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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 { | |
e3b37f11 AC |
64 | /* User fills in from here down. */ |
65 | nf_hookfn *hook; | |
66 | struct net_device *dev; | |
67 | void *priv; | |
68 | u_int8_t pf; | |
69 | unsigned int hooknum; | |
70 | /* Hooks are ordered in ascending priority. */ | |
71 | int priority; | |
72 | }; | |
73 | ||
74 | struct nf_hook_entry { | |
d415b9eb AC |
75 | nf_hookfn *hook; |
76 | void *priv; | |
e3b37f11 AC |
77 | }; |
78 | ||
960632ec AC |
79 | struct nf_hook_entries { |
80 | u16 num_hook_entries; | |
81 | /* padding */ | |
82 | struct nf_hook_entry hooks[]; | |
83 | ||
84 | /* trailer: pointers to original orig_ops of each hook. | |
85 | * | |
86 | * This is not part of struct nf_hook_entry since its only | |
87 | * needed in slow path (hook register/unregister). | |
88 | * | |
89 | * const struct nf_hook_ops *orig_ops[] | |
90 | */ | |
91 | }; | |
0aa8c57a | 92 | |
960632ec | 93 | static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e) |
0aa8c57a | 94 | { |
960632ec AC |
95 | unsigned int n = e->num_hook_entries; |
96 | const void *hook_end; | |
97 | ||
98 | hook_end = &e->hooks[n]; /* this is *past* ->hooks[]! */ | |
99 | ||
100 | return (struct nf_hook_ops **)hook_end; | |
0aa8c57a AC |
101 | } |
102 | ||
103 | static inline int | |
104 | nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb, | |
105 | struct nf_hook_state *state) | |
106 | { | |
d415b9eb | 107 | return entry->hook(entry->priv, skb, state); |
0aa8c57a AC |
108 | } |
109 | ||
107a9f4d DM |
110 | static inline void nf_hook_state_init(struct nf_hook_state *p, |
111 | unsigned int hook, | |
1610a73c | 112 | u_int8_t pf, |
107a9f4d DM |
113 | struct net_device *indev, |
114 | struct net_device *outdev, | |
1c984f8a | 115 | struct sock *sk, |
b11b1f65 | 116 | struct net *net, |
0c4b51f0 | 117 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
107a9f4d DM |
118 | { |
119 | p->hook = hook; | |
107a9f4d DM |
120 | p->pf = pf; |
121 | p->in = indev; | |
122 | p->out = outdev; | |
1c984f8a | 123 | p->sk = sk; |
b11b1f65 | 124 | p->net = net; |
107a9f4d DM |
125 | p->okfn = okfn; |
126 | } | |
127 | ||
1da177e4 | 128 | |
1da177e4 | 129 | |
d94d9fee | 130 | struct nf_sockopt_ops { |
1da177e4 LT |
131 | struct list_head list; |
132 | ||
76108cea | 133 | u_int8_t pf; |
1da177e4 LT |
134 | |
135 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
136 | int set_optmin; | |
137 | int set_optmax; | |
138 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
c30f540b | 139 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
140 | int (*compat_set)(struct sock *sk, int optval, |
141 | void __user *user, unsigned int len); | |
c30f540b | 142 | #endif |
1da177e4 LT |
143 | int get_optmin; |
144 | int get_optmax; | |
145 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 146 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
147 | int (*compat_get)(struct sock *sk, int optval, |
148 | void __user *user, int *len); | |
c30f540b | 149 | #endif |
16fcec35 NH |
150 | /* Use the module struct to lock set/get code in place */ |
151 | struct module *owner; | |
1da177e4 LT |
152 | }; |
153 | ||
1da177e4 | 154 | /* Function to register/unregister hook points. */ |
085db2c0 EB |
155 | int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops); |
156 | void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops); | |
157 | int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg, | |
158 | unsigned int n); | |
159 | void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg, | |
160 | unsigned int n); | |
161 | ||
1da177e4 LT |
162 | /* Functions to register get/setsockopt ranges (non-inclusive). You |
163 | need to check permissions yourself! */ | |
164 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
165 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
166 | ||
d1c85c2e | 167 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 168 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
a2d7ec58 ED |
169 | #endif |
170 | ||
01886bd9 | 171 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state, |
960632ec | 172 | const struct nf_hook_entries *e, unsigned int i); |
16a6677f PM |
173 | |
174 | /** | |
1610a73c | 175 | * nf_hook - call a netfilter hook |
b8d0aad0 | 176 | * |
16a6677f PM |
177 | * Returns 1 if the hook has allowed the packet to pass. The function |
178 | * okfn must be invoked by the caller in this case. Any other return | |
179 | * value indicates the packet has been consumed by the hook. | |
180 | */ | |
1610a73c PNA |
181 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
182 | struct sock *sk, struct sk_buff *skb, | |
183 | struct net_device *indev, struct net_device *outdev, | |
