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RIOT/sys/include/net/gnrc/ipv6/netif.h
Yonezawa-T2 542e045bba gnrc_ipv6_netif: fixed crash when ENABLE_DEBUG is 1. 
When ENABLE_DEBUG is 1, `out` is dereferenced unconditionally, but
`_parse_options` in `gnrc_rpl_control_messages.c` calls it with NULL.

Clarified `out` must not NULL and fixed `_parse_options`.
2016-01-07 10:08:37 +09:00

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/*
* Copyright (C) 2014 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_ipv6_netif IPv6 network interfaces
* @ingroup net_gnrc_ipv6
* @brief IPv6 specific information on @ref net_gnrc_netif.
* @{
*
* @file
* @brief Definitions for IPv6 specific information of network interfaces.
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef GNRC_IPV6_NETIF_H_
#define GNRC_IPV6_NETIF_H_
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include "kernel_macros.h"
#include "kernel_types.h"
#include "mutex.h"
#include "net/ipv6.h"
#include "net/ipv6/addr.h"
#include "vtimer.h"
#include "xtimer.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @def GNRC_IPV6_NETIF_ADDR_NUMOF
*
* @brief Number of IPv6 addresses per interface.
*/
#ifdef MODULE_GNRC_RPL
/* RPL needs all-RPL-nodes multicast address */
# define GNRC_IPV6_NETIF_RPL_ADDR (1)
#else
# define GNRC_IPV6_NETIF_RPL_ADDR (0)
#endif
#ifdef MODULE_GNRC_IPV6_ROUTER
/* routers need all-routers multicast address */
# define GNRC_IPV6_NETIF_RTR_ADDR (1)
#else
# define GNRC_IPV6_NETIF_RTR_ADDR (0)
#endif
#ifndef GNRC_IPV6_NETIF_ADDR_NUMOF
#define GNRC_IPV6_NETIF_ADDR_NUMOF (6 + GNRC_IPV6_NETIF_RPL_ADDR + GNRC_IPV6_NETIF_RTR_ADDR)
#endif
/**
* @brief Default MTU
*
* An interface will choose this MTU if the link-layer's maximum packet size
* (see @ref NETOPT_MAX_PACKET_SIZE) is lesser than the @ref IPV6_MIN_MTU or if it just not
* provide it. For RFC-compatible communication it must be at least @ref IPV6_MIN_MTU.
*
* @note If the scenario the node is used in allows for it and the packet size is predictable,
* a user might choose to set @ref GNRC_IPV6_NETIF_DEFAULT_MTU to a lesser value than
* @ref IPV6_MIN_MTU to optimize for code size (e.g. because it is then possible to omit
* @ref net_gnrc_sixlowpan_frag) and memory usage (e.g. because @ref GNRC_PKTBUF_SIZE
* can be much smaller).
*/
#ifndef GNRC_IPV6_NETIF_DEFAULT_MTU
#define GNRC_IPV6_NETIF_DEFAULT_MTU (IPV6_MIN_MTU)
#endif
/**
* @brief Default hop limit
*
* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.3.2">
* RFC 4861, section 6.3.2
* </a>
* @see <a href="http://www.iana.org/assignments/ip-parameters/ip-parameters.xhtml#ip-parameters-2">
* IANA, IP TIME TO LIVE PARAMETER
* </a>
*/
#define GNRC_IPV6_NETIF_DEFAULT_HL (64)
/**
* @name Default values for router configuration
* @{
* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.2.1">
* RFC 4861, section 6.2.1
* </a>
*/
/**
* @brief Maximum time in seconds between sending unsolicited multicast router advertisements.
*/
#define GNRC_IPV6_NETIF_DEFAULT_MAX_ADV_INT (600U)
/**
* @brief Minimum time in seconds between sending unsolicited multicast router advertisements.
*/
#define GNRC_IPV6_NETIF_DEFAULT_MIN_ADV_INT (200U)
/**
* @brief The router lifetime to propagate in router advertisements.
*/
#define GNRC_IPV6_NETIF_DEFAULT_ROUTER_LTIME (1800U)
/** @} */
/**
* @{
* @name Flags for a registered IPv6 address.
* @brief Needed primarily to identify addresses as either anycast or unicast.
