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Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef __LINUX_NETFILTER_H |
2 | #define __LINUX_NETFILTER_H | |
3 | ||
1da177e4 | 4 | #include <linux/init.h> |
1da177e4 LT |
5 | #include <linux/skbuff.h> |
6 | #include <linux/net.h> | |
7 | #include <linux/if.h> | |
2e3075a2 JE |
8 | #include <linux/in.h> |
9 | #include <linux/in6.h> | |
1da177e4 LT |
10 | #include <linux/wait.h> |
11 | #include <linux/list.h> | |
d1c85c2e | 12 | #include <linux/static_key.h> |
a263653e | 13 | #include <linux/netfilter_defs.h> |
085db2c0 EB |
14 | #include <linux/netdevice.h> |
15 | #include <net/net_namespace.h> | |
a263653e | 16 | |
1da177e4 | 17 | #ifdef CONFIG_NETFILTER |
f615df76 FW |
18 | static inline int NF_DROP_GETERR(int verdict) |
19 | { | |
20 | return -(verdict >> NF_VERDICT_QBITS); | |
21 | } | |
1da177e4 | 22 | |
b8beedd2 PM |
23 | static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
24 | const union nf_inet_addr *a2) | |
25 | { | |
26 | return a1->all[0] == a2->all[0] && | |
27 | a1->all[1] == a2->all[1] && | |
28 | a1->all[2] == a2->all[2] && | |
29 | a1->all[3] == a2->all[3]; | |
30 | } | |
31 | ||
efdedd54 DF |
32 | static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, |
33 | union nf_inet_addr *result, | |
34 | const union nf_inet_addr *mask) | |
35 | { | |
36 | result->all[0] = a1->all[0] & mask->all[0]; | |
37 | result->all[1] = a1->all[1] & mask->all[1]; | |
38 | result->all[2] = a1->all[2] & mask->all[2]; | |
39 | result->all[3] = a1->all[3] & mask->all[3]; | |
40 | } | |
41 | ||
a0f4ecf3 | 42 | int netfilter_init(void); |
1da177e4 | 43 | |
1da177e4 | 44 | struct sk_buff; |
1da177e4 | 45 | |
795aa6ef | 46 | struct nf_hook_ops; |
cfdfab31 | 47 | |
1c984f8a DM |
48 | struct sock; |
49 | ||
cfdfab31 DM |
50 | struct nf_hook_state { |
51 | unsigned int hook; | |
cfdfab31 DM |
52 | u_int8_t pf; |
53 | struct net_device *in; | |
54 | struct net_device *out; | |
1c984f8a | 55 | struct sock *sk; |
b11b1f65 | 56 | struct net *net; |
0c4b51f0 | 57 | int (*okfn)(struct net *, struct sock *, struct sk_buff *); |
cfdfab31 DM |
58 | }; |
59 | ||
e3b37f11 AC |
60 | typedef unsigned int nf_hookfn(void *priv, |
61 | struct sk_buff *skb, | |
62 | const struct nf_hook_state *state); | |
63 | struct nf_hook_ops { | |
64 | struct list_head list; | |
65 | ||
66 | /* User fills in from here down. */ | |
67 | nf_hookfn *hook; | |
68 | struct net_device *dev; | |
69 | void *priv; | |
70 | u_int8_t pf; | |
71 | unsigned int hooknum; | |
72 | /* Hooks are ordered in ascending priority. */ | |
73 | int priority; | |
74 | }; | |
75 | ||
76 | struct nf_hook_entry { | |
77 | struct nf_hook_entry __rcu *next; | |
d415b9eb AC |
78 | nf_hookfn *hook; |
79 | void *priv; | |
e3b37f11 AC |
80 | const struct nf_hook_ops *orig_ops; |
81 | }; | |
82 | ||
0aa8c57a AC |
83 | static inline void |
84 | nf_hook_entry_init(struct nf_hook_entry *entry, const struct nf_hook_ops *ops) | |
85 | { | |
86 | entry->next = NULL; | |
d415b9eb AC |
87 | entry->hook = ops->hook; |
88 | entry->priv = ops->priv; | |
0aa8c57a AC |
89 | entry->orig_ops = ops; |
90 | } | |
91 | ||
92 | static inline int | |
93 | nf_hook_entry_priority(const struct nf_hook_entry *entry) | |
94 | { | |
d415b9eb | 95 | return entry->orig_ops->priority; |
0aa8c57a AC |
96 | } |
97 | ||
98 | static inline int | |
99 | nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb, | |
100 | struct nf_hook_state *state) | |
101 | { | |
d415b9eb | 102 | return entry->hook(entry->priv, skb, state); |
0aa8c57a AC |
103 | } |
104 | ||
105 | static inline const struct nf_hook_ops * | |
106 | nf_hook_entry_ops(const struct nf_hook_entry *entry) | |
