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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,
};
/* array of realms from /etc/iproute2/rt_realms */
static struct xtables_lmap *realms;
static void realm_init(struct xt_entry_match *m)
{
const char file[] = "/etc/iproute2/rt_realms";
realms = xtables_lmap_init(file);
if (realms == NULL && errno != ENOENT)
fprintf(stderr, "Warning: %s: %s\n", file, strerror(errno));
}
static void realm_parse(struct xt_option_call *cb)
{
struct xt_realm_info *realminfo = cb->data;
int id;
char *end;
xtables_option_parse(cb);
realminfo->id = strtoul(cb->arg, &end, 0);
if (end != cb->arg && (*end == '/' || *end == '\0')) {
if (*end == '/')
realminfo->mask = strtoul(end+1, &end, 0);
else
realminfo->mask = 0xffffffff;
if (*end != '\0' || end == cb->arg)
xtables_error(PARAMETER_PROBLEM,
"Bad realm value \"%s\"", cb->arg);
} else {
id = xtables_lmap_name2id(realms, cb->arg);
if (id == -1)
xtables_error(PARAMETER_PROBLEM,
"Realm \"%s\" not found", cb->arg);
realminfo->id = id;
realminfo->mask = 0xffffffff;
}
if (cb->invert)
realminfo->invert = 1;
}
static void
print_realm(unsigned long id, unsigned long mask, int numeric)
{
const char *name = NULL;
if (mask != 0xffffffff)
printf(" 0x%lx/0x%lx", id, mask);
else {
if (numeric == 0)
name = xtables_lmap_id2name(realms, id);
if (name)
printf(" %s", name);
else
printf(" 0x%lx", id);
}
}
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");
print_realm(ri->id, ri->mask, numeric);
}
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");
print_realm(ri->id, ri->mask, 0);
}
static void
print_realm_xlate(unsigned long id, unsigned long mask,
int numeric, struct xt_buf *buf, uint32_t op)
{
const char *name = NULL;
if (mask != 0xffffffff)
xt_buf_add(buf, " and 0x%lx %s 0x%lx ", id,
op == XT_OP_EQ ? "==" : "!=", mask);
else {
if (numeric == 0)
name = xtables_lmap_id2name(realms, id);
if (name)
xt_buf_add(buf, "%s%s ",
op == XT_OP_EQ ? "" : "!= ", name);
else
xt_buf_add(buf, " %s0x%lx ",
op == XT_OP_EQ ? "" : "!= ", id);
}
}
static int realm_xlate(const struct xt_entry_match *match,
struct xt_buf *buf, int numeric)
{
const struct xt_realm_info *ri = (const void *)match->data;
enum xt_op op = XT_OP_EQ;
if (ri->invert)
op = XT_OP_NEQ;
xt_buf_add(buf, "rtclassid");
print_realm_xlate(ri->id, ri->mask, 0, buf, 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,
.init = realm_init,
.print = realm_print,
.save = realm_save,
.x6_parse = realm_parse,
.x6_options = realm_opts,
.xlate = realm_xlate,
};
void _init(void)
{
xtables_register_match(&realm_mt_reg);
}
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