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nes-proj/os/net/ipv6/uip-ds6.h
George Oikonomou 15f6e1d7a3 Change the way of accessing the default v6 prefix 
This commit changes the method of accessing the default v6 prefix. Instead of always using `UIP_DS6_DEFAULT_PREFIX`, we store the default prefix in a variable. We subsequently retrieve the prefix by calling `uip_ds6_default_prefix()`.

`uip_ds6_init()` will set this variable to the value of `UIP_DS6_DEFAULT_PREFIX`, but only if the startup code has not set a different default prefix before `uip_ds6_init()` gets called.

This approach has the following benefits:

* It allows us to change the default prefix at run time.
* It allows the startup code to set a prefix different than the one specified by `UIP_DS6_DEFAULT_PREFIX`, which can be useful if the default prefix comes from a different source (e.g. the command line for native, or a configuration stored on a node's flash)
* In many places the current code assumes that the prefix contains 6 bytes of zeros (e.g. `FDxx::/64`). Changing to a different prefix (e.g. `FD00:ABCD::`) would need extensive code changes. This change here makes it easy to use a prefix of any length.
2018-11-11 18:30:54 +00:00

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/**
* \addtogroup uip
* @{
*/
/**
* \file
* Header file for IPv6-related data structures
* \author Mathilde Durvy <mdurvy@cisco.com>
* \author Julien Abeille <jabeille@cisco.com>
*
*/
/*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*
*/
#ifndef UIP_DS6_H_
#define UIP_DS6_H_
#include "net/ipv6/uip.h"
#include "sys/stimer.h"
/* The size of uip_ds6_addr_t depends on UIP_ND6_DEF_MAXDADNS. Include uip-nd6.h to define it. */
#include "net/ipv6/uip-nd6.h"
#include "net/ipv6/uip-ds6-nbr.h"
#include "net/ipv6/uip-ds6-route.h"
/*--------------------------------------------------*/
/** Configuration. For all tables (Neighbor cache, Prefix List, Routing Table,
* Default Router List, Unicast address list, multicast address list, anycast address list),
* we define:
* - the number of elements requested by the user in contiki configuration (name suffixed by _NBU)
* - the number of elements assigned by the system (name suffixed by _NBS)
* - the total number of elements is the sum (name suffixed by _NB)
* The routing table definitions can be found in uip-ds6-route.h
* The Neighbor cache definitions can be found in nbr-table.h
*/
/* Default router list */
#define UIP_DS6_DEFRT_NBS 0
#ifndef UIP_CONF_DS6_DEFRT_NBU
#define UIP_DS6_DEFRT_NBU 2
#else
#define UIP_DS6_DEFRT_NBU UIP_CONF_DS6_DEFRT_NBU
#endif
#define UIP_DS6_DEFRT_NB UIP_DS6_DEFRT_NBS + UIP_DS6_DEFRT_NBU
/* Default prefix */
#ifdef UIP_CONF_DS6_DEFAULT_PREFIX
#define UIP_DS6_DEFAULT_PREFIX UIP_CONF_DS6_DEFAULT_PREFIX
#else
/* From RFC4193, section 3.1:
* | 7 bits |1| 40 bits | 16 bits | 64 bits |
* +--------+-+------------+-----------+----------------------------+
* | Prefix |L| Global ID | Subnet ID | Interface ID |
* +--------+-+------------+-----------+----------------------------+
* Prefix FC00::/7 prefix to identify Local IPv6 unicast
* addresses.
* L Set to 1 if the prefix is locally assigned.
* Set to 0 may be defined in the future. See
* Section 3.2 for additional information.
* Global ID 40-bit global identifier used to create a
* globally unique prefix. See Section 3.2 for
* additional information.
*
* We set prefix to 0xfc00 and set the local bit, resulting in 0xfd00.
* For high probability of network uniqueness, Global ID must be generated
* pseudo-randomly. As this is a hard-coded default prefix, we simply use
* a Global ID of 0. For real deployments, make sure to install a pseudo-random
* Global ID, e.g. in a RPL network, by configuring it at the root.
