51#include "net/routing/rpl-classic/rpl-private.h"
54#include "lib/random.h"
61#define LOG_MODULE "RPL"
62#define LOG_LEVEL LOG_LEVEL_RPL
65#define RPL_DIO_GROUNDED 0x80
66#define RPL_DIO_MOP_SHIFT 3
67#define RPL_DIO_MOP_MASK 0x38
68#define RPL_DIO_PREFERENCE_MASK 0x07
71static void dis_input(
void);
72static void dio_input(
void);
73static void dao_input(
void);
74static void dao_ack_input(
void);
76static void dao_output_target_seq(rpl_parent_t *parent, uip_ipaddr_t *prefix,
77 uint8_t lifetime, uint8_t seq_no);
80#ifdef RPL_DEBUG_DIO_INPUT
81void RPL_DEBUG_DIO_INPUT(uip_ipaddr_t *, rpl_dio_t *);
84#ifdef RPL_DEBUG_DAO_OUTPUT
85void RPL_DEBUG_DAO_OUTPUT(rpl_parent_t *);
88static uint8_t dao_sequence = RPL_LOLLIPOP_INIT;
95UIP_ICMP6_HANDLER(dis_handler,
ICMP6_RPL, RPL_CODE_DIS, dis_input);
96UIP_ICMP6_HANDLER(dio_handler,
ICMP6_RPL, RPL_CODE_DIO, dio_input);
97UIP_ICMP6_HANDLER(dao_handler,
ICMP6_RPL, RPL_CODE_DAO, dao_input);
98UIP_ICMP6_HANDLER(dao_ack_handler,
ICMP6_RPL, RPL_CODE_DAO_ACK, dao_ack_input);
103find_route_entry_by_dao_ack(uint8_t seq)
107 if(re->state.dao_seqno_out == seq && RPL_ROUTE_IS_DAO_PENDING(re)) {
111 re = uip_ds6_route_next(re);
123 RPL_LOLLIPOP_INCREMENT(dao_sequence);
126 rep->state.dao_seqno_in = sequence;
127 rep->state.dao_seqno_out = dao_sequence;
128 RPL_ROUTE_SET_DAO_PENDING(rep);
134get_global_addr(uip_ipaddr_t *
addr)
138 uip_ipaddr_t *prefix = NULL;
139 uint8_t prefix_length = 0;
142 if(dag != NULL && dag->prefix_info.length != 0) {
143 prefix = &dag->prefix_info.prefix;
144 prefix_length = dag->prefix_info.length;
147 for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
150 state == ADDR_PREFERRED &&
152 (prefix == NULL || uip_ipaddr_prefixcmp(prefix, &
uip_ds6_if.addr_list[i].ipaddr, prefix_length))) {
153 memcpy(
addr, &
uip_ds6_if.addr_list[i].ipaddr,
sizeof(uip_ipaddr_t));
161get32(uint8_t *buffer,
int pos)
163 return (uint32_t)buffer[pos] << 24 | (uint32_t)buffer[pos + 1] << 16 |
164 (uint32_t)buffer[pos + 2] << 8 | buffer[pos + 3];
168set32(uint8_t *buffer,
int pos, uint32_t value)
170 buffer[pos++] = value >> 24;
171 buffer[pos++] = (value >> 16) & 0xff;
172 buffer[pos++] = (value >> 8) & 0xff;
173 buffer[pos++] = value & 0xff;
177get16(uint8_t *buffer,
int pos)
179 return (uint16_t)buffer[pos] << 8 | buffer[pos + 1];
183set16(uint8_t *buffer,
int pos, uint16_t value)
185 buffer[pos++] = value >> 8;
186 buffer[pos++] = value & 0xff;
198 (uip_lladdr_t *)packetbuf_addr(PACKETBUF_ADDR_SENDER),
199 0, NBR_REACHABLE, reason, data);
201 LOG_INFO(
"Neighbor added to neighbor cache ");
202 LOG_INFO_6ADDR(from);
204 LOG_INFO_LLADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
219 LOG_INFO(
"Received a DIS from ");
223 for(instance = &instance_table[0], end = instance + RPL_MAX_INSTANCES;
224 instance < end; ++instance) {
225 if(instance->used == 1) {
228 LOG_INFO(
"LEAF ONLY Multicast DIS will NOT reset DIO timer\n");
230 LOG_DBG(
"Multicast DIS => reset DIO timer\n");
231 rpl_reset_dio_timer(instance);
236 NBR_TABLE_REASON_RPL_DIS, NULL) == NULL) {
237 LOG_ERR(
"Out of Memory, not sending unicast DIO, DIS from ");
240 LOG_ERR_LLADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
243 LOG_DBG(
"Unicast DIS, reply to sender\n");
254dis_output(uip_ipaddr_t *
addr)
256 unsigned char *buffer;
257 uip_ipaddr_t tmpaddr;
268 buffer = UIP_ICMP_PAYLOAD;
269 buffer[0] = buffer[1] = 0;
276 LOG_INFO(
"Sending a DIS to ");
277 LOG_INFO_6ADDR(
addr);
286 unsigned char *buffer;
