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 inline size_t br_port_info_size(void) 25 { 26 return nla_total_size(1) /* IFLA_BRPORT_STATE */ 27 + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */ 28 + nla_total_size(4) /* IFLA_BRPORT_COST */ 29 + nla_total_size(1) /* IFLA_BRPORT_MODE */ 30 + nla_total_size(1) /* IFLA_BRPORT_GUARD */ 31 + nla_total_size(1) /* IFLA_BRPORT_PROTECT */ 32 + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */ 33 + nla_total_size(1) /* IFLA_BRPORT_LEARNING */ 34 + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */ 35 + 0; 36 } 37 38 static inline size_t br_nlmsg_size(void) 39 { 40 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 41 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 42 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 43 + nla_total_size(4) /* IFLA_MASTER */ 44 + nla_total_size(4) /* IFLA_MTU */ 45 + nla_total_size(4) /* IFLA_LINK */ 46 + nla_total_size(1) /* IFLA_OPERSTATE */ 47 + nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */ 48 } 49 50 static int br_port_fill_attrs(struct sk_buff *skb, 51 const struct net_bridge_port *p) 52 { 53 u8 mode = !!(p->flags & BR_HAIRPIN_MODE); 54 55 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) || 56 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) || 57 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) || 58 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) || 59 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) || 60 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) || 61 nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) || 62 nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) || 63 nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD))) 64 return -EMSGSIZE; 65 66 return 0; 67 } 68 69 /* 70 * Create one netlink message for one interface 71 * Contains port and master info as well as carrier and bridge state. 72 */ 73 static int br_fill_ifinfo(struct sk_buff *skb, 74 const struct net_bridge_port *port, 75 u32 pid, u32 seq, int event, unsigned int flags, 76 u32 filter_mask, const struct net_device *dev) 77 { 78 const struct net_bridge *br; 79 struct ifinfomsg *hdr; 80 struct nlmsghdr *nlh; 81 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 82 83 if (port) 84 br = port->br; 85 else 86 br = netdev_priv(dev); 87 88 br_debug(br, "br_fill_info event %d port %s master %s\n", 89 event, dev->name, br->dev->name); 90 91 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 92 if (nlh == NULL) 93 return -EMSGSIZE; 94 95 hdr = nlmsg_data(nlh); 96 hdr->ifi_family = AF_BRIDGE; 97 hdr->__ifi_pad = 0; 98 hdr->ifi_type = dev->type; 99 hdr->ifi_index = dev->ifindex; 100 hdr->ifi_flags = dev_get_flags(dev); 101 hdr->ifi_change = 0; 102 103 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 104 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) || 105 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 106 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 107 (dev->addr_len && 108 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 109 (dev->ifindex != dev->iflink && 110 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 111 goto nla_put_failure; 112 113 if (event == RTM_NEWLINK && port) { 114 struct nlattr *nest 115 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 116 117 if (nest == NULL || br_port_fill_attrs(skb, port) < 0) 118 goto nla_put_failure; 119 nla_nest_end(skb, nest); 120 } 121 122 /* Check if the VID information is requested */ 123 if (filter_mask & RTEXT_FILTER_BRVLAN) { 124 struct nlattr *af; 125 const struct net_port_vlans *pv; 126 struct bridge_vlan_info vinfo; 127 u16 vid; 128 u16 pvid; 129 130 if (port) 131 pv = nbp_get_vlan_info(port); 132 else 133 pv = br_get_vlan_info(br); 134 135 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) 136 goto done; 137 138 af = nla_nest_start(skb, IFLA_AF_SPEC); 139 if (!af) 140 goto nla_put_failure; 141 142 pvid = br_get_pvid(pv); 143 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { 144 vinfo.vid = vid; 145 vinfo.flags = 0; 146 if (vid == pvid) 147 vinfo.flags |= BRIDGE_VLAN_INFO_PVID; 148 149 if (test_bit(vid, pv->untagged_bitmap)) 150 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED; 151 152 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, 153 sizeof(vinfo), &vinfo)) 154 goto nla_put_failure; 155 } 156 157 nla_nest_end(skb, af); 158 } 159 160 done: 161 return nlmsg_end(skb, nlh); 162 163 nla_put_failure: 164 nlmsg_cancel(skb, nlh); 165 return -EMSGSIZE; 166 } 167 168 /* 169 * Notify listeners of a change in port information 170 */ 171 