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564 lines
20 KiB
C
564 lines
20 KiB
C
/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for
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* more details.
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*/
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/**
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* @defgroup net_gnrc_ndp IPv6 Neighbor discovery
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* @ingroup net_gnrc_icmpv6
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* @brief GNRC's IPv6 Neighbor Discovery implementation
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* @{
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*
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* @file
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* @brief Definitions for GNRC's IPv6 Neighbor Discovery
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*
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* @author Martine Lenders <mlenders@inf.fu-berlin.de>
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*/
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#ifndef GNRC_NDP_H
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#define GNRC_NDP_H
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#include <inttypes.h>
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#include <stdlib.h>
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#include "byteorder.h"
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#include "net/ndp.h"
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#include "net/gnrc/pkt.h"
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#include "net/gnrc/icmpv6.h"
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#include "net/ipv6/addr.h"
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#include "net/gnrc/ipv6/nc.h"
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#include "net/gnrc/ipv6/netif.h"
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#include "net/gnrc/ndp/host.h"
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#include "net/gnrc/ndp/internal.h"
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#include "net/gnrc/ndp/router.h"
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#include "net/gnrc/ndp/node.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** Message type for router timeouts */
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#define GNRC_NDP_MSG_RTR_TIMEOUT (0x0210)
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/** Message type for address timeouts */
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#define GNRC_NDP_MSG_ADDR_TIMEOUT (0x0211)
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/** Message type for multicast neighbor solicitation retransmissions */
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#define GNRC_NDP_MSG_NBR_SOL_RETRANS (0x0212)
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/** Message type for periodic router advertisements */
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#define GNRC_NDP_MSG_RTR_ADV_RETRANS (0x0213)
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/** Message type for delayed router advertisements */
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#define GNRC_NDP_MSG_RTR_ADV_DELAY (0x0214)
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/** Message type for delayed router advertisements in a 6LoWPAN
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* 6LoWPAN needs a special handling, because router advertisements are only
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* sent after a short randomized delay, but not periodically. */
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#define GNRC_NDP_MSG_RTR_ADV_SIXLOWPAN_DELAY (0x0215)
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/** Message type for periodic router solicitations */
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#define GNRC_NDP_MSG_RTR_SOL_RETRANS (0x0216)
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/** Message type for neighbor cache state timeouts */
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#define GNRC_NDP_MSG_NC_STATE_TIMEOUT (0x0217)
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/**
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* @name Host constants
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* @{
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-10">
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* RFC 4861, section 10
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* </a>
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*/
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/**
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* @brief Upper bound for randomised delay in seconds for initial
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* router solicitation transmissions
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*/
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#define GNRC_NDP_MAX_RTR_SOL_DELAY (1U)
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/**
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* @brief Interval in seconds between initial router solicitation
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* transmissions
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*/
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#define GNRC_NDP_MAX_RTR_SOL_INT (4U)
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/**
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* @brief Maximum number of initial router solicitation transmissions
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*/
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#define GNRC_NDP_MAX_RTR_SOL_NUMOF (3U)
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/** @} */
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/**
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* @name Node constants
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* @{
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-10">
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* RFC 4861, section 10
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* </a>
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*/
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/**
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* @brief Maximum number of unanswered multicast neighbor solicitations
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* before address resolution is considered failed.
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*/
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#define GNRC_NDP_MAX_MC_NBR_SOL_NUMOF (3U)
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/**
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* @brief Maximum number of unanswered unicast neighbor solicitations before
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* an address is considered unreachable.
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*/
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#define GNRC_NDP_MAX_UC_NBR_SOL_NUMOF (3U)
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/**
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* @brief Upper bound of randomized delay in seconds for a solicited
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* neighbor advertisement transmission for an anycast target.
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*/
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#define GNRC_NDP_MAX_AC_TGT_DELAY (1U)
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/**
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* @brief Maximum number of unsolicited neighbor advertisements before on
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* link-layer address change.
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*/
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#define GNRC_NDP_MAX_NBR_ADV_NUMOF (3U)
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/**
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* @brief Base value in mircoseconds for computing randomised
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* reachable time.
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*/
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#define GNRC_NDP_REACH_TIME (30U * US_PER_SEC)
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/**
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* @brief Time in mircoseconds between retransmissions of neighbor
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* solicitations to a neighbor.
