diff options
Diffstat (limited to 'drivers/staging/batman-adv/routing.c')
| -rw-r--r-- | drivers/staging/batman-adv/routing.c | 1010 |
1 files changed, 1010 insertions, 0 deletions
diff --git a/drivers/staging/batman-adv/routing.c b/drivers/staging/batman-adv/routing.c new file mode 100644 index 000000000000..4a14c363ac2b --- /dev/null +++ b/drivers/staging/batman-adv/routing.c @@ -0,0 +1,1010 @@ +/* + * Copyright (C) 2007-2009 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 "log.h" +#include "send.h" +#include "soft-interface.h" +#include "hard-interface.h" +#include "device.h" +#include "translation-table.h" +#include "types.h" +#include "hash.h" +#include "ring_buffer.h" +#include "vis.h" +#include "aggregation.h" +#include "compat.h" + + + +DECLARE_WAIT_QUEUE_HEAD(thread_wait); +static DECLARE_DELAYED_WORK(purge_orig_wq, purge_orig); + +static atomic_t data_ready_cond; +atomic_t exit_cond; + +static void start_purge_timer(void) +{ + queue_delayed_work(bat_event_workqueue, &purge_orig_wq, 1 * HZ); +} + +int originator_init(void) +{ + if (orig_hash) + return 1; + + spin_lock(&orig_hash_lock); + orig_hash = hash_new(128, compare_orig, choose_orig); + + if (!orig_hash) + goto err; + + spin_unlock(&orig_hash_lock); + start_purge_timer(); + return 1; + +err: + spin_unlock(&orig_hash_lock); + return 0; +} + +void originator_free(void) +{ + if (!orig_hash) + return; + + cancel_delayed_work_sync(&purge_orig_wq); + + spin_lock(&orig_hash_lock); + hash_delete(orig_hash, free_orig_node); + orig_hash = NULL; + spin_unlock(&orig_hash_lock); +} + +static struct neigh_node *create_neighbor(struct orig_node *orig_node, struct orig_node *orig_neigh_node, uint8_t *neigh, struct batman_if *if_incoming) +{ + struct neigh_node *neigh_node; + + debug_log(LOG_TYPE_BATMAN, "Creating new last-hop neighbour of originator\n"); + + neigh_node = kmalloc(sizeof(struct neigh_node), GFP_ATOMIC); + memset(neigh_node, 0, sizeof(struct neigh_node)); + INIT_LIST_HEAD(&neigh_node->list); + + memcpy(neigh_node->addr, neigh, ETH_ALEN); + neigh_node->orig_node = orig_neigh_node; + neigh_node->if_incoming = if_incoming; + + list_add_tail(&neigh_node->list, &orig_node->neigh_list); + return neigh_node; +} + +void free_orig_node(void *data) +{ + struct list_head *list_pos, *list_pos_tmp; + struct neigh_node *neigh_node; + struct orig_node *orig_node = (struct orig_node *)data; + + /* for all neighbours towards this originator ... */ + list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) { + neigh_node = list_entry(list_pos, struct neigh_node, list); + + list_del(list_pos); + kfree(neigh_node); + } + + hna_global_del_orig(orig_node, "originator timed out"); + + kfree(orig_node->bcast_own); + kfree(orig_node->bcast_own_sum); + kfree(orig_node); +} + +/* this function finds or creates an originator entry for the given address if it does not exits */ +static struct orig_node *get_orig_node(uint8_t *addr) +{ + struct orig_node *orig_node; + struct hashtable_t *swaphash; + char orig_str[ETH_STR_LEN]; + + orig_node = ((struct orig_node *)hash_find(orig_hash, addr)); + + if (orig_node != NULL) + return orig_node; + + addr_to_string(orig_str, addr); + debug_log(LOG_TYPE_BATMAN, "Creating new originator: %s \n", orig_str); + + orig_node = kmalloc(sizeof(struct orig_node), GFP_ATOMIC); + memset(orig_node, 0, sizeof(struct orig_node)); + INIT_LIST_HEAD(&orig_node->neigh_list); + + memcpy(orig_node->orig, addr, ETH_ALEN); + orig_node->router = NULL; + orig_node->batman_if = NULL; + orig_node->hna_buff = NULL; + + orig_node->bcast_own = kmalloc(num_ifs * sizeof(TYPE_OF_WORD) * NUM_WORDS, GFP_ATOMIC); + memset(orig_node->bcast_own, 0, num_ifs * sizeof(TYPE_OF_WORD) * NUM_WORDS); + + orig_node->bcast_own_sum = kmalloc(num_ifs * sizeof(uint8_t), GFP_ATOMIC); + memset(orig_node->bcast_own_sum, 0, num_ifs * sizeof(uint8_t)); + + hash_add(orig_hash, orig_node); + + if (orig_hash->elements * 4 > orig_hash->size) { + swaphash = hash_resize(orig_hash, orig_hash->size * 2); + + if (swaphash == NULL) + debug_log(LOG_TYPE_CRIT, "Couldn't resize orig hash table \n"); + else + orig_hash = swaphash; + } + + return orig_node; +} + +void slide_own_bcast_window(struct batman_if *batman_if) +{ + struct hash_it_t *hashit = NULL; + struct orig_node *orig_node; + + spin_lock(&orig_hash_lock); + + while (NULL != (hashit = hash_iterate(orig_hash, hashit))) { + orig_node = hashit->bucket->data; + + bit_get_packet((TYPE_OF_WORD *)&(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]), 1, 0); + orig_node->bcast_own_sum[batman_if->if_num] = bit_packet_count((TYPE_OF_WORD *)&(orig_node->bcast_own[batman_if->if_num * NUM_WORDS])); + } + + spin_unlock(&orig_hash_lock); +} + +static void update_routes(struct orig_node *orig_node, struct neigh_node *neigh_node, unsigned char *hna_buff, int hna_buff_len) +{ + char orig_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN], router_str[ETH_STR_LEN]; + + if (orig_node == NULL) + return; + + if (orig_node->router != neigh_node) { + addr_to_string(orig_str, orig_node->orig); + + /* route deleted */ + if ((orig_node->router != NULL) && (neigh_node == NULL)) { + + debug_log(LOG_TYPE_ROUTES, "Deleting route towards: %s\n", orig_str); + hna_global_del_orig(orig_node, "originator timed out"); + + /* route added */ + } else if ((orig_node->router == NULL) && (neigh_node != NULL)) { + + addr_to_string(neigh_str, neigh_node->addr); + debug_log(LOG_TYPE_ROUTES, "Adding route towards: %s (via %s)\n", orig_str, neigh_str); + hna_global_add_orig(orig_node, hna_buff, hna_buff_len); + + /* route changed */ + } else { + + addr_to_string(neigh_str, neigh_node->addr); + addr_to_string(router_str, orig_node->router->addr); + debug_log(LOG_TYPE_ROUTES, "Changing route towards: %s (now via %s - was via %s)\n", orig_str, neigh_str, router_str); + + } + + if (neigh_node != NULL) + orig_node->batman_if = neigh_node->if_incoming; + else + orig_node->batman_if = NULL; + + orig_node->router = neigh_node; + + /* may be just HNA changed */ + } else { + + 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(orig_node, "originator changed hna"); + + if ((hna_buff_len > 0) && (hna_buff != NULL)) + hna_global_add_orig(orig_node, hna_buff, hna_buff_len); + + } + + } +} + +static int isBidirectionalNeigh(struct orig_node *orig_node, struct orig_node *orig_neigh_node, struct batman_packet *batman_packet, struct batman_if *if_incoming) +{ + struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL; + char orig_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN]; + unsigned char total_count; + + addr_to_string(orig_str, orig_node->orig); + addr_to_string(neigh_str, orig_neigh_node->orig); + + 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 == NULL) + neigh_node = create_neighbor(orig_node, orig_neigh_node, orig_neigh_node->orig, if_incoming); + + 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 == NULL) + neigh_node = create_neighbor(orig_neigh_node, orig_neigh_node, orig_neigh_node->orig, if_incoming); + } + + 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)); + + debug_log(LOG_TYPE_BATMAN, "bidirectional: orig = %-15s neigh = %-15s => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i \n", + orig_str, neigh_str, 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 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; + + debug_log(LOG_TYPE_BATMAN, "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 == NULL) + neigh_node = create_neighbor(orig_node, get_orig_node(ethhdr->h_source), ethhdr->h_source, if_incoming); + else + debug_log(LOG_TYPE_BATMAN, "Updating existing last-hop neighbour 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(orig_node, neigh_node, hna_buff, tmp_hna_buff_len); + return; + +update_hna: + update_routes(orig_node, orig_node->router, hna_buff, tmp_hna_buff_len); + return; +} + +static char count_real_packets(struct ethhdr *ethhdr, struct batman_packet *batman_packet, struct batman_if *if_incoming) +{ + struct orig_node *orig_node; + struct neigh_node *tmp_neigh_node; + char is_duplicate = 0; + + + orig_node = get_orig_node(batman_packet->orig); + if (orig_node == NULL) + return 0; + + + list_for_each_entry(tmp_neigh_node, &orig_node->neigh_list, list) { + + if (!is_duplicate) + 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)) + bit_get_packet(tmp_neigh_node->real_bits, batman_packet->seqno - orig_node->last_real_seqno, 1); + else + bit_get_packet(tmp_neigh_node->real_bits, batman_packet->seqno - orig_node->last_real_seqno, 0); + + tmp_neigh_node->real_packet_count = bit_packet_count(tmp_neigh_node->real_bits); + } + + if (!is_duplicate) { + debug_log(LOG_TYPE_BATMAN, "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; +} + +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 batman_if *batman_if; + struct orig_node *orig_neigh_node, *orig_node; + char orig_str[ETH_STR_LEN], prev_sender_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN]; + char has_directlink_flag; + char is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0, is_broadcast = 0, is_bidirectional, is_single_hop_neigh, is_duplicate; + unsigned short 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); + + addr_to_string(orig_str, batman_packet->orig); + addr_to_string(prev_sender_str, batman_packet->prev_sender); + addr_to_string(neigh_str, ethhdr->h_source); + + has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); + + is_single_hop_neigh = (compare_orig(ethhdr->h_source, batman_packet->orig) ? 1 : 0); + + debug_log(LOG_TYPE_BATMAN, "Received BATMAN packet via NB: %s, IF: %s [%s] (from OG: %s, via prev OG: %s, seqno %d, tq %d, TTL %d, V %d, IDF %d) \n", neigh_str, if_incoming->dev, if_incoming->addr_str, orig_str, prev_sender_str, batman_packet->seqno, batman_packet->tq, batman_packet->ttl, batman_packet->version, has_directlink_flag); + + list_for_each_entry_rcu(batman_if, &if_list, list) { + if (batman_if->if_active != IF_ACTIVE) + 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, broadcastAddr)) + is_broadcast = 1; + } + + if (batman_packet->version != COMPAT_VERSION) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: incompatible batman version (%i) \n", batman_packet->version); + return; + } + + if (is_my_addr) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: received my own broadcast (sender: %s) \n", neigh_str); + return; + } + + if (is_broadcast) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: ignoring all packets with broadcast source addr (sender: %s) \n", neigh_str); + return; + } + + if (is_my_orig) { + orig_neigh_node = get_orig_node(ethhdr->h_source); + + /* neighbour 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)) { + bit_mark((TYPE_OF_WORD *)&(orig_neigh_node->bcast_own[if_incoming->if_num * NUM_WORDS]), 0); + orig_neigh_node->bcast_own_sum[if_incoming->if_num] = bit_packet_count((TYPE_OF_WORD *)&(orig_neigh_node->bcast_own[if_incoming->if_num * NUM_WORDS])); + } + + debug_log(LOG_TYPE_BATMAN, "Drop packet: originator packet from myself (via neighbour) \n"); + return; + } + + if (batman_packet->tq == 0) { + count_real_packets(ethhdr, batman_packet, if_incoming); + + debug_log(LOG_TYPE_BATMAN, "Drop packet: originator packet with tq equal 0 \n"); + return; + } + + if (is_my_oldorig) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: ignoring all rebroadcast echos (sender: %s) \n", neigh_str); + return; + } + + is_duplicate = count_real_packets(ethhdr, batman_packet, if_incoming); + + orig_node = get_orig_node(batman_packet->orig); + if (orig_node == NULL) + 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))) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %s) \n", neigh_str); + 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(ethhdr->h_source)); + if (orig_neigh_node == NULL) + 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 == NULL)) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: OGM via unknown neighbor! \n"); + return; + } + + is_bidirectional = isBidirectionalNeigh(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(orig_node, ethhdr, batman_packet, if_incoming, hna_buff, hna_buff_len, is_duplicate); + + /* is single hop (direct) neighbour */ + 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); + + debug_log(LOG_TYPE_BATMAN, "Forwarding packet: rebroadcast neighbour packet with direct link