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Commit 4efe0b06 authored by Andrew Lunn's avatar Andrew Lunn Committed by Greg Kroah-Hartman
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Staging: batman-adv: Refactor routing.c 

Break up 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 hand margin.
Signed-off-by: default avatarAndrew Lunn <andrew@lunn.ch>
Acked-by: default avatarMarek Lindner <lindner_marek@yahoo.de>
Acked-by: default avatarSimon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent bad2239e
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Showing with 709 additions and 439 deletions
drivers/staging/batman-adv/routing.c
View file @ 4efe0b06
...@@ -19,10 +19,6 @@ ...@@ -19,10 +19,6 @@
* *
*/ */
#include "main.h" #include "main.h"
#include "routing.h" #include "routing.h"
#include "send.h" #include "send.h"
...@@ -37,8 +33,6 @@ ...@@ -37,8 +33,6 @@
#include "aggregation.h" #include "aggregation.h"
#include "compat.h" #include "compat.h"
DECLARE_WAIT_QUEUE_HEAD(thread_wait); DECLARE_WAIT_QUEUE_HEAD(thread_wait);
static DECLARE_DELAYED_WORK(purge_orig_wq, purge_orig); static DECLARE_DELAYED_WORK(purge_orig_wq, purge_orig);
...@@ -83,7 +77,9 @@ void originator_free(void) ...@@ -83,7 +77,9 @@ void originator_free(void)
spin_unlock(&orig_hash_lock); 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; struct neigh_node *neigh_node;
...@@ -122,12 +118,14 @@ void free_orig_node(void *data) ...@@ -122,12 +118,14 @@ void free_orig_node(void *data)
kfree(orig_node); 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) static struct orig_node *get_orig_node(uint8_t *addr)
{ {
struct orig_node *orig_node; struct orig_node *orig_node;
struct hashtable_t *swaphash; struct hashtable_t *swaphash;
char orig_str[ETH_STR_LEN]; char orig_str[ETH_STR_LEN];
int size;
orig_node = ((struct orig_node *)hash_find(orig_hash, addr)); orig_node = ((struct orig_node *)hash_find(orig_hash, addr));
...@@ -146,11 +144,14 @@ static struct orig_node *get_orig_node(uint8_t *addr) ...@@ -146,11 +144,14 @@ static struct orig_node *get_orig_node(uint8_t *addr)
orig_node->batman_if = NULL; orig_node->batman_if = NULL;
orig_node->hna_buff = NULL; orig_node->hna_buff = NULL;
orig_node->bcast_own = kmalloc(num_ifs * sizeof(TYPE_OF_WORD) * NUM_WORDS, GFP_ATOMIC); size = num_ifs * sizeof(TYPE_OF_WORD) * NUM_WORDS;
memset(orig_node->bcast_own, 0, num_ifs * sizeof(TYPE_OF_WORD) * NUM_WORDS);
orig_node->bcast_own = kmalloc(size, GFP_ATOMIC);
memset(orig_node->bcast_own, 0, size);
orig_node->bcast_own_sum = kmalloc(num_ifs * sizeof(uint8_t), GFP_ATOMIC); size = num_ifs * sizeof(uint8_t);
memset(orig_node->bcast_own_sum, 0, 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); hash_add(orig_hash, orig_node);
...@@ -158,7 +159,8 @@ static struct orig_node *get_orig_node(uint8_t *addr) ...@@ -158,7 +159,8 @@ static struct orig_node *get_orig_node(uint8_t *addr)
swaphash = hash_resize(orig_hash, orig_hash->size * 2); swaphash = hash_resize(orig_hash, orig_hash->size * 2);
if (swaphash == NULL) 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 else
orig_hash = swaphash; orig_hash = swaphash;
} }
...@@ -170,75 +172,99 @@ void slide_own_bcast_window(struct batman_if *batman_if) ...@@ -170,75 +172,99 @@ void slide_own_bcast_window(struct batman_if *batman_if)
{ {
struct hash_it_t *hashit = NULL; struct hash_it_t *hashit = NULL;
struct orig_node *orig_node; struct orig_node *orig_node;
TYPE_OF_WORD *word;
spin_lock(&orig_hash_lock); spin_lock(&orig_hash_lock);
while (NULL != (hashit = hash_iterate(orig_hash, hashit))) { while (NULL != (hashit = hash_iterate(orig_hash, hashit))) {
orig_node = hashit->bucket->data; 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); bit_get_packet(word, 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])); orig_node->bcast_own_sum[batman_if->if_num] =
bit_packet_count(word);
} }
spin_unlock(&orig_hash_lock); 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) if (orig_node->hna_buff_len > 0)
return; hna_global_del_orig(orig_node,
"originator changed hna");
if (orig_node->router != neigh_node) {
addr_to_string(orig_str, orig_node->orig);
/* 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");
/* route added */ if ((hna_buff_len > 0) && (hna_buff != NULL))
} 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); hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
}
}
/* route changed */ static void update_route(struct orig_node *orig_node,
} else { 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];
addr_to_string(neigh_str, neigh_node->addr); addr_to_string(orig_str, orig_node->orig);
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 deleted */
if ((orig_node->router != NULL) && (neigh_node == NULL)) {
if (neigh_node != NULL) bat_dbg(DBG_ROUTES, "Deleting route towards: %s\n",
orig_node->batman_if = neigh_node->if_incoming; orig_str);
else hna_global_del_orig(orig_node, "originator timed out");
orig_node->batman_if = NULL;
orig_node->router = neigh_node; /* route added */
} else if ((orig_node->router == NULL) && (neigh_node != NULL)) {
/* may be just HNA changed */ 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 changed */
} else { } 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);
}
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 (neigh_node != NULL)
orig_node->batman_if = neigh_node->if_incoming;
else
orig_node->batman_if = NULL;
if (orig_node->hna_buff_len > 0) orig_node->router = neigh_node;
hna_global_del_orig(orig_node, "originator changed hna"); }
if ((hna_buff_len > 0) && (hna_buff != NULL))
