1/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors: 2 * 3 * Marek Lindner, Simon Wunderlich 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of version 2 of the GNU General Public 7 * License as published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but 10 * WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 * General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, see <http://www.gnu.org/licenses/>. 16 */ 17 18#include "main.h" 19#include "soft-interface.h" 20#include "hard-interface.h" 21#include "distributed-arp-table.h" 22#include "routing.h" 23#include "send.h" 24#include "debugfs.h" 25#include "translation-table.h" 26#include "hash.h" 27#include "gateway_common.h" 28#include "gateway_client.h" 29#include "sysfs.h" 30#include "originator.h" 31#include <linux/slab.h> 32#include <linux/ethtool.h> 33#include <linux/etherdevice.h> 34#include <linux/if_vlan.h> 35#include "multicast.h" 36#include "bridge_loop_avoidance.h" 37#include "network-coding.h" 38 39static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); 40static void batadv_get_drvinfo(struct net_device *dev, 41 struct ethtool_drvinfo *info); 42static u32 batadv_get_msglevel(struct net_device *dev); 43static void batadv_set_msglevel(struct net_device *dev, u32 value); 44static u32 batadv_get_link(struct net_device *dev); 45static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data); 46static void batadv_get_ethtool_stats(struct net_device *dev, 47 struct ethtool_stats *stats, u64 *data); 48static int batadv_get_sset_count(struct net_device *dev, int stringset); 49 50static const struct ethtool_ops batadv_ethtool_ops = { 51 .get_settings = batadv_get_settings, 52 .get_drvinfo = batadv_get_drvinfo, 53 .get_msglevel = batadv_get_msglevel, 54 .set_msglevel = batadv_set_msglevel, 55 .get_link = batadv_get_link, 56 .get_strings = batadv_get_strings, 57 .get_ethtool_stats = batadv_get_ethtool_stats, 58 .get_sset_count = batadv_get_sset_count, 59}; 60 61int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) 62{ 63 int result; 64 65 /* TODO: We must check if we can release all references to non-payload 66 * data using skb_header_release in our skbs to allow skb_cow_header to 67 * work optimally. This means that those skbs are not allowed to read 68 * or write any data which is before the current position of skb->data 69 * after that call and thus allow other skbs with the same data buffer 70 * to write freely in that area. 71 */ 72 result = skb_cow_head(skb, len); 73 if (result < 0) 74 return result; 75 76 skb_push(skb, len); 77 return 0; 78} 79 80static int batadv_interface_open(struct net_device *dev) 81{ 82 netif_start_queue(dev); 83 return 0; 84} 85 86static int batadv_interface_release(struct net_device *dev) 87{ 88 netif_stop_queue(dev); 89 return 0; 90} 91 92static struct net_device_stats *batadv_interface_stats(struct net_device *dev) 93{ 94 struct batadv_priv *bat_priv = netdev_priv(dev); 95 struct net_device_stats *stats = &bat_priv->stats; 96 97 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); 98 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); 99 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); 100 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); 101 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); 102 return stats; 103} 104 105static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) 106{ 107 struct batadv_priv *bat_priv = netdev_priv(dev); 108 struct sockaddr *addr = p; 109 uint8_t old_addr[ETH_ALEN]; 110 111 if (!is_valid_ether_addr(addr->sa_data)) 112 return -EADDRNOTAVAIL; 113 114 ether_addr_copy(old_addr, dev->dev_addr); 115 ether_addr_copy(dev->dev_addr, addr->sa_data); 116 117 /* only modify transtable if it has been initialized before */ 118 if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE) { 119 batadv_tt_local_remove(bat_priv, old_addr, BATADV_NO_FLAGS, 120 "mac address changed", false); 121 batadv_tt_local_add(dev, addr->sa_data, BATADV_NO_FLAGS, 122 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 123 } 124 125 return 0; 126} 127 128static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 129{ 130 /* check ranges */ 131 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev))) 132 return -EINVAL; 133 134 dev->mtu = new_mtu; 135 136 return 0; 137} 138 139/** 140 * batadv_interface_set_rx_mode - set the rx mode of a device 141 * @dev: registered network device to modify 142 * 143 * We do not actually need to set any rx filters for the virtual batman 144 * soft interface. However a dummy handler enables a user to set static 145 * multicast listeners for instance. 