diff options
Diffstat (limited to 'drivers/staging/batman-adv/routing.c')
| -rw-r--r-- | drivers/staging/batman-adv/routing.c | 1304 |
1 files changed, 636 insertions, 668 deletions
diff --git a/drivers/staging/batman-adv/routing.c b/drivers/staging/batman-adv/routing.c index 4a14c363ac2b..d89048beebe1 100644 --- a/drivers/staging/batman-adv/routing.c +++ b/drivers/staging/batman-adv/routing.c @@ -19,304 +19,226 @@ * */ - - - - #include "main.h" #include "routing.h" -#include "log.h" #include "send.h" +#include "hash.h" #include "soft-interface.h" #include "hard-interface.h" #include "device.h" #include "translation-table.h" +#include "originator.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) +void slide_own_bcast_window(struct batman_if *batman_if) { - struct neigh_node *neigh_node; + HASHIT(hashit); + struct orig_node *orig_node; + TYPE_OF_WORD *word; + unsigned long flags; - debug_log(LOG_TYPE_BATMAN, "Creating new last-hop neighbour of originator\n"); + spin_lock_irqsave(&orig_hash_lock, flags); - neigh_node = kmalloc(sizeof(struct neigh_node), GFP_ATOMIC); - memset(neigh_node, 0, sizeof(struct neigh_node)); - INIT_LIST_HEAD(&neigh_node->list); + while (hash_iterate(orig_hash, &hashit)) { + orig_node = hashit.bucket->data; + word = &(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]); - memcpy(neigh_node->addr, neigh, ETH_ALEN); - neigh_node->orig_node = orig_neigh_node; - neigh_node->if_incoming = if_incoming; + bit_get_packet(word, 1, 0); + orig_node->bcast_own_sum[batman_if->if_num] = + bit_packet_count(word); + } - list_add_tail(&neigh_node->list, &orig_node->neigh_list); - return neigh_node; + spin_unlock_irqrestore(&orig_hash_lock, flags); } -void free_orig_node(void *data) +static void update_HNA(struct orig_node *orig_node, + unsigned char *hna_buff, int hna_buff_len) { - struct list_head *list_pos, *list_pos_tmp; - struct neigh_node *neigh_node; - struct orig_node *orig_node = (struct orig_node *)data; + 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))) { - /* 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 (orig_node->hna_buff_len > 0) + hna_global_del_orig(orig_node, + "originator changed hna"); - list_del(list_pos); - kfree(neigh_node); + if ((hna_buff_len > 0) && (hna_buff != NULL)) + hna_global_add_orig(orig_node, hna_buff, hna_buff_len); } - - 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) +static void update_route(struct orig_node *orig_node, + struct neigh_node *neigh_node, + unsigned char *hna_buff, int hna_buff_len) { - 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; + /* route deleted */ + if ((orig_node->router != NULL) && (neigh_node == 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); + bat_dbg(DBG_ROUTES, "Deleting route towards: %pM\n", + orig_node->orig); + hna_global_del_orig(orig_node, "originator timed out"); - 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); + /* route added */ + } else if ((orig_node->router == NULL) && (neigh_node != NULL)) { - if (orig_hash->elements * 4 > orig_hash->size) { - swaphash = hash_resize(orig_hash, orig_hash->size * 2); + bat_dbg(DBG_ROUTES, + "Adding route towards: %pM (via %pM)\n", + orig_node->orig, neigh_node->addr); + hna_global_add_orig(orig_node, hna_buff, hna_buff_len); - if (swaphash == NULL) - debug_log(LOG_TYPE_CRIT, "Couldn't resize orig hash table \n"); - else - orig_hash = swaphash; + /* route changed */ + } else { + bat_dbg(DBG_ROUTES, "Changing route towards: %pM (now via %pM - was via %pM)\n", orig_node->orig, neigh_node->addr, orig_node->router->addr); } - 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])); - } + if (neigh_node != NULL) + orig_node->batman_if = neigh_node->if_incoming; + else + orig_node->batman_if = NULL; - spin_unlock(&orig_hash_lock); + orig_node->router = neigh_node; } -static void update_routes(struct orig_node *orig_node, struct neigh_node *neigh_node, unsigned char *hna_buff, int hna_buff_len) + +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; - + if (orig_node->router != neigh_node) + update_route(orig_node, neigh_node, hna_buff, hna_buff_len); /* 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); - - } - - } + else + update_HNA(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) +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) { + 