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;
 112
 113         if (data[IFLA_VLAN_FLAGS]) {
 114                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
 115                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
 116         }
 117         if (data[IFLA_VLAN_INGRESS_QOS]) {
 118                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
 119                         m = nla_data(attr);
 120                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
 121                 }
 122         }
 123         if (data[IFLA_VLAN_EGRESS_QOS]) {
 124                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
 125                         m = nla_data(attr);
 126                         vlan_dev_set_egress_priority(dev, m->from, m->to);
 127                 }
 128         }
 129         return 0;
 130 }
 131
 132 static int vlan_newlink(struct net *src_net, struct net_device *dev,
 133                         struct nlattr *tb[], struct nlattr *data[],
 134                         struct netlink_ext_ack *extack)
 135 {
 136         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 137         struct net_device *real_dev;
 138         unsigned int max_mtu;
 139         __be16 proto;
 140         int err;
 141
 142         if (!data[IFLA_VLAN_ID]) {
 143                 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
 144                 return -EINVAL;
 145         }
 146
 147         if (!tb[IFLA_LINK]) {
 148                 NL_SET_ERR_MSG_MOD(extack, "link not specified");
 149                 return -EINVAL;
 150         }
 151
 152         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 153         if (!real_dev) {
 154                 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
 155                 return -ENODEV;
 156         }
 157
 158         if (data[IFLA_VLAN_PROTOCOL])
 159                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
 160         else
 161                 proto = htons(ETH_P_8021Q);
 162
 163         vlan->vlan_proto = proto;
 164         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
 165         vlan->real_dev   = real_dev;
 166         dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 167         vlan->flags      = VLAN_FLAG_REORDER_HDR;
 168
 169         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
 170                                   extack);
 171         if (err < 0)
 172                 return err;
 173
 174         max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
 175                                                      real_dev->mtu;
 176         if (!tb[IFLA_MTU])
 177                 dev->mtu = max_mtu;
 178         else if (dev->mtu > max_mtu)
 179                 return -EINVAL;
 180
 181         err = vlan_changelink(dev, tb, data, extack);
 182         if (err < 0)
 183                 return err;
 184
 185         return register_vlan_dev(dev, extack);
 186 }
 187
 188 static inline size_t vlan_qos_map_size(unsigned int n)
 189 {
 190         if (n == 0)
 191                 return 0;
 192         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 193         return nla_total_size(sizeof(struct nlattr)) +
 194                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 195 }
 196
 197 static size_t vlan_get_size(const struct net_device *dev)
 198 {
 199         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 200
 201         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
 202                nla_total_size(2) +      /* IFLA_VLAN_ID */
 203                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
 204                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 205                vlan_qos_map_size(vlan->nr_egress_mappings);
 206 }
 207
 208 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 209 {
 210         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 211         struct vlan_priority_tci_mapping *pm;
 212         struct ifla_vlan_flags f;
 213         struct ifla_vlan_qos_mapping m;
 214         struct nlattr *nest;
 215         unsigned int i;
 216
 217         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
 218             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
 219                 goto nla_put_failure;
 220         if (vlan->flags) {
 221                 f.flags = vlan->flags;
 222                 f.mask  = ~0;
 223                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 224                         goto nla_put_failure;
 225         }
 226         if (vlan->nr_ingress_mappings) {
 227                 nest = nla_nest_start_noflag(skb, IFLA_VLAN_INGRESS_QOS);
 228                 if (nest == NULL)
 229                         goto nla_put_failure;
 230
 231                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 232                         if (!vlan->ingress_priority_map[i])
 233                                 continue;
 234
 235                         m.from = i;
 236                         m.to   = vlan->ingress_priority_map[i];
 237                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 238                                     sizeof(m), &m))
 239                                 goto nla_put_failure;
 240                 }
 241                 nla_nest_end(skb, nest);
 242         }
 243
 244         if (vlan->nr_egress_mappings) {
 245                 nest = nla_nest_start_noflag(skb, IFLA_VLAN_EGRESS_QOS);
 246                 if (nest == NULL)
 247                         goto nla_put_failure;
 248
 249                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 250                         for (pm = vlan->egress_priority_map[i]; pm;
 251                              pm = pm->next) {
 252                                 if (!pm->vlan_qos)
 253                                         continue;
 254
 255                                 m.from = pm->priority;
 256                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 257                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 258                                             sizeof(m), &m))
 259                                         goto nla_put_failure;
 260                         }
 261                 }
 262                 nla_nest_end(skb, nest);
 263         }
 264         return 0;
 265
 266 nla_put_failure:
 267         return -EMSGSIZE;
 268 }
 269
 270 static struct net *vlan_get_link_net(const struct net_device *dev)
 271 {
 272         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 273
 274         return dev_net(real_dev);
 275 }
 276
 277 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 278         .kind           = "vlan",
 279         .maxtype        = IFLA_VLAN_MAX,
 280         .policy         = vlan_policy,
 281         .priv_size      = sizeof(struct vlan_dev_priv),
 282         .setup          = vlan_setup,
 283         .validate       = vlan_validate,
 284         .newlink        = vlan_newlink,
 285         .changelink     = vlan_changelink,
 286         .dellink        = unregister_vlan_dev,
 287         .get_size       = vlan_get_size,
 288         .fill_info      = vlan_fill_info,
 289         .get_link_net   = vlan_get_link_net,
 290 };
 291
 292 int __init vlan_netlink_init(void)
 293 {
 294         return rtnl_link_register(&vlan_link_ops);
 295 }
 296
 297 void __exit vlan_netlink_fini(void)
 298 {
 299         rtnl_link_unregister(&vlan_link_ops);
 300 }
 301
 302 MODULE_ALIAS_RTNL_LINK("vlan");