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 * This file contains device methods for creating, using and destroying 7 * virtual HSR or PRP devices. 8 */ 9 10 #include <linux/netdevice.h> 11 #include <linux/skbuff.h> 12 #include <linux/etherdevice.h> 13 #include <linux/rtnetlink.h> 14 #include <linux/pkt_sched.h> 15 #include "hsr_device.h" 16 #include "hsr_slave.h" 17 #include "hsr_framereg.h" 18 #include "hsr_main.h" 19 #include "hsr_forward.h" 20 21 static bool is_admin_up(struct net_device *dev) 22 { 23 return dev && (dev->flags & IFF_UP); 24 } 25 26 static bool is_slave_up(struct net_device *dev) 27 { 28 return dev && is_admin_up(dev) && netif_oper_up(dev); 29 } 30 31 static void __hsr_set_operstate(struct net_device *dev, int transition) 32 { 33 write_lock(&dev_base_lock); 34 if (READ_ONCE(dev->operstate) != transition) { 35 WRITE_ONCE(dev->operstate, transition); 36 write_unlock(&dev_base_lock); 37 netdev_state_change(dev); 38 } else { 39 write_unlock(&dev_base_lock); 40 } 41 } 42 43 static void hsr_set_operstate(struct hsr_port *master, bool has_carrier) 44 { 45 if (!is_admin_up(master->dev)) { 46 __hsr_set_operstate(master->dev, IF_OPER_DOWN); 47 return; 48 } 49 50 if (has_carrier) 51 __hsr_set_operstate(master->dev, IF_OPER_UP); 52 else 53 __hsr_set_operstate(master->dev, IF_OPER_LOWERLAYERDOWN); 54 } 55 56 static bool hsr_check_carrier(struct hsr_port *master) 57 { 58 struct hsr_port *port; 59 60 ASSERT_RTNL(); 61 62 hsr_for_each_port(master->hsr, port) { 63 if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) { 64 netif_carrier_on(master->dev); 65 return true; 66 } 67 } 68 69 netif_carrier_off(master->dev); 70 71 return false; 72 } 73 74 static void hsr_check_announce(struct net_device *hsr_dev) 75 { 76 struct hsr_priv *hsr; 77 78 hsr = netdev_priv(hsr_dev); 79 if (netif_running(hsr_dev) && netif_oper_up(hsr_dev)) { 80 /* Enable announce timer and start sending supervisory frames */ 81 if (!timer_pending(&hsr->announce_timer)) { 82 hsr->announce_count = 0; 83 mod_timer(&hsr->announce_timer, jiffies + 84 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL)); 85 } 86 } else { 87 /* Deactivate the announce timer */ 88 timer_delete(&hsr->announce_timer); 89 } 90 } 91 92 void hsr_check_carrier_and_operstate(struct hsr_priv *hsr) 93 { 94 struct hsr_port *master; 95 bool has_carrier; 96 97 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 98 /* netif_stacked_transfer_operstate() cannot be used here since 99 * it doesn't set IF_OPER_LOWERLAYERDOWN (?) 100 */ 101 has_carrier = hsr_check_carrier(master); 102 hsr_set_operstate(master, has_carrier); 103 hsr_check_announce(master->dev); 104 } 105 106 int hsr_get_max_mtu(struct hsr_priv *hsr) 107 { 108 unsigned int mtu_max; 109 struct hsr_port *port; 110 111 mtu_max = ETH_DATA_LEN; 112 hsr_for_each_port(hsr, port) 113 if (port->type != HSR_PT_MASTER) 114 mtu_max = min(port->dev->mtu, mtu_max); 115 116 if (mtu_max < HSR_HLEN) 117 return 0; 118 return mtu_max - HSR_HLEN; 119 } 120 121 static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) 122 { 123 struct hsr_priv *hsr; 124 125 hsr = netdev_priv(dev); 126 127 if (new_mtu > hsr_get_max_mtu(hsr)) { 128 netdev_info(dev, "A HSR master's MTU cannot be greater than the smallest MTU of its slaves minus the HSR Tag length (%d octets).\n", 129 HSR_HLEN); 130 return -EINVAL; 131 } 132 133 dev->mtu = new_mtu; 134 135 return 0; 136 } 137 138 static int hsr_dev_open(struct net_device *dev) 139 { 140 struct hsr_priv *hsr; 141 struct hsr_port *port; 142 char designation; 143 144 hsr = netdev_priv(dev); 145 designation = '\0'; 146 147 hsr_for_each_port(hsr, port) { 148 if (port->type == HSR_PT_MASTER) 149 continue; 150 switch (port->type) { 151 case HSR_PT_SLAVE_A: 152 designation = 'A'; 153 break; 154 case HSR_PT_SLAVE_B: 155 designation = 'B'; 156 break; 157 default: 158 designation = '?'; 159 } 160 if (!is_slave_up(port->dev)) 161 netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n", 162 designation, port->dev->name); 163 } 164 165 if (designation == '\0') 166 netdev_warn(dev, "No slave devices configured\n"); 167 168 return 0; 169 } 170 171 static int hsr_dev_close(struct net_device *dev) 172 { 173 /* Nothing to do here. */ 174 return 0; 175 } 176 177 static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr, 178 netdev_features_t features) 179 { 180 netdev_features_t mask; 181 struct hsr_port *port; 182 183 mask = features; 184 185 /* Mask out all features that, if supported by one device, should be 186 * enabled for all devices (see NETIF_F_ONE_FOR_ALL). 187 * 188 * Anything that's off in mask will not be enabled - so only things 189 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL, 190 * may become enabled. 191 */ 192 features &= ~NETIF_F_ONE_FOR_ALL; 193 hsr_for_each_port(hsr, port) 194 features = netdev_increment_features(features, 195 port->dev->features, 196 mask); 197 198 return features; 199 } 200 201 static netdev_features_t hsr_fix_features(struct net_device *dev, 202 netdev_features_t features) 203 { 204 struct hsr_priv *hsr = netdev_priv(dev); 205 206 return hsr_features_recompute(hsr, features); 207 } 208 209 static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) 210 { 211 struct hsr_priv *hsr = netdev_priv(dev); 212 struct hsr_port *master; 213 214 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 215 if (master) { 216 skb->dev = master->dev; 217 skb_reset_mac_header(skb); 218 skb_reset_mac_len(skb); 219 spin_lock_bh(&hsr->seqnr_lock); 220 hsr_forward_skb(skb, master); 221 spin_unlock_bh(&hsr->seqnr_lock); 222 } else { 223 dev_core_stats_tx_dropped_inc(dev); 224 dev_kfree_skb_any(skb); 225 } 226 return NETDEV_TX_OK; 227 } 228 229 static const struct header_ops hsr_header_ops = { 230 .create = eth_header, 231 .parse = eth_header_parse, 232 }; 233 234 static struct sk_buff *hsr_init_skb(struct hsr_port *master) 235 { 236 struct hsr_priv *hsr = master->hsr; 237 struct sk_buff *skb; 238 int hlen, tlen; 239 240 hlen = LL_RESERVED_SPACE(master->dev); 241 tlen = master->dev->needed_tailroom; 242 /* skb size is same for PRP/HSR frames, only difference 243 * being, for PRP it is a trailer and for HSR it is a 244 * header 245 */ 246 skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) + 247 sizeof(struct hsr_sup_payload) + hlen + tlen); 248 249 if (!skb) 250 return skb; 251 252 skb_reserve(skb, hlen); 253 skb->dev = master->dev; 254 skb->priority = TC_PRIO_CONTROL; 255 256 if (dev_hard_header(skb, skb->dev, ETH_P_PRP, 257 hsr->sup_multicast_addr, 258 skb->dev->dev_addr, skb->len) <= 0) 259 goto out; 260 261 skb_reset_mac_header(skb); 262 skb_reset_mac_len(skb); 263 skb_reset_network_header(skb); 264 skb_reset_transport_header(skb); 265 266 return skb; 267 out: 268 kfree_skb(skb); 269 270 return NULL; 271 } 272 273 static void send_hsr_supervision_frame(struct hsr_port *master, 274 unsigned long *interval) 275 { 276 struct hsr_priv *hsr = master->hsr; 277 __u8 type = HSR_TLV_LIFE_CHECK; 278 struct hsr_sup_payload *hsr_sp; 279 struct hsr_sup_tag *hsr_stag; 280 struct sk_buff *skb; 281 282 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); 283 if (hsr->announce_count < 3 && hsr->prot_version == 0) { 284 type = HSR_TLV_ANNOUNCE; 285 *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); 286 hsr->announce_count++; 287 } 288 289 skb = hsr_init_skb(master); 290 if (!skb) { 291 netdev_warn_once(master->dev, "HSR: Could not send supervision frame\n"); 292 return; 293 } 294 295 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); 296 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); 297 set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version); 298 299 /* From HSRv1 on we have separate supervision sequence numbers. */ 300 spin_lock_bh(&hsr->seqnr_lock); 301 if (hsr->prot_version > 0) { 302 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); 303 hsr->sup_sequence_nr++; 304 } else { 305 hsr_stag->sequence_nr = htons(hsr->sequence_nr); 306 hsr->sequence_nr++; 307 } 308 309 hsr_stag->tlv.HSR_TLV_type = type; 310 /* TODO: Why 12 in HSRv0? */ 311 hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ? 