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)) + 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); + 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) { + 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)) + 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); + 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]); + 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)) + 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; + /* 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 + * 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 */ + 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, "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 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) +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"); + bat_dbg(DBG_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)) { + if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && + (tmp_neigh_node->if_incoming == if_incoming)) { neigh_node = tmp_neigh_node; continue; } @@ -324,19 +246,34 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru 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); + 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"); + if (!neigh_node) { + struct orig_node *orig_tmp; + + orig_tmp = get_orig_node(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, + "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); + 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) { @@ -344,9 +281,11 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru 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); + 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 this neighbor already is our next hop there is nothing + * to change */ if (orig_node->router == neigh_node) goto update_hna; @@ -355,11 +294,12 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru (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 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]))) + (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); @@ -367,60 +307,72 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru 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) +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; - + uint16_t seq_diff; 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); + is_duplicate = + get_bit_status(tmp_neigh_node->real_bits, + orig_node->last_real_seqno, + batman_packet->seqno); + seq_diff = batman_packet->seqno - orig_node->last_real_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, seq_diff, 1); else - bit_get_packet(tmp_neigh_node->real_bits, batman_packet->seqno - orig_node->last_real_seqno, 0); + bit_get_packet(tmp_neigh_node->real_bits, seq_diff, 0); - tmp_neigh_node->real_packet_count = bit_packet_count(tmp_neigh_node->real_bits); + 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); + bat_dbg(DBG_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) +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; + 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; unsigned short if_incoming_seqno; - /* Silently drop when the batman packet is actually not a correct packet. + /* 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) + * 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; @@ -428,27 +380,31 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack /* 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); + 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); + bat_dbg(DBG_BATMAN, "Received BATMAN packet via NB: %pM, IF: %s [%s] (from OG: %pM, via prev OG: %pM, seqno %d, tq %d, TTL %d, V %d, IDF %d) \n", + ethhdr->h_source, if_incoming->dev, if_incoming->addr_str, + batman_packet->orig, batman_packet->prev_sender, + 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)) + 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)) + 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)) + if (compare_orig(batman_packet->prev_sender, + batman_if->net_dev->dev_addr)) is_my_oldorig = 1; if (compare_orig(ethhdr->h_source, broadcastAddr)) @@ -456,44 +412,61 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack } if (batman_packet->version != COMPAT_VERSION) { - debug_log(LOG_TYPE_BATMAN, "Drop packet: incompatible