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*/
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#define GNRC_NDP_RETRANS_TIMER (1U * US_PER_SEC)
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/**
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* @brief Delay in seconds for neighbor cache entry between entering
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* DELAY state and entering PROBE state if no reachability
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* confirmation has been received.
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*/
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#define GNRC_NDP_FIRST_PROBE_DELAY (5U)
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/**
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* @brief Lower bound for randomised reachable time calculation.
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*/
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#define GNRC_NDP_MIN_RAND (5U)
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/**
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* @brief Upper bound for randomised reachable time calculation.
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*/
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#define GNRC_NDP_MAX_RAND (15U)
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/** @} */
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/**
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* @name Router constants
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* @{
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-10">
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* RFC 4861, section 10
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* </a>
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*/
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/**
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* @brief Initial router advertisement interval in seconds
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*/
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#define GNRC_NDP_MAX_INIT_RTR_ADV_INT (16U)
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/**
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* @brief Maximum number of initial router advertisement transmissions
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*/
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#define GNRC_NDP_MAX_INIT_RTR_ADV_NUMOF (3U)
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/**
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* @brief Maximum number of final router advertisement transmissions
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*/
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#define GNRC_NDP_MAX_FIN_RTR_ADV_NUMOF (3U)
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/**
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* @brief Minimum delay in seconds between router advertisement
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* transmissions
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*/
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#define GNRC_NDP_MIN_RTR_ADV_DELAY (3U)
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/**
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* @brief Upper bound for randomised delay in microseconds between router
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* solicitation reception and responding router advertisement
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* transmission.
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*/
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#define GNRC_NDP_MAX_RTR_ADV_DELAY (500U * US_PER_MS)
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/** @} */
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/**
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* @brief Handles received neighbor solicitations.
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*
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* @param[in] iface The receiving interface.
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* @param[in] pkt The received packet.
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* @param[in] ipv6 The IPv6 header in @p pkt.
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* @param[in] nbr_sol The neighbor solicitation in @p pkt.
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* @param[in] icmpv6_size The overall size of the neighbor solicitation.
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*/
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void gnrc_ndp_nbr_sol_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
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ipv6_hdr_t *ipv6, ndp_nbr_sol_t *nbr_sol,
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size_t icmpv6_size);
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/**
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* @brief Handles received neighbor advertisements.
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*
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* @param[in] iface The receiving interface.
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* @param[in] pkt The received packet.
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* @param[in] ipv6 The IPv6 header in @p pkt.
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* @param[in] nbr_adv The neighbor advertisement in @p pkt.
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* @param[in] icmpv6_size The overall size of the neighbor advertisement.
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*/
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void gnrc_ndp_nbr_adv_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
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ipv6_hdr_t *ipv6, ndp_nbr_adv_t *nbr_adv,
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size_t icmpv6_size);
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#if (defined(MODULE_GNRC_NDP_ROUTER) || defined(MODULE_GNRC_SIXLOWPAN_ND_ROUTER))
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/**
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* @brief Handles received router solicitations.
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*
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* @param[in] iface The receiving interface.
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* @param[in] pkt The received packet.
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* @param[in] ipv6 The IPv6 header in @p pkt.
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* @param[in] rtr_sol The router solicitation in @p pkt.
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* @param[in] icmpv6_size The overall size of the router solicitation.
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*/
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void gnrc_ndp_rtr_sol_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
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ipv6_hdr_t *ipv6, ndp_rtr_sol_t *rtr_sol,
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size_t icmpv6_size);
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#else
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/**
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* @brief A host *must* silently discard all received router solicitations.
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.2.6">
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* RFC 4861, section 6.2.6
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* </a>
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*
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* This macro is primarily an optimization to not go into the function defined
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* above.
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*/
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#define gnrc_ndp_rtr_sol_handle(iface, pkt, ipv6, rtr_sol, size)
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#endif
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/**
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* @brief Handles received router advertisements
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*
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* @todo As router check consistency as described in RFC 4861, section 6.2.3
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*
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* @param[in] iface The receiving interface.
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* @param[in] pkt The received packet.
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* @param[in] ipv6 The IPv6 header in @p pkt.
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* @param[in] rtr_adv The router advertisement in @p pkt.
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* @param[in] icmpv6_size The overall size of the router advertisement.
