1 /* Copyright (C) 2007-2017 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 !batadv_bla_is_loopdetect_mac(ethhdr->h_source)) { 263 client_added = batadv_tt_local_add(soft_iface, ethhdr->h_source, 264 vid, skb->skb_iif, 265 skb->mark); 266 if (!client_added) 267 goto dropped; 268 } 269 270 /* don't accept stp packets. STP does not help in meshes. 271 * better use the bridge loop avoidance ... 272 * 273 * The same goes for ECTP sent at least by some Cisco Switches, 274 * it might confuse the mesh when used with bridge loop avoidance. 275 */ 276 if (batadv_compare_eth(ethhdr->h_dest, stp_addr)) 277 goto dropped; 278 279 if (batadv_compare_eth(ethhdr->h_dest, ectp_addr)) 280 goto dropped; 281 282 gw_mode = atomic_read(&bat_priv->gw.mode); 283 if (is_multicast_ether_addr(ethhdr->h_dest)) { 284 /* if gw mode is off, broadcast every packet */ 285 if (gw_mode == BATADV_GW_MODE_OFF) { 286 do_bcast = true; 287 goto send; 288 } 289 290 dhcp_rcp = batadv_gw_dhcp_recipient_get(skb, &header_len, 291 chaddr); 292 /* skb->data may have been modified by 293 * batadv_gw_dhcp_recipient_get() 294 */ 295 ethhdr = eth_hdr(skb); 296 /* if gw_mode is on, broadcast any non-DHCP message. 297 * All the DHCP packets are going to be sent as unicast 298 */ 299 if (dhcp_rcp == BATADV_DHCP_NO) { 300 do_bcast = true; 301 goto send; 302 } 303 304 if (dhcp_rcp == BATADV_DHCP_TO_CLIENT) 305 dst_hint = chaddr; 306 else if ((gw_mode == BATADV_GW_MODE_SERVER) && 307 (dhcp_rcp == BATADV_DHCP_TO_SERVER)) 308 /* gateways should not forward any DHCP message if 309 * directed to a DHCP server 310 */ 311 goto dropped; 312 313 send: 314 if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) { 315 forw_mode = batadv_mcast_forw_mode(bat_priv, skb, 316 &mcast_single_orig); 317 if (forw_mode == BATADV_FORW_NONE) 318 goto dropped; 319 320 if (forw_mode == BATADV_FORW_SINGLE) 321 do_bcast = false; 322 } 323 } 324 325 batadv_skb_set_priority(skb, 0); 326 327 /* ethernet packet should be broadcasted */ 328 if (do_bcast) { 329 primary_if = batadv_primary_if_get_selected(bat_priv); 330 if (!primary_if) 331 goto dropped; 332 333 /* in case of ARP request, we do not immediately broadcasti the 334 * packet, instead we first wait for DAT to try to retrieve the 335 * correct ARP entry 336 */ 337 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, skb)) 338 brd_delay = msecs_to_jiffies(ARP_REQ_DELAY); 339 340 if (batadv_skb_head_push(skb, sizeof(*bcast_packet)) < 0) 341 goto dropped; 342 343 bcast_packet = (struct batadv_bcast_packet *)skb->data; 344 bcast_packet->version = BATADV_COMPAT_VERSION; 345 bcast_packet->ttl = BATADV_TTL; 346 347 /* batman packet type: broadcast */ 348 bcast_packet->packet_type = BATADV_BCAST; 349 bcast_packet->reserved = 0; 350 351 /* hw address of first interface is the orig mac because only 352 * this mac is known throughout the mesh 353 */ 354 ether_addr_copy(bcast_packet->orig, 355 primary_if->net_dev->dev_addr); 356 357 /* set broadcast sequence number */ 358 seqno = atomic_inc_return(&bat_priv->bcast_seqno); 359 bcast_packet->seqno = htonl(seqno); 360 361 batadv_add_bcast_packet_to_list(bat_priv, skb, brd_delay, true); 362 363 /* a copy is stored in the bcast list, therefore removing 364 * the original skb. 365 */ 366 consume_skb(skb); 367 368 /* unicast packet */ 369 } else { 370 /* DHCP packets going to a server will use the GW feature */ 371 if (dhcp_rcp == BATADV_DHCP_TO_SERVER) { 372 ret = batadv_gw_out_of_range(bat_priv, skb); 373 if (ret) 374 goto dropped; 375 ret = batadv_send_skb_via_gw(bat_priv, skb, vid); 376 } else if (mcast_single_orig) { 377 ret = batadv_send_skb_unicast(bat_priv, skb, 378 BATADV_UNICAST, 0, 379 mcast_single_orig, vid); 380 } else { 381 if (batadv_dat_snoop_outgoing_arp_request(bat_priv, 382 skb)) 383 goto dropped; 384 385 batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb); 386 387 ret = batadv_send_skb_via_tt(bat_priv, skb, dst_hint, 388 vid); 389 } 390 if (ret != NET_XMIT_SUCCESS) 391 goto dropped_freed; 392 } 393 394 batadv_inc_counter(bat_priv, BATADV_CNT_TX); 395 batadv_add_counter(bat_priv, BATADV_CNT_TX_BYTES, data_len); 396 goto end; 397 398 dropped: 399 kfree_skb(skb); 400 dropped_freed: 401 batadv_inc_counter(bat_priv, BATADV_CNT_TX_DROPPED); 402 end: 403 if (mcast_single_orig) 404 batadv_orig_node_put(mcast_single_orig); 405 if (primary_if) 406 batadv_hardif_put(primary_if); 407 return NETDEV_TX_OK; 408 } 409 410 /** 411 * batadv_interface_rx - receive ethernet frame on local batman-adv interface 412 * @soft_iface: local interface which will receive the ethernet frame 413 * @skb: ethernet frame for @soft_iface 414 * @hdr_size: size of already parsed batman-adv header 415 * @orig_node: originator from which the batman-adv packet was sent 416 * 417 * Sends a ethernet frame to the receive path of the local @soft_iface. 418 * skb->data has still point to the batman-adv header with the size @hdr_size. 419 * The caller has to have parsed this header already and made sure that at least 420 * @hdr_size bytes are still available for pull in @skb. 421 * 422 * The packet may still get dropped. This can happen when the encapsulated 423 * ethernet frame is invalid or contains again an batman-adv packet. Also 424 * unicast packets will be dropped directly when it was sent between two 425 * isolated clients. 426 */ 427 void batadv_interface_rx(struct net_device *soft_iface, 428 struct sk_buff *skb, int hdr_size, 429 struct batadv_orig_node *orig_node) 430 { 431 struct batadv_bcast_packet *batadv_bcast_packet; 432 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 433 struct vlan_ethhdr *vhdr; 434 struct ethhdr *ethhdr; 435 unsigned short vid; 436 bool is_bcast; 437 438 batadv_bcast_packet = (struct batadv_bcast_packet *)skb->data; 439 is_bcast = (batadv_bcast_packet->packet_type == BATADV_BCAST); 440 441 skb_pull_rcsum(skb, hdr_size); 442 skb_reset_mac_header(skb); 443 444 /* clean the netfilter state now that the batman-adv header has been 445 * removed 446 */ 447 nf_reset(skb); 448 449 if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) 450 goto dropped; 451 452 vid = batadv_get_vid(skb, 0); 453 ethhdr = eth_hdr(skb); 454 455 switch (ntohs(ethhdr->h_proto)) { 456 case ETH_P_8021Q: 457 if (!pskb_may_pull(skb, VLAN_ETH_HLEN)) 458 goto dropped; 459 460 vhdr = (struct vlan_ethhdr *)skb->data; 461 462 /* drop batman-in-batman packets to prevent loops */ 463 if (vhdr->h_vlan_encapsulated_proto != htons(ETH_P_BATMAN)) 464 break; 465 466 /* fall through */ 467 case ETH_P_BATMAN: 468 goto dropped; 469 } 470 471 /* skb->dev & skb->pkt_type are set here */ 472 skb->protocol = eth_type_trans(skb, soft_iface); 473 474 /* should not be necessary anymore as we use skb_pull_rcsum() 475 * TODO: please verify this and remove this TODO 476 * -- Dec 21st 2009, Simon Wunderlich 477 */ 478 479 /* skb->ip_summed = CHECKSUM_UNNECESSARY; */ 480 481 batadv_inc_counter(bat_priv, BATADV_CNT_RX); 482 batadv_add_counter(bat_priv, BATADV_CNT_RX_BYTES, 483 skb->len + ETH_HLEN); 484 485 /* Let the bridge loop avoidance check the packet. If will 486 * not handle it, we can safely push it up. 487 */ 488 if (batadv_bla_rx(bat_priv, skb, vid, is_bcast)) 