1// SPDX-License-Identifier: GPL-2.0 2/* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors: 3 * 4 * Marek Lindner, Simon Wunderlich 5 */ 6 7#include "soft-interface.h" 8#include "main.h" 9 10#include <linux/atomic.h> 11#include <linux/byteorder/generic.h> 12#include <linux/cache.h> 13#include <linux/compiler.h> 14#include <linux/cpumask.h> 15#include <linux/errno.h> 16#include <linux/etherdevice.h> 17#include <linux/ethtool.h> 18#include <linux/gfp.h> 19#include <linux/if_ether.h> 20#include <linux/if_vlan.h> 21#include <linux/jiffies.h> 22#include <linux/kernel.h> 23#include <linux/kref.h> 24#include <linux/list.h> 25#include <linux/lockdep.h> 26#include <linux/netdevice.h> 27#include <linux/netlink.h> 28#include <linux/percpu.h> 29#include <linux/printk.h> 30#include <linux/random.h> 31#include <linux/rculist.h> 32#include <linux/rcupdate.h> 33#include <linux/rtnetlink.h> 34#include <linux/skbuff.h> 35#include <linux/slab.h> 36#include <linux/socket.h> 37#include <linux/spinlock.h> 38#include <linux/stddef.h> 39#include <linux/string.h> 40#include <linux/types.h> 41#include <uapi/linux/batadv_packet.h> 42#include <uapi/linux/batman_adv.h> 43 44#include "bat_algo.h" 45#include "bridge_loop_avoidance.h" 46#include "debugfs.h" 47#include "distributed-arp-table.h" 48#include "gateway_client.h" 49#include "hard-interface.h" 50#include "multicast.h" 51#include "network-coding.h" 52#include "originator.h" 53#include "send.h" 54#include "sysfs.h" 55#include "translation-table.h" 56 57/** 58 * batadv_skb_head_push() - Increase header size and move (push) head pointer 59 * @skb: packet buffer which should be modified 60 * @len: number of bytes to add 61 * 62 * Return: 0 on success or negative error number in case of failure 63 */ 64int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) 65{ 66 int result; 67 68 /* TODO: We must check if we can release all references to non-payload 69 * data using __skb_header_release in our skbs to allow skb_cow_header 70 * to work optimally. This means that those skbs are not allowed to read 71 * or write any data which is before the current position of skb->data 72 * after that call and thus allow other skbs with the same data buffer 73 * to write freely in that area. 74 */ 75 result = skb_cow_head(skb, len); 76 if (result < 0) 77 return result; 78 79 skb_push(skb, len); 80 return 0; 81} 82 83static int batadv_interface_open(struct net_device *dev) 84{ 85 netif_start_queue(dev); 86 return 0; 87} 88 89static int batadv_interface_release(struct net_device *dev) 90{ 91 netif_stop_queue(dev); 92 return 0; 93} 94 95/** 96 * batadv_sum_counter() - Sum the cpu-local counters for index 'idx' 97 * @bat_priv: the bat priv with all the soft interface information 98 * @idx: index of counter to sum up 99 * 100 * Return: sum of all cpu-local counters 101 */ 102static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx) 103{ 104 u64 *counters, sum = 0; 105 int cpu; 106 107 for_each_possible_cpu(cpu) { 108 counters = per_cpu_ptr(bat_priv->bat_counters, cpu); 109 sum += counters[idx]; 110 } 111 112 return sum; 113} 114 115static struct net_device_stats *batadv_interface_stats(struct net_device *dev) 116{ 117 struct batadv_priv *bat_priv = netdev_priv(dev); 118 struct net_device_stats *stats = &dev->stats; 119 120 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); 121 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); 122 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); 123 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); 124 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); 125 return stats; 126} 127 128static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) 129{ 130 struct batadv_priv *bat_priv = netdev_priv(dev); 131 struct batadv_softif_vlan *vlan; 132 struct sockaddr *addr = p; 133 u8 old_addr[ETH_ALEN]; 134 135 if (!is_valid_ether_addr(addr->sa_data)) 136 return -EADDRNOTAVAIL; 137 138 ether_addr_copy(old_addr, dev->dev_addr); 139 ether_addr_copy(dev->dev_addr, addr->sa_data); 140 141 /* only modify transtable if it has been initialized before */ 142 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 143 return 0; 144 145 rcu_read_lock(); 146 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 147 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, 148 "mac address changed", false); 149 batadv_tt_local_add(dev, addr->sa_data, vlan->vid, 150 