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/** @file
@brief IPv6 data handler
This is not to be included by the application.
*/
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __IPV6_H
#define __IPV6_H
#include <stdint.h>
#include <net/net_ip.h>
#include <net/nbuf.h>
#include <net/net_if.h>
#include <net/net_context.h>
#include "icmpv6.h"
#include "nbr.h"
#define NET_IPV6_ND_HOP_LIMIT 255
#define NET_IPV6_ND_INFINITE_LIFETIME 0xFFFFFFFF
#define NET_IPV6_DEFAULT_PREFIX_LEN 64
#define NET_MAX_RS_COUNT 3
/**
* @brief Bitmaps for IPv6 extension header processing
*
* When processing extension headers, we record which one we have seen.
* This is done as the network packet cannot have twice the same header,
* except for destination option. This information is stored in bitfield variable.
* The order of the bitmap is the order recommended in RFC 2460.
*/
#define NET_IPV6_EXT_HDR_BITMAP_HBHO 0x01
#define NET_IPV6_EXT_HDR_BITMAP_DESTO1 0x02
#define NET_IPV6_EXT_HDR_BITMAP_ROUTING 0x04
#define NET_IPV6_EXT_HDR_BITMAP_FRAG 0x08
#define NET_IPV6_EXT_HDR_BITMAP_AH 0x10
#define NET_IPV6_EXT_HDR_BITMAP_ESP 0x20
#define NET_IPV6_EXT_HDR_BITMAP_DESTO2 0x40
/**
* @brief Destination and Hop By Hop extension headers option types
*/
#define NET_IPV6_EXT_HDR_OPT_PAD1 0
#define NET_IPV6_EXT_HDR_OPT_PADN 1
#define NET_IPV6_EXT_HDR_OPT_RPL 0x63
/**
* @brief Multicast Listener Record v2 record types.
*/
#define NET_IPV6_MLDv2_MODE_IS_INCLUDE 1
#define NET_IPV6_MLDv2_MODE_IS_EXCLUDE 2
#define NET_IPV6_MLDv2_CHANGE_TO_INCLUDE_MODE 3
#define NET_IPV6_MLDv2_CHANGE_TO_EXCLUDE_MODE 4
#define NET_IPV6_MLDv2_ALLOW_NEW_SOURCES 5
#define NET_IPV6_MLDv2_BLOCK_OLD_SOURCES 6
/* State of the neighbor */
enum net_ipv6_nbr_state {
NET_IPV6_NBR_STATE_INCOMPLETE,
NET_IPV6_NBR_STATE_REACHABLE,
NET_IPV6_NBR_STATE_STALE,
NET_IPV6_NBR_STATE_DELAY,
NET_IPV6_NBR_STATE_PROBE,
};
const char *net_ipv6_nbr_state2str(enum net_ipv6_nbr_state state);
/**
* @brief IPv6 neighbor information.
*/
struct net_ipv6_nbr_data {
/** Any pending buffer waiting ND to finish. */
struct net_buf *pending;
/** IPv6 address. */
struct in6_addr addr;
/** Reachable timer. */
struct k_delayed_work reachable;
/** Neighbor Solicitation timer for DAD */
struct k_delayed_work send_ns;
/** State of the neighbor discovery */
enum net_ipv6_nbr_state state;
/** Link metric for the neighbor */
uint16_t link_metric;
/** How many times we have sent NS */
uint8_t ns_count;
/** Is the neighbor a router */
bool is_router;
};
static inline struct net_ipv6_nbr_data *net_ipv6_nbr_data(struct net_nbr *nbr)
{
return (struct net_ipv6_nbr_data *)nbr->data;
}
/**
* @brief Return IPv6 neighbor according to ll index.
*
* @param idx Neighbor index in link layer table.
*
* @return Return IPv6 neighbor information.