*
* @see <a href="https://tools.ietf.org/html/rfc4291#section-2.6">
* RFC 4291, section 2.6
* </a>
*/
#define GNRC_IPV6_NETIF_ADDR_FLAGS_UNICAST (0x00) /**< unicast address */
#define GNRC_IPV6_NETIF_ADDR_FLAGS_NON_UNICAST (0x01) /**< non-unicast address */
/**
* @brief A prefix information option that propagates the prefix of this
* address should set the autonomous flag.
* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.2.1">
* RFC 4861, section 6.2.1
* </a>
*/
#define GNRC_IPV6_NETIF_ADDR_FLAGS_NDP_AUTO (0x40)
/**
* @brief A prefix information option that propagates the prefix of this
* address should set the on-link flag.
* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.2.1">
* RFC 4861, section 6.2.1
* </a>
*/
#define GNRC_IPV6_NETIF_ADDR_FLAGS_NDP_ON_LINK (0x80)
/**
* @}
*/
/**
* @{
* @name Flags for the interfaces
*
* @note The most-significant byte of these flags is identical to the flags in
* IPv6 router advertisements. See <a
* href="https://tools.ietf.org/html/rfc4861#section-4.2">RFC4861,
* section 4.2</a>, <a
* href="https://tools.ietf.org/html/rfc6275#section-7.1">RFC6275,
* section 7.1</a>, <a
* href="https://tools.ietf.org/html/rfc4191#section-2.2">RFC4191,
* section 2.2</a>, and <a
* href="https://tools.ietf.org/html/rfc4389#section-4.1.3.3">RFC4389,
* section 4.1.3.3</a>.
*/
/**
* @brief Interface is 6LoWPAN interface.
*/
#define GNRC_IPV6_NETIF_FLAGS_SIXLOWPAN (0x0001)
/**
* @brief Flag to indicate that routing is enabled on the interface.
*/
#define GNRC_IPV6_NETIF_FLAGS_ROUTER (0x0002)
/**
* @brief Flag to indicate that the interface sends periodic router
* advertisements and in response to router solicitations.
*/
#define GNRC_IPV6_NETIF_FLAGS_RTR_ADV (0x0004)
/**
* @brief Flag to indicate that gnrc_ipv6_netif_t::mtu shall be propagated
* with the MTU options in router advertisements.
*/
#define GNRC_IPV6_NETIF_FLAGS_ADV_MTU (0x0008)
/**
* @brief Flag to indicate that gnrc_ipv6_netif_t::cur_hl shall be propagated
* in router advertisements.
*/
#define GNRC_IPV6_NETIF_FLAGS_ADV_CUR_HL (0x0010)
/**
* @brief Flag to indicate that gnrc_ipv6_netif_t::reach_time shall be propagated
* in router advertisements.
*/
#define GNRC_IPV6_NETIF_FLAGS_ADV_REACH_TIME (0x0020)
/**
* @brief Flag to indicate that ng_ipv6_netif_t::retrans_timer shall be propagated
* in router advertisements.
*/
#define GNRC_IPV6_NETIF_FLAGS_ADV_RETRANS_TIMER (0x0040)
/**
* @brief Flag to indicate if the interface is operating over a wired link
*/
#define GNRC_IPV6_NETIF_FLAGS_IS_WIRED (0x0080)
/**
* @brief Offset of the router advertisement flags compared to the position in router
* advertisements.
*/
#define GNRC_IPV6_NETIF_FLAGS_RTR_ADV_POS (8U)
/**
* @brief Mask for flags intended for router advertisements.
* @note Please expand if more router advertisement flags are introduced.
*/
#define GNRC_IPV6_NETIF_FLAGS_RTR_ADV_MASK (0xc000)
/**
* @brief Flag to indicate that the interface has other address
* configuration.
*/
#define GNRC_IPV6_NETIF_FLAGS_OTHER_CONF (0x4000)
/**
* @brief Flag to indicate that the interface has managed address
* configuration (e.g. via DHCPv6).
*/
#define GNRC_IPV6_NETIF_FLAGS_MANAGED (0x8000)
/**
* @}
*/
/**
* @brief Type to represent an IPv6 address registered to an interface.
*/
typedef struct {
ipv6_addr_t addr; /**< The address data */
uint8_t flags; /**< flags */
uint8_t prefix_len; /**< length of the prefix of the address */
/**
* @{
* @name Neigbour discovery variables for prefixes
* @see <a href="https://tools.ietf.org/html/rfc4861#section-6.2.1">
* RFC 4861, section 6.2.1
* </a>
*/
/**
* @brief The time in seconds this address is valid. If it is UINT32_MAX
* the lifetime is infinite.