489 goto out; 490 491 if (orig_node) 492 batadv_tt_add_temporary_global_entry(bat_priv, orig_node, 493 ethhdr->h_source, vid); 494 495 if (is_multicast_ether_addr(ethhdr->h_dest)) { 496 /* set the mark on broadcast packets if AP isolation is ON and 497 * the packet is coming from an "isolated" client 498 */ 499 if (batadv_vlan_ap_isola_get(bat_priv, vid) && 500 batadv_tt_global_is_isolated(bat_priv, ethhdr->h_source, 501 vid)) { 502 /* save bits in skb->mark not covered by the mask and 503 * apply the mark on the rest 504 */ 505 skb->mark &= ~bat_priv->isolation_mark_mask; 506 skb->mark |= bat_priv->isolation_mark; 507 } 508 } else if (batadv_is_ap_isolated(bat_priv, ethhdr->h_source, 509 ethhdr->h_dest, vid)) { 510 goto dropped; 511 } 512 513 netif_rx(skb); 514 goto out; 515 516 dropped: 517 kfree_skb(skb); 518 out: 519 return; 520 } 521 522 /** 523 * batadv_softif_vlan_release - release vlan from lists and queue for free after 524 * rcu grace period 525 * @ref: kref pointer of the vlan object 526 */ 527 static void batadv_softif_vlan_release(struct kref *ref) 528 { 529 struct batadv_softif_vlan *vlan; 530 531 vlan = container_of(ref, struct batadv_softif_vlan, refcount); 532 533 spin_lock_bh(&vlan->bat_priv->softif_vlan_list_lock); 534 hlist_del_rcu(&vlan->list); 535 spin_unlock_bh(&vlan->bat_priv->softif_vlan_list_lock); 536 537 kfree_rcu(vlan, rcu); 538 } 539 540 /** 541 * batadv_softif_vlan_put - decrease the vlan object refcounter and 542 * possibly release it 543 * @vlan: the vlan object to release 544 */ 545 void batadv_softif_vlan_put(struct batadv_softif_vlan *vlan) 546 { 547 if (!vlan) 548 return; 549 550 kref_put(&vlan->refcount, batadv_softif_vlan_release); 551 } 552 553 /** 554 * batadv_softif_vlan_get - get the vlan object for a specific vid 555 * @bat_priv: the bat priv with all the soft interface information 556 * @vid: the identifier of the vlan object to retrieve 557 * 558 * Return: the private data of the vlan matching the vid passed as argument or 559 * NULL otherwise. The refcounter of the returned object is incremented by 1. 560 */ 561 struct batadv_softif_vlan *batadv_softif_vlan_get(struct batadv_priv *bat_priv, 562 unsigned short vid) 563 { 564 struct batadv_softif_vlan *vlan_tmp, *vlan = NULL; 565 566 rcu_read_lock(); 567 hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) { 568 if (vlan_tmp->vid != vid) 569 continue; 570 571 if (!kref_get_unless_zero(&vlan_tmp->refcount)) 572 continue; 573 574 vlan = vlan_tmp; 575 break; 576 } 577 rcu_read_unlock(); 578 579 return vlan; 580 } 581 582 /** 583 * batadv_softif_create_vlan - allocate the needed resources for a new vlan 584 * @bat_priv: the bat priv with all the soft interface information 585 * @vid: the VLAN identifier 586 * 587 * Return: 0 on success, a negative error otherwise. 588 */ 589 int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) 590 { 591 struct batadv_softif_vlan *vlan; 592 int err; 593 594 vlan = batadv_softif_vlan_get(bat_priv, vid); 595 if (vlan) { 596 batadv_softif_vlan_put(vlan); 597 return -EEXIST; 598 } 599 600 vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); 601 if (!vlan) 602 return -ENOMEM; 603 604 vlan->bat_priv = bat_priv; 605 vlan->vid = vid; 606 kref_init(&vlan->refcount); 607 608 atomic_set(&vlan->ap_isolation, 0); 609 610 err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 611 if (err) { 612 kfree(vlan); 613 return err; 614 } 615 616 spin_lock_bh(&bat_priv->softif_vlan_list_lock); 617 kref_get(&vlan->refcount); 618 hlist_add_head_rcu(&vlan->list, &bat_priv->softif_vlan_list); 619 