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/cpumask.h> 26 #include <linux/errno.h> 27 #include <linux/etherdevice.h> 28 #include <linux/ethtool.h> 29 #include <linux/fs.h> 30 #include <linux/if_ether.h> 31 #include <linux/if_vlan.h> 32 #include <linux/jiffies.h> 33 #include <linux/kernel.h> 34 #include <linux/kref.h> 35 #include <linux/list.h> 36 #include <linux/lockdep.h> 37 #include <linux/netdevice.h> 38 #include <linux/percpu.h> 39 #include <linux/printk.h> 40 #include <linux/random.h> 41 #include <linux/rculist.h> 42 #include <linux/rcupdate.h> 43 #include <linux/rtnetlink.h> 44 #include <linux/skbuff.h> 45 #include <linux/slab.h> 46 #include <linux/socket.h> 47 #include <linux/spinlock.h> 48 #include <linux/stddef.h> 49 #include <linux/string.h> 50 #include <linux/types.h> 51 52 #include "bat_algo.h" 53 #include "bridge_loop_avoidance.h" 54 #include "debugfs.h" 55 #include "distributed-arp-table.h" 56 #include "gateway_client.h" 57 #include "gateway_common.h" 58 #include "hard-interface.h" 59 #include "multicast.h" 60 #include "network-coding.h" 61 #include "originator.h" 62 #include "packet.h" 63 #include "send.h" 64 #include "sysfs.h" 65 #include "translation-table.h" 66 67 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd); 68 static void batadv_get_drvinfo(struct net_device *dev, 69 struct ethtool_drvinfo *info); 70 static u32 batadv_get_msglevel(struct net_device *dev); 71 static void batadv_set_msglevel(struct net_device *dev, u32 value); 72 static u32 batadv_get_link(struct net_device *dev); 73 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data); 74 static void batadv_get_ethtool_stats(struct net_device *dev, 75 struct ethtool_stats *stats, u64 *data); 76 static int batadv_get_sset_count(struct net_device *dev, int stringset); 77 78 static const struct ethtool_ops batadv_ethtool_ops = { 79 .get_settings = batadv_get_settings, 80 .get_drvinfo = batadv_get_drvinfo, 81 .get_msglevel = batadv_get_msglevel, 82 .set_msglevel = batadv_set_msglevel, 83 .get_link = batadv_get_link, 84 .get_strings = batadv_get_strings, 85 .get_ethtool_stats = batadv_get_ethtool_stats, 86 .get_sset_count = batadv_get_sset_count, 87 }; 88 89 int batadv_skb_head_push(struct sk_buff *skb, unsigned int len) 90 { 91 int result; 92 93 /* TODO: We must check if we can release all references to non-payload 94 * data using skb_header_release in our skbs to allow skb_cow_header to 95 * work optimally. This means that those skbs are not allowed to read 96 * or write any data which is before the current position of skb->data 97 * after that call and thus allow other skbs with the same data buffer 98 * to write freely in that area. 99 */ 100 result = skb_cow_head(skb, len); 101 if (result < 0) 102 return result; 103 104 skb_push(skb, len); 105 return 0; 106 } 107 108 static int batadv_interface_open(struct net_device *dev) 109 { 110 netif_start_queue(dev); 111 return 0; 112 } 113 114 static int batadv_interface_release(struct net_device *dev) 115 { 116 netif_stop_queue(dev); 117 return 0; 118 } 119 120 /** 121 * batadv_sum_counter - Sum the cpu-local counters for index 'idx' 122 * @bat_priv: the bat priv with all the soft interface information 123 * @idx: index of counter to sum up 124 * 125 * Return: sum of all cpu-local counters 126 */ 127 static u64 batadv_sum_counter(struct batadv_priv *bat_priv, size_t idx) 128 { 129 u64 *counters, sum = 0; 130 int cpu; 131 132 for_each_possible_cpu(cpu) { 133 counters = per_cpu_ptr(bat_priv->bat_counters, cpu); 134 sum += counters[idx]; 135 } 136 137 return sum; 138 } 139 140 static struct net_device_stats *batadv_interface_stats(struct net_device *dev) 141 { 142 struct batadv_priv *bat_priv = netdev_priv(dev); 143 struct net_device_stats *stats = &bat_priv->stats; 144 145 stats->tx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_TX); 146 stats->tx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_TX_BYTES); 147 stats->tx_dropped = batadv_sum_counter(bat_priv, BATADV_CNT_TX_DROPPED); 148 stats->rx_packets = batadv_sum_counter(bat_priv, BATADV_CNT_RX); 149 stats->rx_bytes = batadv_sum_counter(bat_priv, BATADV_CNT_RX_BYTES); 150 return stats; 151 } 152 153 static int batadv_interface_set_mac_addr(struct net_device *dev, void *p) 154 { 155 struct batadv_priv *bat_priv = netdev_priv(dev); 156 struct batadv_softif_vlan *vlan; 157 struct sockaddr *addr = p; 158 u8 old_addr[ETH_ALEN]; 