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 }
  40
  41 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
  42 {
  43         struct ifla_vlan_flags *flags;
  44         u16 id;
  45         int err;
  46
  47         if (tb[IFLA_ADDRESS]) {
  48                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
  49                         return -EINVAL;
  50                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
  51                         return -EADDRNOTAVAIL;
  52         }
  53
  54         if (!data)
  55                 return -EINVAL;
  56
  57         if (data[IFLA_VLAN_PROTOCOL]) {
  58                 switch (nla_get_be16(data[IFLA_VLAN_PROTOCOL])) {
  59                 case __constant_htons(ETH_P_8021Q):
  60                 case __constant_htons(ETH_P_8021AD):
  61                         break;
  62                 default:
  63                         return -EPROTONOSUPPORT;
  64                 }
  65         }
  66
  67         if (data[IFLA_VLAN_ID]) {
  68                 id = nla_get_u16(data[IFLA_VLAN_ID]);
  69                 if (id >= VLAN_VID_MASK)
  70                         return -ERANGE;
  71         }
  72         if (data[IFLA_VLAN_FLAGS]) {
  73                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  74                 if ((flags->flags & flags->mask) &
  75                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
  76                       VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
  77                         return -EINVAL;
  78         }
  79
  80         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
  81         if (err < 0)
  82                 return err;
  83         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
  84         if (err < 0)
  85                 return err;
  86         return 0;
  87 }
  88
  89 static int vlan_changelink(struct net_device *dev,
  90                            struct nlattr *tb[], struct nlattr *data[])
  91 {
  92         struct ifla_vlan_flags *flags;
  93         struct ifla_vlan_qos_mapping *m;
  94         struct nlattr *attr;
  95         int rem;
  96
  97         if (data[IFLA_VLAN_FLAGS]) {
  98                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  99                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
 100         }
 101         if (data[IFLA_VLAN_INGRESS_QOS]) {
 102                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
 103                         m = nla_data(attr);
 104                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
 105                 }
 106         }
 107         if (data[IFLA_VLAN_EGRESS_QOS]) {
 108                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
 109                         m = nla_data(attr);
 110                         vlan_dev_set_egress_priority(dev, m->from, m->to);
 111                 }
 112         }
 113         return 0;
 114 }
 115
 116 static int vlan_newlink(struct net *src_net, struct net_device *dev,
 117                         struct nlattr *tb[], struct nlattr *data[])
 118 {
 119         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 120         struct net_device *real_dev;
 121         __be16 proto;
 122         int err;
 123
 124         if (!data[IFLA_VLAN_ID])
 125                 return -EINVAL;
 126
 127         if (!tb[IFLA_LINK])
 128                 return -EINVAL;
 129         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 130         if (!real_dev)
 131                 return -ENODEV;
 132
 133         if (data[IFLA_VLAN_PROTOCOL])
 134                 proto = nla_get_be16(data[IFLA_VLAN_PROTOCOL]);
 135         else
 136                 proto = htons(ETH_P_8021Q);
 137
 138         vlan->vlan_proto = proto;
 139         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
 140         vlan->real_dev   = real_dev;
 141         vlan->flags      = VLAN_FLAG_REORDER_HDR;
 142
 143         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
 144         if (err < 0)
 145                 return err;
 146
 147         if (!tb[IFLA_MTU])
 148                 dev->mtu = real_dev->mtu;
 149         else if (dev->mtu > real_dev->mtu)
 150                 return -EINVAL;
 151
 152         err = vlan_changelink(dev, tb, data);
 153         if (err < 0)
 154                 return err;
 155
 156         return register_vlan_dev(dev);
 157 }
 158
 159 static inline size_t vlan_qos_map_size(unsigned int n)
 160 {
 161         if (n == 0)
 162                 return 0;
 163         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 164         return nla_total_size(sizeof(struct nlattr)) +
 165                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 166 }
 167
 168 static size_t vlan_get_size(const struct net_device *dev)
 169 {
 170         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 171
 172         return nla_total_size(2) +      /* IFLA_VLAN_PROTOCOL */
 173                nla_total_size(2) +      /* IFLA_VLAN_ID */
 174                nla_total_size(sizeof(struct ifla_vlan_flags)) + /* IFLA_VLAN_FLAGS */
 175                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 176                vlan_qos_map_size(vlan->nr_egress_mappings);
 177 }
 178
 179 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 180 {
 181         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 182         struct vlan_priority_tci_mapping *pm;
 183         struct ifla_vlan_flags f;
 184         struct ifla_vlan_qos_mapping m;
 185         struct nlattr *nest;
 186         unsigned int i;
 187
 188         if (nla_put_be16(skb, IFLA_VLAN_PROTOCOL, vlan->vlan_proto) ||
 189             nla_put_u16(skb, IFLA_VLAN_ID, vlan->vlan_id))
 190                 goto nla_put_failure;
 191         if (vlan->flags) {
 192                 f.flags = vlan->flags;
 193                 f.mask  = ~0;
 194                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 195                         goto nla_put_failure;
 196         }
 197         if (vlan->nr_ingress_mappings) {
 198                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 199                 if (nest == NULL)
 200                         goto nla_put_failure;
 201
 202                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 203                         if (!vlan->ingress_priority_map[i])
 204                                 continue;
 205
 206                         m.from = i;
 207                         m.to   = vlan->ingress_priority_map[i];
 208                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 209                                     sizeof(m), &m))
 210                                 goto nla_put_failure;
 211                 }
 212                 nla_nest_end(skb, nest);
 213         }
 214
 215         if (vlan->nr_egress_mappings) {
 216                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 217                 if (nest == NULL)
 218                         goto nla_put_failure;
 219
 220                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 221                         for (pm = vlan->egress_priority_map[i]; pm;
 222                              pm = pm->next) {
 223                                 if (!pm->vlan_qos)
 224                                         continue;
 225
 226                                 m.from = pm->priority;
 227                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 228                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 229                                             sizeof(m), &m))
 230                                         goto nla_put_failure;
 231                         }
 232                 }
 233                 nla_nest_end(skb, nest);
 234         }
 235         return 0;
 236
 237 nla_put_failure:
 238         return -EMSGSIZE;
 239 }
 240
 241 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 242         .kind           = "vlan",
 243         .maxtype        = IFLA_VLAN_MAX,
 244         .policy         = vlan_policy,
 245         .priv_size      = sizeof(struct vlan_dev_priv),
 246         .setup          = vlan_setup,
 247         .validate       = vlan_validate,
 248         .newlink        = vlan_newlink,
 249         .changelink     = vlan_changelink,
 250         .dellink        = unregister_vlan_dev,
 251         .get_size       = vlan_get_size,
 252         .fill_info      = vlan_fill_info,
 253 };
 254
 255 int __init vlan_netlink_init(void)
 256 {
 257         return rtnl_link_register(&vlan_link_ops);
 258 }
 259
 260 void __exit vlan_netlink_fini(void)
 261 {
 262         rtnl_link_unregister(&vlan_link_ops);
 263 }
 264
 265 MODULE_ALIAS_RTNL_LINK("vlan");