net/8021q/vlan_netlink.c

   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                         if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
 122                                 continue;
 123                         m = nla_data(attr);
 124                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
 125                 }
 126         }
 127         if (data[IFLA_VLAN_EGRESS_QOS]) {
 128                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
 129                         if (nla_type(attr) != IFLA_VLAN_QOS_MAPPING)
 130                                 continue;
 131                         m = nla_data(attr);
 132                         err = vlan_dev_set_egress_priority(dev, m->from, m->to);
 133                         if (err)
 134                                 return err;
 135                 }
 136         }
 137         return 0;
 138 }
 139
 140 static int vlan_newlink(struct net *src_net, struct net_device *dev,
 141                         struct nlattr *tb[], struct nlattr *data[],
 142                         struct netlink_ext_ack *extack)
 143 {
 144         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 145         struct net_device *real_dev;
 146         unsigned int max_mtu;
 147         __be16 proto;
 148         int err;
 149
 150         if (!data[IFLA_VLAN_ID]) {
 151                 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
 152                 return -EINVAL;
 153         }
 154
 155         if (!tb[IFLA_LINK]) {
 156                 NL_SET_ERR_MSG_MOD(extack, "link not specified");
 157                 return -EINVAL;
 158         }
 159
 160         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 161         if (!real_dev) {
 162                 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
 163                 return -ENODEV;
 164         }
 165
 166         if (data[IFLA_VLAN_PROTOCOL])
 167                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
 168         else
 169                 proto = htons(ETH_P_8021Q);
 170
 171         vlan->vlan_proto = proto;
 172         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
 173         vlan->real_dev   = real_dev;
 174         dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 175         vlan->flags      = VLAN_FLAG_REORDER_HDR;
 176
 177         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
 178                                   extack);
 179         if (err < 0)
 180                 return err;
 181
 182         max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
 183                                                      real_dev->mtu;
 184         if (!tb[IFLA_MTU])
 185                 dev->mtu = max_mtu;
 186         else if (dev->mtu > max_mtu)
 187                 return -EINVAL;
 188
 189         /* Note: If this initial vlan_changelink() fails, we need
 190          * to call vlan_dev_free_egress_priority() to free memory.
 191          */
 192         err = vlan_changelink(dev, tb, data, extack);
 193
 194         if (!err)
 195                 err = register_vlan_dev(dev, extack);
 196
 197         if (err)
 198                 vlan_dev_free_egress_priority(dev);
 199         return err;
 200 }
 201
 202 static inline size_t vlan_qos_map_size(unsigned int n)
 203 {
 204         if (n == 0)
 205                 return 0;
 206         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 207         return nla_total_size(sizeof(struct nlattr)) +
 208                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 209 }
 210
 211 static size_t vlan_get_size(const struct net_device *dev)
 212 {
 213         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 214
 215         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
 216                nla_total_size(2) +      /* IFLA_VLAN_ID */
 217                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
 218                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 219                vlan_qos_map_size(vlan->nr_egress_mappings);
 220 }
 221
 222 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 223 {
 224         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 225         struct vlan_priority_tci_mapping *pm;
 226         struct ifla_vlan_flags f;
 227         struct ifla_vlan_qos_mapping m;
 228         struct nlattr *nest;
 229         unsigned int i;
 230
 231         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
 232             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
 233                 goto nla_put_failure;
 234         if (vlan->flags) {
 235                 f.flags = vlan->flags;
 236                 f.mask  = ~0;
 237                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 238                         goto nla_put_failure;
 239         }
 240         if (vlan->nr_ingress_mappings) {
 241                 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
 242                 if (nest == NULL)
 243                         goto nla_put_failure;
 244
 245                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 246                         if (!vlan->ingress_priority_map[i])
 247                                 continue;
 248
 249                         m.from = i;
 250                         m.to   = vlan->ingress_priority_map[i];
 251                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 252                                     sizeof(m), &m))
 253                                 goto nla_put_failure;
 254                 }
 255                 nla_nest_end(skb, nest);
 256         }
 257
 258         if (vlan->nr_egress_mappings) {
 259                 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
 260                 if (nest == NULL)
 261                         goto nla_put_failure;
 262
 263                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 264                         for (pm = vlan->egress_priority_map[i]; pm;
 265                              pm = pm->next) {
 266                                 if (!pm->vlan_qos)
 267                                         continue;
 268
 269                                 m.from = pm->priority;
 270                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 271                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 272                                             sizeof(m), &m))
 273                                         goto nla_put_failure;
 274                         }
 275                 }
 276                 nla_nest_end(skb, nest);
 277         }
 278         return 0;
 279
 280 nla_put_failure:
 281         return -EMSGSIZE;
 282 }
 283
 284 static struct net *vlan_get_link_net(const struct net_device *dev)
 285 {
 286         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 287
 288         return dev_net(real_dev);
 289 }
 290
 291 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 292         .kind           = "vlan",
 293         .maxtype        = IFLA_VLAN_MAX,
 294         .policy         = vlan_policy,
 295         .priv_size      = sizeof(struct vlan_dev_priv),
 296         .setup          = vlan_setup,
 297         .validate       = vlan_validate,
 298         .newlink        = vlan_newlink,
 299         .changelink     = vlan_changelink,
 300         .dellink        = unregister_vlan_dev,
 301         .get_size       = vlan_get_size,
 302         .fill_info      = vlan_fill_info,
 303         .get_link_net   = vlan_get_link_net,
 304 };
 305
 306 int __init vlan_netlink_init(void)
 307 {
 308         return rtnl_link_register(&vlan_link_ops);
 309 }
 310
 311 void __exit vlan_netlink_fini(void)
 312 {
 313         rtnl_link_unregister(&vlan_link_ops);
 314 }
 315
 316 MODULE_ALIAS_RTNL_LINK("vlan");