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 */ 61 int 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 80 static int batadv_interface_open(struct net_device *dev) 81 { 82 netif_start_queue(dev); 83 return 0; 84 } 85 86 static 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 */ 99 static 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 } 111 112 static 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 } 124 125 static 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 } 153 154 static 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 WRITE_ONCE(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 */ 176 static void batadv_interface_set_rx_mode(struct net_device *dev) 177 { 178 } 179 180 static 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; 301 302 send: 303 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 304 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, vid, 305 &mcast_is_routable); 306 switch (forw_mode) { 307 case BATADV_FORW_BCAST: 308 break; 309 case BATADV_FORW_UCASTS: 310 case BATADV_FORW_MCAST: 311 do_bcast = false; 312 break; 313 case BATADV_FORW_NONE: 314 fallthrough; 315 default: 316 goto dropped; 317 } 318 } 319 } 320 321 batadv_skb_set_priority(skb, 0); 322 323 /* ethernet packet should be broadcasted */ 324 if (do_bcast) { 325 primary_if = batadv_primary_if_get_selected(bat_priv); 326 if (!primary_if) 327 goto dropped; 328 329 /* in case of ARP request, we do not immediately broadcasti the 330 * packet, instead we first wait for DAT to try to retrieve the 331 * correct ARP entry 332 */ 333 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 334 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 335 336 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 337 goto dropped; 338 339 bcast_packet = (struct batadv_bcast_packet *)skb->data; 340 bcast_packet->version = BATADV_COMPAT_VERSION; 341 bcast_packet->ttl = BATADV_TTL - 1; 342 343 /* batman packet type: broadcast */ 344 bcast_packet->packet_type = BATADV_BCAST; 345 bcast_packet->reserved = 0; 346 347 /* hw address of first interface is the orig mac because only 348 * this mac is known throughout the mesh 349 */ 350 ether_addr_copy(bcast_packet->orig, 351 primary_if->net_dev->dev_addr); 352 353 /* set broadcast sequence number */ 354 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 355 bcast_packet->seqno = htonl(seqno); 356 357 batadv_send_bcast_packet(bat_priv, skb, brd_delay, true); 358 /* unicast packet */ 359 } else { 360 /* DHCP packets going to a server will use the GW feature */ 361 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 362 ret = batadv_gw_out_of_range(bat_priv, skb); 363 if (ret) 364 goto dropped; 365 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 366 } else if (forw_mode == BATADV_FORW_UCASTS) { 367 ret = batadv_mcast_forw_send(bat_priv, skb, vid, 368 mcast_is_routable); 369 } else if (forw_mode == BATADV_FORW_MCAST) { 370 ret = batadv_mcast_forw_mcsend(bat_priv, skb); 371 } else { 372 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 373 skb)) 374 goto dropped; 375 376 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 377 378 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 379 vid); 380 } 381 if (ret != NET_XMIT_SUCCESS) 382 goto dropped_freed; 383 } 384 385 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 386 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 387 goto end; 388 389 dropped: 390 kfree_skb(skb); 391 dropped_freed: 392 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 393 end: 394 batadv_hardif_put(primary_if); 395 return NETDEV_TX_OK; 396 } 397 398 /** 399 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface 400 * @soft_iface: local interface which will receive the ethernet frame 401 * @skb: ethernet frame for @soft_iface 402 * @hdr_size: size of already parsed batman-adv header 403 * @orig_node: originator from which the batman-adv packet was sent 404 * 405 * Sends an ethernet frame to the receive path of the local @soft_iface. 