flag \n"); + return; + } + + /* multihop originator */ + if (!is_bidirectional) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: not received via bidirectional link\n"); + return; + } + + if (is_duplicate) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: duplicate packet received\n"); + return; + } + + debug_log(LOG_TYPE_BATMAN, "Forwarding packet: rebroadcast originator packet \n"); + schedule_forward_packet(orig_node, ethhdr, batman_packet, 0, hna_buff_len, if_incoming); +} + +void purge_orig(struct work_struct *work) +{ + struct list_head *list_pos, *list_pos_tmp; + struct hash_it_t *hashit = NULL; + struct orig_node *orig_node; + struct neigh_node *neigh_node, *best_neigh_node; + char orig_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN], neigh_purged; + + spin_lock(&orig_hash_lock); + + /* for all origins... */ + while (NULL != (hashit = hash_iterate(orig_hash, hashit))) { + + orig_node = hashit->bucket->data; + addr_to_string(orig_str, orig_node->orig); + + if (time_after(jiffies, orig_node->last_valid + ((2 * PURGE_TIMEOUT * HZ) / 1000))) { + + debug_log(LOG_TYPE_BATMAN, "Originator timeout: originator %s, last_valid %u \n", orig_str, (orig_node->last_valid / HZ)); + + hash_remove_bucket(orig_hash, hashit); + free_orig_node(orig_node); + + } else { + + best_neigh_node = NULL; + neigh_purged = 0; + + /* for all neighbours towards this originator ... */ + list_for_each_safe(list_pos, list_pos_tmp, &orig_node->neigh_list) { + neigh_node = list_entry(list_pos, struct neigh_node, list); + + if (time_after(jiffies, neigh_node->last_valid + ((PURGE_TIMEOUT * HZ) / 1000))) { + + addr_to_string(neigh_str, neigh_node->addr); + debug_log(LOG_TYPE_BATMAN, "Neighbour timeout: originator %s, neighbour: %s, last_valid %u \n", orig_str, neigh_str, (neigh_node->last_valid / HZ)); + + neigh_purged = 1; + list_del(list_pos); + kfree(neigh_node); + + } else { + + if ((best_neigh_node == NULL) || (neigh_node->tq_avg > best_neigh_node->tq_avg)) + best_neigh_node = neigh_node; + + } + + } + + if (neigh_purged) + update_routes(orig_node, best_neigh_node, orig_node->hna_buff, orig_node->hna_buff_len); + + } + + } + + spin_unlock(&orig_hash_lock); + + start_purge_timer(); +} + +static int receive_raw_packet(struct socket *raw_sock, unsigned char *packet_buff, int packet_buff_len) +{ + struct kvec iov; + struct msghdr msg; + + iov.iov_base = packet_buff; + iov.iov_len = packet_buff_len; + + msg.msg_flags = MSG_DONTWAIT; /* non-blocking */ + msg.msg_name = NULL; + msg.msg_namelen = 0; + msg.msg_control = NULL; + + return kernel_recvmsg(raw_sock, &msg, &iov, 1, packet_buff_len, MSG_DONTWAIT); +} + +int packet_recv_thread(void *data) +{ + struct batman_if *batman_if; + struct ethhdr *ethhdr; + struct batman_packet *batman_packet; + struct unicast_packet *unicast_packet; + struct bcast_packet *bcast_packet; + struct icmp_packet *icmp_packet; + struct vis_packet *vis_packet; + struct orig_node *orig_node; + unsigned char *packet_buff, src_str[ETH_STR_LEN], dst_str[ETH_STR_LEN]; + int vis_info_len; + int result; + + atomic_set(&data_ready_cond, 0); + atomic_set(&exit_cond, 0); + packet_buff = kmalloc(PACKBUFF_SIZE, GFP_KERNEL); + if (!packet_buff) { + debug_log(LOG_TYPE_CRIT, "Could allocate memory for the packet buffer. :(\n"); + return -1; + } + + while ((!kthread_should_stop()) && (!atomic_read(&exit_cond))) { + + wait_event_interruptible(thread_wait, (atomic_read(&data_ready_cond) || atomic_read(&exit_cond))); + + atomic_set(&data_ready_cond, 0); + + if (kthread_should_stop() || atomic_read(&exit_cond)) + break; + + /* we only want to safely traverse the list, hard-interfaces + * won't be deleted anyway as long as this thread runs. */ + + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { + rcu_read_unlock(); + + result = -1; + + while (1) { + if (batman_if->if_active != IF_ACTIVE) { + if (batman_if->if_active != IF_TO_BE_ACTIVATED) + debug_log(LOG_TYPE_NOTICE, + "Could not read from deactivated interface %s!