/
gnrc_rpl_control_messages.c
1077 lines (901 loc) · 37 KB
/
gnrc_rpl_control_messages.c
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/*
* Copyright (C) 2013 - 2014 INRIA.
* Copyright (C) 2015 Cenk Gündoğan <cnkgndgn@gmail.com>
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @{
*
* @file
*
* @author Cenk Gündoğan <cnkgndgn@gmail.com>
*/
#include "net/af.h"
#include "net/icmpv6.h"
#include "net/ipv6/hdr.h"
#include "net/gnrc/icmpv6.h"
#include "net/gnrc/ipv6.h"
#include "net/gnrc.h"
#include "net/eui64.h"
#include "net/gnrc/rpl.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#if ENABLE_DEBUG
static char addr_str[IPV6_ADDR_MAX_STR_LEN];
#endif
#define GNRC_RPL_GROUNDED_SHIFT (7)
#define GNRC_RPL_MOP_SHIFT (3)
#define GNRC_RPL_OPT_DODAG_CONF_LEN (14)
#define GNRC_RPL_OPT_PREFIX_INFO_LEN (30)
#define GNRC_RPL_OPT_TARGET_LEN (18)
#define GNRC_RPL_OPT_TRANSIT_E_FLAG_SHIFT (7)
#define GNRC_RPL_OPT_TRANSIT_E_FLAG (1 << GNRC_RPL_OPT_TRANSIT_E_FLAG_SHIFT)
#define GNRC_RPL_OPT_TRANSIT_INFO_LEN (4)
#define GNRC_RPL_SHIFTED_MOP_MASK (0x7)
#define GNRC_RPL_PRF_MASK (0x7)
#define GNRC_RPL_PREFIX_AUTO_ADDRESS_BIT (1 << 6)
#define GNRC_RPL_DAO_D_BIT (1 << 6)
#define GNRC_RPL_DAO_K_BIT (1 << 7)
#define GNRC_RPL_DAO_ACK_D_BIT (1 << 7)
void gnrc_rpl_send(gnrc_pktsnip_t *pkt, kernel_pid_t iface, ipv6_addr_t *src, ipv6_addr_t *dst,
ipv6_addr_t *dodag_id)
{
(void)dodag_id;
gnrc_pktsnip_t *hdr;
ipv6_addr_t ll_addr;
if (iface == KERNEL_PID_UNDEF) {
if ((iface = gnrc_ipv6_netif_find_by_addr(NULL, &ipv6_addr_all_rpl_nodes))
== KERNEL_PID_UNDEF) {
DEBUG("RPL: no suitable interface found for this destination address\n");
gnrc_pktbuf_release(pkt);
return;
}
}
if (src == NULL) {
ipv6_addr_set_link_local_prefix(&ll_addr);
src = gnrc_ipv6_netif_match_prefix(iface, &ll_addr);
if (src == NULL) {
DEBUG("RPL: no suitable src address found\n");
gnrc_pktbuf_release(pkt);
return;
}
}
if (dst == NULL) {
dst = (ipv6_addr_t *) &ipv6_addr_all_rpl_nodes;
}
hdr = gnrc_ipv6_hdr_build(pkt, (uint8_t *)src, sizeof(ipv6_addr_t), (uint8_t *)dst,
sizeof(ipv6_addr_t));
if (hdr == NULL) {
DEBUG("RPL: Send - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = hdr;
hdr = gnrc_netif_hdr_build(NULL, 0, NULL, 0);
((gnrc_netif_hdr_t *)hdr->data)->if_pid = iface;
LL_PREPEND(pkt, hdr);
if (!gnrc_netapi_dispatch_send(GNRC_NETTYPE_IPV6, GNRC_NETREG_DEMUX_CTX_ALL, pkt)) {
DEBUG("RPL: cannot send packet: no subscribers found.\n");
gnrc_pktbuf_release(pkt);
}
}
gnrc_pktsnip_t *_dio_dodag_conf_build(gnrc_pktsnip_t *pkt, gnrc_rpl_dodag_t *dodag)
{
gnrc_rpl_opt_dodag_conf_t *dodag_conf;
gnrc_pktsnip_t *opt_snip;
if ((opt_snip = gnrc_pktbuf_add(pkt, NULL, sizeof(gnrc_rpl_opt_dodag_conf_t),
GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL: BUILD DODAG CONF - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
