/* * Copyright (C) 2007-2010 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 "routing.h" #include "send.h" #include "hash.h" #include "soft-interface.h" #include "hard-interface.h" #include "icmp_socket.h" #include "translation-table.h" #include "originator.h" #include "types.h" #include "ring_buffer.h" #include "vis.h" #include "aggregation.h" #include "gateway_common.h" #include "gateway_client.h" #include "unicast.h" void slide_own_bcast_window(struct batman_if *batman_if) { struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); struct hashtable_t *hash = bat_priv->orig_hash; struct hlist_node *walk; struct hlist_head *head; struct element_t *bucket; struct orig_node *orig_node; unsigned long *word; int i; size_t word_index; spin_lock_bh(&bat_priv->orig_hash_lock); for (i = 0; i < hash->size; i++) { head = &hash->table[i]; hlist_for_each_entry(bucket, walk, head, hlist) { orig_node = bucket->data; word_index = batman_if->if_num * NUM_WORDS; word = &(orig_node->bcast_own[word_index]); bit_get_packet(bat_priv, word, 1, 0); orig_node->bcast_own_sum[batman_if->if_num] = bit_packet_count(word); } } spin_unlock_bh(&bat_priv->orig_hash_lock); } static void update_HNA(struct bat_priv *bat_priv, struct orig_node *orig_node, unsigned char *hna_buff, int hna_buff_len) { if ((hna_buff_len != orig_node->hna_buff_len) || ((hna_buff_len > 0) && (orig_node->hna_buff_len > 0) && (memcmp(orig_node->hna_buff, hna_buff, hna_buff_len) != 0))) { if (orig_node->hna_buff_len > 0) hna_global_del_orig(bat_priv, orig_node, "originator changed hna"); if ((hna_buff_len > 0) && (hna_buff)) hna_global_add_orig(bat_priv, orig_node, hna_buff, hna_buff_len); } } static void update_route(struct bat_priv *bat_priv, struct orig_node *orig_node, struct neigh_node *neigh_node, unsigned char *hna_buff, int hna_buff_len) { /* route deleted */ if ((orig_node->router) && (!neigh_node)) { bat_dbg(DBG_ROUTES, bat_priv, "Deleting route towards: %pM\n", orig_node->orig); hna_global_del_orig(bat_priv, orig_node, "originator timed out"); /* route added */ } else if ((!orig_node->router) && (neigh_node)) { bat_dbg(DBG_ROUTES, bat_priv, "Adding route towards: %pM (via %pM)\n", orig_node->orig, neigh_node->addr); hna_global_add_orig(bat_priv, orig_node, hna_buff, hna_buff_len); /* route changed */ } else { bat_dbg(DBG_ROUTES, bat_priv, "Changing route towards: %pM " "(now via %pM - was via %pM)\n", orig_node->orig, neigh_node->addr, orig_node->router->addr); } orig_node->router = neigh_node; } void update_routes(struct bat_priv *bat_priv, struct orig_node *orig_node, struct neigh_node *neigh_node, unsigned char *hna_buff, int hna_buff_len) { if (!orig_node) return; if (orig_node->router != neigh_node) update_route(bat_priv, orig_node, neigh_node, hna_buff, hna_buff_len); /* may be just HNA changed */ else update_HNA(bat_priv, orig_node, hna_buff, hna_buff_len); } static int is_bidirectional_neigh(struct orig_node *orig_node, struct orig_node *orig_neigh_node, struct batman_packet *batman_packet, struct batman_if *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; unsigned char total_count; if (orig_node == orig_neigh_node) { list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { if (compare_orig(tmp_neigh_node->addr, orig_neigh_node->orig) && (tmp_neigh_node->if_incoming == if_incoming)) neigh_node = tmp_neigh_node; } if (!neigh_node) neigh_node = create_neighbor(orig_node, orig_neigh_node, orig_neigh_node->orig, if_incoming); /* create_neighbor failed, return 0 */ if (!neigh_node) return 0; neigh_node->last_valid = jiffies; } else { /* find packet count of corresponding one hop neighbor */ list_for_each_entry(tmp_neigh_node, &orig_neigh_node->neigh_list, list) { if (compare_orig(tmp_neigh_node->addr, orig_neigh_node->orig) && (tmp_neigh_node->if_incoming == if_incoming)) neigh_node = tmp_neigh_node; } if (!neigh_node) neigh_node = create_neighbor(orig_neigh_node, orig_neigh_node, orig_neigh_node->orig, if_incoming); /* create_neighbor failed, return 0 */ if (!neigh_node) return 0; } orig_node->last_valid = jiffies; /* pay attention to not get a value bigger than 100 % */ total_count = (orig_neigh_node->bcast_own_sum[if_incoming->if_num] > neigh_node->real_packet_count ? neigh_node->real_packet_count : orig_neigh_node->bcast_own_sum[if_incoming->if_num]); /* 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 < TQ_LOCAL_BIDRECT_SEND_MINIMUM) || (neigh_node->real_packet_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM)) orig_neigh_node->tq_own = 0; else /* neigh_node->real_packet_count is never zero as we * only purge old information when getting new * information */ orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) / neigh_node->real_packet_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 */ orig_neigh_node->tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) / (TQ_LOCAL_WINDOW_SIZE * TQ_LOCAL_WINDOW_SIZE * TQ_LOCAL_WINDOW_SIZE); batman_packet->tq = ((batman_packet->tq * orig_neigh_node->tq_own * orig_neigh_node->tq_asym_penalty) / (TQ_MAX_VALUE * TQ_MAX_VALUE)); bat_dbg(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_node->real_packet_count, orig_neigh_node->tq_own, orig_neigh_node->tq_asym_penalty, batman_packet->tq); /* if link has the minimum required transmission quality * consider it bidirectional */ if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT) return 1; return 0; } static void update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node, struct ethhdr *ethhdr, struct batman_packet *batman_packet, struct batman_if *if_incoming, unsigned char *hna_buff, int hna_buff_len, char is_duplicate) { struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; int tmp_hna_buff_len; bat_dbg(DBG_BATMAN, bat_priv, "update_originator(): " "Searching and updating originator entry of received packet\n"); list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && (tmp_neigh_node->if_incoming == if_incoming)) { neigh_node = tmp_neigh_node; continue; } if (is_duplicate) continue; ring_buffer_set(tmp_neigh_node->tq_recv, &tmp_neigh_node->tq_index, 0); tmp_neigh_node->tq_avg = ring_buffer_avg(tmp_neigh_node->tq_recv); } if (!neigh_node) { struct orig_node *orig_tmp; orig_tmp = get_orig_node(bat_priv, ethhdr->h_source); if (!orig_tmp) return; neigh_node = create_neighbor(orig_node, orig_tmp, ethhdr->h_source, if_incoming); if (!neigh_node) return; } else bat_dbg(DBG_BATMAN, bat_priv, "Updating existing last-hop neighbor of originator\n"); orig_node->flags = batman_packet->flags; neigh_node->last_valid = jiffies; ring_buffer_set(neigh_node->tq_recv, &neigh_node->tq_index, batman_packet->tq); neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv); if (!is_duplicate) { orig_node->last_ttl = batman_packet->ttl; neigh_node->last_ttl = batman_packet->ttl; } tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? batman_packet->num_hna * ETH_ALEN : hna_buff_len); /* if this neighbor already is our next hop there is nothing * to change */ if (orig_node->router == neigh_node) goto update_hna; /* if this neighbor does not offer a better TQ we won't consider it */ if ((orig_node->router) && (orig_node->router->tq_avg > neigh_node->tq_avg)) goto update_hna; /* if the TQ is the same and the link not more symetric we * won't consider it either */ if ((orig_node->router) && ((neigh_node->tq_avg == orig_node->router->tq_avg) && (orig_node->router->orig_node->bcast_own_sum[if_incoming->if_num] >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num]))) goto update_hna; update_routes(bat_priv, orig_node, neigh_node, hna_buff, tmp_hna_buff_len); goto update_gw; update_hna: update_routes(bat_priv, orig_node, orig_node->router, hna_buff, tmp_hna_buff_len); update_gw: if (orig_node->gw_flags != batman_packet->gw_flags) gw_node_update(bat_priv, orig_node, batman_packet->gw_flags); orig_node->gw_flags = batman_packet->gw_flags; /* restart gateway selection if fast or late switching was enabled */ if ((orig_node->gw_flags) && (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) && (atomic_read(&bat_priv->gw_sel_class) > 2)) gw_check_election(bat_priv, orig_node); } /* checks whether the host restarted and is in the protection time. * returns: * 0 if the packet is to be accepted * 1 if the packet is to be ignored. */ static int window_protected(struct bat_priv *bat_priv, int32_t seq_num_diff, unsigned long *last_reset) { if ((seq_num_diff <= -TQ_LOCAL_WINDOW_SIZE) || (seq_num_diff >= EXPECTED_SEQNO_RANGE)) { if (time_after(jiffies, *last_reset + msecs_to_jiffies(RESET_PROTECTION_MS))) { *last_reset = jiffies; bat_dbg(DBG_BATMAN, bat_priv, "old packet received, start protection\n"); return 0; } else return 1; } return 0; } /* 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 char count_real_packets(struct ethhdr *ethhdr, struct batman_packet *batman_packet, struct batman_if *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); struct orig_node *orig_node; struct neigh_node *tmp_neigh_node; char is_duplicate = 0; int32_t seq_diff; int need_update = 0; int set_mark; orig_node = get_orig_node(bat_priv, batman_packet->orig); if (!orig_node) return 0; seq_diff = batman_packet->seqno - orig_node->last_real_seqno; /* signalize caller that the packet is to be dropped. */ if (window_protected(bat_priv, seq_diff, &orig_node->batman_seqno_reset)) return -1; list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { is_duplicate |= get_bit_status(tmp_neigh_node->real_bits, orig_node->last_real_seqno, batman_packet->seqno); if (compare_orig(tmp_neigh_node->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 |= bit_get_packet(bat_priv, tmp_neigh_node->real_bits, seq_diff, set_mark); tmp_neigh_node->real_packet_count = bit_packet_count(tmp_neigh_node->real_bits); } if (need_update) { bat_dbg(DBG_BATMAN, bat_priv, "updating last_seqno: old %d, new %d\n", orig_node->last_real_seqno, batman_packet->seqno); orig_node->last_real_seqno = batman_packet->seqno; } return is_duplicate; } /* copy primary address for bonding */ static void mark_bonding_address(struct orig_node *orig_node, struct orig_node *orig_neigh_node, struct batman_packet *batman_packet) { if (batman_packet->flags & PRIMARIES_FIRST_HOP) memcpy(orig_neigh_node->primary_addr, orig_node->orig, ETH_ALEN); return; } /* mark possible bond.candidates in the neighbor list */ void update_bonding_candidates(struct orig_node *orig_node) { int candidates; int interference_candidate; int best_tq; struct neigh_node *tmp_neigh_node, *tmp_neigh_node2; struct neigh_node *first_candidate, *last_candidate; /* update the candidates for this originator */ if (!orig_node->router) { orig_node->bond.candidates = 0; return; } best_tq = orig_node->router->tq_avg; /* update bond.candidates */ candidates = 0; /* mark other nodes which also received "PRIMARIES FIRST HOP" packets * as "bonding partner" */ /* first, zero the list */ list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { tmp_neigh_node->next_bond_candidate = NULL; } first_candidate = NULL; last_candidate = NULL; list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { /* only consider if it has the same primary address ... */ if (memcmp(orig_node->orig, tmp_neigh_node->orig_node->primary_addr, ETH_ALEN) != 0) continue; /* ... and is good enough to be considered */ if (tmp_neigh_node->tq_avg < best_tq - BONDING_TQ_THRESHOLD) continue; /* check if we have another candidate with the same * mac address or interface. If we do, we won't * select this candidate because of possible interference. */ interference_candidate = 0; list_for_each_entry(tmp_neigh_node2, &orig_node->neigh_list, list) { if (tmp_neigh_node2 == tmp_neigh_node) continue; /* we only care if the other candidate is even * considered as candidate. */ if (!tmp_neigh_node2->next_bond_candidate) continue; if ((tmp_neigh_node->if_incoming == tmp_neigh_node2->if_incoming) || (memcmp(tmp_neigh_node->addr, tmp_neigh_node2->addr, ETH_ALEN) == 0)) { interference_candidate = 1; break; } } /* don't care further if it is an interference candidate */ if (interference_candidate) continue; if (!first_candidate) { first_candidate = tmp_neigh_node; tmp_neigh_node->next_bond_candidate = first_candidate; } else tmp_neigh_node->next_bond_candidate = last_candidate; last_candidate = tmp_neigh_node; candidates++; } if (candidates > 0) { first_candidate->next_bond_candidate = last_candidate; orig_node->bond.selected = first_candidate; } orig_node->bond.candidates = candidates; } void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_packet, unsigned char *hna_buff, int hna_buff_len, struct batman_if *if_incoming) { struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface); struct