void *pkt_fill_mapping_record(
lispd_pkt_mapping_record_t *rec,
lispd_mapping_elt *mapping,
lisp_addr_t *probed_rloc)
{
int cpy_len = 0;
lispd_pkt_mapping_record_locator_t *loc_ptr = NULL;
lispd_locators_list *locators_list[2] = {NULL,NULL};
lispd_locator_elt *locator = NULL;
int ctr = 0;
if ((rec == NULL) || (mapping == NULL))
return NULL;
rec->ttl = htonl(DEFAULT_MAP_REGISTER_TIMEOUT);
rec->locator_count = mapping->locator_count;
rec->eid_prefix_length = mapping->eid_prefix_length;
rec->action = 0;
rec->authoritative = 1;
rec->version_hi = 0;
rec->version_low = 0;
loc_ptr = (lispd_pkt_mapping_record_locator_t *)pkt_fill_eid(&(rec->eid_prefix_afi), mapping);
if (loc_ptr == NULL){
return NULL;
}
locators_list[0] = mapping->head_v4_locators_list;
locators_list[1] = mapping->head_v6_locators_list;
for (ctr = 0 ; ctr < 2 ; ctr++){
while (locators_list[ctr]) {
locator = locators_list[ctr]->locator;
loc_ptr->priority = locator->priority;
loc_ptr->weight = locator->weight;
loc_ptr->mpriority = locator->mpriority;
loc_ptr->mweight = locator->mweight;
loc_ptr->local = 1;
if (probed_rloc != NULL && compare_lisp_addr_t(locator->locator_addr,probed_rloc)==0){
loc_ptr->probed = 1;
}
loc_ptr->reachable = *(locator->state);
loc_ptr->locator_afi = htons(get_lisp_afi(locator->locator_addr->afi,NULL));
if ((cpy_len = copy_addr((void *) CO(loc_ptr,
sizeof(lispd_pkt_mapping_record_locator_t)), locator->locator_addr, 0)) == 0) {
LISPD_LOG(LISP_LOG_DEBUG_3, "copy_addr failed for locator %s",
get_char_from_lisp_addr_t(*(locator->locator_addr)));
return(NULL);
}
loc_ptr = (lispd_pkt_mapping_record_locator_t *)
CO(loc_ptr, (sizeof(lispd_pkt_mapping_record_locator_t) + cpy_len));
locators_list[ctr] = locators_list[ctr]->next;
}
}
return (void *)loc_ptr;
}
void *pkt_fill_eid(
void *offset,
lispd_mapping_elt *mapping)
{
uint16_t *afi_ptr;
lispd_pkt_lcaf_t *lcaf_ptr;
lispd_pkt_lcaf_iid_t *iid_ptr;
void *eid_ptr;
int eid_addr_len;
afi_ptr = (uint16_t *)offset;
eid_addr_len = get_addr_len(mapping->eid_prefix.afi);
/* For negative IID values, we skip LCAF/IID field */
if (mapping->iid < 0) {
*afi_ptr = htons(get_lisp_afi(mapping->eid_prefix.afi, NULL));
eid_ptr = CO(offset, sizeof(uint16_t));
} else {
*afi_ptr = htons(LISP_AFI_LCAF);
lcaf_ptr = (lispd_pkt_lcaf_t *) CO(offset, sizeof(uint16_t));
iid_ptr = (lispd_pkt_lcaf_iid_t *) CO(lcaf_ptr, sizeof(lispd_pkt_lcaf_t));
eid_ptr = (void *) CO(iid_ptr, sizeof(lispd_pkt_lcaf_iid_t));
lcaf_ptr->rsvd1 = 0;
lcaf_ptr->flags = 0;
lcaf_ptr->type = 2;
lcaf_ptr->rsvd2 = 0; /* This can be IID mask-len, not yet supported */
lcaf_ptr->len = htons(sizeof(lispd_pkt_lcaf_iid_t) + eid_addr_len);
iid_ptr->iid = htonl(mapping->iid);
iid_ptr->afi = htons(mapping->eid_prefix.afi);
}
if ((copy_addr(eid_ptr,&(mapping->eid_prefix), 0)) == 0) {
LISPD_LOG(LISP_LOG_DEBUG_3, "copy_addr failed");
return NULL;
}
return CO(eid_ptr, eid_addr_len);
}
/*
* build_map_reply()
*
* Create the response packet given a locator chain and
* destination address.
