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 */ 64 int 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 83 static int batadv_interface_open(struct net_device *dev) 84 { 85 netif_start_queue(dev); 86 return 0; 87 } 88 89 static 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 */ 102 static 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 } 114 115 static 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 } 127 128 static 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 } 156 157 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 158 { 159 /* check ranges */ 160 if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev)) 161 return -EINVAL; 162 163 dev->mtu = 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 = 1; 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_SINGLE; 202 struct batadv_orig_node *mcast_single_orig = NULL; 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, 305 &mcast_single_orig); 306 if (forw_mode == BATADV_FORW_NONE) 307 goto dropped; 308 309 if (forw_mode == BATADV_FORW_SINGLE || 310 forw_mode == BATADV_FORW_SOME) 311 do_bcast = false; 312 } 313 } 314 315 batadv_skb_set_priority(skb, 0); 316 317 /* ethernet packet should be broadcasted */ 318 if (do_bcast) { 319 primary_if = batadv_primary_if_get_selected(bat_priv); 320 if (!primary_if) 321 goto dropped; 322 323 /* in case of ARP request, we do not immediately broadcasti the 324 * packet, instead we first wait for DAT to try to retrieve the 325 * correct ARP entry 326 */ 327 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 328 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 329 330 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 331 goto dropped; 332 333 bcast_packet = (struct batadv_bcast_packet *)skb->data; 334 bcast_packet->version = BATADV_COMPAT_VERSION; 335 bcast_packet->ttl = BATADV_TTL; 336 337 /* batman packet type: broadcast */ 338 bcast_packet->packet_type = BATADV_BCAST; 339 bcast_packet->reserved = 0; 340 341 /* hw address of first interface is the orig mac because only 342 * this mac is known throughout the mesh 343 */ 344 ether_addr_copy(bcast_packet->orig, 345 primary_if->net_dev->dev_addr); 346 347 /* set broadcast sequence number */ 348 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 349 bcast_packet->seqno = htonl(seqno); 350 351 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true); 352 353 /* a copy is stored in the bcast list, therefore removing 354 * the original skb. 355 */ 356 consume_skb(skb); 357 358 /* 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 (mcast_single_orig) { 367 ret = batadv_send_skb_unicast(bat_priv, skb, 368 BATADV_UNICAST, 0, 369 mcast_single_orig, vid); 370 } else if (forw_mode == BATADV_FORW_SOME) { 371 ret = batadv_mcast_forw_send(bat_priv, skb, vid); 372 } else { 373 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 374 skb)) 375 goto dropped; 376 377 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 378 379 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 380 vid); 381 } 382 if (ret != NET_XMIT_SUCCESS) 383 goto dropped_freed; 384 } 385 386 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 387 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 388 goto end; 389 390 dropped: 391 kfree_skb(skb); 392 dropped_freed: 393 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 394 end: 395 if (mcast_single_orig) 396 batadv_orig_node_put(mcast_single_orig); 397 if (primary_if) 398 batadv_hardif_put(primary_if); 399 return NETDEV_TX_OK; 400 } 401 402 /** 403 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface 404 * @soft_iface: local interface which will receive the ethernet frame 405 * @skb: ethernet frame for @soft_iface 406 * @hdr_size: size of already parsed batman-adv header 407 * @orig_node: originator from which the batman-adv packet was sent 408 * 409 * Sends an ethernet frame to the receive path of the local @soft_iface. 