dodag_conf = opt_snip->data;
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);
return opt_snip;
}
#ifndef GNRC_RPL_WITHOUT_PIO
gnrc_pktsnip_t *_dio_prefix_info_build(gnrc_pktsnip_t *pkt, gnrc_rpl_dodag_t *dodag)
{
gnrc_rpl_opt_prefix_info_t *prefix_info;
gnrc_pktsnip_t *opt_snip;
if ((opt_snip = gnrc_pktbuf_add(pkt, NULL, sizeof(gnrc_rpl_opt_prefix_info_t),
GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL: BUILD PREFIX INFO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
prefix_info = opt_snip->data;
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->netif_addr->valid;
prefix_info->pref_lifetime = dodag->netif_addr->preferred;
prefix_info->prefix_len = dodag->netif_addr->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->netif_addr->prefix_len);
return opt_snip;
}
#endif
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;
gnrc_rpl_dio_t *dio;
#ifndef GNRC_RPL_WITHOUT_PIO
if (dodag->dio_opts & GNRC_RPL_REQ_DIO_OPT_PREFIX_INFO) {
if ((pkt = _dio_prefix_info_build(pkt, dodag)) == NULL) {
return;
}
}
#endif
if (dodag->dio_opts & GNRC_RPL_REQ_DIO_OPT_DODAG_CONF) {
if ((pkt = _dio_dodag_conf_build(pkt, dodag)) == NULL) {
return;
}
dodag->dio_opts &= ~GNRC_RPL_REQ_DIO_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, dodag->iface, NULL, destination, &dodag->dodag_id);
}
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, KERNEL_PID_UNDEF, NULL, destination, (inst? &(inst->dodag.dodag_id) : NULL));
}
static bool _gnrc_rpl_check_DIS_validity(gnrc_rpl_dis_t *dis, uint16_t len)
{
uint16_t expected_len = sizeof(*dis) + sizeof(icmpv6_hdr_t);
if (expected_len <= len) {
return true;
}
DEBUG("RPL: wrong DIS len: %d, expected: %d\n", len, expected_len);
return false;
}
void gnrc_rpl_recv_DIS(gnrc_rpl_dis_t *dis, kernel_pid_t iface, ipv6_addr_t *src,
ipv6_addr_t *dst, uint16_t len)
{
/* TODO handle Solicited Information Option */
(void)iface;
if (!_gnrc_rpl_check_DIS_validity(dis, len)) {
return;
}
if (ipv6_addr_is_multicast(dst)) {
for (uint8_t i = 0; i < GNRC_RPL_INSTANCES_NUMOF; ++i) {
if ((gnrc_rpl_instances[i].state != 0)
/* a leaf node should only react to unicast DIS */
&& (gnrc_rpl_instances[i].dodag.node_status != GNRC_RPL_LEAF_NODE)) {
trickle_reset_timer(&(gnrc_rpl_instances[i].dodag.trickle));
}
}
}
else {
for (uint8_t i = 0; i < GNRC_RPL_INSTANCES_NUMOF; ++i) {
if (gnrc_rpl_instances[i].state != 0) {
gnrc_rpl_instances[i].dodag.dio_opts |= GNRC_RPL_REQ_DIO_OPT_DODAG_CONF;
gnrc_rpl_send_DIO(&gnrc_rpl_instances[i], src);
}
}
}
}
static bool _gnrc_rpl_check_options_validity(int msg_type, gnrc_rpl_instance_t *inst,
gnrc_rpl_opt_t *opt, uint16_t len)
{
uint16_t expected_len = 0;
while(expected_len < len) {
switch(opt->type) {
case (GNRC_RPL_OPT_PAD1):
expected_len += 1;
opt = (gnrc_rpl_opt_t *) (((uint8_t *) opt) + 1);
