1 #ifndef _IP_CONNTRACK_H
2 #define _IP_CONNTRACK_H
4 #include <linux/netfilter/nf_conntrack_common.h>
7 #include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
8 #include <linux/bitops.h>
9 #include <linux/compiler.h>
10 #include <asm/atomic.h>
12 #include <linux/netfilter_ipv4/ip_conntrack_tcp.h>
13 #include <linux/netfilter_ipv4/ip_conntrack_icmp.h>
14 #include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
15 #include <linux/netfilter_ipv4/ip_conntrack_sctp.h>
17 /* per conntrack: protocol private data */
18 union ip_conntrack_proto
{
19 /* insert conntrack proto private data here */
21 struct ip_ct_sctp sctp
;
23 struct ip_ct_icmp icmp
;
26 union ip_conntrack_expect_proto
{
27 /* insert expect proto private data here */
30 /* Add protocol helper include file here */
31 #include <linux/netfilter_ipv4/ip_conntrack_h323.h>
32 #include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
33 #include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
34 #include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
35 #include <linux/netfilter_ipv4/ip_conntrack_irc.h>
37 /* per conntrack: application helper private data */
38 union ip_conntrack_help
{
39 /* insert conntrack helper private data (master) here */
40 struct ip_ct_h323_master ct_h323_info
;
41 struct ip_ct_pptp_master ct_pptp_info
;
42 struct ip_ct_ftp_master ct_ftp_info
;
43 struct ip_ct_irc_master ct_irc_info
;
46 #ifdef CONFIG_IP_NF_NAT_NEEDED
47 #include <linux/netfilter_ipv4/ip_nat.h>
48 #include <linux/netfilter_ipv4/ip_nat_pptp.h>
50 /* per conntrack: nat application helper private data */
51 union ip_conntrack_nat_help
{
52 /* insert nat helper private data here */
53 struct ip_nat_pptp nat_pptp_info
;
57 #include <linux/types.h>
58 #include <linux/skbuff.h>
60 #ifdef CONFIG_NETFILTER_DEBUG
61 #define IP_NF_ASSERT(x) \
64 /* Wooah! I'm tripping my conntrack in a frenzy of \
66 printk("NF_IP_ASSERT: %s:%i(%s)\n", \
67 __FILE__, __LINE__, __FUNCTION__); \
70 #define IP_NF_ASSERT(x)
73 struct ip_conntrack_helper
;
77 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
78 plus 1 for any connection(s) we are `master' for */
79 struct nf_conntrack ct_general
;
81 /* Have we seen traffic both ways yet? (bitset) */
84 /* Timer function; drops refcnt when it goes off. */
85 struct timer_list timeout
;
87 #ifdef CONFIG_IP_NF_CT_ACCT
88 /* Accounting Information (same cache line as other written members) */
89 struct ip_conntrack_counter counters
[IP_CT_DIR_MAX
];
91 /* If we were expected by an expectation, this will be it */
92 struct ip_conntrack
*master
;
94 /* Current number of expected connections */
95 unsigned int expecting
;
97 /* Unique ID that identifies this conntrack*/
100 /* Helper, if any. */
101 struct ip_conntrack_helper
*helper
;
103 /* Storage reserved for other modules: */
104 union ip_conntrack_proto proto
;
106 union ip_conntrack_help help
;
108 #ifdef CONFIG_IP_NF_NAT_NEEDED
110 struct ip_nat_info info
;
111 union ip_conntrack_nat_help help
;
112 #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
113 defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
117 #endif /* CONFIG_IP_NF_NAT_NEEDED */
119 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
123 #ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
127 /* Traversed often, so hopefully in different cacheline to top */
128 /* These are my tuples; original and reply */
129 struct ip_conntrack_tuple_hash tuplehash
[IP_CT_DIR_MAX
];
131 #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE)
133 char * app_proto
; /* e.g. "http". NULL before decision. "unknown" after decision if no match */
134 char * app_data
; /* application layer data so far. NULL after match decision */
135 unsigned int app_data_len
;
141 struct ip_conntrack_expect
143 /* Internal linked list (global expectation list) */
144 struct list_head list
;
146 /* We expect this tuple, with the following mask */
147 struct ip_conntrack_tuple tuple
