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> | |
d1c85c2e | 12 | #include <linux/static_key.h> |
607ca46e | 13 | #include <uapi/linux/netfilter.h> |
1da177e4 | 14 | #ifdef CONFIG_NETFILTER |
f615df76 FW |
15 | static inline int NF_DROP_GETERR(int verdict) |
16 | { | |
17 | return -(verdict >> NF_VERDICT_QBITS); | |
18 | } | |
1da177e4 | 19 | |
b8beedd2 PM |
20 | static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
21 | const union nf_inet_addr *a2) | |
22 | { | |
23 | return a1->all[0] == a2->all[0] && | |
24 | a1->all[1] == a2->all[1] && | |
25 | a1->all[2] == a2->all[2] && | |
26 | a1->all[3] == a2->all[3]; | |
27 | } | |
28 | ||
efdedd54 DF |
29 | static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, |
30 | union nf_inet_addr *result, | |
31 | const union nf_inet_addr *mask) | |
32 | { | |
33 | result->all[0] = a1->all[0] & mask->all[0]; | |
34 | result->all[1] = a1->all[1] & mask->all[1]; | |
35 | result->all[2] = a1->all[2] & mask->all[2]; | |
36 | result->all[3] = a1->all[3] & mask->all[3]; | |
37 | } | |
38 | ||
a0f4ecf3 | 39 | int netfilter_init(void); |
1da177e4 LT |
40 | |
41 | /* Largest hook number + 1 */ | |
42 | #define NF_MAX_HOOKS 8 | |
43 | ||
44 | struct sk_buff; | |
1da177e4 | 45 | |
795aa6ef PM |
46 | struct nf_hook_ops; |
47 | typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops, | |
3db05fea | 48 | struct sk_buff *skb, |
1da177e4 LT |
49 | const struct net_device *in, |
50 | const struct net_device *out, | |
51 | int (*okfn)(struct sk_buff *)); | |
52 | ||
d94d9fee | 53 | struct nf_hook_ops { |
1da177e4 LT |
54 | struct list_head list; |
55 | ||
56 | /* User fills in from here down. */ | |
96518518 PM |
57 | nf_hookfn *hook; |
58 | struct module *owner; | |
59 | void *priv; | |
60 | u_int8_t pf; | |
61 | unsigned int hooknum; | |
1da177e4 | 62 | /* Hooks are ordered in ascending priority. */ |
96518518 | 63 | int priority; |
1da177e4 LT |
64 | }; |
65 | ||
d94d9fee | 66 | struct nf_sockopt_ops { |
1da177e4 LT |
67 | struct list_head list; |
68 | ||
76108cea | 69 | u_int8_t pf; |
1da177e4 LT |
70 | |
71 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
72 | int set_optmin; | |
73 | int set_optmax; | |
74 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
c30f540b | 75 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
76 | int (*compat_set)(struct sock *sk, int optval, |
77 | void __user *user, unsigned int len); | |
c30f540b | 78 | #endif |
1da177e4 LT |
79 | int get_optmin; |
80 | int get_optmax; | |
81 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 82 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
83 | int (*compat_get)(struct sock *sk, int optval, |
84 | void __user *user, int *len); | |
c30f540b | 85 | #endif |
16fcec35 NH |
86 | /* Use the module struct to lock set/get code in place */ |
87 | struct module *owner; | |
1da177e4 LT |
88 | }; |
89 | ||
1da177e4 LT |
90 | /* Function to register/unregister hook points. */ |
91 | int nf_register_hook(struct nf_hook_ops *reg); | |
92 | void nf_unregister_hook(struct nf_hook_ops *reg); | |
972d1cb1 PM |
93 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
94 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); | |
1da177e4 LT |
95 | |
96 | /* Functions to register get/setsockopt ranges (non-inclusive). You | |
97 | need to check permissions yourself! */ | |
98 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
99 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
100 | ||
7e9c6eeb | 101 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
1da177e4 | 102 | |
d1c85c2e | 103 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 104 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
d1c85c2e | 105 | |
a2d7ec58 ED |
106 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
107 | { | |
108 | if (__builtin_constant_p(pf) && | |
109 | __builtin_constant_p(hook)) | |
c5905afb | 110 | return static_key_false(&nf_hooks_needed[pf][hook]); |
a2d7ec58 ED |
111 | |
112 | return !list_empty(&nf_hooks[pf][hook]); | |
113 | } | |
114 | #else | |
115 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) | |
116 | { | |
117 | return !list_empty(&nf_hooks[pf][hook]); | |
118 | } | |
119 | #endif | |
120 | ||
76108cea | 121 | int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
16a6677f PM |
122 | struct net_device *indev, struct net_device *outdev, |
