1 /* Copyright (C) 2007-2015 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 "soft-interface.h" 19 #include "main.h" 20 21 #include <linux/atomic.h> 22 #include <linux/byteorder/generic.h> 23 #include <linux/cache.h> 24 #include <linux/compiler.h> 25 #include <linux/errno.h> 26 #include <linux/etherdevice.h> 27 #include <linux/ethtool.h> 28 #include <linux/fs.h> 29 #include <linux/if_ether.h> 30 #include <linux/if_vlan.h> 31 #include <linux/jiffies.h> 32 #include <linux/kernel.h> 33 #include <linux/list.h> 34 #include <linux/lockdep.h> 35 #include <linux/netdevice.h> 36 #include <linux/percpu.h> 37 #include <linux/printk.h> 38 #include <linux/random.h> 39 #include <linux/rculist.h> 40 #include <linux/rcupdate.h> 41 #include <linux/skbuff.h> 42 #include <linux/slab.h> 43 #include <linux/socket.h> 44 #include <linux/spinlock.h> 45 #include <linux/stddef.h> 46 #include <linux/string.h> 47 #include <linux/types.h> 48 #include <linux/workqueue.h> 49 50 #include "bridge_loop_avoidance.h" 51 #include "debugfs.h" 52 #include "distributed-arp-table.h" 53 #include "gateway_client.h" 54 #include "gateway_common.h" 55 #include "hard-interface.h" 56 #include "multicast.h" 57 #include "network-coding.h" 58 #include "packet.h" 59 #include "send.h" 60 #include "sysfs.h" 61 #include "translation-table.h" 62 63 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); 64 static void batadv_get_drvinfo(struct net_device *dev, 65 struct ethtool_drvinfo *info); 66 static u32 batadv_get_msglevel(struct net_device *dev); 67 static void batadv_set_msglevel(struct net_device *dev, u32 value); 68 static u32 batadv_get_link(struct net_device *dev); 69 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data); 70 static void batadv_get_ethtool_stats(struct net_device *dev, 71 struct ethtool_stats *stats, u64 *data); 72 static int batadv_get_sset_count(struct net_device *dev, int stringset); 73 74 static const struct ethtool_ops batadv_ethtool_ops = { 75 .get_settings = batadv_get_settings, 76 .get_drvinfo = batadv_get_drvinfo, 77 .get_msglevel = batadv_get_msglevel, 78 .set_msglevel = batadv_set_msglevel, 79 .get_link = batadv_get_link, 80 .get_strings = batadv_get_strings, 81 .get_ethtool_stats = batadv_get_ethtool_stats, 82 .get_sset_count = batadv_get_sset_count, 83 }; 84 85 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) 86 { 87 int result; 88 89 /* TODO: We must check if we can release all references to non-payload 90 * data using skb_header_release in our skbs to allow skb_cow_header to 91 * work optimally. This means that those skbs are not allowed to read 92 * or write any data which is before the current position of skb->data 93 * after that call and thus allow other skbs with the same data buffer 94 * to write freely in that area. 95 */ 96 result = skb_cow_head(skb, len); 97 if (result < 0) 98 return result; 99 100 skb_push(skb, len); 101 return 0; 102 } 103 104 static int batadv_interface_open(struct net_device *dev) 105 { 106 netif_start_queue(dev); 107 return 0; 108 } 109 110 static int batadv_interface_release(struct net_device *dev) 111 { 112 netif_stop_queue(dev); 113 return 0; 114 } 115 116 static struct net_device_stats *batadv_interface_stats(struct net_device *dev) 117 { 118 struct batadv_priv *bat_priv = netdev_priv(dev); 119 struct net_device_stats *stats = &bat_priv->stats; 120 121 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); 122 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); 123 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); 124 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); 125 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); 126 return stats; 127 } 128 129 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) 130 { 131 struct batadv_priv *bat_priv = netdev_priv(dev); 132 struct batadv_softif_vlan *vlan; 133 struct sockaddr *addr = p; 134 uint8_t old_addr[ETH_ALEN]; 135 136 if (!is_valid_ether_addr(addr->sa_data)) 137 return -EADDRNOTAVAIL; 138 139 ether_addr_copy(old_addr, dev->dev_addr); 140 ether_addr_copy(dev->dev_addr, addr->sa_data); 141 142 /* only modify transtable if it has been initialized before */ 143 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 