linux/net/batman-adv/bat_iv_ogm.c
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   1/* Copyright (C) 2007-2012 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, write to the Free Software
  16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17 * 02110-1301, USA
  18 */
  19
  20#include "main.h"
  21#include "translation-table.h"
  22#include "ring_buffer.h"
  23#include "originator.h"
  24#include "routing.h"
  25#include "gateway_common.h"
  26#include "gateway_client.h"
  27#include "hard-interface.h"
  28#include "send.h"
  29#include "bat_algo.h"
  30
  31static struct batadv_neigh_node *
  32batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
  33                        const uint8_t *neigh_addr,
  34                        struct batadv_orig_node *orig_node,
  35                        struct batadv_orig_node *orig_neigh, __be32 seqno)
  36{
  37        struct batadv_neigh_node *neigh_node;
  38
  39        neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr,
  40                                           ntohl(seqno));
  41        if (!neigh_node)
  42                goto out;
  43
  44        INIT_LIST_HEAD(&neigh_node->bonding_list);
  45
  46        neigh_node->orig_node = orig_neigh;
  47        neigh_node->if_incoming = hard_iface;
  48
  49        spin_lock_bh(&orig_node->neigh_list_lock);
  50        hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
  51        spin_unlock_bh(&orig_node->neigh_list_lock);
  52
  53out:
  54        return neigh_node;
  55}
  56
  57static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
  58{
  59        struct batadv_ogm_packet *batadv_ogm_packet;
  60        uint32_t random_seqno;
  61        int res = -ENOMEM;
  62
  63        /* randomize initial seqno to avoid collision */
  64        get_random_bytes(&random_seqno, sizeof(random_seqno));
  65        atomic_set(&hard_iface->seqno, random_seqno);
  66
  67        hard_iface->packet_len = BATADV_OGM_HLEN;
  68        hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);
  69
  70        if (!hard_iface->packet_buff)
  71                goto out;
  72
  73        batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
  74        batadv_ogm_packet->header.packet_type = BATADV_IV_OGM;
  75        batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION;
  76        batadv_ogm_packet->header.ttl = 2;
  77        batadv_ogm_packet->flags = BATADV_NO_FLAGS;
  78        batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
  79        batadv_ogm_packet->tt_num_changes = 0;
  80        batadv_ogm_packet->ttvn = 0;
  81
  82        res = 0;
  83
  84out:
  85        return res;
  86}
  87
  88static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
  89{
  90        kfree(hard_iface->packet_buff);
  91        hard_iface->packet_buff = NULL;
  92}
  93
  94static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
  95{
  96        struct batadv_ogm_packet *batadv_ogm_packet;
  97
  98        batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
  99        memcpy(batadv_ogm_packet->orig,
 100               hard_iface->net_dev->dev_addr, ETH_ALEN);
 101        memcpy(batadv_ogm_packet->prev_sender,
 102               hard_iface->net_dev->dev_addr, ETH_ALEN);
 103}
 104
 105static void
 106batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
 107{
 108        struct batadv_ogm_packet *batadv_ogm_packet;
 109
 110        batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
 111        batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
 112        batadv_ogm_packet->header.ttl = BATADV_TTL;
 113}
 114
 115/* when do we schedule our own ogm to be sent */
 116static unsigned long
 117batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
 118{
 119        unsigned int msecs;
 120
 121        msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
 122        msecs += random32() % (2 * BATADV_JITTER);
 123
 124        return jiffies + msecs_to_jiffies(msecs);
 125}
 126
 127/* when do we schedule a ogm packet to be sent */
 128static unsigned long batadv_iv_ogm_fwd_send_time(void)
 129{
 130        return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2));
 131}
 132
 133/* apply hop penalty for a normal link */
 134static uint8_t batadv_hop_penalty(uint8_t tq,
 135                                  const struct batadv_priv *bat_priv)
 136{
 137        int hop_penalty = atomic_read(&bat_priv->hop_penalty);
 138        int new_tq;
 139
 140        new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
 141        new_tq /= BATADV_TQ_MAX_VALUE;
 142
 143        return new_tq;
 144}
 145
 146/* is there another aggregated packet here? */
 147static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
 148                                     int tt_num_changes)
 149{
 150        int next_buff_pos = 0;
 151
 152        next_buff_pos += buff_pos + BATADV_OGM_HLEN;
 153        next_buff_pos += batadv_tt_len(tt_num_changes);
 154
 155        return (next_buff_pos <= packet_len) &&
 156               (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
 157}
 158
 159/* send a batman ogm to a given interface */
 160static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
 161                                     struct batadv_hard_iface *hard_iface)
 162{
 163        struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 164        char *fwd_str;
 165        uint8_t packet_num;
 166        int16_t buff_pos;
 167        struct batadv_ogm_packet *batadv_ogm_packet;
 168        struct sk_buff *skb;
 169        uint8_t *packet_pos;
 170
 171        if (hard_iface->if_status != BATADV_IF_ACTIVE)
 172                return;
 173
 174        packet_num = 0;
 175        buff_pos = 0;
 176        packet_pos = forw_packet->skb->data;
 177        batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 178
 179        /* adjust all flags and log packets */
 180        while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
 181                                         batadv_ogm_packet->tt_num_changes)) {
 182
 183                /* we might have aggregated direct link packets with an
 184                 * ordinary base packet
 185                 */
 186                if (forw_packet->direct_link_flags & BIT(packet_num) &&
 187                    forw_packet->if_incoming == hard_iface)
 188                        batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 189                else
 190                        batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 191
 192                if (packet_num > 0 || !forw_packet->own)
 193                        fwd_str = "Forwarding";
 194                else
 195                        fwd_str = "Sending own";
 196
 197                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 198                           "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
 199                           fwd_str, (packet_num > 0 ? "aggregated " : ""),
 200                           batadv_ogm_packet->orig,
 201                           ntohl(batadv_ogm_packet->seqno),
 202                           batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl,
 203                           (batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
 204                            "on" : "off"),
 205                           batadv_ogm_packet->ttvn, hard_iface->net_dev->name,
 206                           hard_iface->net_dev->dev_addr);
 207
 208                buff_pos += BATADV_OGM_HLEN;
 209                buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
 210                packet_num++;
 211                packet_pos = forw_packet->skb->data + buff_pos;
 212                batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 213        }
 214
