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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 | /* * Copyright (C) 2007-2011 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, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA * */ #include "main.h" #include "send.h" #include "routing.h" #include "translation-table.h" #include "soft-interface.h" #include "hard-interface.h" #include "vis.h" #include "aggregation.h" #include "gateway_common.h" #include "originator.h" static void send_outstanding_bcast_packet(struct work_struct *work); /* apply hop penalty for a normal link */ static uint8_t hop_penalty(const uint8_t tq, struct bat_priv *bat_priv) { int hop_penalty = atomic_read(&bat_priv->hop_penalty); return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE); } /* when do we schedule our own packet to be sent */ static unsigned long own_send_time(struct bat_priv *bat_priv) { return jiffies + msecs_to_jiffies( atomic_read(&bat_priv->orig_interval) - JITTER + (random32() % 2*JITTER)); } /* when do we schedule a forwarded packet to be sent */ static unsigned long forward_send_time(void) { return jiffies + msecs_to_jiffies(random32() % (JITTER/2)); } /* send out an already prepared packet to the given address via the * specified batman interface */ int send_skb_packet(struct sk_buff *skb, struct hard_iface *hard_iface, uint8_t *dst_addr) { struct ethhdr *ethhdr; if (hard_iface->if_status != 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_warning("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 (my_skb_head_push(skb, sizeof(struct ethhdr)) < 0) goto send_skb_err; skb_reset_mac_header(skb); ethhdr = (struct ethhdr *) skb_mac_header(skb); memcpy(ethhdr->h_source, hard_iface->net_dev->dev_addr, ETH_ALEN); memcpy(ethhdr->h_dest, dst_addr, ETH_ALEN); ethhdr->h_proto = __constant_htons(ETH_P_BATMAN); skb_set_network_header(skb, ETH_HLEN); skb->priority = TC_PRIO_CONTROL; skb->protocol = __constant_htons(ETH_P_BATMAN); skb->dev = hard_iface->net_dev; /* 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; } /* Send a packet to a given interface */ static void send_packet_to_if(struct forw_packet *forw_packet, struct hard_iface *hard_iface) { struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); char *fwd_str; uint8_t packet_num; int16_t buff_pos; struct batman_packet *batman_packet; struct sk_buff *skb; if (hard_iface->if_status != IF_ACTIVE) return; packet_num = 0; buff_pos = 0; batman_packet = (struct batman_packet *)forw_packet->skb->data; /* adjust all flags and log packets */ while (aggregated_packet(buff_pos, forw_packet->packet_len, batman_packet->num_tt)) { /* we might have aggregated direct link packets with an * ordinary base packet */ if ((forw_packet->direct_link_flags & (1 << packet_num)) && (forw_packet->if_incoming == hard_iface)) batman_packet->flags |= DIRECTLINK; else batman_packet->flags &= ~DIRECTLINK; fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ? "Sending own" : "Forwarding")); bat_dbg(DBG_BATMAN, bat_priv, "%s %spacket (originator %pM, seqno %d, TQ %d, TTL %d," " IDF %s) on interface %s [%pM]\n", fwd_str, (packet_num > 0 ? "aggregated " : ""), batman_packet->orig, ntohl(batman_packet->seqno), batman_packet->tq, batman_packet->ttl, (batman_packet->flags & DIRECTLINK ? "on" : "off"), hard_iface->net_dev->name, hard_iface->net_dev->dev_addr); buff_pos += sizeof(struct batman_packet) + (batman_packet->num_tt * ETH_ALEN); packet_num++; batman_packet = (struct batman_packet *) (forw_packet->skb->data + buff_pos); } /* create clone because function is called more than once */ skb = skb_clone(forw_packet->skb, GFP_ATOMIC); if (skb) send_skb_packet(skb, hard_iface, broadcast_addr); } /* send a batman packet */ static void send_packet(struct forw_packet *forw_packet) { struct hard_iface *hard_iface; struct net_device *soft_iface; struct bat_priv *bat_priv; struct batman_packet *batman_packet = (struct batman_packet *)(forw_packet->skb->data); unsigned char directlink = (batman_packet->flags & DIRECTLINK ? 