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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 | ||
960632ec AC |
80 | struct nf_hook_entries { |
81 | u16 num_hook_entries; | |
82 | /* padding */ | |
83 | struct nf_hook_entry hooks[]; | |
84 | ||
85 | /* trailer: pointers to original orig_ops of each hook. | |
86 | * | |
87 | * This is not part of struct nf_hook_entry since its only | |
88 | * needed in slow path (hook register/unregister). | |
89 | * | |
90 | * const struct nf_hook_ops *orig_ops[] | |
91 | */ | |
92 | }; | |
0aa8c57a | 93 | |
960632ec | 94 | static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e) |
0aa8c57a | 95 | { |
960632ec AC |
96 | unsigned int n = e->num_hook_entries; |
97 | const void *hook_end; | |
98 | ||
99 | hook_end = &e->hooks[n]; /* this is *past* ->hooks[]! */ | |
100 | ||
101 | return (struct nf_hook_ops **)hook_end; | |
0aa8c57a AC |
102 | } |
103 | ||
104 | static inline int | |
105 | nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb, | |
106 | struct nf_hook_state *state) | |
107 | { | |
d415b9eb | 108 | return entry->hook(entry->priv, skb, state); |
0aa8c57a AC |
109 | } |
110 | ||
107a9f4d DM |
111 | static inline void nf_hook_state_init(struct nf_hook_state *p, |
112 | unsigned int hook, | |
1610a73c | 113 | u_int8_t pf, |
107a9f4d DM |
114 | struct net_device *indev, |
115 | struct net_device *outdev, | |
1c984f8a | 116 | struct sock *sk, |
b11b1f65 | 117 | struct net *net, |
0c4b51f0 | 118 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
107a9f4d DM |
119 | { |
120 | p->hook = hook; | |
107a9f4d DM |
121 | p->pf = pf; |
122 | p->in = indev; | |
123 | p->out = outdev; | |
1c984f8a | 124 | p->sk = sk; |
b11b1f65 | 125 | p->net = net; |
107a9f4d DM |
126 | p->okfn = okfn; |
127 | } | |
128 | ||
1da177e4 | 129 | |
1da177e4 | 130 | |
d94d9fee | 131 | struct nf_sockopt_ops { |
1da177e4 LT |
132 | struct list_head list; |
133 | ||
76108cea | 134 | u_int8_t pf; |
1da177e4 LT |
135 | |
136 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
137 | int set_optmin; | |
138 | int set_optmax; | |
139 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
c30f540b | 140 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
141 | int (*compat_set)(struct sock *sk, int optval, |
142 | void __user *user, unsigned int len); | |
c30f540b | 143 | #endif |
1da177e4 LT |
144 | int get_optmin; |
145 | int get_optmax; | |
146 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 147 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
148 | int (*compat_get)(struct sock *sk, int optval, |
149 | void __user *user, int *len); | |
c30f540b | 150 | #endif |
16fcec35 NH |
151 | /* Use the module struct to lock set/get code in place */ |
152 | struct module *owner; | |
1da177e4 LT |
153 | }; |
154 | ||
1da177e4 | 155 | /* Function to register/unregister hook points. */ |
085db2c0 EB |
156 | int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops); |
157 | void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops); | |
158 | int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg, | |
159 | unsigned int n); | |
160 | void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg, | |
161 | unsigned int n); | |
162 | ||
1da177e4 LT |
163 | /* Functions to register get/setsockopt ranges (non-inclusive). You |
164 | need to check permissions yourself! */ | |
165 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
166 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
167 | ||
d1c85c2e | 168 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 169 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
a2d7ec58 ED |
170 | #endif |
171 | ||
01886bd9 | 172 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state, |
960632ec | 173 | const struct nf_hook_entries *e, unsigned int i); |
16a6677f PM |
174 | |
175 | /** | |
1610a73c | 176 | * nf_hook - call a netfilter hook |
b8d0aad0 | 177 | * |
16a6677f PM |
178 | * Returns 1 if the hook has allowed the packet to pass. The function |
179 | * okfn must be invoked by the caller in this case. Any other return | |
180 | * value indicates the packet has been consumed by the hook. | |
181 | */ | |
1610a73c PNA |
182 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
183 | struct sock *sk, struct sk_buff *skb, | |
184 | struct net_device *indev, struct net_device *outdev, | |
185 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
16a6677f | 186 | { |
960632ec | 187 | struct nf_hook_entries *hook_head; |
e3b37f11 | 188 | int ret = 1; |
af4610c3 FW |
189 | |
190 | #ifdef HAVE_JUMP_LABEL | |
191 | if (__builtin_constant_p(pf) && | |
