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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2010 Patrick McHardy <kaber@trash.net>
4 */
5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6#include <linux/module.h>
7#include <linux/gfp.h>
8#include <linux/skbuff.h>
9#include <linux/netfilter_ipv4/ip_tables.h>
10#include <linux/netfilter_ipv6/ip6_tables.h>
11#include <linux/netfilter/x_tables.h>
12#include <linux/netfilter/xt_CT.h>
13#include <net/netfilter/nf_conntrack.h>
14#include <net/netfilter/nf_conntrack_l4proto.h>
15#include <net/netfilter/nf_conntrack_helper.h>
16#include <net/netfilter/nf_conntrack_ecache.h>
17#include <net/netfilter/nf_conntrack_timeout.h>
18#include <net/netfilter/nf_conntrack_zones.h>
19
20static inline int xt_ct_target(struct sk_buff *skb, struct nf_conn *ct)
21{
22 /* Previously seen (loopback)? Ignore. */
23 if (skb->_nfct != 0)
24 return XT_CONTINUE;
25
26 if (ct) {
27 atomic_inc(&ct->ct_general.use);
28 nf_ct_set(skb, ct, IP_CT_NEW);
29 } else {
30 nf_ct_set(skb, ct, IP_CT_UNTRACKED);
31 }
32
33 return XT_CONTINUE;
34}
35
36static unsigned int xt_ct_target_v0(struct sk_buff *skb,
37 const struct xt_action_param *par)
38{
39 const struct xt_ct_target_info *info = par->targinfo;
40 struct nf_conn *ct = info->ct;
41
42 return xt_ct_target(skb, ct);
43}
44
45static unsigned int xt_ct_target_v1(struct sk_buff *skb,
46 const struct xt_action_param *par)
47{
48 const struct xt_ct_target_info_v1 *info = par->targinfo;
49 struct nf_conn *ct = info->ct;
50
51 return xt_ct_target(skb, ct);
52}
53
54static u8 xt_ct_find_proto(const struct xt_tgchk_param *par)
55{
56 if (par->family == NFPROTO_IPV4) {
57 const struct ipt_entry *e = par->entryinfo;
58
59 if (e->ip.invflags & IPT_INV_PROTO)
60 return 0;
61 return e->ip.proto;
62 } else if (par->family == NFPROTO_IPV6) {
63 const struct ip6t_entry *e = par->entryinfo;
64
65 if (e->ipv6.invflags & IP6T_INV_PROTO)
66 return 0;
67 return e->ipv6.proto;
68 } else
69 return 0;
70}
71
72static int
73xt_ct_set_helper(struct nf_conn *ct, const char *helper_name,
74 const struct xt_tgchk_param *par)
75{
76 struct nf_conntrack_helper *helper;
77 struct nf_conn_help *help;
78 u8 proto;
79
80 proto = xt_ct_find_proto(par);
81 if (!proto) {
82 pr_info_ratelimited("You must specify a L4 protocol and not use inversions on it\n");
83 return -ENOENT;
84 }
85
86 helper = nf_conntrack_helper_try_module_get(helper_name, par->family,
87 proto);
88 if (helper == NULL) {
89 pr_info_ratelimited("No such helper \"%s\"\n", helper_name);
90 return -ENOENT;
91 }
92
93 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
94 if (help == NULL) {
95 nf_conntrack_helper_put(helper);
96 return -ENOMEM;
97 }
98
99 help->helper = helper;
100 return 0;
101}
102
103static int
104xt_ct_set_timeout(struct nf_conn *ct, const struct xt_tgchk_param *par,
105 const char *timeout_name)
106{
107#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
108 const struct nf_conntrack_l4proto *l4proto;
109 u8 proto;
110
111 proto = xt_ct_find_proto(par);
112 if (!proto) {
113 pr_info_ratelimited("You must specify a L4 protocol and not "
114 "use inversions on it");
115 return -EINVAL;
116 }
117 l4proto = nf_ct_l4proto_find(proto);
118 return nf_ct_set_timeout(par->net, ct, par->family, l4proto->l4proto,
119 timeout_name);
120
121#else
122 return -EOPNOTSUPP;
123#endif
124}
125
126static u16 xt_ct_flags_to_dir(const struct xt_ct_target_info_v1 *info)
127{
128 switch (info->flags & (XT_CT_ZONE_DIR_ORIG |
129 XT_CT_ZONE_DIR_REPL)) {
