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 u8 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 u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 190 0x00, 0x00}; 191 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 192 0x00, 0x00}; 193 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 194 u8 *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 u32 seqno; 202 int gw_mode; 203 enum batadv_forw_mode forw_mode; 204 struct batadv_orig_node *mcast_single_orig = NULL; 205 int network_offset = ETH_HLEN; 206 207 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 208 goto dropped; 209 210 soft_iface->trans_start = jiffies; 211 vid = batadv_get_vid(skb, 0); 212 ethhdr = eth_hdr(skb); 213 214 switch (ntohs(ethhdr->h_proto)) { 215 case ETH_P_8021Q: 216 vhdr = vlan_eth_hdr(skb); 217 218 if (vhdr->h_vlan_encapsulated_proto != ethertype) { 219 network_offset += VLAN_HLEN; 220 break; 221 } 222 223 /* fall through */ 224 case ETH_P_BATMAN: 225 goto dropped; 226 } 227 228 skb_set_network_header(skb, network_offset); 229 230 if (batadv_bla_tx(bat_priv, skb, vid)) 231 goto dropped; 232 233 /* skb->data might have been reallocated by batadv_bla_tx() */ 234 ethhdr = eth_hdr(skb); 235 236 /* Register the client MAC in the transtable */ 237 if (!is_multicast_ether_addr(ethhdr->h_source)) { 238 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 239 vid, skb->skb_iif, 240 skb->mark); 241 if (!client_added) 242 goto dropped; 243 } 244 245 /* don't accept stp packets. STP does not help in meshes. 246 * better use the bridge loop avoidance ... 247 * 248 * The same goes for ECTP sent at least by some Cisco Switches, 249 * it might confuse the mesh when used with bridge loop avoidance. 250 */ 251 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 252 goto dropped; 253 254 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 255 goto dropped; 256 257 gw_mode = atomic_read(&bat_priv->gw_mode); 258 if (is_multicast_ether_addr(ethhdr->h_dest)) { 259 /* if gw mode is off, broadcast every packet */ 260 if (gw_mode == BATADV_GW_MODE_OFF) { 261 do_bcast = true; 262 goto send; 263 } 264 265 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 266 chaddr); 267 /* skb->data may have been modified by 268 * batadv_gw_dhcp_recipient_get() 269 */ 270 ethhdr = eth_hdr(skb); 271 /* if gw_mode is on, broadcast any non-DHCP message. 272 * All the DHCP packets are going to be sent as unicast 273 */ 274 if (dhcp_rcp == BATADV_DHCP_NO) { 275 do_bcast = true; 276 goto send; 277 } 278 279 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 280 dst_hint = chaddr; 281 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 282 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 283 /* gateways should not forward any DHCP message if 284 * directed to a DHCP server 285 */ 286 goto dropped; 287 288 send: 289 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 290 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 291 &mcast_single_orig); 292 if (forw_mode == BATADV_FORW_NONE) 293 goto dropped; 294 295 if (forw_mode == BATADV_FORW_SINGLE) 296 do_bcast = false; 297 } 298 } 299 300 batadv_skb_set_priority(skb, 0); 301 302 /* ethernet packet should be broadcasted */ 303 if (do_bcast) { 304 primary_if = batadv_primary_if_get_selected(bat_priv); 305 if (!primary_if) 306 goto dropped; 307 308 /* in case of ARP request, we do not immediately broadcasti the 309 * packet, instead we first wait for DAT to try to retrieve the 310 * correct ARP entry 311 */ 312 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 313 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 314 315 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 316 goto dropped; 317 318 bcast_packet = (struct batadv_bcast_packet *)skb->data; 319 bcast_packet->version = BATADV_COMPAT_VERSION; 320 bcast_packet->ttl = BATADV_TTL; 321 322 /* batman packet type: broadcast */ 323 bcast_packet->packet_type = BATADV_BCAST; 324 bcast_packet->reserved = 0; 325 326 /* hw address of first