410 * skb->data has still point to the batman-adv header with the size @hdr_size. 411 * The caller has to have parsed this header already and made sure that at least 412 * @hdr_size bytes are still available for pull in @skb. 413 * 414 * The packet may still get dropped. This can happen when the encapsulated 415 * ethernet frame is invalid or contains again an batman-adv packet. Also 416 * unicast packets will be dropped directly when it was sent between two 417 * isolated clients. 418 */ 419 void batadv_interface_rx(struct net_device *soft_iface, 420 struct sk_buff *skb, int hdr_size, 421 struct batadv_orig_node *orig_node) 422 { 423 struct batadv_bcast_packet *batadv_bcast_packet; 424 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 425 struct vlan_ethhdr *vhdr; 426 struct ethhdr *ethhdr; 427 unsigned short vid; 428 bool is_bcast; 429 430 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 431 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 432 433 skb_pull_rcsum(skb, hdr_size); 434 skb_reset_mac_header(skb); 435 436 /* clean the netfilter state now that the batman-adv header has been 437 * removed 438 */ 439 nf_reset_ct(skb); 440 441 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 442 goto dropped; 443 444 vid = batadv_get_vid(skb, 0); 445 ethhdr = eth_hdr(skb); 446 447 switch (ntohs(ethhdr->h_proto)) { 448 case ETH_P_8021Q: 449 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 450 goto dropped; 451 452 vhdr = (struct vlan_ethhdr *)skb->data; 453 454 /* drop batman-in-batman packets to prevent loops */ 455 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) 456 break; 457 458 fallthrough; 459 case ETH_P_BATMAN: 460 goto dropped; 461 } 462 463 /* skb->dev & skb->pkt_type are set here */ 464 skb->protocol = eth_type_trans(skb, soft_iface); 465 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 466 467 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 468 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 469 skb->len + ETH_HLEN); 470 471 /* Let the bridge loop avoidance check the packet. If will 472 * not handle it, we can safely push it up. 473 */ 474 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 475 goto out; 476 477 if (orig_node) 478 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 479 ethhdr->h_source, vid); 480 481 if (is_multicast_ether_addr(ethhdr->h_dest)) { 482 /* set the mark on broadcast packets if AP isolation is ON and 483 * the packet is coming from an "isolated" client 484 */ 485 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 486 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 487 vid)) { 488 /* save bits in skb->mark not covered by the mask and 489 * apply the mark on the rest 490 */ 491 skb->mark &= ~bat_priv->isolation_mark_mask; 492 skb->mark |= bat_priv->isolation_mark; 493 } 494 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 495 ethhdr->h_dest, vid)) { 496 goto dropped; 497 } 498 499 netif_rx(skb); 500 goto out; 501 502 dropped: 503 kfree_skb(skb); 504 out: 505 return; 506 } 507 508 /** 509 * batadv_softif_vlan_release() - release vlan from lists and queue for free 510 * after rcu grace period 511 * @ref: kref pointer of the vlan object 512 */ 513 static void batadv_softif_vlan_release(struct kref *ref) 514 { 515 struct batadv_softif_vlan *vlan; 516 517 vlan = container_of(ref, struct batadv_softif_vlan, refcount); 518 519 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 520 hlist_del_rcu(&vlan->list); 521 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 522 523 kfree_rcu(vlan, rcu); 524 } 525 526 /** 527 * batadv_softif_vlan_put() - decrease the vlan object refcounter and 528 * possibly release it 529 * @vlan: the vlan object to release 530 */ 531 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan) 532 { 533 if (!vlan) 534 return; 535 536 kref_put(&vlan->refcount, batadv_softif_vlan_release); 537 } 538 539 /** 540 * batadv_softif_vlan_get() - get the vlan object for a specific vid 541 * @bat_priv: the bat priv with all the soft interface information 542 * @vid: the identifier of the vlan object to retrieve 543 * 544 * Return: the private data of the vlan matching the vid passed as argument or 545 * NULL otherwise. The refcounter of the returned object is incremented by 1. 