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                 + 0;
 117 }
 118
 119 static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask)
 120 {
 121         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
 122                 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
 123                 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
 124                 + nla_total_size(4) /* IFLA_MASTER */
 125                 + nla_total_size(4) /* IFLA_MTU */
 126                 + nla_total_size(4) /* IFLA_LINK */
 127                 + nla_total_size(1) /* IFLA_OPERSTATE */
 128                 + nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */
 129                 + nla_total_size(br_get_link_af_size_filtered(dev,
 130                                  filter_mask)); /* IFLA_AF_SPEC */
 131 }
 132
 133 static int br_port_fill_attrs(struct sk_buff *skb,
 134                               const struct net_bridge_port *p)
 135 {
 136         u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
 137
 138         if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
 139             nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
 140             nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
 141             nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
 142             nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
 143             nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
 144             nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
 145             nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
 146             nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) ||
 147             nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) ||
 148             nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI,
 149                        !!(p->flags & BR_PROXYARP_WIFI)))
 150                 return -EMSGSIZE;
 151
 152         return 0;
 153 }
 154
 155 static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start,
 156                                     u16 vid_end, u16 flags)
 157 {
 158         struct  bridge_vlan_info vinfo;
 159
 160         if ((vid_end - vid_start) > 0) {
 161                 /* add range to skb */
 162                 vinfo.vid = vid_start;
 163                 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN;
 164                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 165                             sizeof(vinfo), &vinfo))
 166                         goto nla_put_failure;
 167
 168                 vinfo.flags &= ~BRIDGE_VLAN_INFO_RANGE_BEGIN;
 169
 170                 vinfo.vid = vid_end;
 171                 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END;
 172                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 173                             sizeof(vinfo), &vinfo))
 174                         goto nla_put_failure;
 175         } else {
 176                 vinfo.vid = vid_start;
 177                 vinfo.flags = flags;
 178                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 179                             sizeof(vinfo), &vinfo))
 180                         goto nla_put_failure;
 181         }
 182
 183         return 0;
 184
 185 nla_put_failure:
 186         return -EMSGSIZE;
 187 }
 188
 189 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb,
 190                                          const struct net_port_vlans *pv)
 191 {
 192         u16 vid_range_start = 0, vid_range_end = 0;
 193         u16 vid_range_flags = 0;
 194         u16 pvid, vid, flags;
 195         int err = 0;
 196
 197         /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan
 198          * and mark vlan info with begin and end flags
 199          * if vlaninfo represents a range
 200          */
 201         pvid = br_get_pvid(pv);
 202         for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 203                 flags = 0;
 204                 if (vid == pvid)
 205                         flags |= BRIDGE_VLAN_INFO_PVID;
 206
 207                 if (test_bit(vid, pv->untagged_bitmap))
 208                         flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 209
 210                 if (vid_range_start == 0) {
 211                         goto initvars;
 212                 } else if ((vid - vid_range_end) == 1 &&
 213                         flags == vid_range_flags) {
 214                         vid_range_end = vid;
 215                         continue;
 216                 } else {
 217                         err = br_fill_ifvlaninfo_range(skb, vid_range_start,
 218                                                        vid_range_end,
 219                                                        vid_range_flags);
 220                         if (err)
 221                                 return err;
 222                 }
 223
 224 initvars:
 225                 vid_range_start = vid;
 226                 vid_range_end = vid;
 227                 vid_range_flags = flags;
 228         }
 229
 230         if (vid_range_start != 0) {
 231                 /* Call it once more to send any left over vlans */
 232                 err = br_fill_ifvlaninfo_range(skb, vid_range_start,
 233                                                vid_range_end,
 234                                                vid_range_flags);
 235                 if (err)
 236                         return err;
 237         }
 238
 239         return 0;
 240 }
 241
 242 static int br_fill_ifvlaninfo(struct sk_buff *skb,
 243                               const struct net_port_vlans *pv)
 244 {
 245         struct bridge_vlan_info vinfo;
 246         u16 pvid, vid;
 247
 248         pvid = br_get_pvid(pv);
 249         for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
 250                 vinfo.vid = vid;
 251                 vinfo.flags = 0;
 252                 if (vid == pvid)
 253                         vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
 254
 255                 if (test_bit(vid, pv->untagged_bitmap))
 256                         vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;
 257
 258                 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
 259                             sizeof(vinfo), &vinfo))
 260                         goto nla_put_failure;
 261         }
 262
 263         return 0;
 264
 265 nla_put_failure:
 266         return -EMSGSIZE;
 267 }
 268
 269 /*
 270  * Create one netlink message for one interface
 271  * Contains port and master info as well as carrier and bridge state.
