void ng_ndp_retrans_nbr_sol(ng_ipv6_nc_t *nc_entry) { if ((ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_INCOMPLETE) || (ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_PROBE)) { if (nc_entry->probes_remaining > 1) { ng_ipv6_addr_t dst; DEBUG("ndp: Retransmit neighbor solicitation for %s\n", ng_ipv6_addr_to_str(addr_str, &nc_entry->ipv6_addr, sizeof(addr_str))); /* retransmit neighbor solicatation */ if (ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_INCOMPLETE) { ng_ipv6_addr_set_solicited_nodes(&dst, &nc_entry->ipv6_addr); } else { dst.u64[0] = nc_entry->ipv6_addr.u64[0]; dst.u64[1] = nc_entry->ipv6_addr.u64[1]; } nc_entry->probes_remaining--; if (nc_entry->iface == KERNEL_PID_UNDEF) { timex_t t = { 0, NG_NDP_RETRANS_TIMER }; kernel_pid_t ifs[NG_NETIF_NUMOF]; size_t ifnum = ng_netif_get(ifs); for (size_t i = 0; i < ifnum; i++) { _send_nbr_sol(ifs[i], &nc_entry->ipv6_addr, &dst); } vtimer_remove(&nc_entry->nbr_sol_timer); vtimer_set_msg(&nc_entry->nbr_sol_timer, t, ng_ipv6_pid, NG_NDP_MSG_NBR_SOL_RETRANS, nc_entry); } else { ng_ipv6_netif_t *ipv6_iface = ng_ipv6_netif_get(nc_entry->iface); _send_nbr_sol(nc_entry->iface, &nc_entry->ipv6_addr, &dst); mutex_lock(&ipv6_iface->mutex); vtimer_remove(&nc_entry->nbr_sol_timer); vtimer_set_msg(&nc_entry->nbr_sol_timer, ipv6_iface->retrans_timer, ng_ipv6_pid, NG_NDP_MSG_NBR_SOL_RETRANS, nc_entry); mutex_unlock(&ipv6_iface->mutex); } } else if (nc_entry->probes_remaining <= 1) { DEBUG("ndp: Remove nc entry %s for interface %" PRIkernel_pid "\n", ng_ipv6_addr_to_str(addr_str, &nc_entry->ipv6_addr, sizeof(addr_str)), nc_entry->iface); #ifdef MODULE_FIB fib_remove_entry((uint8_t *) & (nc_entry->ipv6_addr), sizeof(ng_ipv6_addr_t)); #endif ng_ipv6_nc_remove(nc_entry->iface, &nc_entry->ipv6_addr); } } }
static ng_ipv6_addr_t *_add_addr_to_entry(ng_ipv6_netif_t *entry, const ng_ipv6_addr_t *addr, uint8_t prefix_len, uint8_t flags) { ng_ipv6_netif_addr_t *tmp_addr = NULL; for (int i = 0; i < NG_IPV6_NETIF_ADDR_NUMOF; i++) { if (ng_ipv6_addr_equal(&(entry->addrs[i].addr), addr)) { return &(entry->addrs[i].addr); } if (ng_ipv6_addr_is_unspecified(&(entry->addrs[i].addr)) && !tmp_addr) { tmp_addr = &(entry->addrs[i]); } } if (!tmp_addr) { DEBUG("ipv6 netif: couldn't add %s/%" PRIu8 " to interface %" PRIkernel_pid "\n: No space left.", ng_ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)), prefix_len, entry->pid); return NULL; } memcpy(&(tmp_addr->addr), addr, sizeof(ng_ipv6_addr_t)); DEBUG("ipv6 netif: Added %s/%" PRIu8 " to interface %" PRIkernel_pid "\n", ng_ipv6_addr_to_str(addr_str, addr, sizeof(addr_str)), prefix_len, entry->pid); tmp_addr->prefix_len = prefix_len; tmp_addr->flags = flags; if (ng_ipv6_addr_is_multicast(addr)) { tmp_addr->flags |= NG_IPV6_NETIF_ADDR_FLAGS_NON_UNICAST; } else { ng_ipv6_addr_t sol_node; if (!ng_ipv6_addr_is_link_local(addr)) { /* add also corresponding link-local address */ ng_ipv6_addr_t ll_addr; ll_addr.u64[1] = addr->u64[1]; ng_ipv6_addr_set_link_local_prefix(&ll_addr); _add_addr_to_entry(entry, &ll_addr, 64, flags | NG_IPV6_NETIF_ADDR_FLAGS_NDP_ON_LINK); } else { tmp_addr->flags |= NG_IPV6_NETIF_ADDR_FLAGS_NDP_ON_LINK; } ng_ipv6_addr_set_solicited_nodes(&sol_node, addr); _add_addr_to_entry(entry, &sol_node, NG_IPV6_ADDR_BIT_LEN, 0); } return &(tmp_addr->addr); }
