1 /* Copyright (C) 2007-2016 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/kref.h> 34 #include <linux/list.h> 35 #include <linux/lockdep.h> 36 #include <linux/netdevice.h> 37 #include <linux/percpu.h> 38 #include <linux/printk.h> 39 #include <linux/random.h> 40 #include <linux/rculist.h> 41 #include <linux/rcupdate.h> 42 #include <linux/rtnetlink.h> 43 #include <linux/skbuff.h> 44 #include <linux/slab.h> 45 #include <linux/socket.h> 46 #include <linux/spinlock.h> 47 #include <linux/stddef.h> 48 #include <linux/string.h> 49 #include <linux/types.h> 50 51 #include "bat_algo.h" 52 #include "bridge_loop_avoidance.h" 53 #include "debugfs.h" 54 #include "distributed-arp-table.h" 55 #include "gateway_client.h" 56 #include "gateway_common.h" 57 #include "hard-interface.h" 58 #include "multicast.h" 59 #include "network-coding.h" 60 #include "originator.h" 61 #include "packet.h" 62 #include "send.h" 63 #include "sysfs.h" 64 #include "translation-table.h" 65 66 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); 67 static void batadv_get_drvinfo(struct net_device *dev, 68 struct ethtool_drvinfo *info); 69 static u32 batadv_get_msglevel(struct net_device *dev); 70 static void batadv_set_msglevel(struct net_device *dev, u32 value); 71 static u32 batadv_get_link(struct net_device *dev); 72 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data); 73 static void batadv_get_ethtool_stats(struct net_device *dev, 74 struct ethtool_stats *stats, u64 *data); 75 static int batadv_get_sset_count(struct net_device *dev, int stringset); 76 77 static const struct ethtool_ops batadv_ethtool_ops = { 78 .get_settings = batadv_get_settings, 79 .get_drvinfo = batadv_get_drvinfo, 80 .get_msglevel = batadv_get_msglevel, 81 .set_msglevel = batadv_set_msglevel, 82 .get_link = batadv_get_link, 83 .get_strings = batadv_get_strings, 84 .get_ethtool_stats = batadv_get_ethtool_stats, 85 .get_sset_count = batadv_get_sset_count, 86 }; 87 88 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) 89 { 90 int result; 91 92 /* TODO: We must check if we can release all references to non-payload 93 * data using skb_header_release in our skbs to allow skb_cow_header to 94 * work optimally. This means that those skbs are not allowed to read 95 * or write any data which is before the current position of skb->data 96 * after that call and thus allow other skbs with the same data buffer 97 * to write freely in that area. 98 */ 99 result = skb_cow_head(skb, len); 100 if (result < 0) 101 return result; 102 103 skb_push(skb, len); 104 return 0; 105 } 106 107 static int batadv_interface_open(struct net_device *dev) 108 { 109 netif_start_queue(dev); 110 return 0; 111 } 112 113 static int batadv_interface_release(struct net_device *dev) 114 { 115 netif_stop_queue(dev); 116 return 0; 117 } 118 119 static struct net_device_stats *batadv_interface_stats(struct net_device *dev) 120 { 121 struct batadv_priv *bat_priv = netdev_priv(dev); 122 struct net_device_stats *stats = &bat_priv->stats; 123 124 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); 125 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); 126 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); 127 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); 128 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); 129 return stats; 130 } 131 132 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) 133 { 134 struct batadv_priv *bat_priv = netdev_priv(dev); 135 struct batadv_softif_vlan *vlan; 136 struct sockaddr *addr = p; 137 u8 old_addr[ETH_ALEN]; 138 139 if (!is_valid_ether_addr(addr->sa_data)) 140 return -EADDRNOTAVAIL; 141 142 ether_addr_copy(old_addr, dev->dev_addr); 143 ether_addr_copy(dev->dev_addr, addr->sa_data); 144 145 /* only modify transtable if it has been initialized before */ 146 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 147 return 0; 148 149 rcu_read_lock(); 150 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 151 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, 152 "mac address changed", false); 153 batadv_tt_local_add(dev, addr->sa_data, vlan->vid, 154 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 155 } 156 rcu_read_unlock(); 157 158 return 0; 159 } 160 161 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 162 { 163 /* check ranges */ 164 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev))) 165 return -EINVAL; 166 167 dev->mtu = new_mtu; 168 169 return 0; 170 } 171 172 /** 173 * batadv_interface_set_rx_mode - set the rx mode of a device 174 * @dev: registered network device to modify 175 * 176 * We do not actually need to set any rx filters for the virtual batman 177 * soft interface. However a dummy handler enables a user to set static 178 * multicast listeners for instance. 