287 uint8_t buffer_length;
294 memset(&dio, 0,
sizeof(dio));
297 dio.dag_intdoubl = RPL_DIO_INTERVAL_DOUBLINGS;
298 dio.dag_intmin = RPL_DIO_INTERVAL_MIN;
299 dio.dag_redund = RPL_DIO_REDUNDANCY;
300 dio.dag_min_hoprankinc = RPL_MIN_HOPRANKINC;
301 dio.dag_max_rankinc = RPL_MAX_RANKINC;
302 dio.ocp = RPL_OF_OCP;
303 dio.default_lifetime = RPL_DEFAULT_LIFETIME;
304 dio.lifetime_unit = RPL_DEFAULT_LIFETIME_UNIT;
309 LOG_INFO(
"Received a DIO from ");
310 LOG_INFO_6ADDR(&from);
313 buffer_length =
uip_len - uip_l3_icmp_hdr_len;
317 buffer = UIP_ICMP_PAYLOAD;
319 dio.instance_id = buffer[i++];
320 dio.version = buffer[i++];
321 dio.rank = get16(buffer, i);
324 LOG_DBG(
"Incoming DIO (id, ver, rank) = (%u,%u,%u)\n",
325 (
unsigned)dio.instance_id,
326 (
unsigned)dio.version,
329 dio.grounded = buffer[i] & RPL_DIO_GROUNDED;
330 dio.mop = (buffer[i] & RPL_DIO_MOP_MASK) >> RPL_DIO_MOP_SHIFT;
331 dio.preference = buffer[i++] & RPL_DIO_PREFERENCE_MASK;
333 dio.dtsn = buffer[i++];
337 memcpy(&dio.dag_id, buffer + i,
sizeof(dio.dag_id));
338 i +=
sizeof(dio.dag_id);
340 LOG_DBG(
"Incoming DIO (dag_id, pref) = (");
341 LOG_DBG_6ADDR(&dio.dag_id);
342 LOG_DBG_(
", %u)\n", dio.preference);
345 for(; i < buffer_length; i += len) {
346 subopt_type = buffer[i];
347 if(subopt_type == RPL_OPTION_PAD1) {
351 len = 2 + buffer[i + 1];
354 if(len + i > buffer_length) {
355 LOG_WARN(
"Invalid DIO packet\n");
356 RPL_STAT(rpl_stats.malformed_msgs++);
360 LOG_DBG(
"Incoming DIO (option, length) = (%u, %u)\n",
363 switch(subopt_type) {
364 case RPL_OPTION_PAD1:
365 case RPL_OPTION_PADN:
366 LOG_DBG(
"PAD %u bytes\n", len);
368 case RPL_OPTION_DAG_METRIC_CONTAINER:
370 LOG_WARN(
"Invalid DAG MC, len = %d\n", len);
371 RPL_STAT(rpl_stats.malformed_msgs++);
374 dio.mc.type = buffer[i + 2];
375 dio.mc.flags = buffer[i + 3] << 1;
376 dio.mc.flags |= buffer[i + 4] >> 7;
377 dio.mc.aggr = (buffer[i + 4] >> 4) & 0x3;
378 dio.mc.prec = buffer[i + 4] & 0xf;
379 dio.mc.length = buffer[i + 5];
381 if(dio.mc.type == RPL_DAG_MC_NONE) {
383 }
else if(dio.mc.type == RPL_DAG_MC_ETX) {
384 dio.mc.obj.etx = get16(buffer, i + 6);
386 LOG_DBG(
"DAG MC: type %u, flags %u, aggr %u, prec %u, length %u, ETX %u\n",
387 (
unsigned)dio.mc.type,
388 (
unsigned)dio.mc.flags,
389 (
unsigned)dio.mc.aggr,
390 (
unsigned)dio.mc.prec,
391 (
unsigned)dio.mc.length,
392 (
unsigned)dio.mc.obj.etx);
393 }
else if(dio.mc.type == RPL_DAG_MC_ENERGY) {
394 dio.mc.obj.energy.flags = buffer[i + 6];
395 dio.mc.obj.energy.energy_est = buffer[i + 7];
397 LOG_WARN(
"Unhandled DAG MC type: %u\n", (
unsigned)dio.mc.type);
401 case RPL_OPTION_ROUTE_INFO:
403 LOG_WARN(
"Invalid destination prefix option, len = %d\n", len);
404 RPL_STAT(rpl_stats.malformed_msgs++);
409 dio.destination_prefix.length = buffer[i + 2];
410 dio.destination_prefix.flags = buffer[i + 3];
411 dio.destination_prefix.lifetime = get32(buffer, i + 4);
413 if(((dio.destination_prefix.length + 7) / 8) + 8 <= len &&
414 dio.destination_prefix.length <= 128) {
415 LOG_INFO(
"Copying destination prefix\n");
416 memcpy(&dio.destination_prefix.prefix, &buffer[i + 8],
417 (dio.destination_prefix.length + 7) / 8);
419 LOG_WARN(
"Invalid route info option, len = %d\n", len);
420 RPL_STAT(rpl_stats.malformed_msgs++);
425 case RPL_OPTION_DAG_CONF:
427 LOG_WARN(
"Invalid DAG configuration option, len = %d\n", len);
428 RPL_STAT(rpl_stats.malformed_msgs++);
433 dio.dag_intdoubl = buffer[i + 3];
434 dio.dag_intmin = buffer[i + 4];
