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Commit | Line | Data |
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9fb9cbb1 YK |
1 | /* |
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 | |
4 | * extension. | |
5 | * | |
6 | * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> | |
7 | * - generalize L3 protocol dependent part. | |
8 | * | |
9 | * Derived from include/linux/netfiter_ipv4/ip_conntrack.h | |
10 | */ | |
11 | ||
12 | #ifndef _NF_CONNTRACK_H | |
13 | #define _NF_CONNTRACK_H | |
14 | ||
15 | #include <linux/netfilter/nf_conntrack_common.h> | |
16 | ||
17 | #ifdef __KERNEL__ | |
9fb9cbb1 YK |
18 | #include <linux/bitops.h> |
19 | #include <linux/compiler.h> | |
20 | #include <asm/atomic.h> | |
21 | ||
22 | #include <linux/netfilter/nf_conntrack_tcp.h> | |
23 | #include <linux/netfilter/nf_conntrack_sctp.h> | |
f09943fe | 24 | #include <linux/netfilter/nf_conntrack_proto_gre.h> |
9fb9cbb1 YK |
25 | #include <net/netfilter/ipv4/nf_conntrack_icmp.h> |
26 | #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> | |
27 | ||
28 | #include <net/netfilter/nf_conntrack_tuple.h> | |
29 | ||
30 | /* per conntrack: protocol private data */ | |
31 | union nf_conntrack_proto { | |
32 | /* insert conntrack proto private data here */ | |
33 | struct ip_ct_sctp sctp; | |
34 | struct ip_ct_tcp tcp; | |
35 | struct ip_ct_icmp icmp; | |
36 | struct nf_ct_icmpv6 icmpv6; | |
f09943fe | 37 | struct nf_ct_gre gre; |
9fb9cbb1 YK |
38 | }; |
39 | ||
40 | union nf_conntrack_expect_proto { | |
41 | /* insert expect proto private data here */ | |
42 | }; | |
43 | ||
44 | /* Add protocol helper include file here */ | |
45 | #include <linux/netfilter/nf_conntrack_ftp.h> | |
f09943fe | 46 | #include <linux/netfilter/nf_conntrack_pptp.h> |
f587de0e | 47 | #include <linux/netfilter/nf_conntrack_h323.h> |
6fecd198 | 48 | #include <linux/netfilter/nf_conntrack_sane.h> |
9fb9cbb1 YK |
49 | |
50 | /* per conntrack: application helper private data */ | |
51 | union nf_conntrack_help { | |
52 | /* insert conntrack helper private data (master) here */ | |
55a73324 | 53 | struct nf_ct_ftp_master ct_ftp_info; |
f09943fe | 54 | struct nf_ct_pptp_master ct_pptp_info; |
f587de0e | 55 | struct nf_ct_h323_master ct_h323_info; |
6fecd198 | 56 | struct nf_ct_sane_master ct_sane_info; |
9fb9cbb1 YK |
57 | }; |
58 | ||
59 | #include <linux/types.h> | |
60 | #include <linux/skbuff.h> | |
d7fe0f24 | 61 | #include <linux/timer.h> |
9fb9cbb1 YK |
62 | |
63 | #ifdef CONFIG_NETFILTER_DEBUG | |
64 | #define NF_CT_ASSERT(x) \ | |
65 | do { \ | |
66 | if (!(x)) \ | |
67 | /* Wooah! I'm tripping my conntrack in a frenzy of \ | |
68 | netplay... */ \ | |
69 | printk("NF_CT_ASSERT: %s:%i(%s)\n", \ | |
70 | __FILE__, __LINE__, __FUNCTION__); \ | |
71 | } while(0) | |
72 | #else | |
73 | #define NF_CT_ASSERT(x) | |
74 | #endif | |
75 | ||
76 | struct nf_conntrack_helper; | |
77 | ||
dc808fe2 HW |
78 | /* nf_conn feature for connections that have a helper */ |
79 | struct nf_conn_help { | |
80 | /* Helper. if any */ | |
81 | struct nf_conntrack_helper *helper; | |
82 | ||
83 | union nf_conntrack_help help; | |
84 | ||
b560580a PM |
85 | struct hlist_head expectations; |
86 | ||
dc808fe2 HW |
87 | /* Current number of expected connections */ |
88 | unsigned int expecting; | |
89 | }; | |
90 | ||
91 | ||
9fb9cbb1 | 92 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
