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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_NETFILTER_H |
3 | #define __LINUX_NETFILTER_H | |
4 | ||
1da177e4 | 5 | #include <linux/init.h> |
1da177e4 LT |
6 | #include <linux/skbuff.h> |
7 | #include <linux/net.h> | |
8 | #include <linux/if.h> | |
2e3075a2 JE |
9 | #include <linux/in.h> |
10 | #include <linux/in6.h> | |
1da177e4 LT |
11 | #include <linux/wait.h> |
12 | #include <linux/list.h> | |
d1c85c2e | 13 | #include <linux/static_key.h> |
a263653e | 14 | #include <linux/netfilter_defs.h> |
085db2c0 EB |
15 | #include <linux/netdevice.h> |
16 | #include <net/net_namespace.h> | |
a263653e | 17 | |
1da177e4 | 18 | #ifdef CONFIG_NETFILTER |
f615df76 FW |
19 | static inline int NF_DROP_GETERR(int verdict) |
20 | { | |
21 | return -(verdict >> NF_VERDICT_QBITS); | |
22 | } | |
1da177e4 | 23 | |
b8beedd2 PM |
24 | static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
25 | const union nf_inet_addr *a2) | |
26 | { | |
27 | return a1->all[0] == a2->all[0] && | |
28 | a1->all[1] == a2->all[1] && | |
29 | a1->all[2] == a2->all[2] && | |
30 | a1->all[3] == a2->all[3]; | |
31 | } | |
32 | ||
efdedd54 DF |
33 | static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, |
34 | union nf_inet_addr *result, | |
35 | const union nf_inet_addr *mask) | |
36 | { | |
37 | result->all[0] = a1->all[0] & mask->all[0]; | |
38 | result->all[1] = a1->all[1] & mask->all[1]; | |
39 | result->all[2] = a1->all[2] & mask->all[2]; | |
40 | result->all[3] = a1->all[3] & mask->all[3]; | |
41 | } | |
42 | ||
a0f4ecf3 | 43 | int netfilter_init(void); |
1da177e4 | 44 | |
1da177e4 | 45 | struct sk_buff; |
1da177e4 | 46 | |
795aa6ef | 47 | struct nf_hook_ops; |
cfdfab31 | 48 | |
1c984f8a DM |
49 | struct sock; |
50 | ||
cfdfab31 DM |
51 | struct nf_hook_state { |
52 | unsigned int hook; | |
cfdfab31 DM |
53 | u_int8_t pf; |
54 | struct net_device *in; | |
55 | struct net_device *out; | |
1c984f8a | 56 | struct sock *sk; |
b11b1f65 | 57 | struct net *net; |
0c4b51f0 | 58 | int (*okfn)(struct net *, struct sock *, struct sk_buff *); |
cfdfab31 DM |
59 | }; |
60 | ||
e3b37f11 AC |
61 | typedef unsigned int nf_hookfn(void *priv, |
62 | struct sk_buff *skb, | |
63 | const struct nf_hook_state *state); | |
64 | struct nf_hook_ops { | |
e3b37f11 AC |
65 | /* User fills in from here down. */ |
66 | nf_hookfn *hook; | |
67 | struct net_device *dev; | |
68 | void *priv; | |
69 | u_int8_t pf; | |
70 | unsigned int hooknum; | |
71 | /* Hooks are ordered in ascending priority. */ | |
72 | int priority; | |
73 | }; | |
74 | ||
75 | struct nf_hook_entry { | |
d415b9eb AC |
76 | nf_hookfn *hook; |
77 | void *priv; | |
e3b37f11 AC |
78 | }; |
79 | ||
8c873e21 FW |
80 | struct nf_hook_entries_rcu_head { |
81 | struct rcu_head head; | |
82 | void *allocation; | |
83 | }; | |
84 | ||
960632ec AC |
85 | struct nf_hook_entries { |
86 | u16 num_hook_entries; | |
87 | /* padding */ | |
88 | struct nf_hook_entry hooks[]; | |
89 | ||
8c873e21 FW |
90 | /* trailer: pointers to original orig_ops of each hook, |
91 | * followed by rcu_head and scratch space used for freeing | |
92 | * the structure via call_rcu. | |
960632ec | 93 | * |
8c873e21 FW |
94 | * This is not part of struct nf_hook_entry since its only |
95 | * needed in slow path (hook register/unregister): | |
960632ec | 96 | * const struct nf_hook_ops *orig_ops[] |
8c873e21 FW |
97 | * |
98 | * For the same reason, we store this at end -- its | |
99 | * only needed when a hook is deleted, not during | |
100 | * packet path processing: | |
101 | * struct nf_hook_entries_rcu_head head | |
960632ec AC |
102 | */ |
103 | }; | |
0aa8c57a | 104 | |
960632ec | 105 | static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e) |
