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>
48 #include <linux/netfilter/nf_conntrack_sane.h>
49 #include <linux/netfilter/nf_conntrack_sip.h>
51 /* per conntrack: application helper private data */
52 union nf_conntrack_help {
53 /* insert conntrack helper private data (master) here */
54 struct nf_ct_ftp_master ct_ftp_info;
55 struct nf_ct_pptp_master ct_pptp_info;
56 struct nf_ct_h323_master ct_h323_info;
57 struct nf_ct_sane_master ct_sane_info;
58 struct nf_ct_sip_master ct_sip_info;
61 #include <linux/types.h>
62 #include <linux/skbuff.h>
63 #include <linux/timer.h>
65 #ifdef CONFIG_NETFILTER_DEBUG
66 #define NF_CT_ASSERT(x) \
69 /* Wooah! I'm tripping my conntrack in a frenzy of \
71 printk("NF_CT_ASSERT: %s:%i(%s)\n", \
72 __FILE__, __LINE__, __FUNCTION__); \
75 #define NF_CT_ASSERT(x)
78 struct nf_conntrack_helper;
80 /* Must be kept in sync with the classes defined by helpers */
81 #define NF_CT_MAX_EXPECT_CLASSES 3
83 /* nf_conn feature for connections that have a helper */
86 struct nf_conntrack_helper *helper;
88 union nf_conntrack_help help;
90 struct hlist_head expectations;
92 /* Current number of expected connections */
93 u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
97 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
98 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
102 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
103 plus 1 for any connection(s) we are `master' for */
104 struct nf_conntrack ct_general;
106 /* XXX should I move this to the tail ? - Y.K */
107 /* These are my tuples; original and reply */
108 struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
110 /* Have we seen traffic both ways yet? (bitset) */
111 unsigned long status;
113 /* If we were expected by an expectation, this will be it */
114 struct nf_conn *master;
116 /* Timer function; drops refcnt when it goes off. */
117 struct timer_list timeout;
119 #ifdef CONFIG_NF_CT_ACCT
120 /* Accounting Information (same cache line as other written members) */
121 struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
124 #if defined(CONFIG_NF_CONNTRACK_MARK)
128 #ifdef CONFIG_NF_CONNTRACK_SECMARK
132 /* Storage reserved for other modules: */
133 union nf_conntrack_proto proto;
136 struct nf_ct_ext *ext;
141 static inline struct nf_conn *
142 nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
144 return container_of(hash, struct nf_conn,
145 tuplehash[hash->tuple.dst.dir]);
148 /* get master conntrack via master expectation */
149 #define master_ct(conntr) (conntr->master)
151 /* Alter reply tuple (maybe alter helper). */
153 nf_conntrack_alter_reply(struct nf_conn *ct,
154 const struct nf_conntrack_tuple *newreply);
156 /* Is this tuple taken? (ignoring any belonging to the given
159 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
160 const struct nf_conn *ignored_conntrack);
162 /* Return conntrack_info and tuple hash for given skb. */
163 static inline struct nf_conn *
164 nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
166 *ctinfo = skb->nfctinfo;
167 return (struct nf_conn *)skb->nfct;
170 /* decrement reference count on a conntrack */
171 static inline void nf_ct_put(struct nf_conn *ct)
174 nf_conntrack_put(&ct->ct_general);
177 /* Protocol module loading */
178 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
179 extern void nf_ct_l3proto_module_put(unsigned short l3proto);
181 extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced);
182 extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced,
185 extern struct nf_conntrack_tuple_hash *
186 __nf_conntrack_find(const struct nf_conntrack_tuple *tuple);
188 extern void nf_conntrack_hash_insert(struct nf_conn *ct);
190 extern void nf_conntrack_flush(void);
192 extern int nf_ct_get_tuplepr(const struct sk_buff *skb,
195 struct nf_conntrack_tuple *tuple);
196 extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
197 const struct nf_conntrack_tuple *orig);
199 extern void __nf_ct_refresh_acct(struct nf_conn *ct,
200 enum ip_conntrack_info ctinfo,
201 const struct sk_buff *skb,
202 unsigned long extra_jiffies,
205 /* Refresh conntrack for this many jiffies and do accounting */
206 static inline void nf_ct_refresh_acct(struct nf_conn *ct,
207 enum ip_conntrack_info ctinfo,
208 const struct sk_buff *skb,
209 unsigned long extra_jiffies)
211 __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
214 /* Refresh conntrack for this many jiffies */
215 static inline void nf_ct_refresh(struct nf_conn *ct,
216 const struct sk_buff *skb,
217 unsigned long extra_jiffies)
219 __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
222 /* These are for NAT. Icky. */
223 /* Update TCP window tracking data when NAT mangles the packet */
224 extern void nf_conntrack_tcp_update(const struct sk_buff *skb,
225 unsigned int dataoff,
229 /* Fake conntrack entry for untracked connections */
230 extern struct nf_conn nf_conntrack_untracked;
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 static inline int nf_ct_is_untracked(const struct sk_buff *skb)
253 return (skb->nfct == &nf_conntrack_untracked.ct_general);
256 extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
257 extern unsigned int nf_conntrack_htable_size;
258 extern int nf_conntrack_checksum;
259 extern atomic_t nf_conntrack_count;
260 extern int nf_conntrack_max;
262 DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
263 #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
264 #define NF_CT_STAT_INC_ATOMIC(count) \
266 local_bh_disable(); \
267 __get_cpu_var(nf_conntrack_stat).count++; \
271 #endif /* __KERNEL__ */
272 #endif /* _NF_CONNTRACK_H */