179 */ 180 static void batadv_interface_set_rx_mode(struct net_device *dev) 181 { 182 } 183 184 static int batadv_interface_tx(struct sk_buff *skb, 185 struct net_device *soft_iface) 186 { 187 struct ethhdr *ethhdr; 188 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 189 struct batadv_hard_iface *primary_if = NULL; 190 struct batadv_bcast_packet *bcast_packet; 191 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 192 0x00, 0x00}; 193 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 194 0x00, 0x00}; 195 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 196 u8 *dst_hint = NULL, chaddr[ETH_ALEN]; 197 struct vlan_ethhdr *vhdr; 198 unsigned int header_len = 0; 199 int data_len = skb->len, ret; 200 unsigned long brd_delay = 1; 201 bool do_bcast = false, client_added; 202 unsigned short vid; 203 u32 seqno; 204 int gw_mode; 205 enum batadv_forw_mode forw_mode; 206 struct batadv_orig_node *mcast_single_orig = NULL; 207 int network_offset = ETH_HLEN; 208 209 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 210 goto dropped; 211 212 netif_trans_update(soft_iface); 213 vid = batadv_get_vid(skb, 0); 214 ethhdr = eth_hdr(skb); 215 216 switch (ntohs(ethhdr->h_proto)) { 217 case ETH_P_8021Q: 218 vhdr = vlan_eth_hdr(skb); 219 220 /* drop batman-in-batman packets to prevent loops */ 221 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) { 222 network_offset += VLAN_HLEN; 223 break; 224 } 225 226 /* fall through */ 227 case ETH_P_BATMAN: 228 goto dropped; 229 } 230 231 skb_set_network_header(skb, network_offset); 232 233 if (batadv_bla_tx(bat_priv, skb, vid)) 234 goto dropped; 235 236 /* skb->data might have been reallocated by batadv_bla_tx() */ 237 ethhdr = eth_hdr(skb); 238 239 /* Register the client MAC in the transtable */ 240 if (!is_multicast_ether_addr(ethhdr->h_source)) { 241 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 242 vid, skb->skb_iif, 243 skb->mark); 244 if (!client_added) 245 goto dropped; 246 } 247 248 /* don't accept stp packets. STP does not help in meshes. 249 * better use the bridge loop avoidance ... 250 * 251 * The same goes for ECTP sent at least by some Cisco Switches, 252 * it might confuse the mesh when used with bridge loop avoidance. 253 */ 254 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 255 goto dropped; 256 257 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 258 goto dropped; 259 260 gw_mode = atomic_read(&bat_priv->gw.mode); 261 if (is_multicast_ether_addr(ethhdr->h_dest)) { 262 /* if gw mode is off, broadcast every packet */ 263 if (gw_mode == BATADV_GW_MODE_OFF) { 264 do_bcast = true; 265 goto send; 266 } 267 268 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 269 chaddr); 270 /* skb->data may have been modified by 271 * batadv_gw_dhcp_recipient_get() 272 */ 273 ethhdr = eth_hdr(skb); 274 /* if gw_mode is on, broadcast any non-DHCP message. 275 * All the DHCP packets are going to be sent as unicast 276 */ 277 if (dhcp_rcp == BATADV_DHCP_NO) { 278 do_bcast = true; 279 goto send; 280 } 281 282 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 283 dst_hint = chaddr; 284 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 285 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 286 /* gateways should not forward any DHCP message if 287 * directed to a DHCP server 288 */ 289 goto dropped; 290 291 send: 292 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 293 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 294 &mcast_single_orig); 295 if (forw_mode == BATADV_FORW_NONE) 296 goto dropped; 297 298 if (forw_mode == BATADV_FORW_SINGLE) 299 do_bcast = false; 300 } 301 } 302 303 batadv_skb_set_priority(skb, 0); 304 305 /* ethernet packet should be broadcasted */ 306 if (do_bcast) { 307 primary_if = batadv_primary_if_get_selected(bat_priv); 308 if (!primary_if) 309 goto dropped; 310 311 /* in case of ARP request, we do not immediately broadcasti the 312 * packet, instead