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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                         return -EINVAL;
 52                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 53                         return -EADDRNOTAVAIL;
 54         }
 55 
 56         if (!data)
 57                 return -EINVAL;
 58 
 59         if (data[IFLA_VLAN_PROTOCOL]) {
 60                 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
 61                 case htons(ETH_P_8021Q):
 62                 case htons(ETH_P_8021AD):
 63                         break;
 64                 default:
 65                         return -EPROTONOSUPPORT;
 66                 }
 67         }
 68 
 69         if (data[IFLA_VLAN_ID]) {
 70                 id = nla_get_u16(data[IFLA_VLAN_ID]);
 71                 if (id >= VLAN_VID_MASK)
 72                         return -ERANGE;
 73         }
 74         if (data[IFLA_VLAN_FLAGS]) {
 75                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
 76                 if ((flags->flags & flags->mask) &
 77                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
 78                       VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
 79                         return -EINVAL;
 80         }
 81 
 82         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
 83         if (err < 0)
 84                 return err;
 85         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
 86         if (err < 0)
 87                 return err;
 88         return 0;
 89 }
 90 
 91 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
 92                            struct nlattr *data[],
 93                            struct netlink_ext_ack *extack)
 94 {
 95         struct ifla_vlan_flags *flags;
 96         struct ifla_vlan_qos_mapping *m;
 97         struct nlattr *attr;
 98         int rem;
 99 
100         if (data[IFLA_VLAN_FLAGS]) {
101                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
102                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
103         }
104         if (data[IFLA_VLAN_INGRESS_QOS]) {
105                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
106                         m = nla_data(attr);
107                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
108                 }
109         }
110         if (data[IFLA_VLAN_EGRESS_QOS]) {
111                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
112                         m = nla_data(attr);
113                         vlan_dev_set_egress_priority(dev, m->from, m->to);
114                 }
115         }
116         return 0;
117 }
118 
119 static int vlan_newlink(struct net *src_net, struct net_device *dev,
120                         struct nlattr *tb[], struct nlattr *data[],
121                         struct netlink_ext_ack *extack)
122 {
123         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
124         struct net_device *real_dev;
125         unsigned int max_mtu;
126         __be16 proto;
127         int err;
128 
129         if (!data[IFLA_VLAN_ID])
130                 return -EINVAL;
131 
132         if (!tb[IFLA_LINK])
133                 return -EINVAL;
134         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
135         if (!real_dev)
136                 return -ENODEV;
137 
138         if (data[IFLA_VLAN_PROTOCOL])
139                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
140         else
141                 proto = htons(ETH_P_8021Q);
142 
143         vlan->vlan_proto = proto;
144         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
145         vlan->real_dev   = real_dev;
146         dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
147         vlan->flags      = VLAN_FLAG_REORDER_HDR;
148 
149         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
150         if (err < 0)
151                 return err;
152 
153         max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
154                                                      real_dev->mtu;
155         if (!tb[IFLA_MTU])
156                 dev->mtu = max_mtu;
157         else if (dev->mtu > max_mtu)
158                 return -EINVAL;
159 
160         err = vlan_changelink(dev, tb, data, extack);
161         if (err < 0)
162                 return err;
163 
164         return register_vlan_dev(dev, extack);
165 }
166 
167 static inline size_t vlan_qos_map_size(unsigned int n)
168 {
169         if (n == 0)
170                 return 0;
171         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
172         return nla_total_size(sizeof(struct nlattr)) +
173                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
174 }
175 
176 static size_t vlan_get_size(const struct net_device *dev)
177 {
178         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
179 
180         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
181                nla_total_size(2) +      /* IFLA_VLAN_ID */
182                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
183                vlan_qos_map_size(vlan->nr_ingress_mappings) +
184                vlan_qos_map_size(vlan->nr_egress_mappings);
185 }
186 
187 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
188 {
189         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
190         struct vlan_priority_tci_mapping *pm;
191         struct ifla_vlan_flags f;
192         struct ifla_vlan_qos_mapping m;
193         struct nlattr *nest;
194         unsigned int i;
195 
196         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
197             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
198                 goto nla_put_failure;
199         if (vlan->flags) {
200                 f.flags = vlan->flags;
201                 f.mask  = ~0;
202                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
203                         goto nla_put_failure;
204         }
205         if (vlan->nr_ingress_mappings) {
206                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
207                 if (nest == NULL)
208                         goto nla_put_failure;
209 
210                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
211                         if (!vlan->ingress_priority_map[i])
212                                 continue;
213 
214                         m.from = i;
215                         m.to   = vlan->ingress_priority_map[i];
216                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
217                                     sizeof(m), &m))
218                                 goto nla_put_failure;
219                 }
220                 nla_nest_end(skb, nest);
221         }
222 
223         if (vlan->nr_egress_mappings) {
224                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
225                 if (nest == NULL)
226                         goto nla_put_failure;
227 
228                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
229                         for (pm = vlan->egress_priority_map[i]; pm;
230                              pm = pm->next) {
231                                 if (!pm->vlan_qos)
232                                         continue;
233 
234                                 m.from = pm->priority;
235                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
236                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
237                                             sizeof(m), &m))
238                                         goto nla_put_failure;
239                         }
240                 }
241                 nla_nest_end(skb, nest);
242         }
243         return 0;
244 
245 nla_put_failure:
246         return -EMSGSIZE;
247 }
248 
249 static struct net *vlan_get_link_net(const struct net_device *dev)
250 {
251         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
252 
253         return dev_net(real_dev);
254 }
255 
256 struct rtnl_link_ops vlan_link_ops __read_mostly = {
257         .kind           = "vlan",
258         .maxtype        = IFLA_VLAN_MAX,
259         .policy         = vlan_policy,
260         .priv_size      = sizeof(struct vlan_dev_priv),
261         .setup          = vlan_setup,
262         .validate       = vlan_validate,
263         .newlink        = vlan_newlink,
264         .changelink     = vlan_changelink,
265         .dellink        = unregister_vlan_dev,
266         .get_size       = vlan_get_size,
267         .fill_info      = vlan_fill_info,
268         .get_link_net   = vlan_get_link_net,
269 };
270 
271 int __init vlan_netlink_init(void)
272 {
273         return rtnl_link_register(&vlan_link_ops);
274 }
275 
276 void __exit vlan_netlink_fini(void)
277 {
278         rtnl_link_unregister(&vlan_link_ops);
279 }
280 
281 MODULE_ALIAS_RTNL_LINK("vlan");
282 

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