546 */ 547 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 548 unsigned short vid) 549 { 550 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 551 552 rcu_read_lock(); 553 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 554 if (vlan_tmp->vid != vid) 555 continue; 556 557 if (!kref_get_unless_zero(&vlan_tmp->refcount)) 558 continue; 559 560 vlan = vlan_tmp; 561 break; 562 } 563 rcu_read_unlock(); 564 565 return vlan; 566 } 567 568 /** 569 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan 570 * @bat_priv: the bat priv with all the soft interface information 571 * @vid: the VLAN identifier 572 * 573 * Return: 0 on success, a negative error otherwise. 574 */ 575 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 576 { 577 struct batadv_softif_vlan *vlan; 578 int err; 579 580 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 581 582 vlan = batadv_softif_vlan_get(bat_priv, vid); 583 if (vlan) { 584 batadv_softif_vlan_put(vlan); 585 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 586 return -EEXIST; 587 } 588 589 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 590 if (!vlan) { 591 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 592 return -ENOMEM; 593 } 594 595 vlan->bat_priv = bat_priv; 596 vlan->vid = vid; 597 kref_init(&vlan->refcount); 598 599 atomic_set(&vlan->ap_isolation, 0); 600 601 kref_get(&vlan->refcount); 602 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 603 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 604 605 /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the 606 * sleeping behavior of the sysfs functions and the fs_reclaim lock 607 */ 608 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 609 if (err) { 610 /* ref for the function */ 611 batadv_softif_vlan_put(vlan); 612 613 /* ref for the list */ 614 batadv_softif_vlan_put(vlan); 615 return err; 616 } 617 618 /* add a new TT local entry. This one will be marked with the NOPURGE 619 * flag 620 */ 621 batadv_tt_local_add(bat_priv->soft_iface, 622 bat_priv->soft_iface->dev_addr, vid, 623 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 624 625 /* don't return reference to new softif_vlan */ 626 batadv_softif_vlan_put(vlan); 627 628 return 0; 629 } 630 631 /** 632 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object 633 * @bat_priv: the bat priv with all the soft interface information 634 * @vlan: the object to remove 635 */ 636 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 637 struct batadv_softif_vlan *vlan) 638 { 639 /* explicitly remove the associated TT local entry because it is marked 640 * with the NOPURGE flag 641 */ 642 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 643 vlan->vid, "vlan interface destroyed", false); 644 645 batadv_sysfs_del_vlan(bat_priv, vlan); 646 batadv_softif_vlan_put(vlan); 647 } 648 649 /** 650 * batadv_interface_add_vid() - ndo_add_vid API implementation 651 * @dev: the netdev of the mesh interface 652 * @proto: protocol of the the vlan id 653 * @vid: identifier of the new vlan 654 * 655 * Set up all the internal structures for handling the new vlan on top of the 656 * mesh interface 657 * 658 * Return: 0 on success or a negative error code in case of failure. 659 */ 660 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 661 unsigned short vid) 662 { 663 struct batadv_priv *bat_priv = netdev_priv(dev); 664 struct batadv_softif_vlan *vlan; 665 int ret; 666 667 /* only 802.1Q vlans are supported. 