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 hsr_port *master, bool has_carrier) 32 { 33 struct net_device *dev = master->dev; 34 35 if (!is_admin_up(dev)) { 36 netdev_set_operstate(dev, IF_OPER_DOWN); 37 return; 38 } 39 40 if (has_carrier) 41 netdev_set_operstate(dev, IF_OPER_UP); 42 else 43 netdev_set_operstate(dev, IF_OPER_LOWERLAYERDOWN); 44 } 45 46 static bool hsr_check_carrier(struct hsr_port *master) 47 { 48 struct hsr_port *port; 49 50 ASSERT_RTNL(); 51 52 hsr_for_each_port(master->hsr, port) { 53 if (port->type != HSR_PT_MASTER && is_slave_up(port->dev)) { 54 netif_carrier_on(master->dev); 55 return true; 56 } 57 } 58 59 netif_carrier_off(master->dev); 60 61 return false; 62 } 63 64 static void hsr_check_announce(struct net_device *hsr_dev) 65 { 66 struct hsr_priv *hsr; 67 68 hsr = netdev_priv(hsr_dev); 69 if (netif_running(hsr_dev) && netif_oper_up(hsr_dev)) { 70 /* Enable announce timer and start sending supervisory frames */ 71 if (!timer_pending(&hsr->announce_timer)) { 72 hsr->announce_count = 0; 73 mod_timer(&hsr->announce_timer, jiffies + 74 msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL)); 75 } 76 } else { 77 /* Deactivate the announce timer */ 78 timer_delete(&hsr->announce_timer); 79 } 80 } 81 82 void hsr_check_carrier_and_operstate(struct hsr_priv *hsr) 83 { 84 struct hsr_port *master; 85 bool has_carrier; 86 87 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 88 /* netif_stacked_transfer_operstate() cannot be used here since 89 * it doesn't set IF_OPER_LOWERLAYERDOWN (?) 90 */ 91 has_carrier = hsr_check_carrier(master); 92 hsr_set_operstate(master, has_carrier); 93 hsr_check_announce(master->dev); 94 } 95 96 int hsr_get_max_mtu(struct hsr_priv *hsr) 97 { 98 unsigned int mtu_max; 99 struct hsr_port *port; 100 101 mtu_max = ETH_DATA_LEN; 102 hsr_for_each_port(hsr, port) 103 if (port->type != HSR_PT_MASTER) 104 mtu_max = min(port->dev->mtu, mtu_max); 105 106 if (mtu_max < HSR_HLEN) 107 return 0; 108 return mtu_max - HSR_HLEN; 109 } 110 111 static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) 112 { 113 struct hsr_priv *hsr; 114 115 hsr = netdev_priv(dev); 116 117 if (new_mtu > hsr_get_max_mtu(hsr)) { 118 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", 119 HSR_HLEN); 120 return -EINVAL; 121 } 122 123 WRITE_ONCE(dev->mtu, new_mtu); 124 125 return 0; 126 } 127 128 static int hsr_dev_open(struct net_device *dev) 129 { 130 struct hsr_priv *hsr; 131 struct hsr_port *port; 132 const char *designation = NULL; 133 134 hsr = netdev_priv(dev); 135 136 hsr_for_each_port(hsr, port) { 137 if (port->type == HSR_PT_MASTER) 138 continue; 139 switch (port->type) { 140 case HSR_PT_SLAVE_A: 141 designation = "Slave A"; 142 break; 143 case HSR_PT_SLAVE_B: 144 designation = "Slave B"; 145 break; 146 case HSR_PT_INTERLINK: 147 designation = "Interlink"; 148 break; 149 default: 150 designation = "Unknown"; 151 } 152 if (!is_slave_up(port->dev)) 153 netdev_warn(dev, "%s (%s) is not up; please bring it up to get a fully working HSR network\n", 154 designation, port->dev->name); 155 } 156 157 if (!designation) 158 netdev_warn(dev, "No slave devices configured\n"); 159 160 return 0; 161 } 162 163 static int hsr_dev_close(struct net_device *dev) 164 { 165 struct hsr_port *port; 166 struct hsr_priv *hsr; 167 168 hsr = netdev_priv(dev); 169 hsr_for_each_port(hsr, port) { 170 if (port->type == HSR_PT_MASTER) 171 