Commit | Line | Data |
---|---|---|
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> |
607ca46e | 13 | #include <uapi/linux/netfilter.h> |
1da177e4 | 14 | #ifdef CONFIG_NETFILTER |
f615df76 FW |
15 | static inline int NF_DROP_GETERR(int verdict) |
16 | { | |
17 | return -(verdict >> NF_VERDICT_QBITS); | |
18 | } | |
1da177e4 | 19 | |
b8beedd2 PM |
20 | static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
21 | const union nf_inet_addr *a2) | |
22 | { | |
23 | return a1->all[0] == a2->all[0] && | |
24 | a1->all[1] == a2->all[1] && | |
25 | a1->all[2] == a2->all[2] && | |
26 | a1->all[3] == a2->all[3]; | |
27 | } | |
28 | ||
efdedd54 DF |
29 | static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, |
30 | union nf_inet_addr *result, | |
31 | const union nf_inet_addr *mask) | |
32 | { | |
33 | result->all[0] = a1->all[0] & mask->all[0]; | |
34 | result->all[1] = a1->all[1] & mask->all[1]; | |
35 | result->all[2] = a1->all[2] & mask->all[2]; | |
36 | result->all[3] = a1->all[3] & mask->all[3]; | |
37 | } | |
38 | ||
a0f4ecf3 | 39 | int netfilter_init(void); |
1da177e4 LT |
40 | |
41 | /* Largest hook number + 1 */ | |
42 | #define NF_MAX_HOOKS 8 | |
43 | ||
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; |
7026b1dd | 57 | int (*okfn)(struct sock *, struct sk_buff *); |
cfdfab31 DM |
58 | }; |
59 | ||
107a9f4d DM |
60 | static inline void nf_hook_state_init(struct nf_hook_state *p, |
61 | unsigned int hook, | |
62 | int thresh, u_int8_t pf, | |
63 | struct net_device *indev, | |
64 | struct net_device *outdev, | |
1c984f8a | 65 | struct sock *sk, |
7026b1dd | 66 | int (*okfn)(struct sock *, struct sk_buff *)) |
107a9f4d DM |
67 | { |
68 | p->hook = hook; | |
69 | p->thresh = thresh; | |
70 | p->pf = pf; | |
71 | p->in = indev; | |
72 | p->out = outdev; | |
1c984f8a | 73 | p->sk = sk; |
107a9f4d DM |
74 | p->okfn = okfn; |
75 | } | |
76 | ||
795aa6ef | 77 | typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops, |
3db05fea | 78 | struct sk_buff *skb, |
238e54c9 | 79 | const struct nf_hook_state *state); |
1da177e4 | 80 | |
d94d9fee | 81 | struct nf_hook_ops { |
1da177e4 LT |
82 | struct list_head list; |
83 | ||
84 | /* User fills in from here down. */ | |
96518518 PM |
85 | nf_hookfn *hook; |
86 | struct module *owner; | |
87 | void *priv; | |
88 | u_int8_t pf; | |
89 | unsigned int hooknum; | |
1da177e4 | 90 | /* Hooks are ordered in ascending priority. */ |
96518518 | 91 | int priority; |
1da177e4 LT |
92 | }; |
93 | ||
d94d9fee | 94 | struct nf_sockopt_ops { |
1da177e4 LT |
95 | struct list_head list; |
96 | ||
76108cea | 97 | u_int8_t pf; |
1da177e4 LT |
98 | |
99 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
100 | int set_optmin; | |
101 | int set_optmax; | |
102 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
c30f540b | 103 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
104 | int (*compat_set)(struct sock *sk, int optval, |
105 | void __user *user, unsigned int len); | |
c30f540b | 106 | #endif |
1da177e4 LT |
107 | int get_optmin; |
108 | int get_optmax; | |
109 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 110 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
111 | int (*compat_get)(struct sock *sk, int optval, |
112 | void __user *user, int *len); | |
c30f540b | 113 | #endif |
16fcec35 NH |
114 | /* Use the module struct to lock set/get code in place */ |
115 | struct module *owner; | |
1da177e4 LT |
116 | }; |
117 | ||
1da177e4 LT |
118 | /* Function to register/unregister hook points. */ |
119 | int nf_register_hook(struct nf_hook_ops *reg); | |
