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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__ | |
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 | ||
dc808fe2 HW |
70 | /* nf_conn feature for connections that have a helper */ |
71 | struct nf_conn_help { | |
72 | /* Helper. if any */ | |
73 | struct nf_conntrack_helper *helper; | |
74 | ||
75 | union nf_conntrack_help help; | |
76 | ||
77 | /* Current number of expected connections */ | |
78 | unsigned int expecting; | |
79 | }; | |
80 | ||
81 | ||
9fb9cbb1 YK |
82 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
83 | struct nf_conn | |
84 | { | |
85 | /* Usage count in here is 1 for hash table/destruct timer, 1 per skb, | |
86 | plus 1 for any connection(s) we are `master' for */ | |
87 | struct nf_conntrack ct_general; | |
88 | ||
89 | /* XXX should I move this to the tail ? - Y.K */ | |
90 | /* These are my tuples; original and reply */ | |
91 | struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; | |
92 | ||
93 | /* Have we seen traffic both ways yet? (bitset) */ | |
94 | unsigned long status; | |
95 | ||
dc808fe2 HW |
96 | /* If we were expected by an expectation, this will be it */ |
97 | struct nf_conn *master; | |
98 | ||
9fb9cbb1 YK |
99 | /* Timer function; drops refcnt when it goes off. */ |
100 | struct timer_list timeout; | |
101 | ||
102 | #ifdef CONFIG_NF_CT_ACCT | |
103 | /* Accounting Information (same cache line as other written members) */ | |
104 | struct ip_conntrack_counter counters[IP_CT_DIR_MAX]; | |
105 | #endif | |
9fb9cbb1 | 106 | |
c1d10adb PNA |
107 | /* Unique ID that identifies this conntrack*/ |
108 | unsigned int id; | |
109 | ||
9fb9cbb1 YK |
110 | /* features - nat, helper, ... used by allocating system */ |
111 | u_int32_t features; | |
112 | ||
9fb9cbb1 YK |
113 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
114 | u_int32_t mark; | |
115 | #endif | |
116 | ||
dc808fe2 HW |
117 | /* Storage reserved for other modules: */ |
118 | union nf_conntrack_proto proto; | |
9fb9cbb1 | 119 | |
dc808fe2 HW |
120 | /* features dynamically at the end: helper, nat (both optional) */ |
121 | char data[0]; | |
9fb9cbb1 YK |
122 | }; |
123 | ||
124 | struct nf_conntrack_expect | |
125 | { | |
126 | /* Internal linked list (global expectation list) */ | |
127 | struct list_head list; | |
128 | ||
129 | /* We expect this tuple, with the following mask */ | |
130 | struct nf_conntrack_tuple tuple, mask; | |
131 | ||
132 | /* Function to call after setup and insertion */ | |
133 | void (*expectfn)(struct nf_conn *new, | |
134 | struct nf_conntrack_expect *this); | |
135 | ||
136 | /* The conntrack of the master connection */ | |
137 | struct nf_conn *master; | |
138 | ||
139 | /* Timer function; deletes the expectation. */ | |
140 | struct timer_list timeout; | |
141 | ||
142 | /* Usage count. */ | |
143 | atomic_t use; | |
144 | ||
c1d10adb PNA |
145 | /* Unique ID */ |
146 | unsigned int id; | |
147 | ||
9fb9cbb1 YK |
148 | /* Flags */ |
149 | unsigned int flags; | |
150 | ||
151 | #ifdef CONFIG_NF_NAT_NEEDED | |
152 | /* This is the original per-proto part, used to map the | |
153 | * expected connection the way the recipient expects. */ | |
154 | union nf_conntrack_manip_proto saved_proto; | |
155 | /* Direction relative to the master connection. */ | |
156 | enum ip_conntrack_dir dir; | |
157 | #endif | |
158 | }; | |
159 | ||
160 | #define NF_CT_EXPECT_PERMANENT 0x1 | |
161 | ||
162 | static inline struct nf_conn * | |
163 | nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) | |
164 | { | |
165 | return container_of(hash, struct nf_conn, | |
166 | tuplehash[hash->tuple.dst.dir]); | |
167 | } | |
168 | ||
169 | /* get master conntrack via master expectation */ | |
170 | #define master_ct(conntr) (conntr->master) | |
171 | ||
172 | /* Alter reply tuple (maybe alter helper). */ | |
173 | extern void | |
174 | nf_conntrack_alter_reply(struct nf_conn *conntrack, | |
175 | const struct nf_conntrack_tuple *newreply); | |
176 | ||
177 | /* Is this tuple taken? (ignoring any belonging to the given | |
178 | conntrack). */ | |
179 | extern int | |
180 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
181 | const struct nf_conn *ignored_conntrack); | |
182 | ||
183 | /* Return conntrack_info and tuple hash for given skb. */ | |
