/net/batman-adv/soft-interface.c
C | 1147 lines | 718 code | 171 blank | 258 comment | 105 complexity | f28881d4d2519e742703b65f94f91f3b MD5 | raw file
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/netdevice.h> 26#include <linux/netlink.h> 27#include <linux/percpu.h> 28#include <linux/printk.h> 29#include <linux/random.h> 30#include <linux/rculist.h> 31#include <linux/rcupdate.h> 32#include <linux/rtnetlink.h> 33#include <linux/skbuff.h> 34#include <linux/slab.h> 35#include <linux/socket.h> 36#include <linux/spinlock.h> 37#include <linux/stddef.h> 38#include <linux/string.h> 39#include <linux/types.h> 40#include <uapi/linux/batadv_packet.h> 41#include <uapi/linux/batman_adv.h> 42 43#include "bat_algo.h" 44#include "bridge_loop_avoidance.h" 45#include "debugfs.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 "originator.h" 52#include "send.h" 53#include "sysfs.h" 54#include "translation-table.h" 55 56/** 57 * batadv_skb_head_push() - Increase header size and move (push) head pointer 58 * @skb: packet buffer which should be modified 59 * @len: number of bytes to add 60 * 61 * Return: 0 on success or negative error number in case of failure 62 */ 63int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) 64{ 65 int result; 66 67 /* TODO: We must check if we can release all references to non-payload 68 * data using __skb_header_release in our skbs to allow skb_cow_header 69 * to work optimally. This means that those skbs are not allowed to read 70 * or write any data which is before the current position of skb->data 71 * after that call and thus allow other skbs with the same data buffer 72 * to write freely in that area. 73 */ 74 result = skb_cow_head(skb, len); 75 if (result < 0) 76 return result; 77 78 skb_push(skb, len); 79 return 0; 80} 81 82static int batadv_interface_open(struct net_device *dev) 83{ 84 netif_start_queue(dev); 85 return 0; 86} 87 88static int batadv_interface_release(struct net_device *dev) 89{ 90 netif_stop_queue(dev); 91 return 0; 92} 93 94/** 95 * batadv_sum_counter() - Sum the cpu-local counters for index 'idx' 96 * @bat_priv: the bat priv with all the soft interface information 97 * @idx: index of counter to sum up 98 * 99 * Return: sum of all cpu-local counters 100 */ 101static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx) 102{ 103 u64 *counters, sum = 0; 104 int cpu; 105 106 for_each_possible_cpu(cpu) { 107 counters = per_cpu_ptr(bat_priv->bat_counters, cpu); 108 sum += counters[idx]; 109 } 110 111 return sum; 112} 113 114static struct net_device_stats *batadv_interface_stats(struct net_device *dev) 115{ 116 struct batadv_priv *bat_priv = netdev_priv(dev); 117 struct net_device_stats *stats = &dev->stats; 118 119 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); 120 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); 121 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); 122 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); 123 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); 124 return stats; 125} 126 127static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) 128{ 129 struct batadv_priv *bat_priv = netdev_priv(dev); 130 struct batadv_softif_vlan *vlan; 131 struct sockaddr *addr = p; 132 u8 old_addr[ETH_ALEN]; 133 134 if (!is_valid_ether_addr(addr->sa_data)) 135 return -EADDRNOTAVAIL; 136 137 ether_addr_copy(old_addr, dev->dev_addr); 138 ether_addr_copy(dev->dev_addr, addr->sa_data); 139 140 /* only modify transtable if it has been initialized before */ 141 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 142 return 0; 143 144 rcu_read_lock(); 145 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 146 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, 147 "mac address changed", false); 148 batadv_tt_local_add(dev, addr->sa_data, vlan->vid, 149 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 150 } 151 rcu_read_unlock(); 152 153 return 0; 154} 155 156static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 157{ 158 /* check ranges */ 159 if (new_mtu < 68 || new_mtu > batadv_hardif_min_mtu(dev)) 160 return -EINVAL; 161 162 dev->mtu = new_mtu; 163 164 return 0; 165} 166 167/** 168 * batadv_interface_set_rx_mode() - set the rx mode of a device 169 * @dev: registered network device to modify 170 * 171 * We do not actually need to set any rx filters for the virtual batman 172 * soft interface. However a dummy handler enables a user to set static 173 * multicast listeners for instance. 