void gnrc_rpl_send_DIS(gnrc_rpl_dodag_t *dodag, ipv6_addr_t *destination)
{
(void) dodag;
gnrc_pktsnip_t *pkt;
icmpv6_hdr_t *icmp;
gnrc_rpl_dis_t *dis;
/* TODO: Currently the DIS is too small so that wireshark complains about an incorrect
* ethernet frame check sequence. In order to prevent this, 4 PAD1 options are added.
* This will be addressed in follow-up PRs */
int size = sizeof(icmpv6_hdr_t) + sizeof(gnrc_rpl_dis_t) + 4;
if ((pkt = gnrc_icmpv6_build(NULL, ICMPV6_RPL_CTRL, GNRC_RPL_ICMPV6_CODE_DIS, size)) == NULL) {
DEBUG("RPL: Send DIS - no space left in packet buffer\n");
return;
}
icmp = (icmpv6_hdr_t *)pkt->data;
dis = (gnrc_rpl_dis_t *)(icmp + 1);
dis->flags = 0;
dis->reserved = 0;
/* TODO: see above TODO */
memset((dis + 1), 0, 4);
gnrc_rpl_send(pkt, NULL, destination, (dodag ? &dodag->dodag_id : NULL));
}
gnrc_pktsnip_t *gnrc_icmpv6_echo_build(uint8_t type, uint16_t id, uint16_t seq,
uint8_t *data, size_t data_len)
{
gnrc_pktsnip_t *pkt;
icmpv6_echo_t *echo;
if ((pkt = gnrc_icmpv6_build(NULL, type, 0, data_len + sizeof(icmpv6_echo_t))) == NULL) {
return NULL;
}
DEBUG("icmpv6_echo: Building echo message with type=%" PRIu8 "id=%" PRIu16
", seq=%" PRIu16, type, id, seq);
echo = (icmpv6_echo_t *)pkt->data;
echo->id = byteorder_htons(id);
echo->seq = byteorder_htons(seq);
if (data != NULL) {
memcpy(echo + 1, data, data_len);
#if defined(MODULE_OD) && ENABLE_DEBUG
DEBUG(", payload:\n");
od_hex_dump(data, data_len, OD_WIDTH_DEFAULT);
#endif
}
DEBUG("\n");
return pkt;
}
void gnrc_rpl_send_DIS(gnrc_rpl_instance_t *inst, ipv6_addr_t *destination)
{
gnrc_pktsnip_t *pkt;
icmpv6_hdr_t *icmp;
gnrc_rpl_dis_t *dis;
/* TODO: Currently the DIS is too small so that wireshark complains about an incorrect
* ethernet frame check sequence. In order to prevent this, 4 PAD1 options are added.
* This will be addressed in follow-up PRs */
uint8_t padding[] = {
0x01, 0x02, 0x00, 0x00
};
int size = sizeof(icmpv6_hdr_t) + sizeof(gnrc_rpl_dis_t) + sizeof(padding);
if ((pkt = gnrc_icmpv6_build(NULL, ICMPV6_RPL_CTRL, GNRC_RPL_ICMPV6_CODE_DIS, size)) == NULL) {
DEBUG("RPL: Send DIS - no space left in packet buffer\n");
return;
}
icmp = (icmpv6_hdr_t *)pkt->data;
dis = (gnrc_rpl_dis_t *)(icmp + 1);
dis->flags = 0;
dis->reserved = 0;
/* TODO add padding may be removed if packet size grows */
memcpy((dis + 1), padding, sizeof(padding));
gnrc_rpl_send(pkt, NULL, destination, (inst? &(inst->dodag.dodag_id) : NULL));
}
void gnrc_rpl_send_DIO(gnrc_rpl_instance_t *inst, ipv6_addr_t *destination)
{
if (inst == NULL) {
DEBUG("RPL: Error - trying to send DIO without being part of a dodag.\n");
return;
}
gnrc_rpl_dodag_t *dodag = &inst->dodag;
gnrc_pktsnip_t *pkt = NULL, *tmp = NULL;
gnrc_rpl_dio_t *dio;
#ifndef GNRC_RPL_WITHOUT_PIO
if (dodag->req_opts & GNRC_RPL_REQ_OPT_PREFIX_INFO) {
if ((pkt = _dio_prefix_info_build(pkt, dodag)) == NULL) {
return;
}
}
#endif
if (dodag->req_opts & GNRC_RPL_REQ_OPT_DODAG_CONF) {
if ((pkt = _dio_dodag_conf_build(pkt, dodag)) == NULL) {
return;
}
dodag->req_opts &= ~GNRC_RPL_REQ_OPT_DODAG_CONF;
}
if ((tmp = gnrc_pktbuf_add(pkt, NULL, sizeof(gnrc_rpl_dio_t), GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL: Send DIO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = tmp;
dio = pkt->data;
dio->instance_id = inst->id;
dio->version_number = dodag->version;
/* a leaf node announces an INFINITE_RANK */
dio->rank = ((dodag->node_status == GNRC_RPL_LEAF_NODE) ?