we first wait for DAT to try to retrieve the 313 * correct ARP entry 314 */ 315 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 316 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 317 318 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 319 goto dropped; 320 321 bcast_packet = (struct batadv_bcast_packet *)skb->data; 322 bcast_packet->version = BATADV_COMPAT_VERSION; 323 bcast_packet->ttl = BATADV_TTL; 324 325 /* batman packet type: broadcast */ 326 bcast_packet->packet_type = BATADV_BCAST; 327 bcast_packet->reserved = 0; 328 329 /* hw address of first interface is the orig mac because only 330 * this mac is known throughout the mesh 331 */ 332 ether_addr_copy(bcast_packet->orig, 333 primary_if->net_dev->dev_addr); 334 335 /* set broadcast sequence number */ 336 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 337 bcast_packet->seqno = htonl(seqno); 338 339 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); 340 341 /* a copy is stored in the bcast list, therefore removing 342 * the original skb. 343 */ 344 kfree_skb(skb); 345 346 /* unicast packet */ 347 } else { 348 /* DHCP packets going to a server will use the GW feature */ 349 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 350 ret = batadv_gw_out_of_range(bat_priv, skb); 351 if (ret) 352 goto dropped; 353 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 354 } else if (mcast_single_orig) { 355 ret = batadv_send_skb_unicast(bat_priv, skb, 356 BATADV_UNICAST, 0, 357 mcast_single_orig, vid); 358 } else { 359 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 360 skb)) 361 goto dropped; 362 363 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 364 365 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 366 vid); 367 } 368 if (ret == NET_XMIT_DROP) 369 goto dropped_freed; 370 } 371 372 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 373 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 374 goto end; 375 376 dropped: 377 kfree_skb(skb); 378 dropped_freed: 379 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 380 end: 381 if (mcast_single_orig) 382 batadv_orig_node_put(mcast_single_orig); 383 if (primary_if) 384 batadv_hardif_put(primary_if); 385 return NETDEV_TX_OK; 386 } 387 388 /** 389 * batadv_interface_rx - receive ethernet frame on local batman-adv interface 390 * @soft_iface: local interface which will receive the ethernet frame 391 * @skb: ethernet frame for @soft_iface 392 * @hdr_size: size of already parsed batman-adv header 393 * @orig_node: originator from which the batman-adv packet was sent 394 * 395 * Sends a ethernet frame to the receive path of the local @soft_iface. 396 * skb->data has still point to the batman-adv header with the size @hdr_size. 397 * The caller has to have parsed this header already and made sure that at least 398 * @hdr_size bytes are still available for pull in @skb. 399 * 400 * The packet may still get dropped. This can happen when the encapsulated 401 * ethernet frame is invalid or contains again an batman-adv packet. Also 402 * unicast packets will be dropped directly when it was sent between two 403 * isolated clients. 404 */ 405 void batadv_interface_rx(struct net_device *soft_iface, 406 struct sk_buff *skb, int hdr_size, 407 struct batadv_orig_node *orig_node) 408 { 409 struct batadv_bcast_packet *batadv_bcast_packet; 410 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 411 struct vlan_ethhdr *vhdr; 412 struct ethhdr *ethhdr; 413 unsigned short vid; 414 bool is_bcast; 415 416 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 417 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 418 419 skb_pull_rcsum(skb, hdr_size); 420 skb_reset_mac_header(skb); 421 422 /* clean the netfilter state now that the batman-adv header has been 423 * removed 424 */ 425 nf_reset(skb); 426 427 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 428 goto dropped; 429 430 vid = batadv_get_vid(skb, 0); 431 ethhdr = eth_hdr(skb); 432 433 switch (ntohs(ethhdr->h_proto)) { 434 case ETH_P_8021Q: 435 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 436 goto dropped; 437 438 vhdr = (struct vlan_ethhdr *)skb->data; 439 440 /* drop batman-in-batman packets to prevent loops */ 441 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) 442 break; 443 444 /* fall through */ 445 case ETH_P_BATMAN: 446 goto dropped; 447 } 448 