130 case XT_CT_ZONE_DIR_ORIG:
131 return NF_CT_ZONE_DIR_ORIG;
132 case XT_CT_ZONE_DIR_REPL:
133 return NF_CT_ZONE_DIR_REPL;
134 default:
135 return NF_CT_DEFAULT_ZONE_DIR;
136 }
137}
138
139static int xt_ct_tg_check(const struct xt_tgchk_param *par,
140 struct xt_ct_target_info_v1 *info)
141{
142 struct nf_conntrack_zone zone;
143 struct nf_conn_help *help;
144 struct nf_conn *ct;
145 int ret = -EOPNOTSUPP;
146
147 if (info->flags & XT_CT_NOTRACK) {
148 ct = NULL;
149 goto out;
150 }
151
152#ifndef CONFIG_NF_CONNTRACK_ZONES
153 if (info->zone || info->flags & (XT_CT_ZONE_DIR_ORIG |
154 XT_CT_ZONE_DIR_REPL |
155 XT_CT_ZONE_MARK))
156 goto err1;
157#endif
158
159 ret = nf_ct_netns_get(par->net, par->family);
160 if (ret < 0)
161 goto err1;
162
163 memset(&zone, 0, sizeof(zone));
164 zone.id = info->zone;
165 zone.dir = xt_ct_flags_to_dir(info);
166 if (info->flags & XT_CT_ZONE_MARK)
167 zone.flags |= NF_CT_FLAG_MARK;
168
169 ct = nf_ct_tmpl_alloc(par->net, &zone, GFP_KERNEL);
170 if (!ct) {
171 ret = -ENOMEM;
172 goto err2;
173 }
174
175 if ((info->ct_events || info->exp_events) &&
176 !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
177 GFP_KERNEL)) {
178 ret = -EINVAL;
179 goto err3;
180 }
181
182 if (info->helper[0]) {
183 if (strnlen(info->helper, sizeof(info->helper)) == sizeof(info->helper)) {
184 ret = -ENAMETOOLONG;
185 goto err3;
186 }
187
188 ret = xt_ct_set_helper(ct, info->helper, par);
189 if (ret < 0)
190 goto err3;
191 }
192
193 if (info->timeout[0]) {
194 if (strnlen(info->timeout, sizeof(info->timeout)) == sizeof(info->timeout)) {
195 ret = -ENAMETOOLONG;
196 goto err4;
197 }
198
199 ret = xt_ct_set_timeout(ct, par, info->timeout);
200 if (ret < 0)
201 goto err4;
202 }
203 __set_bit(IPS_CONFIRMED_BIT, &ct->status);
204 nf_conntrack_get(&ct->ct_general);
205out:
206 info->ct = ct;
207 return 0;
208
209err4:
210 help = nfct_help(ct);
211 if (help)
212 nf_conntrack_helper_put(help->helper);
213err3:
214 nf_ct_tmpl_free(ct);
215err2:
216 nf_ct_netns_put(par->net, par->family);
217err1:
218 return ret;
219}
220
221static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
222{
223 struct xt_ct_target_info *info = par->targinfo;
224 struct xt_ct_target_info_v1 info_v1 = {
225 .flags = info->flags,
226 .zone = info->zone,
227 .ct_events = info->ct_events,
228 .exp_events = info->exp_events,
229 };
230 int ret;
231
232 if (info->flags & ~XT_CT_NOTRACK)
233 return -EINVAL;
234
235 memcpy(info_v1.helper, info->helper, sizeof(info->helper));
236
237 ret = xt_ct_tg_check(par, &info_v1);
238 if (ret < 0)
239 return ret;
240
241 info->ct = info_v1.ct;
242
243 return ret;
244}
245
246static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
247{
248 struct xt_ct_target_info_v1 *info = par->targinfo;
249
250 if (info->flags & ~XT_CT_NOTRACK)
251 return -EINVAL;
252
253 return xt_ct_tg_check(par, par->targinfo);
254}
255
256static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par)
257{
258 struct xt_ct_target_info_v1 *info = par->targinfo;
259
260 if (info->flags & ~XT_CT_MASK)
261 return -EINVAL;
262
263 return xt_ct_tg_check(par, par->targinfo);
264}
265
266static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
267 struct xt_ct_target_info_v1 *info)
268{
269 struct nf_conn *ct = info->ct;
270 struct nf_conn_help *help;
271
272 if (ct) {
273 help = nfct_help(ct);
274 if (help)
275 nf_conntrack_helper_put(help->helper);
276
277 nf_ct_netns_put(par->net, par->family);
278
279 nf_ct_destroy_timeout(ct);
280 nf_ct_put(info->ct);
281 }
282}
283