batman version (%i) \n", batman_packet->version); + bat_dbg(DBG_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); + bat_dbg(DBG_BATMAN, + "Drop packet: received my own broadcast (sender: %pM)\n", + ethhdr->h_source); return; } if (is_broadcast) { - debug_log(LOG_TYPE_BATMAN, "Drop packet: ignoring all packets with broadcast source addr (sender: %s) \n", neigh_str); + bat_dbg(DBG_BATMAN, "Drop packet: ignoring all packets with broadcast source addr (sender: %pM) \n", ethhdr->h_source); return; } if (is_my_orig) { + TYPE_OF_WORD *word; + int offset; + 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])); + 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); } - debug_log(LOG_TYPE_BATMAN, "Drop packet: originator packet from myself (via neighbour) \n"); + bat_dbg(DBG_BATMAN, "Drop packet: originator packet from myself (via neighbor) \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"); + bat_dbg(DBG_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); + bat_dbg(DBG_BATMAN, "Drop packet: ignoring all rebroadcast echos (sender: %pM) \n", ethhdr->h_source); return; } @@ -504,507 +477,502 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack 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)) && + 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); + (compare_orig(orig_node->router->addr, + orig_node->router->orig_node->router->addr))) { + bat_dbg(DBG_BATMAN, "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(ethhdr->h_source)); + /* 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"); + /* 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)) { + bat_dbg(DBG_BATMAN, "Drop packet: OGM via unknown neighbor!\n"); return; } - is_bidirectional = isBidirectionalNeigh(orig_node, orig_neigh_node, batman_packet, if_incoming); + 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); + /* 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 */ + /* 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); + 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"); + bat_dbg(DBG_BATMAN, "Forwarding packet: rebroadcast neighbor 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"); + bat_dbg(DBG_BATMAN, + "Drop packet: not received via bidirectional link\n"); return; } if (is_duplicate) { - debug_log(LOG_TYPE_BATMAN, "Drop packet: duplicate packet received\n"); + bat_dbg(DBG_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); + bat_dbg(DBG_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) +int recv_bat_packet(struct sk_buff *skb, + struct batman_if *batman_if) { - 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; - - } - - } + struct ethhdr *ethhdr; + unsigned long flags; + + /* drop packet if it has not necessary minimum size */ + if (skb_headlen(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_bcast(ethhdr->h_dest)) + return NET_RX_DROP; + + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + return NET_RX_DROP; + + spin_lock_irqsave(&orig_hash_lock, flags); + /* TODO: we use headlen instead of "length", because + * only this data is paged in. */ + /* TODO: is another skb_copy needed here? there will be + * written on the data, but nobody (?) should further use + * this data */ + receive_aggr_bat_packet(ethhdr, + skb->data, + skb_headlen(skb), + batman_if); + spin_unlock_irqrestore(&orig_hash_lock, flags); + + kfree_skb(skb); + return NET_RX_SUCCESS; +} - if (neigh_purged) - update_routes(orig_node, best_neigh_node, orig_node->hna_buff, orig_node->hna_buff_len); +static int recv_my_icmp_packet(struct sk_buff *skb) +{ + struct orig_node *orig_node; + struct icmp_packet *icmp_packet; + struct ethhdr *ethhdr; + struct sk_buff *skb_old; + struct batman_if *batman_if; + int ret; + unsigned long flags; + uint8_t dstaddr[ETH_ALEN]; - } + icmp_packet = (struct icmp_packet *) skb->data; + ethhdr = (struct ethhdr *) skb_mac_header(skb); + /* add data to device queue */ + if (icmp_packet->msg_type != ECHO_REQUEST) { + bat_device_receive_packet(icmp_packet); + return NET_RX_DROP; } - spin_unlock(&orig_hash_lock); + /* answer echo request (ping) */ + /* get routing information */ + spin_lock_irqsave(&orig_hash_lock, flags); + orig_node = ((struct orig_node *)hash_find(orig_hash, + icmp_packet->orig)); + ret = NET_RX_DROP; + + if ((orig_node != NULL) && + (orig_node->batman_if != NULL) && + (orig_node->router != NULL)) { + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + batman_if = orig_node->batman_if; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_irqrestore(&orig_hash_lock, flags); + + /* create a copy of the skb, if needed, to modify it. */ + skb_old = NULL; + if (!skb_clone_writable(skb, sizeof(struct icmp_packet))) { + skb_old = skb; + skb = skb_copy(skb, GFP_ATOMIC); + if (!skb) + return NET_RX_DROP; + icmp_packet = (struct icmp_packet *) skb->data; + kfree_skb(skb_old); + } - start_purge_timer(); -} + 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; -static int receive_raw_packet(struct socket *raw_sock, unsigned char *packet_buff, int packet_buff_len) -{ - struct kvec iov; - struct msghdr msg; + send_skb_packet(skb, batman_if, dstaddr); + ret = NET_RX_SUCCESS; - iov.iov_base = packet_buff; - iov.iov_len = packet_buff_len; + } else + spin_unlock_irqrestore(&orig_hash_lock, flags); - 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); + return ret; } -int packet_recv_thread(void *data) +static int recv_icmp_ttl_exceeded(struct sk_buff *skb) { - 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; + struct icmp_packet *icmp_packet; + struct ethhdr *ethhdr; + struct sk_buff *skb_old; + struct batman_if *batman_if; + int ret; + unsigned long flags; + 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) { + printk(KERN_WARNING "batman-adv:Warning - can't forward icmp packet from %pM to %pM: ttl exceeded\n", + icmp_packet->orig, icmp_packet->dst); + return NET_RX_DROP; } - 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); + /* get routing information */ + spin_lock_irqsave(&orig_hash_lock, flags); + orig_node = ((struct orig_node *) + hash_find(orig_hash, icmp_packet->orig)); + ret = NET_RX_DROP; + + if ((orig_node != NULL) && + (orig_node->batman_if != NULL) && + (orig_node->router != NULL)) { + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + batman_if = orig_node->batman_if; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_irqrestore(&orig_hash_lock, flags); + + /* create a copy of the skb, if needed, to modify it. */ + if (!skb_clone_writable(skb, sizeof(struct icmp_packet))) { + skb_old = skb; + skb = skb_copy(skb, GFP_ATOMIC); + if (!skb) + return NET_RX_DROP; + icmp_packet = (struct icmp_packet *) skb->data; + kfree_skb(skb_old); + } - } + 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; - spin_unlock(&orig_hash_lock); - continue; + send_skb_packet(skb, batman_if, dstaddr); + ret = NET_RX_SUCCESS; - } + } else + spin_unlock_irqrestore(&orig_hash_lock, flags); - /* get routing information */ - spin_lock(&orig_hash_lock); - orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet->dst)); + return ret; +} - if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { - /* decrement ttl */ - icmp_packet->ttl--; +int recv_icmp_packet(struct sk_buff *skb) +{ + struct icmp_packet *icmp_packet; + struct ethhdr *ethhdr; + struct orig_node *orig_node; + struct sk_buff *skb_old; + struct batman_if *batman_if; + int hdr_size = sizeof(struct icmp_packet); + int ret; + unsigned long flags; + uint8_t dstaddr[ETH_ALEN]; + + /* drop packet if it has not necessary minimum size */ + if (skb_headlen(skb) < hdr_size) + return NET_RX_DROP; + + ethhdr = (struct ethhdr *)skb_mac_header(skb); + + /* packet with unicast indication but broadcast recipient */ + if (is_bcast(ethhdr->h_dest)) + return NET_RX_DROP; + + /* packet with broadcast sender address */ + if (is_bcast(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 *) skb->data; + + /* packet for me */ + if (is_my_mac(icmp_packet->dst)) + return recv_my_icmp_packet(skb); + + /* TTL exceeded */ + if (icmp_packet->ttl < 2) + return recv_icmp_ttl_exceeded(skb); + + ret = NET_RX_DROP; + + /* get routing information */ + spin_lock_irqsave(&orig_hash_lock, flags); + 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)) { + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + batman_if = orig_node->batman_if; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_irqrestore(&orig_hash_lock, flags); + + /* create a copy of the skb, if needed, to modify it. */ + if (!skb_clone_writable(skb, sizeof(struct icmp_packet))) { + skb_old = skb; + skb = skb_copy(skb, GFP_ATOMIC); + if (!skb) + return NET_RX_DROP; + icmp_packet = (struct icmp_packet *) skb->data; + kfree_skb(skb_old); + } - /* route it */ - send_raw_packet(packet_buff + sizeof(struct ethhdr), - result - sizeof(struct ethhdr), - orig_node->batman_if, - orig_node->router->addr); - } + /* decrement ttl */ + icmp_packet->ttl--; - spin_unlock(&orig_hash_lock); - break; + /* route it */ + send_skb_packet(skb, batman_if, dstaddr); + ret = NET_RX_SUCCESS; - /* unicast packet */ - case BAT_UNICAST: - /* packet with unicast indication but broadcast recipient */ - if (is_bcast(ethhdr->h_dest)) - continue; + } else + spin_unlock_irqrestore(&orig_hash_lock, flags); - /* packet with broadcast sender address */ - if (is_bcast(ethhdr->h_source)) - continue; + return ret; +} - /* not for me */ - if (!is_my_mac(ethhdr->h_dest)) - continue; +int recv_unicast_packet(struct sk_buff *skb) +{ + struct unicast_packet *unicast_packet; + struct orig_node *orig_node; + struct ethhdr *ethhdr; + struct batman_if *batman_if; + struct sk_buff *skb_old; + uint8_t dstaddr[ETH_ALEN]; + int hdr_size = sizeof(struct unicast_packet); + int ret; + unsigned long flags; - /* drop packet if it has not necessary minimum size */ - if (result < sizeof(struct ethhdr) + sizeof(struct unicast_packet)) - continue; + /* drop packet if it has not necessary minimum size */ + if (skb_headlen(skb) < hdr_size) + return NET_RX_DROP; - unicast_packet = (struct unicast_packet *)(packet_buff + sizeof(struct ethhdr)); + ethhdr = (struct ethhdr *) skb_mac_header(skb); - /* packet for me */ - if (is_my_mac(unicast_packet->dest)) { + /* packet with unicast indication but broadcast recipient */ + if (is_bcast(ethhdr->h_dest)) + return NET_RX_DROP; - interface_rx(soft_device, packet_buff + sizeof(struct ethhdr) + sizeof(struct unicast_packet), result - sizeof(struct ethhdr) - sizeof(struct unicast_packet)); - continue; + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + return NET_RX_DROP; - } + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + return NET_RX_DROP; - /* 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); + unicast_packet = (struct unicast_packet *) skb->data; - debug_log(LOG_TYPE_NOTICE, "Error - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str); - continue; - } + /* packet for me */ + if (is_my_mac(unicast_packet->dest)) { + interface_rx(skb, hdr_size); + return NET_RX_SUCCESS; + } - /* get routing information */ - spin_lock(&orig_hash_lock); - orig_node = ((struct orig_node *)hash_find(orig_hash, unicast_packet->dest)); + /* TTL exceeded */ + if (unicast_packet->ttl < 2) { + printk(KERN_WARNING "batman-adv:Warning - can't forward unicast packet from %pM to %pM: ttl exceeded\n", + ethhdr->h_source, unicast_packet->dest); + return NET_RX_DROP; + } - if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { - /* decrement ttl */ - unicast_packet->ttl--; + ret = NET_RX_DROP; + /* get routing information */ + spin_lock_irqsave(&orig_hash_lock, flags); + 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)) { + + /* don't lock while sending the packets ... we therefore + * copy the required data before sending */ + batman_if = orig_node->batman_if; + memcpy(dstaddr, orig_node->router->addr, ETH_ALEN); + spin_unlock_irqrestore(&orig_hash_lock, flags); + + /* create a copy of the skb, if needed, to modify it. */ + if (!skb_clone_writable(skb, sizeof(struct unicast_packet))) { + skb_old = skb; + skb = skb_copy(skb, GFP_ATOMIC); + if (!skb) + return NET_RX_DROP; + unicast_packet = (struct unicast_packet *) skb->data; + kfree_skb(skb_old); + } + /* 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); - } + /* route it */ + send_skb_packet(skb, batman_if, dstaddr); + ret = NET_RX_SUCCESS; - spin_unlock(&orig_hash_lock); - break; + } else + spin_unlock_irqrestore(&orig_hash_lock, flags); - /* broadcast packet */ - case BAT_BCAST: - /* packet with broadcast indication but unicast recipient */ - if (!is_bcast(ethhdr->h_dest)) - continue; + return ret; +} - /* 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; +int recv_bcast_packet(struct sk_buff *skb) +{ + struct orig_node *orig_node; + struct bcast_packet *bcast_packet; + struct ethhdr *ethhdr; + int hdr_size = sizeof(struct