Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 | /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors: * * Marek Lindner, Simon Wunderlich * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #include "main.h" #include "distributed-arp-table.h" #include "send.h" #include "routing.h" #include "translation-table.h" #include "soft-interface.h" #include "hard-interface.h" #include "gateway_common.h" #include "gateway_client.h" #include "originator.h" #include "network-coding.h" #include "fragmentation.h" #include "multicast.h" static void batadv_send_outstanding_bcast_packet(struct work_struct *work); /* send out an already prepared packet to the given address via the * specified batman interface */ int batadv_send_skb_packet(struct sk_buff *skb, struct batadv_hard_iface *hard_iface, const uint8_t *dst_addr) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct ethhdr *ethhdr; if (hard_iface->if_status != BATADV_IF_ACTIVE) goto send_skb_err; if (unlikely(!hard_iface->net_dev)) goto send_skb_err; if (!(hard_iface->net_dev->flags & IFF_UP)) { pr_warn("Interface %s is not up - can't send packet via that interface!\n", hard_iface->net_dev->name); goto send_skb_err; } /* push to the ethernet header. */ if (batadv_skb_head_push(skb, ETH_HLEN) < 0) goto send_skb_err; skb_reset_mac_header(skb); ethhdr = eth_hdr(skb); ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr); ether_addr_copy(ethhdr->h_dest, dst_addr); ethhdr->h_proto = htons(ETH_P_BATMAN); skb_set_network_header(skb, ETH_HLEN); skb->protocol = htons(ETH_P_BATMAN); skb->dev = hard_iface->net_dev; /* Save a clone of the skb to use when decoding coded packets */ batadv_nc_skb_store_for_decoding(bat_priv, skb); /* dev_queue_xmit() returns a negative result on error. However on * congestion and traffic shaping, it drops and returns NET_XMIT_DROP * (which is > 0). This will not be treated as an error. */ return dev_queue_xmit(skb); send_skb_err: kfree_skb(skb); return NET_XMIT_DROP; } /** * batadv_send_skb_to_orig - Lookup next-hop and transmit skb. * @skb: Packet to be transmitted. * @orig_node: Final destination of the packet. * @recv_if: Interface used when receiving the packet (can be NULL). * * Looks up the best next-hop towards the passed originator and passes the * skb on for preparation of MAC header. If the packet originated from this * host, NULL can be passed as recv_if and no interface alternating is * attempted. * * Returns NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or * NET_XMIT_POLICED if the skb is buffered for later transmit. */ int batadv_send_skb_to_orig(struct sk_buff *skb, struct batadv_orig_node *orig_node, struct batadv_hard_iface *recv_if) { struct batadv_priv *bat_priv = orig_node->bat_priv; struct batadv_neigh_node *neigh_node; int ret = NET_XMIT_DROP; /* batadv_find_router() increases neigh_nodes refcount if found. */ neigh_node = batadv_find_router(bat_priv, orig_node, recv_if); if (!neigh_node) goto out; /* Check if the skb is too large to send in one piece and fragment * it if needed. */ if (atomic_read(&bat_priv->fragmentation) && skb->len > neigh_node->if_incoming->net_dev->mtu) { /* Fragment and send packet. */ if (batadv_frag_send_packet(skb, orig_node, neigh_node)) ret = NET_XMIT_SUCCESS; goto out; } /* try to network code the packet, if it is received on an interface * (i.e. being forwarded). If the packet originates from this node or if * network coding fails, then send the packet as usual. */ if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) { ret = NET_XMIT_POLICED; } else { batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr); ret = NET_XMIT_SUCCESS; } out: if (neigh_node) batadv_neigh_node_free_ref(neigh_node); return ret; } /** * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the * common fields for unicast packets * @skb: the skb carrying the unicast header to initialize * @hdr_size: amount of bytes to push at the beginning of the skb * @orig_node: the destination node * * Returns false if the buffer extension was not possible or true otherwise. */ static bool batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size, struct batadv_orig_node *orig_node) { struct batadv_unicast_packet *unicast_packet; uint8_t ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn); if (batadv_skb_head_push(skb, hdr_size) < 0) return false; unicast_packet = (struct batadv_unicast_packet *)skb->data; unicast_packet->version = BATADV_COMPAT_VERSION; /* batman packet type: unicast */ unicast_packet->packet_type = BATADV_UNICAST; /* set unicast ttl */ unicast_packet->ttl = BATADV_TTL; /* copy the