 215        /* create clone because function is called more than once */
 216        skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
 217        if (skb) {
 218                batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
 219                batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
 220                                   skb->len + ETH_HLEN);
 221                batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
 222        }
 223}
 224
 225/* send a batman ogm packet */
 226static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
 227{
 228        struct batadv_hard_iface *hard_iface;
 229        struct net_device *soft_iface;
 230        struct batadv_priv *bat_priv;
 231        struct batadv_hard_iface *primary_if = NULL;
 232        struct batadv_ogm_packet *batadv_ogm_packet;
 233        unsigned char directlink;
 234        uint8_t *packet_pos;
 235
 236        packet_pos = forw_packet->skb->data;
 237        batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
 238        directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0);
 239
 240        if (!forw_packet->if_incoming) {
 241                pr_err("Error - can't forward packet: incoming iface not specified\n");
 242                goto out;
 243        }
 244
 245        soft_iface = forw_packet->if_incoming->soft_iface;
 246        bat_priv = netdev_priv(soft_iface);
 247
 248        if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
 249                goto out;
 250
 251        primary_if = batadv_primary_if_get_selected(bat_priv);
 252        if (!primary_if)
 253                goto out;
 254
 255        /* multihomed peer assumed
 256         * non-primary OGMs are only broadcasted on their interface
 257         */
 258        if ((directlink && (batadv_ogm_packet->header.ttl == 1)) ||
 259            (forw_packet->own && (forw_packet->if_incoming != primary_if))) {
 260
 261                /* FIXME: what about aggregated packets ? */
 262                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 263                           "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
 264                           (forw_packet->own ? "Sending own" : "Forwarding"),
 265                           batadv_ogm_packet->orig,
 266                           ntohl(batadv_ogm_packet->seqno),
 267                           batadv_ogm_packet->header.ttl,
 268                           forw_packet->if_incoming->net_dev->name,
 269                           forw_packet->if_incoming->net_dev->dev_addr);
 270
 271                /* skb is only used once and than forw_packet is free'd */
 272                batadv_send_skb_packet(forw_packet->skb,
 273                                       forw_packet->if_incoming,
 274                                       batadv_broadcast_addr);
 275                forw_packet->skb = NULL;
 276
 277                goto out;
 278        }
 279
 280        /* broadcast on every interface */
 281        rcu_read_lock();
 282        list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 283                if (hard_iface->soft_iface != soft_iface)
 284                        continue;
 285
 286                batadv_iv_ogm_send_to_if(forw_packet, hard_iface);
 287        }
 288        rcu_read_unlock();
 289
 290out:
 291        if (primary_if)
 292                batadv_hardif_free_ref(primary_if);
 293}
 294
 295/* return true if new_packet can be aggregated with forw_packet */
 296static bool
 297batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
 298                            struct batadv_priv *bat_priv,
 299                            int packet_len, unsigned long send_time,
 300                            bool directlink,
 301                            const struct batadv_hard_iface *if_incoming,
 302                            const struct batadv_forw_packet *forw_packet)
 303{
 304        struct batadv_ogm_packet *batadv_ogm_packet;
 305        int aggregated_bytes = forw_packet->packet_len + packet_len;
 306        struct batadv_hard_iface *primary_if = NULL;
 307        bool res = false;
 308        unsigned long aggregation_end_time;
 309
 310        batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
 311        aggregation_end_time = send_time;
 312        aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 313
 314        /* we can aggregate the current packet to this aggregated packet
 315         * if:
 316         *
 317         * - the send time is within our MAX_AGGREGATION_MS time
 318         * - the resulting packet wont be bigger than
 319         *   MAX_AGGREGATION_BYTES
 320         */
 321        if (time_before(send_time, forw_packet->send_time) &&
 322            time_after_eq(aggregation_end_time, forw_packet->send_time) &&
 323            (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
 324
 325                /* check aggregation compatibility
 326                 * -> direct link packets are broadcasted on
 327                 *    their interface only
 328                 * -> aggregate packet if the current packet is
 329                 *    a "global" packet as well as the base
 330                 *    packet
 331                 */
 332                primary_if = batadv_primary_if_get_selected(bat_priv);
 333                if (!primary_if)
 334                        goto out;
 335
 336                /* packets without direct link flag and high TTL
 337                 * are flooded through the net
 338                 */
 339                if ((!directlink) &&
 340                    (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
 341                    (batadv_ogm_packet->header.ttl != 1) &&
 342
 343                    /* own packets originating non-primary
 344                     * interfaces leave only that interface
 345                     */
 346                    ((!forw_packet->own) ||
 347                     (forw_packet->if_incoming == primary_if))) {
 348                        res = true;
 349                        goto out;
 350                }
 351
 352                /* if the incoming packet is sent via this one
 353                 * interface only - we still can aggregate
 354                 */
 355                if ((directlink) &&
 356                    (new_bat_ogm_packet->header.ttl == 1) &&
 357                    (forw_packet->if_incoming == if_incoming) &&
 358
 359                    /* packets from direct neighbors or
 360                     * own secondary interface packets
 361                     * (= secondary interface packets in general)
 362                     */
 363                    (batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
 364                     (forw_packet->own &&
 365                      forw_packet->if_incoming != primary_if))) {
 366                        res = true;
 367                        goto out;
 368                }
 369        }
 370
 371out:
 372        if (primary_if)
 373                batadv_hardif_free_ref(primary_if);
 374        return res;
 375}
 376
 377/* create a new aggregated packet and add this packet to it */
 378static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
 379                                        int packet_len, unsigned long send_time,
 380                                        bool direct_link,
 381                                        struct batadv_hard_iface *if_incoming,
 382                                        int own_packet)
 383{
 384        struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 385        struct batadv_forw_packet *forw_packet_aggr;
 386        unsigned char *skb_buff;
 387        unsigned int skb_size;
 388
 389        if (!atomic_inc_not_zero(&if_incoming->refcount))
 390                return;
 391