void br_ifinfo_notify(int event, struct net_bridge_port *port) 172 { 173 struct net *net; 174 struct sk_buff *skb; 175 int err = -ENOBUFS; 176 177 if (!port) 178 return; 179 180 net = dev_net(port->dev); 181 br_debug(port->br, "port %u(%s) event %d\n", 182 (unsigned int)port->port_no, port->dev->name, event); 183 184 skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); 185 if (skb == NULL) 186 goto errout; 187 188 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev); 189 if (err < 0) { 190 /* -EMSGSIZE implies BUG in br_nlmsg_size() */ 191 WARN_ON(err == -EMSGSIZE); 192 kfree_skb(skb); 193 goto errout; 194 } 195 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 196 return; 197 errout: 198 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 199 } 200 201 202 /* 203 * Dump information about all ports, in response to GETLINK 204 */ 205 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, 206 struct net_device *dev, u32 filter_mask) 207 { 208 int err = 0; 209 struct net_bridge_port *port = br_port_get_rtnl(dev); 210 211 /* not a bridge port and */ 212 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN)) 213 goto out; 214 215 err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI, 216 filter_mask, dev); 217 out: 218 return err; 219 } 220 221 static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = { 222 [IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 }, 223 [IFLA_BRIDGE_MODE] = { .type = NLA_U16 }, 224 [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY, 225 .len = sizeof(struct bridge_vlan_info), }, 226 }; 227 228 static int br_afspec(struct net_bridge *br, 229 struct net_bridge_port *p, 230 struct nlattr *af_spec, 231 int cmd) 232 { 233 struct nlattr *tb[IFLA_BRIDGE_MAX+1]; 234 int err = 0; 235 236 err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy); 237 if (err) 238 return err; 239 240 if (tb[IFLA_BRIDGE_VLAN_INFO]) { 241 struct bridge_vlan_info *vinfo; 242 243 vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]); 244 245 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK) 246 return -EINVAL; 247 248 switch (cmd) { 249 case RTM_SETLINK: 250 if (p) { 251 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags); 252 if (err) 253 break; 254 255 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) 256 err = br_vlan_add(p->br, vinfo->vid, 257 vinfo->flags); 258 } else 259 err = br_vlan_add(br, vinfo->vid, vinfo->flags); 260 261 if (err) 262 break; 263 264 break; 265 266 case RTM_DELLINK: 267 if (p) { 268 nbp_vlan_delete(p, vinfo->vid); 269 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) 270 br_vlan_delete(p->br, vinfo->vid); 271 } else 272 br_vlan_delete(br, vinfo->vid); 273 break; 274 } 275 } 276 277 return err; 278 } 279 280 static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = { 281 [IFLA_BRPORT_STATE] = { .type = NLA_U8 }, 282 [IFLA_BRPORT_COST] = { .type = NLA_U32 }, 283 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 }, 284 [IFLA_BRPORT_MODE] = { .type = NLA_U8 }, 285 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 }, 286 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 }, 287 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 }, 288 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 }, 289 }; 290 291 /* Change the state of the port and notify spanning tree */ 292 static int br_set_port_state(struct net_bridge_port *p, u8 state) 293 { 294 if (state > BR_STATE_BLOCKING) 295 return -EINVAL; 296 297 /* if kernel STP is running, don't allow changes */ 298 if (p->br->stp_enabled == BR_KERNEL_STP) 299 return -EBUSY; 300 301 /* if device is not up, change is not allowed 302 * if link is not present, only allowable state is disabled 303 */ 304 if (!netif_running(p->dev) || 305 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED)) 306 return -ENETDOWN; 307 308 p->state = state; 309 br_log_state(p); 310 br_port_state_selection(p->br); 311 return 0; 312 } 313 314 /* Set/clear or port flags based on attribute */ 315 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[], 316 int attrtype, unsigned long mask) 317 { 318 if (tb[attrtype]) { 319 u8 flag = nla_get_u8(tb[attrtype]); 320 if (flag) 321 p->flags |= mask; 322 else 323 p->flags &= ~mask; 324 } 325 } 326 327 /* Process bridge protocol info on port */ 328 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[]) 329 { 330 int err; 331 332 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE); 333 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD); 334 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE); 335 