2 * Connection state tracking for netfilter. This is separated from,
3 * but required by, the (future) NAT layer; it can also be used by an iptables
6 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
7 * - generalize L3 protocol dependent part.
9 * Derived from include/linux/netfiter_ipv4/ip_conntrack.h
12 #ifndef _NF_CONNTRACK_H
13 #define _NF_CONNTRACK_H
15 #include <linux/netfilter/nf_conntrack_common.h>
18 #include <linux/bitops.h>
19 #include <linux/compiler.h>
20 #include <asm/atomic.h>
22 #include <linux/netfilter/nf_conntrack_tcp.h>
23 #include <linux/netfilter/nf_conntrack_sctp.h>
24 #include <linux/netfilter/nf_conntrack_proto_gre.h>
25 #include <net/netfilter/ipv4/nf_conntrack_icmp.h>
26 #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
28 #include <net/netfilter/nf_conntrack_tuple.h>
30 /* per conntrack: protocol private data */
31 union nf_conntrack_proto
{
32 /* insert conntrack proto private data here */
33 struct ip_ct_sctp sctp
;
35 struct ip_ct_icmp icmp
;
36 struct nf_ct_icmpv6 icmpv6
;
40 union nf_conntrack_expect_proto
{
41 /* insert expect proto private data here */
44 /* Add protocol helper include file here */
45 #include <linux/netfilter/nf_conntrack_ftp.h>
46 #include <linux/netfilter/nf_conntrack_pptp.h>
47 #include <linux/netfilter/nf_conntrack_h323.h>
49 /* per conntrack: application helper private data */
50 union nf_conntrack_help
{
51 /* insert conntrack helper private data (master) here */
52 struct nf_ct_ftp_master ct_ftp_info
;
53 struct nf_ct_pptp_master ct_pptp_info
;
54 struct nf_ct_h323_master ct_h323_info
;
57 #include <linux/types.h>
58 #include <linux/skbuff.h>
59 #include <linux/timer.h>
61 #ifdef CONFIG_NETFILTER_DEBUG
62 #define NF_CT_ASSERT(x) \
65 /* Wooah! I'm tripping my conntrack in a frenzy of \
67 printk("NF_CT_ASSERT: %s:%i(%s)\n", \
68 __FILE__, __LINE__, __FUNCTION__); \
71 #define NF_CT_ASSERT(x)
74 struct nf_conntrack_helper
;
76 /* nf_conn feature for connections that have a helper */
79 struct nf_conntrack_helper
*helper
;
81 union nf_conntrack_help help
;
83 /* Current number of expected connections */
84 unsigned int expecting
;
88 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
89 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
93 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
94 plus 1 for any connection(s) we are `master' for */
95 struct nf_conntrack ct_general
;
97 /* XXX should I move this to the tail ? - Y.K */
98 /* These are my tuples; original and reply */
99 struct nf_conntrack_tuple_hash tuplehash
[IP_CT_DIR_MAX
];
101 /* Have we seen traffic both ways yet? (bitset) */
102 unsigned long status
;
104 /* If we were expected by an expectation, this will be it */
105 struct nf_conn
*master
;
107 /* Timer function; drops refcnt when it goes off. */
108 struct timer_list timeout
;
110 #ifdef CONFIG_NF_CT_ACCT
111 /* Accounting Information (same cache line as other written members) */
112 struct ip_conntrack_counter counters
[IP_CT_DIR_MAX
];
115 /* Unique ID that identifies this conntrack*/
118 /* features - nat, helper, ... used by allocating system */
121 #if defined(CONFIG_NF_CONNTRACK_MARK)
125 #ifdef CONFIG_NF_CONNTRACK_SECMARK
129 /* Storage reserved for other modules: */
130 union nf_conntrack_proto proto
;
132 /* features dynamically at the end: helper, nat (both optional) */
136 static inline struct nf_conn
*
137 nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash
*hash
)
139 return container_of(hash
, struct nf_conn
,
140 tuplehash
[hash
->tuple
.dst
.dir
]);
143 /* get master conntrack via master expectation */
144 #define master_ct(conntr) (conntr->master)
146 /* Alter reply tuple (maybe alter helper). */
148 nf_conntrack_alter_reply(struct nf_conn
*conntrack
,
149 const struct nf_conntrack_tuple
*newreply
);
151 /* Is this tuple taken? (ignoring any belonging to the given
154 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple
*tuple
,
155 const struct nf_conn
*ignored_conntrack
);
157 /* Return conntrack_info and tuple hash for given skb. */
158 static inline struct nf_conn
*
159 nf_ct_get(const struct sk_buff
*skb
, enum ip_conntrack_info
*ctinfo
)
161 *ctinfo
= skb
->nfctinfo
;
162 return (struct nf_conn
*)skb
->nfct
;
165 /* decrement reference count on a conntrack */
166 static inline void nf_ct_put(struct nf_conn
*ct
)
169 nf_conntrack_put(&ct
->ct_general
);
172 /* Protocol module loading */
173 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto
);
174 extern void nf_ct_l3proto_module_put(unsigned short l3proto
);
176 extern struct nf_conntrack_tuple_hash
*
177 __nf_conntrack_find(const struct nf_conntrack_tuple
*tuple
,
178 const struct nf_conn
*ignored_conntrack
);
180 extern void nf_conntrack_hash_insert(struct nf_conn
*ct
);
182 extern void nf_conntrack_flush(void);
184 extern struct nf_conntrack_helper
*
185 nf_ct_helper_find_get( const struct nf_conntrack_tuple
*tuple
);
186 extern void nf_ct_helper_put(struct nf_conntrack_helper
*helper
);
188 extern struct nf_conntrack_helper
*
189 __nf_conntrack_helper_find_byname(const char *name
);
191 extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple
*inverse
,
192 const struct nf_conntrack_tuple
*orig
);
194 extern void __nf_ct_refresh_acct(struct nf_conn
*ct
,
195 enum ip_conntrack_info ctinfo
,
196 const struct sk_buff
*skb
,
197 unsigned long extra_jiffies
,
200 /* Refresh conntrack for this many jiffies and do accounting */
201 static inline void nf_ct_refresh_acct(struct nf_conn
*ct
,
202 enum ip_conntrack_info ctinfo
,
203 const struct sk_buff
*skb
,
204 unsigned long extra_jiffies
)
206 __nf_ct_refresh_acct(ct
, ctinfo
, skb
, extra_jiffies
, 1);
209 /* Refresh conntrack for this many jiffies */
210 static inline void nf_ct_refresh(struct nf_conn
*ct
,
211 const struct sk_buff
*skb
,
212 unsigned long extra_jiffies
)
214 __nf_ct_refresh_acct(ct
, 0, skb
, extra_jiffies
, 0);
217 /* These are for NAT. Icky. */
218 /* Update TCP window tracking data when NAT mangles the packet */
219 extern void nf_conntrack_tcp_update(struct sk_buff
*skb
,
220 unsigned int dataoff
,
221 struct nf_conn
*conntrack
,
224 /* Call me when a conntrack is destroyed. */
225 extern void (*nf_conntrack_destroyed
)(struct nf_conn
*conntrack
);
227 /* Fake conntrack entry for untracked connections */
228 extern struct nf_conn nf_conntrack_untracked
;
230 extern int nf_ct_no_defrag
;
232 /* Iterate over all conntracks: if iter returns true, it's deleted. */
234 nf_ct_iterate_cleanup(int (*iter
)(struct nf_conn
*i
, void *data
), void *data
);
235 extern void nf_conntrack_free(struct nf_conn
*ct
);
236 extern struct nf_conn
*
237 nf_conntrack_alloc(const struct nf_conntrack_tuple
*orig
,
238 const struct nf_conntrack_tuple
*repl
);
240 /* It's confirmed if it is, or has been in the hash table. */
241 static inline int nf_ct_is_confirmed(struct nf_conn
*ct
)
243 return test_bit(IPS_CONFIRMED_BIT
, &ct
->status
);
246 static inline int nf_ct_is_dying(struct nf_conn
*ct
)
248 return test_bit(IPS_DYING_BIT
, &ct
->status
);
251 extern unsigned int nf_conntrack_htable_size
;
252 extern int nf_conntrack_checksum
;
253 extern atomic_t nf_conntrack_count
;
254 extern int nf_conntrack_max
;
256 DECLARE_PER_CPU(struct ip_conntrack_stat
, nf_conntrack_stat
);
257 #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
259 /* no helper, no nat */
260 #define NF_CT_F_BASIC 0
262 #define NF_CT_F_HELP 1
264 #define NF_CT_F_NAT 2
265 #define NF_CT_F_NUM 4
268 nf_conntrack_register_cache(u_int32_t features
, const char *name
, size_t size
);
270 nf_conntrack_unregister_cache(u_int32_t features
);
272 /* valid combinations:
273 * basic: nf_conn, nf_conn .. nf_conn_help
274 * nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat .. nf_conn help
276 #ifdef CONFIG_NF_NAT_NEEDED
277 static inline struct nf_conn_nat
*nfct_nat(const struct nf_conn
*ct
)
279 unsigned int offset
= sizeof(struct nf_conn
);
281 if (!(ct
->features
& NF_CT_F_NAT
))
284 offset
= ALIGN(offset
, __alignof__(struct nf_conn_nat
));
285 return (struct nf_conn_nat
*) ((void *)ct
+ offset
);
288 static inline struct nf_conn_help
*nfct_help(const struct nf_conn
*ct
)
290 unsigned int offset
= sizeof(struct nf_conn
);
292 if (!(ct
->features
& NF_CT_F_HELP
))
294 if (ct
->features
& NF_CT_F_NAT
) {
295 offset
= ALIGN(offset
, __alignof__(struct nf_conn_nat
));
296 offset
+= sizeof(struct nf_conn_nat
);
299 offset
= ALIGN(offset
, __alignof__(struct nf_conn_help
));
300 return (struct nf_conn_help
*) ((void *)ct
+ offset
);
303 static inline struct nf_conn_help
*nfct_help(const struct nf_conn
*ct
)
305 unsigned int offset
= sizeof(struct nf_conn
);
307 if (!(ct
->features
& NF_CT_F_HELP
))
310 offset
= ALIGN(offset
, __alignof__(struct nf_conn_help
));
311 return (struct nf_conn_help
*) ((void *)ct
+ offset
);
313 #endif /* CONFIG_NF_NAT_NEEDED */
314 #endif /* __KERNEL__ */
315 #endif /* _NF_CONNTRACK_H */