 392        /* own packet should always be scheduled */
 393        if (!own_packet) {
 394                if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
 395                        batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 396                                   "batman packet queue full\n");
 397                        goto out;
 398                }
 399        }
 400
 401        forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
 402        if (!forw_packet_aggr) {
 403                if (!own_packet)
 404                        atomic_inc(&bat_priv->batman_queue_left);
 405                goto out;
 406        }
 407
 408        if ((atomic_read(&bat_priv->aggregated_ogms)) &&
 409            (packet_len < BATADV_MAX_AGGREGATION_BYTES))
 410                skb_size = BATADV_MAX_AGGREGATION_BYTES + ETH_HLEN;
 411        else
 412                skb_size = packet_len + ETH_HLEN;
 413
 414        forw_packet_aggr->skb = dev_alloc_skb(skb_size);
 415        if (!forw_packet_aggr->skb) {
 416                if (!own_packet)
 417                        atomic_inc(&bat_priv->batman_queue_left);
 418                kfree(forw_packet_aggr);
 419                goto out;
 420        }
 421        skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
 422
 423        INIT_HLIST_NODE(&forw_packet_aggr->list);
 424
 425        skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 426        forw_packet_aggr->packet_len = packet_len;
 427        memcpy(skb_buff, packet_buff, packet_len);
 428
 429        forw_packet_aggr->own = own_packet;
 430        forw_packet_aggr->if_incoming = if_incoming;
 431        forw_packet_aggr->num_packets = 0;
 432        forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
 433        forw_packet_aggr->send_time = send_time;
 434
 435        /* save packet direct link flag status */
 436        if (direct_link)
 437                forw_packet_aggr->direct_link_flags |= 1;
 438
 439        /* add new packet to packet list */
 440        spin_lock_bh(&bat_priv->forw_bat_list_lock);
 441        hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
 442        spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 443
 444        /* start timer for this packet */
 445        INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
 446                          batadv_send_outstanding_bat_ogm_packet);
 447        queue_delayed_work(batadv_event_workqueue,
 448                           &forw_packet_aggr->delayed_work,
 449                           send_time - jiffies);
 450
 451        return;
 452out:
 453        batadv_hardif_free_ref(if_incoming);
 454}
 455
 456/* aggregate a new packet into the existing ogm packet */
 457static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
 458                                    const unsigned char *packet_buff,
 459                                    int packet_len, bool direct_link)
 460{
 461        unsigned char *skb_buff;
 462        unsigned long new_direct_link_flag;
 463
 464        skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
 465        memcpy(skb_buff, packet_buff, packet_len);
 466        forw_packet_aggr->packet_len += packet_len;
 467        forw_packet_aggr->num_packets++;
 468
 469        /* save packet direct link flag status */
 470        if (direct_link) {
 471                new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
 472                forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
 473        }
 474}
 475
 476static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
 477                                    unsigned char *packet_buff,
 478                                    int packet_len,
 479                                    struct batadv_hard_iface *if_incoming,
 480                                    int own_packet, unsigned long send_time)
 481{
 482        /* _aggr -> pointer to the packet we want to aggregate with
 483         * _pos -> pointer to the position in the queue
 484         */
 485        struct batadv_forw_packet *forw_packet_aggr = NULL;
 486        struct batadv_forw_packet *forw_packet_pos = NULL;
 487        struct hlist_node *tmp_node;
 488        struct batadv_ogm_packet *batadv_ogm_packet;
 489        bool direct_link;
 490        unsigned long max_aggregation_jiffies;
 491
 492        batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
 493        direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
 494        max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
 495
 496        /* find position for the packet in the forward queue */
 497        spin_lock_bh(&bat_priv->forw_bat_list_lock);
 498        /* own packets are not to be aggregated */
 499        if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
 500                hlist_for_each_entry(forw_packet_pos, tmp_node,
 501                                     &bat_priv->forw_bat_list, list) {
 502                        if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
 503                                                        bat_priv, packet_len,
 504                                                        send_time, direct_link,
 505                                                        if_incoming,
 506                                                        forw_packet_pos)) {
 507                                forw_packet_aggr = forw_packet_pos;
 508                                break;
 509                        }
 510                }
 511        }
 512
 513        /* nothing to aggregate with - either aggregation disabled or no
 514         * suitable aggregation packet found
 515         */
 516        if (!forw_packet_aggr) {
 517                /* the following section can run without the lock */
 518                spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 519
 520                /* if we could not aggregate this packet with one of the others
 521                 * we hold it back for a while, so that it might be aggregated
 522                 * later on
 523                 */
 524                if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
 525                        send_time += max_aggregation_jiffies;
 526
 527                batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
 528                                            send_time, direct_link,
 529                                            if_incoming, own_packet);
 530        } else {
 531                batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
 532                                        packet_len, direct_link);
 533                spin_unlock_bh(&bat_priv->forw_bat_list_lock);
 534        }
 535}
 536
 537static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
 538                                  const struct ethhdr *ethhdr,
 539                                  struct batadv_ogm_packet *batadv_ogm_packet,
 540                                  bool is_single_hop_neigh,
 541                                  bool is_from_best_next_hop,
 542                                  struct batadv_hard_iface *if_incoming)
 543{
 544        struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 545        uint8_t tt_num_changes;
 546
 547        if (batadv_ogm_packet->header.ttl <= 1) {
 548                batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
 549                return;
 550        }
 551
 552        if (!is_from_best_next_hop) {
 553                /* Mark the forwarded packet when it is not coming from our
 554                 * best next hop. We still need to forward the packet for our
 555                 * neighbor link quality detection to work in case the packet
 556                 * originated from a single hop neighbor. Otherwise we can
 557                 * simply drop the ogm.