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 151 } 152 rcu_read_unlock(); 153 154 return 0; 155} 156 157static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 158{ 159 struct batadv_priv *bat_priv = netdev_priv(dev); 160 161 /* check ranges */ 162 if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev)) 163 return -EINVAL; 164 165 dev->mtu = new_mtu; 166 bat_priv->mtu_set_by_user = new_mtu; 167 168 return 0; 169} 170 171/** 172 * batadv_interface_set_rx_mode() - set the rx mode of a device 173 * @dev: registered network device to modify 174 * 175 * We do not actually need to set any rx filters for the virtual batman 176 * soft interface. However a dummy handler enables a user to set static 177 * multicast listeners for instance. 178 */ 179static void batadv_interface_set_rx_mode(struct net_device *dev) 180{ 181} 182 183static netdev_tx_t batadv_interface_tx(struct sk_buff *skb, 184 struct net_device *soft_iface) 185{ 186 struct ethhdr *ethhdr; 187 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 188 struct batadv_hard_iface *primary_if = NULL; 189 struct batadv_bcast_packet *bcast_packet; 190 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 191 0x00, 0x00}; 192 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 193 0x00, 0x00}; 194 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 195 u8 *dst_hint = NULL, chaddr[ETH_ALEN]; 196 struct vlan_ethhdr *vhdr; 197 unsigned int header_len = 0; 198 int data_len = skb->len, ret; 199 unsigned long brd_delay = 1; 200 bool do_bcast = false, client_added; 201 unsigned short vid; 202 u32 seqno; 203 int gw_mode; 204 enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE; 205 struct batadv_orig_node *mcast_single_orig = NULL; 206 int mcast_is_routable = 0; 207 int network_offset = ETH_HLEN; 208 __be16 proto; 209 210 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 211 goto dropped; 212 213 /* reset control block to avoid left overs from previous users */ 214 memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); 215 216 netif_trans_update(soft_iface); 217 vid = batadv_get_vid(skb, 0); 218 219 skb_reset_mac_header(skb); 220 ethhdr = eth_hdr(skb); 221 222 proto = ethhdr->h_proto; 223 224 switch (ntohs(proto)) { 225 case ETH_P_8021Q: 226 if (!pskb_may_pull(skb, sizeof(*vhdr))) 227 goto dropped; 228 vhdr = vlan_eth_hdr(skb); 229 proto = vhdr->h_vlan_encapsulated_proto; 230 231 /* drop batman-in-batman packets to prevent loops */ 232 if (proto != htons(ETH_P_BATMAN)) { 233 network_offset += VLAN_HLEN; 234 break; 235 } 236 237 fallthrough; 238 case ETH_P_BATMAN: 239 goto dropped; 240 } 241 242 skb_set_network_header(skb, network_offset); 243 244 if (batadv_bla_tx(bat_priv, skb, vid)) 245 goto dropped; 246 247 /* skb->data might have been reallocated by batadv_bla_tx() */ 248 ethhdr = eth_hdr(skb); 249 250 /* Register the client MAC in the transtable */ 251 if (!is_multicast_ether_addr(ethhdr->h_source) && 252 !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) { 253 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 254 vid, skb->skb_iif, 255 skb->mark); 256 if (!client_added) 257 goto dropped; 258 } 259 260 /* Snoop address candidates from DHCPACKs for early DAT filling */ 261 batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid); 262 263 /* don't accept stp packets. STP does not help in meshes. 264 * better use the bridge loop avoidance ... 265 * 266 * The same goes for ECTP sent at least by some Cisco Switches, 267 * it might confuse the mesh when used with bridge loop avoidance. 268 */ 269 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 270 goto dropped; 271 272 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 273 goto dropped; 274 275 gw_mode = atomic_read(&bat_priv->gw.mode); 276 if (is_multicast_ether_addr(ethhdr->h_dest)) { 277 /* if gw mode is off, broadcast every packet */ 278 if (gw_mode == BATADV_GW_MODE_OFF) { 279 do_bcast = true; 280 goto send; 281 } 282 283 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 284 chaddr); 285 /* skb->data may have been modified by 286 * batadv_gw_dhcp_recipient_get() 287 */ 288 ethhdr = eth_hdr(skb); 289 /* if gw_mode is on, broadcast any non-DHCP message. 