spin_unlock_bh(&bat_priv->softif_vlan_list_lock); 620 621 /* add a new TT local entry. This one will be marked with the NOPURGE 622 * flag 623 */ 624 batadv_tt_local_add(bat_priv->soft_iface, 625 bat_priv->soft_iface->dev_addr, vid, 626 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 627 628 /* don't return reference to new softif_vlan */ 629 batadv_softif_vlan_put(vlan); 630 631 return 0; 632 } 633 634 /** 635 * batadv_softif_destroy_vlan - remove and destroy a softif_vlan object 636 * @bat_priv: the bat priv with all the soft interface information 637 * @vlan: the object to remove 638 */ 639 static void batadv_softif_destroy_vlan(struct batadv_priv *bat_priv, 640 struct batadv_softif_vlan *vlan) 641 { 642 /* explicitly remove the associated TT local entry because it is marked 643 * with the NOPURGE flag 644 */ 645 batadv_tt_local_remove(bat_priv, bat_priv->soft_iface->dev_addr, 646 vlan->vid, "vlan interface destroyed", false); 647 648 batadv_sysfs_del_vlan(bat_priv, vlan); 649 batadv_softif_vlan_put(vlan); 650 } 651 652 /** 653 * batadv_interface_add_vid - ndo_add_vid API implementation 654 * @dev: the netdev of the mesh interface 655 * @proto: protocol of the the vlan id 656 * @vid: identifier of the new vlan 657 * 658 * Set up all the internal structures for handling the new vlan on top of the 659 * mesh interface 660 * 661 * Return: 0 on success or a negative error code in case of failure. 662 */ 663 static int batadv_interface_add_vid(struct net_device *dev, __be16 proto, 664 unsigned short vid) 665 { 666 struct batadv_priv *bat_priv = netdev_priv(dev); 667 struct batadv_softif_vlan *vlan; 668 int ret; 669 670 /* only 802.1Q vlans are supported. 671 * batman-adv does not know how to handle other types 672 */ 673 if (proto != htons(ETH_P_8021Q)) 674 return -EINVAL; 675 676 vid |= BATADV_VLAN_HAS_TAG; 677 678 /* if a new vlan is getting created and it already exists, it means that 679 * it was not deleted yet. batadv_softif_vlan_get() increases the 680 * refcount in order to revive the object. 681 * 682 * if it does not exist then create it. 683 */ 684 vlan = batadv_softif_vlan_get(bat_priv, vid); 685 if (!vlan) 686 return batadv_softif_create_vlan(bat_priv, vid); 687 688 /* recreate the sysfs object if it was already destroyed (and it should 689 * be since we received a kill_vid() for this vlan 690 */ 691 if (!vlan->kobj) { 692 ret = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); 693 if (ret) { 694 batadv_softif_vlan_put(vlan); 695 return ret; 696 } 697 } 698 699 /* add a new TT local entry. This one will be marked with the NOPURGE 700 * flag. This must be added again, even if the vlan object already 701 * exists, because the entry was deleted by kill_vid() 702 */ 703 batadv_tt_local_add(bat_priv->soft_iface, 704 bat_priv->soft_iface->dev_addr, vid, 705 BATADV_NULL_IFINDEX, BATADV_NO_MARK); 706 707 return 0; 708 } 709 710 /** 711 * batadv_interface_kill_vid - ndo_kill_vid API implementation 712 * @dev: the netdev of the mesh interface 713 * @proto: protocol of the the vlan id 714 * @vid: identifier of the deleted vlan 715 * 716 * Destroy all the internal structures used to handle the vlan identified by vid 717 * on top of the mesh interface 718 * 719 * Return: 0 on success, -EINVAL if the specified prototype is not ETH_P_8021Q 720 * or -ENOENT if the specified vlan id wasn't registered. 