 558                 */
 559                if (is_single_hop_neigh)
 560                        batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
 561                else
 562                        return;
 563        }
 564
 565        tt_num_changes = batadv_ogm_packet->tt_num_changes;
 566
 567        batadv_ogm_packet->header.ttl--;
 568        memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);
 569
 570        /* apply hop penalty */
 571        batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
 572                                                   bat_priv);
 573
 574        batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 575                   "Forwarding packet: tq: %i, ttl: %i\n",
 576                   batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl);
 577
 578        /* switch of primaries first hop flag when forwarding */
 579        batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
 580        if (is_single_hop_neigh)
 581                batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
 582        else
 583                batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
 584
 585        batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
 586                                BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes),
 587                                if_incoming, 0, batadv_iv_ogm_fwd_send_time());
 588}
 589
 590static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
 591{
 592        struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
 593        struct batadv_ogm_packet *batadv_ogm_packet;
 594        struct batadv_hard_iface *primary_if;
 595        int vis_server, tt_num_changes = 0;
 596        uint32_t seqno;
 597        uint8_t bandwidth;
 598
 599        vis_server = atomic_read(&bat_priv->vis_mode);
 600        primary_if = batadv_primary_if_get_selected(bat_priv);
 601
 602        if (hard_iface == primary_if)
 603                tt_num_changes = batadv_tt_append_diff(bat_priv,
 604                                                       &hard_iface->packet_buff,
 605                                                       &hard_iface->packet_len,
 606                                                       BATADV_OGM_HLEN);
 607
 608        batadv_ogm_packet = (struct batadv_ogm_packet *)hard_iface->packet_buff;
 609
 610        /* change sequence number to network order */
 611        seqno = (uint32_t)atomic_read(&hard_iface->seqno);
 612        batadv_ogm_packet->seqno = htonl(seqno);
 613        atomic_inc(&hard_iface->seqno);
 614
 615        batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn);
 616        batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc);
 617        if (tt_num_changes >= 0)
 618                batadv_ogm_packet->tt_num_changes = tt_num_changes;
 619
 620        if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC)
 621                batadv_ogm_packet->flags |= BATADV_VIS_SERVER;
 622        else
 623                batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER;
 624
 625        if (hard_iface == primary_if &&
 626            atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) {
 627                bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth);
 628                batadv_ogm_packet->gw_flags = bandwidth;
 629        } else {
 630                batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS;
 631        }
 632
 633        batadv_slide_own_bcast_window(hard_iface);
 634        batadv_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
 635                                hard_iface->packet_len, hard_iface, 1,
 636                                batadv_iv_ogm_emit_send_time(bat_priv));
 637
 638        if (primary_if)
 639                batadv_hardif_free_ref(primary_if);
 640}
 641
 642static void
 643batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
 644                          struct batadv_orig_node *orig_node,
 645                          const struct ethhdr *ethhdr,
 646                          const struct batadv_ogm_packet *batadv_ogm_packet,
 647                          struct batadv_hard_iface *if_incoming,
 648                          const unsigned char *tt_buff,
 649                          int is_duplicate)
 650{
 651        struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
 652        struct batadv_neigh_node *router = NULL;
 653        struct batadv_orig_node *orig_node_tmp;
 654        struct hlist_node *node;
 655        int if_num;
 656        uint8_t sum_orig, sum_neigh;
 657        uint8_t *neigh_addr;
 658        uint8_t tq_avg;
 659
 660        batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 661                   "update_originator(): Searching and updating originator entry of received packet\n");
 662
 663        rcu_read_lock();
 664        hlist_for_each_entry_rcu(tmp_neigh_node, node,
 665                                 &orig_node->neigh_list, list) {
 666                neigh_addr = tmp_neigh_node->addr;
 667                if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 668                    tmp_neigh_node->if_incoming == if_incoming &&
 669                    atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
 670                        if (neigh_node)
 671                                batadv_neigh_node_free_ref(neigh_node);
 672                        neigh_node = tmp_neigh_node;
 673                        continue;
 674                }
 675
 676                if (is_duplicate)
 677                        continue;
 678
 679                spin_lock_bh(&tmp_neigh_node->lq_update_lock);
 680                batadv_ring_buffer_set(tmp_neigh_node->tq_recv,
 681                                       &tmp_neigh_node->tq_index, 0);
 682                tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv);
 683                tmp_neigh_node->tq_avg = tq_avg;
 684                spin_unlock_bh(&tmp_neigh_node->lq_update_lock);
 685        }
 686
 687        if (!neigh_node) {
 688                struct batadv_orig_node *orig_tmp;
 689
 690                orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source);
 691                if (!orig_tmp)
 692                        goto unlock;
 693
 694                neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
 695                                                     ethhdr->h_source,
 696                                                     orig_node, orig_tmp,
 697                                                     batadv_ogm_packet->seqno);
 698
 699                batadv_orig_node_free_ref(orig_tmp);
 700                if (!neigh_node)
 701                        goto unlock;
 702        } else