174 */ 175static void batadv_interface_set_rx_mode(struct net_device *dev) 176{ 177} 178 179static netdev_tx_t batadv_interface_tx(struct sk_buff *skb, 180 struct net_device *soft_iface) 181{ 182 struct ethhdr *ethhdr; 183 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 184 struct batadv_hard_iface *primary_if = NULL; 185 struct batadv_bcast_packet *bcast_packet; 186 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 187 0x00, 0x00}; 188 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 189 0x00, 0x00}; 190 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 191 u8 *dst_hint = NULL, chaddr[ETH_ALEN]; 192 struct vlan_ethhdr *vhdr; 193 unsigned int header_len = 0; 194 int data_len = skb->len, ret; 195 unsigned long brd_delay = 1; 196 bool do_bcast = false, client_added; 197 unsigned short vid; 198 u32 seqno; 199 int gw_mode; 200 enum batadv_forw_mode forw_mode = BATADV_FORW_SINGLE; 201 struct batadv_orig_node *mcast_single_orig = NULL; 202 int network_offset = ETH_HLEN; 203 __be16 proto; 204 205 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 206 goto dropped; 207 208 /* reset control block to avoid left overs from previous users */ 209 memset(skb->cb, 0, sizeof(struct batadv_skb_cb)); 210 211 netif_trans_update(soft_iface); 212 vid = batadv_get_vid(skb, 0); 213 214 skb_reset_mac_header(skb); 215 ethhdr = eth_hdr(skb); 216 217 proto = ethhdr->h_proto; 218 219 switch (ntohs(proto)) { 220 case ETH_P_8021Q: 221 if (!pskb_may_pull(skb, sizeof(*vhdr))) 222 goto dropped; 223 vhdr = vlan_eth_hdr(skb); 224 proto = vhdr->h_vlan_encapsulated_proto; 225 226 /* drop batman-in-batman packets to prevent loops */ 227 if (proto != htons(ETH_P_BATMAN)) { 228 network_offset += VLAN_HLEN; 229 break; 230 } 231 232 fallthrough; 233 case ETH_P_BATMAN: 234 goto dropped; 235 } 236 237 skb_set_network_header(skb, network_offset); 238 239 if (batadv_bla_tx(bat_priv, skb, vid)) 240 goto dropped; 241 242 /* skb->data might have been reallocated by batadv_bla_tx() */ 243 ethhdr = eth_hdr(skb); 244 245 /* Register the client MAC in the transtable */ 246 if (!is_multicast_ether_addr(ethhdr->h_source) && 247 !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) { 248 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 249 vid, skb->skb_iif, 250 skb->mark); 251 if (!client_added) 252 goto dropped; 253 } 254 255 /* Snoop address candidates from DHCPACKs for early DAT filling */ 256 batadv_dat_snoop_outgoing_dhcp_ack(bat_priv, skb, proto, vid); 257 258 /* don't accept stp packets. STP does not help in meshes. 259 * better use the bridge loop avoidance ... 260 * 261 * The same goes for ECTP sent at least by some Cisco Switches, 262 * it might confuse the mesh when used with bridge loop avoidance. 263 */ 264 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 265 goto dropped; 266 267 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 268 goto dropped; 269 270 gw_mode = atomic_read(&bat_priv->gw.mode); 271 if (is_multicast_ether_addr(ethhdr->h_dest)) { 272 /* if gw mode is off, broadcast every packet */ 273 if (gw_mode == BATADV_GW_MODE_OFF) { 274 do_bcast = true; 275 goto send; 276 } 277 278 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 279 chaddr); 280 /* skb->data may have been modified by 281 * batadv_gw_dhcp_recipient_get() 282 */ 283 ethhdr = eth_hdr(skb); 284 /* if gw_mode is on, broadcast any non-DHCP message. 