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RIOT/sys/net/include/sixlowpan/ip.h

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/*
* Copyright (C) 2013 INRIA.
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @defgroup net_sixlowpan_ip IPv6
* @ingroup net_sixlowpan
* @brief Internet Protocol version 6
* @{
*
* @file include/sixlowpan/ip.h
* @brief 6LoWPAN constants, data structs, and prototypes for network layer
*
* @author Stephan Zeisberg <zeisberg@mi.fu-berlin.de>
* @author Martin Lenders <mlenders@inf.fu-berlin.de>
* @author Eric Engel <eric.engel@fu-berlin.de>
* @author Oliver Gesch <oliver.gesch@googlemail.com>
*/
#ifndef SIXLOWPAN_IP_H
#define SIXLOWPAN_IP_H
#include <stdint.h>
#include "inet_ntop.h"
#include "net_if.h"
#include "net_help.h"
#include "sixlowpan/types.h"
/**
* @brief IPv6 maximum transmission unit.
*/
#define IPV6_MTU (256)
/**
* @brief Length of an IPv6 address in byte.
*/
#define IPV6_ADDR_LEN (16)
/**
* @brief Length of an IPv6 address in bit.
*/
#define IPV6_ADDR_BIT_LEN (128)
/**
* @brief Maximum length of an IPv6 address represented as string.
*/
#define IPV6_MAX_ADDR_STR_LEN (40)
/**
* @brief L4 protocol number for TCP.
*/
#define IPV6_PROTO_NUM_TCP (6)
/**
* @brief L4 protocol number for UDP.
*/
#define IPV6_PROTO_NUM_UDP (17)
/**
* @brief L4 protocol number for ICMPv6.
*/
#define IPV6_PROTO_NUM_ICMPV6 (58)
/**
* @brief L4 protocol number for no L4 protocol in IPv6.
*/
#define IPV6_PROTO_NUM_NONE (59)
/**
* @brief L4 protocol number for IPv6 destination options.
*/
#define IPV6_PROTO_NUM_IPV6_OPTS (60)
/**
* @brief message type for notification
*
* @see ipv6_register_packet_handler()
*/
#define IPV6_PACKET_RECEIVED (UPPER_LAYER_2)
/**
* @brief Get IPv6 send/receive buffer.
*
* @return Pointer to IPv6 header in send/receive bouffer.
* @note To be deleted in later releases. Here only because it is
* used by the rpl module.
*/
ipv6_hdr_t *ipv6_get_buf(void);
/**
* @brief Send IPv6 packet to dest.
*
* @param[in] dest Destination of this packet.
* @param[in] next_header Next header ID of payload.
* @param[in] payload Payload of the packet.
* @param[in] payload_length Length of payload.
*
* @return payload_length : on success
* -1 : if no route to the given dest could be obtained
* Packet is dropped
* In case of reactive routing: routing
* is going to try to find a route
*/
int ipv6_sendto(const ipv6_addr_t *dest, uint8_t next_header,
const uint8_t *payload, uint16_t payload_length);
/**
* @brief Send an IPv6 packet defined by its header.
*
* @param[in] packet Pointer to an prepared IPv6 packet header.
* The payload is expected directly after the
* packet.
*
* @return length of payload : on success
* -1 : if no route to the given dest could be obtained
* Packet is dropped
* In case of reactive routing: routing is going
* to try to find a route
*/
int ipv6_send_packet(ipv6_hdr_t *packet);
/**
* @brief Determines if node is a router.
*
* @return 1 if node is router, 0 otherwise.
*/
uint8_t ipv6_is_router(void);
/**
* @brief Sets the default hop limit to use with IPv6 packets.
*
* @param[in] hop_limit The hop limit to set the default hop limit to.
*/
void ipv6_set_default_hop_limit(uint8_t hop_limit);
/**
* @brief Gets the default hop limit that is used for IPv6 packets.
*
* @return The current default hop limit for IPv6 packets.
*/
uint8_t ipv6_get_default_hop_limit(void);
/**
* @brief Registers a handler thread for incoming IP packets.
*
* @param[in] pid PID of handler thread.
*
* @return 0 on success, ENOMEN if maximum number of registrable
* threads is exceeded.
*/
uint8_t ipv6_register_packet_handler(int pid);
/**
* @brief Registers a handler thread for L4 protocol.
*
* @param[in] next_header Next header ID of the L4 protocol.
