kernel/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 <net/switchdev.h>
  20 #include <uapi/linux/if_bridge.h>
  21
  22 #include "br_private.h"
  23 #include "br_private_stp.h"
  24
  25 static int br_get_num_vlan_infos(const struct net_port_vlans *pv,
  26                                  u32 filter_mask)
  27 {
  28         u16 vid_range_start = 0, vid_range_end = 0;
  29         u16 vid_range_flags = 0;
  30         u16 pvid, vid, flags;
  31         int num_vlans = 0;
  32
  33         if (filter_mask & RTEXT_FILTER_BRVLAN)
  34                 return pv->num_vlans;
  35
  36         if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
  37                 return 0;
  38
  39         /* Count number of vlan info's
  40          */
  41         pvid = br_get_pvid(pv);
  42         for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
  43                 flags = 0;
  44                 if (vid == pvid)
  45                         flags |= BRIDGE_VLAN_INFO_PVID;
  46
  47                 if (test_bit(vid, pv->untagged_bitmap))
  48                         flags |= BRIDGE_VLAN_INFO_UNTAGGED;
  49
  50                 if (vid_range_start == 0) {
  51                         goto initvars;
  52                 } else if ((vid - vid_range_end) == 1 &&
  53                         flags == vid_range_flags) {
  54                         vid_range_end = vid;
  55                         continue;
  56                 } else {
  57                         if ((vid_range_end - vid_range_start) > 0)
  58                                 num_vlans += 2;
  59                         else
  60                                 num_vlans += 1;
  61                 }
  62 initvars:
  63                 vid_range_start = vid;
  64                 vid_range_end = vid;
  65                 vid_range_flags = flags;
  66         }
  67
  68         if (vid_range_start != 0) {
  69                 if ((vid_range_end - vid_range_start) > 0)
  70                         num_vlans += 2;
  71                 else
  72                         num_vlans += 1;
  73         }
  74
  75         return num_vlans;
  76 }
  77
  78 static size_t br_get_link_af_size_filtered(const struct net_device *dev,
  79                                            u32 filter_mask)
  80 {
  81         struct net_port_vlans *pv;
  82         int num_vlan_infos;
  83
  84         rcu_read_lock();
  85         if (br_port_exists(dev))
  86                 pv = nbp_get_vlan_info(br_port_get_rcu(dev));
  87         else if (dev->priv_flags & IFF_EBRIDGE)
  88                 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
  89         else
  90                 pv = NULL;
  91         if (pv)
  92                 num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask);
  93         else
  94                 num_vlan_infos = 0;
  95         rcu_read_unlock();
  96
  97         if (!num_vlan_infos)
  98                 return 0;
  99
 100         /* Each VLAN is returned in bridge_vlan_info along with flags */
 101         return num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info));
 102 }
 103
 104 static inline size_t br_port_info_size(void)
 105 {
 106         return nla_total_size(1)        /* IFLA_BRPORT_STATE  */
 107                 + nla_total_size(2)     /* IFLA_BRPORT_PRIORITY */
 108                 + nla_total_size(4)     /* IFLA_BRPORT_COST */
 109                 + nla_total_size(1)     /* IFLA_BRPORT_MODE */
 110                 + nla_total_size(1)     /* IFLA_BRPORT_GUARD */
 111                 + nla_total_size(1)     /* IFLA_BRPORT_PROTECT */
 112                 + nla_total_size(1)     /* IFLA_BRPORT_FAST_LEAVE */
 113                 + nla_total_size(1)     /* IFLA_BRPORT_LEARNING */
 114                 + nla_total_size(1)     /* IFLA_BRPORT_UNICAST_FLOOD */
 115                 + nla_total_size(1)     /* IFLA_BRPORT_PROXYARP */
 116                 + nla_total_size(1)     /* IFLA_BRPORT_PROXYARP_WIFI */
 117                 + 0;
 118 }
 119
 120 static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
 121 {
 122         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 123                 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 124                 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 125                 + nla_total_size(4) /* IFLA_MASTER */
 126                 + nla_total_size(4) /* IFLA_MTU */
 127                 + nla_total_size(4) /* IFLA_LINK */
 128                 + nla_total_size(1) /* IFLA_OPERSTATE */
 129                 + nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */
 130                 + nla_total_size(br_get_link_af_size_filtered(dev,
 131                                  filter_mask)); /* IFLA_AF_SPEC */
 132 }
 133
 134 static int br_port_fill_attrs(struct sk_buff *skb,
 135                               const struct net_bridge_port *p)
 136 {
 137         u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
 138
 139         if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
 140             nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
 141             nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
 142             nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