batman_if *batman_if; struct orig_node *orig_neigh_node, *orig_node; char has_directlink_flag; char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0; char is_broadcast = 0, is_bidirectional, is_single_hop_neigh; char is_duplicate; uint32_t if_incoming_seqno; /* 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 * batman_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 (batman_packet->packet_type != BAT_PACKET) return; /* could be changed by schedule_own_packet() */ if_incoming_seqno = atomic_read(&if_incoming->seqno); has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); is_single_hop_neigh = (compare_orig(ethhdr->h_source, batman_packet->orig) ? 1 : 0); bat_dbg(DBG_BATMAN, bat_priv, "Received BATMAN packet via NB: %pM, IF: %s [%pM] " "(from OG: %pM, via prev OG: %pM, seqno %d, tq %d, " "TTL %d, V %d, IDF %d)\n", ethhdr->h_source, if_incoming->net_dev->name, if_incoming->net_dev->dev_addr, batman_packet->orig, batman_packet->prev_sender, batman_packet->seqno, batman_packet->tq, batman_packet->ttl, batman_packet->version, has_directlink_flag); rcu_read_lock(); list_for_each_entry_rcu(batman_if, &if_list, list) { if (batman_if->if_status != IF_ACTIVE) continue; if (batman_if->soft_iface != if_incoming->soft_iface) continue; if (compare_orig(ethhdr->h_source, batman_if->net_dev->dev_addr)) is_my_addr = 1; if (compare_orig(batman_packet->orig, batman_if->net_dev->dev_addr)) is_my_orig = 1; if (compare_orig(batman_packet->prev_sender, batman_if->net_dev->dev_addr)) is_my_oldorig = 1; if (compare_orig(ethhdr->h_source, broadcast_addr)) is_broadcast = 1; } rcu_read_unlock(); if (batman_packet->version != COMPAT_VERSION) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: incompatible batman version (%i)\n", batman_packet->version); return; } if (is_my_addr) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: received my own broadcast (sender: %pM" ")\n", ethhdr->h_source); return; } if (is_broadcast) { bat_dbg(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; orig_neigh_node = 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 */ /* if received seqno equals last send seqno save new * seqno for bidirectional check */ if (has_directlink_flag && compare_orig(if_incoming->net_dev->dev_addr, batman_packet->orig) && (batman_packet->seqno - if_incoming_seqno + 2 == 0)) { offset = if_incoming->if_num * NUM_WORDS; word = &(orig_neigh_node->bcast_own[offset]); bit_mark(word, 0); orig_neigh_node->bcast_own_sum[if_incoming->if_num] = bit_packet_count(word); } bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: " "originator packet from myself (via neighbor)\n"); return; } if (is_my_oldorig) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: ignoring all rebroadcast echos (sender: " "%pM)\n", ethhdr->h_source); return; } orig_node = get_orig_node(bat_priv, batman_packet->orig); if (!orig_node) return; is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); if (is_duplicate == -1) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: packet within seqno protection time " "(sender: %pM)\n", ethhdr->h_source); return; } if (batman_packet->tq == 0) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: originator packet with tq equal 0\n"); return; } /* avoid temporary routing loops */ if ((orig_node->router) && (orig_node->router->orig_node->router) && (compare_orig(orig_node->router->addr, batman_packet->prev_sender)) && !(compare_orig(batman_packet->orig, batman_packet->prev_sender)) && (compare_orig(orig_node->router->addr, orig_node->router->orig_node->router->addr))) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: ignoring all rebroadcast packets that " "may make me loop (sender: %pM)\n", ethhdr->h_source); return; } /* if sender is a direct neighbor the sender mac equals * originator mac */ orig_neigh_node = (is_single_hop_neigh ? orig_node : get_orig_node(bat_priv, ethhdr->h_source)); if (!orig_neigh_node) return; /* drop packet if sender is not a direct neighbor and if we * don't route towards it */ if (!is_single_hop_neigh && (!orig_neigh_node->router)) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: OGM via unknown neighbor!