290 * All the DHCP packets are going to be sent as unicast 291 */ 292 if (dhcp_rcp == BATADV_DHCP_NO) { 293 do_bcast = true; 294 goto send; 295 } 296 297 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 298 dst_hint = chaddr; 299 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 300 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 301 /* gateways should not forward any DHCP message if 302 * directed to a DHCP server 303 */ 304 goto dropped; 305 306send: 307 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 308 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 309 &mcast_single_orig, 310 &mcast_is_routable); 311 if (forw_mode == BATADV_FORW_NONE) 312 goto dropped; 313 314 if (forw_mode == BATADV_FORW_SINGLE || 315 forw_mode == BATADV_FORW_SOME) 316 do_bcast = false; 317 } 318 } 319 320 batadv_skb_set_priority(skb, 0); 321 322 /* ethernet packet should be broadcasted */ 323 if (do_bcast) { 324 primary_if = batadv_primary_if_get_selected(bat_priv); 325 if (!primary_if) 326 goto dropped; 327 328 /* in case of ARP request, we do not immediately broadcasti the 329 * packet, instead we first wait for DAT to try to retrieve the 330 * correct ARP entry 331 */ 332 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 333 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 334 335 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 336 goto dropped; 337 338 bcast_packet = (struct batadv_bcast_packet *)skb->data; 339 bcast_packet->version = BATADV_COMPAT_VERSION; 340 bcast_packet->ttl = BATADV_TTL; 341 342 /* batman packet type: broadcast */ 343 bcast_packet->packet_type = BATADV_BCAST; 344 bcast_packet->reserved = 0; 345 346 /* hw address of first interface is the orig mac because only 347 * this mac is known throughout the mesh 348 */ 349 ether_addr_copy(bcast_packet->orig, 350 primary_if->net_dev->dev_addr); 351 352 /* set broadcast sequence number */ 353 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 354 bcast_packet->seqno = htonl(seqno); 355 356 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true); 357 358 /* a copy is stored in the bcast list, therefore removing 359 * the original skb. 360 */ 361 consume_skb(skb); 362 363 /* unicast packet */ 364 } else { 365 /* DHCP packets going to a server will use the GW feature */ 366 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 367 ret = batadv_gw_out_of_range(bat_priv, skb); 368 if (ret) 369 goto dropped; 370 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 371 } else if (mcast_single_orig) { 372 ret = batadv_mcast_forw_send_orig(bat_priv, skb, vid, 373 mcast_single_orig); 374 } else if (forw_mode == BATADV_FORW_SOME) { 375 ret = batadv_mcast_forw_send(bat_priv, skb, vid, 376 mcast_is_routable); 377 } else { 378 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 379 skb)) 380 goto dropped; 381 382 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 383 384 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 385 vid); 386 } 387 if (ret != NET_XMIT_SUCCESS) 388 goto dropped_freed; 389 } 390 391 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 392 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 393 goto end; 394 395dropped: 396 kfree_skb(skb); 397dropped_freed: 398 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 399end: 400 if (mcast_single_orig) 401 batadv_orig_node_put(mcast_single_orig); 402 if (primary_if) 403 batadv_hardif_put(primary_if); 404 return NETDEV_TX_OK; 405} 406 407/** 408 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface 409 * @soft_iface: local interface which will receive the ethernet frame 410 * @skb: ethernet frame for @soft_iface 411 * @hdr_size: size of already parsed batman-adv header 412 * @orig_node: originator from which the batman-adv packet was sent 413 * 414 * Sends an ethernet frame to the receive path of the local @soft_iface. 415 * skb->data has still point to the batman-adv header with the size @hdr_size. 416 * The caller has to have parsed this header already and made sure that at least 417 * @hdr_size bytes are still available for pull in @skb. 418 * 419 * The packet may still get dropped. This can happen when the encapsulated 420 * ethernet frame is invalid or contains again an batman-adv packet. Also 421 * unicast packets will be dropped directly when it was sent between two 422 * isolated clients. 