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/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
* Patrick Schaaf <bof@bof.de>
* Martin Josefsson <gandalf@wlug.westbo.se>
* Copyright (C) 2003-2010 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
*
* 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.
*/
/* Shared library add-on to iptables to add IP set mangling target. */
#include <stdbool.h>
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <ctype.h>
#include <xtables.h>
#include <linux/netfilter/xt_set.h>
#include "libxt_set.h"
/* Revision 0 */
static void
set_target_help_v0(void)
{
printf("SET target options:\n"
" --add-set name flags\n"
" --del-set name flags\n"
" add/del src/dst IP/port from/to named sets,\n"
" where flags are the comma separated list of\n"
" 'src' and 'dst' specifications.\n");
}
static const struct option set_target_opts_v0[] = {
{.name = "add-set", .has_arg = true, .val = '1'},
{.name = "del-set", .has_arg = true, .val = '2'},
XT_GETOPT_TABLEEND,
};
static void
set_target_check_v0(unsigned int flags)
{
if (!flags)
xtables_error(PARAMETER_PROBLEM,
"You must specify either `--add-set' or `--del-set'");
}
static void
set_target_init_v0(struct xt_entry_target *target)
{
struct xt_set_info_target_v0 *info =
(struct xt_set_info_target_v0 *) target->data;
info->add_set.index =
info->del_set.index = IPSET_INVALID_ID;
}
static void
parse_target_v0(char **argv, int invert, unsigned int *flags,
struct xt_set_info_v0 *info, const char *what)
{
if (info->u.flags[0])
xtables_error(PARAMETER_PROBLEM,
"--%s can be specified only once", what);
if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
xtables_error(PARAMETER_PROBLEM,
"Unexpected `!' after --%s", what);
if (!argv[optind]
|| argv[optind][0] == '-' || argv[optind][0] == '!')
xtables_error(PARAMETER_PROBLEM,
"--%s requires two args.", what);
if (strlen(optarg) > IPSET_MAXNAMELEN - 1)
xtables_error(PARAMETER_PROBLEM,
"setname `%s' too long, max %d characters.",
optarg, IPSET_MAXNAMELEN - 1);
get_set_byname(optarg, (struct xt_set_info *)info);
parse_dirs_v0(argv[optind], info);
optind++;
*flags = 1;
}
static int
set_target_parse_v0(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_set_info_target_v0 *myinfo =
(struct xt_set_info_target_v0 *) (*target)->data;
switch (c) {
case '1': /* --add-set <set> <flags> */
parse_target_v0(argv, invert, flags,
&myinfo->add_set, "add-set");
break;
case '2': /* --del-set <set>[:<flags>] <flags> */
parse_target_v0(argv, invert, flags,
&myinfo->del_set, "del-set");
break;
}
return 1;
}
static void
print_target_v0(const char *prefix, const struct xt_set_info_v0 *info)
{
int i;
char setname[IPSET_MAXNAMELEN];
if (info->index == IPSET_INVALID_ID)
return;
get_set_byid(setname, info->index);
printf(" %s %s", prefix, setname);
for (i = 0; i < IPSET_DIM_MAX; i++) {
if (!info->u.flags[i])
break;
printf("%s%s",
i == 0 ? " " : ",",
info->u.flags[i] & IPSET_SRC ? "src" : "dst");
}
}
static void
set_target_print_v0(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_set_info_target_v0 *info = (const void *)target->data;
print_target_v0("add-set", &info->add_set);
print_target_v0("del-set", &info->del_set);
}
static void
set_target_save_v0(const void *ip, const struct xt_entry_target *target)
{
const struct xt_set_info_target_v0 *info = (const void *)target->data;
print_target_v0("--add-set", &info->add_set);
print_target_v0("--del-set", &info->del_set);
}
/* Revision 1 */
#define set_target_help_v1 set_target_help_v0
static void
set_target_init_v1(struct xt_entry_target *target)
{
struct xt_set_info_target_v1 *info =
(struct xt_set_info_target_v1 *) target->data;
info->add_set.index =
info->del_set.index = IPSET_INVALID_ID;
}
#define SET_TARGET_ADD 0x1
#define SET_TARGET_DEL 0x2
#define SET_TARGET_EXIST 0x4
#define SET_TARGET_TIMEOUT 0x8
static void
parse_target(char **argv, int invert, struct xt_set_info *info,
const char *what)
{
if (info->dim)
xtables_error(PARAMETER_PROBLEM,
"--%s can be specified only once", what);
if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
xtables_error(PARAMETER_PROBLEM,
"Unexpected `!' after --%s", what);
if (!argv[optind]
|| argv[optind][0] == '-' || argv[optind][0] == '!')
