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gnrc_ipv6_nib: provide internal implementation for off-link entries
This commit is contained in:
Martine Lenders
parent
a6fcbcde9c
commit
f249c0c2a0
@ -184,6 +184,16 @@ extern "C" {
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#define GNRC_IPV6_NIB_NUMOF (4)
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#endif
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/**
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* @brief Number of off-link entries in NIB
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*
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* @attention This number is equal to the maximum number of forwarding table
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* and prefix list entries in NIB
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*/
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#ifndef GNRC_IPV6_NIB_OFFL_NUMOF
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#define GNRC_IPV6_NIB_OFFL_NUMOF (8)
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#endif
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#ifdef __cplusplus
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}
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#endif
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@ -33,6 +33,7 @@ static _nib_dr_entry_t *_prime_def_router = NULL;
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static clist_node_t _next_removable = { NULL };
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static _nib_onl_entry_t _nodes[GNRC_IPV6_NIB_NUMOF];
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static _nib_offl_entry_t _dsts[GNRC_IPV6_NIB_OFFL_NUMOF];
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static _nib_dr_entry_t _def_routers[GNRC_IPV6_NIB_DEFAULT_ROUTER_NUMOF];
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static _nib_iface_t _nis[GNRC_NETIF_NUMOF];
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@ -53,33 +54,41 @@ void _nib_init(void)
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_next_removable.next = NULL;
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memset(_nodes, 0, sizeof(_nodes));
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memset(_def_routers, 0, sizeof(_def_routers));
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memset(_dsts, 0, sizeof(_dsts));
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memset(_nis, 0, sizeof(_nis));
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#endif
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/* TODO: load ABR information from persistent memory */
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}
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static inline bool _addr_equals(const ipv6_addr_t *addr,
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const _nib_onl_entry_t *node)
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{
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return (addr == NULL) || ipv6_addr_is_unspecified(&node->ipv6) ||
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(ipv6_addr_equal(addr, &node->ipv6));
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}
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_nib_onl_entry_t *_nib_onl_alloc(const ipv6_addr_t *addr, unsigned iface)
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{
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_nib_onl_entry_t *node = NULL;
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assert(addr != NULL);
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DEBUG("nib: Allocating on-link node entry (addr = %s, iface = %u)\n",
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ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)), iface);
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(addr == NULL) ? "NULL" : ipv6_addr_to_str(addr_str, addr,
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sizeof(addr_str)), iface);
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for (unsigned i = 0; i < GNRC_IPV6_NIB_NUMOF; i++) {
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_nib_onl_entry_t *tmp = &_nodes[i];
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if ((_nib_onl_get_if(tmp) == iface) &&
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(ipv6_addr_equal(addr, &tmp->ipv6))) {
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if ((_nib_onl_get_if(tmp) == iface) && _addr_equals(addr, tmp)) {
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/* exact match */
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DEBUG(" %p is an exact match\n", (void *)tmp);
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return tmp;
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node = tmp;
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break;
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}
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if ((node == NULL) && (tmp->mode == _EMPTY)) {
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DEBUG(" using %p\n", (void *)node);
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node = tmp;
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}
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}
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if (node != NULL) {
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DEBUG(" using %p\n", (void *)node);
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_override_node(addr, iface, node);
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}
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#if ENABLE_DEBUG
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@ -141,6 +150,7 @@ static inline _nib_onl_entry_t *_cache_out_onl_entry(const ipv6_addr_t *addr,
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_nib_onl_entry_t *_nib_nc_add(const ipv6_addr_t *addr, unsigned iface,
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uint16_t cstate)
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{
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assert(addr != NULL);
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cstate &= GNRC_IPV6_NIB_NC_INFO_NUD_STATE_MASK;
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assert(cstate != GNRC_IPV6_NIB_NC_INFO_NUD_STATE_DELAY);
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assert(cstate != GNRC_IPV6_NIB_NC_INFO_NUD_STATE_PROBE);
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@ -341,6 +351,95 @@ _nib_dr_entry_t *_nib_drl_get_dr(void)
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return _prime_def_router;