 143             nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
 144             nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
 145             nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
 146             nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
 147             nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
 148             nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
 149             nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
 150                        !!(p->flags & BR_PROXYARP_WIFI)))
 151                 return -EMSGSIZE;
 152
 153         return 0;
 154 }
 155
 156 static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start,
 157                                     u16 vid_end, u16 flags)
 158 {
 159         struct  bridge_vlan_info vinfo;
 160
 161         if ((vid_end - vid_start) > 0) {
 162                 /* add range to skb */
 163                 vinfo.vid = vid_start;
 164                 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN;
 165                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 166                             sizeof(vinfo), &vinfo))
 167                         goto nla_put_failure;
 168
 169                 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
 170
 171                 vinfo.vid = vid_end;
 172                 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END;
 173                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 174                             sizeof(vinfo), &vinfo))
 175                         goto nla_put_failure;
 176         } else {
 177                 vinfo.vid = vid_start;
 178                 vinfo.flags = flags;
 179                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 180                             sizeof(vinfo), &vinfo))
 181                         goto nla_put_failure;
 182         }
 183
 184         return 0;
 185
 186 nla_put_failure:
 187         return -EMSGSIZE;
 188 }
 189
 190 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
 191                                          const struct net_port_vlans *pv)
 192 {
 193         u16 vid_range_start = 0, vid_range_end = 0;
 194         u16 vid_range_flags = 0;
 195         u16 pvid, vid, flags;
 196         int err = 0;
 197
 198         /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan
 199          * and mark vlan info with begin and end flags
 200          * if vlaninfo represents a range
 201          */
 202         pvid = br_get_pvid(pv);
 203         for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 204                 flags = 0;
 205                 if (vid == pvid)
 206                         flags |= BRIDGE_VLAN_INFO_PVID;
 207
 208                 if (test_bit(vid, pv->untagged_bitmap))
 209                         flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 210
 211                 if (vid_range_start == 0) {
 212                         goto initvars;
 213                 } else if ((vid - vid_range_end) == 1 &&
 214                         flags == vid_range_flags) {
 215                         vid_range_end = vid;
 216                         continue;
 217                 } else {
 218                         err = br_fill_ifvlaninfo_range(skb, vid_range_start,
 219                                                        vid_range_end,
 220                                                        vid_range_flags);
 221                         if (err)
 222                                 return err;
 223                 }
 224
 225 initvars:
 226                 vid_range_start = vid;
 227                 vid_range_end = vid;
 228                 vid_range_flags = flags;
 229         }
 230
 231         if (vid_range_start != 0) {
 232                 /* Call it once more to send any left over vlans */
 233                 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
 234                                                vid_range_end,
 235                                                vid_range_flags);
 236                 if (err)
 237                         return err;
 238         }
 239
 240         return 0;
 241 }
 242
 243 static int br_fill_ifvlaninfo(struct sk_buff *skb,
 244                               const struct net_port_vlans *pv)
 245 {
 246         struct bridge_vlan_info vinfo;
 247         u16 pvid, vid;
 248
 249         pvid = br_get_pvid(pv);
 250         for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 251                 vinfo.vid = vid;
 252                 vinfo.flags = 0;
 253                 if (vid == pvid)
 254                         vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
 255
 256                 if (test_bit(vid, pv->untagged_bitmap))
 257                         vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 258
 259                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 260                             sizeof(vinfo), &vinfo))
 261                         goto nla_put_failure;
 262         }
 263
 264         return 0;
 265
 266 nla_put_failure:
 267         return -EMSGSIZE;
 268 }
 269
 270 /*
 271  * Create one netlink message for one interface
 272  * Contains port and master info as well as carrier and bridge state.