435 dio.dag_redund = buffer[i + 5];
436 dio.dag_max_rankinc = get16(buffer, i + 6);
437 dio.dag_min_hoprankinc = get16(buffer, i + 8);
438 dio.ocp = get16(buffer, i + 10);
440 dio.default_lifetime = buffer[i + 13];
441 dio.lifetime_unit = get16(buffer, i + 14);
442 LOG_INFO(
"DAG conf:dbl=%d, min=%d red=%d maxinc=%d mininc=%d ocp=%d d_l=%u l_u=%u\n",
443 dio.dag_intdoubl, dio.dag_intmin, dio.dag_redund,
444 dio.dag_max_rankinc, dio.dag_min_hoprankinc, dio.ocp,
445 dio.default_lifetime, dio.lifetime_unit);
447 case RPL_OPTION_PREFIX_INFO:
449 LOG_WARN(
"Invalid DAG prefix info, len != 32\n");
450 RPL_STAT(rpl_stats.malformed_msgs++);
453 dio.prefix_info.length = buffer[i + 2];
455 if(dio.prefix_info.length >
sizeof(uip_ipaddr_t) * 8) {
456 LOG_WARN(
"Invalid DAG prefix info, len %u > %u\n",
457 dio.prefix_info.length, (
unsigned)(
sizeof(uip_ipaddr_t) * 8));
458 RPL_STAT(rpl_stats.malformed_msgs++);
462 dio.prefix_info.flags = buffer[i + 3];
465 dio.prefix_info.lifetime = get32(buffer, i + 8);
467 LOG_INFO(
"Copying prefix information\n");
468 memcpy(&dio.prefix_info.prefix, &buffer[i + 16], 16);
471 LOG_WARN(
"Unsupported suboption type in DIO: %u\n",
472 (
unsigned)subopt_type);
476#ifdef RPL_DEBUG_DIO_INPUT
477 RPL_DEBUG_DIO_INPUT(&from, &dio);
489 unsigned char *buffer;
500 if(uc_addr == NULL) {
501 LOG_DBG(
"LEAF ONLY have multicast addr: skip dio_output\n");
509 buffer = UIP_ICMP_PAYLOAD;
510 buffer[pos++] = instance->instance_id;
511 buffer[pos++] = dag->version;
512 is_root = (dag->rank ==
ROOT_RANK(instance));
515 LOG_DBG(
"LEAF ONLY DIO rank set to RPL_INFINITE_RANK\n");
516 set16(buffer, pos, RPL_INFINITE_RANK);
518 set16(buffer, pos, dag->rank);
524 buffer[pos] |= RPL_DIO_GROUNDED;
527 buffer[pos] |= instance->mop << RPL_DIO_MOP_SHIFT;
528 buffer[pos] |= dag->preference & RPL_DIO_PREFERENCE_MASK;
531 buffer[pos++] = instance->dtsn_out;
533 if(RPL_DIO_REFRESH_DAO_ROUTES && is_root && uc_addr == NULL) {
539 RPL_LOLLIPOP_INCREMENT(instance->dtsn_out);
546 memcpy(buffer + pos, &dag->dag_id,
sizeof(dag->dag_id));
550 if(instance->mc.type != RPL_DAG_MC_NONE) {
551 instance->of->update_metric_container(instance);
553 buffer[pos++] = RPL_OPTION_DAG_METRIC_CONTAINER;
555 buffer[pos++] = instance->mc.type;
556 buffer[pos++] = instance->mc.flags >> 1;
557 buffer[pos] = (instance->mc.flags & 1) << 7;
558 buffer[pos++] |= (instance->mc.aggr << 4) | instance->mc.prec;
559 if(instance->mc.type == RPL_DAG_MC_ETX) {
561 set16(buffer, pos, instance->mc.obj.etx);
563 }
else if(instance->mc.type == RPL_DAG_MC_ENERGY) {
565 buffer[pos++] = instance->mc.obj.energy.flags;
566 buffer[pos++] = instance->mc.obj.energy.energy_est;
568 LOG_ERR(
"Unable to send DIO because of unhandled DAG MC type %u\n",
569 (
unsigned)instance->mc.type);
576 buffer[pos++] = RPL_OPTION_DAG_CONF;
579 buffer[pos++] = instance->dio_intdoubl;
580 buffer[pos++] = instance->dio_intmin;
581 buffer[pos++] = instance->dio_redundancy;
582 set16(buffer, pos, instance->max_rankinc);
584 set16(buffer, pos, instance->min_hoprankinc);
587 set16(buffer, pos, instance->of->ocp);
590 buffer[pos++] = instance->default_lifetime;
591 set16(buffer, pos, instance->lifetime_unit);
595 if(dag->prefix_info.length > 0) {
596 buffer[pos++] = RPL_OPTION_PREFIX_INFO;
598 buffer[pos++] = dag->prefix_info.length;
599 buffer[pos++] = dag->prefix_info.flags;
600 set32(buffer, pos, dag->prefix_info.lifetime);
602 set32(buffer, pos, dag->prefix_info.lifetime);
604 memset(&buffer[pos], 0, 4);
