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nes-proj/core/net/uip-netif.c

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/**
* \addtogroup uip6
* @{
*/
/**
* \file
* Network interface and stateless autoconfiguration (RFC 4862)
* \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.
*
*
*/
#include "net/uip-nd6.h"
#include "net/uip-netif.h"
#include "lib/random.h"
#include <string.h>
#include <stdlib.h>
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINT6ADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])
#define PRINTLLADDR(lladdr) PRINTF(" %02x:%02x:%02x:%02x:%02x:%02x ",lladdr->addr[0], lladdr->addr[1], lladdr->addr[2], lladdr->addr[3],lladdr->addr[4], lladdr->addr[5])
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#define PRINTLLADDR(lladdr)
#endif
#if UIP_LOGGING
#include <stdio.h>
void uip_log(char *msg);
#define UIP_LOG(m) uip_log(m)
#else
#define UIP_LOG(m)
#endif /* UIP_LOGGING == 1 */
/*---------------------------------------------------------------------------*/
/** \brief The single physical interface */
struct uip_netif uip_netif_physical_if;
/** \brief DAD timer */
struct etimer uip_netif_timer_dad;
/** \brief The interface address on which dad is being performed */
static struct uip_netif_addr *dad_ifaddr;
/** \brief Number of ns already sent for DAD*/
static u8_t dad_ns;
/** \brief RS timer, to schedule RS sending */
struct etimer uip_netif_timer_rs;
/** \brief number of rs already sent */
static u8_t rs_count;
/** \brief index for loops */
static u8_t i;
/** \brief timer to check the address states */
struct etimer uip_netif_timer_periodic;
/** \brief remove an interface address, argument type is uip_netif_addr* */
#define uip_netif_addr_rm(addr) do { \
PRINTF("Removing address"); \
PRINT6ADDR(&addr->ipaddr); \
PRINTF("\n"); \
addr->state = NOT_USED; \
} while(0)
/*---------------------------------------------------------------------------*/
void
uip_netif_init(void)
{
/* INITIALIZE INTERFACE (default values for now) */
uip_netif_physical_if.link_mtu = UIP_LINK_MTU;
uip_netif_physical_if.cur_hop_limit = UIP_TTL;
uip_netif_physical_if.base_reachable_time = UIP_ND6_REACHABLE_TIME;
uip_netif_physical_if.reachable_time = uip_netif_compute_reachable_time();
uip_netif_physical_if.retrans_timer = UIP_ND6_RETRANS_TIMER;
uip_netif_physical_if.dup_addr_detect_transmit = 1;
/*
* STATELESS AUTOCONFIGURATION of the link local address. We set it to
* infinite (this will become really true once DAD succeeds)
*/
uip_ip6addr(&(uip_netif_physical_if.addresses[0].ipaddr),
0xfe80,0,0,0,0,0,0,0);
uip_netif_addr_autoconf_set(&(uip_netif_physical_if.addresses[0].ipaddr), &uip_lladdr);
uip_netif_physical_if.addresses[0].state = TENTATIVE;
uip_netif_physical_if.addresses[0].type = MANUAL;
uip_netif_physical_if.addresses[0].is_infinite = 1;
/* set all other addresses to NOT_USED initialy */
for(i = 1; i < UIP_CONF_NETIF_MAX_ADDRESSES; i ++)
uip_netif_physical_if.addresses[i].state = NOT_USED;
uip_ip6addr_u8(&(uip_netif_physical_if.solicited_node_mcastaddr),
0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01, 0xff,
uip_lladdr.addr[UIP_LLADDR_LEN - 3],
uip_lladdr.addr[UIP_LLADDR_LEN - 2],
uip_lladdr.addr[UIP_LLADDR_LEN - 1]);
/* Start DAD */
uip_netif_sched_dad(&(uip_netif_physical_if.addresses[0]));
/* Find router (send rs to all-routers multicast group)) */
uip_netif_sched_send_rs();
/* Reset the timer */
etimer_set(&uip_netif_timer_periodic, CLOCK_SECOND);
}
/*---------------------------------------------------------------------------*/
void
uip_netif_periodic(void) {
for(i = 1; i < UIP_CONF_NETIF_MAX_ADDRESSES; i++) {
if((uip_netif_physical_if.addresses[i].state != NOT_USED) &&
(uip_netif_physical_if.addresses[i].is_infinite != 1) &&
(stimer_expired(&uip_netif_physical_if.addresses[i].vlifetime))) {
uip_netif_addr_rm((&uip_netif_physical_if.addresses[i]));
}
}
etimer_reset(&uip_netif_timer_periodic);
return;
}