146 */ 147static void batadv_interface_set_rx_mode(struct net_device *dev) 148{ 149} 150 151static int batadv_interface_tx(struct sk_buff *skb, 152 struct net_device *soft_iface) 153{ 154 struct ethhdr *ethhdr; 155 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 156 struct batadv_hard_iface *primary_if = NULL; 157 struct batadv_bcast_packet *bcast_packet; 158 __be16 ethertype = htons(ETH_P_BATMAN); 159 static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 160 0x00, 0x00}; 161 static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 162 0x00, 0x00}; 163 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 164 uint8_t *dst_hint = NULL, chaddr[ETH_ALEN]; 165 struct vlan_ethhdr *vhdr; 166 unsigned int header_len = 0; 167 int data_len = skb->len, ret; 168 unsigned long brd_delay = 1; 169 bool do_bcast = false, client_added; 170 unsigned short vid; 171 uint32_t seqno; 172 int gw_mode; 173 enum batadv_forw_mode forw_mode; 174 struct batadv_orig_node *mcast_single_orig = NULL; 175 int network_offset = ETH_HLEN; 176 177 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 178 goto dropped; 179 180 soft_iface->trans_start = jiffies; 181 vid = batadv_get_vid(skb, 0); 182 ethhdr = eth_hdr(skb); 183 184 switch (ntohs(ethhdr->h_proto)) { 185 case ETH_P_8021Q: 186 vhdr = vlan_eth_hdr(skb); 187 188 if (vhdr->h_vlan_encapsulated_proto != ethertype) { 189 network_offset += VLAN_HLEN; 190 break; 191 } 192 193 /* fall through */ 194 case ETH_P_BATMAN: 195 goto dropped; 196 } 197 198 skb_set_network_header(skb, network_offset); 199 200 if (batadv_bla_tx(bat_priv, skb, vid)) 201 goto dropped; 202 203 /* skb->data might have been reallocated by batadv_bla_tx() */ 204 ethhdr = eth_hdr(skb); 205 206 /* Register the client MAC in the transtable */ 207 if (!is_multicast_ether_addr(ethhdr->h_source)) { 208 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 209 vid, skb->skb_iif, 210 skb->mark); 211 if (!client_added) 212 goto dropped; 213 } 214 215 /* don't accept stp packets. STP does not help in meshes. 216 * better use the bridge loop avoidance ... 217 * 218 * The same goes for ECTP sent at least by some Cisco Switches, 219 * it might confuse the mesh when used with bridge loop avoidance. 220 */ 221 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 222 goto dropped; 223 224 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 225 goto dropped; 226 227 gw_mode = atomic_read(&bat_priv->gw_mode); 228 if (is_multicast_ether_addr(ethhdr->h_dest)) { 229 /* if gw mode is off, broadcast every packet */ 230 if (gw_mode == BATADV_GW_MODE_OFF) { 231 do_bcast = true; 232 goto send; 233 } 234 235 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 236 chaddr); 237 /* skb->data may have been modified by 238 * batadv_gw_dhcp_recipient_get() 239 */ 240 ethhdr = eth_hdr(skb); 241 /* if gw_mode is on, broadcast any non-DHCP message. 242 * All the DHCP packets are going to be sent as unicast 243 */ 244 if (dhcp_rcp == BATADV_DHCP_NO) { 245 do_bcast = true; 246 goto send; 247 } 248 249 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 250 dst_hint = chaddr; 251 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 252 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 253 /* gateways should not forward any DHCP message if 254 * directed to a DHCP server 255 */ 256 goto dropped; 257 258send: 259 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 260 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 261 &mcast_single_orig); 262 if (forw_mode == BATADV_FORW_NONE) 263 goto dropped; 264 265 if (forw_mode == BATADV_FORW_SINGLE) 266 do_bcast = false; 267 } 268 } 269 270 batadv_skb_set_priority(skb, 0); 