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> | |
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 | ||
6d11cfdb | 38 | extern int netfilter_init(void); |
1da177e4 LT |
39 | |
40 | /* Largest hook number + 1 */ | |
41 | #define NF_MAX_HOOKS 8 | |
42 | ||
43 | struct sk_buff; | |
1da177e4 LT |
44 | |
45 | typedef unsigned int nf_hookfn(unsigned int hooknum, | |
3db05fea | 46 | struct sk_buff *skb, |
1da177e4 LT |
47 | const struct net_device *in, |
48 | const struct net_device *out, | |
49 | int (*okfn)(struct sk_buff *)); | |
50 | ||
d94d9fee | 51 | struct nf_hook_ops { |
1da177e4 LT |
52 | struct list_head list; |
53 | ||
54 | /* User fills in from here down. */ | |
55 | nf_hookfn *hook; | |
56 | struct module *owner; | |
76108cea JE |
57 | u_int8_t pf; |
58 | unsigned int hooknum; | |
1da177e4 LT |
59 | /* Hooks are ordered in ascending priority. */ |
60 | int priority; | |
61 | }; | |
62 | ||
d94d9fee | 63 | struct nf_sockopt_ops { |
1da177e4 LT |
64 | struct list_head list; |
65 | ||
76108cea | 66 | u_int8_t pf; |
1da177e4 LT |
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); | |
c30f540b | 72 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
73 | int (*compat_set)(struct sock *sk, int optval, |
74 | void __user *user, unsigned int len); | |
c30f540b | 75 | #endif |
1da177e4 LT |
76 | int get_optmin; |
77 | int get_optmax; | |
78 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 79 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
80 | int (*compat_get)(struct sock *sk, int optval, |
81 | void __user *user, int *len); | |
c30f540b | 82 | #endif |
16fcec35 NH |
83 | /* Use the module struct to lock set/get code in place */ |
84 | struct module *owner; | |
1da177e4 LT |
85 | }; |
86 | ||
1da177e4 LT |
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); | |
972d1cb1 PM |
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); | |
1da177e4 LT |
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 | ||
7e9c6eeb | 98 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
1da177e4 | 99 | |
a2d7ec58 | 100 | #if defined(CONFIG_JUMP_LABEL) |
c5905afb IM |
101 | #include <linux/static_key.h> |
102 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; | |
a2d7ec58 ED |
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)) | |
c5905afb | 107 | return static_key_false(&nf_hooks_needed[pf][hook]); |
a2d7ec58 ED |
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 | ||
76108cea | 118 | int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
16a6677f PM |
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 | */ | |
76108cea | 129 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
3db05fea | 130 | struct sk_buff *skb, |
16a6677f PM |
131 | struct net_device *indev, |
132 | struct net_device *outdev, | |
23f3733d | 133 | int (*okfn)(struct sk_buff *), int thresh) |
16a6677f | 134 | { |
a2d7ec58 ED |
135 | if (nf_hooks_active(pf, hook)) |
136 | return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh); | |
137 | return 1; | |
16a6677f PM |
138 | } |
139 | ||
76108cea | 140 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
16a6677f PM |
141 | struct net_device *indev, struct net_device *outdev, |
142 | int (*okfn)(struct sk_buff *)) | |
143 | { | |
23f3733d | 144 | return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN); |
16a6677f | 145 | } |
1da177e4 LT |
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 | ||
2249065f JE |
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 | } | |
48d5cad8 | 174 | |
2249065f JE |
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 | { | |
4bac6b18 PM |
180 | int ret; |
181 | ||
182 | if (!cond || | |
ac5aa2e3 | 183 | ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1)) |
2249065f JE |
184 | ret = okfn(skb); |
185 | return ret; | |
186 | } | |
1da177e4 | 187 | |
2249065f JE |
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 | } | |
1da177e4 LT |
195 | |
196 | /* Call setsockopt() */ | |
76108cea | 197 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 198 | unsigned int len); |
76108cea | 199 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 200 | int *len); |
c30f540b | 201 | #ifdef CONFIG_COMPAT |
76108cea | 202 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 203 | char __user *opt, unsigned int len); |
76108cea | 204 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 205 | char __user *opt, int *len); |
c30f540b | 206 | #endif |
3fdadf7d | 207 | |
089af26c HW |