449 /* skb->dev & skb->pkt_type are set here */ 450 skb->protocol = eth_type_trans(skb, soft_iface); 451 452 /* should not be necessary anymore as we use skb_pull_rcsum() 453 * TODO: please verify this and remove this TODO 454 * -- Dec 21st 2009, Simon Wunderlich 455 */ 456 457 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ 458 459 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 460 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 461 skb->len + ETH_HLEN); 462 463 soft_iface->last_rx = jiffies; 464 465 /* Let the bridge loop avoidance check the packet. If will 466 * not handle it, we can safely push it up. 467 */ 468 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 469 goto out; 470 471 if (orig_node) 472 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 473 ethhdr->h_source, vid); 474 475 if (is_multicast_ether_addr(ethhdr->h_dest)) { 476 /* set the mark on broadcast packets if AP isolation is ON and 477 * the packet is coming from an "isolated" client 478 */ 479 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 480 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 481 vid)) { 482 /* save bits in skb->mark not covered by the mask and 483 * apply the mark on the rest 484 */ 485 skb->mark &= ~bat_priv->isolation_mark_mask; 486 skb->mark |= bat_priv->isolation_mark; 487 } 488 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 489 ethhdr->h_dest, vid)) { 490 goto dropped; 491 } 492 493 netif_rx(skb); 494 goto out; 495 496 dropped: 497 kfree_skb(skb); 498 out: 499 return; 500 } 501 502 /** 503 * batadv_softif_vlan_release - release vlan from lists and queue for free after 504 * rcu grace period 505 * @ref: kref pointer of the vlan object 506 */ 507 static void batadv_softif_vlan_release(struct kref *ref) 508 { 509 struct batadv_softif_vlan *vlan; 510 511 vlan = container_of(ref, struct batadv_softif_vlan, refcount); 512 513 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 514 hlist_del_rcu(&vlan->list); 515 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 516 517 kfree_rcu(vlan, rcu); 518 } 519 520 /** 521 * batadv_softif_vlan_put - decrease the vlan object refcounter and 522 * possibly release it 523 * @vlan: the vlan object to release 524 */ 525 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan) 526 { 527 if (!vlan) 528 return; 529 530 kref_put(&vlan->refcount, batadv_softif_vlan_release); 531 } 532 533 /** 534 * batadv_softif_vlan_get - get the vlan object for a specific vid 535 * @bat_priv: the bat priv with all the soft interface information 536 * @vid: the identifier of the vlan object to retrieve 537 * 538 * Return: the private data of the vlan matching the vid passed as argument or 539 * NULL otherwise. The refcounter of the returned object is incremented by 1. 540 */ 541 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 542 unsigned short vid) 543 { 544 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 545 546 rcu_read_lock(); 547 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 548 if (vlan_tmp->vid != vid) 549 continue; 550 551 if (!kref_get_unless_zero(&vlan_tmp->refcount)) 552 continue; 553 554 vlan = vlan_tmp; 555 break; 556 } 557 rcu_read_unlock(); 558 559 return vlan; 560 } 561 562 /** 563 * batadv_softif_create_vlan - allocate the needed resources for a new vlan 564 * @bat_priv: the bat priv with all the soft interface information 565 * @vid: the VLAN identifier 566 * 567 * Return: 0 on success, a negative error otherwise. 568 */ 569 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 570 { 571 struct batadv_softif_vlan *vlan; 572 int err; 573 574 vlan = batadv_softif_vlan_get(bat_priv, vid); 575 if (vlan) { 576 batadv_softif_vlan_put(vlan); 577 return -EEXIST; 578 } 579 580 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 581 if (!vlan) 582 return -ENOMEM; 583 584 vlan->bat_priv = bat_priv; 585 vlan->vid = vid; 586 kref_init(&vlan->refcount); 587 588 atomic_set(&vlan->ap_isolation, 0); 589 590 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 591 if (err) { 592 kfree(vlan); 593 return err; 594 } 595 596 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 597 kref_get(&vlan->refcount); 598 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 599 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 600 601 /* add a new TT local entry. This one will be marked with