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 int __get_num_vlan_infos(struct net_bridge_vlan_group *vg,
  25                                 u32 filter_mask)
  26 {
  27         struct net_bridge_vlan *v;
  28         u16 vid_range_start = 0, vid_range_end = 0, vid_range_flags = 0;
  29         u16 flags, pvid;
  30         int num_vlans = 0;
  31
  32         if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
  33                 return 0;
  34
  35         pvid = br_get_pvid(vg);
  36         /* Count number of vlan infos */
  37         list_for_each_entry_rcu(v, &vg->vlan_list, vlist) {
  38                 flags = 0;
  39                 /* only a context, bridge vlan not activated */
  40                 if (!br_vlan_should_use(v))
  41                         continue;
  42                 if (v->vid == pvid)
  43                         flags |= BRIDGE_VLAN_INFO_PVID;
  44
  45                 if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
  46                         flags |= BRIDGE_VLAN_INFO_UNTAGGED;
  47
  48                 if (vid_range_start == 0) {
  49                         goto initvars;
  50                 } else if ((v->vid - vid_range_end) == 1 &&
  51                         flags == vid_range_flags) {
  52                         vid_range_end = v->vid;
  53                         continue;
  54                 } else {
  55                         if ((vid_range_end - vid_range_start) > 0)
  56                                 num_vlans += 2;
  57                         else
  58                                 num_vlans += 1;
  59                 }
  60 initvars:
  61                 vid_range_start = v->vid;
  62                 vid_range_end = v->vid;
  63                 vid_range_flags = flags;
  64         }
  65
  66         if (vid_range_start != 0) {
  67                 if ((vid_range_end - vid_range_start) > 0)
  68                         num_vlans += 2;
  69                 else
  70                         num_vlans += 1;
  71         }
  72
  73         return num_vlans;
  74 }
  75
  76 static int br_get_num_vlan_infos(struct net_bridge_vlan_group *vg,
  77                                  u32 filter_mask)
  78 {
  79         int num_vlans;
  80
  81         if (!vg)
  82                 return 0;
  83
  84         if (filter_mask & RTEXT_FILTER_BRVLAN)
  85                 return vg->num_vlans;
  86
  87         rcu_read_lock();
  88         num_vlans = __get_num_vlan_infos(vg, filter_mask);
  89         rcu_read_unlock();
  90
  91         return num_vlans;
  92 }
  93
  94 static size_t br_get_link_af_size_filtered(const struct net_device *dev,
  95                                            u32 filter_mask)
  96 {
  97         struct net_bridge_vlan_group *vg = NULL;
  98         struct net_bridge_port *p;
  99         struct net_bridge *br;
 100         int num_vlan_infos;
 101
 102         rcu_read_lock();
 103         if (br_port_exists(dev)) {
 104                 p = br_port_get_rcu(dev);
 105                 vg = nbp_vlan_group(p);
 106         } else if (dev->priv_flags & IFF_EBRIDGE) {
 107                 br = netdev_priv(dev);
 108                 vg = br_vlan_group(br);
 109         }
 110         num_vlan_infos = br_get_num_vlan_infos(vg, filter_mask);
 111         rcu_read_unlock();
 112
 113         /* Each VLAN is returned in bridge_vlan_info along with flags */
 114         return num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));
 115 }
 116
 117 static inline size_t br_port_info_size(void)
 118 {
 119         return nla_total_size(1)        /* IFLA_BRPORT_STATE  */
 120                 + nla_total_size(2)     /* IFLA_BRPORT_PRIORITY */
 121                 + nla_total_size(4)     /* IFLA_BRPORT_COST */
 122                 + nla_total_size(1)     /* IFLA_BRPORT_MODE */
 123                 + nla_total_size(1)     /* IFLA_BRPORT_GUARD */
 124                 + nla_total_size(1)     /* IFLA_BRPORT_PROTECT */
 125                 + nla_total_size(1)     /* IFLA_BRPORT_FAST_LEAVE */
 126                 + nla_total_size(1)     /* IFLA_BRPORT_LEARNING */
 127                 + nla_total_size(1)     /* IFLA_BRPORT_UNICAST_FLOOD */
 128                 + nla_total_size(1)     /* IFLA_BRPORT_PROXYARP */
 129                 + nla_total_size(1)     /* IFLA_BRPORT_PROXYARP_WIFI */
 130                 + 0;
 131 }
 132
 133 static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
 134 {
 135         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 136                 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 137                 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 138                 + nla_total_size(4) /* IFLA_MASTER */
 139                 + nla_total_size(4) /* IFLA_MTU */
 140                 + nla_total_size(4) /* IFLA_LINK */
 141                 + nla_total_size(1) /* IFLA_OPERSTATE */
 142                 + nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */
 143                 + nla_total_size(br_get_link_af_size_filtered(dev,
 144                                  filter_mask)); /* IFLA_AF_SPEC */
 145 }
 146
 147 static int br_port_fill_attrs(struct sk_buff *skb,
 148                               const struct net_bridge_port *p)
 149 {
 150         u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
 151
 152         if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
 153             nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
 154             nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
