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1 | #ifndef __LINUX_NETFILTER_H |
2 | #define __LINUX_NETFILTER_H |
3 | |
4 | #include <linux/init.h> |
5 | #include <linux/skbuff.h> |
6 | #include <linux/net.h> |
7 | #include <linux/if.h> |
8 | #include <linux/in.h> |
9 | #include <linux/in6.h> |
10 | #include <linux/wait.h> |
11 | #include <linux/list.h> |
12 | #include <uapi/linux/netfilter.h> |
13 | #ifdef CONFIG_NETFILTER |
14 | static inline int NF_DROP_GETERR(int verdict) |
15 | { |
16 | return -(verdict >> NF_VERDICT_QBITS); |
17 | } |
18 | |
19 | static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
20 | const union nf_inet_addr *a2) |
21 | { |
22 | return a1->all[0] == a2->all[0] && |
23 | a1->all[1] == a2->all[1] && |
24 | a1->all[2] == a2->all[2] && |
25 | a1->all[3] == a2->all[3]; |
26 | } |
27 | |
28 | static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, |
29 | union nf_inet_addr *result, |
30 | const union nf_inet_addr *mask) |
31 | { |
32 | result->all[0] = a1->all[0] & mask->all[0]; |
33 | result->all[1] = a1->all[1] & mask->all[1]; |
34 | result->all[2] = a1->all[2] & mask->all[2]; |
35 | result->all[3] = a1->all[3] & mask->all[3]; |
36 | } |
37 | |
38 | extern int netfilter_init(void); |
39 | |
40 | /* Largest hook number + 1 */ |
41 | #define NF_MAX_HOOKS 8 |
42 | |
43 | struct sk_buff; |
44 | |
45 | typedef unsigned int nf_hookfn(unsigned int hooknum, |
46 | struct sk_buff *skb, |
47 | const struct net_device *in, |
48 | const struct net_device *out, |
49 | int (*okfn)(struct sk_buff *)); |
50 | |
51 | struct nf_hook_ops { |
52 | struct list_head list; |
53 | |
54 | /* User fills in from here down. */ |
55 | nf_hookfn *hook; |
56 | struct module *owner; |
57 | u_int8_t pf; |
58 | unsigned int hooknum; |
59 | /* Hooks are ordered in ascending priority. */ |
60 | int priority; |
61 | }; |
62 | |
63 | struct nf_sockopt_ops { |
64 | struct list_head list; |
65 | |
66 | u_int8_t pf; |
67 | |
68 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ |
69 | int set_optmin; |
70 | int set_optmax; |
71 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); |
72 | #ifdef CONFIG_COMPAT |
73 | int (*compat_set)(struct sock *sk, int optval, |
74 | void __user *user, unsigned int len); |
75 | #endif |
76 | int get_optmin; |
77 | int get_optmax; |
78 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); |
79 | #ifdef CONFIG_COMPAT |
80 | int (*compat_get)(struct sock *sk, int optval, |
81 | void __user *user, int *len); |
82 | #endif |
83 | /* Use the module struct to lock set/get code in place */ |
84 | struct module *owner; |
85 | }; |
86 | |
87 | /* Function to register/unregister hook points. */ |
88 | int nf_register_hook(struct nf_hook_ops *reg); |
89 | void nf_unregister_hook(struct nf_hook_ops *reg); |
90 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
91 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); |
92 | |
93 | /* Functions to register get/setsockopt ranges (non-inclusive). You |
94 | need to check permissions yourself! */ |
95 | int nf_register_sockopt(struct nf_sockopt_ops *reg); |
96 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); |
97 | |
98 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
99 | |
100 | #if defined(CONFIG_JUMP_LABEL) |
101 | #include <linux/static_key.h> |
102 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
103 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
104 | { |
105 | if (__builtin_constant_p(pf) && |
106 | __builtin_constant_p(hook)) |
107 | return static_key_false(&nf_hooks_needed[pf][hook]); |
108 | |
109 | return !list_empty(&nf_hooks[pf][hook]); |
110 | } |
111 | #else |
112 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
113 | { |
114 | return !list_empty(&nf_hooks[pf][hook]); |
115 | } |
116 | #endif |
117 | |
118 | int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
119 | struct net_device *indev, struct net_device *outdev, |
120 | int (*okfn)(struct sk_buff *), int thresh); |
121 | |
122 | /** |
123 | * nf_hook_thresh - call a netfilter hook |
124 | * |
125 | * Returns 1 if the hook has allowed the packet to pass. The function |
126 | * okfn must be invoked by the caller in this case. Any other return |
127 | * value indicates the packet has been consumed by the hook. |
128 | */ |
129 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
130 | struct sk_buff *skb, |
131 | struct net_device *indev, |
132 | struct net_device *outdev, |
133 | int (*okfn)(struct sk_buff *), int thresh) |
134 | { |
135 | if (nf_hooks_active(pf, hook)) |
136 | return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh); |
137 | return 1; |
138 | } |
139 | |
140 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
141 | struct net_device *indev, struct net_device *outdev, |
142 | int (*okfn)(struct sk_buff *)) |
143 | { |
144 | return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN); |
145 | } |
146 | |
147 | /* Activate hook; either okfn or kfree_skb called, unless a hook |
148 | returns NF_STOLEN (in which case, it's up to the hook to deal with |
149 | the consequences). |
150 | |
151 | Returns -ERRNO if packet dropped. Zero means queued, stolen or |
152 | accepted. |
153 | */ |
154 | |
155 | /* RR: |
156 | > I don't want nf_hook to return anything because people might forget |
157 | > about async and trust the return value to mean "packet was ok". |
158 | |
159 | AK: |
160 | Just document it clearly, then you can expect some sense from kernel |
161 | coders :) |
162 | */ |
163 | |
164 | static inline int |
165 | NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
166 | struct net_device *in, struct net_device *out, |
167 | int (*okfn)(struct sk_buff *), int thresh) |
168 | { |
169 | int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh); |