 272  */
 273 static int br_fill_ifinfo(struct sk_buff *skb,
 274                           const struct net_bridge_port *port,
 275                           u32 pid, u32 seq, int event, unsigned int flags,
 276                           u32 filter_mask, const struct net_device *dev)
 277 {
 278         const struct net_bridge *br;
 279         struct ifinfomsg *hdr;
 280         struct nlmsghdr *nlh;
 281         u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
 282
 283         if (port)
 284                 br = port->br;
 285         else
 286                 br = netdev_priv(dev);
 287
 288         br_debug(br, "br_fill_info event %d port %s master %s\n",
 289                      event, dev->name, br->dev->name);
 290
 291         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
 292         if (nlh == NULL)
 293                 return -EMSGSIZE;
 294
 295         hdr = nlmsg_data(nlh);
 296         hdr->ifi_family = AF_BRIDGE;
 297         hdr->__ifi_pad = 0;
 298         hdr->ifi_type = dev->type;
 299         hdr->ifi_index = dev->ifindex;
 300         hdr->ifi_flags = dev_get_flags(dev);
 301         hdr->ifi_change = 0;
 302
 303         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
 304             nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
 305             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
 306             nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
 307             (dev->addr_len &&
 308              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
 309             (dev->ifindex != dev_get_iflink(dev) &&
 310              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
 311                 goto nla_put_failure;
 312
 313         if (event == RTM_NEWLINK && port) {
 314                 struct nlattr *nest
 315                         = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);
 316
 317                 if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
 318                         goto nla_put_failure;
 319                 nla_nest_end(skb, nest);
 320         }
 321
 322         /* Check if  the VID information is requested */
 323         if ((filter_mask & RTEXT_FILTER_BRVLAN) ||
 324             (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) {
 325                 const struct net_port_vlans *pv;
 326                 struct nlattr *af;
 327                 int err;
 328
 329                 if (port)
 330                         pv = nbp_get_vlan_info(port);
 331                 else
 332                         pv = br_get_vlan_info(br);
 333
 334                 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
 335                         goto done;
 336
 337                 af = nla_nest_start(skb, IFLA_AF_SPEC);
 338                 if (!af)
 339                         goto nla_put_failure;
 340
 341                 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)
 342                         err = br_fill_ifvlaninfo_compressed(skb, pv);
 343                 else
 344                         err = br_fill_ifvlaninfo(skb, pv);
 345                 if (err)
 346                         goto nla_put_failure;
 347                 nla_nest_end(skb, af);
 348         }
 349
 350 done:
 351         nlmsg_end(skb, nlh);
 352         return 0;
 353
 354 nla_put_failure:
 355         nlmsg_cancel(skb, nlh);
 356         return -EMSGSIZE;
 357 }
 358
 359 /*
 360  * Notify listeners of a change in port information
 361  */
 362 void br_ifinfo_notify(int event, struct net_bridge_port *port)
 363 {
 364         struct net *net;
 365         struct sk_buff *skb;
 366         int err = -ENOBUFS;
 367         u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED;
 368
 369         if (!port)
 370                 return;
 371
 372         net = dev_net(port->dev);
 373         br_debug(port->br, "port %u(%s) event %d\n",
 374                  (unsigned int)port->port_no, port->dev->name, event);
 375
 376         skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC);
 377         if (skb == NULL)
 378                 goto errout;
 379
 380         err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev);
 381         if (err < 0) {
 382                 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
 383                 WARN_ON(err == -EMSGSIZE);
 384                 kfree_skb(skb);
 385                 goto errout;
 386         }
 387         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
 388         return;
 389 errout:
 390         rtnl_set_sk_err(net, RTNLGRP_LINK, err);
 391 }
 392
 393
 394 /*
 395  * Dump information about all ports, in response to GETLINK
