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_get_tx_queues(struct net *net,
 104                               struct nlattr *tb[],
 105                               unsigned int *num_tx_queues,
 106                               unsigned int *real_num_tx_queues)
 107 {
 108         struct net_device *real_dev;
 109
 110         if (!tb[IFLA_LINK])
 111                 return -EINVAL;
 112
 113         real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
 114         if (!real_dev)
 115                 return -ENODEV;
 116
 117         *num_tx_queues      = real_dev->num_tx_queues;
 118         *real_num_tx_queues = real_dev->real_num_tx_queues;
 119         return 0;
 120 }
 121
 122 static int vlan_newlink(struct net_device *dev,
 123                         struct nlattr *tb[], struct nlattr *data[])
 124 {
 125         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 126         struct net_device *real_dev;
 127         int err;
 128
 129         if (!data[IFLA_VLAN_ID])
 130                 return -EINVAL;
 131
 132         if (!tb[IFLA_LINK])
 133                 return -EINVAL;
 134         real_dev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
 135         if (!real_dev)
 136                 return -ENODEV;
 137
 138         vlan->vlan_id  = nla_get_u16(data[IFLA_VLAN_ID]);
 139         vlan->real_dev = real_dev;
 140         vlan->flags    = VLAN_FLAG_REORDER_HDR;
 141
 142         err = vlan_check_real_dev(real_dev, vlan->vlan_id);
 143         if (err < 0)
 144                 return err;
 145
 146         if (!tb[IFLA_MTU])
 147                 dev->mtu = real_dev->mtu;
 148         else if (dev->mtu > real_dev->mtu)
 149                 return -EINVAL;
 150
 151         err = vlan_changelink(dev, tb, data);
 152         if (err < 0)
 153                 return err;
 154
 155         return register_vlan_dev(dev);
 156 }
 157
 158 static inline size_t vlan_qos_map_size(unsigned int n)
 159 {
 160         if (n == 0)
 161                 return 0;
 162         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 163         return nla_total_size(sizeof(struct nlattr)) +
 164                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 165 }
 166
 167 static size_t vlan_get_size(const struct net_device *dev)
 168 {
 169         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 170
 171         return nla_total_size(2) +      /* IFLA_VLAN_ID */
 172                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 173                vlan_qos_map_size(vlan->nr_egress_mappings);
 174 }
 175
 176 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 177 {
 178         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 179         struct vlan_priority_tci_mapping *pm;
 180         struct ifla_vlan_flags f;
 181         struct ifla_vlan_qos_mapping m;
 182         struct nlattr *nest;
 183         unsigned int i;
 184
 185         NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
 186         if (vlan->flags) {
 187                 f.flags = vlan->flags;
 188                 f.mask  = ~0;
 189                 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
 190         }
 191         if (vlan->nr_ingress_mappings) {
 192                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 193                 if (nest == NULL)
 194                         goto nla_put_failure;
 195
 196                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 197                         if (!vlan->ingress_priority_map[i])
 198                                 continue;
 199
 200                         m.from = i;
 201                         m.to   = vlan->ingress_priority_map[i];
 202                         NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 203                                 sizeof(m), &m);
 204                 }
 205                 nla_nest_end(skb, nest);
 206         }
 207
 208         if (vlan->nr_egress_mappings) {
 209                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 210                 if (nest == NULL)
 211                         goto nla_put_failure;
 212
 213                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 214                         for (pm = vlan->egress_priority_map[i]; pm;
 215                              pm = pm->next) {
 216                                 if (!pm->vlan_qos)
 217                                         continue;
 218
 219                                 m.from = pm->priority;
 220                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 221                                 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 222                                         sizeof(m), &m);
 223                         }
 224                 }
 225                 nla_nest_end(skb, nest);
 226         }
 227         return 0;
 228
 229 nla_put_failure:
 230         return -EMSGSIZE;
 231 }
 232
 233 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 234         .kind           = "vlan",
 235         .maxtype        = IFLA_VLAN_MAX,
 236         .policy         = vlan_policy,
 237         .priv_size      = sizeof(struct vlan_dev_info),
 238         .get_tx_queues  = vlan_get_tx_queues,
 239         .setup          = vlan_setup,
 240         .validate       = vlan_validate,
 241         .newlink        = vlan_newlink,
 242         .changelink     = vlan_changelink,
 243         .dellink        = unregister_vlan_dev,
 244         .get_size       = vlan_get_size,
 245         .fill_info      = vlan_fill_info,
 246 };
 247
 248 int __init vlan_netlink_init(void)
 249 {
 250         return rtnl_link_register(&vlan_link_ops);
 251 }
 252
 253 void __exit vlan_netlink_fini(void)
 254 {
 255         rtnl_link_unregister(&vlan_link_ops);
 256 }
 257
 258 MODULE_ALIAS_RTNL_LINK("vlan");