Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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__ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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> |
Patrick McHardy | f09943f | 2006-12-02 22:09:41 -0800 | [diff] [blame] | 24 | #include <linux/netfilter/nf_conntrack_proto_gre.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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; |
Patrick McHardy | f09943f | 2006-12-02 22:09:41 -0800 | [diff] [blame] | 37 | struct nf_ct_gre gre; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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> |
Patrick McHardy | f09943f | 2006-12-02 22:09:41 -0800 | [diff] [blame] | 46 | #include <linux/netfilter/nf_conntrack_pptp.h> |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 47 | #include <linux/netfilter/nf_conntrack_h323.h> |
Michal Schmidt | 6fecd19 | 2007-02-07 15:05:12 -0800 | [diff] [blame] | 48 | #include <linux/netfilter/nf_conntrack_sane.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 49 | |
| 50 | /* per conntrack: application helper private data */ |
| 51 | union nf_conntrack_help { |
| 52 | /* insert conntrack helper private data (master) here */ |
Jozsef Kadlecsik | 55a7332 | 2006-12-02 22:07:44 -0800 | [diff] [blame] | 53 | struct nf_ct_ftp_master ct_ftp_info; |
Patrick McHardy | f09943f | 2006-12-02 22:09:41 -0800 | [diff] [blame] | 54 | struct nf_ct_pptp_master ct_pptp_info; |
Patrick McHardy | f587de0 | 2006-12-02 22:08:46 -0800 | [diff] [blame] | 55 | struct nf_ct_h323_master ct_h323_info; |
Michal Schmidt | 6fecd19 | 2007-02-07 15:05:12 -0800 | [diff] [blame] | 56 | struct nf_ct_sane_master ct_sane_info; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 57 | }; |
| 58 | |
| 59 | #include <linux/types.h> |
| 60 | #include <linux/skbuff.h> |
Al Viro | d7fe0f2 | 2006-12-03 23:15:30 -0500 | [diff] [blame] | 61 | #include <linux/timer.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 78 | /* Must be kept in sync with the classes defined by helpers */ |
| 79 | #define NF_CT_MAX_EXPECT_CLASSES 1 |
| 80 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 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 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 88 | struct hlist_head expectations; |
| 89 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 90 | /* Current number of expected connections */ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame^] | 91 | u8 expecting[NF_CT_MAX_EXPECT_CLASSES]; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 92 | }; |
| 93 | |
| 94 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 95 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
Patrick McHardy | f8eb24a | 2006-11-29 02:35:15 +0100 | [diff] [blame] | 96 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
| 97 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 111 | /* If we were expected by an expectation, this will be it */ |
| 112 | struct nf_conn *master; |
| 113 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 121 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 122 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
| 123 | u_int32_t mark; |
| 124 | #endif |
| 125 | |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 126 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
| 127 | u_int32_t secmark; |
| 128 | #endif |
| 129 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 130 | /* Storage reserved for other modules: */ |
| 131 | union nf_conntrack_proto proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 132 | |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 133 | /* Extensions */ |
| 134 | struct nf_ct_ext *ext; |
Patrick McHardy | 76507f6 | 2008-01-31 04:38:38 -0800 | [diff] [blame] | 135 | |
| 136 | struct rcu_head rcu; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 137 | }; |
| 138 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 151 | nf_conntrack_alter_reply(struct nf_conn *ct, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 | |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 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 | |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 179 | extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced); |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 180 | extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, |
Stephen Hemminger | 96eb24d | 2008-01-31 04:07:29 -0800 | [diff] [blame] | 181 | unsigned int size); |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 182 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 183 | extern struct nf_conntrack_tuple_hash * |
Patrick McHardy | ba419af | 2008-01-31 04:39:23 -0800 | [diff] [blame] | 184 | __nf_conntrack_find(const struct nf_conntrack_tuple *tuple); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 185 | |
| 186 | extern void nf_conntrack_hash_insert(struct nf_conn *ct); |
| 187 | |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 188 | extern void nf_conntrack_flush(void); |
| 189 | |
Yasuyuki Kozakai | e2a3123 | 2007-07-14 20:45:14 -0700 | [diff] [blame] | 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); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 */ |
Jan Engelhardt | 82f568f | 2008-01-31 04:52:07 -0800 | [diff] [blame] | 222 | extern void nf_conntrack_tcp_update(const struct sk_buff *skb, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 223 | unsigned int dataoff, |
Patrick McHardy | c88130b | 2008-01-31 04:42:11 -0800 | [diff] [blame] | 224 | struct nf_conn *ct, |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 225 | int dir); |
| 226 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 227 | /* Fake conntrack entry for untracked connections */ |
| 228 | extern struct nf_conn nf_conntrack_untracked; |
| 229 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 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 | |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 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 | |
Patrick McHardy | fae718d | 2007-12-24 21:09:10 -0800 | [diff] [blame] | 254 | extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 255 | extern unsigned int nf_conntrack_htable_size; |
Patrick McHardy | 39a27a3 | 2006-05-29 18:23:54 -0700 | [diff] [blame] | 256 | extern int nf_conntrack_checksum; |
Patrick McHardy | f8eb24a | 2006-11-29 02:35:15 +0100 | [diff] [blame] | 257 | extern atomic_t nf_conntrack_count; |
| 258 | extern int nf_conntrack_max; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 259 | |
Patrick McHardy | f8eb24a | 2006-11-29 02:35:15 +0100 | [diff] [blame] | 260 | DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 261 | #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) |
Patrick McHardy | c0e912d | 2007-02-12 11:13:43 -0800 | [diff] [blame] | 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) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 268 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 269 | #endif /* __KERNEL__ */ |
| 270 | #endif /* _NF_CONNTRACK_H */ |