hna_global_add_orig(orig_node, hna_buff, hna_buff_len);
} static void update_routes(struct orig_node *orig_node,
struct neigh_node *neigh_node,
unsigned char *hna_buff, int 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; struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
char orig_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN]; char orig_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN];
...@@ -248,66 +274,100 @@ static int isBidirectionalNeigh(struct orig_node *orig_node, struct orig_node *o ...@@ -248,66 +274,100 @@ static int isBidirectionalNeigh(struct orig_node *orig_node, struct orig_node *o
addr_to_string(neigh_str, orig_neigh_node->orig); addr_to_string(neigh_str, orig_neigh_node->orig);
if (orig_node == orig_neigh_node) { 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; neigh_node = tmp_neigh_node;
} }
if (neigh_node == NULL) 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; neigh_node->last_valid = jiffies;
} else { } else {
/* find packet count of corresponding one hop neighbor */ /* 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; neigh_node = tmp_neigh_node;
} }
if (neigh_node == NULL) 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; orig_node->last_valid = jiffies;
/* pay attention to not get a value bigger than 100 % */ /* 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 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 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; orig_neigh_node->tq_own = 0;
else else
/* neigh_node->real_packet_count is never zero as we only purge old information when getting new information */ /* neigh_node->real_packet_count is never zero as we
orig_neigh_node->tq_own = (TQ_MAX_VALUE * total_count) / neigh_node->real_packet_count; * 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 * 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
* this does affect the nearly-symmetric links only a little, * affect the nearly-symmetric links only a little, but
* but punishes asymmetric links more. * punishes asymmetric links more. This will give a value
* this will give a value between 0 and TQ_MAX_VALUE * between 0 and TQ_MAX_VALUE
*/ */
orig_neigh_node->tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE * orig_neigh_node->tq_asym_penalty =
(TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * TQ_MAX_VALUE -
(TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) * (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 * TQ_LOCAL_WINDOW_SIZE * TQ_LOCAL_WINDOW_SIZE); (TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count) *
(TQ_LOCAL_WINDOW_SIZE - neigh_node->real_packet_count)) /
batman_packet->tq = ((batman_packet->tq * orig_neigh_node->tq_own * orig_neigh_node->tq_asym_penalty) / (TQ_MAX_VALUE * TQ_MAX_VALUE)); (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 = %-15s neigh = %-15s => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i \n", 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) if (batman_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
return 1; return 1;
return 0; 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; struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
int tmp_hna_buff_len; int tmp_hna_buff_len;
...@@ -315,7 +375,8 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru ...@@ -315,7 +375,8 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru
bat_dbg(DBG_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) { 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; neigh_node = tmp_neigh_node;
continue; continue;
} }
...@@ -323,19 +384,26 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru ...@@ -323,19 +384,26 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru
if (is_duplicate) if (is_duplicate)
continue; continue;
ring_buffer_set(tmp_neigh_node->tq_recv, &tmp_neigh_node->tq_index, 0); ring_buffer_set(tmp_neigh_node->tq_recv,
tmp_neigh_node->tq_avg = ring_buffer_avg(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) 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 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; orig_node->flags = batman_packet->flags;
neigh_node->last_valid = jiffies; 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); neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
if (!is_duplicate) { if (!is_duplicate) {
...@@ -343,9 +411,11 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru ...@@ -343,9 +411,11 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru
neigh_node->last_ttl = batman_packet->ttl; neigh_node->last_ttl = batman_packet->ttl;
} }
tmp_hna_buff_len = (hna_buff_len > batman_packet->num_hna * ETH_ALEN ? batman_packet->num_hna * ETH_ALEN : hna_buff_len); 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) if (orig_node->router == neigh_node)
goto update_hna; goto update_hna;
...@@ -354,11 +424,12 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru ...@@ -354,11 +424,12 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru
(orig_node->router->tq_avg > neigh_node->tq_avg)) (orig_node->router->tq_avg > neigh_node->tq_avg))
goto update_hna; 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) && if ((orig_node->router) &&
((neigh_node->tq_avg == orig_node->router->tq_avg) && ((neigh_node->tq_avg == orig_node->router->tq_avg) &&
(orig_node->router->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]))) >= neigh_node->orig_node->bcast_own_sum[if_incoming->if_num])))
goto update_hna; goto update_hna;
update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len); update_routes(orig_node, neigh_node, hna_buff, tmp_hna_buff_len);