285 * All the DHCP packets are going to be sent as unicast 286 */ 287 if (dhcp_rcp == BATADV_DHCP_NO) { 288 do_bcast = true; 289 goto send; 290 } 291 292 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 293 dst_hint = chaddr; 294 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 295 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 296 /* gateways should not forward any DHCP message if 297 * directed to a DHCP server 298 */ 299 goto dropped; 300 301send: 302 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 303 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 304 &mcast_single_orig); 305 if (forw_mode == BATADV_FORW_NONE) 306 goto dropped; 307 308 if (forw_mode == BATADV_FORW_SINGLE || 309 forw_mode == BATADV_FORW_SOME) 310 do_bcast = false; 311 } 312 } 313 314 batadv_skb_set_priority(skb, 0); 315 316 /* ethernet packet should be broadcasted */ 317 if (do_bcast) { 318 primary_if = batadv_primary_if_get_selected(bat_priv); 319 if (!primary_if) 320 goto dropped; 321 322 /* in case of ARP request, we do not immediately broadcasti the 323 * packet, instead we first wait for DAT to try to retrieve the 324 * correct ARP entry 325 */ 326 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 327 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 328 329 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 330 goto dropped; 331 332 bcast_packet = (struct batadv_bcast_packet *)skb->data; 333 bcast_packet->version = BATADV_COMPAT_VERSION; 334 bcast_packet->ttl = BATADV_TTL; 335 336 /* batman packet type: broadcast */ 337 bcast_packet->packet_type = BATADV_BCAST; 338 bcast_packet->reserved = 0; 339 340 /* hw address of first interface is the orig mac because only 341 * this mac is known throughout the mesh 342 */ 343 ether_addr_copy(bcast_packet->orig, 344 primary_if->net_dev->dev_addr); 345 346 /* set broadcast sequence number */ 347 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 348 bcast_packet->seqno = htonl(seqno); 349 350 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true); 351 352 /* a copy is stored in the bcast list, therefore removing 353 * the original skb. 354 */ 355 consume_skb(skb); 356 357 /* 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 (mcast_single_orig) { 366 ret = batadv_send_skb_unicast(bat_priv, skb, 367 BATADV_UNICAST, 0, 368 mcast_single_orig, vid); 369 } else if (forw_mode == BATADV_FORW_SOME) { 370 ret = batadv_mcast_forw_send(bat_priv, skb, vid); 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 389dropped: 390 kfree_skb(skb); 391dropped_freed: 392 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 393end: 394 if (mcast_single_orig) 395 batadv_orig_node_put(mcast_single_orig); 396 if (primary_if) 397 batadv_hardif_put(primary_if); 398 return NETDEV_TX_OK; 399} 400 401/** 402 * batadv_interface_rx() - receive ethernet frame on local batman-adv interface 403 * @soft_iface: local interface which will receive the ethernet frame 404 * @skb: ethernet frame for @soft_iface 405 * @hdr_size: size of already parsed batman-adv header 406 * @orig_node: originator from which the batman-adv packet was sent 407 * 408 * Sends a ethernet frame to the receive path of the local @soft_iface. 409 * skb->data has still point to the batman-adv header with the size @hdr_size. 410 * The caller has to have parsed this header already and made sure that at least 411 * @hdr_size bytes are still available for pull in @skb. 412 * 413 * The packet may still get dropped. This can happen when the encapsulated 414 * ethernet frame is invalid or contains again an batman-adv packet. Also 415 * unicast packets will be dropped directly when it was sent between two 416 * isolated clients. 417 */ 418void batadv_interface_rx(struct net_device *soft_iface, 419 struct sk_buff *skb, int hdr_size, 420 struct batadv_orig_node *orig_node) 421{ 422 struct batadv_bcast_packet *batadv_bcast_packet; 423 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 424 struct vlan_ethhdr *vhdr; 425 struct ethhdr *ethhdr; 426 unsigned short vid; 427 bool is_bcast; 428 429 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 430 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 431 432 skb_pull_rcsum(skb, hdr_size); 433 skb_reset_mac_header(skb); 434 435 /* clean the netfilter state now that the batman-adv header has been 436 * removed 437 */ 438 nf_reset_ct(skb); 439 440 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 441 goto dropped; 442 443 vid = batadv_get_vid(skb, 0); 444 ethhdr = eth_hdr(skb); 445 446 switch (ntohs(ethhdr->h_proto)) { 447 case ETH_P_8021Q: 448 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 449 goto dropped; 450 451 vhdr = (struct