1 /* 2 * Bridge netlink control interface 3 * 4 * Authors: 5 * Stephen Hemminger <shemminger@osdl.org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/etherdevice.h> 16 #include <net/rtnetlink.h> 17 #include <net/net_namespace.h> 18 #include <net/sock.h> 19 #include <uapi/linux/if_bridge.h> 20 21 #include "br_private.h" 22 #include "br_private_stp.h" 23 24 static int br_get_num_vlan_infos(const struct net_port_vlans *pv, 25 u32 filter_mask) 26 { 27 u16 vid_range_start = 0, vid_range_end = 0; 28 u16 vid_range_flags = 0; 29 u16 pvid, vid, flags; 30 int num_vlans = 0; 31 32 if (filter_mask & RTEXT_FILTER_BRVLAN) 33 return pv->num_vlans; 34 35 if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) 36 return 0; 37 38 /* Count number of vlan info's 39 */ 40 pvid = br_get_pvid(pv); 41 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { 42 flags = 0; 43 if (vid == pvid) 44 flags |= BRIDGE_VLAN_INFO_PVID; 45 46 if (test_bit(vid, pv->untagged_bitmap)) 47 flags |= BRIDGE_VLAN_INFO_UNTAGGED; 48 49 if (vid_range_start == 0) { 50 goto initvars; 51 } else if ((vid - vid_range_end) == 1 && 52 flags == vid_range_flags) { 53 vid_range_end = vid; 54 continue; 55 } else { 56 if ((vid_range_end - vid_range_start) > 0) 57 num_vlans += 2; 58 else 59 num_vlans += 1; 60 } 61 initvars: 62 vid_range_start = vid; 63 vid_range_end = vid; 64 vid_range_flags = flags; 65 } 66 67 if (vid_range_start != 0) { 68 if ((vid_range_end - vid_range_start) > 0) 69 num_vlans += 2; 70 else 71 num_vlans += 1; 72 } 73 74 return num_vlans; 75 } 76 77 static size_t br_get_link_af_size_filtered(const struct net_device *dev, 78 u32 filter_mask) 79 { 80 struct net_port_vlans *pv; 81 int num_vlan_infos; 82 83 rcu_read_lock(); 84 if (br_port_exists(dev)) 85 pv = nbp_get_vlan_info(br_port_get_rcu(dev)); 86 else if (dev->priv_flags & IFF_EBRIDGE) 87 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev)); 88 else 89 pv = NULL; 90 if (pv) 91 num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask); 92 else 93 num_vlan_infos = 0; 94 rcu_read_unlock(); 95 96 if (!num_vlan_infos) 97 return 0; 98 99 /* Each VLAN is returned in bridge_vlan_info along with flags */ 100 return num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info)); 101 } 102 103 static inline size_t br_port_info_size(void) 104 { 105 return nla_total_size(1) /* IFLA_BRPORT_STATE */ 106 + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */ 107 + nla_total_size(4) /* IFLA_BRPORT_COST */ 108 + nla_total_size(1) /* IFLA_BRPORT_MODE */ 109 + nla_total_size(1) /* IFLA_BRPORT_GUARD */ 110 + nla_total_size(1) /* IFLA_BRPORT_PROTECT */ 111 + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */ 112 + nla_total_size(1) /* IFLA_BRPORT_LEARNING */ 113 + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */ 114 + nla_total_size(1) /* IFLA_BRPORT_PROXYARP */ 115 + nla_total_size(1) /* IFLA_BRPORT_PROXYARP_WIFI */ 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.vid = vid_end; 169 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END; 170 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, 171 sizeof(vinfo), &vinfo)) 172 goto nla_put_failure; 173 } else { 174 vinfo.vid = vid_start; 175 vinfo.flags = flags; 176 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, 177 sizeof(vinfo), &vinfo)) 178 goto nla_put_failure; 179 } 180 181 return 0; 182 183 nla_put_failure: 184 return -EMSGSIZE; 185 } 186 187 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb, 188 const struct net_port_vlans *pv) 189 { 190 u16 vid_range_start = 0, vid_range_end = 0; 191 u16 vid_range_flags = 0; 192 u16 pvid, vid, flags; 193 int err = 0; 194 195 /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan 196 * and mark vlan info with begin and end flags 197 * if vlaninfo represents a range 198 */ 199 pvid = br_get_pvid(pv); 200 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { 201 flags = 0; 202 if (vid == pvid) 203 flags |= BRIDGE_VLAN_INFO_PVID; 204 205 if (test_bit(vid, pv->untagged_bitmap)) 206 flags |= BRIDGE_VLAN_INFO_UNTAGGED; 207 208 if (vid_range_start == 0) { 209 goto initvars; 210 } else if ((vid - vid_range_end) == 1 && 211 flags == vid_range_flags) { 212 vid_range_end = vid; 213 continue; 214 } else { 215 err = br_fill_ifvlaninfo_range(skb, vid_range_start, 216 vid_range_end, 217 vid_range_flags); 218 if (err) 219 return err; 220 } 221 222 initvars: 223 vid_range_start = vid; 224 vid_range_end = vid; 225 vid_range_flags = flags; 226 } 227 228 if (vid_range_start != 0) { 229 /* Call it once more to send any left over vlans */ 230 err = br_fill_ifvlaninfo_range(skb, vid_range_start, 231 vid_range_end, 232 vid_range_flags); 233 if (err) 234 return err; 235 } 236 237 return 0; 238 } 239 240 static int br_fill_ifvlaninfo(struct sk_buff *skb, 241 const struct net_port_vlans *pv) 242 { 243 struct bridge_vlan_info vinfo; 244 u16 pvid, vid; 245 246 pvid = br_get_pvid(pv); 247 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { 248 vinfo.vid = vid; 249 vinfo.flags = 0; 250 if (vid == pvid) 251 vinfo.flags |= BRIDGE_VLAN_INFO_PVID; 252 253 if (test_bit(vid, pv->untagged_bitmap)) 254 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED; 255 256 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, 257 sizeof(vinfo), &vinfo)) 258 goto nla_put_failure; 259 } 260 261 return 0; 262 263 nla_put_failure: 264 return -EMSGSIZE; 265 } 266 267 /* 268 * Create one netlink message for one interface 269 * Contains port and master info as well as carrier and bridge state. 270 */ 271 static int br_fill_ifinfo(struct sk_buff *skb, 272 const struct net_bridge_port *port, 273 u32 pid, u32 seq, int event, unsigned int flags, 274 u32 filter_mask, const struct net_device *dev) 275 { 276 const struct net_bridge *br; 277 struct ifinfomsg *hdr; 278 struct nlmsghdr *nlh; 279 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 280 281 if (port) 282 br = port->br; 283 else 284 br = netdev_priv(dev); 285 286 br_debug(br, "br_fill_info event %d port %s master %s\n", 287 event, dev->name, br->dev->name); 288 289 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 290 if (nlh == NULL) 291 return -EMSGSIZE; 292 293 hdr = nlmsg_data(nlh); 294 hdr->ifi_family = AF_BRIDGE; 295 hdr->__ifi_pad = 0; 296 hdr->ifi_type = dev->type; 297 hdr->ifi_index = dev->ifindex; 298 hdr->ifi_flags = dev_get_flags(dev); 299 hdr->ifi_change = 0; 300 301 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 302 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) || 303 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 304 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 305 (dev->addr_len && 306 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 307 (dev->ifindex != dev_get_iflink(dev) && 308 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 309 goto nla_put_failure; 310 311 if (event == RTM_NEWLINK && port) { 312 struct nlattr *nest 313 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 314 315 if (nest == NULL || br_port_fill_attrs(skb, port) < 0) 316 goto nla_put_failure; 317 nla_nest_end(skb, nest); 318 } 319 320 /* Check if the VID information is requested */ 321 if ((filter_mask & RTEXT_FILTER_BRVLAN) || 322 (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) { 323 const struct net_port_vlans *pv; 324 struct nlattr *af; 325 int err; 326 327 if (port) 328 pv = nbp_get_vlan_info(port); 329 else 330 pv = br_get_vlan_info(br); 331 332 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) 333 goto done; 334 335 af = nla_nest_start(skb, IFLA_AF_SPEC); 336 if (!af) 337 goto nla_put_failure; 338 339 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) 340 err = br_fill_ifvlaninfo_compressed(skb, pv); 341 else 342 err = br_fill_ifvlaninfo(skb, pv); 343 if (err) 344 goto nla_put_failure; 345 nla_nest_end(skb, af); 346 } 347 348 done: 349 nlmsg_end(skb, nlh); 350 return 0; 351 352 nla_put_failure: 353 nlmsg_cancel(skb, nlh); 354 return -EMSGSIZE; 355 } 356 357 /* 358 * Notify listeners of a change in port information 359 */ 360 void br_ifinfo_notify(int event, struct net_bridge_port *port) 361 { 362 struct net *net; 363 struct sk_buff *skb; 364 int err = -ENOBUFS; 365 u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED; 366 367 if (!port) 368 return; 369 370 net = dev_net(port->dev); 371 br_debug(port->br, "port %u(%s) event %d\n", 372 (unsigned int)port->port_no, port->dev->name, event); 373 374 skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC); 375 if (skb == NULL) 376 goto errout; 377 378 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev); 379 if (err < 0) { 380 /* -EMSGSIZE implies BUG in br_nlmsg_size() */ 381 WARN_ON(err == -EMSGSIZE); 382 kfree_skb(skb); 383 goto errout; 384 } 385 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 386 return; 387 errout: 388 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 389 } 390 391 392 /* 393 * Dump information about all ports, in response to GETLINK 394 */ 395 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, 396 struct net_device *dev, u32 filter_mask, int nlflags) 397 { 398 struct net_bridge_port *port = br_port_get_rtnl(dev); 399 400 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) && 401 !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) 402 return 0; 403 404 return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags, 405 filter_mask, dev); 406 } 407 408 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p, 409 int cmd, struct bridge_vlan_info *vinfo) 410 { 411 int err = 0; 412 413 switch (cmd) { 414 case RTM_SETLINK: 415 if (p) { 416 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags); 417 if (err) 418 break; 419 420 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) 421 err = br_vlan_add(p->br, vinfo->vid, 422 vinfo->flags); 423 } else { 424 err = br_vlan_add(br, vinfo->vid, vinfo->flags); 425 } 426 break; 427 428 case RTM_DELLINK: 429 if (p) { 430 nbp_vlan_delete(p, vinfo->vid); 431 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) 432 br_vlan_delete(p->br, vinfo->vid); 433 } else { 434 br_vlan_delete(br, vinfo->vid); 435 } 436 break; 437 } 438 439 return err; 440 } 441 442 static int br_afspec(struct net_bridge *br, 443 struct net_bridge_port *p, 444 struct nlattr *af_spec, 445 int cmd) 446 { 447 struct bridge_vlan_info *vinfo_start = NULL; 448 struct bridge_vlan_info *vinfo = NULL; 449 struct nlattr *attr; 450 int err = 0; 451 int rem; 452 453 nla_for_each_nested(attr, af_spec, rem) { 454 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO) 455 continue; 456 if (nla_len(attr) != sizeof(struct bridge_vlan_info)) 457 return -EINVAL; 458 vinfo = nla_data(attr); 459 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK) 460 return -EINVAL; 461 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) { 462 if (vinfo_start) 463 return -EINVAL; 464 vinfo_start = vinfo; 465 continue; 466 } 467 468 if (vinfo_start) { 469 struct bridge_vlan_info tmp_vinfo; 470 int v; 471 472 if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END)) 473 return -EINVAL; 474 475 if (vinfo->vid <= vinfo_start->vid) 476 return -EINVAL; 477 478 memcpy(&tmp_vinfo, vinfo_start, 479 sizeof(struct bridge_vlan_info)); 480 481 for (v = vinfo_start->vid; v <= vinfo->vid; v++) { 482 tmp_vinfo.vid = v; 483 err = br_vlan_info(br, p, cmd, &tmp_vinfo); 484 if (err) 485 break; 486 } 487 vinfo_start = NULL; 488 } else { 489 err = br_vlan_info(br, p, cmd, vinfo); 490 } 491 if (err) 492 break; 493 } 494 495 return err; 496 } 497 498 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = { 499 [IFLA_BRPORT_STATE] = { .type = NLA_U8 }, 500 [IFLA_BRPORT_COST] = { .type = NLA_U32 }, 501 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 }, 502 [IFLA_BRPORT_MODE] = { .type = NLA_U8 }, 503 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 }, 504 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 }, 505 [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 }, 506 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 }, 507 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 }, 508 [IFLA_BRPORT_PROXYARP] = { .type = NLA_U8 }, 509 [IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 }, 510 }; 511 512 /* Change the state of the port and notify spanning tree */ 513 static int br_set_port_state(struct net_bridge_port *p, u8 state) 514 { 515 if (state > BR_STATE_BLOCKING) 516 return -EINVAL; 517 518 /* if kernel STP is running, don't allow changes */ 519 if (p->br->stp_enabled == BR_KERNEL_STP) 520 return -EBUSY; 521 522 /* if device is not up, change is not allowed 523 * if link is not present, only allowable state is disabled 524 */ 525 if (!netif_running(p->dev) || 526 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED)) 527 return -ENETDOWN; 528 529 br_set_state(p, state); 530 br_log_state(p); 531 br_port_state_selection(p->br); 532 return 0; 533 } 534 535 /* Set/clear or port flags based on attribute */ 536 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[], 537 int attrtype, unsigned long mask) 538 { 539 if (tb[attrtype]) { 540 u8 flag = nla_get_u8(tb[attrtype]); 541 if (flag) 542 p->flags |= mask; 543 else 544 p->flags &= ~mask; 545 } 546 } 547 548 /* Process bridge protocol info on port */ 549 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[]) 550 { 551 int err; 552 unsigned long old_flags = p->flags; 553 554 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE); 555 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD); 556 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE); 557 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK); 558 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING); 559 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD); 560 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP); 561 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI); 562 563 if (tb[IFLA_BRPORT_COST]) { 564 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST])); 565 if (err) 566 return err; 567 } 568 569 if (tb[IFLA_BRPORT_PRIORITY]) { 570 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY])); 571 if (err) 572 return err; 573 } 574 575 if (tb[IFLA_BRPORT_STATE]) { 576 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE])); 577 if (err) 578 return err; 579 } 580 581 br_port_flags_change(p, old_flags ^ p->flags); 582 return 0; 583 } 584 585 /* Change state and parameters on port. */ 586 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags) 587 { 588 struct nlattr *protinfo; 589 struct nlattr *afspec; 590 struct net_bridge_port *p; 591 struct nlattr *tb[IFLA_BRPORT_MAX + 1]; 592 int err = 0; 593 594 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO); 595 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 596 if (!protinfo && !afspec) 597 return 0; 598 599 p = br_port_get_rtnl(dev); 600 /* We want to accept dev as bridge itself if the AF_SPEC 601 * is set to see if someone is setting vlan info on the bridge 602 */ 603 if (!p && !afspec) 604 return -EINVAL; 605 606 if (p && protinfo) { 607 if (protinfo->nla_type & NLA_F_NESTED) { 608 err = nla_parse_nested(tb, IFLA_BRPORT_MAX, 609 protinfo, br_port_policy); 610 if (err) 611 return err; 612 613 spin_lock_bh(&p->br->lock); 614 err = br_setport(p, tb); 615 spin_unlock_bh(&p->br->lock); 616 } else { 617 /* Binary compatibility with old RSTP */ 618 if (nla_len(protinfo) < sizeof(u8)) 619 return -EINVAL; 620 621 spin_lock_bh(&p->br->lock); 622 err = br_set_port_state(p, nla_get_u8(protinfo)); 623 spin_unlock_bh(&p->br->lock); 624 } 625 if (err) 626 goto out; 627 } 628 629 if (afspec) { 630 err = br_afspec((struct net_bridge *)netdev_priv(dev), p, 631 afspec, RTM_SETLINK); 632 } 633 634 if (err == 0) 635 br_ifinfo_notify(RTM_NEWLINK, p); 636 out: 637 return err; 638 } 639 640 /* Delete port information */ 641 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags) 642 { 643 struct nlattr *afspec; 644 struct net_bridge_port *p; 645 int err = 0; 646 647 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 648 if (!afspec) 649 return 0; 650 651 p = br_port_get_rtnl(dev); 652 /* We want to accept dev as bridge itself as well */ 653 if (!p && !