*/
lispd_pkt_map_reply_t *build_map_reply(uint32_t probe_source, int probe,
lispd_locator_chain_t *loc_chain,
char *nonce,
int *len)
{
lispd_pkt_map_reply_t *reply_pkt;
lispd_pkt_map_reply_eid_prefix_record_t *eid_rec;
lispd_pkt_map_reply_locator_record_t *loc_rec;
lisp_addr_t loc_addr;
lispd_locator_chain_elt_t *locator_chain_elt;
lispd_if_t *intf;
uint32_t total_loc_length = 0;
uint32_t eid_afi = 0;
uint32_t pkt_length = 0;
uint32_t addr_len = 0;
uint32_t afi_len = 0;
uint32_t loc_count = 0;
uint32_t loc_afi = 0;
/*
* Like in map registers, assume one record with
* several locators.
*/
locator_chain_elt = loc_chain->head;
total_loc_length = get_locator_length_and_count(locator_chain_elt, &loc_count);
eid_afi = get_lisp_afi(loc_chain->eid_prefix.afi, &afi_len);
pkt_length = sizeof(lispd_pkt_map_reply_t) +
sizeof(lispd_pkt_map_reply_eid_prefix_record_t) + // XXX Just one for now
afi_len +
(loc_count *
sizeof(lispd_pkt_map_reply_locator_record_t)) +
total_loc_length;
if ((reply_pkt = (lispd_pkt_map_reply_t *)malloc(pkt_length)) == NULL) {
log_msg(INFO, "malloc (map-reply packet): %s", strerror(errno));
return NULL;
}
memset(reply_pkt, 0, pkt_length);
reply_pkt->type = LISP_MAP_REPLY;
reply_pkt->probe = probe;
reply_pkt->echononce = 0;
reply_pkt->count = 1;
memcpy(&reply_pkt->nonce, nonce, sizeof(uint64_t));
eid_rec = (lispd_pkt_map_reply_eid_prefix_record_t *)CO(reply_pkt,
sizeof(lispd_pkt_map_reply_t));
eid_rec->act = 0;
eid_rec->authoritative = 1;
eid_rec->loc_count = loc_count;
eid_rec->eid_afi = htons(eid_afi);
eid_rec->eid_masklen = loc_chain->eid_prefix_length;
eid_rec->ttl = htonl(DEFAULT_MAP_REGISTER_TIMEOUT); // Should be different for Map-replies?
eid_rec->version = 0;
/*
* Advance to the prefix
*/
if ((addr_len = copy_addr((void *)CO(eid_rec, sizeof(lispd_pkt_map_reply_eid_prefix_record_t)),
&(loc_chain->eid_prefix),
loc_chain->eid_prefix.afi,
0)) == 0) {
log_msg(INFO, "eid prefix (%s) has an unknown afi (%d)",
loc_chain->eid_name,
loc_chain->eid_prefix.afi);
return NULL;
}
/*
* skip over the fixed part and eid prefix, and build
* the locators
*/
loc_rec = (lispd_pkt_map_reply_locator_record_t *)
CO(eid_rec,(sizeof(lispd_pkt_mapping_record_t) + addr_len));
while (locator_chain_elt) {
intf = locator_chain_elt->interface;
/*
* Check interface status and get the address
*/
if (intf && (intf->flags & IFF_UP)) {
if (intf->nat_type != NATOff) {
if (is_nat_complete(intf)) { // Skip untranslated NAT interfaces
memcpy(&loc_addr, &intf->nat_address.address.ip.s_addr, sizeof(lisp_addr_t));
} else {
locator_chain_elt = locator_chain_elt->next;
continue;
}
} else if (intf->address.address.ip.s_addr != 0) { // IPV4 only and local interface only XXX
memcpy(&loc_addr, &intf->address, sizeof(lisp_addr_t));
} else {
locator_chain_elt = locator_chain_elt->next;
continue; // No address? Not included.
