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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/netfilter.h
1 #ifndef __LINUX_NETFILTER_H
2 #define __LINUX_NETFILTER_H
5 #include <linux/init.h>
6 #include <linux/types.h>
7 #include <linux/skbuff.h>
10 #include <linux/wait.h>
11 #include <linux/list.h>
13 #include <linux/compiler.h>
15 /* Responses from hook functions. */
22 #define NF_MAX_VERDICT NF_STOP
24 /* we overload the higher bits for encoding auxiliary data such as the queue
25 * number. Not nice, but better than additional function arguments. */
26 #define NF_VERDICT_MASK 0x0000ffff
27 #define NF_VERDICT_BITS 16
29 #define NF_VERDICT_QMASK 0xffff0000
30 #define NF_VERDICT_QBITS 16
32 #define NF_QUEUE_NR(x) (((x << NF_VERDICT_QBITS) & NF_VERDICT_QMASK) | NF_QUEUE)
34 /* only for userspace compatibility */
36 /* Generic cache responses from hook functions.
37 <= 0x2000 is used for protocol-flags. */
38 #define NFC_UNKNOWN 0x4000
39 #define NFC_ALTERED 0x8000
43 #include <linux/config.h>
44 #ifdef CONFIG_NETFILTER
46 extern void netfilter_init(void);
48 /* Largest hook number + 1 */
49 #define NF_MAX_HOOKS 8
54 typedef unsigned int nf_hookfn(unsigned int hooknum
,
56 const struct net_device
*in
,
57 const struct net_device
*out
,
58 int (*okfn
)(struct sk_buff
*));
62 struct list_head list
;
64 /* User fills in from here down. */
69 /* Hooks are ordered in ascending priority. */
75 struct list_head list
;
79 /* Non-inclusive ranges: use 0/0/NULL to never get called. */
82 int (*set
)(struct sock
*sk
, int optval
, void __user
*user
, unsigned int len
);
86 int (*get
)(struct sock
*sk
, int optval
, void __user
*user
, int *len
);
88 /* Number of users inside set() or get(). */
90 struct task_struct
*cleanup_task
;
93 /* Each queued (to userspace) skbuff has one of these. */
96 /* The ops struct which sent us to userspace. */
97 struct nf_hook_ops
*elem
;
99 /* If we're sent to userspace, this keeps housekeeping info */
102 struct net_device
*indev
, *outdev
;
103 int (*okfn
)(struct sk_buff
*);
106 /* Function to register/unregister hook points. */
107 int nf_register_hook(struct nf_hook_ops
*reg
);
108 void nf_unregister_hook(struct nf_hook_ops
*reg
);
110 /* Functions to register get/setsockopt ranges (non-inclusive). You
111 need to check permissions yourself! */
112 int nf_register_sockopt(struct nf_sockopt_ops
*reg
);
113 void nf_unregister_sockopt(struct nf_sockopt_ops
*reg
);
115 extern struct list_head nf_hooks
[NPROTO
][NF_MAX_HOOKS
];
117 /* those NF_LOG_* defines and struct nf_loginfo are legacy definitios that will
118 * disappear once iptables is replaced with pkttables. Please DO NOT use them
119 * for any new code! */
120 #define NF_LOG_TCPSEQ 0x01 /* Log TCP sequence numbers */
121 #define NF_LOG_TCPOPT 0x02 /* Log TCP options */
122 #define NF_LOG_IPOPT 0x04 /* Log IP options */
123 #define NF_LOG_UID 0x08 /* Log UID owning local socket */
124 #define NF_LOG_MASK 0x0f
126 #define NF_LOG_TYPE_LOG 0x01
127 #define NF_LOG_TYPE_ULOG 0x02
135 u_int16_t qthreshold
;
144 typedef void nf_logfn(unsigned int pf
,
145 unsigned int hooknum
,
146 const struct sk_buff
*skb
,
147 const struct net_device
*in
,
148 const struct net_device
*out
,
149 const struct nf_loginfo
*li
,
158 /* Function to register/unregister log function. */
159 int nf_log_register(int pf
, struct nf_logger
*logger
);
160 int nf_log_unregister_pf(int pf
);
161 void nf_log_unregister_logger(struct nf_logger
*logger
);
163 /* Calls the registered backend logging function */
164 void nf_log_packet(int pf
,
165 unsigned int hooknum
,
166 const struct sk_buff
*skb
,
167 const struct net_device
*in
,
168 const struct net_device
*out
,
169 struct nf_loginfo
*li
,
170 const char *fmt
, ...);
172 /* Activate hook; either okfn or kfree_skb called, unless a hook
173 returns NF_STOLEN (in which case, it's up to the hook to deal with
176 Returns -ERRNO if packet dropped. Zero means queued, stolen or
181 > I don't want nf_hook to return anything because people might forget
182 > about async and trust the return value to mean "packet was ok".