0aa8c57a | 106 | { |
960632ec AC |
107 | unsigned int n = e->num_hook_entries; |
108 | const void *hook_end; | |
109 | ||
110 | hook_end = &e->hooks[n]; /* this is *past* ->hooks[]! */ | |
111 | ||
112 | return (struct nf_hook_ops **)hook_end; | |
0aa8c57a AC |
113 | } |
114 | ||
115 | static inline int | |
116 | nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb, | |
117 | struct nf_hook_state *state) | |
118 | { | |
d415b9eb | 119 | return entry->hook(entry->priv, skb, state); |
0aa8c57a AC |
120 | } |
121 | ||
107a9f4d DM |
122 | static inline void nf_hook_state_init(struct nf_hook_state *p, |
123 | unsigned int hook, | |
1610a73c | 124 | u_int8_t pf, |
107a9f4d DM |
125 | struct net_device *indev, |
126 | struct net_device *outdev, | |
1c984f8a | 127 | struct sock *sk, |
b11b1f65 | 128 | struct net *net, |
0c4b51f0 | 129 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
107a9f4d DM |
130 | { |
131 | p->hook = hook; | |
107a9f4d DM |
132 | p->pf = pf; |
133 | p->in = indev; | |
134 | p->out = outdev; | |
1c984f8a | 135 | p->sk = sk; |
b11b1f65 | 136 | p->net = net; |
107a9f4d DM |
137 | p->okfn = okfn; |
138 | } | |
139 | ||
1da177e4 | 140 | |
1da177e4 | 141 | |
d94d9fee | 142 | struct nf_sockopt_ops { |
1da177e4 LT |
143 | struct list_head list; |
144 | ||
76108cea | 145 | u_int8_t pf; |
1da177e4 LT |
146 | |
147 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
148 | int set_optmin; | |
149 | int set_optmax; | |
150 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
c30f540b | 151 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
152 | int (*compat_set)(struct sock *sk, int optval, |
153 | void __user *user, unsigned int len); | |
c30f540b | 154 | #endif |
1da177e4 LT |
155 | int get_optmin; |
156 | int get_optmax; | |
157 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 158 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
159 | int (*compat_get)(struct sock *sk, int optval, |
160 | void __user *user, int *len); | |
c30f540b | 161 | #endif |
16fcec35 NH |
162 | /* Use the module struct to lock set/get code in place */ |
163 | struct module *owner; | |
1da177e4 LT |
164 | }; |
165 | ||
1da177e4 | 166 | /* Function to register/unregister hook points. */ |
085db2c0 EB |
167 | int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops); |
168 | void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops); | |
169 | int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg, | |
170 | unsigned int n); | |
171 | void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg, | |
172 | unsigned int n); | |
173 | ||
1da177e4 LT |
174 | /* Functions to register get/setsockopt ranges (non-inclusive). You |
175 | need to check permissions yourself! */ | |
176 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
177 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
178 | ||
d1c85c2e | 179 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 180 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
a2d7ec58 ED |
181 | #endif |
182 | ||
01886bd9 | 183 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state, |
960632ec | 184 | const struct nf_hook_entries *e, unsigned int i); |
16a6677f PM |
185 | |
186 | /** | |
1610a73c | 187 | * nf_hook - call a netfilter hook |
b8d0aad0 | 188 | * |
16a6677f PM |
189 | * Returns 1 if the hook has allowed the packet to pass. The function |
190 | * okfn must be invoked by the caller in this case. Any other return | |
191 | * value indicates the packet has been consumed by the hook. | |
192 | */ | |
1610a73c PNA |
193 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
194 | struct sock *sk, struct sk_buff *skb, | |
195 | struct net_device *indev, struct net_device *outdev, | |
