Author: simon Date: 2009-11-28 18:41:31 +0000 (Sat, 28 Nov 2009) New Revision: 1486

Modified: trunk/batman-adv-kernelland/routing.c Log: Andrews refactored routing.c file patch: "I broke a lot of the big functions up into many smaller ones. This helps with readability and there is now a lot less code squashed against the right margin."

Signed-off-by: Andrew Lunn andrew.lunn@ascom.ch Acked-by: Marek Lindner lindner_marek@yahoo.de Acked-by: Simon Wunderlich simon.wunderlich@s2003.tu-chemnitz.de

Modified: trunk/batman-adv-kernelland/routing.c =================================================================== --- trunk/batman-adv-kernelland/routing.c 2009-11-27 23:08:32 UTC (rev 1485) +++ trunk/batman-adv-kernelland/routing.c 2009-11-28 18:41:31 UTC (rev 1486) @@ -19,10 +19,6 @@ * */

- - - - #include "main.h" #include "routing.h" #include "send.h" @@ -37,8 +33,6 @@ #include "aggregation.h" #include "compat.h"

- - DECLARE_WAIT_QUEUE_HEAD(thread_wait); static DECLARE_DELAYED_WORK(purge_orig_wq, purge_orig);

@@ -83,7 +77,9 @@ 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) +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;

@@ -122,12 +118,14 @@ kfree(orig_node); }

-/* this function finds or creates an originator entry for the given address if it does not exits */ +/* 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]; + int size;

orig_node = ((struct orig_node *)hash_find(orig_hash, addr));

@@ -146,19 +144,23 @@ 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); + size = 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)); + orig_node->bcast_own = kmalloc(size, GFP_ATOMIC); + memset(orig_node->bcast_own, 0, size);

+ size = num_ifs * sizeof(uint8_t); + orig_node->bcast_own_sum = kmalloc(size, GFP_ATOMIC); + memset(orig_node->bcast_own_sum, 0, size); + 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) - printk(KERN_ERR "batman-adv:Couldn't resize orig hash table \n"); + printk(KERN_ERR + "batman-adv:Couldn't resize orig hash table \n"); else orig_hash = swaphash; } @@ -170,75 +172,99 @@ { struct hash_it_t *hashit = NULL; struct orig_node *orig_node; + TYPE_OF_WORD *word;

spin_lock(&orig_hash_lock);

while (NULL != (hashit = hash_iterate(orig_hash, hashit))) { orig_node = hashit->bucket->data; + word = &(orig_node->bcast_own[batman_if->if_num * NUM_WORDS]);

- 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])); + bit_get_packet(word, 1, 0); + orig_node->bcast_own_sum[batman_if->if_num] = + bit_packet_count(word); }

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) +static void update_HNA(struct orig_node *orig_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 ((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 == NULL) - return; + if (orig_node->hna_buff_len > 0) + hna_global_del_orig(orig_node, + "originator changed hna");

- if (orig_node->router != neigh_node) { - addr_to_string(orig_str, orig_node->orig); + if ((hna_buff_len > 0) && (hna_buff != NULL)) + hna_global_add_orig(orig_node, hna_buff, hna_buff_len); + } +}

- /* route deleted */ - if ((orig_node->router != NULL) && (neigh_node == NULL)) { - bat_dbg(DBG_ROUTES, "Deleting route towards: %s\n", - orig_str); - hna_global_del_orig(orig_node, "originator timed out"); +static void update_route(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]; + char router_str[ETH_STR_LEN];

- /* route added */ - } else if ((orig_node->router == NULL) && (neigh_node != NULL)) { + addr_to_string(orig_str, orig_node->orig);

- addr_to_string(neigh_str, neigh_node->addr); - bat_dbg(DBG_ROUTES, "Adding route towards: %s (via %s)\n", orig_str, neigh_str); - hna_global_add_orig(orig_node, hna_buff, hna_buff_len); + /* route deleted */ + if ((orig_node->router != NULL) && (neigh_node == NULL)) {

- /* route changed */ - } else { + bat_dbg(DBG_ROUTES, "Deleting route towards: %s\n", + orig_str); + hna_global_del_orig(orig_node, "originator timed out");

