1#ifndef __LINUX_NETFILTER_H
2#define __LINUX_NETFILTER_H
3
4#include <linux/init.h>
5#include <linux/skbuff.h>
6#include <linux/net.h>
7#include <linux/if.h>
8#include <linux/in.h>
9#include <linux/in6.h>
10#include <linux/wait.h>
11#include <linux/list.h>
12#include <linux/static_key.h>
13#include <linux/netfilter_defs.h>
14#include <linux/netdevice.h>
15#include <net/net_namespace.h>
16
17#ifdef CONFIG_NETFILTER
18static inline int NF_DROP_GETERR(int verdict)
19{
20 return -(verdict >> NF_VERDICT_QBITS);
21}
22
23static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
24 const union nf_inet_addr *a2)
25{
26 return a1->all[0] == a2->all[0] &&
27 a1->all[1] == a2->all[1] &&
28 a1->all[2] == a2->all[2] &&
29 a1->all[3] == a2->all[3];
30}
31
32static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
33 union nf_inet_addr *result,
34 const union nf_inet_addr *mask)
35{
36 result->all[0] = a1->all[0] & mask->all[0];
37 result->all[1] = a1->all[1] & mask->all[1];
38 result->all[2] = a1->all[2] & mask->all[2];
39 result->all[3] = a1->all[3] & mask->all[3];
40}
41
42int netfilter_init(void);
43
44struct sk_buff;
45
46struct nf_hook_ops;
47
48struct sock;
49
50struct nf_hook_state {
51 unsigned int hook;
52 u_int8_t pf;
53 struct net_device *in;
54 struct net_device *out;
55 struct sock *sk;
56 struct net *net;
57 int (*okfn)(struct net *, struct sock *, struct sk_buff *);
58};
59
60typedef unsigned int nf_hookfn(void *priv,
61 struct sk_buff *skb,
62 const struct nf_hook_state *state);
63struct nf_hook_ops {
64
65 nf_hookfn *hook;
66 struct net_device *dev;
67 void *priv;
68 u_int8_t pf;
69 unsigned int hooknum;
70
71 int priority;
72};
73
74struct nf_hook_entry {
75 struct nf_hook_entry __rcu *next;
76 nf_hookfn *hook;
77 void *priv;
78 const struct nf_hook_ops *orig_ops;
79};
80
81static inline void
82nf_hook_entry_init(struct nf_hook_entry *entry, const struct nf_hook_ops *ops)
83{
84 entry->next = NULL;
85 entry->hook = ops->hook;
86 entry->priv = ops->priv;
87 entry->orig_ops = ops;
88}
89
90static inline int
91nf_hook_entry_priority(const struct nf_hook_entry *entry)
92{
93 return entry->orig_ops->priority;
94}
95
96static inline int
97nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb,
98 struct nf_hook_state *state)
99{
100 return entry->hook(entry->priv, skb, state);
101}
102
103static inline const struct nf_hook_ops *
104nf_hook_entry_ops(const struct nf_hook_entry *entry)
105{
106 return entry->orig_ops;
107}
108
109static inline void nf_hook_state_init(struct nf_hook_state *p,
110 unsigned int hook,
111 u_int8_t pf,
112 struct net_device *indev,
113 struct net_device *outdev,
114 struct sock *sk,
115 struct net *net,
116 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
117{
118 p->hook = hook;
119 p->pf = pf;
120 p->in = indev;
121 p->out = outdev;
122 p->sk = sk;
123 p->net = net;
124 p->okfn = okfn;
125}
126
127
128
129struct nf_sockopt_ops {
130 struct list_head list;
131
132 u_int8_t pf;
133
134
135 int set_optmin;
136 int set_optmax;
137 int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
138#ifdef CONFIG_COMPAT
139 int (*compat_set)(struct sock *sk, int optval,
140 void __user *user, unsigned int len);
141#endif
142 int get_optmin;
143 int get_optmax;
144 int (*get)(struct sock *sk, int optval, void __user *user, int *len);
145#ifdef CONFIG_COMPAT
146 int (*compat_get)(struct sock *sk, int optval,
147 void __user *user, int *len);
148#endif
149
150 struct module *owner;
151};
152
153
154int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops);
155void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops);
156int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
157 unsigned int n);
158void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
159 unsigned int n);
160
161
162
163int nf_register_sockopt(struct nf_sockopt_ops *reg);
164void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
165
166#ifdef HAVE_JUMP_LABEL
167extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
168#endif
169
170int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
171 struct nf_hook_entry *entry);
172
173
174
175
176
177
178
179
180static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
181 struct sock *sk, struct sk_buff *skb,
182 struct net_device *indev, struct net_device *outdev,
183 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
184{
185 struct nf_hook_entry *hook_head;
186 int ret = 1;
187
188#ifdef HAVE_JUMP_LABEL
189 if (__builtin_constant_p(pf) &&
190 __builtin_constant_p(hook) &&
191 !static_key_false(&nf_hooks_needed[pf][hook]))
192 return 1;
193#endif
194
195 rcu_read_lock();
196 hook_head = rcu_dereference(net->nf.hooks[pf][hook]);
197 if (hook_head) {
198 struct nf_hook_state state;
199
200 nf_hook_state_init(&state, hook, pf, indev, outdev,
201 sk, net, okfn);
202
203 ret = nf_hook_slow(skb, &state, hook_head);
204 }
205 rcu_read_unlock();
206
207 return ret;
208}
209
210
211
212
213
214
215
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218
219
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222
223
224
225
226
227static inline int
228NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
229 struct sk_buff *skb, struct net_device *in, struct net_device *out,
230 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
