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 <net/net_namespace.h>
  15 #include <net/netlink.h>
  16 #include <net/rtnetlink.h>
  17 #include "vlan.h"
  18
  19
  20 static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
  21         [IFLA_VLAN_ID]          = { .type = NLA_U16 },
  22         [IFLA_VLAN_FLAGS]       = { .len = sizeof(struct ifla_vlan_flags) },
  23         [IFLA_VLAN_EGRESS_QOS]  = { .type = NLA_NESTED },
  24         [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
  25 };
  26
  27 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
  28         [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
  29 };
  30
  31
  32 static inline int vlan_validate_qos_map(struct nlattr *attr)
  33 {
  34         if (!attr)
  35                 return 0;
  36         return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
  37 }
  38
  39 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
  40 {
  41         struct ifla_vlan_flags *flags;
  42         u16 id;
  43         int err;
  44
  45         if (tb[IFLA_ADDRESS]) {
  46                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
  47                         return -EINVAL;
  48                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
  49                         return -EADDRNOTAVAIL;
  50         }
  51
  52         if (!data)
  53                 return -EINVAL;
  54
  55         if (data[IFLA_VLAN_ID]) {
  56                 id = nla_get_u16(data[IFLA_VLAN_ID]);
  57                 if (id >= VLAN_VID_MASK)
  58                         return -ERANGE;
  59         }
  60         if (data[IFLA_VLAN_FLAGS]) {
  61                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  62                 if ((flags->flags & flags->mask) &
  63                     ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP))
  64                         return -EINVAL;
  65         }
  66
  67         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
  68         if (err < 0)
  69                 return err;
  70         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
  71         if (err < 0)
  72                 return err;
  73         return 0;
  74 }
  75
  76 static int vlan_changelink(struct net_device *dev,
  77                            struct nlattr *tb[], struct nlattr *data[])
  78 {
  79         struct ifla_vlan_flags *flags;
  80         struct ifla_vlan_qos_mapping *m;
  81         struct nlattr *attr;
  82         int rem;
  83
  84         if (data[IFLA_VLAN_FLAGS]) {
  85                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  86                 vlan_dev_change_flags(dev, flags->flags, flags->mask);
  87         }
  88         if (data[IFLA_VLAN_INGRESS_QOS]) {
  89                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
  90                         m = nla_data(attr);
  91                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
  92                 }
  93         }
  94         if (data[IFLA_VLAN_EGRESS_QOS]) {
  95                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
  96                         m = nla_data(attr);
  97                         vlan_dev_set_egress_priority(dev, m->from, m->to);
  98                 }
  99         }
 100         return 0;
 101 }
 102
 103 static int vlan_newlink(struct net_device *dev,
 104                         struct nlattr *tb[], struct nlattr *data[])
 105 {
 106         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 107         struct net_device *real_dev;
 108         int err;
 109
 110         if (!data[IFLA_VLAN_ID])
 111                 return -EINVAL;
 112
 113         if (!tb[IFLA_LINK])
 114                 return -EINVAL;
 115         real_dev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
 116         if (!real_dev)
 117                 return -ENODEV;
 118
 119         vlan->vlan_id  = nla_get_u16(data[IFLA_VLAN_ID]);
 120         vlan->real_dev = real_dev;
 121         vlan->flags    = VLAN_FLAG_REORDER_HDR;
 122
 123         err = vlan_check_real_dev(real_dev, vlan->vlan_id);
 124         if (err < 0)
 125                 return err;
 126
 127         if (!tb[IFLA_MTU])
 128                 dev->mtu = real_dev->mtu;
 129         else if (dev->mtu > real_dev->mtu)
 130                 return -EINVAL;
 131
 132         err = vlan_changelink(dev, tb, data);
 133         if (err < 0)
 134                 return err;
 135
 136         return register_vlan_dev(dev);
 137 }
 138
 139 static inline size_t vlan_qos_map_size(unsigned int n)
 140 {
 141         if (n == 0)
 142                 return 0;
 143         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 144         return nla_total_size(sizeof(struct nlattr)) +
 145                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 146 }
 147
 148 static size_t vlan_get_size(const struct net_device *dev)
 149 {
 150         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 151
 152         return nla_total_size(2) +      /* IFLA_VLAN_ID */
 153                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 154                vlan_qos_map_size(vlan->nr_egress_mappings);
 155 }
 156
 157 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 158 {
 159         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 160         struct vlan_priority_tci_mapping *pm;
 161         struct ifla_vlan_flags f;
 162         struct ifla_vlan_qos_mapping m;
 163         struct nlattr *nest;
 164         unsigned int i;
 165
 166         NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
 167         if (vlan->flags) {
 168                 f.flags = vlan->flags;
 169                 f.mask  = ~0;
 170                 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
 171         }
 172         if (vlan->nr_ingress_mappings) {
 173                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 174                 if (nest == NULL)
 175                         goto nla_put_failure;
 176
 177                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 178                         if (!vlan->ingress_priority_map[i])
 179                                 continue;
 180
 181                         m.from = i;
 182                         m.to   = vlan->ingress_priority_map[i];
 183                         NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 184                                 sizeof(m), &m);
 185                 }
 186                 nla_nest_end(skb, nest);
 187         }
 188
 189         if (vlan->nr_egress_mappings) {
 190                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 191                 if (nest == NULL)
 192                         goto nla_put_failure;
 193
 194                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 195                         for (pm = vlan->egress_priority_map[i]; pm;
 196                              pm = pm->next) {
 197                                 if (!pm->vlan_qos)
 198                                         continue;
 199
 200                                 m.from = pm->priority;
 201                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 202                                 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 203                                         sizeof(m), &m);
 204                         }
 205                 }
 206                 nla_nest_end(skb, nest);
 207         }
 208         return 0;
 209
 210 nla_put_failure:
 211         return -EMSGSIZE;
 212 }
 213
 214 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 215         .kind           = "vlan",
 216         .maxtype        = IFLA_VLAN_MAX,
 217         .policy         = vlan_policy,
 218         .priv_size      = sizeof(struct vlan_dev_info),
 219         .setup          = vlan_setup,
 220         .validate       = vlan_validate,
 221         .newlink        = vlan_newlink,
 222         .changelink     = vlan_changelink,
 223         .dellink        = unregister_vlan_dev,
 224         .get_size       = vlan_get_size,
 225         .fill_info      = vlan_fill_info,
 226 };
 227
 228 int __init vlan_netlink_init(void)
 229 {
 230         return rtnl_link_register(&vlan_link_ops);
 231 }
 232
 233 void __exit vlan_netlink_fini(void)
 234 {
 235         rtnl_link_unregister(&vlan_link_ops);
 236 }
 237
 238 MODULE_ALIAS_RTNL_LINK("vlan");