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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__ | |
18 | #include <linux/config.h> | |
19 | #include <linux/bitops.h> | |
20 | #include <linux/compiler.h> | |
21 | #include <asm/atomic.h> | |
22 | ||
23 | #include <linux/netfilter/nf_conntrack_tcp.h> | |
24 | #include <linux/netfilter/nf_conntrack_sctp.h> | |
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; | |
37 | }; | |
38 | ||
39 | union nf_conntrack_expect_proto { | |
40 | /* insert expect proto private data here */ | |
41 | }; | |
42 | ||
43 | /* Add protocol helper include file here */ | |
44 | #include <linux/netfilter/nf_conntrack_ftp.h> | |
45 | ||
46 | /* per conntrack: application helper private data */ | |
47 | union nf_conntrack_help { | |
48 | /* insert conntrack helper private data (master) here */ | |
49 | struct ip_ct_ftp_master ct_ftp_info; | |
50 | }; | |
51 | ||
52 | #include <linux/types.h> | |
53 | #include <linux/skbuff.h> | |
54 | ||
55 | #ifdef CONFIG_NETFILTER_DEBUG | |
56 | #define NF_CT_ASSERT(x) \ | |
57 | do { \ | |
58 | if (!(x)) \ | |
59 | /* Wooah! I'm tripping my conntrack in a frenzy of \ | |
60 | netplay... */ \ | |
61 | printk("NF_CT_ASSERT: %s:%i(%s)\n", \ | |
62 | __FILE__, __LINE__, __FUNCTION__); \ | |
63 | } while(0) | |
64 | #else | |
65 | #define NF_CT_ASSERT(x) | |
66 | #endif | |
67 | ||
68 | struct nf_conntrack_helper; | |
69 | ||
70 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> | |
71 | struct nf_conn | |
72 | { | |
73 | /* Usage count in here is 1 for hash table/destruct timer, 1 per skb, | |
74 | plus 1 for any connection(s) we are `master' for */ | |
75 | struct nf_conntrack ct_general; | |
76 | ||
77 | /* XXX should I move this to the tail ? - Y.K */ | |
78 | /* These are my tuples; original and reply */ | |
79 | struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; | |
80 | ||
81 | /* Have we seen traffic both ways yet? (bitset) */ | |
82 | unsigned long status; | |
83 | ||
84 | /* Timer function; drops refcnt when it goes off. */ | |
85 | struct timer_list timeout; | |
86 | ||
87 | #ifdef CONFIG_NF_CT_ACCT | |
88 | /* Accounting Information (same cache line as other written members) */ | |
89 | struct ip_conntrack_counter counters[IP_CT_DIR_MAX]; | |
90 | #endif | |
91 | /* If we were expected by an expectation, this will be it */ | |
92 | struct nf_conn *master; | |
93 | ||
94 | /* Current number of expected connections */ | |
95 | unsigned int expecting; | |
96 | ||
97 | /* Helper. if any */ | |
98 | struct nf_conntrack_helper *helper; | |
99 | ||
100 | /* features - nat, helper, ... used by allocating system */ | |
101 | u_int32_t features; | |
102 | ||
103 | /* Storage reserved for other modules: */ | |
104 | ||
105 | union nf_conntrack_proto proto; | |
106 | ||
107 | #if defined(CONFIG_NF_CONNTRACK_MARK) | |
108 | u_int32_t mark; | |
109 | #endif | |
110 | ||
111 | /* These members are dynamically allocated. */ | |
112 | ||
113 | union nf_conntrack_help *help; | |
114 | ||
115 | /* Layer 3 dependent members. (ex: NAT) */ | |
116 | union { | |
117 | struct nf_conntrack_ipv4 *ipv4; | |
118 | } l3proto; | |
119 | void *data[0]; | |
120 | }; | |
121 | ||
122 | struct nf_conntrack_expect | |
123 | { | |
124 | /* Internal linked list (global expectation list) */ | |
125 | struct list_head list; | |
126 | ||
127 | /* We expect this tuple, with the following mask */ | |
128 | struct nf_conntrack_tuple tuple, mask; | |
129 | ||
130 | /* Function to call after setup and insertion */ | |
131 | void (*expectfn)(struct nf_conn *new, | |
132 | struct nf_conntrack_expect *this); | |
133 | ||
134 | /* The conntrack of the master connection */ | |
135 | struct nf_conn *master; | |
136 | ||
