1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright 2011-2014 Autronica Fire and Security AS 3 * 4 * Author(s): 5 * 2011-2014 Arvid Brodin, arvid.brodin@alten.se 6 * 7 * Routines for handling Netlink messages for HSR and PRP. 8 */ 9 10 #include "hsr_netlink.h" 11 #include <linux/kernel.h> 12 #include <net/rtnetlink.h> 13 #include <net/genetlink.h> 14 #include "hsr_main.h" 15 #include "hsr_device.h" 16 #include "hsr_framereg.h" 17 18 static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = { 19 [IFLA_HSR_SLAVE1] = { .type = NLA_U32 }, 20 [IFLA_HSR_SLAVE2] = { .type = NLA_U32 }, 21 [IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 }, 22 [IFLA_HSR_VERSION] = { .type = NLA_U8 }, 23 [IFLA_HSR_SUPERVISION_ADDR] = { .len = ETH_ALEN }, 24 [IFLA_HSR_SEQ_NR] = { .type = NLA_U16 }, 25 [IFLA_HSR_PROTOCOL] = { .type = NLA_U8 }, 26 [IFLA_HSR_INTERLINK] = { .type = NLA_U32 }, 27 }; 28 29 /* Here, it seems a netdevice has already been allocated for us, and the 30 * hsr_dev_setup routine has been executed. Nice! 31 */ 32 static int hsr_newlink(struct net_device *dev, 33 struct rtnl_newlink_params *params, 34 struct netlink_ext_ack *extack) 35 { 36 struct net *link_net = rtnl_newlink_link_net(params); 37 struct net_device *link[2], *interlink = NULL; 38 struct nlattr **data = params->data; 39 enum hsr_version proto_version; 40 unsigned char multicast_spec; 41 u8 proto = HSR_PROTOCOL_HSR; 42 43 if (!net_eq(link_net, dev_net(dev))) { 44 NL_SET_ERR_MSG_MOD(extack, 45 "HSR slaves/interlink must be on the same net namespace than HSR link"); 46 return -EINVAL; 47 } 48 49 if (!data) { 50 NL_SET_ERR_MSG_MOD(extack, "No slave devices specified"); 51 return -EINVAL; 52 } 53 if (!data[IFLA_HSR_SLAVE1]) { 54 NL_SET_ERR_MSG_MOD(extack, "Slave1 device not specified"); 55 return -EINVAL; 56 } 57 link[0] = __dev_get_by_index(link_net, 58 nla_get_u32(data[IFLA_HSR_SLAVE1])); 59 if (!link[0]) { 60 NL_SET_ERR_MSG_MOD(extack, "Slave1 does not exist"); 61 return -EINVAL; 62 } 63 if (!data[IFLA_HSR_SLAVE2]) { 64 NL_SET_ERR_MSG_MOD(extack, "Slave2 device not specified"); 65 return -EINVAL; 66 } 67 link[1] = __dev_get_by_index(link_net, 68 nla_get_u32(data[IFLA_HSR_SLAVE2])); 69 if (!link[1]) { 70 NL_SET_ERR_MSG_MOD(extack, "Slave2 does not exist"); 71 return -EINVAL; 72 } 73 74 if (link[0] == link[1]) { 75 NL_SET_ERR_MSG_MOD(extack, "Slave1 and Slave2 are same"); 76 return -EINVAL; 77 } 78 79 if (data[IFLA_HSR_INTERLINK]) { 80 interlink = __dev_get_by_index(link_net, 81 nla_get_u32(data[IFLA_HSR_INTERLINK])); 82 if (!interlink) { 83 NL_SET_ERR_MSG_MOD(extack, "Interlink does not exist"); 84 return -EINVAL; 85 } 86 } 87 88 if (interlink && interlink == link[0]) { 89 NL_SET_ERR_MSG_MOD(extack, "Interlink and Slave1 are the same"); 90 return -EINVAL; 91 } 92 93 if (interlink && interlink == link[1]) { 94 NL_SET_ERR_MSG_MOD(extack, "Interlink and Slave2 are the same"); 95 return -EINVAL; 96 } 97 98 multicast_spec = nla_get_u8_default(data[IFLA_HSR_MULTICAST_SPEC], 0); 99 100 if (data[IFLA_HSR_PROTOCOL]) 101 proto = nla_get_u8(data[IFLA_HSR_PROTOCOL]); 102 103 if (proto >= HSR_PROTOCOL_MAX) { 104 NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol"); 105 return -EINVAL; 106 } 107 108 if (!data[IFLA_HSR_VERSION]) { 109 proto_version = HSR_V0; 110 } else { 111 if (proto == HSR_PROTOCOL_PRP) { 112 NL_SET_ERR_MSG_MOD(extack, "PRP version unsupported"); 113 return -EINVAL; 114 } 115 116 proto_version = nla_get_u8(data[IFLA_HSR_VERSION]); 117 if (proto_version > HSR_V1) { 118 NL_SET_ERR_MSG_MOD(extack, 119 "Only HSR version 0/1 supported"); 120 return -EINVAL; 121 } 122 } 123 124 if (proto == HSR_PROTOCOL_PRP) 125 proto_version = PRP_V1; 126 127 return hsr_dev_finalize(dev, link, interlink, multicast_spec, 128 proto_version, extack); 129 } 130 131 static void hsr_dellink(struct net_device *dev, struct list_head *head) 132 { 133 struct hsr_priv *hsr = netdev_priv(dev); 134 135 timer_delete_sync(&hsr->prune_timer); 136 timer_delete_sync(&hsr->prune_proxy_timer); 