}
} else {
locator_chain_elt = locator_chain_elt->next;
continue;
} // Need to handle non-local locators XXX
loc_rec->priority = locator_chain_elt->priority;
loc_rec->weight = locator_chain_elt->weight;
loc_rec->mpriority = locator_chain_elt->mpriority;
loc_rec->mweight = locator_chain_elt->mweight;
loc_rec->reachable = 1;
loc_rec->probe = probe;
loc_rec->local = 1;
if (intf) {
loc_afi = intf->address.afi;
} else {
loc_afi = locator_chain_elt->locator_afi;
}
loc_rec->loc_afi = htons(get_lisp_afi(loc_afi, NULL));
/*
* skip over the mapping record locator, and copy the locator
* to that address...
*/
if ((addr_len = copy_addr((void *)
CO(loc_rec,
sizeof(lispd_pkt_map_reply_locator_record_t)),
&(loc_addr),
loc_afi,
0)) == 0) {
log_msg(INFO, "locator (%s) has an unknown afi (%d)",
locator_chain_elt->locator_name,
locator_chain_elt->locator_afi);
return NULL;
}
/*
* get the next locator in the chain and wind
* loc_rec to the right place
*/
loc_rec = (lispd_pkt_map_reply_locator_record_t *)
CO(loc_rec, (sizeof(lispd_pkt_map_reply_locator_record_t) + addr_len));
locator_chain_elt = locator_chain_elt->next;
}
*len = pkt_length;
return reply_pkt;
}
uint8_t *build_map_request_pkt(
lispd_mapping_elt *requested_mapping,
lisp_addr_t *src_eid,
uint8_t encap,
uint8_t probe,
uint8_t solicit_map_request,/* boolean really */
uint8_t smr_invoked,
int *len, /* return length here */
uint64_t *nonce) /* return nonce here */
{
uint8_t *packet = NULL;
uint8_t *mr_packet = NULL;
lispd_pkt_map_request_t *mrp = NULL;
lispd_pkt_mapping_record_t *rec = NULL;
lispd_pkt_map_request_itr_rloc_t *itr_rloc = NULL;
lispd_pkt_map_request_eid_prefix_record_t *request_eid_record = NULL;
uint8_t *cur_ptr = NULL;
int map_request_msg_len = 0;
int ctr = 0;
int cpy_len = 0;
int locators_ctr = 0;
lispd_mapping_elt *src_mapping = NULL;
lispd_locators_list *locators_list[2] = {NULL,NULL};
lispd_locator_elt *locator = NULL;
lisp_addr_t *ih_src_ip = NULL;
/*
* Lookup the local EID prefix from where we generate the message.
* src_eid is null for RLOC probing and refreshing map_cache -> Source-EID AFI = 0
*/
if (src_eid != NULL){
src_mapping = lookup_eid_in_db(*src_eid);
if (!src_mapping){
lispd_log_msg(LISP_LOG_DEBUG_2,"build_map_request_pkt: Source EID address not found in local data base - %s -",
get_char_from_lisp_addr_t(*src_eid));
return (NULL);
}
}
/* Calculate the packet size and reserve memory */
map_request_msg_len = get_map_request_length(requested_mapping,src_mapping);
*len = map_request_msg_len;
if ((packet = malloc(map_request_msg_len)) == NULL){
lispd_log_msg(LISP_LOG_WARNING,"build_map_request_pkt: Unable to allocate memory for Map Request (packet_len): %s", strerror(errno));
return (NULL);
}
memset(packet, 0, map_request_msg_len);
cur_ptr = packet;
mrp = (lispd_pkt_map_request_t *)cur_ptr;
mrp->type = LISP_MAP_REQUEST;
mrp->authoritative = 0;
if (src_eid != NULL)
mrp->map_data_present = 1;
else
mrp->map_data_present = 0;
if (probe)
mrp->rloc_probe = 1;
else
mrp->rloc_probe = 0;
if (solicit_map_request)
mrp->solicit_map_request = 1;
