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_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_pptp_master ct_pptp_info;
41 struct ip_ct_ftp_master ct_ftp_info;
42 struct ip_ct_irc_master ct_irc_info;
45 #ifdef CONFIG_IP_NF_NAT_NEEDED
46 #include <linux/netfilter_ipv4/ip_nat.h>
47 #include <linux/netfilter_ipv4/ip_nat_pptp.h>
49 /* per conntrack: nat application helper private data */
50 union ip_conntrack_nat_help {
51 /* insert nat helper private data here */
52 struct ip_nat_pptp nat_pptp_info;
56 #include <linux/types.h>
57 #include <linux/skbuff.h>
59 #ifdef CONFIG_NETFILTER_DEBUG
60 #define IP_NF_ASSERT(x) \
63 /* Wooah! I'm tripping my conntrack in a frenzy of \
65 printk("NF_IP_ASSERT: %s:%i(%s)\n", \
66 __FILE__, __LINE__, __FUNCTION__); \
69 #define IP_NF_ASSERT(x)
72 struct ip_conntrack_helper;
76 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
77 plus 1 for any connection(s) we are `master' for */
78 struct nf_conntrack ct_general;
80 /* Have we seen traffic both ways yet? (bitset) */
83 /* Timer function; drops refcnt when it goes off. */
84 struct timer_list timeout;
86 #ifdef CONFIG_IP_NF_CT_ACCT
87 /* Accounting Information (same cache line as other written members) */
88 struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
90 /* If we were expected by an expectation, this will be it */
91 struct ip_conntrack *master;
93 /* Current number of expected connections */
94 unsigned int expecting;
96 /* Unique ID that identifies this conntrack*/
100 struct ip_conntrack_helper *helper;
102 /* Storage reserved for other modules: */
103 union ip_conntrack_proto proto;
105 union ip_conntrack_help help;
107 #ifdef CONFIG_IP_NF_NAT_NEEDED
109 struct ip_nat_info info;
110 union ip_conntrack_nat_help help;
111 #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
112 defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
116 #endif /* CONFIG_IP_NF_NAT_NEEDED */
118 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
122 /* Traversed often, so hopefully in different cacheline to top */
123 /* These are my tuples; original and reply */
124 struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
127 struct ip_conntrack_expect
129 /* Internal linked list (global expectation list) */
130 struct list_head list;
132 /* We expect this tuple, with the following mask */
133 struct ip_conntrack_tuple tuple, mask;
135 /* Function to call after setup and insertion */
136 void (*expectfn)(struct ip_conntrack *new,
137 struct ip_conntrack_expect *this);
139 /* The conntrack of the master connection */
140 struct ip_conntrack *master;
142 /* Timer function; deletes the expectation. */
143 struct timer_list timeout;
154 #ifdef CONFIG_IP_NF_NAT_NEEDED
155 /* This is the original per-proto part, used to map the
156 * expected connection the way the recipient expects. */
157 union ip_conntrack_manip_proto saved_proto;
158 /* Direction relative to the master connection. */
159 enum ip_conntrack_dir dir;
163 #define IP_CT_EXPECT_PERMANENT 0x1
165 static inline struct ip_conntrack *
166 tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
168 return container_of(hash, struct ip_conntrack,
169 tuplehash[hash->tuple.dst.dir]);
172 /* get master conntrack via master expectation */
173 #define master_ct(conntr) (conntr->master)
175 /* Alter reply tuple (maybe alter helper). */
177 ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
178 const struct ip_conntrack_tuple *newreply);
180 /* Is this tuple taken? (ignoring any belonging to the given
183 ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
184 const struct ip_conntrack *ignored_conntrack);
186 /* Return conntrack_info and tuple hash for given skb. */
187 static inline struct ip_conntrack *
188 ip_conntrack_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
190 *ctinfo = skb->nfctinfo;
191 return (struct ip_conntrack *)skb->nfct;
194 /* decrement reference count on a conntrack */
196 ip_conntrack_put(struct ip_conntrack *ct)
199 nf_conntrack_put(&ct->ct_general);
202 /* call to create an explicit dependency on ip_conntrack. */
203 extern void need_ip_conntrack(void);
205 extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
