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