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}
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_nib_offl_entry_t *_nib_offl_alloc(const ipv6_addr_t *next_hop, unsigned iface,
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const ipv6_addr_t *pfx, unsigned pfx_len)
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{
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_nib_offl_entry_t *dst = NULL;
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assert((pfx != NULL) && (!ipv6_addr_is_unspecified(pfx)) &&
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(pfx_len > 0) && (pfx_len <= 128));
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DEBUG("nib: Allocating off-link-entry entry "
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"(next_hop = %s, iface = %u, ",
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(next_hop == NULL) ? "NULL" : ipv6_addr_to_str(addr_str, next_hop,
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sizeof(addr_str)),
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iface);
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DEBUG("pfx = %s/%u)\n", ipv6_addr_to_str(addr_str, pfx,
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sizeof(addr_str)), pfx_len);
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for (unsigned i = 0; i < GNRC_IPV6_NIB_OFFL_NUMOF; i++) {
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_nib_offl_entry_t *tmp = &_dsts[i];
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_nib_onl_entry_t *tmp_node = tmp->next_hop;
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if ((tmp->pfx_len == pfx_len) && /* prefix length matches and */
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(tmp_node != NULL) && /* there is a next hop that */
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(_nib_onl_get_if(tmp_node) == iface) && /* has a matching interface and */
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_addr_equals(next_hop, tmp_node) && /* equal address to next_hop, also */
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(ipv6_addr_match_prefix(&tmp->pfx, pfx) >= pfx_len)) { /* the prefix matches */
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/* exact match (or next hop address was previously unset) */
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DEBUG(" %p is an exact match\n", (void *)tmp);
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if (next_hop != NULL) {
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memcpy(&tmp_node->ipv6, next_hop, sizeof(tmp_node->ipv6));
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}
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tmp->next_hop->mode |= _DST;
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return tmp;
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}
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if ((dst == NULL) && (tmp_node == NULL)) {
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dst = tmp;
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}
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}
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if (dst != NULL) {
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DEBUG(" using %p\n", (void *)dst);
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dst->next_hop = _nib_onl_alloc(next_hop, iface);
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if (dst->next_hop == NULL) {
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memset(dst, 0, sizeof(_nib_offl_entry_t));
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return NULL;
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}
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_override_node(next_hop, iface, dst->next_hop);
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dst->next_hop->mode |= _DST;
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ipv6_addr_init_prefix(&dst->pfx, pfx, pfx_len);
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dst->pfx_len = pfx_len;
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}
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return dst;
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}
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static inline bool _in_dsts(const _nib_offl_entry_t *dst)
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{
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return (dst < (_dsts + GNRC_IPV6_NIB_OFFL_NUMOF));
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}
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void _nib_offl_clear(_nib_offl_entry_t *dst)
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{
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if (dst->next_hop != NULL) {
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_nib_offl_entry_t *ptr;
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for (ptr = _dsts; _in_dsts(ptr); ptr++) {
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/* there is another dst pointing to next-hop => only remove dst */
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if ((dst != ptr) && (dst->next_hop == ptr->next_hop)) {
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break;
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}
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}
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/* we iterated and found no further dst pointing to next-hop */
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if (!_in_dsts(ptr)) {
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dst->next_hop->mode &= ~(_DST);
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_nib_onl_clear(dst->next_hop);
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}
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memset(dst, 0, sizeof(_nib_offl_entry_t));
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}
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}
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_nib_offl_entry_t *_nib_offl_iter(const _nib_offl_entry_t *last)
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{
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for (const _nib_offl_entry_t *dst = (last) ? (last + 1) : _dsts;
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_in_dsts(dst);
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dst++) {
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if (dst->mode != _EMPTY) {
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/* const modifier provided to assure internal consistency.
