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1 | #ifndef __LINUX_NETFILTER_H |
2 | #define __LINUX_NETFILTER_H |
3 | |
4 | #ifdef __KERNEL__ |
5 | #include <linux/init.h> |
6 | #include <linux/skbuff.h> |
7 | #include <linux/net.h> |
8 | #include <linux/if.h> |
9 | #include <linux/in.h> |
10 | #include <linux/in6.h> |
11 | #include <linux/wait.h> |
12 | #include <linux/list.h> |
13 | #endif |
14 | #include <linux/types.h> |
15 | #include <linux/compiler.h> |
16 | |
17 | /* Responses from hook functions. */ |
18 | #define NF_DROP 0 |
19 | #define NF_ACCEPT 1 |
20 | #define NF_STOLEN 2 |
21 | #define NF_QUEUE 3 |
22 | #define NF_REPEAT 4 |
23 | #define NF_STOP 5 |
24 | #define NF_MAX_VERDICT NF_STOP |
25 | |
26 | /* we overload the higher bits for encoding auxiliary data such as the queue |
27 | * number. Not nice, but better than additional function arguments. */ |
28 | #define NF_VERDICT_MASK 0x0000ffff |
29 | #define NF_VERDICT_BITS 16 |
30 | |
31 | #define NF_VERDICT_QMASK 0xffff0000 |
32 | #define NF_VERDICT_QBITS 16 |
33 | |
34 | #define NF_QUEUE_NR(x) ((((x) << NF_VERDICT_BITS) & NF_VERDICT_QMASK) | NF_QUEUE) |
35 | |
36 | /* only for userspace compatibility */ |
37 | #ifndef __KERNEL__ |
38 | /* Generic cache responses from hook functions. |
39 | <= 0x2000 is used for protocol-flags. */ |
40 | #define NFC_UNKNOWN 0x4000 |
41 | #define NFC_ALTERED 0x8000 |
42 | #endif |
43 | |
44 | enum nf_inet_hooks { |
45 | NF_INET_PRE_ROUTING, |
46 | NF_INET_LOCAL_IN, |
47 | NF_INET_FORWARD, |
48 | NF_INET_LOCAL_OUT, |
49 | NF_INET_POST_ROUTING, |
50 | NF_INET_NUMHOOKS |
51 | }; |
52 | |
53 | enum { |
54 | NFPROTO_UNSPEC = 0, |
55 | NFPROTO_IPV4 = 2, |
56 | NFPROTO_ARP = 3, |
57 | NFPROTO_BRIDGE = 7, |
58 | NFPROTO_IPV6 = 10, |
59 | NFPROTO_DECNET = 12, |
60 | NFPROTO_NUMPROTO, |
61 | }; |
62 | |
63 | union nf_inet_addr { |
64 | __u32 all[4]; |
65 | __be32 ip; |
66 | __be32 ip6[4]; |
67 | struct in_addr in; |
68 | struct in6_addr in6; |
69 | }; |
70 | |
71 | #ifdef __KERNEL__ |
72 | #ifdef CONFIG_NETFILTER |
73 | |
74 | static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
75 | const union nf_inet_addr *a2) |
76 | { |
77 | return a1->all[0] == a2->all[0] && |
78 | a1->all[1] == a2->all[1] && |
79 | a1->all[2] == a2->all[2] && |
80 | a1->all[3] == a2->all[3]; |
81 | } |
82 | |
83 | extern void netfilter_init(void); |
84 | |
85 | /* Largest hook number + 1 */ |
86 | #define NF_MAX_HOOKS 8 |
87 | |
88 | struct sk_buff; |
89 | |
90 | typedef unsigned int nf_hookfn(unsigned int hooknum, |
91 | struct sk_buff *skb, |
92 | const struct net_device *in, |
93 | const struct net_device *out, |
94 | int (*okfn)(struct sk_buff *)); |
95 | |
96 | struct nf_hook_ops { |
97 | struct list_head list; |
98 | |
99 | /* User fills in from here down. */ |
100 | nf_hookfn *hook; |
101 | struct module *owner; |
102 | u_int8_t pf; |
103 | unsigned int hooknum; |
104 | /* Hooks are ordered in ascending priority. */ |
105 | int priority; |
106 | }; |
107 | |
108 | struct nf_sockopt_ops { |
109 | struct list_head list; |
110 | |
111 | u_int8_t pf; |
112 | |
113 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ |
114 | int set_optmin; |
115 | int set_optmax; |
116 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); |
117 | #ifdef CONFIG_COMPAT |
118 | int (*compat_set)(struct sock *sk, int optval, |
119 | void __user *user, unsigned int len); |
120 | #endif |
121 | int get_optmin; |
122 | int get_optmax; |
123 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); |
124 | #ifdef CONFIG_COMPAT |
125 | int (*compat_get)(struct sock *sk, int optval, |
126 | void __user *user, int *len); |
127 | #endif |
128 | /* Use the module struct to lock set/get code in place */ |
129 | struct module *owner; |
130 | }; |
131 | |
132 | /* Function to register/unregister hook points. */ |
133 | int nf_register_hook(struct nf_hook_ops *reg); |
134 | void nf_unregister_hook(struct nf_hook_ops *reg); |