271 272 /* ethernet packet should be broadcasted */ 273 if (do_bcast) { 274 primary_if = batadv_primary_if_get_selected(bat_priv); 275 if (!primary_if) 276 goto dropped; 277 278 /* in case of ARP request, we do not immediately broadcasti the 279 * packet, instead we first wait for DAT to try to retrieve the 280 * correct ARP entry 281 */ 282 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 283 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 284 285 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 286 goto dropped; 287 288 bcast_packet = (struct batadv_bcast_packet *)skb->data; 289 bcast_packet->version = BATADV_COMPAT_VERSION; 290 bcast_packet->ttl = BATADV_TTL; 291 292 /* batman packet type: broadcast */ 293 bcast_packet->packet_type = BATADV_BCAST; 294 bcast_packet->reserved = 0; 295 296 /* hw address of first interface is the orig mac because only 297 * this mac is known throughout the mesh 298 */ 299 ether_addr_copy(bcast_packet->orig, 300 primary_if->net_dev->dev_addr); 301 302 /* set broadcast sequence number */ 303 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 304 bcast_packet->seqno = htonl(seqno); 305 306 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); 307 308 /* a copy is stored in the bcast list, therefore removing 309 * the original skb. 310 */ 311 kfree_skb(skb); 312 313 /* unicast packet */ 314 } else { 315 /* DHCP packets going to a server will use the GW feature */ 316 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 317 ret = batadv_gw_out_of_range(bat_priv, skb); 318 if (ret) 319 goto dropped; 320 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 321 } else if (mcast_single_orig) { 322 ret = batadv_send_skb_unicast(bat_priv, skb, 323 BATADV_UNICAST, 0, 324 mcast_single_orig, vid); 325 } else { 326 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 327 skb)) 328 goto dropped; 329 330 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 331 332 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 333 vid); 334 } 335 if (ret == NET_XMIT_DROP) 336 goto dropped_freed; 337 } 338 339 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 340 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 341 goto end; 342 343dropped: 344 kfree_skb(skb); 345dropped_freed: 346 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 347end: 348 if (primary_if) 349 batadv_hardif_free_ref(primary_if); 350 return NETDEV_TX_OK; 351} 352 353void batadv_interface_rx(struct net_device *soft_iface, 354 struct sk_buff *skb, struct batadv_hard_iface *recv_if, 355 int hdr_size, struct batadv_orig_node *orig_node) 356{ 357 struct batadv_bcast_packet *batadv_bcast_packet; 358 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 359 __be16 ethertype = htons(ETH_P_BATMAN); 360 struct vlan_ethhdr *vhdr; 361 struct ethhdr *ethhdr; 362 unsigned short vid; 363 bool is_bcast; 364 365 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 366 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 367 368 /* check if enough space is available for pulling, and pull */ 369 if (!pskb_may_pull(skb, hdr_size)) 370 goto dropped; 371 372 skb_pull_rcsum(skb, hdr_size); 373 skb_reset_mac_header(skb); 374 375 /* clean the netfilter state now that the batman-adv header has been 376 * removed 377 */ 378 nf_reset(skb); 379 380 vid = batadv_get_vid(skb, 0); 381 ethhdr = eth_hdr(skb); 382 383 switch (ntohs(ethhdr->h_proto)) { 384 case ETH_P_8021Q: 385 vhdr = (struct vlan_ethhdr *)skb->data; 386 387 if (vhdr->h_vlan_encapsulated_proto != ethertype) 388 break; 389 390 /* fall through */ 391 case ETH_P_BATMAN: 392 goto dropped; 393 } 394 395 /* skb->dev & skb->pkt_type are set here */ 396 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 397 goto dropped; 398 skb->protocol = eth_type_trans(skb, soft_iface); 399 400 /* should not be necessary anymore as we use skb_pull_rcsum() 401 * TODO: please verify this and remove this TODO 402 * -- Dec 21st 2009, Simon Wunderlich 403 */ 404 405 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ 406 407 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 408 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 409 