206 const struct ip_conntrack_tuple *orig);
208 extern void __ip_ct_refresh_acct(struct ip_conntrack *ct,
209 enum ip_conntrack_info ctinfo,
210 const struct sk_buff *skb,
211 unsigned long extra_jiffies,
214 /* Refresh conntrack for this many jiffies and do accounting */
215 static inline void ip_ct_refresh_acct(struct ip_conntrack *ct,
216 enum ip_conntrack_info ctinfo,
217 const struct sk_buff *skb,
218 unsigned long extra_jiffies)
220 __ip_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
223 /* Refresh conntrack for this many jiffies */
224 static inline void ip_ct_refresh(struct ip_conntrack *ct,
225 const struct sk_buff *skb,
226 unsigned long extra_jiffies)
228 __ip_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
231 /* These are for NAT. Icky. */
232 /* Update TCP window tracking data when NAT mangles the packet */
233 extern void ip_conntrack_tcp_update(struct sk_buff *skb,
234 struct ip_conntrack *conntrack,
235 enum ip_conntrack_dir dir);
237 /* Call me when a conntrack is destroyed. */
238 extern void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack);
240 /* Fake conntrack entry for untracked connections */
241 extern struct ip_conntrack ip_conntrack_untracked;
243 /* Returns new sk_buff, or NULL */
245 ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);
247 /* Iterate over all conntracks: if iter returns true, it's deleted. */
249 ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
252 extern struct ip_conntrack_helper *
253 __ip_conntrack_helper_find_byname(const char *);
254 extern struct ip_conntrack_helper *
255 ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
256 extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);
258 extern struct ip_conntrack_protocol *
259 __ip_conntrack_proto_find(u_int8_t protocol);
260 extern struct ip_conntrack_protocol *
261 ip_conntrack_proto_find_get(u_int8_t protocol);
262 extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);
264 extern void ip_ct_remove_expectations(struct ip_conntrack *ct);
266 extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *,
267 struct ip_conntrack_tuple *);
269 extern void ip_conntrack_free(struct ip_conntrack *ct);
271 extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);
273 extern struct ip_conntrack_expect *
274 __ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
276 extern struct ip_conntrack_expect *
277 ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
279 extern struct ip_conntrack_tuple_hash *
280 __ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
281 const struct ip_conntrack *ignored_conntrack);
283 extern void ip_conntrack_flush(void);
285 /* It's confirmed if it is, or has been in the hash table. */
286 static inline int is_confirmed(struct ip_conntrack *ct)
288 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
291 static inline int is_dying(struct ip_conntrack *ct)
293 return test_bit(IPS_DYING_BIT, &ct->status);
296 extern unsigned int ip_conntrack_htable_size;
298 #define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
300 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
301 #include <linux/notifier.h>
302 #include <linux/interrupt.h>
304 struct ip_conntrack_ecache {
305 struct ip_conntrack *ct;
308 DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
310 #define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x)
312 extern struct notifier_block *ip_conntrack_chain;
313 extern struct notifier_block *ip_conntrack_expect_chain;
315 static inline int ip_conntrack_register_notifier(struct notifier_block *nb)
317 return notifier_chain_register(&ip_conntrack_chain, nb);
320 static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb)
322 return notifier_chain_unregister(&ip_conntrack_chain, nb);
326 ip_conntrack_expect_register_notifier(struct notifier_block *nb)
328 return notifier_chain_register(&ip_conntrack_expect_chain, nb);
332 ip_conntrack_expect_unregister_notifier(struct notifier_block *nb)
334 return notifier_chain_unregister(&ip_conntrack_expect_chain, nb);
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 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 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 */