Merge drm/drm-next into drm-intel-gt-next
[platform/kernel/linux-rpi.git] / net / 8021q / vlan_netlink.c
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(attr, IFLA_VLAN_QOS_MAX,
36                                               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(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(nla_data(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(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(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(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(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(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(data[IFLA_VLAN_FLAGS]);
115                 err = vlan_dev_change_flags(dev, flags->flags, 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(attr);
122                         vlan_dev_set_ingress_priority(dev, m->to, 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(attr);
128                         err = vlan_dev_set_egress_priority(dev, m->from, 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(src_net, nla_get_u32(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(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(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, vlan->vlan_proto, vlan->vlan_id,
174                                   extack);
175         if (err < 0)
176                 return err;
177
178         max_mtu = netif_reduces_vlan_mtu(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(sizeof(struct nlattr)) +
204                nla_total_size(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(2) +      /* IFLA_VLAN_PROTOCOL */
212                nla_total_size(2) +      /* IFLA_VLAN_ID */
213                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
214                vlan_qos_map_size(vlan->nr_ingress_mappings) +
215                vlan_qos_map_size(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, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
228             nla_put_u16(skb, IFLA_VLAN_ID, 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, IFLA_VLAN_FLAGS, sizeof(f), &f))
234                         goto nla_put_failure;
235         }
236         if (vlan->nr_ingress_mappings) {
237                 nest = nla_nest_start_noflag(skb, 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, IFLA_VLAN_QOS_MAPPING,
248                                     sizeof(m), &m))
249                                 goto nla_put_failure;
250                 }
251                 nla_nest_end(skb, nest);
252         }
253
254         if (vlan->nr_egress_mappings) {
255                 nest = nla_nest_start_noflag(skb, 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, IFLA_VLAN_QOS_MAPPING,
268                                             sizeof(m), &m))
269                                         goto nla_put_failure;
270                         }
271                 }
272                 nla_nest_end(skb, 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(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(&vlan_link_ops);
305 }
306
307 void __exit vlan_netlink_fini(void)
308 {
309         rtnl_link_unregister(&vlan_link_ops);
310 }
311
312 MODULE_ALIAS_RTNL_LINK("vlan");