721 */ 722 static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, 723 unsigned short vid) 724 { 725 struct batadv_priv *bat_priv = netdev_priv(dev); 726 struct batadv_softif_vlan *vlan; 727 728 /* only 802.1Q vlans are supported. batman-adv does not know how to 729 * handle other types 730 */ 731 if (proto != htons(ETH_P_8021Q)) 732 return -EINVAL; 733 734 vlan = batadv_softif_vlan_get(bat_priv, vid | BATADV_VLAN_HAS_TAG); 735 if (!vlan) 736 return -ENOENT; 737 738 batadv_softif_destroy_vlan(bat_priv, vlan); 739 740 /* finally free the vlan object */ 741 batadv_softif_vlan_put(vlan); 742 743 return 0; 744 } 745 746 /* batman-adv network devices have devices nesting below it and are a special 747 * "super class" of normal network devices; split their locks off into a 748 * separate class since they always nest. 749 */ 750 static struct lock_class_key batadv_netdev_xmit_lock_key; 751 static struct lock_class_key batadv_netdev_addr_lock_key; 752 753 /** 754 * batadv_set_lockdep_class_one - Set lockdep class for a single tx queue 755 * @dev: device which owns the tx queue 756 * @txq: tx queue to modify 757 * @_unused: always NULL 758 */ 759 static void batadv_set_lockdep_class_one(struct net_device *dev, 760 struct netdev_queue *txq, 761 void *_unused) 762 { 763 lockdep_set_class(&txq->_xmit_lock, &batadv_netdev_xmit_lock_key); 764 } 765 766 /** 767 * batadv_set_lockdep_class - Set txq and addr_list lockdep class 768 * @dev: network device to modify 769 */ 770 static void batadv_set_lockdep_class(struct net_device *dev) 771 { 772 lockdep_set_class(&dev->addr_list_lock, &batadv_netdev_addr_lock_key); 773 netdev_for_each_tx_queue(dev, batadv_set_lockdep_class_one, NULL); 774 } 775 776 /** 777 * batadv_softif_init_late - late stage initialization of soft interface 778 * @dev: registered network device to modify 779 * 780 * Return: error code on failures 781 */ 782 static int batadv_softif_init_late(struct net_device *dev) 783 { 784 struct batadv_priv *bat_priv; 785 u32 random_seqno; 786 int ret; 787 size_t cnt_len = sizeof(u64) * BATADV_CNT_NUM; 788 789 batadv_set_lockdep_class(dev); 790 791 bat_priv = netdev_priv(dev); 792 bat_priv->soft_iface = dev; 793 794 /* batadv_interface_stats() needs to be available as soon as 795 * register_netdevice() has been called 796 */ 797 bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(u64)); 798 if (!bat_priv->bat_counters) 799 return -ENOMEM; 800 801 atomic_set(&bat_priv->aggregated_ogms, 1); 802 atomic_set(&bat_priv->bonding, 0); 803 #ifdef CONFIG_BATMAN_ADV_BLA 804 atomic_set(&bat_priv->bridge_loop_avoidance, 1); 805 #endif 806 #ifdef CONFIG_BATMAN_ADV_DAT 807 atomic_set(&bat_priv->distributed_arp_table, 1); 808 #endif 809 #ifdef CONFIG_BATMAN_ADV_MCAST 810 bat_priv->mcast.querier_ipv4.exists = false; 811 bat_priv->mcast.querier_ipv4.shadowing = false; 812 bat_priv->mcast.querier_ipv6.exists = false; 813 bat_priv->mcast.querier_ipv6.shadowing = false; 814 bat_priv->mcast.flags = BATADV_NO_FLAGS; 815 atomic_set(&bat_priv->multicast_mode, 1); 816 atomic_set(&bat_priv->mcast.num_disabled, 0); 817 atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0); 818 atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0); 819 atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0); 820 #endif 821 atomic_set(&bat_priv->gw.mode, BATADV_GW_MODE_OFF); 822 atomic_set(&bat_priv->gw.sel_class, 20); 823 atomic_set(&bat_priv->gw.bandwidth_down, 100); 824 atomic_set(&bat_priv->gw.bandwidth_up, 20); 825 atomic_set(&bat_priv->orig_interval, 1000); 826 atomic_set(&bat_priv->hop_penalty, 30); 827 #ifdef CONFIG_BATMAN_ADV_DEBUG 828 atomic_set(&bat_priv->log_level, 0); 829 #endif 830 atomic_set(&bat_priv->fragmentation, 1); 831 atomic_set(&bat_priv->packet_size_max, ETH_DATA_LEN); 832 atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN); 