the NOPURGE 602 * flag 603 */ 604 batadv_tt_local_add(bat_priv->soft_iface, 605 bat_priv->soft_iface->dev_addr, vid, 606 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 607 608 /* don't return reference to new softif_vlan */ 609 batadv_softif_vlan_put(vlan); 610 611 return 0; 612 } 613 614 /** 615 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object 616 * @bat_priv: the bat priv with all the soft interface information 617 * @vlan: the object to remove 618 */ 619 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 620 struct batadv_softif_vlan *vlan) 621 { 622 /* explicitly remove the associated TT local entry because it is marked 623 * with the NOPURGE flag 624 */ 625 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 626 vlan->vid, "vlan interface destroyed", false); 627 628 batadv_sysfs_del_vlan(bat_priv, vlan); 629 batadv_softif_vlan_put(vlan); 630 } 631 632 /** 633 * batadv_interface_add_vid - ndo_add_vid API implementation 634 * @dev: the netdev of the mesh interface 635 * @proto: protocol of the the vlan id 636 * @vid: identifier of the new vlan 637 * 638 * Set up all the internal structures for handling the new vlan on top of the 639 * mesh interface 640 * 641 * Return: 0 on success or a negative error code in case of failure. 642 */ 643 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 644 unsigned short vid) 645 { 646 struct batadv_priv *bat_priv = netdev_priv(dev); 647 struct batadv_softif_vlan *vlan; 648 int ret; 649 650 /* only 802.1Q vlans are supported. 651 * batman-adv does not know how to handle other types 652 */ 653 if (proto != htons(ETH_P_8021Q)) 654 return -EINVAL; 655 656 vid |= BATADV_VLAN_HAS_TAG; 657 658 /* if a new vlan is getting created and it already exists, it means that 659 * it was not deleted yet. batadv_softif_vlan_get() increases the 660 * refcount in order to revive the object. 661 * 662 * if it does not exist then create it. 663 */ 664 vlan = batadv_softif_vlan_get(bat_priv, vid); 665 if (!vlan) 666 return batadv_softif_create_vlan(bat_priv, vid); 667 668 /* recreate the sysfs object if it was already destroyed (and it should 669 * be since we received a kill_vid() for this vlan 670 */ 671 if (!vlan->kobj) { 672 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 673 if (ret) { 674 batadv_softif_vlan_put(vlan); 675 return ret; 676 } 677 } 678 679 /* add a new TT local entry. This one will be marked with the NOPURGE 680 * flag. This must be added again, even if the vlan object already 681 * exists, because the entry was deleted by kill_vid() 682 */ 683 batadv_tt_local_add(bat_priv->soft_iface, 684 bat_priv->soft_iface->dev_addr, vid, 685 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 686 687 return 0; 688 } 689 690 /** 691 * batadv_interface_kill_vid - ndo_kill_vid API implementation 692 * @dev: the netdev of the mesh interface 693 * @proto: protocol of the the vlan id 694 * @vid: identifier of the deleted vlan 695 * 696 * Destroy all the internal structures used to handle the vlan identified by vid 697 * on top of the mesh interface 698 * 699 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 700 * or -ENOENT if the specified vlan id wasn't registered. 701 */ 702 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 703 unsigned short vid) 704 { 705 struct batadv_priv *bat_priv = netdev_priv(dev); 706 struct batadv_softif_vlan *vlan; 707 708 /* only 802.1Q vlans are supported. batman-adv does not know how to 709 * handle other types 710 */ 711 if (proto != htons(ETH_P_8021Q)) 712 return -EINVAL; 713 714 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 715 if (!vlan) 716 return -ENOENT; 717 718 batadv_softif_destroy_vlan(bat_priv, vlan); 719 720 /* finally free the vlan object */ 721 batadv_softif_vlan_put(vlan); 722 723 return 0; 724 } 725 726 /* batman-adv network devices have devices nesting below it and are a special 727 * "super class" of normal network devices; split their locks off into a 728 * separate class since they always nest. 729 */ 730 static struct lock_class_key batadv_netdev_xmit_lock_key; 731 static struct lock_class_key batadv_netdev_addr_lock_key; 732 733 /** 734 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue 735 * @dev: device which owns the tx queue 736 * @txq: tx queue to modify 737 * @_unused: always NULL 738 */ 739 static void batadv_set_lockdep_class_one(struct