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)
125 #if defined(CONFIG_VNET) || defined(CONFIG_VNET_MODULE)
126 /* VServer context id */
127 xid_t xid[IP_CT_DIR_MAX];
129 /* Connection priority (pushed to skb->priority) */
130 /* Can be used directly by some classful qdiscs such as HTB */
134 /* Traversed often, so hopefully in different cacheline to top */
135 /* These are my tuples; original and reply */
136 struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
139 struct ip_conntrack_expect
141 /* Internal linked list (global expectation list) */
142 struct list_head list;
144 /* We expect this tuple, with the following mask */
145 struct ip_conntrack_tuple tuple, mask;
147 /* Function to call after setup and insertion */
148 void (*expectfn)(struct ip_conntrack *new,
149 struct ip_conntrack_expect *this);
151 /* The conntrack of the master connection */
152 struct ip_conntrack *master;
154 /* Timer function; deletes the expectation. */
155 struct timer_list timeout;
166 #ifdef CONFIG_IP_NF_NAT_NEEDED
167 /* This is the original per-proto part, used to map the
168 * expected connection the way the recipient expects. */
169 union ip_conntrack_manip_proto saved_proto;
170 /* Direction relative to the master connection. */
171 enum ip_conntrack_dir dir;
175 #define IP_CT_EXPECT_PERMANENT 0x1
177 static inline struct ip_conntrack *
178 tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
180 return container_of(hash, struct ip_conntrack,
181 tuplehash[hash->tuple.dst.dir]);
184 /* get master conntrack via master expectation */
185 #define master_ct(conntr) (conntr->master)
187 /* Alter reply tuple (maybe alter helper). */
189 ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
190 const struct ip_conntrack_tuple *newreply);
192 /* Is this tuple taken? (ignoring any belonging to the given
195 ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
196 const struct ip_conntrack *ignored_conntrack);
198 /* Return conntrack_info and tuple hash for given skb. */
199 static inline struct ip_conntrack *
200 ip_conntrack_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
202 *ctinfo = skb->nfctinfo;
203 return (struct ip_conntrack *)skb->nfct;
206 /* decrement reference count on a conntrack */
208 ip_conntrack_put(struct ip_conntrack *ct)
211 nf_conntrack_put(&ct->ct_general);
214 extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
215 const struct ip_conntrack_tuple *orig);
217 extern void __ip_ct_refresh_acct(struct ip_conntrack *ct,
218 enum ip_conntrack_info ctinfo,
219 const struct sk_buff *skb,
220 unsigned long extra_jiffies,
223 /* Refresh conntrack for this many jiffies and do accounting */
224 static inline void ip_ct_refresh_acct(struct ip_conntrack *ct,
225 enum ip_conntrack_info ctinfo,
226 const struct sk_buff *skb,
227 unsigned long extra_jiffies)
229 __ip_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
232 /* Refresh conntrack for this many jiffies */
233 static inline void ip_ct_refresh(struct ip_conntrack *ct,
234 const struct sk_buff *skb,
235 unsigned long extra_jiffies)
237 __ip_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
240 /* These are for NAT. Icky. */
241 /* Update TCP window tracking data when NAT mangles the packet */
242 extern void ip_conntrack_tcp_update(struct sk_buff *skb,
243 struct ip_conntrack *conntrack,
244 enum ip_conntrack_dir dir);
246 /* Call me when a conntrack is destroyed. */
247 extern void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack);
249 /* Fake conntrack entry for untracked connections */
250 extern struct ip_conntrack ip_conntrack_untracked;
252 /* Returns new sk_buff, or NULL */
254 ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);
256 /* Iterate over all conntracks: if iter returns true, it's deleted. */
258 ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
261 extern struct ip_conntrack_helper *
262 __ip_conntrack_helper_find_byname(const char *);
263 extern struct ip_conntrack_helper *
264 ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
265 extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);