*/
uint32_t valid;
/**
* @brief The length of time that this address remains preferred.
* If it is UINT32_MAX the lifetime is infinite.
* It **must** be < gnrc_ipv6_netif_addr_t::valid.
*/
uint32_t preferred;
/**
* @brief Validity timeout timer.
*/
xtimer_t valid_timeout;
msg_t valid_timeout_msg; /**< msg_t for gnrc_ipv6_netif_addr_t::valid_timeout */
/**
* @}
*/
} gnrc_ipv6_netif_addr_t;
/**
* @brief Definition of IPv6 interface type.
*/
typedef struct {
/**
* @brief addresses registered to the interface
*/
gnrc_ipv6_netif_addr_t addrs[GNRC_IPV6_NETIF_ADDR_NUMOF];
mutex_t mutex; /**< mutex for the interface */
kernel_pid_t pid; /**< PID of the interface */
uint16_t flags; /**< flags for 6LoWPAN and Neighbor Discovery */
uint16_t mtu; /**< Maximum Transmission Unit (MTU) of the interface */
uint8_t cur_hl; /**< current hop limit for the interface */
#if defined(MODULE_GNRC_NDP_HOST) || defined(MODULE_GNRC_SIXLOWPAN_ND)
/**
* @brief Counter for send router solicitations.
*/
uint8_t rtr_sol_count;
#endif
#ifdef MODULE_GNRC_NDP_ROUTER
/**
* @brief Counter for initial router advertisements.
*/
uint8_t rtr_adv_count;
/**
* @brief Maximum time in seconds between sending unsolicited multicast
* router advertisements. Must be between 4 and 1800 seconds.
* The default value is @ref GNRC_IPV6_NETIF_DEFAULT_MAX_ADV_INT.
*/
uint16_t max_adv_int;
/**
* @brief Minimum time in seconds between sending unsolicited multicast
* router advertisements. Must be between 3 and
* 3/4 * ng_ipv6_netif_t::max_adv_int seconds.
* The default value is @ref GNRC_IPV6_NETIF_DEFAULT_MIN_ADV_INT.
*/
uint16_t min_adv_int;
#endif
#if defined (MODULE_GNRC_NDP_ROUTER) || defined (MODULE_GNRC_SIXLOWPAN_ND_ROUTER)
/**
* @brief The router lifetime to propagate in router advertisements.
* Must be either 0 or between ng_ipv6_netif_t::max_adv_int and
* 9000 seconds. 0 means this router is not to be used as a default
* router. The default value is @ref GNRC_IPV6_NETIF_DEFAULT_ROUTER_LTIME.
*/
uint16_t adv_ltime;
#endif
/**
* @brief Base value in microseconds for computing random
* gnrc_ipv6_netif_t::reach_time.
* The default value is @ref GNRC_NDP_REACH_TIME.
*/
uint32_t reach_time_base;
/**
* @brief The time a neighbor is considered reachable after receiving
* a reachability confirmation.
* Should be uniformly distributed between @ref GNRC_NDP_MIN_RAND
* and GNRC_NDP_MAX_RAND multiplied with
* gnrc_ipv6_netif_t::reach_time_base microseconds devided by 10.
* Can't be greater than 1 hour.
*/
uint32_t reach_time;
/**
* @brief Time between retransmissions of neighbor solicitations to a
* neighbor.
* The default value is @ref GNRC_NDP_RETRANS_TIMER.
*/
uint32_t retrans_timer;
xtimer_t rtr_sol_timer; /**< Timer for periodic router solicitations */
msg_t rtr_sol_msg; /**< msg_t for gnrc_ipv6_netif_t::rtr_sol_timer */
#if defined (MODULE_GNRC_NDP_ROUTER) || defined (MODULE_GNRC_SIXLOWPAN_ND_ROUTER)
xtimer_t rtr_adv_timer; /**< Timer for periodic router advertisements */
msg_t rtr_adv_msg; /**< msg_t for gnrc_ipv6_netif_t::rtr_adv_timer */
#endif
} gnrc_ipv6_netif_t;
/**
* @brief Initializes the module.
