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 /* Traversed often, so hopefully in different cacheline to top */
124 /* These are my tuples; original and reply */
125 struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
128 struct ip_conntrack_expect
130 /* Internal linked list (global expectation list) */
131 struct list_head list;
133 /* We expect this tuple, with the following mask */
134 struct ip_conntrack_tuple tuple, mask;
136 /* Function to call after setup and insertion */
137 void (*expectfn)(struct ip_conntrack *new,
138 struct ip_conntrack_expect *this);
140 /* The conntrack of the master connection */
141 struct ip_conntrack *master;
143 /* Timer function; deletes the expectation. */
144 struct timer_list timeout;
155 #ifdef CONFIG_IP_NF_NAT_NEEDED
156 /* This is the original per-proto part, used to map the
157 * expected connection the way the recipient expects. */
158 union ip_conntrack_manip_proto saved_proto;
159 /* Direction relative to the master connection. */
160 enum ip_conntrack_dir dir;
164 #define IP_CT_EXPECT_PERMANENT 0x1
166 static inline struct ip_conntrack *
167 tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
169 return container_of(hash, struct ip_conntrack,
170 tuplehash[hash->tuple.dst.dir]);
173 /* get master conntrack via master expectation */
174 #define master_ct(conntr) (conntr->master)
176 /* Alter reply tuple (maybe alter helper). */
178 ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
179 const struct ip_conntrack_tuple *newreply);
181 /* Is this tuple taken? (ignoring any belonging to the given
184 ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
185 const struct ip_conntrack *ignored_conntrack);
187 /* Return conntrack_info and tuple hash for given skb. */
188 static inline struct ip_conntrack *
189 ip_conntrack_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
191 *ctinfo = skb->nfctinfo;
192 return (struct ip_conntrack *)skb->nfct;
195 /* decrement reference count on a conntrack */
197 ip_conntrack_put(struct ip_conntrack *ct)
200 nf_conntrack_put(&ct->ct_general);
203 extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
204 const struct ip_conntrack_tuple *orig);
206 extern void __ip_ct_refresh_acct(struct ip_conntrack *ct,
207 enum ip_conntrack_info ctinfo,
208 const struct sk_buff *skb,
209 unsigned long extra_jiffies,
212 /* Refresh conntrack for this many jiffies and do accounting */
213 static inline void ip_ct_refresh_acct(struct ip_conntrack *ct,
214 enum ip_conntrack_info ctinfo,
215 const struct sk_buff *skb,
216 unsigned long extra_jiffies)
218 __ip_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
221 /* Refresh conntrack for this many jiffies */
222 static inline void ip_ct_refresh(struct ip_conntrack *ct,
223 const struct sk_buff *skb,
224 unsigned long extra_jiffies)
226 __ip_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
229 /* These are for NAT. Icky. */
230 /* Update TCP window tracking data when NAT mangles the packet */
231 extern void ip_conntrack_tcp_update(struct sk_buff *skb,
232 struct ip_conntrack *conntrack,
233 enum ip_conntrack_dir dir);
235 /* Call me when a conntrack is destroyed. */
236 extern void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack);
238 /* Fake conntrack entry for untracked connections */
239 extern struct ip_conntrack ip_conntrack_untracked;
241 /* Returns new sk_buff, or NULL */
243 ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);
245 /* Iterate over all conntracks: if iter returns true, it's deleted. */
247 ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
250 extern struct ip_conntrack_helper *
251 __ip_conntrack_helper_find_byname(const char *);
252 extern struct ip_conntrack_helper *
253 ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
254 extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);
256 extern struct ip_conntrack_protocol *
257 __ip_conntrack_proto_find(u_int8_t protocol);
258 extern struct ip_conntrack_protocol *
259 ip_conntrack_proto_find_get(u_int8_t protocol);
260 extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);
262 extern void ip_ct_remove_expectations(struct ip_conntrack *ct);
264 extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *,
265 struct ip_conntrack_tuple *);
267 extern void ip_conntrack_free(struct ip_conntrack *ct);
269 extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);
271 extern struct ip_conntrack_expect *
272 __ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
274 extern struct ip_conntrack_expect *
275 ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
277 extern struct ip_conntrack_tuple_hash *
278 __ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
279 const struct ip_conntrack *ignored_conntrack);
281 extern void ip_conntrack_flush(void);
283 /* It's confirmed if it is, or has been in the hash table. */
284 static inline int is_confirmed(struct ip_conntrack *ct)
286 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
289 static inline int is_dying(struct ip_conntrack *ct)
291 return test_bit(IPS_DYING_BIT, &ct->status);
294 extern unsigned int ip_conntrack_htable_size;
296 #define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
298 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
299 #include <linux/notifier.h>
300 #include <linux/interrupt.h>
302 struct ip_conntrack_ecache {
303 struct ip_conntrack *ct;
306 DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
308 #define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x)
310 extern struct atomic_notifier_head ip_conntrack_chain;
311 extern struct atomic_notifier_head ip_conntrack_expect_chain;
313 static inline int ip_conntrack_register_notifier(struct notifier_block *nb)
315 return atomic_notifier_chain_register(&ip_conntrack_chain, nb);
318 static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb)
320 return atomic_notifier_chain_unregister(&ip_conntrack_chain, nb);
324 ip_conntrack_expect_register_notifier(struct notifier_block *nb)
326 return atomic_notifier_chain_register(&ip_conntrack_expect_chain, nb);
330 ip_conntrack_expect_unregister_notifier(struct notifier_block *nb)
332 return atomic_notifier_chain_unregister(&ip_conntrack_expect_chain,
336 extern void ip_ct_deliver_cached_events(const struct ip_conntrack *ct);
337 extern void __ip_ct_event_cache_init(struct ip_conntrack *ct);
340 ip_conntrack_event_cache(enum ip_conntrack_events event,
341 const struct sk_buff *skb)
343 struct ip_conntrack *ct = (struct ip_conntrack *)skb->nfct;
344 struct ip_conntrack_ecache *ecache;
347 ecache = &__get_cpu_var(ip_conntrack_ecache);
348 if (ct != ecache->ct)
349 __ip_ct_event_cache_init(ct);
350 ecache->events |= event;
354 static inline void ip_conntrack_event(enum ip_conntrack_events event,
355 struct ip_conntrack *ct)
357 if (is_confirmed(ct) && !is_dying(ct))
358 atomic_notifier_call_chain(&ip_conntrack_chain, event, ct);
362 ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
363 struct ip_conntrack_expect *exp)
365 atomic_notifier_call_chain(&ip_conntrack_expect_chain, event, exp);
367 #else /* CONFIG_IP_NF_CONNTRACK_EVENTS */
368 static inline void ip_conntrack_event_cache(enum ip_conntrack_events event,
369 const struct sk_buff *skb) {}
370 static inline void ip_conntrack_event(enum ip_conntrack_events event,
371 struct ip_conntrack *ct) {}
372 static inline void ip_ct_deliver_cached_events(const struct ip_conntrack *ct) {}
374 ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
375 struct ip_conntrack_expect *exp) {}
376 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
378 #ifdef CONFIG_IP_NF_NAT_NEEDED
379 static inline int ip_nat_initialized(struct ip_conntrack *conntrack,
380 enum ip_nat_manip_type manip)
382 if (manip == IP_NAT_MANIP_SRC)
383 return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
384 return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
386 #endif /* CONFIG_IP_NF_NAT_NEEDED */
388 #endif /* __KERNEL__ */
389 #endif /* _IP_CONNTRACK_H */