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/* Shared library add-on to ip6tables to add mobility header support. */
/*
* Copyright (C)2006 USAGI/WIDE Project
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Author:
* Masahide NAKAMURA @USAGI <masahide.nakamura.cz@hitachi.com>
*
* Based on libip6t_{icmpv6,udp}.c
*/
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_mh.h>
struct mh_name {
const char *name;
u_int8_t type;
};
static const struct mh_name mh_names[] = {
{ "binding-refresh-request", 0, },
/* Alias */ { "brr", 0, },
{ "home-test-init", 1, },
/* Alias */ { "hoti", 1, },
{ "careof-test-init", 2, },
/* Alias */ { "coti", 2, },
{ "home-test", 3, },
/* Alias */ { "hot", 3, },
{ "careof-test", 4, },
/* Alias */ { "cot", 4, },
{ "binding-update", 5, },
/* Alias */ { "bu", 5, },
{ "binding-acknowledgement", 6, },
/* Alias */ { "ba", 6, },
{ "binding-error", 7, },
/* Alias */ { "be", 7, },
};
static void print_types_all(void)
{
unsigned int i;
printf("Valid MH types:");
for (i = 0; i < sizeof(mh_names)/sizeof(struct mh_name); i++) {
if (i && mh_names[i].type == mh_names[i-1].type)
printf(" (%s)", mh_names[i].name);
else
printf("\n%s", mh_names[i].name);
}
printf("\n");
}
static void mh_help(void)
{
printf(
"mh match options:\n"
"[!] --mh-type type[:type] match mh type\n");
print_types_all();
}
static void mh_init(struct xt_entry_match *m)
{
struct ip6t_mh *mhinfo = (struct ip6t_mh *)m->data;
mhinfo->types[1] = 0xFF;
}
static unsigned int name_to_type(const char *name)
{
int namelen = strlen(name);
unsigned int limit = sizeof(mh_names)/sizeof(struct mh_name);
unsigned int match = limit;
unsigned int i;
for (i = 0; i < limit; i++) {
if (strncasecmp(mh_names[i].name, name, namelen) == 0) {
int len = strlen(mh_names[i].name);
if (match == limit || len == namelen)
match = i;
}
}
if (match != limit) {
return mh_names[match].type;
} else {
unsigned int number;
if (!xtables_strtoui(name, NULL, &number, 0, UINT8_MAX))
exit_error(PARAMETER_PROBLEM,
"Invalid MH type `%s'\n", name);
return number;
}
}
static void parse_mh_types(const char *mhtype, u_int8_t *types)
{
char *buffer;
char *cp;
buffer = strdup(mhtype);
if ((cp = strchr(buffer, ':')) == NULL)
types[0] = types[1] = name_to_type(buffer);
else {
*cp = '\0';
cp++;
types[0] = buffer[0] ? name_to_type(buffer) : 0;
types[1] = cp[0] ? name_to_type(cp) : 0xFF;
if (types[0] > types[1])
exit_error(PARAMETER_PROBLEM,
"Invalid MH type range (min > max)");
}
free(buffer);
}
#define MH_TYPES 0x01
static int mh_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct ip6t_mh *mhinfo = (struct ip6t_mh *)(*match)->data;
switch (c) {
case '1':
if (*flags & MH_TYPES)
exit_error(PARAMETER_PROBLEM,
"Only one `--mh-type' allowed");
check_inverse(optarg, &invert, &optind, 0);
parse_mh_types(argv[optind-1], mhinfo->types);
if (invert)
mhinfo->invflags |= IP6T_MH_INV_TYPE;
*flags |= MH_TYPES;
break;
default:
return 0;
}
return 1;
}
static const char *type_to_name(u_int8_t type)
{
unsigned int i;
for (i = 0; i < sizeof(mh_names)/sizeof(struct mh_name); i++) {
if (mh_names[i].type == type)
return mh_names[i].name;
}
return NULL;
}
static void print_type(u_int8_t type, int numeric)
{
const char *name;
if (numeric || !(name = type_to_name(type)))
printf("%u", type);
else
printf("%s", name);
}
static void print_types(u_int8_t min, u_int8_t max, int invert, int numeric)
{
const char *inv = invert ? "!" : "";
if (min != 0 || max != 0xFF || invert) {
if (min == max) {
printf("%s", inv);
print_type(min, numeric);
} else {
printf("%s", inv);
print_type(min, numeric);
printf(":");
print_type(max, numeric);
}
printf(" ");
}
}
static void mh_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ip6t_mh *mhinfo = (struct ip6t_mh *)match->data;
printf("mh ");
print_types(mhinfo->types[0], mhinfo->types[1],
mhinfo->invflags & IP6T_MH_INV_TYPE,
numeric);
if (mhinfo->invflags & ~IP6T_MH_INV_MASK)
printf("Unknown invflags: 0x%X ",
mhinfo->invflags & ~IP6T_MH_INV_MASK);
}
static void mh_save(const void *ip, const struct xt_entry_match *match)
{
const struct ip6t_mh *mhinfo = (struct ip6t_mh *)match->data;
if (mhinfo->types[0] == 0 && mhinfo->types[1] == 0xFF)
return;
if (mhinfo->invflags & IP6T_MH_INV_TYPE)
printf("! ");
if (mhinfo->types[0] != mhinfo->types[1])
printf("--mh-type %u:%u ", mhinfo->types[0], mhinfo->types[1]);
else
printf("--mh-type %u ", mhinfo->types[0]);
}
static const struct option mh_opts[] = {
{ "mh-type", 1, NULL, '1' },
{ .name = NULL }
};
static struct xtables_match mh_mt6_reg = {
.name = "mh",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct ip6t_mh)),
.userspacesize = XT_ALIGN(sizeof(struct ip6t_mh)),
.help = mh_help,
.init = mh_init,
.parse = mh_parse,
.print = mh_print,
.save = mh_save,
.extra_opts = mh_opts,
};
void _init(void)
{
xtables_register_match(&mh_mt6_reg);
}
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