1 #ifndef _IP_CONNTRACK_H
2 #define _IP_CONNTRACK_H
4 #include <linux/netfilter/nf_conntrack_common.h>
7 #include <linux/config.h>
8 #include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
9 #include <linux/bitops.h>
10 #include <linux/compiler.h>
11 #include <asm/atomic.h>
13 #include <linux/netfilter_ipv4/ip_conntrack_tcp.h>
14 #include <linux/netfilter_ipv4/ip_conntrack_icmp.h>
15 #include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
16 #include <linux/netfilter_ipv4/ip_conntrack_sctp.h>
18 /* per conntrack: protocol private data */
19 union ip_conntrack_proto {
20 /* insert conntrack proto private data here */
22 struct ip_ct_sctp sctp;
24 struct ip_ct_icmp icmp;
27 union ip_conntrack_expect_proto {
28 /* insert expect proto private data here */
31 /* Add protocol helper include file here */
32 #include <linux/netfilter_ipv4/ip_conntrack_h323.h>
33 #include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
34 #include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
35 #include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
36 #include <linux/netfilter_ipv4/ip_conntrack_irc.h>
38 /* per conntrack: application helper private data */
39 union ip_conntrack_help {
40 /* insert conntrack helper private data (master) here */
41 struct ip_ct_h323_master ct_h323_info;
42 struct ip_ct_pptp_master ct_pptp_info;
43 struct ip_ct_ftp_master ct_ftp_info;
44 struct ip_ct_irc_master ct_irc_info;
47 #ifdef CONFIG_IP_NF_NAT_NEEDED
48 #include <linux/netfilter_ipv4/ip_nat.h>
49 #include <linux/netfilter_ipv4/ip_nat_pptp.h>
51 /* per conntrack: nat application helper private data */
52 union ip_conntrack_nat_help {
53 /* insert nat helper private data here */
54 struct ip_nat_pptp nat_pptp_info;
58 #include <linux/types.h>
59 #include <linux/skbuff.h>
61 #ifdef CONFIG_NETFILTER_DEBUG
62 #define IP_NF_ASSERT(x) \
65 /* Wooah! I'm tripping my conntrack in a frenzy of \
67 printk("NF_IP_ASSERT: %s:%i(%s)\n", \
68 __FILE__, __LINE__, __FUNCTION__); \
71 #define IP_NF_ASSERT(x)
74 struct ip_conntrack_helper;
78 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
79 plus 1 for any connection(s) we are `master' for */
80 struct nf_conntrack ct_general;
82 /* Have we seen traffic both ways yet? (bitset) */
85 /* Timer function; drops refcnt when it goes off. */
86 struct timer_list timeout;
88 #ifdef CONFIG_IP_NF_CT_ACCT
89 /* Accounting Information (same cache line as other written members) */
90 struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
92 /* If we were expected by an expectation, this will be it */
93 struct ip_conntrack *master;
95 /* Current number of expected connections */
96 unsigned int expecting;
98 /* Unique ID that identifies this conntrack*/
101 /* Helper, if any. */
102 struct ip_conntrack_helper *helper;
104 /* Storage reserved for other modules: */
105 union ip_conntrack_proto proto;
107 union ip_conntrack_help help;
109 #ifdef CONFIG_IP_NF_NAT_NEEDED
111 struct ip_nat_info info;
112 union ip_conntrack_nat_help help;
113 #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
114 defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
118 #endif /* CONFIG_IP_NF_NAT_NEEDED */
120 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
124 /* Traversed often, so hopefully in different cacheline to top */
125 /* These are my tuples; original and reply */
126 struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
129 struct ip_conntrack_expect
131 /* Internal linked list (global expectation list) */
132 struct list_head list;
134 /* We expect this tuple, with the following mask */
135 struct ip_conntrack_tuple tuple, mask;
137 /* Function to call after setup and insertion */
138 void (*expectfn)(struct ip_conntrack *new,
139 struct ip_conntrack_expect *this);
141 /* The conntrack of the master connection */
142 struct ip_conntrack *master;
144 /* Timer function; deletes the expectation. */
145 struct timer_list timeout;
156 #ifdef CONFIG_IP_NF_NAT_NEEDED
157 /* This is the original per-proto part, used to map the
158 * expected connection the way the recipient expects. */
159 union ip_conntrack_manip_proto saved_proto;
160 /* Direction relative to the master connection. */
161 enum ip_conntrack_dir dir;
165 #define IP_CT_EXPECT_PERMANENT 0x1
167 static inline struct ip_conntrack *
168 tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
170 return container_of(hash, struct ip_conntrack,
171 tuplehash[hash->tuple.dst.dir]);
174 /* get master conntrack via master expectation */
175 #define master_ct(conntr) (conntr->master)
177 /* Alter reply tuple (maybe alter helper). */
179 ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
180 const struct ip_conntrack_tuple *newreply);
182 /* Is this tuple taken? (ignoring any belonging to the given
185 ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
186 const struct ip_conntrack *ignored_conntrack);
188 /* Return conntrack_info and tuple hash for given skb. */
189 static inline struct ip_conntrack *
190 ip_conntrack_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
192 *ctinfo = skb->nfctinfo;
193 return (struct ip_conntrack *)skb->nfct;
196 /* decrement reference count on a conntrack */
198 ip_conntrack_put(struct ip_conntrack *ct)
201 nf_conntrack_put(&ct->ct_general);
204 extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
205 const struct ip_conntrack_tuple *orig);
207 extern void __ip_ct_refresh_acct(struct ip_conntrack *ct,
208 enum ip_conntrack_info ctinfo,
209 const struct sk_buff *skb,
210 unsigned long extra_jiffies,
213 /* Refresh conntrack for this many jiffies and do accounting */