f8eb24a8 PM |
93 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
94 | ||
9fb9cbb1 YK |
95 | struct nf_conn |
96 | { | |
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; | |
100 | ||
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]; | |
104 | ||
105 | /* Have we seen traffic both ways yet? (bitset) */ | |
106 | unsigned long status; | |
107 | ||
dc808fe2 HW |
108 | /* If we were expected by an expectation, this will be it */ |
109 | struct nf_conn *master; | |
110 | ||
9fb9cbb1 YK |
111 | /* Timer function; drops refcnt when it goes off. */ |
112 | struct timer_list timeout; | |
113 | ||
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]; | |
117 | #endif | |
9fb9cbb1 | 118 | |
9fb9cbb1 YK |
119 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
120 | u_int32_t mark; | |
121 | #endif | |
122 | ||
7c9728c3 JM |
123 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
124 | u_int32_t secmark; | |
125 | #endif | |
126 | ||
dc808fe2 HW |
127 | /* Storage reserved for other modules: */ |
128 | union nf_conntrack_proto proto; | |
9fb9cbb1 | 129 | |
ecfab2c9 YK |
130 | /* Extensions */ |
131 | struct nf_ct_ext *ext; | |
9fb9cbb1 YK |
132 | }; |
133 | ||
9fb9cbb1 YK |
134 | static inline struct nf_conn * |
135 | nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) | |
136 | { | |
137 | return container_of(hash, struct nf_conn, | |
138 | tuplehash[hash->tuple.dst.dir]); | |
139 | } | |
140 | ||
141 | /* get master conntrack via master expectation */ | |
142 | #define master_ct(conntr) (conntr->master) | |
143 | ||
144 | /* Alter reply tuple (maybe alter helper). */ | |
145 | extern void | |
146 | nf_conntrack_alter_reply(struct nf_conn *conntrack, | |
147 | const struct nf_conntrack_tuple *newreply); | |
148 | ||
149 | /* Is this tuple taken? (ignoring any belonging to the given | |
150 | conntrack). */ | |
151 | extern int | |
152 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
153 | const struct nf_conn *ignored_conntrack); | |
154 | ||
155 | /* Return conntrack_info and tuple hash for given skb. */ | |
156 | static inline struct nf_conn * | |
157 | nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) | |
158 | { | |
159 | *ctinfo = skb->nfctinfo; | |
160 | return (struct nf_conn *)skb->nfct; | |
161 | } | |
162 | ||
163 | /* decrement reference count on a conntrack */ | |
164 | static inline void nf_ct_put(struct nf_conn *ct) | |
165 | { | |
166 | NF_CT_ASSERT(ct); | |
167 | nf_conntrack_put(&ct->ct_general); | |
168 | } | |
169 | ||
b9f78f9f PNA |
170 | /* Protocol module loading */ |
171 | extern int nf_ct_l3proto_try_module_get(unsigned short l3proto); | |
172 | extern void nf_ct_l3proto_module_put(unsigned short l3proto); | |
173 | ||
ac565e5f PM |
174 | extern struct hlist_head *nf_ct_alloc_hashtable(int *sizep, int *vmalloced); |
175 | extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, | |
176 | int size); | |
177 | ||
c1d10adb PNA |
178 | extern struct nf_conntrack_tuple_hash * |
179 | __nf_conntrack_find(const struct nf_conntrack_tuple *tuple, | |
180 | const struct nf_conn *ignored_conntrack); | |
181 | ||
182 | extern void nf_conntrack_hash_insert(struct nf_conn *ct); | |
183 | ||
c1d10adb PNA |
184 | extern void nf_conntrack_flush(void); |
185 | ||
e2a3123f YK |
186 | extern int nf_ct_get_tuplepr(const struct sk_buff *skb, |
187 | unsigned int nhoff, | |
188 | u_int16_t l3num, | |
