libxt_SET.c revision 32b8e61e4e5bd405d9ad07bf9468498dfbb19f9e 
1/* Copyright (C) 2000-2002 Joakim Axelsson <gozem@linux.nu>
2 *                         Patrick Schaaf <bof@bof.de>
3 *                         Martin Josefsson <gandalf@wlug.westbo.se>
4 * Copyright (C) 2003-2010 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11/* Shared library add-on to iptables to add IP set mangling target. */
12#include <stdbool.h>
13#include <stdio.h>
14#include <netdb.h>
15#include <string.h>
16#include <stdlib.h>
17#include <getopt.h>
18#include <ctype.h>
19
20#include <xtables.h>
21#include <linux/netfilter/xt_set.h>
22#include "libxt_set.h"
23
24static void
25set_target_help(void)
26{
27	printf("SET target options:\n"
28	       " --add-set name flags\n"
29	       " --del-set name flags\n"
30	       "		add/del src/dst IP/port from/to named sets,\n"
31	       "		where flags are the comma separated list of\n"
32	       "		'src' and 'dst' specifications.\n");
33}
34
35static const struct option set_target_opts[] = {
36	{.name = "add-set", .has_arg = true, .val = '1'},
37	{.name = "del-set", .has_arg = true, .val = '2'},
38	XT_GETOPT_TABLEEND,
39};
40
41static void
42set_target_check(unsigned int flags)
43{
44	if (!flags)
45		xtables_error(PARAMETER_PROBLEM,
46			   "You must specify either `--add-set' or `--del-set'");
47}
48
49static void
50set_target_init_v0(struct xt_entry_target *target)
51{
52	struct xt_set_info_target_v0 *info =
53		(struct xt_set_info_target_v0 *) target->data;
54
55	info->add_set.index =
56	info->del_set.index = IPSET_INVALID_ID;
57
58}
59
60static void
61parse_target_v0(char **argv, int invert, unsigned int *flags,
62		struct xt_set_info_v0 *info, const char *what)
63{
64	if (info->u.flags[0])
65		xtables_error(PARAMETER_PROBLEM,
66			      "--%s can be specified only once", what);
67
68	if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
69		xtables_error(PARAMETER_PROBLEM,
70			      "Unexpected `!' after --%s", what);
71
72	if (!argv[optind]
73	    || argv[optind][0] == '-' || argv[optind][0] == '!')
74		xtables_error(PARAMETER_PROBLEM,
75			      "--%s requires two args.", what);
76
77	if (strlen(optarg) > IPSET_MAXNAMELEN - 1)
78		xtables_error(PARAMETER_PROBLEM,
79			      "setname `%s' too long, max %d characters.",
80			      optarg, IPSET_MAXNAMELEN - 1);
81
82	get_set_byname(optarg, (struct xt_set_info *)info);
83	parse_dirs_v0(argv[optind], info);
84	optind++;
85
86	*flags = 1;
87}
88
89static int
90set_target_parse_v0(int c, char **argv, int invert, unsigned int *flags,
91		    const void *entry, struct xt_entry_target **target)
92{
93	struct xt_set_info_target_v0 *myinfo =
94		(struct xt_set_info_target_v0 *) (*target)->data;
95
96	switch (c) {
97	case '1':		/* --add-set <set> <flags> */
98		parse_target_v0(argv, invert, flags,
99				&myinfo->add_set, "add-set");
100		break;
101	case '2':		/* --del-set <set>[:<flags>] <flags> */
102		parse_target_v0(argv, invert, flags,
103				&myinfo->del_set, "del-set");
104		break;
105
106	default:
107		return 0;
108	}
109	return 1;
110}
111
112static void
113print_target_v0(const char *prefix, const struct xt_set_info_v0 *info)
114{
115	int i;
116	char setname[IPSET_MAXNAMELEN];
117
118	if (info->index == IPSET_INVALID_ID)
119		return;
120	get_set_byid(setname, info->index);
121	printf("%s %s", prefix, setname);
122	for (i = 0; i < IPSET_DIM_MAX; i++) {
123		if (!info->u.flags[i])
124			break;
125		printf("%s%s",
126		       i == 0 ? " " : ",",
127		       info->u.flags[i] & IPSET_SRC ? "src" : "dst");
128	}
129	printf(" ");
130}
131
132static void
133set_target_print_v0(const void *ip, const struct xt_entry_target *target,
134                    int numeric)
135{
136	const struct xt_set_info_target_v0 *info = (const void *)target->data;
137
138	print_target_v0("add-set", &info->add_set);
139	print_target_v0("del-set", &info->del_set);
140}
141
142static void
143set_target_save_v0(const void *ip, const struct xt_entry_target *target)
144{
145	const struct xt_set_info_target_v0 *info = (const void *)target->data;
146
147	print_target_v0("--add-set", &info->add_set);
148	print_target_v0("--del-set", &info->del_set);
149}
150
151static void
152set_target_init(struct xt_entry_target *target)
153{
154	struct xt_set_info_target *info =
155		(struct xt_set_info_target *) target->data;
156
157	info->add_set.index =
158	info->del_set.index = IPSET_INVALID_ID;
159
160}
161
162static void
163parse_target(char **argv, int invert, unsigned int *flags,
164	     struct xt_set_info *info, const char *what)
165{
166	if (info->dim)
167		xtables_error(PARAMETER_PROBLEM,
168			      "--%s can be specified only once", what);
169
170	if (xtables_check_inverse(optarg, &invert, NULL, 0, argv))
171		xtables_error(PARAMETER_PROBLEM,
172			      "Unexpected `!' after --%s", what);
173
174	if (!argv[optind]
175	    || argv[optind][0] == '-' || argv[optind][0] == '!')