120 | void nf_unregister_hook(struct nf_hook_ops *reg); | |
972d1cb1 PM |
121 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
122 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); | |
1da177e4 LT |
123 | |
124 | /* Functions to register get/setsockopt ranges (non-inclusive). You | |
125 | need to check permissions yourself! */ | |
126 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
127 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
128 | ||
7e9c6eeb | 129 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
1da177e4 | 130 | |
d1c85c2e | 131 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 132 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
d1c85c2e | 133 | |
a2d7ec58 ED |
134 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
135 | { | |
136 | if (__builtin_constant_p(pf) && | |
137 | __builtin_constant_p(hook)) | |
c5905afb | 138 | return static_key_false(&nf_hooks_needed[pf][hook]); |
a2d7ec58 ED |
139 | |
140 | return !list_empty(&nf_hooks[pf][hook]); | |
141 | } | |
142 | #else | |
143 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) | |
144 | { | |
145 | return !list_empty(&nf_hooks[pf][hook]); | |
146 | } | |
147 | #endif | |
148 | ||
cfdfab31 | 149 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state); |
16a6677f PM |
150 | |
151 | /** | |
152 | * nf_hook_thresh - call a netfilter hook | |
153 | * | |
154 | * Returns 1 if the hook has allowed the packet to pass. The function | |
155 | * okfn must be invoked by the caller in this case. Any other return | |
156 | * value indicates the packet has been consumed by the hook. | |
157 | */ | |
76108cea | 158 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
7026b1dd | 159 | struct sock *sk, |
3db05fea | 160 | struct sk_buff *skb, |
16a6677f PM |
161 | struct net_device *indev, |
162 | struct net_device *outdev, | |
7026b1dd DM |
163 | int (*okfn)(struct sock *, struct sk_buff *), |
164 | int thresh) | |
16a6677f | 165 | { |
cfdfab31 | 166 | if (nf_hooks_active(pf, hook)) { |
107a9f4d | 167 | struct nf_hook_state state; |
cfdfab31 | 168 | |
107a9f4d | 169 | nf_hook_state_init(&state, hook, thresh, pf, |
7026b1dd | 170 | indev, outdev, sk, okfn); |
cfdfab31 DM |
171 | return nf_hook_slow(skb, &state); |
172 | } | |
a2d7ec58 | 173 | return 1; |
16a6677f PM |
174 | } |
175 | ||
7026b1dd DM |
176 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk, |
177 | struct sk_buff *skb, struct net_device *indev, | |
178 | struct net_device *outdev, | |
179 | int (*okfn)(struct sock *, struct sk_buff *)) | |
16a6677f | 180 | { |
7026b1dd | 181 | return nf_hook_thresh(pf, hook, sk, skb, indev, outdev, okfn, INT_MIN); |
16a6677f | 182 | } |
1da177e4 LT |
183 | |
184 | /* Activate hook; either okfn or kfree_skb called, unless a hook | |
185 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
186 | the consequences). | |
187 | ||
188 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
189 | accepted. | |
190 | */ | |
191 | ||
192 | /* RR: | |
193 | > I don't want nf_hook to return anything because people might forget | |
194 | > about async and trust the return value to mean "packet was ok". | |
195 | ||
196 | AK: | |
197 | Just document it clearly, then you can expect some sense from kernel | |
198 | coders :) | |
199 | */ | |
200 | ||
2249065f | 201 | static inline int |
7026b1dd DM |
202 | NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sock *sk, |
203 | struct sk_buff *skb, struct net_device *in, | |
204 | struct net_device *out, | |
205 | int (*okfn)(struct sock *, struct sk_buff *), int thresh) | |
2249065f | 206 | { |