 155             nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
 156             nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
 157             nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
 158             nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
 159             nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
 160             nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
 161             nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
 162             nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
 163                        !!(p->flags & BR_PROXYARP_WIFI)))
 164                 return -EMSGSIZE;
 165
 166         return 0;
 167 }
 168
 169 static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start,
 170                                     u16 vid_end, u16 flags)
 171 {
 172         struct  bridge_vlan_info vinfo;
 173
 174         if ((vid_end - vid_start) > 0) {
 175                 /* add range to skb */
 176                 vinfo.vid = vid_start;
 177                 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN;
 178                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 179                             sizeof(vinfo), &vinfo))
 180                         goto nla_put_failure;
 181
 182                 vinfo.vid = vid_end;
 183                 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END;
 184                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 185                             sizeof(vinfo), &vinfo))
 186                         goto nla_put_failure;
 187         } else {
 188                 vinfo.vid = vid_start;
 189                 vinfo.flags = flags;
 190                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 191                             sizeof(vinfo), &vinfo))
 192                         goto nla_put_failure;
 193         }
 194
 195         return 0;
 196
 197 nla_put_failure:
 198         return -EMSGSIZE;
 199 }
 200
 201 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
 202                                          struct net_bridge_vlan_group *vg)
 203 {
 204         struct net_bridge_vlan *v;
 205         u16 vid_range_start = 0, vid_range_end = 0, vid_range_flags = 0;
 206         u16 flags, pvid;
 207         int err = 0;
 208
 209         /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan
 210          * and mark vlan info with begin and end flags
 211          * if vlaninfo represents a range
 212          */
 213         pvid = br_get_pvid(vg);
 214         list_for_each_entry(v, &vg->vlan_list, vlist) {
 215                 flags = 0;
 216                 if (!br_vlan_should_use(v))
 217                         continue;
 218                 if (v->vid == pvid)
 219                         flags |= BRIDGE_VLAN_INFO_PVID;
 220
 221                 if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
 222                         flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 223
 224                 if (vid_range_start == 0) {
 225                         goto initvars;
 226                 } else if ((v->vid - vid_range_end) == 1 &&
 227                         flags == vid_range_flags) {
 228                         vid_range_end = v->vid;
 229                         continue;
 230                 } else {
 231                         err = br_fill_ifvlaninfo_range(skb, vid_range_start,
 232                                                        vid_range_end,
 233                                                        vid_range_flags);
 234                         if (err)
 235                                 return err;
 236                 }
 237
 238 initvars:
 239                 vid_range_start = v->vid;
 240                 vid_range_end = v->vid;
 241                 vid_range_flags = flags;
 242         }
 243
 244         if (vid_range_start != 0) {
 245                 /* Call it once more to send any left over vlans */
 246                 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
 247                                                vid_range_end,
 248                                                vid_range_flags);
 249                 if (err)
 250                         return err;
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int br_fill_ifvlaninfo(struct sk_buff *skb,
 257                               struct net_bridge_vlan_group *vg)
 258 {
 259         struct bridge_vlan_info vinfo;
 260         struct net_bridge_vlan *v;
 261         u16 pvid;
 262
 263         pvid = br_get_pvid(vg);
 264         list_for_each_entry(v, &vg->vlan_list, vlist) {
 265                 if (!br_vlan_should_use(v))
 266                         continue;
 267
 268                 vinfo.vid = v->vid;
 269                 vinfo.flags = 0;
 270                 if (v->vid == pvid)
 271                         vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
 272
 273                 if (v->flags & BRIDGE_VLAN_INFO_UNTAGGED)
 274                         vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 275
 276                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 277                             sizeof(vinfo), &vinfo))
 278                         goto nla_put_failure;
 279         }
 280
 281         return 0;
 282
 283 nla_put_failure:
 284         return -EMSGSIZE;
 285 }
 286
 287 /*
 288  * Create one netlink message for one interface
 289  * Contains port and master info as well as carrier and bridge state.