192 | __builtin_constant_p(hook) && | |
193 | !static_key_false(&nf_hooks_needed[pf][hook])) | |
194 | return 1; | |
195 | #endif | |
196 | ||
e3b37f11 AC |
197 | rcu_read_lock(); |
198 | hook_head = rcu_dereference(net->nf.hooks[pf][hook]); | |
199 | if (hook_head) { | |
107a9f4d | 200 | struct nf_hook_state state; |
cfdfab31 | 201 | |
01886bd9 | 202 | nf_hook_state_init(&state, hook, pf, indev, outdev, |
1610a73c | 203 | sk, net, okfn); |
fe72926b | 204 | |
960632ec | 205 | ret = nf_hook_slow(skb, &state, hook_head, 0); |
cfdfab31 | 206 | } |
e3b37f11 AC |
207 | rcu_read_unlock(); |
208 | ||
209 | return ret; | |
16a6677f PM |
210 | } |
211 | ||
1da177e4 LT |
212 | /* Activate hook; either okfn or kfree_skb called, unless a hook |
213 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
214 | the consequences). | |
215 | ||
216 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
217 | accepted. | |
218 | */ | |
219 | ||
220 | /* RR: | |
221 | > I don't want nf_hook to return anything because people might forget | |
222 | > about async and trust the return value to mean "packet was ok". | |
223 | ||
224 | AK: | |
225 | Just document it clearly, then you can expect some sense from kernel | |
226 | coders :) | |
227 | */ | |
228 | ||
2249065f | 229 | static inline int |
29a26a56 | 230 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
7026b1dd | 231 | struct sk_buff *skb, struct net_device *in, struct net_device *out, |
0c4b51f0 EB |
232 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), |
233 | bool cond) | |
2249065f | 234 | { |
4bac6b18 PM |
235 | int ret; |
236 | ||
237 | if (!cond || | |
1610a73c | 238 | ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1)) |
0c4b51f0 | 239 | ret = okfn(net, sk, skb); |
2249065f JE |
240 | return ret; |
241 | } | |
1da177e4 | 242 | |
2249065f | 243 | static inline int |
29a26a56 | 244 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, |
2249065f | 245 | struct net_device *in, struct net_device *out, |
0c4b51f0 | 246 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
2249065f | 247 | { |
1610a73c PNA |
248 | int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn); |
249 | if (ret == 1) | |
250 | ret = okfn(net, sk, skb); | |
251 | return ret; | |
2249065f | 252 | } |
1da177e4 LT |
253 | |
254 | /* Call setsockopt() */ | |
76108cea | 255 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 256 | unsigned int len); |
76108cea | 257 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 258 | int *len); |
c30f540b | 259 | #ifdef CONFIG_COMPAT |
76108cea | 260 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 261 | char __user *opt, unsigned int len); |
76108cea | 262 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 263 | char __user *opt, int *len); |
c30f540b | 264 | #endif |
3fdadf7d | 265 | |
089af26c HW |
266 | /* Call this before modifying an existing packet: ensures it is |
267 | modifiable and linear to the point you care about (writable_len). | |
268 | Returns true or false. */ | |
a0f4ecf3 | 269 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 270 | |
1841a4c7 | 271 | struct flowi; |
02f014d8 | 272 | struct nf_queue_entry; |
c01cd429 | 273 | |
bce8032e PM |
274 | struct nf_afinfo { |
275 | unsigned short family; | |
b51655b9 | 276 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 277 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
278 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
279 | unsigned int hook, | |
280 | unsigned int dataoff, | |
281 | unsigned int len, | |
282 | u_int8_t protocol); | |
31ad3dd6 | 283 | int (*route)(struct net *net, struct dst_entry **dst, |
0fae2e77 | 284 | struct flowi *fl, bool strict); |
bce8032e | 285 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 286 | struct nf_queue_entry *entry); |
d815d90b | 287 | int (*reroute)(struct net *net, struct sk_buff *skb, |
02f014d8 | 288 | const struct nf_queue_entry *entry); |
bce8032e | 289 | int route_key_size; |
2cc7d573 HW |
290 | }; |
291 | ||
0e60ebe0 | 292 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
1e796fda | 293 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
bce8032e PM |
294 | { |
295 | return rcu_dereference(nf_afinfo[family]); | |
296 | } | |
2cc7d573 | 297 | |
b51655b9 | 298 | static inline __sum16 |
422c346f PM |
299 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
300 | u_int8_t protocol, unsigned short family) | |
301 | { | |
1e796fda | 302 | const struct nf_afinfo *afinfo; |
b51655b9 | 303 | __sum16 csum = 0; |
422c346f PM |
304 | |
305 | rcu_read_lock(); | |