 396  */
 397 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
 398                struct net_device *dev, u32 filter_mask, int nlflags)
 399 {
 400         struct net_bridge_port *port = br_port_get_rtnl(dev);
 401
 402         if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) &&
 403             !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED))
 404                 return 0;
 405
 406         return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags,
 407                               filter_mask, dev);
 408 }
 409
 410 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p,
 411                         int cmd, struct bridge_vlan_info *vinfo)
 412 {
 413         int err = 0;
 414
 415         switch (cmd) {
 416         case RTM_SETLINK:
 417                 if (p) {
 418                         err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
 419                         if (err)
 420                                 break;
 421
 422                         if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 423                                 err = br_vlan_add(p->br, vinfo->vid,
 424                                                   vinfo->flags);
 425                 } else {
 426                         err = br_vlan_add(br, vinfo->vid, vinfo->flags);
 427                 }
 428                 break;
 429
 430         case RTM_DELLINK:
 431                 if (p) {
 432                         nbp_vlan_delete(p, vinfo->vid);
 433                         if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
 434                                 br_vlan_delete(p->br, vinfo->vid);
 435                 } else {
 436                         br_vlan_delete(br, vinfo->vid);
 437                 }
 438                 break;
 439         }
 440
 441         return err;
 442 }
 443
 444 static int br_afspec(struct net_bridge *br,
 445                      struct net_bridge_port *p,
 446                      struct nlattr *af_spec,
 447                      int cmd)
 448 {
 449         struct bridge_vlan_info *vinfo_start = NULL;
 450         struct bridge_vlan_info *vinfo = NULL;
 451         struct nlattr *attr;
 452         int err = 0;
 453         int rem;
 454
 455         nla_for_each_nested(attr, af_spec, rem) {
 456                 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
 457                         continue;
 458                 if (nla_len(attr) != sizeof(struct bridge_vlan_info))
 459                         return -EINVAL;
 460                 vinfo = nla_data(attr);
 461                 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
 462                         return -EINVAL;
 463                 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
 464                         if (vinfo_start)
 465                                 return -EINVAL;
 466                         vinfo_start = vinfo;
 467                         continue;
 468                 }
 469
 470                 if (vinfo_start) {
 471                         struct bridge_vlan_info tmp_vinfo;
 472                         int v;
 473
 474                         if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END))
 475                                 return -EINVAL;
 476
 477                         if (vinfo->vid <= vinfo_start->vid)
 478                                 return -EINVAL;
 479
 480                         memcpy(&tmp_vinfo, vinfo_start,
 481                                sizeof(struct bridge_vlan_info));
 482
 483                         for (v = vinfo_start->vid; v <= vinfo->vid; v++) {
 484                                 tmp_vinfo.vid = v;
 485                                 err = br_vlan_info(br, p, cmd, &tmp_vinfo);
 486                                 if (err)
 487                                         break;
 488                         }
 489                         vinfo_start = NULL;
 490                 } else {
 491                         err = br_vlan_info(br, p, cmd, vinfo);
 492                 }
 493                 if (err)
 494                         break;
 495         }
 496
 497         return err;
 498 }
 499
 500 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
 501         [IFLA_BRPORT_STATE]     = { .type = NLA_U8 },
 502         [IFLA_BRPORT_COST]      = { .type = NLA_U32 },
 503         [IFLA_BRPORT_PRIORITY]  = { .type = NLA_U16 },
 504         [IFLA_BRPORT_MODE]      = { .type = NLA_U8 },
 505         [IFLA_BRPORT_GUARD]     = { .type = NLA_U8 },
 506         [IFLA_BRPORT_PROTECT]   = { .type = NLA_U8 },
 507         [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