1 : 0); if (!forw_packet->if_incoming) { pr_err("Error - can't forward packet: incoming iface not " "specified\n"); return; } soft_iface = forw_packet->if_incoming->soft_iface; bat_priv = netdev_priv(soft_iface); if (forw_packet->if_incoming->if_status != IF_ACTIVE) return; /* multihomed peer assumed */ /* non-primary OGMs are only broadcasted on their interface */ if ((directlink && (batman_packet->ttl == 1)) || (forw_packet->own && (forw_packet->if_incoming->if_num > 0))) { /* FIXME: what about aggregated packets ? */ bat_dbg(DBG_BATMAN, bat_priv, "%s packet (originator %pM, seqno %d, TTL %d) " "on interface %s [%pM]\n", (forw_packet->own ? "Sending own" : "Forwarding"), batman_packet->orig, ntohl(batman_packet->seqno), batman_packet->ttl, forw_packet->if_incoming->net_dev->name, forw_packet->if_incoming->net_dev->dev_addr); /* skb is only used once and than forw_packet is free'd */ send_skb_packet(forw_packet->skb, forw_packet->if_incoming, broadcast_addr); forw_packet->skb = NULL; return; } /* broadcast on every interface */ rcu_read_lock(); list_for_each_entry_rcu(hard_iface, &hardif_list, list) { if (hard_iface->soft_iface != soft_iface) continue; send_packet_to_if(forw_packet, hard_iface); } rcu_read_unlock(); } static void rebuild_batman_packet(struct bat_priv *bat_priv, struct hard_iface *hard_iface) { int new_len; unsigned char *new_buff; struct batman_packet *batman_packet; new_len = sizeof(struct batman_packet) + (bat_priv->num_local_tt * ETH_ALEN); new_buff = kmalloc(new_len, GFP_ATOMIC); /* keep old buffer if kmalloc should fail */ if (new_buff) { memcpy(new_buff, hard_iface->packet_buff, sizeof(struct batman_packet)); batman_packet = (struct batman_packet *)new_buff; batman_packet->num_tt = tt_local_fill_buffer(bat_priv, new_buff + sizeof(struct batman_packet), new_len - sizeof(struct batman_packet)); kfree(hard_iface->packet_buff); hard_iface->packet_buff = new_buff; hard_iface->packet_len = new_len; } } void schedule_own_packet(struct hard_iface *hard_iface) { struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct hard_iface *primary_if; unsigned long send_time; struct batman_packet *batman_packet; int vis_server; if ((hard_iface->if_status == IF_NOT_IN_USE) || (hard_iface->if_status == IF_TO_BE_REMOVED)) return; vis_server = atomic_read(&bat_priv->vis_mode); primary_if = primary_if_get_selected(bat_priv); /** * 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 == IF_TO_BE_ACTIVATED) hard_iface->if_status = IF_ACTIVE; /* if local tt has changed and interface is a primary interface */ if ((atomic_read(&bat_priv->tt_local_changed)) && (hard_iface == primary_if)) rebuild_batman_packet(bat_priv, hard_iface); /** * NOTE: packet_buff might just have been re-allocated in * rebuild_batman_packet() */ batman_packet = (struct batman_packet *)hard_iface->packet_buff; /* change sequence number to network order */ batman_packet->seqno = htonl((uint32_t)atomic_read(&hard_iface->seqno)); if (vis_server == VIS_TYPE_SERVER_SYNC) batman_packet->flags |= VIS_SERVER; else batman_packet->flags &= ~VIS_SERVER; if ((hard_iface == primary_if) && (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)) batman_packet->gw_flags = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); else batman_packet->gw_flags = 0; atomic_inc(&hard_iface->seqno); slide_own_bcast_window(hard_iface); send_time = own_send_time(bat_priv); add_bat_packet_to_list(bat_priv, hard_iface->packet_buff, hard_iface->packet_len, hard_iface, 1, send_time); if (primary_if) hardif_free_ref(primary_if); } void schedule_forward_packet(struct orig_node *orig_node, struct ethhdr *ethhdr, struct batman_packet *batman_packet, uint8_t directlink, int tt_buff_len, struct hard_iface *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); struct neigh_node *router; unsigned char in_tq, in_ttl, tq_avg = 0; unsigned long send_time; if (batman_packet->ttl <= 1) { bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n"); return; } router = orig_node_get_router(orig_node); in_tq = batman_packet->tq; in_ttl = batman_packet->ttl; batman_packet->ttl--; memcpy(batman_packet->prev_sender, ethhdr->h_source, ETH_ALEN); /* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast * of our best tq value */ if (router && router->tq_avg != 0) { /* rebroadcast ogm of best ranking neighbor as is */ if (!compare_eth(router->addr, ethhdr->h_source)) { batman_packet->tq = router->tq_avg; if (router->last_ttl) batman_packet->ttl = router->last_ttl - 1; } tq_avg = router->tq_avg; } if (router) neigh_node_free_ref(router); /* apply hop penalty */ batman_packet->tq = hop_penalty(batman_packet->tq, bat_priv); bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: tq_orig: %i, tq_avg: %i, " "tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n", in_tq, tq_avg, batman_packet->tq, in_ttl - 1, batman_packet->ttl); batman_packet->seqno = htonl(batman_packet->seqno); /* switch of primaries first hop flag when forwarding */ batman_packet->flags &= ~PRIMARIES_FIRST_HOP; if (directlink) batman_packet->flags |= DIRECTLINK; else batman_packet->flags &= ~DIRECTLINK; send_time = forward_send_time(); add_bat_packet_to_list(bat_priv, (unsigned char *)batman_packet, sizeof(struct batman_packet) + tt_buff_len, if_incoming, 0, send_time); } static void forw_packet_free(struct forw_packet *forw_packet) { if (forw_packet->skb) kfree_skb(forw_packet->skb); if (forw_packet->if_incoming) hardif_free_ref(forw_packet->if_incoming); kfree(forw_packet); } static void _add_bcast_packet_to_list(struct bat_priv *bat_priv, struct forw_packet *forw_packet, unsigned long send_time) { INIT_HLIST_NODE(&forw_packet->list); /* 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 */ INIT_DELAYED_WORK(&forw_packet->delayed_work, send_outstanding_bcast_packet); queue_delayed_work(bat_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 beeing 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 add_bcast_packet_to_list(struct bat_priv *bat_priv, struct sk_buff *skb) { struct hard_iface *primary_if = NULL; struct forw_packet *forw_packet; struct bcast_packet *bcast_packet; if (!atomic_dec_not_zero(&bat_priv->bcast_queue_left)) { bat_dbg(DBG_BATMAN, bat_priv, "bcast packet queue full\n"); goto out; } primary_if = primary_if_get_selected(bat_priv); if (!primary_if) goto out_and_inc; forw_packet = kmalloc(sizeof(struct forw_packet), GFP_ATOMIC); if (!forw_packet) goto out_and_inc; skb = skb_copy(skb, GFP_ATOMIC); if (!skb) goto packet_free; /* as we have a copy now, it is safe to decrease the TTL */ bcast_packet = (struct bcast_packet *)skb->data; bcast_packet->ttl--; skb_reset_mac_header(skb); forw_packet->skb = skb; forw_packet->if_incoming = primary_if; /* how often did we send the bcast packet ? */ forw_packet->num_packets = 0; _add_bcast_packet_to_list(bat_priv, forw_packet, 1); return NETDEV_TX_OK; packet_free: kfree(forw_packet); out_and_inc: atomic_inc(&bat_priv->bcast_queue_left); out: if (primary_if) hardif_free_ref(primary_if); return NETDEV_TX_BUSY; } static void send_outstanding_bcast_packet(struct work_struct *work) { struct hard_iface *hard_iface; struct delayed_work *delayed_work = container_of(work, struct delayed_work, work); struct forw_packet *forw_packet = container_of(delayed_work, struct forw_packet, delayed_work); struct sk_buff *skb1; struct net_device *soft_iface = forw_packet->if_incoming->soft_iface; struct bat_priv *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) == MESH_DEACTIVATING) goto out; /* rebroadcast packet */ rcu_read_lock(); list_for_each_entry_rcu(hard_iface, &hardif_list, list) { if (hard_iface->soft_iface != soft_iface) continue; /* send a copy of the saved skb */ skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC); if (skb1) send_skb_packet(skb1, hard_iface, broadcast_addr); } rcu_read_unlock(); forw_packet->num_packets++; /* if we still have some more bcasts to send */ if (forw_packet->num_packets < 3) { _add_bcast_packet_to_list(bat_priv, forw_packet, ((5 * HZ) / 1000)); return; } out: forw_packet_free(forw_packet); atomic_inc(&bat_priv->bcast_queue_left); } void send_outstanding_bat_packet(struct work_struct *work) { struct delayed_work *delayed_work = container_of(work, struct delayed_work, work); struct forw_packet *forw_packet = container_of(delayed_work, struct forw_packet, delayed_work); struct bat_priv *bat_priv; 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) == MESH_DEACTIVATING) goto out; send_packet(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 */ if (forw_packet->own) schedule_own_packet(forw_packet->if_incoming); out: /* don't count own packet */ if (!forw_packet->own) atomic_inc(&bat_priv->batman_queue_left); forw_packet_free(forw_packet); } void purge_outstanding_packets(struct bat_priv *bat_priv, struct hard_iface *hard_iface) { struct forw_packet *forw_packet; struct hlist_node *tmp_node, *safe_tmp_node; bool pending; if (hard_iface) bat_dbg(DBG_BATMAN, bat_priv, "purge_outstanding_packets(): %s\n", hard_iface->net_dev->name); else bat_dbg(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, tmp_node, safe_tmp_node, &bat_priv->forw_bcast_list, list) { /** * if purge_outstanding_packets() was called with an argmument * 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); /** * 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); 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, tmp_node, safe_tmp_node, &bat_priv->forw_bat_list, list) { /** * if purge_outstanding_packets() was called with an argmument * 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_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); forw_packet_free(forw_packet); } } spin_unlock_bh(&bat_priv->forw_bat_list_lock); } |