continue;
case (GNRC_RPL_OPT_DODAG_CONF):
if (msg_type != GNRC_RPL_ICMPV6_CODE_DIO) {
DEBUG("RPL: DODAG CONF DIO option not expected\n");
return false;
}
if (opt->length != GNRC_RPL_OPT_DODAG_CONF_LEN) {
DEBUG("RPL: wrong DIO option (DODAG CONF) len: %d, expected: %d\n",
opt->length, GNRC_RPL_OPT_DODAG_CONF_LEN);
return false;
}
break;
case (GNRC_RPL_OPT_PREFIX_INFO):
if (msg_type != GNRC_RPL_ICMPV6_CODE_DIO) {
DEBUG("RPL: PREFIX INFO DIO option not expected\n");
return false;
}
if (opt->length != GNRC_RPL_OPT_PREFIX_INFO_LEN) {
DEBUG("RPL: wrong DIO option (PREFIX INFO) len: %d, expected: %d\n",
opt->length, GNRC_RPL_OPT_PREFIX_INFO_LEN);
return false;
}
break;
case (GNRC_RPL_OPT_TARGET):
if (msg_type != GNRC_RPL_ICMPV6_CODE_DAO) {
DEBUG("RPL: RPL TARGET DAO option not expected\n");
return false;
}
if (opt->length > GNRC_RPL_OPT_TARGET_LEN) {
DEBUG("RPL: wrong DAO option (RPL TARGET) len: %d, expected (max): %d\n",
opt->length, GNRC_RPL_OPT_TARGET_LEN);
return false;
}
break;
case (GNRC_RPL_OPT_TRANSIT):
if (msg_type != GNRC_RPL_ICMPV6_CODE_DAO) {
DEBUG("RPL: RPL TRANSIT INFO DAO option not expected\n");
return false;
}
uint8_t parent_addr = 0;
if (inst->mop == GNRC_RPL_MOP_NON_STORING_MODE) {
parent_addr = sizeof(ipv6_addr_t);
}
if (opt->length != (GNRC_RPL_OPT_TRANSIT_INFO_LEN + parent_addr)) {
DEBUG("RPL: wrong DAO option (TRANSIT INFO) len: %d, expected: %d\n",
opt->length, (GNRC_RPL_OPT_TRANSIT_INFO_LEN + parent_addr));
return false;
}
break;
default:
break;
}
expected_len += opt->length + sizeof(gnrc_rpl_opt_t);
opt = (gnrc_rpl_opt_t *) (((uint8_t *) (opt + 1)) + opt->length);
}
if (expected_len == len) {
return true;
}
DEBUG("RPL: wrong options len: %d, expected: %d\n", len, expected_len);
return false;
}
/** @todo allow target prefixes in target options to be of variable length */
bool _parse_options(int msg_type, gnrc_rpl_instance_t *inst, gnrc_rpl_opt_t *opt, uint16_t len,
ipv6_addr_t *src, uint32_t *included_opts)
{
uint16_t l = 0;
gnrc_rpl_opt_target_t *first_target = NULL;
gnrc_rpl_dodag_t *dodag = &inst->dodag;
eui64_t iid;
*included_opts = 0;
ipv6_addr_t *me;
if (!_gnrc_rpl_check_options_validity(msg_type, inst, opt, len)) {
return false;
}
while(l < len) {
switch(opt->type) {
case (GNRC_RPL_OPT_PAD1):
DEBUG("RPL: PAD1 option parsed\n");
*included_opts |= ((uint32_t) 1) << GNRC_RPL_OPT_PAD1;
l += 1;
opt = (gnrc_rpl_opt_t *) (((uint8_t *) opt) + 1);
continue;
case (GNRC_RPL_OPT_PADN):
DEBUG("RPL: PADN option parsed\n");
*included_opts |= ((uint32_t) 1) << GNRC_RPL_OPT_PADN;
break;
case (GNRC_RPL_OPT_DODAG_CONF):
DEBUG("RPL: DODAG CONF DIO option parsed\n");
*included_opts |= ((uint32_t) 1) << GNRC_RPL_OPT_DODAG_CONF;
dodag->dio_opts |= GNRC_RPL_REQ_DIO_OPT_DODAG_CONF;
gnrc_rpl_opt_dodag_conf_t *dc = (gnrc_rpl_opt_dodag_conf_t *) opt;