 508         [IFLA_BRPORT_LEARNING]  = { .type = NLA_U8 },
 509         [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
 510         [IFLA_BRPORT_PROXYARP]  = { .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;
 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 (err == 0)
 636                 br_ifinfo_notify(RTM_NEWLINK, p);
 637 out:
 638         return err;
 639 }
 640
 641 /* Delete port information */
 642 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags)
 643 {
 644         struct nlattr *afspec;
 645         struct net_bridge_port *p;
 646         int err = 0;
 647
 648         afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
 649         if (!afspec)
 650                 return 0;
 651
 652         p = br_port_get_rtnl(dev);
 653         /* We want to accept dev as bridge itself as well */
 654         if (!p && !(dev->priv_flags & IFF_EBRIDGE))
 655                 return -EINVAL;
 656
 657         err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
 658                         afspec, RTM_DELLINK);
 659         if (err == 0)
 660                 /* Send RTM_NEWLINK because userspace
 661                  * expects RTM_NEWLINK for vlan dels
 662                  */
 663                 br_ifinfo_notify(RTM_NEWLINK, p);
 664
 665         return err;
 666 }
 667 static int br_validate(struct nlattr *tb[], struct nlattr *data[])
 668 {
 669         if (tb[IFLA_ADDRESS]) {
 670                 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
 671                         return -EINVAL;
 672                 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
 673                         return -EADDRNOTAVAIL;
 674         }
 675
 676         return 0;
 677 }
 678
 679 static int br_dev_newlink(struct net *src_net, struct net_device *dev,
 680                           struct nlattr *tb[], struct nlattr *data[])
 681 {
 682         struct net_bridge *br = netdev_priv(dev);
 683
 684         if (tb[IFLA_ADDRESS]) {
 685                 spin_lock_bh(&br->lock);
 686                 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
 687                 spin_unlock_bh(&br->lock);
 688         }
 689
 690         return register_netdevice(dev);
 691 }
 692
 693 static int br_port_slave_changelink(struct net_device *brdev,
 694                                     struct net_device *dev,
 695                                     struct nlattr *tb[],
 696                                     struct nlattr *data[])
 697 {
 698         struct net_bridge *br = netdev_priv(brdev);
 699         int ret;
 700
 701         if (!data)
 702                 return 0;
 703
 704         spin_lock_bh(&br->lock);
 705         ret = br_setport(br_port_get_rtnl(dev), data);
 706         spin_unlock_bh(&br->lock);
 707
 708         return ret;
 709 }
 710
 711 static int br_port_fill_slave_info(struct sk_buff *skb,
 712                                    const struct net_device *brdev,
 713                                    const struct net_device *dev)
 714 {
 715         return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
 716 }
 717
 718 static size_t br_port_get_slave_size(const struct net_device *brdev,
 719                                      const struct net_device *dev)
 720 {
 721         return br_port_info_size();
 722 }
 723
 724 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
 725         [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
 726         [IFLA_BR_HELLO_TIME]    = { .type = NLA_U32 },
 727         [IFLA_BR_MAX_AGE]       = { .type = NLA_U32 },
 728         [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 },
 729         [IFLA_BR_STP_STATE] = { .type = NLA_U32 },
 730         [IFLA_BR_PRIORITY] = { .type = NLA_U16 },
 731 };
 732
 733 static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
 734                          struct nlattr *data[])
 735 {
 736         struct net_bridge *br = netdev_priv(brdev);
 737         int err;
 738
 739         if (!data)
 740                 return 0;
 741
 742         if (data[IFLA_BR_FORWARD_DELAY]) {
 743                 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
 744                 if (err)
 745                         return err;
 746         }
 747
 748         if (data[IFLA_BR_HELLO_TIME]) {
 749                 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
 750                 if (err)
 751                         return err;
 752         }
 753
 754         if (data[IFLA_BR_MAX_AGE]) {
 755                 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
 756                 if (err)
 757                         return err;
