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TOMOYO Linux Cross Reference
Linux/include/linux/netfilter.h

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  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 <uapi/linux/netfilter.h>
 14 #ifdef CONFIG_NETFILTER
 15 static inline int NF_DROP_GETERR(int verdict)
 16 {
 17         return -(verdict >> NF_VERDICT_QBITS);
 18 }
 19 
 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 
 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 
 39 int netfilter_init(void);
 40 
 41 /* Largest hook number + 1 */
 42 #define NF_MAX_HOOKS 8
 43 
 44 struct sk_buff;
 45 
 46 struct nf_hook_ops;
 47 typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops,
 48                                struct sk_buff *skb,
 49                                const struct net_device *in,
 50                                const struct net_device *out,
 51                                int (*okfn)(struct sk_buff *));
 52 
 53 struct nf_hook_ops {
 54         struct list_head list;
 55 
 56         /* User fills in from here down. */
 57         nf_hookfn       *hook;
 58         struct module   *owner;
 59         void            *priv;
 60         u_int8_t        pf;
 61         unsigned int    hooknum;
 62         /* Hooks are ordered in ascending priority. */
 63         int             priority;
 64 };
 65 
 66 struct nf_sockopt_ops {
 67         struct list_head list;
 68 
 69         u_int8_t pf;
 70 
 71         /* Non-inclusive ranges: use 0/0/NULL to never get called. */
 72         int set_optmin;
 73         int set_optmax;
 74         int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len);
 75 #ifdef CONFIG_COMPAT
 76         int (*compat_set)(struct sock *sk, int optval,
 77                         void __user *user, unsigned int len);
 78 #endif
 79         int get_optmin;
 80         int get_optmax;
 81         int (*get)(struct sock *sk, int optval, void __user *user, int *len);
 82 #ifdef CONFIG_COMPAT
 83         int (*compat_get)(struct sock *sk, int optval,
 84                         void __user *user, int *len);
 85 #endif
 86         /* Use the module struct to lock set/get code in place */
 87         struct module *owner;
 88 };
 89 
 90 /* Function to register/unregister hook points. */
 91 int nf_register_hook(struct nf_hook_ops *reg);
 92 void nf_unregister_hook(struct nf_hook_ops *reg);
 93 int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n);
 94 void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n);
 95 
 96 /* Functions to register get/setsockopt ranges (non-inclusive).  You
 97    need to check permissions yourself! */
 98 int nf_register_sockopt(struct nf_sockopt_ops *reg);
 99 void nf_unregister_sockopt(struct nf_sockopt_ops *reg);
100 
101 extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
102 
103 #ifdef HAVE_JUMP_LABEL
104 extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS];
105 
106 static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
107 {
108         if (__builtin_constant_p(pf) &&
109             __builtin_constant_p(hook))
110                 return static_key_false(&nf_hooks_needed[pf][hook]);
111 
112         return !list_empty(&nf_hooks[pf][hook]);
113 }
114 #else
115 static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook)
116 {
117         return !list_empty(&nf_hooks[pf][hook]);
118 }
119 #endif
120 
121 int nf_hook_slow(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
122                  struct net_device *indev, struct net_device *outdev,
123                  int (*okfn)(struct sk_buff *), int thresh);
124 
125 /**
126  *      nf_hook_thresh - call a netfilter hook
127  *      
128  *      Returns 1 if the hook has allowed the packet to pass.  The function
129  *      okfn must be invoked by the caller in this case.  Any other return
130  *      value indicates the packet has been consumed by the hook.
131  */
132 static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
133                                  struct sk_buff *skb,
134                                  struct net_device *indev,
135                                  struct net_device *outdev,
136                                  int (*okfn)(struct sk_buff *), int thresh)
137 {
138         if (nf_hooks_active(pf, hook))
139                 return nf_hook_slow(pf, hook, skb, indev, outdev, okfn, thresh);
140         return 1;
141 }
142 
143 static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
144                           struct net_device *indev, struct net_device *outdev,
145                           int (*okfn)(struct sk_buff *))
146 {
147         return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN);
148 }
149                    
150 /* Activate hook; either okfn or kfree_skb called, unless a hook
151    returns NF_STOLEN (in which case, it's up to the hook to deal with
152    the consequences).
153 
154    Returns -ERRNO if packet dropped.  Zero means queued, stolen or
155    accepted.
156 */
157 
158 /* RR:
159    > I don't want nf_hook to return anything because people might forget
160    > about async and trust the return value to mean "packet was ok".
