| /* Copyright (C) 2007-2012 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 "translation-table.h" |
| #include "ring_buffer.h" |
| #include "originator.h" |
| #include "routing.h" |
| #include "gateway_common.h" |
| #include "gateway_client.h" |
| #include "hard-interface.h" |
| #include "send.h" |
| #include "bat_algo.h" |
| |
| static struct batadv_neigh_node * |
| batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface, |
| const uint8_t *neigh_addr, |
| struct batadv_orig_node *orig_node, |
| struct batadv_orig_node *orig_neigh, __be32 seqno) |
| { |
| struct batadv_neigh_node *neigh_node; |
| |
| neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, |
| ntohl(seqno)); |
| if (!neigh_node) |
| goto out; |
| |
| INIT_LIST_HEAD(&neigh_node->bonding_list); |
| |
| neigh_node->orig_node = orig_neigh; |
| neigh_node->if_incoming = hard_iface; |
| |
| spin_lock_bh(&orig_node->neigh_list_lock); |
| hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); |
| spin_unlock_bh(&orig_node->neigh_list_lock); |
| |
| out: |
| return neigh_node; |
| } |
| |
| static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| unsigned char *ogm_buff; |
| uint32_t random_seqno; |
| int res = -ENOMEM; |
| |
| /* randomize initial seqno to avoid collision */ |
| get_random_bytes(&random_seqno, sizeof(random_seqno)); |
| atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno); |
| |
| hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN; |
| ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC); |
| if (!ogm_buff) |
| goto out; |
| |
| hard_iface->bat_iv.ogm_buff = ogm_buff; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
| batadv_ogm_packet->header.packet_type = BATADV_IV_OGM; |
| batadv_ogm_packet->header.version = BATADV_COMPAT_VERSION; |
| batadv_ogm_packet->header.ttl = 2; |
| batadv_ogm_packet->flags = BATADV_NO_FLAGS; |
| batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE; |
| batadv_ogm_packet->tt_num_changes = 0; |
| batadv_ogm_packet->ttvn = 0; |
| |
| res = 0; |
| |
| out: |
| return res; |
| } |
| |
| static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface) |
| { |
| kfree(hard_iface->bat_iv.ogm_buff); |
| hard_iface->bat_iv.ogm_buff = NULL; |
| } |
| |
| static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
| memcpy(batadv_ogm_packet->orig, |
| hard_iface->net_dev->dev_addr, ETH_ALEN); |
| memcpy(batadv_ogm_packet->prev_sender, |
| hard_iface->net_dev->dev_addr, ETH_ALEN); |
| } |
| |
| static void |
| batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff; |
| batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP; |
| batadv_ogm_packet->header.ttl = BATADV_TTL; |
| } |
| |
| /* when do we schedule our own ogm to be sent */ |
| static unsigned long |
| batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv) |
| { |
| unsigned int msecs; |
| |
| msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER; |
| msecs += random32() % (2 * BATADV_JITTER); |
| |
| return jiffies + msecs_to_jiffies(msecs); |
| } |
| |
| /* when do we schedule a ogm packet to be sent */ |
| static unsigned long batadv_iv_ogm_fwd_send_time(void) |
| { |
| return jiffies + msecs_to_jiffies(random32() % (BATADV_JITTER / 2)); |
| } |
| |
| /* apply hop penalty for a normal link */ |
| static uint8_t batadv_hop_penalty(uint8_t tq, |
| const struct batadv_priv *bat_priv) |
| { |
| int hop_penalty = atomic_read(&bat_priv->hop_penalty); |
| int new_tq; |
| |
| new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty); |
| new_tq /= BATADV_TQ_MAX_VALUE; |
| |
| return new_tq; |
| } |
| |
| /* is there another aggregated packet here? */ |
| static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len, |
| int tt_num_changes) |
| { |
| int next_buff_pos = 0; |
| |
| next_buff_pos += buff_pos + BATADV_OGM_HLEN; |
| next_buff_pos += batadv_tt_len(tt_num_changes); |
| |
| return (next_buff_pos <= packet_len) && |
| (next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES); |
| } |
| |
| /* send a batman ogm to a given interface */ |
| static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet, |
| struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| char *fwd_str; |
| uint8_t packet_num; |
| int16_t buff_pos; |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| struct sk_buff *skb; |
| uint8_t *packet_pos; |
| |
| if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| return; |
| |
| packet_num = 0; |
| buff_pos = 0; |
| packet_pos = forw_packet->skb->data; |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; |
| |
| /* adjust all flags and log packets */ |
| while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len, |
| batadv_ogm_packet->tt_num_changes)) { |
| /* we might have aggregated direct link packets with an |
| * ordinary base packet |
| */ |
| if (forw_packet->direct_link_flags & BIT(packet_num) && |
| forw_packet->if_incoming == hard_iface) |
| batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
| else |
| batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
| |
| if (packet_num > 0 || !forw_packet->own) |
| fwd_str = "Forwarding"; |
| else |
| fwd_str = "Sending own"; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n", |
| fwd_str, (packet_num > 0 ? "aggregated " : ""), |