833 atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN); 834 835 atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE); 836 atomic_set(&bat_priv->bcast_seqno, 1); 837 atomic_set(&bat_priv->tt.vn, 0); 838 atomic_set(&bat_priv->tt.local_changes, 0); 839 atomic_set(&bat_priv->tt.ogm_append_cnt, 0); 840 #ifdef CONFIG_BATMAN_ADV_BLA 841 atomic_set(&bat_priv->bla.num_requests, 0); 842 #endif 843 atomic_set(&bat_priv->tp_num, 0); 844 845 bat_priv->tt.last_changeset = NULL; 846 bat_priv->tt.last_changeset_len = 0; 847 bat_priv->isolation_mark = 0; 848 bat_priv->isolation_mark_mask = 0; 849 850 /* randomize initial seqno to avoid collision */ 851 get_random_bytes(&random_seqno, sizeof(random_seqno)); 852 atomic_set(&bat_priv->frag_seqno, random_seqno); 853 854 bat_priv->primary_if = NULL; 855 bat_priv->num_ifaces = 0; 856 857 batadv_nc_init_bat_priv(bat_priv); 858 859 ret = batadv_algo_select(bat_priv, batadv_routing_algo); 860 if (ret < 0) 861 goto free_bat_counters; 862 863 ret = batadv_debugfs_add_meshif(dev); 864 if (ret < 0) 865 goto free_bat_counters; 866 867 ret = batadv_mesh_init(dev); 868 if (ret < 0) 869 goto unreg_debugfs; 870 871 return 0; 872 873 unreg_debugfs: 874 batadv_debugfs_del_meshif(dev); 875 free_bat_counters: 876 free_percpu(bat_priv->bat_counters); 877 bat_priv->bat_counters = NULL; 878 879 return ret; 880 } 881 882 /** 883 * batadv_softif_slave_add - Add a slave interface to a batadv_soft_interface 884 * @dev: batadv_soft_interface used as master interface 885 * @slave_dev: net_device which should become the slave interface 886 * 887 * Return: 0 if successful or error otherwise. 888 */ 889 static int batadv_softif_slave_add(struct net_device *dev, 890 struct net_device *slave_dev) 891 { 892 struct batadv_hard_iface *hard_iface; 893 struct net *net = dev_net(dev); 894 int ret = -EINVAL; 895 896 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 897 if (!hard_iface || hard_iface->soft_iface) 898 goto out; 899 900 ret = batadv_hardif_enable_interface(hard_iface, net, dev->name); 901 902 out: 903 if (hard_iface) 904 batadv_hardif_put(hard_iface); 905 return ret; 906 } 907 908 /** 909 * batadv_softif_slave_del - Delete a slave iface from a batadv_soft_interface 910 * @dev: batadv_soft_interface used as master interface 911 * @slave_dev: net_device which should be removed from the master interface 912 * 913 * Return: 0 if successful or error otherwise. 914 */ 915 static int batadv_softif_slave_del(struct net_device *dev, 916 struct net_device *slave_dev) 917 { 918 struct batadv_hard_iface *hard_iface; 919 int ret = -EINVAL; 920 921 hard_iface = batadv_hardif_get_by_netdev(slave_dev); 922 923 if (!hard_iface || hard_iface->soft_iface != dev) 924 goto out; 925 926 batadv_hardif_disable_interface(hard_iface, BATADV_IF_CLEANUP_KEEP); 927 ret = 0; 928 929 out: 930 if (hard_iface) 931 batadv_hardif_put(hard_iface); 932 return ret; 933 } 934 935 static const struct net_device_ops batadv_netdev_ops = { 936 .ndo_init = batadv_softif_init_late, 937 .ndo_open = batadv_interface_open, 938 .ndo_stop = batadv_interface_release, 939 .ndo_get_stats = batadv_interface_stats, 940 .ndo_vlan_rx_add_vid = batadv_interface_add_vid, 941 .ndo_vlan_rx_kill_vid = batadv_interface_kill_vid, 942 .ndo_set_mac_address = batadv_interface_set_mac_addr, 943 .ndo_change_mtu = batadv_interface_change_mtu, 944 .ndo_set_rx_mode = batadv_interface_set_rx_mode, 945 .ndo_start_xmit = batadv_interface_tx, 946 .ndo_validate_addr = eth_validate_addr, 947 .ndo_add_slave = batadv_softif_slave_add, 948 .ndo_del_slave = batadv_softif_slave_del, 949 }; 950 951 /** 952 * batadv_softif_free - Deconstructor of batadv_soft_interface 953 * @dev: Device to cleanup and remove 954 */ 955 static void batadv_softif_free(struct net_device *dev) 956 { 957 batadv_debugfs_del_meshif(dev); 958 batadv_mesh_free(dev); 959 960 /* some scheduled RCU callbacks need the bat_priv struct to accomplish 961 * their tasks. Wait for them all to be finished before freeing the 962 * netdev and its private data (bat_priv) 963 */ 964 rcu_barrier(); 965 966 free_netdev(dev); 967 } 968 969 /** 970 * batadv_softif_init_early - early stage initialization of soft interface 971 * @dev: registered network device to modify 972 */ 973 static void batadv_softif_init_early(struct net_device *dev) 974 { 975 struct batadv_priv *priv = netdev_priv(dev); 976 977 ether_setup(dev); 978 979 dev->netdev_ops = &batadv_netdev_ops; 980 dev->destructor = batadv_softif_free; 981 dev->features |= NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_NETNS_LOCAL; 982 dev->priv_flags |= IFF_NO_QUEUE; 983 984 /* can't call min_mtu, because the needed variables 985 * have not been initialized yet 986 */ 987 dev->mtu = ETH_DATA_LEN; 988 989 /* generate random address */ 990 eth_hw_addr_random(dev); 991 992 dev->ethtool_ops = &batadv_ethtool_ops; 993 994 memset(priv, 0, sizeof(*priv)); 995 } 996 997 struct net_device *batadv_softif_create(struct net *net, const char *name) 998 { 999 struct net_device *soft_iface; 1000 int ret; 1001 1002 soft_iface = alloc_netdev(sizeof(struct batadv_priv), name, 1003 NET_NAME_UNKNOWN, batadv_softif_init_early); 1004 if (!soft_iface) 1005 return NULL; 1006 1007 dev_net_set(soft_iface, net); 1008 1009 soft_iface->rtnl_link_ops = &batadv_link_ops; 1010 1011 ret = register_netdevice(soft_iface); 1012 if (ret < 0) { 1013 pr_err("Unable to register the batman interface '%s': %i\n", 1014 name, ret); 1015 free_netdev(soft_iface); 1016 return NULL; 1017 } 1018 1019 return soft_iface; 1020 } 1021 1022 /** 1023 * batadv_softif_destroy_sysfs - deletion of batadv_soft_interface via sysfs 1024 * @soft_iface: the to-be-removed batman-adv interface 1025 */ 1026 void batadv_softif_destroy_sysfs(struct net_device *soft_iface) 1027 { 1028 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1029 struct batadv_softif_vlan *vlan; 1030 1031 ASSERT_RTNL(); 1032 1033 /* destroy the "untagged" VLAN */ 1034 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1035 if (vlan) { 1036 batadv_softif_destroy_vlan(bat_priv, vlan); 1037 batadv_softif_vlan_put(vlan); 1038 } 1039 1040 batadv_sysfs_del_meshif(soft_iface); 1041 unregister_netdevice(soft_iface); 1042 } 1043 1044 /** 1045 * batadv_softif_destroy_netlink - deletion of batadv_soft_interface via netlink 1046 * @soft_iface: the to-be-removed batman-adv interface 1047 * @head: list pointer 1048 */ 1049 static void batadv_softif_destroy_netlink(struct net_device *soft_iface, 1050 struct list_head *head) 1051 { 1052 struct batadv_priv *bat_priv = netdev_priv(soft_iface); 1053 struct batadv_hard_iface *hard_iface; 1054 struct batadv_softif_vlan *vlan; 1055 1056 list_for_each_entry(hard_iface, &batadv_hardif_list, list) { 1057 if (hard_iface->soft_iface == soft_iface) 1058 batadv_hardif_disable_interface(hard_iface, 1059 BATADV_IF_CLEANUP_KEEP); 1060 } 1061 1062 /* destroy the "untagged" VLAN */ 1063 vlan = batadv_softif_vlan_get(bat_priv, BATADV_NO_FLAGS); 1064 if (vlan) { 1065 batadv_softif_destroy_vlan(bat_priv, vlan); 1066 batadv_softif_vlan_put(vlan); 1067 } 1068 1069 batadv_sysfs_del_meshif(soft_iface); 1070 unregister_netdevice_queue(soft_iface, head); 