1 #ifndef _IP_CONNTRACK_H
2 #define _IP_CONNTRACK_H
3 /* Connection state tracking for netfilter. This is separated from,
4 but required by, the NAT layer; it can also be used by an iptables
5 extension. */
6 enum ip_conntrack_info
7 {
8 /* Part of an established connection (either direction). */
9 IP_CT_ESTABLISHED,
10
11 /* Like NEW, but related to an existing connection, or ICMP error
12 (in either direction). */
13 IP_CT_RELATED,
14
15 /* Started a new connection to track (only
16 IP_CT_DIR_ORIGINAL); may be a retransmission. */
17 IP_CT_NEW,
18
19 /* >= this indicates reply direction */
20 IP_CT_IS_REPLY,
21
22 /* Number of distinct IP_CT types (no NEW in reply dirn). */
23 IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
24 };
25
26 /* Bitset representing status of connection. */
27 enum ip_conntrack_status {
28 /* It's an expected connection: bit 0 set. This bit never changed */
29 IPS_EXPECTED_BIT = 0,
30 IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
31
32 /* We've seen packets both ways: bit 1 set. Can be set, not unset. */
33 IPS_SEEN_REPLY_BIT = 1,
34 IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
35
36 /* Conntrack should never be early-expired. */
37 IPS_ASSURED_BIT = 2,
38 IPS_ASSURED = (1 << IPS_ASSURED_BIT),
39
40 /* Connection is confirmed: originating packet has left box */
41 IPS_CONFIRMED_BIT = 3,
42 IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
43
44 /* Connection needs src nat in orig dir. This bit never changed. */
45 IPS_SRC_NAT_BIT = 4,
46 IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
47
48 /* Connection needs dst nat in orig dir. This bit never changed. */
49 IPS_DST_NAT_BIT = 5,
50 IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
51
52 /* Both together. */
53 IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
54
55 /* Connection needs TCP sequence adjusted. */
56 IPS_SEQ_ADJUST_BIT = 6,
57 IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
58
59 /* NAT initialization bits. */
60 IPS_SRC_NAT_DONE_BIT = 7,
61 IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
62
63 IPS_DST_NAT_DONE_BIT = 8,
64 IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
65
66 /* Both together */
67 IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
68 };
69
70 #ifdef __KERNEL__
71 #include <linux/config.h>
72 #include <linux/netfilter_ipv4/ip_conntrack_tuple.h>
73 #include <linux/bitops.h>
74 #include <linux/compiler.h>
75 #include <asm/atomic.h>
76
77 #include <linux/netfilter_ipv4/ip_conntrack_tcp.h>
78 #include <linux/netfilter_ipv4/ip_conntrack_icmp.h>
79 #include <linux/netfilter_ipv4/ip_conntrack_sctp.h>
80
81 /* per conntrack: protocol private data */
82 union ip_conntrack_proto {
83 /* insert conntrack proto private data here */
84 struct ip_ct_sctp sctp;
85 struct ip_ct_tcp tcp;
86 struct ip_ct_icmp icmp;
87 };
88
89 union ip_conntrack_expect_proto {
90 /* insert expect proto private data here */
91 };
92
93 /* Add protocol helper include file here */
94 #include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
95 #include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
96 #include <linux/netfilter_ipv4/ip_conntrack_irc.h>
97
98 /* per conntrack: application helper private data */
99 union ip_conntrack_help {
100 /* insert conntrack helper private data (master) here */
101 struct ip_ct_ftp_master ct_ftp_info;
102 struct ip_ct_irc_master ct_irc_info;
103 };
104
105 #ifdef CONFIG_IP_NF_NAT_NEEDED
106 #include <linux/netfilter_ipv4/ip_nat.h>
107 #endif
108
109 #include <linux/types.h>
110 #include <linux/skbuff.h>
111
112 #ifdef CONFIG_NETFILTER_DEBUG
113 #define IP_NF_ASSERT(x) \
114 do { \
115 if (!(x)) \
116 /* Wooah! I'm tripping my conntrack in a frenzy of \
117 netplay... */ \
118 printk("NF_IP_ASSERT: %s:%i(%s)\n", \
119 __FILE__, __LINE__, __FUNCTION__); \
120 } while(0)
121 #else
122 #define IP_NF_ASSERT(x)
123 #endif
124
125 struct ip_conntrack_counter
126 {
127 u_int64_t packets;
128 u_int64_t bytes;
129 };
130
131 struct ip_conntrack_helper;
132
133 struct ip_conntrack
134 {
135 /* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
136 plus 1 for any connection(s) we are `master' for */
137 struct nf_conntrack ct_general;
138
139 /* Have we seen traffic both ways yet? (bitset) */
140 unsigned long status;
141
142 /* Timer function; drops refcnt when it goes off. */
143 struct timer_list timeout;
144
145 #ifdef CONFIG_IP_NF_CT_ACCT
146 /* Accounting Information (same cache line as other written members) */
147 struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
148 #endif
149 /* If we were expected by an expectation, this will be it */
150 struct ip_conntrack *master;
151
152 /* Current number of expected connections */
153 unsigned int expecting;
154
155 /* Helper, if any. */
156 struct ip_conntrack_helper *helper;
157
158 /* Storage reserved for other modules: */
159 union ip_conntrack_proto proto;
160
161 union ip_conntrack_help help;
162