destination for faster routing */ ether_addr_copy(unicast_packet->dest, orig_node->orig); /* set the destination tt version number */ unicast_packet->ttvn = ttvn; return true; } /** * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header * @skb: the skb containing the payload to encapsulate * @orig_node: the destination node * * Returns false if the payload could not be encapsulated or true otherwise. */ static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb, struct batadv_orig_node *orig_node) { size_t uni_size = sizeof(struct batadv_unicast_packet); return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node); } /** * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a * unicast 4addr header * @bat_priv: the bat priv with all the soft interface information * @skb: the skb containing the payload to encapsulate * @orig_node: the destination node * @packet_subtype: the unicast 4addr packet subtype to use * * Returns false if the payload could not be encapsulated or true otherwise. */ bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv, struct sk_buff *skb, struct batadv_orig_node *orig, int packet_subtype) { struct batadv_hard_iface *primary_if; struct batadv_unicast_4addr_packet *uc_4addr_packet; bool ret = false; primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out; /* Pull the header space and fill the unicast_packet substructure. * We can do that because the first member of the uc_4addr_packet * is of type struct unicast_packet */ if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet), orig)) goto out; uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data; uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR; ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr); uc_4addr_packet->subtype = packet_subtype; uc_4addr_packet->reserved = 0; ret = true; out: if (primary_if) batadv_hardif_free_ref(primary_if); return ret; } /** * batadv_send_skb_unicast - encapsulate and send an skb via unicast * @bat_priv: the bat priv with all the soft interface information * @skb: payload to send * @packet_type: the batman unicast packet type to use * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast * 4addr packets) * @orig_node: the originator to send the packet to * @vid: the vid to be used to search the translation table * * Wrap the given skb into a batman-adv unicast or unicast-4addr header * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied * as packet_type. Then send this frame to the given orig_node and release a * reference to this orig_node. * * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. */ int batadv_send_skb_unicast(struct batadv_priv *bat_priv, struct sk_buff *skb, int packet_type, int packet_subtype, struct batadv_orig_node *orig_node, unsigned short vid) { struct ethhdr *ethhdr; struct batadv_unicast_packet *unicast_packet; int ret = NET_XMIT_DROP; if (!orig_node) goto out; switch (packet_type) { case BATADV_UNICAST: if (!batadv_send_skb_prepare_unicast(skb, orig_node)) goto out; break; case BATADV_UNICAST_4ADDR: if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb, orig_node, packet_subtype)) goto out; break; default: /* this function supports UNICAST and UNICAST_4ADDR only. It * should never be invoked with any other packet type */ goto out; } /* skb->data might have been reallocated by * batadv_send_skb_prepare_unicast{,_4addr}() */ ethhdr = eth_hdr(skb); unicast_packet = (struct batadv_unicast_packet *)skb->data; /* inform the destination node that we are still missing a correct route * for this client. The destination will receive this packet and will * try to reroute it because the ttvn contained in the header is less * than the current one */ if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid)) unicast_packet->ttvn = unicast_packet->ttvn - 1; if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP) ret = NET_XMIT_SUCCESS; out: if (orig_node) batadv_orig_node_free_ref(orig_node); if (ret == NET_XMIT_DROP) kfree_skb(skb); return ret; } /** * batadv_send_skb_via_tt_generic - send an skb via TT lookup * @bat_priv: the bat priv with all the soft interface information * @skb: payload to send * @packet_type: the batman unicast packet type to use * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast * 4addr packets) * @dst_hint: can be used to override the destination contained in the skb * @vid: the vid to be used to search the translation table * * Look up the recipient node for the destination address in the ethernet * header via the translation table. Wrap the given skb into a batman-adv * unicast or unicast-4addr header depending