 290  */
 291 static int br_fill_ifinfo(struct sk_buff *skb,
 292                           struct net_bridge_port *port,
 293                           u32 pid, u32 seq, int event, unsigned int flags,
 294                           u32 filter_mask, const struct net_device *dev)
 295 {
 296         struct net_bridge *br;
 297         struct ifinfomsg *hdr;
 298         struct nlmsghdr *nlh;
 299         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
 300
 301         if (port)
 302                 br = port->br;
 303         else
 304                 br = netdev_priv(dev);
 305
 306         br_debug(br, "br_fill_info event %d port %s master %s\n",
 307                      event, dev->name, br->dev->name);
 308
 309         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
 310         if (nlh == NULL)
 311                 return -EMSGSIZE;
 312
 313         hdr = nlmsg_data(nlh);
 314         hdr->ifi_family = AF_BRIDGE;
 315         hdr->__ifi_pad = 0;
 316         hdr->ifi_type = dev->type;
 317         hdr->ifi_index = dev->ifindex;
 318         hdr->ifi_flags = dev_get_flags(dev);
 319         hdr->ifi_change = 0;
 320
 321         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
 322             nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
 323             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 324             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
 325             (dev->addr_len &&
 326              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
 327             (dev->ifindex != dev_get_iflink(dev) &&
 328              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
 329                 goto nla_put_failure;
 330
 331         if (event == RTM_NEWLINK && port) {
 332                 struct nlattr *nest
 333                         = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
 334
 335                 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
 336                         goto nla_put_failure;
 337                 nla_nest_end(skb, nest);
 338         }
 339
 340         /* Check if  the VID information is requested */
 341         if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
 342             (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
 343                 struct net_bridge_vlan_group *vg;
 344                 struct nlattr *af;
 345                 int err;
 346
 347                 if (port)
 348                         vg = nbp_vlan_group(port);
 349                 else
 350                         vg = br_vlan_group(br);
 351
 352                 if (!vg || !vg->num_vlans)
 353                         goto done;
 354
 355                 af = nla_nest_start(skb, IFLA_AF_SPEC);
 356                 if (!af)
 357                         goto nla_put_failure;
 358
 359                 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
 360                         err = br_fill_ifvlaninfo_compressed(skb, vg);
 361                 else
 362                         err = br_fill_ifvlaninfo(skb, vg);
 363                 if (err)
 364                         goto nla_put_failure;
 365                 nla_nest_end(skb, af);
 366         }
 367
 368 done:
 369         nlmsg_end(skb, nlh);
 370         return 0;
 371
 372 nla_put_failure:
 373         nlmsg_cancel(skb, nlh);
 374         return -EMSGSIZE;
 375 }
 376
 377 /*
 378  * Notify listeners of a change in port information
 379  */
 380 void br_ifinfo_notify(int event, struct net_bridge_port *port)
 381 {
 382         struct net *net;
 383         struct sk_buff *skb;
 384         int err = -ENOBUFS;
 385         u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
 386
 387         if (!port)
 388                 return;
 389
 390         net = dev_net(port->dev);
 391         br_debug(port->br, "port %u(%s) event %d\n",
 392                  (unsigned int)port->port_no, port->dev->name, event);
 393
 394         skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC);
 395         if (skb == NULL)
 396                 goto errout;
 397
 398         err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev);
 399         if (err < 0) {
 400                 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
 401                 WARN_ON(err == -EMSGSIZE);
 402                 kfree_skb(skb);
 403                 goto errout;
 404         }
 405         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
 406         return;
 407 errout:
 408         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 409 }
 410
 411
 412 /*
 413  * Dump information about all ports, in response to GETLINK
 414  */
 415 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 416                struct net_device *dev, u32 filter_mask, int nlflags)
 417 {
 418         struct net_bridge_port *port = br_port_get_rtnl(dev);
 419
 420         if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
 421             !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
 422                 return 0;
 423
 424         return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
 425                               filter_mask, dev);
 426 }
 427
 428 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
 429                         int cmd, struct bridge_vlan_info *vinfo)
 430 {
 431         int err = 0;
 432