668 * batman-adv does not know how to handle other types 669 */ 670 if (proto != htons(ETH_P_8021Q)) 671 return -EINVAL; 672 673 vid |= BATADV_VLAN_HAS_TAG; 674 675 /* if a new vlan is getting created and it already exists, it means that 676 * it was not deleted yet. batadv_softif_vlan_get() increases the 677 * refcount in order to revive the object. 678 * 679 * if it does not exist then create it. 680 */ 681 vlan = batadv_softif_vlan_get(bat_priv, vid); 682 if (!vlan) 683 return batadv_softif_create_vlan(bat_priv, vid); 684 685 /* recreate the sysfs object if it was already destroyed (and it should 686 * be since we received a kill_vid() for this vlan 687 */ 688 if (!vlan->kobj) { 689 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 690 if (ret) { 691 batadv_softif_vlan_put(vlan); 692 return ret; 693 } 694 } 695 696 /* add a new TT local entry. This one will be marked with the NOPURGE 697 * flag. This must be added again, even if the vlan object already 698 * exists, because the entry was deleted by kill_vid() 699 */ 700 batadv_tt_local_add(bat_priv->soft_iface, 701 bat_priv->soft_iface->dev_addr, vid, 702 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 703 704 return 0; 705 } 706 707 /** 708 * batadv_interface_kill_vid() - ndo_kill_vid API implementation 709 * @dev: the netdev of the mesh interface 710 * @proto: protocol of the the vlan id 711 * @vid: identifier of the deleted vlan 712 * 713 * Destroy all the internal structures used to handle the vlan identified by vid 714 * on top of the mesh interface 715 * 716 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 717 * or -ENOENT if the specified vlan id wasn't registered. 718 */ 719 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 720 unsigned short vid) 721 { 722 struct batadv_priv *bat_priv = netdev_priv(dev); 723 struct batadv_softif_vlan *vlan; 724 725 /* only 802.1Q vlans are supported. batman-adv does not know how to 726 * handle other types 727 */ 728 if (proto != htons(ETH_P_8021Q)) 729 return -EINVAL; 730 731 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 732 if (!vlan) 733 return -ENOENT; 734 735 batadv_softif_destroy_vlan(bat_priv, vlan); 736 737 /* finally free the vlan object */ 738 batadv_softif_vlan_put(vlan); 739 740 return 0; 741 } 742 743 /* batman-adv network devices have devices nesting below it and are a special 744 * "super class" of normal network devices; split their locks off into a 745 * separate class since they always nest. 746 */ 747 static struct lock_class_key batadv_netdev_xmit_lock_key; 748 static struct lock_class_key batadv_netdev_addr_lock_key; 749 750 /** 751 * batadv_set_lockdep_class_one() - Set lockdep class for a single tx queue 752 * @dev: device which owns the tx queue 753 * @txq: tx queue to modify 754 * @_unused: always NULL 755 */ 756 static void batadv_set_lockdep_class_one(struct net_device *dev, 757 struct netdev_queue *txq, 758 void *_unused) 759 { 760 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 761 } 762 763 /** 764 * batadv_set_lockdep_class() - Set txq and addr_list lockdep class 765 * @dev: network device to modify 766 */ 767 static void batadv_set_lockdep_class(struct net_device *dev) 768 { 769 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 770 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 771 } 772 773 /** 774 * batadv_softif_init_late() - late stage initialization of soft interface 775 * @dev: registered network device to modify 776 * 777 * Return: error code on failures 778 */ 779 static int batadv_softif_init_late(struct net_device *dev) 780 { 781 struct batadv_priv *bat_priv; 782 u32 random_seqno; 783 int ret; 784 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 785 786 batadv_set_lockdep_class(dev); 787 788 bat_priv = netdev_priv(dev); 789 bat_priv->soft_iface = dev; 790 791 /* batadv_interface_stats() needs to be available as soon as 792 * register_netdevice() has been called 793 */ 794 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 