, mask
;
149 /* Function to call after setup and insertion */
150 void (*expectfn
)(struct ip_conntrack
*new,
151 struct ip_conntrack_expect
*this);
153 /* The conntrack of the master connection */
154 struct ip_conntrack
*master
;
156 /* Timer function; deletes the expectation. */
157 struct timer_list timeout
;
168 #ifdef CONFIG_IP_NF_NAT_NEEDED
170 /* This is the original per-proto part, used to map the
171 * expected connection the way the recipient expects. */
172 union ip_conntrack_manip_proto saved_proto
;
173 /* Direction relative to the master connection. */
174 enum ip_conntrack_dir dir
;
178 #define IP_CT_EXPECT_PERMANENT 0x1
180 static inline struct ip_conntrack
*
181 tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash
*hash
)
183 return container_of(hash
, struct ip_conntrack
,
184 tuplehash
[hash
->tuple
.dst
.dir
]);
187 /* get master conntrack via master expectation */
188 #define master_ct(conntr) (conntr->master)
190 /* Alter reply tuple (maybe alter helper). */
192 ip_conntrack_alter_reply(struct ip_conntrack
*conntrack
,
193 const struct ip_conntrack_tuple
*newreply
);
195 /* Is this tuple taken? (ignoring any belonging to the given
198 ip_conntrack_tuple_taken(const struct ip_conntrack_tuple
*tuple
,
199 const struct ip_conntrack
*ignored_conntrack
);
201 /* Return conntrack_info and tuple hash for given skb. */
202 static inline struct ip_conntrack
*
203 ip_conntrack_get(const struct sk_buff
*skb
, enum ip_conntrack_info
*ctinfo
)
205 *ctinfo
= skb
->nfctinfo
;
206 return (struct ip_conntrack
*)skb
->nfct
;
209 /* decrement reference count on a conntrack */
211 ip_conntrack_put(struct ip_conntrack
*ct
)
214 nf_conntrack_put(&ct
->ct_general
);
217 extern int invert_tuplepr(struct ip_conntrack_tuple
*inverse
,
218 const struct ip_conntrack_tuple
*orig
);
220 extern void __ip_ct_refresh_acct(struct ip_conntrack
*ct
,
221 enum ip_conntrack_info ctinfo
,
222 const struct sk_buff
*skb
,
223 unsigned long extra_jiffies
,
226 /* Refresh conntrack for this many jiffies and do accounting */
227 static inline void ip_ct_refresh_acct(struct ip_conntrack
*ct
,
228 enum ip_conntrack_info ctinfo
,
229 const struct sk_buff
*skb
,
230 unsigned long extra_jiffies
)
232 __ip_ct_refresh_acct(ct
, ctinfo
, skb
, extra_jiffies
, 1);
235 /* Refresh conntrack for this many jiffies */
236 static inline void ip_ct_refresh(struct ip_conntrack
*ct
,
237 const struct sk_buff
*skb
,
238 unsigned long extra_jiffies
)
240 __ip_ct_refresh_acct(ct
, 0, skb
, extra_jiffies
, 0);
243 /* These are for NAT. Icky. */
244 /* Update TCP window tracking data when NAT mangles the packet */
245 extern void ip_conntrack_tcp_update(struct sk_buff
*skb
,
246 struct ip_conntrack
*conntrack
,
247 enum ip_conntrack_dir dir
);
249 /* Call me when a conntrack is destroyed. */
250 extern void (*ip_conntrack_destroyed
)(struct ip_conntrack
*conntrack
);
252 /* Fake conntrack entry for untracked connections */
253 extern struct ip_conntrack ip_conntrack_untracked
;
255 /* Returns new sk_buff, or NULL */
257 ip_ct_gather_frags(struct sk_buff
*skb
, u_int32_t user
);
259 /* Iterate over all conntracks: if iter returns true, it's deleted. */
261 ip_ct_iterate_cleanup(int (*iter
)(struct ip_conntrack
*i
, void *data
),
264 extern struct ip_conntrack_helper
*
265 __ip_conntrack_helper_find_byname(const char *);
266 extern struct ip_conntrack_helper
*
267 ip_conntrack_helper_find_get(const struct ip_conntrack_tuple
*tuple
);
268 extern void ip_conntrack_helper_put(struct ip_conntrack_helper
*helper
);
270 extern struct ip_conntrack_protocol
*
271 __ip_conntrack_proto_find(u_int8_t protocol
);
272 extern struct ip_conntrack_protocol
*
273 ip_conntrack_proto_find_get(u_int8_t protocol
);
274 extern void ip_conntrack_proto_put(struct ip_conntrack_protocol
*proto
);
276 extern void ip_ct_remove_expectations(struct ip_conntrack
*ct
);
278 extern struct ip_conntrack
*ip_conntrack_alloc(struct ip_conntrack_tuple