144 return 0; 145 146 rcu_read_lock(); 147 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 148 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, 149 "mac address changed", false); 150 batadv_tt_local_add(dev, addr->sa_data, vlan->vid, 151 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 152 } 153 rcu_read_unlock(); 154 155 return 0; 156 } 157 158 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 159 { 160 /* check ranges */ 161 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev))) 162 return -EINVAL; 163 164 dev->mtu = new_mtu; 165 166 return 0; 167 } 168 169 /** 170 * batadv_interface_set_rx_mode - set the rx mode of a device 171 * @dev: registered network device to modify 172 * 173 * We do not actually need to set any rx filters for the virtual batman 174 * soft interface. However a dummy handler enables a user to set static 175 * multicast listeners for instance. 176 */ 177 static void batadv_interface_set_rx_mode(struct net_device *dev) 178 { 179 } 180 181 static int batadv_interface_tx(struct sk_buff *skb, 182 struct net_device *soft_iface) 183 { 184 struct ethhdr *ethhdr; 185 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 186 struct batadv_hard_iface *primary_if = NULL; 187 struct batadv_bcast_packet *bcast_packet; 188 __be16 ethertype = htons(ETH_P_BATMAN); 189 static const uint8_t stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 190 0x00, 0x00}; 191 static const uint8_t ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 192 0x00, 0x00}; 193 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 194 uint8_t *dst_hint = NULL, chaddr[ETH_ALEN]; 195 struct vlan_ethhdr *vhdr; 196 unsigned int header_len = 0; 197 int data_len = skb->len, ret; 198 unsigned long brd_delay = 1; 199 bool do_bcast = false, client_added; 200 unsigned short vid; 201 uint32_t seqno; 202 int gw_mode; 203 enum batadv_forw_mode forw_mode; 204 struct batadv_orig_node *mcast_single_orig = NULL; 205 206 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 207 goto dropped; 208 209 soft_iface->trans_start = jiffies; 210 vid = batadv_get_vid(skb, 0); 211 ethhdr = eth_hdr(skb); 212 213 switch (ntohs(ethhdr->h_proto)) { 214 case ETH_P_8021Q: 215 vhdr = vlan_eth_hdr(skb); 216 217 if (vhdr->h_vlan_encapsulated_proto != ethertype) 218 break; 219 220 /* fall through */ 221 case ETH_P_BATMAN: 222 goto dropped; 223 } 224 225 if (batadv_bla_tx(bat_priv, skb, vid)) 226 goto dropped; 227 228 /* skb->data might have been reallocated by batadv_bla_tx() */ 229 ethhdr = eth_hdr(skb); 230 231 /* Register the client MAC in the transtable */ 232 if (!is_multicast_ether_addr(ethhdr->h_source)) { 233 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 234 vid, skb->skb_iif, 235 skb->mark); 236 if (!client_added) 237 goto dropped; 238 } 239 240 /* don't accept stp packets. STP does not help in meshes. 241 * better use the bridge loop avoidance ... 242 * 243 * The same goes for ECTP sent at least by some Cisco Switches, 244 * it might confuse the mesh when used with bridge loop avoidance. 245 */ 246 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 247 goto dropped; 248 249 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 250 goto dropped; 251 252 gw_mode = atomic_read(&bat_priv->gw_mode); 253 if (is_multicast_ether_addr(ethhdr->h_dest)) { 254 /* if gw mode is off, broadcast every packet */ 255 if (gw_mode == BATADV_GW_MODE_OFF) { 256 do_bcast = true; 257 goto send; 258 } 259 260 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 261 chaddr); 262 /* skb->data may have been modified by 263 * batadv_gw_dhcp_recipient_get() 264 */ 265 ethhdr = eth_hdr(skb); 266 /* if gw_mode is on, broadcast any non-DHCP message. 