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 };
  27
  28 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
  29         [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
  30 };
  31
  32
  33 static inline int vlan_validate_qos_map(struct nlattr *attr)
  34 {
  35         if (!attr)
  36                 return 0;
  37         return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
  38 }
  39
  40 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
  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                         return -EINVAL;
  49                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
  50                         return -EADDRNOTAVAIL;
  51         }
  52
  53         if (!data)
  54                 return -EINVAL;
  55
  56         if (data[IFLA_VLAN_ID]) {
  57                 id = nla_get_u16(data[IFLA_VLAN_ID]);
  58                 if (id >= VLAN_VID_MASK)
  59                         return -ERANGE;
  60         }
  61         if (data[IFLA_VLAN_FLAGS]) {
  62                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  63                 if ((flags->flags & flags->mask) &
  64                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
  65                       VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
  66                         return -EINVAL;
  67         }
  68
  69         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
  70         if (err < 0)
  71                 return err;
  72         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
  73         if (err < 0)
  74                 return err;
  75         return 0;
  76 }
  77
  78 static int vlan_changelink(struct net_device *dev,
  79                            struct nlattr *tb[], struct nlattr *data[])
  80 {
  81         struct ifla_vlan_flags *flags;
  82         struct ifla_vlan_qos_mapping *m;
  83         struct nlattr *attr;
  84         int rem;
  85
  86         if (data[IFLA_VLAN_FLAGS]) {
  87                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  88                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
  89         }
  90         if (data[IFLA_VLAN_INGRESS_QOS]) {
  91                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
  92                         m = nla_data(attr);
  93                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
  94                 }
  95         }
  96         if (data[IFLA_VLAN_EGRESS_QOS]) {
  97                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
  98                         m = nla_data(attr);
  99                         vlan_dev_set_egress_priority(dev, m->from, m->to);
 100                 }
 101         }
 102         return 0;
 103 }
 104
 105 static int vlan_newlink(struct net *src_net, struct net_device *dev,
 106                         struct nlattr *tb[], struct nlattr *data[])
 107 {
 108         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 109         struct net_device *real_dev;
 110         int err;
 111
 112         if (!data[IFLA_VLAN_ID])
 113                 return -EINVAL;
 114
 115         if (!tb[IFLA_LINK])
 116                 return -EINVAL;
 117         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 118         if (!real_dev)
 119                 return -ENODEV;
 120
 121         vlan->vlan_proto = htons(ETH_P_8021Q);
 122         vlan->vlan_id    = nla_get_u16(data[IFLA_VLAN_ID]);
 123         vlan->real_dev   = real_dev;
 124         vlan->flags      = VLAN_FLAG_REORDER_HDR;
 125
 126         err = vlan_check_real_dev(real_dev, vlan->vlan_proto, vlan->vlan_id);
 127         if (err < 0)
 128                 return err;
 129
 130         if (!tb[IFLA_MTU])
 131                 dev->mtu = real_dev->mtu;
 132         else if (dev->mtu > real_dev->mtu)
 133                 return -EINVAL;
 134
 135         err = vlan_changelink(dev, tb, data);
 136         if (err < 0)
 137                 return err;
 138
 139         return register_vlan_dev(dev);
 140 }
 141
 142 static inline size_t vlan_qos_map_size(unsigned int n)
 143 {
 144         if (n == 0)
 145                 return 0;
 146         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 147         return nla_total_size(sizeof(struct nlattr)) +
 148                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 149 }
 150
 151 static size_t vlan_get_size(const struct net_device *dev)
 152 {
 153         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 154
 155         return nla_total_size(2) +      /* IFLA_VLAN_ID */
 156                sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
 157                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 158                vlan_qos_map_size(vlan->nr_egress_mappings);
 159 }
 160
 161 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 162 {
 163         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 164         struct vlan_priority_tci_mapping *pm;
 165         struct ifla_vlan_flags f;
 166         struct ifla_vlan_qos_mapping m;
 167         struct nlattr *nest;
 168         unsigned int i;
 169
 170         if (nla_put_u16(skb, IFLA_VLAN_ID, vlan_dev_priv(dev)->vlan_id))
 171                 goto nla_put_failure;
 172         if (vlan->flags) {
 173                 f.flags = vlan->flags;
 174                 f.mask  = ~0;
 175                 if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 176                         goto nla_put_failure;
 177         }
 178         if (vlan->nr_ingress_mappings) {
 179                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 180                 if (nest == NULL)
 181                         goto nla_put_failure;
 182
 183                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 184                         if (!vlan->ingress_priority_map[i])
 185                                 continue;
 186
 187                         m.from = i;
 188                         m.to   = vlan->ingress_priority_map[i];
 189                         if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 190                                     sizeof(m), &m))
 191                                 goto nla_put_failure;
 192                 }
 193                 nla_nest_end(skb, nest);
 194         }
 195
 196         if (vlan->nr_egress_mappings) {
 197                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 198                 if (nest == NULL)
 199                         goto nla_put_failure;
 200
 201                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 202                         for (pm = vlan->egress_priority_map[i]; pm;
 203                              pm = pm->next) {
 204                                 if (!pm->vlan_qos)
 205                                         continue;
 206
 207                                 m.from = pm->priority;
 208                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 209                                 if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 210                                             sizeof(m), &m))
 211                                         goto nla_put_failure;
 212                         }
 213                 }
 214                 nla_nest_end(skb, nest);
 215         }
 216         return 0;
 217
 218 nla_put_failure:
 219         return -EMSGSIZE;
 220 }
 221
 222 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 223         .kind           = "vlan",
 224         .maxtype        = IFLA_VLAN_MAX,
 225         .policy         = vlan_policy,
 226         .priv_size      = sizeof(struct vlan_dev_priv),
 227         .setup          = vlan_setup,
 228         .validate       = vlan_validate,
 229         .newlink        = vlan_newlink,
 230         .changelink     = vlan_changelink,
 231         .dellink        = unregister_vlan_dev,
 232         .get_size       = vlan_get_size,
 233         .fill_info      = vlan_fill_info,
 234 };
 235
 236 int __init vlan_netlink_init(void)
 237 {
 238         return rtnl_link_register(&vlan_link_ops);
 239 }
 240
 241 void __exit vlan_netlink_fini(void)
 242 {
 243         rtnl_link_unregister(&vlan_link_ops);
 244 }
 245
 246 MODULE_ALIAS_RTNL_LINK("vlan");