interface is the orig mac because only 327 * this mac is known throughout the mesh 328 */ 329 ether_addr_copy(bcast_packet->orig, 330 primary_if->net_dev->dev_addr); 331 332 /* set broadcast sequence number */ 333 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 334 bcast_packet->seqno = htonl(seqno); 335 336 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); 337 338 /* a copy is stored in the bcast list, therefore removing 339 * the original skb. 340 */ 341 kfree_skb(skb); 342 343 /* unicast packet */ 344 } else { 345 /* DHCP packets going to a server will use the GW feature */ 346 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 347 ret = batadv_gw_out_of_range(bat_priv, skb); 348 if (ret) 349 goto dropped; 350 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 351 } else if (mcast_single_orig) { 352 ret = batadv_send_skb_unicast(bat_priv, skb, 353 BATADV_UNICAST, 0, 354 mcast_single_orig, vid); 355 } else { 356 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 357 skb)) 358 goto dropped; 359 360 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 361 362 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 363 vid); 364 } 365 if (ret == NET_XMIT_DROP) 366 goto dropped_freed; 367 } 368 369 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 370 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 371 goto end; 372 373 dropped: 374 kfree_skb(skb); 375 dropped_freed: 376 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 377 end: 378 if (primary_if) 379 batadv_hardif_free_ref(primary_if); 380 return NETDEV_TX_OK; 381 } 382 383 void batadv_interface_rx(struct net_device *soft_iface, 384 struct sk_buff *skb, struct batadv_hard_iface *recv_if, 385 int hdr_size, struct batadv_orig_node *orig_node) 386 { 387 struct batadv_bcast_packet *batadv_bcast_packet; 388 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 389 __be16 ethertype = htons(ETH_P_BATMAN); 390 struct vlan_ethhdr *vhdr; 391 struct ethhdr *ethhdr; 392 unsigned short vid; 393 bool is_bcast; 394 395 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 396 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 397 398 /* check if enough space is available for pulling, and pull */ 399 if (!pskb_may_pull(skb, hdr_size)) 400 goto dropped; 401 402 skb_pull_rcsum(skb, hdr_size); 403 skb_reset_mac_header(skb); 404 405 /* clean the netfilter state now that the batman-adv header has been 406 * removed 407 */ 408 nf_reset(skb); 409 410 vid = batadv_get_vid(skb, 0); 411 ethhdr = eth_hdr(skb); 412 413 switch (ntohs(ethhdr->h_proto)) { 414 case ETH_P_8021Q: 415 vhdr = (struct vlan_ethhdr *)skb->data; 416 417 if (vhdr->h_vlan_encapsulated_proto != ethertype) 418 break; 419 420 /* fall through */ 421 case ETH_P_BATMAN: 422 goto dropped; 423 } 424 425 /* skb->dev & skb->pkt_type are set here */ 426 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 427 goto dropped; 428 skb->protocol = eth_type_trans(skb, soft_iface); 429 430 /* should not be necessary anymore as we use skb_pull_rcsum() 431 * TODO: please verify this and remove this TODO 432 * -- Dec 21st 2009, Simon Wunderlich 433 */ 434 435 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ 436 437 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 438 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 439 skb->len + ETH_HLEN); 440 441 soft_iface->last_rx = jiffies; 442 443 /* Let the bridge loop avoidance check the packet. If will 444 * not handle it, we can safely push it up. 445 */ 446 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 447 goto out; 448 449 if (orig_node) 450 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 451 ethhdr->h_source, vid); 452 453 if (is_multicast_ether_addr(ethhdr->h_dest)) { 454 /* set the mark on broadcast packets if AP isolation is ON and 455 * the packet is coming from an "isolated" client 456 */ 457 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 458 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 459 vid)) { 460 /* save bits in