306 | afinfo = nf_get_afinfo(family); | |
307 | if (afinfo) | |
308 | csum = afinfo->checksum(skb, hook, dataoff, protocol); | |
309 | rcu_read_unlock(); | |
310 | return csum; | |
311 | } | |
312 | ||
d63a6507 PM |
313 | static inline __sum16 |
314 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, | |
315 | unsigned int dataoff, unsigned int len, | |
316 | u_int8_t protocol, unsigned short family) | |
317 | { | |
318 | const struct nf_afinfo *afinfo; | |
319 | __sum16 csum = 0; | |
320 | ||
321 | rcu_read_lock(); | |
322 | afinfo = nf_get_afinfo(family); | |
323 | if (afinfo) | |
324 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, | |
325 | protocol); | |
326 | rcu_read_unlock(); | |
327 | return csum; | |
328 | } | |
329 | ||
a0f4ecf3 JP |
330 | int nf_register_afinfo(const struct nf_afinfo *afinfo); |
331 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 332 | |
eb9c7ebe | 333 | #include <net/flow.h> |
c7232c99 | 334 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
eb9c7ebe PM |
335 | |
336 | static inline void | |
76108cea | 337 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 338 | { |
051578cc | 339 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
340 | void (*decodefn)(struct sk_buff *, struct flowi *); |
341 | ||
c7232c99 PM |
342 | rcu_read_lock(); |
343 | decodefn = rcu_dereference(nf_nat_decode_session_hook); | |
344 | if (decodefn) | |
345 | decodefn(skb, fl); | |
346 | rcu_read_unlock(); | |
eb9c7ebe PM |
347 | #endif |
348 | } | |
349 | ||
1da177e4 | 350 | #else /* !CONFIG_NETFILTER */ |
008027c3 AB |
351 | static inline int |
352 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
353 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
354 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), | |
355 | bool cond) | |
356 | { | |
357 | return okfn(net, sk, skb); | |
358 | } | |
359 | ||
360 | static inline int | |
361 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
362 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
363 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
364 | { | |
365 | return okfn(net, sk, skb); | |
366 | } | |
367 | ||
29a26a56 EB |
368 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
369 | struct sock *sk, struct sk_buff *skb, | |
370 | struct net_device *indev, struct net_device *outdev, | |
0c4b51f0 | 371 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
f53b61d8 | 372 | { |
9c92d348 | 373 | return 1; |
f53b61d8 | 374 | } |
f53b61d8 | 375 | struct flowi; |
eb9c7ebe | 376 | static inline void |
76108cea JE |
377 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
378 | { | |
379 | } | |
1da177e4 LT |
380 | #endif /*CONFIG_NETFILTER*/ |
381 | ||
5f79e0f9 | 382 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
62da9865 DB |
383 | #include <linux/netfilter/nf_conntrack_zones_common.h> |
384 | ||
312a0c16 | 385 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 386 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
0e60ebe0 | 387 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
b7bd1809 PNA |
388 | #else |
389 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
390 | #endif | |
9cb01766 PNA |
391 | |
392 | struct nf_conn; | |
41d73ec0 | 393 | enum ip_conntrack_info; |
9cb01766 PNA |
394 | struct nlattr; |
395 | ||
a4b4766c | 396 | struct nfnl_ct_hook { |
224a0597 | 397 | struct nf_conn *(*get_ct)(const struct sk_buff *skb, |
b7bd1809 | 398 | enum ip_conntrack_info *ctinfo); |
9cb01766 | 399 | size_t (*build_size)(const struct nf_conn *ct); |
b7bd1809 PNA |
400 | int (*build)(struct sk_buff *skb, struct nf_conn *ct, |
401 | enum ip_conntrack_info ctinfo, | |
402 | u_int16_t ct_attr, u_int16_t ct_info_attr); | |
9cb01766 | 403 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); |
bd077937 PNA |
404 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
405 | u32 portid, u32 report); | |
8c88f87c | 406 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 407 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 408 | }; |
a4b4766c | 409 | extern struct nfnl_ct_hook __rcu *nfnl_ct_hook; |
5f79e0f9 | 410 | |
e7c8899f FW |
411 | /** |
412 | * nf_skb_duplicated - TEE target has sent a packet | |
413 | * | |
414 | * When a xtables target sends a packet, the OUTPUT and POSTROUTING | |
415 | * hooks are traversed again, i.e. nft and xtables are invoked recursively. | |
416 | * | |
417 | * This is used by xtables TEE target to prevent the duplicated skb from | |
418 | * being duplicated again. | |
419 | */ | |
420 | DECLARE_PER_CPU(bool, nf_skb_duplicated); | |
421 | ||
1da177e4 | 422 | #endif /*__LINUX_NETFILTER_H*/ |