net/8021q/vlan_netlink.c

   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 {
  44         struct ifla_vlan_flags *flags;
  45         u16 id;
  46         int err;
  47
  48         if (tb[IFLA_ADDRESS]) {
  49                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
  50                         return -EINVAL;
  51                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
  52                         return -EADDRNOTAVAIL;
  53         }
  54
  55         if (!data)
  56                 return -EINVAL;
  57
  58         if (data[IFLA_VLAN_PROTOCOL]) {
  59                 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
  60                 case htons(ETH_P_8021Q):
  61                 case htons(ETH_P_8021AD):
  62                         break;
  63                 default:
  64                         return -EPROTONOSUPPORT;
  65                 }
  66         }
  67
  68         if (data[IFLA_VLAN_ID]) {
  69                 id = nla_get_u16(data[IFLA_VLAN_ID]);
  70                 if (id >= VLAN_VID_MASK)
  71                         return -ERANGE;
  72         }
  73         if (data[IFLA_VLAN_FLAGS]) {
  74                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  75                 if ((flags->flags & flags->mask) &
  76                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
  77                       VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
  78                         return -EINVAL;
  79         }
  80
  81         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
  82         if (err < 0)
  83                 return err;
  84         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
  85         if (err < 0)
  86                 return err;
  87         return 0;
  88 }
  89
  90 static int vlan_changelink(struct net_device *dev,
  91                            struct nlattr *tb[], struct nlattr *data[])
  92 {
  93         struct ifla_vlan_flags *flags;
  94         struct ifla_vlan_qos_mapping *m;
  95         struct nlattr *attr;
  96         int rem;
  97
  98         if (data[IFLA_VLAN_FLAGS]) {
  99                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
 100                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
 101         }
 102         if (data[IFLA_VLAN_INGRESS_QOS]) {
 103                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
 104                         m = nla_data(attr);
 105                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
 106                 }
 107         }
 108         if (data[IFLA_VLAN_EGRESS_QOS]) {
 109                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
 110                         m = nla_data(attr);
 111                         vlan_dev_set_egress_priority(dev, m->from, m->to);
 112                 }
 113         }
 114         return 0;
 115 }
 116
 117 static int vlan_newlink(struct net *src_net, struct net_device *dev,
 118                         struct nlattr *tb[], struct nlattr *data[])
 119 {
 120         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 121         struct net_device *real_dev;
 122         unsigned int max_mtu;
 123         __be16 proto;
 124         int err;
 125
 126         if (!data[IFLA_VLAN_ID])
 127                 return -EINVAL;
 128
 129         if (!tb[IFLA_LINK])
 130                 return -EINVAL;
 131         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 132         if (!real_dev)
 133                 return -ENODEV;
 134
 135         if (data[IFLA_VLAN_PROTOCOL])
 136                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
 137         else
 138                 proto = htons(ETH_P_8021Q);
 139
 140         vlan->vlan_proto = proto;
 141         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
 142         vlan->real_dev   = real_dev;
 143         vlan->flags      = VLAN_FLAG_REORDER_HDR;
 144
 145         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
 146         if (err < 0)
 147                 return err;
 148
 149         max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
 150                                                      real_dev->mtu;
 151         if (!tb[IFLA_MTU])
 152                 dev->mtu = max_mtu;
 153         else if (dev->mtu > max_mtu)
 154                 return -EINVAL;
 155
 156         err = vlan_changelink(dev, tb, data);
 157         if (err < 0)
 158                 return err;
 159
 160         return register_vlan_dev(dev);
 161 }
 162
 163 static inline size_t vlan_qos_map_size(unsigned int n)
 164 {
 165         if (n == 0)
 166                 return 0;
 167         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 168         return nla_total_size(sizeof(struct nlattr)) +
 169                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 170 }
 171
 172 static size_t vlan_get_size(const struct net_device *dev)
 173 {
 174         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 175
 176         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
 177                nla_total_size(2) +      /* IFLA_VLAN_ID */
 178                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
 179                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 180                vlan_qos_map_size(vlan->nr_egress_mappings);
 181 }
 182
 183 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 184 {
 185         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 186         struct vlan_priority_tci_mapping *pm;
 187         struct ifla_vlan_flags f;
 188         struct ifla_vlan_qos_mapping m;
 189         struct nlattr *nest;
 190         unsigned int i;
 191
 192         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
 193             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
 194                 goto nla_put_failure;
 195         if (vlan->flags) {
 196                 f.flags = vlan->flags;
 197                 f.mask  = ~0;
 198                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 199                         goto nla_put_failure;
 200         }
 201         if (vlan->nr_ingress_mappings) {
 202                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 203                 if (nest == NULL)
 204                         goto nla_put_failure;
 205
 206                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 207                         if (!vlan->ingress_priority_map[i])
 208                                 continue;
 209
 210                         m.from = i;
 211                         m.to   = vlan->ingress_priority_map[i];
 212                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 213                                     sizeof(m), &m))
 214                                 goto nla_put_failure;
 215                 }
 216                 nla_nest_end(skb, nest);
 217         }
 218
 219         if (vlan->nr_egress_mappings) {
 220                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 221                 if (nest == NULL)
 222                         goto nla_put_failure;
 223
 224                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 225                         for (pm = vlan->egress_priority_map[i]; pm;
 226                              pm = pm->next) {
 227                                 if (!pm->vlan_qos)
 228                                         continue;
 229
 230                                 m.from = pm->priority;
 231                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 232                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 233                                             sizeof(m), &m))
 234                                         goto nla_put_failure;
 235                         }
 236                 }
 237                 nla_nest_end(skb, nest);
 238         }
 239         return 0;
 240
 241 nla_put_failure:
 242         return -EMSGSIZE;
 243 }
 244
 245 static struct net *vlan_get_link_net(const struct net_device *dev)
 246 {
 247         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 248
 249         return dev_net(real_dev);
 250 }
 251
 252 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 253         .kind           = "vlan",
 254         .maxtype        = IFLA_VLAN_MAX,
 255         .policy         = vlan_policy,
 256         .priv_size      = sizeof(struct vlan_dev_priv),
 257         .setup          = vlan_setup,
 258         .validate       = vlan_validate,
 259         .newlink        = vlan_newlink,
 260         .changelink     = vlan_changelink,
 261         .dellink        = unregister_vlan_dev,
 262         .get_size       = vlan_get_size,
 263         .fill_info      = vlan_fill_info,
 264         .get_link_net   = vlan_get_link_net,
 265 };
 266
 267 int __init vlan_netlink_init(void)
 268 {
 269         return rtnl_link_register(&vlan_link_ops);
 270 }
 271
 272 void __exit vlan_netlink_fini(void)
 273 {
 274         rtnl_link_unregister(&vlan_link_ops);
 275 }
 276
 277 MODULE_ALIAS_RTNL_LINK("vlan");