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/*
* Shared library add-on to iptables to add TPROXY target support.
*
* Copyright (C) 2002-2008 BalaBit IT Ltd.
*/
#include <getopt.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_TPROXY.h>
static const struct option tproxy_tg_opts[] = {
{.name = "on-port", .has_arg = true, .val = '1'},
{.name = "on-ip", .has_arg = true, .val = '2'},
{.name = "tproxy-mark", .has_arg = true, .val = '3'},
XT_GETOPT_TABLEEND,
};
enum {
PARAM_ONPORT = 1 << 0,
PARAM_ONIP = 1 << 1,
PARAM_MARK = 1 << 2,
};
static void tproxy_tg_help(void)
{
printf(
"TPROXY target options:\n"
" --on-port port Redirect connection to port, or the original port if 0\n"
" --on-ip ip Optionally redirect to the given IP\n"
" --tproxy-mark value[/mask] Mark packets with the given value/mask\n\n");
}
static void parse_tproxy_lport(const char *s, uint16_t *portp)
{
unsigned int lport;
if (xtables_strtoui(s, NULL, &lport, 0, UINT16_MAX))
*portp = htons(lport);
else
xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--on-port", s);
}
static void parse_tproxy_laddr(const char *s, union nf_inet_addr *addrp,
unsigned int nfproto)
{
struct in6_addr *laddr6 = NULL;
struct in_addr *laddr4 = NULL;
if (nfproto == NFPROTO_IPV6) {
laddr6 = xtables_numeric_to_ip6addr(s);
if (laddr6 == NULL)
goto out;
addrp->in6 = *laddr6;
} else if (nfproto == NFPROTO_IPV4) {
laddr4 = xtables_numeric_to_ipaddr(s);
if (laddr4 == NULL)
goto out;
addrp->in = *laddr4;
}
return;
out:
xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--on-ip", s);
}
static void parse_tproxy_mark(char *s, uint32_t *markp, uint32_t *maskp)
{
unsigned int value, mask = UINT32_MAX;
char *end;
if (!xtables_strtoui(s, &end, &value, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--tproxy-mark", s);
if (*end == '/')
if (!xtables_strtoui(end + 1, &end, &mask, 0, UINT32_MAX))
xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--tproxy-mark", s);
if (*end != '\0')
xtables_param_act(XTF_BAD_VALUE, "TPROXY", "--tproxy-mark", s);
*markp = value;
*maskp = mask;
}
static int tproxy_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_tproxy_target_info *info = (void *)(*target)->data;
switch (c) {
case '1':
xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--on-port", *flags & PARAM_ONPORT);
xtables_param_act(XTF_NO_INVERT, "TPROXY", "--on-port", invert);
parse_tproxy_lport(optarg, &info->lport);
*flags |= PARAM_ONPORT;
return 1;
case '2':
xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--on-ip", *flags & PARAM_ONIP);
xtables_param_act(XTF_NO_INVERT, "TPROXY", "--on-ip", invert);
parse_tproxy_laddr(optarg, (void *)&info->laddr, NFPROTO_IPV4);
*flags |= PARAM_ONIP;
return 1;
case '3':
xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--tproxy-mark", *flags & PARAM_MARK);
xtables_param_act(XTF_NO_INVERT, "TPROXY", "--tproxy-mark", invert);
parse_tproxy_mark(optarg, &info->mark_value, &info->mark_mask);
*flags |= PARAM_MARK;
return 1;
}
return 0;
}
static int
tproxy_tg_parse1(int c, char **argv, int invert, unsigned int *flags,
struct xt_tproxy_target_info_v1 *info, unsigned int nfproto)
{
switch (c) {
case '1':
xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--on-port", *flags & PARAM_ONPORT);
xtables_param_act(XTF_NO_INVERT, "TPROXY", "--on-port", invert);
parse_tproxy_lport(optarg, &info->lport);
*flags |= PARAM_ONPORT;
return true;
case '2':
xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--on-ip", *flags & PARAM_ONIP);
xtables_param_act(XTF_NO_INVERT, "TPROXY", "--on-ip", invert);
parse_tproxy_laddr(optarg, (void *)&info->laddr, nfproto);
*flags |= PARAM_ONIP;
return true;
case '3':
xtables_param_act(XTF_ONLY_ONCE, "TPROXY", "--tproxy-mark", *flags & PARAM_MARK);
xtables_param_act(XTF_NO_INVERT, "TPROXY", "--tproxy-mark", invert);