284static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
285{
286 struct xt_ct_target_info *info = par->targinfo;
287 struct xt_ct_target_info_v1 info_v1 = {
288 .flags = info->flags,
289 .zone = info->zone,
290 .ct_events = info->ct_events,
291 .exp_events = info->exp_events,
292 .ct = info->ct,
293 };
294 memcpy(info_v1.helper, info->helper, sizeof(info->helper));
295
296 xt_ct_tg_destroy(par, &info_v1);
297}
298
299static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
300{
301 xt_ct_tg_destroy(par, par->targinfo);
302}
303
304static struct xt_target xt_ct_tg_reg[] __read_mostly = {
305 {
306 .name = "CT",
307 .family = NFPROTO_UNSPEC,
308 .targetsize = sizeof(struct xt_ct_target_info),
309 .usersize = offsetof(struct xt_ct_target_info, ct),
310 .checkentry = xt_ct_tg_check_v0,
311 .destroy = xt_ct_tg_destroy_v0,
312 .target = xt_ct_target_v0,
313 .table = "raw",
314 .me = THIS_MODULE,
315 },
316 {
317 .name = "CT",
318 .family = NFPROTO_UNSPEC,
319 .revision = 1,
320 .targetsize = sizeof(struct xt_ct_target_info_v1),
321 .usersize = offsetof(struct xt_ct_target_info, ct),
322 .checkentry = xt_ct_tg_check_v1,
323 .destroy = xt_ct_tg_destroy_v1,
324 .target = xt_ct_target_v1,
325 .table = "raw",
326 .me = THIS_MODULE,
327 },
328 {
329 .name = "CT",
330 .family = NFPROTO_UNSPEC,
331 .revision = 2,
332 .targetsize = sizeof(struct xt_ct_target_info_v1),
333 .usersize = offsetof(struct xt_ct_target_info, ct),
334 .checkentry = xt_ct_tg_check_v2,
335 .destroy = xt_ct_tg_destroy_v1,
336 .target = xt_ct_target_v1,
337 .table = "raw",
338 .me = THIS_MODULE,
339 },
340};
341
342static unsigned int
343notrack_tg(struct sk_buff *skb, const struct xt_action_param *par)
344{
345 /* Previously seen (loopback)? Ignore. */
346 if (skb->_nfct != 0)
347 return XT_CONTINUE;
348
349 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
350
351 return XT_CONTINUE;
352}
353
354static int notrack_chk(const struct xt_tgchk_param *par)
355{
356 if (!par->net->xt.notrack_deprecated_warning) {
357 pr_info("netfilter: NOTRACK target is deprecated, "
358 "use CT instead or upgrade iptables\n");
359 par->net->xt.notrack_deprecated_warning = true;
360 }
361 return 0;
362}
363
364static struct xt_target notrack_tg_reg __read_mostly = {
365 .name = "NOTRACK",
366 .revision = 0,
367 .family = NFPROTO_UNSPEC,
368 .checkentry = notrack_chk,
369 .target = notrack_tg,
370 .table = "raw",
371 .me = THIS_MODULE,
372};
373
374static int __init xt_ct_tg_init(void)
375{
376 int ret;
377
378 ret = xt_register_target(¬rack_tg_reg);
379 if (ret < 0)
380 return ret;
381
382 ret = xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
383 if (ret < 0) {
384 xt_unregister_target(¬rack_tg_reg);
385 return ret;
386 }
387 return 0;
388}
389
390static void __exit xt_ct_tg_exit(void)
391{
392 xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
393 xt_unregister_target(¬rack_tg_reg);
394}
395
396module_init(xt_ct_tg_init);
397module_exit(xt_ct_tg_exit);
398
399MODULE_LICENSE("GPL");
400MODULE_DESCRIPTION("Xtables: connection tracking target");
401MODULE_ALIAS("ipt_CT");
402MODULE_ALIAS("ip6t_CT");
403MODULE_ALIAS("ipt_NOTRACK");
404MODULE_ALIAS("ip6t_NOTRACK");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2010 Patrick McHardy <kaber@trash.net>
4 */
5#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
6#include <linux/module.h>
7#include <linux/gfp.h>
8#include <linux/skbuff.h>
9#include <linux/netfilter_ipv4/ip_tables.h>
10#include <linux/netfilter_ipv6/ip6_tables.h>
11#include <linux/netfilter/x_tables.h>