176		xtables_error(PARAMETER_PROBLEM,
177			      "--%s requires two args.", what);
178
179	if (strlen(optarg) > IPSET_MAXNAMELEN - 1)
180		xtables_error(PARAMETER_PROBLEM,
181			      "setname `%s' too long, max %d characters.",
182			      optarg, IPSET_MAXNAMELEN - 1);
183
184	get_set_byname(optarg, info);
185	parse_dirs(argv[optind], info);
186	optind++;
187
188	*flags = 1;
189}
190
191static int
192set_target_parse(int c, char **argv, int invert, unsigned int *flags,
193		 const void *entry, struct xt_entry_target **target)
194{
195	struct xt_set_info_target *myinfo =
196		(struct xt_set_info_target *) (*target)->data;
197
198	switch (c) {
199	case '1':		/* --add-set <set> <flags> */
200		parse_target(argv, invert, flags,
201			     &myinfo->add_set, "add-set");
202		break;
203	case '2':		/* --del-set <set>[:<flags>] <flags> */
204		parse_target(argv, invert, flags,
205			     &myinfo->del_set, "del-set");
206		break;
207
208	default:
209		return 0;
210	}
211	return 1;
212}
213
214static void
215print_target(const char *prefix, const struct xt_set_info *info)
216{
217	int i;
218	char setname[IPSET_MAXNAMELEN];
219
220	if (info->index == IPSET_INVALID_ID)
221		return;
222	get_set_byid(setname, info->index);
223	printf("%s %s", prefix, setname);
224	for (i = 1; i <= IPSET_DIM_MAX; i++) {
225		printf("%s%s",
226		       i == 1 ? " " : ",",
227		       info->flags & (1 << i) ? "src" : "dst");
228	}
229	printf(" ");
230}
231
232static void
233set_target_print(const void *ip, const struct xt_entry_target *target,
234                 int numeric)
235{
236	const struct xt_set_info_target *info = (const void *)target->data;
237
238	print_target("add-set", &info->add_set);
239	print_target("del-set", &info->del_set);
240}
241
242static void
243set_target_save(const void *ip, const struct xt_entry_target *target)
244{
245	const struct xt_set_info_target *info = (const void *)target->data;
246
247	print_target("--add-set", &info->add_set);
248	print_target("--del-set", &info->del_set);
249}
250
251static struct xtables_target set_tg_reg[] = {
252	{
253		.name		= "SET",
254		.revision	= 0,
255		.version	= XTABLES_VERSION,
256		.family		= NFPROTO_IPV4,
257		.size		= XT_ALIGN(sizeof(struct xt_set_info_target_v0)),
258		.userspacesize	= XT_ALIGN(sizeof(struct xt_set_info_target_v0)),
259		.help		= set_target_help,
260		.init		= set_target_init_v0,
261		.parse		= set_target_parse_v0,
262		.final_check	= set_target_check,
263		.print		= set_target_print_v0,
264		.save		= set_target_save_v0,
265		.extra_opts	= set_target_opts,
266	},
267	{
268		.name		= "SET",
269		.revision	= 1,
270		.version	= XTABLES_VERSION,
271		.family		= NFPROTO_UNSPEC,
272		.size		= XT_ALIGN(sizeof(struct xt_set_info_target)),
273		.userspacesize	= XT_ALIGN(sizeof(struct xt_set_info_target)),
274		.help		= set_target_help,
275		.init		= set_target_init,
276		.parse		= set_target_parse,
277		.final_check	= set_target_check,
278		.print		= set_target_print,
279		.save		= set_target_save,
280		.extra_opts	= set_target_opts,
281	},
282};
283
284void _init(void)
285{
286	xtables_register_targets(set_tg_reg, ARRAY_SIZE(set_tg_reg));
287}
288