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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");
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 unsigned int xt_ct_target_v0(struct sk_buff *skb,
24 const struct xt_action_param *par)
25{
26 const struct xt_ct_target_info *info = par->targinfo;
27 struct nf_conn *ct = info->ct;
28
29 /* Previously seen (loopback)? Ignore. */
30 if (skb->nfct != NULL)
31 return XT_CONTINUE;
32
33 atomic_inc(&ct->ct_general.use);
34 skb->nfct = &ct->ct_general;
35 skb->nfctinfo = IP_CT_NEW;
36
37 return XT_CONTINUE;
38}
39
40static unsigned int xt_ct_target_v1(struct sk_buff *skb,
41 const struct xt_action_param *par)
42{
43 const struct xt_ct_target_info_v1 *info = par->targinfo;
44 struct nf_conn *ct = info->ct;
45
46 /* Previously seen (loopback)? Ignore. */
47 if (skb->nfct != NULL)
48 return XT_CONTINUE;
49
50 atomic_inc(&ct->ct_general.use);
51 skb->nfct = &ct->ct_general;
52 skb->nfctinfo = IP_CT_NEW;
53
54 return XT_CONTINUE;
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 xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
76{
77 struct xt_ct_target_info *info = par->targinfo;
78 struct nf_conntrack_tuple t;
79 struct nf_conn_help *help;
80 struct nf_conn *ct;
81 int ret = 0;
82 u8 proto;
83
84 if (info->flags & ~XT_CT_NOTRACK)
85 return -EINVAL;
86
87 if (info->flags & XT_CT_NOTRACK) {
88 ct = nf_ct_untracked_get();
89 atomic_inc(&ct->ct_general.use);
90 goto out;
91 }
92
93#ifndef CONFIG_NF_CONNTRACK_ZONES
94 if (info->zone)
95 goto err1;
96#endif
97
98 ret = nf_ct_l3proto_try_module_get(par->family);
99 if (ret < 0)
100 goto err1;
101
102 memset(&t, 0, sizeof(t));
103 ct = nf_conntrack_alloc(par->net, info->zone, &t, &t, GFP_KERNEL);
104 ret = PTR_ERR(ct);
105 if (IS_ERR(ct))
106 goto err2;
107
108 ret = 0;
109 if ((info->ct_events || info->exp_events) &&
110 !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
111 GFP_KERNEL))
112 goto err3;
113
114 if (info->helper[0]) {
115 ret = -ENOENT;
116 proto = xt_ct_find_proto(par);
117 if (!proto) {
118 pr_info("You must specify a L4 protocol, "
119 "and not use inversions on it.\n");
120 goto err3;
121 }
122
123 ret = -ENOMEM;
124 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
125 if (help == NULL)
126 goto err3;
127
128 ret = -ENOENT;
129 help->helper = nf_conntrack_helper_try_module_get(info->helper,
130 par->family,
131 proto);
132 if (help->helper == NULL) {
133 pr_info("No such helper \"%s\"\n", info->helper);
134 goto err3;
135 }
136 }
137
138 __set_bit(IPS_TEMPLATE_BIT, &ct->status);
139 __set_bit(IPS_CONFIRMED_BIT, &ct->status);
140out:
141 info->ct = ct;
142 return 0;
143
144err3:
145 nf_conntrack_free(ct);
146err2:
147 nf_ct_l3proto_module_put(par->family);
148err1:
149 return ret;
150}
151
152#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
153static void __xt_ct_tg_timeout_put(struct ctnl_timeout *timeout)
154{
155 typeof(nf_ct_timeout_put_hook) timeout_put;
156
157 timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
158 if (timeout_put)
159 timeout_put(timeout);
160}
161#endif
162
163static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
164{
165 struct xt_ct_target_info_v1 *info = par->targinfo;
166 struct nf_conntrack_tuple t;
167 struct nf_conn_help *help;
168 struct nf_conn *ct;
169 int ret = 0;
170 u8 proto;
171#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
172 struct ctnl_timeout *timeout;
173#endif
174 if (info->flags & ~XT_CT_NOTRACK)
175 return -EINVAL;
176
177 if (info->flags & XT_CT_NOTRACK) {
178 ct = nf_ct_untracked_get();
179 atomic_inc(&ct->ct_general.use);
180 goto out;
181 }
182
183#ifndef CONFIG_NF_CONNTRACK_ZONES
184 if (info->zone)
185 goto err1;
186#endif
187
188 ret = nf_ct_l3proto_try_module_get(par->family);
189 if (ret < 0)
190 goto err1;
191
192 memset(&t, 0, sizeof(t));
193 ct = nf_conntrack_alloc(par->net, info->zone, &t, &t, GFP_KERNEL);
194 ret = PTR_ERR(ct);
195 if (IS_ERR(ct))
196 goto err2;
197
198 ret = 0;
199 if ((info->ct_events || info->exp_events) &&
200 !nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
201 GFP_KERNEL))
202 goto err3;
203
204 if (info->helper[0]) {
205 ret = -ENOENT;
206 proto = xt_ct_find_proto(par);
207 if (!proto) {
208 pr_info("You must specify a L4 protocol, "
209 "and not use inversions on it.\n");
210 goto err3;
211 }
212
213 ret = -ENOMEM;
214 help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
215 if (help == NULL)
216 goto err3;
217
218 ret = -ENOENT;
219 help->helper = nf_conntrack_helper_try_module_get(info->helper,
220 par->family,
221 proto);
222 if (help->helper == NULL) {
223 pr_info("No such helper \"%s\"\n", info->helper);
224 goto err3;
225 }
226 }
227
228#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
229 if (info->timeout[0]) {
230 typeof(nf_ct_timeout_find_get_hook) timeout_find_get;
231 struct nf_conn_timeout *timeout_ext;
232
233 rcu_read_lock();
234 timeout_find_get =
235 rcu_dereference(nf_ct_timeout_find_get_hook);
236
237 if (timeout_find_get) {
238 const struct ipt_entry *e = par->entryinfo;
239 struct nf_conntrack_l4proto *l4proto;
240
241 if (e->ip.invflags & IPT_INV_PROTO) {
242 ret = -EINVAL;
243 pr_info("You cannot use inversion on "
244 "L4 protocol\n");
245 goto err4;
246 }
247 timeout = timeout_find_get(info->timeout);
248 if (timeout == NULL) {
249 ret = -ENOENT;
250 pr_info("No such timeout policy \"%s\"\n",
251 info->timeout);
252 goto err4;
253 }
254 if (timeout->l3num != par->family) {
255 ret = -EINVAL;
256 pr_info("Timeout policy `%s' can only be "
257 "used by L3 protocol number %d\n",
258 info->timeout, timeout->l3num);
259 goto err5;
260 }
261 /* Make sure the timeout policy matches any existing
262 * protocol tracker, otherwise default to generic.
