1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * VLAN netlink control interface |
4 | * |
5 | * Copyright (c) 2007 Patrick McHardy <kaber@trash.net> |
6 | */ |
7 | |
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> |
15 | #include "vlan.h" |
16 | |
17 | |
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 }, |
24 | }; |
25 | |
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) }, |
28 | }; |
29 | |
30 | |
31 | static inline int vlan_validate_qos_map(struct nlattr *attr) |
32 | { |
33 | if (!attr) |
34 | return 0; |
35 | return nla_validate_nested_deprecated(start: attr, IFLA_VLAN_QOS_MAX, |
36 | policy: vlan_map_policy, NULL); |
37 | } |
38 | |
39 | static int vlan_validate(struct nlattr *tb[], struct nlattr *data[], |
40 | struct netlink_ext_ack *extack) |
41 | { |
42 | struct ifla_vlan_flags *flags; |
43 | u16 id; |
44 | int err; |
45 | |
46 | if (tb[IFLA_ADDRESS]) { |
47 | if (nla_len(nla: tb[IFLA_ADDRESS]) != ETH_ALEN) { |
48 | NL_SET_ERR_MSG_MOD(extack, "Invalid link address" ); |
49 | return -EINVAL; |
50 | } |
51 | if (!is_valid_ether_addr(addr: nla_data(nla: tb[IFLA_ADDRESS]))) { |
52 | NL_SET_ERR_MSG_MOD(extack, "Invalid link address" ); |
53 | return -EADDRNOTAVAIL; |
54 | } |
55 | } |
56 | |
57 | if (!data) { |
58 | NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified" ); |
59 | return -EINVAL; |
60 | } |
61 | |
62 | if (data[IFLA_VLAN_PROTOCOL]) { |
63 | switch (nla_get_be16(nla: data[IFLA_VLAN_PROTOCOL])) { |
64 | case htons(ETH_P_8021Q): |
65 | case htons(ETH_P_8021AD): |
66 | break; |
67 | default: |
68 | NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol" ); |
69 | return -EPROTONOSUPPORT; |
70 | } |
71 | } |
72 | |
73 | if (data[IFLA_VLAN_ID]) { |
74 | id = nla_get_u16(nla: data[IFLA_VLAN_ID]); |
75 | if (id >= VLAN_VID_MASK) { |
76 | NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id" ); |
77 | return -ERANGE; |
78 | } |
79 | } |
80 | if (data[IFLA_VLAN_FLAGS]) { |
81 | flags = nla_data(nla: 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" ); |
87 | return -EINVAL; |
88 | } |
89 | } |
90 | |
91 | err = vlan_validate_qos_map(attr: data[IFLA_VLAN_INGRESS_QOS]); |
92 | if (err < 0) { |
93 | NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map" ); |
94 | return err; |
95 | } |
96 | err = vlan_validate_qos_map(attr: data[IFLA_VLAN_EGRESS_QOS]); |
97 | if (err < 0) { |
98 | NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map" ); |
99 | return err; |
100 | } |
101 | return 0; |
102 | } |
103 | |
104 | static int vlan_changelink(struct net_device *dev, struct nlattr *tb[], |
105 | struct nlattr *data[], |
106 | struct netlink_ext_ack *extack) |
107 | { |
108 | struct ifla_vlan_flags *flags; |
109 | struct ifla_vlan_qos_mapping *m; |
110 | struct nlattr *attr; |
111 | int rem, err; |
112 | |
113 | if (data[IFLA_VLAN_FLAGS]) { |
114 | flags = nla_data(nla: data[IFLA_VLAN_FLAGS]); |
115 | err = vlan_dev_change_flags(dev, flag: flags->flags, mask: flags->mask); |
116 | if (err) |
117 | return err; |
118 | } |
119 | if (data[IFLA_VLAN_INGRESS_QOS]) { |
120 | nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) { |
121 | m = nla_data(nla: attr); |