137 | /* Timer function; deletes the expectation. */ | |
138 | struct timer_list timeout; | |
139 | ||
140 | /* Usage count. */ | |
141 | atomic_t use; | |
142 | ||
143 | /* Flags */ | |
144 | unsigned int flags; | |
145 | ||
146 | #ifdef CONFIG_NF_NAT_NEEDED | |
147 | /* This is the original per-proto part, used to map the | |
148 | * expected connection the way the recipient expects. */ | |
149 | union nf_conntrack_manip_proto saved_proto; | |
150 | /* Direction relative to the master connection. */ | |
151 | enum ip_conntrack_dir dir; | |
152 | #endif | |
153 | }; | |
154 | ||
155 | #define NF_CT_EXPECT_PERMANENT 0x1 | |
156 | ||
157 | static inline struct nf_conn * | |
158 | nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) | |
159 | { | |
160 | return container_of(hash, struct nf_conn, | |
161 | tuplehash[hash->tuple.dst.dir]); | |
162 | } | |
163 | ||
164 | /* get master conntrack via master expectation */ | |
165 | #define master_ct(conntr) (conntr->master) | |
166 | ||
167 | /* Alter reply tuple (maybe alter helper). */ | |
168 | extern void | |
169 | nf_conntrack_alter_reply(struct nf_conn *conntrack, | |
170 | const struct nf_conntrack_tuple *newreply); | |
171 | ||
172 | /* Is this tuple taken? (ignoring any belonging to the given | |
173 | conntrack). */ | |
174 | extern int | |
175 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
176 | const struct nf_conn *ignored_conntrack); | |
177 | ||
178 | /* Return conntrack_info and tuple hash for given skb. */ | |
179 | static inline struct nf_conn * | |
180 | nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) | |
181 | { | |
182 | *ctinfo = skb->nfctinfo; | |
183 | return (struct nf_conn *)skb->nfct; | |
184 | } | |
185 | ||
186 | /* decrement reference count on a conntrack */ | |
187 | static inline void nf_ct_put(struct nf_conn *ct) | |
188 | { | |
189 | NF_CT_ASSERT(ct); | |
190 | nf_conntrack_put(&ct->ct_general); | |
191 | } | |
192 | ||
193 | /* call to create an explicit dependency on nf_conntrack. */ | |
194 | extern void need_nf_conntrack(void); | |
195 | ||
196 | extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, | |
197 | const struct nf_conntrack_tuple *orig); | |
198 | ||
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, | |
203 | int do_acct); | |
204 | ||
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) | |
210 | { | |
211 | __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); | |
212 | } | |
213 | ||
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) | |
218 | { | |
219 | __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); | |
220 | } | |
221 | ||
222 | /* These are for NAT. Icky. */ | |
223 | /* Update TCP window tracking data when NAT mangles the packet */ | |
224 | extern void nf_conntrack_tcp_update(struct sk_buff *skb, | |
225 | unsigned int dataoff, | |
226 | struct nf_conn *conntrack, | |
227 | int dir); | |
228 | ||
229 | /* Call me when a conntrack is destroyed. */ | |
230 | extern void (*nf_conntrack_destroyed)(struct nf_conn *conntrack); | |
231 | ||
232 | /* Fake conntrack entry for untracked connections */ | |
233 | extern struct nf_conn nf_conntrack_untracked; | |
234 | ||
235 | extern int nf_ct_no_defrag; | |
236 | ||
237 | /* Iterate over all conntracks: if iter returns true, it's deleted. */ | |
238 | extern void | |
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); | |
244 | ||
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) | |
247 | { | |
248 | return test_bit(IPS_CONFIRMED_BIT, &ct->status); | |
249 | } | |
250 | ||
251 | static inline int nf_ct_is_dying(struct nf_conn *ct) | |
252 | { | |
253 | return test_bit(IPS_DYING_BIT, &ct->status); | |
254 | } | |
255 | ||
256 | extern unsigned int nf_conntrack_htable_size; | |
