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