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/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 nf_ct_dccp dccp
;
34 struct ip_ct_sctp sctp
;
39 union nf_conntrack_expect_proto
{
40 /* insert expect proto private data here */
43 /* Add protocol helper include file here */
44 #include <linux/netfilter/nf_conntrack_ftp.h>
45 #include <linux/netfilter/nf_conntrack_pptp.h>
46 #include <linux/netfilter/nf_conntrack_h323.h>
47 #include <linux/netfilter/nf_conntrack_sane.h>
48 #include <linux/netfilter/nf_conntrack_sip.h>
50 /* per conntrack: application helper private data */
51 union nf_conntrack_help
{
52 /* insert conntrack helper private data (master) here */
53 struct nf_ct_ftp_master ct_ftp_info
;
54 struct nf_ct_pptp_master ct_pptp_info
;
55 struct nf_ct_h323_master ct_h323_info
;
56 struct nf_ct_sane_master ct_sane_info
;
57 struct nf_ct_sip_master ct_sip_info
;
60 #include <linux/types.h>
61 #include <linux/skbuff.h>
62 #include <linux/timer.h>
64 #ifdef CONFIG_NETFILTER_DEBUG
65 #define NF_CT_ASSERT(x) WARN_ON(!(x))
67 #define NF_CT_ASSERT(x)
70 struct nf_conntrack_helper
;
72 /* Must be kept in sync with the classes defined by helpers */
73 #define NF_CT_MAX_EXPECT_CLASSES 4
75 /* nf_conn feature for connections that have a helper */
78 struct nf_conntrack_helper __rcu
*helper
;
80 union nf_conntrack_help help
;
82 struct hlist_head expectations
;
84 /* Current number of expected connections */
85 u8 expecting
[NF_CT_MAX_EXPECT_CLASSES
];
88 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
89 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
92 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
93 plus 1 for any connection(s) we are `master' for */
94 struct nf_conntrack ct_general
;
98 /* XXX should I move this to the tail ? - Y.K */
99 /* These are my tuples; original and reply */
100 struct nf_conntrack_tuple_hash tuplehash
[IP_CT_DIR_MAX
];
102 /* Have we seen traffic both ways yet? (bitset) */
103 unsigned long status
;
105 /* If we were expected by an expectation, this will be it */
106 struct nf_conn
*master
;
108 /* Timer function; drops refcnt when it goes off. */
109 struct timer_list timeout
;
111 #if defined(CONFIG_NF_CONNTRACK_MARK)
115 #ifdef CONFIG_NF_CONNTRACK_SECMARK
119 /* Storage reserved for other modules: */
120 union nf_conntrack_proto proto
;
123 struct nf_ct_ext
*ext
;
129 static inline struct nf_conn
*
130 nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash
*hash
)
132 return container_of(hash
, struct nf_conn
,
133 tuplehash
[hash
->tuple
.dst
.dir
]);
136 static inline u_int16_t
nf_ct_l3num(const struct nf_conn
*ct
)
138 return ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.src
.l3num
;
141 static inline u_int8_t
nf_ct_protonum(const struct nf_conn
*ct
)
143 return ct
->tuplehash
[IP_CT_DIR_ORIGINAL
].tuple
.dst
.protonum
;
146 #define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
148 /* get master conntrack via master expectation */
149 #define master_ct(conntr) (conntr->master)
151 extern struct net init_net
;
153 static inline struct net
*nf_ct_net(const struct nf_conn
*ct
)
155 return read_pnet(&ct
->ct_net
);
158 /* Alter reply tuple (maybe alter helper). */
160 nf_conntrack_alter_reply(struct nf_conn
*ct
,
161 const struct nf_conntrack_tuple
*newreply
);
163 /* Is this tuple taken? (ignoring any belonging to the given
166 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple
*tuple
,
167 const struct nf_conn
*ignored_conntrack
);
169 /* Return conntrack_info and tuple hash for given skb. */
170 static inline struct nf_conn
*
171 nf_ct_get(const struct sk_buff
*skb
, enum ip_conntrack_info
*ctinfo
)
173 *ctinfo
= skb
->nfctinfo
;
174 return (struct nf_conn
*)skb
->nfct
;
177 /* decrement reference count on a conntrack */
178 static inline void nf_ct_put(struct nf_conn
*ct
)
181 nf_conntrack_put(&ct
->ct_general
);
184 /* Protocol module loading */
185 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto
);
186 extern void nf_ct_l3proto_module_put(unsigned short l3proto
);