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* Can now be discarded. */
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return (_nib_offl_entry_t *)dst;
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}
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}
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return NULL;
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}
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_nib_iface_t *_nib_iface_get(unsigned iface)
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{
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_nib_iface_t *ni = NULL;
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@ -367,7 +466,9 @@ static void _override_node(const ipv6_addr_t *addr, unsigned iface,
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_nib_onl_entry_t *node)
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{
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_nib_onl_clear(node);
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memcpy(&node->ipv6, addr, sizeof(node->ipv6));
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if (addr != NULL) {
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memcpy(&node->ipv6, addr, sizeof(node->ipv6));
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}
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_nib_onl_set_if(node, iface);
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}
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@ -19,6 +19,7 @@
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#ifndef PRIV_NIB_INTERNAL_H
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#define PRIV_NIB_INTERNAL_H
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#include <assert.h>
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#include <stdbool.h>
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#include <stdint.h>
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@ -48,6 +49,8 @@ extern "C" {
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#define _DRL (0x08) /**< default router list */
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#define _FT (0x10) /**< forwarding table */
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#define _DAD (0x20) /**< 6LoWPAN duplicate address detection table */
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#define _DST (0x40) /**< there is @ref _nib_offl_entry_t pointing
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to this @ref _nib_onl_entry_t */
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/** @} */
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/**
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@ -148,6 +151,8 @@ typedef struct {
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ipv6_addr_t pfx; /**< prefix to the destination */
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unsigned pfx_len; /**< prefix-length in bits of
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* _nib_onl_entry_t::pfx */
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uint8_t mode; /**< [mode](@ref net_gnrc_ipv6_nib_mode) of the
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* off-link entry */
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} _nib_offl_entry_t;
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/**
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@ -232,10 +237,8 @@ static inline void _nib_onl_set_if(_nib_onl_entry_t *node, unsigned iface)
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/**
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* @brief Creates or gets an existing on-link entry by address
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*
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* @pre `(addr != NULL)`.
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*
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* @param[in] addr An IPv6 address. May not be NULL.
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* *May also be a global address!*
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* @param[in] addr An IPv6 address. May be NULL (to be pointed to by a prefix
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* list entry). *May also be a global address!*
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* @param[in] iface The interface to the node.
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*
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* @return A new or existing on-link entry with _nib_onl_entry_t::ipv6 set to
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@ -286,7 +289,6 @@ _nib_onl_entry_t *_nib_onl_get(const ipv6_addr_t *addr, unsigned iface);
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/**
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* @brief Creates or gets an existing node from the neighbor cache by address
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*
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* @pre `(addr != NULL)`
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* @pre `((cstate & GNRC_IPV6_NIB_NC_INFO_NUD_STATE_MASK) !=
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* GNRC_IPV6_NIB_NC_INFO_NUD_STATE_DELAY)`
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* @pre `((cstate & GNRC_IPV6_NIB_NC_INFO_NUD_STATE_MASK) !=
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@ -294,7 +296,8 @@ _nib_onl_entry_t *_nib_onl_get(const ipv6_addr_t *addr, unsigned iface);
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* @pre `((cstate & GNRC_IPV6_NIB_NC_INFO_NUD_STATE_MASK) !=
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* GNRC_IPV6_NIB_NC_INFO_NUD_STATE_REACHABLE)`
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*
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* @param[in] addr The address of a node. May not be NULL.
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* @param[in] addr The address of a node. May be NULL for prefix list
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* entries.
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* @param[in] iface The interface to the node.
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* @param[in] cstate Creation state. State of the entry *if* the entry is
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* newly created.
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@ -333,6 +336,7 @@ void _nib_nc_set_reachable(_nib_onl_entry_t *node);
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*/
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static inline _nib_onl_entry_t *_nib_dad_add(const ipv6_addr_t *addr)
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{
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assert(addr != NULL);
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_nib_onl_entry_t *node = _nib_onl_alloc(addr, 0);
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if (node != NULL) {
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@ -412,11 +416,10 @@ _nib_dr_entry_t *_nib_drl_get_dr(void);
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/**
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* @brief Creates or gets an existing off-link entry by next hop and prefix
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*
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* @pre `(next_hop != NULL)`
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* @pre `(pfx != NULL) && (pfx != "::") && (pfx_len != 0) && (pfx_len <= 128)`
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*
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* @param[in] next_hop An IPv6 address to next hop. May not be NULL.
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* *May also be a global address!*
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* @param[in] next_hop An IPv6 address to next hop. May be NULL (for prefix
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* list). *May also be a global address!*
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* @param[in] iface The interface to @p next_hop.
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* @param[in] pfx The IPv6 prefix or address of the destination.
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* May not be NULL or unspecified address. Use
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@ -427,15 +430,15 @@ _nib_dr_entry_t *_nib_drl_get_dr(void);
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* @p pfx.
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* @return NULL, if no space is left.
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*/
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_nib_offl_entry_t *_nib_dst_alloc(const ipv6_addr_t *next_hop, unsigned iface,
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const ipv6_addr_t *pfx, unsigned pfx_len);
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_nib_offl_entry_t *_nib_offl_alloc(const ipv6_addr_t *next_hop, unsigned iface,
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const ipv6_addr_t *pfx, unsigned pfx_len);
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/**
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* @brief Clears out a NIB entry (off-link version)
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*
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* @param[in,out] dst An entry.