123 | int (*okfn)(struct sk_buff *), int thresh); | |
124 | ||
125 | /** | |
126 | * nf_hook_thresh - call a netfilter hook | |
127 | * | |
128 | * Returns 1 if the hook has allowed the packet to pass. The function | |
129 | * okfn must be invoked by the caller in this case. Any other return | |
130 | * value indicates the packet has been consumed by the hook. | |
131 | */ | |
76108cea | 132 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
3db05fea | 133 | struct sk_buff *skb, |
16a6677f PM |
134 | struct net_device *indev, |
135 | struct net_device *outdev, | |
23f3733d | 136 | int (*okfn)(struct sk_buff *), int thresh) |
16a6677f | 137 | { |
a2d7ec58 ED |
138 | if (nf_hooks_active(pf, hook)) |
139 | return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh); | |
140 | return 1; | |
16a6677f PM |
141 | } |
142 | ||
76108cea | 143 | static inline int nf_hook(u_int8_t 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 *)) | |
146 | { | |
23f3733d | 147 | return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN); |
16a6677f | 148 | } |
1da177e4 LT |
149 | |
150 | /* Activate hook; either okfn or kfree_skb called, unless a hook | |
151 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
152 | the consequences). | |
153 | ||
154 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
155 | accepted. | |
156 | */ | |
157 | ||
158 | /* RR: | |
159 | > I don't want nf_hook to return anything because people might forget | |
160 | > about async and trust the return value to mean "packet was ok". | |
161 | ||
162 | AK: | |
163 | Just document it clearly, then you can expect some sense from kernel | |
164 | coders :) | |
165 | */ | |
166 | ||
2249065f JE |
167 | static inline int |
168 | NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
169 | struct net_device *in, struct net_device *out, | |
170 | int (*okfn)(struct sk_buff *), int thresh) | |
171 | { | |
172 | int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh); | |
173 | if (ret == 1) | |
174 | ret = okfn(skb); | |
175 | return ret; | |
176 | } | |
48d5cad8 | 177 | |
2249065f JE |
178 | static inline int |
179 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
180 | struct net_device *in, struct net_device *out, | |
181 | int (*okfn)(struct sk_buff *), bool cond) | |
182 | { | |
4bac6b18 PM |
183 | int ret; |
184 | ||
185 | if (!cond || | |
ac5aa2e3 | 186 | ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1)) |
2249065f JE |
187 | ret = okfn(skb); |
188 | return ret; | |
189 | } | |
1da177e4 | 190 | |
2249065f JE |
191 | static inline int |
192 | NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
193 | struct net_device *in, struct net_device *out, | |
194 | int (*okfn)(struct sk_buff *)) | |
195 | { | |
196 | return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN); | |
197 | } | |
1da177e4 LT |
198 | |
199 | /* Call setsockopt() */ | |
76108cea | 200 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 201 | unsigned int len); |
76108cea | 202 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 203 | int *len); |
c30f540b | 204 | #ifdef CONFIG_COMPAT |
76108cea | 205 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 206 | char __user *opt, unsigned int len); |
76108cea | 207 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 208 | char __user *opt, int *len); |
c30f540b | 209 | #endif |
3fdadf7d | 210 | |
089af26c HW |
211 | /* Call this before modifying an existing packet: ensures it is |
212 | modifiable and linear to the point you care about (writable_len). | |
213 | Returns true or false. */ | |
a0f4ecf3 | 214 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 215 | |
1841a4c7 | 216 | struct flowi; |
02f014d8 | 217 | struct nf_queue_entry; |
c01cd429 | 218 | |
bce8032e PM |
219 | struct nf_afinfo { |
220 | unsigned short family; | |
b51655b9 | 221 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 222 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
223 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
224 | unsigned int hook, | |
225 | unsigned int dataoff, | |
226 | unsigned int len, | |
227 | u_int8_t protocol); | |
31ad3dd6 | 228 | int (*route)(struct net *net, struct dst_entry **dst, |
0fae2e77 | 229 | struct flowi *fl, bool strict); |
bce8032e | 230 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 231 | struct nf_queue_entry *entry); |