vlan_ethhdr *)skb->data; 452 453 /* drop batman-in-batman packets to prevent loops */ 454 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) 455 break; 456 457 fallthrough; 458 case ETH_P_BATMAN: 459 goto dropped; 460 } 461 462 /* skb->dev & skb->pkt_type are set here */ 463 skb->protocol = eth_type_trans(skb, soft_iface); 464 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 465 466 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 467 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 468 skb->len + ETH_HLEN); 469 470 /* Let the bridge loop avoidance check the packet. If will 471 * not handle it, we can safely push it up. 472 */ 473 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 474 goto out; 475 476 if (orig_node) 477 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 478 ethhdr->h_source, vid); 479 480 if (is_multicast_ether_addr(ethhdr->h_dest)) { 481 /* set the mark on broadcast packets if AP isolation is ON and 482 * the packet is coming from an "isolated" client 483 */ 484 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 485 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 486 vid)) { 487 /* save bits in skb->mark not covered by the mask and 488 * apply the mark on the rest 489 */ 490 skb->mark &= ~bat_priv->isolation_mark_mask; 491 skb->mark |= bat_priv->isolation_mark; 492 } 493 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 494 ethhdr->h_dest, vid)) { 495 goto dropped; 496 } 497 498 netif_rx(skb); 499 goto out; 500 501dropped: 502 kfree_skb(skb); 503out: 504 return; 505} 506 507/** 508 * batadv_softif_vlan_release() - release vlan from lists and queue for free 509 * after rcu grace period 510 * @ref: kref pointer of the vlan object 511 */ 512static void batadv_softif_vlan_release(struct kref *ref) 513{ 514 struct batadv_softif_vlan *vlan; 515 516 vlan = container_of(ref, struct batadv_softif_vlan, refcount); 517 518 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 519 hlist_del_rcu(&vlan->list); 520 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 521 522 kfree_rcu(vlan, rcu); 523} 524 525/** 526 * batadv_softif_vlan_put() - decrease the vlan object refcounter and 527 * possibly release it 528 * @vlan: the vlan object to release 529 */ 530void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan) 531{ 532 if (!vlan) 533 return; 534 535 kref_put(&vlan->refcount, batadv_softif_vlan_release); 536} 537 538/** 539 * batadv_softif_vlan_get() - get the vlan object for a specific vid 540 * @bat_priv: the bat priv with all the soft interface information 541 * @vid: the identifier of the vlan object to retrieve 542 * 543 * Return: the private data of the vlan matching the vid passed as argument or 544 * NULL otherwise. The refcounter of the returned object is incremented by 1. 545 */ 546struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 547 unsigned short vid) 548{ 549 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 550 551 rcu_read_lock(); 552 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 553 if (vlan_tmp->vid != vid) 554 continue; 555 556 if (!kref_get_unless_zero(&vlan_tmp->refcount)) 557 continue; 558 559 vlan = vlan_tmp; 560 break; 561 } 562 rcu_read_unlock(); 563 564 return vlan; 565} 566 567/** 568 * batadv_softif_create_vlan() - allocate the needed resources for a new vlan 569 * @bat_priv: the bat priv with all the soft interface information 570 * @vid: the VLAN identifier 571 * 572 * Return: 0 on success, a negative error otherwise. 573 */ 574int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 575{ 576 struct batadv_softif_vlan *vlan; 577 int err; 578 579 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 580 581 vlan = batadv_softif_vlan_get(bat_priv, vid); 582 if (vlan) { 583 batadv_softif_vlan_put(vlan); 584 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 585 return -EEXIST; 586 } 587 588 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 589 if (!vlan) { 590 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 591 return -ENOMEM; 592 } 593 594 vlan->bat_priv = bat_priv; 595 vlan->vid = vid; 596 kref_init(&vlan->refcount); 597 598 atomic_set(&vlan->ap_isolation, 0); 599 600 