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> | |
23 | #include <linux/netfilter/nf_conntrack_sctp.h> | |
f09943fe | 24 | #include <linux/netfilter/nf_conntrack_proto_gre.h> |
9fb9cbb1 YK |
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; | |
f09943fe | 37 | struct nf_ct_gre gre; |
9fb9cbb1 YK |
38 | }; |
39 | ||
40 | union nf_conntrack_expect_proto { | |
41 | /* insert expect proto private data here */ | |
42 | }; | |
43 | ||
44 | /* Add protocol helper include file here */ | |
45 | #include <linux/netfilter/nf_conntrack_ftp.h> | |
f09943fe | 46 | #include <linux/netfilter/nf_conntrack_pptp.h> |
f587de0e | 47 | #include <linux/netfilter/nf_conntrack_h323.h> |
6fecd198 | 48 | #include <linux/netfilter/nf_conntrack_sane.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; |
9fb9cbb1 YK |
57 | }; |
58 | ||
59 | #include <linux/types.h> | |
60 | #include <linux/skbuff.h> | |
d7fe0f24 | 61 | #include <linux/timer.h> |
9fb9cbb1 YK |
62 | |
63 | #ifdef CONFIG_NETFILTER_DEBUG | |
64 | #define NF_CT_ASSERT(x) \ | |
65 | do { \ | |
66 | if (!(x)) \ | |
67 | /* Wooah! I'm tripping my conntrack in a frenzy of \ | |
68 | netplay... */ \ | |
69 | printk("NF_CT_ASSERT: %s:%i(%s)\n", \ | |
70 | __FILE__, __LINE__, __FUNCTION__); \ | |
71 | } while(0) | |
72 | #else | |
73 | #define NF_CT_ASSERT(x) | |
74 | #endif | |
75 | ||
76 | struct nf_conntrack_helper; | |
77 | ||
6002f266 PM |
78 | /* Must be kept in sync with the classes defined by helpers */ |
79 | #define NF_CT_MAX_EXPECT_CLASSES 1 | |
80 | ||
dc808fe2 HW |
81 | /* nf_conn feature for connections that have a helper */ |
82 | struct nf_conn_help { | |
83 | /* Helper. if any */ | |
84 | struct nf_conntrack_helper *helper; | |
85 | ||
86 | union nf_conntrack_help help; | |
87 | ||
b560580a PM |
88 | struct hlist_head expectations; |
89 | ||
dc808fe2 | 90 | /* Current number of expected connections */ |
6002f266 | 91 | u8 expecting[NF_CT_MAX_EXPECT_CLASSES]; |
dc808fe2 HW |
92 | }; |
93 | ||
94 | ||
9fb9cbb1 | 95 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
f8eb24a8 PM |
96 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
97 | ||
9fb9cbb1 YK |
98 | struct nf_conn |
99 | { | |
100 | /* Usage count in here is 1 for hash table/destruct timer, 1 per skb, | |
101 | plus 1 for any connection(s) we are `master' for */ | |
102 | struct nf_conntrack ct_general; | |
103 | ||
104 | /* XXX should I move this to the tail ? - Y.K */ | |
105 | /* These are my tuples; original and reply */ | |
106 | struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; | |
107 | ||
108 | /* Have we seen traffic both ways yet? (bitset) */ | |
109 | unsigned long status; | |
110 | ||
dc808fe2 HW |
111 | /* If we were expected by an expectation, this will be it */ |
112 | struct nf_conn *master; | |
113 | ||
9fb9cbb1 YK |
114 | /* Timer function; drops refcnt when it goes off. */ |
115 | struct timer_list timeout; | |
116 | ||
117 | #ifdef CONFIG_NF_CT_ACCT | |
118 | /* Accounting Information (same cache line as other written members) */ | |
119 | struct ip_conntrack_counter counters[IP_CT_DIR_MAX]; | |
120 | #endif | |
9fb9cbb1 | 121 | |
9fb9cbb1 YK |
122 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
123 | u_int32_t mark; | |
124 | #endif | |
125 | ||
7c9728c3 JM |
126 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
127 | u_int32_t secmark; | |
128 | #endif | |
129 | ||
dc808fe2 HW |
130 | /* Storage reserved for other modules: */ |
131 | union nf_conntrack_proto proto; | |
9fb9cbb1 | 132 | |
ecfab2c9 YK |
133 | /* Extensions */ |
134 | struct nf_ct_ext *ext; | |
76507f69 PM |
135 | |
136 | struct rcu_head rcu; | |
9fb9cbb1 YK |
137 | }; |
138 | ||
9fb9cbb1 YK |
139 | static inline struct nf_conn * |
140 | nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) | |
141 | { | |
142 | return container_of(hash, struct nf_conn, | |
143 | tuplehash[hash->tuple.dst.dir]); | |
144 | } | |
145 | ||
146 | /* get master conntrack via master expectation */ | |
147 | #define master_ct(conntr) (conntr->master) | |
148 | ||
149 | /* Alter reply tuple (maybe alter helper). */ | |
150 | extern void | |
c88130bc | 151 | nf_conntrack_alter_reply(struct nf_conn *ct, |
9fb9cbb1 YK |
152 | const struct nf_conntrack_tuple *newreply); |
153 | ||
154 | /* Is this tuple taken? (ignoring any belonging to the given | |
155 | conntrack). */ | |
156 | extern int | |
157 | nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, | |
158 | const struct nf_conn *ignored_conntrack); | |
159 | ||