else
mrp->solicit_map_request = 0;
if (smr_invoked)
mrp->smr_invoked = 1;
else
mrp->smr_invoked = 0;
mrp->additional_itr_rloc_count = 0; /* To be filled later */
mrp->record_count = 1; /* XXX: assume 1 record */
mrp->nonce = build_nonce((unsigned int) time(NULL));
*nonce = mrp->nonce;
if (src_eid != NULL){
cur_ptr = pkt_fill_eid(&(mrp->source_eid_afi),src_mapping);
/* Add itr-rlocs */
locators_list[0] = src_mapping->head_v4_locators_list;
locators_list[1] = src_mapping->head_v6_locators_list;
for (ctr=0 ; ctr < 2 ; ctr++){
while (locators_list[ctr]){
locator = locators_list[ctr]->locator;
if (*(locator->state)==DOWN){
locators_list[ctr] = locators_list[ctr]->next;
continue;
}
/* Remove ITR locators behind NAT: No control message (4342) can be received in these interfaces */
if (((lcl_locator_extended_info *)locator->extended_info)->rtr_locators_list != NULL){
locators_list[ctr] = locators_list[ctr]->next;
continue;
}
itr_rloc = (lispd_pkt_map_request_itr_rloc_t *)cur_ptr;
itr_rloc->afi = htons(get_lisp_afi(locator->locator_addr->afi,NULL));
/* Add rloc address */
cur_ptr = CO(itr_rloc,sizeof(lispd_pkt_map_request_itr_rloc_t));
cpy_len = copy_addr((void *) cur_ptr ,locator->locator_addr, 0);
cur_ptr = CO(cur_ptr, cpy_len);
locators_ctr ++;
locators_list[ctr] = locators_list[ctr]->next;
}
}
}else {
// XXX If no source EID is used, then we only use one ITR-RLOC for IPv4 and one for IPv6-> Default control RLOC
mrp->source_eid_afi = 0;
cur_ptr = CO(mrp, sizeof(lispd_pkt_map_request_t));
if (default_ctrl_iface_v4 != NULL){
itr_rloc = (lispd_pkt_map_request_itr_rloc_t *)cur_ptr;
itr_rloc->afi = htons((uint16_t)LISP_AFI_IP);
cur_ptr = CO(itr_rloc,sizeof(lispd_pkt_map_request_itr_rloc_t));
cpy_len = copy_addr((void *) cur_ptr ,default_ctrl_iface_v4->ipv4_address, 0);
cur_ptr = CO(cur_ptr, cpy_len);
locators_ctr ++;
}
if (default_ctrl_iface_v6 != NULL){
itr_rloc = (lispd_pkt_map_request_itr_rloc_t *)cur_ptr;
itr_rloc->afi = htons(get_lisp_afi(AF_INET6,NULL));
cur_ptr = CO(itr_rloc,sizeof(lispd_pkt_map_request_itr_rloc_t));
cpy_len = copy_addr((void *) cur_ptr ,default_ctrl_iface_v6->ipv6_address, 0);
cur_ptr = CO(cur_ptr, cpy_len);
locators_ctr ++;
}
}
mrp->additional_itr_rloc_count = locators_ctr - 1; /* IRC = 0 --> 1 ITR-RLOC */
if (locators_ctr == 0){
lispd_log_msg(LISP_LOG_DEBUG_2,"build_map_request_pkt: No ITR RLOCs.");
free(packet);
return (NULL);
}
/* Requested EID record */
request_eid_record = (lispd_pkt_map_request_eid_prefix_record_t *)cur_ptr;
request_eid_record->eid_prefix_length = requested_mapping->eid_prefix_length;
cur_ptr = pkt_fill_eid(&(request_eid_record->eid_prefix_afi),requested_mapping);
if (mrp->map_data_present == 1){
/* Map-Reply Record */
rec = (lispd_pkt_mapping_record_t *)cur_ptr;
if ((pkt_fill_mapping_record(rec, src_mapping, NULL))== NULL) {
lispd_log_msg(LISP_LOG_DEBUG_2,"build_map_request_pkt: Couldn't buil map reply record for map request. "
"Map Request will not be send");
free(packet);
return(NULL);
}
}
/* Add Encapsulated (Inner) control header*/
if (encap){
