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. 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 }; 26 27 /* Here, it seems a netdevice has already been allocated for us, and the 28 * hsr_dev_setup routine has been executed. Nice! 29 */ 30 static int hsr_newlink(struct net *src_net, struct net_device *dev, 31 struct nlattr *tb[], struct nlattr *data[], 32 struct netlink_ext_ack *extack) 33 { 34 struct net_device *link[2]; 35 unsigned char multicast_spec, hsr_version; 36 37 if (!data) { 38 netdev_info(dev, "HSR: No slave devices specified\n"); 39 return -EINVAL; 40 } 41 if (!data[IFLA_HSR_SLAVE1]) { 42 netdev_info(dev, "HSR: Slave1 device not specified\n"); 43 return -EINVAL; 44 } 45 link[0] = __dev_get_by_index(src_net, 46 nla_get_u32(data[IFLA_HSR_SLAVE1])); 47 if (!data[IFLA_HSR_SLAVE2]) { 48 netdev_info(dev, "HSR: Slave2 device not specified\n"); 49 return -EINVAL; 50 } 51 link[1] = __dev_get_by_index(src_net, 52 nla_get_u32(data[IFLA_HSR_SLAVE2])); 53 54 if (!link[0] || !link[1]) 55 return -ENODEV; 56 if (link[0] == link[1]) 57 return -EINVAL; 58 59 if (!data[IFLA_HSR_MULTICAST_SPEC]) 60 multicast_spec = 0; 61 else 62 multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]); 63 64 if (!data[IFLA_HSR_VERSION]) 65 hsr_version = 0; 66 else 67 hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]); 68 69 return hsr_dev_finalize(dev, link, multicast_spec, hsr_version); 70 } 71 72 static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev) 73 { 74 struct hsr_priv *hsr; 75 struct hsr_port *port; 76 int res; 77 78 hsr = netdev_priv(dev); 79 80 res = 0; 81 82 rcu_read_lock(); 83 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); 84 if (port) 85 res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex); 86 rcu_read_unlock(); 87 if (res) 88 goto nla_put_failure; 89 90 rcu_read_lock(); 91 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); 92 if (port) 93 res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex); 94 rcu_read_unlock(); 95 if (res) 96 goto nla_put_failure; 97 98 if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN, 99 hsr->sup_multicast_addr) || 100 nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr)) 101 goto nla_put_failure; 102 103 return 0; 104 105 nla_put_failure: 106 return -EMSGSIZE; 107 } 108 109 static struct rtnl_link_ops hsr_link_ops __read_mostly = { 110 .kind = "hsr", 111 .maxtype = IFLA_HSR_MAX, 112 .policy = hsr_policy, 113 .priv_size = sizeof(struct hsr_priv), 114 .setup = hsr_dev_setup, 115 .newlink = hsr_newlink, 116 .fill_info = hsr_fill_info, 117 }; 118 119 /* attribute policy */ 120 static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = { 121 [HSR_A_NODE_ADDR] = { .len = ETH_ALEN }, 122 [HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN }, 123 [HSR_A_IFINDEX] = { .type = NLA_U32 }, 124 [HSR_A_IF1_AGE] = { .type = NLA_U32 }, 125 [HSR_A_IF2_AGE] = { .type = NLA_U32 }, 126 [HSR_A_IF1_SEQ] = { .type = NLA_U16 }, 127 [HSR_A_IF2_SEQ] = { .type = NLA_U16 }, 128 }; 129 130 static struct genl_family hsr_genl_family; 131 132 static const struct genl_multicast_group hsr_mcgrps[] = { 133 { .name = "hsr-network", }, 134 }; 135 136 /* This is called if for some node with MAC address addr, we only get frames 137 * over one of the slave interfaces. This would indicate an open network ring 138 * (i.e. a link has failed somewhere). 139 */ 140 void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN], 141 struct hsr_port *port) 142 { 143 struct sk_buff *skb; 144 void *msg_head; 145 struct hsr_port *master; 146 int res; 147 148 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 149 if (!skb) 150 goto fail; 151 152 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, 153 HSR_C_RING_ERROR); 154 if (!msg_head) 155 goto nla_put_failure; 156 157 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); 158 if (res < 0) 159 goto nla_put_failure; 160 161 res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex); 162 if (res < 0) 163 goto nla_put_failure; 164 165 genlmsg_end(skb, msg_head); 166 genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC); 167 168 return; 169 170 nla_put_failure: 171 kfree_skb(skb); 172 173 fail: 174 rcu_read_lock(); 175 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 176 netdev_warn(master->dev, "Could not send HSR ring error message\n"); 177 rcu_read_unlock(); 178 } 179 180 /* This is called when we haven't heard from the node with MAC address addr for 181 * some time (just before the node is removed from the node table/list). 