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> | |
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 | 46 | struct nf_hook_ops; |
cfdfab31 DM |
47 | |
48 | struct nf_hook_state { | |
49 | unsigned int hook; | |
50 | int thresh; | |
51 | u_int8_t pf; | |
52 | struct net_device *in; | |
53 | struct net_device *out; | |
54 | int (*okfn)(struct sk_buff *); | |
55 | }; | |
56 | ||
795aa6ef | 57 | typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops, |
3db05fea | 58 | struct sk_buff *skb, |
1da177e4 LT |
59 | const struct net_device *in, |
60 | const struct net_device *out, | |
61 | int (*okfn)(struct sk_buff *)); | |
62 | ||
d94d9fee | 63 | struct nf_hook_ops { |
1da177e4 LT |
64 | struct list_head list; |
65 | ||
66 | /* User fills in from here down. */ | |
96518518 PM |
67 | nf_hookfn *hook; |
68 | struct module *owner; | |
69 | void *priv; | |
70 | u_int8_t pf; | |
71 | unsigned int hooknum; | |
1da177e4 | 72 | /* Hooks are ordered in ascending priority. */ |
96518518 | 73 | int priority; |
1da177e4 LT |
74 | }; |
75 | ||
d94d9fee | 76 | struct nf_sockopt_ops { |
1da177e4 LT |
77 | struct list_head list; |
78 | ||
76108cea | 79 | u_int8_t pf; |
1da177e4 LT |
80 | |
81 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ | |
82 | int set_optmin; | |
83 | int set_optmax; | |
84 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); | |
c30f540b | 85 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
86 | int (*compat_set)(struct sock *sk, int optval, |
87 | void __user *user, unsigned int len); | |
c30f540b | 88 | #endif |
1da177e4 LT |
89 | int get_optmin; |
90 | int get_optmax; | |
91 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); | |
c30f540b | 92 | #ifdef CONFIG_COMPAT |
3fdadf7d DM |
93 | int (*compat_get)(struct sock *sk, int optval, |
94 | void __user *user, int *len); | |
c30f540b | 95 | #endif |
16fcec35 NH |
96 | /* Use the module struct to lock set/get code in place */ |
97 | struct module *owner; | |
1da177e4 LT |
98 | }; |
99 | ||
1da177e4 LT |
100 | /* Function to register/unregister hook points. */ |
101 | int nf_register_hook(struct nf_hook_ops *reg); | |
102 | void nf_unregister_hook(struct nf_hook_ops *reg); | |
972d1cb1 PM |
103 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
104 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); | |
1da177e4 LT |
105 | |
106 | /* Functions to register get/setsockopt ranges (non-inclusive). You | |
107 | need to check permissions yourself! */ | |
108 | int nf_register_sockopt(struct nf_sockopt_ops *reg); | |
109 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); | |
110 | ||
7e9c6eeb | 111 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
1da177e4 | 112 | |
d1c85c2e | 113 | #ifdef HAVE_JUMP_LABEL |
c5905afb | 114 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
d1c85c2e | 115 | |
a2d7ec58 ED |
116 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
117 | { | |
118 | if (__builtin_constant_p(pf) && | |
119 | __builtin_constant_p(hook)) | |
c5905afb | 120 | return static_key_false(&nf_hooks_needed[pf][hook]); |
a2d7ec58 ED |
121 | |
122 | return !list_empty(&nf_hooks[pf][hook]); | |
123 | } | |
124 | #else | |
125 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) | |
126 | { | |
127 | return !list_empty(&nf_hooks[pf][hook]); | |
128 | } | |
129 | #endif | |
130 | ||
cfdfab31 | 131 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state); |
16a6677f PM |
132 | |
133 | /** | |
134 | * nf_hook_thresh - call a netfilter hook | |
135 | * | |
136 | * Returns 1 if the hook has allowed the packet to pass. The function | |
137 | * okfn must be invoked by the caller in this case. Any other return | |
138 | * value indicates the packet has been consumed by the hook. | |
139 | */ | |
76108cea | 140 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
3db05fea | 141 | struct sk_buff *skb, |
16a6677f PM |
142 | struct net_device *indev, |
143 | struct net_device *outdev, | |
23f3733d | 144 | int (*okfn)(struct sk_buff *), int thresh) |
16a6677f | 145 | { |
cfdfab31 DM |
146 | if (nf_hooks_active(pf, hook)) { |
147 | struct nf_hook_state state = { | |
148 | .hook = hook, | |
149 | .thresh = thresh, | |
