1 #ifndef __LINUX_NETFILTER_H
2 #define __LINUX_NETFILTER_H
4 #include <linux/init.h>
5 #include <linux/skbuff.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>
17 #ifdef CONFIG_NETFILTER
18 static inline int NF_DROP_GETERR(int verdict)
20 return -(verdict >> NF_VERDICT_QBITS);
23 static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1,
24 const union nf_inet_addr *a2)
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];
32 static 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)
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];
42 int netfilter_init(void);
50 struct nf_hook_state {
54 struct net_device *in;
55 struct net_device *out;
58 struct list_head *hook_list;
59 int (*okfn)(struct net *, struct sock *, struct sk_buff *);
62 static inline void nf_hook_state_init(struct nf_hook_state *p,
63 struct list_head *hook_list,
65 int thresh, u_int8_t pf,
66 struct net_device *indev,
67 struct net_device *outdev,
70 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
79 p->hook_list = hook_list;
83 typedef unsigned int nf_hookfn(void *priv,
85 const struct nf_hook_state *state);
88 struct list_head list;
90 /* User fills in from here down. */
92 struct net_device *dev;
97 /* Hooks are ordered in ascending priority. */
101 struct nf_sockopt_ops {
102 struct list_head list;
106 /* Non-inclusive ranges: use 0/0/NULL to never get called. */
109 int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
111 int (*compat_set)(struct sock *sk, int optval,
112 void __user *user, unsigned int len);
116 int (*get)(struct sock *sk, int optval, void __user *user, int *len);
118 int (*compat_get)(struct sock *sk, int optval,
119 void __user *user, int *len);
121 /* Use the module struct to lock set/get code in place */
122 struct module *owner;
125 /* Function to register/unregister hook points. */
126 int nf_register_net_hook(struct net *net, const struct nf_hook_ops *ops);
127 void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *ops);
128 int nf_register_net_hooks(struct net *net, const struct nf_hook_ops *reg,
130 void nf_unregister_net_hooks(struct net *net, const struct nf_hook_ops *reg,
133 int nf_register_hook(struct nf_hook_ops *reg);
134 void nf_unregister_hook(struct nf_hook_ops *reg);
135 int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
136 void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
138 /* Functions to register get/setsockopt ranges (non-inclusive). You
139 need to check permissions yourself! */
140 int nf_register_sockopt(struct nf_sockopt_ops *reg);
141 void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
143 #ifdef HAVE_JUMP_LABEL
144 extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
146 static inline bool nf_hook_list_active(struct list_head *hook_list,
147 u_int8_t pf, unsigned int hook)
149 if (__builtin_constant_p(pf) &&
150 __builtin_constant_p(hook))
151 return static_key_false(&nf_hooks_needed[pf][hook]);
153 return !list_empty(hook_list);
156 static inline bool nf_hook_list_active(struct list_head *hook_list,
157 u_int8_t pf, unsigned int hook)
159 return !list_empty(hook_list);
163 int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state);
166 * nf_hook_thresh - call a netfilter hook
168 * Returns 1 if the hook has allowed the packet to pass. The function
169 * okfn must be invoked by the caller in this case. Any other return
170 * value indicates the packet has been consumed by the hook.
172 static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
176 struct net_device *indev,
177 struct net_device *outdev,
178 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
181 struct list_head *hook_list = &net->nf.hooks[pf][hook];
183 if (nf_hook_list_active(hook_list, pf, hook)) {
184 struct nf_hook_state state;
186 nf_hook_state_init(&state, hook_list, hook, thresh,
187 pf, indev, outdev, sk, net, okfn);
188 return nf_hook_slow(skb, &state);
193 static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
194 struct sock *sk, struct sk_buff *skb,
195 struct net_device *indev, struct net_device *outdev,
196 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
198 return nf_hook_thresh(pf, hook, net, sk, skb, indev, outdev, okfn, INT_MIN);
201 /* Activate hook; either okfn or kfree_skb called, unless a hook
202 returns NF_STOLEN (in which case, it's up to the hook to deal with
205 Returns -ERRNO if packet dropped. Zero means queued, stolen or
210 > I don't want nf_hook to return anything because people might forget
211 > about async and trust the return value to mean "packet was ok".