423 */ 424void batadv_interface_rx(struct net_device *soft_iface, 425 struct sk_buff *skb, int hdr_size, 426 struct batadv_orig_node *orig_node) 427{ 428 struct batadv_bcast_packet *batadv_bcast_packet; 429 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 430 struct vlan_ethhdr *vhdr; 431 struct ethhdr *ethhdr; 432 unsigned short vid; 433 int packet_type; 434 435 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 436 packet_type = batadv_bcast_packet->packet_type; 437 438 skb_pull_rcsum(skb, hdr_size); 439 skb_reset_mac_header(skb); 440 441 /* clean the netfilter state now that the batman-adv header has been 442 * removed 443 */ 444 nf_reset_ct(skb); 445 446 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 447 goto dropped; 448 449 vid = batadv_get_vid(skb, 0); 450 ethhdr = eth_hdr(skb); 451 452 switch (ntohs(ethhdr->h_proto)) { 453 case ETH_P_8021Q: 454 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 455 goto dropped; 456 457 vhdr = skb_vlan_eth_hdr(skb); 458 459 /* drop batman-in-batman packets to prevent loops */ 460 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) 461 break; 462 463 fallthrough; 464 case ETH_P_BATMAN: 465 goto dropped; 466 } 467 468 /* skb->dev & skb->pkt_type are set here */ 469 skb->protocol = eth_type_trans(skb, soft_iface); 470 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 471 472 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 473 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 474 skb->len + ETH_HLEN); 475 476 /* Let the bridge loop avoidance check the packet. If will 477 * not handle it, we can safely push it up. 478 */ 479 if (batadv_bla_rx(bat_priv, skb, vid, packet_type)) 480 goto out; 481 482 if (orig_node) 483 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 484 ethhdr->h_source, vid); 485 486 if (is_multicast_ether_addr(ethhdr->h_dest)) { 487 /* set the mark on broadcast packets if AP isolation is ON and 488 * the packet is coming from an "isolated" client 489 */ 490 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 491 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 492 vid)) { 493 /* save bits in skb->mark not covered by the mask and 494 * apply the mark on the rest 495 */ 496 skb->mark &= ~bat_priv->isolation_mark_mask; 497 skb->mark |= bat_priv->isolation_mark; 498 } 499 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 500 ethhdr->h_dest, vid)) { 501 goto dropped; 502 } 503 504 netif_rx(skb); 505 goto out; 506 507dropped: 508 kfree_skb(skb); 509out: 510 return; 511} 512 513/** 514 * batadv_softif_vlan_release() - release vlan from lists and queue for free 515 * after rcu grace period 516 * @ref: kref pointer of the vlan object 517 */ 518void batadv_softif_vlan_release(struct kref *ref) 519{ 520 struct batadv_softif_vlan *vlan; 521 522 vlan = container_of(ref, struct batadv_softif_vlan, refcount); 523 524 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 525 hlist_del_rcu(&vlan->list); 526 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 527 528 kfree_rcu(vlan, rcu); 529} 530 531/** 532 * batadv_softif_vlan_get() - get the vlan object for a specific vid 533 * @bat_priv: the bat priv with all the soft interface information 534 * @vid: the identifier of the vlan object to retrieve 535 * 536 * Return: the private data of the vlan matching the vid passed as argument or 537 * NULL otherwise. The refcounter of the returned object is incremented by 1. 538 */ 539struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 540 unsigned short vid) 541{ 542 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 543 544 rcu_read_lock(); 545 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 546 if (vlan_tmp->vid != vid) 547 continue; 548 549 if (!kref_get_unless_zero(&vlan_tmp->refcount)) 550 continue; 551 552 vlan = vlan_tmp; 553 break; 554 } 555 rcu_read_unlock(); 556 557 return vlan; 558} 559 560/** 561 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan 562 * @bat_priv: the bat priv with all the soft interface information 563 * @vid: the VLAN identifier 564 * 565 * Return: 0 on success, a negative error otherwise. 