skb->len + ETH_HLEN); 410 411 soft_iface->last_rx = jiffies; 412 413 /* Let the bridge loop avoidance check the packet. If will 414 * not handle it, we can safely push it up. 415 */ 416 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 417 goto out; 418 419 if (orig_node) 420 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 421 ethhdr->h_source, vid); 422 423 if (is_multicast_ether_addr(ethhdr->h_dest)) { 424 /* set the mark on broadcast packets if AP isolation is ON and 425 * the packet is coming from an "isolated" client 426 */ 427 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 428 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 429 vid)) { 430 /* save bits in skb->mark not covered by the mask and 431 * apply the mark on the rest 432 */ 433 skb->mark &= ~bat_priv->isolation_mark_mask; 434 skb->mark |= bat_priv->isolation_mark; 435 } 436 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 437 ethhdr->h_dest, vid)) { 438 goto dropped; 439 } 440 441 netif_rx(skb); 442 goto out; 443 444dropped: 445 kfree_skb(skb); 446out: 447 return; 448} 449 450/** 451 * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and 452 * possibly free it 453 * @softif_vlan: the vlan object to release 454 */ 455void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) 456{ 457 if (!vlan) 458 return; 459 460 if (atomic_dec_and_test(&vlan->refcount)) { 461 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 462 hlist_del_rcu(&vlan->list); 463 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 464 465 kfree_rcu(vlan, rcu); 466 } 467} 468 469/** 470 * batadv_softif_vlan_get - get the vlan object for a specific vid 471 * @bat_priv: the bat priv with all the soft interface information 472 * @vid: the identifier of the vlan object to retrieve 473 * 474 * Returns the private data of the vlan matching the vid passed as argument or 475 * NULL otherwise. The refcounter of the returned object is incremented by 1. 476 */ 477struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 478 unsigned short vid) 479{ 480 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 481 482 rcu_read_lock(); 483 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 484 if (vlan_tmp->vid != vid) 485 continue; 486 487 if (!atomic_inc_not_zero(&vlan_tmp->refcount)) 488 continue; 489 490 vlan = vlan_tmp; 491 break; 492 } 493 rcu_read_unlock(); 494 495 return vlan; 496} 497 498/** 499 * batadv_create_vlan - allocate the needed resources for a new vlan 500 * @bat_priv: the bat priv with all the soft interface information 501 * @vid: the VLAN identifier 502 * 503 * Returns 0 on success, a negative error otherwise. 504 */ 505int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 506{ 507 struct batadv_softif_vlan *vlan; 508 int err; 509 510 vlan = batadv_softif_vlan_get(bat_priv, vid); 511 if (vlan) { 512 batadv_softif_vlan_free_ref(vlan); 513 return -EEXIST; 514 } 515 516 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 517 if (!vlan) 518 return -ENOMEM; 519 520 vlan->bat_priv = bat_priv; 521 vlan->vid = vid; 522 atomic_set(&vlan->refcount, 1); 523 524 atomic_set(&vlan->ap_isolation, 0); 525 526 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 527 if (err) { 528 kfree(vlan); 529 return err; 530 } 531 532 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 533 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 534 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 535 536 /* add a new TT local entry. This one will be marked with the NOPURGE 537 * flag 538 */ 539 batadv_tt_local_add(bat_priv->soft_iface, 540 bat_priv->soft_iface->dev_addr, vid, 541 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 542 543 return 0; 544} 545 546/** 547 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object 548 * @bat_priv: the bat priv with all the soft interface information 549 * @vlan: the object to remove 550 */ 551static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 552 struct batadv_softif_vlan *vlan) 553{ 554 /* explicitly remove the associated TT local entry because it is marked 555 * with the NOPURGE flag 556 */ 557 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 558 vlan->vid, "vlan interface destroyed", false); 559 560 batadv_sysfs_del_vlan(bat_priv, vlan); 561 batadv_softif_vlan_free_ref(vlan); 562} 563 564/** 565 * batadv_interface_add_vid - ndo_add_vid API implementation 566 * @dev: the netdev of the mesh interface 567 * @vid: identifier of the new vlan 568 * 569 * Set up all the internal structures for handling the new vlan on top of the 570 * mesh interface 571 * 572 * Returns 0 on success or a negative error code in case of failure. 