sc_gnrc_6ctx.c
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/*
* Copyright (C) 2015 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.
*/
/**
* @{
*
* @file
*/
/* Required for strtok_r in string.h, when building with -std=c99 */
#define _DEFAULT_SOURCE 1
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "net/ipv6/addr.h"
#include "net/gnrc/ipv6/netif.h"
#include "net/gnrc/ndp/internal.h"
#include "net/gnrc/sixlowpan/ctx.h"
#include "net/gnrc/sixlowpan/nd.h"
#include "timex.h"
#include "xtimer.h"
static xtimer_t del_timer[GNRC_SIXLOWPAN_CTX_SIZE];
static gnrc_sixlowpan_nd_router_abr_t *abr = NULL;
void _del_cb(void *ptr)
{
gnrc_sixlowpan_ctx_t *ctx = ptr;
uint8_t cid = ctx->flags_id & GNRC_SIXLOWPAN_CTX_FLAGS_CID_MASK;
ctx->prefix_len = 0;
gnrc_sixlowpan_nd_router_abr_rem_ctx(abr, cid);
del_timer[cid].callback = NULL;
}
static void _usage(char *cmd_str)
{
printf("usage: %s [{add <0-15> <prefix>/<prefix_len> <ltime in min>|del <ctx>}]\n", cmd_str);
puts(" `del` will only invalidate the context for compression. It can be");
puts(" reassigned after 5 min.");
}
int _gnrc_6ctx_list(void)
{
puts("cid|prefix |C|ltime");
puts("-----------------------------------------------------------");
for (uint8_t i = 0; i < GNRC_SIXLOWPAN_CTX_SIZE; i++) {
gnrc_sixlowpan_ctx_t *ctx = gnrc_sixlowpan_ctx_lookup_id(i);
if (ctx != NULL) {
char addr_str[IPV6_ADDR_MAX_STR_LEN];
printf(" %2" PRIu8 "|%39s/%-3" PRIu8 "|%" PRIx8 "|%5" PRIu16 " min\n", i,
ipv6_addr_to_str(addr_str, &ctx->prefix, sizeof(addr_str)), ctx->prefix_len,
(uint8_t) ((ctx->flags_id & 0xf0) >> 4), ctx->ltime);
}
}
return 0;
}
static void _adv_ctx(void)
{
kernel_pid_t ifs[GNRC_NETIF_NUMOF];
size_t ifnum = gnrc_netif_get(ifs);
for (size_t i = 0; i < ifnum; i++) {
gnrc_ipv6_netif_t *iface = gnrc_ipv6_netif_get(ifs[i]);
if ((iface != NULL) && (iface->flags & GNRC_IPV6_NETIF_FLAGS_SIXLOWPAN)) {
gnrc_ndp_internal_send_rtr_adv(ifs[i], NULL, NULL, false);
}
}
}
int _gnrc_6ctx_add(char *cmd_str, char *ctx_str, char *prefix_str, char *ltime_str)
{
ipv6_addr_t prefix;
char *addr_str, *prefix_len_str, *save_ptr;
unsigned prefix_len;
unsigned ltime;
unsigned ctx = (unsigned)atoi(ctx_str);
if (ctx >= GNRC_SIXLOWPAN_CTX_SIZE) {
_usage(cmd_str);
return 1;
}
addr_str = strtok_r(prefix_str, "/", &save_ptr);
if (addr_str == NULL) {
_usage(cmd_str);
return 1;
}
prefix_len_str = strtok_r(NULL, "/", &save_ptr);
if (addr_str == NULL) {
_usage(cmd_str);
return 1;
}
prefix_len = (unsigned)atoi(prefix_len_str);
if ((prefix_len - 1U) > 128U) {
puts("ERROR: prefix_len < 1 || prefix_len > 128");
return 1;
}
ipv6_addr_from_str(&prefix, addr_str);
if (ipv6_addr_is_unspecified(&prefix)) {
puts("ERROR: prefix may not be ::");
return 1;
}
if (abr == NULL) {
abr = gnrc_sixlowpan_nd_router_abr_get();
}
if (gnrc_sixlowpan_nd_router_abr_add_ctx(abr, ctx) < 0) {
puts("ERROR: can not add context");
return 1;
}
ltime = (unsigned)atoi(ltime_str);
if (gnrc_sixlowpan_ctx_update((uint8_t)ctx, &prefix, (uint8_t)prefix_len, ltime,
true) == NULL) {
puts("ERROR: can not add context");
return 1;
}
/* advertise new/updated context */
_adv_ctx();
return 0;
}
int _gnrc_6ctx_del(char *cmd_str, char *ctx_str)
{
gnrc_sixlowpan_ctx_t *ctx;
unsigned cid = (unsigned)atoi(ctx_str);
if (cid >= GNRC_SIXLOWPAN_CTX_SIZE) {
_usage(cmd_str);
return 1;
}
else if (del_timer[cid].callback == NULL) {
ctx = gnrc_sixlowpan_ctx_lookup_id(cid);
if (ctx != NULL) {
ctx->flags_id &= ~GNRC_SIXLOWPAN_CTX_FLAGS_COMP;
ctx->ltime = 0;
del_timer[cid].callback = _del_cb;
del_timer[cid].arg = ctx;
xtimer_set(&del_timer[cid], GNRC_SIXLOWPAN_ND_RTR_MIN_CTX_DELAY * SEC_IN_USEC);
}
}
else {
printf("Context %u already marked for removal\n", cid);
return 1;
}
/* advertise updated context */
_adv_ctx();
return 0;
}
int _gnrc_6ctx(int argc, char **argv)
{
if (argc < 2) {
_gnrc_6ctx_list();
}
else if (strcmp("add", argv[1]) == 0) {
if (argc < 5) {
_usage(argv[0]);
return 1;
}
return _gnrc_6ctx_add(argv[0], argv[2], argv[3], argv[4]);
}
else if (strcmp("del", argv[1]) == 0) {
return _gnrc_6ctx_del(argv[0], argv[2]);
}
else {
_usage(argv[0]);
return 1;
}
return 0;
}
/** @} */