* @param[in] pid PID of the handler thread
*/
void ipv6_register_next_header_handler(uint8_t next_header, int pid);
/**
* @brief Registers a handler thread for RPL options
*
* @param[in] pid PID of the handler thread.
*/
void ipv6_register_rpl_handler(int pid);
/**
* @brief Sets the first 64 bit of *ipv6_addr* to link local prefix.
*
* @param[in,out] ipv6_addr The address to set.
*/
static inline void ipv6_addr_set_link_local_prefix(ipv6_addr_t *ipv6_addr)
{
ipv6_addr->uint32[0] = HTONL(0xfe800000);
ipv6_addr->uint32[1] = 0;
}
/**
* @brief Sets IPv6 address *out* according to the remaining
* parameters.
*
* @param[out] out The resulting address.
* @param[in] addr0 The first 16 bit of the new address.
* @param[in] addr1 The second 16 bit of the new address.
* @param[in] addr2 The third 16 bit of the new address.
* @param[in] addr3 The fourth 16 bit of the new address.
* @param[in] addr4 The fifth 16 bit of the new address.
* @param[in] addr5 The sixth 16 bit of the new address.
* @param[in] addr6 The seventh 16 bit of the new address.
* @param[in] addr7 The eighth 16 bit of the new address.
*/
void ipv6_addr_init(ipv6_addr_t *out, uint16_t addr0, uint16_t addr1,
uint16_t addr2, uint16_t addr3, uint16_t addr4,
uint16_t addr5, uint16_t addr6, uint16_t addr7);
/**
* @brief Sets IPv6 address *out* using the given *prefix* and an interface's
* EUI-64.
*
*
* @param[out] out Address to be set.
* @param[in] if_id The interface to take the EUI-64 from.
* @param[in] prefix 64-bit network prefix to be used for *out*
* (only the first 64 bit of the ipv6_addr_t type
* are copied to *out*)
*
* @return The Address to be set on success, NULL on error.
*/
ipv6_addr_t *ipv6_addr_set_by_eui64(ipv6_addr_t *out, int if_id,
const ipv6_addr_t *prefix);
/**
* @brief Sets IPv6 address *out* with the first *bits* bit taken
* from *prefix* and the remaining bits to 0.
*
* @param[out] out Prefix to be set.
* @param[in] prefix Address to take prefix from.
* @param[in] bits Bits to be copied from *prefix* to *out*
* (set to 128 when greater than 128).
*/
void ipv6_addr_init_prefix(ipv6_addr_t *out, const ipv6_addr_t *prefix,
uint8_t bits);
/**
* @brief Set *ipv6_addr* to the loopback address.
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[out] ipv6_addr Is set to the loopback address.
*/
static inline void ipv6_addr_set_loopback_addr(ipv6_addr_t *ipv6_addr)
{
ipv6_addr->uint32[0] = 0;
ipv6_addr->uint32[1] = 0;
ipv6_addr->uint32[2] = 0;
ipv6_addr->uint32[3] = HTONL(1);
}
/**
* @brief Set *ipv6_addr* to a link-local all routers multicast
* address (ff02::/16 prefix).
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[out] ipv6_addr Is set to a link-local all routers multicast
* address.
*/
static inline void ipv6_addr_set_all_routers_addr(ipv6_addr_t *ipv6_addr)
{
ipv6_addr->uint32[0] = HTONL(0xff020000);
ipv6_addr->uint32[1] = 0;
ipv6_addr->uint32[2] = 0;
ipv6_addr->uint32[3] = HTONL(2);
}
/**
* @brief Set *ipv6_addr* to a link-local all nodes multicast address
* (ff02::/16 prefix).
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[out] ipv6_addr Is set to a link-local all nodes multicast
* address.
*/
static inline void ipv6_addr_set_all_nodes_addr(ipv6_addr_t *ipv6_addr)
{
ipv6_addr->uint32[0] = HTONL(0xff020000);
ipv6_addr->uint32[1] = 0;
ipv6_addr->uint32[2] = 0;
ipv6_addr->uint32[3] = HTONL(1);
}
/**
* @brief Set *ipv6_addr_out* to the solicited-node multicast address
* computed from *ipv6_addr_in*.
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[out] ipv6_addr_out Is set to solicited-node address of
* this node.
* @param[in] ipv6_addr_in The IPv6 address the solicited-node
* address.