312 sizeof(struct hsr_sup_payload) : 12; 313 314 /* Payload: MacAddressA */ 315 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 316 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); 317 318 if (skb_put_padto(skb, ETH_ZLEN)) { 319 spin_unlock_bh(&hsr->seqnr_lock); 320 return; 321 } 322 323 hsr_forward_skb(skb, master); 324 spin_unlock_bh(&hsr->seqnr_lock); 325 return; 326 } 327 328 static void send_prp_supervision_frame(struct hsr_port *master, 329 unsigned long *interval) 330 { 331 struct hsr_priv *hsr = master->hsr; 332 struct hsr_sup_payload *hsr_sp; 333 struct hsr_sup_tag *hsr_stag; 334 struct sk_buff *skb; 335 336 skb = hsr_init_skb(master); 337 if (!skb) { 338 netdev_warn_once(master->dev, "PRP: Could not send supervision frame\n"); 339 return; 340 } 341 342 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); 343 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); 344 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); 345 set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0)); 346 347 /* From HSRv1 on we have separate supervision sequence numbers. */ 348 spin_lock_bh(&hsr->seqnr_lock); 349 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); 350 hsr->sup_sequence_nr++; 351 hsr_stag->tlv.HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD; 352 hsr_stag->tlv.HSR_TLV_length = sizeof(struct hsr_sup_payload); 353 354 /* Payload: MacAddressA */ 355 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 356 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); 357 358 if (skb_put_padto(skb, ETH_ZLEN)) { 359 spin_unlock_bh(&hsr->seqnr_lock); 360 return; 361 } 362 363 hsr_forward_skb(skb, master); 364 spin_unlock_bh(&hsr->seqnr_lock); 365 } 366 367 /* Announce (supervision frame) timer function 368 */ 369 static void hsr_announce(struct timer_list *t) 370 { 371 struct hsr_priv *hsr; 372 struct hsr_port *master; 373 unsigned long interval; 374 375 hsr = from_timer(hsr, t, announce_timer); 376 377 rcu_read_lock(); 378 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 379 hsr->proto_ops->send_sv_frame(master, &interval); 380 381 if (is_admin_up(master->dev)) 382 mod_timer(&hsr->announce_timer, jiffies + interval); 383 384 rcu_read_unlock(); 385 } 386 387 void hsr_del_ports(struct hsr_priv *hsr) 388 { 389 struct hsr_port *port; 390 391 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); 392 if (port) 393 hsr_del_port(port); 394 395 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); 396 if (port) 397 hsr_del_port(port); 398 399 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 400 if (port) 401 hsr_del_port(port); 402 } 403 404 static const struct net_device_ops hsr_device_ops = { 405 .ndo_change_mtu = hsr_dev_change_mtu, 406 .ndo_open = hsr_dev_open, 407 .ndo_stop = hsr_dev_close, 408 .ndo_start_xmit = hsr_dev_xmit, 409 .ndo_fix_features = hsr_fix_features, 410 }; 411 412 static struct device_type hsr_type = { 413 .name = "hsr", 414 }; 415 416 static struct hsr_proto_ops hsr_ops = { 417 .send_sv_frame = send_hsr_supervision_frame, 418 .create_tagged_frame = hsr_create_tagged_frame, 419 .get_untagged_frame = hsr_get_untagged_frame, 420 .drop_frame = hsr_drop_frame, 421 .fill_frame_info = hsr_fill_frame_info, 422 .invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame, 423 }; 424 425 static struct hsr_proto_ops prp_ops = { 426 .send_sv_frame = send_prp_supervision_frame, 427 .create_tagged_frame = prp_create_tagged_frame, 428 .get_untagged_frame = prp_get_untagged_frame, 429 .drop_frame = prp_drop_frame, 430 .fill_frame_info = prp_fill_frame_info, 431 .handle_san_frame = prp_handle_san_frame, 432 .update_san_info = prp_update_san_info, 433 }; 434 435 void hsr_dev_setup(struct net_device *dev) 436 { 437 eth_hw_addr_random(dev); 438 439 ether_setup(dev); 440 dev->min_mtu = 0; 441 dev->header_ops = &hsr_header_ops; 442 dev->netdev_ops = &hsr_device_ops; 443 SET_NETDEV_DEVTYPE(dev, &hsr_type); 444 dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL; 445 446 dev->needs_free_netdev = true; 447 448 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | 449 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | 450 NETIF_F_HW_VLAN_CTAG_TX; 451 452 dev->features = dev->hw_features; 453 454 /* Prevent recursive tx locking */ 455 dev->features |= NETIF_F_LLTX; 456 /* VLAN on top of HSR needs testing and probably some work on 457 * hsr_header_create() etc. 458 */ 459 dev->features |= NETIF_F_VLAN_CHALLENGED; 460 /* Not sure about this. Taken from bridge code. netdev_features.h says 461 * it means "Does not change network namespaces". 462 */ 463 dev->features |= NETIF_F_NETNS_LOCAL; 464 } 465 466 /* Return true if dev is a HSR master; return false otherwise. 467 */ 468 bool is_hsr_master(struct net_device *dev) 469 { 470 return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); 471 } 472 EXPORT_SYMBOL(is_hsr_master); 473 474 /* Default multicast address for HSR Supervision frames */ 475 static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = { 476 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00 477 }; 478 479 int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], 480 unsigned char multicast_spec, u8 protocol_version, 481 struct netlink_ext_ack *extack) 482 { 483 bool unregister = false; 484 struct hsr_priv *hsr; 485 int res; 486 487 hsr = netdev_priv(hsr_dev); 488 INIT_LIST_HEAD(&hsr->ports); 489 INIT_LIST_HEAD(&hsr->node_db); 490 spin_lock_init(&hsr->list_lock); 491 492 eth_hw_addr_set(hsr_dev, slave[0]->dev_addr); 493 494 /* initialize protocol specific functions */ 495 if (protocol_version == PRP_V1) { 496 /* For PRP, lan_id has most significant 3 bits holding 497 * the net_id of PRP_LAN_ID 498 */ 499 hsr->net_id = PRP_LAN_ID << 1; 500 hsr->proto_ops = &prp_ops; 501 } else { 502 hsr->proto_ops = &hsr_ops; 503 } 504 505 /* Make sure we recognize frames from ourselves in hsr_rcv() */ 506 res = hsr_create_self_node(hsr, hsr_dev->dev_addr, 507 slave[1]->dev_addr); 508 if (res < 0) 509 return res; 510 511 spin_lock_init(&hsr->seqnr_lock); 512 /* Overflow soon to find bugs easier: */ 513 hsr->sequence_nr = HSR_SEQNR_START; 514 hsr->sup_sequence_nr = HSR_SUP_SEQNR_START; 515 516 timer_setup(&hsr->announce_timer, hsr_announce, 0); 517 timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0); 518 519 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr); 520 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; 521 522 hsr->prot_version = protocol_version; 523 524 /* Make sure the 1st call to netif_carrier_on() gets through */ 525 netif_carrier_off(hsr_dev); 526 527 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack); 528 if (res) 529 goto err_add_master; 530 531 /* HSR forwarding offload supported in lower device? */ 532 if ((slave[0]->features & NETIF_F_HW_HSR_FWD) && 533 (slave[1]->features & NETIF_F_HW_HSR_FWD)) 534 hsr->fwd_offloaded = true; 535 536 res = register_netdevice(hsr_dev); 537 if (res) 538 goto err_unregister; 539 540 unregister = true; 541 542 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack); 543 if (res) 544 goto err_unregister; 545 546 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack); 547 if (res) 548 goto err_unregister; 549 550 hsr_debugfs_init(hsr, hsr_dev); 551 mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD)); 552 553 return 0; 554 555 err_unregister: 556 hsr_del_ports(hsr); 557 err_add_master: 558 hsr_del_self_node(hsr); 559 560 if (unregister) 561 unregister_netdevice(hsr_dev); 562 return res; 563 } 564