184 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
16a6677f | 185 | { |
960632ec | 186 | struct nf_hook_entries *hook_head; |
e3b37f11 | 187 | int ret = 1; |
af4610c3 FW |
188 | |
189 | #ifdef HAVE_JUMP_LABEL | |
190 | if (__builtin_constant_p(pf) && | |
191 | __builtin_constant_p(hook) && | |
192 | !static_key_false(&nf_hooks_needed[pf][hook])) | |
193 | return 1; | |
194 | #endif | |
195 | ||
e3b37f11 AC |
196 | rcu_read_lock(); |
197 | hook_head = rcu_dereference(net->nf.hooks[pf][hook]); | |
198 | if (hook_head) { | |
107a9f4d | 199 | struct nf_hook_state state; |
cfdfab31 | 200 | |
01886bd9 | 201 | nf_hook_state_init(&state, hook, pf, indev, outdev, |
1610a73c | 202 | sk, net, okfn); |
fe72926b | 203 | |
960632ec | 204 | ret = nf_hook_slow(skb, &state, hook_head, 0); |
cfdfab31 | 205 | } |
e3b37f11 AC |
206 | rcu_read_unlock(); |
207 | ||
208 | return ret; | |
16a6677f PM |
209 | } |
210 | ||
1da177e4 LT |
211 | /* Activate hook; either okfn or kfree_skb called, unless a hook |
212 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
213 | the consequences). | |
214 | ||
215 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
216 | accepted. | |
217 | */ | |
218 | ||
219 | /* RR: | |
220 | > I don't want nf_hook to return anything because people might forget | |
221 | > about async and trust the return value to mean "packet was ok". | |
222 | ||
223 | AK: | |
224 | Just document it clearly, then you can expect some sense from kernel | |
225 | coders :) | |
226 | */ | |
227 | ||
2249065f | 228 | static inline int |
29a26a56 | 229 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
7026b1dd | 230 | struct sk_buff *skb, struct net_device *in, struct net_device *out, |
0c4b51f0 EB |
231 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), |
232 | bool cond) | |
2249065f | 233 | { |
4bac6b18 PM |
234 | int ret; |
235 | ||
236 | if (!cond || | |
1610a73c | 237 | ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1)) |
0c4b51f0 | 238 | ret = okfn(net, sk, skb); |
2249065f JE |
239 | return ret; |
240 | } | |
1da177e4 | 241 | |
2249065f | 242 | static inline int |
29a26a56 | 243 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, |
2249065f | 244 | struct net_device *in, struct net_device *out, |
0c4b51f0 | 245 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
2249065f | 246 | { |
1610a73c PNA |
247 | int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn); |
248 | if (ret == 1) | |
249 | ret = okfn(net, sk, skb); | |
250 | return ret; | |
2249065f | 251 | } |
1da177e4 LT |
252 | |
253 | /* Call setsockopt() */ | |
76108cea | 254 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 255 | unsigned int len); |
76108cea | 256 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 257 | int *len); |
c30f540b | 258 | #ifdef CONFIG_COMPAT |
76108cea | 259 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 260 | char __user *opt, unsigned int len); |
76108cea | 261 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 262 | char __user *opt, int *len); |
c30f540b | 263 | #endif |
3fdadf7d | 264 | |
089af26c HW |
265 | /* Call this before modifying an existing packet: ensures it is |
266 | modifiable and linear to the point you care about (writable_len). | |
267 | Returns true or false. */ | |
a0f4ecf3 | 268 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 269 | |
1841a4c7 | 270 | struct flowi; |
02f014d8 | 271 | struct nf_queue_entry; |
c01cd429 | 272 | |
bce8032e PM |
273 | struct nf_afinfo { |
274 | unsigned short family; | |
b51655b9 | 275 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 276 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
277 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
278 | unsigned int hook, | |
279 | unsigned int dataoff, | |
280 | unsigned int len, | |
281 | u_int8_t protocol); | |
31ad3dd6 | 282 | int (*route)(struct net *net, struct dst_entry **dst, |
0fae2e77 | 283 | struct flowi *fl, bool strict); |
bce8032e | 284 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 285 | struct nf_queue_entry *entry); |
d815d90b | 286 | int (*reroute)(struct net *net, struct sk_buff *skb, |
02f014d8 | 287 | const struct nf_queue_entry *entry); |
bce8032e | 288 | int route_key_size; |
2cc7d573 HW |
289 | }; |
290 | ||
0e60ebe0 | 291 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
1e796fda | 292 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
bce8032e PM |
293 | { |
294 | return rcu_dereference(nf_afinfo[family]); | |
295 | } | |
2cc7d573 | 296 | |
b51655b9 | 297 | static inline __sum16 |
422c346f PM |
298 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
299 | u_int8_t protocol, unsigned short family) | |
300 | { | |
