/*---------------------------------------------------------------------------*/
void
akes_broadcast_hello(void)
{
uint8_t *payload;
if(is_awaiting_helloacks) {
PRINTF("akes: Still waiting for HELLOACKs\n");
return;
}
if(leaky_bucket_is_full(&hello_bucket)) {
PRINTF("akes: HELLO bucket is full\n");
return;
}
leaky_bucket_pour(&hello_bucket);
payload = adaptivesec_prepare_command(AKES_HELLO_IDENTIFIER, &linkaddr_null);
adaptivesec_add_security_header(NULL);
anti_replay_suppress_counter();
/* write payload */
akes_nbr_copy_challenge(payload, hello_challenge);
payload += AKES_NBR_CHALLENGE_LEN;
packetbuf_set_datalen(1 /* command frame identifier */
+ AKES_NBR_CHALLENGE_LEN); /* challenge */
PRINTF("akes: broadcasting HELLO\n");
ADAPTIVESEC_STRATEGY.send(on_hello_sent, NULL);
}
/*---------------------------------------------------------------------------*/
void
adaptivesec_add_security_header(struct anti_replay_info *receiver_info)
{
if(!anti_replay_set_counter(receiver_info)) {
watchdog_reboot();
}
#if ANTI_REPLAY_WITH_SUPPRESSION
anti_replay_suppress_counter();
#else /* ANTI_REPLAY_WITH_SUPPRESSION */
packetbuf_set_attr(PACKETBUF_ATTR_SECURITY_LEVEL, adaptivesec_get_sec_lvl());
#endif /* ANTI_REPLAY_WITH_SUPPRESSION */
}
/*---------------------------------------------------------------------------*/
static void
prepare_update_command(uint8_t cmd_id,
struct akes_nbr_entry *entry,
enum akes_nbr_status status)
{
uint8_t *payload;
uint8_t payload_len;
payload = adaptivesec_prepare_command(cmd_id, akes_nbr_get_addr(entry));
adaptivesec_add_security_header(entry->refs[status]);
anti_replay_suppress_counter();
if(status) {
/* avoids that csma.c confuses frames for tentative and permanent neighbors */
packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO,
0xff00 + packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO));
}
#if ANTI_REPLAY_WITH_SUPPRESSION
packetbuf_set_attr(PACKETBUF_ATTR_NEIGHBOR_INDEX, akes_nbr_index_of(entry->refs[status]));
#endif /* ANTI_REPLAY_WITH_SUPPRESSION */
switch(cmd_id) {
case AKES_HELLOACK_IDENTIFIER:
case AKES_HELLOACK_P_IDENTIFIER:
case AKES_ACK_IDENTIFIER:
packetbuf_set_attr(PACKETBUF_ATTR_MAX_MAC_TRANSMISSIONS,
MAX_RETRANSMISSIONS_OF_HELLOACKS_AND_ACKS + 1);
break;
default:
break;
}
/* write payload */
if(status) {
akes_nbr_copy_challenge(payload, entry->tentative->challenge);
payload += AKES_NBR_CHALLENGE_LEN;
}
#if AKES_NBR_WITH_INDICES
payload[0] = akes_nbr_index_of(entry->refs[status]);
payload++;
#endif /* AKES_NBR_WITH_INDICES */
#if ANTI_REPLAY_WITH_SUPPRESSION
{
frame802154_frame_counter_t reordered_counter;
anti_replay_write_counter(payload);
payload += 4;
reordered_counter.u32 = LLSEC802154_HTONL(anti_replay_my_broadcast_counter);
memcpy(payload, reordered_counter.u8, 4);
payload += 4;
}
#endif /* ANTI_REPLAY_WITH_SUPPRESSION */
payload_len = payload - ((uint8_t *)packetbuf_hdrptr());
#if AKES_NBR_WITH_GROUP_KEYS
switch(cmd_id) {
case AKES_HELLOACK_IDENTIFIER:
case AKES_HELLOACK_P_IDENTIFIER:
case AKES_ACK_IDENTIFIER:
akes_nbr_copy_key(payload, adaptivesec_group_key);
packetbuf_set_attr(PACKETBUF_ATTR_UNENCRYPTED_BYTES, payload_len);
payload_len += AES_128_KEY_LENGTH;
break;
}
#endif /* AKES_NBR_WITH_GROUP_KEYS */
packetbuf_set_datalen(payload_len);
}