*,
279 struct ip_conntrack_tuple
*);
281 extern void ip_conntrack_free(struct ip_conntrack
*ct
);
283 extern void ip_conntrack_hash_insert(struct ip_conntrack
*ct
);
285 extern struct ip_conntrack_expect
*
286 __ip_conntrack_expect_find(const struct ip_conntrack_tuple
*tuple
);
288 extern struct ip_conntrack_expect
*
289 ip_conntrack_expect_find(const struct ip_conntrack_tuple
*tuple
);
291 extern struct ip_conntrack_tuple_hash
*
292 __ip_conntrack_find(const struct ip_conntrack_tuple
*tuple
,
293 const struct ip_conntrack
*ignored_conntrack
);
295 extern void ip_conntrack_flush(void);
297 /* It's confirmed if it is, or has been in the hash table. */
298 static inline int is_confirmed(struct ip_conntrack
*ct
)
300 return test_bit(IPS_CONFIRMED_BIT
, &ct
->status
);
303 static inline int is_dying(struct ip_conntrack
*ct
)
305 return test_bit(IPS_DYING_BIT
, &ct
->status
);
308 extern unsigned int ip_conntrack_htable_size
;
309 extern int ip_conntrack_checksum
;
311 #define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
313 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
314 #include <linux/notifier.h>
315 #include <linux/interrupt.h>
317 struct ip_conntrack_ecache
{
318 struct ip_conntrack
*ct
;
321 DECLARE_PER_CPU(struct ip_conntrack_ecache
, ip_conntrack_ecache
);
323 #define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x)
325 extern struct atomic_notifier_head ip_conntrack_chain
;
326 extern struct atomic_notifier_head ip_conntrack_expect_chain
;
328 static inline int ip_conntrack_register_notifier(struct notifier_block
*nb
)
330 return atomic_notifier_chain_register(&ip_conntrack_chain
, nb
);
333 static inline int ip_conntrack_unregister_notifier(struct notifier_block
*nb
)
335 return atomic_notifier_chain_unregister(&ip_conntrack_chain
, nb
);
339 ip_conntrack_expect_register_notifier(struct notifier_block
*nb
)
341 return atomic_notifier_chain_register(&ip_conntrack_expect_chain
, nb
);
345 ip_conntrack_expect_unregister_notifier(struct notifier_block
*nb
)
347 return atomic_notifier_chain_unregister(&ip_conntrack_expect_chain
,
351 extern void ip_ct_deliver_cached_events(const struct ip_conntrack
*ct
);
352 extern void __ip_ct_event_cache_init(struct ip_conntrack
*ct
);
355 ip_conntrack_event_cache(enum ip_conntrack_events event
,
356 const struct sk_buff
*skb
)
358 struct ip_conntrack
*ct
= (struct ip_conntrack
*)skb
->nfct
;
359 struct ip_conntrack_ecache
*ecache
;
362 ecache
= &__get_cpu_var(ip_conntrack_ecache
);
363 if (ct
!= ecache
->ct
)
364 __ip_ct_event_cache_init(ct
);
365 ecache
->events
|= event
;
369 static inline void ip_conntrack_event(enum ip_conntrack_events event
,
370 struct ip_conntrack
*ct
)
372 if (is_confirmed(ct
) && !is_dying(ct
))
373 atomic_notifier_call_chain(&ip_conntrack_chain
, event
, ct
);
377 ip_conntrack_expect_event(enum ip_conntrack_expect_events event
,
378 struct ip_conntrack_expect
*exp
)
380 atomic_notifier_call_chain(&ip_conntrack_expect_chain
, event
, exp
);
382 #else /* CONFIG_IP_NF_CONNTRACK_EVENTS */
383 static inline void ip_conntrack_event_cache(enum ip_conntrack_events event
,
384 const struct sk_buff
*skb
) {}
385 static inline void ip_conntrack_event(enum ip_conntrack_events event
,
386 struct ip_conntrack
*ct
) {}
387 static inline void ip_ct_deliver_cached_events(const struct ip_conntrack
*ct
) {}
389 ip_conntrack_expect_event(enum ip_conntrack_expect_events event
,
390 struct ip_conntrack_expect
*exp
) {}
391 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
393 #ifdef CONFIG_IP_NF_NAT_NEEDED
394 static inline int ip_nat_initialized(struct ip_conntrack
*conntrack
,
395 enum ip_nat_manip_type manip
)
397 if (manip
== IP_NAT_MANIP_SRC
)
398 return test_bit(IPS_SRC_NAT_DONE_BIT
, &conntrack
->status
);
399 return test_bit(IPS_DST_NAT_DONE_BIT
, &conntrack
->status
);
401 #endif /* CONFIG_IP_NF_NAT_NEEDED */
403 #endif /* __KERNEL__ */
404 #endif /* _IP_CONNTRACK_H */