Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef __LINUX_NETFILTER_H |
2 | #define __LINUX_NETFILTER_H | |
3 | ||
4 | #ifdef __KERNEL__ | |
5 | #include <linux/init.h> | |
1da177e4 LT |
6 | #include <linux/skbuff.h> |
7 | #include <linux/net.h> | |
666953df | 8 | #include <linux/netdevice.h> |
1da177e4 | 9 | #include <linux/if.h> |
2e3075a2 JE |
10 | #include <linux/in.h> |
11 | #include <linux/in6.h> | |
1da177e4 LT |
12 | #include <linux/wait.h> |
13 | #include <linux/list.h> | |
666953df | 14 | #include <net/net_namespace.h> |
1da177e4 | 15 | #endif |
c8942f1f | 16 | #include <linux/types.h> |
1da177e4 LT |
17 | #include <linux/compiler.h> |
18 | ||
19 | /* Responses from hook functions. */ | |
20 | #define NF_DROP 0 | |
21 | #define NF_ACCEPT 1 | |
22 | #define NF_STOLEN 2 | |
23 | #define NF_QUEUE 3 | |
24 | #define NF_REPEAT 4 | |
25 | #define NF_STOP 5 | |
26 | #define NF_MAX_VERDICT NF_STOP | |
27 | ||
0ab43f84 HW |
28 | /* we overload the higher bits for encoding auxiliary data such as the queue |
29 | * number. Not nice, but better than additional function arguments. */ | |
30 | #define NF_VERDICT_MASK 0x0000ffff | |
31 | #define NF_VERDICT_BITS 16 | |
32 | ||
33 | #define NF_VERDICT_QMASK 0xffff0000 | |
34 | #define NF_VERDICT_QBITS 16 | |
35 | ||
fbabbed8 | 36 | #define NF_QUEUE_NR(x) ((((x) << NF_VERDICT_BITS) & NF_VERDICT_QMASK) | NF_QUEUE) |
0ab43f84 | 37 | |
6869c4d8 HW |
38 | /* only for userspace compatibility */ |
39 | #ifndef __KERNEL__ | |
1da177e4 LT |
40 | /* Generic cache responses from hook functions. |
41 | <= 0x2000 is used for protocol-flags. */ | |
42 | #define NFC_UNKNOWN 0x4000 | |
43 | #define NFC_ALTERED 0x8000 | |
6869c4d8 | 44 | #endif |
1da177e4 | 45 | |
6e23ae2a PM |
46 | enum nf_inet_hooks { |
47 | NF_INET_PRE_ROUTING, | |
48 | NF_INET_LOCAL_IN, | |
49 | NF_INET_FORWARD, | |
50 | NF_INET_LOCAL_OUT, | |
51 | NF_INET_POST_ROUTING, | |
52 | NF_INET_NUMHOOKS | |
53 | }; | |
54 | ||
643a2c15 | 55 | union nf_inet_addr { |
7b33ed22 | 56 | __u32 all[4]; |
643a2c15 JE |
57 | __be32 ip; |
58 | __be32 ip6[4]; | |
2e3075a2 JE |
59 | struct in_addr in; |
60 | struct in6_addr in6; | |
643a2c15 JE |
61 | }; |
62 | ||
1da177e4 | 63 | #ifdef __KERNEL__ |
1da177e4 LT |
64 | #ifdef CONFIG_NETFILTER |
65 | ||
b8beedd2 PM |
66 | static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
67 | const union nf_inet_addr *a2) | |
68 | { | |
69 | return a1->all[0] == a2->all[0] && | |
70 | a1->all[1] == a2->all[1] && | |
71 | a1->all[2] == a2->all[2] && | |
72 | a1->all[3] == a2->all[3]; | |
73 | } | |
74 | ||
1da177e4 LT |
75 | extern void netfilter_init(void); |
76 | ||
77 | /* Largest hook number + 1 */ | |
78 | #define NF_MAX_HOOKS 8 | |
79 | ||
80 | struct sk_buff; | |
1da177e4 LT |
81 | |
82 | typedef unsigned int nf_hookfn(unsigned int hooknum, | |
3db05fea | 83 | struct sk_buff *skb, |
1da177e4 LT |
84 | const struct net_device *in, |
85 | const struct net_device *out, | |
86 | int (*okfn)(struct sk_buff *)); | |
87 | ||
88 | struct nf_hook_ops | |
89 | { | |
90 | struct list_head list; | |
91 | ||
92 | /* User fills in from here down. */ | |
93 | nf_hookfn *hook; | |
94 | struct module *owner; | |
95 | int pf; | |
96 | int hooknum; | |
97 | /* Hooks are ordered in ascending priority. */ | |
98 | int priority; | |
99 | }; | |
100 | ||
101 | struct nf_sockopt_ops | |
102 | { | |
103 | struct list_head list; | |
104 | ||
105 | int pf; | |
106 | ||
107 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
108 | int set_optmin; | |
109 | int set_optmax; | |
110 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
3fdadf7d DM |
111 | int (*compat_set)(struct sock *sk, int optval, |
112 | void __user *user, unsigned int len); | |
1da177e4 LT |
113 | |