 273  */
 274 static int br_fill_ifinfo(struct sk_buff *skb,
 275                           const struct net_bridge_port *port,
 276                           u32 pid, u32 seq, int event, unsigned int flags,
 277                           u32 filter_mask, const struct net_device *dev)
 278 {
 279         const struct net_bridge *br;
 280         struct ifinfomsg *hdr;
 281         struct nlmsghdr *nlh;
 282         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
 283
 284         if (port)
 285                 br = port->br;
 286         else
 287                 br = netdev_priv(dev);
 288
 289         br_debug(br, "br_fill_info event %d port %s master %s\n",
 290                      event, dev->name, br->dev->name);
 291
 292         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
 293         if (nlh == NULL)
 294                 return -EMSGSIZE;
 295
 296         hdr = nlmsg_data(nlh);
 297         hdr->ifi_family = AF_BRIDGE;
 298         hdr->__ifi_pad = 0;
 299         hdr->ifi_type = dev->type;
 300         hdr->ifi_index = dev->ifindex;
 301         hdr->ifi_flags = dev_get_flags(dev);
 302         hdr->ifi_change = 0;
 303
 304         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
 305             nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
 306             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 307             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
 308             (dev->addr_len &&
 309              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
 310             (dev->ifindex != dev_get_iflink(dev) &&
 311              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
 312                 goto nla_put_failure;
 313
 314         if (event == RTM_NEWLINK && port) {
 315                 struct nlattr *nest
 316                         = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
 317
 318                 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
 319                         goto nla_put_failure;
 320                 nla_nest_end(skb, nest);
 321         }
 322
 323         /* Check if  the VID information is requested */
 324         if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
 325             (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
 326                 const struct net_port_vlans *pv;
 327                 struct nlattr *af;
 328                 int err;
 329
 330                 if (port)
 331                         pv = nbp_get_vlan_info(port);
 332                 else
 333                         pv = br_get_vlan_info(br);
 334
 335                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
 336                         goto done;
 337
 338                 af = nla_nest_start(skb, IFLA_AF_SPEC);
 339                 if (!af)
 340                         goto nla_put_failure;
 341
 342                 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
 343                         err = br_fill_ifvlaninfo_compressed(skb, pv);
 344                 else
 345                         err = br_fill_ifvlaninfo(skb, pv);
 346                 if (err)
 347                         goto nla_put_failure;
 348                 nla_nest_end(skb, af);
 349         }
 350
 351 done:
 352         nlmsg_end(skb, nlh);
 353         return 0;
 354
 355 nla_put_failure:
 356         nlmsg_cancel(skb, nlh);
 357         return -EMSGSIZE;
 358 }
 359
 360 /*
 361  * Notify listeners of a change in port information
 362  */
 363 void br_ifinfo_notify(int event, struct net_bridge_port *port)
 364 {
 365         struct net *net;
 366         struct sk_buff *skb;
 367         int err = -ENOBUFS;
 368         u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
 369
 370         if (!port)
 371                 return;
 372
 373         net = dev_net(port->dev);
 374         br_debug(port->br, "port %u(%s) event %d\n",
 375                  (unsigned int)port->port_no, port->dev->name, event);
 376
 377         skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC);
 378         if (skb == NULL)
 379                 goto errout;
 380
 381         err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev);
 382         if (err < 0) {
 383                 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
 384                 WARN_ON(err == -EMSGSIZE);
 385                 kfree_skb(skb);
 386                 goto errout;
 387         }
 388         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
 389         return;
 390 errout:
 391         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 392 }
 393
 394
 395 /*
 396  * Dump information about all ports, in response to GETLINK
 397  */
 398 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 399                struct net_device *dev, u32 filter_mask, int nlflags)
 400 {
 401         struct net_bridge_port *port = br_port_get_rtnl(dev);