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*/
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void gnrc_ndp_rtr_adv_handle(kernel_pid_t iface, gnrc_pktsnip_t *pkt,
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ipv6_hdr_t *ipv6, ndp_rtr_adv_t *rtr_adv,
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size_t icmpv6_size);
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/**
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* @brief Retransmits a multicast neighbor solicitation for an incomplete or
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* probing neighbor cache entry @p nc_entry,
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* if nc_entry::probes_remaining > 0.
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*
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* @details If nc_entry::probes_remaining > 0 it will be decremented. If it
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* reaches 0 it the entry @p nc_entry will be removed from the
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* neighbor cache.
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*
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* @param[in] nc_entry A neighbor cache entry. Will be ignored if its state
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* is not @ref GNRC_IPV6_NC_STATE_INCOMPLETE or
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* @ref GNRC_IPV6_NC_STATE_PROBE.
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*/
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void gnrc_ndp_retrans_nbr_sol(gnrc_ipv6_nc_t *nc_entry);
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/**
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* @brief Event handler for a neighbor cache state timeout.
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*
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* @param[in] nc_entry A neighbor cache entry.
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*/
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void gnrc_ndp_state_timeout(gnrc_ipv6_nc_t *nc_entry);
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/**
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* @brief NDP interface initialization.
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*
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* @param[in] iface An IPv6 interface descriptor. Must not be NULL.
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*/
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void gnrc_ndp_netif_add(gnrc_ipv6_netif_t *iface);
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/**
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* @brief NDP interface removal.
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*
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* @param[in] iface An IPv6 interface descriptor. Must not be NULL.
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*/
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void gnrc_ndp_netif_remove(gnrc_ipv6_netif_t *iface);
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/**
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* @brief Get link-layer address and interface for next hop to destination
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* IPv6 address.
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*
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* @param[out] l2addr The link-layer for the next hop to @p dst.
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* @param[out] l2addr_len Length of @p l2addr.
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* @param[in] iface The interface to search the next hop on.
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* May be @ref KERNEL_PID_UNDEF if not specified.
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* @param[in] dst An IPv6 address to search the next hop for.
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* @param[in] pkt Packet to send to @p dst. Leave NULL if you
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* just want to get the addresses.
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*
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* @return The PID of the interface, on success.
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* @return -EHOSTUNREACH, if @p dst is not reachable.
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* @return -ENOBUFS, if @p l2addr_len was smaller than the resulting @p l2addr
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* would be long.
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*/
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kernel_pid_t gnrc_ndp_next_hop_l2addr(uint8_t *l2addr, uint8_t *l2addr_len,
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kernel_pid_t iface, ipv6_addr_t *dst,
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gnrc_pktsnip_t *pkt);
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/**
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* @brief Builds a neighbor solicitation message for sending.
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*
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.3">
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* RFC 4861, section 4.3
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* </a>
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*
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* @param[in] tgt The target address.
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* @param[in] options Options to append to the router solicitation.
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*
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* @return The resulting ICMPv6 packet on success.
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* @return NULL, on failure.
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*/
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gnrc_pktsnip_t *gnrc_ndp_nbr_sol_build(ipv6_addr_t *tgt, gnrc_pktsnip_t *options);
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/**
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* @brief Builds a neighbor advertisement message for sending.
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*
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.4">
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* RFC 4861, section 4.4
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* </a>
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*
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* @param[in] flags Neighbor advertisement flags:
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* @ref NDP_NBR_ADV_FLAGS_R == 1 indicates, that the
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* sender is a router,
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* @ref NDP_NBR_ADV_FLAGS_S == 1 indicates that the
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* advertisement was sent in response to a neighbor
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* solicitation,
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* @ref NDP_NBR_ADV_FLAGS_O == 1 indicates that the
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* advertisement should override an existing cache entry
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* and update the cached link-layer address.
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* @param[in] tgt For solicited advertisements, the Target Address field
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* in the neighbor solicitaton.
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* For and unsolicited advertisement, the address whose
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* link-layer address has changed.
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* MUST NOT be multicast.
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* @param[in] options Options to append to the neighbor advertisement.
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*
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* @return The resulting ICMPv6 packet on success.
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* @return NULL, on failure.
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*/
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gnrc_pktsnip_t *gnrc_ndp_nbr_adv_build(uint8_t flags, ipv6_addr_t *tgt,
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gnrc_pktsnip_t *options);
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/**
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* @brief Builds a router solicitation message for sending.
