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/skbuff.h> 43 #include <linux/slab.h> 44 #include <linux/socket.h> 45 #include <linux/spinlock.h> 46 #include <linux/stddef.h> 47 #include <linux/string.h> 48 #include <linux/types.h> 49 #include <linux/workqueue.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 "packet.h" 61 #include "send.h" 62 #include "sysfs.h" 63 #include "translation-table.h" 64 65 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); 66 static void batadv_get_drvinfo(struct net_device *dev, 67 struct ethtool_drvinfo *info); 68 static u32 batadv_get_msglevel(struct net_device *dev); 69 static void batadv_set_msglevel(struct net_device *dev, u32 value); 70 static u32 batadv_get_link(struct net_device *dev); 71 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data); 72 static void batadv_get_ethtool_stats(struct net_device *dev, 73 struct ethtool_stats *stats, u64 *data); 74 static int batadv_get_sset_count(struct net_device *dev, int stringset); 75 76 static const struct ethtool_ops batadv_ethtool_ops = { 77 .get_settings = batadv_get_settings, 78 .get_drvinfo = batadv_get_drvinfo, 79 .get_msglevel = batadv_get_msglevel, 80 .set_msglevel = batadv_set_msglevel, 81 .get_link = batadv_get_link, 82 .get_strings = batadv_get_strings, 83 .get_ethtool_stats = batadv_get_ethtool_stats, 84 .get_sset_count = batadv_get_sset_count, 85 }; 86 87 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) 88 { 89 int result; 90 91 /* TODO: We must check if we can release all references to non-payload 92 * data using skb_header_release in our skbs to allow skb_cow_header to 93 * work optimally. This means that those skbs are not allowed to read 94 * or write any data which is before the current position of skb->data 95 * after that call and thus allow other skbs with the same data buffer 96 * to write freely in that area. 97 */ 98 result = skb_cow_head(skb, len); 99 if (result < 0) 100 return result; 101 102 skb_push(skb, len); 103 return 0; 104 } 105 106 static int batadv_interface_open(struct net_device *dev) 107 { 108 netif_start_queue(dev); 109 return 0; 110 } 111 112 static int batadv_interface_release(struct net_device *dev) 113 { 114 netif_stop_queue(dev); 115 return 0; 116 } 117 118 static struct net_device_stats *batadv_interface_stats(struct net_device *dev) 119 { 120 struct batadv_priv *bat_priv = netdev_priv(dev); 121 struct net_device_stats *stats = &bat_priv->stats; 122 123 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); 124 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); 125 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); 126 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); 127 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); 128 return stats; 129 } 130 131 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) 132 { 133 struct batadv_priv *bat_priv = netdev_priv(dev); 134 struct batadv_softif_vlan *vlan; 135 struct sockaddr *addr = p; 136 u8 old_addr[ETH_ALEN]; 137 138 if (!is_valid_ether_addr(addr->sa_data)) 139 return -EADDRNOTAVAIL; 140 141 ether_addr_copy(old_addr, dev->dev_addr); 142 ether_addr_copy(dev->dev_addr, addr->sa_data); 143 144 /* only modify transtable if it has been initialized before */ 145 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 146 return 0; 147 148 rcu_read_lock(); 149 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 150 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, 151 "mac address changed", false); 152 batadv_tt_local_add(dev, addr->sa_data, vlan->vid, 153 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 154 } 155 rcu_read_unlock(); 156 157 return 0; 158 } 159 160 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 161 { 162 /* check ranges */ 163 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev))) 164 return -EINVAL; 165 166 dev->mtu = new_mtu; 167 168 return 0; 169 } 170 171 /** 172 * batadv_interface_set_rx_mode - set the rx mode of a device 173 * @dev: registered network device to modify 174 * 175 * We do not actually need to set any rx filters for the virtual batman 176 * soft interface. However a dummy handler enables a user to set static 177 * multicast listeners for instance. 