net_device *dev, 740 struct netdev_queue *txq, 741 void *_unused) 742 { 743 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 744 } 745 746 /** 747 * batadv_set_lockdep_class - Set txq and addr_list lockdep class 748 * @dev: network device to modify 749 */ 750 static void batadv_set_lockdep_class(struct net_device *dev) 751 { 752 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 753 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 754 } 755 756 /** 757 * batadv_softif_init_late - late stage initialization of soft interface 758 * @dev: registered network device to modify 759 * 760 * Return: error code on failures 761 */ 762 static int batadv_softif_init_late(struct net_device *dev) 763 { 764 struct batadv_priv *bat_priv; 765 u32 random_seqno; 766 int ret; 767 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 768 769 batadv_set_lockdep_class(dev); 770 771 bat_priv = netdev_priv(dev); 772 bat_priv->soft_iface = dev; 773 774 /* batadv_interface_stats() needs to be available as soon as 775 * register_netdevice() has been called 776 */ 777 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 778 if (!bat_priv->bat_counters) 779 return -ENOMEM; 780 781 atomic_set(&bat_priv->aggregated_ogms, 1); 782 atomic_set(&bat_priv->bonding, 0); 783 #ifdef CONFIG_BATMAN_ADV_BLA 784 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 785 #endif 786 #ifdef CONFIG_BATMAN_ADV_DAT 787 atomic_set(&bat_priv->distributed_arp_table, 1); 788 #endif 789 #ifdef CONFIG_BATMAN_ADV_MCAST 790 bat_priv->mcast.querier_ipv4.exists = false; 791 bat_priv->mcast.querier_ipv4.shadowing = false; 792 bat_priv->mcast.querier_ipv6.exists = false; 793 bat_priv->mcast.querier_ipv6.shadowing = false; 794 bat_priv->mcast.flags = BATADV_NO_FLAGS; 795 atomic_set(&bat_priv->multicast_mode, 1); 796 atomic_set(&bat_priv->mcast.num_disabled, 0); 797 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 798 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 799 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 800 #endif 801 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); 802 atomic_set(&bat_priv->gw.sel_class, 20); 803 atomic_set(&bat_priv->gw.bandwidth_down, 100); 804 atomic_set(&bat_priv->gw.bandwidth_up, 20); 805 atomic_set(&bat_priv->orig_interval, 1000); 806 atomic_set(&bat_priv->hop_penalty, 30); 807 #ifdef CONFIG_BATMAN_ADV_DEBUG 808 atomic_set(&bat_priv->log_level, 0); 809 #endif 810 atomic_set(&bat_priv->fragmentation, 1); 811 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 812 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 813 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 814 815 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 816 atomic_set(&bat_priv->bcast_seqno, 1); 817 atomic_set(&bat_priv->tt.vn, 0); 818 atomic_set(&bat_priv->tt.local_changes, 0); 819 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 820 #ifdef CONFIG_BATMAN_ADV_BLA 821 atomic_set(&bat_priv->bla.num_requests, 0); 822 #endif 823 atomic_set(&bat_priv->tp_num, 0); 824 825 bat_priv->tt.last_changeset = NULL; 826 bat_priv->tt.last_changeset_len = 0; 827 bat_priv->isolation_mark = 0; 828 bat_priv->isolation_mark_mask = 0; 829 830 /* randomize initial seqno to avoid collision */ 831 get_random_bytes(&random_seqno, sizeof(random_seqno)); 832 atomic_set(&bat_priv->frag_seqno, random_seqno); 833 834 bat_priv->primary_if = NULL; 835 bat_priv->num_ifaces = 0; 836 837 batadv_nc_init_bat_priv(bat_priv); 838 839 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 840 if (ret < 0) 841 goto free_bat_counters; 842 843 ret = batadv_debugfs_add_meshif(dev); 844 if (ret < 0) 845 goto free_bat_counters; 846 847 ret = batadv_mesh_init(dev); 848 if (ret < 0) 849 goto unreg_debugfs; 850 851 return 0; 852 853 unreg_debugfs: 854 batadv_debugfs_del_meshif(dev); 855 free_bat_counters: 856 free_percpu(bat_priv->bat_counters); 857 bat_priv->bat_counters = NULL; 858 859 return ret; 860 } 861 862 /** 863 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface 864 * @dev: batadv_soft_interface used as master interface 865 * @slave_dev: net_device which should become the slave interface 866 * 867 * Return: 0 if successful or error otherwise. 