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