178 */ 179 static void batadv_interface_set_rx_mode(struct net_device *dev) 180 { 181 } 182 183 static int batadv_interface_tx(struct sk_buff *skb, 184 struct net_device *soft_iface) 185 { 186 struct ethhdr *ethhdr; 187 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 188 struct batadv_hard_iface *primary_if = NULL; 189 struct batadv_bcast_packet *bcast_packet; 190 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 191 0x00, 0x00}; 192 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 193 0x00, 0x00}; 194 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 195 u8 *dst_hint = NULL, chaddr[ETH_ALEN]; 196 struct vlan_ethhdr *vhdr; 197 unsigned int header_len = 0; 198 int data_len = skb->len, ret; 199 unsigned long brd_delay = 1; 200 bool do_bcast = false, client_added; 201 unsigned short vid; 202 u32 seqno; 203 int gw_mode; 204 enum batadv_forw_mode forw_mode; 205 struct batadv_orig_node *mcast_single_orig = NULL; 206 int network_offset = ETH_HLEN; 207 208 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 209 goto dropped; 210 211 netif_trans_update(soft_iface); 212 vid = batadv_get_vid(skb, 0); 213 ethhdr = eth_hdr(skb); 214 215 switch (ntohs(ethhdr->h_proto)) { 216 case ETH_P_8021Q: 217 vhdr = vlan_eth_hdr(skb); 218 219 /* drop batman-in-batman packets to prevent loops */ 220 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) { 221 network_offset += VLAN_HLEN; 222 break; 223 } 224 225 /* fall through */ 226 case ETH_P_BATMAN: 227 goto dropped; 228 } 229 230 skb_set_network_header(skb, network_offset); 231 232 if (batadv_bla_tx(bat_priv, skb, vid)) 233 goto dropped; 234 235 /* skb->data might have been reallocated by batadv_bla_tx() */ 236 ethhdr = eth_hdr(skb); 237 238 /* Register the client MAC in the transtable */ 239 if (!is_multicast_ether_addr(ethhdr->h_source)) { 240 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 241 vid, skb->skb_iif, 242 skb->mark); 243 if (!client_added) 244 goto dropped; 245 } 246 247 /* don't accept stp packets. STP does not help in meshes. 248 * better use the bridge loop avoidance ... 249 * 250 * The same goes for ECTP sent at least by some Cisco Switches, 251 * it might confuse the mesh when used with bridge loop avoidance. 252 */ 253 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 254 goto dropped; 255 256 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 257 goto dropped; 258 259 gw_mode = atomic_read(&bat_priv->gw.mode); 260 if (is_multicast_ether_addr(ethhdr->h_dest)) { 261 /* if gw mode is off, broadcast every packet */ 262 if (gw_mode == BATADV_GW_MODE_OFF) { 263 do_bcast = true; 264 goto send; 265 } 266 267 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 268 chaddr); 269 /* skb->data may have been modified by 270 * batadv_gw_dhcp_recipient_get() 271 */ 272 ethhdr = eth_hdr(skb); 273 /* if gw_mode is on, broadcast any non-DHCP message. 274 * All the DHCP packets are going to be sent as unicast 275 */ 276 if (dhcp_rcp == BATADV_DHCP_NO) { 277 do_bcast = true; 278 goto send; 279 } 280 281 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 282 dst_hint = chaddr; 283 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 284 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 285 /* gateways should not forward any DHCP message if 286 * directed to a DHCP server 287 */ 288 goto dropped; 289 290 send: 291 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 292 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 293 &mcast_single_orig); 294 if (forw_mode == BATADV_FORW_NONE) 295 goto dropped; 296 297 if (forw_mode == BATADV_FORW_SINGLE) 298 do_bcast = false; 299 } 300 } 301 302 batadv_skb_set_priority(skb, 0); 303 304 /* ethernet packet should be broadcasted */ 305 if (do_bcast) { 306 primary_if = batadv_primary_if_get_selected(bat_priv); 307 if (!primary_if) 308 goto dropped; 309 310 /* in case of ARP request, we do not immediately broadcasti the 311 * packet, instead we first wait for DAT to try to retrieve the 312 * correct ARP entry 313 */ 314 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 315 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 316 317 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 318 goto dropped; 319 320 bcast_packet = (struct batadv_bcast_packet *)skb->data; 321 bcast_packet->version = BATADV_COMPAT_VERSION; 322 bcast_packet->ttl = BATADV_TTL; 323 324 /* batman packet type: broadcast */ 325 bcast_packet->packet_type = BATADV_BCAST; 326 bcast_packet->reserved = 0; 327 328 /* hw address of first interface is the orig mac because only 329 * this mac is known throughout the mesh 330 */ 331 ether_addr_copy(bcast_packet->orig, 332 primary_if->net_dev->dev_addr); 333 334 /* set broadcast sequence number */ 335 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 336 bcast_packet->seqno = htonl(seqno); 337 338 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay); 339 340 /* a copy is stored in the bcast list, therefore removing 341 * the original skb. 342 */ 343 kfree_skb(skb); 344 345 /* unicast packet */ 346 } else { 347 /* DHCP packets going to a server will use the GW feature */ 348 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 349 ret = batadv_gw_out_of_range(bat_priv, skb); 350 if (ret) 351 goto dropped; 352 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 353 } else if (mcast_single_orig) { 354 ret = batadv_send_skb_unicast(bat_priv, skb, 355 BATADV_UNICAST, 0, 356 mcast_single_orig, vid); 357 } else { 358 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 359 skb)) 360 goto dropped; 361 362 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 363 364 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 365 vid); 366 } 367 if (ret == NET_XMIT_DROP) 368 goto dropped_freed; 369 } 370 371 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 372 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 373 goto end; 374 375 dropped: 376 kfree_skb(skb); 377 dropped_freed: 378 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 379 end: 380 if (primary_if) 381 batadv_hardif_put(primary_if); 382 return NETDEV_TX_OK; 383 } 384 385 /** 386 * batadv_interface_rx - receive ethernet frame on local batman-adv interface 387 * @soft_iface: local interface which will receive the ethernet frame 388 * @skb: ethernet frame for @soft_iface 389 * @hdr_size: size of already parsed batman-adv header 390 * @orig_node: originator from which the batman-adv packet was sent 391 * 392 * Sends a ethernet frame to the receive path of the local @soft_iface. 393 * skb->data has still point to the batman-adv header with the size @hdr_size. 394 * The caller has to have parsed this header already and made sure that at least 395 * @hdr_size bytes are still available for pull in @skb. 396 * 397 * The packet may still get dropped. This can happen when the encapsulated 398 * ethernet frame is invalid or contains again an batman-adv packet. Also 399 * unicast packets will be dropped directly when it was sent between two 400 * isolated clients. 401 */ 402 void batadv_interface_rx(struct net_device *soft_iface, 403 struct sk_buff *skb, int hdr_size, 404 struct batadv_orig_node *orig_node) 405 { 406 struct batadv_bcast_packet *batadv_bcast_packet; 407 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 408 struct vlan_ethhdr *vhdr; 409 struct ethhdr *ethhdr; 410 unsigned short vid; 411 bool is_bcast; 412 413 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 414 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 415 416 skb_pull_rcsum(skb, hdr_size); 417 skb_reset_mac_header(skb); 418 419 /* clean the netfilter state now that the batman-adv header has been 420 * removed 421 */ 422 nf_reset(skb); 423 424 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 425 goto dropped; 426 427 vid = batadv_get_vid(skb, 0); 428 ethhdr = eth_hdr(skb); 429 430 switch (ntohs(ethhdr->h_proto)) { 431 case ETH_P_8021Q: 432 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 433 goto dropped; 434 435 vhdr = (struct vlan_ethhdr *)skb->data; 436 437 /* drop batman-in-batman packets to prevent loops */ 438 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) 439 break; 440 441 /* fall through */ 442 case ETH_P_BATMAN: 443 goto dropped; 444 } 445 446 /* skb->dev & skb->pkt_type are set here */ 447 skb->protocol = eth_type_trans(skb, soft_iface); 448 449 /* should not be necessary anymore as we use skb_pull_rcsum() 450 * TODO: please verify this and remove this TODO 451 * -- Dec 21st 2009, Simon Wunderlich 452 */ 453 454 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ 455 456 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 457 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 458 skb->len + ETH_HLEN); 459 460 soft_iface->last_rx = jiffies; 461 462 /* Let the bridge loop avoidance check the packet. If will 463 * not handle it, we can safely push it up. 464 */ 465 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 466 goto out; 467 468 if (orig_node) 469 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 470 ethhdr->h_source, vid); 471 472 if (is_multicast_ether_addr(ethhdr->h_dest)) { 473 /* set the mark on broadcast packets if AP isolation is ON and 474 * the packet is coming from an "isolated" client 475 */ 476 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 477 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 478 vid)) { 479 /* save bits in skb->mark not covered by the mask and 480 * apply the mark on the rest 481 */ 482 skb->mark &= ~bat_priv->isolation_mark_mask; 483 skb->mark |= bat_priv->isolation_mark; 484 } 485 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 486 ethhdr->h_dest, vid)) { 487 goto dropped; 488 } 489 490 netif_rx(skb); 491 goto out; 492 493 dropped: 494 kfree_skb(skb); 495 out: 496 return; 497 } 498 499 /** 500 * batadv_softif_vlan_release - release vlan from lists and queue for free after 501 * rcu grace period 502 * @ref: kref pointer of the vlan object 503 */ 504 static void batadv_softif_vlan_release(struct kref *ref) 505 { 506 struct batadv_softif_vlan *vlan; 507 508 vlan = container_of(ref, struct batadv_softif_vlan, refcount); 509 510 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 511 hlist_del_rcu(&vlan->list); 512 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 513 514 kfree_rcu(vlan, rcu); 515 } 516 517 /** 518 * batadv_softif_vlan_put - decrease the vlan object refcounter and 519 * possibly release it 520 * @vlan: the vlan object to release 521 */ 522 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan) 523 { 524 if (!vlan) 525 return; 526 527 kref_put(&vlan->refcount, batadv_softif_vlan_release); 528 } 529 530 /** 531 * batadv_softif_vlan_get - get the vlan object for a specific vid 532 * @bat_priv: the bat priv with all the soft interface information 533 * @vid: the identifier of the vlan object to retrieve 534 * 535 * Return: the private data of the vlan matching the vid passed as argument or 536 * NULL otherwise. The refcounter of the returned object is incremented by 1. 537 */ 538 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 539 unsigned short vid) 540 { 541 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 542 543 rcu_read_lock(); 544 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 545 if (vlan_tmp->vid != vid) 546 continue; 547 548 if (!kref_get_unless_zero(&vlan_tmp->refcount)) 549 continue; 550 551 vlan = vlan_tmp; 552 break; 553 } 554 rcu_read_unlock(); 555 556 return vlan; 557 } 558 559 /** 560 * batadv_softif_create_vlan - allocate the needed resources for a new vlan 561 * @bat_priv: the bat priv with all the soft interface information 562 * @vid: the VLAN identifier 563 * 564 * Return: 0 on success, a negative error otherwise. 565 */ 566 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 567 { 568 struct batadv_softif_vlan *vlan; 569 int err; 570 571 vlan = batadv_softif_vlan_get(bat_priv, vid); 572 if (vlan) { 573 batadv_softif_vlan_put(vlan); 574 return -EEXIST; 575 } 576 577 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 578 if (!vlan) 579 return -ENOMEM; 580 581 vlan->bat_priv = bat_priv; 582 vlan->vid = vid; 583 kref_init(&vlan->refcount); 584 585 atomic_set(&vlan->ap_isolation, 0); 586 587 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 588 if (err) { 589 kfree(vlan); 590 return err; 591 } 592 593 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 594 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 595 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 596 597 /* add a new TT local entry. This one will be marked with the NOPURGE 598 * flag 599 */ 600 batadv_tt_local_add(bat_priv->soft_iface, 601 bat_priv->soft_iface->dev_addr, vid, 602 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 603 604 return 0; 605 } 606 607 /** 608 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object 609 * @bat_priv: the bat priv with all the soft interface information 610 * @vlan: the object to remove 611 */ 612 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 613 struct batadv_softif_vlan *vlan) 614 { 615 /* explicitly remove the associated TT local entry because it is marked 616 * with the NOPURGE flag 617 */ 618 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 619 vlan->vid, "vlan interface destroyed", false); 620 621 batadv_sysfs_del_vlan(bat_priv, vlan); 622 batadv_softif_vlan_put(vlan); 623 } 624 625 /** 626 * batadv_interface_add_vid - ndo_add_vid API implementation 627 * @dev: the netdev of the mesh interface 628 * @proto: protocol of the the vlan id 629 * @vid: identifier of the new vlan 630 * 631 * Set up all the internal structures for handling the new vlan on top of the 632 * mesh interface 633 * 634 * Return: 0 on success or a negative error code in case of failure. 