| batadv_ogm_packet->orig, |
| ntohl(batadv_ogm_packet->seqno), |
| batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl, |
| (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? |
| "on" : "off"), |
| batadv_ogm_packet->ttvn, hard_iface->net_dev->name, |
| hard_iface->net_dev->dev_addr); |
| |
| buff_pos += BATADV_OGM_HLEN; |
| buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
| packet_num++; |
| packet_pos = forw_packet->skb->data + buff_pos; |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; |
| } |
| |
| /* create clone because function is called more than once */ |
| skb = skb_clone(forw_packet->skb, GFP_ATOMIC); |
| if (skb) { |
| batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX); |
| batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES, |
| skb->len + ETH_HLEN); |
| batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr); |
| } |
| } |
| |
| /* send a batman ogm packet */ |
| static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet) |
| { |
| struct batadv_hard_iface *hard_iface; |
| struct net_device *soft_iface; |
| struct batadv_priv *bat_priv; |
| struct batadv_hard_iface *primary_if = NULL; |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| unsigned char directlink; |
| uint8_t *packet_pos; |
| |
| packet_pos = forw_packet->skb->data; |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; |
| directlink = (batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0); |
| |
| if (!forw_packet->if_incoming) { |
| pr_err("Error - can't forward packet: incoming iface not specified\n"); |
| goto out; |
| } |
| |
| soft_iface = forw_packet->if_incoming->soft_iface; |
| bat_priv = netdev_priv(soft_iface); |
| |
| if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE) |
| goto out; |
| |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| if (!primary_if) |
| goto out; |
| |
| /* multihomed peer assumed |
| * non-primary OGMs are only broadcasted on their interface |
| */ |
| if ((directlink && (batadv_ogm_packet->header.ttl == 1)) || |
| (forw_packet->own && (forw_packet->if_incoming != primary_if))) { |
| /* FIXME: what about aggregated packets ? */ |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n", |
| (forw_packet->own ? "Sending own" : "Forwarding"), |
| batadv_ogm_packet->orig, |
| ntohl(batadv_ogm_packet->seqno), |
| batadv_ogm_packet->header.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 */ |
| batadv_send_skb_packet(forw_packet->skb, |
| forw_packet->if_incoming, |
| batadv_broadcast_addr); |
| forw_packet->skb = NULL; |
| |
| goto out; |
| } |
| |
| /* broadcast on every interface */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
| if (hard_iface->soft_iface != soft_iface) |
| continue; |
| |
| batadv_iv_ogm_send_to_if(forw_packet, hard_iface); |
| } |
| rcu_read_unlock(); |
| |
| out: |
| if (primary_if) |
| batadv_hardif_free_ref(primary_if); |
| } |
| |
| /* return true if new_packet can be aggregated with forw_packet */ |
| static bool |
| batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet, |
| struct batadv_priv *bat_priv, |
| int packet_len, unsigned long send_time, |
| bool directlink, |
| const struct batadv_hard_iface *if_incoming, |
| const struct batadv_forw_packet *forw_packet) |
| { |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| int aggregated_bytes = forw_packet->packet_len + packet_len; |
| struct batadv_hard_iface *primary_if = NULL; |
| bool res = false; |
| unsigned long aggregation_end_time; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data; |
| aggregation_end_time = send_time; |
| aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
| |
| /* we can aggregate the current packet to this aggregated packet |
| * if: |
| * |
| * - the send time is within our MAX_AGGREGATION_MS time |
| * - the resulting packet wont be bigger than |
| * MAX_AGGREGATION_BYTES |
| */ |
| if (time_before(send_time, forw_packet->send_time) && |
| time_after_eq(aggregation_end_time, forw_packet->send_time) && |
| (aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) { |
| /* check aggregation compatibility |
| * -> direct link packets are broadcasted on |
| * their interface only |
| * -> aggregate packet if the current packet is |
| * a "global" packet as well as the base |
| * packet |
| */ |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| if (!primary_if) |
| goto out; |
| |
| /* packets without direct link flag and high TTL |
| * are flooded through the net |
| */ |
| if ((!directlink) && |
| (!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) && |
| (batadv_ogm_packet->header.ttl != 1) && |
| |
| /* own packets originating non-primary |
| * interfaces leave only that interface |
| */ |
| ((!forw_packet->own) || |
| (forw_packet->if_incoming == primary_if))) { |
| res = true; |
| goto out; |
| } |
| |
| /* if the incoming packet is sent via this one |
| * interface only - we still can aggregate |
| */ |
| if ((directlink) && |
| (new_bat_ogm_packet->header.ttl == 1) && |
| (forw_packet->if_incoming == if_incoming) && |
| |
| /* packets from direct neighbors or |
| * own secondary interface packets |
| * (= secondary interface packets in general) |
| */ |
| (batadv_ogm_packet->flags & BATADV_DIRECTLINK || |