573 */ 574static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 575 unsigned short vid) 576{ 577 struct batadv_priv *bat_priv = netdev_priv(dev); 578 struct batadv_softif_vlan *vlan; 579 int ret; 580 581 /* only 802.1Q vlans are supported. 582 * batman-adv does not know how to handle other types 583 */ 584 if (proto != htons(ETH_P_8021Q)) 585 return -EINVAL; 586 587 vid |= BATADV_VLAN_HAS_TAG; 588 589 /* if a new vlan is getting created and it already exists, it means that 590 * it was not deleted yet. batadv_softif_vlan_get() increases the 591 * refcount in order to revive the object. 592 * 593 * if it does not exist then create it. 594 */ 595 vlan = batadv_softif_vlan_get(bat_priv, vid); 596 if (!vlan) 597 return batadv_softif_create_vlan(bat_priv, vid); 598 599 /* recreate the sysfs object if it was already destroyed (and it should 600 * be since we received a kill_vid() for this vlan 601 */ 602 if (!vlan->kobj) { 603 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 604 if (ret) { 605 batadv_softif_vlan_free_ref(vlan); 606 return ret; 607 } 608 } 609 610 /* add a new TT local entry. This one will be marked with the NOPURGE 611 * flag. This must be added again, even if the vlan object already 612 * exists, because the entry was deleted by kill_vid() 613 */ 614 batadv_tt_local_add(bat_priv->soft_iface, 615 bat_priv->soft_iface->dev_addr, vid, 616 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 617 618 return 0; 619} 620 621/** 622 * batadv_interface_kill_vid - ndo_kill_vid API implementation 623 * @dev: the netdev of the mesh interface 624 * @vid: identifier of the deleted vlan 625 * 626 * Destroy all the internal structures used to handle the vlan identified by vid 627 * on top of the mesh interface 628 * 629 * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 630 * or -ENOENT if the specified vlan id wasn't registered. 631 */ 632static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 633 unsigned short vid) 634{ 635 struct batadv_priv *bat_priv = netdev_priv(dev); 636 struct batadv_softif_vlan *vlan; 637 638 /* only 802.1Q vlans are supported. batman-adv does not know how to 639 * handle other types 640 */ 641 if (proto != htons(ETH_P_8021Q)) 642 return -EINVAL; 643 644 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 645 if (!vlan) 646 return -ENOENT; 647 648 batadv_softif_destroy_vlan(bat_priv, vlan); 649 650 /* finally free the vlan object */ 651 batadv_softif_vlan_free_ref(vlan); 652 653 return 0; 654} 655 656/* batman-adv network devices have devices nesting below it and are a special 657 * "super class" of normal network devices; split their locks off into a 658 * separate class since they always nest. 659 */ 660static struct lock_class_key batadv_netdev_xmit_lock_key; 661static struct lock_class_key batadv_netdev_addr_lock_key; 662 663/** 664 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue 665 * @dev: device which owns the tx queue 666 * @txq: tx queue to modify 667 * @_unused: always NULL 668 */ 669static void batadv_set_lockdep_class_one(struct net_device *dev, 670 struct netdev_queue *txq, 671 void *_unused) 672{ 673 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 674} 675 676/** 677 * batadv_set_lockdep_class - Set txq and addr_list lockdep class 678 * @dev: network device to modify 679 */ 680static void batadv_set_lockdep_class(struct net_device *dev) 681{ 682 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 683 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 684} 685 686/** 687 * batadv_softif_destroy_finish - cleans up the remains of a softif 688 * @work: work queue item 689 * 690 * Free the parts of the soft interface which can not be removed under 691 * rtnl lock (to prevent deadlock situations). 