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                         NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
  52                         return -EINVAL;
  53                 }
  54                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) {
  55                         NL_SET_ERR_MSG_MOD(extack, "Invalid link address");
  56                         return -EADDRNOTAVAIL;
  57                 }
  58         }
  59
  60         if (!data) {
  61                 NL_SET_ERR_MSG_MOD(extack, "VLAN properties not specified");
  62                 return -EINVAL;
  63         }
  64
  65         if (data[IFLA_VLAN_PROTOCOL]) {
  66                 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
  67                 case htons(ETH_P_8021Q):
  68                 case htons(ETH_P_8021AD):
  69                         break;
  70                 default:
  71                         NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN protocol");
  72                         return -EPROTONOSUPPORT;
  73                 }
  74         }
  75
  76         if (data[IFLA_VLAN_ID]) {
  77                 id = nla_get_u16(data[IFLA_VLAN_ID]);
  78                 if (id >= VLAN_VID_MASK) {
  79                         NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN id");
  80                         return -ERANGE;
  81                 }
  82         }
  83         if (data[IFLA_VLAN_FLAGS]) {
  84                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  85                 if ((flags->flags & flags->mask) &
  86                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
  87                       VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP)) {
  88                         NL_SET_ERR_MSG_MOD(extack, "Invalid VLAN flags");
  89                         return -EINVAL;
  90                 }
  91         }
  92
  93         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
  94         if (err < 0) {
  95                 NL_SET_ERR_MSG_MOD(extack, "Invalid ingress QOS map");
  96                 return err;
  97         }
  98         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
  99         if (err < 0) {
 100                 NL_SET_ERR_MSG_MOD(extack, "Invalid egress QOS map");
 101                 return err;
 102         }
 103         return 0;
 104 }
 105
 106 static int vlan_changelink(struct net_device *dev, struct nlattr *tb[],
 107                            struct nlattr *data[],
 108                            struct netlink_ext_ack *extack)
 109 {
 110         struct ifla_vlan_flags *flags;
 111         struct ifla_vlan_qos_mapping *m;
 112         struct nlattr *attr;
 113         int rem;
 114
 115         if (data[IFLA_VLAN_FLAGS]) {
 116                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
 117                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
 118         }
 119         if (data[IFLA_VLAN_INGRESS_QOS]) {
 120                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
 121                         m = nla_data(attr);
 122                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
 123                 }
 124         }
 125         if (data[IFLA_VLAN_EGRESS_QOS]) {
 126                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
 127                         m = nla_data(attr);
 128                         vlan_dev_set_egress_priority(dev, m->from, m->to);
 129                 }
 130         }
 131         return 0;
 132 }
 133
 134 static int vlan_newlink(struct net *src_net, struct net_device *dev,
 135                         struct nlattr *tb[], struct nlattr *data[],
 136                         struct netlink_ext_ack *extack)
 137 {
 138         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 139         struct net_device *real_dev;
 140         unsigned int max_mtu;
 141         __be16 proto;
 142         int err;
 143
 144         if (!data[IFLA_VLAN_ID]) {
 145                 NL_SET_ERR_MSG_MOD(extack, "VLAN id not specified");
 146                 return -EINVAL;
 147         }
 148
 149         if (!tb[IFLA_LINK]) {
 150                 NL_SET_ERR_MSG_MOD(extack, "link not specified");
 151                 return -EINVAL;
 152         }
 153
 154         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 155         if (!real_dev) {
 156                 NL_SET_ERR_MSG_MOD(extack, "link does not exist");
 157                 return -ENODEV;
 158         }
 159
 160         if (data[IFLA_VLAN_PROTOCOL])
 161                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
 162         else
 163                 proto = htons(ETH_P_8021Q);
 164
 165         vlan->vlan_proto = proto;
 166         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
 167         vlan->real_dev   = real_dev;
 168         dev->priv_flags |= (real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 169         vlan->flags      = VLAN_FLAG_REORDER_HDR;
 170
 171         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id,
 172                                   extack);