189 | struct nf_conntrack_tuple *tuple); | |
9fb9cbb1 YK |
190 | extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
191 | const struct nf_conntrack_tuple *orig); | |
192 | ||
193 | extern void __nf_ct_refresh_acct(struct nf_conn *ct, | |
194 | enum ip_conntrack_info ctinfo, | |
195 | const struct sk_buff *skb, | |
196 | unsigned long extra_jiffies, | |
197 | int do_acct); | |
198 | ||
199 | /* Refresh conntrack for this many jiffies and do accounting */ | |
200 | static inline void nf_ct_refresh_acct(struct nf_conn *ct, | |
201 | enum ip_conntrack_info ctinfo, | |
202 | const struct sk_buff *skb, | |
203 | unsigned long extra_jiffies) | |
204 | { | |
205 | __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); | |
206 | } | |
207 | ||
208 | /* Refresh conntrack for this many jiffies */ | |
209 | static inline void nf_ct_refresh(struct nf_conn *ct, | |
210 | const struct sk_buff *skb, | |
211 | unsigned long extra_jiffies) | |
212 | { | |
213 | __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); | |
214 | } | |
215 | ||
216 | /* These are for NAT. Icky. */ | |
217 | /* Update TCP window tracking data when NAT mangles the packet */ | |
218 | extern void nf_conntrack_tcp_update(struct sk_buff *skb, | |
219 | unsigned int dataoff, | |
220 | struct nf_conn *conntrack, | |
221 | int dir); | |
222 | ||
9fb9cbb1 YK |
223 | /* Fake conntrack entry for untracked connections */ |
224 | extern struct nf_conn nf_conntrack_untracked; | |
225 | ||
226 | extern int nf_ct_no_defrag; | |
227 | ||
228 | /* Iterate over all conntracks: if iter returns true, it's deleted. */ | |
229 | extern void | |
230 | nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data); | |
231 | extern void nf_conntrack_free(struct nf_conn *ct); | |
232 | extern struct nf_conn * | |
233 | nf_conntrack_alloc(const struct nf_conntrack_tuple *orig, | |
234 | const struct nf_conntrack_tuple *repl); | |
235 | ||
236 | /* It's confirmed if it is, or has been in the hash table. */ | |
237 | static inline int nf_ct_is_confirmed(struct nf_conn *ct) | |
238 | { | |
239 | return test_bit(IPS_CONFIRMED_BIT, &ct->status); | |
240 | } | |
241 | ||
242 | static inline int nf_ct_is_dying(struct nf_conn *ct) | |
243 | { | |
244 | return test_bit(IPS_DYING_BIT, &ct->status); | |
245 | } | |
246 | ||
587aa641 PM |
247 | static inline int nf_ct_is_untracked(const struct sk_buff *skb) |
248 | { | |
249 | return (skb->nfct == &nf_conntrack_untracked.ct_general); | |
250 | } | |
251 | ||
9fb9cbb1 | 252 | extern unsigned int nf_conntrack_htable_size; |
39a27a35 | 253 | extern int nf_conntrack_checksum; |
f8eb24a8 PM |
254 | extern atomic_t nf_conntrack_count; |
255 | extern int nf_conntrack_max; | |
9fb9cbb1 | 256 | |
f8eb24a8 | 257 | DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); |
9fb9cbb1 | 258 | #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) |
c0e912d7 PM |
259 | #define NF_CT_STAT_INC_ATOMIC(count) \ |
260 | do { \ | |
261 | local_bh_disable(); \ | |
262 | __get_cpu_var(nf_conntrack_stat).count++; \ | |
263 | local_bh_enable(); \ | |
264 | } while (0) | |
9fb9cbb1 | 265 | |
9fb9cbb1 | 266 | extern int |
dc808fe2 | 267 | nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size); |
9fb9cbb1 YK |
268 | extern void |
269 | nf_conntrack_unregister_cache(u_int32_t features); | |
270 | ||
271 | #endif /* __KERNEL__ */ | |
272 | #endif /* _NF_CONNTRACK_H */ |