byteorder_htons(GNRC_RPL_INFINITE_RANK) : byteorder_htons(dodag->my_rank));
dio->g_mop_prf = (dodag->grounded << GNRC_RPL_GROUNDED_SHIFT) |
(inst->mop << GNRC_RPL_MOP_SHIFT) | dodag->prf;
dio->dtsn = dodag->dtsn;
dio->flags = 0;
dio->reserved = 0;
dio->dodag_id = dodag->dodag_id;
if ((tmp = gnrc_icmpv6_build(pkt, ICMPV6_RPL_CTRL, GNRC_RPL_ICMPV6_CODE_DIO,
sizeof(icmpv6_hdr_t))) == NULL) {
DEBUG("RPL: Send DIO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = tmp;
gnrc_rpl_send(pkt, NULL, destination, &dodag->dodag_id);
}
void gnrc_rpl_send_DIO(gnrc_rpl_dodag_t *dodag, ipv6_addr_t *destination)
{
if (dodag == NULL) {
DEBUG("RPL: Error - trying to send DIO without being part of a dodag.\n");
return;
}
gnrc_pktsnip_t *pkt;
icmpv6_hdr_t *icmp;
gnrc_rpl_dio_t *dio;
uint8_t *pos;
int size = sizeof(icmpv6_hdr_t) + sizeof(gnrc_rpl_dio_t);
if ((dodag->dodag_conf_counter % 3) == 0) {
size += sizeof(gnrc_rpl_opt_dodag_conf_t);
size += sizeof(gnrc_rpl_opt_prefix_info_t);
}
if ((pkt = gnrc_icmpv6_build(NULL, ICMPV6_RPL_CTRL, GNRC_RPL_ICMPV6_CODE_DIO, size)) == NULL) {
DEBUG("RPL: Send DIO - no space left in packet buffer\n");
return;
}
icmp = (icmpv6_hdr_t *)pkt->data;
dio = (gnrc_rpl_dio_t *)(icmp + 1);
pos = (uint8_t *) dio;
dio->instance_id = dodag->instance->id;
dio->version_number = dodag->version;
dio->rank = byteorder_htons(dodag->my_rank);
dio->g_mop_prf = (dodag->grounded << GNRC_RPL_GROUNDED_SHIFT) |
(dodag->instance->mop << GNRC_RPL_MOP_SHIFT) | dodag->prf;
dio->dtsn = dodag->dtsn;
dio->flags = 0;
dio->reserved = 0;
dio->dodag_id = dodag->dodag_id;
pos += sizeof(*dio);
if ((dodag->dodag_conf_counter % 3) == 0) {
gnrc_rpl_opt_dodag_conf_t *dodag_conf;
dodag_conf = (gnrc_rpl_opt_dodag_conf_t *) pos;
dodag_conf->type = GNRC_RPL_OPT_DODAG_CONF;
dodag_conf->length = GNRC_RPL_OPT_DODAG_CONF_LEN;
dodag_conf->flags_a_pcs = 0;
dodag_conf->dio_int_doubl = dodag->dio_interval_doubl;
dodag_conf->dio_int_min = dodag->dio_min;
dodag_conf->dio_redun = dodag->dio_redun;
dodag_conf->max_rank_inc = byteorder_htons(dodag->instance->max_rank_inc);
dodag_conf->min_hop_rank_inc = byteorder_htons(dodag->instance->min_hop_rank_inc);
dodag_conf->ocp = byteorder_htons(dodag->instance->of->ocp);
dodag_conf->reserved = 0;
dodag_conf->default_lifetime = dodag->default_lifetime;
dodag_conf->lifetime_unit = byteorder_htons(dodag->lifetime_unit);
pos += sizeof(*dodag_conf);
gnrc_rpl_opt_prefix_info_t *prefix_info;
prefix_info = (gnrc_rpl_opt_prefix_info_t *) pos;
prefix_info->type = GNRC_RPL_OPT_PREFIX_INFO;
prefix_info->length = GNRC_RPL_OPT_PREFIX_INFO_LEN;