continue; 172 switch (port->type) { 173 case HSR_PT_SLAVE_A: 174 case HSR_PT_SLAVE_B: 175 dev_uc_unsync(port->dev, dev); 176 dev_mc_unsync(port->dev, dev); 177 break; 178 default: 179 break; 180 } 181 } 182 183 return 0; 184 } 185 186 static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr, 187 netdev_features_t features) 188 { 189 netdev_features_t mask; 190 struct hsr_port *port; 191 192 mask = features; 193 194 /* Mask out all features that, if supported by one device, should be 195 * enabled for all devices (see NETIF_F_ONE_FOR_ALL). 196 * 197 * Anything that's off in mask will not be enabled - so only things 198 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL, 199 * may become enabled. 200 */ 201 features &= ~NETIF_F_ONE_FOR_ALL; 202 hsr_for_each_port(hsr, port) 203 features = netdev_increment_features(features, 204 port->dev->features, 205 mask); 206 207 return features; 208 } 209 210 static netdev_features_t hsr_fix_features(struct net_device *dev, 211 netdev_features_t features) 212 { 213 struct hsr_priv *hsr = netdev_priv(dev); 214 215 return hsr_features_recompute(hsr, features); 216 } 217 218 static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) 219 { 220 struct hsr_priv *hsr = netdev_priv(dev); 221 struct hsr_port *master; 222 223 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 224 if (master) { 225 skb->dev = master->dev; 226 skb_reset_mac_header(skb); 227 skb_reset_mac_len(skb); 228 spin_lock_bh(&hsr->seqnr_lock); 229 hsr_forward_skb(skb, master); 230 spin_unlock_bh(&hsr->seqnr_lock); 231 } else { 232 dev_core_stats_tx_dropped_inc(dev); 233 dev_kfree_skb_any(skb); 234 } 235 return NETDEV_TX_OK; 236 } 237 238 static const struct header_ops hsr_header_ops = { 239 .create = eth_header, 240 .parse = eth_header_parse, 241 }; 242 243 static struct sk_buff *hsr_init_skb(struct hsr_port *master) 244 { 245 struct hsr_priv *hsr = master->hsr; 246 struct sk_buff *skb; 247 int hlen, tlen; 248 249 hlen = LL_RESERVED_SPACE(master->dev); 250 tlen = master->dev->needed_tailroom; 251 /* skb size is same for PRP/HSR frames, only difference 252 * being, for PRP it is a trailer and for HSR it is a 253 * header 254 */ 255 skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) + 256 sizeof(struct hsr_sup_payload) + hlen + tlen); 257 258 if (!skb) 259 return skb; 260 261 skb_reserve(skb, hlen); 262 skb->dev = master->dev; 263 skb->priority = TC_PRIO_CONTROL; 264 265 if (dev_hard_header(skb, skb->dev, ETH_P_PRP, 266 hsr->sup_multicast_addr, 267 skb->dev->dev_addr, skb->len) <= 0) 268 goto out; 269 270 skb_reset_mac_header(skb); 271 skb_reset_mac_len(skb); 272 skb_reset_network_header(skb); 273 skb_reset_transport_header(skb); 274 275 return skb; 276 out: 277 kfree_skb(skb); 278 279 return NULL; 280 } 281 282 static void send_hsr_supervision_frame(struct hsr_port *master, 283 unsigned long *interval) 284 { 285 struct hsr_priv *hsr = master->hsr; 286 __u8 type = HSR_TLV_LIFE_CHECK; 287 struct hsr_sup_payload *hsr_sp; 288 struct hsr_sup_tlv *hsr_stlv; 289 struct hsr_sup_tag *hsr_stag; 290 struct sk_buff *skb; 291 292 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); 293 if (hsr->announce_count < 3 && hsr->prot_version == 0) { 294 type = HSR_TLV_ANNOUNCE; 295 *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); 296 hsr->announce_count++; 297 } 298 299 skb = hsr_init_skb(master); 300 if (!skb) { 301 netdev_warn_once(master->dev, "HSR: