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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> | |
2bc78049 | 23 | #include <linux/netfilter/nf_conntrack_dccp.h> |
9fb9cbb1 | 24 | #include <linux/netfilter/nf_conntrack_sctp.h> |
f09943fe | 25 | #include <linux/netfilter/nf_conntrack_proto_gre.h> |
9fb9cbb1 YK |
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 */ | |
2bc78049 | 33 | struct nf_ct_dccp dccp; |
9fb9cbb1 YK |
34 | struct ip_ct_sctp sctp; |
35 | struct ip_ct_tcp tcp; | |
f09943fe | 36 | struct nf_ct_gre gre; |
9fb9cbb1 YK |
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> | |
f09943fe | 45 | #include <linux/netfilter/nf_conntrack_pptp.h> |
f587de0e | 46 | #include <linux/netfilter/nf_conntrack_h323.h> |
6fecd198 | 47 | #include <linux/netfilter/nf_conntrack_sane.h> |
0f32a40f | 48 | #include <linux/netfilter/nf_conntrack_sip.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; |
0f32a40f | 57 | struct nf_ct_sip_master ct_sip_info; |
9fb9cbb1 YK |
58 | }; |
59 | ||
60 | #include <linux/types.h> | |
61 | #include <linux/skbuff.h> | |
d7fe0f24 | 62 | #include <linux/timer.h> |
9fb9cbb1 YK |
63 | |
64 | #ifdef CONFIG_NETFILTER_DEBUG | |
55871d04 | 65 | #define NF_CT_ASSERT(x) WARN_ON(!(x)) |
9fb9cbb1 YK |
66 | #else |
67 | #define NF_CT_ASSERT(x) | |
68 | #endif | |
69 | ||
70 | struct nf_conntrack_helper; | |
71 | ||
6002f266 | 72 | /* Must be kept in sync with the classes defined by helpers */ |
0d0ab037 | 73 | #define NF_CT_MAX_EXPECT_CLASSES 3 |
6002f266 | 74 | |
dc808fe2 HW |
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 | ||
b560580a PM |
82 | struct hlist_head expectations; |
83 | ||
dc808fe2 | 84 | /* Current number of expected connections */ |
6002f266 | 85 | u8 expecting[NF_CT_MAX_EXPECT_CLASSES]; |
dc808fe2 HW |
86 | }; |
87 | ||
9fb9cbb1 | 88 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
f8eb24a8 PM |
89 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
90 | ||
ea781f19 | 91 | struct nf_conn { |
9fb9cbb1 YK |
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 | ||
440f0d58 PM |
96 | spinlock_t lock; |
97 | ||
9fb9cbb1 YK |
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 | ||
dc808fe2 HW |
105 | /* If we were expected by an expectation, this will be it */ |
106 | struct nf_conn *master; | |
107 | ||
9fb9cbb1 YK |
108 | /* Timer function; drops refcnt when it goes off. */ |
109 | struct timer_list timeout; | |
110 | ||
9fb9cbb1 YK |
111 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
112 | u_int32_t mark; | |
113 | #endif | |
114 | ||
7c9728c3 JM |
115 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
116 | u_int32_t secmark; | |
117 | #endif | |
118 | ||
dc808fe2 HW |
119 | /* Storage reserved for other modules: */ |
120 | union nf_conntrack_proto proto; | |
9fb9cbb1 | 121 | |
ecfab2c9 YK |
122 | /* Extensions */ |
123 | struct nf_ct_ext *ext; | |
5a1fb391 AD |
124 | #ifdef CONFIG_NET_NS |
125 | struct net *ct_net; | |
126 | #endif | |
9fb9cbb1 YK |
127 | }; |
128 | ||
9fb9cbb1 YK |
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 | ||
5e8fbe2a PM |
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 | ||
f2f3e38c PNA |
146 | #define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) |
147 | ||
9fb9cbb1 YK |
148 | /* get master conntrack via master expectation */ |
149 | #define master_ct(conntr) (conntr->master) | |
150 | ||
5a1fb391 AD |
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 | ||
9fb9cbb1 YK |
162 | /* Alter reply tuple (maybe alter helper). */ |
163 | extern void | |
c88130bc | 164 | nf_conntrack_alter_reply(struct nf_conn *ct, |
9fb9cbb1 YK |
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 | ||
b9f78f9f PNA |
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 | ||
ea781f19 ED |
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); | |