...@@ -369,29 +440,35 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru ...@@ -369,29 +440,35 @@ static void update_orig(struct orig_node *orig_node, struct ethhdr *ethhdr, stru
return; 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 orig_node *orig_node;
struct neigh_node *tmp_neigh_node; struct neigh_node *tmp_neigh_node;
char is_duplicate = 0; char is_duplicate = 0;
uint16_t seq_diff;
orig_node = get_orig_node(batman_packet->orig); orig_node = get_orig_node(batman_packet->orig);
if (orig_node == NULL) if (orig_node == NULL)
return 0; return 0;
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 (!is_duplicate) if (!is_duplicate)
is_duplicate = get_bit_status(tmp_neigh_node->real_bits, orig_node->last_real_seqno, batman_packet->seqno); is_duplicate =
get_bit_status(tmp_neigh_node->real_bits,
if (compare_orig(tmp_neigh_node->addr, ethhdr->h_source) && (tmp_neigh_node->if_incoming == if_incoming)) orig_node->last_real_seqno,
bit_get_packet(tmp_neigh_node->real_bits, batman_packet->seqno - orig_node->last_real_seqno, 1); 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 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) { if (!is_duplicate) {
...@@ -403,24 +480,33 @@ static char count_real_packets(struct ethhdr *ethhdr, struct batman_packet *batm ...@@ -403,24 +480,33 @@ static char count_real_packets(struct ethhdr *ethhdr, struct batman_packet *batm
return is_duplicate; 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 batman_if *batman_if;
struct orig_node *orig_neigh_node, *orig_node; 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 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; 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 * This might happen if a packet is padded (e.g. Ethernet has a
* minimum frame length of 64 byte) and the aggregation interprets * minimum frame length of 64 byte) and the aggregation interprets
* it as an additional length. * it as an additional length.
* *
* TODO: A more sane solution would be to have a bit in the batman_packet * TODO: A more sane solution would be to have a bit in the
* to detect whether the packet is the last packet in an aggregation. * batman_packet to detect whether the packet is the last
* Here we expect that the padding is always zero (or not 0x01) * packet in an aggregation. Here we expect that the padding
* is always zero (or not 0x01)
*/ */
if (batman_packet->packet_type != BAT_PACKET) if (batman_packet->packet_type != BAT_PACKET)
return; return;
...@@ -434,21 +520,29 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack ...@@ -434,21 +520,29 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack
has_directlink_flag = (batman_packet->flags & DIRECTLINK ? 1 : 0); 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) { list_for_each_entry_rcu(batman_if, &if_list, list) {
if (batman_if->if_active != IF_ACTIVE) if (batman_if->if_active != IF_ACTIVE)
continue; 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; 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; 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; is_my_oldorig = 1;
if (compare_orig(ethhdr->h_source, broadcastAddr)) if (compare_orig(ethhdr->h_source, broadcastAddr))
...@@ -456,12 +550,16 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack ...@@ -456,12 +550,16 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack
} }
if (batman_packet->version != COMPAT_VERSION) { 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; return;
} }
if (is_my_addr) { 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; return;
} }
...@@ -471,14 +569,24 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack ...@@ -471,14 +569,24 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack
} }
if (is_my_orig) { if (is_my_orig) {
TYPE_OF_WORD *word;
int offset;
orig_neigh_node = get_orig_node(ethhdr->h_source); orig_neigh_node = get_orig_node(ethhdr->h_source);
/* neighbour has to indicate direct link and it has to come via the corresponding interface */ /* neighbour has to indicate direct link and it has to
/* if received seqno equals last send seqno save new seqno for bidirectional check */ * come via the corresponding interface */
if (has_directlink_flag && compare_orig(if_incoming->net_dev->dev_addr, batman_packet->orig) && /* if received seqno equals last send seqno save new
(batman_packet->seqno - if_incoming_seqno + 2 == 0)) { * seqno for bidirectional check */
bit_mark((TYPE_OF_WORD *)&(orig_neigh_node->bcast_own[if_incoming->if_num * NUM_WORDS]), 0); if (has_directlink_flag &&
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])); 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"); bat_dbg(DBG_BATMAN, "Drop packet: originator packet from myself (via neighbour) \n");
...@@ -504,38 +612,50 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack ...@@ -504,38 +612,50 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack
return; return;
/* avoid temporary routing loops */ /* avoid temporary routing loops */
if ((orig_node->router) && (orig_node->router->orig_node->router) && if ((orig_node->router) &&
(compare_orig(orig_node->router->addr, batman_packet->prev_sender)) && (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(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); bat_dbg(DBG_BATMAN, "Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %s) \n", neigh_str);
return; return;
} }
/* if sender is a direct neighbor the sender mac equals originator mac */ /* if sender is a direct neighbor the sender mac equals
orig_neigh_node = (is_single_hop_neigh ? orig_node : get_orig_node(ethhdr->h_source)); * originator mac */
orig_neigh_node = (is_single_hop_neigh ?
