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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 | ||
9fb9cbb1 YK |
17 | #include <linux/bitops.h> |
18 | #include <linux/compiler.h> | |
60063497 | 19 | #include <linux/atomic.h> |
9fb9cbb1 YK |
20 | |
21 | #include <linux/netfilter/nf_conntrack_tcp.h> | |
2bc78049 | 22 | #include <linux/netfilter/nf_conntrack_dccp.h> |
9fb9cbb1 | 23 | #include <linux/netfilter/nf_conntrack_sctp.h> |
f09943fe | 24 | #include <linux/netfilter/nf_conntrack_proto_gre.h> |
9fb9cbb1 YK |
25 | #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> |
26 | ||
27 | #include <net/netfilter/nf_conntrack_tuple.h> | |
28 | ||
29 | /* per conntrack: protocol private data */ | |
30 | union nf_conntrack_proto { | |
31 | /* insert conntrack proto private data here */ | |
2bc78049 | 32 | struct nf_ct_dccp dccp; |
9fb9cbb1 YK |
33 | struct ip_ct_sctp sctp; |
34 | struct ip_ct_tcp tcp; | |
f09943fe | 35 | struct nf_ct_gre gre; |
9fb9cbb1 YK |
36 | }; |
37 | ||
38 | union nf_conntrack_expect_proto { | |
39 | /* insert expect proto private data here */ | |
40 | }; | |
41 | ||
9fb9cbb1 YK |
42 | #include <linux/types.h> |
43 | #include <linux/skbuff.h> | |
d7fe0f24 | 44 | #include <linux/timer.h> |
9fb9cbb1 YK |
45 | |
46 | #ifdef CONFIG_NETFILTER_DEBUG | |
55871d04 | 47 | #define NF_CT_ASSERT(x) WARN_ON(!(x)) |
9fb9cbb1 YK |
48 | #else |
49 | #define NF_CT_ASSERT(x) | |
50 | #endif | |
51 | ||
52 | struct nf_conntrack_helper; | |
53 | ||
6002f266 | 54 | /* Must be kept in sync with the classes defined by helpers */ |
9d288dff | 55 | #define NF_CT_MAX_EXPECT_CLASSES 4 |
6002f266 | 56 | |
dc808fe2 HW |
57 | /* nf_conn feature for connections that have a helper */ |
58 | struct nf_conn_help { | |
59 | /* Helper. if any */ | |
0906a372 | 60 | struct nf_conntrack_helper __rcu *helper; |
dc808fe2 | 61 | |
b560580a PM |
62 | struct hlist_head expectations; |
63 | ||
dc808fe2 | 64 | /* Current number of expected connections */ |
6002f266 | 65 | u8 expecting[NF_CT_MAX_EXPECT_CLASSES]; |
1afc5679 PNA |
66 | |
67 | /* private helper information. */ | |
68 | char data[]; | |
dc808fe2 HW |
69 | }; |
70 | ||
9fb9cbb1 | 71 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
f8eb24a8 PM |
72 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
73 | ||
ea781f19 | 74 | struct nf_conn { |
9fb9cbb1 | 75 | /* Usage count in here is 1 for hash table/destruct timer, 1 per skb, |
b476b72a JDB |
76 | * plus 1 for any connection(s) we are `master' for |
77 | * | |
78 | * Hint, SKB address this struct and refcnt via skb->nfct and | |
79 | * helpers nf_conntrack_get() and nf_conntrack_put(). | |
80 | * Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt, | |
81 | * beware nf_ct_get() is different and don't inc refcnt. | |
82 | */ | |
9fb9cbb1 YK |
83 | struct nf_conntrack ct_general; |
84 | ||
b7779d06 JDB |
85 | spinlock_t lock; |
86 | u16 cpu; | |
440f0d58 | 87 | |
9fb9cbb1 YK |
88 | /* XXX should I move this to the tail ? - Y.K */ |
89 | /* These are my tuples; original and reply */ | |
90 | struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; | |
91 | ||
92 | /* Have we seen traffic both ways yet? (bitset) */ | |
93 | unsigned long status; | |
94 | ||
95 | /* Timer function; drops refcnt when it goes off. */ | |
96 | struct timer_list timeout; | |
97 | ||
0c5c9fb5 EB |
98 | possible_net_t ct_net; |
99 | ||
c41884ce FW |
100 | /* all members below initialized via memset */ |
101 | u8 __nfct_init_offset[0]; | |
102 | ||
103 | /* If we were expected by an expectation, this will be it */ | |
104 | struct nf_conn *master; | |
105 | ||
9fb9cbb1 YK |
106 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
107 | u_int32_t mark; | |
108 | #endif | |
109 | ||
7c9728c3 JM |
110 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
111 | u_int32_t secmark; | |
112 | #endif | |
113 | ||
ecfab2c9 YK |
114 | /* Extensions */ |
115 | struct nf_ct_ext *ext; | |
e5fc9e7a CG |
116 | |
117 | /* Storage reserved for other modules, must be the last member */ | |
118 | union nf_conntrack_proto proto; | |