 703                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 704                           "Updating existing last-hop neighbor of originator\n");
 705
 706        rcu_read_unlock();
 707
 708        orig_node->flags = batadv_ogm_packet->flags;
 709        neigh_node->last_seen = jiffies;
 710
 711        spin_lock_bh(&neigh_node->lq_update_lock);
 712        batadv_ring_buffer_set(neigh_node->tq_recv,
 713                               &neigh_node->tq_index,
 714                               batadv_ogm_packet->tq);
 715        neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv);
 716        spin_unlock_bh(&neigh_node->lq_update_lock);
 717
 718        if (!is_duplicate) {
 719                orig_node->last_ttl = batadv_ogm_packet->header.ttl;
 720                neigh_node->last_ttl = batadv_ogm_packet->header.ttl;
 721        }
 722
 723        batadv_bonding_candidate_add(orig_node, neigh_node);
 724
 725        /* if this neighbor already is our next hop there is nothing
 726         * to change
 727         */
 728        router = batadv_orig_node_get_router(orig_node);
 729        if (router == neigh_node)
 730                goto update_tt;
 731
 732        /* if this neighbor does not offer a better TQ we won't consider it */
 733        if (router && (router->tq_avg > neigh_node->tq_avg))
 734                goto update_tt;
 735
 736        /* if the TQ is the same and the link not more symmetric we
 737         * won't consider it either
 738         */
 739        if (router && (neigh_node->tq_avg == router->tq_avg)) {
 740                orig_node_tmp = router->orig_node;
 741                spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 742                if_num = router->if_incoming->if_num;
 743                sum_orig = orig_node_tmp->bcast_own_sum[if_num];
 744                spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 745
 746                orig_node_tmp = neigh_node->orig_node;
 747                spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
 748                if_num = neigh_node->if_incoming->if_num;
 749                sum_neigh = orig_node_tmp->bcast_own_sum[if_num];
 750                spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);
 751
 752                if (sum_orig >= sum_neigh)
 753                        goto update_tt;
 754        }
 755
 756        batadv_update_route(bat_priv, orig_node, neigh_node);
 757
 758update_tt:
 759        /* I have to check for transtable changes only if the OGM has been
 760         * sent through a primary interface
 761         */
 762        if (((batadv_ogm_packet->orig != ethhdr->h_source) &&
 763             (batadv_ogm_packet->header.ttl > 2)) ||
 764            (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP))
 765                batadv_tt_update_orig(bat_priv, orig_node, tt_buff,
 766                                      batadv_ogm_packet->tt_num_changes,
 767                                      batadv_ogm_packet->ttvn,
 768                                      ntohs(batadv_ogm_packet->tt_crc));
 769
 770        if (orig_node->gw_flags != batadv_ogm_packet->gw_flags)
 771                batadv_gw_node_update(bat_priv, orig_node,
 772                                      batadv_ogm_packet->gw_flags);
 773
 774        orig_node->gw_flags = batadv_ogm_packet->gw_flags;
 775
 776        /* restart gateway selection if fast or late switching was enabled */
 777        if ((orig_node->gw_flags) &&
 778            (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
 779            (atomic_read(&bat_priv->gw_sel_class) > 2))
 780                batadv_gw_check_election(bat_priv, orig_node);
 781
 782        goto out;
 783
 784unlock:
 785        rcu_read_unlock();
 786out:
 787        if (neigh_node)
 788                batadv_neigh_node_free_ref(neigh_node);
 789        if (router)
 790                batadv_neigh_node_free_ref(router);
 791}
 792
 793static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
 794                                 struct batadv_orig_node *orig_neigh_node,
 795                                 struct batadv_ogm_packet *batadv_ogm_packet,
 796                                 struct batadv_hard_iface *if_incoming)
 797{
 798        struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 799        struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
 800        struct hlist_node *node;
 801        uint8_t total_count;
 802        uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
 803        unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
 804        int tq_asym_penalty, inv_asym_penalty, ret = 0;
 805        unsigned int combined_tq;
 806
 807        /* find corresponding one hop neighbor */
 808        rcu_read_lock();
 809        hlist_for_each_entry_rcu(tmp_neigh_node, node,
 810                                 &orig_neigh_node->neigh_list, list) {
 811
 812                if (!batadv_compare_eth(tmp_neigh_node->addr,
 813                                        orig_neigh_node->orig))
 814                        continue;
 815
 816                if (tmp_neigh_node->if_incoming != if_incoming)
 817                        continue;
 818
 819                if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
 820                        continue;
 821
 822                neigh_node = tmp_neigh_node;
 823                break;
 824        }
 825        rcu_read_unlock();
 826
 827        if (!neigh_node)
 828                neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
 829                                                     orig_neigh_node->orig,
 830                                                     orig_neigh_node,
 831                                                     orig_neigh_node,
 832                                                     batadv_ogm_packet->seqno);
 833
 834        if (!neigh_node)
 835                goto out;
 836
 837        /* if orig_node is direct neighbor update neigh_node last_seen */
 838        if (orig_node == orig_neigh_node)
 839                neigh_node->last_seen = jiffies;
 840
 841        orig_node->last_seen = jiffies;
 842
 843        /* find packet count of corresponding one hop neighbor */
 844        spin_lock_bh(&orig_node->ogm_cnt_lock);
 845        orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
 846        neigh_rq_count = neigh_node->real_packet_count;
 847        spin_unlock_bh(&orig_node->ogm_cnt_lock);
 848
 849        /* pay attention to not get a value bigger than 100 % */
 850        if (orig_eq_count > neigh_rq_count)
 851                total_count = neigh_rq_count;
 852        else
 853                total_count = orig_eq_count;
 854
 855        /* if we have too few packets (too less data) we set tq_own to zero