gnrc_rpl_of_t *of = gnrc_rpl_get_of_for_ocp(byteorder_ntohs(dc->ocp));
if (of != NULL) {
inst->of = of;
}
else {
DEBUG("RPL: Unsupported OCP 0x%02x\n", byteorder_ntohs(dc->ocp));
inst->of = gnrc_rpl_get_of_for_ocp(GNRC_RPL_DEFAULT_OCP);
}
dodag->dio_interval_doubl = dc->dio_int_doubl;
dodag->dio_min = dc->dio_int_min;
dodag->dio_redun = dc->dio_redun;
inst->max_rank_inc = byteorder_ntohs(dc->max_rank_inc);
inst->min_hop_rank_inc = byteorder_ntohs(dc->min_hop_rank_inc);
dodag->default_lifetime = dc->default_lifetime;
dodag->lifetime_unit = byteorder_ntohs(dc->lifetime_unit);
dodag->trickle.Imin = (1 << dodag->dio_min);
dodag->trickle.Imax = dodag->dio_interval_doubl;
dodag->trickle.k = dodag->dio_redun;
break;
case (GNRC_RPL_OPT_PREFIX_INFO):
DEBUG("RPL: Prefix Information DIO option parsed\n");
*included_opts |= ((uint32_t) 1) << GNRC_RPL_OPT_PREFIX_INFO;
#ifndef GNRC_RPL_WITHOUT_PIO
dodag->dio_opts |= GNRC_RPL_REQ_DIO_OPT_PREFIX_INFO;
#endif
gnrc_rpl_opt_prefix_info_t *pi = (gnrc_rpl_opt_prefix_info_t *) opt;
/* check for the auto address-configuration flag */
if ((gnrc_netapi_get(dodag->iface, NETOPT_IPV6_IID, 0, &iid, sizeof(eui64_t)) < 0)
&& !(pi->LAR_flags & GNRC_RPL_PREFIX_AUTO_ADDRESS_BIT)) {
break;
}
ipv6_addr_set_aiid(&pi->prefix, iid.uint8);
me = gnrc_ipv6_netif_add_addr(dodag->iface, &pi->prefix, pi->prefix_len, 0);
if (me) {
dodag->netif_addr = gnrc_ipv6_netif_addr_get(me);
}
break;
case (GNRC_RPL_OPT_TARGET):
DEBUG("RPL: RPL TARGET DAO option parsed\n");
*included_opts |= ((uint32_t) 1) << GNRC_RPL_OPT_TARGET;
gnrc_rpl_opt_target_t *target = (gnrc_rpl_opt_target_t *) opt;
if (first_target == NULL) {
first_target = target;
}
uint32_t fib_dst_flags = 0;
if (target->prefix_length < IPV6_ADDR_BIT_LEN) {
fib_dst_flags |= FIB_FLAG_NET_PREFIX;
}
DEBUG("RPL: adding fib entry %s/%d 0x%x\n",
ipv6_addr_to_str(addr_str, &(target->target), sizeof(addr_str)),
target->prefix_length,
fib_dst_flags);
fib_add_entry(&gnrc_ipv6_fib_table, dodag->iface, target->target.u8,
sizeof(ipv6_addr_t), fib_dst_flags, src->u8,
sizeof(ipv6_addr_t), FIB_FLAG_RPL_ROUTE,
(dodag->default_lifetime * dodag->lifetime_unit) *
SEC_IN_MS);
break;
case (GNRC_RPL_OPT_TRANSIT):
DEBUG("RPL: RPL TRANSIT INFO DAO option parsed\n");
*included_opts |= ((uint32_t) 1) << GNRC_RPL_OPT_TRANSIT;
gnrc_rpl_opt_transit_t *transit = (gnrc_rpl_opt_transit_t *) opt;
if (first_target == NULL) {
DEBUG("RPL: Encountered a RPL TRANSIT DAO option without "
"a preceding RPL TARGET DAO option\n");
break;
}
do {
DEBUG("RPL: updating fib entry %s/%d\n",
ipv6_addr_to_str(addr_str, &(first_target->target), sizeof(addr_str)),
first_target->prefix_length);
fib_update_entry(&gnrc_ipv6_fib_table,
first_target->target.u8,
sizeof(ipv6_addr_t), src->u8,
sizeof(ipv6_addr_t),
((transit->e_flags & GNRC_RPL_OPT_TRANSIT_E_FLAG) ?
