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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> | |
607ca46e | 12 | #include <uapi/linux/netfilter.h> |
1da177e4 | 13 | #ifdef CONFIG_NETFILTER |
f615df76 FW |
14 | static inline int NF_DROP_GETERR(int verdict) |
15 | { | |
16 | return -(verdict >> NF_VERDICT_QBITS); | |
17 | } | |
1da177e4 | 18 | |
b8beedd2 PM |
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 | ||
efdedd54 DF |
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 | ||
a0f4ecf3 | 38 | int netfilter_init(void); |
1da177e4 LT |
39 | |
40 | /* Largest hook number + 1 */ | |
41 | #define NF_MAX_HOOKS 8 | |
42 | ||
43 | struct sk_buff; | |
1da177e4 | 44 | |
795aa6ef PM |
45 | struct nf_hook_ops; |
46 | typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops, | |
3db05fea | 47 | struct sk_buff *skb, |
1da177e4 LT |
48 | const struct net_device *in, |
49 | const struct net_device *out, | |
50 | int (*okfn)(struct sk_buff *)); | |
51 | ||
d94d9fee | 52 | struct nf_hook_ops { |
1da177e4 LT |
53 | struct list_head list; |
54 | ||
55 | /* User fills in from here down. */ | |
96518518 PM |
56 | nf_hookfn *hook; |
57 | struct module *owner; | |
58 | void *priv; | |
59 | u_int8_t pf; | |
60 | unsigned int hooknum; | |
1da177e4 | 61 | /* Hooks are ordered in ascending priority. */ |
96518518 | 62 | int priority; |
1da177e4 LT |
63 | }; |
64 | ||
d94d9fee | 65 | struct nf_sockopt_ops { |
1da177e4 LT |
66 | struct list_head list; |
67 | ||
76108cea | 68 | u_int8_t pf; |
1da177e4 LT |
69 | |
70 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
71 | int set_optmin; | |
72 | int set_optmax; | |
73 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
c30f540b | 74 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
75 | int (*compat_set)(struct sock *sk, int optval, |
76 | void __user *user, unsigned int len); | |
c30f540b | 77 | #endif |
1da177e4 LT |
78 | int get_optmin; |
79 | int get_optmax; | |
80 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 81 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
82 | int (*compat_get)(struct sock *sk, int optval, |
83 | void __user *user, int *len); | |
c30f540b | 84 | #endif |
16fcec35 NH |
85 | /* Use the module struct to lock set/get code in place */ |
86 | struct module *owner; | |
1da177e4 LT |
87 | }; |
88 | ||
1da177e4 LT |
89 | /* Function to register/unregister hook points. */ |
90 | int nf_register_hook(struct nf_hook_ops *reg); | |
91 | void nf_unregister_hook(struct nf_hook_ops *reg); | |
972d1cb1 PM |
92 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
93 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); | |
1da177e4 LT |
94 | |
95 | /* Functions to register get/setsockopt ranges (non-inclusive). You | |
96 | need to check permissions yourself! */ | |
97 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
98 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
99 | ||
7e9c6eeb | 100 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
1da177e4 | 101 | |
a2d7ec58 | 102 | #if defined(CONFIG_JUMP_LABEL) |
c5905afb IM |
103 | #include <linux/static_key.h> |
104 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; | |
a2d7ec58 ED |
105 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
106 | { | |
107 | if (__builtin_constant_p(pf) && | |
108 | __builtin_constant_p(hook)) | |
c5905afb | 109 | return static_key_false(&nf_hooks_needed[pf][hook]); |
a2d7ec58 ED |
110 | |
111 | return !list_empty(&nf_hooks[pf][hook]); | |
112 | } | |
113 | #else | |
114 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) | |
115 | { | |
116 | return !list_empty(&nf_hooks[pf][hook]); | |
117 | } | |
118 | #endif | |
119 | ||
76108cea | 120 | int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
16a6677f PM |
121 | struct net_device *indev, struct net_device *outdev, |
122 | int (*okfn)(struct sk_buff *), int thresh); | |
123 | ||
124 | /** | |
125 | * nf_hook_thresh - call a netfilter hook | |
126 | * | |
127 | * Returns 1 if the hook has allowed the packet to pass. The function | |
128 | * okfn must be invoked by the caller in this case. Any other return | |
129 | * value indicates the packet has been consumed by the hook. | |