161 
162    AK:
163    Just document it clearly, then you can expect some sense from kernel
164    coders :)
165 */
166 
167 static inline int
168 NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb,
169                struct net_device *in, struct net_device *out,
170                int (*okfn)(struct sk_buff *), int thresh)
171 {
172         int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh);
173         if (ret == 1)
174                 ret = okfn(skb);
175         return ret;
176 }
177 
178 static inline int
179 NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb,
180              struct net_device *in, struct net_device *out,
181              int (*okfn)(struct sk_buff *), bool cond)
182 {
183         int ret;
184 
185         if (!cond ||
186             ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1))
187                 ret = okfn(skb);
188         return ret;
189 }
190 
191 static inline int
192 NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb,
193         struct net_device *in, struct net_device *out,
194         int (*okfn)(struct sk_buff *))
195 {
196         return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN);
197 }
198 
199 /* Call setsockopt() */
200 int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
201                   unsigned int len);
202 int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt,
203                   int *len);
204 #ifdef CONFIG_COMPAT
205 int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval,
206                 char __user *opt, unsigned int len);
207 int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval,
208                 char __user *opt, int *len);
209 #endif
210 
211 /* Call this before modifying an existing packet: ensures it is
212    modifiable and linear to the point you care about (writable_len).
213    Returns true or false. */
214 int skb_make_writable(struct sk_buff *skb, unsigned int writable_len);
215 
216 struct flowi;
217 struct nf_queue_entry;
218 
219 struct nf_afinfo {
220         unsigned short  family;
221         __sum16         (*checksum)(struct sk_buff *skb, unsigned int hook,
222                                     unsigned int dataoff, u_int8_t protocol);
223         __sum16         (*checksum_partial)(struct sk_buff *skb,
224                                             unsigned int hook,
225                                             unsigned int dataoff,
226                                             unsigned int len,
227                                             u_int8_t protocol);
228         int             (*route)(struct net *net, struct dst_entry **dst,
229                                  struct flowi *fl, bool strict);
230         void            (*saveroute)(const struct sk_buff *skb,
231                                      struct nf_queue_entry *entry);
232         int             (*reroute)(struct sk_buff *skb,
233                                    const struct nf_queue_entry *entry);
234         int             route_key_size;
235 };
236 
237 extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO];
238 static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family)
239 {
240         return rcu_dereference(nf_afinfo[family]);
241 }
242 
243 static inline __sum16
244 nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff,
245             u_int8_t protocol, unsigned short family)
246 {
247         const struct nf_afinfo *afinfo;
248         __sum16 csum = 0;
249 
250         rcu_read_lock();
251         afinfo = nf_get_afinfo(family);
252         if (afinfo)
253                 csum = afinfo->checksum(skb, hook, dataoff, protocol);
254         rcu_read_unlock();
255         return csum;
256 }
257 
258 static inline __sum16
259 nf_checksum_partial(struct sk_buff *skb, unsigned int hook,
260                     unsigned int dataoff, unsigned int len,
261                     u_int8_t protocol, unsigned short family)
262 {
263         const struct nf_afinfo *afinfo;
264         __sum16 csum = 0;
265 
266         rcu_read_lock();
267         afinfo = nf_get_afinfo(family);
268         if (afinfo)
269                 csum = afinfo->checksum_partial(skb, hook, dataoff, len,
270                                                 protocol);
271         rcu_read_unlock();
272         return csum;
273 }
274 
275 int nf_register_afinfo(const struct nf_afinfo *afinfo);
276 void nf_unregister_afinfo(const struct nf_afinfo *afinfo);
277 
278 #include <net/flow.h>
279 extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *);
280 
281 static inline void
282 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
283 {
284 #ifdef CONFIG_NF_NAT_NEEDED
285         void (*decodefn)(struct sk_buff *, struct flowi *);
286 
287         rcu_read_lock();
288         decodefn = rcu_dereference(nf_nat_decode_session_hook);
289         if (decodefn)
290                 decodefn(skb, fl);
291         rcu_read_unlock();
292 #endif
293 }
294 
295 #else /* !CONFIG_NETFILTER */
296 #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
297 #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb)
298 static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook,
299                                  struct sk_buff *skb,
300                                  struct net_device *indev,
301                                  struct net_device *outdev,
302                                  int (*okfn)(struct sk_buff *), int thresh)
303 {
304         return okfn(skb);
305 }
306 static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb,
307                           struct net_device *indev, struct net_device *outdev,
308                           int (*okfn)(struct sk_buff *))
309 {
310         return 1;
311 }
312 struct flowi;
313 static inline void
314 nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family)
315 {
316 }
317 #endif /*CONFIG_NETFILTER*/
318 
319 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
320 extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu;
321 void nf_ct_attach(struct sk_buff *, const struct sk_buff *);
322 extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu;
323 
324 struct nf_conn;
325 enum ip_conntrack_info;
326 struct nlattr;
327 
328 struct nfq_ct_hook {
329         size_t (*build_size)(const struct nf_conn *ct);
330         int (*build)(struct sk_buff *skb, struct nf_conn *ct);
331         int (*parse)(const struct nlattr *attr, struct nf_conn *ct);
332         int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct,
333                              u32 portid, u32 report);
334         void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct,
335                            enum ip_conntrack_info ctinfo, s32 off);
336 };
337 extern struct nfq_ct_hook __rcu *nfq_ct_hook;
338 #else
339 static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {}
340 #endif
341 
342 #endif /*__LINUX_NETFILTER_H*/
343 

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