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                          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, err;
  99
 100         if (data[IFLA_VLAN_FLAGS]) {
 101                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
 102                 err = vlan_dev_change_flags(dev, flags->flags, flags->mask);
 103                 if (err)
 104                         return err;
 105         }
 106         if (data[IFLA_VLAN_INGRESS_QOS]) {
 107                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
 108                         m = nla_data(attr);
 109                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
 110                 }
 111         }
 112         if (data[IFLA_VLAN_EGRESS_QOS]) {
 113                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
 114                         m = nla_data(attr);
 115                         err = vlan_dev_set_egress_priority(dev, m->from, m->to);
 116                         if (err)
 117                                 return err;
 118                 }
 119         }
 120         return 0;
 121 }
 122
 123 static int vlan_newlink(struct net *src_net, struct net_device *dev,
 124                         struct nlattr *tb[], struct nlattr *data[],
 125                         struct netlink_ext_ack *extack)
 126 {
 127         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 128         struct net_device *real_dev;
 129         unsigned int max_mtu;
 130         __be16 proto;
 131         int err;
 132
 133         if (!data[IFLA_VLAN_ID])
 134                 return -EINVAL;
 135
 136         if (!tb[IFLA_LINK])
 137                 return -EINVAL;
 138         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 139         if (!real_dev)
 140                 return -ENODEV;
 141
 142         if (data[IFLA_VLAN_PROTOCOL])
 143                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
 144         else
 145                 proto = htons(ETH_P_8021Q);
 146
 147         vlan->vlan_proto = proto;
 148         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
 149         vlan->real_dev   = real_dev;
 150         vlan->flags      = VLAN_FLAG_REORDER_HDR;
 151
 152         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
 153         if (err < 0)
 154                 return err;
 155
 156         max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
 157                                                      real_dev->mtu;
 158         if (!tb[IFLA_MTU])
 159                 dev->mtu = max_mtu;
 160         else if (dev->mtu > max_mtu)
 161                 return -EINVAL;
 162
 163         err = vlan_changelink(dev, tb, data, extack);
 164         if (!err)
 165                 err = register_vlan_dev(dev);
 166         if (err)
 167                 vlan_dev_uninit(dev);
 168         return err;
 169 }
 170
 171 static inline size_t vlan_qos_map_size(unsigned int n)
 172 {
 173         if (n == 0)
 174                 return 0;
 175         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 176         return nla_total_size(sizeof(struct nlattr)) +
 177                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 178 }
 179
 180 static size_t vlan_get_size(const struct net_device *dev)
 181 {
 182         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 183
 184         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
 185                nla_total_size(2) +      /* IFLA_VLAN_ID */
 186                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
 187                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 188                vlan_qos_map_size(vlan->nr_egress_mappings);
 189 }
 190
 191 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 192 {
 193         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 194         struct vlan_priority_tci_mapping *pm;
 195         struct ifla_vlan_flags f;
 196         struct ifla_vlan_qos_mapping m;
 197         struct nlattr *nest;
 198         unsigned int i;
 199
 200         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
 201             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
 202                 goto nla_put_failure;
 203         if (vlan->flags) {
 204                 f.flags = vlan->flags;
 205                 f.mask  = ~0;
 206                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 207                         goto nla_put_failure;
 208         }
 209         if (vlan->nr_ingress_mappings) {
 210                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 211                 if (nest == NULL)
 212                         goto nla_put_failure;
 213
 214                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 215                         if (!vlan->ingress_priority_map[i])
 216                                 continue;
 217
 218                         m.from = i;
 219                         m.to   = vlan->ingress_priority_map[i];
 220                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 221                                     sizeof(m), &m))
 222                                 goto nla_put_failure;
 223                 }
 224                 nla_nest_end(skb, nest);
 225         }
 226
 227         if (vlan->nr_egress_mappings) {
 228                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 229                 if (nest == NULL)
 230                         goto nla_put_failure;
 231
 232                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 233                         for (pm = vlan->egress_priority_map[i]; pm;
 234                              pm = pm->next) {
 235                                 if (!pm->vlan_qos)
 236                                         continue;
 237
 238                                 m.from = pm->priority;
 239                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 240                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 241                                             sizeof(m), &m))
 242                                         goto nla_put_failure;
 243                         }
 244                 }
 245                 nla_nest_end(skb, nest);
 246         }
 247         return 0;
 248
 249 nla_put_failure:
 250         return -EMSGSIZE;
 251 }
 252
 253 static struct net *vlan_get_link_net(const struct net_device *dev)
 254 {
 255         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 256
 257         return dev_net(real_dev);
 258 }
 259
 260 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 261         .kind           = "vlan",
 262         .maxtype        = IFLA_VLAN_MAX,
 263         .policy         = vlan_policy,
 264         .priv_size      = sizeof(struct vlan_dev_priv),
 265         .setup          = vlan_setup,
 266         .validate       = vlan_validate,
 267         .newlink        = vlan_newlink,
 268         .changelink     = vlan_changelink,
 269         .dellink        = unregister_vlan_dev,
 270         .get_size       = vlan_get_size,
 271         .fill_info      = vlan_fill_info,
 272         .get_link_net   = vlan_get_link_net,
 273 };
 274
 275 int __init vlan_netlink_init(void)
 276 {
 277         return rtnl_link_register(&vlan_link_ops);
 278 }
 279
 280 void __exit vlan_netlink_fini(void)
 281 {
 282         rtnl_link_unregister(&vlan_link_ops);
 283 }
 284
 285 MODULE_ALIAS_RTNL_LINK("vlan");