 402
 403         if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
 404             !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
 405                 return 0;
 406
 407         return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
 408                               filter_mask, dev);
 409 }
 410
 411 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
 412                         int cmd, struct bridge_vlan_info *vinfo)
 413 {
 414         int err = 0;
 415
 416         switch (cmd) {
 417         case RTM_SETLINK:
 418                 if (p) {
 419                         err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
 420                         if (err)
 421                                 break;
 422
 423                         if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 424                                 err = br_vlan_add(p->br, vinfo->vid,
 425                                                   vinfo->flags);
 426                 } else {
 427                         err = br_vlan_add(br, vinfo->vid, vinfo->flags);
 428                 }
 429                 break;
 430
 431         case RTM_DELLINK:
 432                 if (p) {
 433                         nbp_vlan_delete(p, vinfo->vid);
 434                         if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 435                                 br_vlan_delete(p->br, vinfo->vid);
 436                 } else {
 437                         br_vlan_delete(br, vinfo->vid);
 438                 }
 439                 break;
 440         }
 441
 442         return err;
 443 }
 444
 445 static int br_afspec(struct net_bridge *br,
 446                      struct net_bridge_port *p,
 447                      struct nlattr *af_spec,
 448                      int cmd)
 449 {
 450         struct bridge_vlan_info *vinfo_start = NULL;
 451         struct bridge_vlan_info *vinfo = NULL;
 452         struct nlattr *attr;
 453         int err = 0;
 454         int rem;
 455
 456         nla_for_each_nested(attr, af_spec, rem) {
 457                 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 458                         continue;
 459                 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 460                         return -EINVAL;
 461                 vinfo = nla_data(attr);
 462                 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 463                         if (vinfo_start)
 464                                 return -EINVAL;
 465                         vinfo_start = vinfo;
 466                         continue;
 467                 }
 468
 469                 if (vinfo_start) {
 470                         struct bridge_vlan_info tmp_vinfo;
 471                         int v;
 472
 473                         if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
 474                                 return -EINVAL;
 475
 476                         if (vinfo->vid <= vinfo_start->vid)
 477                                 return -EINVAL;
 478
 479                         memcpy(&tmp_vinfo, vinfo_start,
 480                                sizeof(struct bridge_vlan_info));
 481
 482                         for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
 483                                 tmp_vinfo.vid = v;
 484                                 err = br_vlan_info(br, p, cmd, &tmp_vinfo);
 485                                 if (err)
 486                                         break;
 487                         }
 488                         vinfo_start = NULL;
 489                 } else {
 490                         err = br_vlan_info(br, p, cmd, vinfo);
 491                 }
 492                 if (err)
 493                         break;
 494         }
 495
 496         return err;
 497 }
 498
 499 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
 500         [IFLA_BRPORT_STATE]     = { .type = NLA_U8 },
 501         [IFLA_BRPORT_COST]      = { .type = NLA_U32 },
 502         [IFLA_BRPORT_PRIORITY]  = { .type = NLA_U16 },
 503         [IFLA_BRPORT_MODE]      = { .type = NLA_U8 },
 504         [IFLA_BRPORT_GUARD]     = { .type = NLA_U8 },
 505         [IFLA_BRPORT_PROTECT]   = { .type = NLA_U8 },
 506         [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
 507         [IFLA_BRPORT_LEARNING]  = { .type = NLA_U8 },
 508         [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
 509         [IFLA_BRPORT_PROXYARP]  = { .type = NLA_U8 },
 510         [IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 },
 511 };
 512
 513 /* Change the state of the port and notify spanning tree */
 514 static int br_set_port_state(struct net_bridge_port *p, u8 state)
 515 {
 516         if (state > BR_STATE_BLOCKING)
 517                 return -EINVAL;
 518
 519         /* if kernel STP is running, don't allow changes */