159 160 if (!is_valid_ether_addr(addr->sa_data)) 161 return -EADDRNOTAVAIL; 162 163 ether_addr_copy(old_addr, dev->dev_addr); 164 ether_addr_copy(dev->dev_addr, addr->sa_data); 165 166 /* only modify transtable if it has been initialized before */ 167 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 168 return 0; 169 170 rcu_read_lock(); 171 hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { 172 batadv_tt_local_remove(bat_priv, old_addr, vlan->vid, 173 "mac address changed", false); 174 batadv_tt_local_add(dev, addr->sa_data, vlan->vid, 175 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 176 } 177 rcu_read_unlock(); 178 179 return 0; 180 } 181 182 static int batadv_interface_change_mtu(struct net_device *dev, int new_mtu) 183 { 184 /* check ranges */ 185 if ((new_mtu < 68) || (new_mtu > batadv_hardif_min_mtu(dev))) 186 return -EINVAL; 187 188 dev->mtu = new_mtu; 189 190 return 0; 191 } 192 193 /** 194 * batadv_interface_set_rx_mode - set the rx mode of a device 195 * @dev: registered network device to modify 196 * 197 * We do not actually need to set any rx filters for the virtual batman 198 * soft interface. However a dummy handler enables a user to set static 199 * multicast listeners for instance. 200 */ 201 static void batadv_interface_set_rx_mode(struct net_device *dev) 202 { 203 } 204 205 static int batadv_interface_tx(struct sk_buff *skb, 206 struct net_device *soft_iface) 207 { 208 struct ethhdr *ethhdr; 209 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 210 struct batadv_hard_iface *primary_if = NULL; 211 struct batadv_bcast_packet *bcast_packet; 212 static const u8 stp_addr[ETH_ALEN] = {0x01, 0x80, 0xC2, 0x00, 213 0x00, 0x00}; 214 static const u8 ectp_addr[ETH_ALEN] = {0xCF, 0x00, 0x00, 0x00, 215 0x00, 0x00}; 216 enum batadv_dhcp_recipient dhcp_rcp = BATADV_DHCP_NO; 217 u8 *dst_hint = NULL, chaddr[ETH_ALEN]; 218 struct vlan_ethhdr *vhdr; 219 unsigned int header_len = 0; 220 int data_len = skb->len, ret; 221 unsigned long brd_delay = 1; 222 bool do_bcast = false, client_added; 223 unsigned short vid; 224 u32 seqno; 225 int gw_mode; 226 enum batadv_forw_mode forw_mode; 227 struct batadv_orig_node *mcast_single_orig = NULL; 228 int network_offset = ETH_HLEN; 229 230 if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) 231 goto dropped; 232 233 netif_trans_update(soft_iface); 234 vid = batadv_get_vid(skb, 0); 235 ethhdr = eth_hdr(skb); 236 237 switch (ntohs(ethhdr->h_proto)) { 238 case ETH_P_8021Q: 239 vhdr = vlan_eth_hdr(skb); 240 241 /* drop batman-in-batman packets to prevent loops */ 242 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) { 243 network_offset += VLAN_HLEN; 244 break; 245 } 246 247 /* fall through */ 248 case ETH_P_BATMAN: 249 goto dropped; 250 } 251 252 skb_set_network_header(skb, network_offset); 253 254 if (batadv_bla_tx(bat_priv, skb, vid)) 255 goto dropped; 256 257 /* skb->data might have been reallocated by batadv_bla_tx() */ 258 ethhdr = eth_hdr(skb); 259 260 /* Register the client MAC in the transtable */ 261 if (!is_multicast_ether_addr(ethhdr->h_source)) { 262 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 263 vid, skb->skb_iif, 264 skb->mark); 265 if (!client_added) 266 goto dropped; 267 } 268 269 /* don't accept stp packets. STP does not help in meshes. 270 * better use the bridge loop avoidance ... 271 * 272 * The same goes for ECTP sent at least by some Cisco Switches, 273 * it might confuse the mesh when used with bridge loop avoidance. 274 */ 275 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 276 goto dropped; 277 278 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 279 goto dropped; 280 281 gw_mode = atomic_read(&bat_priv->gw.mode); 282 if (is_multicast_ether_addr(ethhdr->h_dest)) { 283 /* if gw mode is off, broadcast every packet */ 284 if (gw_mode == BATADV_GW_MODE_OFF) { 285 do_bcast = true; 286 goto send; 287 } 288 289 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 290 chaddr); 291 /* skb->data may have been modified by 292 * batadv_gw_dhcp_recipient_get() 293 */ 294 ethhdr = eth_hdr(skb); 295 /* if gw_mode is on, broadcast any non-DHCP message. 