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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/*
2 * Copyright (c) 2010 Patrick McHardy <kaber@trash.net>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9#include <linux/module.h>
10#include <linux/gfp.h>
11#include <linux/skbuff.h>
12#include <linux/netfilter_ipv4/ip_tables.h>
13#include <linux/netfilter_ipv6/ip6_tables.h>
14#include <linux/netfilter/x_tables.h>
15#include <linux/netfilter/xt_CT.h>
16#include <net/netfilter/nf_conntrack.h>
17#include <net/netfilter/nf_conntrack_l4proto.h>
18#include <net/netfilter/nf_conntrack_helper.h>
19#include <net/netfilter/nf_conntrack_ecache.h>
20#include <net/netfilter/nf_conntrack_timeout.h>
21#include <net/netfilter/nf_conntrack_zones.h>
22
23static inline int xt_ct_target(struct sk_buff *skb, struct nf_conn *ct)
24{
25 /* Previously seen (loopback)? Ignore. */
26 if (skb->nfct != NULL)
27 return XT_CONTINUE;
28
29 /* special case the untracked ct : we want the percpu object */
30 if (!ct)
31 ct = nf_ct_untracked_get();
32 atomic_inc(&ct->ct_general.use);
33 skb->nfct = &ct->ct_general;
34 skb->nfctinfo = IP_CT_NEW;
35
36 return XT_CONTINUE;
37}
38
39static unsigned int xt_ct_target_v0(struct sk_buff *skb,
40 const struct xt_action_param *par)
41{
42 const struct xt_ct_target_info *info = par->targinfo;
43 struct nf_conn *ct = info->ct;
44
45 return xt_ct_target(skb, ct);
46}
47
48static unsigned int xt_ct_target_v1(struct sk_buff *skb,
49 const struct xt_action_param *par)
50{
51 const struct xt_ct_target_info_v1 *info = par->targinfo;
52 struct nf_conn *ct = info->ct;
53
54 return xt_ct_target(skb, ct);
55}
56
57static u8 xt_ct_find_proto(const struct xt_tgchk_param *par)
58{
59 if (par->family == NFPROTO_IPV4) {
60 const struct ipt_entry *e = par->entryinfo;
61
62 if (e->ip.invflags & IPT_INV_PROTO)
63 return 0;
64 return e->ip.proto;
65 } else if (par->family == NFPROTO_IPV6) {
66 const struct ip6t_entry *e = par->entryinfo;
67
68 if (e->ipv6.invflags & IP6T_INV_PROTO)
69 return 0;
70 return e->ipv6.proto;
71 } else
72 return 0;
73}
74
75static int
76xt_ct_set_helper(struct nf_conn *ct, const char *helper_name,
77 const struct xt_tgchk_param *par)
78{
79 struct nf_conntrack_helper *helper;
80 struct nf_conn_help *help;
81 u8 proto;
82
83 proto = xt_ct_find_proto(par);
84 if (!proto) {
85 pr_info("You must specify a L4 protocol, and not use "
86 "inversions on it.\n");
87 return -ENOENT;
88 }
89
90 helper = nf_conntrack_helper_try_module_get(helper_name, par->family,
91 proto);
92 if (helper == NULL) {
93 pr_info("No such helper \"%s\"\n", helper_name);
94 return -ENOENT;
95 }
96
97 help = nf_ct_helper_ext_add(ct, helper, GFP_KERNEL);
98 if (help == NULL) {
99 module_put(helper->me);
100 return -ENOMEM;
101 }
102
103 help->helper = helper;
104 return 0;
105}
106
107#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
108static void __xt_ct_tg_timeout_put(struct ctnl_timeout *timeout)
109{
110 typeof(nf_ct_timeout_put_hook) timeout_put;
111
112 timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
113 if (timeout_put)
114 timeout_put(timeout);
115}
116#endif
117
118static int
119xt_ct_set_timeout(struct nf_conn *ct, const struct xt_tgchk_param *par,
120 const char *timeout_name)
121{
122#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
123 typeof(nf_ct_timeout_find_get_hook) timeout_find_get;
124 struct ctnl_timeout *timeout;
125 struct nf_conn_timeout *timeout_ext;
126 struct nf_conntrack_l4proto *l4proto;
127 int ret = 0;
128 u8 proto;
129
130 rcu_read_lock();
131 timeout_find_get = rcu_dereference(nf_ct_timeout_find_get_hook);
132 if (timeout_find_get == NULL) {
133 ret = -ENOENT;
134 pr_info("Timeout policy base is empty\n");
135 goto out;
136 }
137
138 proto = xt_ct_find_proto(par);
139 if (!proto) {
140 ret = -EINVAL;
141 pr_info("You must specify a L4 protocol, and not use "
142 "inversions on it.\n");
143 goto out;
144 }
145
146 timeout = timeout_find_get(par->net, timeout_name);
147 if (timeout == NULL) {
148 ret = -ENOENT;
149 pr_info("No such timeout policy \"%s\"\n", timeout_name);
150 goto out;
151 }
152
153 if (timeout->l3num != par->family) {
154 ret = -EINVAL;
155 pr_info("Timeout policy `%s' can only be used by L3 protocol "
156 "number %d\n", timeout_name, timeout->l3num);
157 goto err_put_timeout;
158 }
159 /* Make sure the timeout policy matches any existing protocol tracker,
160 * otherwise default to generic.