static void test_ipv6_addr_set_solicited_nodes(void) { ng_ipv6_addr_t a = NG_IPV6_ADDR_UNSPECIFIED; ng_ipv6_addr_t b = { { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f } }; ng_ipv6_addr_set_solicited_nodes(&a, &b); TEST_ASSERT_EQUAL_INT(0xff020000, byteorder_ntohl(a.u32[0])); TEST_ASSERT_EQUAL_INT(0, a.u32[1].u32); TEST_ASSERT_EQUAL_INT(1, byteorder_ntohl(a.u32[2])); TEST_ASSERT_EQUAL_INT(0xff0d0e0f, byteorder_ntohl(a.u32[3])); }
kernel_pid_t ng_ndp_next_hop_l2addr(uint8_t *l2addr, uint8_t *l2addr_len, kernel_pid_t iface, ng_ipv6_addr_t *dst, ng_pktsnip_t *pkt) { ng_ipv6_addr_t *next_hop_ip = NULL, *prefix = NULL; #ifdef MODULE_NG_IPV6_EXT_RH next_hop_ip = ng_ipv6_ext_rh_next_hop(hdr); #endif #ifdef MODULE_FIB size_t next_hop_size = sizeof(ng_ipv6_addr_t); uint32_t next_hop_flags = 0; ng_ipv6_addr_t next_hop_actual; /* FIB copies address into this variable */ if ((next_hop_ip == NULL) && (fib_get_next_hop(&iface, next_hop_actual.u8, &next_hop_size, &next_hop_flags, (uint8_t *)dst, sizeof(ng_ipv6_addr_t), 0) >= 0) && (next_hop_size == sizeof(ng_ipv6_addr_t))) { next_hop_ip = &next_hop_actual; } #endif if (next_hop_ip == NULL) { /* no route to host */ if (iface == KERNEL_PID_UNDEF) { /* ng_ipv6_netif_t doubles as prefix list */ iface = ng_ipv6_netif_find_by_prefix(&prefix, dst); } else { /* ng_ipv6_netif_t doubles as prefix list */ prefix = ng_ipv6_netif_match_prefix(iface, dst); } if ((prefix != NULL) && /* prefix is on-link */ (ng_ipv6_netif_addr_get(prefix)->flags & NG_IPV6_NETIF_ADDR_FLAGS_NDP_ON_LINK)) { next_hop_ip = dst; #ifdef MODULE_FIB /* We don't care if FIB is full, this is just for efficiency * for later sends */ fib_add_entry(iface, (uint8_t *)dst, sizeof(ng_ipv6_addr_t), 0, (uint8_t *)next_hop_ip, sizeof(ng_ipv6_addr_t), 0, FIB_LIFETIME_NO_EXPIRE); #endif } } if (next_hop_ip == NULL) { next_hop_ip = _default_router(); #ifdef MODULE_FIB /* We don't care if FIB is full, this is just for efficiency for later * sends */ fib_add_entry(iface, (uint8_t *)dst, sizeof(ng_ipv6_addr_t), 0, (uint8_t *)next_hop_ip, sizeof(ng_ipv6_addr_t), 0, FIB_LIFETIME_NO_EXPIRE); #endif } if (next_hop_ip != NULL) { ng_ipv6_nc_t *nc_entry = ng_ipv6_nc_get(iface, next_hop_ip); if ((nc_entry != NULL) && ng_ipv6_nc_is_reachable(nc_entry)) { DEBUG("ndp: found reachable neighbor (%s => ", ng_ipv6_addr_to_str(addr_str, &nc_entry->ipv6_addr, sizeof(addr_str))); DEBUG("%s)\n", ng_netif_addr_to_str(addr_str, sizeof(addr_str), nc_entry->l2_addr, nc_entry->l2_addr_len)); if (ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_STALE) { _set_state(nc_entry, NG_IPV6_NC_STATE_DELAY); } memcpy(l2addr, nc_entry->l2_addr, nc_entry->l2_addr_len); *l2addr_len = nc_entry->l2_addr_len; /* TODO: unreachability check */ return nc_entry->iface; } else if (nc_entry == NULL) { ng_pktqueue_t *pkt_node; ng_ipv6_addr_t dst_sol; nc_entry = ng_ipv6_nc_add(iface, next_hop_ip, NULL, 0, NG_IPV6_NC_STATE_INCOMPLETE << NG_IPV6_NC_STATE_POS); if (nc_entry == NULL) { DEBUG("ndp: could not create neighbor cache entry\n"); return KERNEL_PID_UNDEF; } pkt_node = _alloc_pkt_node(pkt); if (pkt_node == NULL) { DEBUG("ndp: could not add packet to packet queue\n"); } else { /* prevent packet from being released by IPv6 */ ng_pktbuf_hold(pkt_node->pkt, 1); ng_pktqueue_add(&nc_entry->pkts, pkt_node); } /* address resolution */ ng_ipv6_addr_set_solicited_nodes(&dst_sol, next_hop_ip); if (iface == KERNEL_PID_UNDEF) { timex_t t = { 0, NG_NDP_RETRANS_TIMER }; kernel_pid_t ifs[NG_NETIF_NUMOF]; size_t ifnum = ng_netif_get(ifs); for (size_t i = 0; i < ifnum; i++) { _send_nbr_sol(ifs[i], next_hop_ip, &dst_sol); } vtimer_remove(&nc_entry->nbr_sol_timer); vtimer_set_msg(&nc_entry->nbr_sol_timer, t, ng_ipv6_pid, NG_NDP_MSG_NBR_SOL_RETRANS, nc_entry); } else { ng_ipv6_netif_t *ipv6_iface = ng_ipv6_netif_get(iface); _send_nbr_sol(iface, next_hop_ip, &dst_sol); mutex_lock(&ipv6_iface->mutex); vtimer_remove(&nc_entry->nbr_sol_timer); vtimer_set_msg(&nc_entry->nbr_sol_timer, ipv6_iface->retrans_timer, ng_ipv6_pid, NG_NDP_MSG_NBR_SOL_RETRANS, nc_entry); mutex_unlock(&ipv6_iface->mutex); } } } return KERNEL_PID_UNDEF; }
void ng_ndp_retrans_nbr_sol(ng_ipv6_nc_t *nc_entry) { if ((nc_entry->probes_remaining > 1) && ((ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_INCOMPLETE) || (ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_PROBE))) { ng_ipv6_addr_t dst; DEBUG("ndp: Retransmit neighbor solicitation for %s\n", ng_ipv6_addr_to_str(addr_str, &nc_entry->ipv6_addr, sizeof(addr_str))); /* retransmit neighbor solicatation */ if (ng_ipv6_nc_get_state(nc_entry) == NG_IPV6_NC_STATE_INCOMPLETE) { ng_ipv6_addr_set_solicited_nodes(&dst, &nc_entry->ipv6_addr); } else { dst.u64[0] = nc_entry->ipv6_addr.u64[0]; dst.u64[1] = nc_entry->ipv6_addr.u64[1]; } nc_entry->probes_remaining--; if (nc_entry->iface == KERNEL_PID_UNDEF) { timex_t t = { 0, NG_NDP_RETRANS_TIMER }; kernel_pid_t ifs[NG_NETIF_NUMOF]; size_t ifnum = ng_netif_get(ifs); for (size_t i = 0; i < ifnum; i++) { _send_nbr_sol(ifs[i], &nc_entry->ipv6_addr, &dst); } vtimer_remove(&nc_entry->nbr_sol_timer); vtimer_set_msg(&nc_entry->nbr_sol_timer, t, ng_ipv6_pid, NG_NDP_MSG_NBR_SOL_RETRANS, nc_entry); } else { ng_ipv6_netif_t *ipv6_iface = ng_ipv6_netif_get(nc_entry->iface); _send_nbr_sol(nc_entry->iface, &nc_entry->ipv6_addr, &dst); mutex_lock(&ipv6_iface->mutex); vtimer_remove(&nc_entry->nbr_sol_timer); vtimer_set_msg(&nc_entry->nbr_sol_timer, ipv6_iface->retrans_timer, ng_ipv6_pid, NG_NDP_MSG_NBR_SOL_RETRANS, nc_entry); mutex_unlock(&ipv6_iface->mutex); } } else if (nc_entry->probes_remaining <= 1) { ng_pktqueue_node_t *queue_node; /* No need to call ng_ipv6_nc_remove() we know already were the * entry is */ DEBUG("ndp: Remove nc entry %s for interface %" PRIkernel_pid "\n", ng_ipv6_addr_to_str(addr_str, &nc_entry->ipv6_addr, sizeof(addr_str)), nc_entry->iface); while ((queue_node = ng_pktqueue_remove_head(&nc_entry->pkts))) { ng_pktbuf_release(queue_node->data); queue_node->data = NULL; } ng_ipv6_addr_set_unspecified(&(nc_entry->ipv6_addr)); nc_entry->iface = KERNEL_PID_UNDEF; nc_entry->flags = 0; nc_entry->probes_remaining = 0; } }