linux/net/8021q/vlan_netlink.c
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   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 <linux/module.h>
  15#include <net/net_namespace.h>
  16#include <net/netlink.h>
  17#include <net/rtnetlink.h>
  18#include "vlan.h"
  19
  20
  21static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
  22        [IFLA_VLAN_ID]          = { .type = NLA_U16 },
  23        [IFLA_VLAN_FLAGS]       = { .len = sizeof(struct ifla_vlan_flags) },
  24        [IFLA_VLAN_EGRESS_QOS]  = { .type = NLA_NESTED },
  25        [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
  26};
  27
  28static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
  29        [IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
  30};
  31
  32
  33static inline int vlan_validate_qos_map(struct nlattr *attr)
  34{
  35        if (!attr)
  36                return 0;
  37        return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
  38}
  39
  40static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
  41{
  42        struct ifla_vlan_flags *flags;
  43        u16 id;
  44        int err;
  45
  46        if (tb[IFLA_ADDRESS]) {
  47                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
  48                        return -EINVAL;
  49                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
  50                        return -EADDRNOTAVAIL;
  51        }
  52
  53        if (!data)
  54                return -EINVAL;
  55
  56        if (data[IFLA_VLAN_ID]) {
  57                id = nla_get_u16(data[IFLA_VLAN_ID]);
  58                if (id >= VLAN_VID_MASK)
  59                        return -ERANGE;
  60        }
  61        if (data[IFLA_VLAN_FLAGS]) {
  62                flags = nla_data(data[IFLA_VLAN_FLAGS]);
  63                if ((flags->flags & flags->mask) &
  64                    ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP |
  65                      VLAN_FLAG_LOOSE_BINDING | VLAN_FLAG_MVRP))
  66                        return -EINVAL;
  67        }
  68
  69        err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
  70        if (err < 0)
  71                return err;
  72        err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
  73        if (err < 0)
  74                return err;
  75        return 0;
  76}
  77
  78static int vlan_changelink(struct net_device *dev,
  79                           struct nlattr *tb[], struct nlattr *data[])
  80{
  81        struct ifla_vlan_flags *flags;
  82        struct ifla_vlan_qos_mapping *m;
  83        struct nlattr *attr;
  84        int rem;
  85
  86        if (data[IFLA_VLAN_FLAGS]) {
  87                flags = nla_data(data[IFLA_VLAN_FLAGS]);
  88                vlan_dev_change_flags(dev, flags->flags, flags->mask);
  89        }
  90        if (data[IFLA_VLAN_INGRESS_QOS]) {
  91                nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
  92                        m = nla_data(attr);
  93                        vlan_dev_set_ingress_priority(dev, m->to, m->from);
  94                }
  95        }
  96        if (data[IFLA_VLAN_EGRESS_QOS]) {
  97                nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
  98                        m = nla_data(attr);
  99                        vlan_dev_set_egress_priority(dev, m->from, m->to);
 100                }
 101        }
 102        return 0;
 103}
 104
 105static int vlan_newlink(struct net *src_net, struct net_device *dev,
 106                        struct nlattr *tb[], struct nlattr *data[])
 107{
 108        struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 109        struct net_device *real_dev;
 110        int err;
 111
 112        if (!data[IFLA_VLAN_ID])
 113                return -EINVAL;
 114
 115        if (!tb[IFLA_LINK])
 116                return -EINVAL;
 117        real_dev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
 118        if (!real_dev)
 119                return -ENODEV;
 120
 121        vlan->vlan_id  = nla_get_u16(data[IFLA_VLAN_ID]);
 122        vlan->real_dev = real_dev;
 123        vlan->flags    = VLAN_FLAG_REORDER_HDR;
 124
 125        err = vlan_check_real_dev(real_dev, vlan->vlan_id);
 126        if (err < 0)
 127                return err;
 128
 129        if (!tb[IFLA_MTU])
 130                dev->mtu = real_dev->mtu;
 131        else if (dev->mtu > real_dev->mtu)
 132                return -EINVAL;
 133
 134        err = vlan_changelink(dev, tb, data);
 135        if (err < 0)
 136                return err;
 137
 138        return register_vlan_dev(dev);
 139}
 140
 141static inline size_t vlan_qos_map_size(unsigned int n)
 142{
 143        if (n == 0)
 144                return 0;
 145        /* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
 146        return nla_total_size(sizeof(struct nlattr)) +
 147               nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
 148}
 149
 150static size_t vlan_get_size(const struct net_device *dev)
 151{
 152        struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 153
 154        return nla_total_size(2) +      /* IFLA_VLAN_ID */
 155               sizeof(struct ifla_vlan_flags) + /* IFLA_VLAN_FLAGS */
 156               vlan_qos_map_size(vlan->nr_ingress_mappings) +
 157               vlan_qos_map_size(vlan->nr_egress_mappings);
 158}
 159
 160static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
 161{
 162        struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 163        struct vlan_priority_tci_mapping *pm;
 164        struct ifla_vlan_flags f;
 165        struct ifla_vlan_qos_mapping m;
 166        struct nlattr *nest;
 167        unsigned int i;
 168
 169        if (nla_put_u16(skb, IFLA_VLAN_ID, vlan_dev_priv(dev)->vlan_id))
 170                goto nla_put_failure;
 171        if (vlan->flags) {
 172                f.flags = vlan->flags;
 173                f.mask  = ~0;
 174                if (nla_put(skb, IFLA_VLAN_FLAGS, sizeof(f), &f))
 175                        goto nla_put_failure;
 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                        if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 189                                    sizeof(m), &m))
 190                                goto nla_put_failure;
 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                                if (nla_put(skb, IFLA_VLAN_QOS_MAPPING,
 209                                            sizeof(m), &m))
 210                                        goto nla_put_failure;
 211                        }
 212                }
 213                nla_nest_end(skb, nest);
 214        }
 215        return 0;
 216
 217nla_put_failure:
 218        return -EMSGSIZE;
 219}
 220
 221struct rtnl_link_ops vlan_link_ops __read_mostly = {
 222        .kind           = "vlan",
 223        .maxtype        = IFLA_VLAN_MAX,
 224        .policy         = vlan_policy,
 225        .priv_size      = sizeof(struct vlan_dev_priv),
 226        .setup          = vlan_setup,
 227        .validate       = vlan_validate,
 228        .newlink        = vlan_newlink,
 229        .changelink     = vlan_changelink,
 230        .dellink        = unregister_vlan_dev,
 231        .get_size       = vlan_get_size,
 232        .fill_info      = vlan_fill_info,
 233};
 234
 235int __init vlan_netlink_init(void)
 236{
 237        return rtnl_link_register(&vlan_link_ops);
 238}
 239
 240void __exit vlan_netlink_fini(void)
 241{
 242        rtnl_link_unregister(&vlan_link_ops);
 243}
 244
 245MODULE_ALIAS_RTNL_LINK("vlan");
 246
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