orig_node : get_orig_node(ethhdr->h_source));
if (orig_neigh_node == NULL) if (orig_neigh_node == NULL)
return; return;
/* drop packet if sender is not a direct neighbor and if we don't route towards it */ /* drop packet if sender is not a direct neighbor and if we
if (!is_single_hop_neigh && (orig_neigh_node->router == NULL)) { * 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"); bat_dbg(DBG_BATMAN, "Drop packet: OGM via unknown neighbor!\n");
return; 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 */ /* update ranking if it is not a duplicate or has the same
if (is_bidirectional && (!is_duplicate || * seqno and similar ttl as the non-duplicate */
((orig_node->last_real_seqno == batman_packet->seqno) && if (is_bidirectional &&
(orig_node->last_ttl - 3 <= batman_packet->ttl)))) (!is_duplicate ||
update_orig(orig_node, ethhdr, batman_packet, if_incoming, hna_buff, hna_buff_len, 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) neighbour */
if (is_single_hop_neigh) { if (is_single_hop_neigh) {
/* mark direct link on incoming interface */ /* 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"); bat_dbg(DBG_BATMAN, "Forwarding packet: rebroadcast neighbour packet with direct link flag\n");
return; return;
...@@ -543,7 +663,8 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack ...@@ -543,7 +663,8 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack
/* multihop originator */ /* multihop originator */
if (!is_bidirectional) { 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; return;
} }
...@@ -552,65 +673,85 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack ...@@ -552,65 +673,85 @@ void receive_bat_packet(struct ethhdr *ethhdr, struct batman_packet *batman_pack
return; return;
} }
bat_dbg(DBG_BATMAN, "Forwarding packet: rebroadcast originator packet\n"); bat_dbg(DBG_BATMAN,
schedule_forward_packet(orig_node, ethhdr, batman_packet, 0, hna_buff_len, if_incoming); "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 list_head *list_pos, *list_pos_tmp;
struct hash_it_t *hashit = NULL; char neigh_str[ETH_STR_LEN], orig_str[ETH_STR_LEN];
struct orig_node *orig_node; struct neigh_node *neigh_node;
struct neigh_node *neigh_node, *best_neigh_node; bool neigh_purged = false;
char orig_str[ETH_STR_LEN], neigh_str[ETH_STR_LEN], neigh_purged;
spin_lock(&orig_hash_lock);
/* for all origins... */ *best_neigh_node = NULL;
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))) { /* 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);
bat_dbg(DBG_BATMAN, "Originator timeout: originator %s, last_valid %lu\n", orig_str, (orig_node->last_valid / HZ)); if (time_after(jiffies,
(neigh_node->last_valid +
((PURGE_TIMEOUT * HZ) / 1000)))) {
hash_remove_bucket(orig_hash, hashit); addr_to_string(neigh_str, neigh_node->addr);
free_orig_node(orig_node); bat_dbg(DBG_BATMAN, "Neighbour timeout: originator %s, neighbour: %s, last_valid %lu\n", orig_str, neigh_str, (neigh_node->last_valid / HZ));
neigh_purged = true;
list_del(list_pos);
kfree(neigh_node);
} else { } 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; static bool purge_orig_node(struct orig_node *orig_node)
neigh_purged = 0; {
struct neigh_node *best_neigh_node;
/* for all neighbours towards this originator ... */ char orig_str[ETH_STR_LEN];
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);
bat_dbg(DBG_BATMAN, "Neighbour timeout: originator %s, neighbour: %s, last_valid %lu\n", orig_str, neigh_str, (neigh_node->last_valid / HZ));
neigh_purged = 1; addr_to_string(orig_str, orig_node->orig);
list_del(list_pos);
kfree(neigh_node);
} else { if (time_after(jiffies,
(orig_node->last_valid +
((2 * PURGE_TIMEOUT * HZ) / 1000)))) {
if ((best_neigh_node == NULL) || (neigh_node->tq_avg > best_neigh_node->tq_avg)) bat_dbg(DBG_BATMAN,
best_neigh_node = neigh_node; "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;
}
}
} void purge_orig(struct work_struct *work)
{
struct hash_it_t *hashit = NULL;
struct orig_node *orig_node;
if (neigh_purged) spin_lock(&orig_hash_lock);
