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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; | |
52 | int thresh; | |
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; |
f7191483 | 58 | struct list_head *hook_list; |
0c4b51f0 | 59 | int (*okfn)(struct net *, struct sock *, struct sk_buff *); |
cfdfab31 DM |
60 | }; |
61 | ||
107a9f4d | 62 | static inline void nf_hook_state_init(struct nf_hook_state *p, |
f7191483 | 63 | struct list_head *hook_list, |
107a9f4d DM |
64 | unsigned int hook, |
65 | int thresh, u_int8_t pf, | |
66 | struct net_device *indev, | |
67 | struct net_device *outdev, | |
1c984f8a | 68 | struct sock *sk, |
b11b1f65 | 69 | struct net *net, |
0c4b51f0 | 70 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
107a9f4d DM |
71 | { |
72 | p->hook = hook; | |
73 | p->thresh = thresh; | |
74 | p->pf = pf; | |
75 | p->in = indev; | |
76 | p->out = outdev; | |
1c984f8a | 77 | p->sk = sk; |
b11b1f65 | 78 | p->net = net; |
f7191483 | 79 | p->hook_list = hook_list; |
107a9f4d DM |
80 | p->okfn = okfn; |
81 | } | |
82 | ||
795aa6ef | 83 | typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops, |
3db05fea | 84 | struct sk_buff *skb, |
238e54c9 | 85 | const struct nf_hook_state *state); |
1da177e4 | 86 | |
d94d9fee | 87 | struct nf_hook_ops { |
87d5c18c | 88 | struct list_head list; |
1da177e4 LT |
89 | |
90 | /* User fills in from here down. */ | |
87d5c18c | 91 | nf_hookfn *hook; |
e687ad60 | 92 | struct net_device *dev; |
87d5c18c PN |
93 | struct module *owner; |
94 | void *priv; | |
95 | u_int8_t pf; | |
96 | unsigned int hooknum; | |
1da177e4 | 97 | /* Hooks are ordered in ascending priority. */ |
87d5c18c | 98 | int priority; |
1da177e4 LT |
99 | }; |
100 | ||
d94d9fee | 101 | struct nf_sockopt_ops { |
1da177e4 LT |
102 | struct list_head list; |
103 | ||
76108cea | 104 | u_int8_t pf; |
1da177e4 LT |
105 | |
106 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
107 | int set_optmin; | |
108 | int set_optmax; | |
109 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
c30f540b | 110 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
111 | int (*compat_set)(struct sock *sk, int optval, |
112 | void __user *user, unsigned int len); | |
c30f540b | 113 | #endif |
1da177e4 LT |
114 | int get_optmin; |
115 | int get_optmax; | |
116 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 117 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
118 | int (*compat_get)(struct sock *sk, int optval, |
119 | void __user *user, int *len); | |
c30f540b | 120 | #endif |
16fcec35 NH |
121 | /* Use the module struct to lock set/get code in place */ |
122 | struct module *owner; | |
1da177e4 LT |
123 | }; |
124 | ||
1da177e4 | 125 | /* Function to register/unregister hook points. */ |
085db2c0 EB |
126 | int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops); |
127 | void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops); | |
128 | int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg, | |
129 | unsigned int n); | |
130 | void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg, | |
131 | unsigned int n); | |
132 | ||
1da177e4 LT |
133 | int nf_register_hook(struct nf_hook_ops *reg); |
134 | void nf_unregister_hook(struct nf_hook_ops *reg); | |
972d1cb1 PM |
135 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
136 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); | |
1da177e4 LT |
137 | |
138 | /* Functions to register get/setsockopt ranges (non-inclusive). You | |
139 | need to check permissions yourself! */ | |
140 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
141 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
142 | ||
d1c85c2e | 143 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 144 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
d1c85c2e | 145 | |
3bbd14e0 | 146 | static inline bool nf_hook_list_active(struct list_head *hook_list, |
b8d0aad0 | 147 | u_int8_t pf, unsigned int hook) |
a2d7ec58 ED |
148 | { |
149 | if (__builtin_constant_p(pf) && | |
150 | __builtin_constant_p(hook)) | |
c5905afb | 151 | return static_key_false(&nf_hooks_needed[pf][hook]); |
a2d7ec58 | 152 | |
3bbd14e0 | 153 | return !list_empty(hook_list); |
a2d7ec58 ED |
154 | } |
155 | #else | |
3bbd14e0 | 156 | static inline bool nf_hook_list_active(struct list_head *hook_list, |
b8d0aad0 | 157 | u_int8_t pf, unsigned int hook) |
a2d7ec58 | 158 | { |
3bbd14e0 | 159 | return !list_empty(hook_list); |
a2d7ec58 ED |
160 | } |
161 | #endif | |
162 | ||
cfdfab31 | 163 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state); |
16a6677f PM |
164 | |
165 | /** | |
166 | * nf_hook_thresh - call a netfilter hook | |
b8d0aad0 | 167 | * |
16a6677f PM |
168 | * Returns 1 if the hook has allowed the packet to pass. The function |
169 | * okfn must be invoked by the caller in this case. Any other return | |
170 | * value indicates the packet has been consumed by the hook. | |
171 | */ | |
76108cea | 172 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
7a773504 | 173 | struct net *net, |
7026b1dd | 174 | struct sock *sk, |
3db05fea | 175 | struct sk_buff *skb, |
16a6677f PM |
176 | struct net_device *indev, |
177 | struct net_device *outdev, | |
0c4b51f0 | 178 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), |
7026b1dd | 179 | int thresh) |
16a6677f | 180 | { |
3bbd14e0 | 181 | struct list_head *hook_list = &net->nf.hooks[pf][hook]; |
