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) \
71 /* Wooah! I'm tripping my conntrack in a frenzy of \
73 printk("NF_CT_ASSERT: %s:%i(%s)\n", \
74 __FILE__, __LINE__, __FUNCTION__); \
77 #define NF_CT_ASSERT(x)
80 struct nf_conntrack_helper;
82 /* Must be kept in sync with the classes defined by helpers */
83 #define NF_CT_MAX_EXPECT_CLASSES 3
85 /* nf_conn feature for connections that have a helper */
88 struct nf_conntrack_helper *helper;
90 union nf_conntrack_help help;
92 struct hlist_head expectations;
94 /* Current number of expected connections */
95 u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
99 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
100 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
104 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
105 plus 1 for any connection(s) we are `master' for */
106 struct nf_conntrack ct_general;
108 /* XXX should I move this to the tail ? - Y.K */
109 /* These are my tuples; original and reply */
110 struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
112 /* Have we seen traffic both ways yet? (bitset) */
113 unsigned long status;
115 /* If we were expected by an expectation, this will be it */
116 struct nf_conn *master;
118 /* Timer function; drops refcnt when it goes off. */
119 struct timer_list timeout;
121 #ifdef CONFIG_NF_CT_ACCT
122 /* Accounting Information (same cache line as other written members) */
123 struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
126 #if defined(CONFIG_NF_CONNTRACK_MARK)
130 #ifdef CONFIG_NF_CONNTRACK_SECMARK
134 /* Storage reserved for other modules: */
135 union nf_conntrack_proto proto;
138 struct nf_ct_ext *ext;
143 static inline struct nf_conn *
144 nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
146 return container_of(hash, struct nf_conn,
147 tuplehash[hash->tuple.dst.dir]);
150 /* get master conntrack via master expectation */
151 #define master_ct(conntr) (conntr->master)
153 /* Alter reply tuple (maybe alter helper). */
155 nf_conntrack_alter_reply(struct nf_conn *ct,
156 const struct nf_conntrack_tuple *newreply);
158 /* Is this tuple taken? (ignoring any belonging to the given
161 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
162 const struct nf_conn *ignored_conntrack);
164 /* Return conntrack_info and tuple hash for given skb. */
165 static inline struct nf_conn *
166 nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
168 *ctinfo = skb->nfctinfo;
169 return (struct nf_conn *)skb->nfct;
172 /* decrement reference count on a conntrack */
173 static inline void nf_ct_put(struct nf_conn *ct)
176 nf_conntrack_put(&ct->ct_general);
179 /* Protocol module loading */
180 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
181 extern void nf_ct_l3proto_module_put(unsigned short l3proto);
183 extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced);
184 extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced,
187 extern struct nf_conntrack_tuple_hash *
188 __nf_conntrack_find(const struct nf_conntrack_tuple *tuple);
190 extern void nf_conntrack_hash_insert(struct nf_conn *ct);
192 extern void nf_conntrack_flush(void);
194 extern int nf_ct_get_tuplepr(const struct sk_buff *skb,
197 struct nf_conntrack_tuple *tuple);
198 extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
199 const struct nf_conntrack_tuple *orig);
201 extern 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,
207 /* Refresh conntrack for this many jiffies and do accounting */
208 static inline void nf_ct_refresh_acct(struct nf_conn *ct,
209 enum ip_conntrack_info ctinfo,
210 const struct sk_buff *skb,
211 unsigned long extra_jiffies)
213 __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
216 /* Refresh conntrack for this many jiffies */
217 static inline void nf_ct_refresh(struct nf_conn *ct,
218 const struct sk_buff *skb,
219 unsigned long extra_jiffies)
221 __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
224 /* These are for NAT. Icky. */
225 /* Update TCP window tracking data when NAT mangles the packet */
226 extern void nf_conntrack_tcp_update(const struct sk_buff *skb,
227 unsigned int dataoff,
231 /* Fake conntrack entry for untracked connections */
232 extern struct nf_conn nf_conntrack_untracked;
234 /* Iterate over all conntracks: if iter returns true, it's deleted. */
236 nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data);
237 extern void nf_conntrack_free(struct nf_conn *ct);
238 extern struct nf_conn *
239 nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
240 const struct nf_conntrack_tuple *repl);
242 /* It's confirmed if it is, or has been in the hash table. */
243 static inline int nf_ct_is_confirmed(struct nf_conn *ct)
245 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
248 static inline int nf_ct_is_dying(struct nf_conn *ct)
250 return test_bit(IPS_DYING_BIT, &ct->status);
253 static inline int nf_ct_is_untracked(const struct sk_buff *skb)
255 return (skb->nfct == &nf_conntrack_untracked.ct_general);
258 extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
259 extern unsigned int nf_conntrack_htable_size;
260 extern int nf_conntrack_checksum;
261 extern atomic_t nf_conntrack_count;
262 extern int nf_conntrack_max;
264 DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
265 #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
266 #define NF_CT_STAT_INC_ATOMIC(count) \
268 local_bh_disable(); \
269 __get_cpu_var(nf_conntrack_stat).count++; \
273 #endif /* __KERNEL__ */
274 #endif /* _NF_CONNTRACK_H */