606 memcpy(&buffer[pos], &dag->prefix_info.prefix, 16);
608 LOG_DBG(
"Sending prefix info in DIO for ");
609 LOG_DBG_6ADDR(&dag->prefix_info.prefix);
612 LOG_DBG(
"No prefix to announce (len %d)\n",
613 dag->prefix_info.length);
617 if(LOG_DBG_ENABLED) {
618 if(uc_addr == NULL) {
619 LOG_DBG(
"LEAF ONLY sending unicast-DIO from multicast-DIO\n");
623 LOG_INFO(
"Sending unicast-DIO with rank %u to ", (
unsigned)dag->rank);
624 LOG_INFO_6ADDR(uc_addr);
629 if(uc_addr == NULL) {
630 LOG_INFO(
"Sending a multicast-DIO with rank %u\n",
631 (
unsigned)instance->current_dag->rank);
635 LOG_INFO(
"Sending unicast-DIO with rank %u to ",
636 (
unsigned)instance->current_dag->rank);
637 LOG_INFO_6ADDR(uc_addr);
645dao_input_storing(
void)
648 uip_ipaddr_t dao_sender_addr;
651 unsigned char *buffer;
664 rpl_parent_t *parent;
670 memset(&prefix, 0,
sizeof(prefix));
674 buffer = UIP_ICMP_PAYLOAD;
675 uint16_t buffer_length =
uip_len - uip_l3_icmp_hdr_len;
676 if(buffer_length < 4) {
677 LOG_WARN(
"Dropping incomplete DAO (%"PRIu16
" < %d)\n",
682 uint16_t last_valid_pos = buffer_length - 1;
685 instance_id = buffer[pos++];
686 instance = rpl_get_instance(instance_id);
687 if(instance == NULL) {
688 LOG_ERR(
"Cannot get RPL instance\n");
692 lifetime = instance->default_lifetime;
694 flags = buffer[pos++];
697 sequence = buffer[pos++];
699 dag = instance->current_dag;
700 is_root = (dag->rank ==
ROOT_RANK(instance));
703 if(flags & RPL_DAO_D_FLAG) {
704 if(last_valid_pos < pos + 16) {
705 LOG_WARN(
"Dropping incomplete DAO (%"PRIu16
" < %d)\n",
706 last_valid_pos, pos + 16);
710 if(memcmp(&dag->dag_id, &buffer[pos],
sizeof(dag->dag_id))) {
711 LOG_INFO(
"Ignoring a DAO for a DAG different from ours\n");
718 RPL_ROUTE_FROM_MULTICAST_DAO : RPL_ROUTE_FROM_UNICAST_DAO;
721 LOG_DBG(
"Received a (%s) DAO with sequence number %u from ",
722 learned_from == RPL_ROUTE_FROM_UNICAST_DAO ?
"unicast" :
"multicast",
724 LOG_DBG_6ADDR(&dao_sender_addr);
727 if(learned_from == RPL_ROUTE_FROM_UNICAST_DAO) {
729 parent = rpl_find_parent(dag, &dao_sender_addr);
734 LOG_WARN(
"Loop detected when receiving a unicast DAO from a node with a lower rank! (%u < %u)\n",
736 parent->rank = RPL_INFINITE_RANK;
737 parent->flags |= RPL_PARENT_FLAG_UPDATED;
742 if(parent != NULL && parent == dag->preferred_parent) {
743 LOG_WARN(
"Loop detected when receiving a unicast DAO from our parent\n");
744 parent->rank = RPL_INFINITE_RANK;
745 parent->flags |= RPL_PARENT_FLAG_UPDATED;
751 for(i = pos; i < buffer_length; i += len) {
752 subopt_type = buffer[i];
753 if(subopt_type == RPL_OPTION_PAD1) {
757 if(last_valid_pos < i + 1) {
758 LOG_WARN(
"Dropping incomplete DAO (%"PRIu16
" < %d)\n",
759 last_valid_pos, i + 1);
762 len = 2 + buffer[i + 1];
765 switch(subopt_type) {
766 case RPL_OPTION_TARGET:
768 if(last_valid_pos < i + 3) {
769 LOG_WARN(
"Dropping incomplete DAO (%"PRIu16
" < %d)\n",
770 last_valid_pos, i + 3);
773 prefixlen = buffer[i + 3];
778 if(prefixlen > 128) {
779 LOG_ERR(
"Too large target prefix length %d\n", prefixlen);
782 if(i + 4 + ((prefixlen + 7) / CHAR_BIT) > buffer_length) {
783 LOG_ERR(
"Incomplete DAO target option with prefix length of %d bits\n",
787 memset(&prefix, 0,
sizeof(prefix));
788 memcpy(&prefix, buffer + i + 4, (prefixlen + 7) / CHAR_BIT);
790 case RPL_OPTION_TRANSIT:
794 if(last_valid_pos < i + 5) {
795 LOG_WARN(
"Dropping incomplete DAO (%"PRIu16
" < %d)\n",
796 last_valid_pos, i + 5);
799 lifetime = buffer[i + 5];
805 LOG_INFO(