/* auto-address configuration */
prefix_info->LAR_flags = GNRC_RPL_PREFIX_AUTO_ADDRESS_BIT;
prefix_info->valid_lifetime = dodag->addr_valid;
prefix_info->pref_lifetime = dodag->addr_preferred;
prefix_info->prefix_len = dodag->prefix_len;
prefix_info->reserved = 0;
memset(&prefix_info->prefix, 0, sizeof(prefix_info->prefix));
ipv6_addr_init_prefix(&prefix_info->prefix, &dodag->dodag_id, dodag->prefix_len);
}
dodag->dodag_conf_counter++;
gnrc_rpl_send(pkt, NULL, destination, &dodag->dodag_id);
}
void gnrc_rpl_p2p_recv_DRO(gnrc_pktsnip_t *pkt, ipv6_addr_t *src)
{
gnrc_pktsnip_t *icmpv6_snip = gnrc_pktbuf_mark(pkt, sizeof(icmpv6_hdr_t), GNRC_NETTYPE_ICMPV6);
gnrc_pktsnip_t *dro_snip = gnrc_pktbuf_mark(pkt, sizeof(gnrc_rpl_p2p_dro_t),
GNRC_NETTYPE_UNDEF);
gnrc_pktsnip_t *rdo_snip = gnrc_pktbuf_mark(pkt, sizeof(gnrc_rpl_p2p_opt_rdo_t),
GNRC_NETTYPE_UNDEF);
gnrc_pktsnip_t *addr_snip = pkt;
gnrc_rpl_instance_t *inst;
gnrc_rpl_dodag_t *dodag;
gnrc_rpl_p2p_ext_t *p2p_ext;
gnrc_rpl_p2p_dro_t *dro;
gnrc_rpl_p2p_opt_rdo_t *rdo;
uint8_t *addr_vec;
uint16_t flags;
size_t addr_len;
if (!rdo_snip || !dro_snip) {
DEBUG("RPL-P2P: Error - No DRO or RDO received\n");
gnrc_pktbuf_release(pkt);
return;
}
dro = dro_snip->data;
if ((inst = gnrc_rpl_instance_get(dro->instance_id)) == NULL) {
DEBUG("RPL-P2P: Error - Instance (%d) does not exist\n", dro->instance_id);
return;
}
dodag = &inst->dodag;
if ((p2p_ext = gnrc_rpl_p2p_ext_get(dodag)) == NULL) {
DEBUG("RPL-P2P: Error - No P2P-RPL DODAG extension found\n");
return;
}
if (p2p_ext->for_me) {
DEBUG("RPL-P2P: Ignore DRO\n");
return;
}
flags = byteorder_ntohs(dro->flags_rev);
p2p_ext->stop = (flags & (1 << GNRC_RPL_P2P_DRO_FLAGS_STOP)) >> GNRC_RPL_P2P_DRO_FLAGS_STOP;
p2p_ext->dro_ack = (flags & (1 << GNRC_RPL_P2P_DRO_FLAGS_ACK)) >> GNRC_RPL_P2P_DRO_FLAGS_ACK;
p2p_ext->dro_seq = (flags & (0x3 << GNRC_RPL_P2P_DRO_FLAGS_SEQ)) >> GNRC_RPL_P2P_DRO_FLAGS_SEQ;
addr_len = sizeof(ipv6_addr_t) - p2p_ext->compr;
ipv6_addr_t addr = p2p_ext->dodag->dodag_id;
ipv6_addr_t *me = NULL;
addr_vec = addr_snip->data;
rdo = rdo_snip->data;
if (rdo->lmn > 0) {
rdo->lmn--;
memcpy(&addr.u8[p2p_ext->compr], &addr_vec[addr_len * rdo->lmn], addr_len);
}
if (gnrc_ipv6_netif_find_by_addr(&me, &addr) == dodag->iface) {
gnrc_ipv6_nib_ft_add(&p2p_ext->target, IPV6_ADDR_BIT_LEN, src, dodag->iface,
p2p_ext->dodag->default_lifetime *
p2p_ext->dodag->lifetime_unit);
if (p2p_ext->dodag->node_status != GNRC_RPL_ROOT_NODE) {
if ((rdo_snip = gnrc_pktbuf_start_write(rdo_snip)) == NULL) {