406 * skb->data has still point to the batman-adv header with the size @hdr_size. 407 * The caller has to have parsed this header already and made sure that at least 408 * @hdr_size bytes are still available for pull in @skb. 409 * 410 * The packet may still get dropped. This can happen when the encapsulated 411 * ethernet frame is invalid or contains again an batman-adv packet. Also 412 * unicast packets will be dropped directly when it was sent between two 413 * isolated clients. 414 */ 415 void batadv_interface_rx(struct net_device *soft_iface, 416 struct sk_buff *skb, int hdr_size, 417 struct batadv_orig_node *orig_node) 418 { 419 struct batadv_bcast_packet *batadv_bcast_packet; 420 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 421 struct vlan_ethhdr *vhdr; 422 struct ethhdr *ethhdr; 423 unsigned short vid; 424 int packet_type; 425 426 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 427 packet_type = batadv_bcast_packet->packet_type; 428 429 skb_pull_rcsum(skb, hdr_size); 430 skb_reset_mac_header(skb); 431 432 /* clean the netfilter state now that the batman-adv header has been 433 * removed 434 */ 435 nf_reset_ct(skb); 436 437 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 438 goto dropped; 439 440 vid = batadv_get_vid(skb, 0); 441 ethhdr = eth_hdr(skb); 442 443 switch (ntohs(ethhdr->h_proto)) { 444 case ETH_P_8021Q: 445 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 446 goto dropped; 447 448 vhdr = skb_vlan_eth_hdr(skb); 449 450 /* drop batman-in-batman packets to prevent loops */ 451 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) 452 break; 453 454 fallthrough; 455 case ETH_P_BATMAN: 456 goto dropped; 457 } 458 459 /* skb->dev & skb->pkt_type are set here */ 460 skb->protocol = eth_type_trans(skb, soft_iface); 461 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 462 463 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 464 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 465 skb->len + ETH_HLEN); 466 467 /* Let the bridge loop avoidance check the packet. If will 468 * not handle it, we can safely push it up. 469 */ 470 if (batadv_bla_rx(bat_priv, skb, vid, packet_type)) 471 goto out; 472 473 if (orig_node) 474 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 475 ethhdr->h_source, vid); 476 477 if (is_multicast_ether_addr(ethhdr->h_dest)) { 478 /* set the mark on broadcast packets if AP isolation is ON and 479 * the packet is coming from an "isolated" client 480 */ 481 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 482 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 483 vid)) { 484 /* save bits in skb->mark not covered by the mask and 485 * apply the mark on the rest 486 */ 487 skb->mark &= ~bat_priv->isolation_mark_mask; 488 skb->mark |= bat_priv->isolation_mark; 489 } 490 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 491 ethhdr->h_dest, vid)) { 492 goto dropped; 493 } 494 495 netif_rx(skb); 496 goto out; 497 498 dropped: 499 kfree_skb(skb); 500 out: 501 return; 502 } 503 504 /** 505 * batadv_softif_vlan_release() - release vlan from lists and queue for free 506 * after rcu grace period 507 * @ref: kref pointer of the vlan object 508 */ 509 void batadv_softif_vlan_release(struct kref *ref) 510 { 511 struct batadv_softif_vlan *vlan; 512 513 vlan = container_of(ref, struct batadv_softif_vlan, refcount); 514 515 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 516 hlist_del_rcu(&vlan->list); 517 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 518 519 kfree_rcu(vlan, rcu); 520 } 521 522 /** 523 * batadv_softif_vlan_get() - get the vlan object for a specific vid 524 * @bat_priv: the bat priv with all the soft interface information 525 * @vid: the identifier of the vlan object to retrieve 526 * 527 * Return: the private data of the vlan matching the vid passed as argument or 528 * NULL otherwise. The refcounter of the returned object is incremented by 1. 