161 */
162 l4proto = __nf_ct_l4proto_find(par->family, proto);
163 if (timeout->l4proto->l4proto != l4proto->l4proto) {
164 ret = -EINVAL;
165 pr_info("Timeout policy `%s' can only be used by L4 protocol "
166 "number %d\n",
167 timeout_name, timeout->l4proto->l4proto);
168 goto err_put_timeout;
169 }
170 timeout_ext = nf_ct_timeout_ext_add(ct, timeout, GFP_ATOMIC);
171 if (timeout_ext == NULL)
172 ret = -ENOMEM;
173
174 rcu_read_unlock();
175 return ret;
176
177err_put_timeout:
178 __xt_ct_tg_timeout_put(timeout);
179out:
180 rcu_read_unlock();
181 return ret;
182#else
183 return -EOPNOTSUPP;
184#endif
185}
186
187static u16 xt_ct_flags_to_dir(const struct xt_ct_target_info_v1 *info)
188{
189 switch (info->flags & (XT_CT_ZONE_DIR_ORIG |
190 XT_CT_ZONE_DIR_REPL)) {
191 case XT_CT_ZONE_DIR_ORIG:
192 return NF_CT_ZONE_DIR_ORIG;
193 case XT_CT_ZONE_DIR_REPL:
194 return NF_CT_ZONE_DIR_REPL;
195 default:
196 return NF_CT_DEFAULT_ZONE_DIR;
197 }
198}
199
200static int xt_ct_tg_check(const struct xt_tgchk_param *par,
201 struct xt_ct_target_info_v1 *info)
202{
203 struct nf_conntrack_zone zone;
204 struct nf_conn *ct;
205 int ret = -EOPNOTSUPP;
206
207 if (info->flags & XT_CT_NOTRACK) {
208 ct = NULL;
209 goto out;
210 }
211
212#ifndef CONFIG_NF_CONNTRACK_ZONES
213 if (info->zone || info->flags & (XT_CT_ZONE_DIR_ORIG |
214 XT_CT_ZONE_DIR_REPL |
215 XT_CT_ZONE_MARK))
216 goto err1;
217#endif
218
219 ret = nf_ct_netns_get(par->net, par->family);
220 if (ret < 0)
221 goto err1;
222
223 memset(&zone, 0, sizeof(zone));
224 zone.id = info->zone;
225 zone.dir = xt_ct_flags_to_dir(info);
226 if (info->flags & XT_CT_ZONE_MARK)
227 zone.flags |= NF_CT_FLAG_MARK;
228
229 ct = nf_ct_tmpl_alloc(par->net, &zone, GFP_KERNEL);
230 if (!ct) {
231 ret = -ENOMEM;
232 goto err2;
233 }
234
235 ret = 0;
236 if ((info->ct_events || info->exp_events) &&
237 !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
238 GFP_KERNEL)) {
239 ret = -EINVAL;
240 goto err3;
241 }
242
243 if (info->helper[0]) {
244 ret = xt_ct_set_helper(ct, info->helper, par);
245 if (ret < 0)
246 goto err3;
247 }
248
249 if (info->timeout[0]) {
250 ret = xt_ct_set_timeout(ct, par, info->timeout);
251 if (ret < 0)
252 goto err3;
253 }
254 __set_bit(IPS_CONFIRMED_BIT, &ct->status);
255 nf_conntrack_get(&ct->ct_general);
256out:
257 info->ct = ct;
258 return 0;
259
260err3:
261 nf_ct_tmpl_free(ct);
262err2:
263 nf_ct_netns_put(par->net, par->family);
264err1:
265 return ret;
266}
267
268static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
269{
270 struct xt_ct_target_info *info = par->targinfo;
271 struct xt_ct_target_info_v1 info_v1 = {
272 .flags = info->flags,
273 .zone = info->zone,
274 .ct_events = info->ct_events,
275 .exp_events = info->exp_events,
276 };
277 int ret;
278
279 if (info->flags & ~XT_CT_NOTRACK)
280 return -EINVAL;
281
282 memcpy(info_v1.helper, info->helper, sizeof(info->helper));
283
284 ret = xt_ct_tg_check(par, &info_v1);
285 if (ret < 0)
286 return ret;
287
288 info->ct = info_v1.ct;
289
290 return ret;
291}
292
293static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
294{
295 struct xt_ct_target_info_v1 *info = par->targinfo;
296
297 if (info->flags & ~XT_CT_NOTRACK)
298 return -EINVAL;
299
300 return xt_ct_tg_check(par, par->targinfo);
301}
302
303static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par)
304{
305 struct xt_ct_target_info_v1 *info = par->targinfo;
306
307 if (info->flags & ~XT_CT_MASK)
308 return -EINVAL;
309
310 return xt_ct_tg_check(par, par->targinfo);
311}
312
313static void xt_ct_destroy_timeout(struct nf_conn *ct)
314{
315#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
316 struct nf_conn_timeout *timeout_ext;
317 typeof(nf_ct_timeout_put_hook) timeout_put;
318
319 rcu_read_lock();