*/
static inline void ipv6_addr_set_solicited_node_addr(ipv6_addr_t *ipv6_addr_out,
const ipv6_addr_t *ipv6_addr_in)
{
/* copy only the last 24-bit of the ip-address that is beeing resolved */
ipv6_addr_out->uint32[0] = HTONL(0xff020000);
ipv6_addr_out->uint32[1] = 0;
ipv6_addr_out->uint32[2] = HTONS(1);
ipv6_addr_out->uint8[12] = 0xff;
ipv6_addr_out->uint8[13] = ipv6_addr_in->uint8[13];
ipv6_addr_out->uint16[7] = ipv6_addr_in->uint16[7];
}
/**
* @brief Converts IPv6 address into string.
*
* @param[out] addr_str The IPv6 address as string. Must allocate
* at least IPV6_MAX_ADDR_STR_LEN byte (40
* byte).
* @param[in] str_len The maximum length available to *addr_str*.
* @param[in] ipv6_addr IPv6 address to be converted.
*
* @return Pointer to addr_str.
*/
static inline const char *ipv6_addr_to_str(char *addr_str, uint8_t str_len,
const ipv6_addr_t *ipv6_addr)
{
return inet_ntop(AF_INET6, ipv6_addr, addr_str, (size_t)str_len);
}
/**
* @brief Checks if two IPv6 addresses are equal.
*
* @param[in] a An IPv6 address.
* @param[in] b Another IPv6 address.
*
* @return 1 if *a* and *b* are equal, 0 otherwise.
*/
static inline int ipv6_addr_is_equal(const ipv6_addr_t *a, const ipv6_addr_t *b)
{
return (a->uint32[0] == b->uint32[0]) &&
(a->uint32[1] == b->uint32[1]) &&
(a->uint32[2] == b->uint32[2]) &&
(a->uint32[3] == b->uint32[3]);
}
/**
* @brief Checks if *ipv6_addr* is unspecified (all zero).
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[in] ipv6_addr An IPv6 address.
*
* @return 1 if *ipv6_addr* is unspecified address, 0 otherwise.
*/
static inline int ipv6_addr_is_unspecified(const ipv6_addr_t *ipv6_addr)
{
return (ipv6_addr->uint32[0] == 0) &&
(ipv6_addr->uint32[1] == 0) &&
(ipv6_addr->uint32[2] == 0) &&
(ipv6_addr->uint32[3] == 0);
}
/**
* @brief Check if *ipv6_addr* is a multicast address.
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[in] ipv6_addr An IPv6 address.
*
* @return 1 if *ipv6_addr* is multicast address, 0 otherwise.
*/
static inline int ipv6_addr_is_multicast(const ipv6_addr_t *ipv6_addr)
{
return (ipv6_addr->uint8[0] == 0xff);
}
/**
* @brief Checks if *ipv6_addr* is a loopback address.
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[in] ipv6_addr An IPv6 address.
*
* @return 1 if *ipv6_addr* is loopback address, 0 otherwise.
*/
static inline int ipv6_addr_is_loopback(const ipv6_addr_t *ipv6_addr)
{
return ipv6_addr->uint32[0] == 0 &&
ipv6_addr->uint32[1] == 0 &&
ipv6_addr->uint32[2] == 0 &&
NTOHL(ipv6_addr->uint32[3]) == 1;
}
/**
* @brief Check if *ipv6_addr* is a link-local address.
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[in] ipv6_addr An IPv6 address.
*
* @return 1 if *ipv6_addr* is link-local address, 0 otherwise.
*/
static inline int ipv6_addr_is_link_local(const ipv6_addr_t *ipv6_addr)
{
return ((ipv6_addr->uint32[0] == HTONL(0xfe800000)) &&
(ipv6_addr->uint32[1] == 0)) ||
(ipv6_addr_is_multicast(ipv6_addr) &&
(ipv6_addr->uint8[1] & 0x0f) == 2);
}
/**
* @brief Check if *ipv6_addr* is unique local unicast address.
*
* @see <a href="http://tools.ietf.org/html/rfc4193">
* RFC 4193
* </a>
*
* @param[in] ipv6_addr An IPv6 address.
*
* @return 1 if *ipv6_addr* is unique local unicast address,
* 0 otherwise.
*/
static inline int ipv6_addr_is_unique_local_unicast(const ipv6_addr_t *ipv6_addr)
{
return ((ipv6_addr->uint8[0] == 0xfc) || (ipv6_addr->uint8[0] == 0xfd));
}
/**
* @brief Check if *ipv6_addr* is solicited-node multicast address.