107 | { | |
108 | return entry->orig_ops; | |
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 | int nf_register_hook(struct nf_hook_ops *reg); |
164 | void nf_unregister_hook(struct nf_hook_ops *reg); | |
972d1cb1 PM |
165 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
166 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); | |
e8bffe0c MB |
167 | int _nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
168 | void _nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); | |
1da177e4 LT |
169 | |
170 | /* Functions to register get/setsockopt ranges (non-inclusive). You | |
171 | need to check permissions yourself! */ | |
172 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
173 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
174 | ||
d1c85c2e | 175 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 176 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
a2d7ec58 ED |
177 | #endif |
178 | ||
01886bd9 PNA |
179 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state, |
180 | struct nf_hook_entry *entry); | |
16a6677f PM |
181 | |
182 | /** | |
1610a73c | 183 | * nf_hook - call a netfilter hook |
b8d0aad0 | 184 | * |
16a6677f PM |
185 | * Returns 1 if the hook has allowed the packet to pass. The function |
186 | * okfn must be invoked by the caller in this case. Any other return | |
187 | * value indicates the packet has been consumed by the hook. | |
188 | */ | |
1610a73c PNA |
189 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
190 | struct sock *sk, struct sk_buff *skb, | |
191 | struct net_device *indev, struct net_device *outdev, | |
192 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
16a6677f | 193 | { |
e3b37f11 AC |
194 | struct nf_hook_entry *hook_head; |
195 | int ret = 1; | |
af4610c3 FW |
196 | |
197 | #ifdef HAVE_JUMP_LABEL | |
198 | if (__builtin_constant_p(pf) && | |
199 | __builtin_constant_p(hook) && | |
200 | !static_key_false(&nf_hooks_needed[pf][hook])) | |
201 | return 1; | |
202 | #endif | |
203 | ||
e3b37f11 AC |
204 | rcu_read_lock(); |
205 | hook_head = rcu_dereference(net->nf.hooks[pf][hook]); | |
206 | if (hook_head) { | |
107a9f4d | 207 | struct nf_hook_state state; |
cfdfab31 | 208 | |
01886bd9 | 209 | nf_hook_state_init(&state, hook, pf, indev, outdev, |
1610a73c | 210 | sk, net, okfn); |
fe72926b | 211 | |
01886bd9 | 212 | ret = nf_hook_slow(skb, &state, hook_head); |
cfdfab31 | 213 | } |
e3b37f11 AC |
214 | rcu_read_unlock(); |
215 | ||
216 | return ret; | |
16a6677f PM |
217 | } |
218 | ||
1da177e4 LT |
219 | /* Activate hook; either okfn or kfree_skb called, unless a hook |
220 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
221 | the consequences). | |
222 | ||
223 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
224 | accepted. | |
225 | */ | |
226 | ||
227 | /* RR: | |
228 | > I don't want nf_hook to return anything because people might forget | |
229 | > about async and trust the return value to mean "packet was ok". | |
230 | ||
231 | AK: | |
232 | Just document it clearly, then you can expect some sense from kernel | |
233 | coders :) | |
234 | */ | |
235 | ||
2249065f | 236 | static inline int |
29a26a56 | 237 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
7026b1dd | 238 | struct sk_buff *skb, struct net_device *in, struct net_device *out, |
0c4b51f0 EB |
239 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), |
240 | bool cond) | |
2249065f | 241 | { |
4bac6b18 PM |
242 | int ret; |
243 | ||
244 | if (!cond || | |
1610a73c | 245 | ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1)) |
0c4b51f0 | 246 | ret = okfn(net, sk, skb); |
2249065f JE |
247 | return ret; |
248 | } | |