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK); 336 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING); 337 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD); 338 339 if (tb[IFLA_BRPORT_COST]) { 340 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST])); 341 if (err) 342 return err; 343 } 344 345 if (tb[IFLA_BRPORT_PRIORITY]) { 346 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY])); 347 if (err) 348 return err; 349 } 350 351 if (tb[IFLA_BRPORT_STATE]) { 352 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE])); 353 if (err) 354 return err; 355 } 356 return 0; 357 } 358 359 /* Change state and parameters on port. */ 360 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh) 361 { 362 struct nlattr *protinfo; 363 struct nlattr *afspec; 364 struct net_bridge_port *p; 365 struct nlattr *tb[IFLA_BRPORT_MAX + 1]; 366 int err = 0; 367 368 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO); 369 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 370 if (!protinfo && !afspec) 371 return 0; 372 373 p = br_port_get_rtnl(dev); 374 /* We want to accept dev as bridge itself if the AF_SPEC 375 * is set to see if someone is setting vlan info on the bridge 376 */ 377 if (!p && !afspec) 378 return -EINVAL; 379 380 if (p && protinfo) { 381 if (protinfo->nla_type & NLA_F_NESTED) { 382 err = nla_parse_nested(tb, IFLA_BRPORT_MAX, 383 protinfo, ifla_brport_policy); 384 if (err) 385 return err; 386 387 spin_lock_bh(&p->br->lock); 388 err = br_setport(p, tb); 389 spin_unlock_bh(&p->br->lock); 390 } else { 391 /* Binary compatibility with old RSTP */ 392 if (nla_len(protinfo) < sizeof(u8)) 393 return -EINVAL; 394 395 spin_lock_bh(&p->br->lock); 396 err = br_set_port_state(p, nla_get_u8(protinfo)); 397 spin_unlock_bh(&p->br->lock); 398 } 399 if (err) 400 goto out; 401 } 402 403 if (afspec) { 404 err = br_afspec((struct net_bridge *)netdev_priv(dev), p, 405 afspec, RTM_SETLINK); 406 } 407 408 if (err == 0) 409 br_ifinfo_notify(RTM_NEWLINK, p); 410 411 out: 412 return err; 413 } 414 415 /* Delete port information */ 416 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh) 417 { 418 struct nlattr *afspec; 419 struct net_bridge_port *p; 420 int err; 421 422 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 423 if (!afspec) 424 return 0; 425 426 p = br_port_get_rtnl(dev); 427 /* We want to accept dev as bridge itself as well */ 428 if (!p && !(dev->priv_flags & IFF_EBRIDGE)) 429 return -EINVAL; 430 431 err = br_afspec((struct net_bridge *)netdev_priv(dev), p, 432 afspec, RTM_DELLINK); 433 434 return err; 435 } 436 static int br_validate(struct nlattr *tb[], struct nlattr *data[]) 437 { 438 if (tb[IFLA_ADDRESS]) { 439 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 440 return -EINVAL; 441 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 442 return -EADDRNOTAVAIL; 443 } 444 445 return 0; 446 } 447 448 static int br_dev_newlink(struct net *src_net, struct net_device *dev, 449 struct nlattr *tb[], struct nlattr *data[]) 450 { 451 struct net_bridge *br = netdev_priv(dev); 452 453 if (tb[IFLA_ADDRESS]) { 454 spin_lock_bh(&br->lock); 455 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS])); 456 spin_unlock_bh(&br->lock); 457 } 458 459 return register_netdevice(dev); 460 } 461 462 static size_t br_get_link_af_size(const struct net_device *dev) 463 { 464 struct net_port_vlans *pv; 465 466 if (br_port_exists(dev)) 467 pv = nbp_get_vlan_info(br_port_get_rtnl(dev)); 468 else if (dev->priv_flags & IFF_EBRIDGE) 469 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev)); 470 else 471 return 0; 472 473 if (!pv) 474 return 0; 475 476 /* Each VLAN is returned in bridge_vlan_info along with flags */ 477 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info)); 478 } 479 480 static struct rtnl_af_ops br_af_ops = { 481 .family = AF_BRIDGE, 482 .get_link_af_size = br_get_link_af_size, 483 }; 484 485 struct rtnl_link_ops br_link_ops __read_mostly = { 486 .kind = "bridge", 487 .priv_size = sizeof(struct net_bridge), 488 .setup = br_dev_setup, 489 .validate = br_validate, 490 .newlink = br_dev_newlink, 491 .dellink = br_dev_delete, 492 }; 493 494 int __init br_netlink_init(void) 495 { 496 int err; 497 498 br_mdb_init(); 499 rtnl_af_register(&br_af_ops); 500 501 err = rtnl_link_register(&br_link_ops); 502 if (err) 503 goto out_af; 504 505 return 0; 506 507 out_af: 508 rtnl_af_unregister(&br_af_ops); 509 br_mdb_uninit(); 510 return err; 511 } 512 513 void __exit br_netlink_fini(void) 514 { 515 br_mdb_uninit(); 516 rtnl_af_unregister(&br_af_ops); 517 rtnl_link_unregister(&br_link_ops); 518 } 519