 520         if (p->br->stp_enabled == BR_KERNEL_STP)
 521                 return -EBUSY;
 522
 523         /* if device is not up, change is not allowed
 524          * if link is not present, only allowable state is disabled
 525          */
 526         if (!netif_running(p->dev) ||
 527             (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
 528                 return -ENETDOWN;
 529
 530         br_set_state(p, state);
 531         br_log_state(p);
 532         br_port_state_selection(p->br);
 533         return 0;
 534 }
 535
 536 /* Set/clear or port flags based on attribute */
 537 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
 538                            int attrtype, unsigned long mask)
 539 {
 540         if (tb[attrtype]) {
 541                 u8 flag = nla_get_u8(tb[attrtype]);
 542                 if (flag)
 543                         p->flags |= mask;
 544                 else
 545                         p->flags &= ~mask;
 546         }
 547 }
 548
 549 /* Process bridge protocol info on port */
 550 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
 551 {
 552         int err;
 553         unsigned long old_flags = p->flags;
 554
 555         br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
 556         br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
 557         br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
 558         br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
 559         br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
 560         br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
 561         br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP);
 562         br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI);
 563
 564         if (tb[IFLA_BRPORT_COST]) {
 565                 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
 566                 if (err)
 567                         return err;
 568         }
 569
 570         if (tb[IFLA_BRPORT_PRIORITY]) {
 571                 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
 572                 if (err)
 573                         return err;
 574         }
 575
 576         if (tb[IFLA_BRPORT_STATE]) {
 577                 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
 578                 if (err)
 579                         return err;
 580         }
 581
 582         br_port_flags_change(p, old_flags ^ p->flags);
 583         return 0;
 584 }
 585
 586 /* Change state and parameters on port. */
 587 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 588 {
 589         struct nlattr *protinfo;
 590         struct nlattr *afspec;
 591         struct net_bridge_port *p;
 592         struct nlattr *tb[IFLA_BRPORT_MAX + 1];
 593         int err = 0, ret_offload = 0;
 594
 595         protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
 596         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 597         if (!protinfo && !afspec)
 598                 return 0;
 599
 600         p = br_port_get_rtnl(dev);
 601         /* We want to accept dev as bridge itself if the AF_SPEC
 602          * is set to see if someone is setting vlan info on the bridge
 603          */
 604         if (!p && !afspec)
 605                 return -EINVAL;
 606
 607         if (p && protinfo) {
 608                 if (protinfo->nla_type & NLA_F_NESTED) {
 609                         err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
 610                                                protinfo, br_port_policy);
 611                         if (err)
 612                                 return err;
 613
 614                         spin_lock_bh(&p->br->lock);
 615                         err = br_setport(p, tb);
 616                         spin_unlock_bh(&p->br->lock);
 617                 } else {
 618                         /* Binary compatibility with old RSTP */
 619                         if (nla_len(protinfo) < sizeof(u8))
 620                                 return -EINVAL;
 621
 622                         spin_lock_bh(&p->br->lock);
 623                         err = br_set_port_state(p, nla_get_u8(protinfo));
 624                         spin_unlock_bh(&p->br->lock);
 625                 }
 626                 if (err)
 627                         goto out;
 628         }
 629
 630         if (afspec) {
 631                 err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 632                                 afspec, RTM_SETLINK);
 633         }
 634
 635         if (p && !(flags & BRIDGE_FLAGS_SELF)) {
 636                 /* set bridge attributes in hardware if supported
 637                  */
 638                 ret_offload = netdev_switch_port_bridge_setlink(dev, nlh,
 639                                                                 flags);
 640                 if (ret_offload && ret_offload != -EOPNOTSUPP)
