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/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_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>
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 nf_ct_dccp dccp;
34 struct ip_ct_sctp sctp;
35 struct ip_ct_tcp tcp;
36 struct nf_ct_gre gre;
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 #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>
49
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;
58 };
59
60 #include <linux/types.h>
61 #include <linux/skbuff.h>
62 #include <linux/timer.h>
63
64 #ifdef CONFIG_NETFILTER_DEBUG
65 #define NF_CT_ASSERT(x) WARN_ON(!(x))
66 #else
67 #define NF_CT_ASSERT(x)
68 #endif
69
70 struct nf_conntrack_helper;
71
72 /* Must be kept in sync with the classes defined by helpers */
73 #define NF_CT_MAX_EXPECT_CLASSES 3
74
75 /* nf_conn feature for connections that have a helper */
76 struct nf_conn_help {
77 /* Helper. if any */
78 struct nf_conntrack_helper *helper;
79
80 union nf_conntrack_help help;
81
82 struct hlist_head expectations;
83
84 /* Current number of expected connections */
85 u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
86 };
87
88 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
89 #include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
90
91 struct nf_conn {
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;
95
96 spinlock_t lock;
97
98 /* XXX should I move this to the tail ? - Y.K */
99 /* These are my tuples; original and reply */
100 struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
101
102 /* Have we seen traffic both ways yet? (bitset) */
103 unsigned long status;
104
105 /* If we were expected by an expectation, this will be it */
106 struct nf_conn *master;
107
108 /* Timer function; drops refcnt when it goes off. */
109 struct timer_list timeout;
110
111 #if defined(CONFIG_NF_CONNTRACK_MARK)
112 u_int32_t mark;
113 #endif
114
115 #ifdef CONFIG_NF_CONNTRACK_SECMARK
116 u_int32_t secmark;
117 #endif
118
119 /* Storage reserved for other modules: */
120 union nf_conntrack_proto proto;
121
122 /* Extensions */
123 struct nf_ct_ext *ext;
124 #ifdef CONFIG_NET_NS
125 struct net *ct_net;
126 #endif
127 };
128
129 static inline struct nf_conn *
130 nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
131 {
132 return container_of(hash, struct nf_conn,
133 tuplehash[hash->tuple.dst.dir]);
134 }
135
136 static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
137 {
138 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
139 }
140
141 static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
142 {
143 return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
144 }
145
146 #define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
147
148 /* get master conntrack via master expectation */
149 #define master_ct(conntr) (conntr->master)
150
151 extern struct net init_net;
152
153 static inline struct net *nf_ct_net(const struct nf_conn *ct)
154 {
155 #ifdef CONFIG_NET_NS
156 return ct->ct_net;
157 #else
158 return &init_net;
159 #endif
160 }
161
162 /* Alter reply tuple (maybe alter helper). */
163 extern void
164 nf_conntrack_alter_reply(struct nf_conn *ct,
165 const struct nf_conntrack_tuple *newreply);
166
167 /* Is this tuple taken? (ignoring any belonging to the given
168 conntrack). */
169 extern int
170 nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
171 const struct nf_conn *ignored_conntrack);
172
173 /* Return conntrack_info and tuple hash for given skb. */
174 static inline struct nf_conn *
175 nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
176 {
177 *ctinfo = skb->nfctinfo;
178 return (struct nf_conn *)skb->nfct;
179 }
180
181 /* decrement reference count on a conntrack */
182 static inline void nf_ct_put(struct nf_conn *ct)
183 {
184 NF_CT_ASSERT(ct);
185 nf_conntrack_put(&ct->ct_general);
186 }
187
188 /* Protocol module loading */
189 extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
190 extern void nf_ct_l3proto_module_put(unsigned short l3proto);