| (forw_packet->own && |
| forw_packet->if_incoming != primary_if))) { |
| res = true; |
| goto out; |
| } |
| } |
| |
| out: |
| if (primary_if) |
| batadv_hardif_free_ref(primary_if); |
| return res; |
| } |
| |
| /* create a new aggregated packet and add this packet to it */ |
| static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff, |
| int packet_len, unsigned long send_time, |
| bool direct_link, |
| struct batadv_hard_iface *if_incoming, |
| int own_packet) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_forw_packet *forw_packet_aggr; |
| unsigned char *skb_buff; |
| unsigned int skb_size; |
| |
| if (!atomic_inc_not_zero(&if_incoming->refcount)) |
| return; |
| |
| /* own packet should always be scheduled */ |
| if (!own_packet) { |
| if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "batman packet queue full\n"); |
| goto out; |
| } |
| } |
| |
| forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC); |
| if (!forw_packet_aggr) { |
| if (!own_packet) |
| atomic_inc(&bat_priv->batman_queue_left); |
| goto out; |
| } |
| |
| if ((atomic_read(&bat_priv->aggregated_ogms)) && |
| (packet_len < BATADV_MAX_AGGREGATION_BYTES)) |
| skb_size = BATADV_MAX_AGGREGATION_BYTES; |
| else |
| skb_size = packet_len; |
| |
| skb_size += ETH_HLEN + NET_IP_ALIGN; |
| |
| forw_packet_aggr->skb = dev_alloc_skb(skb_size); |
| if (!forw_packet_aggr->skb) { |
| if (!own_packet) |
| atomic_inc(&bat_priv->batman_queue_left); |
| kfree(forw_packet_aggr); |
| goto out; |
| } |
| skb_reserve(forw_packet_aggr->skb, ETH_HLEN + NET_IP_ALIGN); |
| |
| INIT_HLIST_NODE(&forw_packet_aggr->list); |
| |
| skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
| forw_packet_aggr->packet_len = packet_len; |
| memcpy(skb_buff, packet_buff, packet_len); |
| |
| forw_packet_aggr->own = own_packet; |
| forw_packet_aggr->if_incoming = if_incoming; |
| forw_packet_aggr->num_packets = 0; |
| forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS; |
| forw_packet_aggr->send_time = send_time; |
| |
| /* save packet direct link flag status */ |
| if (direct_link) |
| forw_packet_aggr->direct_link_flags |= 1; |
| |
| /* add new packet to packet list */ |
| spin_lock_bh(&bat_priv->forw_bat_list_lock); |
| hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list); |
| spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
| |
| /* start timer for this packet */ |
| INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work, |
| batadv_send_outstanding_bat_ogm_packet); |
| queue_delayed_work(batadv_event_workqueue, |
| &forw_packet_aggr->delayed_work, |
| send_time - jiffies); |
| |
| return; |
| out: |
| batadv_hardif_free_ref(if_incoming); |
| } |
| |
| /* aggregate a new packet into the existing ogm packet */ |
| static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr, |
| const unsigned char *packet_buff, |
| int packet_len, bool direct_link) |
| { |
| unsigned char *skb_buff; |
| unsigned long new_direct_link_flag; |
| |
| skb_buff = skb_put(forw_packet_aggr->skb, packet_len); |
| memcpy(skb_buff, packet_buff, packet_len); |
| forw_packet_aggr->packet_len += packet_len; |
| forw_packet_aggr->num_packets++; |
| |
| /* save packet direct link flag status */ |
| if (direct_link) { |
| new_direct_link_flag = BIT(forw_packet_aggr->num_packets); |
| forw_packet_aggr->direct_link_flags |= new_direct_link_flag; |
| } |
| } |
| |
| static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv, |
| unsigned char *packet_buff, |
| int packet_len, |
| struct batadv_hard_iface *if_incoming, |
| int own_packet, unsigned long send_time) |
| { |
| /* _aggr -> pointer to the packet we want to aggregate with |
| * _pos -> pointer to the position in the queue |
| */ |
| struct batadv_forw_packet *forw_packet_aggr = NULL; |
| struct batadv_forw_packet *forw_packet_pos = NULL; |
| struct hlist_node *tmp_node; |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| bool direct_link; |
| unsigned long max_aggregation_jiffies; |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
| direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0; |
| max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS); |
| |
| /* find position for the packet in the forward queue */ |
| spin_lock_bh(&bat_priv->forw_bat_list_lock); |
| /* own packets are not to be aggregated */ |
| if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) { |
| hlist_for_each_entry(forw_packet_pos, tmp_node, |
| &bat_priv->forw_bat_list, list) { |
| if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet, |
| bat_priv, packet_len, |
| send_time, direct_link, |
| if_incoming, |
| forw_packet_pos)) { |
| forw_packet_aggr = forw_packet_pos; |
| break; |
| } |
| } |
| } |
| |
| /* nothing to aggregate with - either aggregation disabled or no |
| * suitable aggregation packet found |
| */ |
| if (!forw_packet_aggr) { |
| /* the following section can run without the lock */ |
| spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
| |
| /* if we could not aggregate this packet with one of the others |
| * we hold it back for a while, so that it might be aggregated |
| * later on |
| */ |
| if (!own_packet && atomic_read(&bat_priv->aggregated_ogms)) |
| send_time += max_aggregation_jiffies; |
