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/netlink.h>
  15 #include <net/rtnetlink.h>
  16 #include "vlan.h"
  17
  18
  19 static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
  20         [IFLA_VLAN_ID]          = { .type = NLA_U16 },
  21         [IFLA_VLAN_FLAGS]       = { .len = sizeof(struct ifla_vlan_flags) },
  22         [IFLA_VLAN_EGRESS_QOS]  = { .type = NLA_NESTED },
  23         [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
  24 };
  25
  26 static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
  27         [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
  28 };
  29
  30
  31 static inline int vlan_validate_qos_map(struct nlattr *attr)
  32 {
  33         if (!attr)
  34                 return 0;
  35         return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
  36 }
  37
  38 static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
  39 {
  40         struct ifla_vlan_flags *flags;
  41         u16 id;
  42         int err;
  43
  44         if (tb[IFLA_ADDRESS]) {
  45                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
  46                         return -EINVAL;
  47                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
  48                         return -EADDRNOTAVAIL;
  49         }
  50
  51         if (!data)
  52                 return -EINVAL;
  53
  54         if (data[IFLA_VLAN_ID]) {
  55                 id = nla_get_u16(data[IFLA_VLAN_ID]);
  56                 if (id >= VLAN_VID_MASK)
  57                         return -ERANGE;
  58         }
  59         if (data[IFLA_VLAN_FLAGS]) {
  60                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  61                 if ((flags->flags & flags->mask) & ~VLAN_FLAG_REORDER_HDR)
  62                         return -EINVAL;
  63         }
  64
  65         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
  66         if (err < 0)
  67                 return err;
  68         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
  69         if (err < 0)
  70                 return err;
  71         return 0;
  72 }
  73
  74 static int vlan_changelink(struct net_device *dev,
  75                            struct nlattr *tb[], struct nlattr *data[])
  76 {
  77         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
  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->flags = (vlan->flags & ~flags->mask) |
  86                               (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(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 void vlan_dellink(struct net_device *dev)
 140 {
 141         unregister_vlan_device(dev);
 142 }
 143
 144 static inline size_t vlan_qos_map_size(unsigned int n)
 145 {
 146         if (n == 0)
 147                 return 0;
 148         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 149         return nla_total_size(sizeof(struct nlattr)) +
 150                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 151 }
 152
 153 static size_t vlan_get_size(const struct net_device *dev)
 154 {
 155         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 156
 157         return nla_total_size(2) +      /* IFLA_VLAN_ID */
 158                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 159                vlan_qos_map_size(vlan->nr_egress_mappings);
 160 }
 161
 162 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 163 {
 164         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 165         struct vlan_priority_tci_mapping *pm;
 166         struct ifla_vlan_flags f;
 167         struct ifla_vlan_qos_mapping m;
 168         struct nlattr *nest;
 169         unsigned int i;
 170
 171         NLA_PUT_U16(skb, IFLA_VLAN_ID, VLAN_DEV_INFO(dev)->vlan_id);
 172         if (vlan->flags) {
 173                 f.flags = vlan->flags;
 174                 f.mask  = ~0;
 175                 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
 176         }
 177         if (vlan->nr_ingress_mappings) {
 178                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 179                 if (nest == NULL)
 180                         goto nla_put_failure;
 181
 182                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 183                         if (!vlan->ingress_priority_map[i])
 184                                 continue;
 185
 186                         m.from = i;
 187                         m.to   = vlan->ingress_priority_map[i];
 188                         NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 189                                 sizeof(m), &m);
 190                 }
 191                 nla_nest_end(skb, nest);
 192         }
 193
 194         if (vlan->nr_egress_mappings) {
 195                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 196                 if (nest == NULL)
 197                         goto nla_put_failure;
 198
 199                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 200                         for (pm = vlan->egress_priority_map[i]; pm;
 201                              pm = pm->next) {
 202                                 if (!pm->vlan_qos)
 203                                         continue;
 204
 205                                 m.from = pm->priority;
 206                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 207                                 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 208                                         sizeof(m), &m);
 209                         }
 210                 }
 211                 nla_nest_end(skb, nest);
 212         }
 213         return 0;
 214
 215 nla_put_failure:
 216         return -EMSGSIZE;
 217 }
 218
 219 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 220         .kind           = "vlan",
 221         .maxtype        = IFLA_VLAN_MAX,
 222         .policy         = vlan_policy,
 223         .priv_size      = sizeof(struct vlan_dev_info),
 224         .setup          = vlan_setup,
 225         .validate       = vlan_validate,
 226         .newlink        = vlan_newlink,
 227         .changelink     = vlan_changelink,
 228         .dellink        = vlan_dellink,
 229         .get_size       = vlan_get_size,
 230         .fill_info      = vlan_fill_info,
 231 };
 232
 233 int __init vlan_netlink_init(void)
 234 {
 235         return rtnl_link_register(&vlan_link_ops);
 236 }
 237
 238 void __exit vlan_netlink_fini(void)
 239 {
 240         rtnl_link_unregister(&vlan_link_ops);
 241 }
 242
 243 MODULE_ALIAS_RTNL_LINK("vlan");