"DAO lifetime: %u, prefix length: %u prefix: ",
806 (
unsigned)lifetime, (
unsigned)prefixlen);
807 LOG_INFO_6ADDR(&prefix);
810#if RPL_WITH_MULTICAST
819 mcast_group->
dag = dag;
826 rep = uip_ds6_route_lookup(&prefix);
828 if(lifetime == RPL_ZERO_LIFETIME) {
829 LOG_INFO(
"No-Path DAO received\n");
832 !RPL_ROUTE_IS_NOPATH_RECEIVED(rep) &&
833 rep->length == prefixlen &&
834 uip_ds6_route_nexthop(rep) != NULL &&
835 uip_ipaddr_cmp(uip_ds6_route_nexthop(rep), &dao_sender_addr)) {
836 LOG_DBG(
"Setting expiration timer for prefix ");
837 LOG_DBG_6ADDR(&prefix);
839 RPL_ROUTE_SET_NOPATH_RECEIVED(rep);
840 rep->state.lifetime = RPL_NOPATH_REMOVAL_DELAY;
844 if(dag->preferred_parent != NULL &&
845 rpl_parent_get_ipaddr(dag->preferred_parent) != NULL) {
847 out_seq = prepare_for_dao_fwd(sequence, rep);
849 LOG_DBG(
"Forwarding No-path DAO out_seq:%d to parent ", out_seq);
850 LOG_DBG_6ADDR(rpl_parent_get_ipaddr(dag->preferred_parent));
853 buffer = UIP_ICMP_PAYLOAD;
860 if(flags & RPL_DAO_K_FLAG) {
863 dao_ack_output(instance, &dao_sender_addr, sequence,
864 RPL_DAO_ACK_UNCONDITIONAL_ACCEPT);
869 LOG_INFO(
"Adding DAO route\n");
873 NBR_TABLE_REASON_RPL_DAO, instance);
875 LOG_ERR(
"Out of memory, dropping DAO from ");
876 LOG_ERR_6ADDR(&dao_sender_addr);
878 LOG_ERR_LLADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
880 if(flags & RPL_DAO_K_FLAG) {
882 dao_ack_output(instance, &dao_sender_addr, sequence,
883 is_root ? RPL_DAO_ACK_UNABLE_TO_ADD_ROUTE_AT_ROOT :
884 RPL_DAO_ACK_UNABLE_TO_ACCEPT);
889 rep = rpl_add_route(dag, &prefix, prefixlen, &dao_sender_addr);
891 RPL_STAT(rpl_stats.mem_overflows++);
892 LOG_ERR(
"Could not add a route after receiving a DAO\n");
893 if(flags & RPL_DAO_K_FLAG) {
895 dao_ack_output(instance, &dao_sender_addr, sequence,
896 is_root ? RPL_DAO_ACK_UNABLE_TO_ADD_ROUTE_AT_ROOT :
897 RPL_DAO_ACK_UNABLE_TO_ACCEPT);
904 RPL_ROUTE_CLEAR_NOPATH_RECEIVED(rep);
906#if RPL_WITH_MULTICAST
910 if(learned_from == RPL_ROUTE_FROM_UNICAST_DAO) {
913 if(flags & RPL_DAO_K_FLAG) {
922 if((!RPL_ROUTE_IS_DAO_PENDING(rep) &&
923 rep->state.dao_seqno_in == sequence) ||
930 if(dag->preferred_parent != NULL &&
931 rpl_parent_get_ipaddr(dag->preferred_parent) != NULL) {
936 if(RPL_ROUTE_IS_DAO_PENDING(rep) &&
937 rep->state.dao_seqno_in == sequence) {
939 out_seq = rep->state.dao_seqno_out;
941 out_seq = prepare_for_dao_fwd(sequence, rep);
945 LOG_DBG(
"Forwarding DAO to parent ");
946 LOG_DBG_6ADDR(rpl_parent_get_ipaddr(dag->preferred_parent));
947 LOG_DBG_(
" in seq: %d out seq: %d\n", sequence, out_seq);
949 buffer = UIP_ICMP_PAYLOAD;
955 LOG_DBG(
"Sending DAO ACK\n");
957 dao_ack_output(instance, &dao_sender_addr, sequence,
958 RPL_DAO_ACK_UNCONDITIONAL_ACCEPT);
965dao_input_nonstoring(
void)
967#if RPL_WITH_NON_STORING
968 uip_ipaddr_t dao_sender_addr;
969 uip_ipaddr_t dao_parent_addr;
972 unsigned char *buffer;
985 LOG_INFO(
"Received a DAO from ");
992 memset(&dao_parent_addr, 0, 16);
994 buffer = UIP_ICMP_PAYLOAD;
995 uint16_t buffer_length =
uip_len - uip_l3_icmp_hdr_len;
996 if(buffer_length < 4) {
997 LOG_WARN(
"Dropping incomplete DAO (%"PRIu16
" < %d)\n",
1002 uint16_t last_valid_pos = buffer_length - 1;
1005 instance_id = buffer[pos++];
1006 instance = rpl_get_instance(instance_id);
1007 lifetime = instance->default_lifetime;
1009 flags = buffer[pos++];
1012 sequence = buffer[pos++];
1014 dag = instance->current_dag;
1016 if(flags & RPL_DAO_D_FLAG) {
1017 if(pos +
sizeof(dag->dag_id) > buffer_length) {