1da177e4 | 249 | |
2249065f | 250 | static inline int |
29a26a56 | 251 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, |
2249065f | 252 | struct net_device *in, struct net_device *out, |
0c4b51f0 | 253 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
2249065f | 254 | { |
1610a73c PNA |
255 | int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn); |
256 | if (ret == 1) | |
257 | ret = okfn(net, sk, skb); | |
258 | return ret; | |
2249065f | 259 | } |
1da177e4 LT |
260 | |
261 | /* Call setsockopt() */ | |
76108cea | 262 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 263 | unsigned int len); |
76108cea | 264 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 265 | int *len); |
c30f540b | 266 | #ifdef CONFIG_COMPAT |
76108cea | 267 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 268 | char __user *opt, unsigned int len); |
76108cea | 269 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 270 | char __user *opt, int *len); |
c30f540b | 271 | #endif |
3fdadf7d | 272 | |
089af26c HW |
273 | /* Call this before modifying an existing packet: ensures it is |
274 | modifiable and linear to the point you care about (writable_len). | |
275 | Returns true or false. */ | |
a0f4ecf3 | 276 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 277 | |
1841a4c7 | 278 | struct flowi; |
02f014d8 | 279 | struct nf_queue_entry; |
c01cd429 | 280 | |
bce8032e PM |
281 | struct nf_afinfo { |
282 | unsigned short family; | |
b51655b9 | 283 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 284 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
285 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
286 | unsigned int hook, | |
287 | unsigned int dataoff, | |
288 | unsigned int len, | |
289 | u_int8_t protocol); | |
31ad3dd6 | 290 | int (*route)(struct net *net, struct dst_entry **dst, |
0fae2e77 | 291 | struct flowi *fl, bool strict); |
bce8032e | 292 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 293 | struct nf_queue_entry *entry); |
d815d90b | 294 | int (*reroute)(struct net *net, struct sk_buff *skb, |
02f014d8 | 295 | const struct nf_queue_entry *entry); |
bce8032e | 296 | int route_key_size; |
2cc7d573 HW |
297 | }; |
298 | ||
0e60ebe0 | 299 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
1e796fda | 300 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
bce8032e PM |
301 | { |
302 | return rcu_dereference(nf_afinfo[family]); | |
303 | } | |
2cc7d573 | 304 | |
b51655b9 | 305 | static inline __sum16 |
422c346f PM |
306 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
307 | u_int8_t protocol, unsigned short family) | |
308 | { | |
1e796fda | 309 | const struct nf_afinfo *afinfo; |
b51655b9 | 310 | __sum16 csum = 0; |
422c346f PM |
311 | |
312 | rcu_read_lock(); | |
313 | afinfo = nf_get_afinfo(family); | |
314 | if (afinfo) | |
315 | csum = afinfo->checksum(skb, hook, dataoff, protocol); | |
316 | rcu_read_unlock(); | |
317 | return csum; | |
318 | } | |
319 | ||
d63a6507 PM |
320 | static inline __sum16 |
321 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, | |
322 | unsigned int dataoff, unsigned int len, | |
323 | u_int8_t protocol, unsigned short family) | |
324 | { | |
325 | const struct nf_afinfo *afinfo; | |
326 | __sum16 csum = 0; | |
327 | ||
328 | rcu_read_lock(); | |
329 | afinfo = nf_get_afinfo(family); | |
330 | if (afinfo) | |
331 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, | |
332 | protocol); | |
333 | rcu_read_unlock(); | |
334 | return csum; | |
335 | } | |
336 | ||
a0f4ecf3 JP |
337 | int nf_register_afinfo(const struct nf_afinfo *afinfo); |
338 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 339 | |
eb9c7ebe | 340 | #include <net/flow.h> |