*/
#define UIP_DS6_DEFAULT_PREFIX 0xfd00
#endif /* UIP_CONF_DS6_DEFAULT_PREFIX */
#define UIP_DS6_DEFAULT_PREFIX_0 ((UIP_DS6_DEFAULT_PREFIX >> 8) & 0xff)
#define UIP_DS6_DEFAULT_PREFIX_1 (UIP_DS6_DEFAULT_PREFIX & 0xff)
/* Prefix list */
#define UIP_DS6_PREFIX_NBS 1
#ifndef UIP_CONF_DS6_PREFIX_NBU
#define UIP_DS6_PREFIX_NBU 2
#else
#define UIP_DS6_PREFIX_NBU UIP_CONF_DS6_PREFIX_NBU
#endif
#define UIP_DS6_PREFIX_NB UIP_DS6_PREFIX_NBS + UIP_DS6_PREFIX_NBU
/* Unicast address list*/
#define UIP_DS6_ADDR_NBS 1
#ifndef UIP_CONF_DS6_ADDR_NBU
#define UIP_DS6_ADDR_NBU 2
#else
#define UIP_DS6_ADDR_NBU UIP_CONF_DS6_ADDR_NBU
#endif
#define UIP_DS6_ADDR_NB UIP_DS6_ADDR_NBS + UIP_DS6_ADDR_NBU
/* Multicast address list */
#if UIP_CONF_ROUTER
#define UIP_DS6_MADDR_NBS 2 + UIP_DS6_ADDR_NB /* all routers + all nodes + one solicited per unicast */
#else
#define UIP_DS6_MADDR_NBS 1 + UIP_DS6_ADDR_NB /* all nodes + one solicited per unicast */
#endif
#ifndef UIP_CONF_DS6_MADDR_NBU
#define UIP_DS6_MADDR_NBU 0
#else
#define UIP_DS6_MADDR_NBU UIP_CONF_DS6_MADDR_NBU
#endif
#define UIP_DS6_MADDR_NB UIP_DS6_MADDR_NBS + UIP_DS6_MADDR_NBU
/* Anycast address list */
#if UIP_CONF_ROUTER
#define UIP_DS6_AADDR_NBS UIP_DS6_PREFIX_NB - 1 /* One per non link local prefix (subnet prefix anycast address) */
#else
#define UIP_DS6_AADDR_NBS 0
#endif
#ifndef UIP_CONF_DS6_AADDR_NBU
#define UIP_DS6_AADDR_NBU 0
#else
#define UIP_DS6_AADDR_NBU UIP_CONF_DS6_AADDR_NBU
#endif
#define UIP_DS6_AADDR_NB UIP_DS6_AADDR_NBS + UIP_DS6_AADDR_NBU
/*--------------------------------------------------*/
/* Should we use LinkLayer acks in NUD ?*/
#ifndef UIP_CONF_DS6_LL_NUD
#define UIP_DS6_LL_NUD 0
#else
#define UIP_DS6_LL_NUD UIP_CONF_DS6_LL_NUD
#endif
/** \brief Possible states for the an address (RFC 4862) */
#define ADDR_TENTATIVE 0
#define ADDR_PREFERRED 1
#define ADDR_DEPRECATED 2
/** \brief How the address was acquired: Autoconf, DHCP or manually */
#define ADDR_ANYTYPE 0
#define ADDR_AUTOCONF 1
#define ADDR_DHCP 2
#define ADDR_MANUAL 3
/** \brief General DS6 definitions */
/** Period for uip-ds6 periodic task*/
#ifndef UIP_DS6_CONF_PERIOD
#define UIP_DS6_PERIOD (CLOCK_SECOND/10)
#else
#define UIP_DS6_PERIOD UIP_DS6_CONF_PERIOD
#endif
#define FOUND 0
#define FREESPACE 1
#define NOSPACE 2
/*--------------------------------------------------*/
#if UIP_CONF_IPV6_QUEUE_PKT
#include "net/ipv6/uip-packetqueue.h"
#endif /*UIP_CONF_QUEUE_PKT */
/** \brief A prefix list entry */
#if UIP_CONF_ROUTER
typedef struct uip_ds6_prefix {
uint8_t isused;
uip_ipaddr_t ipaddr;
uint8_t length;
uint8_t advertise;
uint32_t vlifetime;
uint32_t plifetime;
uint8_t l_a_reserved; /**< on-link and autonomous flags + 6 reserved bits */
} uip_ds6_prefix_t;
#else /* UIP_CONF_ROUTER */
typedef struct uip_ds6_prefix {
uint8_t isused;
uip_ipaddr_t ipaddr;
uint8_t length;
struct stimer vlifetime;
uint8_t isinfinite;
} uip_ds6_prefix_t;
#endif /*UIP_CONF_ROUTER */
/** * \brief Unicast address structure */
typedef struct uip_ds6_addr {
uint8_t isused;