skb->mark not covered by the mask and 461 * apply the mark on the rest 462 */ 463 skb->mark &= ~bat_priv->isolation_mark_mask; 464 skb->mark |= bat_priv->isolation_mark; 465 } 466 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 467 ethhdr->h_dest, vid)) { 468 goto dropped; 469 } 470 471 netif_rx(skb); 472 goto out; 473 474 dropped: 475 kfree_skb(skb); 476 out: 477 return; 478 } 479 480 /** 481 * batadv_softif_vlan_free_ref - decrease the vlan object refcounter and 482 * possibly free it 483 * @softif_vlan: the vlan object to release 484 */ 485 void batadv_softif_vlan_free_ref(struct batadv_softif_vlan *vlan) 486 { 487 if (!vlan) 488 return; 489 490 if (atomic_dec_and_test(&vlan->refcount)) { 491 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 492 hlist_del_rcu(&vlan->list); 493 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 494 495 kfree_rcu(vlan, rcu); 496 } 497 } 498 499 /** 500 * batadv_softif_vlan_get - get the vlan object for a specific vid 501 * @bat_priv: the bat priv with all the soft interface information 502 * @vid: the identifier of the vlan object to retrieve 503 * 504 * Returns the private data of the vlan matching the vid passed as argument or 505 * NULL otherwise. The refcounter of the returned object is incremented by 1. 506 */ 507 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 508 unsigned short vid) 509 { 510 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 511 512 rcu_read_lock(); 513 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 514 if (vlan_tmp->vid != vid) 515 continue; 516 517 if (!atomic_inc_not_zero(&vlan_tmp->refcount)) 518 continue; 519 520 vlan = vlan_tmp; 521 break; 522 } 523 rcu_read_unlock(); 524 525 return vlan; 526 } 527 528 /** 529 * batadv_create_vlan - allocate the needed resources for a new vlan 530 * @bat_priv: the bat priv with all the soft interface information 531 * @vid: the VLAN identifier 532 * 533 * Returns 0 on success, a negative error otherwise. 534 */ 535 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 536 { 537 struct batadv_softif_vlan *vlan; 538 int err; 539 540 vlan = batadv_softif_vlan_get(bat_priv, vid); 541 if (vlan) { 542 batadv_softif_vlan_free_ref(vlan); 543 return -EEXIST; 544 } 545 546 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 547 if (!vlan) 548 return -ENOMEM; 549 550 vlan->bat_priv = bat_priv; 551 vlan->vid = vid; 552 atomic_set(&vlan->refcount, 1); 553 554 atomic_set(&vlan->ap_isolation, 0); 555 556 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 557 if (err) { 558 kfree(vlan); 559 return err; 560 } 561 562 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 563 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 564 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 565 566 /* add a new TT local entry. This one will be marked with the NOPURGE 567 * flag 568 */ 569 batadv_tt_local_add(bat_priv->soft_iface, 570 bat_priv->soft_iface->dev_addr, vid, 571 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 572 573 return 0; 574 } 575 576 /** 577 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object 578 * @bat_priv: the bat priv with all the soft interface information 579 * @vlan: the object to remove 580 */ 581 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 582 struct batadv_softif_vlan *vlan) 583 { 584 /* explicitly remove the associated TT local entry because it is marked 585 * with the NOPURGE flag 586 */ 587 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 588 vlan->vid, "vlan interface destroyed", false); 589 590 batadv_sysfs_del_vlan(bat_priv, vlan); 591 batadv_softif_vlan_free_ref(vlan); 592 } 593 594 /** 595 * batadv_interface_add_vid - ndo_add_vid API implementation 596 * @dev: the netdev of the mesh interface 597 * @vid: identifier of the new vlan 598 * 599 * Set up all the internal structures for handling the new vlan on top of the 600 * mesh interface 601 * 602 * Returns 0 on success or a negative error code in case of failure. 