267 extern struct ip_conntrack_protocol *
268 __ip_conntrack_proto_find(u_int8_t protocol);
269 extern struct ip_conntrack_protocol *
270 ip_conntrack_proto_find_get(u_int8_t protocol);
271 extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);
273 extern void ip_ct_remove_expectations(struct ip_conntrack *ct);
275 extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *,
276 struct ip_conntrack_tuple *);
278 extern void ip_conntrack_free(struct ip_conntrack *ct);
280 extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);
282 extern struct ip_conntrack_expect *
283 __ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
285 extern struct ip_conntrack_expect *
286 ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
288 extern struct ip_conntrack_tuple_hash *
289 __ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
290 const struct ip_conntrack *ignored_conntrack);
292 extern void ip_conntrack_flush(void);
294 /* It's confirmed if it is, or has been in the hash table. */
295 static inline int is_confirmed(struct ip_conntrack *ct)
297 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
300 static inline int is_dying(struct ip_conntrack *ct)
302 return test_bit(IPS_DYING_BIT, &ct->status);
305 extern unsigned int ip_conntrack_htable_size;
307 #define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
309 #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
310 #include <linux/notifier.h>
311 #include <linux/interrupt.h>
313 struct ip_conntrack_ecache {
314 struct ip_conntrack *ct;
317 DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
319 #define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x)
321 extern struct atomic_notifier_head ip_conntrack_chain;
322 extern struct atomic_notifier_head ip_conntrack_expect_chain;
324 static inline int ip_conntrack_register_notifier(struct notifier_block *nb)
326 return atomic_notifier_chain_register(&ip_conntrack_chain, nb);
329 static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb)
331 return atomic_notifier_chain_unregister(&ip_conntrack_chain, nb);
335 ip_conntrack_expect_register_notifier(struct notifier_block *nb)
337 return atomic_notifier_chain_register(&ip_conntrack_expect_chain, nb);
341 ip_conntrack_expect_unregister_notifier(struct notifier_block *nb)
343 return atomic_notifier_chain_unregister(&ip_conntrack_expect_chain,
347 extern void ip_ct_deliver_cached_events(const struct ip_conntrack *ct);
348 extern void __ip_ct_event_cache_init(struct ip_conntrack *ct);
351 ip_conntrack_event_cache(enum ip_conntrack_events event,
352 const struct sk_buff *skb)
354 struct ip_conntrack *ct = (struct ip_conntrack *)skb->nfct;
355 struct ip_conntrack_ecache *ecache;
358 ecache = &__get_cpu_var(ip_conntrack_ecache);
359 if (ct != ecache->ct)
360 __ip_ct_event_cache_init(ct);
361 ecache->events |= event;
365 static inline void ip_conntrack_event(enum ip_conntrack_events event,
366 struct ip_conntrack *ct)
368 if (is_confirmed(ct) && !is_dying(ct))
369 atomic_notifier_call_chain(&ip_conntrack_chain, event, ct);
373 ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
374 struct ip_conntrack_expect *exp)
376 atomic_notifier_call_chain(&ip_conntrack_expect_chain, event, exp);
378 #else /* CONFIG_IP_NF_CONNTRACK_EVENTS */
379 static inline void ip_conntrack_event_cache(enum ip_conntrack_events event,
380 const struct sk_buff *skb) {}
381 static inline void ip_conntrack_event(enum ip_conntrack_events event,
382 struct ip_conntrack *ct) {}
383 static inline void ip_ct_deliver_cached_events(const struct ip_conntrack *ct) {}
385 ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
386 struct ip_conntrack_expect *exp) {}
387 #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
389 #ifdef CONFIG_IP_NF_NAT_NEEDED
390 static inline int ip_nat_initialized(struct ip_conntrack *conntrack,
391 enum ip_nat_manip_type manip)
393 if (manip == IP_NAT_MANIP_SRC)
394 return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
395 return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
397 #endif /* CONFIG_IP_NF_NAT_NEEDED */
399 #endif /* __KERNEL__ */
400 #endif /* _IP_CONNTRACK_H */