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replaced add/remove ds6-nbr with an nbr-module controlled update of lladdress to avoid loss of other state information

This commit is contained in:
Joakim Eriksson 2015-11-26 20:26:10 +01:00
parent 2e852f758b
commit e9e31e9fd1
3 changed files with 104 additions and 43 deletions
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77
core/net/ipv6/uip-nd6.c
View File

@ -136,7 +136,7 @@ static uip_ds6_prefix_t *prefix; /** Pointer to a prefix list entry */
/*------------------------------------------------------------------*/
/* Copy link-layer address from LLAO option to a word-aligned uip_lladdr_t */
static void
extract_lladdr_aligned(uip_lladdr_t *dest) {
extract_lladdr_from_llao_aligned(uip_lladdr_t *dest) {
if(dest != NULL && nd6_opt_llao != NULL) {
memcpy(dest, &nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], UIP_LLADDR_LEN);
}
@ -199,17 +199,29 @@ ns_input(void)
goto discard;
} else {
#endif /*UIP_CONF_IPV6_CHECKS */
uip_lladdr_t lladdr_aligned;
extract_lladdr_from_llao_aligned(&lladdr_aligned);
nbr = uip_ds6_nbr_lookup(&UIP_IP_BUF->srcipaddr);
if(nbr == NULL) {
<<<<<<< 2e852f758b3fbc18ad30ec75d8c62b5d5238e70a
uip_lladdr_t lladdr_aligned;
extract_lladdr_aligned(&lladdr_aligned);
uip_ds6_nbr_add(&UIP_IP_BUF->srcipaddr, &lladdr_aligned,
0, NBR_STALE, NBR_TABLE_REASON_IPV6_ND, NULL);
=======
uip_ds6_nbr_add(&UIP_IP_BUF->srcipaddr, &lladdr_aligned, 0, NBR_STALE);
>>>>>>> replaced add/remove ds6-nbr with an nbr-module controlled update of lladdress to avoid loss of other state information
} else {
uip_lladdr_t *lladdr = (uip_lladdr_t *)uip_ds6_nbr_get_ll(nbr);
const uip_lladdr_t *lladdr = uip_ds6_nbr_get_ll(nbr);
if(lladdr == NULL) {
goto discard;
}
if(memcmp(&nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET],
lladdr, UIP_LLADDR_LEN) != 0) {
memcpy(lladdr, &nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], UIP_LLADDR_LEN);
if(nbr_table_update_lladdr((const linkaddr_t *)lladdr, (const linkaddr_t *)&lladdr_aligned, 1) == 0) {
/* failed to update the lladdr */
goto discard;
}
nbr->state = NBR_STALE;
} else {
if(nbr->state == NBR_INCOMPLETE) {
@ -495,10 +507,12 @@ na_input(void)
if(nbr == NULL) {
goto discard;
}
lladdr = uip_ds6_nbr_get_ll(nbr);
if(lladdr == NULL) {
goto discard;
}
if(nd6_opt_llao != NULL) {
is_llchange = lladdr == NULL ||
is_llchange =
memcmp(&nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET], lladdr,
UIP_LLADDR_LEN);
}
@ -507,17 +521,13 @@ na_input(void)
if(nd6_opt_llao == NULL) {
goto discard;
}
extract_lladdr_aligned(&lladdr_aligned);
/* Remove this neighbor - since it has a NULL MAC address */
uip_ds6_nbr_rm(nbr);
/* Re-add this neighbor - now with a correct MAC address */
nbr = uip_ds6_nbr_add(&UIP_ND6_NA_BUF->tgtipaddr,
&lladdr_aligned,
is_router, NBR_STALE);
if(nbr == NULL) {
extract_lladdr_from_llao_aligned(&lladdr_aligned);
if(nbr_table_update_lladdr((const linkaddr_t *)lladdr, (const linkaddr_t *)&lladdr_aligned, 1) == 0) {
/* failed to update the lladdr */
goto discard;
}
if(is_solicited) {