 433         switch (cmd) {
 434         case RTM_SETLINK:
 435                 if (p) {
 436                         /* if the MASTER flag is set this will act on the global
 437                          * per-VLAN entry as well
 438                          */
 439                         err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
 440                         if (err)
 441                                 break;
 442                 } else {
 443                         vinfo->flags |= BRIDGE_VLAN_INFO_BRENTRY;
 444                         err = br_vlan_add(br, vinfo->vid, vinfo->flags);
 445                 }
 446                 break;
 447
 448         case RTM_DELLINK:
 449                 if (p) {
 450                         nbp_vlan_delete(p, vinfo->vid);
 451                         if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 452                                 br_vlan_delete(p->br, vinfo->vid);
 453                 } else {
 454                         br_vlan_delete(br, vinfo->vid);
 455                 }
 456                 break;
 457         }
 458
 459         return err;
 460 }
 461
 462 static int br_afspec(struct net_bridge *br,
 463                      struct net_bridge_port *p,
 464                      struct nlattr *af_spec,
 465                      int cmd)
 466 {
 467         struct bridge_vlan_info *vinfo_start = NULL;
 468         struct bridge_vlan_info *vinfo = NULL;
 469         struct nlattr *attr;
 470         int err = 0;
 471         int rem;
 472
 473         nla_for_each_nested(attr, af_spec, rem) {
 474                 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 475                         continue;
 476                 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 477                         return -EINVAL;
 478                 vinfo = nla_data(attr);
 479                 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
 480                         return -EINVAL;
 481                 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 482                         if (vinfo_start)
 483                                 return -EINVAL;
 484                         vinfo_start = vinfo;
 485                         continue;
 486                 }
 487
 488                 if (vinfo_start) {
 489                         struct bridge_vlan_info tmp_vinfo;
 490                         int v;
 491
 492                         if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
 493                                 return -EINVAL;
 494
 495                         if (vinfo->vid <= vinfo_start->vid)
 496                                 return -EINVAL;
 497
 498                         memcpy(&tmp_vinfo, vinfo_start,
 499                                sizeof(struct bridge_vlan_info));
 500
 501                         for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
 502                                 tmp_vinfo.vid = v;
 503                                 err = br_vlan_info(br, p, cmd, &tmp_vinfo);
 504                                 if (err)
 505                                         break;
 506                         }
 507                         vinfo_start = NULL;
 508                 } else {
 509                         err = br_vlan_info(br, p, cmd, vinfo);
 510                 }
 511                 if (err)
 512                         break;
 513         }
 514
 515         return err;
 516 }
 517
 518 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
 519         [IFLA_BRPORT_STATE]     = { .type = NLA_U8 },
 520         [IFLA_BRPORT_COST]      = { .type = NLA_U32 },
 521         [IFLA_BRPORT_PRIORITY]  = { .type = NLA_U16 },
 522         [IFLA_BRPORT_MODE]      = { .type = NLA_U8 },
 523         [IFLA_BRPORT_GUARD]     = { .type = NLA_U8 },
 524         [IFLA_BRPORT_PROTECT]   = { .type = NLA_U8 },
 525         [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
 526         [IFLA_BRPORT_LEARNING]  = { .type = NLA_U8 },
 527         [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
 528         [IFLA_BRPORT_PROXYARP]  = { .type = NLA_U8 },
 529         [IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 },
 530 };
 531
 532 /* Change the state of the port and notify spanning tree */
 533 static int br_set_port_state(struct net_bridge_port *p, u8 state)
 534 {
 535         if (state > BR_STATE_BLOCKING)
 536                 return -EINVAL;
 537
 538         /* if kernel STP is running, don't allow changes */
 539         if (p->br->stp_enabled == BR_KERNEL_STP)
 540                 return -EBUSY;
 541
 542         /* if device is not up, change is not allowed
 543          * if link is not present, only allowable state is disabled
 544          */
 545         if (!netif_running(p->dev) ||
 546             (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
 547                 return -ENETDOWN;
 548
 549         br_set_state(p, state);
 550         br_log_state(p);
 551         br_port_state_selection(p->br);
 552         return 0;
 553 }
 554
 555 /* Set/clear or port flags based on attribute */
 556 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 557                            int attrtype, unsigned long mask)
 558 {
 559         if (tb[attrtype]) {
 560                 u8 flag = nla_get_u8(tb[attrtype]);
 561                 if (flag)