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. */ | |
37d41879 | 211 | extern int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 212 | |
1841a4c7 | 213 | struct flowi; |
02f014d8 | 214 | struct nf_queue_entry; |
c01cd429 | 215 | |
bce8032e PM |
216 | struct nf_afinfo { |
217 | unsigned short family; | |
b51655b9 | 218 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 219 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
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); | |
31ad3dd6 | 225 | int (*route)(struct net *net, struct dst_entry **dst, |
0fae2e77 | 226 | struct flowi *fl, bool strict); |
bce8032e | 227 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 228 | struct nf_queue_entry *entry); |
3db05fea | 229 | int (*reroute)(struct sk_buff *skb, |
02f014d8 | 230 | const struct nf_queue_entry *entry); |
bce8032e | 231 | int route_key_size; |
2cc7d573 HW |
232 | }; |
233 | ||
0e60ebe0 | 234 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
1e796fda | 235 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
bce8032e PM |
236 | { |
237 | return rcu_dereference(nf_afinfo[family]); | |
238 | } | |
2cc7d573 | 239 | |
b51655b9 | 240 | static inline __sum16 |
422c346f PM |
241 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
242 | u_int8_t protocol, unsigned short family) | |
243 | { | |
1e796fda | 244 | const struct nf_afinfo *afinfo; |
b51655b9 | 245 | __sum16 csum = 0; |
422c346f PM |
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 | ||
d63a6507 PM |
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 | ||
1e796fda PM |
272 | extern int nf_register_afinfo(const struct nf_afinfo *afinfo); |
273 | extern void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 274 | |
eb9c7ebe | 275 | #include <net/flow.h> |
c7232c99 | 276 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
eb9c7ebe PM |
277 | |
278 | static inline void | |
76108cea | 279 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 280 | { |
051578cc | 281 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
282 | void (*decodefn)(struct sk_buff *, struct flowi *); |
283 | ||
c7232c99 PM |
284 | rcu_read_lock(); |
285 | decodefn = rcu_dereference(nf_nat_decode_session_hook); | |
286 | if (decodefn) | |
287 | decodefn(skb, fl); | |
288 | rcu_read_unlock(); | |
eb9c7ebe PM |
289 | #endif |
290 | } | |
291 | ||
1da177e4 LT |
292 | #else /* !CONFIG_NETFILTER */ |
293 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) | |
48d5cad8 | 294 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb) |
76108cea | 295 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
3db05fea | 296 | struct sk_buff *skb, |
f53b61d8 DM |
297 | struct net_device *indev, |
298 | struct net_device *outdev, | |
23f3733d | 299 | int (*okfn)(struct sk_buff *), int thresh) |
f53b61d8 | 300 | { |
3db05fea | 301 | return okfn(skb); |
f53b61d8 | 302 | } |
76108cea | 303 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
f53b61d8 DM |
304 | struct net_device *indev, struct net_device *outdev, |
305 | int (*okfn)(struct sk_buff *)) | |
306 | { | |
9c92d348 | 307 | return 1; |
f53b61d8 | 308 | } |
f53b61d8 | 309 | struct flowi; |
eb9c7ebe | 310 | static inline void |
76108cea JE |
311 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
312 | { | |
313 | } | |
1da177e4 LT |
314 | #endif /*CONFIG_NETFILTER*/ |
315 | ||
5f79e0f9 | 316 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
312a0c16 PM |
317 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
318 | extern void nf_ct_attach(struct sk_buff *, const struct sk_buff *); | |
0e60ebe0 | 319 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
9cb01766 PNA |
320 | |
321 | struct nf_conn; | |
41d73ec0 | 322 | enum ip_conntrack_info; |
9cb01766 PNA |
323 | struct nlattr; |
324 | ||
325 | struct nfq_ct_hook { | |
326 | size_t (*build_size)(const struct nf_conn *ct); | |
327 | int (*build)(struct sk_buff *skb, struct nf_conn *ct); | |
328 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); | |
bd077937 PNA |
329 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
330 | u32 portid, u32 report); | |
8c88f87c | 331 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 332 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 333 | }; |
41d73ec0 | 334 | extern struct nfq_ct_hook __rcu *nfq_ct_hook; |
5f79e0f9 YK |
335 | #else |
336 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
337 | #endif | |
338 | ||
1da177e4 | 339 | #endif /*__LINUX_NETFILTER_H*/ |