/*---------------------------------------------------------------------------*/
u32_t
uip_netif_compute_reachable_time(void)
{
return (u32_t)(uip_netif_physical_if.base_reachable_time * UIP_ND6_MIN_RANDOM_FACTOR) + ((u16_t)(random_rand() << 8) + (u16_t)random_rand()) % (u32_t)(uip_netif_physical_if.base_reachable_time *(UIP_ND6_MAX_RANDOM_FACTOR - UIP_ND6_MIN_RANDOM_FACTOR));
}
/*---------------------------------------------------------------------------*/
u8_t
uip_netif_is_addr_my_solicited(uip_ipaddr_t *ipaddr)
{
if(uip_ipaddr_cmp(ipaddr, &uip_netif_physical_if.solicited_node_mcastaddr))
return 1;
return 0;
}
/*---------------------------------------------------------------------------*/
struct uip_netif_addr *
uip_netif_addr_lookup(uip_ipaddr_t *ipaddr, u8_t length, uip_netif_type type) {
for(i = 0; i < UIP_CONF_NETIF_MAX_ADDRESSES; i ++) {
if((uip_netif_physical_if.addresses[i].state != NOT_USED) &&
(uip_netif_physical_if.addresses[i].type == type || type == 0) &&
(uip_ipaddr_prefixcmp(&(uip_netif_physical_if.addresses[i].ipaddr), ipaddr, length))) {
return &uip_netif_physical_if.addresses[i];
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
void
uip_netif_addr_add(uip_ipaddr_t *ipaddr, u8_t length, unsigned long vlifetime, uip_netif_type type) {
/* check prefix has the right length if we are doing autoconf */
if((type == AUTOCONF) && (length != UIP_DEFAULT_PREFIX_LEN)) {
UIP_LOG("Error: UNSUPPORTED PREFIX LENGTH");
return;
}
/* check if addr does not already exist and find a free entry */
for(i = 0; i < UIP_CONF_NETIF_MAX_ADDRESSES; ++i) {
if(uip_netif_physical_if.addresses[i].state == NOT_USED){
/*
* Copying address
* If we are doing autoconf, ipaddr is a prefix, we copy the 128 bits
* of it, then overwrite the last 64 bits with the interface ID at
* next if statement.
* Otherwise ipaddr is an address, we just copy it
*/
uip_ipaddr_copy(&uip_netif_physical_if.addresses[i].ipaddr, ipaddr);
if(type == AUTOCONF) {
/* construct address from prefix and layer2 id */
uip_netif_addr_autoconf_set(&uip_netif_physical_if.addresses[i].ipaddr, &uip_lladdr);
}
/* setting state, type */
uip_netif_physical_if.addresses[i].state = TENTATIVE;
uip_netif_physical_if.addresses[i].type = type;
/* setting lifetime timer if lieftime is not infinite */
if(vlifetime != 0) {
stimer_set(&(uip_netif_physical_if.addresses[i].vlifetime), vlifetime);
uip_netif_physical_if.addresses[i].is_infinite = 0;
} else {
uip_netif_physical_if.addresses[i].is_infinite = 1;
}
PRINTF("Created new address");
PRINT6ADDR(&uip_netif_physical_if.addresses[i].ipaddr);
PRINTF("for interface\n");
/* schedule DAD */
uip_netif_sched_dad(&uip_netif_physical_if.addresses[i]);
return;
}
}
/* If we did not find space, log */
UIP_LOG("ADDRESS LIST FULL");
return;
}
/*---------------------------------------------------------------------------*/
void
uip_netif_addr_autoconf_set(uip_ipaddr_t *ipaddr, uip_lladdr_t *lladdr)
{
/* We consider only links with IEEE EUI-64 identifier or
IEEE 48-bit MAC addresses */
#if (UIP_LLADDR_LEN == 8)
memcpy(ipaddr->u8 + 8, lladdr, UIP_LLADDR_LEN);
ipaddr->u8[8] ^= 0x02;
#elif (UIP_LLADDR_LEN == 6)
memcpy(ipaddr->u8 + 8, lladdr, 3);
ipaddr->u8[11] = 0xff;
ipaddr->u8[12] = 0xfe;
memcpy(ipaddr->u8 + 13, (u8_t*)lladdr + 3, 3);
ipaddr->u8[8] ^= 0x02;
#else
UIP_LOG("CAN NOT BUIL INTERFACE IDENTIFIER");
UIP_LOG("THE STACK IS GOING TO SHUT DOWN");
UIP_LOG("THE HOST WILL BE UNREACHABLE");
exit(-1);
#endif
}
/*---------------------------------------------------------------------------*/
u8_t
get_match_length(uip_ipaddr_t *src, uip_ipaddr_t *dst)
{
u8_t j, k, x_or;
u8_t len = 0;
for(j = 0; j < 16; j ++) {
if(src->u8[j] == dst->u8[j]) {
len += 8;
} else {
x_or = src->u8[j] ^ dst->u8[j];
for(k = 0; k < 8; k ++) {
if((x_or & 0x80) == 0){
len ++;
x_or <<= 1;
}
else {
break;
}
}
break;
}
}
return len;
}
/*---------------------------------------------------------------------------*/
void
