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_bh(&dev_base_lock); 34 if (dev->operstate != transition) { 35 dev->operstate = transition; 36 write_unlock_bh(&dev_base_lock); 37 netdev_state_change(dev); 38 } else { 39 write_unlock_bh(&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 unsigned char old_operstate) 76 { 77 struct hsr_priv *hsr; 78 79 hsr = netdev_priv(hsr_dev); 80 81 if (hsr_dev->operstate == IF_OPER_UP && old_operstate != IF_OPER_UP) { 82 /* Went up */ 83 hsr->announce_count = 0; 84 mod_timer(&hsr->announce_timer, 85 jiffies + msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL)); 86 } 87 88 if (hsr_dev->operstate != IF_OPER_UP && old_operstate == IF_OPER_UP) 89 /* Went down */ 90 del_timer(&hsr->announce_timer); 91 } 92 93 void hsr_check_carrier_and_operstate(struct hsr_priv *hsr) 94 { 95 struct hsr_port *master; 96 unsigned char old_operstate; 97 bool has_carrier; 98 99 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 100 /* netif_stacked_transfer_operstate() cannot be used here since 101 * it doesn't set IF_OPER_LOWERLAYERDOWN (?) 102 */ 103 old_operstate = master->dev->operstate; 104 has_carrier = hsr_check_carrier(master); 105 hsr_set_operstate(master, has_carrier); 106 hsr_check_announce(master->dev, old_operstate); 107 } 108 109 int hsr_get_max_mtu(struct hsr_priv *hsr) 110 { 111 unsigned int mtu_max; 112 struct hsr_port *port; 113 114 mtu_max = ETH_DATA_LEN; 115 hsr_for_each_port(hsr, port) 116 if (port->type != HSR_PT_MASTER) 117 mtu_max = min(port->dev->mtu, mtu_max); 118 119 if (mtu_max < HSR_HLEN) 120 return 0; 121 return mtu_max - HSR_HLEN; 122 } 123 124 static int hsr_dev_change_mtu(struct net_device *dev, int new_mtu) 125 { 126 struct hsr_priv *hsr; 127 128 hsr = netdev_priv(dev); 129 130 if (new_mtu > hsr_get_max_mtu(hsr)) { 131 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", 132 HSR_HLEN); 133 return -EINVAL; 134 } 135 136 dev->mtu = new_mtu; 137 138 return 0; 139 } 140 141 static int hsr_dev_open(struct net_device *dev) 142 { 143 struct hsr_priv *hsr; 144 struct hsr_port *port; 145 char designation; 146 147 hsr = netdev_priv(dev); 148 designation = '\0'; 149 150 hsr_for_each_port(hsr, port) { 151 if (port->type == HSR_PT_MASTER) 152 continue; 153 switch (port->type) { 154 case HSR_PT_SLAVE_A: 155 designation = 'A'; 156 break; 157 case HSR_PT_SLAVE_B: 158 designation = 'B'; 159 break; 160 default: 161 designation = '?'; 162 } 163 if (!is_slave_up(port->dev)) 164 netdev_warn(dev, "Slave %c (%s) is not up; please bring it up to get a fully working HSR network\n", 165 designation, port->dev->name); 166 } 167 168 if (designation == '\0') 169 netdev_warn(dev, "No slave devices configured\n"); 170 171 return 0; 172 } 173 174 static int hsr_dev_close(struct net_device *dev) 175 { 176 /* Nothing to do here. */ 177 return 0; 178 } 179 180 static netdev_features_t hsr_features_recompute(struct hsr_priv *hsr, 181 netdev_features_t features) 182 { 183 netdev_features_t mask; 184 struct hsr_port *port; 185 186 mask = features; 187 188 /* Mask out all features that, if supported by one device, should be 189 * enabled for all devices (see NETIF_F_ONE_FOR_ALL). 190 * 191 * Anything that's off in mask will not be enabled - so only things 192 * that were in features originally, and also is in NETIF_F_ONE_FOR_ALL, 193 * may become enabled. 