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_dccp.h>
24 #include <linux/netfilter/nf_conntrack_sctp.h>
25 #include <linux/netfilter/nf_conntrack_proto_gre.h>
26 #include <net/netfilter/ipv4/nf_conntrack_icmp.h>
27 #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
29 #include <net/netfilter/nf_conntrack_tuple.h>
31 /* per conntrack: protocol private data */
32 union nf_conntrack_proto
{
33 /* insert conntrack proto private data here */
34 struct nf_ct_dccp dccp
;
35 struct ip_ct_sctp sctp
;
37 struct ip_ct_icmp icmp
;
38 struct nf_ct_icmpv6 icmpv6
;
42 union nf_conntrack_expect_proto
{
43 /* insert expect proto private data here */
46 /* Add protocol helper include file here */
47 #include <linux/netfilter/nf_conntrack_ftp.h>
48 #include <linux/netfilter/nf_conntrack_pptp.h>
49 #include <linux/netfilter/nf_conntrack_h323.h>
50 #include <linux/netfilter/nf_conntrack_sane.h>
51 #include <linux/netfilter/nf_conntrack_sip.h>
53 /* per conntrack: application helper private data */
54 union nf_conntrack_help
{
55 /* insert conntrack helper private data (master) here */
56 struct nf_ct_ftp_master ct_ftp_info
;
57 struct nf_ct_pptp_master ct_pptp_info
;
58 struct nf_ct_h323_master ct_h323_info
;
59 struct nf_ct_sane_master ct_sane_info
;
60 struct nf_ct_sip_master ct_sip_info
;
63 #include <linux/types.h>
64 #include <linux/skbuff.h>
65 #include <linux/timer.h>
67 #ifdef CONFIG_NETFILTER_DEBUG
68 #define NF_CT_ASSERT(x) WARN_ON(!(x))
70 #define NF_CT_ASSERT(x)
73 struct nf_conntrack_helper
;
75 /* Must be kept in sync with the classes defined by helpers */
76 #define NF_CT_MAX_EXPECT_CLASSES 3
78 /* nf_conn feature for connections that have a helper */
81 struct nf_conntrack_helper
*helper
;
83 union nf_conntrack_help help
;
85 struct hlist_head expectations
;
87 /* Current number of expected connections */
88 u8 expecting
[NF_CT_MAX_EXPECT_CLASSES
];
91 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
92 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
96 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
97 plus 1 for any connection(s) we are `master' for */
98 struct nf_conntrack ct_general
;
100 /* XXX should I move this to the tail ? - Y.K */
101 /* These are my tuples; original and reply */
102 struct nf_conntrack_tuple_hash tuplehash
[IP_CT_DIR_MAX
];
104 /* Have we seen traffic both ways yet? (bitset) */
105 unsigned long status
;
107 /* If we were expected by an expectation, this will be it */
108 struct nf_conn
*master
;
110 /* Timer function; drops refcnt when it goes off. */
111 struct timer_list timeout
;
113 #if defined(CONFIG_NF_CONNTRACK_MARK)
117 #ifdef CONFIG_NF_CONNTRACK_SECMARK
121 /* Storage reserved for other modules: */
122 union nf_conntrack_proto proto
;
125 struct nf_ct_ext
*ext
;
130 static inline struct nf_conn
*
131 nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash
*hash
)
133 return container_of(hash
, struct nf_conn
,
134 tuplehash
[hash
->tuple
.dst
.dir
]);
137 static inline u_int16_t
nf_ct_l3num(const struct nf_conn
*ct
)
139 return ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
142 static inline u_int8_t
nf_ct_protonum(const struct nf_conn
*ct
)
144 return ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
147 /* get master conntrack via master expectation */
148 #define master_ct(conntr) (conntr->master)
150 /* Alter reply tuple (maybe alter helper). */
152 nf_conntrack_alter_reply(struct nf_conn
*ct
,
153 const struct nf_conntrack_tuple
*newreply
);
155 /* Is this tuple taken? (ignoring any belonging to the given
158 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple
*tuple
,
159 const struct nf_conn
*ignored_conntrack
);
161 /* Return conntrack_info and tuple hash for given skb. */
162 static inline struct nf_conn
*
163 nf_ct_get(const struct sk_buff
*skb
, enum ip_conntrack_info
*ctinfo
)
165 *ctinfo