603 */ 604 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 605 unsigned short vid) 606 { 607 struct batadv_priv *bat_priv = netdev_priv(dev); 608 struct batadv_softif_vlan *vlan; 609 int ret; 610 611 /* only 802.1Q vlans are supported. 612 * batman-adv does not know how to handle other types 613 */ 614 if (proto != htons(ETH_P_8021Q)) 615 return -EINVAL; 616 617 vid |= BATADV_VLAN_HAS_TAG; 618 619 /* if a new vlan is getting created and it already exists, it means that 620 * it was not deleted yet. batadv_softif_vlan_get() increases the 621 * refcount in order to revive the object. 622 * 623 * if it does not exist then create it. 624 */ 625 vlan = batadv_softif_vlan_get(bat_priv, vid); 626 if (!vlan) 627 return batadv_softif_create_vlan(bat_priv, vid); 628 629 /* recreate the sysfs object if it was already destroyed (and it should 630 * be since we received a kill_vid() for this vlan 631 */ 632 if (!vlan->kobj) { 633 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 634 if (ret) { 635 batadv_softif_vlan_free_ref(vlan); 636 return ret; 637 } 638 } 639 640 /* add a new TT local entry. This one will be marked with the NOPURGE 641 * flag. This must be added again, even if the vlan object already 642 * exists, because the entry was deleted by kill_vid() 643 */ 644 batadv_tt_local_add(bat_priv->soft_iface, 645 bat_priv->soft_iface->dev_addr, vid, 646 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 647 648 return 0; 649 } 650 651 /** 652 * batadv_interface_kill_vid - ndo_kill_vid API implementation 653 * @dev: the netdev of the mesh interface 654 * @vid: identifier of the deleted vlan 655 * 656 * Destroy all the internal structures used to handle the vlan identified by vid 657 * on top of the mesh interface 658 * 659 * Returns 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 660 * or -ENOENT if the specified vlan id wasn't registered. 661 */ 662 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 663 unsigned short vid) 664 { 665 struct batadv_priv *bat_priv = netdev_priv(dev); 666 struct batadv_softif_vlan *vlan; 667 668 /* only 802.1Q vlans are supported. batman-adv does not know how to 669 * handle other types 670 */ 671 if (proto != htons(ETH_P_8021Q)) 672 return -EINVAL; 673 674 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 675 if (!vlan) 676 return -ENOENT; 677 678 batadv_softif_destroy_vlan(bat_priv, vlan); 679 680 /* finally free the vlan object */ 681 batadv_softif_vlan_free_ref(vlan); 682 683 return 0; 684 } 685 686 /* batman-adv network devices have devices nesting below it and are a special 687 * "super class" of normal network devices; split their locks off into a 688 * separate class since they always nest. 689 */ 690 static struct lock_class_key batadv_netdev_xmit_lock_key; 691 static struct lock_class_key batadv_netdev_addr_lock_key; 692 693 /** 694 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue 695 * @dev: device which owns the tx queue 696 * @txq: tx queue to modify 697 * @_unused: always NULL 698 */ 699 static void batadv_set_lockdep_class_one(struct net_device *dev, 700 struct netdev_queue *txq, 701 void *_unused) 702 { 703 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 704 } 705 706 /** 707 * batadv_set_lockdep_class - Set txq and addr_list lockdep class 708 * @dev: network device to modify 709 */ 710 static void batadv_set_lockdep_class(struct net_device *dev) 711 { 712 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 713 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 714 } 715 716 /** 717 * batadv_softif_destroy_finish - cleans up the remains of a softif 718 * @work: work queue item 719 * 720 * Free the parts of the soft interface which can not be removed under 721 * rtnl lock (to prevent deadlock situations). 