130 | */ | |
76108cea | 131 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
3db05fea | 132 | struct sk_buff *skb, |
16a6677f PM |
133 | struct net_device *indev, |
134 | struct net_device *outdev, | |
23f3733d | 135 | int (*okfn)(struct sk_buff *), int thresh) |
16a6677f | 136 | { |
a2d7ec58 ED |
137 | if (nf_hooks_active(pf, hook)) |
138 | return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh); | |
139 | return 1; | |
16a6677f PM |
140 | } |
141 | ||
76108cea | 142 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
16a6677f PM |
143 | struct net_device *indev, struct net_device *outdev, |
144 | int (*okfn)(struct sk_buff *)) | |
145 | { | |
23f3733d | 146 | return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN); |
16a6677f | 147 | } |
1da177e4 LT |
148 | |
149 | /* Activate hook; either okfn or kfree_skb called, unless a hook | |
150 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
151 | the consequences). | |
152 | ||
153 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
154 | accepted. | |
155 | */ | |
156 | ||
157 | /* RR: | |
158 | > I don't want nf_hook to return anything because people might forget | |
159 | > about async and trust the return value to mean "packet was ok". | |
160 | ||
161 | AK: | |
162 | Just document it clearly, then you can expect some sense from kernel | |
163 | coders :) | |
164 | */ | |
165 | ||
2249065f JE |
166 | static inline int |
167 | NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
168 | struct net_device *in, struct net_device *out, | |
169 | int (*okfn)(struct sk_buff *), int thresh) | |
170 | { | |
171 | int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh); | |
172 | if (ret == 1) | |
173 | ret = okfn(skb); | |
174 | return ret; | |
175 | } | |
48d5cad8 | 176 | |
2249065f JE |
177 | static inline int |
178 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
179 | struct net_device *in, struct net_device *out, | |
180 | int (*okfn)(struct sk_buff *), bool cond) | |
181 | { | |
4bac6b18 PM |
182 | int ret; |
183 | ||
184 | if (!cond || | |
ac5aa2e3 | 185 | ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1)) |
2249065f JE |
186 | ret = okfn(skb); |
187 | return ret; | |
188 | } | |
1da177e4 | 189 | |
2249065f JE |
190 | static inline int |
191 | NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
192 | struct net_device *in, struct net_device *out, | |
193 | int (*okfn)(struct sk_buff *)) | |
194 | { | |
195 | return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN); | |
196 | } | |
1da177e4 LT |
197 | |
198 | /* Call setsockopt() */ | |
76108cea | 199 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 200 | unsigned int len); |
76108cea | 201 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 202 | int *len); |
c30f540b | 203 | #ifdef CONFIG_COMPAT |
76108cea | 204 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 205 | char __user *opt, unsigned int len); |
76108cea | 206 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 207 | char __user *opt, int *len); |
c30f540b | 208 | #endif |
3fdadf7d | 209 | |
089af26c HW |
210 | /* Call this before modifying an existing packet: ensures it is |
211 | modifiable and linear to the point you care about (writable_len). | |
212 | Returns true or false. */ | |
a0f4ecf3 | 213 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 214 | |
1841a4c7 | 215 | struct flowi; |
02f014d8 | 216 | struct nf_queue_entry; |
c01cd429 | 217 | |
bce8032e PM |
218 | struct nf_afinfo { |
219 | unsigned short family; | |
b51655b9 | 220 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 221 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
222 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
223 | unsigned int hook, | |
224 | unsigned int dataoff, | |
225 | unsigned int len, | |
226 | u_int8_t protocol); | |
31ad3dd6 | 227 | int (*route)(struct net *net, struct dst_entry **dst, |
0fae2e77 | 228 | struct flowi *fl, bool strict); |
bce8032e | 229 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 230 | struct nf_queue_entry *entry); |
3db05fea | 231 | int (*reroute)(struct sk_buff *skb, |
02f014d8 | 232 | const struct nf_queue_entry *entry); |
bce8032e | 233 | int route_key_size; |