uip_ipaddr_t ipaddr;
uint8_t state;
uint8_t type;
uint8_t isinfinite;
struct stimer vlifetime;
#if UIP_ND6_DEF_MAXDADNS > 0
struct timer dadtimer;
uint8_t dadnscount;
#endif /* UIP_ND6_DEF_MAXDADNS > 0 */
} uip_ds6_addr_t;
/** \brief Anycast address */
typedef struct uip_ds6_aaddr {
uint8_t isused;
uip_ipaddr_t ipaddr;
} uip_ds6_aaddr_t;
/** \brief A multicast address */
typedef struct uip_ds6_maddr {
uint8_t isused;
uip_ipaddr_t ipaddr;
} uip_ds6_maddr_t;
/** \brief Interface structure (contains all the interface variables) */
typedef struct uip_ds6_netif {
uint32_t link_mtu;
uint8_t cur_hop_limit;
uint32_t base_reachable_time; /* in msec */
uint32_t reachable_time; /* in msec */
uint32_t retrans_timer; /* in msec */
uint8_t maxdadns;
#if UIP_DS6_ADDR_NB
uip_ds6_addr_t addr_list[UIP_DS6_ADDR_NB];
#endif /* UIP_DS6_ADDR_NB */
#if UIP_DS6_AADDR_NB
uip_ds6_aaddr_t aaddr_list[UIP_DS6_AADDR_NB];
#endif /* UIP_DS6_AADDR_NB */
#if UIP_DS6_MADDR_NB
uip_ds6_maddr_t maddr_list[UIP_DS6_MADDR_NB];
#endif /* UIP_DS6_MADDR_NB */
} uip_ds6_netif_t;
/** \brief Generic type for a DS6, to use a common loop though all DS */
typedef struct uip_ds6_element {
uint8_t isused;
uip_ipaddr_t ipaddr;
} uip_ds6_element_t;
/*---------------------------------------------------------------------------*/
extern uip_ds6_netif_t uip_ds6_if;
extern struct etimer uip_ds6_timer_periodic;
#if UIP_CONF_ROUTER
extern uip_ds6_prefix_t uip_ds6_prefix_list[UIP_DS6_PREFIX_NB];
#else /* UIP_CONF_ROUTER */
extern struct etimer uip_ds6_timer_rs;
#endif /* UIP_CONF_ROUTER */
/*---------------------------------------------------------------------------*/
/** \brief Initialize data structures */
void uip_ds6_init(void);
/** \brief Periodic processing of data structures */
void uip_ds6_periodic(void);
/** \brief Generic loop routine on an abstract data structure, which generalizes
* all data structures used in DS6 */
uint8_t uip_ds6_list_loop(uip_ds6_element_t *list, uint8_t size,
uint16_t elementsize, uip_ipaddr_t *ipaddr,
uint8_t ipaddrlen,
uip_ds6_element_t **out_element);
/** @} */
/** \name Prefix list basic routines */
/** @{ */
#if UIP_CONF_ROUTER
uip_ds6_prefix_t *uip_ds6_prefix_add(uip_ipaddr_t *ipaddr, uint8_t length,
uint8_t advertise, uint8_t flags,
unsigned long vtime,
unsigned long ptime);
#else /* UIP_CONF_ROUTER */
uip_ds6_prefix_t *uip_ds6_prefix_add(uip_ipaddr_t *ipaddr, uint8_t length,
unsigned long interval);
#endif /* UIP_CONF_ROUTER */
void uip_ds6_prefix_rm(uip_ds6_prefix_t *prefix);
uip_ds6_prefix_t *uip_ds6_prefix_lookup(uip_ipaddr_t *ipaddr,
uint8_t ipaddrlen);
uint8_t uip_ds6_is_addr_onlink(uip_ipaddr_t *ipaddr);
/**
* \brief Retrieve the Default IPv6 prefix
* \retval A pointer to the default prefix
*/
const uip_ip6addr_t *uip_ds6_default_prefix(void);
/**
* \brief Set the Default IPv6 prefix
* \param prefix A pointer to the new default prefix
*
* uip_ds6_init() will set the default prefix to UIP_DS6_DEFAULT_PREFIX
* unless this function here has been called beforehand to set a new default
* prefix.