296 * All the DHCP packets are going to be sent as unicast 297 */ 298 if (dhcp_rcp == BATADV_DHCP_NO) { 299 do_bcast = true; 300 goto send; 301 } 302 303 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 304 dst_hint = chaddr; 305 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 306 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 307 /* gateways should not forward any DHCP message if 308 * directed to a DHCP server 309 */ 310 goto dropped; 311 312 send: 313 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 314 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 315 &mcast_single_orig); 316 if (forw_mode == BATADV_FORW_NONE) 317 goto dropped; 318 319 if (forw_mode == BATADV_FORW_SINGLE) 320 do_bcast = false; 321 } 322 } 323 324 batadv_skb_set_priority(skb, 0); 325 326 /* ethernet packet should be broadcasted */ 327 if (do_bcast) { 328 primary_if = batadv_primary_if_get_selected(bat_priv); 329 if (!primary_if) 330 goto dropped; 331 332 /* in case of ARP request, we do not immediately broadcasti the 333 * packet, instead we first wait for DAT to try to retrieve the 334 * correct ARP entry 335 */ 336 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 337 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 338 339 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 340 goto dropped; 341 342 bcast_packet = (struct batadv_bcast_packet *)skb->data; 343 bcast_packet->version = BATADV_COMPAT_VERSION; 344 bcast_packet->ttl = BATADV_TTL; 345 346 /* batman packet type: broadcast */ 347 bcast_packet->packet_type = BATADV_BCAST; 348 bcast_packet->reserved = 0; 349 350 /* hw address of first interface is the orig mac because only 351 * this mac is known throughout the mesh 352 */ 353 ether_addr_copy(bcast_packet->orig, 354 primary_if->net_dev->dev_addr); 355 356 /* set broadcast sequence number */ 357 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 358 bcast_packet->seqno = htonl(seqno); 359 360 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true); 361 362 /* a copy is stored in the bcast list, therefore removing 363 * the original skb. 364 */ 365 consume_skb(skb); 366 367 /* unicast packet */ 368 } else { 369 /* DHCP packets going to a server will use the GW feature */ 370 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 371 ret = batadv_gw_out_of_range(bat_priv, skb); 372 if (ret) 373 goto dropped; 374 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 375 } else if (mcast_single_orig) { 376 ret = batadv_send_skb_unicast(bat_priv, skb, 377 BATADV_UNICAST, 0, 378 mcast_single_orig, vid); 379 } else { 380 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 381 skb)) 382 goto dropped; 383 384 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 385 386 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 387 vid); 388 } 389 if (ret != NET_XMIT_SUCCESS) 390 goto dropped_freed; 391 } 392 393 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 394 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 395 goto end; 396 397 dropped: 398 kfree_skb(skb); 399 dropped_freed: 400 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 401 end: 402 if (mcast_single_orig) 403 batadv_orig_node_put(mcast_single_orig); 404 if (primary_if) 405 batadv_hardif_put(primary_if); 406 return NETDEV_TX_OK; 407 } 408 409 /** 410 * batadv_interface_rx - receive ethernet frame on local batman-adv interface 411 * @soft_iface: local interface which will receive the ethernet frame 412 * @skb: ethernet frame for @soft_iface 413 * @hdr_size: size of already parsed batman-adv header 414 * @orig_node: originator from which the batman-adv packet was sent 415 * 416 * Sends a ethernet frame to the receive path of the local @soft_iface. 417 * skb->data has still point to the batman-adv header with the size @hdr_size. 418 * The caller has to have parsed this header already and made sure that at least 419 * @hdr_size bytes are still available for pull in @skb. 420 * 421 * The packet may still get dropped. This can happen when the encapsulated 422 * ethernet frame is invalid or contains again an batman-adv packet. Also 423 * unicast packets will be dropped directly when it was sent between two 424 * isolated clients. 