 641                         br_warn(p->br, "error setting attrs on port %u(%s)\n",
 642                                 (unsigned int)p->port_no, p->dev->name);
 643         }
 644
 645         if (err == 0)
 646                 br_ifinfo_notify(RTM_NEWLINK, p);
 647 out:
 648         return err;
 649 }
 650
 651 /* Delete port information */
 652 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 653 {
 654         struct nlattr *afspec;
 655         struct net_bridge_port *p;
 656         int err = 0, ret_offload = 0;
 657
 658         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 659         if (!afspec)
 660                 return 0;
 661
 662         p = br_port_get_rtnl(dev);
 663         /* We want to accept dev as bridge itself as well */
 664         if (!p && !(dev->priv_flags & IFF_EBRIDGE))
 665                 return -EINVAL;
 666
 667         err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 668                         afspec, RTM_DELLINK);
 669         if (err == 0)
 670                 /* Send RTM_NEWLINK because userspace
 671                  * expects RTM_NEWLINK for vlan dels
 672                  */
 673                 br_ifinfo_notify(RTM_NEWLINK, p);
 674
 675         if (p && !(flags & BRIDGE_FLAGS_SELF)) {
 676                 /* del bridge attributes in hardware
 677                  */
 678                 ret_offload = netdev_switch_port_bridge_dellink(dev, nlh,
 679                                                                 flags);
 680                 if (ret_offload && ret_offload != -EOPNOTSUPP)
 681                         br_warn(p->br, "error deleting attrs on port %u (%s)\n",
 682                                 (unsigned int)p->port_no, p->dev->name);
 683         }
 684
 685         return err;
 686 }
 687 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
 688 {
 689         if (tb[IFLA_ADDRESS]) {
 690                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 691                         return -EINVAL;
 692                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 693                         return -EADDRNOTAVAIL;
 694         }
 695
 696         return 0;
 697 }
 698
 699 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
 700                           struct nlattr *tb[], struct nlattr *data[])
 701 {
 702         struct net_bridge *br = netdev_priv(dev);
 703
 704         if (tb[IFLA_ADDRESS]) {
 705                 spin_lock_bh(&br->lock);
 706                 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
 707                 spin_unlock_bh(&br->lock);
 708         }
 709
 710         return register_netdevice(dev);
 711 }
 712
 713 static int br_port_slave_changelink(struct net_device *brdev,
 714                                     struct net_device *dev,
 715                                     struct nlattr *tb[],
 716                                     struct nlattr *data[])
 717 {
 718         struct net_bridge *br = netdev_priv(brdev);
 719         int ret;
 720
 721         if (!data)
 722                 return 0;
 723
 724         spin_lock_bh(&br->lock);
 725         ret = br_setport(br_port_get_rtnl(dev), data);
 726         spin_unlock_bh(&br->lock);
 727
 728         return ret;
 729 }
 730
 731 static int br_port_fill_slave_info(struct sk_buff *skb,
 732                                    const struct net_device *brdev,
 733                                    const struct net_device *dev)
 734 {
 735         return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
 736 }
 737
 738 static size_t br_port_get_slave_size(const struct net_device *brdev,
 739                                      const struct net_device *dev)
 740 {
 741         return br_port_info_size();
 742 }
 743
 744 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
 745         [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
 746         [IFLA_BR_HELLO_TIME]    = { .type = NLA_U32 },
 747         [IFLA_BR_MAX_AGE]       = { .type = NLA_U32 },
 748         [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 },
 749         [IFLA_BR_STP_STATE] = { .type = NLA_U32 },
 750         [IFLA_BR_PRIORITY] = { .type = NLA_U16 },
 751 };
 752
 753 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 754                          struct nlattr *data[])
 755 {
 756         struct net_bridge *br = netdev_priv(brdev);
 757         int err;
 758
 759         if (!data)
 760                 return 0;
 761
 762         if (data[IFLA_BR_FORWARD_DELAY]) {
 763                 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
 764                 if (err)
 765                         return err;
 766         }
 767
 768         if (data[IFLA_BR_HELLO_TIME]) {
 769                 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
 770                 if (err)