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); spin_unlock(&orig_hash_lock);
...@@ -618,7 +759,8 @@ void purge_orig(struct work_struct *work) ...@@ -618,7 +759,8 @@ void purge_orig(struct work_struct *work)
start_purge_timer(); 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 kvec iov;
struct msghdr msg; struct msghdr msg;
...@@ -631,367 +773,495 @@ static int receive_raw_packet(struct socket *raw_sock, unsigned char *packet_buf ...@@ -631,367 +773,495 @@ static int receive_raw_packet(struct socket *raw_sock, unsigned char *packet_buf
msg.msg_namelen = 0; msg.msg_namelen = 0;
msg.msg_control = NULL; 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)
{
/* 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 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; 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); /* add data to device queue */
atomic_set(&exit_cond, 0); if (icmp_packet->msg_type != ECHO_REQUEST) {
packet_buff = kmalloc(PACKBUFF_SIZE, GFP_KERNEL); bat_device_receive_packet(icmp_packet);
if (!packet_buff) { return;
printk(KERN_ERR "batman-adv:Could allocate memory for the packet buffer. :(\n");
return -1;
} }
while ((!kthread_should_stop()) && (!atomic_read(&exit_cond))) { /* answer echo request (ping) */
/* get routing information */
wait_event_interruptible(thread_wait, (atomic_read(&data_ready_cond) || atomic_read(&exit_cond))); 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);
}
atomic_set(&data_ready_cond, 0); spin_unlock(&orig_hash_lock);
return;
}
if (kthread_should_stop() || atomic_read(&exit_cond)) static void recv_icmp_ttl_exceeded(struct icmp_packet *icmp_packet,
break; 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;
/* we only want to safely traverse the list, hard-interfaces addr_to_string(src_str, icmp_packet->orig);
* won't be deleted anyway as long as this thread runs. */ addr_to_string(dst_str, icmp_packet->dst);
rcu_read_lock(); printk(KERN_WARNING "batman-adv:Warning - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str);
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)
printk(KERN_WARNING
"batman-adv: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); /* send TTL exceeded if packet is an echo request (traceroute) */
if (result <= 0) if (icmp_packet->msg_type != ECHO_REQUEST)
break; return;
if (result < sizeof(struct ethhdr) + 2) /* get routing information */
continue; 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);
ethhdr = (struct ethhdr *)packet_buff; }
batman_packet = (struct batman_packet *)(packet_buff + sizeof(struct ethhdr));
if (batman_packet->version != COMPAT_VERSION) { spin_unlock(&orig_hash_lock);
bat_dbg(DBG_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 */ static void recv_icmp_packet(struct ethhdr *ethhdr,
if (result < sizeof(struct ethhdr) + sizeof(struct batman_packet)) unsigned char *packet_buff,
continue; int result,
struct batman_if *batman_if)
{
struct icmp_packet *icmp_packet;
struct orig_node *orig_node;
spin_lock(&orig_hash_lock); /* packet with unicast indication but broadcast recipient */
receive_aggr_bat_packet(ethhdr, if (is_bcast(ethhdr->h_dest))
packet_buff + sizeof(struct ethhdr), return;
result - sizeof(struct ethhdr),
batman_if);
spin_unlock(&orig_hash_lock);
break; /* packet with broadcast sender address */
if (is_bcast(ethhdr->h_source))
return;
/* batman icmp packet */ /* not for me */
case BAT_ICMP: if (!is_my_mac(ethhdr->h_dest))
/* packet with unicast indication but broadcast recipient */ return;
if (is_bcast(ethhdr->h_dest))
continue;
/* packet with broadcast sender address */ /* drop packet if it has not necessary minimum size */
if (is_bcast(ethhdr->h_source)) if (result < sizeof(struct ethhdr) + sizeof(struct icmp_packet))
continue; return;
/* not for me */ icmp_packet = (struct icmp_packet *)
if (!is_my_mac(ethhdr->h_dest)) (packet_buff + sizeof(struct ethhdr));
continue;
/* drop packet if it has not necessary minimum size */ /* packet for me */
if (result < sizeof(struct ethhdr) + sizeof(struct icmp_packet)) if (is_my_mac(icmp_packet->dst))