425 */ 426 void batadv_interface_rx(struct net_device *soft_iface, 427 struct sk_buff *skb, int hdr_size, 428 struct batadv_orig_node *orig_node) 429 { 430 struct batadv_bcast_packet *batadv_bcast_packet; 431 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 432 struct vlan_ethhdr *vhdr; 433 struct ethhdr *ethhdr; 434 unsigned short vid; 435 bool is_bcast; 436 437 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 438 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 439 440 skb_pull_rcsum(skb, hdr_size); 441 skb_reset_mac_header(skb); 442 443 /* clean the netfilter state now that the batman-adv header has been 444 * removed 445 */ 446 nf_reset(skb); 447 448 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 449 goto dropped; 450 451 vid = batadv_get_vid(skb, 0); 452 ethhdr = eth_hdr(skb); 453 454 switch (ntohs(ethhdr->h_proto)) { 455 case ETH_P_8021Q: 456 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 457 goto dropped; 458 459 vhdr = (struct vlan_ethhdr *)skb->data; 460 461 /* drop batman-in-batman packets to prevent loops */ 462 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) 463 break; 464 465 /* fall through */ 466 case ETH_P_BATMAN: 467 goto dropped; 468 } 469 470 /* skb->dev & skb->pkt_type are set here */ 471 skb->protocol = eth_type_trans(skb, soft_iface); 472 473 /* should not be necessary anymore as we use skb_pull_rcsum() 474 * TODO: please verify this and remove this TODO 475 * -- Dec 21st 2009, Simon Wunderlich 476 */ 477 478 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ 479 480 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 481 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 482 skb->len + ETH_HLEN); 483 484 soft_iface->last_rx = jiffies; 485 486 /* Let the bridge loop avoidance check the packet. If will 487 * not handle it, we can safely push it up. 488 */ 489 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 490 goto out; 491 492 if (orig_node) 493 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 494 ethhdr->h_source, vid); 495 496 if (is_multicast_ether_addr(ethhdr->h_dest)) { 497 /* set the mark on broadcast packets if AP isolation is ON and 498 * the packet is coming from an "isolated" client 499 */ 500 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 501 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 502 vid)) { 503 /* save bits in skb->mark not covered by the mask and 504 * apply the mark on the rest 505 */ 506 skb->mark &= ~bat_priv->isolation_mark_mask; 507 skb->mark |= bat_priv->isolation_mark; 508 } 509 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 510 ethhdr->h_dest, vid)) { 511 goto dropped; 512 } 513 514 netif_rx(skb); 515 goto out; 516 517 dropped: 518 kfree_skb(skb); 519 out: 520 return; 521 } 522 523 /** 524 * batadv_softif_vlan_release - release vlan from lists and queue for free after 525 * rcu grace period 526 * @ref: kref pointer of the vlan object 527 */ 528 static void batadv_softif_vlan_release(struct kref *ref) 529 { 530 struct batadv_softif_vlan *vlan; 531 532 vlan = container_of(ref, struct batadv_softif_vlan, refcount); 533 534 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 535 hlist_del_rcu(&vlan->list); 536 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 537 538 kfree_rcu(vlan, rcu); 539 } 540 541 /** 542 * batadv_softif_vlan_put - decrease the vlan object refcounter and 543 * possibly release it 544 * @vlan: the vlan object to release 545 */ 546 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan) 547 { 548 if (!vlan) 549 return; 550 551 kref_put(&vlan->refcount, batadv_softif_vlan_release); 552 } 553 554 /** 555 * batadv_softif_vlan_get - get the vlan object for a specific vid 556 * @bat_priv: the bat priv with all the soft interface information 557 * @vid: the identifier of the vlan object to retrieve 558 * 559 * Return: the private data of the vlan matching the vid passed as argument or 560 * NULL otherwise. The refcounter of the returned object is incremented by 1. 561 */ 562 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 563 unsigned short vid) 564 { 565 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 566 567 rcu_read_lock(); 568 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 569 if (vlan_tmp->vid != vid) 570 continue; 571 572 if (!kref_get_unless_zero(&vlan_tmp->refcount)) 573 continue; 574 575 vlan = vlan_tmp; 576 break; 577 } 578 rcu_read_unlock(); 579 580 return vlan; 581 } 582 583 /** 584 * batadv_softif_create_vlan - allocate the needed resources for a new vlan 585 * @bat_priv: the bat priv with all the soft interface information 586 * @vid: the VLAN identifier 587 * 588 * Return: 0 on success, a negative error otherwise. 