*/
void gnrc_ipv6_netif_init(void);
/**
* @brief Add interface to IPv6.
*
* @details This function will be called by @ref gnrc_netif_add().
*
* @param[in] pid The PID to the interface.
*/
void gnrc_ipv6_netif_add(kernel_pid_t pid);
/**
* @brief Remove interface from IPv6.
*
* @details This function will be called by @ref gnrc_netif_remove().
*
* @param[in] pid The PID to the interface.
*/
void gnrc_ipv6_netif_remove(kernel_pid_t pid);
/**
* @brief Get interface.
*
* @param[in] pid The PID to the interface.
*
* @return The interface describing structure, on success.
* @return NULL, if there is no interface with PID @p pid.
*/
gnrc_ipv6_netif_t *gnrc_ipv6_netif_get(kernel_pid_t pid);
#if (defined(MODULE_GNRC_NDP_ROUTER) || defined(MODULE_GNRC_SIXLOWPAN_ND_ROUTER))
/**
* @brief Set interface to router mode.
*
* @details This sets/unsets the GNRC_IPV6_NETIF_FLAGS_ROUTER and initializes
* or ceases router behavior for neighbor discovery.
*
* @param[in] netif The interface.
* @param[in] enable Status for the GNRC_IPV6_NETIF_FLAGS_ROUTER flag.
*/
void gnrc_ipv6_netif_set_router(gnrc_ipv6_netif_t *netif, bool enable);
/**
* @brief Set interface to router advertisement mode.
*
* @details If GNRC_IPV6_NETIF_FLAGS_ROUTER is set this sets/unsets the
* GNRC_IPV6_NETIF_FLAGS_RTR_ADV and initializes or ceases router
* advertising behavior for neighbor discovery.
*
* @param[in] netif The interface.
* @param[in] enable Status for the GNRC_IPV6_NETIF_FLAGS_RTR flag.
*/
void gnrc_ipv6_netif_set_rtr_adv(gnrc_ipv6_netif_t *netif, bool enable);
#else
/* dummy macros to be able to "call" these functions when none of the relevant modules
* is implemented */
#define gnrc_ipv6_netif_set_router(netif, enable)
#define gnrc_ipv6_netif_set_rtr_adv(netif, enable)
#endif
/**
* @brief Adds an address to an interface.
*
* @param[in] pid The PID to the interface.
* @param[in] addr An address you want to add to the interface.
* @param[in] prefix_len Length of the prefix of the address.
* Must be between 1 and 128.
* @param[in] flags Flags for the address entry
* If @p addr should be an anycast address, @p flags
* must have @ref GNRC_IPV6_NETIF_ADDR_FLAGS_NON_UNICAST
* set. Otherwise leave it unset.
* If @p addr is a multicast address, the status of
* @ref GNRC_IPV6_NETIF_ADDR_FLAGS_NON_UNICAST will be
* ignored and set in either case.
*
* @see <a href="https://tools.ietf.org/html/rfc4291#section-2.6">
* RFC 4291, section 2.6
* </a>
*
* @return The address on the interface, on success.
* @return NULL, on failure
*/
ipv6_addr_t *gnrc_ipv6_netif_add_addr(kernel_pid_t pid, const ipv6_addr_t *addr, uint8_t prefix_len,
uint8_t flags);
/**
* @brief Remove an address from the interface.
*
* @param[in] pid The PID to the interface. If @p pid is KERNEL_PID_UNDEF
* it will be removed from all interfaces.
* @param[in] addr An address you want to remove from interface.
*/
void gnrc_ipv6_netif_remove_addr(kernel_pid_t pid, ipv6_addr_t *addr);
/**
* @brief Removes all addresses from the interface.
*
* @param[in] pid The PID to the interface.
*/
void gnrc_ipv6_netif_reset_addr(kernel_pid_t pid);
/**
* @brief Searches for an address on all interfaces.
*
* @param[out] out The reference to the address on the interface.
* @param[in] addr The address you want to search for.
*
* @return The PID to the interface the address is registered to.
* @return KERNEL_PID_UNDEF, if the address can not be found on any interface.
*/
kernel_pid_t gnrc_ipv6_netif_find_by_addr(ipv6_addr_t **out, const ipv6_addr_t *addr);
/**
* @brief Searches for an address on an interface.
*
* @param[in] pid The PID to the interface.
* @param[in] addr The address you want to search for.