182 */ 183 void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN]) 184 { 185 struct sk_buff *skb; 186 void *msg_head; 187 struct hsr_port *master; 188 int res; 189 190 skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); 191 if (!skb) 192 goto fail; 193 194 msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN); 195 if (!msg_head) 196 goto nla_put_failure; 197 198 res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); 199 if (res < 0) 200 goto nla_put_failure; 201 202 genlmsg_end(skb, msg_head); 203 genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC); 204 205 return; 206 207 nla_put_failure: 208 kfree_skb(skb); 209 210 fail: 211 rcu_read_lock(); 212 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 213 netdev_warn(master->dev, "Could not send HSR node down\n"); 214 rcu_read_unlock(); 215 } 216 217 /* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table 218 * about the status of a specific node in the network, defined by its MAC 219 * address. 220 * 221 * Input: hsr ifindex, node mac address 222 * Output: hsr ifindex, node mac address (copied from request), 223 * age of latest frame from node over slave 1, slave 2 [ms] 224 */ 225 static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info) 226 { 227 /* For receiving */ 228 struct nlattr *na; 229 struct net_device *hsr_dev; 230 231 /* For sending */ 232 struct sk_buff *skb_out; 233 void *msg_head; 234 struct hsr_priv *hsr; 235 struct hsr_port *port; 236 unsigned char hsr_node_addr_b[ETH_ALEN]; 237 int hsr_node_if1_age; 238 u16 hsr_node_if1_seq; 239 int hsr_node_if2_age; 240 u16 hsr_node_if2_seq; 241 int addr_b_ifindex; 242 int res; 243 244 if (!info) 245 goto invalid; 246 247 na = info->attrs[HSR_A_IFINDEX]; 248 if (!na) 249 goto invalid; 250 na = info->attrs[HSR_A_NODE_ADDR]; 251 if (!na) 252 goto invalid; 253 254 hsr_dev = __dev_get_by_index(genl_info_net(info), 255 nla_get_u32(info->attrs[HSR_A_IFINDEX])); 256 if (!hsr_dev) 257 goto invalid; 258 if (!is_hsr_master(hsr_dev)) 259 goto invalid; 260 261 /* Send reply */ 262 skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 263 if (!skb_out) { 264 res = -ENOMEM; 265 goto fail; 266 } 267 268 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid, 269 info->snd_seq, &hsr_genl_family, 0, 270 HSR_C_SET_NODE_STATUS); 271 if (!msg_head) { 272 res = -ENOMEM; 273 goto nla_put_failure; 274 } 275 276 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); 277 if (res < 0) 278 goto nla_put_failure; 279 280 hsr = netdev_priv(hsr_dev); 281 res = hsr_get_node_data(hsr, 282 (unsigned char *) 283 nla_data(info->attrs[HSR_A_NODE_ADDR]), 284 hsr_node_addr_b, 285 &addr_b_ifindex, 286 &hsr_node_if1_age, 287 &hsr_node_if1_seq, 288 &hsr_node_if2_age, 289 &hsr_node_if2_seq); 290 if (res < 0) 291 goto nla_put_failure; 292 293 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, 294 nla_data(info->attrs[HSR_A_NODE_ADDR])); 295 if (res < 0) 296 goto nla_put_failure; 297 298 if (addr_b_ifindex > -1) { 299 res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN, 300 hsr_node_addr_b); 301 if (res < 0) 302 goto nla_put_failure; 303 304 res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, 305 addr_b_ifindex); 306 if (res < 0) 307 goto nla_put_failure; 308 } 309 310 res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age); 311 if (res < 0) 312 goto nla_put_failure; 313 res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq); 314 if (res < 0) 315 goto nla_put_failure; 316 rcu_read_lock(); 317 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); 318 if (port) 319 res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX, 320 