589 */ 590 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 591 { 592 struct batadv_softif_vlan *vlan; 593 int err; 594 595 vlan = batadv_softif_vlan_get(bat_priv, vid); 596 if (vlan) { 597 batadv_softif_vlan_put(vlan); 598 return -EEXIST; 599 } 600 601 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 602 if (!vlan) 603 return -ENOMEM; 604 605 vlan->bat_priv = bat_priv; 606 vlan->vid = vid; 607 kref_init(&vlan->refcount); 608 609 atomic_set(&vlan->ap_isolation, 0); 610 611 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 612 if (err) { 613 kfree(vlan); 614 return err; 615 } 616 617 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 618 kref_get(&vlan->refcount); 619 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 620 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 621 622 /* add a new TT local entry. This one will be marked with the NOPURGE 623 * flag 624 */ 625 batadv_tt_local_add(bat_priv->soft_iface, 626 bat_priv->soft_iface->dev_addr, vid, 627 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 628 629 /* don't return reference to new softif_vlan */ 630 batadv_softif_vlan_put(vlan); 631 632 return 0; 633 } 634 635 /** 636 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object 637 * @bat_priv: the bat priv with all the soft interface information 638 * @vlan: the object to remove 639 */ 640 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 641 struct batadv_softif_vlan *vlan) 642 { 643 /* explicitly remove the associated TT local entry because it is marked 644 * with the NOPURGE flag 645 */ 646 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 647 vlan->vid, "vlan interface destroyed", false); 648 649 batadv_sysfs_del_vlan(bat_priv, vlan); 650 batadv_softif_vlan_put(vlan); 651 } 652 653 /** 654 * batadv_interface_add_vid - ndo_add_vid API implementation 655 * @dev: the netdev of the mesh interface 656 * @proto: protocol of the the vlan id 657 * @vid: identifier of the new vlan 658 * 659 * Set up all the internal structures for handling the new vlan on top of the 660 * mesh interface 661 * 662 * Return: 0 on success or a negative error code in case of failure. 663 */ 664 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 665 unsigned short vid) 666 { 667 struct batadv_priv *bat_priv = netdev_priv(dev); 668 struct batadv_softif_vlan *vlan; 669 int ret; 670 671 /* only 802.1Q vlans are supported. 672 * batman-adv does not know how to handle other types 673 */ 674 if (proto != htons(ETH_P_8021Q)) 675 return -EINVAL; 676 677 vid |= BATADV_VLAN_HAS_TAG; 678 679 /* if a new vlan is getting created and it already exists, it means that 680 * it was not deleted yet. batadv_softif_vlan_get() increases the 681 * refcount in order to revive the object. 682 * 683 * if it does not exist then create it. 684 */ 685 vlan = batadv_softif_vlan_get(bat_priv, vid); 686 if (!vlan) 687 return batadv_softif_create_vlan(bat_priv, vid); 688 689 /* recreate the sysfs object if it was already destroyed (and it should 690 * be since we received a kill_vid() for this vlan 691 */ 692 if (!vlan->kobj) { 693 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 694 if (ret) { 695 batadv_softif_vlan_put(vlan); 696 return ret; 697 } 698 } 699 700 /* add a new TT local entry. This one will be marked with the NOPURGE 701 * flag. This must be added again, even if the vlan object already 702 * exists, because the entry was deleted by kill_vid() 703 */ 704 batadv_tt_local_add(bat_priv->soft_iface, 705 bat_priv->soft_iface->dev_addr, vid, 706 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 707 708 return 0; 709 } 710 711 /** 712 * batadv_interface_kill_vid - ndo_kill_vid API implementation 713 * @dev: the netdev of the mesh interface 714 * @proto: protocol of the the vlan id 715 * @vid: identifier of the deleted vlan 716 * 717 * Destroy all the internal structures used to handle the vlan identified by vid 718 * on top of the mesh interface 719 * 720 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 721 * or -ENOENT if the specified vlan id wasn't registered. 