net/bridge/br_netlink.c

   1 /*
   2  *      Bridge netlink control interface
   3  *
   4  *      Authors:
   5  *      Stephen Hemminger               <shemminger@osdl.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/etherdevice.h>
  16 #include <net/rtnetlink.h>
  17 #include <net/net_namespace.h>
  18 #include <net/sock.h>
  19 #include <uapi/linux/if_bridge.h>
  20
  21 #include "br_private.h"
  22 #include "br_private_stp.h"
  23
  24 static inline size_t br_port_info_size(void)
  25 {
  26         return nla_total_size(1)        /* IFLA_BRPORT_STATE  */
  27                 + nla_total_size(2)     /* IFLA_BRPORT_PRIORITY */
  28                 + nla_total_size(4)     /* IFLA_BRPORT_COST */
  29                 + nla_total_size(1)     /* IFLA_BRPORT_MODE */
  30                 + nla_total_size(1)     /* IFLA_BRPORT_GUARD */
  31                 + nla_total_size(1)     /* IFLA_BRPORT_PROTECT */
  32                 + nla_total_size(1)     /* IFLA_BRPORT_FAST_LEAVE */
  33                 + nla_total_size(1)     /* IFLA_BRPORT_LEARNING */
  34                 + nla_total_size(1)     /* IFLA_BRPORT_UNICAST_FLOOD */
  35                 + 0;
  36 }
  37
  38 static inline size_t br_nlmsg_size(void)
  39 {
  40         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
  41                 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
  42                 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
  43                 + nla_total_size(4) /* IFLA_MASTER */
  44                 + nla_total_size(4) /* IFLA_MTU */
  45                 + nla_total_size(4) /* IFLA_LINK */
  46                 + nla_total_size(1) /* IFLA_OPERSTATE */
  47                 + nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
  48 }
  49
  50 static int br_port_fill_attrs(struct sk_buff *skb,
  51                               const struct net_bridge_port *p)
  52 {
  53         u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
  54
  55         if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
  56             nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
  57             nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
  58             nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
  59             nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
  60             nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
  61             nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
  62             nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
  63             nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
  64             nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)))
  65                 return -EMSGSIZE;
  66
  67         return 0;
  68 }
  69
  70 /*
  71  * Create one netlink message for one interface
  72  * Contains port and master info as well as carrier and bridge state.
  73  */
  74 static int br_fill_ifinfo(struct sk_buff *skb,
  75                           const struct net_bridge_port *port,
  76                           u32 pid, u32 seq, int event, unsigned int flags,
  77                           u32 filter_mask, const struct net_device *dev)
  78 {
  79         const struct net_bridge *br;
  80         struct ifinfomsg *hdr;
  81         struct nlmsghdr *nlh;
  82         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
  83
  84         if (port)
  85                 br = port->br;
  86         else
  87                 br = netdev_priv(dev);
  88
  89         br_debug(br, "br_fill_info event %d port %s master %s\n",
  90                      event, dev->name, br->dev->name);
  91
  92         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
  93         if (nlh == NULL)
  94                 return -EMSGSIZE;
  95
  96         hdr = nlmsg_data(nlh);
  97         hdr->ifi_family = AF_BRIDGE;
  98         hdr->__ifi_pad = 0;
  99         hdr->ifi_type = dev->type;
 100         hdr->ifi_index = dev->ifindex;
 101         hdr->ifi_flags = dev_get_flags(dev);
 102         hdr->ifi_change = 0;
 103
 104         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
 105             nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
 106             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 107             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
 108             (dev->addr_len &&
 109              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
 110             (dev->ifindex != dev->iflink &&
 111              nla_put_u32(skb, IFLA_LINK, dev->iflink)))
 112                 goto nla_put_failure;
 113
 114         if (event == RTM_NEWLINK && port) {
 115                 struct nlattr *nest
 116                         = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
 117
 118                 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
 119                         goto nla_put_failure;
 120                 nla_nest_end(skb, nest);
 121         }
 122
 123         /* Check if  the VID information is requested */
 124         if (filter_mask & RTEXT_FILTER_BRVLAN) {
 125                 struct nlattr *af;
 126                 const struct net_port_vlans *pv;
 127                 struct bridge_vlan_info vinfo;
 128                 u16 vid;
 129                 u16 pvid;
 130
 131                 if (port)
 132                         pv = nbp_get_vlan_info(port);
 133                 else
 134                         pv = br_get_vlan_info(br);
 135
 136                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
 137                         goto done;
 138
 139                 af = nla_nest_start(skb, IFLA_AF_SPEC);
 140                 if (!af)
 141                         goto nla_put_failure;
 142
 143                 pvid = br_get_pvid(pv);