*/
void uip_ds6_set_default_prefix(const uip_ip6addr_t *prefix);
/** @} */
/** \name Unicast address list basic routines */
/** @{ */
/** \brief Add a unicast address to the interface */
uip_ds6_addr_t *uip_ds6_addr_add(uip_ipaddr_t *ipaddr,
unsigned long vlifetime, uint8_t type);
void uip_ds6_addr_rm(uip_ds6_addr_t *addr);
uip_ds6_addr_t *uip_ds6_addr_lookup(uip_ipaddr_t *ipaddr);
uip_ds6_addr_t *uip_ds6_get_link_local(int8_t state);
uip_ds6_addr_t *uip_ds6_get_global(int8_t state);
/** @} */
/** \name Multicast address list basic routines */
/** @{ */
uip_ds6_maddr_t *uip_ds6_maddr_add(const uip_ipaddr_t *ipaddr);
void uip_ds6_maddr_rm(uip_ds6_maddr_t *maddr);
uip_ds6_maddr_t *uip_ds6_maddr_lookup(const uip_ipaddr_t *ipaddr);
/** @} */
/** \name Anycast address list basic routines */
/** @{ */
uip_ds6_aaddr_t *uip_ds6_aaddr_add(uip_ipaddr_t *ipaddr);
void uip_ds6_aaddr_rm(uip_ds6_aaddr_t *aaddr);
uip_ds6_aaddr_t *uip_ds6_aaddr_lookup(uip_ipaddr_t *ipaddr);
/** @} */
/** \brief set the last 64 bits of an IP address based on the MAC address */
void uip_ds6_set_addr_iid(uip_ipaddr_t *ipaddr, uip_lladdr_t *lladdr);
/** \brief Build a link-layer address from an IPv6 address based on its UUID64 */
void uip_ds6_set_lladdr_from_iid(uip_lladdr_t *lladdr, const uip_ipaddr_t *ipaddr);
/** \brief Get the number of matching bits of two addresses */
uint8_t get_match_length(uip_ipaddr_t *src, uip_ipaddr_t *dst);
#if UIP_ND6_DEF_MAXDADNS >0
/** \brief Perform Duplicate Address Selection on one address */
void uip_ds6_dad(uip_ds6_addr_t *ifaddr);
/** \brief Callback when DAD failed */
int uip_ds6_dad_failed(uip_ds6_addr_t *ifaddr);
#endif /* UIP_ND6_DEF_MAXDADNS */
/** \brief Source address selection, see RFC 3484 */
void uip_ds6_select_src(uip_ipaddr_t *src, uip_ipaddr_t *dst);
#if UIP_CONF_ROUTER
#if UIP_ND6_SEND_RA
/** \brief Send a RA as an asnwer to a RS */
void uip_ds6_send_ra_sollicited(void);
/** \brief Send a periodic RA */
void uip_ds6_send_ra_periodic(void);
#endif /* UIP_ND6_SEND_RA */
#else /* UIP_CONF_ROUTER */
/** \brief Send periodic RS to find router */
void uip_ds6_send_rs(void);
#endif /* UIP_CONF_ROUTER */
/** \brief Compute the reachable time based on base reachable time, see RFC 4861*/
uint32_t uip_ds6_compute_reachable_time(void); /** \brief compute random reachable timer */
/** \name Macros to check if an IP address (unicast, multicast or anycast) is mine */
/** @{ */
#define uip_ds6_is_my_addr(addr) (uip_ds6_addr_lookup(addr) != NULL)
#define uip_ds6_is_my_maddr(addr) (uip_ds6_maddr_lookup(addr) != NULL)
#define uip_ds6_is_my_aaddr(addr) (uip_ds6_aaddr_lookup(addr) != NULL)
/** @} */
/** @} */
#endif /* UIP_DS6_H_ */
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