868 */ 869 static int batadv_softif_slave_add(struct net_device *dev, 870 struct net_device *slave_dev) 871 { 872 struct batadv_hard_iface *hard_iface; 873 struct net *net = dev_net(dev); 874 int ret = -EINVAL; 875 876 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 877 if (!hard_iface || hard_iface->soft_iface) 878 goto out; 879 880 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name); 881 882 out: 883 if (hard_iface) 884 batadv_hardif_put(hard_iface); 885 return ret; 886 } 887 888 /** 889 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface 890 * @dev: batadv_soft_interface used as master interface 891 * @slave_dev: net_device which should be removed from the master interface 892 * 893 * Return: 0 if successful or error otherwise. 894 */ 895 static int batadv_softif_slave_del(struct net_device *dev, 896 struct net_device *slave_dev) 897 { 898 struct batadv_hard_iface *hard_iface; 899 int ret = -EINVAL; 900 901 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 902 903 if (!hard_iface || hard_iface->soft_iface != dev) 904 goto out; 905 906 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 907 ret = 0; 908 909 out: 910 if (hard_iface) 911 batadv_hardif_put(hard_iface); 912 return ret; 913 } 914 915 static const struct net_device_ops batadv_netdev_ops = { 916 .ndo_init = batadv_softif_init_late, 917 .ndo_open = batadv_interface_open, 918 .ndo_stop = batadv_interface_release, 919 .ndo_get_stats = batadv_interface_stats, 920 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 921 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 922 .ndo_set_mac_address = batadv_interface_set_mac_addr, 923 .ndo_change_mtu = batadv_interface_change_mtu, 924 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 925 .ndo_start_xmit = batadv_interface_tx, 926 .ndo_validate_addr = eth_validate_addr, 927 .ndo_add_slave = batadv_softif_slave_add, 928 .ndo_del_slave = batadv_softif_slave_del, 929 }; 930 931 /** 932 * batadv_softif_free - Deconstructor of batadv_soft_interface 933 * @dev: Device to cleanup and remove 934 */ 935 static void batadv_softif_free(struct net_device *dev) 936 { 937 batadv_debugfs_del_meshif(dev); 938 batadv_mesh_free(dev); 939 940 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 941 * their tasks. Wait for them all to be finished before freeing the 942 * netdev and its private data (bat_priv) 943 */ 944 rcu_barrier(); 945 946 free_netdev(dev); 947 } 948 949 /** 950 * batadv_softif_init_early - early stage initialization of soft interface 951 * @dev: registered network device to modify 952 */ 953 static void batadv_softif_init_early(struct net_device *dev) 954 { 955 struct batadv_priv *priv = netdev_priv(dev); 956 957 ether_setup(dev); 958 959 dev->netdev_ops = &batadv_netdev_ops; 960 dev->destructor = batadv_softif_free; 961 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; 962 dev->priv_flags |= IFF_NO_QUEUE; 963 964 /* can't call min_mtu, because the needed variables 965 * have not been initialized yet 966 */ 967 dev->mtu = ETH_DATA_LEN; 968 969 /* generate random address */ 970 eth_hw_addr_random(dev); 971 972 dev->ethtool_ops = &batadv_ethtool_ops; 973 974 memset(priv, 0, sizeof(*priv)); 975 } 976 977 struct net_device *batadv_softif_create(struct net *net, const char *name) 978 { 979 struct net_device *soft_iface; 980 int ret; 981 982 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 983 NET_NAME_UNKNOWN, batadv_softif_init_early); 984 if (!soft_iface) 985 return NULL; 986 987 dev_net_set(soft_iface, net); 988 989 soft_iface->rtnl_link_ops = &batadv_link_ops; 990 991 ret = register_netdevice(soft_iface); 992 if (ret < 0) { 993 pr_err("Unable to register the batman interface '%s': %i\n", 994 name, ret); 995 free_netdev(soft_iface); 996 return NULL; 997 } 998 999 return soft_iface; 1000 } 1001 1002 /** 1003 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs 1004 * @soft_iface: the to-be-removed batman-adv interface 1005 */ 1006 void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 1007 { 1008 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1009 struct batadv_softif_vlan *vlan; 1010 1011 ASSERT_RTNL(); 1012 1013 /* destroy the "untagged" VLAN */ 1014 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1015 if (vlan) { 1016 batadv_softif_destroy_vlan(bat_priv, vlan); 1017 batadv_softif_vlan_put(vlan); 1018 } 1019 1020 batadv_sysfs_del_meshif(soft_iface); 1021 unregister_netdevice(soft_iface); 1022 } 1023 1024 /** 1025 