257 | ||
258 | #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) | |
259 | ||
260 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
261 | #include <linux/notifier.h> | |
262 | #include <linux/interrupt.h> | |
263 | ||
264 | struct nf_conntrack_ecache { | |
265 | struct nf_conn *ct; | |
266 | unsigned int events; | |
267 | }; | |
268 | DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache); | |
269 | ||
270 | #define CONNTRACK_ECACHE(x) (__get_cpu_var(nf_conntrack_ecache).x) | |
271 | ||
272 | extern struct notifier_block *nf_conntrack_chain; | |
273 | extern struct notifier_block *nf_conntrack_expect_chain; | |
274 | ||
275 | static inline int nf_conntrack_register_notifier(struct notifier_block *nb) | |
276 | { | |
277 | return notifier_chain_register(&nf_conntrack_chain, nb); | |
278 | } | |
279 | ||
280 | static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb) | |
281 | { | |
282 | return notifier_chain_unregister(&nf_conntrack_chain, nb); | |
283 | } | |
284 | ||
285 | static inline int | |
286 | nf_conntrack_expect_register_notifier(struct notifier_block *nb) | |
287 | { | |
288 | return notifier_chain_register(&nf_conntrack_expect_chain, nb); | |
289 | } | |
290 | ||
291 | static inline int | |
292 | nf_conntrack_expect_unregister_notifier(struct notifier_block *nb) | |
293 | { | |
294 | return notifier_chain_unregister(&nf_conntrack_expect_chain, nb); | |
295 | } | |
296 | ||
297 | extern void nf_ct_deliver_cached_events(const struct nf_conn *ct); | |
298 | extern void __nf_ct_event_cache_init(struct nf_conn *ct); | |
299 | ||
300 | static inline void | |
301 | nf_conntrack_event_cache(enum ip_conntrack_events event, | |
302 | const struct sk_buff *skb) | |
303 | { | |
304 | struct nf_conn *ct = (struct nf_conn *)skb->nfct; | |
305 | struct nf_conntrack_ecache *ecache; | |
306 | ||
307 | local_bh_disable(); | |
308 | ecache = &__get_cpu_var(nf_conntrack_ecache); | |
309 | if (ct != ecache->ct) | |
310 | __nf_ct_event_cache_init(ct); | |
311 | ecache->events |= event; | |
312 | local_bh_enable(); | |
313 | } | |
314 | ||
315 | static inline void nf_conntrack_event(enum ip_conntrack_events event, | |
316 | struct nf_conn *ct) | |
317 | { | |
318 | if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) | |
319 | notifier_call_chain(&nf_conntrack_chain, event, ct); | |
320 | } | |
321 | ||
322 | static inline void | |
323 | nf_conntrack_expect_event(enum ip_conntrack_expect_events event, | |
324 | struct nf_conntrack_expect *exp) | |
325 | { | |
326 | notifier_call_chain(&nf_conntrack_expect_chain, event, exp); | |
327 | } | |
328 | #else /* CONFIG_NF_CONNTRACK_EVENTS */ | |
329 | static inline void nf_conntrack_event_cache(enum ip_conntrack_events event, | |
330 | const struct sk_buff *skb) {} | |
331 | static inline void nf_conntrack_event(enum ip_conntrack_events event, | |
332 | struct nf_conn *ct) {} | |
333 | static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {} | |
334 | static inline void | |
335 | nf_conntrack_expect_event(enum ip_conntrack_expect_events event, | |
336 | struct nf_conntrack_expect *exp) {} | |
337 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ | |
338 | ||
339 | /* no helper, no nat */ | |
340 | #define NF_CT_F_BASIC 0 | |
341 | /* for helper */ | |
342 | #define NF_CT_F_HELP 1 | |
343 | /* for nat. */ | |
344 | #define NF_CT_F_NAT 2 | |
345 | #define NF_CT_F_NUM 4 | |
346 | ||
347 | extern int | |
348 | nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size, | |
349 | int (*init_conntrack)(struct nf_conn *, u_int32_t)); | |
350 | extern void | |
351 | nf_conntrack_unregister_cache(u_int32_t features); | |
352 | ||
353 | #endif /* __KERNEL__ */ | |
354 | #endif /* _NF_CONNTRACK_H */ |