 173         if (err < 0)
 174                 return err;
 175
 176         max_mtu = netif_reduces_vlan_mtu(real_dev) ? real_dev->mtu - VLAN_HLEN :
 177                                                      real_dev->mtu;
 178         if (!tb[IFLA_MTU])
 179                 dev->mtu = max_mtu;
 180         else if (dev->mtu > max_mtu)
 181                 return -EINVAL;
 182
 183         err = vlan_changelink(dev, tb, data, extack);
 184         if (err < 0)
 185                 return err;
 186
 187         return register_vlan_dev(dev, extack);
 188 }
 189
 190 static inline size_t vlan_qos_map_size(unsigned int n)
 191 {
 192         if (n == 0)
 193                 return 0;
 194         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 195         return nla_total_size(sizeof(struct nlattr)) +
 196                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 197 }
 198
 199 static size_t vlan_get_size(const struct net_device *dev)
 200 {
 201         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 202
 203         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
 204                nla_total_size(2) +      /* IFLA_VLAN_ID */
 205                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
 206                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 207                vlan_qos_map_size(vlan->nr_egress_mappings);
 208 }
 209
 210 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 211 {
 212         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 213         struct vlan_priority_tci_mapping *pm;
 214         struct ifla_vlan_flags f;
 215         struct ifla_vlan_qos_mapping m;
 216         struct nlattr *nest;
 217         unsigned int i;
 218
 219         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
 220             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
 221                 goto nla_put_failure;
 222         if (vlan->flags) {
 223                 f.flags = vlan->flags;
 224                 f.mask  = ~0;
 225                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 226                         goto nla_put_failure;
 227         }
 228         if (vlan->nr_ingress_mappings) {
 229                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 230                 if (nest == NULL)
 231                         goto nla_put_failure;
 232
 233                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 234                         if (!vlan->ingress_priority_map[i])
 235                                 continue;
 236
 237                         m.from = i;
 238                         m.to   = vlan->ingress_priority_map[i];
 239                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 240                                     sizeof(m), &m))
 241                                 goto nla_put_failure;
 242                 }
 243                 nla_nest_end(skb, nest);
 244         }
 245
 246         if (vlan->nr_egress_mappings) {
 247                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 248                 if (nest == NULL)
 249                         goto nla_put_failure;
 250
 251                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 252                         for (pm = vlan->egress_priority_map[i]; pm;
 253                              pm = pm->next) {
 254                                 if (!pm->vlan_qos)
 255                                         continue;
 256
 257                                 m.from = pm->priority;
 258                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 259                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 260                                             sizeof(m), &m))
 261                                         goto nla_put_failure;
 262                         }
 263                 }
 264                 nla_nest_end(skb, nest);
 265         }
 266         return 0;
 267
 268 nla_put_failure:
 269         return -EMSGSIZE;
 270 }
 271
 272 static struct net *vlan_get_link_net(const struct net_device *dev)
 273 {
 274         struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
 275
 276         return dev_net(real_dev);
 277 }
 278
 279 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 280         .kind           = "vlan",
 281         .maxtype        = IFLA_VLAN_MAX,
 282         .policy         = vlan_policy,
 283         .priv_size      = sizeof(struct vlan_dev_priv),
 284         .setup          = vlan_setup,
 285         .validate       = vlan_validate,
 286         .newlink        = vlan_newlink,
 287         .changelink     = vlan_changelink,
 288         .dellink        = unregister_vlan_dev,
 289         .get_size       = vlan_get_size,
 290         .fill_info      = vlan_fill_info,
 291         .get_link_net   = vlan_get_link_net,
 292 };
 293
 294 int __init vlan_netlink_init(void)
 295 {
 296         return rtnl_link_register(&vlan_link_ops);
 297 }
 298
 299 void __exit vlan_netlink_fini(void)
 300 {
 301         rtnl_link_unregister(&vlan_link_ops);
 302 }
 303
 304 MODULE_ALIAS_RTNL_LINK("vlan");