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