12#include <linux/netfilter/xt_CT.h>
13#include <net/netfilter/nf_conntrack.h>
14#include <net/netfilter/nf_conntrack_l4proto.h>
15#include <net/netfilter/nf_conntrack_helper.h>
16#include <net/netfilter/nf_conntrack_ecache.h>
17#include <net/netfilter/nf_conntrack_timeout.h>
18#include <net/netfilter/nf_conntrack_zones.h>
19
20static inline int xt_ct_target(struct sk_buff *skb, struct nf_conn *ct)
21{
22 /* Previously seen (loopback)? Ignore. */
23 if (skb->_nfct != 0)
24 return XT_CONTINUE;
25
26 if (ct) {
27 refcount_inc(&ct->ct_general.use);
28 nf_ct_set(skb, ct, IP_CT_NEW);
29 } else {
30 nf_ct_set(skb, ct, IP_CT_UNTRACKED);
31 }
32
33 return XT_CONTINUE;
34}
35
36static unsigned int xt_ct_target_v0(struct sk_buff *skb,
37 const struct xt_action_param *par)
38{
39 const struct xt_ct_target_info *info = par->targinfo;
40 struct nf_conn *ct = info->ct;
41
42 return xt_ct_target(skb, ct);
43}
44
45static unsigned int xt_ct_target_v1(struct sk_buff *skb,
46 const struct xt_action_param *par)
47{
48 const struct xt_ct_target_info_v1 *info = par->targinfo;
49 struct nf_conn *ct = info->ct;
50
51 return xt_ct_target(skb, ct);
52}
53
54static u8 xt_ct_find_proto(const struct xt_tgchk_param *par)
55{
56 if (par->family == NFPROTO_IPV4) {
57 const struct ipt_entry *e = par->entryinfo;
58
59 if (e->ip.invflags & IPT_INV_PROTO)
60 return 0;
61 return e->ip.proto;
62 } else if (par->family == NFPROTO_IPV6) {
63 const struct ip6t_entry *e = par->entryinfo;
64
65 if (e->ipv6.invflags & IP6T_INV_PROTO)
66 return 0;
67 return e->ipv6.proto;
68 } else
69 return 0;
70}
71
72static int
73xt_ct_set_helper(struct nf_conn *ct, const char *helper_name,
74 const struct xt_tgchk_param *par)
75{
76 struct nf_conntrack_helper *helper;
77 struct nf_conn_help *help;
78 u8 proto;
79
80 proto = xt_ct_find_proto(par);
81 if (!proto) {
82 pr_info_ratelimited("You must specify a L4 protocol and not use inversions on it\n");
83 return -ENOENT;
84 }
85
86 helper = nf_conntrack_helper_try_module_get(helper_name, par->family,
87 proto);
88 if (helper == NULL) {
89 pr_info_ratelimited("No such helper \"%s\"\n", helper_name);
90 return -ENOENT;
91 }
92
93 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
94 if (help == NULL) {
95 nf_conntrack_helper_put(helper);
96 return -ENOMEM;
97 }
98
99 rcu_assign_pointer(help->helper, helper);
100 return 0;
101}
102
103static int
104xt_ct_set_timeout(struct nf_conn *ct, const struct xt_tgchk_param *par,
105 const char *timeout_name)
106{
107#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
108 const struct nf_conntrack_l4proto *l4proto;
109 u8 proto;
110
111 proto = xt_ct_find_proto(par);
112 if (!proto) {
113 pr_info_ratelimited("You must specify a L4 protocol and not "
114 "use inversions on it");
115 return -EINVAL;
116 }
117 l4proto = nf_ct_l4proto_find(proto);
118 return nf_ct_set_timeout(par->net, ct, par->family, l4proto->l4proto,
119 timeout_name);
120
121#else
122 return -EOPNOTSUPP;
123#endif
124}
125
126static u16 xt_ct_flags_to_dir(const struct xt_ct_target_info_v1 *info)
127{
128 switch (info->flags & (XT_CT_ZONE_DIR_ORIG |
129 XT_CT_ZONE_DIR_REPL)) {
130 case XT_CT_ZONE_DIR_ORIG:
131 return NF_CT_ZONE_DIR_ORIG;
132 case XT_CT_ZONE_DIR_REPL:
133 return NF_CT_ZONE_DIR_REPL;
134 default:
135 return NF_CT_DEFAULT_ZONE_DIR;
136 }
137}
138
139static void xt_ct_put_helper(struct nf_conn_help *help)
140{
141 struct nf_conntrack_helper *helper;
142
143 if (!help)
144 return;
145
146 /* not yet exposed to other cpus, or ruleset
147 * already detached (post-replacement).
