRESS_QOS
], rem
) {
120 vlan_dev_set_ingress_priority(dev
, m
->to
, m
->from
);
123 if (data
[IFLA_VLAN_EGRESS_QOS
]) {
124 nla_for_each_nested(attr
, data
[IFLA_VLAN_EGRESS_QOS
], rem
) {
126 vlan_dev_set_egress_priority(dev
, m
->from
, m
->to
);
132 static int vlan_newlink(struct net
*src_net
, struct net_device
*dev
,
133 struct nlattr
*tb
[], struct nlattr
*data
[],
134 struct netlink_ext_ack
*extack
)
136 struct vlan_dev_priv
*vlan
= vlan_dev_priv(dev
);
137 struct net_device
*real_dev
;
138 unsigned int max_mtu
;
142 if (!data
[IFLA_VLAN_ID
]) {
143 NL_SET_ERR_MSG_MOD(extack
, "VLAN id not specified");
147 if (!tb
[IFLA_LINK
]) {
148 NL_SET_ERR_MSG_MOD(extack
, "link not specified");
152 real_dev
= __dev_get_by_index(src_net
, nla_get_u32(tb
[IFLA_LINK
]));
154 NL_SET_ERR_MSG_MOD(extack
, "link does not exist");
158 if (data
[IFLA_VLAN_PROTOCOL
])
159 proto
= nla_get_be16(data
[IFLA_VLAN_PROTOCOL
]);
161 proto
= htons(ETH_P_8021Q
);
163 vlan
->vlan_proto
= proto
;
164 vlan
->vlan_id
= nla_get_u16(data
[IFLA_VLAN_ID
]);
165 vlan
->real_dev
= real_dev
;
166 dev
->priv_flags
|= (real_dev
->priv_flags
& IFF_XMIT_DST_RELEASE
);
167 vlan
->flags
= VLAN_FLAG_REORDER_HDR
;
169 err
= vlan_check_real_dev(real_dev
, vlan
->vlan_proto
, vlan
->vlan_id
,
174 max_mtu
= netif_reduces_vlan_mtu(real_dev
) ? real_dev
->mtu
- VLAN_HLEN
:
178 else if (dev
->mtu
> max_mtu
)
181 err
= vlan_changelink(dev
, tb
, data
, extack
);
185 return register_vlan_dev(dev
, extack
);
188 static inline size_t vlan_qos_map_size(unsigned int n
)
192 /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
193 return nla_total_size(sizeof(struct nlattr
)) +
194 nla_total_size(sizeof(struct ifla_vlan_qos_mapping
)) * n
;
197 static size_t vlan_get_size(const struct net_device
*dev
)
199 struct vlan_dev_priv
*vlan
= vlan_dev_priv(dev
);
201 return nla_total_size(2) + /* IFLA_VLAN_PROTOCOL */
202 nla_total_size(2) + /* IFLA_VLAN_ID */
203 nla_total_size(sizeof(struct ifla_vlan_flags
)) + /* IFLA_VLAN_FLAGS */
204 vlan_qos_map_size(vlan
->nr_ingress_mappings
) +
205 vlan_qos_map_size(vlan
->nr_egress_mappings
);
208 static int vlan_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
210 struct vlan_dev_priv
*vlan
= vlan_dev_priv(dev
);
211 struct vlan_priority_tci_mapping
*pm
;
212 struct ifla_vlan_flags f
;
213 struct ifla_vlan_qos_mapping m
;
217 if (nla_put_be16(skb
, IFLA_VLAN_PROTOCOL
, vlan
->vlan_proto
) ||
218 nla_put_u16(skb
, IFLA_VLAN_ID
, vlan
->vlan_id
))
219 goto nla_put_failure
;
221 f
.flags
= vlan
->flags
;
223 if (nla_put(skb
, IFLA_VLAN_FLAGS
, sizeof(f
), &f
))
224 goto nla_put_failure
;
226 if (vlan
->nr_ingress_mappings
) {
227 nest
= nla_nest_start_noflag(skb
, IFLA_VLAN_INGRESS_QOS
);
229 goto nla_put_failure
;
231 for (i
= 0; i
< ARRAY_SIZE(vlan
->ingress_priority_map
); i
++) {
232 if (!vlan
->ingress_priority_map
[i
])
236 m
.to
= vlan
->ingress_priority_map
[i
];
237 if (nla_put(skb
, IFLA_VLAN_QOS_MAPPING
,
239 goto nla_put_failure
;
241 nla_nest_end(skb
, nest
);
244 if (vlan
->nr_egress_mappings
) {
245 nest
= nla_nest_start_noflag(skb
, IFLA_VLAN_EGRESS_QOS
);
247 goto nla_put_failure
;
249 for (i
= 0; i
< ARRAY_SIZE(vlan
->egress_priority_map
); i
++) {
250 for (pm
= vlan
->egress_priority_map
[i
]; pm
;
255 m
.from
= pm
->priority
;
256 m
.to
= (pm
->vlan_qos
>> 13) & 0x7;
257 if (nla_put(skb
, IFLA_VLAN_QOS_MAPPING
,
259 goto nla_put_failure
;
262 nla_nest_end(skb
, nest
);
270 static struct net
*vlan_get_link_net(const struct net_device
*dev
)
272 struct net_device
*real_dev
= vlan_dev_priv(dev
)->real_dev
;
274 return dev_net(real_dev
);
277 struct rtnl_link_ops vlan_link_ops __read_mostly
= {
279 .maxtype
= IFLA_VLAN_MAX
,
280 .policy
= vlan_policy
,
281 .priv_size
= sizeof(struct vlan_dev_priv
),
283 .validate
= vlan_validate
,
284 .newlink
= vlan_newlink
,
285 .changelink
= vlan_changelink
,
286 .dellink
= unregister_vlan_dev
,
287 .get_size
= vlan_get_size
,
288 .fill_info
= vlan_fill_info
,
289 .get_link_net
= vlan_get_link_net
,
292 int __init
vlan_netlink_init(void)
294 return rtnl_link_register(&vlan_link_ops
);
297 void __exit
vlan_netlink_fini(void)
299 rtnl_link_unregister(&vlan_link_ops
);
302 MODULE_ALIAS_RTNL_LINK("vlan");