196 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
16a6677f | 197 | { |
b0f38338 | 198 | struct nf_hook_entries *hook_head = NULL; |
e3b37f11 | 199 | int ret = 1; |
af4610c3 FW |
200 | |
201 | #ifdef HAVE_JUMP_LABEL | |
202 | if (__builtin_constant_p(pf) && | |
203 | __builtin_constant_p(hook) && | |
204 | !static_key_false(&nf_hooks_needed[pf][hook])) | |
205 | return 1; | |
206 | #endif | |
207 | ||
e3b37f11 | 208 | rcu_read_lock(); |
b0f38338 FW |
209 | switch (pf) { |
210 | case NFPROTO_IPV4: | |
211 | hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]); | |
212 | break; | |
213 | case NFPROTO_IPV6: | |
214 | hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]); | |
215 | break; | |
216 | case NFPROTO_ARP: | |
2a95183a | 217 | #ifdef CONFIG_NETFILTER_FAMILY_ARP |
421c119f FW |
218 | if (WARN_ON_ONCE(hook >= ARRAY_SIZE(net->nf.hooks_arp))) |
219 | break; | |
b0f38338 | 220 | hook_head = rcu_dereference(net->nf.hooks_arp[hook]); |
2a95183a | 221 | #endif |
b0f38338 FW |
222 | break; |
223 | case NFPROTO_BRIDGE: | |
2a95183a | 224 | #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE |
b0f38338 | 225 | hook_head = rcu_dereference(net->nf.hooks_bridge[hook]); |
2a95183a | 226 | #endif |
b0f38338 | 227 | break; |
bb4badf3 | 228 | #if IS_ENABLED(CONFIG_DECNET) |
b0f38338 FW |
229 | case NFPROTO_DECNET: |
230 | hook_head = rcu_dereference(net->nf.hooks_decnet[hook]); | |
231 | break; | |
bb4badf3 | 232 | #endif |
b0f38338 FW |
233 | default: |
234 | WARN_ON_ONCE(1); | |
235 | break; | |
236 | } | |
237 | ||
e3b37f11 | 238 | if (hook_head) { |
107a9f4d | 239 | struct nf_hook_state state; |
cfdfab31 | 240 | |
01886bd9 | 241 | nf_hook_state_init(&state, hook, pf, indev, outdev, |
1610a73c | 242 | sk, net, okfn); |
fe72926b | 243 | |
960632ec | 244 | ret = nf_hook_slow(skb, &state, hook_head, 0); |
cfdfab31 | 245 | } |
e3b37f11 AC |
246 | rcu_read_unlock(); |
247 | ||
248 | return ret; | |
16a6677f PM |
249 | } |
250 | ||
1da177e4 LT |
251 | /* Activate hook; either okfn or kfree_skb called, unless a hook |
252 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
253 | the consequences). | |
254 | ||
255 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
256 | accepted. | |
257 | */ | |
258 | ||
259 | /* RR: | |
260 | > I don't want nf_hook to return anything because people might forget | |
261 | > about async and trust the return value to mean "packet was ok". | |
262 | ||
263 | AK: | |
264 | Just document it clearly, then you can expect some sense from kernel | |
265 | coders :) | |
266 | */ | |
267 | ||
2249065f | 268 | static inline int |
29a26a56 | 269 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
7026b1dd | 270 | struct sk_buff *skb, struct net_device *in, struct net_device *out, |
0c4b51f0 EB |
271 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), |
272 | bool cond) | |
2249065f | 273 | { |
4bac6b18 PM |
274 | int ret; |
275 | ||
276 | if (!cond || | |
1610a73c | 277 | ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1)) |
0c4b51f0 | 278 | ret = okfn(net, sk, skb); |
2249065f JE |
279 | return ret; |
280 | } | |
1da177e4 | 281 | |
2249065f | 282 | static inline int |
29a26a56 | 283 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, |
2249065f | 284 | struct net_device *in, struct net_device *out, |
0c4b51f0 | 285 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
2249065f | 286 | { |
1610a73c PNA |
287 | int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn); |
288 | if (ret == 1) | |
289 | ret = okfn(net, sk, skb); | |
290 | return ret; | |
2249065f | 291 | } |
1da177e4 | 292 | |
17266ee9 EC |
293 | static inline void |
294 | NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
295 | struct list_head *head, struct net_device *in, struct net_device *out, | |
