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/*
* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
*
* 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.
*/
/**
* @defgroup net_gnrc_ndp_internal Internal functions for neighbor discovery.
* @ingroup net_gnrc_ndp
* @brief Internal functions for neighbor discovery.
* @internal
* @note Only for use with a neighbor discovery implementations.
* @{
*
* @file
* @brief Internal neighbor discovery functions for neighbor discovery.
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef GNRC_NDP_INTERNAL_H_
#define GNRC_NDP_INTERNAL_H_
#include "kernel_types.h"
#include "net/gnrc/ipv6/nc.h"
#include "net/ipv6/addr.h"
#include "net/ipv6/hdr.h"
#include "net/ndp.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Get best match from default router list.
*
* @internal
*
* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.3.6">
* RFC 4861, section 6.3.6
* </a>
*
* @return Address to a default router.
* @return NULL, if the default router list is empty.
*/
ipv6_addr_t *gnrc_ndp_internal_default_router(void);
/**
* @brief Sets state of a neighbor cache entry and triggers required actions.
*
* @internal
*
* @param[in] nc_entry A neighbor cache entry.
* @param[in] state The new state for the neighbor cache entry.
*/
void gnrc_ndp_internal_set_state(gnrc_ipv6_nc_t *nc_entry, uint8_t state);
/**
* @brief Send precompiled neighbor solicitation.
*
* @internal
*
* @param[in] iface Interface to send over. May not be KERNEL_PID_UNDEF.
* @param[in] src Source address for the neighbor solicitation. Will be chosen from the
* interface according to @p dst, if NULL.
* @param[in] tgt Target address for the neighbor solicitation. May not be
* NULL.
* @param[in] dst Destination address for neighbor solicitation. May not be
* NULL.
*/
void gnrc_ndp_internal_send_nbr_sol(kernel_pid_t iface, ipv6_addr_t *src, ipv6_addr_t *tgt,
ipv6_addr_t *dst);
/**
* @brief Send precompiled neighbor advertisement.
*
* @internal
*
* @param[in] iface Interface to send over. May not be KERNEL_PID_UNDEF.
* @param[in] tgt Target address for the neighbor solicitation. May
* not be NULL.
* @param[in] dst Destination address for neighbor solicitation. May
* not be NULL.
* @param[in] supply_tl2a Add target link-layer address option to neighbor
* advertisement if link-layer has addresses.
* @param[in] ext_opts External options for the neighbor advertisement. Leave NULL for none.
* **Warning:** these are not tested if they are suitable for a
* neighbor advertisement so be sure to check that.
* **Will be released** in an error case.
*/
void gnrc_ndp_internal_send_nbr_adv(kernel_pid_t iface, ipv6_addr_t *tgt, ipv6_addr_t *dst,
bool supply_tl2a, gnrc_pktsnip_t *ext_opts);
/**
* @brief Send precompiled router solicitation to @p dst.
*
* @internal
*
* @param[in] iface Interface to send over. May not be KERNEL_PID_UNDEF.
* @param[in] dst Destination for the router solicitation. ff02::2 if NULL.
*/
void gnrc_ndp_internal_send_rtr_sol(kernel_pid_t iface, ipv6_addr_t *dst);
#if (defined(MODULE_GNRC_NDP_ROUTER) || defined(MODULE_GNRC_SIXLOWPAN_ND_ROUTER))
/**
* @brief Handles received router solicitations.
*
* @param[in] iface Interface to send over. May not be KERNEL_PID_UNDEF.
* @param[in] src Source address for the router advertisement. May be NULL to be determined
* by source address selection (:: if no @p iface has no address).
* @param[in] dst Destination address for router advertisement.
* @ref IPV6_ADDR_ALL_NODES_LINK_LOCAL if NULL.
* @param[in] fin This is part of the router's final batch of router advertisements
* before ceising to be a router (set's router lifetime field to 0).