114 | int get_optmin; | |
115 | int get_optmax; | |
116 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
3fdadf7d DM |
117 | int (*compat_get)(struct sock *sk, int optval, |
118 | void __user *user, int *len); | |
1da177e4 | 119 | |
16fcec35 NH |
120 | /* Use the module struct to lock set/get code in place */ |
121 | struct module *owner; | |
1da177e4 LT |
122 | }; |
123 | ||
1da177e4 LT |
124 | /* Function to register/unregister hook points. */ |
125 | int nf_register_hook(struct nf_hook_ops *reg); | |
126 | void nf_unregister_hook(struct nf_hook_ops *reg); | |
972d1cb1 PM |
127 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
128 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); | |
1da177e4 LT |
129 | |
130 | /* Functions to register get/setsockopt ranges (non-inclusive). You | |
131 | need to check permissions yourself! */ | |
132 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
133 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
134 | ||
d62f9ed4 PM |
135 | #ifdef CONFIG_SYSCTL |
136 | /* Sysctl registration */ | |
b3fd3ffe PE |
137 | extern struct ctl_path nf_net_netfilter_sysctl_path[]; |
138 | extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[]; | |
d62f9ed4 PM |
139 | #endif /* CONFIG_SYSCTL */ |
140 | ||
1da177e4 LT |
141 | extern struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS]; |
142 | ||
3db05fea | 143 | int nf_hook_slow(int pf, unsigned int hook, struct sk_buff *skb, |
16a6677f PM |
144 | struct net_device *indev, struct net_device *outdev, |
145 | int (*okfn)(struct sk_buff *), int thresh); | |
146 | ||
147 | /** | |
148 | * nf_hook_thresh - call a netfilter hook | |
149 | * | |
150 | * Returns 1 if the hook has allowed the packet to pass. The function | |
151 | * okfn must be invoked by the caller in this case. Any other return | |
152 | * value indicates the packet has been consumed by the hook. | |
153 | */ | |
154 | static inline int nf_hook_thresh(int pf, unsigned int hook, | |
3db05fea | 155 | struct sk_buff *skb, |
16a6677f PM |
156 | struct net_device *indev, |
157 | struct net_device *outdev, | |
48d5cad8 PM |
158 | int (*okfn)(struct sk_buff *), int thresh, |
159 | int cond) | |
16a6677f | 160 | { |
48d5cad8 PM |
161 | if (!cond) |
162 | return 1; | |
16a6677f PM |
163 | #ifndef CONFIG_NETFILTER_DEBUG |
164 | if (list_empty(&nf_hooks[pf][hook])) | |
165 | return 1; | |
166 | #endif | |
3db05fea | 167 | return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh); |
16a6677f PM |
168 | } |
169 | ||
3db05fea | 170 | static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb, |
16a6677f PM |
171 | struct net_device *indev, struct net_device *outdev, |
172 | int (*okfn)(struct sk_buff *)) | |
173 | { | |
3db05fea | 174 | return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN, 1); |
16a6677f | 175 | } |
1da177e4 LT |
176 | |
177 | /* Activate hook; either okfn or kfree_skb called, unless a hook | |
178 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
179 | the consequences). | |
180 | ||
181 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
182 | accepted. | |
183 | */ | |
184 | ||
185 | /* RR: | |
186 | > I don't want nf_hook to return anything because people might forget | |
187 | > about async and trust the return value to mean "packet was ok". | |
188 | ||
189 | AK: | |
190 | Just document it clearly, then you can expect some sense from kernel | |
191 | coders :) | |
192 | */ | |
193 | ||
194 | /* This is gross, but inline doesn't cut it for avoiding the function | |
195 | call in fast path: gcc doesn't inline (needs value tracking?). --RR */ | |
16a6677f PM |
196 | |
197 | /* HX: It's slightly less gross now. */ | |
198 | ||
1da177e4 LT |
199 | #define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \ |
200 | ({int __ret; \ | |
3db05fea | 201 | if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, thresh, 1)) == 1)\ |
48d5cad8 PM |
202 | __ret = (okfn)(skb); \ |
203 | __ret;}) | |
204 | ||
205 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) \ | |
206 | ({int __ret; \ | |
3db05fea | 207 | if ((__ret=nf_hook_thresh(pf, hook, (skb), indev, outdev, okfn, INT_MIN, cond)) == 1)\ |
1da177e4 LT |
208 | __ret = (okfn)(skb); \ |
209 | __ret;}) | |
1da177e4 | 210 | |
16a6677f PM |
211 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \ |
212 | NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, INT_MIN) | |
1da177e4 LT |
213 | |
214 | /* Call setsockopt() */ | |
215 | int nf_setsockopt(struct sock *sk, int pf, int optval, char __user *opt, | |
216 | int len); | |
217 | int nf_getsockopt(struct sock *sk, int pf, int optval, char __user *opt, | |
218 | int *len); | |
219 | ||
3fdadf7d DM |
220 | int compat_nf_setsockopt(struct sock *sk, int pf, int optval, |
221 | char __user *opt, int len); | |
222 | int compat_nf_getsockopt(struct sock *sk, int pf, int optval, | |
223 | char __user *opt, int *len); | |
224 | ||
089af26c HW |
225 | /* Call this before modifying an existing packet: ensures it is |
226 | modifiable and linear to the point you care about (writable_len). | |
227 | Returns true or false. */ | |
37d41879 | 228 | extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 229 | |
1841a4c7 | 230 | struct flowi; |
02f014d8 | 231 | struct nf_queue_entry; |
c01cd429 | 232 | |
bce8032e PM |
233 | struct nf_afinfo { |
234 | unsigned short family; | |
b51655b9 | 235 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 236 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
237 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
238 | unsigned int hook, | |
239 | unsigned int dataoff, | |
240 | unsigned int len, | |
241 | u_int8_t protocol); | |
1841a4c7 | 242 | int (*route)(struct dst_entry **dst, struct flowi *fl); |
bce8032e | 243 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 244 | struct nf_queue_entry *entry); |
3db05fea | 245 | int (*reroute)(struct sk_buff *skb, |
02f014d8 | 246 | const struct nf_queue_entry *entry); |
bce8032e | 247 | int route_key_size; |
2cc7d573 HW |
248 | }; |
249 | ||
1e796fda PM |
250 | extern const struct nf_afinfo *nf_afinfo[NPROTO]; |
251 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) | |
bce8032e PM |
252 | { |
253 | return rcu_dereference(nf_afinfo[family]); | |
254 | } | |
2cc7d573 | 255 | |
b51655b9 | 256 | static inline __sum16 |
422c346f PM |
257 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
258 | u_int8_t protocol, unsigned short family) | |
259 | { | |
1e796fda | 260 | const struct nf_afinfo *afinfo; |
b51655b9 | 261 | __sum16 csum = 0; |
422c346f PM |
262 | |
263 | rcu_read_lock(); | |
264 | afinfo = nf_get_afinfo(family); | |
265 | if (afinfo) | |
266 | csum = afinfo->checksum(skb, hook, dataoff, protocol); | |
267 | rcu_read_unlock(); | |
268 | return csum; | |
269 | } | |
270 | ||
d63a6507 PM |
271 | static inline __sum16 |
272 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, | |
273 | unsigned int dataoff, unsigned int len, | |
274 | u_int8_t protocol, unsigned short family) | |
275 | { | |
276 | const struct nf_afinfo *afinfo; | |
277 | __sum16 csum = 0; | |
278 | ||
279 | rcu_read_lock(); | |
280 | afinfo = nf_get_afinfo(family); | |
281 | if (afinfo) | |
282 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, | |
283 | protocol); | |
284 | rcu_read_unlock(); | |
285 | return csum; | |
286 | } | |
287 | ||
1e796fda PM |
288 | extern int nf_register_afinfo(const struct nf_afinfo *afinfo); |
289 | extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 290 | |
eb9c7ebe PM |
291 | #include <net/flow.h> |