\n"); return; } is_bidirectional = is_bidirectional_neigh(orig_node, orig_neigh_node, batman_packet, if_incoming); /* update ranking if it is not a duplicate or has the same * seqno and similar ttl as the non-duplicate */ if (is_bidirectional && (!is_duplicate || ((orig_node->last_real_seqno == batman_packet->seqno) && (orig_node->last_ttl - 3 <= batman_packet->ttl)))) update_orig(bat_priv, orig_node, ethhdr, batman_packet, if_incoming, hna_buff, hna_buff_len, is_duplicate); mark_bonding_address(orig_node, orig_neigh_node, batman_packet); update_bonding_candidates(orig_node); /* is single hop (direct) neighbor */ if (is_single_hop_neigh) { /* mark direct link on incoming interface */ schedule_forward_packet(orig_node, ethhdr, batman_packet, 1, hna_buff_len, if_incoming); bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: " "rebroadcast neighbor packet with direct link flag\n"); return; } /* multihop originator */ if (!is_bidirectional) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: not received via bidirectional link\n"); return; } if (is_duplicate) { bat_dbg(DBG_BATMAN, bat_priv, "Drop packet: duplicate packet received\n"); return; } bat_dbg(DBG_BATMAN, bat_priv, "Forwarding packet: rebroadcast originator packet\n"); schedule_forward_packet(orig_node, ethhdr, batman_packet, 0, hna_buff_len, if_incoming); } int recv_bat_packet(struct sk_buff *skb, struct batman_if *batman_if) { struct bat_priv *bat_priv = netdev_priv(batman_if->soft_iface); struct ethhdr *ethhdr; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, sizeof(struct batman_packet)))) return NET_RX_DROP; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* packet with broadcast indication but unicast recipient */ if (!is_broadcast_ether_addr(ethhdr->h_dest)) return NET_RX_DROP; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) return NET_RX_DROP; /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, 0) < 0) return NET_RX_DROP; /* keep skb linear */ if (skb_linearize(skb) < 0) return NET_RX_DROP; ethhdr = (struct ethhdr *)skb_mac_header(skb); spin_lock_bh(&bat_priv->orig_hash_lock); receive_aggr_bat_packet(ethhdr, skb->data, skb_headlen(skb), batman_if); spin_unlock_bh(&bat_priv->orig_hash_lock); kfree_skb(skb); return NET_RX_SUCCESS; } static int recv_my_icmp_packet(struct bat_priv *bat_priv, struct sk_buff *skb, size_t icmp_len) { struct orig_node *orig_node; struct icmp_packet_rr *icmp_packet; struct ethhdr *ethhdr; struct batman_if *batman_if; int ret; uint8_t dstaddr[ETH_ALEN]; icmp_packet = (struct icmp_packet_rr *)skb->data; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* add data to device queue */ if (icmp_packet->msg_type != ECHO_REQUEST) { bat_socket_receive_packet(icmp_packet, icmp_len); return NET_RX_DROP; } if (!bat_priv->primary_if) return NET_RX_DROP; /* answer echo request (ping) */ /* get routing information */ spin_lock_bh(&bat_priv->orig_hash_lock); orig_node = ((struct orig_node *)hash_find(bat_priv->orig_hash, compare_orig, choose_orig, icmp_packet->orig)); ret = NET_RX_DROP; if ((orig_node) && (orig_node->router)) { /* don't lock while sending the packets ... we therefore * copy the required data before sending */ batman_if = orig_node->router->if_incoming; memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); spin_unlock_bh(&bat_priv->orig_hash_lock); /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, sizeof(struct ethhdr)) < 0) return NET_RX_DROP; icmp_packet = (struct icmp_packet_rr *)skb->data; ethhdr = (struct ethhdr *)skb_mac_header(skb); memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); memcpy(icmp_packet->orig, bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); icmp_packet->msg_type = ECHO_REPLY; icmp_packet->ttl = TTL; send_skb_packet(skb, batman_if, dstaddr); ret = NET_RX_SUCCESS; } else spin_unlock_bh(&bat_priv->orig_hash_lock); return ret; } static int recv_icmp_ttl_exceeded(struct bat_priv *bat_priv, struct sk_buff *skb) { struct orig_node *orig_node; struct icmp_packet *icmp_packet; struct ethhdr *ethhdr; struct batman_if *batman_if; int ret; uint8_t dstaddr[ETH_ALEN]; icmp_packet = (struct icmp_packet *)skb->data; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* send TTL exceeded if packet is an echo request (traceroute) */ if (icmp_packet->msg_type != ECHO_REQUEST) { pr_debug("Warning - can't forward icmp packet from %pM to " "%pM: ttl exceeded\n", icmp_packet->orig, icmp_packet->dst); return NET_RX_DROP; } if (!bat_priv->primary_if) return NET_RX_DROP; /* get routing information */ spin_lock_bh(&bat_priv->orig_hash_lock); orig_node = ((struct orig_node *) hash_find(bat_priv->orig_hash, compare_orig, choose_orig, icmp_packet->orig)); ret = NET_RX_DROP; if ((orig_node) && (orig_node->router)) { /* don't lock while sending the packets ... we therefore * copy the required data before sending */ batman_if = orig_node->router->if_incoming; memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); spin_unlock_bh(&bat_priv->orig_hash_lock); /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, sizeof(struct ethhdr)) < 0) return NET_RX_DROP; icmp_packet = (struct icmp_packet *) skb->data; ethhdr = (struct ethhdr *)skb_mac_header(skb); memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); memcpy(icmp_packet->orig, bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN); icmp_packet->msg_type = TTL_EXCEEDED; icmp_packet->ttl = TTL; send_skb_packet(skb, batman_if, dstaddr); ret = NET_RX_SUCCESS; } else spin_unlock_bh(&bat_priv->orig_hash_lock); return ret; } int recv_icmp_packet(struct sk_buff *skb, struct batman_if *recv_if) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct icmp_packet_rr *icmp_packet; struct ethhdr *ethhdr; struct orig_node *orig_node; struct batman_if *batman_if; int hdr_size = sizeof(struct icmp_packet); int ret; uint8_t dstaddr[ETH_ALEN]; /** * we truncate all incoming icmp packets if they don't match our size */ if (skb->len >= sizeof(struct icmp_packet_rr)) hdr_size = sizeof(struct icmp_packet_rr); /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) return NET_RX_DROP; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) return NET_RX_DROP; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) return NET_RX_DROP; /* not for me */ if (!is_my_mac(ethhdr->h_dest)) return NET_RX_DROP; icmp_packet = (struct icmp_packet_rr *)skb->data; /* add record route information if not full */ if ((hdr_size == sizeof(struct icmp_packet_rr)) && (icmp_packet->rr_cur < BAT_RR_LEN)) { memcpy(&(icmp_packet->rr[icmp_packet->rr_cur]), ethhdr->h_dest, ETH_ALEN); icmp_packet->rr_cur++; } /* packet for me */ if (is_my_mac(icmp_packet->dst)) return recv_my_icmp_packet(bat_priv, skb, hdr_size); /* TTL exceeded */ if (icmp_packet->ttl < 2) return recv_icmp_ttl_exceeded(bat_priv, skb); ret = NET_RX_DROP; /* get routing information */ spin_lock_bh(&bat_priv->orig_hash_lock); orig_node = ((struct orig_node *) hash_find(bat_priv->orig_hash, compare_orig, choose_orig, icmp_packet->dst)); if ((orig_node) && (orig_node->router)) { /* don't lock while sending the packets ... we therefore * copy the required data before sending */ batman_if = orig_node->router->if_incoming; memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); spin_unlock_bh(&bat_priv->orig_hash_lock); /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, sizeof(struct ethhdr)) < 0) return NET_RX_DROP; icmp_packet = (struct icmp_packet_rr *)skb->data; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* decrement ttl */ icmp_packet->ttl--; /* route it */ send_skb_packet(skb, batman_if, dstaddr); ret = NET_RX_SUCCESS; } else spin_unlock_bh(&bat_priv->orig_hash_lock); return ret; } /* find a suitable router for this originator, and use * bonding if possible. */ struct neigh_node *find_router(struct bat_priv *bat_priv, struct orig_node *orig_node, struct batman_if *recv_if) { struct orig_node *primary_orig_node; struct orig_node *router_orig; struct neigh_node *router, *first_candidate, *best_router; static uint8_t zero_mac[ETH_ALEN] = {0, 0, 0, 0, 0, 0}; int bonding_enabled; if (!orig_node) return NULL; if (!orig_node->router) return NULL; /* without bonding, the first node should * always choose the default router. */ bonding_enabled = atomic_read(&bat_priv->bonding); if ((!recv_if) && (!bonding_enabled)) return orig_node->router; router_orig = orig_node->router->orig_node; /* if we have something in the primary_addr, we can search * for a potential bonding candidate. */ if (memcmp(router_orig->primary_addr, zero_mac, ETH_ALEN) == 