150 | .pf = pf, | |
151 | .in = indev, | |
152 | .out = outdev, | |
153 | .okfn = okfn | |
154 | }; | |
155 | ||
156 | return nf_hook_slow(skb, &state); | |
157 | } | |
a2d7ec58 | 158 | return 1; |
16a6677f PM |
159 | } |
160 | ||
76108cea | 161 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
16a6677f PM |
162 | struct net_device *indev, struct net_device *outdev, |
163 | int (*okfn)(struct sk_buff *)) | |
164 | { | |
23f3733d | 165 | return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN); |
16a6677f | 166 | } |
1da177e4 LT |
167 | |
168 | /* Activate hook; either okfn or kfree_skb called, unless a hook | |
169 | returns NF_STOLEN (in which case, it's up to the hook to deal with | |
170 | the consequences). | |
171 | ||
172 | Returns -ERRNO if packet dropped. Zero means queued, stolen or | |
173 | accepted. | |
174 | */ | |
175 | ||
176 | /* RR: | |
177 | > I don't want nf_hook to return anything because people might forget | |
178 | > about async and trust the return value to mean "packet was ok". | |
179 | ||
180 | AK: | |
181 | Just document it clearly, then you can expect some sense from kernel | |
182 | coders :) | |
183 | */ | |
184 | ||
2249065f JE |
185 | static inline int |
186 | NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
187 | struct net_device *in, struct net_device *out, | |
188 | int (*okfn)(struct sk_buff *), int thresh) | |
189 | { | |
190 | int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh); | |
191 | if (ret == 1) | |
192 | ret = okfn(skb); | |
193 | return ret; | |
194 | } | |
48d5cad8 | 195 | |
2249065f JE |
196 | static inline int |
197 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
198 | struct net_device *in, struct net_device *out, | |
199 | int (*okfn)(struct sk_buff *), bool cond) | |
200 | { | |
4bac6b18 PM |
201 | int ret; |
202 | ||
203 | if (!cond || | |
ac5aa2e3 | 204 | ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1)) |
2249065f JE |
205 | ret = okfn(skb); |
206 | return ret; | |
207 | } | |
1da177e4 | 208 | |
2249065f JE |
209 | static inline int |
210 | NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb, | |
211 | struct net_device *in, struct net_device *out, | |
212 | int (*okfn)(struct sk_buff *)) | |
213 | { | |
214 | return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN); | |
215 | } | |
1da177e4 LT |
216 | |
217 | /* Call setsockopt() */ | |
76108cea | 218 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
b7058842 | 219 | unsigned int len); |
76108cea | 220 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
1da177e4 | 221 | int *len); |
c30f540b | 222 | #ifdef CONFIG_COMPAT |
76108cea | 223 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
b7058842 | 224 | char __user *opt, unsigned int len); |
76108cea | 225 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
3fdadf7d | 226 | char __user *opt, int *len); |
c30f540b | 227 | #endif |
3fdadf7d | 228 | |
089af26c HW |
229 | /* Call this before modifying an existing packet: ensures it is |
230 | modifiable and linear to the point you care about (writable_len). | |
231 | Returns true or false. */ | |
a0f4ecf3 | 232 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
089af26c | 233 | |
1841a4c7 | 234 | struct flowi; |
02f014d8 | 235 | struct nf_queue_entry; |
c01cd429 | 236 | |
bce8032e PM |
237 | struct nf_afinfo { |
238 | unsigned short family; | |
b51655b9 | 239 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
422c346f | 240 | unsigned int dataoff, u_int8_t protocol); |
d63a6507 PM |
241 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
242 | unsigned int hook, | |
243 | unsigned int dataoff, | |
244 | unsigned int len, | |
245 | u_int8_t protocol); | |
31ad3dd6 | 246 | int (*route)(struct net *net, struct dst_entry **dst, |
0fae2e77 | 247 | struct flowi *fl, bool strict); |
bce8032e | 248 | void (*saveroute)(const struct sk_buff *skb, |
02f014d8 | 249 | struct nf_queue_entry *entry); |
3db05fea | 250 | int (*reroute)(struct sk_buff *skb, |
02f014d8 | 251 | const struct nf_queue_entry *entry); |
bce8032e | 252 | int route_key_size; |
2cc7d573 HW |
253 | }; |
254 | ||
0e60ebe0 | 255 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