port->dev->ifindex); 321 rcu_read_unlock(); 322 if (res < 0) 323 goto nla_put_failure; 324 325 res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age); 326 if (res < 0) 327 goto nla_put_failure; 328 res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq); 329 if (res < 0) 330 goto nla_put_failure; 331 rcu_read_lock(); 332 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); 333 if (port) 334 res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX, 335 port->dev->ifindex); 336 rcu_read_unlock(); 337 if (res < 0) 338 goto nla_put_failure; 339 340 genlmsg_end(skb_out, msg_head); 341 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid); 342 343 return 0; 344 345 invalid: 346 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL); 347 return 0; 348 349 nla_put_failure: 350 kfree_skb(skb_out); 351 /* Fall through */ 352 353 fail: 354 return res; 355 } 356 357 /* Get a list of MacAddressA of all nodes known to this node (including self). 358 */ 359 static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info) 360 { 361 /* For receiving */ 362 struct nlattr *na; 363 struct net_device *hsr_dev; 364 365 /* For sending */ 366 struct sk_buff *skb_out; 367 void *msg_head; 368 struct hsr_priv *hsr; 369 void *pos; 370 unsigned char addr[ETH_ALEN]; 371 int res; 372 373 if (!info) 374 goto invalid; 375 376 na = info->attrs[HSR_A_IFINDEX]; 377 if (!na) 378 goto invalid; 379 380 hsr_dev = __dev_get_by_index(genl_info_net(info), 381 nla_get_u32(info->attrs[HSR_A_IFINDEX])); 382 if (!hsr_dev) 383 goto invalid; 384 if (!is_hsr_master(hsr_dev)) 385 goto invalid; 386 387 /* Send reply */ 388 skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); 389 if (!skb_out) { 390 res = -ENOMEM; 391 goto fail; 392 } 393 394 msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid, 395 info->snd_seq, &hsr_genl_family, 0, 396 HSR_C_SET_NODE_LIST); 397 if (!msg_head) { 398 res = -ENOMEM; 399 goto nla_put_failure; 400 } 401 402 res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); 403 if (res < 0) 404 goto nla_put_failure; 405 406 hsr = netdev_priv(hsr_dev); 407 408 rcu_read_lock(); 409 pos = hsr_get_next_node(hsr, NULL, addr); 410 while (pos) { 411 res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr); 412 if (res < 0) { 413 rcu_read_unlock(); 414 goto nla_put_failure; 415 } 416 pos = hsr_get_next_node(hsr, pos, addr); 417 } 418 rcu_read_unlock(); 419 420 genlmsg_end(skb_out, msg_head); 421 genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid); 422 423 return 0; 424 425 invalid: 426 netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL); 427 return 0; 428 429 nla_put_failure: 430 kfree_skb(skb_out); 431 /* Fall through */ 432 433 fail: 434 return res; 435 } 436 437 static const struct genl_ops hsr_ops[] = { 438 { 439 .cmd = HSR_C_GET_NODE_STATUS, 440 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 441 .flags = 0, 442 .doit = hsr_get_node_status, 443 .dumpit = NULL, 444 }, 445 { 446 .cmd = HSR_C_GET_NODE_LIST, 447 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, 448 .flags = 0, 449 .doit = hsr_get_node_list, 450 .dumpit = NULL, 451 }, 452 }; 453 454 static struct genl_family hsr_genl_family __ro_after_init = { 455 .hdrsize = 0, 456 .name = "HSR", 457 .version = 1, 458 .maxattr = HSR_A_MAX, 459 .policy = hsr_genl_policy, 460 .module = THIS_MODULE, 461 .ops = hsr_ops, 462 .n_ops = ARRAY_SIZE(hsr_ops), 463 .mcgrps = hsr_mcgrps, 464 .n_mcgrps = ARRAY_SIZE(hsr_mcgrps), 465 }; 466 467 int __init hsr_netlink_init(void) 468 { 469 int rc; 470 471 rc = rtnl_link_register(&hsr_link_ops); 472 if (rc) 473 goto fail_rtnl_link_register; 474 475 rc = genl_register_family(&hsr_genl_family); 476 if (rc) 477 goto fail_genl_register_family; 478 479 hsr_debugfs_create_root(); 480 return 0; 481 482 fail_genl_register_family: 483 rtnl_link_unregister(&hsr_link_ops); 484 fail_rtnl_link_register: 485 486 return rc; 487 } 488 489 void __exit hsr_netlink_exit(void) 490 { 491 genl_unregister_family(&hsr_genl_family); 492 rtnl_link_unregister(&hsr_link_ops); 493 } 494 495 MODULE_ALIAS_RTNL_LINK("hsr"); 496