nbr->state = NBR_REACHABLE;
nbr->nscount = 0;
@ -529,7 +539,7 @@ na_input(void)
nbr->state = NBR_STALE;
}
nbr->isrouter = is_router;
} else {
} else { /* NBR is not INCOMPLETE */
if(!is_override && is_llchange) {
if(nbr->state == NBR_REACHABLE) {
nbr->state = NBR_STALE;
@ -543,15 +553,9 @@ na_input(void)
if(is_override || !is_llchange || nd6_opt_llao == NULL) {
if(nd6_opt_llao != NULL && is_llchange) {
uip_lladdr_t lladdr_aligned;
extract_lladdr_aligned(&lladdr_aligned);
/* Remove this neighbor - since it has updated its MAC address */
uip_ds6_nbr_rm(nbr);
/* Re-add this neighbor - now with a correct (new) MAC address */
nbr = uip_ds6_nbr_add(&UIP_ND6_NA_BUF->tgtipaddr,
&lladdr_aligned,
is_router, NBR_STALE);
if(nbr == NULL) {
extract_lladdr_from_llao_aligned(&lladdr_aligned);
if(nbr_table_update_lladdr((const linkaddr_t *) lladdr, (const linkaddr_t *) &lladdr_aligned, 1) == 0) {
/* failed to update the lladdr */
goto discard;
}
}
@ -652,15 +656,19 @@ rs_input(void)
} else {
#endif /*UIP_CONF_IPV6_CHECKS */
uip_lladdr_t lladdr_aligned;
extract_lladdr_aligned(&lladdr_aligned);
extract_lladdr_from_llao_aligned(&lladdr_aligned);
if((nbr = uip_ds6_nbr_lookup(&UIP_IP_BUF->srcipaddr)) == NULL) {
/* we need to add the neighbor */
uip_ds6_nbr_add(&UIP_IP_BUF->srcipaddr, &lladdr_aligned,
0, NBR_STALE, NBR_TABLE_REASON_IPV6_ND, NULL);
} else {
/* If LL address changed, set neighbor state to stale */
const uip_lladdr_t *lladdr = uip_ds6_nbr_get_ll(nbr);
if(lladdr == NULL) {
goto discard;
}
if(memcmp(&nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET],
uip_ds6_nbr_get_ll(nbr), UIP_LLADDR_LEN) != 0) {
lladdr, UIP_LLADDR_LEN) != 0) {
uip_ds6_nbr_t nbr_data = *nbr;
uip_ds6_nbr_rm(nbr);
nbr = uip_ds6_nbr_add(&UIP_IP_BUF->srcipaddr, &lladdr_aligned,
@ -892,18 +900,31 @@ ra_input(void)
nbr = uip_ds6_nbr_lookup(&UIP_IP_BUF->srcipaddr);
if(nbr == NULL) {
uip_lladdr_t lladdr_aligned;
<<<<<<< 2e852f758b3fbc18ad30ec75d8c62b5d5238e70a
extract_lladdr_aligned(&lladdr_aligned);
nbr = uip_ds6_nbr_add(&UIP_IP_BUF->srcipaddr, &lladdr_aligned,
1, NBR_STALE, NBR_TABLE_REASON_IPV6_ND, NULL);
=======
extract_lladdr_from_llao_aligned(&lladdr_aligned);
nbr = uip_ds6_nbr_add(&UIP_IP_BUF->srcipaddr, &lladdr_aligned, 1, NBR_STALE);
>>>>>>> replaced add/remove ds6-nbr with an nbr-module controlled update of lladdress to avoid loss of other state information
} else {
uip_lladdr_t *lladdr = (uip_lladdr_t *)uip_ds6_nbr_get_ll(nbr);
uip_lladdr_t lladdr_aligned;
extract_lladdr_from_llao_aligned(&lladdr_aligned);
const uip_lladdr_t *lladdr = uip_ds6_nbr_get_ll(nbr);
if(lladdr == NULL) {
goto discard;
}
if(nbr->state == NBR_INCOMPLETE) {
nbr->state = NBR_STALE;
}
if(memcmp(&nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET],
lladdr, UIP_LLADDR_LEN) != 0) {
memcpy(lladdr, &nd6_opt_llao[UIP_ND6_OPT_DATA_OFFSET],
UIP_LLADDR_LEN);
/* change of link layer address */
if(nbr_table_update_lladdr((const linkaddr_t *)lladdr, (const linkaddr_t *)&lladdr_aligned, 1) == 0) {
/* failed to update the lladdr */
goto discard;
}
nbr->state = NBR_STALE;
}
nbr->isrouter = 1;