566 */ 567int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 568{ 569 struct batadv_softif_vlan *vlan; 570 int err; 571 572 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 573 574 vlan = batadv_softif_vlan_get(bat_priv, vid); 575 if (vlan) { 576 batadv_softif_vlan_put(vlan); 577 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 578 return -EEXIST; 579 } 580 581 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 582 if (!vlan) { 583 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 584 return -ENOMEM; 585 } 586 587 vlan->bat_priv = bat_priv; 588 vlan->vid = vid; 589 kref_init(&vlan->refcount); 590 591 atomic_set(&vlan->ap_isolation, 0); 592 593 kref_get(&vlan->refcount); 594 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 595 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 596 597 /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the 598 * sleeping behavior of the sysfs functions and the fs_reclaim lock 599 */ 600 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 601 if (err) { 602 /* ref for the function */ 603 batadv_softif_vlan_put(vlan); 604 605 /* ref for the list */ 606 batadv_softif_vlan_put(vlan); 607 return err; 608 } 609 610 /* add a new TT local entry. This one will be marked with the NOPURGE 611 * flag 612 */ 613 batadv_tt_local_add(bat_priv->soft_iface, 614 bat_priv->soft_iface->dev_addr, vid, 615 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 616 617 /* don't return reference to new softif_vlan */ 618 batadv_softif_vlan_put(vlan); 619 620 return 0; 621} 622 623/** 624 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object 625 * @bat_priv: the bat priv with all the soft interface information 626 * @vlan: the object to remove 627 */ 628static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 629 struct batadv_softif_vlan *vlan) 630{ 631 /* explicitly remove the associated TT local entry because it is marked 632 * with the NOPURGE flag 633 */ 634 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 635 vlan->vid, "vlan interface destroyed", false); 636 637 batadv_sysfs_del_vlan(bat_priv, vlan); 638 batadv_softif_vlan_put(vlan); 639} 640 641/** 642 * batadv_interface_add_vid() - ndo_add_vid API implementation 643 * @dev: the netdev of the mesh interface 644 * @proto: protocol of the vlan id 645 * @vid: identifier of the new vlan 646 * 647 * Set up all the internal structures for handling the new vlan on top of the 648 * mesh interface 649 * 650 * Return: 0 on success or a negative error code in case of failure. 651 */ 652static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 653 unsigned short vid) 654{ 655 struct batadv_priv *bat_priv = netdev_priv(dev); 656 struct batadv_softif_vlan *vlan; 657 int ret; 658 659 /* only 802.1Q vlans are supported. 660 * batman-adv does not know how to handle other types 661 */ 662 if (proto != htons(ETH_P_8021Q)) 663 return -EINVAL; 664 665 vid |= BATADV_VLAN_HAS_TAG; 666 667 /* if a new vlan is getting created and it already exists, it means that 668 * it was not deleted yet. batadv_softif_vlan_get() increases the 669 * refcount in order to revive the object. 670 * 671 * if it does not exist then create it. 672 */ 673 vlan = batadv_softif_vlan_get(bat_priv, vid); 674 if (!vlan) 675 return batadv_softif_create_vlan(bat_priv, vid); 676 677 /* recreate the sysfs object if it was already destroyed (and it should 678 * be since we received a kill_vid() for this vlan 679 */ 680 if (!vlan->kobj) { 681 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 682 if (ret) { 683 batadv_softif_vlan_put(vlan); 684 return ret; 685 } 686 } 687 688 /* add a new TT local entry. This one will be marked with the NOPURGE 689 * flag. This must be added again, even if the vlan object already 690 * exists, because the entry was deleted by kill_vid() 691 */ 692 batadv_tt_local_add(bat_priv->soft_iface, 693 bat_priv->soft_iface->dev_addr, vid, 694 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 695 696 return 0; 697} 698 699/** 700 * batadv_interface_kill_vid() - ndo_kill_vid API implementation 701 * @dev: the netdev of the mesh interface 702 * @proto: protocol of the vlan id 703 * @vid: identifier of the deleted vlan 704 * 705 * Destroy all the internal structures used to handle the vlan identified by vid 706 * on top of the mesh interface 707 * 708 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 709 * or -ENOENT if the specified vlan id wasn't registered. 