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Linux/net/8021q/vlan_netlink.c

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  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         err = vlan_changelink(dev, tb, data, extack);
186         if (!err)
187                 err = register_vlan_dev(dev, extack);
188         if (err)
189                 vlan_dev_uninit(dev);
190         return err;
191 }
192 
193 static inline size_t vlan_qos_map_size(unsigned int n)
194 {
195         if (n == 0)
196                 return 0;
197         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
198         return nla_total_size(sizeof(struct nlattr)) +
199                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
200 }
201 
202 static size_t vlan_get_size(const struct net_device *dev)
203 {
204         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
205 
206         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
207                nla_total_size(2) +      /* IFLA_VLAN_ID */
208                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
209                vlan_qos_map_size(vlan->nr_ingress_mappings) +
210                vlan_qos_map_size(vlan->nr_egress_mappings);
211 }
212 
213 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
214 {
215         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
216         struct vlan_priority_tci_mapping *pm;
217         struct ifla_vlan_flags f;
218         struct ifla_vlan_qos_mapping m;
219         struct nlattr *nest;
220         unsigned int i;
221 
222         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
223             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
224                 goto nla_put_failure;
225         if (vlan->flags) {
226                 f.flags = vlan->flags;
227                 f.mask  = ~0;
228                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
229                         goto nla_put_failure;
230         }
231         if (vlan->nr_ingress_mappings) {
232                 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
233                 if (nest == NULL)
234                         goto nla_put_failure;
235 
236                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
237                         if (!vlan->ingress_priority_map[i])
238                                 continue;
239 
240                         m.from = i;
241                         m.to   = vlan->ingress_priority_map[i];
242                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
243                                     sizeof(m), &m))
244                                 goto nla_put_failure;
245                 }
246                 nla_nest_end(skb, nest);
247         }
248 
249         if (vlan->nr_egress_mappings) {
250                 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
251                 if (nest == NULL)
252                         goto nla_put_failure;
253 
254                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
255                         for (pm = vlan->egress_priority_map[i]; pm;
256                              pm = pm->next) {
257                                 if (!pm->vlan_qos)
258                                         continue;
259 
260                                 m.from = pm->priority;
261                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
262                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
263                                             sizeof(m), &m))
264                                         goto nla_put_failure;
265                         }
266                 }
267                 nla_nest_end(skb, nest);
268         }
269         return 0;
270 
271 nla_put_failure:
272         return -EMSGSIZE;
273 }
274 
275 static struct net *vlan_get_link_net(const struct net_device *dev)
276 {
277         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
278 
279         return dev_net(real_dev);
280 }
281 
282 struct rtnl_link_ops vlan_link_ops __read_mostly = {
283         .kind           = "vlan",
284         .maxtype        = IFLA_VLAN_MAX,
285         .policy         = vlan_policy,
286         .priv_size      = sizeof(struct vlan_dev_priv),
287         .setup          = vlan_setup,
288         .validate       = vlan_validate,
289         .newlink        = vlan_newlink,
290         .changelink     = vlan_changelink,
291         .dellink        = unregister_vlan_dev,
292         .get_size       = vlan_get_size,
293         .fill_info      = vlan_fill_info,
294         .get_link_net   = vlan_get_link_net,
295 };
296 
297 int __init vlan_netlink_init(void)
298 {
299         return rtnl_link_register(&vlan_link_ops);
300 }
301 
302 void __exit vlan_netlink_fini(void)
303 {
304         rtnl_link_unregister(&vlan_link_ops);
305 }
306 
307 MODULE_ALIAS_RTNL_LINK("vlan");
308 

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