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*
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.1">
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* RFC 4861, section 4.1
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* </a>
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*
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* @param[in] options Options to append to the router solicitation.
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*
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* @return The resulting ICMPv6 packet on success.
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* @return NULL, on failure.
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*/
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gnrc_pktsnip_t *gnrc_ndp_rtr_sol_build(gnrc_pktsnip_t *options);
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/**
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* @brief Builds a router solicitation message for sending.
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*
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.1">
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* RFC 4861, section 4.1
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* </a>
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*
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* @param[in] options Options to append to the router solicitation.
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*
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* @return The resulting ICMPv6 packet on success.
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* @return NULL, on failure.
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*/
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gnrc_pktsnip_t *gnrc_ndp_rtr_sol_build(gnrc_pktsnip_t *options);
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#if (defined(MODULE_GNRC_NDP_ROUTER) || defined(MODULE_GNRC_SIXLOWPAN_ND_ROUTER))
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/**
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* @brief Builds a router advertisement message for sending.
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*
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.2">
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* RFC 4861, section 4.2
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* </a>
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*
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* @note The source address for the packet MUST be the link-local address
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* of the interface.
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*
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* @param[in] cur_hl Default hop limit for outgoing IP packets, 0 if
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* unspecified by this router.
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* @param[in] flags Flags as defined above.
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* @ref NDP_RTR_ADV_FLAGS_M == 1 indicates, that the
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* addresses are managed by DHCPv6,
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* @ref NDP_RTR_ADV_FLAGS_O == 1 indicates that other
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* configuration information is available via DHCPv6.
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* @param[in] ltime Lifetime of the default router in seconds.
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* @param[in] reach_time Time in milliseconds a node should assume a neighbor
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* reachable. 0 means unspecified by the router.
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* @param[in] retrans_timer Time in milliseconds between retransmitted
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* neighbor solicitations. 0 means unspecified by
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* the router.
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* @param[in] options Options to append to the router advertisement.
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*
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* @return The resulting ICMPv6 packet on success.
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* @return NULL, on failure.
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*/
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gnrc_pktsnip_t *gnrc_ndp_rtr_adv_build(uint8_t cur_hl, uint8_t flags, uint16_t ltime,
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uint32_t reach_time, uint32_t retrans_timer,
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gnrc_pktsnip_t *options);
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#else
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/**
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* @brief A host *must not* send router advertisements at any time (so why build them?)
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.3.4">
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* RFC 4861, section 6.3.4
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* </a>
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*
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* This macro is primarily an optimization to not go into the function defined
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* above.
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*/
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#define gnrc_ndp_rtr_adv_build(cur_hl, flags, ltime, reach_time, retrans_timer, options) (NULL)
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#endif
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/**
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* @brief Builds a generic NDP option.
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*
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* @param[in] type Type of the option.
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* @param[in] size Size in byte of the option (will be rounded up to the next
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* multiple of 8).
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* @param[in] next More options in the packet. NULL, if there are none.
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*
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* @return The packet snip list of options, on success
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* @return NULL, if packet buffer is full
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*/
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gnrc_pktsnip_t *gnrc_ndp_opt_build(uint8_t type, size_t size, gnrc_pktsnip_t *next);
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/**
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* @brief Builds the source link-layer address option.
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*
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* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.6.1">
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* RFC 4861, section 4.6.1
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* </a>
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*
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* @note Must only be used with neighbor solicitations, router solicitations,
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* and router advertisements. This is not checked however, since
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* hosts should silently ignore it in other NDP messages.
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*
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* @param[in] l2addr A link-layer address of variable length.
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* @param[in] l2addr_len Length of @p l2addr.
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* @param[in] next More options in the packet. NULL, if there are none.