Could not send supervision frame\n"); 302 return; 303 } 304 305 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); 306 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); 307 set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version); 308 309 /* From HSRv1 on we have separate supervision sequence numbers. */ 310 spin_lock_bh(&hsr->seqnr_lock); 311 if (hsr->prot_version > 0) { 312 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); 313 hsr->sup_sequence_nr++; 314 } else { 315 hsr_stag->sequence_nr = htons(hsr->sequence_nr); 316 hsr->sequence_nr++; 317 } 318 319 hsr_stag->tlv.HSR_TLV_type = type; 320 /* TODO: Why 12 in HSRv0? */ 321 hsr_stag->tlv.HSR_TLV_length = hsr->prot_version ? 322 sizeof(struct hsr_sup_payload) : 12; 323 324 /* Payload: MacAddressA */ 325 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 326 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); 327 328 if (hsr->redbox) { 329 hsr_stlv = skb_put(skb, sizeof(struct hsr_sup_tlv)); 330 hsr_stlv->HSR_TLV_type = PRP_TLV_REDBOX_MAC; 331 hsr_stlv->HSR_TLV_length = sizeof(struct hsr_sup_payload); 332 333 /* Payload: MacAddressRedBox */ 334 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 335 ether_addr_copy(hsr_sp->macaddress_A, hsr->macaddress_redbox); 336 } 337 338 if (skb_put_padto(skb, ETH_ZLEN)) { 339 spin_unlock_bh(&hsr->seqnr_lock); 340 return; 341 } 342 343 hsr_forward_skb(skb, master); 344 spin_unlock_bh(&hsr->seqnr_lock); 345 return; 346 } 347 348 static void send_prp_supervision_frame(struct hsr_port *master, 349 unsigned long *interval) 350 { 351 struct hsr_priv *hsr = master->hsr; 352 struct hsr_sup_payload *hsr_sp; 353 struct hsr_sup_tag *hsr_stag; 354 struct sk_buff *skb; 355 356 skb = hsr_init_skb(master); 357 if (!skb) { 358 netdev_warn_once(master->dev, "PRP: Could not send supervision frame\n"); 359 return; 360 } 361 362 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); 363 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); 364 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); 365 set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0)); 366 367 /* From HSRv1 on we have separate supervision sequence numbers. */ 368 spin_lock_bh(&hsr->seqnr_lock); 369 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); 370 hsr->sup_sequence_nr++; 371 hsr_stag->tlv.HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD; 372 hsr_stag->tlv.HSR_TLV_length = sizeof(struct hsr_sup_payload); 373 374 /* Payload: MacAddressA */ 375 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 376 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); 377 378 if (skb_put_padto(skb, ETH_ZLEN)) { 379 spin_unlock_bh(&hsr->seqnr_lock); 380 return; 381 } 382 383 hsr_forward_skb(skb, master); 384 spin_unlock_bh(&hsr->seqnr_lock); 385 } 386 387 /* Announce (supervision frame) timer function 388 */ 389 static void hsr_announce(struct timer_list *t) 390 { 391 struct hsr_priv *hsr; 392 struct hsr_port *master; 393 unsigned long interval; 394 395 hsr = from_timer(hsr, t, announce_timer); 396 397 rcu_read_lock(); 398 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 399 hsr->proto_ops->send_sv_frame(master, &interval); 400 401 if (is_admin_up(master->dev)) 402 mod_timer(&hsr->announce_timer, jiffies + interval); 403 404 rcu_read_unlock(); 405 } 406 407 void hsr_del_ports(struct hsr_priv *hsr) 408 { 409 struct hsr_port *port; 410 