292 | extern void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *); | |
293 | ||
294 | static inline void | |
295 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family) | |
296 | { | |
051578cc | 297 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
298 | void (*decodefn)(struct sk_buff *, struct flowi *); |
299 | ||
051578cc PM |
300 | if (family == AF_INET) { |
301 | rcu_read_lock(); | |
302 | decodefn = rcu_dereference(ip_nat_decode_session); | |
303 | if (decodefn) | |
304 | decodefn(skb, fl); | |
305 | rcu_read_unlock(); | |
306 | } | |
eb9c7ebe PM |
307 | #endif |
308 | } | |
309 | ||
608c8e4f HW |
310 | #ifdef CONFIG_PROC_FS |
311 | #include <linux/proc_fs.h> | |
312 | extern struct proc_dir_entry *proc_net_netfilter; | |
313 | #endif | |
314 | ||
1da177e4 LT |
315 | #else /* !CONFIG_NETFILTER */ |
316 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) | |
48d5cad8 | 317 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb) |
f53b61d8 | 318 | static inline int nf_hook_thresh(int pf, unsigned int hook, |
3db05fea | 319 | struct sk_buff *skb, |
f53b61d8 DM |
320 | struct net_device *indev, |
321 | struct net_device *outdev, | |
48d5cad8 PM |
322 | int (*okfn)(struct sk_buff *), int thresh, |
323 | int cond) | |
f53b61d8 | 324 | { |
3db05fea | 325 | return okfn(skb); |
f53b61d8 | 326 | } |
3db05fea | 327 | static inline int nf_hook(int pf, unsigned int hook, struct sk_buff *skb, |
f53b61d8 DM |
328 | struct net_device *indev, struct net_device *outdev, |
329 | int (*okfn)(struct sk_buff *)) | |
330 | { | |
9c92d348 | 331 | return 1; |
f53b61d8 | 332 | } |
f53b61d8 | 333 | struct flowi; |
eb9c7ebe PM |
334 | static inline void |
335 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, int family) {} | |
1da177e4 LT |
336 | #endif /*CONFIG_NETFILTER*/ |
337 | ||
5f79e0f9 YK |
338 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
339 | extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *); | |
340 | extern void nf_ct_attach(struct sk_buff *, struct sk_buff *); | |
de6e05c4 | 341 | extern void (*nf_ct_destroy)(struct nf_conntrack *); |
5f79e0f9 YK |
342 | #else |
343 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
344 | #endif | |
345 | ||
666953df AD |
346 | static inline struct net *nf_pre_routing_net(const struct net_device *in, |
347 | const struct net_device *out) | |
348 | { | |
349 | #ifdef CONFIG_NET_NS | |
350 | return in->nd_net; | |
351 | #else | |
352 | return &init_net; | |
353 | #endif | |
354 | } | |
355 | ||
356 | static inline struct net *nf_local_in_net(const struct net_device *in, | |
357 | const struct net_device *out) | |
358 | { | |
359 | #ifdef CONFIG_NET_NS | |
360 | return in->nd_net; | |
361 | #else | |
362 | return &init_net; | |
363 | #endif | |
364 | } | |
365 | ||
366 | static inline struct net *nf_forward_net(const struct net_device *in, | |
367 | const struct net_device *out) | |
368 | { | |
369 | #ifdef CONFIG_NET_NS | |
370 | BUG_ON(in->nd_net != out->nd_net); | |
371 | return in->nd_net; | |
372 | #else | |
373 | return &init_net; | |
374 | #endif | |
375 | } | |
376 | ||
377 | static inline struct net *nf_local_out_net(const struct net_device *in, | |
378 | const struct net_device *out) | |
379 | { | |
380 | #ifdef CONFIG_NET_NS | |
381 | return out->nd_net; | |
382 | #else | |
383 | return &init_net; | |
384 | #endif | |
385 | } | |
386 | ||
387 | static inline struct net *nf_post_routing_net(const struct net_device *in, | |
388 | const struct net_device *out) | |
389 | { | |
390 | #ifdef CONFIG_NET_NS | |
391 | return out->nd_net; | |
392 | #else | |
393 | return &init_net; | |
394 | #endif | |
395 | } | |
396 | ||
1da177e4 LT |
397 | #endif /*__KERNEL__*/ |
398 | #endif /*__LINUX_NETFILTER_H*/ |