795 if (!bat_priv->bat_counters) 796 return -ENOMEM; 797 798 atomic_set(&bat_priv->aggregated_ogms, 1); 799 atomic_set(&bat_priv->bonding, 0); 800 #ifdef CONFIG_BATMAN_ADV_BLA 801 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 802 #endif 803 #ifdef CONFIG_BATMAN_ADV_DAT 804 atomic_set(&bat_priv->distributed_arp_table, 1); 805 #endif 806 #ifdef CONFIG_BATMAN_ADV_MCAST 807 atomic_set(&bat_priv->multicast_mode, 1); 808 atomic_set(&bat_priv->multicast_fanout, 16); 809 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 810 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 811 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 812 #endif 813 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); 814 atomic_set(&bat_priv->gw.bandwidth_down, 100); 815 atomic_set(&bat_priv->gw.bandwidth_up, 20); 816 atomic_set(&bat_priv->orig_interval, 1000); 817 atomic_set(&bat_priv->hop_penalty, 30); 818 #ifdef CONFIG_BATMAN_ADV_DEBUG 819 atomic_set(&bat_priv->log_level, 0); 820 #endif 821 atomic_set(&bat_priv->fragmentation, 1); 822 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 823 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 824 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 825 826 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 827 atomic_set(&bat_priv->bcast_seqno, 1); 828 atomic_set(&bat_priv->tt.vn, 0); 829 atomic_set(&bat_priv->tt.local_changes, 0); 830 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 831 #ifdef CONFIG_BATMAN_ADV_BLA 832 atomic_set(&bat_priv->bla.num_requests, 0); 833 #endif 834 atomic_set(&bat_priv->tp_num, 0); 835 836 bat_priv->tt.last_changeset = NULL; 837 bat_priv->tt.last_changeset_len = 0; 838 bat_priv->isolation_mark = 0; 839 bat_priv->isolation_mark_mask = 0; 840 841 /* randomize initial seqno to avoid collision */ 842 get_random_bytes(&random_seqno, sizeof(random_seqno)); 843 atomic_set(&bat_priv->frag_seqno, random_seqno); 844 845 bat_priv->primary_if = NULL; 846 847 batadv_nc_init_bat_priv(bat_priv); 848 849 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 850 if (ret < 0) 851 goto free_bat_counters; 852 853 ret = batadv_debugfs_add_meshif(dev); 854 if (ret < 0) 855 goto free_bat_counters; 856 857 ret = batadv_mesh_init(dev); 858 if (ret < 0) 859 goto unreg_debugfs; 860 861 return 0; 862 863 unreg_debugfs: 864 batadv_debugfs_del_meshif(dev); 865 free_bat_counters: 866 free_percpu(bat_priv->bat_counters); 867 bat_priv->bat_counters = NULL; 868 869 return ret; 870 } 871 872 /** 873 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface 874 * @dev: batadv_soft_interface used as master interface 875 * @slave_dev: net_device which should become the slave interface 876 * @extack: extended ACK report struct 877 * 878 * Return: 0 if successful or error otherwise. 879 */ 880 static int batadv_softif_slave_add(struct net_device *dev, 881 struct net_device *slave_dev, 882 struct netlink_ext_ack *extack) 883 { 884 struct batadv_hard_iface *hard_iface; 885 struct net *net = dev_net(dev); 886 int ret = -EINVAL; 887 888 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 889 if (!hard_iface || hard_iface->soft_iface) 890 goto out; 891 892 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name); 893 894 out: 895 if (hard_iface) 896 batadv_hardif_put(hard_iface); 897 return ret; 898 } 899 900 /** 901 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface 902 * @dev: batadv_soft_interface used as master interface 903 * @slave_dev: net_device which should be removed from the master interface 904 * 905 * Return: 0 if successful or error otherwise. 