184 | static inline struct nf_conn * | |
185 | nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) | |
186 | { | |
187 | *ctinfo = skb->nfctinfo; | |
188 | return (struct nf_conn *)skb->nfct; | |
189 | } | |
190 | ||
191 | /* decrement reference count on a conntrack */ | |
192 | static inline void nf_ct_put(struct nf_conn *ct) | |
193 | { | |
194 | NF_CT_ASSERT(ct); | |
195 | nf_conntrack_put(&ct->ct_general); | |
196 | } | |
197 | ||
b9f78f9f PNA |
198 | /* Protocol module loading */ |
199 | extern int nf_ct_l3proto_try_module_get(unsigned short l3proto); | |
200 | extern void nf_ct_l3proto_module_put(unsigned short l3proto); | |
201 | ||
c1d10adb PNA |
202 | extern struct nf_conntrack_tuple_hash * |
203 | __nf_conntrack_find(const struct nf_conntrack_tuple *tuple, | |
204 | const struct nf_conn *ignored_conntrack); | |
205 | ||
206 | extern void nf_conntrack_hash_insert(struct nf_conn *ct); | |
207 | ||
208 | extern struct nf_conntrack_expect * | |
209 | __nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple); | |
210 | ||
211 | extern struct nf_conntrack_expect * | |
212 | nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple); | |
213 | ||
214 | extern void nf_ct_unlink_expect(struct nf_conntrack_expect *exp); | |
215 | ||
216 | extern void nf_ct_remove_expectations(struct nf_conn *ct); | |
217 | ||
218 | extern void nf_conntrack_flush(void); | |
219 | ||
220 | extern struct nf_conntrack_helper * | |
221 | nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple); | |
222 | extern void nf_ct_helper_put(struct nf_conntrack_helper *helper); | |
223 | ||
224 | extern struct nf_conntrack_helper * | |
225 | __nf_conntrack_helper_find_byname(const char *name); | |
226 | ||
9fb9cbb1 YK |
227 | extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
228 | const struct nf_conntrack_tuple *orig); | |
229 | ||
230 | extern void __nf_ct_refresh_acct(struct nf_conn *ct, | |
231 | enum ip_conntrack_info ctinfo, | |
232 | const struct sk_buff *skb, | |
233 | unsigned long extra_jiffies, | |
234 | int do_acct); | |
235 | ||
236 | /* Refresh conntrack for this many jiffies and do accounting */ | |
237 | static inline void nf_ct_refresh_acct(struct nf_conn *ct, | |
238 | enum ip_conntrack_info ctinfo, | |
239 | const struct sk_buff *skb, | |
240 | unsigned long extra_jiffies) | |
241 | { | |
242 | __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); | |
243 | } | |
244 | ||
245 | /* Refresh conntrack for this many jiffies */ | |
246 | static inline void nf_ct_refresh(struct nf_conn *ct, | |
247 | const struct sk_buff *skb, | |
248 | unsigned long extra_jiffies) | |
249 | { | |
250 | __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); | |
251 | } | |
252 | ||
253 | /* These are for NAT. Icky. */ | |
254 | /* Update TCP window tracking data when NAT mangles the packet */ | |
255 | extern void nf_conntrack_tcp_update(struct sk_buff *skb, | |
256 | unsigned int dataoff, | |
257 | struct nf_conn *conntrack, | |
258 | int dir); | |
259 | ||
260 | /* Call me when a conntrack is destroyed. */ | |
261 | extern void (*nf_conntrack_destroyed)(struct nf_conn *conntrack); | |
262 | ||
263 | /* Fake conntrack entry for untracked connections */ | |
264 | extern struct nf_conn nf_conntrack_untracked; | |
265 | ||
266 | extern int nf_ct_no_defrag; | |
267 | ||
268 | /* Iterate over all conntracks: if iter returns true, it's deleted. */ | |
269 | extern void | |
270 | nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data); | |
271 | extern void nf_conntrack_free(struct nf_conn *ct); | |
272 | extern struct nf_conn * | |
273 | nf_conntrack_alloc(const struct nf_conntrack_tuple *orig, | |
274 | const struct nf_conntrack_tuple *repl); | |
275 | ||
276 | /* It's confirmed if it is, or has been in the hash table. */ | |
277 | static inline int nf_ct_is_confirmed(struct nf_conn *ct) | |
278 | { | |
279 | return test_bit(IPS_CONFIRMED_BIT, &ct->status); | |
280 | } | |
281 | ||
282 | static inline int nf_ct_is_dying(struct nf_conn *ct) | |
283 | { | |
284 | return test_bit(IPS_DYING_BIT, &ct->status); | |
285 | } | |
286 | ||
287 | extern unsigned int nf_conntrack_htable_size; | |
288 | ||
289 | #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) | |
290 | ||