0x0 : FIB_FLAG_RPL_ROUTE),
(transit->path_lifetime *
dodag->lifetime_unit * SEC_IN_MS));
first_target = (gnrc_rpl_opt_target_t *) (((uint8_t *) (first_target)) +
sizeof(gnrc_rpl_opt_t) + first_target->length);
}
while (first_target->type == GNRC_RPL_OPT_TARGET);
first_target = NULL;
break;
}
l += opt->length + sizeof(gnrc_rpl_opt_t);
opt = (gnrc_rpl_opt_t *) (((uint8_t *) (opt + 1)) + opt->length);
}
return true;
}
static bool _gnrc_rpl_check_DIO_validity(gnrc_rpl_dio_t *dio, uint16_t len)
{
uint16_t expected_len = sizeof(*dio) + sizeof(icmpv6_hdr_t);
if (expected_len <= len) {
return true;
}
DEBUG("RPL: wrong DIO len: %d, expected: %d\n", len, expected_len);
return false;
}
void gnrc_rpl_recv_DIO(gnrc_rpl_dio_t *dio, kernel_pid_t iface, ipv6_addr_t *src, uint16_t len)
{
gnrc_rpl_instance_t *inst = NULL;
gnrc_rpl_dodag_t *dodag = NULL;
if (!_gnrc_rpl_check_DIO_validity(dio, len)) {
return;
}
len -= (sizeof(gnrc_rpl_dio_t) + sizeof(icmpv6_hdr_t));
if (gnrc_rpl_instance_add(dio->instance_id, &inst)) {
/* new instance and DODAG */
if (byteorder_ntohs(dio->rank) == GNRC_RPL_INFINITE_RANK) {
DEBUG("RPL: ignore INFINITE_RANK DIO when we are not yet part of this DODAG\n");
gnrc_rpl_instance_remove(inst);
return;
}
inst->mop = (dio->g_mop_prf >> GNRC_RPL_MOP_SHIFT) & GNRC_RPL_SHIFTED_MOP_MASK;
inst->of = gnrc_rpl_get_of_for_ocp(GNRC_RPL_DEFAULT_OCP);
if (iface == KERNEL_PID_UNDEF) {
iface = gnrc_ipv6_netif_find_by_addr(NULL, &ipv6_addr_all_rpl_nodes);
assert(iface != KERNEL_PID_UNDEF);
}
gnrc_rpl_dodag_init(inst, &dio->dodag_id, iface, NULL);
dodag = &inst->dodag;
DEBUG("RPL: Joined DODAG (%s).\n",
ipv6_addr_to_str(addr_str, &dio->dodag_id, sizeof(addr_str)));
gnrc_rpl_parent_t *parent = NULL;
if (!gnrc_rpl_parent_add_by_addr(dodag, src, &parent) && (parent == NULL)) {
DEBUG("RPL: Could not allocate new parent.\n");
gnrc_rpl_instance_remove(inst);
return;
}
dodag->version = dio->version_number;
dodag->grounded = dio->g_mop_prf >> GNRC_RPL_GROUNDED_SHIFT;
dodag->prf = dio->g_mop_prf & GNRC_RPL_PRF_MASK;
parent->rank = byteorder_ntohs(dio->rank);
uint32_t included_opts = 0;
if(!_parse_options(GNRC_RPL_ICMPV6_CODE_DIO, inst, (gnrc_rpl_opt_t *)(dio + 1), len,
src, &included_opts)) {
DEBUG("RPL: Error encountered during DIO option parsing - remove DODAG\n");
gnrc_rpl_instance_remove(inst);
return;
}
if (!(included_opts & (((uint32_t) 1) << GNRC_RPL_OPT_DODAG_CONF))) {
#ifndef GNRC_RPL_DODAG_CONF_OPTIONAL_ON_JOIN
DEBUG("RPL: DIO without DODAG_CONF option - remove DODAG and request new DIO\n");
gnrc_rpl_instance_remove(inst);
gnrc_rpl_send_DIS(NULL, src);
return;
#else
DEBUG("RPL: DIO without DODAG_CONF option - use default trickle parameters\n");
gnrc_rpl_send_DIS(NULL, src);
#endif
}
/* if there was no netif_addr created manually or by a PIO, then leave this DODAG */
if (!dodag->netif_addr) {
ipv6_addr_t *configured_addr;
if (!(configured_addr = gnrc_ipv6_netif_match_prefix(dodag->iface, &dodag->dodag_id))) {
DEBUG("RPL: no IPv6 address configured to match the given dodag id: %s\n",
ipv6_addr_to_str(addr_str, dodag_id, sizeof(addr_str)));
gnrc_rpl_instance_remove(inst);
return;
}
if (!(dodag->netif_addr = gnrc_ipv6_netif_addr_get(configured_addr))) {
DEBUG("RPL: no netif address found for %s\n",
ipv6_addr_to_str(addr_str, configured_addr, sizeof(addr_str)));
gnrc_rpl_instance_remove(inst);
return;
}
}