722 */ 723 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 724 unsigned short vid) 725 { 726 struct batadv_priv *bat_priv = netdev_priv(dev); 727 struct batadv_softif_vlan *vlan; 728 729 /* only 802.1Q vlans are supported. batman-adv does not know how to 730 * handle other types 731 */ 732 if (proto != htons(ETH_P_8021Q)) 733 return -EINVAL; 734 735 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 736 if (!vlan) 737 return -ENOENT; 738 739 batadv_softif_destroy_vlan(bat_priv, vlan); 740 741 /* finally free the vlan object */ 742 batadv_softif_vlan_put(vlan); 743 744 return 0; 745 } 746 747 /* batman-adv network devices have devices nesting below it and are a special 748 * "super class" of normal network devices; split their locks off into a 749 * separate class since they always nest. 750 */ 751 static struct lock_class_key batadv_netdev_xmit_lock_key; 752 static struct lock_class_key batadv_netdev_addr_lock_key; 753 754 /** 755 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue 756 * @dev: device which owns the tx queue 757 * @txq: tx queue to modify 758 * @_unused: always NULL 759 */ 760 static void batadv_set_lockdep_class_one(struct net_device *dev, 761 struct netdev_queue *txq, 762 void *_unused) 763 { 764 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 765 } 766 767 /** 768 * batadv_set_lockdep_class - Set txq and addr_list lockdep class 769 * @dev: network device to modify 770 */ 771 static void batadv_set_lockdep_class(struct net_device *dev) 772 { 773 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 774 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 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; 794 795 /* batadv_interface_stats() needs to be available as soon as 796 * register_netdevice() has been called 797 */ 798 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 799 if (!bat_priv->bat_counters) 800 return -ENOMEM; 801 802 atomic_set(&bat_priv->aggregated_ogms, 1); 803 atomic_set(&bat_priv->bonding, 0); 804 #ifdef CONFIG_BATMAN_ADV_BLA 805 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 806 #endif 807 #ifdef CONFIG_BATMAN_ADV_DAT 808 atomic_set(&bat_priv->distributed_arp_table, 1); 809 #endif 810 #ifdef CONFIG_BATMAN_ADV_MCAST 811 bat_priv->mcast.querier_ipv4.exists = false; 812 bat_priv->mcast.querier_ipv4.shadowing = false; 813 bat_priv->mcast.querier_ipv6.exists = false; 814 bat_priv->mcast.querier_ipv6.shadowing = false; 815 bat_priv->mcast.flags = BATADV_NO_FLAGS; 816 atomic_set(&bat_priv->multicast_mode, 1); 817 atomic_set(&bat_priv->mcast.num_disabled, 0); 818 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 819 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 820 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 821 #endif 822 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); 823 atomic_set(&bat_priv->gw.sel_class, 20); 824 atomic_set(&bat_priv->gw.bandwidth_down, 100); 825 atomic_set(&bat_priv->gw.bandwidth_up, 20); 826 atomic_set(&bat_priv->orig_interval, 1000); 827 atomic_set(&bat_priv->hop_penalty, 30); 828 #ifdef CONFIG_BATMAN_ADV_DEBUG 829 atomic_set(&bat_priv->log_level, 0); 830 #endif 831 atomic_set(&bat_priv->fragmentation, 1); 832 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 833 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 834 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 835 836 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 837 atomic_set(&bat_priv->bcast_seqno, 1); 838 atomic_set(&bat_priv->tt.vn, 0); 839 atomic_set(&bat_priv->tt.local_changes, 0); 840 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 841 #ifdef CONFIG_BATMAN_ADV_BLA 842 atomic_set(&bat_priv->bla.num_requests, 0); 843 #endif 844 atomic_set(&bat_priv->tp_num, 0); 845 846 bat_priv->tt.last_changeset = NULL; 847 bat_priv->tt.last_changeset_len = 0; 848 bat_priv->isolation_mark = 0; 849 bat_priv->isolation_mark_mask = 0; 850 851 /* randomize initial seqno to avoid collision */ 852 get_random_bytes(&random_seqno, sizeof(random_seqno)); 853 atomic_set(&bat_priv->frag_seqno, random_seqno); 854 855 bat_priv->primary_if = NULL; 856 bat_priv->num_ifaces = 0; 857 858 batadv_nc_init_bat_priv(bat_priv); 859 860 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 861 if (ret < 0) 862 goto free_bat_counters; 863 864 ret = batadv_debugfs_add_meshif(dev); 865 if (ret < 0) 866 goto free_bat_counters; 867 868 ret = batadv_mesh_init(dev); 869 if (ret < 0) 870 goto unreg_debugfs; 871 872 return 0; 873 874 unreg_debugfs: 875 batadv_debugfs_del_meshif(dev); 876 free_bat_counters: 877 free_percpu(bat_priv->bat_counters); 878 bat_priv->bat_counters = NULL; 879 880 return ret; 881 } 882 883 /** 884 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface 885 * @dev: batadv_soft_interface used as master interface 886 * @slave_dev: net_device which should become the slave interface 887 * 888 * Return: 0 if successful or error otherwise. 