69
core/net/nbr-table.c
View File

@ -178,6 +178,26 @@ nbr_set_bit(uint8_t *bitmap, nbr_table_t *table, nbr_table_item_t *item, int val
return 0;
}
/*---------------------------------------------------------------------------*/
static void
remove_key(nbr_table_key_t *least_used_key)
{
int i;
for(i = 0; i < MAX_NUM_TABLES; i++) {
if(all_tables[i] != NULL && all_tables[i]->callback != NULL) {
/* Call table callback for each table that uses this item */
nbr_table_item_t *removed_item = item_from_key(all_tables[i], least_used_key);
if(nbr_get_bit(used_map, all_tables[i], removed_item) == 1) {
all_tables[i]->callback(removed_item);
}
}
}
/* Empty used map */
used_map[index_from_key(least_used_key)] = 0;
/* Remove neighbor from list */
list_remove(nbr_table_keys, least_used_key);
/* Return associated key */
}
static nbr_table_key_t *
nbr_table_allocate(nbr_table_reason_t reason, void *data)
{
@ -253,21 +273,7 @@ nbr_table_allocate(nbr_table_reason_t reason, void *data)
return NULL;
} else {
/* Reuse least used item */
int i;
for(i = 0; i<MAX_NUM_TABLES; i++) {
if(all_tables[i] != NULL && all_tables[i]->callback != NULL) {
/* Call table callback for each table that uses this item */
nbr_table_item_t *removed_item = item_from_key(all_tables[i], least_used_key);
if(nbr_get_bit(used_map, all_tables[i], removed_item) == 1) {
all_tables[i]->callback(removed_item);
}
}
}
/* Empty used map */
used_map[index_from_key(least_used_key)] = 0;
/* Remove neighbor from list */
list_remove(nbr_table_keys, least_used_key);
/* Return associated key */
remove_key(least_used_key);
return least_used_key;
}
}
@ -416,6 +422,39 @@ nbr_table_get_lladdr(nbr_table_t *table, const void *item)
return key != NULL ? &key->lladdr : NULL;
}
/*---------------------------------------------------------------------------*/
/* Update link-layer address of an item */
int
nbr_table_update_lladdr(const linkaddr_t *old_addr, const linkaddr_t *new_addr,
int remove_if_duplicate)
{
int index;
int new_index;
nbr_table_key_t *key;
index = index_from_lladdr(old_addr);
if(index == -1) {
/* Failure to change since there is nothing to change. */
return 0;
}
if((new_index = index_from_lladdr(new_addr)) != -1) {
/* check if it is a change or not - do not remove / fail if same */
if(new_index == index) {
return 1;
}
/* This new entry already exists - failure! - remove if requested. */
if(remove_if_duplicate) {
remove_key(key_from_index(index));
}
return 0;
}
key = key_from_index(index);
/**
* Copy the new lladdr into the key - since we know that there is no
* conflicting entry.
*/
memcpy(&key->lladdr, new_addr, sizeof(linkaddr_t));
return 1;
}
/*---------------------------------------------------------------------------*/
#if DEBUG
static void
print_table()

1
core/net/nbr-table.h
View File

@ -109,6 +109,7 @@ int nbr_table_unlock(nbr_table_t *table, nbr_table_item_t *item);
/** \name Neighbor tables: address manipulation */
/** @{ */
linkaddr_t *nbr_table_get_lladdr(nbr_table_t *table, const nbr_table_item_t *item);
int nbr_table_update_lladdr(const linkaddr_t *old_addr, const linkaddr_t *new_addr, int remove_if_duplicate);
/** @} */
#endif /* NBR_TABLE_H_ */