529 */ 530 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 531 unsigned short vid) 532 { 533 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 534 535 rcu_read_lock(); 536 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 537 if (vlan_tmp->vid != vid) 538 continue; 539 540 if (!kref_get_unless_zero(&vlan_tmp->refcount)) 541 continue; 542 543 vlan = vlan_tmp; 544 break; 545 } 546 rcu_read_unlock(); 547 548 return vlan; 549 } 550 551 /** 552 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan 553 * @bat_priv: the bat priv with all the soft interface information 554 * @vid: the VLAN identifier 555 * 556 * Return: 0 on success, a negative error otherwise. 557 */ 558 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 559 { 560 struct batadv_softif_vlan *vlan; 561 562 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 563 564 vlan = batadv_softif_vlan_get(bat_priv, vid); 565 if (vlan) { 566 batadv_softif_vlan_put(vlan); 567 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 568 return -EEXIST; 569 } 570 571 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 572 if (!vlan) { 573 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 574 return -ENOMEM; 575 } 576 577 vlan->bat_priv = bat_priv; 578 vlan->vid = vid; 579 kref_init(&vlan->refcount); 580 581 atomic_set(&vlan->ap_isolation, 0); 582 583 kref_get(&vlan->refcount); 584 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 585 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 586 587 /* add a new TT local entry. This one will be marked with the NOPURGE 588 * flag 589 */ 590 batadv_tt_local_add(bat_priv->soft_iface, 591 bat_priv->soft_iface->dev_addr, vid, 592 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 593 594 /* don't return reference to new softif_vlan */ 595 batadv_softif_vlan_put(vlan); 596 597 return 0; 598 } 599 600 /** 601 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object 602 * @bat_priv: the bat priv with all the soft interface information 603 * @vlan: the object to remove 604 */ 605 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 606 struct batadv_softif_vlan *vlan) 607 { 608 /* explicitly remove the associated TT local entry because it is marked 609 * with the NOPURGE flag 610 */ 611 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 612 vlan->vid, "vlan interface destroyed", false); 613 614 batadv_softif_vlan_put(vlan); 615 } 616 617 /** 618 * batadv_interface_add_vid() - ndo_add_vid API implementation 619 * @dev: the netdev of the mesh interface 620 * @proto: protocol of the vlan id 621 * @vid: identifier of the new vlan 622 * 623 * Set up all the internal structures for handling the new vlan on top of the 624 * mesh interface 625 * 626 * Return: 0 on success or a negative error code in case of failure. 627 */ 628 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 629 unsigned short vid) 630 { 631 struct batadv_priv *bat_priv = netdev_priv(dev); 632 struct batadv_softif_vlan *vlan; 633 634 /* only 802.1Q vlans are supported. 635 * batman-adv does not know how to handle other types 636 */ 637 if (proto != htons(ETH_P_8021Q)) 638 return -EINVAL; 639 640 vid |= BATADV_VLAN_HAS_TAG; 641 642 /* if a new vlan is getting created and it already exists, it means that 643 * it was not deleted yet. batadv_softif_vlan_get() increases the 644 * refcount in order to revive the object. 