889 */ 890 static int batadv_softif_slave_add(struct net_device *dev, 891 struct net_device *slave_dev) 892 { 893 struct batadv_hard_iface *hard_iface; 894 struct net *net = dev_net(dev); 895 int ret = -EINVAL; 896 897 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 898 if (!hard_iface || hard_iface->soft_iface) 899 goto out; 900 901 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name); 902 903 out: 904 if (hard_iface) 905 batadv_hardif_put(hard_iface); 906 return ret; 907 } 908 909 /** 910 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface 911 * @dev: batadv_soft_interface used as master interface 912 * @slave_dev: net_device which should be removed from the master interface 913 * 914 * Return: 0 if successful or error otherwise. 915 */ 916 static int batadv_softif_slave_del(struct net_device *dev, 917 struct net_device *slave_dev) 918 { 919 struct batadv_hard_iface *hard_iface; 920 int ret = -EINVAL; 921 922 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 923 924 if (!hard_iface || hard_iface->soft_iface != dev) 925 goto out; 926 927 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 928 ret = 0; 929 930 out: 931 if (hard_iface) 932 batadv_hardif_put(hard_iface); 933 return ret; 934 } 935 936 static const struct net_device_ops batadv_netdev_ops = { 937 .ndo_init = batadv_softif_init_late, 938 .ndo_open = batadv_interface_open, 939 .ndo_stop = batadv_interface_release, 940 .ndo_get_stats = batadv_interface_stats, 941 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 942 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 943 .ndo_set_mac_address = batadv_interface_set_mac_addr, 944 .ndo_change_mtu = batadv_interface_change_mtu, 945 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 946 .ndo_start_xmit = batadv_interface_tx, 947 .ndo_validate_addr = eth_validate_addr, 948 .ndo_add_slave = batadv_softif_slave_add, 949 .ndo_del_slave = batadv_softif_slave_del, 950 }; 951 952 /** 953 * batadv_softif_free - Deconstructor of batadv_soft_interface 954 * @dev: Device to cleanup and remove 955 */ 956 static void batadv_softif_free(struct net_device *dev) 957 { 958 batadv_debugfs_del_meshif(dev); 959 batadv_mesh_free(dev); 960 961 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 962 * their tasks. Wait for them all to be finished before freeing the 963 * netdev and its private data (bat_priv) 964 */ 965 rcu_barrier(); 966 967 free_netdev(dev); 968 } 969 970 /** 971 * batadv_softif_init_early - early stage initialization of soft interface 972 * @dev: registered network device to modify 973 */ 974 static void batadv_softif_init_early(struct net_device *dev) 975 { 976 struct batadv_priv *priv = netdev_priv(dev); 977 978 ether_setup(dev); 979 980 dev->netdev_ops = &batadv_netdev_ops; 981 dev->destructor = batadv_softif_free; 982 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; 983 dev->priv_flags |= IFF_NO_QUEUE; 984 985 /* can't call min_mtu, because the needed variables 986 * have not been initialized yet 987 */ 988 dev->mtu = ETH_DATA_LEN; 989 990 /* generate random address */ 991 eth_hw_addr_random(dev); 992 993 dev->ethtool_ops = &batadv_ethtool_ops; 994 995 memset(priv, 0, sizeof(*priv)); 996 } 997 998 struct net_device *batadv_softif_create(struct net *net, const char *name) 999 { 1000 struct net_device *soft_iface; 1001 int ret; 1002 1003 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 1004 NET_NAME_UNKNOWN, batadv_softif_init_early); 1005 if (!soft_iface) 1006 return NULL; 1007 1008 dev_net_set(soft_iface, net); 1009 1010 soft_iface->rtnl_link_ops = &batadv_link_ops; 1011 1012 ret = register_netdevice(soft_iface); 1013 if (ret < 0) { 1014 pr_err("Unable to register the batman interface '%s': %i\n", 1015 name, ret); 1016 free_netdev(soft_iface); 1017 return NULL; 1018 } 1019 1020 return soft_iface; 1021 } 1022 1023 /** 1024 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs 1025 * @soft_iface: the to-be-removed batman-adv interface 1026 */ 1027 void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 1028 { 1029 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1030 struct batadv_softif_vlan *vlan; 1031 1032 ASSERT_RTNL(); 1033 1034 /* destroy the "untagged" VLAN */ 1035 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1036 if (vlan) { 1037 batadv_softif_destroy_vlan(bat_priv, vlan); 1038 batadv_softif_vlan_put(vlan); 1039 } 1040 1041 batadv_sysfs_del_meshif(soft_iface); 1042 unregister_netdevice(soft_iface); 