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 if (err < 0) 199 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 200 } 201 202 203 /* 204 * Dump information about all ports, in response to GETLINK 205 */ 206 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, 207 struct net_device *dev, u32 filter_mask) 208 { 209 int err = 0; 210 struct net_bridge_port *port = br_port_get_rtnl(dev); 211 212 /* not a bridge port and */ 213 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN)) 214 goto out; 215 216 err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI, 217 filter_mask, dev); 218 out: 219 return err; 220 } 221 222 static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = { 223 [IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 }, 224 [IFLA_BRIDGE_MODE] = { .type = NLA_U16 }, 225 [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY, 226 .len = sizeof(struct bridge_vlan_info), }, 227 }; 228 229 static int br_afspec(struct net_bridge *br, 230 struct net_bridge_port *p, 231 struct nlattr *af_spec, 232 int cmd) 233 { 234 struct nlattr *tb[IFLA_BRIDGE_MAX+1]; 235 int err = 0; 236 237 err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy); 238 if (err) 239 return err; 240 241 if (tb[IFLA_BRIDGE_VLAN_INFO]) { 242 struct bridge_vlan_info *vinfo; 243 244 vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]); 245 246 if (vinfo->vid >= VLAN_N_VID) 247 return -EINVAL; 248 249 switch (cmd) { 250 case RTM_SETLINK: 251 if (p) { 252 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags); 253 if (err) 254 break; 255 256 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) 257 err = br_vlan_add(p->br, vinfo->vid, 258 vinfo->flags); 259 } else 260 err = br_vlan_add(br, vinfo->vid, vinfo->flags); 261 262 if (err) 263 break; 264 265 break; 266 267 case RTM_DELLINK: 268 if (p) { 269 nbp_vlan_delete(p, vinfo->vid); 270 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) 271 br_vlan_delete(p->br, vinfo->vid); 272 } else 273 br_vlan_delete(br, vinfo->vid); 274 break; 275 } 276 } 277 278 return err; 279 } 280 281 static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = { 282 [IFLA_BRPORT_STATE] = { .type = NLA_U8 }, 283 [IFLA_BRPORT_COST] = { .type = NLA_U32 }, 284 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 }, 285 [IFLA_BRPORT_MODE] = { .type = NLA_U8 }, 286 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 }, 287 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 }, 288 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 }, 289 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 }, 290 }; 291 292 /* Change the state of the port and notify spanning tree */ 293 static int br_set_port_state(struct net_bridge_port *p, u8 state) 294 { 295 if (state > BR_STATE_BLOCKING) 296 return -EINVAL; 297 298 /* if kernel STP is running, don't allow changes */ 299 if (p->br->stp_enabled == BR_KERNEL_STP) 300 return -EBUSY; 301 302 /* if device is not up, change is not allowed 303 * if link is not present, only allowable state is disabled 304 */ 305 if (!netif_running(p->dev) || 306 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED)) 307 return -ENETDOWN; 308 309 p->state = state; 310 br_log_state(p); 311 br_port_state_selection(p->br); 312 return 0; 313 } 314 315 /* Set/clear or port flags based on attribute */ 316 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[], 317 int attrtype, unsigned long mask) 318 { 319 if (tb[attrtype]) { 320 u8 flag = nla_get_u8(tb[attrtype]); 321 if (flag) 322 p->flags |= mask; 323 else 324 p->flags &= ~mask; 325 } 326 } 327 328 /* Process bridge protocol info on port */ 329 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[]) 330 { 331 int err; 332 333 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE); 334 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD); 335 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE); 336 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK); 337 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING); 338 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD); 