692 */ 693static void batadv_softif_destroy_finish(struct work_struct *work) 694{ 695 struct batadv_softif_vlan *vlan; 696 struct batadv_priv *bat_priv; 697 struct net_device *soft_iface; 698 699 bat_priv = container_of(work, struct batadv_priv, 700 cleanup_work); 701 soft_iface = bat_priv->soft_iface; 702 703 /* destroy the "untagged" VLAN */ 704 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 705 if (vlan) { 706 batadv_softif_destroy_vlan(bat_priv, vlan); 707 batadv_softif_vlan_free_ref(vlan); 708 } 709 710 batadv_sysfs_del_meshif(soft_iface); 711 unregister_netdev(soft_iface); 712} 713 714/** 715 * batadv_softif_init_late - late stage initialization of soft interface 716 * @dev: registered network device to modify 717 * 718 * Returns error code on failures 719 */ 720static int batadv_softif_init_late(struct net_device *dev) 721{ 722 struct batadv_priv *bat_priv; 723 uint32_t random_seqno; 724 int ret; 725 size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM; 726 727 batadv_set_lockdep_class(dev); 728 729 bat_priv = netdev_priv(dev); 730 bat_priv->soft_iface = dev; 731 INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish); 732 733 /* batadv_interface_stats() needs to be available as soon as 734 * register_netdevice() has been called 735 */ 736 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t)); 737 if (!bat_priv->bat_counters) 738 return -ENOMEM; 739 740 atomic_set(&bat_priv->aggregated_ogms, 1); 741 atomic_set(&bat_priv->bonding, 0); 742#ifdef CONFIG_BATMAN_ADV_BLA 743 atomic_set(&bat_priv->bridge_loop_avoidance, 0); 744#endif 745#ifdef CONFIG_BATMAN_ADV_DAT 746 atomic_set(&bat_priv->distributed_arp_table, 1); 747#endif 748#ifdef CONFIG_BATMAN_ADV_MCAST 749 bat_priv->mcast.flags = BATADV_NO_FLAGS; 750 atomic_set(&bat_priv->multicast_mode, 1); 751 atomic_set(&bat_priv->mcast.num_disabled, 0); 752 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 753 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 754 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 755#endif 756 atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF); 757 atomic_set(&bat_priv->gw_sel_class, 20); 758 atomic_set(&bat_priv->gw.bandwidth_down, 100); 759 atomic_set(&bat_priv->gw.bandwidth_up, 20); 760 atomic_set(&bat_priv->orig_interval, 1000); 761 atomic_set(&bat_priv->hop_penalty, 30); 762#ifdef CONFIG_BATMAN_ADV_DEBUG 763 atomic_set(&bat_priv->log_level, 0); 764#endif 765 atomic_set(&bat_priv->fragmentation, 1); 766 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 767 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 768 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 769 770 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 771 atomic_set(&bat_priv->bcast_seqno, 1); 772 atomic_set(&bat_priv->tt.vn, 0); 773 atomic_set(&bat_priv->tt.local_changes, 0); 774 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 775#ifdef CONFIG_BATMAN_ADV_BLA 776 atomic_set(&bat_priv->bla.num_requests, 0); 777#endif 778 bat_priv->tt.last_changeset = NULL; 779 bat_priv->tt.last_changeset_len = 0; 780 bat_priv->isolation_mark = 0; 781 bat_priv->isolation_mark_mask = 0; 782 783 /* randomize initial seqno to avoid collision */ 784 get_random_bytes(&random_seqno, sizeof(random_seqno)); 785 atomic_set(&bat_priv->frag_seqno, random_seqno); 786 787 bat_priv->primary_if = NULL; 788 bat_priv->num_ifaces = 0; 789 790 batadv_nc_init_bat_priv(bat_priv); 791 792 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 793 if (ret < 0) 794 goto free_bat_counters; 795 796 ret = batadv_debugfs_add_meshif(dev); 797 if (ret < 0) 798 goto free_bat_counters; 799 800 ret = batadv_mesh_init(dev); 801 if (ret < 0) 802 goto unreg_debugfs; 803 804 return 0; 805 806unreg_debugfs: 807 batadv_debugfs_del_meshif(dev); 808free_bat_counters: 809 free_percpu(bat_priv->bat_counters); 810 bat_priv->bat_counters = NULL; 811 812 return ret; 813} 814 815/** 816 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface 817 * @dev: batadv_soft_interface used as master interface 818 * @slave_dev: net_device which should become the slave interface 819 * 820 * Return 0 if successful or error otherwise. 