on whether BATADV_UNICAST or * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame * to the according destination node. * * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. */ int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv, struct sk_buff *skb, int packet_type, int packet_subtype, uint8_t *dst_hint, unsigned short vid) { struct ethhdr *ethhdr = (struct ethhdr *)skb->data; struct batadv_orig_node *orig_node; uint8_t *src, *dst; src = ethhdr->h_source; dst = ethhdr->h_dest; /* if we got an hint! let's send the packet to this client (if any) */ if (dst_hint) { src = NULL; dst = dst_hint; } orig_node = batadv_transtable_search(bat_priv, src, dst, vid); return batadv_send_skb_unicast(bat_priv, skb, packet_type, packet_subtype, orig_node, vid); } /** * batadv_send_skb_via_gw - send an skb via gateway lookup * @bat_priv: the bat priv with all the soft interface information * @skb: payload to send * @vid: the vid to be used to search the translation table * * Look up the currently selected gateway. Wrap the given skb into a batman-adv * unicast header and send this frame to this gateway node. * * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise. */ int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb, unsigned short vid) { struct batadv_orig_node *orig_node; orig_node = batadv_gw_get_selected_orig(bat_priv); return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0, orig_node, vid); } void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) || (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)) return; /* the interface gets activated here to avoid race conditions between * the moment of activating the interface in * hardif_activate_interface() where the originator mac is set and * outdated packets (especially uninitialized mac addresses) in the * packet queue */ if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED) hard_iface->if_status = BATADV_IF_ACTIVE; bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface); } static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet) { if (forw_packet->skb) kfree_skb(forw_packet->skb); if (forw_packet->if_incoming) batadv_hardif_free_ref(forw_packet->if_incoming); if (forw_packet->if_outgoing) batadv_hardif_free_ref(forw_packet->if_outgoing); kfree(forw_packet); } static void _batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, struct batadv_forw_packet *forw_packet, unsigned long send_time) { /* add new packet to packet list */ spin_lock_bh(&bat_priv->forw_bcast_list_lock); hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list); spin_unlock_bh(&bat_priv->forw_bcast_list_lock); /* start timer for this packet */ queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work, send_time); } /* add a broadcast packet to the queue and setup timers. broadcast packets * are sent multiple times to increase probability for being received. * * This function returns NETDEV_TX_OK on success and NETDEV_TX_BUSY on * errors. * * The skb is not consumed, so the caller should make sure that the * skb is freed. */ int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv, const struct sk_buff *skb, unsigned long delay) { struct batadv_hard_iface *primary_if = NULL; struct batadv_forw_packet *forw_packet; struct batadv_bcast_packet *bcast_packet; struct sk_buff *newskb; if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "bcast packet queue full\n"); goto out; } primary_if = batadv_primary_if_get_selected(bat_priv); if (!primary_if) goto out_and_inc; forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC); if (!forw_packet) goto out_and_inc; newskb = skb_copy(skb, GFP_ATOMIC); if (!newskb) goto packet_free; /* as we have a copy now, it is safe to decrease the TTL */ bcast_packet = (struct batadv_bcast_packet *)newskb->data; bcast_packet->ttl--; skb_reset_mac_header(newskb); forw_packet->skb = newskb; forw_packet->if_incoming = primary_if; forw_packet->if_outgoing = NULL; /* how often did we send the bcast packet ? */ forw_packet->num_packets = 0; INIT_DELAYED_WORK(&forw_packet->delayed_work, batadv_send_outstanding_bcast_packet); _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay); return NETDEV_TX_OK; packet_free: kfree(forw_packet); out_and_inc: atomic_inc(&bat_priv->bcast_queue_left); out: if (primary_if) batadv_hardif_free_ref(primary_if); return NETDEV_TX_BUSY; } static void batadv_send_outstanding_bcast_packet(struct work_struct *work) { struct batadv_hard_iface *hard_iface; struct delayed_work *delayed_work; struct batadv_forw_packet *forw_packet; struct sk_buff *skb1; struct net_device *soft_iface; struct