296 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
297 | { | |
298 | struct sk_buff *skb, *next; | |
9f17dbf0 | 299 | struct list_head sublist; |
17266ee9 | 300 | |
9f17dbf0 | 301 | INIT_LIST_HEAD(&sublist); |
17266ee9 | 302 | list_for_each_entry_safe(skb, next, head, list) { |
9f17dbf0 EC |
303 | list_del(&skb->list); |
304 | if (nf_hook(pf, hook, net, sk, skb, in, out, okfn) == 1) | |
305 | list_add_tail(&skb->list, &sublist); | |
17266ee9 | 306 | } |
9f17dbf0 EC |
307 | /* Put passed packets back on main list */ |
308 | list_splice(&sublist, head); | |
17266ee9 EC |
309 | } |
310 | ||
1da177e4 | 311 | /* Call setsockopt() */ |
76108cea | 312 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 313 | unsigned int len); |
76108cea | 314 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 315 | int *len); |
c30f540b | 316 | #ifdef CONFIG_COMPAT |
76108cea | 317 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 318 | char __user *opt, unsigned int len); |
76108cea | 319 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 320 | char __user *opt, int *len); |
c30f540b | 321 | #endif |
3fdadf7d | 322 | |
089af26c HW |
323 | /* Call this before modifying an existing packet: ensures it is |
324 | modifiable and linear to the point you care about (writable_len). | |
325 | Returns true or false. */ | |
a0f4ecf3 | 326 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 327 | |
1841a4c7 | 328 | struct flowi; |
02f014d8 | 329 | struct nf_queue_entry; |
c01cd429 | 330 | |
ef71fe27 PNA |
331 | __sum16 nf_checksum(struct sk_buff *skb, unsigned int hook, |
332 | unsigned int dataoff, u_int8_t protocol, | |
333 | unsigned short family); | |
422c346f | 334 | |
f7dcbe2f PNA |
335 | __sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook, |
336 | unsigned int dataoff, unsigned int len, | |
337 | u_int8_t protocol, unsigned short family); | |
3f87c08c PNA |
338 | int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl, |
339 | bool strict, unsigned short family); | |
ce388f45 | 340 | int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry); |
d63a6507 | 341 | |
eb9c7ebe | 342 | #include <net/flow.h> |
2c205dd3 PNA |
343 | |
344 | struct nf_conn; | |
345 | enum nf_nat_manip_type; | |
346 | struct nlattr; | |
368982cd | 347 | enum ip_conntrack_dir; |
2c205dd3 PNA |
348 | |
349 | struct nf_nat_hook { | |
350 | int (*parse_nat_setup)(struct nf_conn *ct, enum nf_nat_manip_type manip, | |
351 | const struct nlattr *attr); | |
352 | void (*decode_session)(struct sk_buff *skb, struct flowi *fl); | |
368982cd PNA |
353 | unsigned int (*manip_pkt)(struct sk_buff *skb, struct nf_conn *ct, |
354 | enum nf_nat_manip_type mtype, | |
355 | enum ip_conntrack_dir dir); | |
2c205dd3 PNA |
356 | }; |
357 | ||
358 | extern struct nf_nat_hook __rcu *nf_nat_hook; | |
eb9c7ebe PM |
359 | |
360 | static inline void | |
76108cea | 361 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 362 | { |
051578cc | 363 | #ifdef CONFIG_NF_NAT_NEEDED |
2c205dd3 | 364 | struct nf_nat_hook *nat_hook; |
eb9c7ebe | 365 | |
c7232c99 | 366 | rcu_read_lock(); |
2c205dd3 | 367 | nat_hook = rcu_dereference(nf_nat_hook); |
155fb5c5 | 368 | if (nat_hook && nat_hook->decode_session) |
2c205dd3 | 369 | nat_hook->decode_session(skb, fl); |
c7232c99 | 370 | rcu_read_unlock(); |
eb9c7ebe PM |
371 | #endif |
372 | } | |
373 | ||
1da177e4 | 374 | #else /* !CONFIG_NETFILTER */ |
008027c3 AB |
375 | static inline int |
376 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
377 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
378 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), | |
379 | bool cond) | |
380 | { | |
381 | return okfn(net, sk, skb); | |
382 | } | |
383 | ||