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*/
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void _nib_dst_clear(_nib_offl_entry_t *dst);
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void _nib_offl_clear(_nib_offl_entry_t *dst);
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/**
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* @brief Iterates over off-link entries
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@ -444,16 +447,15 @@ void _nib_dst_clear(_nib_offl_entry_t *dst);
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*
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* @return entry after @p last.
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*/
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_nib_offl_entry_t *_nib_dst_iter(const _nib_offl_entry_t *last);
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_nib_offl_entry_t *_nib_offl_iter(const _nib_offl_entry_t *last);
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/**
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* @brief Helper function for view-level add-functions below
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*
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* @pre `(next_hop != NULL)`
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* @pre `(pfx != NULL) && (pfx != "::") && (pfx_len != 0) && (pfx_len <= 128)`
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*
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* @param[in] next_hop Next hop to the destination. May not be NULL.
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* *May also be a global address!*
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* @param[in] next_hop An IPv6 address to next hop. May be NULL (for prefix
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* list). *May also be a global address!*
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* @param[in] iface The interface to the destination.
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* @param[in] pfx The IPv6 prefix or address of the destination.
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* May not be NULL or unspecified address. Use
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@ -461,19 +463,19 @@ _nib_offl_entry_t *_nib_dst_iter(const _nib_offl_entry_t *last);
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* @param[in] pfx_len The length in bits of @p pfx in bits.
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* @param[in] mode [NIB-mode](_nib_onl_entry_t::mode).
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*
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* @return A new or existing off-link entry with _nib_dr_entry_t::pfx set to
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* @return A new or existing off-link entry with _nib_offl_entry_t::pfx set to
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* @p pfx.
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* @return NULL, if no space is left.
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*/
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static inline _nib_offl_entry_t *_nib_dst_add(const ipv6_addr_t *next_hop,
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unsigned iface,
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const ipv6_addr_t *pfx,
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unsigned pfx_len, uint8_t mode)
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static inline _nib_offl_entry_t *_nib_offl_add(const ipv6_addr_t *next_hop,
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unsigned iface,
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const ipv6_addr_t *pfx,
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unsigned pfx_len, uint8_t mode)
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{
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_nib_offl_entry_t *nib_offl = _nib_dst_alloc(next_hop, iface, pfx, pfx_len);
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_nib_offl_entry_t *nib_offl = _nib_offl_alloc(next_hop, iface, pfx, pfx_len);
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if (nib_offl != NULL) {
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nib_offl->next_hop->mode |= (mode);
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nib_offl->mode |= mode;
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}
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return nib_offl;
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}
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@ -483,17 +485,13 @@ static inline _nib_offl_entry_t *_nib_dst_add(const ipv6_addr_t *next_hop,
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*
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* @param[in,out] nib_offl An entry.
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*/
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static inline void _nib_dst_remove(_nib_offl_entry_t *nib_offl, uint8_t mode)
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static inline void _nib_offl_remove(_nib_offl_entry_t *nib_offl, uint8_t mode)
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{
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_nib_onl_entry_t *node = nib_offl->next_hop;
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if (node != NULL) {
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node->mode &= ~mode;
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}
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_nib_dst_clear(nib_offl);
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nib_offl->mode &= ~mode;
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_nib_offl_clear(nib_offl);
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}
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#if defined(GNRC_IPV6_NIB_CONF_DC) || DOXYGEN
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#if GNRC_IPV6_NIB_CONF_DC || DOXYGEN
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/**
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* @brief Creates or gets an existing destination cache entry by its addresses
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*
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@ -506,16 +504,16 @@ static inline void _nib_dst_remove(_nib_offl_entry_t *nib_offl, uint8_t mode)
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*
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* @note Only available if @ref GNRC_IPV6_NIB_CONF_DC.
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*
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* @return A new or existing destination cache entry with
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* _nib_onl_entry_t::ipv6 of _nib_dr_entry_t::next_hop set to
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* @p next_hop.
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* @return A new or existing off-link entry with _nib_offl_entry_t::pfx set to
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* @p pfx.
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* @return NULL, if no space is left.