 856         * if we receive too few packets it is not considered bidirectional
 857         */
 858        if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
 859            neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
 860                tq_own = 0;
 861        else
 862                /* neigh_node->real_packet_count is never zero as we
 863                 * only purge old information when getting new
 864                 * information
 865                 */
 866                tq_own = (BATADV_TQ_MAX_VALUE * total_count) /  neigh_rq_count;
 867
 868        /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
 869         * affect the nearly-symmetric links only a little, but
 870         * punishes asymmetric links more.  This will give a value
 871         * between 0 and TQ_MAX_VALUE
 872         */
 873        neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
 874        neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
 875        neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
 876                            BATADV_TQ_LOCAL_WINDOW_SIZE *
 877                            BATADV_TQ_LOCAL_WINDOW_SIZE;
 878        inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
 879        inv_asym_penalty /= neigh_rq_max_cube;
 880        tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
 881
 882        combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty;
 883        combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE;
 884        batadv_ogm_packet->tq = combined_tq;
 885
 886        batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 887                   "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
 888                   orig_node->orig, orig_neigh_node->orig, total_count,
 889                   neigh_rq_count, tq_own,
 890                   tq_asym_penalty, batadv_ogm_packet->tq);
 891
 892        /* if link has the minimum required transmission quality
 893         * consider it bidirectional
 894         */
 895        if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
 896                ret = 1;
 897
 898out:
 899        if (neigh_node)
 900                batadv_neigh_node_free_ref(neigh_node);
 901        return ret;
 902}
 903
 904/* processes a batman packet for all interfaces, adjusts the sequence number and
 905 * finds out whether it is a duplicate.
 906 * returns:
 907 *   1 the packet is a duplicate
 908 *   0 the packet has not yet been received
 909 *  -1 the packet is old and has been received while the seqno window
 910 *     was protected. Caller should drop it.
 911 */
 912static int
 913batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
 914                            const struct batadv_ogm_packet *batadv_ogm_packet,
 915                            const struct batadv_hard_iface *if_incoming)
 916{
 917        struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 918        struct batadv_orig_node *orig_node;
 919        struct batadv_neigh_node *tmp_neigh_node;
 920        struct hlist_node *node;
 921        int is_duplicate = 0;
 922        int32_t seq_diff;
 923        int need_update = 0;
 924        int set_mark, ret = -1;
 925        uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
 926        uint8_t *neigh_addr;
 927        uint8_t packet_count;
 928
 929        orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
 930        if (!orig_node)
 931                return 0;
 932
 933        spin_lock_bh(&orig_node->ogm_cnt_lock);
 934        seq_diff = seqno - orig_node->last_real_seqno;
 935
 936        /* signalize caller that the packet is to be dropped. */
 937        if (!hlist_empty(&orig_node->neigh_list) &&
 938            batadv_window_protected(bat_priv, seq_diff,
 939                                    &orig_node->batman_seqno_reset))
 940                goto out;
 941
 942        rcu_read_lock();
 943        hlist_for_each_entry_rcu(tmp_neigh_node, node,
 944                                 &orig_node->neigh_list, list) {
 945
 946                is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits,
 947                                                orig_node->last_real_seqno,
 948                                                seqno);
 949
 950                neigh_addr = tmp_neigh_node->addr;
 951                if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
 952                    tmp_neigh_node->if_incoming == if_incoming)
 953                        set_mark = 1;
 954                else
 955                        set_mark = 0;
 956
 957                /* if the window moved, set the update flag. */
 958                need_update |= batadv_bit_get_packet(bat_priv,
 959                                                     tmp_neigh_node->real_bits,
 960                                                     seq_diff, set_mark);
 961
 962                packet_count = bitmap_weight(tmp_neigh_node->real_bits,
 963                                             BATADV_TQ_LOCAL_WINDOW_SIZE);
 964                tmp_neigh_node->real_packet_count = packet_count;
 965        }
 966        rcu_read_unlock();
 967
 968        if (need_update) {
 969                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 970                           "updating last_seqno: old %u, new %u\n",
 971                           orig_node->last_real_seqno, seqno);
 972                orig_node->last_real_seqno = seqno;
 973        }
 974
 975        ret = is_duplicate;
 976
 977out:
 978        spin_unlock_bh(&orig_node->ogm_cnt_lock);
 979        batadv_orig_node_free_ref(orig_node);
 980        return ret;
 981}
 982
 983static void batadv_iv_ogm_process(const struct ethhdr *ethhdr,
 984                                  struct batadv_ogm_packet *batadv_ogm_packet,
 985                                  const unsigned char *tt_buff,
 986                                  struct batadv_hard_iface *if_incoming)
 987{
 988        struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
 989        struct batadv_hard_iface *hard_iface;
 990        struct batadv_orig_node *orig_neigh_node, *orig_node;
 991        struct batadv_neigh_node *router = NULL, *router_router = NULL;
 992        struct batadv_neigh_node *orig_neigh_router = NULL;
 993        int has_directlink_flag;
 994        int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
 995        int is_broadcast = 0, is_bidirect;
 996        bool is_single_hop_neigh = false;
 997        bool is_from_best_next_hop = false;
 998        int is_duplicate, sameseq, simlar_ttl;
 999        uint32_t if_incoming_seqno;
1000        uint8_t *prev_sender;
1001
1002        /* Silently drop when the batman packet is actually not a
1003         * correct packet.
