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 <linux/sockptr.h>
17#include <net/net_namespace.h>
18
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
28 const unsigned long *ul1 = (const unsigned long *)a1;
29 const unsigned long *ul2 = (const unsigned long *)a2;
30
31 return ((ul1[0] ^ ul2[0]) | (ul1[1] ^ ul2[1])) == 0UL;
32#else
33 return a1->all[0] == a2->all[0] &&
34 a1->all[1] == a2->all[1] &&
35 a1->all[2] == a2->all[2] &&
36 a1->all[3] == a2->all[3];
37#endif
38}
39
40static inline void nf_inet_addr_mask(const union nf_inet_addr *a1,
41 union nf_inet_addr *result,
42 const union nf_inet_addr *mask)
43{
44#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64
45 const unsigned long *ua = (const unsigned long *)a1;
46 unsigned long *ur = (unsigned long *)result;
47 const unsigned long *um = (const unsigned long *)mask;
48
49 ur[0] = ua[0] & um[0];
50 ur[1] = ua[1] & um[1];
51#else
52 result->all[0] = a1->all[0] & mask->all[0];
53 result->all[1] = a1->all[1] & mask->all[1];
54 result->all[2] = a1->all[2] & mask->all[2];
55 result->all[3] = a1->all[3] & mask->all[3];
56#endif
57}
58
59int netfilter_init(void);
60
61struct sk_buff;
62
63struct nf_hook_ops;
64
65struct sock;
66
67struct nf_hook_state {
68 u8 hook;
69 u8 pf;
70 struct net_device *in;
71 struct net_device *out;
72 struct sock *sk;
73 struct net *net;
74 int (*okfn)(struct net *, struct sock *, struct sk_buff *);
75};
76
77typedef unsigned int nf_hookfn(void *priv,
78 struct sk_buff *skb,
79 const struct nf_hook_state *state);
80enum nf_hook_ops_type {
81 NF_HOOK_OP_UNDEFINED,
82 NF_HOOK_OP_NF_TABLES,
83};
84
85struct nf_hook_ops {
86
87 nf_hookfn *hook;
88 struct net_device *dev;
89 void *priv;
90 u8 pf;
91 enum nf_hook_ops_type hook_ops_type:8;
92 unsigned int hooknum;
93
94 int priority;
95};
96
97struct nf_hook_entry {
98 nf_hookfn *hook;
99 void *priv;
100};
101
102struct nf_hook_entries_rcu_head {
103 struct rcu_head head;
104 void *allocation;
105};
106
107struct nf_hook_entries {
108 u16 num_hook_entries;
109
110 struct nf_hook_entry hooks[];
111
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123
124
125};
126
127#ifdef CONFIG_NETFILTER
128static inline struct nf_hook_ops **nf_hook_entries_get_hook_ops(const struct nf_hook_entries *e)
129{
130 unsigned int n = e->num_hook_entries;
131 const void *hook_end;
132
133 hook_end = &e->hooks[n];
134
135 return (struct nf_hook_ops **)hook_end;
136}
137
138static inline int
139nf_hook_entry_hookfn(const struct nf_hook_entry *entry, struct sk_buff *skb,
140 struct nf_hook_state *state)
141{
142 return entry->hook(entry->priv, skb, state);
143}
144
145static inline void nf_hook_state_init(struct nf_hook_state *p,
146 unsigned int hook,
147 u_int8_t pf,
148 struct net_device *indev,
149 struct net_device *outdev,
150 struct sock *sk,
151 struct net *net,
152 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
153{
154 p->hook = hook;
155 p->pf = pf;
156 p->in = indev;
157 p->out = outdev;
158 p->sk = sk;
159 p->net = net;
160 p->okfn = okfn;
161}
162
163
164
165struct nf_sockopt_ops {
166 struct list_head list;
167
168 u_int8_t pf;
169
170
171 int set_optmin;
172 int set_optmax;
173 int (*set)(struct sock *sk, int optval, sockptr_t arg,
174 unsigned int len);
175 int get_optmin;
176 int get_optmax;
177 int (*get)(struct sock *sk, int optval, void __user *user, int *len);
178
179 struct module *owner;
180};
181
182
183int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops);
184void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops);
185int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
186 unsigned int n);
187void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
188 unsigned int n);
189
190
191
192int nf_register_sockopt(struct nf_sockopt_ops *reg);
193void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
194
195#ifdef CONFIG_JUMP_LABEL
196extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
197#endif
198