- addr_to_string(neigh_str, neigh_node->addr); - addr_to_string(router_str, orig_node->router->addr); - bat_dbg(DBG_ROUTES, "Changing route towards: %s (now via %s - was via %s)\n", orig_str, neigh_str, router_str); + /* route added */ + } else if ((orig_node->router == NULL) && (neigh_node != NULL)) {

- } + addr_to_string(neigh_str, neigh_node->addr); + bat_dbg(DBG_ROUTES, + "Adding route towards: %s (via %s)\n", + orig_str, neigh_str); + hna_global_add_orig(orig_node, hna_buff, hna_buff_len);

- if (neigh_node != NULL) - orig_node->batman_if = neigh_node->if_incoming; - else - orig_node->batman_if = NULL; + /* route changed */ + } else { + addr_to_string(neigh_str, neigh_node->addr); + addr_to_string(router_str, orig_node->router->addr); + bat_dbg(DBG_ROUTES, "Changing route towards: %s (now via %s - was via %s)\n", orig_str, neigh_str, router_str); + }

- orig_node->router = neigh_node; + if (neigh_node != NULL) + orig_node->batman_if = neigh_node->if_incoming; + else + orig_node->batman_if = NULL;

- /* may be just HNA changed */ - } else { + orig_node->router = neigh_node; +}

- 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"); +static void update_routes(struct orig_node *orig_node, + struct neigh_node *neigh_node, + unsigned char *hna_buff, int hna_buff_len) +{

- if ((hna_buff_len > 0) && (hna_buff != NULL)) - hna_global_add_orig(orig_node, hna_buff, hna_buff_len); + if (orig_node == NULL) + return;

- } - - } + if (orig_node->router != neigh_node) + update_route(orig_node, neigh_node, hna_buff, hna_buff_len); + /* may be just HNA changed */ + 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]; @@ -248,66 +274,100 @@ 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); + 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) { + 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); + 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]); + 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); + 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)); + 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 = %-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); + 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 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; @@ -315,7 +375,8 @@ 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; } @@ -323,19 +384,26 @@ 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); + neigh_node = create_neighbor(orig_node, + get_orig_node(ethhdr->h_source), + ethhdr->h_source, if_incoming); else - bat_dbg(DBG_BATMAN, "Updating existing last-hop neighbour of originator\n"); + bat_dbg(DBG_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); + 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) { @@ -343,9 +411,11 @@ 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;

@@ -354,11 +424,12 @@ (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); @@ -369,29 +440,35 @@ 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) { @@ -403,24 +480,33 @@ 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 orig_str[ETH_STR_LEN], prev_sender_str[ETH_STR_LEN]; + char 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; @@ -434,21 +520,29 @@

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);

- bat_dbg(DBG_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: %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)) + 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)) @@ -456,12 +550,16 @@ }

if (batman_packet->version != COMPAT_VERSION) { - bat_dbg(DBG_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) { - bat_dbg(DBG_BATMAN, "Drop packet: received my own broadcast (sender: %s) \n", neigh_str); + bat_dbg(DBG_BATMAN, + "Drop packet: received my own broadcast (sender: %s)\n", + neigh_str); return; }

@@ -471,14 +569,24 @@ }

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])); + /* 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)) { + 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, "Drop packet: originator packet from myself (via neighbour) \n"); @@ -504,38 +612,50 @@ 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))) { + (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: %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 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)) { + /* 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 */ 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);

bat_dbg(DBG_BATMAN, "Forwarding packet: rebroadcast neighbour packet with direct link flag\n"); return; @@ -543,7 +663,8 @@

/* multihop originator */ if (!is_bidirectional) { - bat_dbg(DBG_BATMAN, "Drop packet: not received via bidirectional link\n"); + bat_dbg(DBG_BATMAN, + "Drop packet: not received via bidirectional link\n"); return; }

@@ -552,65 +673,85 @@ return; }

- bat_dbg(DBG_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) +static bool purge_orig_neigbours(struct orig_node *orig_node, + struct neigh_node **best_neigh_node) { 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; + char neigh_str[ETH_STR_LEN], orig_str[ETH_STR_LEN]; + struct neigh_node *neigh_node; + bool neigh_purged = false;

- spin_lock(&orig_hash_lock); + *best_neigh_node = NULL;

- /* for all origins... */ - while (NULL != (hashit = hash_iterate(orig_hash, hashit))) {