| |
| batadv_iv_ogm_aggregate_new(packet_buff, packet_len, |
| send_time, direct_link, |
| if_incoming, own_packet); |
| } else { |
| batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff, |
| packet_len, direct_link); |
| spin_unlock_bh(&bat_priv->forw_bat_list_lock); |
| } |
| } |
| |
| static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node, |
| const struct ethhdr *ethhdr, |
| struct batadv_ogm_packet *batadv_ogm_packet, |
| bool is_single_hop_neigh, |
| bool is_from_best_next_hop, |
| struct batadv_hard_iface *if_incoming) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| uint8_t tt_num_changes; |
| |
| if (batadv_ogm_packet->header.ttl <= 1) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n"); |
| return; |
| } |
| |
| if (!is_from_best_next_hop) { |
| /* Mark the forwarded packet when it is not coming from our |
| * best next hop. We still need to forward the packet for our |
| * neighbor link quality detection to work in case the packet |
| * originated from a single hop neighbor. Otherwise we can |
| * simply drop the ogm. |
| */ |
| if (is_single_hop_neigh) |
| batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP; |
| else |
| return; |
| } |
| |
| tt_num_changes = batadv_ogm_packet->tt_num_changes; |
| |
| batadv_ogm_packet->header.ttl--; |
| memcpy(batadv_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN); |
| |
| /* apply hop penalty */ |
| batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq, |
| bat_priv); |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Forwarding packet: tq: %i, ttl: %i\n", |
| batadv_ogm_packet->tq, batadv_ogm_packet->header.ttl); |
| |
| /* switch of primaries first hop flag when forwarding */ |
| batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP; |
| if (is_single_hop_neigh) |
| batadv_ogm_packet->flags |= BATADV_DIRECTLINK; |
| else |
| batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK; |
| |
| batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet, |
| BATADV_OGM_HLEN + batadv_tt_len(tt_num_changes), |
| if_incoming, 0, batadv_iv_ogm_fwd_send_time()); |
| } |
| |
| static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
| unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff; |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| struct batadv_hard_iface *primary_if; |
| int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len; |
| int vis_server, tt_num_changes = 0; |
| uint32_t seqno; |
| uint8_t bandwidth; |
| |
| vis_server = atomic_read(&bat_priv->vis_mode); |
| primary_if = batadv_primary_if_get_selected(bat_priv); |
| |
| if (hard_iface == primary_if) |
| tt_num_changes = batadv_tt_append_diff(bat_priv, ogm_buff, |
| ogm_buff_len, |
| BATADV_OGM_HLEN); |
| |
| batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff); |
| |
| /* change sequence number to network order */ |
| seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno); |
| batadv_ogm_packet->seqno = htonl(seqno); |
| atomic_inc(&hard_iface->bat_iv.ogm_seqno); |
| |
| batadv_ogm_packet->ttvn = atomic_read(&bat_priv->tt.vn); |
| batadv_ogm_packet->tt_crc = htons(bat_priv->tt.local_crc); |
| if (tt_num_changes >= 0) |
| batadv_ogm_packet->tt_num_changes = tt_num_changes; |
| |
| if (vis_server == BATADV_VIS_TYPE_SERVER_SYNC) |
| batadv_ogm_packet->flags |= BATADV_VIS_SERVER; |
| else |
| batadv_ogm_packet->flags &= ~BATADV_VIS_SERVER; |
| |
| if (hard_iface == primary_if && |
| atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_SERVER) { |
| bandwidth = (uint8_t)atomic_read(&bat_priv->gw_bandwidth); |
| batadv_ogm_packet->gw_flags = bandwidth; |
| } else { |
| batadv_ogm_packet->gw_flags = BATADV_NO_FLAGS; |
| } |
| |
| batadv_slide_own_bcast_window(hard_iface); |
| batadv_iv_ogm_queue_add(bat_priv, hard_iface->bat_iv.ogm_buff, |
| hard_iface->bat_iv.ogm_buff_len, hard_iface, 1, |
| batadv_iv_ogm_emit_send_time(bat_priv)); |
| |
| if (primary_if) |
| batadv_hardif_free_ref(primary_if); |
| } |
| |
| static void |
| batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv, |
| struct batadv_orig_node *orig_node, |
| const struct ethhdr *ethhdr, |
| const struct batadv_ogm_packet *batadv_ogm_packet, |
| struct batadv_hard_iface *if_incoming, |
| const unsigned char *tt_buff, |
| int is_duplicate) |
| { |
| struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; |
| struct batadv_neigh_node *router = NULL; |
| struct batadv_orig_node *orig_node_tmp; |
| struct hlist_node *node; |
| int if_num; |
| uint8_t sum_orig, sum_neigh; |
| uint8_t *neigh_addr; |
| uint8_t tq_avg; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "update_originator(): Searching and updating originator entry of received packet\n"); |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| &orig_node->neigh_list, list) { |
| neigh_addr = tmp_neigh_node->addr; |
| if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
| tmp_neigh_node->if_incoming == if_incoming && |
| atomic_inc_not_zero(&tmp_neigh_node->refcount)) { |
| if (neigh_node) |
| batadv_neigh_node_free_ref(neigh_node); |
| neigh_node = tmp_neigh_node; |
| continue; |
| } |
| |
| if (is_duplicate) |
| continue; |
| |
| spin_lock_bh(&tmp_neigh_node->lq_update_lock); |