continue; 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 */ /* get routing information */
if (icmp_packet->msg_type != ECHO_REQUEST) { spin_lock(&orig_hash_lock);
bat_device_receive_packet(icmp_packet); orig_node = ((struct orig_node *)
continue; hash_find(orig_hash, icmp_packet->dst));
}
/* answer echo request (ping) */ if ((orig_node != NULL) &&
/* get routing information */ (orig_node->batman_if != NULL) &&
spin_lock(&orig_hash_lock); (orig_node->router != NULL)) {
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)) { /* decrement ttl */
icmp_packet->ttl--;
memcpy(icmp_packet->dst, icmp_packet->orig, ETH_ALEN); /* route it */
memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN); send_raw_packet(packet_buff + sizeof(struct ethhdr),
icmp_packet->msg_type = ECHO_REPLY; result - sizeof(struct ethhdr),
icmp_packet->ttl = TTL; orig_node->batman_if,
orig_node->router->addr);
}
spin_unlock(&orig_hash_lock);
}
send_raw_packet(packet_buff + sizeof(struct ethhdr), static void recv_unicast_packet(struct ethhdr *ethhdr,
result - sizeof(struct ethhdr), unsigned char *packet_buff,
orig_node->batman_if, int result,
orig_node->router->addr); 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); /* packet with broadcast sender address */
continue; if (is_bcast(ethhdr->h_source))
return;
} /* not for me */
if (!is_my_mac(ethhdr->h_dest))
return;
/* TTL exceeded */ /* drop packet if it has not necessary minimum size */
if (icmp_packet->ttl < 2) { if (result < hdr_size)
return;
addr_to_string(src_str, icmp_packet->orig); unicast_packet = (struct unicast_packet *)
addr_to_string(dst_str, icmp_packet->dst); (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 */ /* TTL exceeded */
spin_lock(&orig_hash_lock); if (unicast_packet->ttl < 2) {
orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet->orig)); 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); /* get routing information */
memcpy(icmp_packet->orig, ethhdr->h_dest, ETH_ALEN); spin_lock(&orig_hash_lock);
icmp_packet->msg_type = TTL_EXCEEDED; orig_node = ((struct orig_node *)
icmp_packet->ttl = TTL; hash_find(orig_hash, unicast_packet->dest));
if ((orig_node != NULL) &&
(orig_node->batman_if != NULL) &&
(orig_node->router != NULL)) {
/* decrement ttl */
unicast_packet->ttl--;
/* route it */
send_raw_packet(packet_buff + sizeof(struct ethhdr),
result - sizeof(struct ethhdr),
orig_node->batman_if,
orig_node->router->addr);
}
spin_unlock(&orig_hash_lock);
}
send_raw_packet(packet_buff + sizeof(struct ethhdr),
result - sizeof(struct ethhdr),
orig_node->batman_if,
orig_node->router->addr);
} 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);
spin_unlock(&orig_hash_lock); /* packet with broadcast indication but unicast recipient */
continue; if (!is_bcast(ethhdr->h_dest))
return;
} /* packet with broadcast sender address */
if (is_bcast(ethhdr->h_source))
return;
/* get routing information */ /* drop packet if it has not necessary minimum size */
spin_lock(&orig_hash_lock); if (result < hdr_size)
orig_node = ((struct orig_node *)hash_find(orig_hash, icmp_packet->dst)); return;
if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { /* ignore broadcasts sent by myself */
if (is_my_mac(ethhdr->h_source))
return;
/* decrement ttl */ bcast_packet = (struct bcast_packet *)
icmp_packet->ttl--; (packet_buff + sizeof(struct ethhdr));
/* route it */ /* ignore broadcasts originated by myself */
send_raw_packet(packet_buff + sizeof(struct ethhdr), if (is_my_mac(bcast_packet->orig))
result - sizeof(struct ethhdr), return;
orig_node->batman_if,
orig_node->router->addr);
}
spin_unlock(&orig_hash_lock); spin_lock(&orig_hash_lock);
break; orig_node = ((struct orig_node *)
hash_find(orig_hash, bcast_packet->orig));
/* unicast packet */ if (orig_node == NULL) {
case BAT_UNICAST: spin_unlock(&orig_hash_lock);
/* packet with unicast indication but broadcast recipient */ return;
if (is_bcast(ethhdr->h_dest)) }
continue;
/* packet with broadcast sender address */ /* check flood history */
