/usr/src/west-chamber-20100405+svn20110916.r119/libxt_UDPENCAP.c is in west-chamber-dkms 20100405+svn20110916.r119-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* "UDPENCAP" target extension for iptables
* Copyright (c) Klzgrad <klzgrad@gmail.com>, 2011
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <stdio.h>
#include <getopt.h>
#include <xtables.h>
#include <arpa/inet.h>
#include "xt_UDPENCAP.h"
enum {
DECAP = 1 << 0,
HAS_SPORT = 1 << 1,
HAS_DPORT = 1 << 2,
};
static const struct option udpencap_tg_opts[] = {
{.name = "decap", .has_arg = true, .val = 'p'},
{.name = "sport", .has_arg = true, .val = 's'},
{.name = "dport", .has_arg = true, .val = 'd'},
{},
};
static void udpencap_tg_help(void)
{
printf("UDPENCAP target options:\n"
" --decap protocol Decapsulate to this protocol\n"
" --sport port Encapsulate with the source port\n"
" --dport port Encapsulate with the destination port\n");
}
static void udpencap_tg_init(struct xt_entry_target *target)
{
struct xt_udpencap_tginfo *info = (void *)target->data;
info->encap = true;
info->proto = IPPROTO_UDP;
}
static int udpencap_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_udpencap_tginfo *info = (void *)(*target)->data;
unsigned int proto, port;
if (invert)
xtables_error(PARAMETER_PROBLEM, "Can't specify ! before parameters");
switch (c) {
case 'p':
xtables_param_act(XTF_ONLY_ONCE, "UDPENCAP", "--decap", *flags & DECAP);
info->encap = false;
if (!xtables_strtoui(optarg, NULL, &proto, 0, 255))
xtables_param_act(XTF_BAD_VALUE, "UDPENCAP", "--decap", optarg);
info->proto = proto;
*flags |= DECAP;
return true;
case 's':
xtables_param_act(XTF_ONLY_ONCE, "UDPENCAP", "--sport", *flags & HAS_SPORT);
if (!xtables_strtoui(optarg, NULL, &port, 0, 65535))
xtables_param_act(XTF_BAD_VALUE, "UDPENCAP", "--sport", optarg);
info->sport = htons(port);
*flags |= HAS_SPORT;
return true;
case 'd':
xtables_param_act(XTF_ONLY_ONCE, "UDPENCAP", "--dport", *flags & HAS_DPORT);
if (!xtables_strtoui(optarg, NULL, &port, 0, 65535))
xtables_param_act(XTF_BAD_VALUE, "UDPENCAP", "--dport", optarg);
info->dport = htons(port);
*flags |= HAS_DPORT;
return true;
}
return false;
}
static void udpencap_tg_check(unsigned int flags)
{
bool encap = !(flags & DECAP);
bool has_sport = flags & HAS_SPORT;
bool has_dport = flags & HAS_DPORT;
if (encap && (!has_sport || !has_dport))
xtables_error(PARAMETER_PROBLEM, "UDPENCAP: \"--sport\" and \"--dport\" are required.");
}
static void udpencap_tg_print(const void *entry, const struct xt_entry_target *target, int numeric)
{
const struct xt_udpencap_tginfo *info = (const void *)target->data;
if (info->encap)
printf(" encap udp sport %u dport %u\n", ntohs(info->sport), ntohs(info->dport));
else
printf(" decap %u", info->proto);
}
static void udpencap_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_udpencap_tginfo *info = (const void *)target->data;
if (info->encap)
printf(" --sport %u --dport %u", ntohs(info->sport), ntohs(info->dport));
else
printf(" --decap %u", info->proto);
}
static struct xtables_target udpencap_tg4_reg = {
.version = XTABLES_VERSION,
.name = "UDPENCAP",
.revision = 0,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_udpencap_tginfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_udpencap_tginfo)),
.help = udpencap_tg_help,
.init = udpencap_tg_init,
.parse = udpencap_tg_parse,
.final_check = udpencap_tg_check,
.print = udpencap_tg_print,
.save = udpencap_tg_save,
.extra_opts = udpencap_tg_opts,
};
static struct xtables_target udpencap_tg6_reg = {
.version = XTABLES_VERSION,
.name = "UDPENCAP",
.revision = 0,
.family = NFPROTO_IPV6,
.size = XT_ALIGN(sizeof(struct xt_udpencap_tginfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_udpencap_tginfo)),
.help = udpencap_tg_help,
.init = udpencap_tg_init,
.parse = udpencap_tg_parse,
.final_check = udpencap_tg_check,
.print = udpencap_tg_print,
.save = udpencap_tg_save,
.extra_opts = udpencap_tg_opts,
};
static __attribute__((constructor)) void udpencap_tg_ldr(void)
{
xtables_register_target(&udpencap_tg4_reg);
xtables_register_target(&udpencap_tg6_reg);
}
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