722 */ 723 static void batadv_softif_destroy_finish(struct work_struct *work) 724 { 725 struct batadv_softif_vlan *vlan; 726 struct batadv_priv *bat_priv; 727 struct net_device *soft_iface; 728 729 bat_priv = container_of(work, struct batadv_priv, 730 cleanup_work); 731 soft_iface = bat_priv->soft_iface; 732 733 /* destroy the "untagged" VLAN */ 734 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 735 if (vlan) { 736 batadv_softif_destroy_vlan(bat_priv, vlan); 737 batadv_softif_vlan_free_ref(vlan); 738 } 739 740 batadv_sysfs_del_meshif(soft_iface); 741 unregister_netdev(soft_iface); 742 } 743 744 /** 745 * batadv_softif_init_late - late stage initialization of soft interface 746 * @dev: registered network device to modify 747 * 748 * Returns error code on failures 749 */ 750 static int batadv_softif_init_late(struct net_device *dev) 751 { 752 struct batadv_priv *bat_priv; 753 u32 random_seqno; 754 int ret; 755 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 756 757 batadv_set_lockdep_class(dev); 758 759 bat_priv = netdev_priv(dev); 760 bat_priv->soft_iface = dev; 761 INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish); 762 763 /* batadv_interface_stats() needs to be available as soon as 764 * register_netdevice() has been called 765 */ 766 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 767 if (!bat_priv->bat_counters) 768 return -ENOMEM; 769 770 atomic_set(&bat_priv->aggregated_ogms, 1); 771 atomic_set(&bat_priv->bonding, 0); 772 #ifdef CONFIG_BATMAN_ADV_BLA 773 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 774 #endif 775 #ifdef CONFIG_BATMAN_ADV_DAT 776 atomic_set(&bat_priv->distributed_arp_table, 1); 777 #endif 778 #ifdef CONFIG_BATMAN_ADV_MCAST 779 bat_priv->mcast.flags = BATADV_NO_FLAGS; 780 atomic_set(&bat_priv->multicast_mode, 1); 781 atomic_set(&bat_priv->mcast.num_disabled, 0); 782 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 783 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 784 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 785 #endif 786 atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF); 787 atomic_set(&bat_priv->gw_sel_class, 20); 788 atomic_set(&bat_priv->gw.bandwidth_down, 100); 789 atomic_set(&bat_priv->gw.bandwidth_up, 20); 790 atomic_set(&bat_priv->orig_interval, 1000); 791 atomic_set(&bat_priv->hop_penalty, 30); 792 #ifdef CONFIG_BATMAN_ADV_DEBUG 793 atomic_set(&bat_priv->log_level, 0); 794 #endif 795 atomic_set(&bat_priv->fragmentation, 1); 796 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 797 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 798 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 799 800 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 801 atomic_set(&bat_priv->bcast_seqno, 1); 802 atomic_set(&bat_priv->tt.vn, 0); 803 atomic_set(&bat_priv->tt.local_changes, 0); 804 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 805 #ifdef CONFIG_BATMAN_ADV_BLA 806 atomic_set(&bat_priv->bla.num_requests, 0); 807 #endif 808 bat_priv->tt.last_changeset = NULL; 809 bat_priv->tt.last_changeset_len = 0; 810 bat_priv->isolation_mark = 0; 811 bat_priv->isolation_mark_mask = 0; 812 813 /* randomize initial seqno to avoid collision */ 814 get_random_bytes(&random_seqno, sizeof(random_seqno)); 815 atomic_set(&bat_priv->frag_seqno, random_seqno); 816 817 bat_priv->primary_if = NULL; 818 bat_priv->num_ifaces = 0; 819 820 batadv_nc_init_bat_priv(bat_priv); 821 822 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 823 if (ret < 0) 824 goto free_bat_counters; 825 826 ret = batadv_debugfs_add_meshif(dev); 827 if (ret < 0) 828 goto free_bat_counters; 829 830 ret = batadv_mesh_init(dev); 831 if (ret < 0) 832 goto unreg_debugfs; 833 834 return 0; 835 836 unreg_debugfs: 837 batadv_debugfs_del_meshif(dev); 838 free_bat_counters: 839 free_percpu(bat_priv->bat_counters); 840 bat_priv->bat_counters = NULL; 841 842 return ret; 843 } 844 845 /** 846 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface 847 * @dev: batadv_soft_interface used as master interface 848 * @slave_dev: net_device which should become the slave interface 849 * 850 * Return 0 if successful or error otherwise. 