267 * All the DHCP packets are going to be sent as unicast 268 */ 269 if (dhcp_rcp == BATADV_DHCP_NO) { 270 do_bcast = true; 271 goto send; 272 } 273 274 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 275 dst_hint = chaddr; 276 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 277 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 278 /* gateways should not forward any DHCP message if 279 * directed to a DHCP server 280 */ 281 goto dropped; 282 283 send: 284 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 285 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 286 &mcast_single_orig); 287 if (forw_mode == BATADV_FORW_NONE) 288 goto dropped; 289 290 if (forw_mode == BATADV_FORW_SINGLE) 291 do_bcast = false; 292 } 293 } 294 295 batadv_skb_set_priority(skb, 0); 296 297 /* ethernet packet should be broadcasted */ 298 if (do_bcast) { 299 primary_if = batadv_primary_if_get_selected(bat_priv); 300 if (!primary_if) 301 goto dropped; 302 303 /* in case of ARP request, we do not immediately broadcasti the 304 * packet, instead we first wait for DAT to try to retrieve the 305 * correct ARP entry 306 */ 307 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 308 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 309 310 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 311 goto dropped; 312 313 bcast_packet = (struct batadv_bcast_packet *)skb->data; 314 bcast_packet->version = BATADV_COMPAT_VERSION; 315 bcast_packet->ttl = BATADV_TTL; 316 317 /* batman packet type: broadcast */ 318 bcast_packet->packet_type = BATADV_BCAST; 319 bcast_packet->reserved = 0; 320 321 /* hw address of first interface is the orig mac because only 322 * this mac is known throughout the mesh 323 */ 324 ether_addr_copy(bcast_packet->orig, 325 primary_if->net_dev->dev_addr); 326 327 /* set broadcast sequence number */ 328 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 329 bcast_packet->seqno = htonl(seqno); 330 331 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); 332 333 /* a copy is stored in the bcast list, therefore removing 334 * the original skb. 335 */ 336 kfree_skb(skb); 337 338 /* unicast packet */ 339 } else { 340 /* DHCP packets going to a server will use the GW feature */ 341 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 342 ret = batadv_gw_out_of_range(bat_priv, skb); 343 if (ret) 344 goto dropped; 345 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 346 } else if (mcast_single_orig) { 347 ret = batadv_send_skb_unicast(bat_priv, skb, 348 BATADV_UNICAST, 0, 349 mcast_single_orig, vid); 350 } else { 351 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 352 skb)) 353 goto dropped; 354 355 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 356 357 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 358 vid); 359 } 360 if (ret == NET_XMIT_DROP) 361 goto dropped_freed; 362 } 363 364 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 365 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 366 goto end; 367 368 dropped: 369 kfree_skb(skb); 370 dropped_freed: 371 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 372 end: 373 if (primary_if) 374 batadv_hardif_free_ref(primary_if); 375 return NETDEV_TX_OK; 376 } 377 378 void batadv_interface_rx(struct net_device *soft_iface, 379 struct sk_buff *skb, struct batadv_hard_iface *recv_if, 380 int hdr_size, struct batadv_orig_node *orig_node) 381 { 382 struct batadv_bcast_packet *batadv_bcast_packet; 383 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 384 __be16 ethertype = htons(ETH_P_BATMAN); 385 struct vlan_ethhdr *vhdr; 386 struct ethhdr *ethhdr; 387 unsigned short vid; 388 bool is_bcast; 389 390 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 391 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 392 393 /* check if enough space is available for pulling, and pull */ 394 if (!pskb_may_pull(skb, hdr_size)) 395 goto dropped; 396 397 skb_pull_rcsum(skb, hdr_size); 398 skb_reset_mac_header(skb); 399 400 /* clean the netfilter state now that the batman-adv header has been 401 * removed 402 */ 403 nf_reset(skb); 404 405 vid = batadv_get_vid(skb, 0); 406 ethhdr = eth_hdr(skb); 407 408 switch (ntohs(ethhdr->h_proto)) { 409 case ETH_P_8021Q: 410 vhdr = (struct vlan_ethhdr *)skb->data; 411 412 if (vhdr->h_vlan_encapsulated_proto != ethertype) 413 break; 414 415 /* fall through */ 416 case ETH_P_BATMAN: 417 goto dropped; 418 } 419 420 /* skb->dev & skb->pkt_type are set here */ 421 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 422 goto dropped; 423 skb->protocol = eth_type_trans(skb, soft_iface); 424 425 /* should not be necessary anymore as we use skb_pull_rcsum() 426 * TODO: please verify this and remove this TODO 427 * -- Dec 21st 