- orig_node = hashit->bucket->data; - addr_to_string(orig_str, orig_node->orig); + /* 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, orig_node->last_valid + ((2 * PURGE_TIMEOUT * HZ) / 1000))) { + if (time_after(jiffies, + (neigh_node->last_valid + + ((PURGE_TIMEOUT * HZ) / 1000)))) {

- bat_dbg(DBG_BATMAN, "Originator timeout: originator %s, last_valid %lu\n", orig_str, (orig_node->last_valid / HZ)); + addr_to_string(neigh_str, neigh_node->addr); + bat_dbg(DBG_BATMAN, "Neighbour timeout: originator %s, neighbour: %s, last_valid %lu\n", orig_str, neigh_str, (neigh_node->last_valid / HZ));

- hash_remove_bucket(orig_hash, hashit); - free_orig_node(orig_node); - + neigh_purged = true; + 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; + } + } + return neigh_purged; +}

- best_neigh_node = NULL; - neigh_purged = 0; +static bool purge_orig_node(struct orig_node *orig_node) +{ + struct neigh_node *best_neigh_node; + char orig_str[ETH_STR_LEN];

- /* 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); + addr_to_string(orig_str, orig_node->orig);

- if (time_after(jiffies, neigh_node->last_valid + ((PURGE_TIMEOUT * HZ) / 1000))) { + if (time_after(jiffies, + (orig_node->last_valid + + ((2 * PURGE_TIMEOUT * HZ) / 1000)))) {

- addr_to_string(neigh_str, neigh_node->addr); - bat_dbg(DBG_BATMAN, "Neighbour timeout: originator %s, neighbour: %s, last_valid %lu\n", orig_str, neigh_str, (neigh_node->last_valid / HZ)); + bat_dbg(DBG_BATMAN, + "Originator timeout: originator %s, last_valid %lu\n", + orig_str, (orig_node->last_valid / HZ)); + return true; + } else { + if (purge_orig_neigbours(orig_node, &best_neigh_node)) + update_routes(orig_node, best_neigh_node, + orig_node->hna_buff, + orig_node->hna_buff_len); + } + return false; +}

- neigh_purged = 1; - list_del(list_pos); - kfree(neigh_node);

- } else { +void purge_orig(struct work_struct *work) +{ + struct hash_it_t *hashit = NULL; + struct orig_node *orig_node;

- if ((best_neigh_node == NULL) || (neigh_node->tq_avg > best_neigh_node->tq_avg)) - best_neigh_node = neigh_node; + spin_lock(&orig_hash_lock);

- } - - } - - if (neigh_purged) - update_routes(orig_node, best_neigh_node, orig_node->hna_buff, orig_node->hna_buff_len); - + /* for all origins... */ + while (NULL != (hashit = hash_iterate(orig_hash, hashit))) { + orig_node = hashit->bucket->data; + if (purge_orig_node(orig_node)) { + hash_remove_bucket(orig_hash, hashit); + free_orig_node(orig_node); } - }

spin_unlock(&orig_hash_lock); @@ -618,7 +759,8 @@ start_purge_timer(); }

-static int receive_raw_packet(struct socket *raw_sock, unsigned char *packet_buff, int packet_buff_len) +static int receive_raw_packet(struct socket *raw_sock, + unsigned char *packet_buff, int packet_buff_len) { struct kvec iov; struct msghdr msg; @@ -631,367 +773,495 @@ msg.msg_namelen = 0; msg.msg_control = NULL;

- return kernel_recvmsg(raw_sock, &msg, &iov, 1, packet_buff_len, MSG_DONTWAIT); + return kernel_recvmsg(raw_sock, &msg, &iov, 1, packet_buff_len, + MSG_DONTWAIT); }

-int packet_recv_thread(void *data) +static void recv_bat_packet(struct ethhdr *ethhdr, + unsigned char *packet_buff, + int result, + struct batman_if *batman_if) { - 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; + /* packet with broadcast indication but unicast recipient */ + if (!is_bcast(ethhdr->h_dest)) + return; + + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + return; + + /* drop packet if it has not at least one batman packet as payload */ + if (result < sizeof(struct ethhdr) + sizeof(struct batman_packet)) + return; + + 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); +} + +static void recv_my_icmp_packet(struct ethhdr *ethhdr, + struct icmp_packet *icmp_packet, + unsigned char *packet_buff, + int result) +{ 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) { - printk(KERN_ERR "batman-adv:Could allocate memory for the packet buffer. :(\n"); - return -1; + /* add data to device queue */ + if (icmp_packet->msg_type != ECHO_REQUEST) { + bat_device_receive_packet(icmp_packet); + return; }