710 */ 711static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 712 unsigned short vid) 713{ 714 struct batadv_priv *bat_priv = netdev_priv(dev); 715 struct batadv_softif_vlan *vlan; 716 717 /* only 802.1Q vlans are supported. batman-adv does not know how to 718 * handle other types 719 */ 720 if (proto != htons(ETH_P_8021Q)) 721 return -EINVAL; 722 723 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 724 if (!vlan) 725 return -ENOENT; 726 727 batadv_softif_destroy_vlan(bat_priv, vlan); 728 729 /* finally free the vlan object */ 730 batadv_softif_vlan_put(vlan); 731 732 return 0; 733} 734 735/* batman-adv network devices have devices nesting below it and are a special 736 * "super class" of normal network devices; split their locks off into a 737 * separate class since they always nest. 738 */ 739static struct lock_class_key batadv_netdev_xmit_lock_key; 740static struct lock_class_key batadv_netdev_addr_lock_key; 741 742/** 743 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue 744 * @dev: device which owns the tx queue 745 * @txq: tx queue to modify 746 * @_unused: always NULL 747 */ 748static void batadv_set_lockdep_class_one(struct net_device *dev, 749 struct netdev_queue *txq, 750 void *_unused) 751{ 752 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 753} 754 755/** 756 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class 757 * @dev: network device to modify 758 */ 759static void batadv_set_lockdep_class(struct net_device *dev) 760{ 761 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 762 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 763} 764 765/** 766 * batadv_softif_init_late() - late stage initialization of soft interface 767 * @dev: registered network device to modify 768 * 769 * Return: error code on failures 770 */ 771static int batadv_softif_init_late(struct net_device *dev) 772{ 773 struct batadv_priv *bat_priv; 774 u32 random_seqno; 775 int ret; 776 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 777 778 batadv_set_lockdep_class(dev); 779 780 bat_priv = netdev_priv(dev); 781 bat_priv->soft_iface = dev; 782 783 /* batadv_interface_stats() needs to be available as soon as 784 * register_netdevice() has been called 785 */ 786 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 787 if (!bat_priv->bat_counters) 788 return -ENOMEM; 789 790 atomic_set(&bat_priv->aggregated_ogms, 1); 791 atomic_set(&bat_priv->bonding, 0); 792#ifdef CONFIG_BATMAN_ADV_BLA 793 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 794#endif 795#ifdef CONFIG_BATMAN_ADV_DAT 796 atomic_set(&bat_priv->distributed_arp_table, 1); 797#endif 798#ifdef CONFIG_BATMAN_ADV_MCAST 799 atomic_set(&bat_priv->multicast_mode, 1); 800 atomic_set(&bat_priv->multicast_fanout, 16); 801 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 802 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 803 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 804#endif 805 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); 806 atomic_set(&bat_priv->gw.bandwidth_down, 100); 807 atomic_set(&bat_priv->gw.bandwidth_up, 20); 808 atomic_set(&bat_priv->orig_interval, 1000); 809 atomic_set(&bat_priv->hop_penalty, 30); 810#ifdef CONFIG_BATMAN_ADV_DEBUG 811 atomic_set(&bat_priv->log_level, 0); 812#endif 813 atomic_set(&bat_priv->fragmentation, 1); 814 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 815 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 816 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 817 818 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 819 atomic_set(&bat_priv->bcast_seqno, 1); 820 atomic_set(&bat_priv->tt.vn, 0); 821 atomic_set(&bat_priv->tt.local_changes, 0); 822 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 823#ifdef CONFIG_BATMAN_ADV_BLA 824 atomic_set(&bat_priv->bla.num_requests, 0); 825#endif 826 atomic_set(&bat_priv->tp_num, 0); 827 828 bat_priv->tt.last_changeset = NULL; 829 bat_priv->tt.last_changeset_len = 0; 830 bat_priv->isolation_mark = 0; 831 bat_priv->isolation_mark_mask = 0; 832 833 /* randomize initial seqno to avoid collision */ 834 get_random_bytes(&random_seqno, sizeof(random_seqno)); 835 atomic_set(&bat_priv->frag_seqno, random_seqno); 836 837 bat_priv->primary_if = NULL; 838 839 batadv_nc_init_bat_priv(bat_priv); 840 841 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 842 if (ret < 0) 843 goto free_bat_counters; 844 845 ret = batadv_debugfs_add_meshif(dev); 846 if (ret < 0) 847 goto free_bat_counters; 848 849 ret = batadv_mesh_init(dev); 850 if (ret < 0) 851 goto unreg_debugfs; 852 853 return 0; 854 855unreg_debugfs: 856 batadv_debugfs_del_meshif(dev); 857free_bat_counters: 858 free_percpu(bat_priv->bat_counters); 859 bat_priv->bat_counters = NULL; 860 861 return ret; 862} 863 864/** 865 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface 866 * @dev: batadv_soft_interface used as master interface 867 * @slave_dev: net_device which should become the slave interface 868 * @extack: extended ACK report struct 869 * 870 * Return: 0 if successful or error otherwise. 