1e796fda | 301 | const struct nf_afinfo *afinfo; |
b51655b9 | 302 | __sum16 csum = 0; |
422c346f PM |
303 | |
304 | rcu_read_lock(); | |
305 | afinfo = nf_get_afinfo(family); | |
306 | if (afinfo) | |
307 | csum = afinfo->checksum(skb, hook, dataoff, protocol); | |
308 | rcu_read_unlock(); | |
309 | return csum; | |
310 | } | |
311 | ||
d63a6507 PM |
312 | static inline __sum16 |
313 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, | |
314 | unsigned int dataoff, unsigned int len, | |
315 | u_int8_t protocol, unsigned short family) | |
316 | { | |
317 | const struct nf_afinfo *afinfo; | |
318 | __sum16 csum = 0; | |
319 | ||
320 | rcu_read_lock(); | |
321 | afinfo = nf_get_afinfo(family); | |
322 | if (afinfo) | |
323 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, | |
324 | protocol); | |
325 | rcu_read_unlock(); | |
326 | return csum; | |
327 | } | |
328 | ||
a0f4ecf3 JP |
329 | int nf_register_afinfo(const struct nf_afinfo *afinfo); |
330 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 331 | |
eb9c7ebe | 332 | #include <net/flow.h> |
c7232c99 | 333 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
eb9c7ebe PM |
334 | |
335 | static inline void | |
76108cea | 336 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 337 | { |
051578cc | 338 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
339 | void (*decodefn)(struct sk_buff *, struct flowi *); |
340 | ||
c7232c99 PM |
341 | rcu_read_lock(); |
342 | decodefn = rcu_dereference(nf_nat_decode_session_hook); | |
343 | if (decodefn) | |
344 | decodefn(skb, fl); | |
345 | rcu_read_unlock(); | |
eb9c7ebe PM |
346 | #endif |
347 | } | |
348 | ||
1da177e4 | 349 | #else /* !CONFIG_NETFILTER */ |
008027c3 AB |
350 | static inline int |
351 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
352 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
353 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), | |
354 | bool cond) | |
355 | { | |
356 | return okfn(net, sk, skb); | |
357 | } | |
358 | ||
359 | static inline int | |
360 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, | |
361 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
362 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) | |
363 | { | |
364 | return okfn(net, sk, skb); | |
365 | } | |
366 | ||
29a26a56 EB |
367 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
368 | struct sock *sk, struct sk_buff *skb, | |
369 | struct net_device *indev, struct net_device *outdev, | |
0c4b51f0 | 370 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
f53b61d8 | 371 | { |
9c92d348 | 372 | return 1; |
f53b61d8 | 373 | } |
f53b61d8 | 374 | struct flowi; |
eb9c7ebe | 375 | static inline void |
76108cea JE |
376 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
377 | { | |
378 | } | |
1da177e4 LT |
379 | #endif /*CONFIG_NETFILTER*/ |
380 | ||
5f79e0f9 | 381 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
62da9865 DB |
382 | #include <linux/netfilter/nf_conntrack_zones_common.h> |
383 | ||
312a0c16 | 384 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 385 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
0e60ebe0 | 386 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
b7bd1809 PNA |
387 | #else |
388 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
389 | #endif | |
9cb01766 PNA |
390 | |
391 | struct nf_conn; | |
41d73ec0 | 392 | enum ip_conntrack_info; |
9cb01766 PNA |
393 | struct nlattr; |
394 | ||
a4b4766c | 395 | struct nfnl_ct_hook { |
224a0597 | 396 | struct nf_conn *(*get_ct)(const struct sk_buff *skb, |
b7bd1809 | 397 | enum ip_conntrack_info *ctinfo); |
9cb01766 | 398 | size_t (*build_size)(const struct nf_conn *ct); |
b7bd1809 PNA |
399 | int (*build)(struct sk_buff *skb, struct nf_conn *ct, |
400 | enum ip_conntrack_info ctinfo, | |
401 | u_int16_t ct_attr, u_int16_t ct_info_attr); | |
9cb01766 | 402 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); |
bd077937 PNA |
403 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
404 | u32 portid, u32 report); | |
8c88f87c | 405 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 406 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 407 | }; |
a4b4766c | 408 | extern struct nfnl_ct_hook __rcu *nfnl_ct_hook; |
5f79e0f9 | 409 | |
e7c8899f FW |
410 | /** |
411 | * nf_skb_duplicated - TEE target has sent a packet | |
412 | * | |
413 | * When a xtables target sends a packet, the OUTPUT and POSTROUTING | |
414 | * hooks are traversed again, i.e. nft and xtables are invoked recursively. | |
415 | * | |
416 | * This is used by xtables TEE target to prevent the duplicated skb from | |
417 | * being duplicated again. | |
418 | */ | |
419 | DECLARE_PER_CPU(bool, nf_skb_duplicated); | |
420 | ||
1da177e4 | 421 | #endif /*__LINUX_NETFILTER_H*/ |