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/* Shared library add-on to iptables to add devgroup matching support.
*
* Copyright (c) 2011 Patrick McHardy <kaber@trash.net>
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <xtables.h>
#include <linux/netfilter/xt_devgroup.h>
static void devgroup_help(void)
{
printf(
"devgroup match options:\n"
"[!] --src-group value[/mask] Match device group of incoming device\n"
"[!] --dst-group value[/mask] Match device group of outgoing device\n"
);
}
enum {
O_SRC_GROUP = 0,
O_DST_GROUP,
};
static const struct xt_option_entry devgroup_opts[] = {
{.name = "src-group", .id = O_SRC_GROUP, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
{.name = "dst-group", .id = O_DST_GROUP, .type = XTTYPE_STRING,
.flags = XTOPT_INVERT},
XTOPT_TABLEEND,
};
static const char f_devgroups[] = "/etc/iproute2/group";
/* array of devgroups from f_devgroups[] */
static struct xtables_lmap *devgroups;
static void devgroup_parse(struct xt_option_call *cb)
{
struct xt_devgroup_info *info = cb->data;
unsigned int group, mask;
xtables_option_parse(cb);
xtables_parse_val_mask(cb, &group, &mask, devgroups);
switch (cb->entry->id) {
case O_SRC_GROUP:
info->src_group = group;
info->src_mask = mask;
info->flags |= XT_DEVGROUP_MATCH_SRC;
if (cb->invert)
info->flags |= XT_DEVGROUP_INVERT_SRC;
break;
case O_DST_GROUP:
info->dst_group = group;
info->dst_mask = mask;
info->flags |= XT_DEVGROUP_MATCH_DST;
if (cb->invert)
info->flags |= XT_DEVGROUP_INVERT_DST;
break;
}
}
static void devgroup_show(const char *pfx, const struct xt_devgroup_info *info,
int numeric)
{
if (info->flags & XT_DEVGROUP_MATCH_SRC) {
if (info->flags & XT_DEVGROUP_INVERT_SRC)
printf(" !");
printf(" %ssrc-group", pfx);
xtables_print_val_mask(info->src_group, info->src_mask,
numeric ? NULL : devgroups);
}
if (info->flags & XT_DEVGROUP_MATCH_DST) {
if (info->flags & XT_DEVGROUP_INVERT_DST)
printf(" !");
printf(" %sdst-group", pfx);
xtables_print_val_mask(info->dst_group, info->dst_mask,
numeric ? NULL : devgroups);
}
}
static void devgroup_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct xt_devgroup_info *info = (const void *)match->data;
devgroup_show("", info, numeric);
}
static void devgroup_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_devgroup_info *info = (const void *)match->data;
devgroup_show("--", info, 0);
}
static void devgroup_check(struct xt_fcheck_call *cb)
{
if (cb->xflags == 0)
xtables_error(PARAMETER_PROBLEM,
"devgroup match: You must specify either "
"'--src-group' or '--dst-group'");
}
static void
print_devgroup_xlate(unsigned int id, uint32_t op, unsigned int mask,
struct xt_xlate *xl, int numeric)
{
const char *name = NULL;
if (mask != 0xffffffff)
xt_xlate_add(xl, "and 0x%x %s 0x%x", mask,
op == XT_OP_EQ ? "==" : "!=", id);
else {
if (numeric == 0)
name = xtables_lmap_id2name(devgroups, id);
xt_xlate_add(xl, "%s", op == XT_OP_EQ ? "" : "!= ");
if (name)
xt_xlate_add(xl, "%s", name);
else
xt_xlate_add(xl, "0x%x", id);
}
}
static void devgroup_show_xlate(const struct xt_devgroup_info *info,
struct xt_xlate *xl, int numeric)
{
enum xt_op op = XT_OP_EQ;
if (info->flags & XT_DEVGROUP_MATCH_SRC) {
if (info->flags & XT_DEVGROUP_INVERT_SRC)
op = XT_OP_NEQ;
xt_xlate_add(xl, "iifgroup ");
print_devgroup_xlate(info->src_group, op,
info->src_mask, xl, numeric);
}
if (info->flags & XT_DEVGROUP_MATCH_DST) {
if (info->flags & XT_DEVGROUP_INVERT_DST)
op = XT_OP_NEQ;
xt_xlate_add(xl, "oifgroup ");
print_devgroup_xlate(info->dst_group, op,
info->dst_mask, xl, numeric);
}
}
static int devgroup_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct xt_devgroup_info *info = (const void *)params->match->data;
devgroup_show_xlate(info, xl, 0);
return 1;
}
static struct xtables_match devgroup_mt_reg = {
.name = "devgroup",
.version = XTABLES_VERSION,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_devgroup_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_devgroup_info)),
.help = devgroup_help,
.print = devgroup_print,
.save = devgroup_save,
.x6_parse = devgroup_parse,
.x6_fcheck = devgroup_check,
.x6_options = devgroup_opts,
.xlate = devgroup_xlate,
};
void _init(void)
{
devgroups = xtables_lmap_init(f_devgroups);
if (devgroups == NULL && errno != ENOENT)
fprintf(stderr, "Warning: %s: %s\n", f_devgroups,
strerror(errno));
xtables_register_match(&devgroup_mt_reg);
}
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