1
2#ifndef __LINUX_NETFILTER_H
3#define __LINUX_NETFILTER_H
4
5#include <linux/init.h>
6#include <linux/skbuff.h>
7#include <linux/net.h>
8#include <linux/if.h>
9#include <linux/in.h>
10#include <linux/in6.h>
11#include <linux/wait.h>
12#include <linux/list.h>
13#include <linux/static_key.h>
14#include <linux/netfilter_defs.h>
15#include <linux/netdevice.h>
16#include <net/net_namespace.h>
17
18#ifdef CONFIG_NETFILTER
19static inline int NF_DROP_GETERR(int verdict)
20{
21 return -(verdict >> NF_VERDICT_QBITS);
22}
23
24static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
25 const union nf_inet_addr *a2)
26{
27 return a1->all[0] == a2->all[0] &&
28 a1->all[1] == a2->all[1] &&
29 a1->all[2] == a2->all[2] &&
30 a1->all[3] == a2->all[3];
31}
32
33static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
34 union nf_inet_addr *result,
35 const union nf_inet_addr *mask)
36{
37 result->all[0] = a1->all[0] & mask->all[0];
38 result->all[1] = a1->all[1] & mask->all[1];
39 result->all[2] = a1->all[2] & mask->all[2];
40 result->all[3] = a1->all[3] & mask->all[3];
41}
42
43int netfilter_init(void);
44
45struct sk_buff;
46
47struct nf_hook_ops;
48
49struct sock;
50
51struct nf_hook_state {
52 unsigned int hook;
53 u_int8_t pf;
54 struct net_device *in;
55 struct net_device *out;
56 struct sock *sk;
57 struct net *net;
58 int (*okfn)(struct net *, struct sock *, struct sk_buff *);
59};
60
61typedef unsigned int nf_hookfn(void *priv,
62 struct sk_buff *skb,
63 const struct nf_hook_state *state);
64struct nf_hook_ops {
65
66 nf_hookfn *hook;
67 struct net_device *dev;
68 void *priv;
69 u_int8_t pf;
70 unsigned int hooknum;
71
72 int priority;
73};
74
75struct nf_hook_entry {
76 nf_hookfn *hook;
77 void *priv;
78};
79
80struct nf_hook_entries {
81 u16 num_hook_entries;
82
83 struct nf_hook_entry hooks[];
84
85
86
87
88
89
90
91
92};
93
94static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e)
95{
96 unsigned int n = e->num_hook_entries;
97 const void *hook_end;
98
99 hook_end = &e->hooks[n];
100
101 return (struct nf_hook_ops **)hook_end;
102}
103
104static inline int
105nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb,
106 struct nf_hook_state *state)
107{
108 return entry->hook(entry->priv, skb, state);
109}
110
111static inline void nf_hook_state_init(struct nf_hook_state *p,
112 unsigned int hook,
113 u_int8_t pf,
114 struct net_device *indev,
115 struct net_device *outdev,
116 struct sock *sk,
117 struct net *net,
118 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
119{
120 p->hook = hook;
121 p->pf = pf;
122 p->in = indev;
123 p->out = outdev;
124 p->sk = sk;
125 p->net = net;
126 p->okfn = okfn;
127}
128
129
130
131struct nf_sockopt_ops {
132 struct list_head list;
133
134 u_int8_t pf;
135
136
137 int set_optmin;
138 int set_optmax;
139 int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
140#ifdef CONFIG_COMPAT
141 int (*compat_set)(struct sock *sk, int optval,
142 void __user *user, unsigned int len);
143#endif
144 int get_optmin;
145 int get_optmax;
146 int (*get)(struct sock *sk, int optval, void __user *user, int *len);
147#ifdef CONFIG_COMPAT
148 int (*compat_get)(struct sock *sk, int optval,
149 void __user *user, int *len);
150#endif
151
152 struct module *owner;
153};
154
155
156int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops);
157void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops);
158int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
159 unsigned int n);
160void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
161 unsigned int n);
162
163
164
165int nf_register_sockopt(struct nf_sockopt_ops *reg);
166void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
167
168#ifdef HAVE_JUMP_LABEL
169extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
170#endif
171
172int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
173 const struct nf_hook_entries *e, unsigned int i);
174
175
176
177
178
179
180
181
182static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
183 struct sock *sk, struct sk_buff *skb,
184 struct net_device *indev, struct net_device *outdev,
185 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
186{
187 struct nf_hook_entries *hook_head;
188 int ret = 1;
189
190#ifdef HAVE_JUMP_LABEL
191 if (__builtin_constant_p(pf) &&
192 __builtin_constant_p(hook) &&
193 !static_key_false(&nf_hooks_needed[pf][hook]))
194 return 1;
195#endif
196
197 rcu_read_lock();
198 hook_head = rcu_dereference(net->nf.hooks[pf][hook]);
199 if (hook_head) {
200 struct nf_hook_state state;
201
202 nf_hook_state_init(&state, hook, pf, indev, outdev,
203 sk, net, okfn);
204
205 ret = nf_hook_slow(skb, &state, hook_head, 0);
206 }
207 rcu_read_unlock();
208
209 return ret;
210}
211
212
213
214
215
216
217
218
219
220
221
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224
225
226
227
228
229static inline int
230NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
231 struct sk_buff *skb, struct net_device *in, struct net_device *out,
232 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
233 bool cond)
234{
235 int ret;
236
237 if (!cond ||
238 ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1))
239 ret = okfn(net, sk, skb);