2009, Simon Wunderlich 428 */ 429 430 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ 431 432 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 433 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 434 skb->len + ETH_HLEN); 435 436 soft_iface->last_rx = jiffies; 437 438 /* Let the bridge loop avoidance check the packet. If will 439 * not handle it, we can safely push it up. 440 */ 441 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 442 goto out; 443 444 if (orig_node) 445 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 446 ethhdr->h_source, vid); 447 448 if (is_multicast_ether_addr(ethhdr->h_dest)) { 449 /* set the mark on broadcast packets if AP isolation is ON and 450 * the packet is coming from an "isolated" client 451 */ 452 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 453 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 454 vid)) { 455 /* save bits in skb->mark not covered by the mask and 456 * apply the mark on the rest 457 */ 458 skb->mark &= ~bat_priv->isolation_mark_mask; 459 skb->mark |= bat_priv->isolation_mark; 460 } 461 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 462 ethhdr->h_dest, vid)) { 463 goto dropped; 464 } 465 466 netif_rx(skb); 467 goto out; 468 469 dropped: 470 kfree_skb(skb); 471 out: 472 return; 473 } 474 475 /** 476 * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and 477 * possibly free it 478 * @softif_vlan: the vlan object to release 479 */ 480 void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) 481 { 482 if (atomic_dec_and_test(&vlan->refcount)) { 483 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 484 hlist_del_rcu(&vlan->list); 485 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 486 487 kfree_rcu(vlan, rcu); 488 } 489 } 490 491 /** 492 * batadv_softif_vlan_get - get the vlan object for a specific vid 493 * @bat_priv: the bat priv with all the soft interface information 494 * @vid: the identifier of the vlan object to retrieve 495 * 496 * Returns the private data of the vlan matching the vid passed as argument or 497 * NULL otherwise. The refcounter of the returned object is incremented by 1. 498 */ 499 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 500 unsigned short vid) 501 { 502 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 503 504 rcu_read_lock(); 505 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 506 if (vlan_tmp->vid != vid) 507 continue; 508 509 if (!atomic_inc_not_zero(&vlan_tmp->refcount)) 510 continue; 511 512 vlan = vlan_tmp; 513 break; 514 } 515 rcu_read_unlock(); 516 517 return vlan; 518 } 519 520 /** 521 * batadv_create_vlan - allocate the needed resources for a new vlan 522 * @bat_priv: the bat priv with all the soft interface information 523 * @vid: the VLAN identifier 524 * 525 * Returns 0 on success, a negative error otherwise. 526 */ 527 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 528 { 529 struct batadv_softif_vlan *vlan; 530 int err; 531 532 vlan = batadv_softif_vlan_get(bat_priv, vid); 533 if (vlan) { 534 batadv_softif_vlan_free_ref(vlan); 535 return -EEXIST; 536 } 537 538 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 539 if (!vlan) 540 return -ENOMEM; 541 542 vlan->bat_priv = bat_priv; 543 vlan->vid = vid; 544 atomic_set(&vlan->refcount, 1); 545 546 atomic_set(&vlan->ap_isolation, 0); 547 548 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 549 if (err) { 550 kfree(vlan); 551 return err; 552 } 553 554 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 555 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 556 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 557 558 /* add a new TT local entry. This one will be marked with the NOPURGE 559 * flag 560 */ 561 batadv_tt_local_add(bat_priv->soft_iface, 562 bat_priv->soft_iface->dev_addr, vid, 563 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 564 565 return 0; 566 } 567 568 /** 569 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object 570 * @bat_priv: the bat priv with all the soft interface information 571 * @vlan: the object to remove 572 */ 573 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 574 struct batadv_softif_vlan *vlan) 575 { 576 /* explicitly remove the associated TT local entry because it is marked 577 * with the NOPURGE flag 578 */ 579 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 580 vlan->vid, "vlan interface destroyed", false); 581 582 batadv_sysfs_del_vlan(bat_priv, vlan); 583 batadv_softif_vlan_free_ref(vlan); 584 } 585 586 /** 587 * batadv_interface_add_vid - ndo_add_vid API implementation 588 * @dev: the netdev of the mesh interface 589 * @vid: identifier of the new vlan 590 * 591 * Set up all the internal structures for handling the new vlan on top of the 592 * mesh interface 593 * 594 * Returns 0 on success or a negative error code in case of failure. 