| batadv_ring_buffer_set(tmp_neigh_node->tq_recv, |
| &tmp_neigh_node->tq_index, 0); |
| tq_avg = batadv_ring_buffer_avg(tmp_neigh_node->tq_recv); |
| tmp_neigh_node->tq_avg = tq_avg; |
| spin_unlock_bh(&tmp_neigh_node->lq_update_lock); |
| } |
| |
| if (!neigh_node) { |
| struct batadv_orig_node *orig_tmp; |
| |
| orig_tmp = batadv_get_orig_node(bat_priv, ethhdr->h_source); |
| if (!orig_tmp) |
| goto unlock; |
| |
| neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
| ethhdr->h_source, |
| orig_node, orig_tmp, |
| batadv_ogm_packet->seqno); |
| |
| batadv_orig_node_free_ref(orig_tmp); |
| if (!neigh_node) |
| goto unlock; |
| } else |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Updating existing last-hop neighbor of originator\n"); |
| |
| rcu_read_unlock(); |
| |
| orig_node->flags = batadv_ogm_packet->flags; |
| neigh_node->last_seen = jiffies; |
| |
| spin_lock_bh(&neigh_node->lq_update_lock); |
| batadv_ring_buffer_set(neigh_node->tq_recv, |
| &neigh_node->tq_index, |
| batadv_ogm_packet->tq); |
| neigh_node->tq_avg = batadv_ring_buffer_avg(neigh_node->tq_recv); |
| spin_unlock_bh(&neigh_node->lq_update_lock); |
| |
| if (!is_duplicate) { |
| orig_node->last_ttl = batadv_ogm_packet->header.ttl; |
| neigh_node->last_ttl = batadv_ogm_packet->header.ttl; |
| } |
| |
| batadv_bonding_candidate_add(orig_node, neigh_node); |
| |
| /* if this neighbor already is our next hop there is nothing |
| * to change |
| */ |
| router = batadv_orig_node_get_router(orig_node); |
| if (router == neigh_node) |
| goto update_tt; |
| |
| /* if this neighbor does not offer a better TQ we won't consider it */ |
| if (router && (router->tq_avg > neigh_node->tq_avg)) |
| goto update_tt; |
| |
| /* if the TQ is the same and the link not more symmetric we |
| * won't consider it either |
| */ |
| if (router && (neigh_node->tq_avg == router->tq_avg)) { |
| orig_node_tmp = router->orig_node; |
| spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
| if_num = router->if_incoming->if_num; |
| sum_orig = orig_node_tmp->bcast_own_sum[if_num]; |
| spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
| |
| orig_node_tmp = neigh_node->orig_node; |
| spin_lock_bh(&orig_node_tmp->ogm_cnt_lock); |
| if_num = neigh_node->if_incoming->if_num; |
| sum_neigh = orig_node_tmp->bcast_own_sum[if_num]; |
| spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock); |
| |
| if (sum_orig >= sum_neigh) |
| goto update_tt; |
| } |
| |
| batadv_update_route(bat_priv, orig_node, neigh_node); |
| |
| update_tt: |
| /* I have to check for transtable changes only if the OGM has been |
| * sent through a primary interface |
| */ |
| if (((batadv_ogm_packet->orig != ethhdr->h_source) && |
| (batadv_ogm_packet->header.ttl > 2)) || |
| (batadv_ogm_packet->flags & BATADV_PRIMARIES_FIRST_HOP)) |
| batadv_tt_update_orig(bat_priv, orig_node, tt_buff, |
| batadv_ogm_packet->tt_num_changes, |
| batadv_ogm_packet->ttvn, |
| ntohs(batadv_ogm_packet->tt_crc)); |
| |
| if (orig_node->gw_flags != batadv_ogm_packet->gw_flags) |
| batadv_gw_node_update(bat_priv, orig_node, |
| batadv_ogm_packet->gw_flags); |
| |
| orig_node->gw_flags = batadv_ogm_packet->gw_flags; |
| |
| /* restart gateway selection if fast or late switching was enabled */ |
| if ((orig_node->gw_flags) && |
| (atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) && |
| (atomic_read(&bat_priv->gw_sel_class) > 2)) |
| batadv_gw_check_election(bat_priv, orig_node); |
| |
| goto out; |
| |
| unlock: |
| rcu_read_unlock(); |
| out: |
| if (neigh_node) |
| batadv_neigh_node_free_ref(neigh_node); |
| if (router) |
| batadv_neigh_node_free_ref(router); |
| } |
| |
| static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node, |
| struct batadv_orig_node *orig_neigh_node, |
| struct batadv_ogm_packet *batadv_ogm_packet, |
| struct batadv_hard_iface *if_incoming) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node; |
| struct hlist_node *node; |
| uint8_t total_count; |
| uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own; |
| unsigned int neigh_rq_inv_cube, neigh_rq_max_cube; |
| int tq_asym_penalty, inv_asym_penalty, ret = 0; |
| unsigned int combined_tq; |
| |
| /* find corresponding one hop neighbor */ |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| &orig_neigh_node->neigh_list, list) { |
| if (!batadv_compare_eth(tmp_neigh_node->addr, |
| orig_neigh_node->orig)) |
| continue; |
| |
| if (tmp_neigh_node->if_incoming != if_incoming) |
| continue; |
| |
| if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) |
| continue; |
| |
| neigh_node = tmp_neigh_node; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| if (!neigh_node) |
| neigh_node = batadv_iv_ogm_neigh_new(if_incoming, |
| orig_neigh_node->orig, |
| orig_neigh_node, |
| orig_neigh_node, |
| batadv_ogm_packet->seqno); |
| |
| if (!neigh_node) |
| goto out; |
| |
| /* if orig_node is direct neighbor update neigh_node last_seen */ |
| if (orig_node == orig_neigh_node) |
| neigh_node->last_seen = jiffies; |
| |
| orig_node->last_seen = jiffies; |
| |
| /* find packet count of corresponding one hop neighbor */ |
| spin_lock_bh(&orig_node->ogm_cnt_lock); |
| orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num]; |
