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Linux/net/8021q/vlan_netlink.c

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  1 /*
  2  *      VLAN netlink control interface
  3  *
  4  *      Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
  5  *
  6  *      This program is free software; you can redistribute it and/or
  7  *      modify it under the terms of the GNU General Public License
  8  *      version 2 as published by the Free Software Foundation.
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/netdevice.h>
 13 #include <linux/if_vlan.h>
 14 #include <linux/module.h>
 15 #include <net/net_namespace.h>
 16 #include <net/netlink.h>
 17 #include <net/rtnetlink.h>
 18 #include "vlan.h"
 19 
 20 
 21 static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
 22         [IFLA_VLAN_ID]          = { .type = NLA_U16 },
 23         [IFLA_VLAN_FLAGS]       = { .len = sizeof(struct ifla_vlan_flags) },
 24         [IFLA_VLAN_EGRESS_QOS]  = { .type = NLA_NESTED },
 25         [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
 26         [IFLA_VLAN_PROTOCOL]    = { .type = NLA_U16 },
 27 };
 28 
 29 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
 30         [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
 31 };
 32 
 33 
 34 static inline int vlan_validate_qos_map(struct nlattr *attr)
 35 {
 36         if (!attr)
 37                 return 0;
 38         return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy,
 39                                    NULL);
 40 }
 41 
 42 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[],
 43                          struct netlink_ext_ack *extack)
 44 {
 45         struct ifla_vlan_flags *flags;
 46         u16 id;
 47         int err;
 48 
 49         if (tb[IFLA_ADDRESS]) {
 50                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) {
 51                         NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
 52                         return -EINVAL;
 53                 }
 54                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
 55                         NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
 56                         return -EADDRNOTAVAIL;
 57                 }
 58         }
 59 
 60         if (!data) {
 61                 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
 62                 return -EINVAL;
 63         }
 64 
 65         if (data[IFLA_VLAN_PROTOCOL]) {
 66                 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
 67                 case htons(ETH_P_8021Q):
 68                 case htons(ETH_P_8021AD):
 69                         break;
 70                 default:
 71                         NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
 72                         return -EPROTONOSUPPORT;
 73                 }
 74         }
 75 
 76         if (data[IFLA_VLAN_ID]) {
 77                 id = nla_get_u16(data[IFLA_VLAN_ID]);
 78                 if (id >= VLAN_VID_MASK) {
 79                         NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id");
 80                         return -ERANGE;
 81                 }
 82         }
 83         if (data[IFLA_VLAN_FLAGS]) {
 84                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
 85                 if ((flags->flags & flags->mask) &
 86                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 87                       VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) {
 88                         NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
 89                         return -EINVAL;
 90                 }
 91         }
 92 
 93         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
 94         if (err < 0) {
 95                 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
 96                 return err;
 97         }
 98         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
 99         if (err < 0) {
100                 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
101                 return err;
102         }
103         return 0;
104 }
105 
106 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
107                            struct nlattr *data[],
108                            struct netlink_ext_ack *extack)
109 {
110         struct ifla_vlan_flags *flags;
111         struct ifla_vlan_qos_mapping *m;
112         struct nlattr *attr;
113         int rem;
114 
115         if (data[IFLA_VLAN_FLAGS]) {
116                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
117                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
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                         vlan_dev_set_egress_priority(dev, m->from, m->to);
129                 }
130         }
131         return 0;
132 }
133 
134 static int vlan_newlink(struct net *src_net, struct net_device *dev,
135                         struct nlattr *tb[], struct nlattr *data[],
136                         struct netlink_ext_ack *extack)
137 {
138         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
139         struct net_device *real_dev;
140         unsigned int max_mtu;
141         __be16 proto;
142         int err;
143 
144         if (!data[IFLA_VLAN_ID]) {
145                 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
146                 return -EINVAL;
147         }
148 
149         if (!tb[IFLA_LINK]) {
150                 NL_SET_ERR_MSG_MOD(extack, "link not specified");
151                 return -EINVAL;
152         }
153 
154         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
155         if (!real_dev) {
156                 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