185 Just document it clearly, then you can expect some sense from kernel
189 /* This is gross, but inline doesn't cut it for avoiding the function
190 call in fast path: gcc doesn't inline (needs value tracking?). --RR */
191 #ifdef CONFIG_NETFILTER_DEBUG
192 #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
194 if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \
195 __ret = (okfn)(skb); \
197 #define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
199 if ((__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1) \
200 __ret = (okfn)(skb); \
203 #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) \
205 if (list_empty(&nf_hooks[pf][hook]) || \
206 (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, INT_MIN)) == 1) \
207 __ret = (okfn)(skb); \
209 #define NF_HOOK_THRESH(pf, hook, skb, indev, outdev, okfn, thresh) \
211 if (list_empty(&nf_hooks[pf][hook]) || \
212 (__ret=nf_hook_slow(pf, hook, &(skb), indev, outdev, okfn, thresh)) == 1) \
213 __ret = (okfn)(skb); \
217 int nf_hook_slow(int pf
, unsigned int hook
, struct sk_buff
**pskb
,
218 struct net_device
*indev
, struct net_device
*outdev
,
219 int (*okfn
)(struct sk_buff
*), int thresh
);
221 /* Call setsockopt() */
222 int nf_setsockopt(struct sock
*sk
, int pf
, int optval
, char __user
*opt
,
224 int nf_getsockopt(struct sock
*sk
, int pf
, int optval
, char __user
*opt
,
228 struct nf_queue_handler
{
229 int (*outfn
)(struct sk_buff
*skb
, struct nf_info
*info
,
230 unsigned int queuenum
, void *data
);
234 extern int nf_register_queue_handler(int pf
,
235 struct nf_queue_handler
*qh
);
236 extern int nf_unregister_queue_handler(int pf
);
237 extern void nf_unregister_queue_handlers(struct nf_queue_handler
*qh
);
238 extern void nf_reinject(struct sk_buff
*skb
,
239 struct nf_info
*info
,
240 unsigned int verdict
);
242 extern void (*ip_ct_attach
)(struct sk_buff
*, struct sk_buff
*);
243 extern void nf_ct_attach(struct sk_buff
*, struct sk_buff
*);
245 /* FIXME: Before cache is ever used, this must be implemented for real. */
246 extern void nf_invalidate_cache(int pf
);
248 /* Call this before modifying an existing packet: ensures it is
249 modifiable and linear to the point you care about (writable_len).
250 Returns true or false. */
251 extern int skb_make_writable(struct sk_buff
**pskb
, unsigned int writable_len
);
253 struct nf_queue_rerouter
{
254 void (*save
)(const struct sk_buff
*skb
, struct nf_info
*info
);
255 int (*reroute
)(struct sk_buff
**skb
, const struct nf_info
*info
);
259 #define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info))
261 extern int nf_register_queue_rerouter(int pf
, struct nf_queue_rerouter
*rer
);
262 extern int nf_unregister_queue_rerouter(int pf
);
264 #ifdef CONFIG_PROC_FS
265 #include <linux/proc_fs.h>
266 extern struct proc_dir_entry
*proc_net_netfilter
;
269 #else /* !CONFIG_NETFILTER */
270 #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb)
271 static inline void nf_ct_attach(struct sk_buff
*new, struct sk_buff
*skb
) {}
272 #endif /*CONFIG_NETFILTER*/
274 #endif /*__KERNEL__*/
275 #endif /*__LINUX_NETFILTER_H*/