/usr/src/west-chamber-20100405+svn20111107.r124/extensions/libxt_UDPENCAP.c is in west-chamber-dkms 20100405+svn20111107.r124-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 | /*
* "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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