214 Just document it clearly, then you can expect some sense from kernel
219 NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
220 struct sk_buff *skb, struct net_device *in,
221 struct net_device *out,
222 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
225 int ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, thresh);
227 ret = okfn(net, sk, skb);
232 NF_HOOK_COND(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk,
233 struct sk_buff *skb, struct net_device *in, struct net_device *out,
234 int (*okfn)(struct net *, struct sock *, struct sk_buff *),
240 ((ret = nf_hook_thresh(pf, hook, net, sk, skb, in, out, okfn, INT_MIN)) == 1))
241 ret = okfn(net, sk, skb);
246 NF_HOOK(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, struct sk_buff *skb,
247 struct net_device *in, struct net_device *out,
248 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
250 return NF_HOOK_THRESH(pf, hook, net, sk, skb, in, out, okfn, INT_MIN);
253 /* Call setsockopt() */
254 int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
256 int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
259 int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
260 char __user *opt, unsigned int len);
261 int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
262 char __user *opt, int *len);
265 /* Call this before modifying an existing packet: ensures it is
266 modifiable and linear to the point you care about (writable_len).
267 Returns true or false. */
268 int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
271 struct nf_queue_entry;
274 unsigned short family;
275 __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook,
276 unsigned int dataoff, u_int8_t protocol);
277 __sum16 (*checksum_partial)(struct sk_buff *skb,
279 unsigned int dataoff,
282 int (*route)(struct net *net, struct dst_entry **dst,
283 struct flowi *fl, bool strict);
284 void (*saveroute)(const struct sk_buff *skb,
285 struct nf_queue_entry *entry);
286 int (*reroute)(struct net *net, struct sk_buff *skb,
287 const struct nf_queue_entry *entry);
291 extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
292 static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
294 return rcu_dereference(nf_afinfo[family]);
297 static inline __sum16
298 nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
299 u_int8_t protocol, unsigned short family)
301 const struct nf_afinfo *afinfo;
305 afinfo = nf_get_afinfo(family);
307 csum = afinfo->checksum(skb, hook, dataoff, protocol);
312 static inline __sum16
313 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
314 unsigned int dataoff, unsigned int len,
315 u_int8_t protocol, unsigned short family)
317 const struct nf_afinfo *afinfo;
321 afinfo = nf_get_afinfo(family);
323 csum = afinfo->checksum_partial(skb, hook, dataoff, len,
329 int nf_register_afinfo(const struct nf_afinfo *afinfo);
330 void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
332 #include <net/flow.h>
333 extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
336 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
338 #ifdef CONFIG_NF_NAT_NEEDED
339 void (*decodefn)(struct sk_buff *, struct flowi *);
342 decodefn = rcu_dereference(nf_nat_decode_session_hook);
349 #else /* !CONFIG_NETFILTER */
350 #define NF_HOOK(pf, hook, net, sk, skb, indev, outdev, okfn) (okfn)(net, sk, skb)
351 #define NF_HOOK_COND(pf, hook, net, sk, skb, indev, outdev, okfn, cond) (okfn)(net, sk, skb)
352 static inline int nf_hook(u_int8_t pf, unsigned int hook, struct net *net,
353 struct sock *sk, struct sk_buff *skb,
354 struct net_device *indev, struct net_device *outdev,
355 int (*okfn)(struct net *, struct sock *, struct sk_buff *))
361 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
364 #endif /*CONFIG_NETFILTER*/
366 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
367 #include <linux/netfilter/nf_conntrack_zones_common.h>
369 extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
370 void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
371 extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;
374 enum ip_conntrack_info;
378 size_t (*build_size)(const struct nf_conn *ct);
379 int (*build)(struct sk_buff *skb, struct nf_conn *ct);
380 int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
381 int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
382 u32 portid, u32 report);
383 void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
384 enum ip_conntrack_info ctinfo, s32 off);
386 extern struct nfq_ct_hook __rcu *nfq_ct_hook;
388 static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
392 * nf_skb_duplicated - TEE target has sent a packet
394 * When a xtables target sends a packet, the OUTPUT and POSTROUTING
395 * hooks are traversed again, i.e. nft and xtables are invoked recursively.
397 * This is used by xtables TEE target to prevent the duplicated skb from
398 * being duplicated again.
400 DECLARE_PER_CPU(bool, nf_skb_duplicated);
402 #endif /*__LINUX_NETFILTER_H*/