(dev->priv_flags & IFF_EBRIDGE)) 654 return -EINVAL; 655 656 err = br_afspec((struct net_bridge *)netdev_priv(dev), p, 657 afspec, RTM_DELLINK); 658 if (err == 0) 659 /* Send RTM_NEWLINK because userspace 660 * expects RTM_NEWLINK for vlan dels 661 */ 662 br_ifinfo_notify(RTM_NEWLINK, p); 663 664 return err; 665 } 666 static int br_validate(struct nlattr *tb[], struct nlattr *data[]) 667 { 668 if (tb[IFLA_ADDRESS]) { 669 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 670 return -EINVAL; 671 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 672 return -EADDRNOTAVAIL; 673 } 674 675 if (!data) 676 return 0; 677 678 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 679 if (data[IFLA_BR_VLAN_PROTOCOL]) { 680 switch (nla_get_be16(data[IFLA_BR_VLAN_PROTOCOL])) { 681 case htons(ETH_P_8021Q): 682 case htons(ETH_P_8021AD): 683 break; 684 default: 685 return -EPROTONOSUPPORT; 686 } 687 } 688 #endif 689 690 return 0; 691 } 692 693 static int br_dev_newlink(struct net *src_net, struct net_device *dev, 694 struct nlattr *tb[], struct nlattr *data[]) 695 { 696 struct net_bridge *br = netdev_priv(dev); 697 698 if (tb[IFLA_ADDRESS]) { 699 spin_lock_bh(&br->lock); 700 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS])); 701 spin_unlock_bh(&br->lock); 702 } 703 704 return register_netdevice(dev); 705 } 706 707 static int br_port_slave_changelink(struct net_device *brdev, 708 struct net_device *dev, 709 struct nlattr *tb[], 710 struct nlattr *data[]) 711 { 712 struct net_bridge *br = netdev_priv(brdev); 713 int ret; 714 715 if (!data) 716 return 0; 717 718 spin_lock_bh(&br->lock); 719 ret = br_setport(br_port_get_rtnl(dev), data); 720 spin_unlock_bh(&br->lock); 721 722 return ret; 723 } 724 725 static int br_port_fill_slave_info(struct sk_buff *skb, 726 const struct net_device *brdev, 727 const struct net_device *dev) 728 { 729 return br_port_fill_attrs(skb, br_port_get_rtnl(dev)); 730 } 731 732 static size_t br_port_get_slave_size(const struct net_device *brdev, 733 const struct net_device *dev) 734 { 735 return br_port_info_size(); 736 } 737 738 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = { 739 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 }, 740 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 }, 741 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 }, 742 [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 }, 743 [IFLA_BR_STP_STATE] = { .type = NLA_U32 }, 744 [IFLA_BR_PRIORITY] = { .type = NLA_U16 }, 745 [IFLA_BR_VLAN_FILTERING] = { .type = NLA_U8 }, 746 [IFLA_BR_VLAN_PROTOCOL] = { .type = NLA_U16 }, 747 }; 748 749 static int br_changelink(struct net_device *brdev, struct nlattr *tb[], 750 struct nlattr *data[]) 751 { 752 struct net_bridge *br = netdev_priv(brdev); 753 int err; 754 755 if (!data) 756 return 0; 757 758 if (data[IFLA_BR_FORWARD_DELAY]) { 759 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY])); 760 if (err) 761 return err; 762 } 763 764 if (data[IFLA_BR_HELLO_TIME]) { 765 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME])); 766 if (err) 767 return err; 768 } 769 770 if (data[IFLA_BR_MAX_AGE]) { 771 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE])); 772 if (err) 773 return err; 774 } 775 776 if (data[IFLA_BR_AGEING_TIME]) { 777 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]); 778 779 br->ageing_time = clock_t_to_jiffies(ageing_time); 780 } 781 782 if (data[IFLA_BR_STP_STATE]) { 783 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]); 784 785 br_stp_set_enabled(br, stp_enabled); 786 } 787 788 if (data[IFLA_BR_PRIORITY]) { 789 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]); 790 791 br_stp_set_bridge_priority(br, priority); 792 } 793 794 if (data[IFLA_BR_VLAN_FILTERING]) { 795 u8 vlan_filter = nla_get_u8(data[IFLA_BR_VLAN_FILTERING]); 796 797 err = __br_vlan_filter_toggle(br, vlan_filter); 798 if (err) 799 return err; 800 } 801 802 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 803 if (data[IFLA_BR_VLAN_PROTOCOL]) { 804 __be16 vlan_proto = nla_get_be16(data[IFLA_BR_VLAN_PROTOCOL]); 805 806 err = __br_vlan_set_proto(br, vlan_proto); 807 if (err) 808 return err; 809 } 810 #endif 811 812 return 0; 813 } 814 815 static size_t br_get_size(const struct net_device *brdev) 816 { 817 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */ 818 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */ 819 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */ 820 nla_total_size(sizeof(u32)) + /* IFLA_BR_AGEING_TIME */ 821 nla_total_size(sizeof(u32)) + /* IFLA_BR_STP_STATE */ 822 nla_total_size(sizeof(u16)) + /* IFLA_BR_PRIORITY */ 823 nla_total_size(sizeof(u8)) + /* IFLA_BR_VLAN_FILTERING */ 824 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 825 nla_total_size(sizeof(__be16)) + /* IFLA_BR_VLAN_PROTOCOL */ 826 #endif 827 0; 828 } 829 830 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev) 831 { 832 struct net_bridge *br = netdev_priv(brdev); 833 u32 forward_delay = jiffies_to_clock_t(br->forward_delay); 834 u32 hello_time = jiffies_to_clock_t(br->hello_time); 835 u32 age_time = jiffies_to_clock_t(br->max_age); 836 u32 ageing_time = jiffies_to_clock_t(br->ageing_time); 837 u32 stp_enabled = br->stp_enabled; 838 u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]; 839 u8 vlan_enabled = br_vlan_enabled(br); 840 841 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) || 842 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) || 843 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) || 844 nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) || 845 nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) || 846 nla_put_u16(skb, IFLA_BR_PRIORITY, priority) || 847 nla_put_u8(skb, IFLA_BR_VLAN_FILTERING, vlan_enabled)) 848 return -EMSGSIZE; 849 850 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 851 if (nla_put_be16(skb, IFLA_BR_VLAN_PROTOCOL, br->vlan_proto)) 852 return -EMSGSIZE; 853 #endif 854 855 return 0; 856 } 857 858 static size_t br_get_link_af_size(const struct net_device *dev) 859 { 860 struct net_port_vlans *pv; 861 862 if (br_port_exists(dev)) 863 pv = nbp_get_vlan_info(br_port_get_rtnl(dev)); 864 else if (dev->priv_flags & IFF_EBRIDGE) 865 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev)); 866 else 867 return 0; 868 869 if (!pv) 870 return 0; 871 872 /* Each VLAN is returned in bridge_vlan_info along with flags */ 873 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info)); 874 } 875 876 static struct rtnl_af_ops br_af_ops __read_mostly = { 877 .family = AF_BRIDGE, 878 .get_link_af_size = br_get_link_af_size, 879 }; 880 881 struct rtnl_link_ops br_link_ops __read_mostly = { 882 .kind = "bridge", 883 .priv_size = sizeof(struct net_bridge), 884 .setup = br_dev_setup, 885 .maxtype = IFLA_BR_MAX, 886 .policy = br_policy, 887 .validate = br_validate, 888 .newlink = br_dev_newlink, 889 .changelink = br_changelink, 890 .dellink = br_dev_delete, 891 .get_size = br_get_size, 892 .fill_info = br_fill_info, 893 894 .slave_maxtype = IFLA_BRPORT_MAX, 895 .slave_policy = br_port_policy, 896 .slave_changelink = br_port_slave_changelink, 897 .get_slave_size = br_port_get_slave_size, 898 .fill_slave_info = br_port_fill_slave_info, 899 }; 900 901 int __init br_netlink_init(void) 902 { 903 int err; 904 905 br_mdb_init(); 906 rtnl_af_register(&br_af_ops); 907 908 err = rtnl_link_register(&br_link_ops); 909 if (err) 910 goto out_af; 911 912 return 0; 913 914 out_af: 915 rtnl_af_unregister(&br_af_ops); 916 br_mdb_uninit(); 917 return err; 918 } 919 920 void br_netlink_fini(void) 921 { 922 br_mdb_uninit(); 923 rtnl_af_unregister(&br_af_ops); 924 rtnl_link_unregister(&br_link_ops); 925 } 926