kref_get(&vlan->refcount); 601 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 602 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 603 604 /* batadv_sysfs_add_vlan cannot be in the spinlock section due to the 605 * sleeping behavior of the sysfs functions and the fs_reclaim lock 606 */ 607 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 608 if (err) { 609 /* ref for the function */ 610 batadv_softif_vlan_put(vlan); 611 612 /* ref for the list */ 613 batadv_softif_vlan_put(vlan); 614 return err; 615 } 616 617 /* add a new TT local entry. This one will be marked with the NOPURGE 618 * flag 619 */ 620 batadv_tt_local_add(bat_priv->soft_iface, 621 bat_priv->soft_iface->dev_addr, vid, 622 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 623 624 /* don't return reference to new softif_vlan */ 625 batadv_softif_vlan_put(vlan); 626 627 return 0; 628} 629 630/** 631 * batadv_softif_destroy_vlan() - remove and destroy a softif_vlan object 632 * @bat_priv: the bat priv with all the soft interface information 633 * @vlan: the object to remove 634 */ 635static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 636 struct batadv_softif_vlan *vlan) 637{ 638 /* explicitly remove the associated TT local entry because it is marked 639 * with the NOPURGE flag 640 */ 641 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 642 vlan->vid, "vlan interface destroyed", false); 643 644 batadv_sysfs_del_vlan(bat_priv, vlan); 645 batadv_softif_vlan_put(vlan); 646} 647 648/** 649 * batadv_interface_add_vid() - ndo_add_vid API implementation 650 * @dev: the netdev of the mesh interface 651 * @proto: protocol of the the vlan id 652 * @vid: identifier of the new vlan 653 * 654 * Set up all the internal structures for handling the new vlan on top of the 655 * mesh interface 656 * 657 * Return: 0 on success or a negative error code in case of failure. 658 */ 659static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 660 unsigned short vid) 661{ 662 struct batadv_priv *bat_priv = netdev_priv(dev); 663 struct batadv_softif_vlan *vlan; 664 int ret; 665 666 /* only 802.1Q vlans are supported. 667 * batman-adv does not know how to handle other types 668 */ 669 if (proto != htons(ETH_P_8021Q)) 670 return -EINVAL; 671 672 vid |= BATADV_VLAN_HAS_TAG; 673 674 /* if a new vlan is getting created and it already exists, it means that 675 * it was not deleted yet. batadv_softif_vlan_get() increases the 676 * refcount in order to revive the object. 677 * 678 * if it does not exist then create it. 679 */ 680 vlan = batadv_softif_vlan_get(bat_priv, vid); 681 if (!vlan) 682 return batadv_softif_create_vlan(bat_priv, vid); 683 684 /* recreate the sysfs object if it was already destroyed (and it should 685 * be since we received a kill_vid() for this vlan 686 */ 687 if (!vlan->kobj) { 688 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 689 if (ret) { 690 batadv_softif_vlan_put(vlan); 691 return ret; 692 } 693 } 694 695 /* add a new TT local entry. This one will be marked with the NOPURGE 696 * flag. This must be added again, even if the vlan object already 697 * exists, because the entry was deleted by kill_vid() 698 */ 699 batadv_tt_local_add(bat_priv->soft_iface, 700 bat_priv->soft_iface->dev_addr, vid, 701 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 702 703 return 0; 704} 705 706/** 707 * batadv_interface_kill_vid() - ndo_kill_vid API implementation 708 * @dev: the netdev of the mesh interface 709 * @proto: protocol of the the vlan id 710 * @vid: identifier of the deleted vlan 711 * 712 * Destroy all the internal structures used to handle the vlan identified by vid 713 * on top of the mesh interface 714 * 715 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 716 * or -ENOENT if the specified vlan id wasn't registered. 