194 */ 195 features &= ~NETIF_F_ONE_FOR_ALL; 196 hsr_for_each_port(hsr, port) 197 features = netdev_increment_features(features, 198 port->dev->features, 199 mask); 200 201 return features; 202 } 203 204 static netdev_features_t hsr_fix_features(struct net_device *dev, 205 netdev_features_t features) 206 { 207 struct hsr_priv *hsr = netdev_priv(dev); 208 209 return hsr_features_recompute(hsr, features); 210 } 211 212 static netdev_tx_t hsr_dev_xmit(struct sk_buff *skb, struct net_device *dev) 213 { 214 struct hsr_priv *hsr = netdev_priv(dev); 215 struct hsr_port *master; 216 217 master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); 218 if (master) { 219 skb->dev = master->dev; 220 hsr_forward_skb(skb, master); 221 } else { 222 atomic_long_inc(&dev->tx_dropped); 223 dev_kfree_skb_any(skb); 224 } 225 return NETDEV_TX_OK; 226 } 227 228 static const struct header_ops hsr_header_ops = { 229 .create = eth_header, 230 .parse = eth_header_parse, 231 }; 232 233 static struct sk_buff *hsr_init_skb(struct hsr_port *master) 234 { 235 struct hsr_priv *hsr = master->hsr; 236 struct sk_buff *skb; 237 int hlen, tlen; 238 239 hlen = LL_RESERVED_SPACE(master->dev); 240 tlen = master->dev->needed_tailroom; 241 /* skb size is same for PRP/HSR frames, only difference 242 * being, for PRP it is a trailer and for HSR it is a 243 * header 244 */ 245 skb = dev_alloc_skb(sizeof(struct hsr_sup_tag) + 246 sizeof(struct hsr_sup_payload) + hlen + tlen); 247 248 if (!skb) 249 return skb; 250 251 skb_reserve(skb, hlen); 252 skb->dev = master->dev; 253 skb->priority = TC_PRIO_CONTROL; 254 255 if (dev_hard_header(skb, skb->dev, ETH_P_PRP, 256 hsr->sup_multicast_addr, 257 skb->dev->dev_addr, skb->len) <= 0) 258 goto out; 259 260 skb_reset_mac_header(skb); 261 skb_reset_network_header(skb); 262 skb_reset_transport_header(skb); 263 264 return skb; 265 out: 266 kfree_skb(skb); 267 268 return NULL; 269 } 270 271 static void send_hsr_supervision_frame(struct hsr_port *master, 272 unsigned long *interval) 273 { 274 struct hsr_priv *hsr = master->hsr; 275 __u8 type = HSR_TLV_LIFE_CHECK; 276 struct hsr_sup_payload *hsr_sp; 277 struct hsr_sup_tag *hsr_stag; 278 unsigned long irqflags; 279 struct sk_buff *skb; 280 281 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); 282 if (hsr->announce_count < 3 && hsr->prot_version == 0) { 283 type = HSR_TLV_ANNOUNCE; 284 *interval = msecs_to_jiffies(HSR_ANNOUNCE_INTERVAL); 285 hsr->announce_count++; 286 } 287 288 skb = hsr_init_skb(master); 289 if (!skb) { 290 WARN_ONCE(1, "HSR: Could not send supervision frame\n"); 291 return; 292 } 293 294 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); 295 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); 296 set_hsr_stag_HSR_ver(hsr_stag, hsr->prot_version); 297 298 /* From HSRv1 on we have separate supervision sequence numbers. */ 299 spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags); 300 if (hsr->prot_version > 0) { 301 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); 302 hsr->sup_sequence_nr++; 303 } else { 304 hsr_stag->sequence_nr = htons(hsr->sequence_nr); 305 hsr->sequence_nr++; 306 } 307 spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); 308 309 hsr_stag->HSR_TLV_type = type; 310 /* TODO: Why 12 in HSRv0? */ 311 hsr_stag->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 return; 320 321 hsr_forward_skb(skb, master); 322 323 return; 324 } 325 326 static void