635 */ 636 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 637 unsigned short vid) 638 { 639 struct batadv_priv *bat_priv = netdev_priv(dev); 640 struct batadv_softif_vlan *vlan; 641 int ret; 642 643 /* only 802.1Q vlans are supported. 644 * batman-adv does not know how to handle other types 645 */ 646 if (proto != htons(ETH_P_8021Q)) 647 return -EINVAL; 648 649 vid |= BATADV_VLAN_HAS_TAG; 650 651 /* if a new vlan is getting created and it already exists, it means that 652 * it was not deleted yet. batadv_softif_vlan_get() increases the 653 * refcount in order to revive the object. 654 * 655 * if it does not exist then create it. 656 */ 657 vlan = batadv_softif_vlan_get(bat_priv, vid); 658 if (!vlan) 659 return batadv_softif_create_vlan(bat_priv, vid); 660 661 /* recreate the sysfs object if it was already destroyed (and it should 662 * be since we received a kill_vid() for this vlan 663 */ 664 if (!vlan->kobj) { 665 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 666 if (ret) { 667 batadv_softif_vlan_put(vlan); 668 return ret; 669 } 670 } 671 672 /* add a new TT local entry. This one will be marked with the NOPURGE 673 * flag. This must be added again, even if the vlan object already 674 * exists, because the entry was deleted by kill_vid() 675 */ 676 batadv_tt_local_add(bat_priv->soft_iface, 677 bat_priv->soft_iface->dev_addr, vid, 678 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 679 680 return 0; 681 } 682 683 /** 684 * batadv_interface_kill_vid - ndo_kill_vid API implementation 685 * @dev: the netdev of the mesh interface 686 * @proto: protocol of the the vlan id 687 * @vid: identifier of the deleted vlan 688 * 689 * Destroy all the internal structures used to handle the vlan identified by vid 690 * on top of the mesh interface 691 * 692 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 693 * or -ENOENT if the specified vlan id wasn't registered. 694 */ 695 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 696 unsigned short vid) 697 { 698 struct batadv_priv *bat_priv = netdev_priv(dev); 699 struct batadv_softif_vlan *vlan; 700 701 /* only 802.1Q vlans are supported. batman-adv does not know how to 702 * handle other types 703 */ 704 if (proto != htons(ETH_P_8021Q)) 705 return -EINVAL; 706 707 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 708 if (!vlan) 709 return -ENOENT; 710 711 batadv_softif_destroy_vlan(bat_priv, vlan); 712 713 /* finally free the vlan object */ 714 batadv_softif_vlan_put(vlan); 715 716 return 0; 717 } 718 719 /* batman-adv network devices have devices nesting below it and are a special 720 * "super class" of normal network devices; split their locks off into a 721 * separate class since they always nest. 722 */ 723 static struct lock_class_key batadv_netdev_xmit_lock_key; 724 static struct lock_class_key batadv_netdev_addr_lock_key; 725 726 /** 727 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue 728 * @dev: device which owns the tx queue 729 * @txq: tx queue to modify 730 * @_unused: always NULL 731 */ 732 static void batadv_set_lockdep_class_one(struct net_device *dev, 733 struct netdev_queue *txq, 734 void *_unused) 735 { 736 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 737 } 738 739 /** 740 * batadv_set_lockdep_class - Set txq and addr_list lockdep class 741 * @dev: network device to modify 742 */ 743 static void batadv_set_lockdep_class(struct net_device *dev) 744 { 745 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 746 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 747 } 748 749 /** 750 * batadv_softif_destroy_finish - cleans up the remains of a softif 751 * @work: work queue item 752 * 753 * Free the parts of the soft interface which can not be removed under 754 * rtnl lock (to prevent deadlock situations). 