1018 LOG_WARN(
"Insufficient data to read DAG ID from DAO\n");
1021 if(memcmp(&dag->dag_id, &buffer[pos],
sizeof(dag->dag_id))) {
1022 LOG_INFO(
"Ignoring a DAO for a DAG different from ours\n");
1029 for(i = pos; i < buffer_length; i += len) {
1030 subopt_type = buffer[i];
1031 if(subopt_type == RPL_OPTION_PAD1) {
1035 if(last_valid_pos < i + 1) {
1036 LOG_WARN(
"Dropping incomplete DAO (%"PRIu16
" < %d)\n",
1037 last_valid_pos, i + 1);
1040 len = 2 + buffer[i + 1];
1043 switch(subopt_type) {
1044 case RPL_OPTION_TARGET:
1046 if(last_valid_pos < i + 3) {
1047 LOG_WARN(
"Dropping incomplete DAO (%"PRIu16
" < %d)\n",
1048 last_valid_pos, i + 3);
1051 prefixlen = buffer[i + 3];
1052 if(prefixlen == 0) {
1056 if(prefixlen > 128) {
1057 LOG_ERR(
"Too large target prefix length %d\n", prefixlen);
1060 if(i + 4 + ((prefixlen + 7) / CHAR_BIT) > buffer_length) {
1061 LOG_ERR(
"Incomplete DAO target option with prefix length of %d bits\n",
1066 memset(&prefix, 0,
sizeof(prefix));
1067 memcpy(&prefix, buffer + i + 4, (prefixlen + 7) / CHAR_BIT);
1069 case RPL_OPTION_TRANSIT:
1073 if(i + 6 + 16 > buffer_length) {
1074 LOG_WARN(
"Incomplete DAO transit option (%d > %"PRIu16
")\n",
1075 i + 6 + 16, buffer_length);
1078 lifetime = buffer[i + 5];
1080 memcpy(&dao_parent_addr, buffer + i + 6, 16);
1086 LOG_INFO(
"DAO lifetime: %u, prefix length: %u prefix: ",
1087 (
unsigned)lifetime, (
unsigned)prefixlen);
1088 LOG_INFO_6ADDR(&prefix);
1089 LOG_INFO_(
", parent: ");
1090 LOG_INFO_6ADDR(&dao_parent_addr);
1093 if(lifetime == RPL_ZERO_LIFETIME) {
1094 LOG_DBG(
"No-Path DAO received\n");
1099 LOG_WARN(
"DAO failed to add link prefix: ");
1100 LOG_WARN_6ADDR(&prefix);
1101 LOG_WARN_(
", parent: ");
1102 LOG_WARN_6ADDR(&dao_parent_addr);
1108 if(flags & RPL_DAO_K_FLAG) {
1109 LOG_DBG(
"Sending DAO ACK\n");
1111 dao_ack_output(instance, &dao_sender_addr, sequence,
1112 RPL_DAO_ACK_UNCONDITIONAL_ACCEPT);
1121 uint8_t instance_id;
1124 LOG_INFO(
"Received a DAO from ");
1128 if(
uip_len <= uip_l3_icmp_hdr_len) {
1129 LOG_WARN(
"Ignoring DAO ICMPv6 message without DAO header\n");
1133 instance_id = UIP_ICMP_PAYLOAD[0];
1134 instance = rpl_get_instance(instance_id);
1135 if(instance == NULL) {
1136 LOG_INFO(
"Ignoring a DAO for an unknown RPL instance(%u)\n",
1141 if(RPL_IS_STORING(instance)) {
1142 dao_input_storing();
1143 }
else if(RPL_IS_NON_STORING(instance)) {
1144 dao_input_nonstoring();
1153handle_dao_retransmission(
void *ptr)
1155 rpl_parent_t *parent;
1156 uip_ipaddr_t prefix;
1160 if(parent == NULL || parent->dag == NULL || parent->dag->instance == NULL) {
1163 instance = parent->dag->instance;
1165 if(instance->my_dao_transmissions >= RPL_DAO_MAX_RETRANSMISSIONS) {
1167 if(instance->lifetime_unit == 0xffff && instance->default_lifetime == 0xff) {
1178 if(RPL_IS_STORING(instance) && instance->of->dao_ack_callback) {
1180 instance->of->dao_ack_callback(parent, RPL_DAO_ACK_TIMEOUT);
1188 LOG_INFO(
"will retransmit DAO - seq:%d trans:%d\n", instance->my_dao_seqno,
1189 instance->my_dao_transmissions);
1191 if(get_global_addr(&prefix) == 0) {
1196 RPL_DAO_RETRANSMISSION_TIMEOUT / 2 +
1197 (
random_rand() % (RPL_DAO_RETRANSMISSION_TIMEOUT / 2)),
1198 handle_dao_retransmission, parent);
1200 instance->my_dao_transmissions++;
1201 dao_output_target_seq(parent, &prefix,
1202 instance->default_lifetime, instance->my_dao_seqno);
1207dao_output(rpl_parent_t *parent, uint8_t lifetime)
1210 uip_ipaddr_t prefix;
1212 if(get_global_addr(&prefix) == 0) {