if (is_bcast(ethhdr->h_source)) if (get_bit_status(orig_node->bcast_bits,
continue; orig_node->last_bcast_seqno,
ntohs(bcast_packet->seqno))) {
spin_unlock(&orig_hash_lock);
return;
}
/* not for me */ /* mark broadcast in flood history */
if (!is_my_mac(ethhdr->h_dest)) if (bit_get_packet(orig_node->bcast_bits,
continue; ntohs(bcast_packet->seqno) -
orig_node->last_bcast_seqno, 1))
orig_node->last_bcast_seqno = ntohs(bcast_packet->seqno);
/* drop packet if it has not necessary minimum size */ spin_unlock(&orig_hash_lock);
if (result < sizeof(struct ethhdr) + sizeof(struct unicast_packet))
continue;
unicast_packet = (struct unicast_packet *)(packet_buff + sizeof(struct ethhdr)); /* broadcast for me */
interface_rx(soft_device, packet_buff + hdr_size, result - hdr_size);
/* packet for me */ /* rebroadcast packet */
if (is_my_mac(unicast_packet->dest)) { add_bcast_packet_to_list(packet_buff + sizeof(struct ethhdr),
result - sizeof(struct ethhdr));
}
interface_rx(soft_device, packet_buff + sizeof(struct ethhdr) + sizeof(struct unicast_packet), result - sizeof(struct ethhdr) - sizeof(struct unicast_packet)); static void recv_vis_packet(struct ethhdr *ethhdr,
continue; 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;
} /* drop if too short. */
if (result < hdr_size)
return;
/* TTL exceeded */ /* not for me */
if (unicast_packet->ttl < 2) { if (!is_my_mac(ethhdr->h_dest))
addr_to_string(src_str, ((struct ethhdr *)(unicast_packet + 1))->h_source); return;
addr_to_string(dst_str, unicast_packet->dest);
printk(KERN_WARNING "batman-adv:Warning - can't send packet from %s to %s: ttl exceeded\n", src_str, dst_str); vis_packet = (struct vis_packet *)(packet_buff + sizeof(struct ethhdr));
continue; vis_info_len = result - hdr_size;
}
/* get routing information */ /* ignore own packets */
spin_lock(&orig_hash_lock); if (is_my_mac(vis_packet->vis_orig))
orig_node = ((struct orig_node *)hash_find(orig_hash, unicast_packet->dest)); return;
if ((orig_node != NULL) && (orig_node->batman_if != NULL) && (orig_node->router != NULL)) { if (is_my_mac(vis_packet->sender_orig))
/* decrement ttl */ return;
unicast_packet->ttl--;
/* route it */ switch (vis_packet->vis_type) {
send_raw_packet(packet_buff + sizeof(struct ethhdr), case VIS_TYPE_SERVER_SYNC:
result - sizeof(struct ethhdr), receive_server_sync_packet(vis_packet, vis_info_len);
orig_node->batman_if, break;
orig_node->router->addr);
}
spin_unlock(&orig_hash_lock); case VIS_TYPE_CLIENT_UPDATE:
break; receive_client_update_packet(vis_packet, vis_info_len);
break;
/* broadcast packet */ default: /* ignore unknown packet */
case BAT_BCAST: break;
/* packet with broadcast indication but unicast recipient */ }
if (!is_bcast(ethhdr->h_dest)) }
continue;
/* packet with broadcast sender address */ static int recv_one_packet(struct batman_if *batman_if,
if (is_bcast(ethhdr->h_source)) unsigned char *packet_buff)
continue; {
int result;
struct ethhdr *ethhdr;
struct batman_packet *batman_packet;
/* drop packet if it has not necessary minimum size */ result = receive_raw_packet(batman_if->raw_sock, packet_buff,
if (result < sizeof(struct ethhdr) + sizeof(struct bcast_packet)) PACKBUFF_SIZE);
continue; if (result <= 0)
return result;
/* ignore broadcasts sent by myself */ if (result < sizeof(struct ethhdr) + 2)
if (is_my_mac(ethhdr->h_source)) return 0;
continue;
bcast_packet = (struct bcast_packet *)(packet_buff + sizeof(struct ethhdr)); ethhdr = (struct ethhdr *)packet_buff;
batman_packet = (struct batman_packet *)
(packet_buff + sizeof(struct ethhdr));
/* ignore broadcasts originated by myself */ if (batman_packet->version != COMPAT_VERSION) {
if (is_my_mac(bcast_packet->orig)) bat_dbg(DBG_BATMAN,
continue; "Drop packet: incompatible batman version (%i)\n",
batman_packet->version);
return 0;
}
spin_lock(&orig_hash_lock); switch (batman_packet->packet_type) {
orig_node = ((struct orig_node *)hash_find(orig_hash, bcast_packet->orig)); /* batman originator packet */
case BAT_PACKET:
recv_bat_packet(ethhdr, packet_buff, result, batman_if);