821 */ 822static int batadv_softif_slave_add(struct net_device *dev, 823 struct net_device *slave_dev) 824{ 825 struct batadv_hard_iface *hard_iface; 826 int ret = -EINVAL; 827 828 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 829 if (!hard_iface || hard_iface->soft_iface != NULL) 830 goto out; 831 832 ret = batadv_hardif_enable_interface(hard_iface, dev->name); 833 834out: 835 if (hard_iface) 836 batadv_hardif_free_ref(hard_iface); 837 return ret; 838} 839 840/** 841 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface 842 * @dev: batadv_soft_interface used as master interface 843 * @slave_dev: net_device which should be removed from the master interface 844 * 845 * Return 0 if successful or error otherwise. 846 */ 847static int batadv_softif_slave_del(struct net_device *dev, 848 struct net_device *slave_dev) 849{ 850 struct batadv_hard_iface *hard_iface; 851 int ret = -EINVAL; 852 853 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 854 855 if (!hard_iface || hard_iface->soft_iface != dev) 856 goto out; 857 858 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 859 ret = 0; 860 861out: 862 if (hard_iface) 863 batadv_hardif_free_ref(hard_iface); 864 return ret; 865} 866 867static const struct net_device_ops batadv_netdev_ops = { 868 .ndo_init = batadv_softif_init_late, 869 .ndo_open = batadv_interface_open, 870 .ndo_stop = batadv_interface_release, 871 .ndo_get_stats = batadv_interface_stats, 872 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 873 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 874 .ndo_set_mac_address = batadv_interface_set_mac_addr, 875 .ndo_change_mtu = batadv_interface_change_mtu, 876 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 877 .ndo_start_xmit = batadv_interface_tx, 878 .ndo_validate_addr = eth_validate_addr, 879 .ndo_add_slave = batadv_softif_slave_add, 880 .ndo_del_slave = batadv_softif_slave_del, 881}; 882 883/** 884 * batadv_softif_free - Deconstructor of batadv_soft_interface 885 * @dev: Device to cleanup and remove 886 */ 887static void batadv_softif_free(struct net_device *dev) 888{ 889 batadv_debugfs_del_meshif(dev); 890 batadv_mesh_free(dev); 891 892 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 893 * their tasks. Wait for them all to be finished before freeing the 894 * netdev and its private data (bat_priv) 895 */ 896 rcu_barrier(); 897 898 free_netdev(dev); 899} 900 901/** 902 * batadv_softif_init_early - early stage initialization of soft interface 903 * @dev: registered network device to modify 904 */ 905static void batadv_softif_init_early(struct net_device *dev) 906{ 907 struct batadv_priv *priv = netdev_priv(dev); 908 909 ether_setup(dev); 910 911 dev->netdev_ops = &batadv_netdev_ops; 912 dev->destructor = batadv_softif_free; 913 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 914 dev->tx_queue_len = 0; 915 916 /* can't call min_mtu, because the needed variables 917 * have not been initialized yet 918 */ 919 dev->mtu = ETH_DATA_LEN; 920 /* reserve more space in the skbuff for our header */ 921 dev->hard_header_len = batadv_max_header_len(); 922 923 /* generate random address */ 924 eth_hw_addr_random(dev); 925 926 dev->ethtool_ops = &batadv_ethtool_ops; 927 928 memset(priv, 0, sizeof(*priv)); 929} 930 931struct net_device *batadv_softif_create(const char *name) 932{ 933 struct net_device *soft_iface; 934 int ret; 935 936 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 937 NET_NAME_UNKNOWN, batadv_softif_init_early); 938 if (!soft_iface) 939 return NULL; 940 941 soft_iface->rtnl_link_ops = &batadv_link_ops; 942 943 ret = register_netdevice(soft_iface); 944 if (ret < 0) { 945 pr_err("Unable to register the batman interface '%s': %i\n", 946 name, ret); 947 free_netdev(soft_iface); 948 return NULL; 949 } 950 951 return soft_iface; 952} 953 954/** 955 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs 956 * @soft_iface: the to-be-removed batman-adv interface 957 */ 958void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 959{ 960 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 