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];
92 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
93 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
97 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
98 plus 1 for any connection(s) we are `master' for */
99 struct nf_conntrack ct_general;
101 /* XXX should I move this to the tail ? - Y.K */
102 /* These are my tuples; original and reply */
103 struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
105 /* Have we seen traffic both ways yet? (bitset) */
106 unsigned long status;
108 /* If we were expected by an expectation, this will be it */
109 struct nf_conn *master;
111 /* Timer function; drops refcnt when it goes off. */
112 struct timer_list timeout;
114 #ifdef CONFIG_NF_CT_ACCT
115 /* Accounting Information (same cache line as other written members) */
116 struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
119 #if defined(CONFIG_NF_CONNTRACK_MARK)
123 #ifdef CONFIG_NF_CONNTRACK_SECMARK
127 /* Storage reserved for other modules: */
128 union nf_conntrack_proto proto;
131 struct nf_ct_ext *ext;
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 static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
145 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
148 static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
150 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
153 /* get master conntrack via master expectation */
154 #define master_ct(conntr) (conntr->master)
156 /* Alter reply tuple (maybe alter helper). */
158 nf_conntrack_alter_reply(struct nf_conn *ct,
159 const struct nf_conntrack_tuple *newreply);
161 /* Is this tuple taken? (ignoring any belonging to the given
164 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
165 const struct nf_conn *ignored_conntrack);
167 /* Return conntrack_info and tuple hash for given skb. */
168 static inline struct nf_conn *
169 nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
171 *ctinfo = skb->nfctinfo;
172 return (struct nf_conn *)skb->nfct;
175 /* decrement reference count on a conntrack */
176 static inline void nf_ct_put(struct nf_conn *ct)
179 nf_conntrack_put(&ct->ct_general);
182 /* Protocol module loading */
183 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
184 extern void nf_ct_l3proto_module_put(unsigned short l3proto);
186 extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced);
187 extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced,
190 extern struct nf_conntrack_tuple_hash *
191 __nf_conntrack_find(const struct nf_conntrack_tuple *tuple);
193 extern void nf_conntrack_hash_insert(struct nf_conn *ct);
195 extern void nf_conntrack_flush(void);
197 extern int nf_ct_get_tuplepr(const struct sk_buff *skb,
200 struct nf_conntrack_tuple *tuple);
201 extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
202 const struct nf_conntrack_tuple *orig);
204 extern 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,
210 /* Refresh conntrack for this many jiffies and do accounting */
211 static inline void nf_ct_refresh_acct(struct nf_conn *ct,
212 enum ip_conntrack_info ctinfo,
213 const struct sk_buff *skb,
214 unsigned long extra_jiffies)
216 __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
219 /* Refresh conntrack for this many jiffies */
220 static inline void nf_ct_refresh(struct nf_conn *ct,
221 const struct sk_buff *skb,
222 unsigned long extra_jiffies)
224 __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
227 /* These are for NAT. Icky. */
228 /* Update TCP window tracking data when NAT mangles the packet */
229 extern void nf_conntrack_tcp_update(const struct sk_buff *skb,
230 unsigned int dataoff,
234 /* Fake conntrack entry for untracked connections */
235 extern struct nf_conn nf_conntrack_untracked;
237 /* Iterate over all conntracks: if iter returns true, it's deleted. */
239 nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data);
240 extern void nf_conntrack_free(struct nf_conn *ct);
241 extern struct nf_conn *
242 nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
243 const struct nf_conntrack_tuple *repl);
245 /* It's confirmed if it is, or has been in the hash table. */
246 static inline int nf_ct_is_confirmed(struct nf_conn *ct)
248 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
251 static inline int nf_ct_is_dying(struct nf_conn *ct)
253 return test_bit(IPS_DYING_BIT, &ct->status);
256 static inline int nf_ct_is_untracked(const struct sk_buff *skb)
258 return (skb->nfct == &nf_conntrack_untracked.ct_general);
261 extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
262 extern unsigned int nf_conntrack_htable_size;
263 extern int nf_conntrack_checksum;
264 extern atomic_t nf_conntrack_count;
265 extern int nf_conntrack_max;
267 DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
268 #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
269 #define NF_CT_STAT_INC_ATOMIC(count) \
271 local_bh_disable(); \
272 __get_cpu_var(nf_conntrack_stat).count++; \
276 #endif /* __KERNEL__ */
277 #endif /* _NF_CONNTRACK_H */