231 bool cond)
232{
233 int ret;
234
235 if (!cond ||
236 ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1))
237 ret = okfn(net, sk, skb);
238 return ret;
239}
240
241static inline int
242NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb,
243 struct net_device *in, struct net_device *out,
244 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
245{
246 int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
247 if (ret == 1)
248 ret = okfn(net, sk, skb);
249 return ret;
250}
251
252
253int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
254 unsigned int len);
255int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
256 int *len);
257#ifdef CONFIG_COMPAT
258int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
259 char __user *opt, unsigned int len);
260int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
261 char __user *opt, int *len);
262#endif
263
264
265
266
267int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
268
269struct flowi;
270struct nf_queue_entry;
271
272struct nf_afinfo {
273 unsigned short family;
274 __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
275 unsigned int dataoff, u_int8_t protocol);
276 __sum16 (*checksum_partial)(struct sk_buff *skb,
277 unsigned int hook,
278 unsigned int dataoff,
279 unsigned int len,
280 u_int8_t protocol);
281 int (*route)(struct net *net, struct dst_entry **dst,
282 struct flowi *fl, bool strict);
283 void (*saveroute)(const struct sk_buff *skb,
284 struct nf_queue_entry *entry);
285 int (*reroute)(struct net *net, struct sk_buff *skb,
286 const struct nf_queue_entry *entry);
287 int route_key_size;
288};
289
290extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
291static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
292{
293 return rcu_dereference(nf_afinfo[family]);
294}
295
296static inline __sum16
297nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
298 u_int8_t protocol, unsigned short family)
299{
300 const struct nf_afinfo *afinfo;
301 __sum16 csum = 0;
302
303 rcu_read_lock();
304 afinfo = nf_get_afinfo(family);
305 if (afinfo)
306 csum = afinfo->checksum(skb, hook, dataoff, protocol);
307 rcu_read_unlock();
308 return csum;
309}
310
311static inline __sum16
312nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
313 unsigned int dataoff, unsigned int len,
314 u_int8_t protocol, unsigned short family)
315{
316 const struct nf_afinfo *afinfo;
317 __sum16 csum = 0;
318
319 rcu_read_lock();
320 afinfo = nf_get_afinfo(family);
321 if (afinfo)
322 csum = afinfo->checksum_partial(skb, hook, dataoff, len,
323 protocol);
324 rcu_read_unlock();
325 return csum;
326}
327
328int nf_register_afinfo(const struct nf_afinfo *afinfo);
329void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
330
331#include <net/flow.h>
332extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
333
334static inline void
335nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
336{
337#ifdef CONFIG_NF_NAT_NEEDED
338 void (*decodefn)(struct sk_buff *, struct flowi *);
339
340 rcu_read_lock();
341 decodefn = rcu_dereference(nf_nat_decode_session_hook);
342 if (decodefn)
343 decodefn(skb, fl);
344 rcu_read_unlock();
345#endif
346}
347
348#else
349static inline int
350NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
351 struct sk_buff *skb, struct net_device *in, struct net_device *out,
352 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
353 bool cond)
354{
355 return okfn(net, sk, skb);
356}
357
358static inline int
359NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
360 struct sk_buff *skb, struct net_device *in, struct net_device *out,
361 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
362{
363 return okfn(net, sk, skb);
364}
365
366static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
367 struct sock *sk, struct sk_buff *skb,
368 struct net_device *indev, struct net_device *outdev,
369 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
370{
371 return 1;
372}
373struct flowi;
374static inline void
375nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
376{
377}
378#endif
379
380#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
381#include <linux/netfilter/nf_conntrack_zones_common.h>
382
383extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
384void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
385extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;
386#else
387static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
388#endif
389
390struct nf_conn;
391enum ip_conntrack_info;
392struct nlattr;
393
394struct nfnl_ct_hook {
395 struct nf_conn *(*get_ct)(const struct sk_buff *skb,
396 enum ip_conntrack_info *ctinfo);
397 size_t (*build_size)(const struct nf_conn *ct);
398 int (*build)(struct sk_buff *skb, struct nf_conn *ct,
399 enum ip_conntrack_info ctinfo,
400 u_int16_t ct_attr, u_int16_t ct_info_attr);
401 int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
402 int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
403 u32 portid, u32 report);
404 void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
405 enum ip_conntrack_info ctinfo, s32 off);
406};
407extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;
408
409
410
411
412
413
414
415
416
417
418DECLARE_PER_CPU(bool, nf_skb_duplicated);
419
420#endif
421