 144                 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 145                         vinfo.vid = vid;
 146                         vinfo.flags = 0;
 147                         if (vid == pvid)
 148                                 vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
 149
 150                         if (test_bit(vid, pv->untagged_bitmap))
 151                                 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 152
 153                         if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 154                                     sizeof(vinfo), &vinfo))
 155                                 goto nla_put_failure;
 156                 }
 157
 158                 nla_nest_end(skb, af);
 159         }
 160
 161 done:
 162         return nlmsg_end(skb, nlh);
 163
 164 nla_put_failure:
 165         nlmsg_cancel(skb, nlh);
 166         return -EMSGSIZE;
 167 }
 168
 169 /*
 170  * Notify listeners of a change in port information
 171  */
 172 void br_ifinfo_notify(int event, struct net_bridge_port *port)
 173 {
 174         struct net *net;
 175         struct sk_buff *skb;
 176         int err = -ENOBUFS;
 177
 178         if (!port)
 179                 return;
 180
 181         net = dev_net(port->dev);
 182         br_debug(port->br, "port %u(%s) event %d\n",
 183                  (unsigned int)port->port_no, port->dev->name, event);
 184
 185         skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
 186         if (skb == NULL)
 187                 goto errout;
 188
 189         err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
 190         if (err < 0) {
 191                 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
 192                 WARN_ON(err == -EMSGSIZE);
 193                 kfree_skb(skb);
 194                 goto errout;
 195         }
 196         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
 197         return;
 198 errout:
 199         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 200 }
 201
 202
 203 /*
 204  * Dump information about all ports, in response to GETLINK
 205  */
 206 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 207                struct net_device *dev, u32 filter_mask)
 208 {
 209         int err = 0;
 210         struct net_bridge_port *port = br_port_get_rtnl(dev);
 211
 212         if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
 213                 goto out;
 214
 215         err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
 216                              filter_mask, dev);
 217 out:
 218         return err;
 219 }
 220
 221 static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
 222         [IFLA_BRIDGE_FLAGS]     = { .type = NLA_U16 },
 223         [IFLA_BRIDGE_MODE]      = { .type = NLA_U16 },
 224         [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
 225                                     .len = sizeof(struct bridge_vlan_info), },
 226 };
 227
 228 static int br_afspec(struct net_bridge *br,
 229                      struct net_bridge_port *p,
 230                      struct nlattr *af_spec,
 231                      int cmd)
 232 {
 233         struct nlattr *tb[IFLA_BRIDGE_MAX+1];
 234         int err = 0;
 235
 236         err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
 237         if (err)
 238                 return err;
 239
 240         if (tb[IFLA_BRIDGE_VLAN_INFO]) {
 241                 struct bridge_vlan_info *vinfo;
 242
 243                 vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
 244
 245                 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
 246                         return -EINVAL;
 247
 248                 switch (cmd) {
 249                 case RTM_SETLINK:
 250                         if (p) {
 251                                 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
 252                                 if (err)
 253                                         break;
 254
 255                                 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 256                                         err = br_vlan_add(p->br, vinfo->vid,
 257                                                           vinfo->flags);
 258                         } else
 259                                 err = br_vlan_add(br, vinfo->vid, vinfo->flags);
 260
 261                         break;
 262
 263                 case RTM_DELLINK:
 264                         if (p) {
 265                                 nbp_vlan_delete(p, vinfo->vid);
 266                                 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 267                                         br_vlan_delete(p->br, vinfo->vid);
 268                         } else
 269                                 br_vlan_delete(br, vinfo->vid);
 270                         break;
 271                 }
 272         }
 273
 274         return err;
 275 }
 276
 277 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
 278         [IFLA_BRPORT_STATE]     = { .type = NLA_U8 },
 279         [IFLA_BRPORT_COST]      = { .type = NLA_U32 },
 280         [IFLA_BRPORT_PRIORITY]  = { .type = NLA_U16 },
 281         [IFLA_BRPORT_MODE]      = { .type = NLA_U8 },
 282         [IFLA_BRPORT_GUARD]     = { .type = NLA_U8 },
 283         [IFLA_BRPORT_PROTECT]   = { .type = NLA_U8 },
 284         [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
 285         [IFLA_BRPORT_LEARNING]  = { .type = NLA_U8 },
 286         [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
 287 };
 288
 289 /* Change the state of the port and notify spanning tree */
 290 static int br_set_port_state(struct net_bridge_port *p, u8 state)
 291 {
 292         if (state > BR_STATE_BLOCKING)
 293                 return -EINVAL;