906 */ 907 static int batadv_softif_slave_del(struct net_device *dev, 908 struct net_device *slave_dev) 909 { 910 struct batadv_hard_iface *hard_iface; 911 int ret = -EINVAL; 912 913 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 914 915 if (!hard_iface || hard_iface->soft_iface != dev) 916 goto out; 917 918 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 919 ret = 0; 920 921 out: 922 if (hard_iface) 923 batadv_hardif_put(hard_iface); 924 return ret; 925 } 926 927 static const struct net_device_ops batadv_netdev_ops = { 928 .ndo_init = batadv_softif_init_late, 929 .ndo_open = batadv_interface_open, 930 .ndo_stop = batadv_interface_release, 931 .ndo_get_stats = batadv_interface_stats, 932 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 933 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 934 .ndo_set_mac_address = batadv_interface_set_mac_addr, 935 .ndo_change_mtu = batadv_interface_change_mtu, 936 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 937 .ndo_start_xmit = batadv_interface_tx, 938 .ndo_validate_addr = eth_validate_addr, 939 .ndo_add_slave = batadv_softif_slave_add, 940 .ndo_del_slave = batadv_softif_slave_del, 941 }; 942 943 static void batadv_get_drvinfo(struct net_device *dev, 944 struct ethtool_drvinfo *info) 945 { 946 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 947 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 948 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 949 strscpy(info->bus_info, "batman", sizeof(info->bus_info)); 950 } 951 952 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 953 * Declare each description string in struct.name[] to get fixed sized buffer 954 * and compile time checking for strings longer than ETH_GSTRING_LEN. 955 */ 956 static const struct { 957 const char name[ETH_GSTRING_LEN]; 958 } batadv_counters_strings[] = { 959 { "tx" }, 960 { "tx_bytes" }, 961 { "tx_dropped" }, 962 { "rx" }, 963 { "rx_bytes" }, 964 { "forward" }, 965 { "forward_bytes" }, 966 { "mgmt_tx" }, 967 { "mgmt_tx_bytes" }, 968 { "mgmt_rx" }, 969 { "mgmt_rx_bytes" }, 970 { "frag_tx" }, 971 { "frag_tx_bytes" }, 972 { "frag_rx" }, 973 { "frag_rx_bytes" }, 974 { "frag_fwd" }, 975 { "frag_fwd_bytes" }, 976 { "tt_request_tx" }, 977 { "tt_request_rx" }, 978 { "tt_response_tx" }, 979 { "tt_response_rx" }, 980 { "tt_roam_adv_tx" }, 981 { "tt_roam_adv_rx" }, 982 #ifdef CONFIG_BATMAN_ADV_DAT 983 { "dat_get_tx" }, 984 { "dat_get_rx" }, 985 { "dat_put_tx" }, 986 { "dat_put_rx" }, 987 { "dat_cached_reply_tx" }, 988 #endif 989 #ifdef CONFIG_BATMAN_ADV_NC 990 { "nc_code" }, 991 { "nc_code_bytes" }, 992 { "nc_recode" }, 993 { "nc_recode_bytes" }, 994 { "nc_buffer" }, 995 { "nc_decode" }, 996 { "nc_decode_bytes" }, 997 { "nc_decode_failed" }, 998 { "nc_sniffed" }, 999 #endif 1000 }; 1001 1002 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 1003 { 1004 if (stringset == ETH_SS_STATS) 1005 memcpy(data, batadv_counters_strings, 1006 sizeof(batadv_counters_strings)); 1007 } 1008 1009 static void batadv_get_ethtool_stats(struct net_device *dev, 1010 struct ethtool_stats *stats, u64 *data) 1011 { 1012 struct batadv_priv *bat_priv = netdev_priv(dev); 1013 int i; 1014 1015 for (i = 0; i < BATADV_CNT_NUM; i++) 1016 data[i] = batadv_sum_counter(bat_priv, i); 1017 } 1018 1019 static int batadv_get_sset_count(struct net_device *dev, int stringset) 1020 { 1021 if (stringset == ETH_SS_STATS) 1022 return BATADV_CNT_NUM; 1023 1024 return -EOPNOTSUPP; 1025 } 1026 1027 static const struct ethtool_ops batadv_ethtool_ops = { 1028 .get_drvinfo = batadv_get_drvinfo, 1029 .get_link = ethtool_op_get_link, 1030 .get_strings = batadv_get_strings, 1031 .get_ethtool_stats = batadv_get_ethtool_stats, 1032 .get_sset_count = batadv_get_sset_count, 1033 }; 1034 1035 /** 1036 * batadv_softif_free() - Deconstructor of batadv_soft_interface 1037 * @dev: Device to cleanup and remove 1038 */ 1039 static void batadv_softif_free(struct net_device *dev) 1040 { 1041 batadv_debugfs_del_meshif(dev); 1042 batadv_mesh_free(dev); 1043 1044 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 1045 * their tasks. Wait for them all to be finished before freeing the 1046 * netdev and its private data (bat_priv) 1047 */ 1048 