595 */ 596 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 597 unsigned short vid) 598 { 599 struct batadv_priv *bat_priv = netdev_priv(dev); 600 struct batadv_softif_vlan *vlan; 601 int ret; 602 603 /* only 802.1Q vlans are supported. 604 * batman-adv does not know how to handle other types 605 */ 606 if (proto != htons(ETH_P_8021Q)) 607 return -EINVAL; 608 609 vid |= BATADV_VLAN_HAS_TAG; 610 611 /* if a new vlan is getting created and it already exists, it means that 612 * it was not deleted yet. batadv_softif_vlan_get() increases the 613 * refcount in order to revive the object. 614 * 615 * if it does not exist then create it. 616 */ 617 vlan = batadv_softif_vlan_get(bat_priv, vid); 618 if (!vlan) 619 return batadv_softif_create_vlan(bat_priv, vid); 620 621 /* recreate the sysfs object if it was already destroyed (and it should 622 * be since we received a kill_vid() for this vlan 623 */ 624 if (!vlan->kobj) { 625 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 626 if (ret) { 627 batadv_softif_vlan_free_ref(vlan); 628 return ret; 629 } 630 } 631 632 /* add a new TT local entry. This one will be marked with the NOPURGE 633 * flag. This must be added again, even if the vlan object already 634 * exists, because the entry was deleted by kill_vid() 635 */ 636 batadv_tt_local_add(bat_priv->soft_iface, 637 bat_priv->soft_iface->dev_addr, vid, 638 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 639 640 return 0; 641 } 642 643 /** 644 * batadv_interface_kill_vid - ndo_kill_vid API implementation 645 * @dev: the netdev of the mesh interface 646 * @vid: identifier of the deleted vlan 647 * 648 * Destroy all the internal structures used to handle the vlan identified by vid 649 * on top of the mesh interface 650 * 651 * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 652 * or -ENOENT if the specified vlan id wasn't registered. 653 */ 654 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 655 unsigned short vid) 656 { 657 struct batadv_priv *bat_priv = netdev_priv(dev); 658 struct batadv_softif_vlan *vlan; 659 660 /* only 802.1Q vlans are supported. batman-adv does not know how to 661 * handle other types 662 */ 663 if (proto != htons(ETH_P_8021Q)) 664 return -EINVAL; 665 666 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 667 if (!vlan) 668 return -ENOENT; 669 670 batadv_softif_destroy_vlan(bat_priv, vlan); 671 672 /* finally free the vlan object */ 673 batadv_softif_vlan_free_ref(vlan); 674 675 return 0; 676 } 677 678 /* batman-adv network devices have devices nesting below it and are a special 679 * "super class" of normal network devices; split their locks off into a 680 * separate class since they always nest. 681 */ 682 static struct lock_class_key batadv_netdev_xmit_lock_key; 683 static struct lock_class_key batadv_netdev_addr_lock_key; 684 685 /** 686 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue 687 * @dev: device which owns the tx queue 688 * @txq: tx queue to modify 689 * @_unused: always NULL 690 */ 691 static void batadv_set_lockdep_class_one(struct net_device *dev, 692 struct netdev_queue *txq, 693 void *_unused) 694 { 695 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 696 } 697 698 /** 699 * batadv_set_lockdep_class - Set txq and addr_list lockdep class 700 * @dev: network device to modify 701 */ 702 static void batadv_set_lockdep_class(struct net_device *dev) 703 { 704 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 705 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 706 } 707 708 /** 709 * batadv_softif_destroy_finish - cleans up the remains of a softif 710 * @work: work queue item 711 * 712 * Free the parts of the soft interface which can not be removed under 713 * rtnl lock (to prevent deadlock situations). 