645 * 646 * if it does not exist then create it. 647 */ 648 vlan = batadv_softif_vlan_get(bat_priv, vid); 649 if (!vlan) 650 return batadv_softif_create_vlan(bat_priv, vid); 651 652 /* add a new TT local entry. This one will be marked with the NOPURGE 653 * flag. This must be added again, even if the vlan object already 654 * exists, because the entry was deleted by kill_vid() 655 */ 656 batadv_tt_local_add(bat_priv->soft_iface, 657 bat_priv->soft_iface->dev_addr, vid, 658 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 659 660 return 0; 661 } 662 663 /** 664 * batadv_interface_kill_vid() - ndo_kill_vid API implementation 665 * @dev: the netdev of the mesh interface 666 * @proto: protocol of the vlan id 667 * @vid: identifier of the deleted vlan 668 * 669 * Destroy all the internal structures used to handle the vlan identified by vid 670 * on top of the mesh interface 671 * 672 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 673 * or -ENOENT if the specified vlan id wasn't registered. 674 */ 675 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 676 unsigned short vid) 677 { 678 struct batadv_priv *bat_priv = netdev_priv(dev); 679 struct batadv_softif_vlan *vlan; 680 681 /* only 802.1Q vlans are supported. batman-adv does not know how to 682 * handle other types 683 */ 684 if (proto != htons(ETH_P_8021Q)) 685 return -EINVAL; 686 687 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 688 if (!vlan) 689 return -ENOENT; 690 691 batadv_softif_destroy_vlan(bat_priv, vlan); 692 693 /* finally free the vlan object */ 694 batadv_softif_vlan_put(vlan); 695 696 return 0; 697 } 698 699 /* batman-adv network devices have devices nesting below it and are a special 700 * "super class" of normal network devices; split their locks off into a 701 * separate class since they always nest. 702 */ 703 static struct lock_class_key batadv_netdev_xmit_lock_key; 704 static struct lock_class_key batadv_netdev_addr_lock_key; 705 706 /** 707 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue 708 * @dev: device which owns the tx queue 709 * @txq: tx queue to modify 710 * @_unused: always NULL 711 */ 712 static void batadv_set_lockdep_class_one(struct net_device *dev, 713 struct netdev_queue *txq, 714 void *_unused) 715 { 716 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 717 } 718 719 /** 720 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class 721 * @dev: network device to modify 722 */ 723 static void batadv_set_lockdep_class(struct net_device *dev) 724 { 725 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 726 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 727 } 728 729 /** 730 * batadv_softif_init_late() - late stage initialization of soft interface 731 * @dev: registered network device to modify 732 * 733 * Return: error code on failures 734 */ 735 static int batadv_softif_init_late(struct net_device *dev) 736 { 737 struct batadv_priv *bat_priv; 738 u32 random_seqno; 739 int ret; 740 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 741 742 batadv_set_lockdep_class(dev); 743 744 bat_priv = netdev_priv(dev); 745 bat_priv->soft_iface = dev; 746 747 /* batadv_interface_stats() needs to be available as soon as 748 * register_netdevice() has been called 749 */ 750 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 751 if (!bat_priv->bat_counters) 752 return -ENOMEM; 753 754 atomic_set(&bat_priv->aggregated_ogms, 1); 755 atomic_set(&bat_priv->bonding, 0); 756 #ifdef CONFIG_BATMAN_ADV_BLA 757 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 758 #endif 759 #ifdef CONFIG_BATMAN_ADV_DAT 760 atomic_set(&bat_priv->distributed_arp_table, 1); 761 #endif 762 #ifdef CONFIG_BATMAN_ADV_MCAST 763 atomic_set(&bat_priv->multicast_mode, 1); 764 atomic_set(&bat_priv->multicast_fanout, 16); 765 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 766 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 767 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 768 