bcast_packet); + unsigned long flags; - /* ignore broadcasts sent by myself */ - if (is_my_mac(ethhdr->h_source)) - continue; + /* drop packet if it has not necessary minimum size */ + if (skb_headlen(skb) < hdr_size) + return NET_RX_DROP; - bcast_packet = (struct bcast_packet *)(packet_buff + sizeof(struct ethhdr)); + ethhdr = (struct ethhdr *)skb_mac_header(skb); - /* ignore broadcasts originated by myself */ - if (is_my_mac(bcast_packet->orig)) - continue; + /* packet with broadcast indication but unicast recipient */ + if (!is_bcast(ethhdr->h_dest)) + return NET_RX_DROP; - spin_lock(&orig_hash_lock); - orig_node = ((struct orig_node *)hash_find(orig_hash, bcast_packet->orig)); + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + return NET_RX_DROP; - if (orig_node == NULL) { - spin_unlock(&orig_hash_lock); - continue; - } + /* ignore broadcasts sent by myself */ + if (is_my_mac(ethhdr->h_source)) + return NET_RX_DROP; - /* 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; - } + bcast_packet = (struct bcast_packet *) skb->data; - /* 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); + /* ignore broadcasts originated by myself */ + if (is_my_mac(bcast_packet->orig)) + return NET_RX_DROP; - spin_unlock(&orig_hash_lock); + spin_lock_irqsave(&orig_hash_lock, flags); + orig_node = ((struct orig_node *) + hash_find(orig_hash, bcast_packet->orig)); - /* broadcast for me */ - interface_rx(soft_device, packet_buff + sizeof(struct ethhdr) + sizeof(struct bcast_packet), result - sizeof(struct ethhdr) - sizeof(struct bcast_packet)); + if (orig_node == NULL) { + spin_unlock_irqrestore(&orig_hash_lock, flags); + return NET_RX_DROP; + } - /* rebroadcast packet */ - add_bcast_packet_to_list(packet_buff + sizeof(struct ethhdr), - result - sizeof(struct ethhdr)); + /* check flood history */ + if (get_bit_status(orig_node->bcast_bits, + orig_node->last_bcast_seqno, + ntohs(bcast_packet->seqno))) { + spin_unlock_irqrestore(&orig_hash_lock, flags); + return NET_RX_DROP; + } - break; + /* 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); - /* vis packet */ - case BAT_VIS: - /* drop if too short. */ - if (result < sizeof(struct ethhdr) + sizeof(struct vis_packet)) - continue; + spin_unlock_irqrestore(&orig_hash_lock, flags); - /* not for me */ - if (!is_my_mac(ethhdr->h_dest)) - continue; + /* rebroadcast packet */ + add_bcast_packet_to_list(skb); - vis_packet = (struct vis_packet *)(packet_buff + sizeof(struct ethhdr)); - vis_info_len = result - sizeof(struct ethhdr) - sizeof(struct vis_packet); + /* broadcast for me */ + interface_rx(skb, hdr_size); - /* ignore own packets */ - if (is_my_mac(vis_packet->vis_orig)) - continue; + return NET_RX_SUCCESS; +} - if (is_my_mac(vis_packet->sender_orig)) - continue; +int recv_vis_packet(struct sk_buff *skb) +{ + struct vis_packet *vis_packet; + struct ethhdr *ethhdr; + int hdr_size = sizeof(struct vis_packet); - switch (vis_packet->vis_type) { - case VIS_TYPE_SERVER_SYNC: - receive_server_sync_packet(vis_packet, vis_info_len); - break; + if (skb_headlen(skb) < hdr_size) + return NET_RX_DROP; - case VIS_TYPE_CLIENT_UPDATE: - receive_client_update_packet(vis_packet, vis_info_len); - break; + vis_packet = (struct vis_packet *) skb->data; + ethhdr = (struct ethhdr *)skb_mac_header(skb); - default: /* ignore unknown packet */ - break; - } + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + return NET_RX_DROP; - break; - } + /* 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; - if ((result < 0) && (result != -EAGAIN)) - debug_log(LOG_TYPE_CRIT, "Could not receive packet from interface %s: %i\n", batman_if->dev, result); + switch (vis_packet->vis_type) { + case VIS_TYPE_SERVER_SYNC: + /* TODO: handle fragmented skbs properly */ + receive_server_sync_packet(vis_packet, skb_headlen(skb)); + break; - /* lock for the next iteration */ - rcu_read_lock(); - } - rcu_read_unlock(); + case VIS_TYPE_CLIENT_UPDATE: + /* TODO: handle fragmented skbs properly */ + receive_client_update_packet(vis_packet, skb_headlen(skb)); + break; + default: /* ignore unknown packet */ + break; } - 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); + /* We take a copy of the data in the packet, so we should + always free the skbuf. */ + return NET_RX_DROP; } - |