 294
 295         /* if kernel STP is running, don't allow changes */
 296         if (p->br->stp_enabled == BR_KERNEL_STP)
 297                 return -EBUSY;
 298
 299         /* if device is not up, change is not allowed
 300          * if link is not present, only allowable state is disabled
 301          */
 302         if (!netif_running(p->dev) ||
 303             (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
 304                 return -ENETDOWN;
 305
 306         br_set_state(p, state);
 307         br_log_state(p);
 308         br_port_state_selection(p->br);
 309         return 0;
 310 }
 311
 312 /* Set/clear or port flags based on attribute */
 313 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 314                            int attrtype, unsigned long mask)
 315 {
 316         if (tb[attrtype]) {
 317                 u8 flag = nla_get_u8(tb[attrtype]);
 318                 if (flag)
 319                         p->flags |= mask;
 320                 else
 321                         p->flags &= ~mask;
 322         }
 323 }
 324
 325 /* Process bridge protocol info on port */
 326 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
 327 {
 328         int err;
 329         unsigned long old_flags = p->flags;
 330
 331         br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
 332         br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
 333         br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
 334         br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
 335         br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
 336         br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
 337         br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
 338
 339         if (tb[IFLA_BRPORT_COST]) {
 340                 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
 341                 if (err)
 342                         return err;
 343         }
 344
 345         if (tb[IFLA_BRPORT_PRIORITY]) {
 346                 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
 347                 if (err)
 348                         return err;
 349         }
 350
 351         if (tb[IFLA_BRPORT_STATE]) {
 352                 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
 353                 if (err)
 354                         return err;
 355         }
 356
 357         br_port_flags_change(p, old_flags ^ p->flags);
 358         return 0;
 359 }
 360
 361 /* Change state and parameters on port. */
 362 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
 363 {
 364         struct nlattr *protinfo;
 365         struct nlattr *afspec;
 366         struct net_bridge_port *p;
 367         struct nlattr *tb[IFLA_BRPORT_MAX + 1];
 368         int err = 0;
 369
 370         protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
 371         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 372         if (!protinfo && !afspec)
 373                 return 0;
 374
 375         p = br_port_get_rtnl(dev);
 376         /* We want to accept dev as bridge itself if the AF_SPEC
 377          * is set to see if someone is setting vlan info on the bridge
 378          */
 379         if (!p && !afspec)
 380                 return -EINVAL;
 381
 382         if (p && protinfo) {
 383                 if (protinfo->nla_type & NLA_F_NESTED) {
 384                         err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
 385                                                protinfo, br_port_policy);
 386                         if (err)
 387                                 return err;
 388
 389                         spin_lock_bh(&p->br->lock);
 390                         err = br_setport(p, tb);
 391                         spin_unlock_bh(&p->br->lock);
 392                 } else {
 393                         /* Binary compatibility with old RSTP */
 394                         if (nla_len(protinfo) < sizeof(u8))
 395                                 return -EINVAL;
 396
 397                         spin_lock_bh(&p->br->lock);
 398                         err = br_set_port_state(p, nla_get_u8(protinfo));
 399                         spin_unlock_bh(&p->br->lock);
 400                 }
 401                 if (err)
 402                         goto out;
 403         }
 404
 405         if (afspec) {
 406                 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 407                                 afspec, RTM_SETLINK);
 408         }
 409
 410         if (err == 0)
 411                 br_ifinfo_notify(RTM_NEWLINK, p);
 412
 413 out:
 414         return err;
 415 }
 416
 417 /* Delete port information */
 418 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
 419 {
 420         struct nlattr *afspec;
 421         struct net_bridge_port *p;
 422         int err;
 423
 424         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 425         if (!afspec)
 426                 return 0;
 427
 428         p = br_port_get_rtnl(dev);
 429         /* We want to accept dev as bridge itself as well */
 430         if (!p && !(dev->priv_flags & IFF_EBRIDGE))
 431                 return -EINVAL;
 432
 433         err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 434                         afspec, RTM_DELLINK);
 435
 436         return err;
 437 }
 438 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
 439 {
 440         if (tb[IFLA_ADDRESS]) {
 441                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 442                         return -EINVAL;
 443                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 444                         return -EADDRNOTAVAIL;
 445         }
 446
 447         return 0;
 448 }
 449
 450 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
