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                       VLAN_FLAG_LOOSE_BINDING))
  65                         return -EINVAL;
  66         }
  67
  68         err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
  69         if (err < 0)
  70                 return err;
  71         err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
  72         if (err < 0)
  73                 return err;
  74         return 0;
  75 }
  76
  77 static int vlan_changelink(struct net_device *dev,
  78                            struct nlattr *tb[], struct nlattr *data[])
  79 {
  80         struct ifla_vlan_flags *flags;
  81         struct ifla_vlan_qos_mapping *m;
  82         struct nlattr *attr;
  83         int rem;
  84
  85         if (data[IFLA_VLAN_FLAGS]) {
  86                 flags = nla_data(data[IFLA_VLAN_FLAGS]);
  87                 vlan_dev_change_flags(dev, 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_get_tx_queues(struct net *net,
 105                               struct nlattr *tb[],
 106                               unsigned int *num_tx_queues,
 107                               unsigned int *real_num_tx_queues)
 108 {
 109         struct net_device *real_dev;
 110
 111         if (!tb[IFLA_LINK])
 112                 return -EINVAL;
 113
 114         real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
 115         if (!real_dev)
 116                 return -ENODEV;
 117
 118         *num_tx_queues      = real_dev->num_tx_queues;
 119         *real_num_tx_queues = real_dev->real_num_tx_queues;
 120         return 0;
 121 }
 122
 123 static int vlan_newlink(struct net *src_net, struct net_device *dev,
 124                         struct nlattr *tb[], struct nlattr *data[])
 125 {
 126         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 127         struct net_device *real_dev;
 128         int err;
 129
 130         if (!data[IFLA_VLAN_ID])
 131                 return -EINVAL;
 132
 133         if (!tb[IFLA_LINK])
 134                 return -EINVAL;
 135         real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 136         if (!real_dev)
 137                 return -ENODEV;
 138
 139         vlan->vlan_id  = nla_get_u16(data[IFLA_VLAN_ID]);
 140         vlan->real_dev = real_dev;
 141         vlan->flags    = VLAN_FLAG_REORDER_HDR;
 142
 143         err = vlan_check_real_dev(real_dev, vlan->vlan_id);
 144         if (err < 0)
 145                 return err;
 146
 147         if (!tb[IFLA_MTU])
 148                 dev->mtu = real_dev->mtu;
 149         else if (dev->mtu > real_dev->mtu)
 150                 return -EINVAL;
 151
 152         err = vlan_changelink(dev, tb, data);
 153         if (err < 0)
 154                 return err;
 155
 156         return register_vlan_dev(dev);
 157 }
 158
 159 static inline size_t vlan_qos_map_size(unsigned int n)
 160 {
 161         if (n == 0)
 162                 return 0;
 163         /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 164         return nla_total_size(sizeof(struct nlattr)) +
 165                nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 166 }
 167
 168 static size_t vlan_get_size(const struct net_device *dev)
 169 {
 170         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 171
 172         return nla_total_size(2) +      /* IFLA_VLAN_ID */
 173                sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
 174                vlan_qos_map_size(vlan->nr_ingress_mappings) +
 175                vlan_qos_map_size(vlan->nr_egress_mappings);
 176 }
 177
 178 static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 179 {
 180         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 181         struct vlan_priority_tci_mapping *pm;
 182         struct ifla_vlan_flags f;
 183         struct ifla_vlan_qos_mapping m;
 184         struct nlattr *nest;
 185         unsigned int i;
 186
 187         NLA_PUT_U16(skb, IFLA_VLAN_ID, vlan_dev_info(dev)->vlan_id);
 188         if (vlan->flags) {
 189                 f.flags = vlan->flags;
 190                 f.mask  = ~0;
 191                 NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
 192         }
 193         if (vlan->nr_ingress_mappings) {
 194                 nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
 195                 if (nest == NULL)
 196                         goto nla_put_failure;
 197
 198                 for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
 199                         if (!vlan->ingress_priority_map[i])
 200                                 continue;
 201
 202                         m.from = i;
 203                         m.to   = vlan->ingress_priority_map[i];
 204                         NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 205                                 sizeof(m), &m);
 206                 }
 207                 nla_nest_end(skb, nest);
 208         }
 209
 210         if (vlan->nr_egress_mappings) {
 211                 nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
 212                 if (nest == NULL)
 213                         goto nla_put_failure;
 214
 215                 for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
 216                         for (pm = vlan->egress_priority_map[i]; pm;
 217                              pm = pm->next) {
 218                                 if (!pm->vlan_qos)
 219                                         continue;
 220
 221                                 m.from = pm->priority;
 222                                 m.to   = (pm->vlan_qos >> 13) & 0x7;
 223                                 NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
 224                                         sizeof(m), &m);
 225                         }
 226                 }
 227                 nla_nest_end(skb, nest);
 228         }
 229         return 0;
 230
 231 nla_put_failure:
 232         return -EMSGSIZE;
 233 }
 234
 235 struct rtnl_link_ops vlan_link_ops __read_mostly = {
 236         .kind           = "vlan",
 237         .maxtype        = IFLA_VLAN_MAX,
 238         .policy         = vlan_policy,
 239         .priv_size      = sizeof(struct vlan_dev_info),
 240         .get_tx_queues  = vlan_get_tx_queues,
 241         .setup          = vlan_setup,
 242         .validate       = vlan_validate,
 243         .newlink        = vlan_newlink,
 244         .changelink     = vlan_changelink,
 245         .dellink        = unregister_vlan_dev,
 246         .get_size       = vlan_get_size,
 247         .fill_info      = vlan_fill_info,
 248 };
 249
 250 int __init vlan_netlink_init(void)
 251 {
 252         return rtnl_link_register(&vlan_link_ops);
 253 }
 254
 255 void __exit vlan_netlink_fini(void)
 256 {
 257         rtnl_link_unregister(&vlan_link_ops);
 258 }
 259
 260 MODULE_ALIAS_RTNL_LINK("vlan");