break;
/* batman icmp packet */
case BAT_ICMP:
recv_icmp_packet(ethhdr, packet_buff, result, batman_if);
break;
/* unicast packet */
case BAT_UNICAST:
recv_unicast_packet(ethhdr, packet_buff, result, batman_if);
break;
/* broadcast packet */
case BAT_BCAST:
recv_bcast_packet(ethhdr,
packet_buff, result, batman_if);
break;
/* vis packet */
case BAT_VIS:
recv_vis_packet(ethhdr, packet_buff, result);
break;
}
return 0;
}
if (orig_node == NULL) {
spin_unlock(&orig_hash_lock);
continue;
}
/* check flood history */ static int discard_one_packet(struct batman_if *batman_if,
if (get_bit_status(orig_node->bcast_bits, orig_node->last_bcast_seqno, ntohs(bcast_packet->seqno))) { unsigned char *packet_buff)
spin_unlock(&orig_hash_lock); {
continue; int result = -EAGAIN;
}
/* mark broadcast in flood history */ if (batman_if->if_active != IF_TO_BE_ACTIVATED) {
if (bit_get_packet(orig_node->bcast_bits, ntohs(bcast_packet->seqno) - orig_node->last_bcast_seqno, 1)) printk(KERN_WARNING
orig_node->last_bcast_seqno = ntohs(bcast_packet->seqno); "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;
}
spin_unlock(&orig_hash_lock);
/* broadcast for me */ static bool is_interface_active(struct batman_if *batman_if)
interface_rx(soft_device, packet_buff + sizeof(struct ethhdr) + sizeof(struct bcast_packet), result - sizeof(struct ethhdr) - sizeof(struct bcast_packet)); {
if (batman_if->if_active != IF_ACTIVE)
return false;
/* rebroadcast packet */ return true;
add_bcast_packet_to_list(packet_buff + sizeof(struct ethhdr), }
result - sizeof(struct ethhdr));
break; static void service_interface(struct batman_if *batman_if,
unsigned char *packet_buff)
/* vis packet */ {
case BAT_VIS: int result;
/* drop if too short. */
if (result < sizeof(struct ethhdr) + sizeof(struct vis_packet))
continue;
/* not for me */ do {
if (!is_my_mac(ethhdr->h_dest)) if (is_interface_active(batman_if))
continue; result = recv_one_packet(batman_if, packet_buff);
else
result = discard_one_packet(batman_if, packet_buff);
} while (result >= 0);
vis_packet = (struct vis_packet *)(packet_buff + sizeof(struct ethhdr)); /* we perform none blocking reads, so EAGAIN indicates there
vis_info_len = result - sizeof(struct ethhdr) - sizeof(struct vis_packet); are no more packets to read. Anything else is a real
error.*/
/* ignore own packets */ if ((result < 0) && (result != -EAGAIN))
if (is_my_mac(vis_packet->vis_orig)) printk(KERN_ERR "batman-adv:Could not receive packet from interface %s: %i\n", batman_if->dev, result);
continue; }
if (is_my_mac(vis_packet->sender_orig)) static void service_interfaces(unsigned char *packet_buffer)
continue; {
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();
}
switch (vis_packet->vis_type) {
case VIS_TYPE_SERVER_SYNC:
receive_server_sync_packet(vis_packet, vis_info_len);
break;
case VIS_TYPE_CLIENT_UPDATE: int packet_recv_thread(void *data)
receive_client_update_packet(vis_packet, vis_info_len); {
break; unsigned char *packet_buff;
default: /* ignore unknown packet */ atomic_set(&data_ready_cond, 0);
break; 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;
}
break; while ((!kthread_should_stop()) && (!atomic_read(&exit_cond))) {
}
} wait_event_interruptible(thread_wait,
(atomic_read(&data_ready_cond) ||
atomic_read(&exit_cond)));
if ((result < 0) && (result != -EAGAIN)) atomic_set(&data_ready_cond, 0);
printk(KERN_ERR "batman-adv:Could not receive packet from interface %s: %i\n", batman_if->dev, result);
/* lock for the next iteration */ if (kthread_should_stop() || atomic_read(&exit_cond))
rcu_read_lock(); break;
}
rcu_read_unlock();
service_interfaces(packet_buff);
} }
kfree(packet_buff); kfree(packet_buff);
/* do not exit until kthread_stop() is actually called, otherwise it will wait for us /* do not exit until kthread_stop() is actually called,
* forever. */ * otherwise it will wait for us forever. */
while (!kthread_should_stop()) while (!kthread_should_stop())
schedule(); schedule();
......
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