]>
Commit | Line | Data |
---|---|---|
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/ipv4/nf_conntrack_icmp.h> |
27 | #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> | |
28 | ||
29 | #include <net/netfilter/nf_conntrack_tuple.h> | |
30 | ||
31 | /* per conntrack: protocol private data */ | |
32 | union nf_conntrack_proto { | |
33 | /* insert conntrack proto private data here */ | |
2bc78049 | 34 | struct nf_ct_dccp dccp; |
9fb9cbb1 YK |
35 | struct ip_ct_sctp sctp; |
36 | struct ip_ct_tcp tcp; | |
37 | struct ip_ct_icmp icmp; | |
38 | struct nf_ct_icmpv6 icmpv6; | |
f09943fe | 39 | struct nf_ct_gre gre; |
9fb9cbb1 YK |
40 | }; |
41 | ||
42 | union nf_conntrack_expect_proto { | |
43 | /* insert expect proto private data here */ | |
44 | }; | |
45 | ||
46 | /* Add protocol helper include file here */ | |
47 | #include <linux/netfilter/nf_conntrack_ftp.h> | |
f09943fe | 48 | #include <linux/netfilter/nf_conntrack_pptp.h> |
f587de0e | 49 | #include <linux/netfilter/nf_conntrack_h323.h> |
6fecd198 | 50 | #include <linux/netfilter/nf_conntrack_sane.h> |
0f32a40f | 51 | #include <linux/netfilter/nf_conntrack_sip.h> |
9fb9cbb1 YK |
52 | |
53 | /* per conntrack: application helper private data */ | |
54 | union nf_conntrack_help { | |
55 | /* insert conntrack helper private data (master) here */ | |
55a73324 | 56 | struct nf_ct_ftp_master ct_ftp_info; |
f09943fe | 57 | struct nf_ct_pptp_master ct_pptp_info; |
f587de0e | 58 | struct nf_ct_h323_master ct_h323_info; |
6fecd198 | 59 | struct nf_ct_sane_master ct_sane_info; |
0f32a40f | 60 | struct nf_ct_sip_master ct_sip_info; |
9fb9cbb1 YK |
61 | }; |
62 | ||
63 | #include <linux/types.h> | |
64 | #include <linux/skbuff.h> | |
d7fe0f24 | 65 | #include <linux/timer.h> |
9fb9cbb1 YK |
66 | |
67 | #ifdef CONFIG_NETFILTER_DEBUG | |
55871d04 | 68 | #define NF_CT_ASSERT(x) WARN_ON(!(x)) |
9fb9cbb1 YK |
69 | #else |
70 | #define NF_CT_ASSERT(x) | |
71 | #endif | |
72 | ||
73 | struct nf_conntrack_helper; | |
74 | ||
6002f266 | 75 | /* Must be kept in sync with the classes defined by helpers */ |
0d0ab037 | 76 | #define NF_CT_MAX_EXPECT_CLASSES 3 |
6002f266 | 77 | |
dc808fe2 HW |
78 | /* nf_conn feature for connections that have a helper */ |
79 | struct nf_conn_help { | |
80 | /* Helper. if any */ | |
81 | struct nf_conntrack_helper *helper; | |
82 | ||
83 | union nf_conntrack_help help; | |
84 | ||
b560580a PM |
85 | struct hlist_head expectations; |
86 | ||
dc808fe2 | 87 | /* Current number of expected connections */ |
6002f266 | 88 | u8 expecting[NF_CT_MAX_EXPECT_CLASSES]; |
dc808fe2 HW |
89 | }; |
90 | ||
91 | ||
9fb9cbb1 | 92 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
f8eb24a8 PM |
93 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
94 | ||
9fb9cbb1 YK |
95 | struct nf_conn |
96 | { | |
97 | /* Usage count in here is 1 for hash table/destruct timer, 1 per skb, | |
98 | plus 1 for any connection(s) we are `master' for */ | |
99 | struct nf_conntrack ct_general; | |
100 | ||
101 | /* XXX should I move this to the tail ? - Y.K */ | |
102 | /* These are my tuples; original and reply */ | |
103 | struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; | |
104 | ||
105 | /* Have we seen traffic both ways yet? (bitset) */ | |
106 | unsigned long status; | |
107 | ||
dc808fe2 HW |
108 | /* If we were expected by an expectation, this will be it */ |
109 | struct nf_conn *master; | |
110 | ||
9fb9cbb1 YK |
111 | /* Timer function; drops refcnt when it goes off. */ |
112 | struct timer_list timeout; | |
113 | ||
114 | #ifdef CONFIG_NF_CT_ACCT | |
115 | /* Accounting Information (same cache line as other written members) */ | |
116 | struct ip_conntrack_counter counters[IP_CT_DIR_MAX]; | |
117 | #endif | |
9fb9cbb1 | 118 | |
9fb9cbb1 YK |
119 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
120 | u_int32_t mark; | |
121 | #endif | |
122 | ||
7c9728c3 JM |
123 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
124 | u_int32_t secmark; | |
125 | #endif | |
126 | ||
dc808fe2 HW |
127 | /* Storage reserved for other modules: */ |
128 | union nf_conntrack_proto proto; | |
9fb9cbb1 | 129 | |
ecfab2c9 YK |
130 | /* Extensions */ |
131 | struct nf_ct_ext *ext; | |
76507f69 PM |
132 | |
133 | struct rcu_head rcu; | |
9fb9cbb1 YK |
134 | }; |
135 | ||
9fb9cbb1 YK |
136 | static inline struct nf_conn * |
137 | nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) | |
138 | { | |
139 | return container_of(hash, struct nf_conn, | |
140 | tuplehash[hash->tuple.dst.dir]); | |
141 | } | |
142 | ||
5e8fbe2a PM |
143 | static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct) |
144 | { | |
145 | return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
146 | } | |