7026b1dd | 207 | int ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, thresh); |
2249065f | 208 | if (ret == 1) |
7026b1dd | 209 | ret = okfn(sk, skb); |
2249065f JE |
210 | return ret; |
211 | } | |
48d5cad8 | 212 | |
2249065f | 213 | static inline int |
7026b1dd DM |
214 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sock *sk, |
215 | struct sk_buff *skb, struct net_device *in, struct net_device *out, | |
216 | int (*okfn)(struct sock *, struct sk_buff *), bool cond) | |
2249065f | 217 | { |
4bac6b18 PM |
218 | int ret; |
219 | ||
220 | if (!cond || | |
7026b1dd DM |
221 | ((ret = nf_hook_thresh(pf, hook, sk, skb, in, out, okfn, INT_MIN)) == 1)) |
222 | ret = okfn(sk, skb); | |
2249065f JE |
223 | return ret; |
224 | } | |
1da177e4 | 225 | |
2249065f | 226 | static inline int |
7026b1dd | 227 | NF_HOOK(uint8_t pf, unsigned int hook, struct sock *sk, struct sk_buff *skb, |
2249065f | 228 | struct net_device *in, struct net_device *out, |
7026b1dd | 229 | int (*okfn)(struct sock *, struct sk_buff *)) |
2249065f | 230 | { |
7026b1dd | 231 | return NF_HOOK_THRESH(pf, hook, sk, skb, in, out, okfn, INT_MIN); |
2249065f | 232 | } |
1da177e4 LT |
233 | |
234 | /* Call setsockopt() */ | |
76108cea | 235 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 236 | unsigned int len); |
76108cea | 237 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 238 | int *len); |
c30f540b | 239 | #ifdef CONFIG_COMPAT |
76108cea | 240 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 241 | char __user *opt, unsigned int len); |
76108cea | 242 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 243 | char __user *opt, int *len); |
c30f540b | 244 | #endif |
3fdadf7d | 245 | |
089af26c HW |
246 | /* Call this before modifying an existing packet: ensures it is |
247 | modifiable and linear to the point you care about (writable_len). | |
248 | Returns true or false. */ | |
a0f4ecf3 | 249 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 250 | |
1841a4c7 | 251 | struct flowi; |
02f014d8 | 252 | struct nf_queue_entry; |
c01cd429 | 253 | |
bce8032e PM |
254 | struct nf_afinfo { |
255 | unsigned short family; | |
b51655b9 | 256 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 257 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
258 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
259 | unsigned int hook, | |
260 | unsigned int dataoff, | |
261 | unsigned int len, | |
262 | u_int8_t protocol); | |
31ad3dd6 | 263 | int (*route)(struct net *net, struct dst_entry **dst, |
0fae2e77 | 264 | struct flowi *fl, bool strict); |
bce8032e | 265 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 266 | struct nf_queue_entry *entry); |
3db05fea | 267 | int (*reroute)(struct sk_buff *skb, |
02f014d8 | 268 | const struct nf_queue_entry *entry); |
bce8032e | 269 | int route_key_size; |
2cc7d573 HW |
270 | }; |
271 | ||
0e60ebe0 | 272 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
1e796fda | 273 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
bce8032e PM |
274 | { |
275 | return rcu_dereference(nf_afinfo[family]); | |
276 | } | |
2cc7d573 | 277 | |
b51655b9 | 278 | static inline __sum16 |
422c346f PM |
279 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
280 | u_int8_t protocol, unsigned short family) | |
281 | { | |
1e796fda | 282 | const struct nf_afinfo *afinfo; |
b51655b9 | 283 | __sum16 csum = 0; |
422c346f PM |
284 | |
285 | rcu_read_lock(); | |
286 | afinfo = nf_get_afinfo(family); | |
287 | if (afinfo) | |
288 | csum = afinfo->checksum(skb, hook, dataoff, protocol); | |
289 | rcu_read_unlock(); | |
290 | return csum; | |