- while ((!kthread_should_stop()) && (!atomic_read(&exit_cond))) { + /* answer echo request (ping) */ + /* get routing information */ + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *)hash_find(orig_hash, + icmp_packet->orig));

- wait_event_interruptible(thread_wait, (atomic_read(&data_ready_cond) || atomic_read(&exit_cond))); + 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;

- atomic_set(&data_ready_cond, 0); + send_raw_packet(packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr), + orig_node->batman_if, + orig_node->router->addr); + }

- if (kthread_should_stop() || atomic_read(&exit_cond)) - break; + spin_unlock(&orig_hash_lock); + return; +}

- /* we only want to safely traverse the list, hard-interfaces - * won't be deleted anyway as long as this thread runs. */ +static void recv_icmp_ttl_exceeded(struct icmp_packet *icmp_packet, + struct ethhdr *ethhdr, + unsigned char *packet_buff, + int result, + struct batman_if *batman_if) +{ + unsigned char src_str[ETH_STR_LEN], dst_str[ETH_STR_LEN]; + struct orig_node *orig_node;

- rcu_read_lock(); - list_for_each_entry_rcu(batman_if, &if_list, list) { - rcu_read_unlock(); + addr_to_string(src_str, icmp_packet->orig); + addr_to_string(dst_str, icmp_packet->dst);

- result = -1; + printk(KERN_WARNING "batman-adv:Warning - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str);

- while (1) { - if (batman_if->if_active != IF_ACTIVE) { - if (batman_if->if_active != IF_TO_BE_ACTIVATED) - printk(KERN_WARNING - "batman-adv:Could not read from deactivated interface %s!\n", - batman_if->dev); + /* send TTL exceeded if packet is an echo request (traceroute) */ + if (icmp_packet->msg_type != ECHO_REQUEST) + return;

- if (batman_if->raw_sock) - receive_raw_packet(batman_if->raw_sock, packet_buff, PACKBUFF_SIZE); - result = 0; - break; - } + /* get routing information */ + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(orig_hash, icmp_packet->orig));

- result = receive_raw_packet(batman_if->raw_sock, packet_buff, PACKBUFF_SIZE); - if (result <= 0) - break; + 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;

- if (result < sizeof(struct ethhdr) + 2) - continue; + send_raw_packet(packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr), + orig_node->batman_if, + orig_node->router->addr);

- ethhdr = (struct ethhdr *)packet_buff; - batman_packet = (struct batman_packet *)(packet_buff + sizeof(struct ethhdr)); + }

- if (batman_packet->version != COMPAT_VERSION) { - bat_dbg(DBG_BATMAN, "Drop packet: incompatible batman version (%i)\n", batman_packet->version); - continue; - } + spin_unlock(&orig_hash_lock); +}

- 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; +static void recv_icmp_packet(struct ethhdr *ethhdr, + unsigned char *packet_buff, + int result, + struct batman_if *batman_if) +{ + struct icmp_packet *icmp_packet; + struct orig_node *orig_node;

- 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); + /* packet with unicast indication but broadcast recipient */ + if (is_bcast(ethhdr->h_dest)) + return;

- break; + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + return;

- /* batman icmp packet */ - case BAT_ICMP: - /* packet with unicast indication but broadcast recipient */ - if (is_bcast(ethhdr->h_dest)) - continue; + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + return;

- /* 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 icmp_packet)) + return;

- /* not for me */ - if (!is_my_mac(ethhdr->h_dest)) - continue; + icmp_packet = (struct icmp_packet *) + (packet_buff + sizeof(struct ethhdr));

- /* drop packet if it has not necessary minimum size */ - if (result < sizeof(struct ethhdr) + sizeof(struct icmp_packet)) - continue; + /* packet for me */ + if (is_my_mac(icmp_packet->dst)) + recv_my_icmp_packet(ethhdr, icmp_packet, packet_buff, result);