\n", + batman_if->dev); + + if (batman_if->raw_sock) + receive_raw_packet(batman_if->raw_sock, packet_buff, PACKBUFF_SIZE); + result = 0; + break; + } + + result = receive_raw_packet(batman_if->raw_sock, packet_buff, PACKBUFF_SIZE); + if (result <= 0) + break; + + if (result < sizeof(struct ethhdr) + 2) + continue; + + ethhdr = (struct ethhdr *)packet_buff; + batman_packet = (struct batman_packet *)(packet_buff + sizeof(struct ethhdr)); + + if (batman_packet->version != COMPAT_VERSION) { + debug_log(LOG_TYPE_BATMAN, "Drop packet: incompatible batman version (%i) \n", batman_packet->version); + continue; + } + + switch (batman_packet->packet_type) { + /* batman originator packet */ + case BAT_PACKET: + /* packet with broadcast indication but unicast recipient */ + if (!is_bcast(ethhdr->h_dest)) + continue; + + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + continue; + + /* drop packet if it has not at least one batman packet as payload */ + if (result < sizeof(struct ethhdr) + sizeof(struct batman_packet)) + continue; + + spin_lock(&orig_hash_lock); + receive_aggr_bat_packet(ethhdr, + packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr), + batman_if); + spin_unlock(&orig_hash_lock); + + break; + + /* batman icmp packet */ + case BAT_ICMP: + /* packet with unicast indication but broadcast recipient */ + if (is_bcast(ethhdr->h_dest)) + continue; + + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + continue; + + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + continue; + + /* drop packet if it has not necessary minimum size */ + if (result < sizeof(struct ethhdr) + sizeof(struct icmp_packet)) + continue; + + icmp_packet = (struct icmp_packet *)(packet_buff + sizeof(struct ethhdr)); + + /* packet for me */ + if (is_my_mac(icmp_packet->dst)) { + + /* add data to device queue */ + if (icmp_packet->msg_type != ECHO_REQUEST) { + bat_device_receive_packet(icmp_packet); + continue; + } + + /* answer echo request (ping) */ + /* get routing information */ + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet->orig)); + + if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { + + memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); + memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN); + icmp_packet->msg_type = ECHO_REPLY; + icmp_packet->ttl = TTL; + + send_raw_packet(packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr), + orig_node->batman_if, + orig_node->router->addr); + + } + + spin_unlock(&orig_hash_lock); + continue; + + } + + /* TTL exceeded */ + if (icmp_packet->ttl < 2) { + + addr_to_string(src_str, icmp_packet->orig); + addr_to_string(dst_str, icmp_packet->dst); + + debug_log(LOG_TYPE_NOTICE, "Error - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str); + + /* send TTL exceeded if packet is an echo request (traceroute) */ + if (icmp_packet->msg_type != ECHO_REQUEST) + continue; + + /* get routing information */ + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet->orig)); + + if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { + + memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); + memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN); + icmp_packet->msg_type = TTL_EXCEEDED; + icmp_packet->ttl = TTL; + + send_raw_packet(packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr), + orig_node->batman_if, + orig_node->router->addr); + + } + + spin_unlock(&orig_hash_lock); + continue; + + } + + /* get routing information */ + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet->dst)); + + if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { + + /* decrement ttl */ + icmp_packet->ttl--; + + /* route it */ + send_raw_packet(packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr), + orig_node->batman_if, + orig_node->router->addr); + } + + spin_unlock(&orig_hash_lock); + break; + + /* unicast packet */ + case BAT_UNICAST: + /* packet with unicast indication but broadcast recipient */ + if (is_bcast(ethhdr->h_dest)) + continue; + + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + continue; + + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + continue; + + /* drop packet if it has not necessary minimum size */ + if (result < sizeof(struct ethhdr) + sizeof(struct