 758         }
 759
 760         if (data[IFLA_BR_AGEING_TIME]) {
 761                 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]);
 762
 763                 br->ageing_time = clock_t_to_jiffies(ageing_time);
 764         }
 765
 766         if (data[IFLA_BR_STP_STATE]) {
 767                 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]);
 768
 769                 br_stp_set_enabled(br, stp_enabled);
 770         }
 771
 772         if (data[IFLA_BR_PRIORITY]) {
 773                 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]);
 774
 775                 br_stp_set_bridge_priority(br, priority);
 776         }
 777
 778         return 0;
 779 }
 780
 781 static size_t br_get_size(const struct net_device *brdev)
 782 {
 783         return nla_total_size(sizeof(u32)) +    /* IFLA_BR_FORWARD_DELAY  */
 784                nla_total_size(sizeof(u32)) +    /* IFLA_BR_HELLO_TIME */
 785                nla_total_size(sizeof(u32)) +    /* IFLA_BR_MAX_AGE */
 786                nla_total_size(sizeof(u32)) +    /* IFLA_BR_AGEING_TIME */
 787                nla_total_size(sizeof(u32)) +    /* IFLA_BR_STP_STATE */
 788                nla_total_size(sizeof(u16)) +    /* IFLA_BR_PRIORITY */
 789                0;
 790 }
 791
 792 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
 793 {
 794         struct net_bridge *br = netdev_priv(brdev);
 795         u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
 796         u32 hello_time = jiffies_to_clock_t(br->hello_time);
 797         u32 age_time = jiffies_to_clock_t(br->max_age);
 798         u32 ageing_time = jiffies_to_clock_t(br->ageing_time);
 799         u32 stp_enabled = br->stp_enabled;
 800         u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1];
 801
 802         if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
 803             nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
 804             nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) ||
 805             nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) ||
 806             nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) ||
 807             nla_put_u16(skb, IFLA_BR_PRIORITY, priority))
 808                 return -EMSGSIZE;
 809
 810         return 0;
 811 }
 812
 813 static size_t br_get_link_af_size(const struct net_device *dev)
 814 {
 815         struct net_port_vlans *pv;
 816
 817         if (br_port_exists(dev))
 818                 pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
 819         else if (dev->priv_flags & IFF_EBRIDGE)
 820                 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
 821         else
 822                 return 0;
 823
 824         if (!pv)
 825                 return 0;
 826
 827         /* Each VLAN is returned in bridge_vlan_info along with flags */
 828         return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
 829 }
 830
 831 static struct rtnl_af_ops br_af_ops __read_mostly = {
 832         .family                 = AF_BRIDGE,
 833         .get_link_af_size       = br_get_link_af_size,
 834 };
 835
 836 struct rtnl_link_ops br_link_ops __read_mostly = {
 837         .kind                   = "bridge",
 838         .priv_size              = sizeof(struct net_bridge),
 839         .setup                  = br_dev_setup,
 840         .maxtype                = IFLA_BRPORT_MAX,
 841         .policy                 = br_policy,
 842         .validate               = br_validate,
 843         .newlink                = br_dev_newlink,
 844         .changelink             = br_changelink,
 845         .dellink                = br_dev_delete,
 846         .get_size               = br_get_size,
 847         .fill_info              = br_fill_info,
 848
 849         .slave_maxtype          = IFLA_BRPORT_MAX,
 850         .slave_policy           = br_port_policy,
 851         .slave_changelink       = br_port_slave_changelink,
 852         .get_slave_size         = br_port_get_slave_size,
 853         .fill_slave_info        = br_port_fill_slave_info,
 854 };
 855
 856 int __init br_netlink_init(void)
 857 {
 858         int err;
 859
 860         br_mdb_init();
 861         rtnl_af_register(&br_af_ops);
 862
 863         err = rtnl_link_register(&br_link_ops);
 864         if (err)
 865                 goto out_af;
 866
 867         return 0;
 868
 869 out_af:
 870         rtnl_af_unregister(&br_af_ops);
 871         br_mdb_uninit();
 872         return err;
 873 }
 874
 875 void br_netlink_fini(void)
 876 {
 877         br_mdb_uninit();
 878         rtnl_af_unregister(&br_af_ops);
 879         rtnl_link_unregister(&br_link_ops);
 880 }