1213 LOG_ERR(
"No global address set for this node - suppressing DAO\n");
1217 if(parent == NULL || parent->dag == NULL || parent->dag->instance == NULL) {
1221 RPL_LOLLIPOP_INCREMENT(dao_sequence);
1229 if(lifetime != RPL_ZERO_LIFETIME) {
1231 instance = parent->dag->instance;
1233 instance->my_dao_seqno = dao_sequence;
1234 instance->my_dao_transmissions = 1;
1235 ctimer_set(&instance->dao_retransmit_timer, RPL_DAO_RETRANSMISSION_TIMEOUT,
1236 handle_dao_retransmission, parent);
1243 parent->dag->instance->has_downward_route = lifetime != RPL_ZERO_LIFETIME;
1247 dao_output_target(parent, &prefix, lifetime);
1251dao_output_target(rpl_parent_t *parent, uip_ipaddr_t *prefix, uint8_t lifetime)
1253 dao_output_target_seq(parent, prefix, lifetime, dao_sequence);
1257dao_output_target_seq(rpl_parent_t *parent, uip_ipaddr_t *prefix,
1258 uint8_t lifetime, uint8_t seq_no)
1262 unsigned char *buffer;
1265 uip_ipaddr_t *parent_ipaddr = NULL;
1266 uip_ipaddr_t *dest_ipaddr = NULL;
1275 if(parent == NULL) {
1276 LOG_ERR(
"dao_output_target error parent NULL\n");
1280 parent_ipaddr = rpl_parent_get_ipaddr(parent);
1281 if(parent_ipaddr == NULL) {
1282 LOG_ERR(
"dao_output_target error parent IP address NULL\n");
1288 LOG_ERR(
"dao_output_target error dag NULL\n");
1292 instance = dag->instance;
1294 if(instance == NULL) {
1295 LOG_ERR(
"dao_output_target error instance NULL\n");
1298 if(prefix == NULL) {
1299 LOG_ERR(
"dao_output_target error prefix NULL\n");
1302#ifdef RPL_DEBUG_DAO_OUTPUT
1303 RPL_DEBUG_DAO_OUTPUT(parent);
1306 buffer = UIP_ICMP_PAYLOAD;
1309 buffer[pos++] = instance->instance_id;
1311#if RPL_DAO_SPECIFY_DAG
1312 buffer[pos] |= RPL_DAO_D_FLAG;
1315 if(lifetime != RPL_ZERO_LIFETIME) {
1316 buffer[pos] |= RPL_DAO_K_FLAG;
1321 buffer[pos++] = seq_no;
1322#if RPL_DAO_SPECIFY_DAG
1323 memcpy(buffer + pos, &dag->dag_id,
sizeof(dag->dag_id));
1324 pos +=
sizeof(dag->dag_id);
1328 prefixlen =
sizeof(*prefix) * CHAR_BIT;
1329 buffer[pos++] = RPL_OPTION_TARGET;
1330 buffer[pos++] = 2 + ((prefixlen + 7) / CHAR_BIT);
1332 buffer[pos++] = prefixlen;
1333 memcpy(buffer + pos, prefix, (prefixlen + 7) / CHAR_BIT);
1334 pos += ((prefixlen + 7) / CHAR_BIT);
1337 buffer[pos++] = RPL_OPTION_TRANSIT;
1338 buffer[pos++] = (instance->mop != RPL_MOP_NON_STORING) ? 4 : 20;
1342 buffer[pos++] = lifetime;
1344 if(instance->mop != RPL_MOP_NON_STORING) {
1346 dest_ipaddr = parent_ipaddr;
1349 memcpy(buffer + pos, &parent->dag->dag_id, 8);
1352 memcpy(buffer + pos, ((
const unsigned char *)parent_ipaddr) + 8, 8);
1355 dest_ipaddr = &parent->dag->dag_id;
1358 LOG_INFO(
"Sending a %sDAO with sequence number %u, lifetime %u, prefix ",
1359 lifetime == RPL_ZERO_LIFETIME ?
"No-Path " :
"", seq_no, lifetime);
1361 LOG_INFO_6ADDR(prefix);
1363 LOG_INFO_6ADDR(dest_ipaddr);
1364 LOG_INFO_(
" , parent ");
1365 LOG_INFO_6ADDR(parent_ipaddr);
1368 if(dest_ipaddr != NULL) {
1379 uint8_t instance_id;
1383 rpl_parent_t *parent;
1385 buffer = UIP_ICMP_PAYLOAD;
1387 instance_id = buffer[0];
1388 sequence = buffer[2];
1391 instance = rpl_get_instance(instance_id);
1392 if(instance == NULL) {
1397 if(RPL_IS_STORING(instance)) {
1398 parent = rpl_find_parent(instance->current_dag, &
UIP_IP_BUF->srcipaddr);
1399 if(parent == NULL) {
1408 if(instance->current_dag->rank ==
ROOT_RANK(instance)) {
1409 LOG_DBG(
"DODAG root received a DAO ACK, ignoring it\n");
1414 LOG_INFO(
"Received a DAO %s with sequence number %u (%u) and status %u from ",
1415 status < 128 ?