 562                         p->flags |= mask;
 563                 else
 564                         p->flags &= ~mask;
 565         }
 566 }
 567
 568 /* Process bridge protocol info on port */
 569 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
 570 {
 571         int err;
 572         unsigned long old_flags = p->flags;
 573
 574         br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
 575         br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
 576         br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
 577         br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
 578         br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
 579         br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
 580         br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
 581         br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
 582
 583         if (tb[IFLA_BRPORT_COST]) {
 584                 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
 585                 if (err)
 586                         return err;
 587         }
 588
 589         if (tb[IFLA_BRPORT_PRIORITY]) {
 590                 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
 591                 if (err)
 592                         return err;
 593         }
 594
 595         if (tb[IFLA_BRPORT_STATE]) {
 596                 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
 597                 if (err)
 598                         return err;
 599         }
 600
 601         br_port_flags_change(p, old_flags ^ p->flags);
 602         return 0;
 603 }
 604
 605 /* Change state and parameters on port. */
 606 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 607 {
 608         struct nlattr *protinfo;
 609         struct nlattr *afspec;
 610         struct net_bridge_port *p;
 611         struct nlattr *tb[IFLA_BRPORT_MAX + 1];
 612         int err = 0;
 613
 614         protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
 615         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 616         if (!protinfo && !afspec)
 617                 return 0;
 618
 619         p = br_port_get_rtnl(dev);
 620         /* We want to accept dev as bridge itself if the AF_SPEC
 621          * is set to see if someone is setting vlan info on the bridge
 622          */
 623         if (!p && !afspec)
 624                 return -EINVAL;
 625
 626         if (p && protinfo) {
 627                 if (protinfo->nla_type & NLA_F_NESTED) {
 628                         err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
 629                                                protinfo, br_port_policy);
 630                         if (err)
 631                                 return err;
 632
 633                         spin_lock_bh(&p->br->lock);
 634                         err = br_setport(p, tb);
 635                         spin_unlock_bh(&p->br->lock);
 636                 } else {
 637                         /* Binary compatibility with old RSTP */
 638                         if (nla_len(protinfo) < sizeof(u8))
 639                                 return -EINVAL;
 640
 641                         spin_lock_bh(&p->br->lock);
 642                         err = br_set_port_state(p, nla_get_u8(protinfo));
 643                         spin_unlock_bh(&p->br->lock);
 644                 }
 645                 if (err)
 646                         goto out;
 647         }
 648
 649         if (afspec) {
 650                 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 651                                 afspec, RTM_SETLINK);
 652         }
 653
 654         if (err == 0)
 655                 br_ifinfo_notify(RTM_NEWLINK, p);
 656 out:
 657         return err;
 658 }
 659
 660 /* Delete port information */
 661 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 662 {
 663         struct nlattr *afspec;
 664         struct net_bridge_port *p;
 665         int err = 0;
 666
 667         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 668         if (!afspec)
 669                 return 0;
 670
 671         p = br_port_get_rtnl(dev);
 672         /* We want to accept dev as bridge itself as well */
 673         if (!p && !(dev->priv_flags & IFF_EBRIDGE))
 674                 return -EINVAL;
 675
 676         err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 677                         afspec, RTM_DELLINK);
 678         if (err == 0)
 679                 /* Send RTM_NEWLINK because userspace
 680                  * expects RTM_NEWLINK for vlan dels
 681                  */
 682                 br_ifinfo_notify(RTM_NEWLINK, p);
 683
 684         return err;
 685 }
 686 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
 687 {
 688         if (tb[IFLA_ADDRESS]) {
 689                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 690                         return -EINVAL;
 691                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 692                         return -EADDRNOTAVAIL;
 693         }
 694
 695         if (!data)
 696                 return 0;
 697
 698 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 699         if (data[IFLA_BR_VLAN_PROTOCOL]) {
 700                 switch (nla_get_be16(data[IFLA_BR_VLAN_PROTOCOL])) {
 701                 case htons(ETH_P_8021Q):