atomic_set(&bat_priv->mcast.num_no_mc_ptype_capa, 0); 769 #endif 770 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); 771 atomic_set(&bat_priv->gw.bandwidth_down, 100); 772 atomic_set(&bat_priv->gw.bandwidth_up, 20); 773 atomic_set(&bat_priv->orig_interval, 1000); 774 atomic_set(&bat_priv->hop_penalty, 30); 775 #ifdef CONFIG_BATMAN_ADV_DEBUG 776 atomic_set(&bat_priv->log_level, 0); 777 #endif 778 atomic_set(&bat_priv->fragmentation, 1); 779 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 780 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 781 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 782 783 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 784 atomic_set(&bat_priv->bcast_seqno, 1); 785 atomic_set(&bat_priv->tt.vn, 0); 786 atomic_set(&bat_priv->tt.local_changes, 0); 787 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 788 #ifdef CONFIG_BATMAN_ADV_BLA 789 atomic_set(&bat_priv->bla.num_requests, 0); 790 #endif 791 atomic_set(&bat_priv->tp_num, 0); 792 793 bat_priv->tt.last_changeset = NULL; 794 bat_priv->tt.last_changeset_len = 0; 795 bat_priv->isolation_mark = 0; 796 bat_priv->isolation_mark_mask = 0; 797 798 /* randomize initial seqno to avoid collision */ 799 get_random_bytes(&random_seqno, sizeof(random_seqno)); 800 atomic_set(&bat_priv->frag_seqno, random_seqno); 801 802 bat_priv->primary_if = NULL; 803 804 batadv_nc_init_bat_priv(bat_priv); 805 806 if (!bat_priv->algo_ops) { 807 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 808 if (ret < 0) 809 goto free_bat_counters; 810 } 811 812 ret = batadv_mesh_init(dev); 813 if (ret < 0) 814 goto free_bat_counters; 815 816 return 0; 817 818 free_bat_counters: 819 free_percpu(bat_priv->bat_counters); 820 bat_priv->bat_counters = NULL; 821 822 return ret; 823 } 824 825 /** 826 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface 827 * @dev: batadv_soft_interface used as master interface 828 * @slave_dev: net_device which should become the slave interface 829 * @extack: extended ACK report struct 830 * 831 * Return: 0 if successful or error otherwise. 832 */ 833 static int batadv_softif_slave_add(struct net_device *dev, 834 struct net_device *slave_dev, 835 struct netlink_ext_ack *extack) 836 { 837 struct batadv_hard_iface *hard_iface; 838 int ret = -EINVAL; 839 840 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 841 if (!hard_iface || hard_iface->soft_iface) 842 goto out; 843 844 ret = batadv_hardif_enable_interface(hard_iface, dev); 845 846 out: 847 batadv_hardif_put(hard_iface); 848 return ret; 849 } 850 851 /** 852 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface 853 * @dev: batadv_soft_interface used as master interface 854 * @slave_dev: net_device which should be removed from the master interface 855 * 856 * Return: 0 if successful or error otherwise. 857 */ 858 static int batadv_softif_slave_del(struct net_device *dev, 859 struct net_device *slave_dev) 860 { 861 struct batadv_hard_iface *hard_iface; 862 int ret = -EINVAL; 863 864 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 865 866 if (!hard_iface || hard_iface->soft_iface != dev) 867 goto out; 868 869 batadv_hardif_disable_interface(hard_iface); 870 ret = 0; 871 872 out: 873 batadv_hardif_put(hard_iface); 874 return ret; 875 } 876 877 static const struct net_device_ops batadv_netdev_ops = { 878 .ndo_init = batadv_softif_init_late, 879 .ndo_open = batadv_interface_open, 880 .ndo_stop = batadv_interface_release, 881 .ndo_get_stats = batadv_interface_stats, 882 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 883 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 884 .ndo_set_mac_address = batadv_interface_set_mac_addr, 885 .ndo_change_mtu = batadv_interface_change_mtu, 886 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 887 .ndo_start_xmit = batadv_interface_tx, 888 .ndo_validate_addr = eth_validate_addr, 889 .ndo_add_slave = batadv_softif_slave_add, 890 .ndo_del_slave = batadv_softif_slave_del, 891 }; 892 893 static void batadv_get_drvinfo(struct net_device *dev, 894 struct ethtool_drvinfo *info) 895 { 896 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 897 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 898 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 899 strscpy(info->bus_info, "batman", sizeof(info->bus_info)); 900 } 901 902 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 903 * Declare each description string in struct.name[] to get fixed sized buffer 904 * and compile time checking for strings longer than ETH_GSTRING_LEN. 905 */ 906 static const struct { 907 const char name[ETH_GSTRING_LEN]; 908 } batadv_counters_strings[] = { 909 { "tx" }, 910 { "tx_bytes" }, 911 { "tx_dropped" }, 912 { "rx" }, 913 { "rx_bytes" }, 914 { "forward" }, 915 { "forward_bytes" }, 916 { "mgmt_tx" }, 917 { "mgmt_tx_bytes" }, 918 { "mgmt_rx" }, 919 { "mgmt_rx_bytes" }, 920 { "frag_tx" }, 921 { "frag_tx_bytes" }, 922 { "frag_rx" }, 923 { "frag_rx_bytes" }, 924 { "frag_fwd" }, 925 { "frag_fwd_bytes" }, 926 { "tt_request_tx" }, 927 { "tt_request_rx" }, 928 { "tt_response_tx" }, 929 { "tt_response_rx" }, 930 { "tt_roam_adv_tx" }, 931 { "tt_roam_adv_rx" }, 932 #ifdef CONFIG_BATMAN_ADV_MCAST 933 { "mcast_tx" }, 934 { "mcast_tx_bytes" }, 935 { "mcast_tx_local" }, 936 { "mcast_tx_local_bytes" }, 937 { "mcast_rx" }, 938 { "mcast_rx_bytes" }, 939 { "mcast_rx_local" }, 940 { "mcast_rx_local_bytes" }, 941 { "mcast_fwd" }, 942 { "mcast_fwd_bytes" }, 943 #endif 944 #ifdef CONFIG_BATMAN_ADV_DAT 945 { "dat_get_tx" }, 946 { "dat_get_rx" }, 947 { "dat_put_tx" }, 948 { "dat_put_rx" }, 949 { "dat_cached_reply_tx" }, 950 #endif 951 #ifdef CONFIG_BATMAN_ADV_NC 952 { "nc_code" }, 953 { "nc_code_bytes" }, 954 { "nc_recode" }, 955 { "nc_recode_bytes" }, 956 { "nc_buffer" }, 957 { "nc_decode" }, 958 { "nc_decode_bytes" }, 959 { "nc_decode_failed" }, 960 { "nc_sniffed" }, 961 #endif 962 }; 963 964 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 965 { 966 if (stringset == ETH_SS_STATS) 967 memcpy(data, batadv_counters_strings, 968 sizeof(batadv_counters_strings)); 969 } 970 971 static void batadv_get_ethtool_stats(struct net_device *dev, 972 struct ethtool_stats *stats, u64 *data) 973 { 974 struct batadv_priv *bat_priv = netdev_priv(dev); 975 int i; 976 977 for (i = 0; i < BATADV_CNT_NUM; i++) 978 data[i] = batadv_sum_counter(bat_priv, i); 979 } 980 981 static int batadv_get_sset_count(struct net_device *dev, int stringset) 982 { 983 if (stringset == ETH_SS_STATS) 984 return BATADV_CNT_NUM; 985 986 return -EOPNOTSUPP; 987 } 988 989 static const struct ethtool_ops batadv_ethtool_ops = { 990 .get_drvinfo = batadv_get_drvinfo, 991 .get_link = ethtool_op_get_link, 992 .get_strings = batadv_get_strings, 993 .get_ethtool_stats = batadv_get_ethtool_stats, 994 .get_sset_count = batadv_get_sset_count, 995 }; 996 997 /** 998 * batadv_softif_free() - Deconstructor of batadv_soft_interface 999 * @dev: Device to cleanup and remove 1000 */ 1001 static void batadv_softif_free(struct net_device *dev) 1002 { 1003 batadv_mesh_free(dev); 1004 1005 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 1006 * their tasks. Wait for them all to be finished before freeing the 1007 * netdev and its private data (bat_priv) 1008 */ 1009 rcu_barrier(); 1010 } 1011 1012 /** 1013 * batadv_softif_init_early() - early stage initialization of soft interface 1014 * @dev: registered network device to modify 1015 */ 1016 static void batadv_softif_init_early(struct net_device *dev) 1017 { 1018 ether_setup(dev); 1019 1020 dev->netdev_ops = &batadv_netdev_ops; 1021 dev->needs_free_netdev = true; 1022 dev->priv_destructor = batadv_softif_free; 