714 */ 715 static void batadv_softif_destroy_finish(struct work_struct *work) 716 { 717 struct batadv_softif_vlan *vlan; 718 struct batadv_priv *bat_priv; 719 struct net_device *soft_iface; 720 721 bat_priv = container_of(work, struct batadv_priv, 722 cleanup_work); 723 soft_iface = bat_priv->soft_iface; 724 725 /* destroy the "untagged" VLAN */ 726 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 727 if (vlan) { 728 batadv_softif_destroy_vlan(bat_priv, vlan); 729 batadv_softif_vlan_free_ref(vlan); 730 } 731 732 batadv_sysfs_del_meshif(soft_iface); 733 unregister_netdev(soft_iface); 734 } 735 736 /** 737 * batadv_softif_init_late - late stage initialization of soft interface 738 * @dev: registered network device to modify 739 * 740 * Returns error code on failures 741 */ 742 static int batadv_softif_init_late(struct net_device *dev) 743 { 744 struct batadv_priv *bat_priv; 745 uint32_t random_seqno; 746 int ret; 747 size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM; 748 749 batadv_set_lockdep_class(dev); 750 751 bat_priv = netdev_priv(dev); 752 bat_priv->soft_iface = dev; 753 INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish); 754 755 /* batadv_interface_stats() needs to be available as soon as 756 * register_netdevice() has been called 757 */ 758 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t)); 759 if (!bat_priv->bat_counters) 760 return -ENOMEM; 761 762 atomic_set(&bat_priv->aggregated_ogms, 1); 763 atomic_set(&bat_priv->bonding, 0); 764 #ifdef CONFIG_BATMAN_ADV_BLA 765 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 766 #endif 767 #ifdef CONFIG_BATMAN_ADV_DAT 768 atomic_set(&bat_priv->distributed_arp_table, 1); 769 #endif 770 #ifdef CONFIG_BATMAN_ADV_MCAST 771 bat_priv->mcast.flags = BATADV_NO_FLAGS; 772 atomic_set(&bat_priv->multicast_mode, 1); 773 atomic_set(&bat_priv->mcast.num_disabled, 0); 774 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 775 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 776 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 777 #endif 778 atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF); 779 atomic_set(&bat_priv->gw_sel_class, 20); 780 atomic_set(&bat_priv->gw.bandwidth_down, 100); 781 atomic_set(&bat_priv->gw.bandwidth_up, 20); 782 atomic_set(&bat_priv->orig_interval, 1000); 783 atomic_set(&bat_priv->hop_penalty, 30); 784 #ifdef CONFIG_BATMAN_ADV_DEBUG 785 atomic_set(&bat_priv->log_level, 0); 786 #endif 787 atomic_set(&bat_priv->fragmentation, 1); 788 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 789 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 790 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 791 792 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 793 atomic_set(&bat_priv->bcast_seqno, 1); 794 atomic_set(&bat_priv->tt.vn, 0); 795 atomic_set(&bat_priv->tt.local_changes, 0); 796 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 797 #ifdef CONFIG_BATMAN_ADV_BLA 798 atomic_set(&bat_priv->bla.num_requests, 0); 799 #endif 800 bat_priv->tt.last_changeset = NULL; 801 bat_priv->tt.last_changeset_len = 0; 802 bat_priv->isolation_mark = 0; 803 bat_priv->isolation_mark_mask = 0; 804 805 /* randomize initial seqno to avoid collision */ 806 get_random_bytes(&random_seqno, sizeof(random_seqno)); 807 atomic_set(&bat_priv->frag_seqno, random_seqno); 808 809 bat_priv->primary_if = NULL; 810 bat_priv->num_ifaces = 0; 811 812 batadv_nc_init_bat_priv(bat_priv); 813 814 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 815 if (ret < 0) 816 goto free_bat_counters; 817 818 ret = batadv_debugfs_add_meshif(dev); 819 if (ret < 0) 820 goto free_bat_counters; 821 822 ret = batadv_mesh_init(dev); 823 if (ret < 0) 824 goto unreg_debugfs; 825 826 return 0; 827 828 unreg_debugfs: 829 batadv_debugfs_del_meshif(dev); 830 free_bat_counters: 831 free_percpu(bat_priv->bat_counters); 832 bat_priv->bat_counters = NULL; 833 834 return ret; 835 } 836 837 /** 838 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface 839 * @dev: batadv_soft_interface used as master interface 840 * @slave_dev: net_device which should become the slave interface 841 * 842 * Return 0 if successful or error otherwise. 