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 vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
  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->flags = (vlan->flags & ~flags->mask) |
  87                               (flags->flags & flags->mask);
  88         }
  89         if (data[IFLA_VLAN_INGRESS_QOS]) {
  90                 nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
  91                         m = nla_data(attr);
  92                         vlan_dev_set_ingress_priority(dev, m->to, m->from);
  93                 }
  94         }
  95         if (data[IFLA_VLAN_EGRESS_QOS]) {
  96                 nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
  97                         m = nla_data(attr);
  98                         vlan_dev_set_egress_priority(dev, m->from, m->to);
  99                 }
 100         }
 101         return 0;
 102 }
 103
 104 static int vlan_newlink(struct net_device *dev,
 105                         struct nlattr *tb[], struct nlattr *data[])
 106 {
 107         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 108         struct net_device *real_dev;
 109         int err;
 110
 111         if (!data[IFLA_VLAN_ID])
 112                 return -EINVAL;
 113
 114         if (!tb[IFLA_LINK])
 115                 return -EINVAL;
 116         real_dev = __dev_get_by_index(&init_net, nla_get_u32(tb[IFLA_LINK]));
 117         if (!real_dev)
 118                 return -ENODEV;
 119
 120         vlan->vlan_id  = nla_get_u16(data[IFLA_VLAN_ID]);
 121         vlan->real_dev = real_dev;
 122         vlan->flags    = VLAN_FLAG_REORDER_HDR;
 123
 124         err = vlan_check_real_dev(real_dev, vlan->vlan_id);
 125         if (err < 0)
 126                 return err;
 127
 128         if (!tb[IFLA_MTU])
 129                 dev->mtu = real_dev->mtu;
 130         else if (dev->mtu > real_dev->mtu)
 131                 return -EINVAL;
 132
 133         err = vlan_changelink(dev, tb, data);
 134         if (err < 0)
 135                 return err;
 136
 137         return register_vlan_dev(dev);
 138 }
 139
 140 static void vlan_dellink(struct net_device *dev)
 141 {
 142         unregister_vlan_device(dev);
 143 }
 144
 145 static inline size_t vlan_qos_map_size(unsigned int n)
 146 {
 147         if (n == 0)
 148                 return 0;
 149         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 150         return nla_total_size(sizeof(struct nlattr)) +
 151                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 152 }
 153
 154 static size_t vlan_get_size(const struct net_device *dev)
 155 {
 156         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 157
 158         return nla_total_size(2) +      /* IFLA_VLAN_ID */
 159                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 160                vlan_qos_map_size(vlan->nr_egress_mappings);
 161 }
 162
 163 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 164 {
 165         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 166         struct vlan_priority_tci_mapping *pm;
 167         struct ifla_vlan_flags f;
 168         struct ifla_vlan_qos_mapping m;
 169         struct nlattr *nest;
 170         unsigned int i;
 171
 172         NLA_PUT_U16(skb, IFLA_VLAN_ID, VLAN_DEV_INFO(dev)->vlan_id);
 173         if (vlan->flags) {
 174                 f.flags = vlan->flags;
 175                 f.mask  = ~0;
 176                 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
 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                         NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 190                                 sizeof(m), &m);
 191                 }
 192                 nla_nest_end(skb, nest);
 193         }
 194
 195         if (vlan->nr_egress_mappings) {
 196                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 197                 if (nest == NULL)
 198                         goto nla_put_failure;
 199
 200                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 201                         for (pm = vlan->egress_priority_map[i]; pm;
 202                              pm = pm->next) {
 203                                 if (!pm->vlan_qos)
 204                                         continue;
 205
 206                                 m.from = pm->priority;
 207                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 208                                 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 209                                         sizeof(m), &m);
 210                         }
 211                 }
 212                 nla_nest_end(skb, nest);
 213         }
 214         return 0;
 215
 216 nla_put_failure:
 217         return -EMSGSIZE;
 218 }
 219
 220 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 221         .kind           = "vlan",
 222         .maxtype        = IFLA_VLAN_MAX,
 223         .policy         = vlan_policy,
 224         .priv_size      = sizeof(struct vlan_dev_info),
 225         .setup          = vlan_setup,
 226         .validate       = vlan_validate,
 227         .newlink        = vlan_newlink,
 228         .changelink     = vlan_changelink,
 229         .dellink        = vlan_dellink,
 230         .get_size       = vlan_get_size,
 231         .fill_info      = vlan_fill_info,
 232 };
 233
 234 int __init vlan_netlink_init(void)
 235 {
 236         return rtnl_link_register(&vlan_link_ops);
 237 }
 238
 239 void __exit vlan_netlink_fini(void)
 240 {
 241         rtnl_link_unregister(&vlan_link_ops);
 242 }
 243
 244 MODULE_ALIAS_RTNL_LINK("vlan");