411 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); 412 if (port) 413 hsr_del_port(port); 414 415 port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); 416 if (port) 417 hsr_del_port(port); 418 419 port = hsr_port_get_hsr(hsr, HSR_PT_INTERLINK); 420 if (port) 421 hsr_del_port(port); 422 423 port = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 424 if (port) 425 hsr_del_port(port); 426 } 427 428 static void hsr_set_rx_mode(struct net_device *dev) 429 { 430 struct hsr_port *port; 431 struct hsr_priv *hsr; 432 433 hsr = netdev_priv(dev); 434 435 hsr_for_each_port(hsr, port) { 436 if (port->type == HSR_PT_MASTER) 437 continue; 438 switch (port->type) { 439 case HSR_PT_SLAVE_A: 440 case HSR_PT_SLAVE_B: 441 dev_mc_sync_multiple(port->dev, dev); 442 dev_uc_sync_multiple(port->dev, dev); 443 break; 444 default: 445 break; 446 } 447 } 448 } 449 450 static void hsr_change_rx_flags(struct net_device *dev, int change) 451 { 452 struct hsr_port *port; 453 struct hsr_priv *hsr; 454 455 hsr = netdev_priv(dev); 456 457 hsr_for_each_port(hsr, port) { 458 if (port->type == HSR_PT_MASTER) 459 continue; 460 switch (port->type) { 461 case HSR_PT_SLAVE_A: 462 case HSR_PT_SLAVE_B: 463 if (change & IFF_ALLMULTI) 464 dev_set_allmulti(port->dev, 465 dev->flags & 466 IFF_ALLMULTI ? 1 : -1); 467 break; 468 default: 469 break; 470 } 471 } 472 } 473 474 static const struct net_device_ops hsr_device_ops = { 475 .ndo_change_mtu = hsr_dev_change_mtu, 476 .ndo_open = hsr_dev_open, 477 .ndo_stop = hsr_dev_close, 478 .ndo_start_xmit = hsr_dev_xmit, 479 .ndo_change_rx_flags = hsr_change_rx_flags, 480 .ndo_fix_features = hsr_fix_features, 481 .ndo_set_rx_mode = hsr_set_rx_mode, 482 }; 483 484 static const struct device_type hsr_type = { 485 .name = "hsr", 486 }; 487 488 static struct hsr_proto_ops hsr_ops = { 489 .send_sv_frame = send_hsr_supervision_frame, 490 .create_tagged_frame = hsr_create_tagged_frame, 491 .get_untagged_frame = hsr_get_untagged_frame, 492 .drop_frame = hsr_drop_frame, 493 .fill_frame_info = hsr_fill_frame_info, 494 .invalid_dan_ingress_frame = hsr_invalid_dan_ingress_frame, 495 }; 496 497 static struct hsr_proto_ops prp_ops = { 498 .send_sv_frame = send_prp_supervision_frame, 499 .create_tagged_frame = prp_create_tagged_frame, 500 .get_untagged_frame = prp_get_untagged_frame, 501 .drop_frame = prp_drop_frame, 502 .fill_frame_info = prp_fill_frame_info, 503 .handle_san_frame = prp_handle_san_frame, 504 .update_san_info = prp_update_san_info, 505 }; 506 507 void hsr_dev_setup(struct net_device *dev) 508 { 509 eth_hw_addr_random(dev); 510 511 ether_setup(dev); 512 dev->min_mtu = 0; 513 dev->header_ops = &hsr_header_ops; 514 dev->netdev_ops = &hsr_device_ops; 515 SET_NETDEV_DEVTYPE(dev, &hsr_type); 516 dev->priv_flags |= IFF_NO_QUEUE | IFF_DISABLE_NETPOLL; 517 518 dev->needs_free_netdev = true; 519 520 dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HIGHDMA | 521 NETIF_F_GSO_MASK | NETIF_F_HW_CSUM | 522 NETIF_F_HW_VLAN_CTAG_TX; 523 524 dev->features = dev->hw_features; 525 526 /* Prevent recursive tx locking */ 527 dev->features |= NETIF_F_LLTX; 528 /* VLAN on top of HSR needs testing and probably some work on 529 * hsr_header_create() etc. 530 */ 531 dev->features |= NETIF_F_VLAN_CHALLENGED; 532 /* Not sure about this. Taken from bridge code. netdev_features.h says 533 * it means "Does not change network namespaces". 