199int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state,
200 const struct nf_hook_entries *e, unsigned int i);
201
202void nf_hook_slow_list(struct list_head *head, struct nf_hook_state *state,
203 const struct nf_hook_entries *e);
204
205
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209
210
211static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
212 struct sock *sk, struct sk_buff *skb,
213 struct net_device *indev, struct net_device *outdev,
214 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
215{
216 struct nf_hook_entries *hook_head = NULL;
217 int ret = 1;
218
219#ifdef CONFIG_JUMP_LABEL
220 if (__builtin_constant_p(pf) &&
221 __builtin_constant_p(hook) &&
222 !static_key_false(&nf_hooks_needed[pf][hook]))
223 return 1;
224#endif
225
226 rcu_read_lock();
227 switch (pf) {
228 case NFPROTO_IPV4:
229 hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
230 break;
231 case NFPROTO_IPV6:
232 hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
233 break;
234 case NFPROTO_ARP:
235#ifdef CONFIG_NETFILTER_FAMILY_ARP
236 if (WARN_ON_ONCE(hook >= ARRAY_SIZE(net->nf.hooks_arp)))
237 break;
238 hook_head = rcu_dereference(net->nf.hooks_arp[hook]);
239#endif
240 break;
241 case NFPROTO_BRIDGE:
242#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
243 hook_head = rcu_dereference(net->nf.hooks_bridge[hook]);
244#endif
245 break;
246#if IS_ENABLED(CONFIG_DECNET)
247 case NFPROTO_DECNET:
248 hook_head = rcu_dereference(net->nf.hooks_decnet[hook]);
249 break;
250#endif
251 default:
252 WARN_ON_ONCE(1);
253 break;
254 }
255
256 if (hook_head) {
257 struct nf_hook_state state;
258
259 nf_hook_state_init(&state, hook, pf, indev, outdev,
260 sk, net, okfn);
261
262 ret = nf_hook_slow(skb, &state, hook_head, 0);
263 }
264 rcu_read_unlock();
265
266 return ret;
267}
268
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284
285
286static inline int
287NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
288 struct sk_buff *skb, struct net_device *in, struct net_device *out,
289 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
290 bool cond)
291{
292 int ret;
293
294 if (!cond ||
295 ((ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn)) == 1))
296 ret = okfn(net, sk, skb);
297 return ret;
298}
299
300static inline int
301NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb,
302 struct net_device *in, struct net_device *out,
303 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
304{
305 int ret = nf_hook(pf, hook, net, sk, skb, in, out, okfn);
306 if (ret == 1)
307 ret = okfn(net, sk, skb);
308 return ret;
309}
310
311static inline void
312NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
313 struct list_head *head, struct net_device *in, struct net_device *out,
314 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
315{
316 struct nf_hook_entries *hook_head = NULL;
317
318#ifdef CONFIG_JUMP_LABEL
319 if (__builtin_constant_p(pf) &&
320 __builtin_constant_p(hook) &&
321 !static_key_false(&nf_hooks_needed[pf][hook]))
322 return;
323#endif
324
325 rcu_read_lock();
326 switch (pf) {
327 case NFPROTO_IPV4:
328 hook_head = rcu_dereference(net->nf.hooks_ipv4[hook]);
329 break;
330 case NFPROTO_IPV6:
331 hook_head = rcu_dereference(net->nf.hooks_ipv6[hook]);
332 break;
333 default:
334 WARN_ON_ONCE(1);
335 break;
336 }
337
338 if (hook_head) {
339 struct nf_hook_state state;
340
341 nf_hook_state_init(&state, hook, pf, in, out, sk, net, okfn);
342
343 nf_hook_slow_list(head, &state, hook_head);
344 }
345 rcu_read_unlock();
346}
347
348
349int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, sockptr_t opt,
350 unsigned int len);
351int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
352 int *len);
353
354struct flowi;
355struct nf_queue_entry;
356
357__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
358 unsigned int dataoff, u_int8_t protocol,
359 unsigned short family);
360
361__sum16 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