191
192 /*
193 * Allocate a hashtable of hlist_head (if nulls == 0),
194 * or hlist_nulls_head (if nulls == 1)
195 */
196 extern void *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced, int nulls);
197
198 extern void nf_ct_free_hashtable(void *hash, int vmalloced, unsigned int size);
199
200 extern struct nf_conntrack_tuple_hash *
201 __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple);
202
203 extern void nf_conntrack_hash_insert(struct nf_conn *ct);
204 extern void nf_ct_delete_from_lists(struct nf_conn *ct);
205 extern void nf_ct_insert_dying_list(struct nf_conn *ct);
206
207 extern void nf_conntrack_flush_report(struct net *net, u32 pid, int report);
208
209 extern bool nf_ct_get_tuplepr(const struct sk_buff *skb,
210 unsigned int nhoff, u_int16_t l3num,
211 struct nf_conntrack_tuple *tuple);
212 extern bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
213 const struct nf_conntrack_tuple *orig);
214
215 extern void __nf_ct_refresh_acct(struct nf_conn *ct,
216 enum ip_conntrack_info ctinfo,
217 const struct sk_buff *skb,
218 unsigned long extra_jiffies,
219 int do_acct);
220
221 /* Refresh conntrack for this many jiffies and do accounting */
222 static inline void nf_ct_refresh_acct(struct nf_conn *ct,
223 enum ip_conntrack_info ctinfo,
224 const struct sk_buff *skb,
225 unsigned long extra_jiffies)
226 {
227 __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
228 }
229
230 /* Refresh conntrack for this many jiffies */
231 static inline void nf_ct_refresh(struct nf_conn *ct,
232 const struct sk_buff *skb,
233 unsigned long extra_jiffies)
234 {
235 __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
236 }
237
238 extern bool __nf_ct_kill_acct(struct nf_conn *ct,
239 enum ip_conntrack_info ctinfo,
240 const struct sk_buff *skb,
241 int do_acct);
242
243 /* kill conntrack and do accounting */
244 static inline bool nf_ct_kill_acct(struct nf_conn *ct,
245 enum ip_conntrack_info ctinfo,
246 const struct sk_buff *skb)
247 {
248 return __nf_ct_kill_acct(ct, ctinfo, skb, 1);
249 }
250
251 /* kill conntrack without accounting */
252 static inline bool nf_ct_kill(struct nf_conn *ct)
253 {
254 return __nf_ct_kill_acct(ct, 0, NULL, 0);
255 }
256
257 /* These are for NAT. Icky. */
258 extern s16 (*nf_ct_nat_offset)(const struct nf_conn *ct,
259 enum ip_conntrack_dir dir,
260 u32 seq);
261
262 /* Fake conntrack entry for untracked connections */
263 extern struct nf_conn nf_conntrack_untracked;
264
265 /* Iterate over all conntracks: if iter returns true, it's deleted. */
266 extern void
267 nf_ct_iterate_cleanup(struct net *net, int (*iter)(struct nf_conn *i, void *data), void *data);
268 extern void nf_conntrack_free(struct nf_conn *ct);
269 extern struct nf_conn *
270 nf_conntrack_alloc(struct net *net,
271 const struct nf_conntrack_tuple *orig,
272 const struct nf_conntrack_tuple *repl,
273 gfp_t gfp);
274
275 /* It's confirmed if it is, or has been in the hash table. */
276 static inline int nf_ct_is_confirmed(struct nf_conn *ct)
277 {
278 return test_bit(IPS_CONFIRMED_BIT, &ct->status);
279 }
280
281 static inline int nf_ct_is_dying(struct nf_conn *ct)
282 {
283 return test_bit(IPS_DYING_BIT, &ct->status);
284 }
285
286 static inline int nf_ct_is_untracked(const struct sk_buff *skb)
287 {
288 return (skb->nfct == &nf_conntrack_untracked.ct_general);
289 }
290
291 extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
292 extern unsigned int nf_conntrack_htable_size;
293 extern unsigned int nf_conntrack_max;
294
295 #define NF_CT_STAT_INC(net, count) \
296 (per_cpu_ptr((net)->ct.stat, raw_smp_processor_id())->count++)
297 #define NF_CT_STAT_INC_ATOMIC(net, count) \
298 do { \
299 local_bh_disable(); \
300 per_cpu_ptr((net)->ct.stat, raw_smp_processor_id())->count++; \
301 local_bh_enable(); \
302 } while (0)
303
304 #define MODULE_ALIAS_NFCT_HELPER(helper) \
305 MODULE_ALIAS("nfct-helper-" helper)
306
307 #endif /* __KERNEL__ */
308 #endif /* _NF_CONNTRACK_H */
309
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