1004         *
1005         * This might happen if a packet is padded (e.g. Ethernet has a
1006         * minimum frame length of 64 byte) and the aggregation interprets
1007         * it as an additional length.
1008         *
1009         * TODO: A more sane solution would be to have a bit in the
1010         * batadv_ogm_packet to detect whether the packet is the last
1011         * packet in an aggregation.  Here we expect that the padding
1012         * is always zero (or not 0x01)
1013         */
1014        if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM)
1015                return;
1016
1017        /* could be changed by schedule_own_packet() */
1018        if_incoming_seqno = atomic_read(&if_incoming->seqno);
1019
1020        if (batadv_ogm_packet->flags & BATADV_DIRECTLINK)
1021                has_directlink_flag = 1;
1022        else
1023                has_directlink_flag = 0;
1024
1025        if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig))
1026                is_single_hop_neigh = true;
1027
1028        batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1029                   "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",
1030                   ethhdr->h_source, if_incoming->net_dev->name,
1031                   if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig,
1032                   batadv_ogm_packet->prev_sender,
1033                   ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn,
1034                   ntohs(batadv_ogm_packet->tt_crc),
1035                   batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq,
1036                   batadv_ogm_packet->header.ttl,
1037                   batadv_ogm_packet->header.version, has_directlink_flag);
1038
1039        rcu_read_lock();
1040        list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
1041                if (hard_iface->if_status != BATADV_IF_ACTIVE)
1042                        continue;
1043
1044                if (hard_iface->soft_iface != if_incoming->soft_iface)
1045                        continue;
1046
1047                if (batadv_compare_eth(ethhdr->h_source,
1048                                       hard_iface->net_dev->dev_addr))
1049                        is_my_addr = 1;
1050
1051                if (batadv_compare_eth(batadv_ogm_packet->orig,
1052                                       hard_iface->net_dev->dev_addr))
1053                        is_my_orig = 1;
1054
1055                if (batadv_compare_eth(batadv_ogm_packet->prev_sender,
1056                                       hard_iface->net_dev->dev_addr))
1057                        is_my_oldorig = 1;
1058
1059                if (is_broadcast_ether_addr(ethhdr->h_source))
1060                        is_broadcast = 1;
1061        }
1062        rcu_read_unlock();
1063
1064        if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) {
1065                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1066                           "Drop packet: incompatible batman version (%i)\n",
1067                           batadv_ogm_packet->header.version);
1068                return;
1069        }
1070
1071        if (is_my_addr) {
1072                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1073                           "Drop packet: received my own broadcast (sender: %pM)\n",
1074                           ethhdr->h_source);
1075                return;
1076        }
1077
1078        if (is_broadcast) {
1079                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1080                           "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
1081                           ethhdr->h_source);
1082                return;
1083        }
1084
1085        if (is_my_orig) {
1086                unsigned long *word;
1087                int offset;
1088                int32_t bit_pos;
1089                int16_t if_num;
1090                uint8_t *weight;
1091
1092                orig_neigh_node = batadv_get_orig_node(bat_priv,
1093                                                       ethhdr->h_source);
1094                if (!orig_neigh_node)
1095                        return;
1096
1097                /* neighbor has to indicate direct link and it has to
1098                 * come via the corresponding interface
1099                 * save packet seqno for bidirectional check
1100                 */
1101                if (has_directlink_flag &&
1102                    batadv_compare_eth(if_incoming->net_dev->dev_addr,
1103                                       batadv_ogm_packet->orig)) {
1104                        if_num = if_incoming->if_num;
1105                        offset = if_num * BATADV_NUM_WORDS;
1106
1107                        spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
1108                        word = &(orig_neigh_node->bcast_own[offset]);
1109                        bit_pos = if_incoming_seqno - 2;
1110                        bit_pos -= ntohl(batadv_ogm_packet->seqno);
1111                        batadv_set_bit(word, bit_pos);
1112                        weight = &orig_neigh_node->bcast_own_sum[if_num];
1113                        *weight = bitmap_weight(word,
1114                                                BATADV_TQ_LOCAL_WINDOW_SIZE);
1115                        spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
1116                }
1117
1118                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1119                           "Drop packet: originator packet from myself (via neighbor)\n");
1120                batadv_orig_node_free_ref(orig_neigh_node);
1121                return;
1122        }
1123
1124        if (is_my_oldorig) {
1125                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1126                           "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
1127                           ethhdr->h_source);
1128                return;
1129        }
1130
1131        if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
1132                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1133                           "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
1134                           ethhdr->h_source);
1135                return;
1136        }
1137
1138        orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig);
1139        if (!orig_node)
1140                return;
1141
1142        is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet,
1143                                                   if_incoming);
1144
1145        if (is_duplicate == -1) {
1146                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1147                           "Drop packet: packet within seqno protection time (sender: %pM)\n",
1148                           ethhdr->h_source);
1149                goto out;
1150        }
1151
1152        if (batadv_ogm_packet->tq == 0) {
1153                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1154                           "Drop packet: originator packet with tq equal 0\n");
1155                goto out;
1156        }
1157
1158        router = batadv_orig_node_get_router(orig_node);
1159        if (router)
1160                router_router = batadv_orig_node_get_router(router->orig_node);
1161
1162        if ((router && router->tq_avg != 0) &&
1163            (batadv_compare_eth(router->addr, ethhdr->h_source)))
1164                is_from_best_next_hop = true;
1165
1166        prev_sender = batadv_ogm_packet->prev_sender;