961 962 queue_work(batadv_event_workqueue, &bat_priv->cleanup_work); 963} 964 965/** 966 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink 967 * @soft_iface: the to-be-removed batman-adv interface 968 * @head: list pointer 969 */ 970static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 971 struct list_head *head) 972{ 973 struct batadv_hard_iface *hard_iface; 974 975 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 976 if (hard_iface->soft_iface == soft_iface) 977 batadv_hardif_disable_interface(hard_iface, 978 BATADV_IF_CLEANUP_KEEP); 979 } 980 981 batadv_sysfs_del_meshif(soft_iface); 982 unregister_netdevice_queue(soft_iface, head); 983} 984 985int batadv_softif_is_valid(const struct net_device *net_dev) 986{ 987 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 988 return 1; 989 990 return 0; 991} 992 993struct rtnl_link_ops batadv_link_ops __read_mostly = { 994 .kind = "batadv", 995 .priv_size = sizeof(struct batadv_priv), 996 .setup = batadv_softif_init_early, 997 .dellink = batadv_softif_destroy_netlink, 998}; 999 1000/* ethtool */ 1001static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1002{ 1003 cmd->supported = 0; 1004 cmd->advertising = 0; 1005 ethtool_cmd_speed_set(cmd, SPEED_10); 1006 cmd->duplex = DUPLEX_FULL; 1007 cmd->port = PORT_TP; 1008 cmd->phy_address = 0; 1009 cmd->transceiver = XCVR_INTERNAL; 1010 cmd->autoneg = AUTONEG_DISABLE; 1011 cmd->maxtxpkt = 0; 1012 cmd->maxrxpkt = 0; 1013 1014 return 0; 1015} 1016 1017static void batadv_get_drvinfo(struct net_device *dev, 1018 struct ethtool_drvinfo *info) 1019{ 1020 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 1021 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 1022 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 1023 strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); 1024} 1025 1026static u32 batadv_get_msglevel(struct net_device *dev) 1027{ 1028 return -EOPNOTSUPP; 1029} 1030 1031static void batadv_set_msglevel(struct net_device *dev, u32 value) 1032{ 1033} 1034 1035static u32 batadv_get_link(struct net_device *dev) 1036{ 1037 return 1; 1038} 1039 1040/* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 1041 * Declare each description string in struct.name[] to get fixed sized buffer 1042 * and compile time checking for strings longer than ETH_GSTRING_LEN. 1043 */ 1044static const struct { 1045 const char name[ETH_GSTRING_LEN]; 1046} batadv_counters_strings[] = { 1047 { "tx" }, 1048 { "tx_bytes" }, 1049 { "tx_dropped" }, 1050 { "rx" }, 1051 { "rx_bytes" }, 1052 { "forward" }, 1053 { "forward_bytes" }, 1054 { "mgmt_tx" }, 1055 { "mgmt_tx_bytes" }, 1056 { "mgmt_rx" }, 1057 { "mgmt_rx_bytes" }, 1058 { "frag_tx" }, 1059 { "frag_tx_bytes" }, 1060 { "frag_rx" }, 1061 { "frag_rx_bytes" }, 1062 { "frag_fwd" }, 1063 { "frag_fwd_bytes" }, 1064 { "tt_request_tx" }, 1065 { "tt_request_rx" }, 1066 { "tt_response_tx" }, 1067 { "tt_response_rx" }, 1068 { "tt_roam_adv_tx" }, 1069 { "tt_roam_adv_rx" }, 1070#ifdef CONFIG_BATMAN_ADV_DAT 1071 { "dat_get_tx" }, 1072 { "dat_get_rx" }, 1073 { "dat_put_tx" }, 1074 { "dat_put_rx" }, 1075 { "dat_cached_reply_tx" }, 1076#endif 1077#ifdef CONFIG_BATMAN_ADV_NC 1078 { "nc_code" }, 1079 { "nc_code_bytes" }, 1080 { "nc_recode" }, 1081 { "nc_recode_bytes" }, 1082 { "nc_buffer" }, 1083 { "nc_decode" }, 1084 { "nc_decode_bytes" }, 1085 { "nc_decode_failed" }, 1086 { "nc_sniffed" }, 1087#endif 1088}; 1089 1090static void batadv_get_strings(struct net_device *dev, uint32_t stringset, 1091 uint8_t *data) 1092{ 1093 if (stringset == ETH_SS_STATS) 1094 memcpy(data, batadv_counters_strings, 1095 sizeof(batadv_counters_strings)); 1096} 1097 1098static void batadv_get_ethtool_stats(struct net_device *dev, 1099 struct ethtool_stats *stats, 1100 uint64_t *data) 1101{ 1102 struct batadv_priv *bat_priv = netdev_priv(dev); 1103 int i; 1104 1105 for (i = 0; i < BATADV_CNT_NUM; i++) 1106 data[i] = batadv_sum_counter(bat_priv, i); 1107} 1108 1109static int batadv_get_sset_count(struct net_device *dev, int stringset) 1110{ 1111 if (stringset == ETH_SS_STATS) 1112 return BATADV_CNT_NUM; 1113 1114 return -EOPNOTSUPP; 1115} 1116