1e796fda | 256 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
bce8032e PM |
257 | { |
258 | return rcu_dereference(nf_afinfo[family]); | |
259 | } | |
2cc7d573 | 260 | |
b51655b9 | 261 | static inline __sum16 |
422c346f PM |
262 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
263 | u_int8_t protocol, unsigned short family) | |
264 | { | |
1e796fda | 265 | const struct nf_afinfo *afinfo; |
b51655b9 | 266 | __sum16 csum = 0; |
422c346f PM |
267 | |
268 | rcu_read_lock(); | |
269 | afinfo = nf_get_afinfo(family); | |
270 | if (afinfo) | |
271 | csum = afinfo->checksum(skb, hook, dataoff, protocol); | |
272 | rcu_read_unlock(); | |
273 | return csum; | |
274 | } | |
275 | ||
d63a6507 PM |
276 | static inline __sum16 |
277 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, | |
278 | unsigned int dataoff, unsigned int len, | |
279 | u_int8_t protocol, unsigned short family) | |
280 | { | |
281 | const struct nf_afinfo *afinfo; | |
282 | __sum16 csum = 0; | |
283 | ||
284 | rcu_read_lock(); | |
285 | afinfo = nf_get_afinfo(family); | |
286 | if (afinfo) | |
287 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, | |
288 | protocol); | |
289 | rcu_read_unlock(); | |
290 | return csum; | |
291 | } | |
292 | ||
a0f4ecf3 JP |
293 | int nf_register_afinfo(const struct nf_afinfo *afinfo); |
294 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo); | |
bce8032e | 295 | |
eb9c7ebe | 296 | #include <net/flow.h> |
c7232c99 | 297 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
eb9c7ebe PM |
298 | |
299 | static inline void | |
76108cea | 300 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
eb9c7ebe | 301 | { |
051578cc | 302 | #ifdef CONFIG_NF_NAT_NEEDED |
eb9c7ebe PM |
303 | void (*decodefn)(struct sk_buff *, struct flowi *); |
304 | ||
c7232c99 PM |
305 | rcu_read_lock(); |
306 | decodefn = rcu_dereference(nf_nat_decode_session_hook); | |
307 | if (decodefn) | |
308 | decodefn(skb, fl); | |
309 | rcu_read_unlock(); | |
eb9c7ebe PM |
310 | #endif |
311 | } | |
312 | ||
1da177e4 LT |
313 | #else /* !CONFIG_NETFILTER */ |
314 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) | |
48d5cad8 | 315 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb) |
76108cea | 316 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
3db05fea | 317 | struct sk_buff *skb, |
f53b61d8 DM |
318 | struct net_device *indev, |
319 | struct net_device *outdev, | |
23f3733d | 320 | int (*okfn)(struct sk_buff *), int thresh) |
f53b61d8 | 321 | { |
3db05fea | 322 | return okfn(skb); |
f53b61d8 | 323 | } |
76108cea | 324 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
f53b61d8 DM |
325 | struct net_device *indev, struct net_device *outdev, |
326 | int (*okfn)(struct sk_buff *)) | |
327 | { | |
9c92d348 | 328 | return 1; |
f53b61d8 | 329 | } |
f53b61d8 | 330 | struct flowi; |
eb9c7ebe | 331 | static inline void |
76108cea JE |
332 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
333 | { | |
334 | } | |
1da177e4 LT |
335 | #endif /*CONFIG_NETFILTER*/ |
336 | ||
5f79e0f9 | 337 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
312a0c16 | 338 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
a0f4ecf3 | 339 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
0e60ebe0 | 340 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
9cb01766 PNA |
341 | |
342 | struct nf_conn; | |
41d73ec0 | 343 | enum ip_conntrack_info; |
9cb01766 PNA |
344 | struct nlattr; |
345 | ||
346 | struct nfq_ct_hook { | |
347 | size_t (*build_size)(const struct nf_conn *ct); | |
348 | int (*build)(struct sk_buff *skb, struct nf_conn *ct); | |
349 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); | |
bd077937 PNA |
350 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
351 | u32 portid, u32 report); | |
8c88f87c | 352 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
41d73ec0 | 353 | enum ip_conntrack_info ctinfo, s32 off); |
9cb01766 | 354 | }; |
41d73ec0 | 355 | extern struct nfq_ct_hook __rcu *nfq_ct_hook; |
5f79e0f9 YK |
356 | #else |
357 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} | |
358 | #endif | |
359 | ||
1da177e4 | 360 | #endif /*__LINUX_NETFILTER_H*/ |