1071 } 1072 1073 bool batadv_softif_is_valid(const struct net_device *net_dev) 1074 { 1075 if (net_dev->netdev_ops->ndo_start_xmit == batadv_interface_tx) 1076 return true; 1077 1078 return false; 1079 } 1080 1081 struct rtnl_link_ops batadv_link_ops __read_mostly = { 1082 .kind = "batadv", 1083 .priv_size = sizeof(struct batadv_priv), 1084 .setup = batadv_softif_init_early, 1085 .dellink = batadv_softif_destroy_netlink, 1086 }; 1087 1088 /* ethtool */ 1089 static int batadv_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) 1090 { 1091 cmd->supported = 0; 1092 cmd->advertising = 0; 1093 ethtool_cmd_speed_set(cmd, SPEED_10); 1094 cmd->duplex = DUPLEX_FULL; 1095 cmd->port = PORT_TP; 1096 cmd->phy_address = 0; 1097 cmd->transceiver = XCVR_INTERNAL; 1098 cmd->autoneg = AUTONEG_DISABLE; 1099 cmd->maxtxpkt = 0; 1100 cmd->maxrxpkt = 0; 1101 1102 return 0; 1103 } 1104 1105 static void batadv_get_drvinfo(struct net_device *dev, 1106 struct ethtool_drvinfo *info) 1107 { 1108 strlcpy(info->driver, "B.A.T.M.A.N. advanced", sizeof(info->driver)); 1109 strlcpy(info->version, BATADV_SOURCE_VERSION, sizeof(info->version)); 1110 strlcpy(info->fw_version, "N/A", sizeof(info->fw_version)); 1111 strlcpy(info->bus_info, "batman", sizeof(info->bus_info)); 1112 } 1113 1114 static u32 batadv_get_msglevel(struct net_device *dev) 1115 { 1116 return -EOPNOTSUPP; 1117 } 1118 1119 static void batadv_set_msglevel(struct net_device *dev, u32 value) 1120 { 1121 } 1122 1123 static u32 batadv_get_link(struct net_device *dev) 1124 { 1125 return 1; 1126 } 1127 1128 /* Inspired by drivers/net/ethernet/dlink/sundance.c:1702 1129 * Declare each description string in struct.name[] to get fixed sized buffer 1130 * and compile time checking for strings longer than ETH_GSTRING_LEN. 1131 */ 1132 static const struct { 1133 const char name[ETH_GSTRING_LEN]; 1134 } batadv_counters_strings[] = { 1135 { "tx" }, 1136 { "tx_bytes" }, 1137 { "tx_dropped" }, 1138 { "rx" }, 1139 { "rx_bytes" }, 1140 { "forward" }, 1141 { "forward_bytes" }, 1142 { "mgmt_tx" }, 1143 { "mgmt_tx_bytes" }, 1144 { "mgmt_rx" }, 1145 { "mgmt_rx_bytes" }, 1146 { "frag_tx" }, 1147 { "frag_tx_bytes" }, 1148 { "frag_rx" }, 1149 { "frag_rx_bytes" }, 1150 { "frag_fwd" }, 1151 { "frag_fwd_bytes" }, 1152 { "tt_request_tx" }, 1153 { "tt_request_rx" }, 1154 { "tt_response_tx" }, 1155 { "tt_response_rx" }, 1156 { "tt_roam_adv_tx" }, 1157 { "tt_roam_adv_rx" }, 1158 #ifdef CONFIG_BATMAN_ADV_DAT 1159 { "dat_get_tx" }, 1160 { "dat_get_rx" }, 1161 { "dat_put_tx" }, 1162 { "dat_put_rx" }, 1163 { "dat_cached_reply_tx" }, 1164 #endif 1165 #ifdef CONFIG_BATMAN_ADV_NC 1166 { "nc_code" }, 1167 { "nc_code_bytes" }, 1168 { "nc_recode" }, 1169 { "nc_recode_bytes" }, 1170 { "nc_buffer" }, 1171 { "nc_decode" }, 1172 { "nc_decode_bytes" }, 1173 { "nc_decode_failed" }, 1174 { "nc_sniffed" }, 1175 #endif 1176 }; 1177 1178 static void batadv_get_strings(struct net_device *dev, u32 stringset, u8 *data) 1179 { 1180 if (stringset == ETH_SS_STATS) 1181 memcpy(data, batadv_counters_strings, 1182 sizeof(batadv_counters_strings)); 1183 } 1184 1185 static void batadv_get_ethtool_stats(struct net_device *dev, 1186 struct ethtool_stats *stats, u64 *data) 1187 { 1188 struct batadv_priv *bat_priv = netdev_priv(dev); 1189 int i; 1190 1191 for (i = 0; i < BATADV_CNT_NUM; i++) 1192 data[i] = batadv_sum_counter(bat_priv, i); 1193 } 1194 1195 static int batadv_get_sset_count(struct net_device *dev, int stringset) 1196 { 1197 if (stringset == ETH_SS_STATS) 1198 return BATADV_CNT_NUM; 1199 1200 return -EOPNOTSUPP; 1201 } 1202