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink 1026 * @soft_iface: the to-be-removed batman-adv interface 1027 * @head: list pointer 1028 */ 1029 static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1030 struct list_head *head) 1031 { 1032 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1033 struct batadv_hard_iface *hard_iface; 1034 struct batadv_softif_vlan *vlan; 1035 1036 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1037 if (hard_iface->soft_iface == soft_iface) 1038 batadv_hardif_disable_interface(hard_iface, 1039 BATADV_IF_CLEANUP_KEEP); 1040 } 1041 1042 /* destroy the "untagged" VLAN */ 1043 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1044 if (vlan) { 1045 batadv_softif_destroy_vlan(bat_priv, vlan); 1046 batadv_softif_vlan_put(vlan); 1047 } 1048 1049 batadv_sysfs_del_meshif(soft_iface); 1050 unregister_netdevice_queue(soft_iface, head); 1051 } 1052 1053 bool batadv_softif_is_valid(const struct net_device *net_dev) 1054 { 1055 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1056 return true; 1057 1058 return false; 1059 } 1060 1061 struct rtnl_link_ops batadv_link_ops __read_mostly = { 1062 .kind = "batadv", 1063 .priv_size = sizeof(struct batadv_priv), 1064 .setup = batadv_softif_init_early, 1065 .dellink = batadv_softif_destroy_netlink, 1066 }; 1067 1068 /* ethtool */ 1069 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1070 { 1071 cmd->supported = 0; 1072 cmd->advertising = 0; 1073 ethtool_cmd_speed_set(cmd, SPEED_10); 1074 cmd->duplex = DUPLEX_FULL; 1075 cmd->port = PORT_TP; 1076 cmd->phy_address = 0; 1077 cmd->transceiver = XCVR_INTERNAL; 1078 cmd->autoneg = AUTONEG_DISABLE; 1079 cmd->maxtxpkt = 0; 1080 cmd->maxrxpkt = 0; 1081 1082 return 0; 1083 } 1084 1085 static void batadv_get_drvinfo(struct net_device *dev, 1086 struct ethtool_drvinfo *info) 1087 { 1088 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 1089 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 1090 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 1091 strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); 1092 } 1093 1094 static u32 batadv_get_msglevel(struct net_device *dev) 1095 { 1096 return -EOPNOTSUPP; 1097 } 1098 1099 static void batadv_set_msglevel(struct net_device *dev, u32 value) 1100 { 1101 } 1102 1103 static u32 batadv_get_link(struct net_device *dev) 1104 { 1105 return 1; 1106 } 1107 1108 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 1109 * Declare each description string in struct.name[] to get fixed sized buffer 1110 * and compile time checking for strings longer than ETH_GSTRING_LEN. 1111 */ 1112 static const struct { 1113 const char name[ETH_GSTRING_LEN]; 1114 } batadv_counters_strings[] = { 1115 { "tx" }, 1116 { "tx_bytes" }, 1117 { "tx_dropped" }, 1118 { "rx" }, 1119 { "rx_bytes" }, 1120 { "forward" }, 1121 { "forward_bytes" }, 1122 { "mgmt_tx" }, 1123 { "mgmt_tx_bytes" }, 1124 { "mgmt_rx" }, 1125 { "mgmt_rx_bytes" }, 1126 { "frag_tx" }, 1127 { "frag_tx_bytes" }, 1128 { "frag_rx" }, 1129 { "frag_rx_bytes" }, 1130 { "frag_fwd" }, 1131 { "frag_fwd_bytes" }, 1132 { "tt_request_tx" }, 1133 { "tt_request_rx" }, 1134 { "tt_response_tx" }, 1135 { "tt_response_rx" }, 1136 { "tt_roam_adv_tx" }, 1137 { "tt_roam_adv_rx" }, 1138 #ifdef CONFIG_BATMAN_ADV_DAT 1139 { "dat_get_tx" }, 1140 { "dat_get_rx" }, 1141 { "dat_put_tx" }, 1142 { "dat_put_rx" }, 1143 { "dat_cached_reply_tx" }, 1144 #endif 1145 #ifdef CONFIG_BATMAN_ADV_NC 1146 { "nc_code" }, 1147 { "nc_code_bytes" }, 1148 { "nc_recode" }, 1149 { "nc_recode_bytes" }, 1150 { "nc_buffer" }, 1151 { "nc_decode" }, 1152 { "nc_decode_bytes" }, 1153 { "nc_decode_failed" }, 1154 { "nc_sniffed" }, 1155 #endif 1156 }; 1157 1158 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 1159 { 1160 if (stringset == ETH_SS_STATS) 1161 memcpy(data, batadv_counters_strings, 1162 sizeof(batadv_counters_strings)); 1163 } 1164 1165 static void batadv_get_ethtool_stats(struct net_device *dev, 1166 struct ethtool_stats *stats, u64 *data) 1167 { 1168 struct batadv_priv *bat_priv = netdev_priv(dev); 1169 int i; 1170 1171 for (i = 0; i < BATADV_CNT_NUM; i++) 1172 data[i] = batadv_sum_counter(bat_priv, i); 1173 } 1174 1175 static int batadv_get_sset_count(struct net_device *dev, int stringset) 1176 { 1177 if (stringset == ETH_SS_STATS) 1178 return BATADV_CNT_NUM; 1179 1180 return -EOPNOTSUPP; 1181 } 1182