147 | ||
148 | static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct) | |
149 | { | |
150 | return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; | |
151 | } | |
152 | ||
9fb9cbb1 YK |
153 | /* get master conntrack via master expectation */ |
154 | #define master_ct(conntr) (conntr->master) | |
155 | ||
156 | /* Alter reply tuple (maybe alter helper). */ | |
157 | extern void | |
c88130bc | 158 | nf_conntrack_alter_reply(struct nf_conn *ct, |
9fb9cbb1 YK |
159 | const struct nf_conntrack_tuple *newreply); |
160 | ||
161 | /* Is this tuple taken? (ignoring any belonging to the given | |
162 | conntrack). */ | |
163 | extern int | |
164 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
165 | const struct nf_conn *ignored_conntrack); | |
166 | ||
167 | /* Return conntrack_info and tuple hash for given skb. */ | |
168 | static inline struct nf_conn * | |
169 | nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) | |
170 | { | |
171 | *ctinfo = skb->nfctinfo; | |
172 | return (struct nf_conn *)skb->nfct; | |
173 | } | |
174 | ||
175 | /* decrement reference count on a conntrack */ | |
176 | static inline void nf_ct_put(struct nf_conn *ct) | |
177 | { | |
178 | NF_CT_ASSERT(ct); | |
179 | nf_conntrack_put(&ct->ct_general); | |
180 | } | |
181 | ||
b9f78f9f PNA |
182 | /* Protocol module loading */ |
183 | extern int nf_ct_l3proto_try_module_get(unsigned short l3proto); | |
184 | extern void nf_ct_l3proto_module_put(unsigned short l3proto); | |
185 | ||
96eb24d7 | 186 | extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced); |
ac565e5f | 187 | extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, |
96eb24d7 | 188 | unsigned int size); |
ac565e5f | 189 | |
c1d10adb | 190 | extern struct nf_conntrack_tuple_hash * |
ba419aff | 191 | __nf_conntrack_find(const struct nf_conntrack_tuple *tuple); |
c1d10adb PNA |
192 | |
193 | extern void nf_conntrack_hash_insert(struct nf_conn *ct); | |
194 | ||
c1d10adb PNA |
195 | extern void nf_conntrack_flush(void); |
196 | ||
e2a3123f YK |
197 | extern int nf_ct_get_tuplepr(const struct sk_buff *skb, |
198 | unsigned int nhoff, | |
199 | u_int16_t l3num, | |
200 | struct nf_conntrack_tuple *tuple); | |
9fb9cbb1 YK |
201 | extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
202 | const struct nf_conntrack_tuple *orig); | |
203 | ||
204 | extern void __nf_ct_refresh_acct(struct nf_conn *ct, | |
205 | enum ip_conntrack_info ctinfo, | |
206 | const struct sk_buff *skb, | |
207 | unsigned long extra_jiffies, | |
208 | int do_acct); | |
209 | ||
210 | /* Refresh conntrack for this many jiffies and do accounting */ | |
211 | static inline void nf_ct_refresh_acct(struct nf_conn *ct, | |
212 | enum ip_conntrack_info ctinfo, | |
213 | const struct sk_buff *skb, | |
214 | unsigned long extra_jiffies) | |
215 | { | |
216 | __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); | |
217 | } | |
218 | ||
219 | /* Refresh conntrack for this many jiffies */ | |
220 | static inline void nf_ct_refresh(struct nf_conn *ct, | |
221 | const struct sk_buff *skb, | |
222 | unsigned long extra_jiffies) | |
223 | { | |
224 | __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); | |
225 | } | |
226 | ||
227 | /* These are for NAT. Icky. */ | |
228 | /* Update TCP window tracking data when NAT mangles the packet */ | |
82f568fc | 229 | extern void nf_conntrack_tcp_update(const struct sk_buff *skb, |
9fb9cbb1 | 230 | unsigned int dataoff, |
c88130bc | 231 | struct nf_conn *ct, |
9fb9cbb1 YK |
232 | int dir); |
233 | ||
9fb9cbb1 YK |
234 | /* Fake conntrack entry for untracked connections */ |
235 | extern struct nf_conn nf_conntrack_untracked; | |
236 | ||
9fb9cbb1 YK |
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 | ||
587aa641 PM |
256 | static inline int nf_ct_is_untracked(const struct sk_buff *skb) |
257 | { | |
258 | return (skb->nfct == &nf_conntrack_untracked.ct_general); | |
259 | } | |
260 | ||
fae718dd | 261 | extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); |
9fb9cbb1 | 262 | extern unsigned int nf_conntrack_htable_size; |
39a27a35 | 263 | extern int nf_conntrack_checksum; |
f8eb24a8 PM |
264 | extern atomic_t nf_conntrack_count; |
265 | extern int nf_conntrack_max; | |
9fb9cbb1 | 266 | |
f8eb24a8 | 267 | DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); |
9fb9cbb1 | 268 | #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) |
c0e912d7 PM |
269 | #define NF_CT_STAT_INC_ATOMIC(count) \ |
270 | do { \ | |
271 | local_bh_disable(); \ | |
272 | __get_cpu_var(nf_conntrack_stat).count++; \ | |
273 | local_bh_enable(); \ | |
274 | } while (0) | |
9fb9cbb1 | 275 | |
9fb9cbb1 YK |
276 | #endif /* __KERNEL__ */ |
277 | #endif /* _NF_CONNTRACK_H */ |