 771                         return err;
 772         }
 773
 774         if (data[IFLA_BR_MAX_AGE]) {
 775                 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
 776                 if (err)
 777                         return err;
 778         }
 779
 780         if (data[IFLA_BR_AGEING_TIME]) {
 781                 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]);
 782
 783                 br->ageing_time = clock_t_to_jiffies(ageing_time);
 784         }
 785
 786         if (data[IFLA_BR_STP_STATE]) {
 787                 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]);
 788
 789                 br_stp_set_enabled(br, stp_enabled);
 790         }
 791
 792         if (data[IFLA_BR_PRIORITY]) {
 793                 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]);
 794
 795                 br_stp_set_bridge_priority(br, priority);
 796         }
 797
 798         return 0;
 799 }
 800
 801 static size_t br_get_size(const struct net_device *brdev)
 802 {
 803         return nla_total_size(sizeof(u32)) +    /* IFLA_BR_FORWARD_DELAY  */
 804                nla_total_size(sizeof(u32)) +    /* IFLA_BR_HELLO_TIME */
 805                nla_total_size(sizeof(u32)) +    /* IFLA_BR_MAX_AGE */
 806                nla_total_size(sizeof(u32)) +    /* IFLA_BR_AGEING_TIME */
 807                nla_total_size(sizeof(u32)) +    /* IFLA_BR_STP_STATE */
 808                nla_total_size(sizeof(u16)) +    /* IFLA_BR_PRIORITY */
 809                0;
 810 }
 811
 812 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 813 {
 814         struct net_bridge *br = netdev_priv(brdev);
 815         u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
 816         u32 hello_time = jiffies_to_clock_t(br->hello_time);
 817         u32 age_time = jiffies_to_clock_t(br->max_age);
 818         u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
 819         u32 stp_enabled = br->stp_enabled;
 820         u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1];
 821
 822         if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
 823             nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
 824             nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) ||
 825             nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) ||
 826             nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) ||
 827             nla_put_u16(skb, IFLA_BR_PRIORITY, priority))
 828                 return -EMSGSIZE;
 829
 830         return 0;
 831 }
 832
 833 static size_t br_get_link_af_size(const struct net_device *dev)
 834 {
 835         struct net_port_vlans *pv;
 836
 837         if (br_port_exists(dev))
 838                 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
 839         else if (dev->priv_flags & IFF_EBRIDGE)
 840                 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
 841         else
 842                 return 0;
 843
 844         if (!pv)
 845                 return 0;
 846
 847         /* Each VLAN is returned in bridge_vlan_info along with flags */
 848         return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
 849 }
 850
 851 static struct rtnl_af_ops br_af_ops __read_mostly = {
 852         .family                 = AF_BRIDGE,
 853         .get_link_af_size       = br_get_link_af_size,
 854 };
 855
 856 struct rtnl_link_ops br_link_ops __read_mostly = {
 857         .kind                   = "bridge",
 858         .priv_size              = sizeof(struct net_bridge),
 859         .setup                  = br_dev_setup,
 860         .maxtype                = IFLA_BRPORT_MAX,
 861         .policy                 = br_policy,
 862         .validate               = br_validate,
 863         .newlink                = br_dev_newlink,
 864         .changelink             = br_changelink,
 865         .dellink                = br_dev_delete,
 866         .get_size               = br_get_size,
 867         .fill_info              = br_fill_info,
 868
 869         .slave_maxtype          = IFLA_BRPORT_MAX,
 870         .slave_policy           = br_port_policy,
 871         .slave_changelink       = br_port_slave_changelink,
 872         .get_slave_size         = br_port_get_slave_size,
 873         .fill_slave_info        = br_port_fill_slave_info,
 874 };
 875
 876 int __init br_netlink_init(void)
 877 {
 878         int err;
 879
 880         br_mdb_init();
 881         rtnl_af_register(&br_af_ops);
 882
 883         err = rtnl_link_register(&br_link_ops);
 884         if (err)
 885                 goto out_af;
 886
 887         return 0;
 888
 889 out_af:
 890         rtnl_af_unregister(&br_af_ops);
 891         br_mdb_uninit();
 892         return err;
 893 }
 894
 895 void br_netlink_fini(void)
 896 {
 897         br_mdb_uninit();
 898         rtnl_af_unregister(&br_af_ops);
 899         rtnl_link_unregister(&br_link_ops);
 900 }