717 */ 718static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 719 unsigned short vid) 720{ 721 struct batadv_priv *bat_priv = netdev_priv(dev); 722 struct batadv_softif_vlan *vlan; 723 724 /* only 802.1Q vlans are supported. batman-adv does not know how to 725 * handle other types 726 */ 727 if (proto != htons(ETH_P_8021Q)) 728 return -EINVAL; 729 730 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 731 if (!vlan) 732 return -ENOENT; 733 734 batadv_softif_destroy_vlan(bat_priv, vlan); 735 736 /* finally free the vlan object */ 737 batadv_softif_vlan_put(vlan); 738 739 return 0; 740} 741 742/** 743 * batadv_softif_init_late() - late stage initialization of soft interface 744 * @dev: registered network device to modify 745 * 746 * Return: error code on failures 747 */ 748static int batadv_softif_init_late(struct net_device *dev) 749{ 750 struct batadv_priv *bat_priv; 751 u32 random_seqno; 752 int ret; 753 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 754 755 bat_priv = netdev_priv(dev); 756 bat_priv->soft_iface = dev; 757 758 /* batadv_interface_stats() needs to be available as soon as 759 * register_netdevice() has been called 760 */ 761 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 762 if (!bat_priv->bat_counters) 763 return -ENOMEM; 764 765 atomic_set(&bat_priv->aggregated_ogms, 1); 766 atomic_set(&bat_priv->bonding, 0); 767#ifdef CONFIG_BATMAN_ADV_BLA 768 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 769#endif 770#ifdef CONFIG_BATMAN_ADV_DAT 771 atomic_set(&bat_priv->distributed_arp_table, 1); 772#endif 773#ifdef CONFIG_BATMAN_ADV_MCAST 774 atomic_set(&bat_priv->multicast_mode, 1); 775 atomic_set(&bat_priv->multicast_fanout, 16); 776 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 777 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 778 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 779#endif 780 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); 781 atomic_set(&bat_priv->gw.bandwidth_down, 100); 782 atomic_set(&bat_priv->gw.bandwidth_up, 20); 783 atomic_set(&bat_priv->orig_interval, 1000); 784 atomic_set(&bat_priv->hop_penalty, 30); 785#ifdef CONFIG_BATMAN_ADV_DEBUG 786 atomic_set(&bat_priv->log_level, 0); 787#endif 788 atomic_set(&bat_priv->fragmentation, 1); 789 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 790 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 791 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 792 793 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 794 atomic_set(&bat_priv->bcast_seqno, 1); 795 atomic_set(&bat_priv->tt.vn, 0); 796 atomic_set(&bat_priv->tt.local_changes, 0); 797 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 798#ifdef CONFIG_BATMAN_ADV_BLA 799 atomic_set(&bat_priv->bla.num_requests, 0); 800#endif 801 atomic_set(&bat_priv->tp_num, 0); 802 803 bat_priv->tt.last_changeset = NULL; 804 bat_priv->tt.last_changeset_len = 0; 805 bat_priv->isolation_mark = 0; 806 bat_priv->isolation_mark_mask = 0; 807 808 /* randomize initial seqno to avoid collision */ 809 get_random_bytes(&random_seqno, sizeof(random_seqno)); 810 atomic_set(&bat_priv->frag_seqno, random_seqno); 811 812 bat_priv->primary_if = NULL; 813 814 batadv_nc_init_bat_priv(bat_priv); 815 816 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 817 if (ret < 0) 818 goto free_bat_counters; 819 820 ret = batadv_debugfs_add_meshif(dev); 821 if (ret < 0) 822 goto free_bat_counters; 823 824 ret = batadv_mesh_init(dev); 825 if (ret < 0) 826 goto unreg_debugfs; 827 828 return 0; 829 830unreg_debugfs: 831 batadv_debugfs_del_meshif(dev); 832free_bat_counters: 833 free_percpu(bat_priv->bat_counters); 834 bat_priv->bat_counters = NULL; 835 836 return ret; 837} 838 839/** 840 * batadv_softif_slave_add() - Add a slave interface to a batadv_soft_interface 841 * @dev: batadv_soft_interface used as master interface 842 * @slave_dev: net_device which should become the slave interface 843 * @extack: extended ACK report struct 844 * 845 * Return: 0 if successful or error otherwise. 846 */ 847static int batadv_softif_slave_add(struct net_device *dev, 848 struct net_device *slave_dev, 849 struct netlink_ext_ack *extack) 850{ 851 struct batadv_hard_iface *hard_iface; 852 struct net *net = dev_net(dev); 853 int ret = -EINVAL; 854 855 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 856 if (!hard_iface || hard_iface->soft_iface) 857 goto out; 858 859 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name); 860 861out: 862 if (hard_iface) 863 batadv_hardif_put(hard_iface); 864 return ret; 865} 866 867/** 868 * batadv_softif_slave_del() - Delete a slave iface from a batadv_soft_interface 869 * @dev: batadv_soft_interface used as master interface 870 * @slave_dev: net_device which should be removed from the master interface 871 * 872 * Return: 0 if successful or error otherwise. 