- icmp_packet = (struct icmp_packet *)(packet_buff + sizeof(struct ethhdr)); + /* TTL exceeded */ + if (icmp_packet->ttl < 2) { + recv_icmp_ttl_exceeded(icmp_packet, ethhdr, packet_buff, result, + batman_if); + return;

- /* 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; - } + /* get routing information */ + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(orig_hash, icmp_packet->dst));

- /* 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)) {

- if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { + /* decrement ttl */ + icmp_packet->ttl--;

- 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; + /* 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); +}

- send_raw_packet(packet_buff + sizeof(struct ethhdr), - result - sizeof(struct ethhdr), - orig_node->batman_if, - orig_node->router->addr); +static void recv_unicast_packet(struct ethhdr *ethhdr, + unsigned char *packet_buff, + int result, + struct batman_if *batman_if) +{ + struct unicast_packet *unicast_packet; + unsigned char src_str[ETH_STR_LEN], dst_str[ETH_STR_LEN]; + struct orig_node *orig_node; + int hdr_size = sizeof(struct ethhdr) + sizeof(struct unicast_packet);

- } + /* packet with unicast indication but broadcast recipient */ + if (is_bcast(ethhdr->h_dest)) + return;

- spin_unlock(&orig_hash_lock); - continue; + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + return;

- } + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + return;

- /* TTL exceeded */ - if (icmp_packet->ttl < 2) { + /* drop packet if it has not necessary minimum size */ + if (result < hdr_size) + return;

- addr_to_string(src_str, icmp_packet->orig); - addr_to_string(dst_str, icmp_packet->dst); + unicast_packet = (struct unicast_packet *) + (packet_buff + sizeof(struct ethhdr));

- printk(KERN_WARNING "batman-adv:Warning - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str); + /* packet for me */ + if (is_my_mac(unicast_packet->dest)) { + interface_rx(soft_device, packet_buff + hdr_size, + result - hdr_size); + return;

- /* 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)); + /* 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);

- if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { + printk(KERN_WARNING "batman-adv:Warning - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str); + return; + }

- 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; + /* get routing information */ + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(orig_hash, unicast_packet->dest));

- send_raw_packet(packet_buff + sizeof(struct ethhdr), - result - sizeof(struct ethhdr), - orig_node->batman_if, - orig_node->router->addr); + 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); +}

- spin_unlock(&orig_hash_lock); - continue;

- } +static void recv_bcast_packet(struct ethhdr *ethhdr, + unsigned char *packet_buff, + int result, + struct batman_if *batman_if) +{ + struct orig_node *orig_node; + struct bcast_packet *bcast_packet; + int hdr_size = sizeof(struct ethhdr) + sizeof(struct bcast_packet);

- /* get routing information */ - spin_lock(&orig_hash_lock); - orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet->dst)); + /* packet with broadcast indication but unicast recipient */ + if (!is_bcast(ethhdr->h_dest)) + return;

- if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { + /* packet with broadcast sender address */ + if (is_bcast(ethhdr->h_source)) + return;

- /* decrement ttl */ - icmp_packet->ttl--; + /* drop packet if it has not necessary minimum size */ + if (result < hdr_size) + return;

- /* route it */ - send_raw_packet(packet_buff + sizeof(struct ethhdr), - result - sizeof(struct ethhdr), - orig_node->batman_if, - orig_node->router->addr); - } + /* ignore broadcasts sent by myself */ + if (is_my_mac(ethhdr->h_source)) + return;

- spin_unlock(&orig_hash_lock); - break; + bcast_packet = (struct bcast_packet *) + (packet_buff + sizeof(struct ethhdr));

- /* unicast packet */ - case BAT_UNICAST: - /* packet with unicast indication but broadcast recipient */ - if (is_bcast(ethhdr->h_dest)) - continue; + /* ignore broadcasts originated by myself */ + if (is_my_mac(bcast_packet->orig)) + return;

- /* packet with broadcast sender address */ - if (is_bcast(ethhdr->h_source)) - continue; + spin_lock(&orig_hash_lock); + orig_node = ((struct orig_node *) + hash_find(orig_hash, bcast_packet->orig));

- /* not for me */ - if (!is_my_mac(ethhdr->h_dest)) - continue; + if (orig_node == NULL) { + spin_unlock(&orig_hash_lock); + return; + }