240 return ret;
241}
242
243static inline int
244NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb,
245 struct net_device *in, struct net_device *out,
246 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
247{
248 int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
249 if (ret == 1)
250 ret = okfn(net, sk, skb);
251 return ret;
252}
253
254
255int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
256 unsigned int len);
257int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
258 int *len);
259#ifdef CONFIG_COMPAT
260int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
261 char __user *opt, unsigned int len);
262int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
263 char __user *opt, int *len);
264#endif
265
266
267
268
269int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
270
271struct flowi;
272struct nf_queue_entry;
273
274struct nf_afinfo {
275 unsigned short family;
276 __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
277 unsigned int dataoff, u_int8_t protocol);
278 __sum16 (*checksum_partial)(struct sk_buff *skb,
279 unsigned int hook,
280 unsigned int dataoff,
281 unsigned int len,
282 u_int8_t protocol);
283 int (*route)(struct net *net, struct dst_entry **dst,
284 struct flowi *fl, bool strict);
285 void (*saveroute)(const struct sk_buff *skb,
286 struct nf_queue_entry *entry);
287 int (*reroute)(struct net *net, struct sk_buff *skb,
288 const struct nf_queue_entry *entry);
289 int route_key_size;
290};
291
292extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
293static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
294{
295 return rcu_dereference(nf_afinfo[family]);
296}
297
298static inline __sum16
299nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
300 u_int8_t protocol, unsigned short family)
301{
302 const struct nf_afinfo *afinfo;
303 __sum16 csum = 0;
304
305 rcu_read_lock();
306 afinfo = nf_get_afinfo(family);
307 if (afinfo)
308 csum = afinfo->checksum(skb, hook, dataoff, protocol);
309 rcu_read_unlock();
310 return csum;
311}
312
313static inline __sum16
314nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
315 unsigned int dataoff, unsigned int len,
316 u_int8_t protocol, unsigned short family)
317{
318 const struct nf_afinfo *afinfo;
319 __sum16 csum = 0;
320
321 rcu_read_lock();
322 afinfo = nf_get_afinfo(family);
323 if (afinfo)
324 csum = afinfo->checksum_partial(skb, hook, dataoff, len,
325 protocol);
326 rcu_read_unlock();
327 return csum;
328}
329
330int nf_register_afinfo(const struct nf_afinfo *afinfo);
331void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
332
333#include <net/flow.h>
334extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
335
336static inline void
337nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
338{
339#ifdef CONFIG_NF_NAT_NEEDED
340 void (*decodefn)(struct sk_buff *, struct flowi *);
341
342 rcu_read_lock();
343 decodefn = rcu_dereference(nf_nat_decode_session_hook);
344 if (decodefn)
345 decodefn(skb, fl);
346 rcu_read_unlock();
347#endif
348}
349
350#else
351static inline int
352NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
353 struct sk_buff *skb, struct net_device *in, struct net_device *out,
354 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
355 bool cond)
356{
357 return okfn(net, sk, skb);
358}
359
360static inline int
361NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
362 struct sk_buff *skb, struct net_device *in, struct net_device *out,
363 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
364{
365 return okfn(net, sk, skb);
366}
367
368static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
369 struct sock *sk, struct sk_buff *skb,
370 struct net_device *indev, struct net_device *outdev,
371 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
372{
373 return 1;
374}
375struct flowi;
376static inline void
377nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
378{
379}
380#endif
381
382#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
383#include <linux/netfilter/nf_conntrack_zones_common.h>
384
385extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
386void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
387extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;
388#else
389static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
390#endif
391
392struct nf_conn;
393enum ip_conntrack_info;
394struct nlattr;
395
396struct nfnl_ct_hook {
397 struct nf_conn *(*get_ct)(const struct sk_buff *skb,
398 enum ip_conntrack_info *ctinfo);
399 size_t (*build_size)(const struct nf_conn *ct);
400 int (*build)(struct sk_buff *skb, struct nf_conn *ct,
401 enum ip_conntrack_info ctinfo,
402 u_int16_t ct_attr, u_int16_t ct_info_attr);
403 int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
404 int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
405 u32 portid, u32 report);
406 void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
407 enum ip_conntrack_info ctinfo, s32 off);
408};
409extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;
410
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414
415
416
417
418
419
420DECLARE_PER_CPU(bool, nf_skb_duplicated);
421
422#endif
423