534 */ 535 dev->features |= NETIF_F_NETNS_LOCAL; 536 } 537 538 /* Return true if dev is a HSR master; return false otherwise. 539 */ 540 bool is_hsr_master(struct net_device *dev) 541 { 542 return (dev->netdev_ops->ndo_start_xmit == hsr_dev_xmit); 543 } 544 EXPORT_SYMBOL(is_hsr_master); 545 546 /* Default multicast address for HSR Supervision frames */ 547 static const unsigned char def_multicast_addr[ETH_ALEN] __aligned(2) = { 548 0x01, 0x15, 0x4e, 0x00, 0x01, 0x00 549 }; 550 551 int hsr_dev_finalize(struct net_device *hsr_dev, struct net_device *slave[2], 552 struct net_device *interlink, unsigned char multicast_spec, 553 u8 protocol_version, struct netlink_ext_ack *extack) 554 { 555 bool unregister = false; 556 struct hsr_priv *hsr; 557 int res; 558 559 hsr = netdev_priv(hsr_dev); 560 INIT_LIST_HEAD(&hsr->ports); 561 INIT_LIST_HEAD(&hsr->node_db); 562 INIT_LIST_HEAD(&hsr->proxy_node_db); 563 spin_lock_init(&hsr->list_lock); 564 565 eth_hw_addr_set(hsr_dev, slave[0]->dev_addr); 566 567 /* initialize protocol specific functions */ 568 if (protocol_version == PRP_V1) { 569 /* For PRP, lan_id has most significant 3 bits holding 570 * the net_id of PRP_LAN_ID 571 */ 572 hsr->net_id = PRP_LAN_ID << 1; 573 hsr->proto_ops = &prp_ops; 574 } else { 575 hsr->proto_ops = &hsr_ops; 576 } 577 578 /* Make sure we recognize frames from ourselves in hsr_rcv() */ 579 res = hsr_create_self_node(hsr, hsr_dev->dev_addr, 580 slave[1]->dev_addr); 581 if (res < 0) 582 return res; 583 584 spin_lock_init(&hsr->seqnr_lock); 585 /* Overflow soon to find bugs easier: */ 586 hsr->sequence_nr = HSR_SEQNR_START; 587 hsr->sup_sequence_nr = HSR_SUP_SEQNR_START; 588 hsr->interlink_sequence_nr = HSR_SEQNR_START; 589 590 timer_setup(&hsr->announce_timer, hsr_announce, 0); 591 timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0); 592 timer_setup(&hsr->prune_proxy_timer, hsr_prune_proxy_nodes, 0); 593 594 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr); 595 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; 596 597 hsr->prot_version = protocol_version; 598 599 /* Make sure the 1st call to netif_carrier_on() gets through */ 600 netif_carrier_off(hsr_dev); 601 602 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack); 603 if (res) 604 goto err_add_master; 605 606 /* HSR forwarding offload supported in lower device? */ 607 if ((slave[0]->features & NETIF_F_HW_HSR_FWD) && 608 (slave[1]->features & NETIF_F_HW_HSR_FWD)) 609 hsr->fwd_offloaded = true; 610 611 res = register_netdevice(hsr_dev); 612 if (res) 613 goto err_unregister; 614 615 unregister = true; 616 617 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack); 618 if (res) 619 goto err_unregister; 620 621 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack); 622 if (res) 623 goto err_unregister; 624 625 if (interlink) { 626 res = hsr_add_port(hsr, interlink, HSR_PT_INTERLINK, extack); 627 if (res) 628 goto err_unregister; 629 630 hsr->redbox = true; 631 ether_addr_copy(hsr->macaddress_redbox, interlink->dev_addr); 632 mod_timer(&hsr->prune_proxy_timer, 633 jiffies + msecs_to_jiffies(PRUNE_PROXY_PERIOD)); 634 } 635 636 hsr_debugfs_init(hsr, hsr_dev); 637 mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD)); 638 639 return 0; 640 641 err_unregister: 642 hsr_del_ports(hsr); 643 err_add_master: 644 hsr_del_self_node(hsr); 645 646 if (unregister) 647 unregister_netdevice(hsr_dev); 648 return res; 649 } 650