"ACK" :
"NACK",
1416 sequence, instance->my_dao_seqno, status);
1420 if(sequence == instance->my_dao_seqno) {
1421 instance->has_downward_route = status < 128;
1427 if(RPL_IS_STORING(instance) && instance->of->dao_ack_callback) {
1428 instance->of->dao_ack_callback(parent, status);
1431#if RPL_REPAIR_ON_DAO_NACK
1432 if(status >= RPL_DAO_ACK_UNABLE_TO_ACCEPT) {
1440 }
else if(RPL_IS_STORING(instance)) {
1443 const uip_ipaddr_t *nexthop;
1444 if((re = find_route_entry_by_dao_ack(sequence)) != NULL) {
1447 RPL_ROUTE_CLEAR_DAO_PENDING(re);
1449 nexthop = uip_ds6_route_nexthop(re);
1450 if(nexthop == NULL) {
1451 LOG_WARN(
"No next hop to fwd DAO ACK to\n");
1453 LOG_INFO(
"Fwd DAO ACK to:");
1454 LOG_INFO_6ADDR(nexthop);
1456 buffer[2] = re->state.dao_seqno_in;
1460 if(status >= RPL_DAO_ACK_UNABLE_TO_ACCEPT) {
1462 uip_ds6_route_rm(re);
1465 LOG_WARN(
"No route entry found to forward DAO ACK (seqno %u)\n",
1474dao_ack_output(
rpl_instance_t *instance, uip_ipaddr_t *dest, uint8_t sequence,
1478 unsigned char *buffer;
1480 LOG_INFO(
"Sending a DAO %s with sequence number %u to ",
1481 status < 128 ?
"ACK" :
"NACK", sequence);
1482 LOG_INFO_6ADDR(dest);
1483 LOG_INFO_(
" with status %u\n", status);
1485 buffer = UIP_ICMP_PAYLOAD;
1487 buffer[0] = instance->instance_id;
1489 buffer[2] = sequence;
1497rpl_icmp6_register_handlers(
void)
unsigned short random_rand(void)
Generates a new random number using the cc2538 RNG.
void ctimer_stop(struct ctimer *c)
Stop a pending callback timer.
void ctimer_set(struct ctimer *c, clock_time_t t, void(*f)(void *), void *ptr)
Set a callback timer.
#define uip_create_linklocal_rplnodes_mcast(addr)
Set IP address addr to the link-local, all-rpl-nodes multicast address.
#define RPL_LIFETIME(lifetime)
Compute lifetime, accounting for the lifetime unit.
#define DAG_RANK(fixpt_rank)
Return DAG RANK as per RFC 6550 (rank divided by min_hoprankinc)
void rpl_local_repair(const char *str)
Triggers a RPL local repair.
#define ROOT_RANK
Rank of a root node.
uip_mcast6_route_t * uip_mcast6_route_add(uip_ipaddr_t *group)
Add a multicast route.
void uip_sr_expire_parent(const void *graph, const uip_ipaddr_t *child, const uip_ipaddr_t *parent)
Expires a given child-parent link.
uip_ds6_nbr_t * uip_ds6_nbr_add(const uip_ipaddr_t *ipaddr, const uip_lladdr_t *lladdr, uint8_t isrouter, uint8_t state, nbr_table_reason_t reason, void *data)
Add a neighbor cache for a specified IPv6 address, which is associated with a specified link-layer ad...
void uip_icmp6_send(const uip_ipaddr_t *dest, int type, int code, int payload_len)
Send an icmpv6 message.
rpl_dag_t * rpl_get_any_dag(void)
Returns pointer to any DAG (for compatibility with legagy RPL code)
uip_ds6_nbr_t * uip_ds6_nbr_lookup(const uip_ipaddr_t *ipaddr)
Get the neighbor cache associated with a specified IPv6 address.
#define uip_is_addr_mcast(a)
is address a multicast address, see RFC 4291 a is of type uip_ipaddr_t*
uip_ds6_nbr_t * rpl_icmp6_update_nbr_table(uip_ipaddr_t *from, nbr_table_reason_t reason, void *data)
Updates IPv6 neighbor cache on incoming link-local RPL ICMPv6 messages.
enum rpl_mode rpl_get_mode(void)
Get the RPL mode.
#define uip_is_addr_linklocal(a)
is addr (a) a link local unicast address, see RFC 4291 i.e.
void rpl_process_dio(uip_ipaddr_t *from, rpl_dio_t *dio)
Processes incoming DIO.
#define uip_is_addr_mcast_global(a)
is address a global multicast address (FFxE::/16), a is of type uip_ip6addr_t*
void uip_icmp6_register_input_handler(uip_icmp6_input_handler_t *handler)
Register a handler which can handle a specific ICMPv6 message type.
uip_sr_node_t * uip_sr_update_node(void *graph, const uip_ipaddr_t *child, const uip_ipaddr_t *parent, uint32_t lifetime)
Updates a child-parent link.
uip_ds6_netif_t uip_ds6_if
The single interface.
#define UIP_IP_BUF
Direct access to IPv6 header.
#define uip_ipaddr_copy(dest, src)
Copy an IP address from one place to another.
uint16_t uip_len
The length of the packet in the uip_buf buffer.
Header file for the logging system.
Header file for the Packet buffer (packetbuf) management.
The default nbr_table entry (when UIP_DS6_NBR_MULTI_IPV6_ADDRS is disabled), that implements nbr cach...
An entry in the routing table.
An entry in the multicast routing table.
void * dag
Pointer to an rpl_dag_t struct.
uint32_t lifetime
Entry lifetime seconds.
Header for the Contiki/uIP interface.
Header file for IPv6-related data structures.
Header file for ICMPv6 message and error handing (RFC 4443)
This header file contains configuration directives for uIPv6 multicast support.
static uip_ds6_nbr_t * nbr
Pointer to llao option in uip_buf.
static uip_ds6_addr_t * addr
Pointer to a nbr cache entry.
Header file for IPv6 Neighbor discovery (RFC 4861)
Header file for the uIP TCP/IP stack.