xtables_error(PARAMETER_PROBLEM,
"--%s requires two args.", what);
if (strlen(optarg) > IPSET_MAXNAMELEN - 1)
xtables_error(PARAMETER_PROBLEM,
"setname `%s' too long, max %d characters.",
optarg, IPSET_MAXNAMELEN - 1);
get_set_byname(optarg, info);
parse_dirs(argv[optind], info);
optind++;
}
static int
set_target_parse_v1(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_set_info_target_v1 *myinfo =
(struct xt_set_info_target_v1 *) (*target)->data;
switch (c) {
case '1': /* --add-set <set> <flags> */
parse_target(argv, invert, &myinfo->add_set, "add-set");
*flags |= SET_TARGET_ADD;
break;
case '2': /* --del-set <set>[:<flags>] <flags> */
parse_target(argv, invert, &myinfo->del_set, "del-set");
*flags |= SET_TARGET_DEL;
break;
}
return 1;
}
#define set_target_check_v1 set_target_check_v0
static void
print_target(const char *prefix, const struct xt_set_info *info)
{
int i;
char setname[IPSET_MAXNAMELEN];
if (info->index == IPSET_INVALID_ID)
return;
get_set_byid(setname, info->index);
printf(" %s %s", prefix, setname);
for (i = 1; i <= info->dim; i++) {
printf("%s%s",
i == 1 ? " " : ",",
info->flags & (1 << i) ? "src" : "dst");
}
}
static void
set_target_print_v1(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_set_info_target_v1 *info = (const void *)target->data;
print_target("add-set", &info->add_set);
print_target("del-set", &info->del_set);
}
static void
set_target_save_v1(const void *ip, const struct xt_entry_target *target)
{
const struct xt_set_info_target_v1 *info = (const void *)target->data;
print_target("--add-set", &info->add_set);
print_target("--del-set", &info->del_set);
}
#define set_target_opts_v1 set_target_opts_v0
/* Revision 2 */
static void
set_target_help_v2(void)
{
printf("SET target options:\n"
" --add-set name flags [--exist] [--timeout n]\n"
" --del-set name flags\n"
" add/del src/dst IP/port from/to named sets,\n"
" where flags are the comma separated list of\n"
" 'src' and 'dst' specifications.\n");
}
static const struct option set_target_opts_v2[] = {
{.name = "add-set", .has_arg = true, .val = '1'},
{.name = "del-set", .has_arg = true, .val = '2'},
{.name = "exist", .has_arg = false, .val = '3'},
{.name = "timeout", .has_arg = true, .val = '4'},
XT_GETOPT_TABLEEND,
};
static void
set_target_check_v2(unsigned int flags)
{
if (!(flags & (SET_TARGET_ADD|SET_TARGET_DEL)))
xtables_error(PARAMETER_PROBLEM,
"You must specify either `--add-set' or `--del-set'");
if (!(flags & SET_TARGET_ADD)) {
if (flags & SET_TARGET_EXIST)
xtables_error(PARAMETER_PROBLEM,
"Flag `--exist' can be used with `--add-set' only");
if (flags & SET_TARGET_TIMEOUT)
xtables_error(PARAMETER_PROBLEM,
"Option `--timeout' can be used with `--add-set' only");
}
}
static void
set_target_init_v2(struct xt_entry_target *target)
{
struct xt_set_info_target_v2 *info =
(struct xt_set_info_target_v2 *) target->data;
info->add_set.index =
info->del_set.index = IPSET_INVALID_ID;
info->timeout = UINT32_MAX;
}
static int
set_target_parse_v2(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_set_info_target_v2 *myinfo =
(struct xt_set_info_target_v2 *) (*target)->data;
unsigned int timeout;
switch (c) {
case '1': /* --add-set <set> <flags> */
parse_target(argv, invert, &myinfo->add_set, "add-set");
*flags |= SET_TARGET_ADD;
break;
case '2': /* --del-set <set>[:<flags>] <flags> */
parse_target(argv, invert, &myinfo->del_set, "del-set");
*flags |= SET_TARGET_DEL;
break;
case '3':
myinfo->flags |= IPSET_FLAG_EXIST;
*flags |= SET_TARGET_EXIST;
break;
case '4':
if (!xtables_strtoui(optarg, NULL, &timeout, 0, UINT32_MAX - 1))
xtables_error(PARAMETER_PROBLEM,
"Invalid value for option --timeout "
"or out of range 0-%u", UINT32_MAX - 1);
myinfo->timeout = timeout;
*flags |= SET_TARGET_TIMEOUT;
break;
}
return 1;
}
static void
set_target_print_v2(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_set_info_target_v2 *info = (const void *)target->data;
print_target("add-set", &info->add_set);
if (info->flags & IPSET_FLAG_EXIST)
printf(" exist");
if (info->timeout != UINT32_MAX)
printf(" timeout %u", info->timeout);
print_target("del-set", &info->del_set);
}
static void
set_target_save_v2(const void *ip, const struct xt_entry_target *target)
{
const struct xt_set_info_target_v2 *info = (const void *)target->data;
print_target("--add-set", &info->add_set);
if (info->flags & IPSET_FLAG_EXIST)
printf(" --exist");
if (info->timeout != UINT32_MAX)
printf(" --timeout %u", info->timeout);
print_target("--del-set", &info->del_set);
}
static struct xtables_target set_tg_reg[] = {
{
.name = "SET",
.revision = 0,
.version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_set_info_target_v0)),
.userspacesize = XT_ALIGN(sizeof(struct xt_set_info_target_v0)),
.help = set_target_help_v0,
.init = set_target_init_v0,
.parse = set_target_parse_v0,
.final_check = set_target_check_v0,
.print = set_target_print_v0,
.save = set_target_save_v0,
.extra_opts = set_target_opts_v0,
},
{
.name = "SET",
.revision = 1,
.version = XTABLES_VERSION,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_set_info_target_v1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_set_info_target_v1)),
.help = set_target_help_v1,
.init = set_target_init_v1,
.parse = set_target_parse_v1,
.final_check = set_target_check_v1,
.print = set_target_print_v1,
.save = set_target_save_v1,
.extra_opts = set_target_opts_v1,
},
{
.name = "SET",
.revision = 2,
.version = XTABLES_VERSION,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_set_info_target_v2)),
.userspacesize = XT_ALIGN(sizeof(struct xt_set_info_target_v2)),
.help = set_target_help_v2,
.init = set_target_init_v2,
.parse = set_target_parse_v2,
.final_check = set_target_check_v2,
.print = set_target_print_v2,
.save = set_target_save_v2,
.extra_opts = set_target_opts_v2,
},
};
void _init(void)
{
xtables_register_targets(set_tg_reg, ARRAY_SIZE(set_tg_reg));
}
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