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nib: implement public NIB functions up to link-local AR
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| /* | ||
| * Copyright (C) 2017 Freie Universität Berlin | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| /** | ||
| * @{ | ||
| * | ||
| * @file | ||
| * @author Martine Lenders <m.lenders@fu-berlin.de> | ||
| */ | ||
|
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| #include "net/gnrc/ipv6/nib.h" | ||
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| #include "_nib-6ln.h" | ||
| #include "_nib-6lr.h" | ||
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| #define ENABLE_DEBUG (0) | ||
| #include "debug.h" | ||
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| #if GNRC_IPV6_NIB_CONF_6LN | ||
| #if ENABLE_DEBUG | ||
| static char addr_str[IPV6_ADDR_MAX_STR_LEN]; | ||
| #endif | ||
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| static bool _is_iface_eui64(kernel_pid_t iface, const eui64_t *eui64) | ||
| { | ||
| eui64_t iface_eui64; | ||
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| /* XXX: this *should* return successful so don't test it ;-) */ | ||
| gnrc_netapi_get(iface, NETOPT_ADDRESS_LONG, 0, | ||
| &iface_eui64, sizeof(iface_eui64)); | ||
| return (memcmp(&iface_eui64, eui64, sizeof(iface_eui64)) != 0); | ||
| } | ||
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| bool _resolve_addr_from_ipv6(const ipv6_addr_t *dst, kernel_pid_t iface, | ||
| gnrc_ipv6_nib_nc_t *nce) | ||
| { | ||
| gnrc_ipv6_netif_t *netif = gnrc_ipv6_netif_get(iface); | ||
| bool res = (netif != NULL) && _is_6ln(netif) && | ||
| ipv6_addr_is_link_local(dst); | ||
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| if (res) { | ||
| memcpy(&nce->ipv6, dst, sizeof(nce->ipv6)); | ||
| memcpy(&nce->l2addr, &dst->u64[1], sizeof(dst->u64[1])); | ||
| nce->l2addr[0] ^= 0x02; | ||
| nce->info = 0; | ||
| nce->info |= (iface << GNRC_IPV6_NIB_NC_INFO_IFACE_POS) & | ||
| GNRC_IPV6_NIB_NC_INFO_IFACE_MASK; | ||
| nce->info |= GNRC_IPV6_NIB_NC_INFO_NUD_STATE_REACHABLE; | ||
| nce->info |= GNRC_IPV6_NIB_NC_INFO_AR_STATE_REGISTERED; | ||
| nce->l2addr_len = sizeof(dst->u64[1]); | ||
| } | ||
| return res; | ||
| } | ||
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| uint8_t _handle_aro(kernel_pid_t iface, const ipv6_hdr_t *ipv6, | ||
| const icmpv6_hdr_t *icmpv6, | ||
| const sixlowpan_nd_opt_ar_t *aro, const ndp_opt_t *sl2ao, | ||
| _nib_onl_entry_t *nce) | ||
| { | ||
| gnrc_ipv6_netif_t *netif = gnrc_ipv6_netif_get(iface); | ||
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| #if !GNRC_IPV6_NIB_CONF_6LR | ||
| (void)sl2ao; | ||
| #endif | ||
| assert(netif != NULL); | ||
| if (_is_6ln(netif) && (aro->len == SIXLOWPAN_ND_OPT_AR_LEN)) { | ||
| DEBUG("nib: valid ARO received\n"); | ||
| DEBUG(" - length: %u\n", aro->len); | ||
| DEBUG(" - status: %u\n", aro->status); | ||
| DEBUG(" - registration lifetime: %u\n", byteorder_ntohs(aro->ltime)); | ||
| DEBUG(" - EUI-64: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", | ||
| aro->eui64.uint8[0], aro->eui64.uint8[1], aro->eui64.uint8[2], | ||
| aro->eui64.uint8[3], aro->eui64.uint8[4], aro->eui64.uint8[5], | ||
| aro->eui64.uint8[6], aro->eui64.uint8[7]); | ||