9fb9cbb1 YK |
119 | }; |
120 | ||
9fb9cbb1 YK |
121 | static inline struct nf_conn * |
122 | nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) | |
123 | { | |
124 | return container_of(hash, struct nf_conn, | |
125 | tuplehash[hash->tuple.dst.dir]); | |
126 | } | |
127 | ||
5e8fbe2a PM |
128 | static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct) |
129 | { | |
130 | return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; | |
131 | } | |
132 | ||
133 | static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct) | |
134 | { | |
135 | return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; | |
136 | } | |
137 | ||
f2f3e38c PNA |
138 | #define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) |
139 | ||
9fb9cbb1 YK |
140 | /* get master conntrack via master expectation */ |
141 | #define master_ct(conntr) (conntr->master) | |
142 | ||
5a1fb391 AD |
143 | extern struct net init_net; |
144 | ||
145 | static inline struct net *nf_ct_net(const struct nf_conn *ct) | |
146 | { | |
c2d9ba9b | 147 | return read_pnet(&ct->ct_net); |
5a1fb391 AD |
148 | } |
149 | ||
9fb9cbb1 | 150 | /* Alter reply tuple (maybe alter helper). */ |
4e77be46 JP |
151 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
152 | const struct nf_conntrack_tuple *newreply); | |
9fb9cbb1 YK |
153 | |
154 | /* Is this tuple taken? (ignoring any belonging to the given | |
155 | conntrack). */ | |
4e77be46 JP |
156 | int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
157 | const struct nf_conn *ignored_conntrack); | |
9fb9cbb1 YK |
158 | |
159 | /* Return conntrack_info and tuple hash for given skb. */ | |
160 | static inline struct nf_conn * | |
161 | nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) | |
162 | { | |
163 | *ctinfo = skb->nfctinfo; | |
164 | return (struct nf_conn *)skb->nfct; | |
165 | } | |
166 | ||
167 | /* decrement reference count on a conntrack */ | |
168 | static inline void nf_ct_put(struct nf_conn *ct) | |
169 | { | |
170 | NF_CT_ASSERT(ct); | |
171 | nf_conntrack_put(&ct->ct_general); | |
172 | } | |
173 | ||
b9f78f9f | 174 | /* Protocol module loading */ |
4e77be46 JP |
175 | int nf_ct_l3proto_try_module_get(unsigned short l3proto); |
176 | void nf_ct_l3proto_module_put(unsigned short l3proto); | |
b9f78f9f | 177 | |
ea781f19 ED |
178 | /* |
179 | * Allocate a hashtable of hlist_head (if nulls == 0), | |
180 | * or hlist_nulls_head (if nulls == 1) | |
181 | */ | |
4e77be46 | 182 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls); |
ea781f19 | 183 | |
4e77be46 | 184 | void nf_ct_free_hashtable(void *hash, unsigned int size); |
ac565e5f | 185 | |
4e77be46 | 186 | struct nf_conntrack_tuple_hash * |
5d0aa2cc PM |
187 | __nf_conntrack_find(struct net *net, u16 zone, |
188 | const struct nf_conntrack_tuple *tuple); | |
c1d10adb | 189 | |
4e77be46 | 190 | int nf_conntrack_hash_check_insert(struct nf_conn *ct); |
02982c27 | 191 | bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report); |
c1d10adb | 192 | |
4e77be46 JP |
193 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
194 | u_int16_t l3num, struct nf_conntrack_tuple *tuple); | |
195 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, | |
196 | const struct nf_conntrack_tuple *orig); | |
9fb9cbb1 | 197 | |
4e77be46 JP |
198 | void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
199 | const struct sk_buff *skb, | |
200 | unsigned long extra_jiffies, int do_acct); | |
9fb9cbb1 YK |
201 | |
202 | /* Refresh conntrack for this many jiffies and do accounting */ | |
203 | static inline void nf_ct_refresh_acct(struct nf_conn *ct, | |
204 | enum ip_conntrack_info ctinfo, | |
205 | const struct sk_buff *skb, | |
206 | unsigned long extra_jiffies) | |
207 | { | |
208 | __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); | |
209 | } | |
210 | ||
211 | /* Refresh conntrack for this many jiffies */ | |
212 | static inline void nf_ct_refresh(struct nf_conn *ct, | |
213 | const struct sk_buff *skb, | |
214 | unsigned long extra_jiffies) | |
215 | { | |