755 */ 756 static void batadv_softif_destroy_finish(struct work_struct *work) 757 { 758 struct batadv_softif_vlan *vlan; 759 struct batadv_priv *bat_priv; 760 struct net_device *soft_iface; 761 762 bat_priv = container_of(work, struct batadv_priv, 763 cleanup_work); 764 soft_iface = bat_priv->soft_iface; 765 766 /* destroy the "untagged" VLAN */ 767 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 768 if (vlan) { 769 batadv_softif_destroy_vlan(bat_priv, vlan); 770 batadv_softif_vlan_put(vlan); 771 } 772 773 batadv_sysfs_del_meshif(soft_iface); 774 unregister_netdev(soft_iface); 775 } 776 777 /** 778 * batadv_softif_init_late - late stage initialization of soft interface 779 * @dev: registered network device to modify 780 * 781 * Return: error code on failures 782 */ 783 static int batadv_softif_init_late(struct net_device *dev) 784 { 785 struct batadv_priv *bat_priv; 786 u32 random_seqno; 787 int ret; 788 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 789 790 batadv_set_lockdep_class(dev); 791 792 bat_priv = netdev_priv(dev); 793 bat_priv->soft_iface = dev; 794 INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish); 795 796 /* batadv_interface_stats() needs to be available as soon as 797 * register_netdevice() has been called 798 */ 799 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 800 if (!bat_priv->bat_counters) 801 return -ENOMEM; 802 803 atomic_set(&bat_priv->aggregated_ogms, 1); 804 atomic_set(&bat_priv->bonding, 0); 805 #ifdef CONFIG_BATMAN_ADV_BLA 806 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 807 #endif 808 #ifdef CONFIG_BATMAN_ADV_DAT 809 atomic_set(&bat_priv->distributed_arp_table, 1); 810 #endif 811 #ifdef CONFIG_BATMAN_ADV_MCAST 812 bat_priv->mcast.querier_ipv4.exists = false; 813 bat_priv->mcast.querier_ipv4.shadowing = false; 814 bat_priv->mcast.querier_ipv6.exists = false; 815 bat_priv->mcast.querier_ipv6.shadowing = false; 816 bat_priv->mcast.flags = BATADV_NO_FLAGS; 817 atomic_set(&bat_priv->multicast_mode, 1); 818 atomic_set(&bat_priv->mcast.num_disabled, 0); 819 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 820 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 821 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 822 #endif 823 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); 824 atomic_set(&bat_priv->gw.sel_class, 20); 825 atomic_set(&bat_priv->gw.bandwidth_down, 100); 826 atomic_set(&bat_priv->gw.bandwidth_up, 20); 827 atomic_set(&bat_priv->orig_interval, 1000); 828 atomic_set(&bat_priv->hop_penalty, 30); 829 #ifdef CONFIG_BATMAN_ADV_DEBUG 830 atomic_set(&bat_priv->log_level, 0); 831 #endif 832 atomic_set(&bat_priv->fragmentation, 1); 833 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 834 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 835 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 836 837 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 838 atomic_set(&bat_priv->bcast_seqno, 1); 839 atomic_set(&bat_priv->tt.vn, 0); 840 atomic_set(&bat_priv->tt.local_changes, 0); 841 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 842 #ifdef CONFIG_BATMAN_ADV_BLA 843 atomic_set(&bat_priv->bla.num_requests, 0); 844 #endif 845 atomic_set(&bat_priv->tp_num, 0); 846 847 bat_priv->tt.last_changeset = NULL; 848 bat_priv->tt.last_changeset_len = 0; 849 bat_priv->isolation_mark = 0; 850 bat_priv->isolation_mark_mask = 0; 851 852 /* randomize initial seqno to avoid collision */ 853 get_random_bytes(&random_seqno, sizeof(random_seqno)); 854 atomic_set(&bat_priv->frag_seqno, random_seqno); 855 856 bat_priv->primary_if = NULL; 857 bat_priv->num_ifaces = 0; 858 859 batadv_nc_init_bat_priv(bat_priv); 860 861 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 862 if (ret < 0) 863 goto free_bat_counters; 864 865 ret = batadv_debugfs_add_meshif(dev); 866 if (ret < 0) 867 goto free_bat_counters; 868 869 ret = batadv_mesh_init(dev); 870 if (ret < 0) 871 goto unreg_debugfs; 872 873 return 0; 874 875 unreg_debugfs: 876 batadv_debugfs_del_meshif(dev); 877 free_bat_counters: 878 free_percpu(bat_priv->bat_counters); 879 bat_priv->bat_counters = NULL; 880 881 return ret; 882 } 883 884 /** 885 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface 886 * @dev: batadv_soft_interface used as master interface 887 * @slave_dev: net_device which should become the slave interface 888 * 889 * Return: 0 if successful or error otherwise. 