122 | vlan_dev_set_ingress_priority(dev, skb_prio: m->to, vlan_prio: m->from); |
123 | } |
124 | } |
125 | if (data[IFLA_VLAN_EGRESS_QOS]) { |
126 | nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) { |
127 | m = nla_data(nla: attr); |
128 | err = vlan_dev_set_egress_priority(dev, skb_prio: m->from, vlan_prio: m->to); |
129 | if (err) |
130 | return err; |
131 | } |
132 | } |
133 | return 0; |
134 | } |
135 | |
136 | static int vlan_newlink(struct net *src_net, struct net_device *dev, |
137 | struct nlattr *tb[], struct nlattr *data[], |
138 | struct netlink_ext_ack *extack) |
139 | { |
140 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
141 | struct net_device *real_dev; |
142 | unsigned int max_mtu; |
143 | __be16 proto; |
144 | int err; |
145 | |
146 | if (!data[IFLA_VLAN_ID]) { |
147 | NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified" ); |
148 | return -EINVAL; |
149 | } |
150 | |
151 | if (!tb[IFLA_LINK]) { |
152 | NL_SET_ERR_MSG_MOD(extack, "link not specified" ); |
153 | return -EINVAL; |
154 | } |
155 | |
156 | real_dev = __dev_get_by_index(net: src_net, ifindex: nla_get_u32(nla: tb[IFLA_LINK])); |
157 | if (!real_dev) { |
158 | NL_SET_ERR_MSG_MOD(extack, "link does not exist" ); |
159 | return -ENODEV; |
160 | } |
161 | |
162 | if (data[IFLA_VLAN_PROTOCOL]) |
163 | proto = nla_get_be16(nla: data[IFLA_VLAN_PROTOCOL]); |
164 | else |
165 | proto = htons(ETH_P_8021Q); |
166 | |
167 | vlan->vlan_proto = proto; |
168 | vlan->vlan_id = nla_get_u16(nla: data[IFLA_VLAN_ID]); |
169 | vlan->real_dev = real_dev; |
170 | dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE); |
171 | vlan->flags = VLAN_FLAG_REORDER_HDR; |
172 | |
173 | err = vlan_check_real_dev(real_dev, protocol: vlan->vlan_proto, vlan_id: vlan->vlan_id, |
174 | extack); |
175 | if (err < 0) |
176 | return err; |
177 | |
178 | max_mtu = netif_reduces_vlan_mtu(dev: real_dev) ? real_dev->mtu - VLAN_HLEN : |
179 | real_dev->mtu; |
180 | if (!tb[IFLA_MTU]) |
181 | dev->mtu = max_mtu; |
182 | else if (dev->mtu > max_mtu) |
183 | return -EINVAL; |
184 | |
185 | /* Note: If this initial vlan_changelink() fails, we need |
186 | * to call vlan_dev_free_egress_priority() to free memory. |
187 | */ |
188 | err = vlan_changelink(dev, tb, data, extack); |
189 | |
190 | if (!err) |
191 | err = register_vlan_dev(dev, extack); |
192 | |
193 | if (err) |
194 | vlan_dev_free_egress_priority(dev); |
195 | return err; |
196 | } |
197 | |
198 | static inline size_t vlan_qos_map_size(unsigned int n) |
199 | { |
200 | if (n == 0) |
201 | return 0; |
202 | /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */ |
203 | return nla_total_size(payload: sizeof(struct nlattr)) + |
204 | nla_total_size(payload: sizeof(struct ifla_vlan_qos_mapping)) * n; |
205 | } |
206 | |
207 | static size_t vlan_get_size(const struct net_device *dev) |
208 | { |
209 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
210 | |
211 | return nla_total_size(payload: 2) + /* IFLA_VLAN_PROTOCOL */ |
212 | nla_total_size(payload: 2) + /* IFLA_VLAN_ID */ |
213 | nla_total_size(payload: sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */ |
214 | vlan_qos_map_size(n: vlan->nr_ingress_mappings) + |
215 | vlan_qos_map_size(n: vlan->nr_egress_mappings); |
216 | } |
217 | |
218 | static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev) |
219 | { |
220 | struct vlan_dev_priv *vlan = vlan_dev_priv(dev); |
221 | struct vlan_priority_tci_mapping *pm; |
222 | struct ifla_vlan_flags f; |
223 | struct ifla_vlan_qos_mapping m; |
224 | struct nlattr *nest; |
225 | unsigned int i; |
226 | |
227 | if (nla_put_be16(skb, attrtype: IFLA_VLAN_PROTOCOL, value: vlan->vlan_proto) || |
228 | nla_put_u16(skb, attrtype: IFLA_VLAN_ID, value: vlan->vlan_id)) |
229 | goto nla_put_failure; |
230 | if (vlan->flags) { |
231 | f.flags = vlan->flags; |
232 | f.mask = ~0; |
233 | if (nla_put(skb, attrtype: IFLA_VLAN_FLAGS, attrlen: sizeof(f), data: &f)) |
234 | goto nla_put_failure; |
235 | } |
236 | if (vlan->nr_ingress_mappings) { |
237 | nest = nla_nest_start_noflag(skb, attrtype: IFLA_VLAN_INGRESS_QOS); |
238 | if (nest == NULL) |
239 | goto nla_put_failure; |
240 | |
241 | for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) { |
242 | if (!vlan->ingress_priority_map[i]) |
243 | continue; |
244 | |
245 | m.from = i; |
246 | m.to = vlan->ingress_priority_map[i]; |
247 | if (nla_put(skb, attrtype: IFLA_VLAN_QOS_MAPPING, |
248 | attrlen: sizeof(m), data: &m)) |
249 | goto nla_put_failure; |
250 | } |
251 | nla_nest_end(skb, start: nest); |
252 | } |
253 | |
254 | if (vlan->nr_egress_mappings) { |
255 | nest = nla_nest_start_noflag(skb, attrtype: IFLA_VLAN_EGRESS_QOS); |
256 | if (nest == NULL) |
257 | goto nla_put_failure; |
258 | |
259 | for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) { |
260 | for (pm = vlan->egress_priority_map[i]; pm; |
261 | pm = pm->next) { |
262 | if (!pm->vlan_qos) |
263 | continue; |
264 | |
265 | m.from = pm->priority; |
266 | m.to = (pm->vlan_qos >> 13) & 0x7; |
267 | if (nla_put(skb, attrtype: IFLA_VLAN_QOS_MAPPING, |
268 | attrlen: sizeof(m), data: &m)) |
269 | goto nla_put_failure; |
270 | } |
271 | } |
272 | nla_nest_end(skb, start: nest); |
273 | } |
274 | return 0; |
275 | |
276 | nla_put_failure: |
277 | return -EMSGSIZE; |
278 | } |
279 | |
280 | static struct net *vlan_get_link_net(const struct net_device *dev) |
281 | { |
282 | struct net_device *real_dev = vlan_dev_priv(dev)->real_dev; |
283 | |
284 | return dev_net(dev: real_dev); |
285 | } |
286 | |
287 | struct rtnl_link_ops vlan_link_ops __read_mostly = { |
288 | .kind = "vlan" , |
289 | .maxtype = IFLA_VLAN_MAX, |
290 | .policy = vlan_policy, |
291 | .priv_size = sizeof(struct vlan_dev_priv), |
292 | .setup = vlan_setup, |
293 | .validate = vlan_validate, |
294 | .newlink = vlan_newlink, |
295 | .changelink = vlan_changelink, |
296 | .dellink = unregister_vlan_dev, |
297 | .get_size = vlan_get_size, |
298 | .fill_info = vlan_fill_info, |
299 | .get_link_net = vlan_get_link_net, |
300 | }; |
301 | |
302 | int __init vlan_netlink_init(void) |
303 | { |
304 | return rtnl_link_register(ops: &vlan_link_ops); |
305 | } |
306 | |
307 | void __exit vlan_netlink_fini(void) |
308 | { |
309 | rtnl_link_unregister(ops: &vlan_link_ops); |
310 | } |
311 | |
312 | MODULE_ALIAS_RTNL_LINK("vlan" ); |
313 | |