263 */
264 l4proto = __nf_ct_l4proto_find(par->family,
265 e->ip.proto);
266 if (timeout->l4proto->l4proto != l4proto->l4proto) {
267 ret = -EINVAL;
268 pr_info("Timeout policy `%s' can only be "
269 "used by L4 protocol number %d\n",
270 info->timeout,
271 timeout->l4proto->l4proto);
272 goto err5;
273 }
274 timeout_ext = nf_ct_timeout_ext_add(ct, timeout,
275 GFP_ATOMIC);
276 if (timeout_ext == NULL) {
277 ret = -ENOMEM;
278 goto err5;
279 }
280 } else {
281 ret = -ENOENT;
282 pr_info("Timeout policy base is empty\n");
283 goto err4;
284 }
285 rcu_read_unlock();
286 }
287#endif
288
289 __set_bit(IPS_TEMPLATE_BIT, &ct->status);
290 __set_bit(IPS_CONFIRMED_BIT, &ct->status);
291out:
292 info->ct = ct;
293 return 0;
294
295#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
296err5:
297 __xt_ct_tg_timeout_put(timeout);
298err4:
299 rcu_read_unlock();
300#endif
301err3:
302 nf_conntrack_free(ct);
303err2:
304 nf_ct_l3proto_module_put(par->family);
305err1:
306 return ret;
307}
308
309static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
310{
311 struct xt_ct_target_info *info = par->targinfo;
312 struct nf_conn *ct = info->ct;
313 struct nf_conn_help *help;
314
315 if (!nf_ct_is_untracked(ct)) {
316 help = nfct_help(ct);
317 if (help)
318 module_put(help->helper->me);
319
320 nf_ct_l3proto_module_put(par->family);
321 }
322 nf_ct_put(info->ct);
323}
324
325static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
326{
327 struct xt_ct_target_info_v1 *info = par->targinfo;
328 struct nf_conn *ct = info->ct;
329 struct nf_conn_help *help;
330#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
331 struct nf_conn_timeout *timeout_ext;
332 typeof(nf_ct_timeout_put_hook) timeout_put;
333#endif
334 if (!nf_ct_is_untracked(ct)) {
335 help = nfct_help(ct);
336 if (help)
337 module_put(help->helper->me);
338
339 nf_ct_l3proto_module_put(par->family);
340
341#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
342 rcu_read_lock();
343 timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
344
345 if (timeout_put) {
346 timeout_ext = nf_ct_timeout_find(ct);
347 if (timeout_ext)
348 timeout_put(timeout_ext->timeout);
349 }
350 rcu_read_unlock();
351#endif
352 }
353 nf_ct_put(info->ct);
354}
355
356static struct xt_target xt_ct_tg_reg[] __read_mostly = {
357 {
358 .name = "CT",
359 .family = NFPROTO_UNSPEC,
360 .targetsize = sizeof(struct xt_ct_target_info),
361 .checkentry = xt_ct_tg_check_v0,
362 .destroy = xt_ct_tg_destroy_v0,
363 .target = xt_ct_target_v0,
364 .table = "raw",
365 .me = THIS_MODULE,
366 },
367 {
368 .name = "CT",
369 .family = NFPROTO_UNSPEC,
370 .revision = 1,
371 .targetsize = sizeof(struct xt_ct_target_info_v1),
372 .checkentry = xt_ct_tg_check_v1,
373 .destroy = xt_ct_tg_destroy_v1,
374 .target = xt_ct_target_v1,
375 .table = "raw",
376 .me = THIS_MODULE,
377 },
378};
379
380static int __init xt_ct_tg_init(void)
381{
382 return xt_register_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
383}
384
385static void __exit xt_ct_tg_exit(void)
386{
387 xt_unregister_targets(xt_ct_tg_reg, ARRAY_SIZE(xt_ct_tg_reg));
388}
389
390module_init(xt_ct_tg_init);
391module_exit(xt_ct_tg_exit);
392
393MODULE_LICENSE("GPL");
394MODULE_DESCRIPTION("Xtables: connection tracking target");
395MODULE_ALIAS("ipt_CT");
396MODULE_ALIAS("ip6t_CT");