uip_netif_select_src(uip_ipaddr_t *src, uip_ipaddr_t *dst)
{
u8_t best = 0; /* number of bit in common with best match*/
u8_t n = 0;
u8_t index = 0;
if(!uip_is_addr_link_local(dst) && !uip_is_addr_mcast(dst)) {
for(i = 1; i < UIP_CONF_NETIF_MAX_ADDRESSES; ++i) {
if(uip_netif_physical_if.addresses[i].state == PREFERRED){
n = get_match_length(dst, &(uip_netif_physical_if.addresses[i].ipaddr));
if(n >= best){
best = n;
index = i;
}
}
}
}
uip_ipaddr_copy(src, &(uip_netif_physical_if.addresses[index].ipaddr));
return;
}
/*---------------------------------------------------------------------------*/
void
uip_netif_sched_dad(struct uip_netif_addr *ifaddr)
{
if(ifaddr->state != TENTATIVE){
UIP_LOG("DAD called with non tentative address");
return;
}
/*
* check dad is not running
*/
if(dad_ifaddr != NULL){
UIP_LOG("DAD already running");
return;
}
/*
* Set the interface address that is going through DAD
*/
dad_ifaddr = ifaddr;
PRINTF("Scheduling DAD for ipaddr:");
PRINT6ADDR(&dad_ifaddr->ipaddr);
PRINTF("\n");
etimer_set(&uip_netif_timer_dad, random_rand()%(UIP_ND6_MAX_RTR_SOLICITATION_DELAY * CLOCK_SECOND));
}
/*---------------------------------------------------------------------------*/
void
uip_netif_dad(void)
{
/*
* check if dad is running
*/
if(dad_ifaddr == NULL){
PRINTF("uip_netif_dad: DAD not running\n");
return;
}
/*
* send dup_addr_detect_transmit NS for DAD
*/
if(dad_ns < uip_netif_physical_if.dup_addr_detect_transmit) {
uip_nd6_io_ns_output(NULL, NULL, &dad_ifaddr->ipaddr);
dad_ns++;
etimer_set(&uip_netif_timer_dad, uip_netif_physical_if.retrans_timer / 1000 * CLOCK_SECOND);
return;
}
/*
* If we arrive here it means DAD succeeded, otherwise the dad process
* would have been interrupted in nd6_dad_ns/na_input
*/
PRINTF("DAD succeeded for ipaddr:");
PRINT6ADDR(&(dad_ifaddr->ipaddr));
PRINTF("\n");
etimer_stop(&uip_netif_timer_dad);
dad_ifaddr->state = PREFERRED;
dad_ifaddr = NULL;
dad_ns = 0;
/*
* check if we need to run DAD on another address
* This is necessary because if you receive a RA,
* you might want to run DAD for several addresses
* Considering that we have structures to do DAD
* for one address only, we start DAD for the subsequent
* addresses here
*/
PRINTF("END of DAD\n");
for(i = 0; i < UIP_CONF_NETIF_MAX_ADDRESSES; i ++){
if(uip_netif_physical_if.addresses[i].state != NOT_USED){
PRINTF("address %u : ",i);
PRINT6ADDR(&(uip_netif_physical_if.addresses[i].ipaddr));
PRINTF("\n");
}
if(uip_netif_physical_if.addresses[i].state == TENTATIVE){
uip_netif_sched_dad(&uip_netif_physical_if.addresses[i]);
return;
}
}
}
/*---------------------------------------------------------------------------*/
void
uip_netif_dad_failed(uip_ipaddr_t *ipaddr)
{
UIP_LOG("DAD FAILED");
UIP_LOG("THE STACK IS GOING TO SHUT DOWN");
UIP_LOG("THE HOST WILL BE UNREACHABLE");
if(uip_ipaddr_cmp(&dad_ifaddr->ipaddr, ipaddr)){
etimer_stop(&uip_netif_timer_dad);
dad_ifaddr->state = NOT_USED;
dad_ifaddr = NULL;
dad_ns = 0;
}
exit(-1);
}
/*---------------------------------------------------------------------------*/
void
uip_netif_sched_send_rs(void)
{
/* before a host sends an initial solicitation, it SHOULD delay the
transmission for a random amount of time between 0 and
UIP_ND6_MAX_RTR_SOLICITATION_DELAY. */
if(rs_count == 0){
etimer_set(&uip_netif_timer_rs, random_rand()%(UIP_ND6_MAX_RTR_SOLICITATION_DELAY * CLOCK_SECOND));
PRINTF("Scheduling RS\n");
}
}
/*---------------------------------------------------------------------------*/
void
uip_netif_send_rs(void)
{
if((uip_nd6_choose_defrouter() == NULL) && (rs_count < UIP_ND6_MAX_RTR_SOLICITATIONS)){
PRINTF("Sending RS %u\n", rs_count);
uip_nd6_io_rs_output();
rs_count++;
etimer_set(&uip_netif_timer_rs, UIP_ND6_RTR_SOLICITATION_INTERVAL * CLOCK_SECOND);
} else {
PRINTF("Router found ? (boolean): %u\n", (uip_nd6_choose_defrouter() != NULL));
etimer_stop(&uip_netif_timer_rs);
rs_count = 0;
}
}
/** @} */
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