*
* @see <a href="http://tools.ietf.org/html/rfc4291">
* RFC 4291
* </a>
*
* @param[in] ipv6_addr An IPv6 address.
*
* @return 1 if *ipv6_addr* is solicited-node multicast address,
* 0 otherwise.
*/
static inline int ipv6_addr_is_solicited_node(const ipv6_addr_t *ipv6_addr)
{
return (ipv6_addr->uint32[0] == HTONL(0xff020000)) &&
(ipv6_addr->uint32[1] == 0) &&
(ipv6_addr->uint32[2] == HTONL(1)) &&
(ipv6_addr->uint8[12] == 0xff);
}
/**
* @brief Get pointer to potential EUI-64 bit of the IPv6 address.
*
* @param[in] ipv6_addr An IPv6 address of this node.
* @param[in] prefix_len Length of the prefix. Only multiples of 8 are
* possible.
*
* @return The IID (as EUI-64) of this node.
*/
static inline net_if_eui64_t *ipv6_addr_get_iid(const ipv6_addr_t *ipv6_addr,
uint8_t prefix_len)
{
return ((net_if_eui64_t *) &ipv6_addr->uint8[prefix_len / 8]);
}
/*
* TODO to wrap sixlowpan initialisations
* int ipv6_iface_init(transceiver_type_t trans, ..);
*/
/**
* @brief Add an IPv6 address to one of this nodes interfaces.
*
* @see <a href="http://tools.ietf.org/html/rfc4862">
* RFC 4862
* </a>
*
* @param[in] if_id The interface's ID.
* @param[in] addr Address to be added to the interface.
* @param[in] type Type of this address.
* @param[in] state Initial state of the address.
* @param[in] val_ltime Valid lifetime of this address in seconds. Set 0
* for unspecified.
* @param[in] pref_ltime Preferred lifetime of this address in
* seconds. Set 0 for unspecified.
* @param[in] is_anycast Determines if an address is anycast. Anycast
* addresses are syntactically undistinguishable
* from unicast addresses and can only be identified
* with this flag. If *addr* is no unicast address
* and *is_anycast* is set, this function will fail.
*
* @return 1 on success, 0 on failure.
*/
int ipv6_net_if_add_addr(int if_id, const ipv6_addr_t *addr,
ndp_addr_state_t state, uint32_t val_ltime,
uint32_t pref_ltime, uint8_t is_anycast);
/**
* @brief Tries to determine best suitable source address attached to
* an interface of this node based on the given destination
* address. The use-case for this function is to find a
* suitable address for the source address field of an IPv6
* address upon sending. *src* may be empty (all zero) if there
* is no suitable address attached to the interface.
*
* @param[out] src The best source address for this node (may be
* all zero if ther is none).
* @param[in] if_id The interface's ID.
* @param[in] dest The destination address for a packet we search
* the source address for.
*/
void ipv6_net_if_get_best_src_addr(ipv6_addr_t *src, const ipv6_addr_t *dest);
/**
* @brief Registers a function that decides how to route incomming
* IP packets with a destination that is not this interface.
* The default behaviour is to try forwarding such packets to
* the neighborhood.
* Register a function to change the default behaviour.
* Such function shall return the next hop to reach the destination
* of the IP packet, or NULL if no such next hop is known.
* In this case, the packet will be discarded.
*
* @param next_hop function that returns the next hop to reach dest
*/
void ipv6_iface_set_routing_provider(ipv6_addr_t *(*next_hop)(ipv6_addr_t *dest));
/**
* @brief Calculates the IPv6 upper-layer checksum.
*
* @see <a href="http://tools.ietf.org/html/rfc2460#section-8.1">
* RFC 2460, section 8.1
* </a>
* @param[in] ipv6_header Pointer to the IPv6 header of the packet.
* @param[in] buf Pointer to the upper-layer payload of the IP datagram.
* @param[in] len The length of the upper-layer header and data.
* @param[in] proto Upper-layer protocol number according to RFC1700.
*
* @return The IPv6 upper-layer checksum.
*/
uint16_t ipv6_csum(ipv6_hdr_t *ipv6_header, uint8_t *buf, uint16_t len, uint8_t proto);
#endif /* SIXLOWPAN_IP_H */
/** @} */
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