384 | static inline int | |
385 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
386 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
387 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
388 | { | |
389 | return okfn(net, sk, skb); | |
390 | } | |
391 | ||
17266ee9 EC |
392 | static inline void |
393 | NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
394 | struct list_head *head, struct net_device *in, struct net_device *out, | |
395 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
396 | { | |
397 | /* nothing to do */ | |
398 | } | |
399 | ||
29a26a56 EB |
400 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
401 | struct sock *sk, struct sk_buff *skb, | |
402 | struct net_device *indev, struct net_device *outdev, | |
0c4b51f0 | 403 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
f53b61d8 | 404 | { |
9c92d348 | 405 | return 1; |
f53b61d8 | 406 | } |
f53b61d8 | 407 | struct flowi; |
eb9c7ebe | 408 | static inline void |
76108cea JE |
409 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
410 | { | |
411 | } | |
1da177e4 LT |
412 | #endif /*CONFIG_NETFILTER*/ |
413 | ||
5f79e0f9 | 414 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
62da9865 DB |
415 | #include <linux/netfilter/nf_conntrack_zones_common.h> |
416 | ||
312a0c16 | 417 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 418 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
b60a6040 THJ |
419 | struct nf_conntrack_tuple; |
420 | bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple, | |
421 | const struct sk_buff *skb); | |
b7bd1809 PNA |
422 | #else |
423 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
b60a6040 THJ |
424 | struct nf_conntrack_tuple; |
425 | static inline bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple, | |
426 | const struct sk_buff *skb) | |
427 | { | |
428 | return false; | |
429 | } | |
b7bd1809 | 430 | #endif |
9cb01766 PNA |
431 | |
432 | struct nf_conn; | |
41d73ec0 | 433 | enum ip_conntrack_info; |
1f4b2439 PNA |
434 | |
435 | struct nf_ct_hook { | |
368982cd | 436 | int (*update)(struct net *net, struct sk_buff *skb); |
1f4b2439 | 437 | void (*destroy)(struct nf_conntrack *); |
b60a6040 THJ |
438 | bool (*get_tuple_skb)(struct nf_conntrack_tuple *, |
439 | const struct sk_buff *); | |
1f4b2439 PNA |
440 | }; |
441 | extern struct nf_ct_hook __rcu *nf_ct_hook; | |
442 | ||
9cb01766 PNA |
443 | struct nlattr; |
444 | ||
a4b4766c | 445 | struct nfnl_ct_hook { |
224a0597 | 446 | struct nf_conn *(*get_ct)(const struct sk_buff *skb, |
b7bd1809 | 447 | enum ip_conntrack_info *ctinfo); |
9cb01766 | 448 | size_t (*build_size)(const struct nf_conn *ct); |
b7bd1809 PNA |
449 | int (*build)(struct sk_buff *skb, struct nf_conn *ct, |
450 | enum ip_conntrack_info ctinfo, | |
451 | u_int16_t ct_attr, u_int16_t ct_info_attr); | |
9cb01766 | 452 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); |
bd077937 PNA |
453 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
454 | u32 portid, u32 report); | |
8c88f87c | 455 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 456 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 457 | }; |
a4b4766c | 458 | extern struct nfnl_ct_hook __rcu *nfnl_ct_hook; |
5f79e0f9 | 459 | |
e7c8899f FW |
460 | /** |
461 | * nf_skb_duplicated - TEE target has sent a packet | |
462 | * | |
463 | * When a xtables target sends a packet, the OUTPUT and POSTROUTING | |
464 | * hooks are traversed again, i.e. nft and xtables are invoked recursively. | |
465 | * | |
466 | * This is used by xtables TEE target to prevent the duplicated skb from | |
467 | * being duplicated again. | |
468 | */ | |
469 | DECLARE_PER_CPU(bool, nf_skb_duplicated); | |
470 | ||
1da177e4 | 471 | #endif /*__LINUX_NETFILTER_H*/ |