DEBUG("RPL-P2P: Error - Cannot allocate new RDO\n");
return;
}
addr_snip->next = NULL;
rdo_snip->next = addr_snip;
dro_snip->next = rdo_snip;
icmpv6_snip = gnrc_icmpv6_build(dro_snip, ICMPV6_RPL_CTRL, GNRC_RPL_P2P_ICMPV6_CODE_DRO,
sizeof(icmpv6_hdr_t));
if (icmpv6_snip == NULL) {
DEBUG("RPL-P2P: cannot allocate ICMPv6 - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
gnrc_rpl_send(icmpv6_snip, p2p_ext->dodag->iface, NULL, NULL, &p2p_ext->dodag->dodag_id);
return;
}
}
gnrc_pktbuf_release(pkt);
return;
}
static gnrc_pktsnip_t *_build_initial_DRO(gnrc_rpl_p2p_ext_t *p2p_ext)
{
gnrc_pktsnip_t *pkt = NULL, *opt_snip = NULL;
gnrc_rpl_p2p_dro_t *dro = NULL;
gnrc_rpl_p2p_opt_rdo_t *rdo = NULL;
size_t addr_len = (sizeof(ipv6_addr_t) - p2p_ext->compr);
uint8_t addr_size = p2p_ext->addr_numof * addr_len;
for (uint8_t i = p2p_ext->addr_numof; i > 0; i--) {
if ((opt_snip = gnrc_pktbuf_add(pkt, NULL, addr_len, GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL-P2P: cannot add addresses to RDO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
memcpy(opt_snip->data, &p2p_ext->addr_vec[i-1], addr_len);
pkt = opt_snip;
}
if ((opt_snip = gnrc_pktbuf_add(pkt, NULL, sizeof(gnrc_rpl_p2p_opt_rdo_t),
GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL-P2P: cannot allocate DRO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
rdo = opt_snip->data;
rdo->type = GNRC_RPL_P2P_OPT_RDO;
rdo->length = GNRC_RPL_P2P_RDO_LEN + addr_size;
rdo->compr_flags = (p2p_ext->hop_by_hop << GNRC_RPL_P2P_RDO_FLAGS_HBH) |
(p2p_ext->compr & GNRC_RPL_P2P_RDO_FLAGS_COMPR);
/* rdo->length does not include the first two bytes, thus we have to add them manually */
rdo->lmn = (((rdo->length + 2 - sizeof(*rdo)) / addr_len) & GNRC_RPL_P2P_RDO_FLAGS_NEXT_HOP);
rdo->target = p2p_ext->target;
pkt = opt_snip;
if ((opt_snip = gnrc_pktbuf_add(pkt, NULL, sizeof(gnrc_rpl_p2p_dro_t),
GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL-P2P: cannot allocate RDO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
dro = opt_snip->data;
dro->instance_id = p2p_ext->dodag->instance->id;
dro->version_number = 0;
dro->flags_rev = byteorder_htons((((p2p_ext->stop << 1) | (p2p_ext->dro_ack << 0))
<< GNRC_RPL_P2P_DRO_FLAGS_ACK) |
((p2p_ext->dro_seq & 0x3) << GNRC_RPL_P2P_DRO_FLAGS_SEQ));
dro->dodag_id = p2p_ext->dodag->dodag_id;
pkt = opt_snip;
if ((opt_snip = gnrc_icmpv6_build(pkt, ICMPV6_RPL_CTRL, GNRC_RPL_P2P_ICMPV6_CODE_DRO,
sizeof(icmpv6_hdr_t))) == NULL) {
DEBUG("RPL-P2P: cannot allocate ICMPv6 - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
pkt = opt_snip;
return pkt;
}