| neigh_rq_count = neigh_node->real_packet_count; |
| spin_unlock_bh(&orig_node->ogm_cnt_lock); |
| |
| /* pay attention to not get a value bigger than 100 % */ |
| if (orig_eq_count > neigh_rq_count) |
| total_count = neigh_rq_count; |
| else |
| total_count = orig_eq_count; |
| |
| /* if we have too few packets (too less data) we set tq_own to zero |
| * if we receive too few packets it is not considered bidirectional |
| */ |
| if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM || |
| neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM) |
| tq_own = 0; |
| else |
| /* neigh_node->real_packet_count is never zero as we |
| * only purge old information when getting new |
| * information |
| */ |
| tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count; |
| |
| /* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does |
| * affect the nearly-symmetric links only a little, but |
| * punishes asymmetric links more. This will give a value |
| * between 0 and TQ_MAX_VALUE |
| */ |
| neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count; |
| neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv; |
| neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE * |
| BATADV_TQ_LOCAL_WINDOW_SIZE * |
| BATADV_TQ_LOCAL_WINDOW_SIZE; |
| inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube; |
| inv_asym_penalty /= neigh_rq_max_cube; |
| tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty; |
| |
| combined_tq = batadv_ogm_packet->tq * tq_own * tq_asym_penalty; |
| combined_tq /= BATADV_TQ_MAX_VALUE * BATADV_TQ_MAX_VALUE; |
| batadv_ogm_packet->tq = combined_tq; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n", |
| orig_node->orig, orig_neigh_node->orig, total_count, |
| neigh_rq_count, tq_own, |
| tq_asym_penalty, batadv_ogm_packet->tq); |
| |
| /* if link has the minimum required transmission quality |
| * consider it bidirectional |
| */ |
| if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT) |
| ret = 1; |
| |
| out: |
| if (neigh_node) |
| batadv_neigh_node_free_ref(neigh_node); |
| return ret; |
| } |
| |
| /* processes a batman packet for all interfaces, adjusts the sequence number and |
| * finds out whether it is a duplicate. |
| * returns: |
| * 1 the packet is a duplicate |
| * 0 the packet has not yet been received |
| * -1 the packet is old and has been received while the seqno window |
| * was protected. Caller should drop it. |
| */ |
| static int |
| batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, |
| const struct batadv_ogm_packet *batadv_ogm_packet, |
| const struct batadv_hard_iface *if_incoming) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_orig_node *orig_node; |
| struct batadv_neigh_node *tmp_neigh_node; |
| struct hlist_node *node; |
| int is_duplicate = 0; |
| int32_t seq_diff; |
| int need_update = 0; |
| int set_mark, ret = -1; |
| uint32_t seqno = ntohl(batadv_ogm_packet->seqno); |
| uint8_t *neigh_addr; |
| uint8_t packet_count; |
| |
| orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
| if (!orig_node) |
| return 0; |
| |
| spin_lock_bh(&orig_node->ogm_cnt_lock); |
| seq_diff = seqno - orig_node->last_real_seqno; |
| |
| /* signalize caller that the packet is to be dropped. */ |
| if (!hlist_empty(&orig_node->neigh_list) && |
| batadv_window_protected(bat_priv, seq_diff, |
| &orig_node->batman_seqno_reset)) |
| goto out; |
| |
| rcu_read_lock(); |
| hlist_for_each_entry_rcu(tmp_neigh_node, node, |
| &orig_node->neigh_list, list) { |
| is_duplicate |= batadv_test_bit(tmp_neigh_node->real_bits, |
| orig_node->last_real_seqno, |
| seqno); |
| |
| neigh_addr = tmp_neigh_node->addr; |
| if (batadv_compare_eth(neigh_addr, ethhdr->h_source) && |
| tmp_neigh_node->if_incoming == if_incoming) |
| set_mark = 1; |
| else |
| set_mark = 0; |
| |
| /* if the window moved, set the update flag. */ |
| need_update |= batadv_bit_get_packet(bat_priv, |
| tmp_neigh_node->real_bits, |
| seq_diff, set_mark); |
| |
| packet_count = bitmap_weight(tmp_neigh_node->real_bits, |
| BATADV_TQ_LOCAL_WINDOW_SIZE); |
| tmp_neigh_node->real_packet_count = packet_count; |
| } |
| rcu_read_unlock(); |
| |
| if (need_update) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "updating last_seqno: old %u, new %u\n", |
| orig_node->last_real_seqno, seqno); |
| orig_node->last_real_seqno = seqno; |
| } |
| |
| ret = is_duplicate; |
| |
| out: |
| spin_unlock_bh(&orig_node->ogm_cnt_lock); |
| batadv_orig_node_free_ref(orig_node); |
| return ret; |
| } |
| |
| static void batadv_iv_ogm_process(const struct ethhdr *ethhdr, |
| struct batadv_ogm_packet *batadv_ogm_packet, |
| const unsigned char *tt_buff, |
| struct batadv_hard_iface *if_incoming) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_hard_iface *hard_iface; |
| struct batadv_orig_node *orig_neigh_node, *orig_node; |
| struct batadv_neigh_node *router = NULL, *router_router = NULL; |
| struct batadv_neigh_node *orig_neigh_router = NULL; |
| int has_directlink_flag; |
| int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; |
| int is_broadcast = 0, is_bidirect; |
| bool is_single_hop_neigh = false; |
| bool is_from_best_next_hop = false; |
| int is_duplicate, sameseq, simlar_ttl; |
| uint32_t if_incoming_seqno; |
| uint8_t *prev_sender; |