1167        /* avoid temporary routing loops */
1168        if (router && router_router &&
1169            (batadv_compare_eth(router->addr, prev_sender)) &&
1170            !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) &&
1171            (batadv_compare_eth(router->addr, router_router->addr))) {
1172                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1173                           "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
1174                           ethhdr->h_source);
1175                goto out;
1176        }
1177
1178        /* if sender is a direct neighbor the sender mac equals
1179         * originator mac
1180         */
1181        if (is_single_hop_neigh)
1182                orig_neigh_node = orig_node;
1183        else
1184                orig_neigh_node = batadv_get_orig_node(bat_priv,
1185                                                       ethhdr->h_source);
1186
1187        if (!orig_neigh_node)
1188                goto out;
1189
1190        orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node);
1191
1192        /* drop packet if sender is not a direct neighbor and if we
1193         * don't route towards it
1194         */
1195        if (!is_single_hop_neigh && (!orig_neigh_router)) {
1196                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1197                           "Drop packet: OGM via unknown neighbor!\n");
1198                goto out_neigh;
1199        }
1200
1201        is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
1202                                            batadv_ogm_packet, if_incoming);
1203
1204        batadv_bonding_save_primary(orig_node, orig_neigh_node,
1205                                    batadv_ogm_packet);
1206
1207        /* update ranking if it is not a duplicate or has the same
1208         * seqno and similar ttl as the non-duplicate
1209         */
1210        sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno);
1211        simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl;
1212        if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl)))
1213                batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
1214                                          batadv_ogm_packet, if_incoming,
1215                                          tt_buff, is_duplicate);
1216
1217        /* is single hop (direct) neighbor */
1218        if (is_single_hop_neigh) {
1219
1220                /* mark direct link on incoming interface */
1221                batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1222                                      is_single_hop_neigh,
1223                                      is_from_best_next_hop, if_incoming);
1224
1225                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1226                           "Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
1227                goto out_neigh;
1228        }
1229
1230        /* multihop originator */
1231        if (!is_bidirect) {
1232                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1233                           "Drop packet: not received via bidirectional link\n");
1234                goto out_neigh;
1235        }
1236
1237        if (is_duplicate) {
1238                batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1239                           "Drop packet: duplicate packet received\n");
1240                goto out_neigh;
1241        }
1242
1243        batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1244                   "Forwarding packet: rebroadcast originator packet\n");
1245        batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet,
1246                              is_single_hop_neigh, is_from_best_next_hop,
1247                              if_incoming);
1248
1249out_neigh:
1250        if ((orig_neigh_node) && (!is_single_hop_neigh))
1251                batadv_orig_node_free_ref(orig_neigh_node);
1252out:
1253        if (router)
1254                batadv_neigh_node_free_ref(router);
1255        if (router_router)
1256                batadv_neigh_node_free_ref(router_router);
1257        if (orig_neigh_router)
1258                batadv_neigh_node_free_ref(orig_neigh_router);
1259
1260        batadv_orig_node_free_ref(orig_node);
1261}
1262
1263static int batadv_iv_ogm_receive(struct sk_buff *skb,
1264                                 struct batadv_hard_iface *if_incoming)
1265{
1266        struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
1267        struct batadv_ogm_packet *batadv_ogm_packet;
1268        struct ethhdr *ethhdr;
1269        int buff_pos = 0, packet_len;
1270        unsigned char *tt_buff, *packet_buff;
1271        bool ret;
1272        uint8_t *packet_pos;
1273
1274        ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
1275        if (!ret)
1276                return NET_RX_DROP;
1277
1278        /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
1279         * that does not have B.A.T.M.A.N. IV enabled ?
1280         */
1281        if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
1282                return NET_RX_DROP;
1283
1284        batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
1285        batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
1286                           skb->len + ETH_HLEN);
1287
1288        packet_len = skb_headlen(skb);
1289        ethhdr = (struct ethhdr *)skb_mac_header(skb);
1290        packet_buff = skb->data;
1291        batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
1292
1293        /* unpack the aggregated packets and process them one by one */
1294        do {
1295                tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN;
1296
1297                batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff,
1298                                      if_incoming);
1299
1300                buff_pos += BATADV_OGM_HLEN;
1301                buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes);
1302
1303                packet_pos = packet_buff + buff_pos;
1304                batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
1305        } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len,
1306                                           batadv_ogm_packet->tt_num_changes));
1307
1308        kfree_skb(skb);
1309        return NET_RX_SUCCESS;
1310}
1311
1312static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
1313        .name = "BATMAN_IV",
1314        .bat_iface_enable = batadv_iv_ogm_iface_enable,
1315        .bat_iface_disable = batadv_iv_ogm_iface_disable,
1316        .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
1317        .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
1318        .bat_ogm_schedule = batadv_iv_ogm_schedule,
1319        .bat_ogm_emit = batadv_iv_ogm_emit,
1320};
1321
1322int __init batadv_iv_init(void)
1323{
1324        int ret;
1325
1326        /* batman originator packet */
1327        ret = batadv_recv_handler_register(BATADV_IV_OGM,
1328                                           batadv_iv_ogm_receive);
1329        if (ret < 0)
1330                goto out;
1331
1332        ret = batadv_algo_register(&batadv_batman_iv);
1333        if (ret < 0)
1334                goto handler_unregister;
1335
1336        goto out;
1337
1338handler_unregister:
1339        batadv_recv_handler_unregister(BATADV_IV_OGM);
1340out:
1341        return ret;
1342}
1343
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