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*
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* @return The packet snip list of options, on success
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* @return NULL, if packet buffer is full
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*/
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|
gnrc_pktsnip_t *gnrc_ndp_opt_sl2a_build(const uint8_t *l2addr, uint8_t l2addr_len,
|
|
gnrc_pktsnip_t *next);
|
|
|
|
/**
|
|
* @brief Builds the target link-layer address option.
|
|
*
|
|
* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.6.1">
|
|
* RFC 4861, section 4.6.1
|
|
* </a>
|
|
*
|
|
* @note Must only be used with neighbor advertisemnents and redirect packets.
|
|
* This is not checked however, since hosts should silently ignore it
|
|
* in other NDP messages.
|
|
*
|
|
* @param[in] l2addr A link-layer address of variable length.
|
|
* @param[in] l2addr_len Length of @p l2addr.
|
|
* @param[in] next More options in the packet. NULL, if there are none.
|
|
*
|
|
* @return The pkt snip list of options, on success
|
|
* @return NULL, if packet buffer is full
|
|
*/
|
|
gnrc_pktsnip_t *gnrc_ndp_opt_tl2a_build(const uint8_t *l2addr, uint8_t l2addr_len,
|
|
gnrc_pktsnip_t *next);
|
|
|
|
#if (defined(MODULE_GNRC_NDP_ROUTER) || defined(MODULE_GNRC_SIXLOWPAN_ND_ROUTER))
|
|
/**
|
|
* @brief Builds the prefix information option.
|
|
*
|
|
* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.6.2">
|
|
* RFC 4861, section 4.6.2
|
|
* </a>
|
|
*
|
|
* @note Must only be used with router advertisemnents. This is not checked
|
|
* however, since nodes should silently ignore it in other NDP messages.
|
|
*
|
|
* @param[in] prefix_len The length of @p prefix in bits. Must be between
|
|
* 0 and 128.
|
|
* @param[in] flags Flags as defined above.
|
|
* @ref NDP_OPT_PI_FLAGS_L == 1 indicates, that
|
|
* @p prefix can be used for on-link determination,
|
|
* @ref NDP_OPT_PI_FLAGS_A == 1 indicates, that
|
|
* @p prefix can be used for stateless address
|
|
* configuration.
|
|
* @param[in] valid_ltime Length of time in seconds that @p prefix is valid.
|
|
* UINT32_MAX represents infinity.
|
|
* @param[in] pref_ltime Length of time in seconds that addresses using
|
|
* @p prefix remain prefered. UINT32_MAX represents
|
|
* infinity.
|
|
* @param[in] prefix An IPv6 address or a prefix of an IPv6 address.
|
|
* @param[in] next More options in the packet. NULL, if there are none.
|
|
*
|
|
* @return The packet snip list of options, on success
|
|
* @return NULL, if packet buffer is full
|
|
*/
|
|
gnrc_pktsnip_t *gnrc_ndp_opt_pi_build(uint8_t prefix_len, uint8_t flags,
|
|
uint32_t valid_ltime, uint32_t pref_ltime,
|
|
ipv6_addr_t *prefix, gnrc_pktsnip_t *next);
|
|
|
|
/**
|
|
* @brief Builds the MTU option.
|
|
*
|
|
* @see <a href="https://tools.ietf.org/html/rfc4861#section-4.6.4">
|
|
* RFC 4861, section 4.6.4
|
|
* </a>
|
|
*
|
|
* @note Must only be used with router advertisemnents. This is not checked
|
|
* however, since nodes should silently ignore it in other NDP messages.
|
|
*
|
|
* @param[in] mtu The recommended MTU for the link.
|
|
* @param[in] next More options in the packet. NULL, if there are none.
|
|
*
|
|
* @return The packet snip list of options, on success
|
|
* @return NULL, if packet buffer is full
|
|
*/
|
|
gnrc_pktsnip_t *gnrc_ndp_opt_mtu_build(uint32_t mtu, gnrc_pktsnip_t *next);
|
|
#else
|
|
/**
|
|
* @brief A host *must not* send router advertisements at any time (so why build their options?)
|
|
* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.3.4">
|
|
* RFC 4861, section 6.3.4
|
|
* </a>
|
|
*
|
|
* This macro is primarily an optimization to not go into the function defined
|
|
* above.
|
|
*/
|
|
#define gnrc_ndp_opt_pi_build(prefix_len, flags, valid_ltime, pref_ltime, prefix, next) (NULL)
|
|
|
|
/**
|
|
* @brief A host *must not* send router advertisements at any time (so why build their options?)
|
|
* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.3.4">
|
|
* RFC 4861, section 6.3.4
|
|
* </a>
|
|
*
|
|
* This macro is primarily an optimization to not go into the function defined
|
|
* above.
|
|
*/
|
|
#define gnrc_ndp_opt_mtu_build(mtu, next) (NULL)
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* GNRC_NDP_H */
|
|
/**
|
|
* @}
|
|
*/
|