148 */
149 helper = rcu_dereference_raw(help->helper);
150 if (helper)
151 nf_conntrack_helper_put(helper);
152}
153
154static int xt_ct_tg_check(const struct xt_tgchk_param *par,
155 struct xt_ct_target_info_v1 *info)
156{
157 struct nf_conntrack_zone zone;
158 struct nf_conn_help *help;
159 struct nf_conn *ct;
160 int ret = -EOPNOTSUPP;
161
162 if (info->flags & XT_CT_NOTRACK) {
163 ct = NULL;
164 goto out;
165 }
166
167#ifndef CONFIG_NF_CONNTRACK_ZONES
168 if (info->zone || info->flags & (XT_CT_ZONE_DIR_ORIG |
169 XT_CT_ZONE_DIR_REPL |
170 XT_CT_ZONE_MARK))
171 goto err1;
172#endif
173
174 ret = nf_ct_netns_get(par->net, par->family);
175 if (ret < 0)
176 goto err1;
177
178 memset(&zone, 0, sizeof(zone));
179 zone.id = info->zone;
180 zone.dir = xt_ct_flags_to_dir(info);
181 if (info->flags & XT_CT_ZONE_MARK)
182 zone.flags |= NF_CT_FLAG_MARK;
183
184 ct = nf_ct_tmpl_alloc(par->net, &zone, GFP_KERNEL);
185 if (!ct) {
186 ret = -ENOMEM;
187 goto err2;
188 }
189
190 if ((info->ct_events || info->exp_events) &&
191 !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
192 GFP_KERNEL)) {
193 ret = -EINVAL;
194 goto err3;
195 }
196
197 if (info->helper[0]) {
198 if (strnlen(info->helper, sizeof(info->helper)) == sizeof(info->helper)) {
199 ret = -ENAMETOOLONG;
200 goto err3;
201 }
202
203 ret = xt_ct_set_helper(ct, info->helper, par);
204 if (ret < 0)
205 goto err3;
206 }
207
208 if (info->timeout[0]) {
209 if (strnlen(info->timeout, sizeof(info->timeout)) == sizeof(info->timeout)) {
210 ret = -ENAMETOOLONG;
211 goto err4;
212 }
213
214 ret = xt_ct_set_timeout(ct, par, info->timeout);
215 if (ret < 0)
216 goto err4;
217 }
218 __set_bit(IPS_CONFIRMED_BIT, &ct->status);
219out:
220 info->ct = ct;
221 return 0;
222
223err4:
224 help = nfct_help(ct);
225 xt_ct_put_helper(help);
226err3:
227 nf_ct_tmpl_free(ct);
228err2:
229 nf_ct_netns_put(par->net, par->family);
230err1:
231 return ret;
232}
233
234static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
235{
236 struct xt_ct_target_info *info = par->targinfo;
237 struct xt_ct_target_info_v1 info_v1 = {
238 .flags = info->flags,
239 .zone = info->zone,
240 .ct_events = info->ct_events,
241 .exp_events = info->exp_events,
242 };
243 int ret;
244
245 if (info->flags & ~XT_CT_NOTRACK)
246 return -EINVAL;
247
248 memcpy(info_v1.helper, info->helper, sizeof(info->helper));
249
250 ret = xt_ct_tg_check(par, &info_v1);
251 if (ret < 0)
252 return ret;
253
254 info->ct = info_v1.ct;
255
256 return ret;
257}
258
259static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
260{
261 struct xt_ct_target_info_v1 *info = par->targinfo;
262
263 if (info->flags & ~XT_CT_NOTRACK)
264 return -EINVAL;
265
266 return xt_ct_tg_check(par, par->targinfo);
267}
268
269static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par)
270{
271 struct xt_ct_target_info_v1 *info = par->targinfo;
272
273 if (info->flags & ~XT_CT_MASK)
274 return -EINVAL;
275
276 return xt_ct_tg_check(par, par->targinfo);
277}
278
279static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
280 struct xt_ct_target_info_v1 *info)
281{