320 timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
321
322 if (timeout_put) {
323 timeout_ext = nf_ct_timeout_find(ct);
324 if (timeout_ext) {
325 timeout_put(timeout_ext->timeout);
326 RCU_INIT_POINTER(timeout_ext->timeout, NULL);
327 }
328 }
329 rcu_read_unlock();
330#endif
331}
332
333static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
334 struct xt_ct_target_info_v1 *info)
335{
336 struct nf_conn *ct = info->ct;
337 struct nf_conn_help *help;
338
339 if (ct && !nf_ct_is_untracked(ct)) {
340 help = nfct_help(ct);
341 if (help)
342 module_put(help->helper->me);
343
344 nf_ct_netns_put(par->net, par->family);
345
346 xt_ct_destroy_timeout(ct);
347 nf_ct_put(info->ct);
348 }
349}
350
351static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
352{
353 struct xt_ct_target_info *info = par->targinfo;
354 struct xt_ct_target_info_v1 info_v1 = {
355 .flags = info->flags,
356 .zone = info->zone,
357 .ct_events = info->ct_events,
358 .exp_events = info->exp_events,
359 .ct = info->ct,
360 };
361 memcpy(info_v1.helper, info->helper, sizeof(info->helper));
362
363 xt_ct_tg_destroy(par, &info_v1);
364}
365
366static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
367{
368 xt_ct_tg_destroy(par, par->targinfo);
369}
370
371static struct xt_target xt_ct_tg_reg[] __read_mostly = {
372 {
373 .name = "CT",
374 .family = NFPROTO_UNSPEC,
375 .targetsize = sizeof(struct xt_ct_target_info),
376 .checkentry = xt_ct_tg_check_v0,
377 .destroy = xt_ct_tg_destroy_v0,
378 .target = xt_ct_target_v0,
379 .table = "raw",
380 .me = THIS_MODULE,
381 },
382 {
383 .name = "CT",
384 .family = NFPROTO_UNSPEC,
385 .revision = 1,
386 .targetsize = sizeof(struct xt_ct_target_info_v1),
387 .checkentry = xt_ct_tg_check_v1,
388 .destroy = xt_ct_tg_destroy_v1,
389 .target = xt_ct_target_v1,
390 .table = "raw",
391 .me = THIS_MODULE,
392 },
393 {
394 .name = "CT",
395 .family = NFPROTO_UNSPEC,
396 .revision = 2,
397 .targetsize = sizeof(struct xt_ct_target_info_v1),
398 .checkentry = xt_ct_tg_check_v2,
399 .destroy = xt_ct_tg_destroy_v1,
400 .target = xt_ct_target_v1,
401 .table = "raw",
402 .me = THIS_MODULE,
403 },
404};
405
406static unsigned int
407notrack_tg(struct sk_buff *skb, const struct xt_action_param *par)
408{
409 /* Previously seen (loopback)? Ignore. */
410 if (skb->nfct != NULL)
411 return XT_CONTINUE;
412
413 skb->nfct = &nf_ct_untracked_get()->ct_general;
414 skb->nfctinfo = IP_CT_NEW;
415 nf_conntrack_get(skb->nfct);
416
417 return XT_CONTINUE;
418}
419
420static int notrack_chk(const struct xt_tgchk_param *par)
421{
422 if (!par->net->xt.notrack_deprecated_warning) {
423 pr_info("netfilter: NOTRACK target is deprecated, "
424 "use CT instead or upgrade iptables\n");
425 par->net->xt.notrack_deprecated_warning = true;
426 }
427 return 0;
428}
429
430static struct xt_target notrack_tg_reg __read_mostly = {
431 .name = "NOTRACK",
432 .revision = 0,
433 .family = NFPROTO_UNSPEC,
434 .checkentry = notrack_chk,
435 .target = notrack_tg,
436 .table = "raw",
437 .me = THIS_MODULE,
438};
439
440static int __init xt_ct_tg_init(void)
441{
442 int ret;
443
444 ret = xt_register_target(¬rack_tg_reg);
445 if (ret < 0)
446 return ret;
447
448 ret = xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
449 if (ret < 0) {
450 xt_unregister_target(¬rack_tg_reg);
451 return ret;
452 }
453 return 0;
454}
455
456static void __exit xt_ct_tg_exit(void)
457{
458 xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
459 xt_unregister_target(¬rack_tg_reg);
460}
461
462module_init(xt_ct_tg_init);
463module_exit(xt_ct_tg_exit);
464
465MODULE_LICENSE("GPL");
466MODULE_DESCRIPTION("Xtables: connection tracking target");
467MODULE_ALIAS("ipt_CT");
468MODULE_ALIAS("ip6t_CT");
469MODULE_ALIAS("ipt_NOTRACK");
470MODULE_ALIAS("ip6t_NOTRACK");