873 */ 874static int batadv_softif_slave_del(struct net_device *dev, 875 struct net_device *slave_dev) 876{ 877 struct batadv_hard_iface *hard_iface; 878 int ret = -EINVAL; 879 880 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 881 882 if (!hard_iface || hard_iface->soft_iface != dev) 883 goto out; 884 885 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 886 ret = 0; 887 888out: 889 if (hard_iface) 890 batadv_hardif_put(hard_iface); 891 return ret; 892} 893 894static const struct net_device_ops batadv_netdev_ops = { 895 .ndo_init = batadv_softif_init_late, 896 .ndo_open = batadv_interface_open, 897 .ndo_stop = batadv_interface_release, 898 .ndo_get_stats = batadv_interface_stats, 899 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 900 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 901 .ndo_set_mac_address = batadv_interface_set_mac_addr, 902 .ndo_change_mtu = batadv_interface_change_mtu, 903 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 904 .ndo_start_xmit = batadv_interface_tx, 905 .ndo_validate_addr = eth_validate_addr, 906 .ndo_add_slave = batadv_softif_slave_add, 907 .ndo_del_slave = batadv_softif_slave_del, 908}; 909 910static void batadv_get_drvinfo(struct net_device *dev, 911 struct ethtool_drvinfo *info) 912{ 913 strscpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 914 strscpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 915 strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); 916 strscpy(info->bus_info, "batman", sizeof(info->bus_info)); 917} 918 919/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 920 * Declare each description string in struct.name[] to get fixed sized buffer 921 * and compile time checking for strings longer than ETH_GSTRING_LEN. 922 */ 923static const struct { 924 const char name[ETH_GSTRING_LEN]; 925} batadv_counters_strings[] = { 926 { "tx" }, 927 { "tx_bytes" }, 928 { "tx_dropped" }, 929 { "rx" }, 930 { "rx_bytes" }, 931 { "forward" }, 932 { "forward_bytes" }, 933 { "mgmt_tx" }, 934 { "mgmt_tx_bytes" }, 935 { "mgmt_rx" }, 936 { "mgmt_rx_bytes" }, 937 { "frag_tx" }, 938 { "frag_tx_bytes" }, 939 { "frag_rx" }, 940 { "frag_rx_bytes" }, 941 { "frag_fwd" }, 942 { "frag_fwd_bytes" }, 943 { "tt_request_tx" }, 944 { "tt_request_rx" }, 945 { "tt_response_tx" }, 946 { "tt_response_rx" }, 947 { "tt_roam_adv_tx" }, 948 { "tt_roam_adv_rx" }, 949#ifdef CONFIG_BATMAN_ADV_DAT 950 { "dat_get_tx" }, 951 { "dat_get_rx" }, 952 { "dat_put_tx" }, 953 { "dat_put_rx" }, 954 { "dat_cached_reply_tx" }, 955#endif 956#ifdef CONFIG_BATMAN_ADV_NC 957 { "nc_code" }, 958 { "nc_code_bytes" }, 959 { "nc_recode" }, 960 { "nc_recode_bytes" }, 961 { "nc_buffer" }, 962 { "nc_decode" }, 963 { "nc_decode_bytes" }, 964 { "nc_decode_failed" }, 965 { "nc_sniffed" }, 966#endif 967}; 968 969static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 970{ 971 if (stringset == ETH_SS_STATS) 972 memcpy(data, batadv_counters_strings, 973 sizeof(batadv_counters_strings)); 974} 975 976static void batadv_get_ethtool_stats(struct net_device *dev, 977 struct ethtool_stats *stats, u64 *data) 978{ 979 struct batadv_priv *bat_priv = netdev_priv(dev); 980 int i; 981 982 for (i = 0; i < BATADV_CNT_NUM; i++) 983 data[i] = batadv_sum_counter(bat_priv, i); 984} 985 986static int batadv_get_sset_count(struct net_device *dev, int stringset) 987{ 988 if (stringset == ETH_SS_STATS) 989 return BATADV_CNT_NUM; 990 991 return -EOPNOTSUPP; 992} 993 994static const struct ethtool_ops batadv_ethtool_ops = { 995 .get_drvinfo = batadv_get_drvinfo, 996 .get_link = ethtool_op_get_link, 997 .get_strings = batadv_get_strings, 998 .get_ethtool_stats = batadv_get_ethtool_stats, 999 .get_sset_count = batadv_get_sset_count, 1000}; 1001 1002/** 1003 * batadv_softif_free() - Deconstructor of batadv_soft_interface 1004 * @dev: Device to cleanup and remove 1005 */ 1006static void batadv_softif_free(struct net_device *dev) 