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); |
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 | |
143 | #ifdef CONFIG_SYSCTL |
144 | /* Sysctl registration */ |
145 | extern struct ctl_path nf_net_netfilter_sysctl_path[]; |
146 | extern struct ctl_path nf_net_ipv4_netfilter_sysctl_path[]; |
147 | #endif /* CONFIG_SYSCTL */ |
148 | |
149 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
150 | |
151 | int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
152 | struct net_device *indev, struct net_device *outdev, |
153 | int (*okfn)(struct sk_buff *), int thresh); |
154 | |
155 | /** |
156 | * nf_hook_thresh - call a netfilter hook |
157 | * |
158 | * Returns 1 if the hook has allowed the packet to pass. The function |
159 | * okfn must be invoked by the caller in this case. Any other return |
160 | * value indicates the packet has been consumed by the hook. |
161 | */ |
162 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
163 | struct sk_buff *skb, |
164 | struct net_device *indev, |
165 | struct net_device *outdev, |
166 | int (*okfn)(struct sk_buff *), int thresh) |
167 | { |
168 | #ifndef CONFIG_NETFILTER_DEBUG |
169 | if (list_empty(&nf_hooks[pf][hook])) |
170 | return 1; |
171 | #endif |
172 | return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh); |
173 | } |
174 | |
175 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
176 | struct net_device *indev, struct net_device *outdev, |
177 | int (*okfn)(struct sk_buff *)) |
178 | { |
179 | return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN); |
180 | } |
181 | |
182 | /* Activate hook; either okfn or kfree_skb called, unless a hook |
183 | returns NF_STOLEN (in which case, it's up to the hook to deal with |
184 | the consequences). |
185 | |
186 | Returns -ERRNO if packet dropped. Zero means queued, stolen or |
187 | accepted. |
188 | */ |
189 | |
190 | /* RR: |
191 | > I don't want nf_hook to return anything because people might forget |
192 | > about async and trust the return value to mean "packet was ok". |
193 | |
194 | AK: |
195 | Just document it clearly, then you can expect some sense from kernel |
196 | coders :) |
197 | */ |
198 | |
199 | static inline int |
200 | NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
201 | struct net_device *in, struct net_device *out, |
202 | int (*okfn)(struct sk_buff *), int thresh) |
203 | { |
204 | int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh); |
205 | if (ret == 1) |
206 | ret = okfn(skb); |
207 | return ret; |
208 | } |
209 | |
210 | static inline int |
211 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
212 | struct net_device *in, struct net_device *out, |
213 | int (*okfn)(struct sk_buff *), bool cond) |
214 | { |
215 | int ret; |
216 | |
217 | if (!cond || |
218 | (ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN) == 1)) |
219 | ret = okfn(skb); |
220 | return ret; |
221 | } |
222 | |
223 | static inline int |
224 | NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
225 | struct net_device *in, struct net_device *out, |
226 | int (*okfn)(struct sk_buff *)) |
227 | { |
228 | return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN); |
229 | } |
230 | |
231 | /* Call setsockopt() */ |
232 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
233 | unsigned int len); |
234 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
235 | int *len); |
236 | #ifdef CONFIG_COMPAT |
237 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
238 | char __user *opt, unsigned int len); |
239 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
240 | char __user *opt, int *len); |
241 | #endif |
242 | |
243 | /* Call this before modifying an existing packet: ensures it is |
244 | modifiable and linear to the point you care about (writable_len). |
245 | Returns true or false. */ |
246 | extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
247 | |
248 | struct flowi; |