70aa9966 | 182 | |
3bbd14e0 | 183 | if (nf_hook_list_active(hook_list, pf, hook)) { |
107a9f4d | 184 | struct nf_hook_state state; |
cfdfab31 | 185 | |
3bbd14e0 | 186 | nf_hook_state_init(&state, hook_list, hook, thresh, |
b11b1f65 | 187 | pf, indev, outdev, sk, net, okfn); |
cfdfab31 DM |
188 | return nf_hook_slow(skb, &state); |
189 | } | |
a2d7ec58 | 190 | return 1; |
16a6677f PM |
191 | } |
192 | ||
29a26a56 EB |
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, | |
0c4b51f0 | 196 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
16a6677f | 197 | { |
7a773504 | 198 | return nf_hook_thresh(pf, hook, net, sk, skb, indev, outdev, okfn, INT_MIN); |
16a6677f | 199 | } |
1da177e4 LT |
200 | |
201 | /* Activate hook; either okfn or kfree_skb called, unless a hook | |
202 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
203 | the consequences). | |
204 | ||
205 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
206 | accepted. | |
207 | */ | |
208 | ||
209 | /* RR: | |
210 | > I don't want nf_hook to return anything because people might forget | |
211 | > about async and trust the return value to mean "packet was ok". | |
212 | ||
213 | AK: | |
214 | Just document it clearly, then you can expect some sense from kernel | |
215 | coders :) | |
216 | */ | |
217 | ||
2249065f | 218 | static inline int |
29a26a56 | 219 | NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
7026b1dd DM |
220 | struct sk_buff *skb, struct net_device *in, |
221 | struct net_device *out, | |
0c4b51f0 EB |
222 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), |
223 | int thresh) | |
2249065f | 224 | { |
7a773504 | 225 | int ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, thresh); |
2249065f | 226 | if (ret == 1) |
0c4b51f0 | 227 | ret = okfn(net, sk, skb); |
2249065f JE |
228 | return ret; |
229 | } | |
48d5cad8 | 230 | |
2249065f | 231 | static inline int |
29a26a56 | 232 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, |
7026b1dd | 233 | struct sk_buff *skb, struct net_device *in, struct net_device *out, |
0c4b51f0 EB |
234 | int (*okfn)(struct net *, struct sock *, struct sk_buff *), |
235 | bool cond) | |
2249065f | 236 | { |
4bac6b18 PM |
237 | int ret; |
238 | ||
239 | if (!cond || | |
7a773504 | 240 | ((ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, INT_MIN)) == 1)) |
0c4b51f0 | 241 | ret = okfn(net, sk, skb); |
2249065f JE |
242 | return ret; |
243 | } | |
1da177e4 | 244 | |
2249065f | 245 | static inline int |
29a26a56 | 246 | NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb, |
2249065f | 247 | struct net_device *in, struct net_device *out, |
0c4b51f0 | 248 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
2249065f | 249 | { |
29a26a56 | 250 | return NF_HOOK_THRESH(pf, hook, net, sk, skb, in, out, okfn, INT_MIN); |
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); |
3db05fea | 286 | int (*reroute)(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 */ |
0c4b51f0 EB |
350 | #define NF_HOOK(pf, hook, net, sk, skb, indev, outdev, okfn) (okfn)(net, sk, skb) |
351 | #define NF_HOOK_COND(pf, hook, net, sk, skb, indev, outdev, okfn, cond) (okfn)(net, sk, skb) | |
29a26a56 EB |
352 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net, |
353 | struct sock *sk, struct sk_buff *skb, | |
354 | struct net_device *indev, struct net_device *outdev, | |
0c4b51f0 | 355 | int (*okfn)(struct net *, struct sock *, struct sk_buff *)) |
f53b61d8 | 356 | { |
9c92d348 | 357 | return 1; |
f53b61d8 | 358 | } |
f53b61d8 | 359 | struct flowi; |
eb9c7ebe | 360 | static inline void |
76108cea JE |
361 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
362 | { | |
363 | } | |
1da177e4 LT |
364 | #endif /*CONFIG_NETFILTER*/ |
365 | ||
5f79e0f9 | 366 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
62da9865 DB |
367 | #include <linux/netfilter/nf_conntrack_zones_common.h> |
368 | ||
312a0c16 | 369 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 370 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
0e60ebe0 | 371 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
9cb01766 PNA |
372 | |
373 | struct nf_conn; | |
41d73ec0 | 374 | enum ip_conntrack_info; |
9cb01766 PNA |
375 | struct nlattr; |
376 | ||
377 | struct nfq_ct_hook { | |
378 | size_t (*build_size)(const struct nf_conn *ct); | |
379 | int (*build)(struct sk_buff *skb, struct nf_conn *ct); | |
380 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); | |
bd077937 PNA |
381 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
382 | u32 portid, u32 report); | |
8c88f87c | 383 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 384 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 385 | }; |
41d73ec0 | 386 | extern struct nfq_ct_hook __rcu *nfq_ct_hook; |
5f79e0f9 YK |
387 | #else |
388 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
389 | #endif | |
390 | ||
e7c8899f FW |
391 | /** |
392 | * nf_skb_duplicated - TEE target has sent a packet | |
393 | * | |
394 | * When a xtables target sends a packet, the OUTPUT and POSTROUTING | |
395 | * hooks are traversed again, i.e. nft and xtables are invoked recursively. | |
396 | * | |
397 | * This is used by xtables TEE target to prevent the duplicated skb from | |
398 | * being duplicated again. | |
399 | */ | |
400 | DECLARE_PER_CPU(bool, nf_skb_duplicated); | |
401 | ||
1da177e4 | 402 | #endif /*__LINUX_NETFILTER_H*/ |