ng_rpl: auto address configuration

sys/include/net/ng_rpl/structs.h

@@ -147,6 +147,23 @@ typedef struct __attribute__((packed)) {
  uint8_t path_lifetime; /**< lifetime of routes */
 } ng_rpl_opt_transit_t;
 
+/**
+ * @brief Prefix Information Option
+ * @see <a href="https://tools.ietf.org/html/rfc6550#section-6.7.10">
+ * Prefix Information
+ * </a>
+ */
+typedef struct __attribute__((packed)) {
+ uint8_t type; /**< option type */
+ uint8_t length; /**< option length without the first two bytes */
+ uint8_t prefix_len; /**< prefix length */
+ uint8_t LAR_flags; /**< flags and resereved */
+ uint32_t valid_lifetime; /**< valid lifetime */
+ uint32_t pref_lifetime; /**< preferred lifetime */
+ uint32_t reserved; /**< reserved */
+ ng_ipv6_addr_t prefix; /**< prefix */
+} ng_rpl_opt_prefix_info_t;
+
 typedef struct ng_rpl_dodag ng_rpl_dodag_t;
 typedef struct ng_rpl_parent ng_rpl_parent_t;
 

sys/net/routing/ng_rpl/ng_rpl_control_messages.c

@@ -14,6 +14,7 @@
  */
 #include "net/ng_rpl.h"
 #include "inet_ntop.h"
+#include "net/eui64.h"
 
 #define ENABLE_DEBUG (0)
 #include "debug.h"
@@ -25,6 +26,7 @@ static char addr_str[NG_IPV6_ADDR_MAX_STR_LEN];
 #define NG_RPL_GROUNDED_SHIFT (7)
 #define NG_RPL_MOP_SHIFT (3)
 #define NG_RPL_OPT_DODAG_CONF_LEN (14)
+#define NG_RPL_OPT_PREFIX_INFO_LEN (30)
 #define NG_RPL_SHIFTED_MOP_MASK (0x7)
 #define NG_RPL_PRF_MASK (0x7)
 
@@ -81,11 +83,13 @@ void ng_rpl_send_DIO(ng_rpl_dodag_t *dodag, ng_ipv6_addr_t *destination)
  ng_icmpv6_hdr_t *icmp;
  ng_rpl_dio_t *dio;
  ng_rpl_opt_dodag_conf_t *dodag_conf;
+ ng_rpl_opt_prefix_info_t *prefix_info;
  uint8_t *pos;
  int size = sizeof(ng_icmpv6_hdr_t) + sizeof(ng_rpl_dio_t);
 
  if ((dodag->dodag_conf_counter % 3) == 0) {
  size += sizeof(ng_rpl_opt_dodag_conf_t);
+ size += sizeof(ng_rpl_opt_prefix_info_t);
  }
 
  if ((pkt = ng_icmpv6_build(NULL, NG_ICMPV6_RPL_CTRL, NG_RPL_ICMPV6_CODE_DIO, size)) == NULL) {
@@ -123,6 +127,19 @@ void ng_rpl_send_DIO(ng_rpl_dodag_t *dodag, ng_ipv6_addr_t *destination)
  dodag_conf->default_lifetime = dodag->default_lifetime;
  dodag_conf->lifetime_unit = byteorder_htons(dodag->lifetime_unit);
  pos += sizeof(*dodag_conf);
+
+ prefix_info = (ng_rpl_opt_prefix_info_t *) pos;
+ prefix_info->type = NG_RPL_OPT_PREFIX_INFO;
+ prefix_info->length = NG_RPL_OPT_PREFIX_INFO_LEN;
+ /* auto-address configuration */
+ prefix_info->LAR_flags = (1 << 6);
+ prefix_info->valid_lifetime = 0xFFFFFFFF;
+ prefix_info->pref_lifetime = 0xFFFFFFFF;
+ prefix_info->prefix_len = 64;
+ prefix_info->reserved = 0;
+ memset(&prefix_info->prefix, 0, sizeof(prefix_info->prefix));
+ memcpy(&prefix_info->prefix, &dodag->dodag_id, prefix_info->prefix_len/8);
+ pos += sizeof(*prefix_info);
  }
 
  dodag->dodag_conf_counter++;
@@ -178,6 +195,7 @@ void _parse_options(ng_rpl_dodag_t *dodag, ng_rpl_opt_t *opt, uint16_t len, ng_i
 {
  uint16_t l = 0;
  ng_rpl_opt_target_t *first_target = NULL;
+ eui64_t iid;
  while(l < len) {
  switch(opt->type) {
  case (NG_RPL_OPT_PAD1): {
@@ -213,6 +231,20 @@ void _parse_options(ng_rpl_dodag_t *dodag, ng_rpl_opt_t *opt, uint16_t len, ng_i
  dodag->trickle.k = dodag->dio_redun;
  break;
  }
+ case (NG_RPL_OPT_PREFIX_INFO): {
+ DEBUG("RPL: Prefix Information DIO option parsed\n");
+ ng_rpl_opt_prefix_info_t *pi = (ng_rpl_opt_prefix_info_t *) opt;
+ kernel_pid_t if_id = ng_ipv6_netif_find_by_prefix(NULL, &dodag->dodag_id);
+ /* check for the auto address-configuration flag */
+ if ((ng_netapi_get(if_id, NETCONF_OPT_IPV6_IID, 0, &iid, sizeof(eui64_t)) < 0) &&
+ !(pi->LAR_flags & (1 << 6))) {
+ break;
+ }
+ ng_ipv6_addr_set_aiid(&pi->prefix, iid.uint8);
+ ng_ipv6_netif_add_addr(if_id, &pi->prefix, pi->prefix_len, 0);
+
+ break;
+ }
  case (NG_RPL_OPT_TARGET): {
  DEBUG("RPL: RPL TARGET DAO option parsed\n");
  ng_rpl_opt_target_t *target = (ng_rpl_opt_target_t *) opt;