1043 } 1044 1045 /** 1046 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink 1047 * @soft_iface: the to-be-removed batman-adv interface 1048 * @head: list pointer 1049 */ 1050 static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1051 struct list_head *head) 1052 { 1053 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1054 struct batadv_hard_iface *hard_iface; 1055 struct batadv_softif_vlan *vlan; 1056 1057 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1058 if (hard_iface->soft_iface == soft_iface) 1059 batadv_hardif_disable_interface(hard_iface, 1060 BATADV_IF_CLEANUP_KEEP); 1061 } 1062 1063 /* destroy the "untagged" VLAN */ 1064 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1065 if (vlan) { 1066 batadv_softif_destroy_vlan(bat_priv, vlan); 1067 batadv_softif_vlan_put(vlan); 1068 } 1069 1070 batadv_sysfs_del_meshif(soft_iface); 1071 unregister_netdevice_queue(soft_iface, head); 1072 } 1073 1074 bool batadv_softif_is_valid(const struct net_device *net_dev) 1075 { 1076 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1077 return true; 1078 1079 return false; 1080 } 1081 1082 struct rtnl_link_ops batadv_link_ops __read_mostly = { 1083 .kind = "batadv", 1084 .priv_size = sizeof(struct batadv_priv), 1085 .setup = batadv_softif_init_early, 1086 .dellink = batadv_softif_destroy_netlink, 1087 }; 1088 1089 /* ethtool */ 1090 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1091 { 1092 cmd->supported = 0; 1093 cmd->advertising = 0; 1094 ethtool_cmd_speed_set(cmd, SPEED_10); 1095 cmd->duplex = DUPLEX_FULL; 1096 cmd->port = PORT_TP; 1097 cmd->phy_address = 0; 1098 cmd->transceiver = XCVR_INTERNAL; 1099 cmd->autoneg = AUTONEG_DISABLE; 1100 cmd->maxtxpkt = 0; 1101 cmd->maxrxpkt = 0; 1102 1103 return 0; 1104 } 1105 1106 static void batadv_get_drvinfo(struct net_device *dev, 1107 struct ethtool_drvinfo *info) 1108 { 1109 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 1110 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 1111 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 1112 strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); 1113 } 1114 1115 static u32 batadv_get_msglevel(struct net_device *dev) 1116 { 1117 return -EOPNOTSUPP; 1118 } 1119 1120 static void batadv_set_msglevel(struct net_device *dev, u32 value) 1121 { 1122 } 1123 1124 static u32 batadv_get_link(struct net_device *dev) 1125 { 1126 return 1; 1127 } 1128 1129 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 1130 * Declare each description string in struct.name[] to get fixed sized buffer 1131 * and compile time checking for strings longer than ETH_GSTRING_LEN. 1132 */ 1133 static const struct { 1134 const char name[ETH_GSTRING_LEN]; 1135 } batadv_counters_strings[] = { 1136 { "tx" }, 1137 { "tx_bytes" }, 1138 { "tx_dropped" }, 1139 { "rx" }, 1140 { "rx_bytes" }, 1141 { "forward" }, 1142 { "forward_bytes" }, 1143 { "mgmt_tx" }, 1144 { "mgmt_tx_bytes" }, 1145 { "mgmt_rx" }, 1146 { "mgmt_rx_bytes" }, 1147 { "frag_tx" }, 1148 { "frag_tx_bytes" }, 1149 { "frag_rx" }, 1150 { "frag_rx_bytes" }, 1151 { "frag_fwd" }, 1152 { "frag_fwd_bytes" }, 1153 { "tt_request_tx" }, 1154 { "tt_request_rx" }, 1155 { "tt_response_tx" }, 1156 { "tt_response_rx" }, 1157 { "tt_roam_adv_tx" }, 1158 { "tt_roam_adv_rx" }, 1159 #ifdef CONFIG_BATMAN_ADV_DAT 1160 { "dat_get_tx" }, 1161 { "dat_get_rx" }, 1162 { "dat_put_tx" }, 1163 { "dat_put_rx" }, 1164 { "dat_cached_reply_tx" }, 1165 #endif 1166 #ifdef CONFIG_BATMAN_ADV_NC 1167 { "nc_code" }, 1168 { "nc_code_bytes" }, 1169 { "nc_recode" }, 1170 { "nc_recode_bytes" }, 1171 { "nc_buffer" }, 1172 { "nc_decode" }, 1173 { "nc_decode_bytes" }, 1174 { "nc_decode_failed" }, 1175 { "nc_sniffed" }, 1176 #endif 1177 }; 1178 1179 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 1180 { 1181 if (stringset == ETH_SS_STATS) 1182 memcpy(data, batadv_counters_strings, 1183 sizeof(batadv_counters_strings)); 1184 } 1185 1186 static void batadv_get_ethtool_stats(struct net_device *dev, 1187 struct ethtool_stats *stats, u64 *data) 1188 { 1189 struct batadv_priv *bat_priv = netdev_priv(dev); 1190 int i; 1191 1192 for (i = 0; i < BATADV_CNT_NUM; i++) 1193 data[i] = batadv_sum_counter(bat_priv, i); 1194 } 1195 1196 static int batadv_get_sset_count(struct net_device *dev, int stringset) 1197 { 1198 if (stringset == ETH_SS_STATS) 1199 return BATADV_CNT_NUM; 1200 1201 return -EOPNOTSUPP; 1202 } 1203