160 | /* Return conntrack_info and tuple hash for given skb. */ | |
161 | static inline struct nf_conn * | |
162 | nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) | |
163 | { | |
164 | *ctinfo = skb->nfctinfo; | |
165 | return (struct nf_conn *)skb->nfct; | |
166 | } | |
167 | ||
168 | /* decrement reference count on a conntrack */ | |
169 | static inline void nf_ct_put(struct nf_conn *ct) | |
170 | { | |
171 | NF_CT_ASSERT(ct); | |
172 | nf_conntrack_put(&ct->ct_general); | |
173 | } | |
174 | ||
b9f78f9f PNA |
175 | /* Protocol module loading */ |
176 | extern int nf_ct_l3proto_try_module_get(unsigned short l3proto); | |
177 | extern void nf_ct_l3proto_module_put(unsigned short l3proto); | |
178 | ||
96eb24d7 | 179 | extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced); |
ac565e5f | 180 | extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, |
96eb24d7 | 181 | unsigned int size); |
ac565e5f | 182 | |
c1d10adb | 183 | extern struct nf_conntrack_tuple_hash * |
ba419aff | 184 | __nf_conntrack_find(const struct nf_conntrack_tuple *tuple); |
c1d10adb PNA |
185 | |
186 | extern void nf_conntrack_hash_insert(struct nf_conn *ct); | |
187 | ||
c1d10adb PNA |
188 | extern void nf_conntrack_flush(void); |
189 | ||
e2a3123f YK |
190 | extern int nf_ct_get_tuplepr(const struct sk_buff *skb, |
191 | unsigned int nhoff, | |
192 | u_int16_t l3num, | |
193 | struct nf_conntrack_tuple *tuple); | |
9fb9cbb1 YK |
194 | extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
195 | const struct nf_conntrack_tuple *orig); | |
196 | ||
197 | extern void __nf_ct_refresh_acct(struct nf_conn *ct, | |
198 | enum ip_conntrack_info ctinfo, | |
199 | const struct sk_buff *skb, | |
200 | unsigned long extra_jiffies, | |
201 | int do_acct); | |
202 | ||
203 | /* Refresh conntrack for this many jiffies and do accounting */ | |
204 | static inline 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 | { | |
209 | __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); | |
210 | } | |
211 | ||
212 | /* Refresh conntrack for this many jiffies */ | |
213 | static inline void nf_ct_refresh(struct nf_conn *ct, | |
214 | const struct sk_buff *skb, | |
215 | unsigned long extra_jiffies) | |
216 | { | |
217 | __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); | |
218 | } | |
219 | ||
220 | /* These are for NAT. Icky. */ | |
221 | /* Update TCP window tracking data when NAT mangles the packet */ | |
82f568fc | 222 | extern void nf_conntrack_tcp_update(const struct sk_buff *skb, |
9fb9cbb1 | 223 | unsigned int dataoff, |
c88130bc | 224 | struct nf_conn *ct, |
9fb9cbb1 YK |
225 | int dir); |
226 | ||
9fb9cbb1 YK |
227 | /* Fake conntrack entry for untracked connections */ |
228 | extern struct nf_conn nf_conntrack_untracked; | |
229 | ||
9fb9cbb1 YK |
230 | /* Iterate over all conntracks: if iter returns true, it's deleted. */ |
231 | extern void | |
232 | nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data); | |
233 | extern void nf_conntrack_free(struct nf_conn *ct); | |
234 | extern struct nf_conn * | |
235 | nf_conntrack_alloc(const struct nf_conntrack_tuple *orig, | |
236 | const struct nf_conntrack_tuple *repl); | |
237 | ||
238 | /* It's confirmed if it is, or has been in the hash table. */ | |
239 | static inline int nf_ct_is_confirmed(struct nf_conn *ct) | |
240 | { | |
241 | return test_bit(IPS_CONFIRMED_BIT, &ct->status); | |
242 | } | |
243 | ||
244 | static inline int nf_ct_is_dying(struct nf_conn *ct) | |
245 | { | |
246 | return test_bit(IPS_DYING_BIT, &ct->status); | |
247 | } | |
248 | ||
587aa641 PM |
249 | static inline int nf_ct_is_untracked(const struct sk_buff *skb) |
250 | { | |
251 | return (skb->nfct == &nf_conntrack_untracked.ct_general); | |
252 | } | |
253 | ||
fae718dd | 254 | extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); |
9fb9cbb1 | 255 | extern unsigned int nf_conntrack_htable_size; |
39a27a35 | 256 | extern int nf_conntrack_checksum; |
f8eb24a8 PM |
257 | extern atomic_t nf_conntrack_count; |
258 | extern int nf_conntrack_max; | |
9fb9cbb1 | 259 | |
f8eb24a8 | 260 | DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); |
9fb9cbb1 | 261 | #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) |
c0e912d7 PM |
262 | #define NF_CT_STAT_INC_ATOMIC(count) \ |
263 | do { \ | |
264 | local_bh_disable(); \ | |
265 | __get_cpu_var(nf_conntrack_stat).count++; \ | |
266 | local_bh_enable(); \ | |
267 | } while (0) | |
9fb9cbb1 | 268 | |
9fb9cbb1 YK |
269 | #endif /* __KERNEL__ */ |
270 | #endif /* _NF_CONNTRACK_H */ |