871 */ 872static int batadv_softif_slave_add(struct net_device *dev, 873 struct net_device *slave_dev, 874 struct netlink_ext_ack *extack) 875{ 876 struct batadv_hard_iface *hard_iface; 877 struct net *net = dev_net(dev); 878 int ret = -EINVAL; 879 880 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 881 if (!hard_iface || hard_iface->soft_iface) 882 goto out; 883 884 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name); 885 886out: 887 if (hard_iface) 888 batadv_hardif_put(hard_iface); 889 return ret; 890} 891 892/** 893 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface 894 * @dev: batadv_soft_interface used as master interface 895 * @slave_dev: net_device which should be removed from the master interface 896 * 897 * Return: 0 if successful or error otherwise. 898 */ 899static int batadv_softif_slave_del(struct net_device *dev, 900 struct net_device *slave_dev) 901{ 902 struct batadv_hard_iface *hard_iface; 903 int ret = -EINVAL; 904 905 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 906 907 if (!hard_iface || hard_iface->soft_iface != dev) 908 goto out; 909 910 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 911 ret = 0; 912 913out: 914 if (hard_iface) 915 batadv_hardif_put(hard_iface); 916 return ret; 917} 918 919static const struct net_device_ops batadv_netdev_ops = { 920 .ndo_init = batadv_softif_init_late, 921 .ndo_open = batadv_interface_open, 922 .ndo_stop = batadv_interface_release, 923 .ndo_get_stats = batadv_interface_stats, 924 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 925 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 926 .ndo_set_mac_address = batadv_interface_set_mac_addr, 927 .ndo_change_mtu = batadv_interface_change_mtu, 928 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 929 .ndo_start_xmit = batadv_interface_tx, 930 .ndo_validate_addr = eth_validate_addr, 931 .ndo_add_slave = batadv_softif_slave_add, 932 .ndo_del_slave = batadv_softif_slave_del, 933}; 934 935static void batadv_get_drvinfo(struct net_device *dev, 936 struct ethtool_drvinfo *info) 937{ 938 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 939 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 940 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 941 strscpy(info->bus_info, "batman", sizeof(info->bus_info)); 942} 943 944/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 945 * Declare each description string in struct.name[] to get fixed sized buffer 946 * and compile time checking for strings longer than ETH_GSTRING_LEN. 947 */ 948static const struct { 949 const char name[ETH_GSTRING_LEN]; 950} batadv_counters_strings[] = { 951 { "tx" }, 952 { "tx_bytes" }, 953 { "tx_dropped" }, 954 { "rx" }, 955 { "rx_bytes" }, 956 { "forward" }, 957 { "forward_bytes" }, 958 { "mgmt_tx" }, 959 { "mgmt_tx_bytes" }, 960 { "mgmt_rx" }, 961 { "mgmt_rx_bytes" }, 962 { "frag_tx" }, 963 { "frag_tx_bytes" }, 964 { "frag_rx" }, 965 { "frag_rx_bytes" }, 966 { "frag_fwd" }, 967 { "frag_fwd_bytes" }, 968 { "tt_request_tx" }, 969 { "tt_request_rx" }, 970 { "tt_response_tx" }, 971 { "tt_response_rx" }, 972 { "tt_roam_adv_tx" }, 973 { "tt_roam_adv_rx" }, 974#ifdef CONFIG_BATMAN_ADV_DAT 975 { "dat_get_tx" }, 976 { "dat_get_rx" }, 977 { "dat_put_tx" }, 978 { "dat_put_rx" }, 979 { "dat_cached_reply_tx" }, 980#endif 981#ifdef CONFIG_BATMAN_ADV_NC 982 { "nc_code" }, 983 { "nc_code_bytes" }, 984 { "nc_recode" }, 985 { "nc_recode_bytes" }, 986 { "nc_buffer" }, 987 { "nc_decode" }, 988 { "nc_decode_bytes" }, 989 { "nc_decode_failed" }, 990 { "nc_sniffed" }, 991#endif 992}; 993 994static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 995{ 996 if (stringset == ETH_SS_STATS) 997 memcpy(data, batadv_counters_strings, 998 sizeof(batadv_counters_strings)); 999} 1000 1001static void batadv_get_ethtool_stats(struct net_device *dev, 1002 struct ethtool_stats *stats, u64 *data) 1003{ 1004 struct batadv_priv *bat_priv = netdev_priv(dev); 1005 int i; 1006 1007 for (i = 0; i < BATADV_CNT_NUM; i++) 1008 data[i] = batadv_sum_counter(bat_priv, i); 1009} 1010 1011static int batadv_get_sset_count(struct net_device *dev, int stringset) 1012{ 1013 if (stringset == ETH_SS_STATS) 1014 return BATADV_CNT_NUM; 1015 1016 return -EOPNOTSUPP; 1017} 1018 1019static const struct ethtool_ops batadv_ethtool_ops = { 1020 .get_drvinfo = batadv_get_drvinfo, 1021 .get_link = ethtool_op_get_link, 1022 .get_strings = batadv_get_strings, 1023 .get_ethtool_stats = batadv_get_ethtool_stats, 1024 .get_sset_count = batadv_get_sset_count, 1025}; 1026 1027/** 1028 * batadv_softif_free() - Deconstructor of batadv_soft_interface 1029 * @dev: Device to cleanup and remove 1030 */ 1031static void batadv_softif_free(struct net_device *dev) 1032{ 1033 batadv_debugfs_del_meshif(dev); 1034 batadv_mesh_free(dev); 1035 1036 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 1037 * their tasks. Wait for them all to be finished before freeing the 1038 * netdev and its private data (bat_priv) 1039 */ 1040 rcu_barrier(); 1041} 1042 1043/** 1044 * batadv_softif_init_early() - early stage initialization of soft interface 1045 * @dev: registered network device to modify 1046 */ 1047static void batadv_softif_init_early(struct net_device *dev) 1048{ 1049 ether_setup(dev); 1050 1051 dev->netdev_ops = &batadv_netdev_ops; 1052 dev->needs_free_netdev = true; 1053 dev->priv_destructor = batadv_softif_free; 1054 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; 1055 dev->features |= NETIF_F_LLTX; 1056 dev->priv_flags |= IFF_NO_QUEUE; 1057 1058 /* can't call min_mtu, because the needed variables 1059 * have not been initialized yet 1060 */ 1061 dev->mtu = ETH_DATA_LEN; 1062 1063 /* generate random address */ 1064 eth_hw_addr_random(dev); 1065 1066 dev->ethtool_ops = &batadv_ethtool_ops; 1067} 1068 1069/** 1070 * batadv_softif_create() - Create and register soft interface 1071 * @net: the applicable net namespace 1072 * @name: name of the new soft interface 1073 * 1074 * Return: newly allocated soft_interface, NULL on errors 1075 */ 1076struct net_device *batadv_softif_create(struct net *net, const char *name) 1077{ 1078 struct net_device *soft_iface; 1079 int ret; 1080 1081 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 1082 NET_NAME_UNKNOWN, batadv_softif_init_early); 1083 if (!soft_iface) 1084 return NULL; 1085 1086 dev_net_set(soft_iface, net); 1087 1088 soft_iface->rtnl_link_ops = &batadv_link_ops; 1089 1090 ret = register_netdevice(soft_iface); 1091 if (ret < 0) { 1092 pr_err("Unable to register the batman interface '%s': %i\n", 1093 name, ret); 1094 free_netdev(soft_iface); 1095 return NULL; 1096 } 1097 1098 return soft_iface; 1099} 1100 1101/** 1102 * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs 1103 * @soft_iface: the to-be-removed batman-adv interface 1104 */ 1105void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 1106{ 1107 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1108 struct batadv_softif_vlan *vlan; 1109 1110 ASSERT_RTNL(); 1111 1112 /* destroy the "untagged" VLAN */ 1113 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1114 if (vlan) { 1115 batadv_softif_destroy_vlan(bat_priv, vlan); 1116 batadv_softif_vlan_put(vlan); 1117 } 1118 1119 batadv_sysfs_del_meshif(soft_iface); 1120 unregister_netdevice(soft_iface); 1121} 1122 1123/** 1124 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via 1125 * netlink 1126 * @soft_iface: the to-be-removed batman-adv interface 1127 * @head: list pointer 1128 */ 1129static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1130 struct list_head *head) 1131{ 1132 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1133 struct batadv_hard_iface *hard_iface; 1134 struct batadv_softif_vlan *vlan; 1135 1136 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1137 if (hard_iface->soft_iface == soft_iface) 1138 batadv_hardif_disable_interface(hard_iface, 1139 BATADV_IF_CLEANUP_KEEP); 1140 } 1141 1142 /* destroy the "untagged" VLAN */ 1143 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1144 if (vlan) { 1145 batadv_softif_destroy_vlan(bat_priv, vlan); 1146 batadv_softif_vlan_put(vlan); 1147 } 1148 1149 batadv_sysfs_del_meshif(soft_iface); 1150 unregister_netdevice_queue(soft_iface, head); 1151} 1152 1153/** 1154 * batadv_softif_is_valid() - Check whether device is a batadv soft interface 1155 * @net_dev: device which should be checked 1156 * 1157 * Return: true when net_dev is a batman-adv interface, false otherwise 1158 */ 1159bool batadv_softif_is_valid(const struct net_device *net_dev) 1160{ 1161 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1162 return true; 1163 1164 return false; 1165} 1166 1167struct rtnl_link_ops batadv_link_ops __read_mostly = { 1168 .kind = "batadv", 1169 .priv_size = sizeof(struct batadv_priv), 1170 .setup = batadv_softif_init_early, 1171 .dellink = batadv_softif_destroy_netlink, 1172}; 1173