282 struct nf_conn *ct = info->ct;
283 struct nf_conn_help *help;
284
285 if (ct) {
286 help = nfct_help(ct);
287 xt_ct_put_helper(help);
288
289 nf_ct_netns_put(par->net, par->family);
290
291 nf_ct_destroy_timeout(ct);
292 nf_ct_put(info->ct);
293 }
294}
295
296static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
297{
298 struct xt_ct_target_info *info = par->targinfo;
299 struct xt_ct_target_info_v1 info_v1 = {
300 .flags = info->flags,
301 .zone = info->zone,
302 .ct_events = info->ct_events,
303 .exp_events = info->exp_events,
304 .ct = info->ct,
305 };
306 memcpy(info_v1.helper, info->helper, sizeof(info->helper));
307
308 xt_ct_tg_destroy(par, &info_v1);
309}
310
311static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
312{
313 xt_ct_tg_destroy(par, par->targinfo);
314}
315
316static struct xt_target xt_ct_tg_reg[] __read_mostly = {
317 {
318 .name = "CT",
319 .family = NFPROTO_UNSPEC,
320 .targetsize = sizeof(struct xt_ct_target_info),
321 .usersize = offsetof(struct xt_ct_target_info, ct),
322 .checkentry = xt_ct_tg_check_v0,
323 .destroy = xt_ct_tg_destroy_v0,
324 .target = xt_ct_target_v0,
325 .table = "raw",
326 .me = THIS_MODULE,
327 },
328 {
329 .name = "CT",
330 .family = NFPROTO_UNSPEC,
331 .revision = 1,
332 .targetsize = sizeof(struct xt_ct_target_info_v1),
333 .usersize = offsetof(struct xt_ct_target_info, ct),
334 .checkentry = xt_ct_tg_check_v1,
335 .destroy = xt_ct_tg_destroy_v1,
336 .target = xt_ct_target_v1,
337 .table = "raw",
338 .me = THIS_MODULE,
339 },
340 {
341 .name = "CT",
342 .family = NFPROTO_UNSPEC,
343 .revision = 2,
344 .targetsize = sizeof(struct xt_ct_target_info_v1),
345 .usersize = offsetof(struct xt_ct_target_info, ct),
346 .checkentry = xt_ct_tg_check_v2,
347 .destroy = xt_ct_tg_destroy_v1,
348 .target = xt_ct_target_v1,
349 .table = "raw",
350 .me = THIS_MODULE,
351 },
352};
353
354static unsigned int
355notrack_tg(struct sk_buff *skb, const struct xt_action_param *par)
356{
357 /* Previously seen (loopback)? Ignore. */
358 if (skb->_nfct != 0)
359 return XT_CONTINUE;
360
361 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
362
363 return XT_CONTINUE;
364}
365
366static struct xt_target notrack_tg_reg __read_mostly = {
367 .name = "NOTRACK",
368 .revision = 0,
369 .family = NFPROTO_UNSPEC,
370 .target = notrack_tg,
371 .table = "raw",
372 .me = THIS_MODULE,
373};
374
375static int __init xt_ct_tg_init(void)
376{
377 int ret;
378
379 ret = xt_register_target(¬rack_tg_reg);
380 if (ret < 0)
381 return ret;
382
383 ret = xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
384 if (ret < 0) {
385 xt_unregister_target(¬rack_tg_reg);
386 return ret;
387 }
388 return 0;
389}
390
391static void __exit xt_ct_tg_exit(void)
392{
393 xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
394 xt_unregister_target(¬rack_tg_reg);
395}
396
397module_init(xt_ct_tg_init);
398module_exit(xt_ct_tg_exit);
399
400MODULE_LICENSE("GPL");
401MODULE_DESCRIPTION("Xtables: connection tracking target");
402MODULE_ALIAS("ipt_CT");
403MODULE_ALIAS("ip6t_CT");
404MODULE_ALIAS("ipt_NOTRACK");
405MODULE_ALIAS("ip6t_NOTRACK");