163 #ifdef CONFIG_IP_NF_NAT_NEEDED
164 struct {
165 struct ip_nat_info info;
166 #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
167 defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
168 int masq_index;
169 #endif
170 } nat;
171 #endif /* CONFIG_IP_NF_NAT_NEEDED */
172
173 #if defined(CONFIG_IP_NF_CONNTRACK_MARK)
174 unsigned long mark;
175 #endif
176
177 /* Traversed often, so hopefully in different cacheline to top */
178 /* These are my tuples; original and reply */
179 struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
180 };
181
182 struct ip_conntrack_expect
183 {
184 /* Internal linked list (global expectation list) */
185 struct list_head list;
186
187 /* We expect this tuple, with the following mask */
188 struct ip_conntrack_tuple tuple, mask;
189
190 /* Function to call after setup and insertion */
191 void (*expectfn)(struct ip_conntrack *new,
192 struct ip_conntrack_expect *this);
193
194 /* The conntrack of the master connection */
195 struct ip_conntrack *master;
196
197 /* Timer function; deletes the expectation. */
198 struct timer_list timeout;
199
200 #ifdef CONFIG_IP_NF_NAT_NEEDED
201 /* This is the original per-proto part, used to map the
202 * expected connection the way the recipient expects. */
203 union ip_conntrack_manip_proto saved_proto;
204 /* Direction relative to the master connection. */
205 enum ip_conntrack_dir dir;
206 #endif
207 };
208
209 static inline struct ip_conntrack *
210 tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
211 {
212 return container_of(hash, struct ip_conntrack,
213 tuplehash[hash->tuple.dst.dir]);
214 }
215
216 /* get master conntrack via master expectation */
217 #define master_ct(conntr) (conntr->master)
218
219 /* Alter reply tuple (maybe alter helper). */
220 extern void
221 ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
222 const struct ip_conntrack_tuple *newreply);
223
224 /* Is this tuple taken? (ignoring any belonging to the given
225 conntrack). */
226 extern int
227 ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
228 const struct ip_conntrack *ignored_conntrack);
229
230 /* Return conntrack_info and tuple hash for given skb. */
231 static inline struct ip_conntrack *
232 ip_conntrack_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
233 {
234 *ctinfo = skb->nfctinfo;
235 return (struct ip_conntrack *)skb->nfct;
236 }
237
238 /* decrement reference count on a conntrack */
239 extern inline void ip_conntrack_put(struct ip_conntrack *ct);
240
241 /* call to create an explicit dependency on ip_conntrack. */
242 extern void need_ip_conntrack(void);
243
244 extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
245 const struct ip_conntrack_tuple *orig);
246
247 /* Refresh conntrack for this many jiffies */
248 extern void ip_ct_refresh_acct(struct ip_conntrack *ct,
249 enum ip_conntrack_info ctinfo,
250 const struct sk_buff *skb,
251 unsigned long extra_jiffies);
252
253 /* These are for NAT. Icky. */
254 /* Update TCP window tracking data when NAT mangles the packet */
255 extern void ip_conntrack_tcp_update(struct sk_buff *skb,
256 struct ip_conntrack *conntrack,
257 enum ip_conntrack_dir dir);
258
259 /* Call me when a conntrack is destroyed. */
260 extern void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack);
261
262 /* Fake conntrack entry for untracked connections */
263 extern struct ip_conntrack ip_conntrack_untracked;
264
265 /* Returns new sk_buff, or NULL */
266 struct sk_buff *
267 ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);
268
269 /* Iterate over all conntracks: if iter returns true, it's deleted. */
270 extern void
271 ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
272 void *data);
273
274 /* It's confirmed if it is, or has been in the hash table. */
275 static inline int is_confirmed(struct ip_conntrack *ct)
276 {
277 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
278 }
279
280 extern unsigned int ip_conntrack_htable_size;
281
282 struct ip_conntrack_stat
283 {
284 unsigned int searched;
285 unsigned int found;
286 unsigned int new;
287 unsigned int invalid;
288 unsigned int ignore;
289 unsigned int delete;
290 unsigned int delete_list;
291 unsigned int insert;
292 unsigned int insert_failed;
293 unsigned int drop;
294 unsigned int early_drop;
295 unsigned int error;
296 unsigned int expect_new;
297 unsigned int expect_create;
298 unsigned int expect_delete;
299 };
300
301 #define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
302
303 #ifdef CONFIG_IP_NF_NAT_NEEDED
304 static inline int ip_nat_initialized(struct ip_conntrack *conntrack,
305 enum ip_nat_manip_type manip)
306 {
307 if (manip == IP_NAT_MANIP_SRC)
308 return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
309 return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
310 }
311 #endif /* CONFIG_IP_NF_NAT_NEEDED */
312
313 #endif /* __KERNEL__ */
314 #endif /* _IP_CONNTRACK_H */
315
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