189 * Allocate a hashtable of hlist_head (if nulls == 0),
190 * or hlist_nulls_head (if nulls == 1)
192 extern void *nf_ct_alloc_hashtable(unsigned int *sizep
, int *vmalloced
, int nulls
);
194 extern void nf_ct_free_hashtable(void *hash
, int vmalloced
, unsigned int size
);
196 extern struct nf_conntrack_tuple_hash
*
197 __nf_conntrack_find(struct net
*net
, u16 zone
,
198 const struct nf_conntrack_tuple
*tuple
);
200 extern void nf_conntrack_hash_insert(struct nf_conn
*ct
);
201 extern void nf_ct_delete_from_lists(struct nf_conn
*ct
);
202 extern void nf_ct_insert_dying_list(struct nf_conn
*ct
);
204 extern void nf_conntrack_flush_report(struct net
*net
, u32 pid
, int report
);
206 extern bool nf_ct_get_tuplepr(const struct sk_buff
*skb
,
207 unsigned int nhoff
, u_int16_t l3num
,
208 struct nf_conntrack_tuple
*tuple
);
209 extern bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple
*inverse
,
210 const struct nf_conntrack_tuple
*orig
);
212 extern void __nf_ct_refresh_acct(struct nf_conn
*ct
,
213 enum ip_conntrack_info ctinfo
,
214 const struct sk_buff
*skb
,
215 unsigned long extra_jiffies
,
218 /* Refresh conntrack for this many jiffies and do accounting */
219 static inline void nf_ct_refresh_acct(struct nf_conn
*ct
,
220 enum ip_conntrack_info ctinfo
,
221 const struct sk_buff
*skb
,
222 unsigned long extra_jiffies
)
224 __nf_ct_refresh_acct(ct
, ctinfo
, skb
, extra_jiffies
, 1);
227 /* Refresh conntrack for this many jiffies */
228 static inline void nf_ct_refresh(struct nf_conn
*ct
,
229 const struct sk_buff
*skb
,
230 unsigned long extra_jiffies
)
232 __nf_ct_refresh_acct(ct
, 0, skb
, extra_jiffies
, 0);
235 extern bool __nf_ct_kill_acct(struct nf_conn
*ct
,
236 enum ip_conntrack_info ctinfo
,
237 const struct sk_buff
*skb
,
240 /* kill conntrack and do accounting */
241 static inline bool nf_ct_kill_acct(struct nf_conn
*ct
,
242 enum ip_conntrack_info ctinfo
,
243 const struct sk_buff
*skb
)
245 return __nf_ct_kill_acct(ct
, ctinfo
, skb
, 1);
248 /* kill conntrack without accounting */
249 static inline bool nf_ct_kill(struct nf_conn
*ct
)
251 return __nf_ct_kill_acct(ct
, 0, NULL
, 0);
254 /* These are for NAT. Icky. */
255 extern s16 (*nf_ct_nat_offset
)(const struct nf_conn
*ct
,
256 enum ip_conntrack_dir dir
,
259 /* Fake conntrack entry for untracked connections */
260 DECLARE_PER_CPU(struct nf_conn
, nf_conntrack_untracked
);
261 static inline struct nf_conn
*nf_ct_untracked_get(void)
263 return &__raw_get_cpu_var(nf_conntrack_untracked
);
265 extern void nf_ct_untracked_status_or(unsigned long bits
);
267 /* Iterate over all conntracks: if iter returns true, it's deleted. */
269 nf_ct_iterate_cleanup(struct net
*net
, int (*iter
)(struct nf_conn
*i
, void *data
), void *data
);
270 extern void nf_conntrack_free(struct nf_conn
*ct
);
271 extern struct nf_conn
*
272 nf_conntrack_alloc(struct net
*net
, u16 zone
,
273 const struct nf_conntrack_tuple
*orig
,
274 const struct nf_conntrack_tuple
*repl
,
277 static inline int nf_ct_is_template(const struct nf_conn
*ct
)
279 return test_bit(IPS_TEMPLATE_BIT
, &ct
->status
);
282 /* It's confirmed if it is, or has been in the hash table. */
283 static inline int nf_ct_is_confirmed(struct nf_conn
*ct
)
285 return test_bit(IPS_CONFIRMED_BIT
, &ct
->status
);
288 static inline int nf_ct_is_dying(struct nf_conn
*ct
)
290 return test_bit(IPS_DYING_BIT
, &ct
->status
);
293 static inline int nf_ct_is_untracked(const struct nf_conn
*ct
)
295 return test_bit(IPS_UNTRACKED_BIT
, &ct
->status
);
298 extern int nf_conntrack_set_hashsize(const char *val
, struct kernel_param
*kp
);
299 extern unsigned int nf_conntrack_htable_size
;
300 extern unsigned int nf_conntrack_max
;
302 #define NF_CT_STAT_INC(net, count) \
303 __this_cpu_inc((net)->ct.stat->count)
304 #define NF_CT_STAT_INC_ATOMIC(net, count) \
306 local_bh_disable(); \
307 __this_cpu_inc((net)->ct.stat->count); \
311 #define MODULE_ALIAS_NFCT_HELPER(helper) \
312 MODULE_ALIAS("nfct-helper-" helper)
314 #endif /* __KERNEL__ */
315 #endif /* _NF_CONNTRACK_H */