rcu_barrier(); 1049 } 1050 1051 /** 1052 * batadv_softif_init_early() - early stage initialization of soft interface 1053 * @dev: registered network device to modify 1054 */ 1055 static void batadv_softif_init_early(struct net_device *dev) 1056 { 1057 ether_setup(dev); 1058 1059 dev->netdev_ops = &batadv_netdev_ops; 1060 dev->needs_free_netdev = true; 1061 dev->priv_destructor = batadv_softif_free; 1062 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; 1063 dev->features |= NETIF_F_LLTX; 1064 dev->priv_flags |= IFF_NO_QUEUE; 1065 1066 /* can't call min_mtu, because the needed variables 1067 * have not been initialized yet 1068 */ 1069 dev->mtu = ETH_DATA_LEN; 1070 1071 /* generate random address */ 1072 eth_hw_addr_random(dev); 1073 1074 dev->ethtool_ops = &batadv_ethtool_ops; 1075 } 1076 1077 /** 1078 * batadv_softif_create() - Create and register soft interface 1079 * @net: the applicable net namespace 1080 * @name: name of the new soft interface 1081 * 1082 * Return: newly allocated soft_interface, NULL on errors 1083 */ 1084 struct net_device *batadv_softif_create(struct net *net, const char *name) 1085 { 1086 struct net_device *soft_iface; 1087 int ret; 1088 1089 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 1090 NET_NAME_UNKNOWN, batadv_softif_init_early); 1091 if (!soft_iface) 1092 return NULL; 1093 1094 dev_net_set(soft_iface, net); 1095 1096 soft_iface->rtnl_link_ops = &batadv_link_ops; 1097 1098 ret = register_netdevice(soft_iface); 1099 if (ret < 0) { 1100 pr_err("Unable to register the batman interface '%s': %i\n", 1101 name, ret); 1102 free_netdev(soft_iface); 1103 return NULL; 1104 } 1105 1106 return soft_iface; 1107 } 1108 1109 /** 1110 * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs 1111 * @soft_iface: the to-be-removed batman-adv interface 1112 */ 1113 void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 1114 { 1115 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1116 struct batadv_softif_vlan *vlan; 1117 1118 ASSERT_RTNL(); 1119 1120 /* destroy the "untagged" VLAN */ 1121 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1122 if (vlan) { 1123 batadv_softif_destroy_vlan(bat_priv, vlan); 1124 batadv_softif_vlan_put(vlan); 1125 } 1126 1127 batadv_sysfs_del_meshif(soft_iface); 1128 unregister_netdevice(soft_iface); 1129 } 1130 1131 /** 1132 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via 1133 * netlink 1134 * @soft_iface: the to-be-removed batman-adv interface 1135 * @head: list pointer 1136 */ 1137 static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1138 struct list_head *head) 1139 { 1140 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1141 struct batadv_hard_iface *hard_iface; 1142 struct batadv_softif_vlan *vlan; 1143 1144 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1145 if (hard_iface->soft_iface == soft_iface) 1146 batadv_hardif_disable_interface(hard_iface, 1147 BATADV_IF_CLEANUP_KEEP); 1148 } 1149 1150 /* destroy the "untagged" VLAN */ 1151 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1152 if (vlan) { 1153 batadv_softif_destroy_vlan(bat_priv, vlan); 1154 batadv_softif_vlan_put(vlan); 1155 } 1156 1157 batadv_sysfs_del_meshif(soft_iface); 1158 unregister_netdevice_queue(soft_iface, head); 1159 } 1160 1161 /** 1162 * batadv_softif_is_valid() - Check whether device is a batadv soft interface 1163 * @net_dev: device which should be checked 1164 * 1165 * Return: true when net_dev is a batman-adv interface, false otherwise 1166 */ 1167 bool batadv_softif_is_valid(const struct net_device *net_dev) 1168 { 1169 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1170 return true; 1171 1172 return false; 1173 } 1174 1175 struct rtnl_link_ops batadv_link_ops __read_mostly = { 1176 .kind = "batadv", 1177 .priv_size = sizeof(struct batadv_priv), 1178 .setup = batadv_softif_init_early, 1179 .dellink = batadv_softif_destroy_netlink, 1180 }; 1181