216 | __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); | |
217 | } | |
218 | ||
4e77be46 JP |
219 | bool __nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
220 | const struct sk_buff *skb, int do_acct); | |
718d4ad9 FH |
221 | |
222 | /* kill conntrack and do accounting */ | |
4c889498 DM |
223 | static inline bool nf_ct_kill_acct(struct nf_conn *ct, |
224 | enum ip_conntrack_info ctinfo, | |
225 | const struct sk_buff *skb) | |
718d4ad9 | 226 | { |
4c889498 | 227 | return __nf_ct_kill_acct(ct, ctinfo, skb, 1); |
718d4ad9 FH |
228 | } |
229 | ||
230 | /* kill conntrack without accounting */ | |
4c889498 | 231 | static inline bool nf_ct_kill(struct nf_conn *ct) |
718d4ad9 | 232 | { |
4c889498 | 233 | return __nf_ct_kill_acct(ct, 0, NULL, 0); |
718d4ad9 | 234 | } |
51091764 | 235 | |
9fb9cbb1 | 236 | /* These are for NAT. Icky. */ |
2d89c68a | 237 | extern s32 (*nf_ct_nat_offset)(const struct nf_conn *ct, |
f9dd09c7 JK |
238 | enum ip_conntrack_dir dir, |
239 | u32 seq); | |
9fb9cbb1 | 240 | |
9fb9cbb1 | 241 | /* Fake conntrack entry for untracked connections */ |
b3c5163f | 242 | DECLARE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
5bfddbd4 ED |
243 | static inline struct nf_conn *nf_ct_untracked_get(void) |
244 | { | |
903ceff7 | 245 | return raw_cpu_ptr(&nf_conntrack_untracked); |
5bfddbd4 | 246 | } |
4e77be46 | 247 | void nf_ct_untracked_status_or(unsigned long bits); |
9fb9cbb1 | 248 | |
9fb9cbb1 | 249 | /* Iterate over all conntracks: if iter returns true, it's deleted. */ |
4e77be46 JP |
250 | void nf_ct_iterate_cleanup(struct net *net, |
251 | int (*iter)(struct nf_conn *i, void *data), | |
252 | void *data, u32 portid, int report); | |
308ac914 DB |
253 | |
254 | struct nf_conntrack_zone; | |
255 | ||
4e77be46 | 256 | void nf_conntrack_free(struct nf_conn *ct); |
308ac914 DB |
257 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
258 | const struct nf_conntrack_zone *zone, | |
4e77be46 JP |
259 | const struct nf_conntrack_tuple *orig, |
260 | const struct nf_conntrack_tuple *repl, | |
261 | gfp_t gfp); | |
9fb9cbb1 | 262 | |
b2a15a60 PM |
263 | static inline int nf_ct_is_template(const struct nf_conn *ct) |
264 | { | |
265 | return test_bit(IPS_TEMPLATE_BIT, &ct->status); | |
266 | } | |
267 | ||
9fb9cbb1 YK |
268 | /* It's confirmed if it is, or has been in the hash table. */ |
269 | static inline int nf_ct_is_confirmed(struct nf_conn *ct) | |
270 | { | |
271 | return test_bit(IPS_CONFIRMED_BIT, &ct->status); | |
272 | } | |
273 | ||
274 | static inline int nf_ct_is_dying(struct nf_conn *ct) | |
275 | { | |
276 | return test_bit(IPS_DYING_BIT, &ct->status); | |
277 | } | |
278 | ||
5bfddbd4 | 279 | static inline int nf_ct_is_untracked(const struct nf_conn *ct) |
587aa641 | 280 | { |
5bfddbd4 | 281 | return test_bit(IPS_UNTRACKED_BIT, &ct->status); |
587aa641 PM |
282 | } |
283 | ||
42c1edd3 JA |
284 | /* Packet is received from loopback */ |
285 | static inline bool nf_is_loopback_packet(const struct sk_buff *skb) | |
286 | { | |
287 | return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK; | |
288 | } | |
289 | ||
34641c6d PG |
290 | struct kernel_param; |
291 | ||
4e77be46 | 292 | int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); |
9fb9cbb1 | 293 | extern unsigned int nf_conntrack_htable_size; |
e478075c | 294 | extern unsigned int nf_conntrack_max; |
f682cefa CG |
295 | extern unsigned int nf_conntrack_hash_rnd; |
296 | void init_nf_conntrack_hash_rnd(void); | |
9fb9cbb1 | 297 | |
308ac914 DB |
298 | struct nf_conn *nf_ct_tmpl_alloc(struct net *net, |
299 | const struct nf_conntrack_zone *zone, | |
300 | gfp_t flags); | |
9cf94eab | 301 | void nf_ct_tmpl_free(struct nf_conn *tmpl); |
e53376be | 302 | |
ac3a546a ED |
303 | #define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count) |
304 | #define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count) | |
9fb9cbb1 | 305 | |
4dc06f96 PNA |
306 | #define MODULE_ALIAS_NFCT_HELPER(helper) \ |
307 | MODULE_ALIAS("nfct-helper-" helper) | |
308 | ||
9fb9cbb1 | 309 | #endif /* _NF_CONNTRACK_H */ |