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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#if defined(__GLIBC__) && __GLIBC__ == 2
#include <net/ethernet.h>
#else
#include <linux/if_ether.h>
#endif
#include <xtables.h>
#include <linux/netfilter_ipv4/ipt_realm.h>
enum {
O_REALM = 0,
};
static void realm_help(void)
{
printf(
"realm match options:\n"
"[!] --realm value[/mask]\n"
" Match realm\n");
}
static const struct xt_option_entry realm_opts[] = {
{.name = "realm", .id = O_REALM, .type = XTTYPE_STRING,
.flags = XTOPT_MAND | XTOPT_INVERT},
XTOPT_TABLEEND,
};
static const char f_realms[] = "/etc/iproute2/rt_realms";
/* array of realms from f_realms[] */
static struct xtables_lmap *realms;
static void realm_parse(struct xt_option_call *cb)
{
struct xt_realm_info *ri = cb->data;
unsigned int id, mask;
xtables_option_parse(cb);
xtables_parse_val_mask(cb, &id, &mask, realms);
ri->id = id;
ri->mask = mask;
if (cb->invert)
ri->invert = 1;
}
static void realm_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_realm_info *ri = (const void *)match->data;
if (ri->invert)
printf(" !");
printf(" realm");
xtables_print_val_mask(ri->id, ri->mask, numeric ? NULL : realms);
}
static void realm_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_realm_info *ri = (const void *)match->data;
if (ri->invert)
printf(" !");
printf(" --realm");
xtables_print_val_mask(ri->id, ri->mask, realms);
}
static void
print_realm_xlate(unsigned long id, unsigned long mask,
int numeric, struct xt_xlate *xl, uint32_t op)
{
const char *name = NULL;
if (mask != 0xffffffff)
xt_xlate_add(xl, " and 0x%lx %s 0x%lx", mask,
op == XT_OP_EQ ? "==" : "!=", id);
else {
if (numeric == 0)
name = xtables_lmap_id2name(realms, id);
if (name)
xt_xlate_add(xl, " %s%s",
op == XT_OP_EQ ? "" : "!= ", name);
else
xt_xlate_add(xl, " %s0x%lx",
op == XT_OP_EQ ? "" : "!= ", id);
}
}
static int realm_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_realm_info *ri = (const void *)params->match->data;
enum xt_op op = XT_OP_EQ;
if (ri->invert)
op = XT_OP_NEQ;
xt_xlate_add(xl, "rtclassid");
print_realm_xlate(ri->id, ri->mask, 0, xl, op);
return 1;
}
static struct xtables_match realm_mt_reg = {
.name = "realm",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_realm_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_realm_info)),
.help = realm_help,
.print = realm_print,
.save = realm_save,
.x6_parse = realm_parse,
.x6_options = realm_opts,
.xlate = realm_xlate,
};
void _init(void)
{
realms = xtables_lmap_init(f_realms);
if (realms == NULL && errno != ENOENT)
fprintf(stderr, "Warning: %s: %s\n", f_realms,
strerror(errno));
xtables_register_match(&realm_mt_reg);
}
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