| if (icmpv6->type == ICMPV6_NBR_ADV) { | ||
| if (!_is_iface_eui64(iface, &aro->eui64)) { | ||
| DEBUG("nib: ARO EUI-64 is not mine, ignoring ARO\n"); | ||
| return _ADDR_REG_STATUS_IGNORE; | ||
| } | ||
| switch (aro->status) { | ||
| case SIXLOWPAN_ND_STATUS_SUCCESS: { | ||
| uint16_t ltime = byteorder_ntohs(aro->ltime); | ||
| uint32_t next_ns; | ||
| /* if ltime 1min, reschedule NS in 30sec, otherwise 1min | ||
| * before timeout */ | ||
| next_ns = (ltime == 1U) ? (30 * MS_PER_SEC) : | ||
| (byteorder_ntohs(aro->ltime) - 1U) * | ||
| SEC_PER_MIN * MS_PER_SEC; | ||
| DEBUG("nib: Address registration successful. " | ||
| "Scheduling re-registration in %ums\n", | ||
| next_ns); | ||
| assert(nce != NULL); | ||
| _evtimer_add(nce, GNRC_IPV6_NIB_SND_UC_NS, &nce->nud_timeout, | ||
| next_ns); | ||
| break; | ||
| } | ||
| case SIXLOWPAN_ND_STATUS_DUP: | ||
| DEBUG("nib: Address registration reports duplicate. " | ||
| "Removing address %s%%%u\n", | ||
| ipv6_addr_to_str(addr_str, | ||
| &((ndp_nbr_adv_t *)icmpv6)->tgt, | ||
| sizeof(addr_str)), | ||
| iface); | ||
| gnrc_ipv6_netif_remove_addr(iface, | ||
| &((ndp_nbr_adv_t *)icmpv6)->tgt); | ||
| /* TODO: generate new address */ | ||
| break; | ||
| case SIXLOWPAN_ND_STATUS_NC_FULL: { | ||
| DEBUG("nib: Router's neighbor cache is full. " | ||
| "Searching new router for DAD\n"); | ||
| _nib_dr_entry_t *dr = _nib_drl_get(&ipv6->src, iface); | ||
| assert(dr != NULL); /* otherwise we wouldn't be here */ | ||
| _nib_drl_remove(dr); | ||
| if (_nib_drl_iter(NULL) == NULL) { /* no DRL left */ | ||
| _nib_iface_t *nib_iface = _nib_iface_get(iface); | ||
| nib_iface->rs_sent = 0; | ||
| /* TODO: search new router */ | ||
| } | ||
| else { | ||
| assert(dr->next_hop != NULL); | ||
| _snd_uc_ns(dr->next_hop, true); | ||
| } | ||
| } | ||
| break; | ||
| } | ||
| return aro->status; | ||
| } | ||
| #if GNRC_IPV6_NIB_CONF_6LR | ||
| else if (_is_6lr(netif) && (icmpv6->type == ICMPV6_NBR_SOL)) { | ||
| return _reg_addr_upstream(iface, ipv6, icmpv6, aro, sl2ao); | ||
| } | ||
| #endif | ||
| } | ||
| #if ENABLE_DEBUG | ||
| else if (aro->len != SIXLOWPAN_ND_OPT_AR_LEN) { | ||
| DEBUG("nib: ARO of unexpected length %u, ignoring ARO\n", aro->len); | ||
| } | ||
| #endif | ||
| return _ADDR_REG_STATUS_IGNORE; | ||
| } | ||
| #else /* GNRC_IPV6_NIB_CONF_6LN */ | ||
| typedef int dont_be_pedantic; | ||
| #endif /* GNRC_IPV6_NIB_CONF_6LN */ | ||
|
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| /** @} */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /* | ||
| * Copyright (C) 2017 Freie Universität Berlin | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
||
| /** | ||
| * @ingroup net_gnrc_ipv6_nib | ||
| * @{ | ||
| * | ||
| * @file | ||
| * @brief Definitions related to 6Lo node (6LN) functionality of the NIB | ||
| * @see @ref GNRC_IPV6_NIB_CONF_6LN | ||
| * | ||
| * @author Martine Lenders <m.lenders@fu-berlin.de> | ||
| */ | ||
| #ifndef PRIV_NIB_6LN_H | ||
| #define PRIV_NIB_6LN_H | ||
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| #include <stdint.h> | ||
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| #include "net/gnrc/ipv6/nib/conf.h" | ||
| #include "net/sixlowpan/nd.h" | ||