unicast_packet)) + continue; + + unicast_packet = (struct unicast_packet *)(packet_buff + sizeof(struct ethhdr)); + + /* packet for me */ + if (is_my_mac(unicast_packet->dest)) { + + interface_rx(soft_device, packet_buff + sizeof(struct ethhdr) + sizeof(struct unicast_packet), result - sizeof(struct ethhdr) - sizeof(struct unicast_packet)); + continue; + + } + + /* TTL exceeded */ + if (unicast_packet->ttl < 2) { + addr_to_string(src_str, ((struct ethhdr *)(unicast_packet + 1))->h_source); + addr_to_string(dst_str, unicast_packet->dest); + + debug_log(LOG_TYPE_NOTICE, "Error - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str); + continue; + } + + /* get routing information */ + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *)hash_find(orig_hash, unicast_packet->dest)); + + if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { + /* decrement ttl */ + unicast_packet->ttl--; + + /* route it */ + send_raw_packet(packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr), + orig_node->batman_if, + orig_node->router->addr); + } + + spin_unlock(&orig_hash_lock); + break; + + /* broadcast packet */ + case BAT_BCAST: + /* packet with broadcast indication but unicast recipient */ + if (!is_bcast(ethhdr->h_dest)) + continue; + + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + continue; + + /* drop packet if it has not necessary minimum size */ + if (result < sizeof(struct ethhdr) + sizeof(struct bcast_packet)) + continue; + + /* ignore broadcasts sent by myself */ + if (is_my_mac(ethhdr->h_source)) + continue; + + bcast_packet = (struct bcast_packet *)(packet_buff + sizeof(struct ethhdr)); + + /* ignore broadcasts originated by myself */ + if (is_my_mac(bcast_packet->orig)) + continue; + + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *)hash_find(orig_hash, bcast_packet->orig)); + + if (orig_node == NULL) { + spin_unlock(&orig_hash_lock); + continue; + } + + /* check flood history */ + if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, ntohs(bcast_packet->seqno))) { + spin_unlock(&orig_hash_lock); + continue; + } + + /* mark broadcast in flood history */ + if (bit_get_packet(orig_node->bcast_bits, ntohs(bcast_packet->seqno) - orig_node->last_bcast_seqno, 1)) + orig_node->last_bcast_seqno = ntohs(bcast_packet->seqno); + + spin_unlock(&orig_hash_lock); + + /* broadcast for me */ + interface_rx(soft_device, packet_buff + sizeof(struct ethhdr) + sizeof(struct bcast_packet), result - sizeof(struct ethhdr) - sizeof(struct bcast_packet)); + + /* rebroadcast packet */ + add_bcast_packet_to_list(packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr)); + + break; + + /* vis packet */ + case BAT_VIS: + /* drop if too short. */ + if (result < sizeof(struct ethhdr) + sizeof(struct vis_packet)) + continue; + + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + continue; + + vis_packet = (struct vis_packet *)(packet_buff + sizeof(struct ethhdr)); + vis_info_len = result - sizeof(struct ethhdr) - sizeof(struct vis_packet); + + /* ignore own packets */ + if (is_my_mac(vis_packet->vis_orig)) + continue; + + if (is_my_mac(vis_packet->sender_orig)) + continue; + + switch (vis_packet->vis_type) { + case VIS_TYPE_SERVER_SYNC: + receive_server_sync_packet(vis_packet, vis_info_len); + break; + + case VIS_TYPE_CLIENT_UPDATE: + receive_client_update_packet(vis_packet, vis_info_len); + break; + + default: /* ignore unknown packet */ + break; + } + + break; + } + + } + + if ((result < 0) && (result != -EAGAIN)) + debug_log(LOG_TYPE_CRIT, "Could not receive packet from interface %s: %i\n", batman_if->dev, result); + + /* lock for the next iteration */ + rcu_read_lock(); + } + rcu_read_unlock(); + + } + kfree(packet_buff); + + /* do not exit until kthread_stop() is actually called, otherwise it will wait for us + * forever. */ + while (!kthread_should_stop()) + schedule(); + + return 0; +} + +void batman_data_ready(struct sock *sk, int len) +{ + void (*data_ready)(struct sock *, int) = sk->sk_user_data; + + data_ready(sk, len); + + atomic_set(&data_ready_cond, 1); + wake_up_interruptible(&thread_wait); +} + |