 702                 case htons(ETH_P_8021AD):
 703                         break;
 704                 default:
 705                         return -EPROTONOSUPPORT;
 706                 }
 707         }
 708 #endif
 709
 710         return 0;
 711 }
 712
 713 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
 714                           struct nlattr *tb[], struct nlattr *data[])
 715 {
 716         struct net_bridge *br = netdev_priv(dev);
 717
 718         if (tb[IFLA_ADDRESS]) {
 719                 spin_lock_bh(&br->lock);
 720                 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
 721                 spin_unlock_bh(&br->lock);
 722         }
 723
 724         return register_netdevice(dev);
 725 }
 726
 727 static int br_port_slave_changelink(struct net_device *brdev,
 728                                     struct net_device *dev,
 729                                     struct nlattr *tb[],
 730                                     struct nlattr *data[])
 731 {
 732         struct net_bridge *br = netdev_priv(brdev);
 733         int ret;
 734
 735         if (!data)
 736                 return 0;
 737
 738         spin_lock_bh(&br->lock);
 739         ret = br_setport(br_port_get_rtnl(dev), data);
 740         spin_unlock_bh(&br->lock);
 741
 742         return ret;
 743 }
 744
 745 static int br_port_fill_slave_info(struct sk_buff *skb,
 746                                    const struct net_device *brdev,
 747                                    const struct net_device *dev)
 748 {
 749         return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
 750 }
 751
 752 static size_t br_port_get_slave_size(const struct net_device *brdev,
 753                                      const struct net_device *dev)
 754 {
 755         return br_port_info_size();
 756 }
 757
 758 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
 759         [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
 760         [IFLA_BR_HELLO_TIME]    = { .type = NLA_U32 },
 761         [IFLA_BR_MAX_AGE]       = { .type = NLA_U32 },
 762         [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 },
 763         [IFLA_BR_STP_STATE] = { .type = NLA_U32 },
 764         [IFLA_BR_PRIORITY] = { .type = NLA_U16 },
 765         [IFLA_BR_VLAN_FILTERING] = { .type = NLA_U8 },
 766         [IFLA_BR_VLAN_PROTOCOL] = { .type = NLA_U16 },
 767         [IFLA_BR_GROUP_FWD_MASK] = { .type = NLA_U16 },
 768         [IFLA_BR_GROUP_ADDR] = { .type = NLA_BINARY,
 769                                  .len  = ETH_ALEN },
 770         [IFLA_BR_MCAST_ROUTER] = { .type = NLA_U8 },
 771         [IFLA_BR_MCAST_SNOOPING] = { .type = NLA_U8 },
 772         [IFLA_BR_MCAST_QUERY_USE_IFADDR] = { .type = NLA_U8 },
 773         [IFLA_BR_MCAST_QUERIER] = { .type = NLA_U8 },
 774 };
 775
 776 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 777                          struct nlattr *data[])
 778 {
 779         struct net_bridge *br = netdev_priv(brdev);
 780         int err;
 781
 782         if (!data)
 783                 return 0;
 784
 785         if (data[IFLA_BR_FORWARD_DELAY]) {
 786                 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
 787                 if (err)
 788                         return err;
 789         }
 790
 791         if (data[IFLA_BR_HELLO_TIME]) {
 792                 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
 793                 if (err)
 794                         return err;
 795         }
 796
 797         if (data[IFLA_BR_MAX_AGE]) {
 798                 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
 799                 if (err)
 800                         return err;
 801         }
 802
 803         if (data[IFLA_BR_AGEING_TIME]) {
 804                 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]);
 805
 806                 br->ageing_time = clock_t_to_jiffies(ageing_time);
 807         }
 808
 809         if (data[IFLA_BR_STP_STATE]) {
 810                 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]);
 811
 812                 br_stp_set_enabled(br, stp_enabled);
 813         }
 814
 815         if (data[IFLA_BR_PRIORITY]) {
 816                 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]);
 817
 818                 br_stp_set_bridge_priority(br, priority);
 819         }
 820
 821         if (data[IFLA_BR_VLAN_FILTERING]) {
 822                 u8 vlan_filter = nla_get_u8(data[IFLA_BR_VLAN_FILTERING]);
 823
 824                 err = __br_vlan_filter_toggle(br, vlan_filter);
 825                 if (err)
 826                         return err;
 827         }
 828
 829 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 830         if (data[IFLA_BR_VLAN_PROTOCOL]) {
 831                 __be16 vlan_proto = nla_get_be16(data[IFLA_BR_VLAN_PROTOCOL]);
 832
 833                 err = __br_vlan_set_proto(br, vlan_proto);
 834                 if (err)
 835                         return err;
 836         }
 837 #endif
 838
 839         if (data[IFLA_BR_GROUP_FWD_MASK]) {
 840                 u16 fwd_mask = nla_get_u16(data[IFLA_BR_GROUP_FWD_MASK]);
 841
 842                 if (fwd_mask & BR_GROUPFWD_RESTRICTED)
 843                         return -EINVAL;
 844                 br->group_fwd_mask = fwd_mask;
 845         }
 846
 847         if (data[IFLA_BR_GROUP_ADDR]) {
 848                 u8 new_addr[ETH_ALEN];