- /* drop packet if it has not necessary minimum size */ - if (result < sizeof(struct ethhdr) + sizeof(struct unicast_packet)) - 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); + return; + }

- unicast_packet = (struct unicast_packet *)(packet_buff + sizeof(struct ethhdr)); + /* 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);

- /* packet for me */ - if (is_my_mac(unicast_packet->dest)) { + spin_unlock(&orig_hash_lock);

- interface_rx(soft_device, packet_buff + sizeof(struct ethhdr) + sizeof(struct unicast_packet), result - sizeof(struct ethhdr) - sizeof(struct unicast_packet)); - continue; + /* broadcast for me */ + interface_rx(soft_device, packet_buff + hdr_size, result - hdr_size);

- } + /* rebroadcast packet */ + add_bcast_packet_to_list(packet_buff + sizeof(struct ethhdr), + result - sizeof(struct ethhdr)); +}

- /* 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); +static void recv_vis_packet(struct ethhdr *ethhdr, + unsigned char *packet_buff, + int result) +{ + struct vis_packet *vis_packet; + int hdr_size = sizeof(struct ethhdr) + sizeof(struct vis_packet); + int vis_info_len;

- printk(KERN_WARNING "batman-adv:Warning - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str); - continue; - } + /* drop if too short. */ + if (result < hdr_size) + return;

- /* get routing information */ - spin_lock(&orig_hash_lock); - orig_node = ((struct orig_node *)hash_find(orig_hash, unicast_packet->dest)); + /* not for me */ + if (!is_my_mac(ethhdr->h_dest)) + return;

- if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { - /* decrement ttl */ - unicast_packet->ttl--; + vis_packet = (struct vis_packet *)(packet_buff + sizeof(struct ethhdr)); + vis_info_len = result - hdr_size;

- /* route it */ - send_raw_packet(packet_buff + sizeof(struct ethhdr), - result - sizeof(struct ethhdr), - orig_node->batman_if, - orig_node->router->addr); - } + /* ignore own packets */ + if (is_my_mac(vis_packet->vis_orig)) + return;

- spin_unlock(&orig_hash_lock); - break; + if (is_my_mac(vis_packet->sender_orig)) + return;

- /* broadcast packet */ - case BAT_BCAST: - /* packet with broadcast indication but unicast recipient */ - if (!is_bcast(ethhdr->h_dest)) - continue; + switch (vis_packet->vis_type) { + case VIS_TYPE_SERVER_SYNC: + receive_server_sync_packet(vis_packet, vis_info_len); + break;

- /* packet with broadcast sender address */ - if (is_bcast(ethhdr->h_source)) - continue; + case VIS_TYPE_CLIENT_UPDATE: + receive_client_update_packet(vis_packet, vis_info_len); + break;

- /* drop packet if it has not necessary minimum size */ - if (result < sizeof(struct ethhdr) + sizeof(struct bcast_packet)) - continue; + default: /* ignore unknown packet */ + break; + } +}

- /* ignore broadcasts sent by myself */ - if (is_my_mac(ethhdr->h_source)) - continue; +static int recv_one_packet(struct batman_if *batman_if, + unsigned char *packet_buff) +{ + int result; + struct ethhdr *ethhdr; + struct batman_packet *batman_packet;

- bcast_packet = (struct bcast_packet *)(packet_buff + sizeof(struct ethhdr)); + result = receive_raw_packet(batman_if->raw_sock, packet_buff, + PACKBUFF_SIZE); + if (result <= 0) + return result;

- /* ignore broadcasts originated by myself */ - if (is_my_mac(bcast_packet->orig)) - continue; + if (result < sizeof(struct ethhdr) + 2) + return 0;

- spin_lock(&orig_hash_lock); - orig_node = ((struct orig_node *)hash_find(orig_hash, bcast_packet->orig)); + ethhdr = (struct ethhdr *)packet_buff; + batman_packet = (struct batman_packet *) + (packet_buff + sizeof(struct ethhdr));

- if (orig_node == NULL) { - spin_unlock(&orig_hash_lock); - continue; - } + if (batman_packet->version != COMPAT_VERSION) { + bat_dbg(DBG_BATMAN, + "Drop packet: incompatible batman version (%i)\n", + batman_packet->version); + return 0; + }