851 */ 852 static int batadv_softif_slave_add(struct net_device *dev, 853 struct net_device *slave_dev) 854 { 855 struct batadv_hard_iface *hard_iface; 856 int ret = -EINVAL; 857 858 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 859 if (!hard_iface || hard_iface->soft_iface) 860 goto out; 861 862 ret = batadv_hardif_enable_interface(hard_iface, dev->name); 863 864 out: 865 if (hard_iface) 866 batadv_hardif_free_ref(hard_iface); 867 return ret; 868 } 869 870 /** 871 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface 872 * @dev: batadv_soft_interface used as master interface 873 * @slave_dev: net_device which should be removed from the master interface 874 * 875 * Return 0 if successful or error otherwise. 876 */ 877 static int batadv_softif_slave_del(struct net_device *dev, 878 struct net_device *slave_dev) 879 { 880 struct batadv_hard_iface *hard_iface; 881 int ret = -EINVAL; 882 883 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 884 885 if (!hard_iface || hard_iface->soft_iface != dev) 886 goto out; 887 888 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 889 ret = 0; 890 891 out: 892 if (hard_iface) 893 batadv_hardif_free_ref(hard_iface); 894 return ret; 895 } 896 897 static const struct net_device_ops batadv_netdev_ops = { 898 .ndo_init = batadv_softif_init_late, 899 .ndo_open = batadv_interface_open, 900 .ndo_stop = batadv_interface_release, 901 .ndo_get_stats = batadv_interface_stats, 902 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 903 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 904 .ndo_set_mac_address = batadv_interface_set_mac_addr, 905 .ndo_change_mtu = batadv_interface_change_mtu, 906 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 907 .ndo_start_xmit = batadv_interface_tx, 908 .ndo_validate_addr = eth_validate_addr, 909 .ndo_add_slave = batadv_softif_slave_add, 910 .ndo_del_slave = batadv_softif_slave_del, 911 }; 912 913 /** 914 * batadv_softif_free - Deconstructor of batadv_soft_interface 915 * @dev: Device to cleanup and remove 916 */ 917 static void batadv_softif_free(struct net_device *dev) 918 { 919 batadv_debugfs_del_meshif(dev); 920 batadv_mesh_free(dev); 921 922 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 923 * their tasks. Wait for them all to be finished before freeing the 924 * netdev and its private data (bat_priv) 925 */ 926 rcu_barrier(); 927 928 free_netdev(dev); 929 } 930 931 /** 932 * batadv_softif_init_early - early stage initialization of soft interface 933 * @dev: registered network device to modify 934 */ 935 static void batadv_softif_init_early(struct net_device *dev) 936 { 937 struct batadv_priv *priv = netdev_priv(dev); 938 939 ether_setup(dev); 940 941 dev->netdev_ops = &batadv_netdev_ops; 942 dev->destructor = batadv_softif_free; 943 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER; 944 dev->priv_flags |= IFF_NO_QUEUE; 945 946 /* can't call min_mtu, because the needed variables 947 * have not been initialized yet 948 */ 949 dev->mtu = ETH_DATA_LEN; 950 951 /* generate random address */ 952 eth_hw_addr_random(dev); 953 954 dev->ethtool_ops = &batadv_ethtool_ops; 955 956 memset(priv, 0, sizeof(*priv)); 957 } 958 959 struct net_device *batadv_softif_create(const char *name) 960 { 961 struct net_device *soft_iface; 962 int ret; 963 964 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 965 NET_NAME_UNKNOWN, batadv_softif_init_early); 966 if (!soft_iface) 967 return NULL; 968 969 soft_iface->rtnl_link_ops = &batadv_link_ops; 970 971 ret = register_netdevice(soft_iface); 972 if (ret < 0) { 973 pr_err("Unable to register the batman interface '%s': %i\n", 974 name, ret); 975 free_netdev(soft_iface); 976 return NULL; 977 } 978 979 return soft_iface; 980 } 981 982 /** 983 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs 984 * @soft_iface: the to-be-removed batman-adv interface 985 */ 986 void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 987 { 988 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 989 990 queue_work(batadv_event_workqueue, &bat_priv->cleanup_work); 991 } 992 993 /** 994 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink 995 * @soft_iface: the to-be-removed batman-adv interface 996 * @head: list pointer 997 */ 998 static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 999 struct list_head *head) 1000 { 1001 struct batadv_hard_iface *hard_iface; 1002 1003 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1004 if (hard_iface->soft_iface == soft_iface) 1005 batadv_hardif_disable_interface(hard_iface, 1006 BATADV_IF_CLEANUP_KEEP); 1007 } 1008 1009 batadv_sysfs_del_meshif(soft_iface); 1010 unregister_netdevice_queue(soft_iface, head); 1011 } 1012 1013 int batadv_softif_is_valid(const struct net_device *net_dev) 1014 { 1015 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1016 return 1; 1017 1018 return 0; 1019 } 1020 1021 struct rtnl_link_ops batadv_link_ops __read_mostly = { 1022 .kind = "batadv", 1023 .priv_size = sizeof(struct batadv_priv), 1024 .setup = batadv_softif_init_early, 1025 .dellink = batadv_softif_destroy_netlink, 1026 }; 1027 1028 /* ethtool */ 1029 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1030 { 1031 cmd->supported = 0; 1032 cmd->advertising = 0; 1033 ethtool_cmd_speed_set(cmd, SPEED_10); 1034 cmd->duplex = DUPLEX_FULL; 1035 cmd->port = PORT_TP; 1036 cmd->phy_address = 0; 1037 cmd->transceiver = XCVR_INTERNAL; 1038 cmd->autoneg = AUTONEG_DISABLE; 1039 cmd->maxtxpkt = 0; 1040 cmd->maxrxpkt = 0; 1041 1042 return 0; 1043 } 1044 1045 static void batadv_get_drvinfo(struct net_device *dev, 1046 struct ethtool_drvinfo *info) 1047 { 1048 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 1049 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 1050 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 1051 strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); 1052 } 1053 1054 static u32 batadv_get_msglevel(struct net_device *dev) 1055 { 1056 return -EOPNOTSUPP; 1057 } 1058 1059 static void batadv_set_msglevel(struct net_device *dev, u32 value) 1060 { 1061 } 1062 1063 static u32 batadv_get_link(struct net_device *dev) 1064 { 1065 return 1; 1066 } 1067 1068 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 1069 * Declare each description string in struct.name[] to get fixed sized buffer 1070 * and compile time checking for strings longer than ETH_GSTRING_LEN. 1071 */ 1072 static const struct { 1073 const char name[ETH_GSTRING_LEN]; 1074 } batadv_counters_strings[] = { 1075 { "tx" }, 1076 { "tx_bytes" }, 1077 { "tx_dropped" }, 1078 { "rx" }, 1079 { "rx_bytes" }, 1080 { "forward" }, 1081 { "forward_bytes" }, 1082 { "mgmt_tx" }, 1083 { "mgmt_tx_bytes" }, 1084 { "mgmt_rx" }, 1085 { "mgmt_rx_bytes" }, 1086 { "frag_tx" }, 1087 { "frag_tx_bytes" }, 1088 { "frag_rx" }, 1089 { "frag_rx_bytes" }, 1090 { "frag_fwd" }, 1091 { "frag_fwd_bytes" }, 1092 { "tt_request_tx" }, 1093 { "tt_request_rx" }, 1094 { "tt_response_tx" }, 1095 { "tt_response_rx" }, 1096 { "tt_roam_adv_tx" }, 1097 { "tt_roam_adv_rx" }, 1098 #ifdef CONFIG_BATMAN_ADV_DAT 1099 { "dat_get_tx" }, 1100 { "dat_get_rx" }, 1101 { "dat_put_tx" }, 1102 { "dat_put_rx" }, 1103 { "dat_cached_reply_tx" }, 1104 #endif 1105 #ifdef CONFIG_BATMAN_ADV_NC 1106 { "nc_code" }, 1107 { "nc_code_bytes" }, 1108 { "nc_recode" }, 1109 { "nc_recode_bytes" }, 1110 { "nc_buffer" }, 1111 { "nc_decode" }, 1112 { "nc_decode_bytes" }, 1113 { "nc_decode_failed" }, 1114 { "nc_sniffed" }, 1115 #endif 1116 }; 1117 1118 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 1119 { 1120 if (stringset == ETH_SS_STATS) 1121 memcpy(data, batadv_counters_strings, 1122 sizeof(batadv_counters_strings)); 1123 } 1124 1125 static void batadv_get_ethtool_stats(struct net_device *dev, 1126 struct ethtool_stats *stats, u64 *data) 1127 { 1128 struct batadv_priv *bat_priv = netdev_priv(dev); 1129 int i; 1130 1131 for (i = 0; i < BATADV_CNT_NUM; i++) 1132 data[i] = batadv_sum_counter(bat_priv, i); 1133 } 1134 1135 static int batadv_get_sset_count(struct net_device *dev, int stringset) 1136 { 1137 if (stringset == ETH_SS_STATS) 1138 return BATADV_CNT_NUM; 1139 1140 return -EOPNOTSUPP; 1141 } 1142