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*/
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static inline _nib_offl_entry_t *_nib_dc_add(const ipv6_addr_t *next_hop,
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unsigned iface,
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const ipv6_addr_t *dst)
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{
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return _nib_dst_add(next_hop, iface, dst, IPV6_ADDR_BIT_LEN, _DC);
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assert((next_hop != NULL) && (dst != NULL));
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return _nib_offl_add(next_hop, iface, dst, IPV6_ADDR_BIT_LEN, _DC);
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}
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||||
|
||||
/**
|
||||
@ -529,7 +527,7 @@ static inline _nib_offl_entry_t *_nib_dc_add(const ipv6_addr_t *next_hop,
|
||||
*/
|
||||
static inline void _nib_dc_remove(_nib_offl_entry_t *nib_offl)
|
||||
{
|
||||
_nib_dst_remove(nib_offl, _DC);
|
||||
_nib_offl_remove(nib_offl, _DC);
|
||||
}
|
||||
#endif /* GNRC_IPV6_NIB_CONF_DC */
|
||||
|
||||
@ -545,7 +543,7 @@ static inline void _nib_dc_remove(_nib_offl_entry_t *nib_offl)
|
||||
* @ref _nib_drl_add() for default route destinations.
|
||||
* @param[in] pfx_len The length in bits of @p pfx in bits.
|
||||
*
|
||||
* @return A new or existing prefix list entry with _nib_dr_entry_t::pfx set to
|
||||
* @return A new or existing off-link entry with _nib_offl_entry_t::pfx set to
|
||||
* @p pfx.
|
||||
* @return NULL, if no space is left.
|
||||
*/
|
||||
@ -553,7 +551,7 @@ static inline _nib_offl_entry_t *_nib_pl_add(unsigned iface,
|
||||
const ipv6_addr_t *pfx,
|
||||
unsigned pfx_len)
|
||||
{
|
||||
return _nib_dst_add(NULL, iface, pfx, pfx_len, _PL);
|
||||
return _nib_offl_add(NULL, iface, pfx, pfx_len, _PL);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -565,10 +563,10 @@ static inline _nib_offl_entry_t *_nib_pl_add(unsigned iface,
|
||||
*/
|
||||
static inline void _nib_pl_remove(_nib_offl_entry_t *nib_offl)
|
||||
{
|
||||
_nib_dst_remove(nib_offl, _PL);
|
||||
_nib_offl_remove(nib_offl, _PL);
|
||||
}
|
||||
|
||||
#if defined(GNRC_IPV6_NIB_CONF_ROUTER) || DOXYGEN
|
||||
#if GNRC_IPV6_NIB_CONF_ROUTER || DOXYGEN
|
||||
/**
|
||||
* @brief Creates or gets an existing forwarding table entry by its prefix
|
||||
*
|
||||
@ -585,8 +583,8 @@ static inline void _nib_pl_remove(_nib_offl_entry_t *nib_offl)
|
||||
*
|
||||
* @note Only available if @ref GNRC_IPV6_NIB_CONF_ROUTER.
|
||||
*
|
||||
* @return A new or existing forwarding table entry with _nib_dr_entry_t::pfx
|
||||
* set to @p pfx.
|
||||
* @return A new or existing off-link entry with _nib_offl_entry_t::pfx set to
|
||||
* @p pfx.
|
||||
* @return NULL, if no space is left.
|
||||
*/
|
||||
static inline _nib_offl_entry_t *_nib_ft_add(const ipv6_addr_t *next_hop,
|
||||
@ -594,7 +592,7 @@ static inline _nib_offl_entry_t *_nib_ft_add(const ipv6_addr_t *next_hop,
|
||||
const ipv6_addr_t *pfx,
|
||||
unsigned pfx_len)
|
||||
{
|
||||
return _nib_dst_add(next_hop, iface, pfx, pfx_len, _FT);
|
||||
return _nib_offl_add(next_hop, iface, pfx, pfx_len, _FT);
|
||||
}
|
||||
|
||||
/**
|
||||
@ -608,7 +606,7 @@ static inline _nib_offl_entry_t *_nib_ft_add(const ipv6_addr_t *next_hop,
|
||||
*/
|
||||
static inline void _nib_ft_remove(_nib_offl_entry_t *nib_offl)
|
||||
{
|
||||
_nib_dst_remove(nib_offl, _FT);
|
||||
_nib_offl_remove(nib_offl, _FT);
|
||||
}
|
||||
#endif /* GNRC_IPV6_NIB_CONF_ROUTER */
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user