3db05fea | 232 | int (*reroute)(struct sk_buff *skb, |
02f014d8 | 233 | const struct nf_queue_entry *entry); |
bce8032e | 234 | int route_key_size; |
2cc7d573 HW |
235 | }; |
236 | ||
0e60ebe0 | 237 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
1e796fda | 238 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
bce8032e PM |
239 | { |
240 | return rcu_dereference(nf_afinfo[family]); | |
241 | } | |
2cc7d573 | 242 | |
b51655b9 | 243 | static inline __sum16 |
422c346f PM |
244 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
245 | u_int8_t protocol, unsigned short family) | |
246 | { | |
1e796fda | 247 | const struct nf_afinfo *afinfo; |
b51655b9 | 248 | __sum16 csum = 0; |
422c346f PM |
249 | |
250 | rcu_read_lock(); | |
251 | afinfo = nf_get_afinfo(family); | |
252 | if (afinfo) | |
253 | csum = afinfo->checksum(skb, hook, dataoff, protocol); | |
254 | rcu_read_unlock(); | |
255 | return csum; | |
256 | } | |
257 | ||
d63a6507 PM |
258 | static inline __sum16 |
259 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, | |
260 | unsigned int dataoff, unsigned int len, | |
261 | u_int8_t protocol, unsigned short family) | |
262 | { | |
263 | const struct nf_afinfo *afinfo; | |
264 | __sum16 csum = 0; | |
265 | ||
266 | rcu_read_lock(); | |
267 | afinfo = nf_get_afinfo(family); | |
268 | if (afinfo) | |
269 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, | |
270 | protocol); | |
271 | rcu_read_unlock(); | |
272 | return csum; | |
273 | } | |
274 | ||
a0f4ecf3 JP |
275 | int nf_register_afinfo(const struct nf_afinfo *afinfo); |
276 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 277 | |
eb9c7ebe | 278 | #include <net/flow.h> |
c7232c99 | 279 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
eb9c7ebe PM |
280 | |
281 | static inline void | |
76108cea | 282 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 283 | { |
051578cc | 284 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
285 | void (*decodefn)(struct sk_buff *, struct flowi *); |
286 | ||
c7232c99 PM |
287 | rcu_read_lock(); |
288 | decodefn = rcu_dereference(nf_nat_decode_session_hook); | |
289 | if (decodefn) | |
290 | decodefn(skb, fl); | |
291 | rcu_read_unlock(); | |
eb9c7ebe PM |
292 | #endif |
293 | } | |
294 | ||
1da177e4 LT |
295 | #else /* !CONFIG_NETFILTER */ |
296 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) | |
48d5cad8 | 297 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb) |
76108cea | 298 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
3db05fea | 299 | struct sk_buff *skb, |
f53b61d8 DM |
300 | struct net_device *indev, |
301 | struct net_device *outdev, | |
23f3733d | 302 | int (*okfn)(struct sk_buff *), int thresh) |
f53b61d8 | 303 | { |
3db05fea | 304 | return okfn(skb); |
f53b61d8 | 305 | } |
76108cea | 306 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
f53b61d8 DM |
307 | struct net_device *indev, struct net_device *outdev, |
308 | int (*okfn)(struct sk_buff *)) | |
309 | { | |
9c92d348 | 310 | return 1; |
f53b61d8 | 311 | } |
f53b61d8 | 312 | struct flowi; |
eb9c7ebe | 313 | static inline void |
76108cea JE |
314 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
315 | { | |
316 | } | |
1da177e4 LT |
317 | #endif /*CONFIG_NETFILTER*/ |
318 | ||
5f79e0f9 | 319 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
312a0c16 | 320 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 321 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
0e60ebe0 | 322 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
9cb01766 PNA |
323 | |
324 | struct nf_conn; | |
41d73ec0 | 325 | enum ip_conntrack_info; |
9cb01766 PNA |
326 | struct nlattr; |
327 | ||
328 | struct nfq_ct_hook { | |
329 | size_t (*build_size)(const struct nf_conn *ct); | |
330 | int (*build)(struct sk_buff *skb, struct nf_conn *ct); | |
331 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); | |
bd077937 PNA |
332 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
333 | u32 portid, u32 report); | |
8c88f87c | 334 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 335 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 336 | }; |
41d73ec0 | 337 | extern struct nfq_ct_hook __rcu *nfq_ct_hook; |
5f79e0f9 YK |
338 | #else |
339 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
340 | #endif | |
341 | ||
1da177e4 | 342 | #endif /*__LINUX_NETFILTER_H*/ |