gnrc_rpl_delay_dao(dodag);
trickle_start(gnrc_rpl_pid, &dodag->trickle, GNRC_RPL_MSG_TYPE_TRICKLE_INTERVAL,
GNRC_RPL_MSG_TYPE_TRICKLE_CALLBACK, (1 << dodag->dio_min),
dodag->dio_interval_doubl, dodag->dio_redun);
gnrc_rpl_parent_update(dodag, parent);
return;
}
else if (inst == NULL) {
DEBUG("RPL: Could not allocate a new instance.\n");
return;
}
else {
/* instance exists already */
/* ignore dodags with other dodag_id's for now */
/* TODO: choose DODAG with better rank */
dodag = &inst->dodag;
if (memcmp(&dodag->dodag_id, &dio->dodag_id, sizeof(ipv6_addr_t)) != 0) {
DEBUG("RPL: DIO received from another DODAG, but same instance - ignore\n");
return;
}
}
if (inst->mop != ((dio->g_mop_prf >> GNRC_RPL_MOP_SHIFT) & GNRC_RPL_SHIFTED_MOP_MASK)) {
DEBUG("RPL: invalid MOP for this instance.\n");
return;
}
if (GNRC_RPL_COUNTER_GREATER_THAN(dio->version_number, dodag->version)) {
if (dodag->node_status == GNRC_RPL_ROOT_NODE) {
dodag->version = GNRC_RPL_COUNTER_INCREMENT(dio->version_number);
trickle_reset_timer(&dodag->trickle);
}
else {
dodag->version = dio->version_number;
gnrc_rpl_local_repair(dodag);
}
}
else if (GNRC_RPL_COUNTER_GREATER_THAN(dodag->version, dio->version_number)) {
trickle_reset_timer(&dodag->trickle);
return;
}
if (dodag->node_status == GNRC_RPL_ROOT_NODE) {
if (byteorder_ntohs(dio->rank) != GNRC_RPL_INFINITE_RANK) {
trickle_increment_counter(&dodag->trickle);
}
else {
trickle_reset_timer(&dodag->trickle);
}
return;
}
gnrc_rpl_parent_t *parent = NULL;
if (!gnrc_rpl_parent_add_by_addr(dodag, src, &parent) && (parent == NULL)) {
DEBUG("RPL: Could not allocate new parent.\n");
return;
}
/* cppcheck-suppress nullPointer */
else if (parent != NULL) {
trickle_increment_counter(&dodag->trickle);
}
/* gnrc_rpl_parent_add_by_addr should have set this already */
assert(parent != NULL);
parent->rank = byteorder_ntohs(dio->rank);
gnrc_rpl_parent_update(dodag, parent);
/* sender of incoming DIO is not a parent of mine (anymore) and has an INFINITE rank
and I have a rank != INFINITE_RANK */
if (parent->state == 0) {
if ((byteorder_ntohs(dio->rank) == GNRC_RPL_INFINITE_RANK)
&& (dodag->my_rank != GNRC_RPL_INFINITE_RANK)) {
trickle_reset_timer(&dodag->trickle);
return;
}
}
/* incoming DIO is from pref. parent */
else if (parent == dodag->parents) {
if (parent->dtsn != dio->dtsn) {
gnrc_rpl_delay_dao(dodag);
}
parent->dtsn = dio->dtsn;
dodag->grounded = dio->g_mop_prf >> GNRC_RPL_GROUNDED_SHIFT;
dodag->prf = dio->g_mop_prf & GNRC_RPL_PRF_MASK;
uint32_t included_opts = 0;
if(!_parse_options(GNRC_RPL_ICMPV6_CODE_DIO, inst, (gnrc_rpl_opt_t *)(dio + 1), len,
src, &included_opts)) {
DEBUG("RPL: Error encountered during DIO option parsing - remove DODAG\n");
gnrc_rpl_instance_remove(inst);
return;
}
}
}
gnrc_pktsnip_t *_dao_target_build(gnrc_pktsnip_t *pkt, ipv6_addr_t *addr, uint8_t prefix_length)
{
gnrc_rpl_opt_target_t *target;
gnrc_pktsnip_t *opt_snip;
if ((opt_snip = gnrc_pktbuf_add(pkt, NULL, sizeof(gnrc_rpl_opt_target_t),
GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
target = opt_snip->data;
target->type = GNRC_RPL_OPT_TARGET;
target->length = sizeof(target->flags) + sizeof(target->prefix_length) + sizeof(target->target);
target->flags = 0;
target->prefix_length = prefix_length;
target->target = *addr;
return opt_snip;
}
gnrc_pktsnip_t *_dao_transit_build(gnrc_pktsnip_t *pkt, uint8_t lifetime, bool external)