249 | struct nf_queue_entry; |
250 | |
251 | struct nf_afinfo { |
252 | unsigned short family; |
253 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
254 | unsigned int dataoff, u_int8_t protocol); |
255 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
256 | unsigned int hook, |
257 | unsigned int dataoff, |
258 | unsigned int len, |
259 | u_int8_t protocol); |
260 | int (*route)(struct dst_entry **dst, struct flowi *fl); |
261 | void (*saveroute)(const struct sk_buff *skb, |
262 | struct nf_queue_entry *entry); |
263 | int (*reroute)(struct sk_buff *skb, |
264 | const struct nf_queue_entry *entry); |
265 | int route_key_size; |
266 | }; |
267 | |
268 | extern const struct nf_afinfo *nf_afinfo[NFPROTO_NUMPROTO]; |
269 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
270 | { |
271 | return rcu_dereference(nf_afinfo[family]); |
272 | } |
273 | |
274 | static inline __sum16 |
275 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
276 | u_int8_t protocol, unsigned short family) |
277 | { |
278 | const struct nf_afinfo *afinfo; |
279 | __sum16 csum = 0; |
280 | |
281 | rcu_read_lock(); |
282 | afinfo = nf_get_afinfo(family); |
283 | if (afinfo) |
284 | csum = afinfo->checksum(skb, hook, dataoff, protocol); |
285 | rcu_read_unlock(); |
286 | return csum; |
287 | } |
288 | |
289 | static inline __sum16 |
290 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, |
291 | unsigned int dataoff, unsigned int len, |
292 | u_int8_t protocol, unsigned short family) |
293 | { |
294 | const struct nf_afinfo *afinfo; |
295 | __sum16 csum = 0; |
296 | |
297 | rcu_read_lock(); |
298 | afinfo = nf_get_afinfo(family); |
299 | if (afinfo) |
300 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, |
301 | protocol); |
302 | rcu_read_unlock(); |
303 | return csum; |
304 | } |
305 | |
306 | extern int nf_register_afinfo(const struct nf_afinfo *afinfo); |
307 | extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo); |
308 | |
309 | #include <net/flow.h> |
310 | extern void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *); |
311 | |
312 | static inline void |
313 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
314 | { |
315 | #ifdef CONFIG_NF_NAT_NEEDED |
316 | void (*decodefn)(struct sk_buff *, struct flowi *); |
317 | |
318 | if (family == AF_INET) { |
319 | rcu_read_lock(); |
320 | decodefn = rcu_dereference(ip_nat_decode_session); |
321 | if (decodefn) |
322 | decodefn(skb, fl); |
323 | rcu_read_unlock(); |
324 | } |
325 | #endif |
326 | } |
327 | |
328 | #ifdef CONFIG_PROC_FS |
329 | #include <linux/proc_fs.h> |
330 | extern struct proc_dir_entry *proc_net_netfilter; |
331 | #endif |
332 | |
333 | #else /* !CONFIG_NETFILTER */ |
334 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) |
335 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb) |
336 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
337 | struct sk_buff *skb, |
338 | struct net_device *indev, |
339 | struct net_device *outdev, |
340 | int (*okfn)(struct sk_buff *), int thresh) |
341 | { |
342 | return okfn(skb); |
343 | } |
344 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
345 | struct net_device *indev, struct net_device *outdev, |
346 | int (*okfn)(struct sk_buff *)) |
347 | { |
348 | return 1; |
349 | } |
350 | struct flowi; |
351 | static inline void |
352 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
353 | { |
354 | } |
355 | #endif /*CONFIG_NETFILTER*/ |
356 | |
357 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
358 | extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *); |
359 | extern void nf_ct_attach(struct sk_buff *, struct sk_buff *); |
360 | extern void (*nf_ct_destroy)(struct nf_conntrack *); |
361 | #else |
362 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} |
363 | #endif |
364 | |
365 | #endif /*__KERNEL__*/ |
366 | #endif /*__LINUX_NETFILTER_H*/ |
367 |
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