843 */ 844 static int batadv_softif_slave_add(struct net_device *dev, 845 struct net_device *slave_dev) 846 { 847 struct batadv_hard_iface *hard_iface; 848 int ret = -EINVAL; 849 850 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 851 if (!hard_iface || hard_iface->soft_iface) 852 goto out; 853 854 ret = batadv_hardif_enable_interface(hard_iface, dev->name); 855 856 out: 857 if (hard_iface) 858 batadv_hardif_free_ref(hard_iface); 859 return ret; 860 } 861 862 /** 863 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface 864 * @dev: batadv_soft_interface used as master interface 865 * @slave_dev: net_device which should be removed from the master interface 866 * 867 * Return 0 if successful or error otherwise. 868 */ 869 static int batadv_softif_slave_del(struct net_device *dev, 870 struct net_device *slave_dev) 871 { 872 struct batadv_hard_iface *hard_iface; 873 int ret = -EINVAL; 874 875 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 876 877 if (!hard_iface || hard_iface->soft_iface != dev) 878 goto out; 879 880 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 881 ret = 0; 882 883 out: 884 if (hard_iface) 885 batadv_hardif_free_ref(hard_iface); 886 return ret; 887 } 888 889 static const struct net_device_ops batadv_netdev_ops = { 890 .ndo_init = batadv_softif_init_late, 891 .ndo_open = batadv_interface_open, 892 .ndo_stop = batadv_interface_release, 893 .ndo_get_stats = batadv_interface_stats, 894 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 895 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 896 .ndo_set_mac_address = batadv_interface_set_mac_addr, 897 .ndo_change_mtu = batadv_interface_change_mtu, 898 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 899 .ndo_start_xmit = batadv_interface_tx, 900 .ndo_validate_addr = eth_validate_addr, 901 .ndo_add_slave = batadv_softif_slave_add, 902 .ndo_del_slave = batadv_softif_slave_del, 903 }; 904 905 /** 906 * batadv_softif_free - Deconstructor of batadv_soft_interface 907 * @dev: Device to cleanup and remove 908 */ 909 static void batadv_softif_free(struct net_device *dev) 910 { 911 batadv_debugfs_del_meshif(dev); 912 batadv_mesh_free(dev); 913 914 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 915 * their tasks. Wait for them all to be finished before freeing the 916 * netdev and its private data (bat_priv) 917 */ 918 rcu_barrier(); 919 920 free_netdev(dev); 921 } 922 923 /** 924 * batadv_softif_init_early - early stage initialization of soft interface 925 * @dev: registered network device to modify 926 */ 927 static void batadv_softif_init_early(struct net_device *dev) 928 { 929 struct batadv_priv *priv = netdev_priv(dev); 930 931 ether_setup(dev); 932 933 dev->netdev_ops = &batadv_netdev_ops; 934 dev->destructor = batadv_softif_free; 935 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 936 dev->tx_queue_len = 0; 937 938 /* can't call min_mtu, because the needed variables 939 * have not been initialized yet 940 */ 941 dev->mtu = ETH_DATA_LEN; 942 /* reserve more space in the skbuff for our header */ 943 dev->hard_header_len = batadv_max_header_len(); 944 945 /* generate random address */ 946 eth_hw_addr_random(dev); 947 948 dev->ethtool_ops = &batadv_ethtool_ops; 949 950 memset(priv, 0, sizeof(*priv)); 951 } 952 953 struct net_device *batadv_softif_create(const char *name) 954 { 955 struct net_device *soft_iface; 956 int ret; 957 958 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 959 NET_NAME_UNKNOWN, batadv_softif_init_early); 960 if (!soft_iface) 961 return NULL; 962 963 soft_iface->rtnl_link_ops = &batadv_link_ops; 964 965 ret = register_netdevice(soft_iface); 966 if (ret < 0) { 967 pr_err("Unable to register the batman interface '%s': %i\n", 968 name, ret); 969 free_netdev(soft_iface); 970 return NULL; 971 } 972 973 return soft_iface; 974 } 975 976 /** 977 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs 978 * @soft_iface: the to-be-removed batman-adv interface 979 */ 980 void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 981 { 982 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 