{
gnrc_rpl_opt_transit_t *transit;
gnrc_pktsnip_t *opt_snip;
if ((opt_snip = gnrc_pktbuf_add(pkt, NULL, sizeof(gnrc_rpl_opt_transit_t),
GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return NULL;
}
transit = opt_snip->data;
transit->type = GNRC_RPL_OPT_TRANSIT;
transit->length = sizeof(transit->e_flags) + sizeof(transit->path_control) +
sizeof(transit->path_sequence) + sizeof(transit->path_lifetime);
transit->e_flags = (external) << GNRC_RPL_OPT_TRANSIT_E_FLAG_SHIFT;
transit->path_control = 0;
transit->path_sequence = 0;
transit->path_lifetime = lifetime;
return opt_snip;
}
void gnrc_rpl_send_DAO(gnrc_rpl_instance_t *inst, ipv6_addr_t *destination, uint8_t lifetime)
{
gnrc_rpl_dodag_t *dodag;
if (inst == NULL) {
DEBUG("RPL: Error - trying to send DAO without being part of a dodag.\n");
return;
}
dodag = &inst->dodag;
if (dodag->node_status == GNRC_RPL_ROOT_NODE) {
return;
}
if (destination == NULL) {
if (dodag->parents == NULL) {
DEBUG("RPL: dodag has no preferred parent\n");
return;
}
destination = &(dodag->parents->addr);
}
gnrc_pktsnip_t *pkt = NULL, **ptr = NULL, *tmp = NULL, *tr_int = NULL;
gnrc_rpl_dao_t *dao;
bool ext_processed = false, int_processed = false;
/* find my address */
ipv6_addr_t *me = NULL;
gnrc_ipv6_netif_find_by_prefix(&me, &dodag->dodag_id);
if (me == NULL) {
DEBUG("RPL: no address configured\n");
return;
}
fib_entry_t *fentry = NULL;
ipv6_addr_t *addr = NULL;
mutex_lock(&(gnrc_ipv6_fib_table.mtx_access));
/* add external and RPL FIB entries */
for (size_t i = 0; i < gnrc_ipv6_fib_table.size; ++i) {
fentry = &gnrc_ipv6_fib_table.data.entries[i];
if (fentry->lifetime != 0) {
if (!(fentry->next_hop_flags & FIB_FLAG_RPL_ROUTE)) {
ptr = &tmp;
if (!ext_processed) {
DEBUG("RPL: Send DAO - building external transit\n");
if ((tmp = _dao_transit_build(NULL, lifetime, true)) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
mutex_unlock(&(gnrc_ipv6_fib_table.mtx_access));
return;
}
ext_processed = true;
}
}
else {
ptr = &pkt;
if (!int_processed) {
DEBUG("RPL: Send DAO - building internal transit\n");
if ((tr_int = pkt = _dao_transit_build(NULL, lifetime, false)) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
mutex_unlock(&(gnrc_ipv6_fib_table.mtx_access));
return;
}
int_processed = true;
}
}
addr = (ipv6_addr_t *) fentry->global->address;
if (ipv6_addr_is_global(addr)) {
size_t prefix_length;
if (fentry->global_flags & FIB_FLAG_NET_PREFIX) {
universal_address_compare(fentry->global,
fentry->global->address,
&prefix_length);
}
else {
prefix_length = IPV6_ADDR_BIT_LEN;
}
DEBUG("RPL: Send DAO - building target %s/%d\n",
ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)),
(int) prefix_length);
if ((*ptr = _dao_target_build(*ptr, addr, (uint8_t) prefix_length)) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
mutex_unlock(&(gnrc_ipv6_fib_table.mtx_access));
return;
}
}
}
}
mutex_unlock(&(gnrc_ipv6_fib_table.mtx_access));
if (tr_int) {
tr_int->next = tmp;
}
else {
pkt = tmp;
}
/* add own address */
DEBUG("RPL: Send DAO - building target %s/128\n",
ipv6_addr_to_str(addr_str, me, sizeof(addr_str)));
if ((pkt = _dao_target_build(pkt, me, IPV6_ADDR_BIT_LEN)) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
return;
}
bool local_instance = (inst->id & GNRC_RPL_INSTANCE_ID_MSB) ? true : false;
if (local_instance) {
if ((tmp = gnrc_pktbuf_add(pkt, &dodag->dodag_id, sizeof(ipv6_addr_t),
GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = tmp;
}
if ((tmp = gnrc_pktbuf_add(pkt, NULL, sizeof(gnrc_rpl_dao_t), GNRC_NETTYPE_UNDEF)) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = tmp;
dao = pkt->data;
dao->instance_id = inst->id;
if (local_instance) {
/* set the D flag to indicate that a DODAG id is present */
dao->k_d_flags = GNRC_RPL_DAO_D_BIT;
}
else {
dao->k_d_flags = 0;
}
/* set the K flag to indicate that ACKs are required */
dao->k_d_flags |= GNRC_RPL_DAO_K_BIT;
dao->dao_sequence = dodag->dao_seq;
dao->reserved = 0;
if ((tmp = gnrc_icmpv6_build(pkt, ICMPV6_RPL_CTRL, GNRC_RPL_ICMPV6_CODE_DAO,
sizeof(icmpv6_hdr_t))) == NULL) {
DEBUG("RPL: Send DAO - no space left in packet buffer\n");
gnrc_pktbuf_release(pkt);
return;
}
pkt = tmp;
gnrc_rpl_send(pkt, dodag->iface, NULL, destination, &dodag->dodag_id);
GNRC_RPL_COUNTER_INCREMENT(dodag->dao_seq);
}
void gnrc_rpl_send_DAO_ACK(gnrc_rpl_instance_t *inst, ipv6_addr_t *destination, uint8_t seq)
{
gnrc_rpl_dodag_t *dodag = NULL;
if (inst == NULL) {
DEBUG("RPL: Error - trying to send DAO-ACK without being part of a dodag.\n");
return;
}
dodag = &inst->dodag;
gnrc_pktsnip_t *pkt;
icmpv6_hdr_t *icmp;
gnrc_rpl_dao_ack_t *dao_ack;
int size = sizeof(icmpv6_hdr_t) + sizeof(gnrc_rpl_dao_ack_t);
bool local_instance = (inst->id & GNRC_RPL_INSTANCE_ID_MSB) ? true : false;
if (local_instance) {
size += sizeof(ipv6_addr_t);
}
if ((pkt = gnrc_icmpv6_build(NULL, ICMPV6_RPL_CTRL, GNRC_RPL_ICMPV6_CODE_DAO_ACK, size)) == NULL) {
DEBUG("RPL: Send DAOACK - no space left in packet buffer\n");
return;
}
icmp = (icmpv6_hdr_t *)pkt->data;
dao_ack = (gnrc_rpl_dao_ack_t *)(icmp + 1);
dao_ack->instance_id = inst->id;
if (local_instance) {
/* set the D flag to indicate that a DODAG id is present */
dao_ack->d_reserved = GNRC_RPL_DAO_ACK_D_BIT;
memcpy((dao_ack + 1), &dodag->dodag_id, sizeof(ipv6_addr_t));
}
else {
dao_ack->d_reserved = 0;
}
dao_ack->dao_sequence = seq;
dao_ack->status = 0;
gnrc_rpl_send(pkt, dodag->iface, NULL, destination, &dodag->dodag_id);
}
static bool _gnrc_rpl_check_DAO_validity(gnrc_rpl_dao_t *dao, uint16_t len)
{
uint16_t expected_len = sizeof(*dao) + sizeof(icmpv6_hdr_t);
if ((dao->k_d_flags & GNRC_RPL_DAO_D_BIT)) {
expected_len += sizeof(ipv6_addr_t);
}
if (expected_len <= len) {
return true;
}
DEBUG("RPL: wrong DAO len: %d, expected: %d\n", len, expected_len);
return false;
}
void gnrc_rpl_recv_DAO(gnrc_rpl_dao_t *dao, kernel_pid_t iface, ipv6_addr_t *src, uint16_t len)
{
(void)iface;
gnrc_rpl_instance_t *inst = NULL;
gnrc_rpl_dodag_t *dodag = NULL;
if (!_gnrc_rpl_check_DAO_validity(dao, len)) {
return;
}
gnrc_rpl_opt_t *opts = (gnrc_rpl_opt_t *) (dao + 1);
if ((inst = gnrc_rpl_instance_get(dao->instance_id)) == NULL) {
DEBUG("RPL: DAO with unknown instance id (%d) received\n", dao->instance_id);
return;
}
dodag = &inst->dodag;
len -= (sizeof(gnrc_rpl_dao_t) + sizeof(icmpv6_hdr_t));
/* check if the D flag is set before accessing the DODAG id */
if ((dao->k_d_flags & GNRC_RPL_DAO_D_BIT)) {
if (memcmp(&dodag->dodag_id, (ipv6_addr_t *)(dao + 1), sizeof(ipv6_addr_t)) != 0) {
DEBUG("RPL: DAO with unknown DODAG id (%s)\n", ipv6_addr_to_str(addr_str,
(ipv6_addr_t *)(dao + 1), sizeof(addr_str)));
return;
}
opts = (gnrc_rpl_opt_t *)(((uint8_t *) opts) + sizeof(ipv6_addr_t));
len -= sizeof(ipv6_addr_t);
}