291 | #ifdef CONFIG_NF_CONNTRACK_EVENTS | |
292 | #include <linux/notifier.h> | |
293 | #include <linux/interrupt.h> | |
294 | ||
295 | struct nf_conntrack_ecache { | |
296 | struct nf_conn *ct; | |
297 | unsigned int events; | |
298 | }; | |
299 | DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache); | |
300 | ||
301 | #define CONNTRACK_ECACHE(x) (__get_cpu_var(nf_conntrack_ecache).x) | |
302 | ||
e041c683 AS |
303 | extern struct atomic_notifier_head nf_conntrack_chain; |
304 | extern struct atomic_notifier_head nf_conntrack_expect_chain; | |
9fb9cbb1 YK |
305 | |
306 | static inline int nf_conntrack_register_notifier(struct notifier_block *nb) | |
307 | { | |
e041c683 | 308 | return atomic_notifier_chain_register(&nf_conntrack_chain, nb); |
9fb9cbb1 YK |
309 | } |
310 | ||
311 | static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb) | |
312 | { | |
e041c683 | 313 | return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb); |
9fb9cbb1 YK |
314 | } |
315 | ||
316 | static inline int | |
317 | nf_conntrack_expect_register_notifier(struct notifier_block *nb) | |
318 | { | |
e041c683 | 319 | return atomic_notifier_chain_register(&nf_conntrack_expect_chain, nb); |
9fb9cbb1 YK |
320 | } |
321 | ||
322 | static inline int | |
323 | nf_conntrack_expect_unregister_notifier(struct notifier_block *nb) | |
324 | { | |
e041c683 AS |
325 | return atomic_notifier_chain_unregister(&nf_conntrack_expect_chain, |
326 | nb); | |
9fb9cbb1 YK |
327 | } |
328 | ||
329 | extern void nf_ct_deliver_cached_events(const struct nf_conn *ct); | |
330 | extern void __nf_ct_event_cache_init(struct nf_conn *ct); | |
331 | ||
332 | static inline void | |
333 | nf_conntrack_event_cache(enum ip_conntrack_events event, | |
334 | const struct sk_buff *skb) | |
335 | { | |
336 | struct nf_conn *ct = (struct nf_conn *)skb->nfct; | |
337 | struct nf_conntrack_ecache *ecache; | |
338 | ||
339 | local_bh_disable(); | |
340 | ecache = &__get_cpu_var(nf_conntrack_ecache); | |
341 | if (ct != ecache->ct) | |
342 | __nf_ct_event_cache_init(ct); | |
343 | ecache->events |= event; | |
344 | local_bh_enable(); | |
345 | } | |
346 | ||
347 | static inline void nf_conntrack_event(enum ip_conntrack_events event, | |
348 | struct nf_conn *ct) | |
349 | { | |
350 | if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) | |
e041c683 | 351 | atomic_notifier_call_chain(&nf_conntrack_chain, event, ct); |
9fb9cbb1 YK |
352 | } |
353 | ||
354 | static inline void | |
355 | nf_conntrack_expect_event(enum ip_conntrack_expect_events event, | |
356 | struct nf_conntrack_expect *exp) | |
357 | { | |
e041c683 | 358 | atomic_notifier_call_chain(&nf_conntrack_expect_chain, event, exp); |
9fb9cbb1 YK |
359 | } |
360 | #else /* CONFIG_NF_CONNTRACK_EVENTS */ | |
361 | static inline void nf_conntrack_event_cache(enum ip_conntrack_events event, | |
362 | const struct sk_buff *skb) {} | |
363 | static inline void nf_conntrack_event(enum ip_conntrack_events event, | |
364 | struct nf_conn *ct) {} | |
365 | static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {} | |
366 | static inline void | |
367 | nf_conntrack_expect_event(enum ip_conntrack_expect_events event, | |
368 | struct nf_conntrack_expect *exp) {} | |
369 | #endif /* CONFIG_NF_CONNTRACK_EVENTS */ | |
370 | ||
371 | /* no helper, no nat */ | |
372 | #define NF_CT_F_BASIC 0 | |
373 | /* for helper */ | |
374 | #define NF_CT_F_HELP 1 | |
375 | /* for nat. */ | |
376 | #define NF_CT_F_NAT 2 | |
377 | #define NF_CT_F_NUM 4 | |
378 | ||
379 | extern int | |
dc808fe2 | 380 | nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size); |
9fb9cbb1 YK |
381 | extern void |
382 | nf_conntrack_unregister_cache(u_int32_t features); | |
383 | ||
dc808fe2 HW |
384 | /* valid combinations: |
385 | * basic: nf_conn, nf_conn .. nf_conn_help | |
386 | * nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat, nf_conn help | |
387 | */ | |
388 | static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct) | |
389 | { | |
390 | unsigned int offset = sizeof(struct nf_conn); | |
391 | ||
392 | if (!(ct->features & NF_CT_F_HELP)) | |
393 | return NULL; | |
394 | ||
395 | return (struct nf_conn_help *) ((void *)ct + offset); | |
396 | } | |
397 | ||
9fb9cbb1 YK |
398 | #endif /* __KERNEL__ */ |
399 | #endif /* _NF_CONNTRACK_H */ |