983 984 queue_work(batadv_event_workqueue, &bat_priv->cleanup_work); 985 } 986 987 /** 988 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink 989 * @soft_iface: the to-be-removed batman-adv interface 990 * @head: list pointer 991 */ 992 static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 993 struct list_head *head) 994 { 995 struct batadv_hard_iface *hard_iface; 996 997 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 998 if (hard_iface->soft_iface == soft_iface) 999 batadv_hardif_disable_interface(hard_iface, 1000 BATADV_IF_CLEANUP_KEEP); 1001 } 1002 1003 batadv_sysfs_del_meshif(soft_iface); 1004 unregister_netdevice_queue(soft_iface, head); 1005 } 1006 1007 int batadv_softif_is_valid(const struct net_device *net_dev) 1008 { 1009 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1010 return 1; 1011 1012 return 0; 1013 } 1014 1015 struct rtnl_link_ops batadv_link_ops __read_mostly = { 1016 .kind = "batadv", 1017 .priv_size = sizeof(struct batadv_priv), 1018 .setup = batadv_softif_init_early, 1019 .dellink = batadv_softif_destroy_netlink, 1020 }; 1021 1022 /* ethtool */ 1023 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1024 { 1025 cmd->supported = 0; 1026 cmd->advertising = 0; 1027 ethtool_cmd_speed_set(cmd, SPEED_10); 1028 cmd->duplex = DUPLEX_FULL; 1029 cmd->port = PORT_TP; 1030 cmd->phy_address = 0; 1031 cmd->transceiver = XCVR_INTERNAL; 1032 cmd->autoneg = AUTONEG_DISABLE; 1033 cmd->maxtxpkt = 0; 1034 cmd->maxrxpkt = 0; 1035 1036 return 0; 1037 } 1038 1039 static void batadv_get_drvinfo(struct net_device *dev, 1040 struct ethtool_drvinfo *info) 1041 { 1042 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 1043 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 1044 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 1045 strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); 1046 } 1047 1048 static u32 batadv_get_msglevel(struct net_device *dev) 1049 { 1050 return -EOPNOTSUPP; 1051 } 1052 1053 static void batadv_set_msglevel(struct net_device *dev, u32 value) 1054 { 1055 } 1056 1057 static u32 batadv_get_link(struct net_device *dev) 1058 { 1059 return 1; 1060 } 1061 1062 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 1063 * Declare each description string in struct.name[] to get fixed sized buffer 1064 * and compile time checking for strings longer than ETH_GSTRING_LEN. 1065 */ 1066 static const struct { 1067 const char name[ETH_GSTRING_LEN]; 1068 } batadv_counters_strings[] = { 1069 { "tx" }, 1070 { "tx_bytes" }, 1071 { "tx_dropped" }, 1072 { "rx" }, 1073 { "rx_bytes" }, 1074 { "forward" }, 1075 { "forward_bytes" }, 1076 { "mgmt_tx" }, 1077 { "mgmt_tx_bytes" }, 1078 { "mgmt_rx" }, 1079 { "mgmt_rx_bytes" }, 1080 { "frag_tx" }, 1081 { "frag_tx_bytes" }, 1082 { "frag_rx" }, 1083 { "frag_rx_bytes" }, 1084 { "frag_fwd" }, 1085 { "frag_fwd_bytes" }, 1086 { "tt_request_tx" }, 1087 { "tt_request_rx" }, 1088 { "tt_response_tx" }, 1089 { "tt_response_rx" }, 1090 { "tt_roam_adv_tx" }, 1091 { "tt_roam_adv_rx" }, 1092 #ifdef CONFIG_BATMAN_ADV_DAT 1093 { "dat_get_tx" }, 1094 { "dat_get_rx" }, 1095 { "dat_put_tx" }, 1096 { "dat_put_rx" }, 1097 { "dat_cached_reply_tx" }, 1098 #endif 1099 #ifdef CONFIG_BATMAN_ADV_NC 1100 { "nc_code" }, 1101 { "nc_code_bytes" }, 1102 { "nc_recode" }, 1103 { "nc_recode_bytes" }, 1104 { "nc_buffer" }, 1105 { "nc_decode" }, 1106 { "nc_decode_bytes" }, 1107 { "nc_decode_failed" }, 1108 { "nc_sniffed" }, 1109 #endif 1110 }; 1111 1112 static void batadv_get_strings(struct net_device *dev, uint32_t stringset, 1113 uint8_t *data) 1114 { 1115 if (stringset == ETH_SS_STATS) 1116 memcpy(data, batadv_counters_strings, 1117 sizeof(batadv_counters_strings)); 1118 } 1119 1120 static void batadv_get_ethtool_stats(struct net_device *dev, 1121 struct ethtool_stats *stats, 1122 uint64_t *data) 1123 { 1124 struct batadv_priv *bat_priv = netdev_priv(dev); 1125 int i; 1126 1127 for (i = 0; i < BATADV_CNT_NUM; i++) 1128 data[i] = batadv_sum_counter(bat_priv, i); 1129 } 1130 1131 static int batadv_get_sset_count(struct net_device *dev, int stringset) 1132 { 1133 if (stringset == ETH_SS_STATS) 1134 return BATADV_CNT_NUM; 1135 1136 return -EOPNOTSUPP; 1137 } 1138