| |
| /* Silently drop when the batman packet is actually not a |
| * correct packet. |
| * |
| * This might happen if a packet is padded (e.g. Ethernet has a |
| * minimum frame length of 64 byte) and the aggregation interprets |
| * it as an additional length. |
| * |
| * TODO: A more sane solution would be to have a bit in the |
| * batadv_ogm_packet to detect whether the packet is the last |
| * packet in an aggregation. Here we expect that the padding |
| * is always zero (or not 0x01) |
| */ |
| if (batadv_ogm_packet->header.packet_type != BATADV_IV_OGM) |
| return; |
| |
| /* could be changed by schedule_own_packet() */ |
| if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno); |
| |
| if (batadv_ogm_packet->flags & BATADV_DIRECTLINK) |
| has_directlink_flag = 1; |
| else |
| has_directlink_flag = 0; |
| |
| if (batadv_compare_eth(ethhdr->h_source, batadv_ogm_packet->orig)) |
| is_single_hop_neigh = true; |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %#.4x, changes %u, td %d, TTL %d, V %d, IDF %d)\n", |
| ethhdr->h_source, if_incoming->net_dev->name, |
| if_incoming->net_dev->dev_addr, batadv_ogm_packet->orig, |
| batadv_ogm_packet->prev_sender, |
| ntohl(batadv_ogm_packet->seqno), batadv_ogm_packet->ttvn, |
| ntohs(batadv_ogm_packet->tt_crc), |
| batadv_ogm_packet->tt_num_changes, batadv_ogm_packet->tq, |
| batadv_ogm_packet->header.ttl, |
| batadv_ogm_packet->header.version, has_directlink_flag); |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
| if (hard_iface->if_status != BATADV_IF_ACTIVE) |
| continue; |
| |
| if (hard_iface->soft_iface != if_incoming->soft_iface) |
| continue; |
| |
| if (batadv_compare_eth(ethhdr->h_source, |
| hard_iface->net_dev->dev_addr)) |
| is_my_addr = 1; |
| |
| if (batadv_compare_eth(batadv_ogm_packet->orig, |
| hard_iface->net_dev->dev_addr)) |
| is_my_orig = 1; |
| |
| if (batadv_compare_eth(batadv_ogm_packet->prev_sender, |
| hard_iface->net_dev->dev_addr)) |
| is_my_oldorig = 1; |
| |
| if (is_broadcast_ether_addr(ethhdr->h_source)) |
| is_broadcast = 1; |
| } |
| rcu_read_unlock(); |
| |
| if (batadv_ogm_packet->header.version != BATADV_COMPAT_VERSION) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: incompatible batman version (%i)\n", |
| batadv_ogm_packet->header.version); |
| return; |
| } |
| |
| if (is_my_addr) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: received my own broadcast (sender: %pM)\n", |
| ethhdr->h_source); |
| return; |
| } |
| |
| if (is_broadcast) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n", |
| ethhdr->h_source); |
| return; |
| } |
| |
| if (is_my_orig) { |
| unsigned long *word; |
| int offset; |
| int32_t bit_pos; |
| int16_t if_num; |
| uint8_t *weight; |
| |
| orig_neigh_node = batadv_get_orig_node(bat_priv, |
| ethhdr->h_source); |
| if (!orig_neigh_node) |
| return; |
| |
| /* neighbor has to indicate direct link and it has to |
| * come via the corresponding interface |
| * save packet seqno for bidirectional check |
| */ |
| if (has_directlink_flag && |
| batadv_compare_eth(if_incoming->net_dev->dev_addr, |
| batadv_ogm_packet->orig)) { |
| if_num = if_incoming->if_num; |
| offset = if_num * BATADV_NUM_WORDS; |
| |
| spin_lock_bh(&orig_neigh_node->ogm_cnt_lock); |
| word = &(orig_neigh_node->bcast_own[offset]); |
| bit_pos = if_incoming_seqno - 2; |
| bit_pos -= ntohl(batadv_ogm_packet->seqno); |
| batadv_set_bit(word, bit_pos); |
| weight = &orig_neigh_node->bcast_own_sum[if_num]; |
| *weight = bitmap_weight(word, |
| BATADV_TQ_LOCAL_WINDOW_SIZE); |
| spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock); |
| } |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: originator packet from myself (via neighbor)\n"); |
| batadv_orig_node_free_ref(orig_neigh_node); |
| return; |
| } |
| |
| if (is_my_oldorig) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: ignoring all rebroadcast echos (sender: %pM)\n", |
| ethhdr->h_source); |
| return; |
| } |
| |
| if (batadv_ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n", |
| ethhdr->h_source); |
| return; |
| } |
| |
| orig_node = batadv_get_orig_node(bat_priv, batadv_ogm_packet->orig); |
| if (!orig_node) |
| return; |
| |
| is_duplicate = batadv_iv_ogm_update_seqnos(ethhdr, batadv_ogm_packet, |
| if_incoming); |
| |
| if (is_duplicate == -1) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: packet within seqno protection time (sender: %pM)\n", |
| ethhdr->h_source); |
| goto out; |
| } |
| |
| if (batadv_ogm_packet->tq == 0) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: originator packet with tq equal 0\n"); |
| goto out; |
| } |
| |
| router = batadv_orig_node_get_router(orig_node); |
| if (router) |
| router_router = batadv_orig_node_get_router(router->orig_node); |
| |
| if ((router && router->tq_avg != 0) && |
| (batadv_compare_eth(router->addr, ethhdr->h_source))) |
| is_from_best_next_hop = true; |
| |
| prev_sender = batadv_ogm_packet->prev_sender; |
| /* avoid temporary routing loops */ |
| if (router && router_router && |
| (batadv_compare_eth(router->addr, prev_sender)) && |
| !(batadv_compare_eth(batadv_ogm_packet->orig, prev_sender)) && |
| (batadv_compare_eth(router->addr, router_router->addr))) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n", |