ac565e5f | 199 | |
c1d10adb | 200 | extern struct nf_conntrack_tuple_hash * |
400dad39 | 201 | __nf_conntrack_find(struct net *net, const struct nf_conntrack_tuple *tuple); |
c1d10adb PNA |
202 | |
203 | extern void nf_conntrack_hash_insert(struct nf_conn *ct); | |
dd7669a9 PNA |
204 | extern void nf_ct_delete_from_lists(struct nf_conn *ct); |
205 | extern void nf_ct_insert_dying_list(struct nf_conn *ct); | |
c1d10adb | 206 | |
274d383b | 207 | extern void nf_conntrack_flush_report(struct net *net, u32 pid, int report); |
c1d10adb | 208 | |
5f2b4c90 JE |
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); | |
9fb9cbb1 YK |
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 | ||
4c889498 DM |
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); | |
718d4ad9 FH |
242 | |
243 | /* kill conntrack and do accounting */ | |
4c889498 DM |
244 | static inline bool nf_ct_kill_acct(struct nf_conn *ct, |
245 | enum ip_conntrack_info ctinfo, | |
246 | const struct sk_buff *skb) | |
718d4ad9 | 247 | { |
4c889498 | 248 | return __nf_ct_kill_acct(ct, ctinfo, skb, 1); |
718d4ad9 FH |
249 | } |
250 | ||
251 | /* kill conntrack without accounting */ | |
4c889498 | 252 | static inline bool nf_ct_kill(struct nf_conn *ct) |
718d4ad9 | 253 | { |
4c889498 | 254 | return __nf_ct_kill_acct(ct, 0, NULL, 0); |
718d4ad9 | 255 | } |
51091764 | 256 | |
9fb9cbb1 | 257 | /* These are for NAT. Icky. */ |
f9dd09c7 JK |
258 | extern s16 (*nf_ct_nat_offset)(const struct nf_conn *ct, |
259 | enum ip_conntrack_dir dir, | |
260 | u32 seq); | |
9fb9cbb1 | 261 | |
9fb9cbb1 YK |
262 | /* Fake conntrack entry for untracked connections */ |
263 | extern struct nf_conn nf_conntrack_untracked; | |
264 | ||
9fb9cbb1 YK |
265 | /* Iterate over all conntracks: if iter returns true, it's deleted. */ |
266 | extern void | |
400dad39 | 267 | nf_ct_iterate_cleanup(struct net *net, int (*iter)(struct nf_conn *i, void *data), void *data); |
9fb9cbb1 YK |
268 | extern void nf_conntrack_free(struct nf_conn *ct); |
269 | extern struct nf_conn * | |
5a1fb391 AD |
270 | nf_conntrack_alloc(struct net *net, |
271 | const struct nf_conntrack_tuple *orig, | |
b891c5a8 PNA |
272 | const struct nf_conntrack_tuple *repl, |
273 | gfp_t gfp); | |
9fb9cbb1 | 274 | |
b2a15a60 PM |
275 | static inline int nf_ct_is_template(const struct nf_conn *ct) |
276 | { | |
277 | return test_bit(IPS_TEMPLATE_BIT, &ct->status); | |
278 | } | |
279 | ||
9fb9cbb1 YK |
280 | /* It's confirmed if it is, or has been in the hash table. */ |
281 | static inline int nf_ct_is_confirmed(struct nf_conn *ct) | |
282 | { | |
283 | return test_bit(IPS_CONFIRMED_BIT, &ct->status); | |
284 | } | |
285 | ||
286 | static inline int nf_ct_is_dying(struct nf_conn *ct) | |
287 | { | |
288 | return test_bit(IPS_DYING_BIT, &ct->status); | |
289 | } | |
290 | ||
587aa641 PM |
291 | static inline int nf_ct_is_untracked(const struct sk_buff *skb) |
292 | { | |
293 | return (skb->nfct == &nf_conntrack_untracked.ct_general); | |
294 | } | |
295 | ||
fae718dd | 296 | extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); |
9fb9cbb1 | 297 | extern unsigned int nf_conntrack_htable_size; |
e478075c | 298 | extern unsigned int nf_conntrack_max; |
9fb9cbb1 | 299 | |
0d55af87 | 300 | #define NF_CT_STAT_INC(net, count) \ |
4ea7334b | 301 | __this_cpu_inc((net)->ct.stat->count) |
0d55af87 | 302 | #define NF_CT_STAT_INC_ATOMIC(net, count) \ |
c0e912d7 PM |
303 | do { \ |
304 | local_bh_disable(); \ | |
4ea7334b | 305 | __this_cpu_inc((net)->ct.stat->count); \ |
c0e912d7 PM |
306 | local_bh_enable(); \ |
307 | } while (0) | |
9fb9cbb1 | 308 | |
4dc06f96 PNA |
309 | #define MODULE_ALIAS_NFCT_HELPER(helper) \ |
310 | MODULE_ALIAS("nfct-helper-" helper) | |
311 | ||
9fb9cbb1 YK |
312 | #endif /* __KERNEL__ */ |
313 | #endif /* _NF_CONNTRACK_H */ |