*/
struct net_ipv6_nbr_data *net_ipv6_get_nbr_by_index(uint8_t idx);
#if defined(CONFIG_NET_IPV6_DAD)
int net_ipv6_start_dad(struct net_if *iface, struct net_if_addr *ifaddr);
#endif
int net_ipv6_send_ns(struct net_if *iface, struct net_buf *pending,
struct in6_addr *src, struct in6_addr *dst,
struct in6_addr *tgt, bool is_my_address);
int net_ipv6_send_rs(struct net_if *iface);
int net_ipv6_start_rs(struct net_if *iface);
int net_ipv6_send_na(struct net_if *iface, struct in6_addr *src,
struct in6_addr *dst, struct in6_addr *tgt,
uint8_t flags);
/**
* @brief Create IPv6 packet in provided net_buf.
*
* @param buf Network buffer
* @param src Source IPv6 address
* @param dst Destination IPv6 address
* @param iface Network interface
* @param next_header Protocol type of the next header after IPv6 header.
*
* @return Return network buffer that contains the IPv6 packet.
*/
struct net_buf *net_ipv6_create_raw(struct net_buf *buf,
const struct in6_addr *src,
const struct in6_addr *dst,
struct net_if *iface,
uint8_t next_header);
/**
* @brief Create IPv6 packet in provided net_buf.
*
* @param context Network context for a connection
* @param buf Network buffer
* @param src_addr Source address, or NULL to choose a default from context
* @param dst_addr Destination IPv6 address
*
* @return Return network buffer that contains the IPv6 packet.
*/
struct net_buf *net_ipv6_create(struct net_context *context,
struct net_buf *buf,
const struct in6_addr *src_addr,
const struct in6_addr *dst_addr);
/**
* @brief Finalize IPv6 packet. It should be called right before
* sending the packet and after all the data has been added into
* the packet. This function will set the length of the
* packet and calculate the higher protocol checksum if needed.
*
* @param buf Network buffer
* @param next_header Protocol type of the next header after IPv6 header.
*
* @return Return 0 on Success, < 0 on Failure.
*/
int net_ipv6_finalize_raw(struct net_buf *buf, uint8_t next_header);
/**
* @brief Finalize IPv6 packet. It should be called right before
* sending the packet and after all the data has been added into
* the packet. This function will set the length of the
* packet and calculate the higher protocol checksum if needed.
*
* @param context Network context for a connection
* @param buf Network buffer
*
* @return Return 0 on Success, < 0 on Failure.
*/
int net_ipv6_finalize(struct net_context *context, struct net_buf *buf);
#if defined(CONFIG_NET_IPV6_MLD)
/**
* @brief Join a given multicast group.
*
* @param iface Network interface where join message is sent
* @param addr Multicast group to join
*
* @return Return 0 if joining was done, <0 otherwise.
*/
int net_ipv6_mld_join(struct net_if *iface, const struct in6_addr *addr);
/**
* @brief Leave a given multicast group.
*
* @param iface Network interface where leave message is sent
* @param addr Multicast group to leave
*
* @return Return 0 if leaving is done, <0 otherwise.
*/
int net_ipv6_mld_leave(struct net_if *iface, const struct in6_addr *addr);
#else
#define net_ipv6_mld_join(...)
#define net_ipv6_mld_leave(...)
#endif /* CONFIG_NET_IPV6_MLD */
/**
* @typedef net_nbr_cb_t
* @brief Callback used while iterating over neighbors.
*
* @param nbr A valid pointer on current neighbor.
* @param user_data A valid pointer on some user data or NULL
*/
typedef void (*net_nbr_cb_t)(struct net_nbr *nbr, void *user_data);
#if defined(CONFIG_NET_IPV6_NBR_CACHE)
/**
* @brief Make sure the link layer address is set according to
* destination address. If the ll address is not yet known, then
* start neighbor discovery to find it out. If ND needs to be done
* then the returned packet is the Neighbor Solicitation message
* and the original message is sent after Neighbor Advertisement
* message is received.
*
* @param buf Network buffer
*
* @return Return network buffer to be sent.