c7232c99 | 341 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
eb9c7ebe PM |
342 | |
343 | static inline void | |
76108cea | 344 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 345 | { |
051578cc | 346 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
347 | void (*decodefn)(struct sk_buff *, struct flowi *); |
348 | ||
c7232c99 PM |
349 | rcu_read_lock(); |
350 | decodefn = rcu_dereference(nf_nat_decode_session_hook); | |
351 | if (decodefn) | |
352 | decodefn(skb, fl); | |
353 | rcu_read_unlock(); | |
eb9c7ebe PM |
354 | #endif |
355 | } | |
356 | ||
1da177e4 | 357 | #else /* !CONFIG_NETFILTER */ |
008027c3 AB |
358 | static inline int |
359 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
360 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
361 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), | |
362 | bool cond) | |
363 | { | |
364 | return okfn(net, sk, skb); | |
365 | } | |
366 | ||
367 | static inline int | |
368 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
369 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
370 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
371 | { | |
372 | return okfn(net, sk, skb); | |
373 | } | |
374 | ||
29a26a56 EB |
375 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
376 | struct sock *sk, struct sk_buff *skb, | |
377 | struct net_device *indev, struct net_device *outdev, | |
0c4b51f0 | 378 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
f53b61d8 | 379 | { |
9c92d348 | 380 | return 1; |
f53b61d8 | 381 | } |
f53b61d8 | 382 | struct flowi; |
eb9c7ebe | 383 | static inline void |
76108cea JE |
384 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
385 | { | |
386 | } | |
1da177e4 LT |
387 | #endif /*CONFIG_NETFILTER*/ |
388 | ||
5f79e0f9 | 389 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
62da9865 DB |
390 | #include <linux/netfilter/nf_conntrack_zones_common.h> |
391 | ||
312a0c16 | 392 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 393 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
0e60ebe0 | 394 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
b7bd1809 PNA |
395 | #else |
396 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
397 | #endif | |
9cb01766 PNA |
398 | |
399 | struct nf_conn; | |
41d73ec0 | 400 | enum ip_conntrack_info; |
9cb01766 PNA |
401 | struct nlattr; |
402 | ||
a4b4766c | 403 | struct nfnl_ct_hook { |
224a0597 | 404 | struct nf_conn *(*get_ct)(const struct sk_buff *skb, |
b7bd1809 | 405 | enum ip_conntrack_info *ctinfo); |
9cb01766 | 406 | size_t (*build_size)(const struct nf_conn *ct); |
b7bd1809 PNA |
407 | int (*build)(struct sk_buff *skb, struct nf_conn *ct, |
408 | enum ip_conntrack_info ctinfo, | |
409 | u_int16_t ct_attr, u_int16_t ct_info_attr); | |
9cb01766 | 410 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); |
bd077937 PNA |
411 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
412 | u32 portid, u32 report); | |
8c88f87c | 413 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 414 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 415 | }; |
a4b4766c | 416 | extern struct nfnl_ct_hook __rcu *nfnl_ct_hook; |
5f79e0f9 | 417 | |
e7c8899f FW |
418 | /** |
419 | * nf_skb_duplicated - TEE target has sent a packet | |
420 | * | |
421 | * When a xtables target sends a packet, the OUTPUT and POSTROUTING | |
422 | * hooks are traversed again, i.e. nft and xtables are invoked recursively. | |
423 | * | |
424 | * This is used by xtables TEE target to prevent the duplicated skb from | |
425 | * being duplicated again. | |
426 | */ | |
427 | DECLARE_PER_CPU(bool, nf_skb_duplicated); | |
428 | ||
1da177e4 | 429 | #endif /*__LINUX_NETFILTER_H*/ |