/*
* If no source EID is included (Source-EID-AFI = 0), The default RLOC address is used for
* the source address in the inner IP header
*/
if (src_eid != NULL){
ih_src_ip = &(src_mapping->eid_prefix);;
}else{
if (requested_mapping->eid_prefix.afi == AF_INET){
ih_src_ip = get_main_eid (AF_INET);
}else{
ih_src_ip = get_main_eid (AF_INET6);
}
}
mr_packet = packet;
packet = build_control_encap_pkt(mr_packet, map_request_msg_len, ih_src_ip, &(requested_mapping->eid_prefix), LISP_CONTROL_PORT, LISP_CONTROL_PORT, len);
if (packet == NULL){
lispd_log_msg(LISP_LOG_DEBUG_1,"build_map_request_pkt: Couldn't encapsulate the map request");
free (mr_packet);
return (NULL);
}
}
return (packet);
}
uint8_t *pkt_fill_mapping_record(
lispd_pkt_mapping_record_t *rec,
lispd_mapping_elt *mapping,
lisp_addr_t *probed_rloc)
{
uint8_t *cur_ptr = NULL;
int cpy_len = 0;
lispd_pkt_mapping_record_locator_t *loc_ptr = NULL;
lispd_locators_list *locators_list[2] = {NULL,NULL};
lispd_locator_elt *locator = NULL;
lcl_locator_extended_info *lct_extended_info = NULL;
lisp_addr_t *itr_address = NULL;
int ctr = 0;
if ((rec == NULL) || (mapping == NULL)){
return NULL;
}
rec->ttl = htonl(DEFAULT_MAP_REGISTER_TIMEOUT);
rec->locator_count = mapping->locator_count;
rec->eid_prefix_length = mapping->eid_prefix_length;
rec->action = 0;
rec->authoritative = 1;
rec->version_hi = 0;
rec->version_low = 0;
cur_ptr = (uint8_t *)&(rec->eid_prefix_afi);
cur_ptr = pkt_fill_eid(cur_ptr, mapping);
loc_ptr = (lispd_pkt_mapping_record_locator_t *)cur_ptr;
if (loc_ptr == NULL){
return NULL;
}
locators_list[0] = mapping->head_v4_locators_list;
locators_list[1] = mapping->head_v6_locators_list;
for (ctr = 0 ; ctr < 2 ; ctr++){
while (locators_list[ctr]) {
locator = locators_list[ctr]->locator;
if (*(locator->state) == UP){
loc_ptr->priority = locator->priority;
}else{
/* If the locator is DOWN, set the priority to 255 -> Locator should not be used */
loc_ptr->priority = UNUSED_RLOC_PRIORITY;
}
loc_ptr->weight = locator->weight;
loc_ptr->mpriority = locator->mpriority;
loc_ptr->mweight = locator->mweight;
loc_ptr->local = 1;
if (probed_rloc != NULL && compare_lisp_addr_t(locator->locator_addr,probed_rloc)==0){
loc_ptr->probed = 1;
}
loc_ptr->reachable = *(locator->state);
loc_ptr->locator_afi = htons(get_lisp_afi(locator->locator_addr->afi,NULL));
lct_extended_info = (lcl_locator_extended_info *)(locator->extended_info);
if (lct_extended_info->rtr_locators_list != NULL){
itr_address = &(lct_extended_info->rtr_locators_list->locator->address);
}else{
itr_address = locator->locator_addr;
}
if ((cpy_len = copy_addr((void *) CO(loc_ptr,
sizeof(lispd_pkt_mapping_record_locator_t)), itr_address, 0)) == 0) {
lispd_log_msg(LISP_LOG_DEBUG_3, "pkt_fill_mapping_record: copy_addr failed for locator %s",
get_char_from_lisp_addr_t(*(locator->locator_addr)));
return(NULL);
}
loc_ptr = (lispd_pkt_mapping_record_locator_t *)
CO(loc_ptr, (sizeof(lispd_pkt_mapping_record_locator_t) + cpy_len));
locators_list[ctr] = locators_list[ctr]->next;
}
}
return ((void *)loc_ptr);
}