*/
void gnrc_ndp_internal_send_rtr_adv(kernel_pid_t iface, ipv6_addr_t *src,
ipv6_addr_t *dst, bool fin);
#else
/**
* @brief A host *must not* send router advertisements at any time.
*
* This macro is primarily an optimization to not go into the function defined
* above.
*/
#define gnrc_ndp_internal_send_rtr_adv(iface, src, dst, fin)
#endif
/**
* @brief Handles a SL2A option.
*
* @param[in] pkt Packet the option was received in.
* @param[in] ipv6 IPv6 header of @p pkt
* @param[in] icmpv6_type ICMPv6 type of the message carrying the option.
* @param[in] tl2a_opt The TL2A option.
* @param[out] l2addr The L2 address carried in the SL2A option.
*
* @return length of the L2 address, on success.
* @return -EINVAL, if SL2A was not valid.
* @return -ENOTSUP, if node should silently ignore the option.
*/
int gnrc_ndp_internal_sl2a_opt_handle(gnrc_pktsnip_t *pkt, ipv6_hdr_t *ipv6, uint8_t icmpv6_type,
ndp_opt_t *sl2a_opt, uint8_t *l2addr);
/**
* @brief Handles a TL2A option.
*
* @param[in] pkt Packet the option was received in.
* @param[in] ipv6 IPv6 header of @p pkt
* @param[in] icmpv6_type ICMPv6 type of the message carrying the option.
* @param[in] tl2a_opt The TL2A option.
* @param[out] l2addr The L2 address carried in the TL2A option.
*
* @return length of the L2 address, on success.
* @return -EINVAL, if TL2A was not valid.
* @return -ENOTSUP, if node should silently ignore the option.
*/
int gnrc_ndp_internal_tl2a_opt_handle(gnrc_pktsnip_t *pkt, ipv6_hdr_t *ipv6,
uint8_t icmpv6_type, ndp_opt_t *tl2a_opt,
uint8_t *l2addr);
/**
* @brief Handles a MTU option.
*
* @internal
*
* @param[in] iface Interface the MTU option was received on.
* @param[in] icmpv6_type ICMPv6 type of the message carrying the option.
* @param[in] mtu_opt A MTU option.
*
* @return true, on success (or if the node should silently ignore the option).
* @return false, if MTU option was not valid.
*/
bool gnrc_ndp_internal_mtu_opt_handle(kernel_pid_t iface, uint8_t icmpv6_type,
ndp_opt_mtu_t *mtu_opt);
/**
* @brief Handles a PI option.
*
* @internal
*
* @param[in] iface Interface the PI option was received on.
* @param[in] icmpv6_type ICMPv6 type of the message carrying the option.
* @param[in] pi_opt A PI option.
*
* @return true, on success (or if the node should silently ignore the option).
* @return false, if PIO was not valid.
*/
bool gnrc_ndp_internal_pi_opt_handle(kernel_pid_t iface, uint8_t icmpv6_type,
ndp_opt_pi_t *pi_opt);
/**
* @brief Resets the gnrc_ipv6_nc_t::nbr_sol_timer.
*
* @internal
*
* @param[in] nc_entry A neighbor cache entry.
* @param[in] delay The delay when the timer should fire.
* @param[in] type The msg_t::type for the timer.
* @param[in] pid The pid of the receiver thread of the msg_t
*/
static inline void gnrc_ndp_internal_reset_nbr_sol_timer(gnrc_ipv6_nc_t *nc_entry, uint32_t delay,
uint16_t type, kernel_pid_t pid)
{
xtimer_remove(&nc_entry->nbr_sol_timer);
nc_entry->nbr_sol_msg.type = type;
xtimer_set_msg(&nc_entry->nbr_sol_timer, delay, &nc_entry->nbr_sol_msg, pid);
}
#ifdef __cplusplus
}
#endif
#endif /* GNRC_NDP_INTERNAL_H_ */
/** @} */
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