2cc7d573 HW |
234 | }; |
235 | ||
0e60ebe0 | 236 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
1e796fda | 237 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
bce8032e PM |
238 | { |
239 | return rcu_dereference(nf_afinfo[family]); | |
240 | } | |
2cc7d573 | 241 | |
b51655b9 | 242 | static inline __sum16 |
422c346f PM |
243 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
244 | u_int8_t protocol, unsigned short family) | |
245 | { | |
1e796fda | 246 | const struct nf_afinfo *afinfo; |
b51655b9 | 247 | __sum16 csum = 0; |
422c346f PM |
248 | |
249 | rcu_read_lock(); | |
250 | afinfo = nf_get_afinfo(family); | |
251 | if (afinfo) | |
252 | csum = afinfo->checksum(skb, hook, dataoff, protocol); | |
253 | rcu_read_unlock(); | |
254 | return csum; | |
255 | } | |
256 | ||
d63a6507 PM |
257 | static inline __sum16 |
258 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, | |
259 | unsigned int dataoff, unsigned int len, | |
260 | u_int8_t protocol, unsigned short family) | |
261 | { | |
262 | const struct nf_afinfo *afinfo; | |
263 | __sum16 csum = 0; | |
264 | ||
265 | rcu_read_lock(); | |
266 | afinfo = nf_get_afinfo(family); | |
267 | if (afinfo) | |
268 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, | |
269 | protocol); | |
270 | rcu_read_unlock(); | |
271 | return csum; | |
272 | } | |
273 | ||
a0f4ecf3 JP |
274 | int nf_register_afinfo(const struct nf_afinfo *afinfo); |
275 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 276 | |
eb9c7ebe | 277 | #include <net/flow.h> |
c7232c99 | 278 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
eb9c7ebe PM |
279 | |
280 | static inline void | |
76108cea | 281 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 282 | { |
051578cc | 283 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
284 | void (*decodefn)(struct sk_buff *, struct flowi *); |
285 | ||
c7232c99 PM |
286 | rcu_read_lock(); |
287 | decodefn = rcu_dereference(nf_nat_decode_session_hook); | |
288 | if (decodefn) | |
289 | decodefn(skb, fl); | |
290 | rcu_read_unlock(); | |
eb9c7ebe PM |
291 | #endif |
292 | } | |
293 | ||
1da177e4 LT |
294 | #else /* !CONFIG_NETFILTER */ |
295 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) | |
48d5cad8 | 296 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb) |
76108cea | 297 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
3db05fea | 298 | struct sk_buff *skb, |
f53b61d8 DM |
299 | struct net_device *indev, |
300 | struct net_device *outdev, | |
23f3733d | 301 | int (*okfn)(struct sk_buff *), int thresh) |
f53b61d8 | 302 | { |
3db05fea | 303 | return okfn(skb); |
f53b61d8 | 304 | } |
76108cea | 305 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
f53b61d8 DM |
306 | struct net_device *indev, struct net_device *outdev, |
307 | int (*okfn)(struct sk_buff *)) | |
308 | { | |
9c92d348 | 309 | return 1; |
f53b61d8 | 310 | } |
f53b61d8 | 311 | struct flowi; |
eb9c7ebe | 312 | static inline void |
76108cea JE |
313 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
314 | { | |
315 | } | |
1da177e4 LT |
316 | #endif /*CONFIG_NETFILTER*/ |
317 | ||
5f79e0f9 | 318 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
312a0c16 | 319 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 320 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
0e60ebe0 | 321 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
9cb01766 PNA |
322 | |
323 | struct nf_conn; | |
41d73ec0 | 324 | enum ip_conntrack_info; |
9cb01766 PNA |
325 | struct nlattr; |
326 | ||
327 | struct nfq_ct_hook { | |
328 | size_t (*build_size)(const struct nf_conn *ct); | |
329 | int (*build)(struct sk_buff *skb, struct nf_conn *ct); | |
330 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); | |
bd077937 PNA |
331 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
332 | u32 portid, u32 report); | |
8c88f87c | 333 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 334 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 335 | }; |
41d73ec0 | 336 | extern struct nfq_ct_hook __rcu *nfq_ct_hook; |
5f79e0f9 YK |
337 | #else |
338 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
339 | #endif | |
340 | ||
1da177e4 | 341 | #endif /*__LINUX_NETFILTER_H*/ |