137 timer_delete_sync(&hsr->announce_timer); 138 timer_delete_sync(&hsr->announce_proxy_timer); 139 140 hsr_debugfs_term(hsr); 141 hsr_del_ports(hsr); 142 143 hsr_del_self_node(hsr); 144 hsr_del_nodes(&hsr->node_db); 145 hsr_del_nodes(&hsr->proxy_node_db); 146 147 unregister_netdevice_queue(dev, head); 148 } 149 150 static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev) 151 { 152 struct hsr_priv *hsr = netdev_priv(dev); 153 u8 proto = HSR_PROTOCOL_HSR; 154 struct hsr_port *port; 155 156 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); 157 if (port) { 158 if (nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex)) 159 goto nla_put_failure; 160 } 161 162 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); 163 if (port) { 164 if (nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex)) 165 goto nla_put_failure; 166 } 167 168 port = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK); 169 if (port) { 170 if (nla_put_u32(skb, IFLA_HSR_INTERLINK, port->dev->ifindex)) 171 goto nla_put_failure; 172 } 173 174 if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN, 175 hsr->sup_multicast_addr) || 176 nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr)) 177 goto nla_put_failure; 178 if (hsr->prot_version == PRP_V1) 179 proto = HSR_PROTOCOL_PRP; 180 else if (nla_put_u8(skb, IFLA_HSR_VERSION, hsr->prot_version)) 181 goto nla_put_failure; 182 if (nla_put_u8(skb, IFLA_HSR_PROTOCOL, proto)) 183 goto nla_put_failure; 184 185 return 0; 186 187 nla_put_failure: 188 return -EMSGSIZE; 189 } 190 191 static struct rtnl_link_ops hsr_link_ops __read_mostly = { 192 .kind = "hsr", 193 .maxtype = IFLA_HSR_MAX, 194 .policy = hsr_policy, 195 .priv_size = sizeof(struct hsr_priv), 196 .setup = hsr_dev_setup, 197 .newlink = hsr_newlink, 198 .dellink = hsr_dellink, 199 .fill_info = hsr_fill_info, 200 }; 201 202 /* attribute policy */ 203 static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = { 204 [HSR_A_NODE_ADDR] = { .len = ETH_ALEN }, 205 [HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN }, 206 [HSR_A_IFINDEX] = { .type = NLA_U32 }, 207 [HSR_A_IF1_AGE] = { .type = NLA_U32 }, 208 [HSR_A_IF2_AGE] = { .type = NLA_U32 }, 209 [HSR_A_IF1_SEQ] = { .type = NLA_U16 }, 210 [HSR_A_IF2_SEQ] = { .type = NLA_U16 }, 211 }; 212 213 static struct genl_family hsr_genl_family; 214 215 static const struct genl_multicast_group hsr_mcgrps[] = { 216 { .name = "hsr-network", }, 217 }; 218 219 /* This is called if for some node with MAC address addr, we only get frames 220 * over one of the slave interfaces. This would indicate an open network ring 221 * (i.e. a link has failed somewhere). 222 */ 223 void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN], 224 struct hsr_port *port) 225 { 226 struct sk_buff *skb; 227 void *msg_head; 228 struct hsr_port *master; 229 int res; 230 231 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 232 if (!skb) 233 goto fail; 234 235 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, 236 HSR_C_RING_ERROR); 237 if (!msg_head) 238 goto nla_put_failure; 239 240 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); 241 if (res < 0) 242 goto nla_put_failure; 243 244 res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex); 245 if (res < 0) 246 goto nla_put_failure; 247 248 genlmsg_end(skb, msg_head); 249 genlmsg_multicast_netns(&hsr_genl_family, dev_net(port->dev), 250 skb, 0, 0, GFP_ATOMIC); 251 252 return; 253 254 nla_put_failure: 255 kfree_skb(skb); 256 257 fail: 258 rcu_read_lock(); 259 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 260 netdev_warn(master->dev, "Could not send HSR ring error message\n"); 261 rcu_read_unlock(); 262 } 263 264 /* This is called when we haven't heard from the node with MAC address addr for 265 * some time (just before the node is removed from the node table/list). 