*/
struct net_buf *net_ipv6_prepare_for_send(struct net_buf *buf);
/**
* @brief Look for a neighbour from it's address on an iface
*
* @param iface A valid pointer on a network interface
* @param addr The IPv6 address to match
*
* @return A valid pointer on a neighbour on success, NULL otherwise
*/
struct net_nbr *net_ipv6_nbr_lookup(struct net_if *iface,
struct in6_addr *addr);
/**
* @brief Get neighbor from its index.
*
* @param iface Network interface to match. If NULL, then use
* whatever interface there is configured for the neighbor address.
* @param idx Index of the link layer address in the address array
*
* @return A valid pointer on a neighbour on success, NULL otherwise
*/
struct net_nbr *net_ipv6_get_nbr(struct net_if *iface, uint8_t idx);
/**
* @brief Look for a neighbour from it's link local address index
*
* @param iface Network interface to match. If NULL, then use
* whatever interface there is configured for the neighbor address.
* @param idx Index of the link layer address in the address array
*
* @return A valid pointer on a neighbour on success, NULL otherwise
*/
struct in6_addr *net_ipv6_nbr_lookup_by_index(struct net_if *iface,
uint8_t idx);
/**
* @brief Add a neighbour to neighbor cache
*
* @param iface A valid pointer on a network interface
* @param addr Neighbor IPv6 address
* @param lladdr Neighbor link layer address
* @param is_router Set to true if the neighbor is a router, false
* otherwise
* @param state Initial state of the neighbor entry in the cache
*
* @return A valid pointer on a neighbour on success, NULL otherwise
*/
struct net_nbr *net_ipv6_nbr_add(struct net_if *iface,
struct in6_addr *addr,
struct net_linkaddr *lladdr,
bool is_router,
enum net_ipv6_nbr_state state);
/**
* @brief Remove a neighbour from neighbor cache.
*
* @param iface A valid pointer on a network interface
* @param addr Neighbor IPv6 address
*
* @return True if neighbor could be removed, False otherwise
*/
bool net_ipv6_nbr_rm(struct net_if *iface, struct in6_addr *addr);
/**
* @brief Go through all the neighbors and call callback for each of them.
*
* @param cb User supplied callback function to call.
* @param user_data User specified data.
*/
void net_ipv6_nbr_foreach(net_nbr_cb_t cb, void *user_data);
#else /* CONFIG_NET_IPV6_NBR_CACHE */
static inline struct net_buf *net_ipv6_prepare_for_send(struct net_buf *buf)
{
return buf;
}
static inline struct net_nbr *net_ipv6_nbr_lookup(struct net_if *iface,
struct in6_addr *addr)
{
return NULL;
}
static inline
struct in6_addr *net_ipv6_nbr_lookup_by_index(struct net_if *iface,
uint8_t idx)
{
return NULL;
}
static inline struct net_nbr *net_ipv6_nbr_add(struct net_if *iface,
struct in6_addr *addr,
struct net_linkaddr *lladdr,
bool is_router,
enum net_ipv6_nbr_state state)
{
return NULL;
}
static inline bool net_ipv6_nbr_rm(struct net_if *iface, struct in6_addr *addr)
{
return true;
}
static inline void net_ipv6_nbr_foreach(net_nbr_cb_t cb, void *user_data)
{
return;
}
#endif /* CONFIG_NET_IPV6_NBR_CACHE */
#if defined(CONFIG_NET_IPV6_ND)
/**
* @brief Set the neighbor reachable timer.
*
* @param iface A valid pointer on a network interface
* @param nbr Neighbor struct pointer
*/
void net_ipv6_nbr_set_reachable_timer(struct net_if *iface,
struct net_nbr *nbr);
#else /* CONFIG_NET_IPV6_ND */
static inline void net_ipv6_nbr_set_reachable_timer(struct net_if *iface,
struct net_nbr *nbr)
{
}
#endif
#if defined(CONFIG_NET_IPV6)
void net_ipv6_init(void);
#else
#define net_ipv6_init(...)
#endif
#endif /* __IPV6_H */