170 | if (ret == 1) |
171 | ret = okfn(skb); |
172 | return ret; |
173 | } |
174 | |
175 | static inline int |
176 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
177 | struct net_device *in, struct net_device *out, |
178 | int (*okfn)(struct sk_buff *), bool cond) |
179 | { |
180 | int ret; |
181 | |
182 | if (!cond || |
183 | ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1)) |
184 | ret = okfn(skb); |
185 | return ret; |
186 | } |
187 | |
188 | static inline int |
189 | NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
190 | struct net_device *in, struct net_device *out, |
191 | int (*okfn)(struct sk_buff *)) |
192 | { |
193 | return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN); |
194 | } |
195 | |
196 | /* Call setsockopt() */ |
197 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
198 | unsigned int len); |
199 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
200 | int *len); |
201 | #ifdef CONFIG_COMPAT |
202 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
203 | char __user *opt, unsigned int len); |
204 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
205 | char __user *opt, int *len); |
206 | #endif |
207 | |
208 | /* Call this before modifying an existing packet: ensures it is |
209 | modifiable and linear to the point you care about (writable_len). |
210 | Returns true or false. */ |
211 | extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
212 | |
213 | struct flowi; |
214 | struct nf_queue_entry; |
215 | |
216 | struct nf_afinfo { |
217 | unsigned short family; |
218 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
219 | unsigned int dataoff, u_int8_t protocol); |
220 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
221 | unsigned int hook, |
222 | unsigned int dataoff, |
223 | unsigned int len, |
224 | u_int8_t protocol); |
225 | int (*route)(struct net *net, struct dst_entry **dst, |
226 | struct flowi *fl, bool strict); |
227 | void (*saveroute)(const struct sk_buff *skb, |
228 | struct nf_queue_entry *entry); |
229 | int (*reroute)(struct sk_buff *skb, |
230 | const struct nf_queue_entry *entry); |
231 | int route_key_size; |
232 | }; |
233 | |
234 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
235 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
236 | { |
237 | return rcu_dereference(nf_afinfo[family]); |
238 | } |
239 | |
240 | static inline __sum16 |
241 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
242 | u_int8_t protocol, unsigned short family) |
243 | { |
244 | const struct nf_afinfo *afinfo; |
245 | __sum16 csum = 0; |
246 | |
247 | rcu_read_lock(); |
248 | afinfo = nf_get_afinfo(family); |
249 | if (afinfo) |
250 | csum = afinfo->checksum(skb, hook, dataoff, protocol); |
251 | rcu_read_unlock(); |
252 | return csum; |
253 | } |
254 | |
255 | static inline __sum16 |
256 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, |
257 | unsigned int dataoff, unsigned int len, |
258 | u_int8_t protocol, unsigned short family) |
259 | { |
260 | const struct nf_afinfo *afinfo; |
261 | __sum16 csum = 0; |
262 | |
263 | rcu_read_lock(); |
264 | afinfo = nf_get_afinfo(family); |
265 | if (afinfo) |
266 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, |
267 | protocol); |
268 | rcu_read_unlock(); |
269 | return csum; |
270 | } |
271 | |
272 | extern int nf_register_afinfo(const struct nf_afinfo *afinfo); |
273 | extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo); |
274 | |
275 | #include <net/flow.h> |
276 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
277 | |
278 | static inline void |
279 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
280 | { |
281 | #ifdef CONFIG_NF_NAT_NEEDED |
282 | void (*decodefn)(struct sk_buff *, struct flowi *); |
283 | |
284 | rcu_read_lock(); |
285 | decodefn = rcu_dereference(nf_nat_decode_session_hook); |
286 | if (decodefn) |
287 | decodefn(skb, fl); |
288 | rcu_read_unlock(); |
289 | #endif |
290 | } |
291 | |
292 | #else /* !CONFIG_NETFILTER */ |
293 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) |
294 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb) |
295 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
296 | struct sk_buff *skb, |
297 | struct net_device *indev, |
298 | struct net_device *outdev, |
299 | int (*okfn)(struct sk_buff *), int thresh) |
300 | { |
301 | return okfn(skb); |
302 | } |
303 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
304 | struct net_device *indev, struct net_device *outdev, |
305 | int (*okfn)(struct sk_buff *)) |
306 | { |
307 | return 1; |
308 | } |
309 | struct flowi; |
310 | static inline void |
311 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
312 | { |
313 | } |
314 | #endif /*CONFIG_NETFILTER*/ |
315 | |
316 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
317 | extern void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *) __rcu; |
318 | extern void nf_ct_attach(struct sk_buff *, struct sk_buff *); |
319 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
320 | |
321 | struct nf_conn; |
322 | struct nlattr; |
323 | |
324 | struct nfq_ct_hook { |
325 | size_t (*build_size)(const struct nf_conn *ct); |
326 | int (*build)(struct sk_buff *skb, struct nf_conn *ct); |
327 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); |
328 | }; |
329 | extern struct nfq_ct_hook __rcu *nfq_ct_hook; |
330 | |
331 | struct nfq_ct_nat_hook { |
332 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
333 | u32 ctinfo, int off); |
334 | }; |
335 | extern struct nfq_ct_nat_hook __rcu *nfq_ct_nat_hook; |
336 | #else |
337 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} |
338 | #endif |
339 | |
340 | #endif /*__LINUX_NETFILTER_H*/ |
341 |
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