 849
 850                 if (nla_len(data[IFLA_BR_GROUP_ADDR]) != ETH_ALEN)
 851                         return -EINVAL;
 852                 memcpy(new_addr, nla_data(data[IFLA_BR_GROUP_ADDR]), ETH_ALEN);
 853                 if (!is_link_local_ether_addr(new_addr))
 854                         return -EINVAL;
 855                 if (new_addr[5] == 1 ||         /* 802.3x Pause address */
 856                     new_addr[5] == 2 ||         /* 802.3ad Slow protocols */
 857                     new_addr[5] == 3)           /* 802.1X PAE address */
 858                         return -EINVAL;
 859                 spin_lock_bh(&br->lock);
 860                 memcpy(br->group_addr, new_addr, sizeof(br->group_addr));
 861                 spin_unlock_bh(&br->lock);
 862                 br->group_addr_set = true;
 863                 br_recalculate_fwd_mask(br);
 864         }
 865
 866         if (data[IFLA_BR_FDB_FLUSH])
 867                 br_fdb_flush(br);
 868
 869 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 870         if (data[IFLA_BR_MCAST_ROUTER]) {
 871                 u8 multicast_router = nla_get_u8(data[IFLA_BR_MCAST_ROUTER]);
 872
 873                 err = br_multicast_set_router(br, multicast_router);
 874                 if (err)
 875                         return err;
 876         }
 877
 878         if (data[IFLA_BR_MCAST_SNOOPING]) {
 879                 u8 mcast_snooping = nla_get_u8(data[IFLA_BR_MCAST_SNOOPING]);
 880
 881                 err = br_multicast_toggle(br, mcast_snooping);
 882                 if (err)
 883                         return err;
 884         }
 885
 886         if (data[IFLA_BR_MCAST_QUERY_USE_IFADDR]) {
 887                 u8 val;
 888
 889                 val = nla_get_u8(data[IFLA_BR_MCAST_QUERY_USE_IFADDR]);
 890                 br->multicast_query_use_ifaddr = !!val;
 891         }
 892
 893         if (data[IFLA_BR_MCAST_QUERIER]) {
 894                 u8 mcast_querier = nla_get_u8(data[IFLA_BR_MCAST_QUERIER]);
 895
 896                 err = br_multicast_set_querier(br, mcast_querier);
 897                 if (err)
 898                         return err;
 899         }
 900 #endif
 901
 902         return 0;
 903 }
 904
 905 static size_t br_get_size(const struct net_device *brdev)
 906 {
 907         return nla_total_size(sizeof(u32)) +    /* IFLA_BR_FORWARD_DELAY  */
 908                nla_total_size(sizeof(u32)) +    /* IFLA_BR_HELLO_TIME */
 909                nla_total_size(sizeof(u32)) +    /* IFLA_BR_MAX_AGE */
 910                nla_total_size(sizeof(u32)) +    /* IFLA_BR_AGEING_TIME */
 911                nla_total_size(sizeof(u32)) +    /* IFLA_BR_STP_STATE */
 912                nla_total_size(sizeof(u16)) +    /* IFLA_BR_PRIORITY */
 913                nla_total_size(sizeof(u8)) +     /* IFLA_BR_VLAN_FILTERING */
 914 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 915                nla_total_size(sizeof(__be16)) + /* IFLA_BR_VLAN_PROTOCOL */
 916 #endif
 917                nla_total_size(sizeof(u16)) +    /* IFLA_BR_GROUP_FWD_MASK */
 918                nla_total_size(sizeof(struct ifla_bridge_id)) +   /* IFLA_BR_ROOT_ID */
 919                nla_total_size(sizeof(struct ifla_bridge_id)) +   /* IFLA_BR_BRIDGE_ID */
 920                nla_total_size(sizeof(u16)) +    /* IFLA_BR_ROOT_PORT */
 921                nla_total_size(sizeof(u32)) +    /* IFLA_BR_ROOT_PATH_COST */
 922                nla_total_size(sizeof(u8)) +    /* IFLA_BR_TOPOLOGY_CHANGE */
 923                nla_total_size(sizeof(u8)) +    /* IFLA_BR_TOPOLOGY_CHANGE_DETECTED */
 924                nla_total_size(sizeof(u64)) +    /* IFLA_BR_HELLO_TIMER */
 925                nla_total_size(sizeof(u64)) +    /* IFLA_BR_TCN_TIMER */
 926                nla_total_size(sizeof(u64)) +    /* IFLA_BR_TOPOLOGY_CHANGE_TIMER */
 927                nla_total_size(sizeof(u64)) +    /* IFLA_BR_GC_TIMER */
 928                nla_total_size(ETH_ALEN) +       /* IFLA_BR_GROUP_ADDR */
 929 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 930                nla_total_size(sizeof(u8)) +     /* IFLA_BR_MCAST_ROUTER */
 931                nla_total_size(sizeof(u8)) +     /* IFLA_BR_MCAST_SNOOPING */
 932                nla_total_size(sizeof(u8)) +     /* IFLA_BR_MCAST_QUERY_USE_IFADDR */
 933                nla_total_size(sizeof(u8)) +     /* IFLA_BR_MCAST_QUERIER */
 934 #endif
 935                0;
 936 }
 937
 938 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 939 {
 940         struct net_bridge *br = netdev_priv(brdev);
 941         u64 hello_timer, tcn_timer, topology_change_timer, gc_timer;
 942         u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
 943         u32 hello_time = jiffies_to_clock_t(br->hello_time);
 944         u32 age_time = jiffies_to_clock_t(br->max_age);
 945         u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
 946         u32 stp_enabled = br->stp_enabled;
 947         u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1];
 948         u16 group_fwd_mask = br->group_fwd_mask;
 949         u8 vlan_enabled = br_vlan_enabled(br);
 950         struct ifla_bridge_id root_id, bridge_id;
 951
 952         memset(&bridge_id, 0, sizeof(bridge_id));
 953         memset(&root_id, 0, sizeof(root_id));
 954         memcpy(root_id.prio, br->designated_root.prio, sizeof(root_id.prio));