batadv_priv *bat_priv; delayed_work = container_of(work, struct delayed_work, work); forw_packet = container_of(delayed_work, struct batadv_forw_packet, delayed_work); soft_iface = forw_packet->if_incoming->soft_iface; bat_priv = netdev_priv(soft_iface); spin_lock_bh(&bat_priv->forw_bcast_list_lock); hlist_del(&forw_packet->list); spin_unlock_bh(&bat_priv->forw_bcast_list_lock); if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) goto out; if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet)) goto out; /* rebroadcast packet */ rcu_read_lock(); list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { if (hard_iface->soft_iface != soft_iface) continue; if (forw_packet->num_packets >= hard_iface->num_bcasts) continue; /* send a copy of the saved skb */ skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); if (skb1) batadv_send_skb_packet(skb1, hard_iface, batadv_broadcast_addr); } rcu_read_unlock(); forw_packet->num_packets++; /* if we still have some more bcasts to send */ if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) { _batadv_add_bcast_packet_to_list(bat_priv, forw_packet, msecs_to_jiffies(5)); return; } out: batadv_forw_packet_free(forw_packet); atomic_inc(&bat_priv->bcast_queue_left); } void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work) { struct delayed_work *delayed_work; struct batadv_forw_packet *forw_packet; struct batadv_priv *bat_priv; delayed_work = container_of(work, struct delayed_work, work); forw_packet = container_of(delayed_work, struct batadv_forw_packet, delayed_work); bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface); spin_lock_bh(&bat_priv->forw_bat_list_lock); hlist_del(&forw_packet->list); spin_unlock_bh(&bat_priv->forw_bat_list_lock); if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) goto out; bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet); /* we have to have at least one packet in the queue to determine the * queues wake up time unless we are shutting down. * * only re-schedule if this is the "original" copy, e.g. the OGM of the * primary interface should only be rescheduled once per period, but * this function will be called for the forw_packet instances of the * other secondary interfaces as well. */ if (forw_packet->own && forw_packet->if_incoming == forw_packet->if_outgoing) batadv_schedule_bat_ogm(forw_packet->if_incoming); out: /* don't count own packet */ if (!forw_packet->own) atomic_inc(&bat_priv->batman_queue_left); batadv_forw_packet_free(forw_packet); } void batadv_purge_outstanding_packets(struct batadv_priv *bat_priv, const struct batadv_hard_iface *hard_iface) { struct batadv_forw_packet *forw_packet; struct hlist_node *safe_tmp_node; bool pending; if (hard_iface) batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "purge_outstanding_packets(): %s\n", hard_iface->net_dev->name); else batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "purge_outstanding_packets()\n"); /* free bcast list */ spin_lock_bh(&bat_priv->forw_bcast_list_lock); hlist_for_each_entry_safe(forw_packet, safe_tmp_node, &bat_priv->forw_bcast_list, list) { /* if purge_outstanding_packets() was called with an argument * we delete only packets belonging to the given interface */ if ((hard_iface) && (forw_packet->if_incoming != hard_iface)) continue; spin_unlock_bh(&bat_priv->forw_bcast_list_lock); /* batadv_send_outstanding_bcast_packet() will lock the list to * delete the item from the list */ pending = cancel_delayed_work_sync(&forw_packet->delayed_work); spin_lock_bh(&bat_priv->forw_bcast_list_lock); if (pending) { hlist_del(&forw_packet->list); if (!forw_packet->own) atomic_inc(&bat_priv->bcast_queue_left); batadv_forw_packet_free(forw_packet); } } spin_unlock_bh(&bat_priv->forw_bcast_list_lock); /* free batman packet list */ spin_lock_bh(&bat_priv->forw_bat_list_lock); hlist_for_each_entry_safe(forw_packet, safe_tmp_node, &bat_priv->forw_bat_list, list) { /* if purge_outstanding_packets() was called with an argument * we delete only packets belonging to the given interface */ if ((hard_iface) && (forw_packet->if_incoming != hard_iface) && (forw_packet->if_outgoing != hard_iface)) continue; spin_unlock_bh(&bat_priv->forw_bat_list_lock); /* send_outstanding_bat_packet() will lock the list to * delete the item from the list */ pending = cancel_delayed_work_sync(&forw_packet->delayed_work); spin_lock_bh(&bat_priv->forw_bat_list_lock); if (pending) { hlist_del(&forw_packet->list); if (!forw_packet->own) atomic_inc(&bat_priv->batman_queue_left); batadv_forw_packet_free(forw_packet); } } spin_unlock_bh(&bat_priv->forw_bat_list_lock); } |