| ethhdr->h_source); |
| goto out; |
| } |
| |
| /* if sender is a direct neighbor the sender mac equals |
| * originator mac |
| */ |
| if (is_single_hop_neigh) |
| orig_neigh_node = orig_node; |
| else |
| orig_neigh_node = batadv_get_orig_node(bat_priv, |
| ethhdr->h_source); |
| |
| if (!orig_neigh_node) |
| goto out; |
| |
| orig_neigh_router = batadv_orig_node_get_router(orig_neigh_node); |
| |
| /* drop packet if sender is not a direct neighbor and if we |
| * don't route towards it |
| */ |
| if (!is_single_hop_neigh && (!orig_neigh_router)) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: OGM via unknown neighbor!\n"); |
| goto out_neigh; |
| } |
| |
| is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node, |
| batadv_ogm_packet, if_incoming); |
| |
| batadv_bonding_save_primary(orig_node, orig_neigh_node, |
| batadv_ogm_packet); |
| |
| /* update ranking if it is not a duplicate or has the same |
| * seqno and similar ttl as the non-duplicate |
| */ |
| sameseq = orig_node->last_real_seqno == ntohl(batadv_ogm_packet->seqno); |
| simlar_ttl = orig_node->last_ttl - 3 <= batadv_ogm_packet->header.ttl; |
| if (is_bidirect && (!is_duplicate || (sameseq && simlar_ttl))) |
| batadv_iv_ogm_orig_update(bat_priv, orig_node, ethhdr, |
| batadv_ogm_packet, if_incoming, |
| tt_buff, is_duplicate); |
| |
| /* is single hop (direct) neighbor */ |
| if (is_single_hop_neigh) { |
| /* mark direct link on incoming interface */ |
| batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
| is_single_hop_neigh, |
| is_from_best_next_hop, if_incoming); |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Forwarding packet: rebroadcast neighbor packet with direct link flag\n"); |
| goto out_neigh; |
| } |
| |
| /* multihop originator */ |
| if (!is_bidirect) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: not received via bidirectional link\n"); |
| goto out_neigh; |
| } |
| |
| if (is_duplicate) { |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Drop packet: duplicate packet received\n"); |
| goto out_neigh; |
| } |
| |
| batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
| "Forwarding packet: rebroadcast originator packet\n"); |
| batadv_iv_ogm_forward(orig_node, ethhdr, batadv_ogm_packet, |
| is_single_hop_neigh, is_from_best_next_hop, |
| if_incoming); |
| |
| out_neigh: |
| if ((orig_neigh_node) && (!is_single_hop_neigh)) |
| batadv_orig_node_free_ref(orig_neigh_node); |
| out: |
| if (router) |
| batadv_neigh_node_free_ref(router); |
| if (router_router) |
| batadv_neigh_node_free_ref(router_router); |
| if (orig_neigh_router) |
| batadv_neigh_node_free_ref(orig_neigh_router); |
| |
| batadv_orig_node_free_ref(orig_node); |
| } |
| |
| static int batadv_iv_ogm_receive(struct sk_buff *skb, |
| struct batadv_hard_iface *if_incoming) |
| { |
| struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface); |
| struct batadv_ogm_packet *batadv_ogm_packet; |
| struct ethhdr *ethhdr; |
| int buff_pos = 0, packet_len; |
| unsigned char *tt_buff, *packet_buff; |
| bool ret; |
| uint8_t *packet_pos; |
| |
| ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN); |
| if (!ret) |
| return NET_RX_DROP; |
| |
| /* did we receive a B.A.T.M.A.N. IV OGM packet on an interface |
| * that does not have B.A.T.M.A.N. IV enabled ? |
| */ |
| if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit) |
| return NET_RX_DROP; |
| |
| batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX); |
| batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES, |
| skb->len + ETH_HLEN); |
| |
| packet_len = skb_headlen(skb); |
| ethhdr = (struct ethhdr *)skb_mac_header(skb); |
| packet_buff = skb->data; |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff; |
| |
| /* unpack the aggregated packets and process them one by one */ |
| do { |
| tt_buff = packet_buff + buff_pos + BATADV_OGM_HLEN; |
| |
| batadv_iv_ogm_process(ethhdr, batadv_ogm_packet, tt_buff, |
| if_incoming); |
| |
| buff_pos += BATADV_OGM_HLEN; |
| buff_pos += batadv_tt_len(batadv_ogm_packet->tt_num_changes); |
| |
| packet_pos = packet_buff + buff_pos; |
| batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos; |
| } while (batadv_iv_ogm_aggr_packet(buff_pos, packet_len, |
| batadv_ogm_packet->tt_num_changes)); |
| |
| kfree_skb(skb); |
| return NET_RX_SUCCESS; |
| } |
| |
| static struct batadv_algo_ops batadv_batman_iv __read_mostly = { |
| .name = "BATMAN_IV", |
| .bat_iface_enable = batadv_iv_ogm_iface_enable, |
| .bat_iface_disable = batadv_iv_ogm_iface_disable, |
| .bat_iface_update_mac = batadv_iv_ogm_iface_update_mac, |
| .bat_primary_iface_set = batadv_iv_ogm_primary_iface_set, |
| .bat_ogm_schedule = batadv_iv_ogm_schedule, |
| .bat_ogm_emit = batadv_iv_ogm_emit, |
| }; |
| |
| int __init batadv_iv_init(void) |
| { |
| int ret; |
| |
| /* batman originator packet */ |
| ret = batadv_recv_handler_register(BATADV_IV_OGM, |
| batadv_iv_ogm_receive); |
| if (ret < 0) |
| goto out; |
| |
| ret = batadv_algo_register(&batadv_batman_iv); |
| if (ret < 0) |
| goto handler_unregister; |
| |
| goto out; |
| |
| handler_unregister: |
| batadv_recv_handler_unregister(BATADV_IV_OGM); |
| out: |
| return ret; |
| } |