0) return orig_node->router; /* find the orig_node which has the primary interface. might * even be the same as our router_orig in many cases */ if (memcmp(router_orig->primary_addr, router_orig->orig, ETH_ALEN) == 0) { primary_orig_node = router_orig; } else { primary_orig_node = hash_find(bat_priv->orig_hash, compare_orig, choose_orig, router_orig->primary_addr); if (!primary_orig_node) return orig_node->router; } /* with less than 2 candidates, we can't do any * bonding and prefer the original router. */ if (primary_orig_node->bond.candidates < 2) return orig_node->router; /* all nodes between should choose a candidate which * is is not on the interface where the packet came * in. */ first_candidate = primary_orig_node->bond.selected; router = first_candidate; if (bonding_enabled) { /* in the bonding case, send the packets in a round * robin fashion over the remaining interfaces. */ do { /* recv_if == NULL on the first node. */ if (router->if_incoming != recv_if) break; router = router->next_bond_candidate; } while (router != first_candidate); primary_orig_node->bond.selected = router->next_bond_candidate; } else { /* if bonding is disabled, use the best of the * remaining candidates which are not using * this interface. */ best_router = first_candidate; do { /* recv_if == NULL on the first node. */ if ((router->if_incoming != recv_if) && (router->tq_avg > best_router->tq_avg)) best_router = router; router = router->next_bond_candidate; } while (router != first_candidate); router = best_router; } return router; } static int check_unicast_packet(struct sk_buff *skb, int hdr_size) { struct ethhdr *ethhdr; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) return -1; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* packet with unicast indication but broadcast recipient */ if (is_broadcast_ether_addr(ethhdr->h_dest)) return -1; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) return -1; /* not for me */ if (!is_my_mac(ethhdr->h_dest)) return -1; return 0; } int route_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if, int hdr_size) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct orig_node *orig_node; struct neigh_node *router; struct batman_if *batman_if; uint8_t dstaddr[ETH_ALEN]; struct unicast_packet *unicast_packet; struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); int ret; struct sk_buff *new_skb; unicast_packet = (struct unicast_packet *)skb->data; /* TTL exceeded */ if (unicast_packet->ttl < 2) { pr_debug("Warning - can't forward unicast packet from %pM to " "%pM: ttl exceeded\n", ethhdr->h_source, unicast_packet->dest); return NET_RX_DROP; } /* get routing information */ spin_lock_bh(&bat_priv->orig_hash_lock); orig_node = ((struct orig_node *) hash_find(bat_priv->orig_hash, compare_orig, choose_orig, unicast_packet->dest)); router = find_router(bat_priv, orig_node, recv_if); if (!router) { spin_unlock_bh(&bat_priv->orig_hash_lock); return NET_RX_DROP; } /* don't lock while sending the packets ... we therefore * copy the required data before sending */ batman_if = router->if_incoming; memcpy(dstaddr, router->addr, ETH_ALEN); spin_unlock_bh(&bat_priv->orig_hash_lock); /* create a copy of the skb, if needed, to modify it. */ if (skb_cow(skb, sizeof(struct ethhdr)) < 0) return NET_RX_DROP; unicast_packet = (struct unicast_packet *)skb->data; if (unicast_packet->packet_type == BAT_UNICAST && atomic_read(&bat_priv->fragmentation) && skb->len > batman_if->net_dev->mtu) return frag_send_skb(skb, bat_priv, batman_if, dstaddr); if (unicast_packet->packet_type == BAT_UNICAST_FRAG && frag_can_reassemble(skb, batman_if->net_dev->mtu)) { ret = frag_reassemble_skb(skb, bat_priv, &new_skb); if (ret == NET_RX_DROP) return NET_RX_DROP; /* packet was buffered for late merge */ if (!new_skb) return NET_RX_SUCCESS; skb = new_skb; unicast_packet = (struct unicast_packet *)skb->data; } /* decrement ttl */ unicast_packet->ttl--; /* route it */ send_skb_packet(skb, batman_if, dstaddr); return NET_RX_SUCCESS; } int recv_unicast_packet(struct sk_buff *skb, struct batman_if *recv_if) { struct unicast_packet *unicast_packet; int hdr_size = sizeof(struct unicast_packet); if (check_unicast_packet(skb, hdr_size) < 