339 340 if (tb[IFLA_BRPORT_COST]) { 341 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST])); 342 if (err) 343 return err; 344 } 345 346 if (tb[IFLA_BRPORT_PRIORITY]) { 347 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY])); 348 if (err) 349 return err; 350 } 351 352 if (tb[IFLA_BRPORT_STATE]) { 353 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE])); 354 if (err) 355 return err; 356 } 357 return 0; 358 } 359 360 /* Change state and parameters on port. */ 361 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh) 362 { 363 struct nlattr *protinfo; 364 struct nlattr *afspec; 365 struct net_bridge_port *p; 366 struct nlattr *tb[IFLA_BRPORT_MAX + 1]; 367 int err = 0; 368 369 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO); 370 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 371 if (!protinfo && !afspec) 372 return 0; 373 374 p = br_port_get_rtnl(dev); 375 /* We want to accept dev as bridge itself if the AF_SPEC 376 * is set to see if someone is setting vlan info on the brigde 377 */ 378 if (!p && !afspec) 379 return -EINVAL; 380 381 if (p && protinfo) { 382 if (protinfo->nla_type & NLA_F_NESTED) { 383 err = nla_parse_nested(tb, IFLA_BRPORT_MAX, 384 protinfo, ifla_brport_policy); 385 if (err) 386 return err; 387 388 spin_lock_bh(&p->br->lock); 389 err = br_setport(p, tb); 390 spin_unlock_bh(&p->br->lock); 391 } else { 392 /* Binary compatability with old RSTP */ 393 if (nla_len(protinfo) < sizeof(u8)) 394 return -EINVAL; 395 396 spin_lock_bh(&p->br->lock); 397 err = br_set_port_state(p, nla_get_u8(protinfo)); 398 spin_unlock_bh(&p->br->lock); 399 } 400 if (err) 401 goto out; 402 } 403 404 if (afspec) { 405 err = br_afspec((struct net_bridge *)netdev_priv(dev), p, 406 afspec, RTM_SETLINK); 407 } 408 409 if (err == 0) 410 br_ifinfo_notify(RTM_NEWLINK, p); 411 412 out: 413 return err; 414 } 415 416 /* Delete port information */ 417 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh) 418 { 419 struct nlattr *afspec; 420 struct net_bridge_port *p; 421 int err; 422 423 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 424 if (!afspec) 425 return 0; 426 427 p = br_port_get_rtnl(dev); 428 /* We want to accept dev as bridge itself as well */ 429 if (!p && !(dev->priv_flags & IFF_EBRIDGE)) 430 return -EINVAL; 431 432 err = br_afspec((struct net_bridge *)netdev_priv(dev), p, 433 afspec, RTM_DELLINK); 434 435 return err; 436 } 437 static int br_validate(struct nlattr *tb[], struct nlattr *data[]) 438 { 439 if (tb[IFLA_ADDRESS]) { 440 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 441 return -EINVAL; 442 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 443 return -EADDRNOTAVAIL; 444 } 445 446 return 0; 447 } 448 449 static size_t br_get_link_af_size(const struct net_device *dev) 450 { 451 struct net_port_vlans *pv; 452 453 if (br_port_exists(dev)) 454 pv = nbp_get_vlan_info(br_port_get_rtnl(dev)); 455 else if (dev->priv_flags & IFF_EBRIDGE) 456 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev)); 457 else 458 return 0; 459 460 if (!pv) 461 return 0; 462 463 /* Each VLAN is returned in bridge_vlan_info along with flags */ 464 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info)); 465 } 466 467 static struct rtnl_af_ops br_af_ops = { 468 .family = AF_BRIDGE, 469 .get_link_af_size = br_get_link_af_size, 470 }; 471 472 struct rtnl_link_ops br_link_ops __read_mostly = { 473 .kind = "bridge", 474 .priv_size = sizeof(struct net_bridge), 475 .setup = br_dev_setup, 476 .validate = br_validate, 477 .dellink = br_dev_delete, 478 }; 479 480 int __init br_netlink_init(void) 481 { 482 int err; 483 484 br_mdb_init(); 485 err = rtnl_af_register(&br_af_ops); 486 if (err) 487 goto out; 488 489 err = rtnl_link_register(&br_link_ops); 490 if (err) 491 goto out_af; 492 493 return 0; 494 495 out_af: 496 rtnl_af_unregister(&br_af_ops); 497 out: 498 br_mdb_uninit(); 499 return err; 500 } 501 502 void __exit br_netlink_fini(void) 503 { 504 br_mdb_uninit(); 505 rtnl_af_unregister(&br_af_ops); 506 rtnl_link_unregister(&br_link_ops); 507 } 508