- /* 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; - } + switch (batman_packet->packet_type) { + /* batman originator packet */ + case BAT_PACKET: + recv_bat_packet(ethhdr, packet_buff, result, batman_if); + 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); + /* batman icmp packet */ + case BAT_ICMP: + recv_icmp_packet(ethhdr, packet_buff, result, batman_if); + break;

- spin_unlock(&orig_hash_lock); + /* unicast packet */ + case BAT_UNICAST: + recv_unicast_packet(ethhdr, packet_buff, result, batman_if); + break;

- /* broadcast for me */ - interface_rx(soft_device, packet_buff + sizeof(struct ethhdr) + sizeof(struct bcast_packet), result - sizeof(struct ethhdr) - sizeof(struct bcast_packet)); + /* broadcast packet */ + case BAT_BCAST: + recv_bcast_packet(ethhdr, + packet_buff, result, batman_if); + break;

- /* rebroadcast packet */ - add_bcast_packet_to_list(packet_buff + sizeof(struct ethhdr), - result - sizeof(struct ethhdr)); + /* vis packet */ + case BAT_VIS: + recv_vis_packet(ethhdr, packet_buff, result); + break; + } + return 0; +}

- break;

- /* vis packet */ - case BAT_VIS: - /* drop if too short. */ - if (result < sizeof(struct ethhdr) + sizeof(struct vis_packet)) - continue; +static int discard_one_packet(struct batman_if *batman_if, + unsigned char *packet_buff) +{ + int result = -EAGAIN;

- /* not for me */ - if (!is_my_mac(ethhdr->h_dest)) - continue; + if (batman_if->if_active != IF_TO_BE_ACTIVATED) { + printk(KERN_WARNING + "batman-adv:Could not read from deactivated interface %s!\n", + batman_if->dev); + } else { + if (batman_if->raw_sock) + result = receive_raw_packet(batman_if->raw_sock, + packet_buff, + PACKBUFF_SIZE); + } + return result; +}

- 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; +static bool is_interface_active(struct batman_if *batman_if) +{ + if (batman_if->if_active != IF_ACTIVE) + return false;

- if (is_my_mac(vis_packet->sender_orig)) - continue; + return true; +}

- switch (vis_packet->vis_type) { - case VIS_TYPE_SERVER_SYNC: - receive_server_sync_packet(vis_packet, vis_info_len); - break; +static void service_interface(struct batman_if *batman_if, + unsigned char *packet_buff)

- case VIS_TYPE_CLIENT_UPDATE: - receive_client_update_packet(vis_packet, vis_info_len); - break; +{ + int result;

- default: /* ignore unknown packet */ - break; - } + do { + if (is_interface_active(batman_if)) + result = recv_one_packet(batman_if, packet_buff); + else + result = discard_one_packet(batman_if, packet_buff); + } while (result >= 0);

- break; - } + /* we perform none blocking reads, so EAGAIN indicates there + are no more packets to read. Anything else is a real + error.*/

- } + if ((result < 0) && (result != -EAGAIN)) + printk(KERN_ERR "batman-adv:Could not receive packet from interface %s: %i\n", batman_if->dev, result); +}

- if ((result < 0) && (result != -EAGAIN)) - printk(KERN_ERR "batman-adv:Could not receive packet from interface %s: %i\n", batman_if->dev, result); - - /* lock for the next iteration */ - rcu_read_lock(); - } +static void service_interfaces(unsigned char *packet_buffer) +{ + struct batman_if *batman_if; + rcu_read_lock(); + list_for_each_entry_rcu(batman_if, &if_list, list) { rcu_read_unlock(); + service_interface(batman_if, packet_buffer); + rcu_read_lock(); + } + rcu_read_unlock(); +}

+ +int packet_recv_thread(void *data) +{ + unsigned char *packet_buff; + + atomic_set(&data_ready_cond, 0); + atomic_set(&exit_cond, 0); + packet_buff = kmalloc(PACKBUFF_SIZE, GFP_KERNEL); + if (!packet_buff) { + printk(KERN_ERR"batman-adv: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; + + service_interfaces(packet_buff); + } kfree(packet_buff);

- /* do not exit until kthread_stop() is actually called, otherwise it will wait for us - * forever. */ + /* do not exit until kthread_stop() is actually called, + * otherwise it will wait for us forever. */ while (!kthread_should_stop()) schedule();