1007{ 1008 batadv_debugfs_del_meshif(dev); 1009 batadv_mesh_free(dev); 1010 1011 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 1012 * their tasks. Wait for them all to be finished before freeing the 1013 * netdev and its private data (bat_priv) 1014 */ 1015 rcu_barrier(); 1016} 1017 1018/** 1019 * batadv_softif_init_early() - early stage initialization of soft interface 1020 * @dev: registered network device to modify 1021 */ 1022static void batadv_softif_init_early(struct net_device *dev) 1023{ 1024 ether_setup(dev); 1025 1026 dev->netdev_ops = &batadv_netdev_ops; 1027 dev->needs_free_netdev = true; 1028 dev->priv_destructor = batadv_softif_free; 1029 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; 1030 dev->features |= NETIF_F_LLTX; 1031 dev->priv_flags |= IFF_NO_QUEUE; 1032 1033 /* can't call min_mtu, because the needed variables 1034 * have not been initialized yet 1035 */ 1036 dev->mtu = ETH_DATA_LEN; 1037 1038 /* generate random address */ 1039 eth_hw_addr_random(dev); 1040 1041 dev->ethtool_ops = &batadv_ethtool_ops; 1042} 1043 1044/** 1045 * batadv_softif_create() - Create and register soft interface 1046 * @net: the applicable net namespace 1047 * @name: name of the new soft interface 1048 * 1049 * Return: newly allocated soft_interface, NULL on errors 1050 */ 1051struct net_device *batadv_softif_create(struct net *net, const char *name) 1052{ 1053 struct net_device *soft_iface; 1054 int ret; 1055 1056 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 1057 NET_NAME_UNKNOWN, batadv_softif_init_early); 1058 if (!soft_iface) 1059 return NULL; 1060 1061 dev_net_set(soft_iface, net); 1062 1063 soft_iface->rtnl_link_ops = &batadv_link_ops; 1064 1065 ret = register_netdevice(soft_iface); 1066 if (ret < 0) { 1067 pr_err("Unable to register the batman interface '%s': %i\n", 1068 name, ret); 1069 free_netdev(soft_iface); 1070 return NULL; 1071 } 1072 1073 return soft_iface; 1074} 1075 1076/** 1077 * batadv_softif_destroy_sysfs() - deletion of batadv_soft_interface via sysfs 1078 * @soft_iface: the to-be-removed batman-adv interface 1079 */ 1080void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 1081{ 1082 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1083 struct batadv_softif_vlan *vlan; 1084 1085 ASSERT_RTNL(); 1086 1087 /* destroy the "untagged" VLAN */ 1088 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1089 if (vlan) { 1090 batadv_softif_destroy_vlan(bat_priv, vlan); 1091 batadv_softif_vlan_put(vlan); 1092 } 1093 1094 batadv_sysfs_del_meshif(soft_iface); 1095 unregister_netdevice(soft_iface); 1096} 1097 1098/** 1099 * batadv_softif_destroy_netlink() - deletion of batadv_soft_interface via 1100 * netlink 1101 * @soft_iface: the to-be-removed batman-adv interface 1102 * @head: list pointer 1103 */ 1104static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1105 struct list_head *head) 1106{ 1107 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1108 struct batadv_hard_iface *hard_iface; 1109 struct batadv_softif_vlan *vlan; 1110 1111 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1112 if (hard_iface->soft_iface == soft_iface) 1113 batadv_hardif_disable_interface(hard_iface, 1114 BATADV_IF_CLEANUP_KEEP); 1115 } 1116 1117 /* destroy the "untagged" VLAN */ 1118 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1119 if (vlan) { 1120 batadv_softif_destroy_vlan(bat_priv, vlan); 1121 batadv_softif_vlan_put(vlan); 1122 } 1123 1124 batadv_sysfs_del_meshif(soft_iface); 1125 unregister_netdevice_queue(soft_iface, head); 1126} 1127 1128/** 1129 * batadv_softif_is_valid() - Check whether device is a batadv soft interface 1130 * @net_dev: device which should be checked 1131 * 1132 * Return: true when net_dev is a batman-adv interface, false otherwise 1133 */ 1134bool batadv_softif_is_valid(const struct net_device *net_dev) 1135{ 1136 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1137 return true; 1138 1139 return false; 1140} 1141 1142struct rtnl_link_ops batadv_link_ops __read_mostly = { 1143 .kind = "batadv", 1144 .priv_size = sizeof(struct batadv_priv), 1145 .setup = batadv_softif_init_early, 1146 .dellink = batadv_softif_destroy_netlink, 1147};