 451                           struct nlattr *tb[], struct nlattr *data[])
 452 {
 453         struct net_bridge *br = netdev_priv(dev);
 454
 455         if (tb[IFLA_ADDRESS]) {
 456                 spin_lock_bh(&br->lock);
 457                 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
 458                 spin_unlock_bh(&br->lock);
 459         }
 460
 461         return register_netdevice(dev);
 462 }
 463
 464 static int br_port_slave_changelink(struct net_device *brdev,
 465                                     struct net_device *dev,
 466                                     struct nlattr *tb[],
 467                                     struct nlattr *data[])
 468 {
 469         if (!data)
 470                 return 0;
 471         return br_setport(br_port_get_rtnl(dev), data);
 472 }
 473
 474 static int br_port_fill_slave_info(struct sk_buff *skb,
 475                                    const struct net_device *brdev,
 476                                    const struct net_device *dev)
 477 {
 478         return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
 479 }
 480
 481 static size_t br_port_get_slave_size(const struct net_device *brdev,
 482                                      const struct net_device *dev)
 483 {
 484         return br_port_info_size();
 485 }
 486
 487 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
 488         [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
 489         [IFLA_BR_HELLO_TIME]    = { .type = NLA_U32 },
 490         [IFLA_BR_MAX_AGE]       = { .type = NLA_U32 },
 491 };
 492
 493 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 494                          struct nlattr *data[])
 495 {
 496         struct net_bridge *br = netdev_priv(brdev);
 497         int err;
 498
 499         if (!data)
 500                 return 0;
 501
 502         if (data[IFLA_BR_FORWARD_DELAY]) {
 503                 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
 504                 if (err)
 505                         return err;
 506         }
 507
 508         if (data[IFLA_BR_HELLO_TIME]) {
 509                 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
 510                 if (err)
 511                         return err;
 512         }
 513
 514         if (data[IFLA_BR_MAX_AGE]) {
 515                 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
 516                 if (err)
 517                         return err;
 518         }
 519
 520         return 0;
 521 }
 522
 523 static size_t br_get_size(const struct net_device *brdev)
 524 {
 525         return nla_total_size(sizeof(u32)) +    /* IFLA_BR_FORWARD_DELAY  */
 526                nla_total_size(sizeof(u32)) +    /* IFLA_BR_HELLO_TIME */
 527                nla_total_size(sizeof(u32)) +    /* IFLA_BR_MAX_AGE */
 528                0;
 529 }
 530
 531 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 532 {
 533         struct net_bridge *br = netdev_priv(brdev);
 534         u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
 535         u32 hello_time = jiffies_to_clock_t(br->hello_time);
 536         u32 age_time = jiffies_to_clock_t(br->max_age);
 537
 538         if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
 539             nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
 540             nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
 541                 return -EMSGSIZE;
 542
 543         return 0;
 544 }
 545
 546 static size_t br_get_link_af_size(const struct net_device *dev)
 547 {
 548         struct net_port_vlans *pv;
 549
 550         if (br_port_exists(dev))
 551                 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
 552         else if (dev->priv_flags & IFF_EBRIDGE)
 553                 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
 554         else
 555                 return 0;
 556
 557         if (!pv)
 558                 return 0;
 559
 560         /* Each VLAN is returned in bridge_vlan_info along with flags */
 561         return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
 562 }
 563
 564 static struct rtnl_af_ops br_af_ops = {
 565         .family                 = AF_BRIDGE,
 566         .get_link_af_size       = br_get_link_af_size,
 567 };
 568
 569 struct rtnl_link_ops br_link_ops __read_mostly = {
 570         .kind                   = "bridge",
 571         .priv_size              = sizeof(struct net_bridge),
 572         .setup                  = br_dev_setup,
 573         .maxtype                = IFLA_BRPORT_MAX,
 574         .policy                 = br_policy,
 575         .validate               = br_validate,
 576         .newlink                = br_dev_newlink,
 577         .changelink             = br_changelink,
 578         .dellink                = br_dev_delete,
 579         .get_size               = br_get_size,
 580         .fill_info              = br_fill_info,
 581
 582         .slave_maxtype          = IFLA_BRPORT_MAX,
 583         .slave_policy           = br_port_policy,
 584         .slave_changelink       = br_port_slave_changelink,
 585         .get_slave_size         = br_port_get_slave_size,
 586         .fill_slave_info        = br_port_fill_slave_info,
 587 };
 588
 589 int __init br_netlink_init(void)
 590 {
 591         int err;
 592
 593         br_mdb_init();
 594         rtnl_af_register(&br_af_ops);
 595
 596         err = rtnl_link_register(&br_link_ops);
 597         if (err)
 598                 goto out_af;
 599
 600         return 0;
 601
 602 out_af:
 603         rtnl_af_unregister(&br_af_ops);
 604         br_mdb_uninit();
 605         return err;
 606 }
 607
 608 void br_netlink_fini(void)
 609 {
 610         br_mdb_uninit();
 611         rtnl_af_unregister(&br_af_ops);
 612         rtnl_link_unregister(&br_link_ops);
 613 }