0) return NET_RX_DROP; unicast_packet = (struct unicast_packet *)skb->data; /* packet for me */ if (is_my_mac(unicast_packet->dest)) { interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); return NET_RX_SUCCESS; } return route_unicast_packet(skb, recv_if, hdr_size); } int recv_ucast_frag_packet(struct sk_buff *skb, struct batman_if *recv_if) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct unicast_frag_packet *unicast_packet; int hdr_size = sizeof(struct unicast_frag_packet); struct sk_buff *new_skb = NULL; int ret; if (check_unicast_packet(skb, hdr_size) < 0) return NET_RX_DROP; unicast_packet = (struct unicast_frag_packet *)skb->data; /* packet for me */ if (is_my_mac(unicast_packet->dest)) { ret = frag_reassemble_skb(skb, bat_priv, &new_skb); if (ret == NET_RX_DROP) return NET_RX_DROP; /* packet was buffered for late merge */ if (!new_skb) return NET_RX_SUCCESS; interface_rx(recv_if->soft_iface, new_skb, recv_if, sizeof(struct unicast_packet)); return NET_RX_SUCCESS; } return route_unicast_packet(skb, recv_if, hdr_size); } int recv_bcast_packet(struct sk_buff *skb, struct batman_if *recv_if) { struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); struct orig_node *orig_node; struct bcast_packet *bcast_packet; struct ethhdr *ethhdr; int hdr_size = sizeof(struct bcast_packet); int32_t seq_diff; /* drop packet if it has not necessary minimum size */ if (unlikely(!pskb_may_pull(skb, hdr_size))) return NET_RX_DROP; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* packet with broadcast indication but unicast recipient */ if (!is_broadcast_ether_addr(ethhdr->h_dest)) return NET_RX_DROP; /* packet with broadcast sender address */ if (is_broadcast_ether_addr(ethhdr->h_source)) return NET_RX_DROP; /* ignore broadcasts sent by myself */ if (is_my_mac(ethhdr->h_source)) return NET_RX_DROP; bcast_packet = (struct bcast_packet *)skb->data; /* ignore broadcasts originated by myself */ if (is_my_mac(bcast_packet->orig)) return NET_RX_DROP; if (bcast_packet->ttl < 2) return NET_RX_DROP; spin_lock_bh(&bat_priv->orig_hash_lock); orig_node = ((struct orig_node *) hash_find(bat_priv->orig_hash, compare_orig, choose_orig, bcast_packet->orig)); if (!orig_node) { spin_unlock_bh(&bat_priv->orig_hash_lock); return NET_RX_DROP; } /* check whether the packet is a duplicate */ if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, ntohl(bcast_packet->seqno))) { spin_unlock_bh(&bat_priv->orig_hash_lock); return NET_RX_DROP; } seq_diff = ntohl(bcast_packet->seqno) - orig_node->last_bcast_seqno; /* check whether the packet is old and the host just restarted. */ if (window_protected(bat_priv, seq_diff, &orig_node->bcast_seqno_reset)) { spin_unlock_bh(&bat_priv->orig_hash_lock); return NET_RX_DROP; } /* mark broadcast in flood history, update window position * if required. */ if (bit_get_packet(bat_priv, orig_node->bcast_bits, seq_diff, 1)) orig_node->last_bcast_seqno = ntohl(bcast_packet->seqno); spin_unlock_bh(&bat_priv->orig_hash_lock); /* rebroadcast packet */ add_bcast_packet_to_list(bat_priv, skb); /* broadcast for me */ interface_rx(recv_if->soft_iface, skb, recv_if, hdr_size); return NET_RX_SUCCESS; } int recv_vis_packet(struct sk_buff *skb, struct batman_if *recv_if) { struct vis_packet *vis_packet; struct ethhdr *ethhdr; struct bat_priv *bat_priv = netdev_priv(recv_if->soft_iface); int hdr_size = sizeof(struct vis_packet); /* keep skb linear */ if (skb_linearize(skb) < 0) return NET_RX_DROP; if (unlikely(!pskb_may_pull(skb, hdr_size))) return NET_RX_DROP; vis_packet = (struct vis_packet *)skb->data; ethhdr = (struct ethhdr *)skb_mac_header(skb); /* not for me */ if (!is_my_mac(ethhdr->h_dest)) return NET_RX_DROP; /* ignore own packets */ if (is_my_mac(vis_packet->vis_orig)) return NET_RX_DROP; if (is_my_mac(vis_packet->sender_orig)) return NET_RX_DROP; switch (vis_packet->vis_type) { case VIS_TYPE_SERVER_SYNC: receive_server_sync_packet(bat_priv, vis_packet, skb_headlen(skb)); break; case VIS_TYPE_CLIENT_UPDATE: receive_client_update_packet(bat_priv, vis_packet, skb_headlen(skb)); break; default: /* ignore unknown packet */ break; } /* We take a copy of the data in the packet, so we should always free the skbuf. */ return NET_RX_DROP; }