*
* @return The reference to the address on the interface.
* @return NULL, if the address can not be found on the interface.
* @return NULL, if @p pid is no interface.
*/
ipv6_addr_t *gnrc_ipv6_netif_find_addr(kernel_pid_t pid, const ipv6_addr_t *addr);
/**
* @brief Searches for the first address matching a prefix best on all
* interfaces.
*
* @param[out] out The reference to the found address on the interface.
* Must be a pointer to NULL on calling and may stay
* unchanged if no match can be found.
*
* @param[in] prefix The prefix you want to search for.
*
* @pre @p out must not be NULL.
*
* @return The PID to the interface the address is registered to.
* @return KERNEL_PID_UNDEF, if no matching address can not be found on any
* interface.
*/
kernel_pid_t gnrc_ipv6_netif_find_by_prefix(ipv6_addr_t **out, const ipv6_addr_t *prefix);
/**
* @brief Searches for the first address matching a prefix best on an
* interface.
*
* @param[in] pid The PID to the interface.
* @param[in] prefix The prefix you want to search for.
*
* @return The reference to the found address on the interface.
* @return NULL, if no matching address can be found on the interface.
* @return NULL, if @p pid is no interface.
*/
ipv6_addr_t *gnrc_ipv6_netif_match_prefix(kernel_pid_t pid, const ipv6_addr_t *prefix);
/**
* @brief Searches for the best address on an interface usable as a
* source address for a given destination address.
*
* @param[in] pid The PID to the interface.
* @param[in] dest The destination address you want to find a destination
* address for.
*
* @todo Rule 4 from RFC 6724 is currently not implemented. Has to updated as
* soon as gnrc supports Mobile IP.
*
* @todo Rule 6 from RFC 6724 is currently not implemented. Has to updated as
* soon as gnrc supports flow labels.
*
* @todo Rule 7 from RFC 6724 is currently not implemented. Has to updated as
* soon as gnrc supports temporary addresses.
*
* @return The reference to the found address on the interface.
* @return NULL, if no matching address can be found on the interface.
* @return NULL, if @p pid is no interface.
*/
ipv6_addr_t *gnrc_ipv6_netif_find_best_src_addr(kernel_pid_t pid, const ipv6_addr_t *dest);
/**
* @brief Get interface specific meta-information on an address
*
* @details This only works with addresses you retrieved via the following
* functions:
*
* * gnrc_ipv6_netif_add_addr()
* * gnrc_ipv6_find_addr()
* * gnrc_ipv6_find_addr_local()
* * gnrc_ipv6_find_prefix_match()
* * gnrc_ipv6_find_prefix_match_local()
* * gnrc_ipv6_find_best_src_address()
*
* The behaviour for other addresses is undefined.
*
* @param[in] addr The address you want to get the meta-information for.
*
* @return Interface specific meta-information on @p addr
*/
static inline gnrc_ipv6_netif_addr_t *gnrc_ipv6_netif_addr_get(const ipv6_addr_t *addr)
{
return container_of(addr, gnrc_ipv6_netif_addr_t, addr);
}
/**
* @brief Checks if an address is non-unicast.
*
* @details This only works with addresses you retrieved via the following
* functions:
*
* * gnrc_ipv6_netif_add_addr()
* * gnrc_ipv6_find_addr()
* * gnrc_ipv6_find_addr_local()
* * gnrc_ipv6_find_prefix_match()
* * gnrc_ipv6_find_prefix_match_local()
* * gnrc_ipv6_find_best_src_address()
*
* The behaviour for other addresses is undefined.
*
* @param[in] addr The address you want to check.
*
* @return true, if address is anycast or multicast.
* @return false, if address is unicast.
*/
static inline bool gnrc_ipv6_netif_addr_is_non_unicast(const ipv6_addr_t *addr)
{
return (bool)(container_of(addr, gnrc_ipv6_netif_addr_t, addr)->flags &
GNRC_IPV6_NETIF_ADDR_FLAGS_NON_UNICAST);
}
/**
* @brief Initializes an interface with device-dependent values.
*
* @note Must be called after all interfaces were initialized and must not
* be called in an interface's thread (will otherwise hang up).
*/
void gnrc_ipv6_netif_init_by_dev(void);
#ifdef __cplusplus
}
#endif
#endif /* NETIF_H_ */
/**
* @}
*/
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