291 | } | |
292 | ||
d63a6507 PM |
293 | static inline __sum16 |
294 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, | |
295 | unsigned int dataoff, unsigned int len, | |
296 | u_int8_t protocol, unsigned short family) | |
297 | { | |
298 | const struct nf_afinfo *afinfo; | |
299 | __sum16 csum = 0; | |
300 | ||
301 | rcu_read_lock(); | |
302 | afinfo = nf_get_afinfo(family); | |
303 | if (afinfo) | |
304 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, | |
305 | protocol); | |
306 | rcu_read_unlock(); | |
307 | return csum; | |
308 | } | |
309 | ||
a0f4ecf3 JP |
310 | int nf_register_afinfo(const struct nf_afinfo *afinfo); |
311 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 312 | |
eb9c7ebe | 313 | #include <net/flow.h> |
c7232c99 | 314 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
eb9c7ebe PM |
315 | |
316 | static inline void | |
76108cea | 317 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 318 | { |
051578cc | 319 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
320 | void (*decodefn)(struct sk_buff *, struct flowi *); |
321 | ||
c7232c99 PM |
322 | rcu_read_lock(); |
323 | decodefn = rcu_dereference(nf_nat_decode_session_hook); | |
324 | if (decodefn) | |
325 | decodefn(skb, fl); | |
326 | rcu_read_unlock(); | |
eb9c7ebe PM |
327 | #endif |
328 | } | |
329 | ||
1da177e4 | 330 | #else /* !CONFIG_NETFILTER */ |
7026b1dd DM |
331 | #define NF_HOOK(pf, hook, sk, skb, indev, outdev, okfn) (okfn)(sk, skb) |
332 | #define NF_HOOK_COND(pf, hook, sk, skb, indev, outdev, okfn, cond) (okfn)(sk, skb) | |
76108cea | 333 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
7026b1dd | 334 | struct sock *sk, |
3db05fea | 335 | struct sk_buff *skb, |
f53b61d8 DM |
336 | struct net_device *indev, |
337 | struct net_device *outdev, | |
7026b1dd | 338 | int (*okfn)(struct sock *sk, struct sk_buff *), int thresh) |
f53b61d8 | 339 | { |
7026b1dd | 340 | return okfn(sk, skb); |
f53b61d8 | 341 | } |
7026b1dd DM |
342 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sock *sk, |
343 | struct sk_buff *skb, struct net_device *indev, | |
344 | struct net_device *outdev, | |
345 | int (*okfn)(struct sock *, struct sk_buff *)) | |
f53b61d8 | 346 | { |
9c92d348 | 347 | return 1; |
f53b61d8 | 348 | } |
f53b61d8 | 349 | struct flowi; |
eb9c7ebe | 350 | static inline void |
76108cea JE |
351 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
352 | { | |
353 | } | |
1da177e4 LT |
354 | #endif /*CONFIG_NETFILTER*/ |
355 | ||
5f79e0f9 | 356 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
312a0c16 | 357 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 358 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
0e60ebe0 | 359 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
9cb01766 PNA |
360 | |
361 | struct nf_conn; | |
41d73ec0 | 362 | enum ip_conntrack_info; |
9cb01766 PNA |
363 | struct nlattr; |
364 | ||
365 | struct nfq_ct_hook { | |
366 | size_t (*build_size)(const struct nf_conn *ct); | |
367 | int (*build)(struct sk_buff *skb, struct nf_conn *ct); | |
368 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); | |
bd077937 PNA |
369 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
370 | u32 portid, u32 report); | |
8c88f87c | 371 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 372 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 373 | }; |
41d73ec0 | 374 | extern struct nfq_ct_hook __rcu *nfq_ct_hook; |
5f79e0f9 YK |
375 | #else |
376 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
377 | #endif | |
378 | ||
1da177e4 | 379 | #endif /*__LINUX_NETFILTER_H*/ |