= skb
->nfctinfo
;
166 return (struct nf_conn
*)skb
->nfct
;
169 /* decrement reference count on a conntrack */
170 static inline void nf_ct_put(struct nf_conn
*ct
)
173 nf_conntrack_put(&ct
->ct_general
);
176 /* Protocol module loading */
177 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto
);
178 extern void nf_ct_l3proto_module_put(unsigned short l3proto
);
180 extern struct hlist_head
*nf_ct_alloc_hashtable(unsigned int *sizep
, int *vmalloced
);
181 extern void nf_ct_free_hashtable(struct hlist_head
*hash
, int vmalloced
,
184 extern struct nf_conntrack_tuple_hash
*
185 __nf_conntrack_find(const struct nf_conntrack_tuple
*tuple
);
187 extern void nf_conntrack_hash_insert(struct nf_conn
*ct
);
189 extern void nf_conntrack_flush(void);
191 extern bool nf_ct_get_tuplepr(const struct sk_buff
*skb
,
192 unsigned int nhoff
, u_int16_t l3num
,
193 struct nf_conntrack_tuple
*tuple
);
194 extern bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple
*inverse
,
195 const struct nf_conntrack_tuple
*orig
);
197 extern void __nf_ct_refresh_acct(struct nf_conn
*ct
,
198 enum ip_conntrack_info ctinfo
,
199 const struct sk_buff
*skb
,
200 unsigned long extra_jiffies
,
203 /* Refresh conntrack for this many jiffies and do accounting */
204 static inline void nf_ct_refresh_acct(struct nf_conn
*ct
,
205 enum ip_conntrack_info ctinfo
,
206 const struct sk_buff
*skb
,
207 unsigned long extra_jiffies
)
209 __nf_ct_refresh_acct(ct
, ctinfo
, skb
, extra_jiffies
, 1);
212 /* Refresh conntrack for this many jiffies */
213 static inline void nf_ct_refresh(struct nf_conn
*ct
,
214 const struct sk_buff
*skb
,
215 unsigned long extra_jiffies
)
217 __nf_ct_refresh_acct(ct
, 0, skb
, extra_jiffies
, 0);
220 extern bool __nf_ct_kill_acct(struct nf_conn
*ct
,
221 enum ip_conntrack_info ctinfo
,
222 const struct sk_buff
*skb
,
225 /* kill conntrack and do accounting */
226 static inline bool nf_ct_kill_acct(struct nf_conn
*ct
,
227 enum ip_conntrack_info ctinfo
,
228 const struct sk_buff
*skb
)
230 return __nf_ct_kill_acct(ct
, ctinfo
, skb
, 1);
233 /* kill conntrack without accounting */
234 static inline bool nf_ct_kill(struct nf_conn
*ct
)
236 return __nf_ct_kill_acct(ct
, 0, NULL
, 0);
239 /* These are for NAT. Icky. */
240 /* Update TCP window tracking data when NAT mangles the packet */
241 extern void nf_conntrack_tcp_update(const struct sk_buff
*skb
,
242 unsigned int dataoff
,
246 /* Fake conntrack entry for untracked connections */
247 extern struct nf_conn nf_conntrack_untracked
;
249 /* Iterate over all conntracks: if iter returns true, it's deleted. */
251 nf_ct_iterate_cleanup(int (*iter
)(struct nf_conn
*i
, void *data
), void *data
);
252 extern void nf_conntrack_free(struct nf_conn
*ct
);
253 extern struct nf_conn
*
254 nf_conntrack_alloc(const struct nf_conntrack_tuple
*orig
,
255 const struct nf_conntrack_tuple
*repl
,
258 /* It's confirmed if it is, or has been in the hash table. */
259 static inline int nf_ct_is_confirmed(struct nf_conn
*ct
)
261 return test_bit(IPS_CONFIRMED_BIT
, &ct
->status
);
264 static inline int nf_ct_is_dying(struct nf_conn
*ct
)
266 return test_bit(IPS_DYING_BIT
, &ct
->status
);
269 static inline int nf_ct_is_untracked(const struct sk_buff
*skb
)
271 return (skb
->nfct
== &nf_conntrack_untracked
.ct_general
);
274 extern int nf_conntrack_set_hashsize(const char *val
, struct kernel_param
*kp
);
275 extern unsigned int nf_conntrack_htable_size
;
276 extern int nf_conntrack_checksum
;
277 extern atomic_t nf_conntrack_count
;
278 extern int nf_conntrack_max
;
280 DECLARE_PER_CPU(struct ip_conntrack_stat
, nf_conntrack_stat
);
281 #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
282 #define NF_CT_STAT_INC_ATOMIC(count) \
284 local_bh_disable(); \
285 __get_cpu_var(nf_conntrack_stat).count++; \
289 #endif /* __KERNEL__ */
290 #endif /* _NF_CONNTRACK_H */