266 */ 267 void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN]) 268 { 269 struct sk_buff *skb; 270 void *msg_head; 271 struct hsr_port *master; 272 int res; 273 274 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 275 if (!skb) 276 goto fail; 277 278 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN); 279 if (!msg_head) 280 goto nla_put_failure; 281 282 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); 283 if (res < 0) 284 goto nla_put_failure; 285 286 rcu_read_lock(); 287 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 288 genlmsg_end(skb, msg_head); 289 genlmsg_multicast_netns(&hsr_genl_family, dev_net(master->dev), 290 skb, 0, 0, GFP_ATOMIC); 291 rcu_read_unlock(); 292 293 return; 294 295 nla_put_failure: 296 kfree_skb(skb); 297 298 fail: 299 rcu_read_lock(); 300 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 301 netdev_warn(master->dev, "Could not send HSR node down\n"); 302 rcu_read_unlock(); 303 } 304 305 /* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table 306 * about the status of a specific node in the network, defined by its MAC 307 * address. 308 * 309 * Input: hsr ifindex, node mac address 310 * Output: hsr ifindex, node mac address (copied from request), 311 * age of latest frame from node over slave 1, slave 2 [ms] 312 */ 313 static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info) 314 { 315 /* For receiving */ 316 struct nlattr *na; 317 struct net_device *hsr_dev; 318 319 /* For sending */ 320 struct sk_buff *skb_out; 321 void *msg_head; 322 struct hsr_priv *hsr; 323 struct hsr_port *port; 324 unsigned char hsr_node_addr_b[ETH_ALEN]; 325 int hsr_node_if1_age; 326 u16 hsr_node_if1_seq; 327 int hsr_node_if2_age; 328 u16 hsr_node_if2_seq; 329 int addr_b_ifindex; 330 int res; 331 332 if (!info) 333 goto invalid; 334 335 na = info->attrs[HSR_A_IFINDEX]; 336 if (!na) 337 goto invalid; 338 na = info->attrs[HSR_A_NODE_ADDR]; 339 if (!na) 340 goto invalid; 341 342 rcu_read_lock(); 343 hsr_dev = dev_get_by_index_rcu(genl_info_net(info), 344 nla_get_u32(info->attrs[HSR_A_IFINDEX])); 345 if (!hsr_dev) 346 goto rcu_unlock; 347 if (!is_hsr_master(hsr_dev)) 348 goto rcu_unlock; 349 350 /* Send reply */ 351 skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 352 if (!skb_out) { 353 res = -ENOMEM; 354 goto fail; 355 } 356 357 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid, 358 info->snd_seq, &hsr_genl_family, 0, 359 HSR_C_SET_NODE_STATUS); 360 if (!msg_head) { 361 res = -ENOMEM; 362 goto nla_put_failure; 363 } 364 365 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); 366 if (res < 0) 367 goto nla_put_failure; 368 369 hsr = netdev_priv(hsr_dev); 370 res = hsr_get_node_data(hsr, 371 (unsigned char *) 372 nla_data(info->attrs[HSR_A_NODE_ADDR]), 373 hsr_node_addr_b, 374 &addr_b_ifindex, 375 &hsr_node_if1_age, 376 &hsr_node_if1_seq, 377 &hsr_node_if2_age, 378 &hsr_node_if2_seq); 379 if (res < 0) 380 goto nla_put_failure; 381 382 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, 383 nla_data(info->attrs[HSR_A_NODE_ADDR])); 384 if (res < 0) 385 goto nla_put_failure; 386 387 if (addr_b_ifindex > -1) { 388 res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN, 389 hsr_node_addr_b); 390 if (res < 0) 391 goto nla_put_failure; 392 393 res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, 394 addr_b_ifindex); 395 if (res < 0) 396 goto nla_put_failure; 397 } 398 399 res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age); 400 if (res < 0) 401 goto nla_put_failure; 402 res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq); 403 if (res < 0) 404 goto nla_put_failure; 405 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); 406 if (port) 407 res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX, 408 port->dev->ifindex); 409 if (res < 0) 410 goto nla_put_failure; 411 412 res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age); 413 if (res < 0) 414 goto nla_put_failure; 415 res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq); 416 if (res < 0) 417 goto nla_put_failure; 418 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); 419 if (port) 420 res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX, 421 port->dev->ifindex); 422 if (res < 0) 423 goto nla_put_failure; 424 425 rcu_read_unlock(); 426 427 genlmsg_end(skb_out, msg_head); 428 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid); 429 430 return 0; 431 432 rcu_unlock: 433 rcu_read_unlock(); 434 invalid: 435 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL); 436 return 0; 437 438 nla_put_failure: 439 kfree_skb(skb_out); 440 /* Fall through */ 441 442 fail: 443 rcu_read_unlock(); 444 return res; 445 } 446 447 /* Get a list of MacAddressA of all nodes known to this node (including self). 