send_prp_supervision_frame(struct hsr_port *master, 327 unsigned long *interval) 328 { 329 struct hsr_priv *hsr = master->hsr; 330 struct hsr_sup_payload *hsr_sp; 331 struct hsr_sup_tag *hsr_stag; 332 unsigned long irqflags; 333 struct sk_buff *skb; 334 335 skb = hsr_init_skb(master); 336 if (!skb) { 337 WARN_ONCE(1, "PRP: Could not send supervision frame\n"); 338 return; 339 } 340 341 *interval = msecs_to_jiffies(HSR_LIFE_CHECK_INTERVAL); 342 hsr_stag = skb_put(skb, sizeof(struct hsr_sup_tag)); 343 set_hsr_stag_path(hsr_stag, (hsr->prot_version ? 0x0 : 0xf)); 344 set_hsr_stag_HSR_ver(hsr_stag, (hsr->prot_version ? 1 : 0)); 345 346 /* From HSRv1 on we have separate supervision sequence numbers. */ 347 spin_lock_irqsave(&master->hsr->seqnr_lock, irqflags); 348 hsr_stag->sequence_nr = htons(hsr->sup_sequence_nr); 349 hsr->sup_sequence_nr++; 350 hsr_stag->HSR_TLV_type = PRP_TLV_LIFE_CHECK_DD; 351 hsr_stag->HSR_TLV_length = sizeof(struct hsr_sup_payload); 352 353 /* Payload: MacAddressA */ 354 hsr_sp = skb_put(skb, sizeof(struct hsr_sup_payload)); 355 ether_addr_copy(hsr_sp->macaddress_A, master->dev->dev_addr); 356 357 if (skb_put_padto(skb, ETH_ZLEN)) { 358 spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); 359 return; 360 } 361 362 spin_unlock_irqrestore(&master->hsr->seqnr_lock, irqflags); 363 364 hsr_forward_skb(skb, master); 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; 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 INIT_LIST_HEAD(&hsr->self_node_db); 491 spin_lock_init(&hsr->list_lock); 492 493 ether_addr_copy(hsr_dev->dev_addr, slave[0]->dev_addr); 494 495 /* initialize protocol specific functions */ 496 if (protocol_version == PRP_V1) { 497 /* For PRP, lan_id has most significant 3 bits holding 498 * the net_id of PRP_LAN_ID 499 */ 500 hsr->net_id = PRP_LAN_ID << 1; 501 hsr->proto_ops = &prp_ops; 502 } else { 503 hsr->proto_ops = &hsr_ops; 504 } 505 506 /* Make sure we recognize frames from ourselves in hsr_rcv() */ 507 res = hsr_create_self_node(hsr, hsr_dev->dev_addr, 508 slave[1]->dev_addr); 509 if (res < 0) 510 return res; 511 512 spin_lock_init(&hsr->seqnr_lock); 513 /* Overflow soon to find bugs easier: */ 514 hsr->sequence_nr = HSR_SEQNR_START; 515 hsr->sup_sequence_nr = HSR_SUP_SEQNR_START; 516 517 timer_setup(&hsr->announce_timer, hsr_announce, 0); 518 timer_setup(&hsr->prune_timer, hsr_prune_nodes, 0); 519 520 ether_addr_copy(hsr->sup_multicast_addr, def_multicast_addr); 521 hsr->sup_multicast_addr[ETH_ALEN - 1] = multicast_spec; 522 523 hsr->prot_version = protocol_version; 524 525 /* Make sure the 1st call to netif_carrier_on() gets through */ 526 netif_carrier_off(hsr_dev); 527 528 res = hsr_add_port(hsr, hsr_dev, HSR_PT_MASTER, extack); 529 if (res) 530 goto err_add_master; 531 532 res = register_netdevice(hsr_dev); 533 if (res) 534 goto err_unregister; 535 536 unregister = true; 537 538 res = hsr_add_port(hsr, slave[0], HSR_PT_SLAVE_A, extack); 539 if (res) 540 goto err_unregister; 541 542 res = hsr_add_port(hsr, slave[1], HSR_PT_SLAVE_B, extack); 543 if (res) 544 goto err_unregister; 545 546 hsr_debugfs_init(hsr, hsr_dev); 547 mod_timer(&hsr->prune_timer, jiffies + msecs_to_jiffies(PRUNE_PERIOD)); 548 549 return 0; 550 551 err_unregister: 552 hsr_del_ports(hsr); 553 err_add_master: 554 hsr_del_self_node(hsr); 555 556 if (unregister) 557 unregister_netdevice(hsr_dev); 558 return res; 559 } 560