1023 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; 1024 dev->features |= NETIF_F_LLTX; 1025 dev->priv_flags |= IFF_NO_QUEUE; 1026 1027 /* can't call min_mtu, because the needed variables 1028 * have not been initialized yet 1029 */ 1030 dev->mtu = ETH_DATA_LEN; 1031 1032 /* generate random address */ 1033 eth_hw_addr_random(dev); 1034 1035 dev->ethtool_ops = &batadv_ethtool_ops; 1036 } 1037 1038 /** 1039 * batadv_softif_validate() - validate configuration of new batadv link 1040 * @tb: IFLA_INFO_DATA netlink attributes 1041 * @data: enum batadv_ifla_attrs attributes 1042 * @extack: extended ACK report struct 1043 * 1044 * Return: 0 if successful or error otherwise. 1045 */ 1046 static int batadv_softif_validate(struct nlattr *tb[], struct nlattr *data[], 1047 struct netlink_ext_ack *extack) 1048 { 1049 struct batadv_algo_ops *algo_ops; 1050 1051 if (!data) 1052 return 0; 1053 1054 if (data[IFLA_BATADV_ALGO_NAME]) { 1055 algo_ops = batadv_algo_get(nla_data(data[IFLA_BATADV_ALGO_NAME])); 1056 if (!algo_ops) 1057 return -EINVAL; 1058 } 1059 1060 return 0; 1061 } 1062 1063 /** 1064 * batadv_softif_newlink() - pre-initialize and register new batadv link 1065 * @src_net: the applicable net namespace 1066 * @dev: network device to register 1067 * @tb: IFLA_INFO_DATA netlink attributes 1068 * @data: enum batadv_ifla_attrs attributes 1069 * @extack: extended ACK report struct 1070 * 1071 * Return: 0 if successful or error otherwise. 1072 */ 1073 static int batadv_softif_newlink(struct net *src_net, struct net_device *dev, 1074 struct nlattr *tb[], struct nlattr *data[], 1075 struct netlink_ext_ack *extack) 1076 { 1077 struct batadv_priv *bat_priv = netdev_priv(dev); 1078 const char *algo_name; 1079 int err; 1080 1081 if (data && data[IFLA_BATADV_ALGO_NAME]) { 1082 algo_name = nla_data(data[IFLA_BATADV_ALGO_NAME]); 1083 err = batadv_algo_select(bat_priv, algo_name); 1084 if (err) 1085 return -EINVAL; 1086 } 1087 1088 return register_netdevice(dev); 1089 } 1090 1091 /** 1092 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via 1093 * netlink 1094 * @soft_iface: the to-be-removed batman-adv interface 1095 * @head: list pointer 1096 */ 1097 static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1098 struct list_head *head) 1099 { 1100 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1101 struct batadv_hard_iface *hard_iface; 1102 struct batadv_softif_vlan *vlan; 1103 1104 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1105 if (hard_iface->soft_iface == soft_iface) 1106 batadv_hardif_disable_interface(hard_iface); 1107 } 1108 1109 /* destroy the "untagged" VLAN */ 1110 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1111 if (vlan) { 1112 batadv_softif_destroy_vlan(bat_priv, vlan); 1113 batadv_softif_vlan_put(vlan); 1114 } 1115 1116 unregister_netdevice_queue(soft_iface, head); 1117 } 1118 1119 /** 1120 * batadv_softif_is_valid() - Check whether device is a batadv soft interface 1121 * @net_dev: device which should be checked 1122 * 1123 * Return: true when net_dev is a batman-adv interface, false otherwise 1124 */ 1125 bool batadv_softif_is_valid(const struct net_device *net_dev) 1126 { 1127 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1128 return true; 1129 1130 return false; 1131 } 1132 1133 static const struct nla_policy batadv_ifla_policy[IFLA_BATADV_MAX + 1] = { 1134 [IFLA_BATADV_ALGO_NAME] = { .type = NLA_NUL_STRING }, 1135 }; 1136 1137 struct rtnl_link_ops batadv_link_ops __read_mostly = { 1138 .kind = "batadv", 1139 .priv_size = sizeof(struct batadv_priv), 1140 .setup = batadv_softif_init_early, 1141 .maxtype = IFLA_BATADV_MAX, 1142 .policy = batadv_ifla_policy, 1143 .validate = batadv_softif_validate, 1144 .newlink = batadv_softif_newlink, 1145 .dellink = batadv_softif_destroy_netlink, 1146 }; 1147