448 */ 449 static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info) 450 { 451 unsigned char addr[ETH_ALEN]; 452 struct net_device *hsr_dev; 453 struct sk_buff *skb_out; 454 struct hsr_priv *hsr; 455 bool restart = false; 456 struct nlattr *na; 457 void *pos = NULL; 458 void *msg_head; 459 int res; 460 461 if (!info) 462 goto invalid; 463 464 na = info->attrs[HSR_A_IFINDEX]; 465 if (!na) 466 goto invalid; 467 468 rcu_read_lock(); 469 hsr_dev = dev_get_by_index_rcu(genl_info_net(info), 470 nla_get_u32(info->attrs[HSR_A_IFINDEX])); 471 if (!hsr_dev) 472 goto rcu_unlock; 473 if (!is_hsr_master(hsr_dev)) 474 goto rcu_unlock; 475 476 restart: 477 /* Send reply */ 478 skb_out = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_ATOMIC); 479 if (!skb_out) { 480 res = -ENOMEM; 481 goto fail; 482 } 483 484 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid, 485 info->snd_seq, &hsr_genl_family, 0, 486 HSR_C_SET_NODE_LIST); 487 if (!msg_head) { 488 res = -ENOMEM; 489 goto nla_put_failure; 490 } 491 492 if (!restart) { 493 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); 494 if (res < 0) 495 goto nla_put_failure; 496 } 497 498 hsr = netdev_priv(hsr_dev); 499 500 if (!pos) 501 pos = hsr_get_next_node(hsr, NULL, addr); 502 while (pos) { 503 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr); 504 if (res < 0) { 505 if (res == -EMSGSIZE) { 506 genlmsg_end(skb_out, msg_head); 507 genlmsg_unicast(genl_info_net(info), skb_out, 508 info->snd_portid); 509 restart = true; 510 goto restart; 511 } 512 goto nla_put_failure; 513 } 514 pos = hsr_get_next_node(hsr, pos, addr); 515 } 516 rcu_read_unlock(); 517 518 genlmsg_end(skb_out, msg_head); 519 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid); 520 521 return 0; 522 523 rcu_unlock: 524 rcu_read_unlock(); 525 invalid: 526 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL); 527 return 0; 528 529 nla_put_failure: 530 nlmsg_free(skb_out); 531 /* Fall through */ 532 533 fail: 534 rcu_read_unlock(); 535 return res; 536 } 537 538 static const struct genl_small_ops hsr_ops[] = { 539 { 540 .cmd = HSR_C_GET_NODE_STATUS, 541 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 542 .flags = 0, 543 .doit = hsr_get_node_status, 544 .dumpit = NULL, 545 }, 546 { 547 .cmd = HSR_C_GET_NODE_LIST, 548 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 549 .flags = 0, 550 .doit = hsr_get_node_list, 551 .dumpit = NULL, 552 }, 553 }; 554 555 static struct genl_family hsr_genl_family __ro_after_init = { 556 .hdrsize = 0, 557 .name = "HSR", 558 .version = 1, 559 .maxattr = HSR_A_MAX, 560 .policy = hsr_genl_policy, 561 .netnsok = true, 562 .module = THIS_MODULE, 563 .small_ops = hsr_ops, 564 .n_small_ops = ARRAY_SIZE(hsr_ops), 565 .resv_start_op = HSR_C_SET_NODE_LIST + 1, 566 .mcgrps = hsr_mcgrps, 567 .n_mcgrps = ARRAY_SIZE(hsr_mcgrps), 568 }; 569 570 int __init hsr_netlink_init(void) 571 { 572 int rc; 573 574 rc = rtnl_link_register(&hsr_link_ops); 575 if (rc) 576 goto fail_rtnl_link_register; 577 578 rc = genl_register_family(&hsr_genl_family); 579 if (rc) 580 goto fail_genl_register_family; 581 582 hsr_debugfs_create_root(); 583 return 0; 584 585 fail_genl_register_family: 586 rtnl_link_unregister(&hsr_link_ops); 587 fail_rtnl_link_register: 588 589 return rc; 590 } 591 592 void __exit hsr_netlink_exit(void) 593 { 594 genl_unregister_family(&hsr_genl_family); 595 rtnl_link_unregister(&hsr_link_ops); 596 } 597 598 MODULE_ALIAS_RTNL_LINK("hsr"); 599