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| #include "_nib-arsm.h" | ||
| #include "_nib-internal.h" | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
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| #if GNRC_IPV6_NIB_CONF_6LN || defined(DOXYGEN) | ||
| /** | ||
| * @brief Additional (local) status to ARO status values for tentative | ||
| * addresses | ||
| */ | ||
| #define _ADDR_REG_STATUS_TENTATIVE (3) | ||
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| /** | ||
| * @brief Additional (local) status to ARO status values for return values | ||
| * to signify that the address was ignored | ||
| */ | ||
| #define _ADDR_REG_STATUS_IGNORE (4) | ||
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| /** | ||
| * @brief Checks if interface represents a 6LN | ||
| * | ||
| * @todo Use corresponding function in `gnrc_netif2` instead. | ||
| * | ||
| * @param[in] netif A network interface. | ||
| * | ||
| * @return true, when the @p netif represents a 6LN. | ||
| * @return false, when the @p netif does not represent a 6LN. | ||
| */ | ||
| static inline bool _is_6ln(const gnrc_ipv6_netif_t *netif) | ||
| { | ||
| return (netif->flags & GNRC_IPV6_NETIF_FLAGS_SIXLOWPAN); | ||
| } | ||
|
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| /** | ||
| * @brief Resolves address statically from destination address using reverse | ||
| * translation of the IID | ||
| * | ||
| * @param[in] dst A destination address. | ||
| * @param[in] iface The interface to @p dst. | ||
| * @param[out] nce Neighbor cache entry to resolve into | ||
| * | ||
| * @return true when @p nce was set, false when not. | ||
| */ | ||
| bool _resolve_addr_from_ipv6(const ipv6_addr_t *dst, kernel_pid_t iface, | ||
| gnrc_ipv6_nib_nc_t *nce); | ||
|
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| /** | ||
| * @brief Handles ARO | ||
| * | ||
| * @param[in] iface The interface the ARO-carrying message came over. | ||
| * @param[in] ipv6 The IPv6 header of the message carrying the ARO. | ||
| * @param[in] icmpv6 The message carrying the ARO. | ||
| * @param[in] aro ARO that carries the address registration information. | ||
| * @param[in] sl2ao SL2AO associated with the ARO. | ||
| * @param[in] nce Neighbor cache entry the ARO is supposed to change. | ||
| * | ||
| * @return registration status of the address (including | ||
| * @ref _ADDR_REG_STATUS_TENTATIVE and @ref _ADDR_REG_STATUS_IGNORE). | ||
| */ | ||
| uint8_t _handle_aro(kernel_pid_t iface, const ipv6_hdr_t *ipv6, | ||
| const icmpv6_hdr_t *icmpv6, | ||
| const sixlowpan_nd_opt_ar_t *aro, const ndp_opt_t *sl2ao, | ||
| _nib_onl_entry_t *nce); | ||
| #else /* GNRC_IPV6_NIB_CONF_6LN || defined(DOXYGEN) */ | ||
| #define _is_6ln(netif) (false) | ||
| #define _resolve_addr_from_ipv6(dst, iface, nce) (false) | ||
| /* _handle_aro() doesn't make sense without 6LR so don't even use it | ||
| * => throw error in case it is compiled in => don't define it here as NOP macro | ||
| */ | ||
| #endif /* GNRC_IPV6_NIB_CONF_6LN || defined(DOXYGEN) */ | ||
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
|
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| #endif /* PRIV_NIB_6LN_H */ | ||
| /** @} */ |
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