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 3
75 /* nf_conn feature for connections that have a helper */
78 struct nf_conntrack_helper *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;
96 /* XXX should I move this to the tail ? - Y.K */
97 /* These are my tuples; original and reply */
98 struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
100 /* Have we seen traffic both ways yet? (bitset) */
101 unsigned long status;
103 /* If we were expected by an expectation, this will be it */
104 struct nf_conn *master;
106 /* Timer function; drops refcnt when it goes off. */
107 struct timer_list timeout;
109 #if defined(CONFIG_NF_CONNTRACK_MARK)
113 #ifdef CONFIG_NF_CONNTRACK_SECMARK
117 /* Storage reserved for other modules: */
118 union nf_conntrack_proto proto;
121 struct nf_ct_ext *ext;
127 static inline struct nf_conn *
128 nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
130 return container_of(hash, struct nf_conn,
131 tuplehash[hash->tuple.dst.dir]);
134 static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
136 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
139 static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
141 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
144 #define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
146 /* get master conntrack via master expectation */
147 #define master_ct(conntr) (conntr->master)
149 extern struct net init_net;
151 static inline struct net *nf_ct_net(const struct nf_conn *ct)
160 /* Alter reply tuple (maybe alter helper). */
162 nf_conntrack_alter_reply(struct nf_conn *ct,
163 const struct nf_conntrack_tuple *newreply);
165 /* Is this tuple taken? (ignoring any belonging to the given
168 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
169 const struct nf_conn *ignored_conntrack);
171 /* Return conntrack_info and tuple hash for given skb. */
172 static inline struct nf_conn *
173 nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
175 *ctinfo = skb->nfctinfo;
176 return (struct nf_conn *)skb->nfct;
179 /* decrement reference count on a conntrack */
180 static inline void nf_ct_put(struct nf_conn *ct)
183 nf_conntrack_put(&ct->ct_general);
186 /* Protocol module loading */
187 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
188 extern void nf_ct_l3proto_module_put(unsigned short l3proto);
191 * Allocate a hashtable of hlist_head (if nulls == 0),
192 * or hlist_nulls_head (if nulls == 1)
194 extern void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls);
196 extern void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size);
198 extern struct nf_conntrack_tuple_hash *
199 __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple);
201 extern void nf_conntrack_hash_insert(struct nf_conn *ct);
203 extern void nf_conntrack_flush_report(struct net *net, u32 pid, int report);
205 extern bool nf_ct_get_tuplepr(const struct sk_buff *skb,
206 unsigned int nhoff, u_int16_t l3num,
207 struct nf_conntrack_tuple *tuple);
208 extern bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
209 const struct nf_conntrack_tuple *orig);
211 extern 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,
217 /* Refresh conntrack for this many jiffies and do accounting */
218 static inline void nf_ct_refresh_acct(struct nf_conn *ct,
219 enum ip_conntrack_info ctinfo,
220 const struct sk_buff *skb,
221 unsigned long extra_jiffies)
223 __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
226 /* Refresh conntrack for this many jiffies */
227 static inline void nf_ct_refresh(struct nf_conn *ct,
228 const struct sk_buff *skb,
229 unsigned long extra_jiffies)
231 __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
234 extern bool __nf_ct_kill_acct(struct nf_conn *ct,
235 enum ip_conntrack_info ctinfo,
236 const struct sk_buff *skb,
239 /* kill conntrack and do accounting */
240 static inline bool nf_ct_kill_acct(struct nf_conn *ct,
241 enum ip_conntrack_info ctinfo,
242 const struct sk_buff *skb)
244 return __nf_ct_kill_acct(ct, ctinfo, skb, 1);
247 /* kill conntrack without accounting */
248 static inline bool nf_ct_kill(struct nf_conn *ct)
250 return __nf_ct_kill_acct(ct, 0, NULL, 0);
253 /* These are for NAT. Icky. */
254 /* Update TCP window tracking data when NAT mangles the packet */
255 extern void nf_conntrack_tcp_update(const struct sk_buff *skb,
256 unsigned int dataoff,
260 /* Fake conntrack entry for untracked connections */
261 extern struct nf_conn nf_conntrack_untracked;
263 /* Iterate over all conntracks: if iter returns true, it's deleted. */
265 nf_ct_iterate_cleanup(struct net *net, int (*iter)(struct nf_conn *i, void *data), void *data);
266 extern void nf_conntrack_free(struct nf_conn *ct);
267 extern struct nf_conn *
268 nf_conntrack_alloc(struct net *net,
269 const struct nf_conntrack_tuple *orig,
270 const struct nf_conntrack_tuple *repl,
273 /* It's confirmed if it is, or has been in the hash table. */
274 static inline int nf_ct_is_confirmed(struct nf_conn *ct)
276 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
279 static inline int nf_ct_is_dying(struct nf_conn *ct)
281 return test_bit(IPS_DYING_BIT, &ct->status);
284 static inline int nf_ct_is_untracked(const struct sk_buff *skb)
286 return (skb->nfct == &nf_conntrack_untracked.ct_general);
289 extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
290 extern unsigned int nf_conntrack_htable_size;
291 extern unsigned int nf_conntrack_max;
293 #define NF_CT_STAT_INC(net, count) \
294 (per_cpu_ptr((net)->ct.stat, raw_smp_processor_id())->count++)
295 #define NF_CT_STAT_INC_ATOMIC(net, count) \
297 local_bh_disable(); \
298 per_cpu_ptr((net)->ct.stat, raw_smp_processor_id())->count++; \
302 #define MODULE_ALIAS_NFCT_HELPER(helper) \
303 MODULE_ALIAS("nfct-helper-" helper)
305 #endif /* __KERNEL__ */
306 #endif /* _NF_CONNTRACK_H */