libxt_TEE.c revision d7282413763b0ba85d512c1cd49174b762ff449c 
1/*
2 *	"TEE" target extension for iptables
3 *	Copyright © Sebastian Claßen <sebastian.classen [at] freenet.ag>, 2007
4 *	Jan Engelhardt <jengelh [at] medozas de>, 2007 - 2010
5 *
6 *	This program is free software; you can redistribute it and/or
7 *	modify it under the terms of the GNU General Public License; either
8 *	version 2 of the License, or any later version, as published by the
9 *	Free Software Foundation.
10 */
11#include <sys/socket.h>
12#include <getopt.h>
13#include <stdbool.h>
14#include <stdio.h>
15#include <stdlib.h>
16#include <string.h>
17
18#include <arpa/inet.h>
19#include <net/if.h>
20#include <netinet/in.h>
21
22#include <xtables.h>
23#include <linux/netfilter.h>
24#include <linux/netfilter/x_tables.h>
25#include <linux/netfilter/xt_TEE.h>
26
27enum {
28	O_GATEWAY = 0,
29	O_OIF,
30};
31
32#define s struct xt_tee_tginfo
33static const struct xt_option_entry tee_tg_opts[] = {
34	{.name = "gateway", .id = O_GATEWAY, .type = XTTYPE_HOST,
35	 .flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, gw)},
36	{.name = "oif", .id = O_OIF, .type = XTTYPE_STRING,
37	 .flags = XTOPT_PUT, XTOPT_POINTER(s, oif)},
38	XTOPT_TABLEEND,
39};
40#undef s
41
42static void tee_tg_help(void)
43{
44	printf(
45"TEE target options:\n"
46"  --gateway IPADDR    Route packet via the gateway given by address\n"
47"  --oif NAME          Include oif in route calculation\n"
48"\n");
49}
50
51static void tee_tg_print(const void *ip, const struct xt_entry_target *target,
52                         int numeric)
53{
54	const struct xt_tee_tginfo *info = (const void *)target->data;
55
56	if (numeric)
57		printf(" TEE gw:%s", xtables_ipaddr_to_numeric(&info->gw.in));
58	else
59		printf(" TEE gw:%s", xtables_ipaddr_to_anyname(&info->gw.in));
60	if (*info->oif != '\0')
61		printf(" oif=%s", info->oif);
62}
63
64static void tee_tg6_print(const void *ip, const struct xt_entry_target *target,
65                          int numeric)
66{
67	const struct xt_tee_tginfo *info = (const void *)target->data;
68
69	if (numeric)
70		printf(" TEE gw:%s", xtables_ip6addr_to_numeric(&info->gw.in6));
71	else
72		printf(" TEE gw:%s", xtables_ip6addr_to_anyname(&info->gw.in6));
73	if (*info->oif != '\0')
74		printf(" oif=%s", info->oif);
75}
76
77static void tee_tg_save(const void *ip, const struct xt_entry_target *target)
78{
79	const struct xt_tee_tginfo *info = (const void *)target->data;
80
81	printf(" --gateway %s", xtables_ipaddr_to_numeric(&info->gw.in));
82	if (*info->oif != '\0')
83		printf(" --oif %s", info->oif);
84}
85
86static void tee_tg6_save(const void *ip, const struct xt_entry_target *target)
87{
88	const struct xt_tee_tginfo *info = (const void *)target->data;
89
90	printf(" --gateway %s", xtables_ip6addr_to_numeric(&info->gw.in6));
91	if (*info->oif != '\0')
92		printf(" --oif %s", info->oif);
93}
94
95static struct xtables_target tee_tg_reg = {
96	.name          = "TEE",
97	.version       = XTABLES_VERSION,
98	.revision      = 1,
99	.family        = NFPROTO_IPV4,
100	.size          = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
101	.userspacesize = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
102	.help          = tee_tg_help,
103	.print         = tee_tg_print,
104	.save          = tee_tg_save,
105	.x6_parse      = xtables_option_parse,
106	.x6_options    = tee_tg_opts,
107};
108
109static struct xtables_target tee_tg6_reg = {
110	.name          = "TEE",
111	.version       = XTABLES_VERSION,
112	.revision      = 1,
113	.family        = NFPROTO_IPV6,
114	.size          = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
115	.userspacesize = XT_ALIGN(sizeof(struct xt_tee_tginfo)),
116	.help          = tee_tg_help,
117	.print         = tee_tg6_print,
118	.save          = tee_tg6_save,
119	.x6_parse      = xtables_option_parse,
120	.x6_options    = tee_tg_opts,
121};
122
123void _init(void)
124{
125	xtables_register_target(&tee_tg_reg);
126	xtables_register_target(&tee_tg6_reg);
127}
128