parse_tproxy_mark(optarg, &info->mark_value, &info->mark_mask);
*flags |= PARAM_MARK;
return true;
}
return false;
}
static int
tproxy_tg_parse4(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_tproxy_target_info_v1 *info = (void *)(*target)->data;
return tproxy_tg_parse1(c, argv, invert, flags, info, NFPROTO_IPV4);
}
static int
tproxy_tg_parse6(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_tproxy_target_info_v1 *info = (void *)(*target)->data;
return tproxy_tg_parse1(c, argv, invert, flags, info, NFPROTO_IPV6);
}
static void tproxy_tg_check(unsigned int flags)
{
if (!(flags & PARAM_ONPORT))
xtables_error(PARAMETER_PROBLEM,
"TPROXY target: Parameter --on-port is required");
}
static void tproxy_tg_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tproxy_target_info *info = (const void *)target->data;
printf(" TPROXY redirect %s:%u mark 0x%x/0x%x",
xtables_ipaddr_to_numeric((const struct in_addr *)&info->laddr),
ntohs(info->lport), (unsigned int)info->mark_value,
(unsigned int)info->mark_mask);
}
static void
tproxy_tg_print4(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tproxy_target_info_v1 *info =
(const void *)target->data;
printf(" TPROXY redirect %s:%u mark 0x%x/0x%x",
xtables_ipaddr_to_numeric(&info->laddr.in),
ntohs(info->lport), (unsigned int)info->mark_value,
(unsigned int)info->mark_mask);
}
static void
tproxy_tg_print6(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tproxy_target_info_v1 *info =
(const void *)target->data;
printf(" TPROXY redirect %s:%u mark 0x%x/0x%x",
xtables_ip6addr_to_numeric(&info->laddr.in6),
ntohs(info->lport), (unsigned int)info->mark_value,
(unsigned int)info->mark_mask);
}
static void tproxy_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tproxy_target_info *info = (const void *)target->data;
printf(" --on-port %u", ntohs(info->lport));
printf(" --on-ip %s",
xtables_ipaddr_to_numeric((const struct in_addr *)&info->laddr));
printf(" --tproxy-mark 0x%x/0x%x",
(unsigned int)info->mark_value, (unsigned int)info->mark_mask);
}
static void
tproxy_tg_save4(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tproxy_target_info_v1 *info;
info = (const void *)target->data;
printf(" --on-port %u", ntohs(info->lport));
printf(" --on-ip %s", xtables_ipaddr_to_numeric(&info->laddr.in));
printf(" --tproxy-mark 0x%x/0x%x",
(unsigned int)info->mark_value, (unsigned int)info->mark_mask);
}
static void
tproxy_tg_save6(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tproxy_target_info_v1 *info;
info = (const void *)target->data;
printf(" --on-port %u", ntohs(info->lport));
printf(" --on-ip %s", xtables_ip6addr_to_numeric(&info->laddr.in6));
printf(" --tproxy-mark 0x%x/0x%x",
(unsigned int)info->mark_value, (unsigned int)info->mark_mask);
}
static struct xtables_target tproxy_tg_reg[] = {
{
.name = "TPROXY",
.revision = 0,
.family = NFPROTO_IPV4,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_tproxy_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info)),
.help = tproxy_tg_help,
.parse = tproxy_tg_parse,
.final_check = tproxy_tg_check,
.print = tproxy_tg_print,
.save = tproxy_tg_save,
.extra_opts = tproxy_tg_opts,
},
{
.name = "TPROXY",
.revision = 1,
.family = NFPROTO_IPV4,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)),
.help = tproxy_tg_help,
.parse = tproxy_tg_parse4,
.final_check = tproxy_tg_check,
.print = tproxy_tg_print4,
.save = tproxy_tg_save4,
.extra_opts = tproxy_tg_opts,
},
{
.name = "TPROXY",
.revision = 1,
.family = NFPROTO_IPV6,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)),
.help = tproxy_tg_help,
.parse = tproxy_tg_parse6,
.final_check = tproxy_tg_check,
.print = tproxy_tg_print6,
.save = tproxy_tg_save6,
.extra_opts = tproxy_tg_opts,
},
};
void _init(void)
{
xtables_register_targets(tproxy_tg_reg, ARRAY_SIZE(tproxy_tg_reg));
}
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