362 unsigned int dataoff, unsigned int len,
363 u_int8_t protocol, unsigned short family);
364int nf_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
365 bool strict, unsigned short family);
366int nf_reroute(struct sk_buff *skb, struct nf_queue_entry *entry);
367
368#include <net/flow.h>
369
370struct nf_conn;
371enum nf_nat_manip_type;
372struct nlattr;
373enum ip_conntrack_dir;
374
375struct nf_nat_hook {
376 int (*parse_nat_setup)(struct nf_conn *ct, enum nf_nat_manip_type manip,
377 const struct nlattr *attr);
378 void (*decode_session)(struct sk_buff *skb, struct flowi *fl);
379 unsigned int (*manip_pkt)(struct sk_buff *skb, struct nf_conn *ct,
380 enum nf_nat_manip_type mtype,
381 enum ip_conntrack_dir dir);
382};
383
384extern struct nf_nat_hook __rcu *nf_nat_hook;
385
386static inline void
387nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
388{
389#if IS_ENABLED(CONFIG_NF_NAT)
390 struct nf_nat_hook *nat_hook;
391
392 rcu_read_lock();
393 nat_hook = rcu_dereference(nf_nat_hook);
394 if (nat_hook && nat_hook->decode_session)
395 nat_hook->decode_session(skb, fl);
396 rcu_read_unlock();
397#endif
398}
399
400#else
401static inline int
402NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
403 struct sk_buff *skb, struct net_device *in, struct net_device *out,
404 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
405 bool cond)
406{
407 return okfn(net, sk, skb);
408}
409
410static inline int
411NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
412 struct sk_buff *skb, struct net_device *in, struct net_device *out,
413 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
414{
415 return okfn(net, sk, skb);
416}
417
418static inline void
419NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
420 struct list_head *head, struct net_device *in, struct net_device *out,
421 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
422{
423
424}
425
426static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
427 struct sock *sk, struct sk_buff *skb,
428 struct net_device *indev, struct net_device *outdev,
429 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
430{
431 return 1;
432}
433struct flowi;
434static inline void
435nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
436{
437}
438#endif
439
440#if IS_ENABLED(CONFIG_NF_CONNTRACK)
441#include <linux/netfilter/nf_conntrack_zones_common.h>
442
443extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
444void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
445struct nf_conntrack_tuple;
446bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
447 const struct sk_buff *skb);
448#else
449static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
450struct nf_conntrack_tuple;
451static inline bool nf_ct_get_tuple_skb(struct nf_conntrack_tuple *dst_tuple,
452 const struct sk_buff *skb)
453{
454 return false;
455}
456#endif
457
458struct nf_conn;
459enum ip_conntrack_info;
460
461struct nf_ct_hook {
462 int (*update)(struct net *net, struct sk_buff *skb);
463 void (*destroy)(struct nf_conntrack *);
464 bool (*get_tuple_skb)(struct nf_conntrack_tuple *,
465 const struct sk_buff *);
466};
467extern struct nf_ct_hook __rcu *nf_ct_hook;
468
469struct nlattr;
470
471struct nfnl_ct_hook {
472 size_t (*build_size)(const struct nf_conn *ct);
473 int (*build)(struct sk_buff *skb, struct nf_conn *ct,
474 enum ip_conntrack_info ctinfo,
475 u_int16_t ct_attr, u_int16_t ct_info_attr);
476 int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
477 int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
478 u32 portid, u32 report);
479 void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
480 enum ip_conntrack_info ctinfo, s32 off);
481};
482extern struct nfnl_ct_hook __rcu *nfnl_ct_hook;
483
484
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487
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489
490
491
492
493DECLARE_PER_CPU(bool, nf_skb_duplicated);
494
495#endif
496