890 */ 891 static int batadv_softif_slave_add(struct net_device *dev, 892 struct net_device *slave_dev) 893 { 894 struct batadv_hard_iface *hard_iface; 895 struct net *net = dev_net(dev); 896 int ret = -EINVAL; 897 898 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 899 if (!hard_iface || hard_iface->soft_iface) 900 goto out; 901 902 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name); 903 904 out: 905 if (hard_iface) 906 batadv_hardif_put(hard_iface); 907 return ret; 908 } 909 910 /** 911 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface 912 * @dev: batadv_soft_interface used as master interface 913 * @slave_dev: net_device which should be removed from the master interface 914 * 915 * Return: 0 if successful or error otherwise. 916 */ 917 static int batadv_softif_slave_del(struct net_device *dev, 918 struct net_device *slave_dev) 919 { 920 struct batadv_hard_iface *hard_iface; 921 int ret = -EINVAL; 922 923 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 924 925 if (!hard_iface || hard_iface->soft_iface != dev) 926 goto out; 927 928 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 929 ret = 0; 930 931 out: 932 if (hard_iface) 933 batadv_hardif_put(hard_iface); 934 return ret; 935 } 936 937 static const struct net_device_ops batadv_netdev_ops = { 938 .ndo_init = batadv_softif_init_late, 939 .ndo_open = batadv_interface_open, 940 .ndo_stop = batadv_interface_release, 941 .ndo_get_stats = batadv_interface_stats, 942 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 943 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 944 .ndo_set_mac_address = batadv_interface_set_mac_addr, 945 .ndo_change_mtu = batadv_interface_change_mtu, 946 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 947 .ndo_start_xmit = batadv_interface_tx, 948 .ndo_validate_addr = eth_validate_addr, 949 .ndo_add_slave = batadv_softif_slave_add, 950 .ndo_del_slave = batadv_softif_slave_del, 951 }; 952 953 /** 954 * batadv_softif_free - Deconstructor of batadv_soft_interface 955 * @dev: Device to cleanup and remove 956 */ 957 static void batadv_softif_free(struct net_device *dev) 958 { 959 batadv_debugfs_del_meshif(dev); 960 batadv_mesh_free(dev); 961 962 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 963 * their tasks. Wait for them all to be finished before freeing the 964 * netdev and its private data (bat_priv) 965 */ 966 rcu_barrier(); 967 968 free_netdev(dev); 969 } 970 971 /** 972 * batadv_softif_init_early - early stage initialization of soft interface 973 * @dev: registered network device to modify 974 */ 975 static void batadv_softif_init_early(struct net_device *dev) 976 { 977 struct batadv_priv *priv = netdev_priv(dev); 978 979 ether_setup(dev); 980 981 dev->netdev_ops = &batadv_netdev_ops; 982 dev->destructor = batadv_softif_free; 983 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; 984 dev->priv_flags |= IFF_NO_QUEUE; 985 986 /* can't call min_mtu, because the needed variables 987 * have not been initialized yet 988 */ 989 dev->mtu = ETH_DATA_LEN; 990 991 /* generate random address */ 992 eth_hw_addr_random(dev); 993 994 dev->ethtool_ops = &batadv_ethtool_ops; 995 996 memset(priv, 0, sizeof(*priv)); 997 } 998 999 struct net_device *batadv_softif_create(struct net *net, const char *name) 1000 { 1001 struct net_device *soft_iface; 1002 int ret; 1003 1004 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 1005 NET_NAME_UNKNOWN, batadv_softif_init_early); 1006 if (!soft_iface) 1007 return NULL; 1008 1009 dev_net_set(soft_iface, net); 1010 1011 soft_iface->rtnl_link_ops = &batadv_link_ops; 1012 1013 ret = register_netdevice(soft_iface); 1014 if (ret < 0) { 1015 pr_err("Unable to register the batman interface '%s': %i\n", 1016 name, ret); 1017 free_netdev(soft_iface); 1018 return NULL; 1019 } 1020 1021 return soft_iface; 1022 } 1023 1024 /** 1025 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs 1026 * @soft_iface: the to-be-removed batman-adv interface 1027 */ 1028 void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 1029 { 1030 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1031 1032 queue_work(batadv_event_workqueue, &bat_priv->cleanup_work); 1033 } 1034 1035 /** 1036 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink 1037 * @soft_iface: the to-be-removed batman-adv interface 1038 * @head: list pointer 1039 */ 1040 static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1041 struct list_head *head) 1042 { 1043 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1044 struct batadv_hard_iface *hard_iface; 1045 struct batadv_softif_vlan *vlan; 1046 1047 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1048 if (hard_iface->soft_iface == soft_iface) 1049 batadv_hardif_disable_interface(hard_iface, 1050 BATADV_IF_CLEANUP_KEEP); 1051 } 1052 1053 /* destroy the "untagged" VLAN */ 1054 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1055 if (vlan) { 1056 batadv_softif_destroy_vlan(bat_priv, vlan); 1057 batadv_softif_vlan_put(vlan); 1058 } 1059 1060 batadv_sysfs_del_meshif(soft_iface); 1061 unregister_netdevice_queue(soft_iface, head); 1062 } 1063 1064 bool batadv_softif_is_valid(const struct net_device *net_dev) 1065 { 1066 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1067 return true; 1068 1069 return false; 1070 } 1071 1072 struct rtnl_link_ops batadv_link_ops __read_mostly = { 1073 .kind = "batadv", 1074 .priv_size = sizeof(struct batadv_priv), 1075 .setup = batadv_softif_init_early, 1076 .dellink = batadv_softif_destroy_netlink, 1077 }; 1078 1079 /* ethtool */ 1080 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1081 { 1082 cmd->supported = 0; 1083 cmd->advertising = 0; 1084 ethtool_cmd_speed_set(cmd, SPEED_10); 1085 cmd->duplex = DUPLEX_FULL; 1086 cmd->port = PORT_TP; 1087 cmd->phy_address = 0; 1088 cmd->transceiver = XCVR_INTERNAL; 1089 cmd->autoneg = AUTONEG_DISABLE; 1090 cmd->maxtxpkt = 0; 1091 cmd->maxrxpkt = 0; 1092 1093 return 0; 1094 } 1095 1096 static void batadv_get_drvinfo(struct net_device *dev, 1097 struct ethtool_drvinfo *info) 1098 { 1099 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 1100 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 1101 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 1102 strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); 1103 } 1104 1105 static u32 batadv_get_msglevel(struct net_device *dev) 1106 { 1107 return -EOPNOTSUPP; 1108 } 1109 1110 static void batadv_set_msglevel(struct net_device *dev, u32 value) 1111 { 1112 } 1113 1114 static u32 batadv_get_link(struct net_device *dev) 1115 { 1116 return 1; 1117 } 1118 1119 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 1120 * Declare each description string in struct.name[] to get fixed sized buffer 1121 * and compile time checking for strings longer than ETH_GSTRING_LEN. 1122 */ 1123 static const struct { 1124 const char name[ETH_GSTRING_LEN]; 1125 } batadv_counters_strings[] = { 1126 { "tx" }, 1127 { "tx_bytes" }, 1128 { "tx_dropped" }, 1129 { "rx" }, 1130 { "rx_bytes" }, 1131 { "forward" }, 1132 { "forward_bytes" }, 1133 { "mgmt_tx" }, 1134 { "mgmt_tx_bytes" }, 1135 { "mgmt_rx" }, 1136 { "mgmt_rx_bytes" }, 1137 { "frag_tx" }, 1138 { "frag_tx_bytes" }, 1139 { "frag_rx" }, 1140 { "frag_rx_bytes" }, 1141 { "frag_fwd" }, 1142 { "frag_fwd_bytes" }, 1143 { "tt_request_tx" }, 1144 { "tt_request_rx" }, 1145 { "tt_response_tx" }, 1146 { "tt_response_rx" }, 1147 { "tt_roam_adv_tx" }, 1148 { "tt_roam_adv_rx" }, 1149 #ifdef CONFIG_BATMAN_ADV_DAT 1150 { "dat_get_tx" }, 1151 { "dat_get_rx" }, 1152 { "dat_put_tx" }, 1153 { "dat_put_rx" }, 1154 { "dat_cached_reply_tx" }, 1155 #endif 1156 #ifdef CONFIG_BATMAN_ADV_NC 1157 { "nc_code" }, 1158 { "nc_code_bytes" }, 1159 { "nc_recode" }, 1160 { "nc_recode_bytes" }, 1161 { "nc_buffer" }, 1162 { "nc_decode" }, 1163 { "nc_decode_bytes" }, 1164 { "nc_decode_failed" }, 1165 { "nc_sniffed" }, 1166 #endif 1167 }; 1168 1169 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 1170 { 1171 if (stringset == ETH_SS_STATS) 1172 memcpy(data, batadv_counters_strings, 1173 sizeof(batadv_counters_strings)); 1174 } 1175 1176 static void batadv_get_ethtool_stats(struct net_device *dev, 1177 struct ethtool_stats *stats, u64 *data) 1178 { 1179 struct batadv_priv *bat_priv = netdev_priv(dev); 1180 int i; 1181 1182 for (i = 0; i < BATADV_CNT_NUM; i++) 1183 data[i] = batadv_sum_counter(bat_priv, i); 1184 } 1185 1186 static int batadv_get_sset_count(struct net_device *dev, int stringset) 1187 { 1188 if (stringset == ETH_SS_STATS) 1189 return BATADV_CNT_NUM; 1190 1191 return -EOPNOTSUPP; 1192 } 1193