 955         memcpy(root_id.addr, br->designated_root.addr, sizeof(root_id.addr));
 956         memcpy(bridge_id.prio, br->bridge_id.prio, sizeof(bridge_id.prio));
 957         memcpy(bridge_id.addr, br->bridge_id.addr, sizeof(bridge_id.addr));
 958         hello_timer = br_timer_value(&br->hello_timer);
 959         tcn_timer = br_timer_value(&br->tcn_timer);
 960         topology_change_timer = br_timer_value(&br->topology_change_timer);
 961         gc_timer = br_timer_value(&br->gc_timer);
 962
 963         if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
 964             nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
 965             nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) ||
 966             nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) ||
 967             nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) ||
 968             nla_put_u16(skb, IFLA_BR_PRIORITY, priority) ||
 969             nla_put_u8(skb, IFLA_BR_VLAN_FILTERING, vlan_enabled) ||
 970             nla_put_u16(skb, IFLA_BR_GROUP_FWD_MASK, group_fwd_mask) ||
 971             nla_put(skb, IFLA_BR_ROOT_ID, sizeof(root_id), &root_id) ||
 972             nla_put(skb, IFLA_BR_BRIDGE_ID, sizeof(bridge_id), &bridge_id) ||
 973             nla_put_u16(skb, IFLA_BR_ROOT_PORT, br->root_port) ||
 974             nla_put_u32(skb, IFLA_BR_ROOT_PATH_COST, br->root_path_cost) ||
 975             nla_put_u8(skb, IFLA_BR_TOPOLOGY_CHANGE, br->topology_change) ||
 976             nla_put_u8(skb, IFLA_BR_TOPOLOGY_CHANGE_DETECTED,
 977                        br->topology_change_detected) ||
 978             nla_put_u64(skb, IFLA_BR_HELLO_TIMER, hello_timer) ||
 979             nla_put_u64(skb, IFLA_BR_TCN_TIMER, tcn_timer) ||
 980             nla_put_u64(skb, IFLA_BR_TOPOLOGY_CHANGE_TIMER,
 981                         topology_change_timer) ||
 982             nla_put_u64(skb, IFLA_BR_GC_TIMER, gc_timer) ||
 983             nla_put(skb, IFLA_BR_GROUP_ADDR, ETH_ALEN, br->group_addr))
 984                 return -EMSGSIZE;
 985
 986 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 987         if (nla_put_be16(skb, IFLA_BR_VLAN_PROTOCOL, br->vlan_proto))
 988                 return -EMSGSIZE;
 989 #endif
 990
 991 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 992         if (nla_put_u8(skb, IFLA_BR_MCAST_ROUTER, br->multicast_router) ||
 993             nla_put_u8(skb, IFLA_BR_MCAST_SNOOPING, !br->multicast_disabled) ||
 994             nla_put_u8(skb, IFLA_BR_MCAST_QUERY_USE_IFADDR,
 995                        br->multicast_query_use_ifaddr) ||
 996             nla_put_u8(skb, IFLA_BR_MCAST_QUERIER, br->multicast_querier))
 997                 return -EMSGSIZE;
 998 #endif
 999
1000         return 0;
1001 }
1002
1003 static size_t br_get_link_af_size(const struct net_device *dev)
1004 {
1005         struct net_bridge_port *p;
1006         struct net_bridge *br;
1007         int num_vlans = 0;
1008
1009         if (br_port_exists(dev)) {
1010                 p = br_port_get_rtnl(dev);
1011                 num_vlans = br_get_num_vlan_infos(nbp_vlan_group(p),
1012                                                   RTEXT_FILTER_BRVLAN);
1013         } else if (dev->priv_flags & IFF_EBRIDGE) {
1014                 br = netdev_priv(dev);
1015                 num_vlans = br_get_num_vlan_infos(br_vlan_group(br),
1016                                                   RTEXT_FILTER_BRVLAN);
1017         }
1018
1019         /* Each VLAN is returned in bridge_vlan_info along with flags */
1020         return num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
1021 }
1022
1023 static struct rtnl_af_ops br_af_ops __read_mostly = {
1024         .family                 = AF_BRIDGE,
1025         .get_link_af_size       = br_get_link_af_size,
1026 };
1027
1028 struct rtnl_link_ops br_link_ops __read_mostly = {
1029         .kind                   = "bridge",
1030         .priv_size              = sizeof(struct net_bridge),
1031         .setup                  = br_dev_setup,
1032         .maxtype                = IFLA_BR_MAX,
1033         .policy                 = br_policy,
1034         .validate               = br_validate,
1035         .newlink                = br_dev_newlink,
1036         .changelink             = br_changelink,
1037         .dellink                = br_dev_delete,
1038         .get_size               = br_get_size,
1039         .fill_info              = br_fill_info,
1040
1041         .slave_maxtype          = IFLA_BRPORT_MAX,
1042         .slave_policy           = br_port_policy,
1043         .slave_changelink       = br_port_slave_changelink,
1044         .get_slave_size         = br_port_get_slave_size,
1045         .fill_slave_info        = br_port_fill_slave_info,
1046 };
1047
1048 int __init br_netlink_init(void)
1049 {
1050         int err;
1051
1052         br_mdb_init();
1053         rtnl_af_register(&br_af_ops);
1054
1055         err = rtnl_link_register(&br_link_ops);
1056         if (err)
1057                 goto out_af;
1058
1059         return 0;
1060
1061 out_af:
1062         rtnl_af_unregister(&br_af_ops);
1063         br_mdb_uninit();
1064         return err;
1065 }
1066
1067 void br_netlink_fini(void)
1068 {
1069         br_mdb_uninit();
1070         rtnl_af_unregister(&br_af_ops);
1071         rtnl_link_unregister(&br_link_ops);
1072 }