157                 return -ENODEV;
158         }
159 
160         if (data[IFLA_VLAN_PROTOCOL])
161                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
162         else
163                 proto = htons(ETH_P_8021Q);
164 
165         vlan->vlan_proto = proto;
166         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
167         vlan->real_dev   = real_dev;
168         dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
169         vlan->flags      = VLAN_FLAG_REORDER_HDR;
170 
171         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
172                                   extack);
173         if (err < 0)
174                 return err;
175 
176         max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
177                                                      real_dev->mtu;
178         if (!tb[IFLA_MTU])
179                 dev->mtu = max_mtu;
180         else if (dev->mtu > max_mtu)
181                 return -EINVAL;
182 
183         err = vlan_changelink(dev, tb, data, extack);
184         if (err < 0)
185                 return err;
186 
187         return register_vlan_dev(dev, extack);
188 }
189 
190 static inline size_t vlan_qos_map_size(unsigned int n)
191 {
192         if (n == 0)
193                 return 0;
194         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
195         return nla_total_size(sizeof(struct nlattr)) +
196                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
197 }
198 
199 static size_t vlan_get_size(const struct net_device *dev)
200 {
201         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
202 
203         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
204                nla_total_size(2) +      /* IFLA_VLAN_ID */
205                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
206                vlan_qos_map_size(vlan->nr_ingress_mappings) +
207                vlan_qos_map_size(vlan->nr_egress_mappings);
208 }
209 
210 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
211 {
212         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
213         struct vlan_priority_tci_mapping *pm;
214         struct ifla_vlan_flags f;
215         struct ifla_vlan_qos_mapping m;
216         struct nlattr *nest;
217         unsigned int i;
218 
219         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
220             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
221                 goto nla_put_failure;
222         if (vlan->flags) {
223                 f.flags = vlan->flags;
224                 f.mask  = ~0;
225                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
226                         goto nla_put_failure;
227         }
228         if (vlan->nr_ingress_mappings) {
229                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
230                 if (nest == NULL)
231                         goto nla_put_failure;
232 
233                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
234                         if (!vlan->ingress_priority_map[i])
235                                 continue;
236 
237                         m.from = i;
238                         m.to   = vlan->ingress_priority_map[i];
239                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
240                                     sizeof(m), &m))
241                                 goto nla_put_failure;
242                 }
243                 nla_nest_end(skb, nest);
244         }
245 
246         if (vlan->nr_egress_mappings) {
247                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
248                 if (nest == NULL)
249                         goto nla_put_failure;
250 
251                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
252                         for (pm = vlan->egress_priority_map[i]; pm;
253                              pm = pm->next) {
254                                 if (!pm->vlan_qos)
255                                         continue;
256 
257                                 m.from = pm->priority;
258                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
259                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
260                                             sizeof(m), &m))
261                                         goto nla_put_failure;
262                         }
263                 }
264                 nla_nest_end(skb, nest);
265         }
266         return 0;
267 
268 nla_put_failure:
269         return -EMSGSIZE;
270 }
271 
272 static struct net *vlan_get_link_net(const struct net_device *dev)
273 {
274         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
275 
276         return dev_net(real_dev);
277 }
278 
279 struct rtnl_link_ops vlan_link_ops __read_mostly = {
280         .kind           = "vlan",
281         .maxtype        = IFLA_VLAN_MAX,
282         .policy         = vlan_policy,
283         .priv_size      = sizeof(struct vlan_dev_priv),
284         .setup          = vlan_setup,
285         .validate       = vlan_validate,
286         .newlink        = vlan_newlink,
287         .changelink     = vlan_changelink,
288         .dellink        = unregister_vlan_dev,
289         .get_size       = vlan_get_size,
290         .fill_info      = vlan_fill_info,
291         .get_link_net   = vlan_get_link_net,
292 };
293 
294 int __init vlan_netlink_init(void)
295 {
296         return rtnl_link_register(&vlan_link_ops);
297 }
298 
299 void __exit vlan_netlink_fini(void)
300 {
301         rtnl_link_unregister(&vlan_link_ops);
302 }
303 
304 MODULE_ALIAS_RTNL_LINK("vlan");
305 

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