214 static inline void ip_ct_refresh_acct(struct ip_conntrack *ct,
215 enum ip_conntrack_info ctinfo,
216 const struct sk_buff *skb,
217 unsigned long extra_jiffies)
219 __ip_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
222 /* Refresh conntrack for this many jiffies */
223 static inline void ip_ct_refresh(struct ip_conntrack *ct,
224 const struct sk_buff *skb,
225 unsigned long extra_jiffies)
227 __ip_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
230 /* These are for NAT. Icky. */
231 /* Update TCP window tracking data when NAT mangles the packet */
232 extern void ip_conntrack_tcp_update(struct sk_buff *skb,
233 struct ip_conntrack *conntrack,
234 enum ip_conntrack_dir dir);
236 /* Call me when a conntrack is destroyed. */
237 extern void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack);
239 /* Fake conntrack entry for untracked connections */
240 extern struct ip_conntrack ip_conntrack_untracked;
242 /* Returns new sk_buff, or NULL */
244 ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);
246 /* Iterate over all conntracks: if iter returns true, it's deleted. */
248 ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
251 extern struct ip_conntrack_helper *
252 __ip_conntrack_helper_find_byname(const char *);
253 extern struct ip_conntrack_helper *
254 ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
255 extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);
257 extern struct ip_conntrack_protocol *
258 __ip_conntrack_proto_find(u_int8_t protocol);
259 extern struct ip_conntrack_protocol *
260 ip_conntrack_proto_find_get(u_int8_t protocol);
261 extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);
263 extern void ip_ct_remove_expectations(struct ip_conntrack *ct);
265 extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *,
266 struct ip_conntrack_tuple *);
268 extern void ip_conntrack_free(struct ip_conntrack *ct);
270 extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);
272 extern struct ip_conntrack_expect *
273 __ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
275 extern struct ip_conntrack_expect *
276 ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
278 extern struct ip_conntrack_tuple_hash *
279 __ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
280 const struct ip_conntrack *ignored_conntrack);
282 extern void ip_conntrack_flush(void);
284 /* It's confirmed if it is, or has been in the hash table. */
285 static inline int is_confirmed(struct ip_conntrack *ct)
287 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
290 static inline int is_dying(struct ip_conntrack *ct)
292 return test_bit(IPS_DYING_BIT, &ct->status);
295 extern unsigned int ip_conntrack_htable_size;
297 #define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
299 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
300 #include <linux/notifier.h>
301 #include <linux/interrupt.h>
303 struct ip_conntrack_ecache {
304 struct ip_conntrack *ct;
307 DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
309 #define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x)
311 extern struct atomic_notifier_head ip_conntrack_chain;
312 extern struct atomic_notifier_head ip_conntrack_expect_chain;
314 static inline int ip_conntrack_register_notifier(struct notifier_block *nb)
316 return atomic_notifier_chain_register(&ip_conntrack_chain, nb);
319 static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb)
321 return atomic_notifier_chain_unregister(&ip_conntrack_chain, nb);
325 ip_conntrack_expect_register_notifier(struct notifier_block *nb)
327 return atomic_notifier_chain_register(&ip_conntrack_expect_chain, nb);
331 ip_conntrack_expect_unregister_notifier(struct notifier_block *nb)
333 return atomic_notifier_chain_unregister(&ip_conntrack_expect_chain,
337 extern void ip_ct_deliver_cached_events(const struct ip_conntrack *ct);
338 extern void __ip_ct_event_cache_init(struct ip_conntrack *ct);
341 ip_conntrack_event_cache(enum ip_conntrack_events event,
342 const struct sk_buff *skb)
344 struct ip_conntrack *ct = (struct ip_conntrack *)skb->nfct;
345 struct ip_conntrack_ecache *ecache;
348 ecache = &__get_cpu_var(ip_conntrack_ecache);
349 if (ct != ecache->ct)
350 __ip_ct_event_cache_init(ct);
351 ecache->events |= event;
355 static inline void ip_conntrack_event(enum ip_conntrack_events event,
356 struct ip_conntrack *ct)
358 if (is_confirmed(ct) && !is_dying(ct))
359 atomic_notifier_call_chain(&ip_conntrack_chain, event, ct);
363 ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
364 struct ip_conntrack_expect *exp)
366 atomic_notifier_call_chain(&ip_conntrack_expect_chain, event, exp);
368 #else /* CONFIG_IP_NF_CONNTRACK_EVENTS */
369 static inline void ip_conntrack_event_cache(enum ip_conntrack_events event,
370 const struct sk_buff *skb) {}
371 static inline void ip_conntrack_event(enum ip_conntrack_events event,
372 struct ip_conntrack *ct) {}
373 static inline void ip_ct_deliver_cached_events(const struct ip_conntrack *ct) {}
375 ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
376 struct ip_conntrack_expect *exp) {}
377 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
379 #ifdef CONFIG_IP_NF_NAT_NEEDED
380 static inline int ip_nat_initialized(struct ip_conntrack *conntrack,
381 enum ip_nat_manip_type manip)
383 if (manip == IP_NAT_MANIP_SRC)
384 return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
385 return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
387 #endif /* CONFIG_IP_NF_NAT_NEEDED */
389 #endif /* __KERNEL__ */
390 #endif /* _IP_CONNTRACK_H */