19fb9cbb1SYasuyuki Kozakai /* 29fb9cbb1SYasuyuki Kozakai * Connection state tracking for netfilter. This is separated from, 39fb9cbb1SYasuyuki Kozakai * but required by, the (future) NAT layer; it can also be used by an iptables 49fb9cbb1SYasuyuki Kozakai * extension. 59fb9cbb1SYasuyuki Kozakai * 69fb9cbb1SYasuyuki Kozakai * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> 79fb9cbb1SYasuyuki Kozakai * - generalize L3 protocol dependent part. 89fb9cbb1SYasuyuki Kozakai * 99fb9cbb1SYasuyuki Kozakai * Derived from include/linux/netfiter_ipv4/ip_conntrack.h 109fb9cbb1SYasuyuki Kozakai */ 119fb9cbb1SYasuyuki Kozakai 129fb9cbb1SYasuyuki Kozakai #ifndef _NF_CONNTRACK_H 139fb9cbb1SYasuyuki Kozakai #define _NF_CONNTRACK_H 149fb9cbb1SYasuyuki Kozakai 159fb9cbb1SYasuyuki Kozakai #include <linux/netfilter/nf_conntrack_common.h> 169fb9cbb1SYasuyuki Kozakai 179fb9cbb1SYasuyuki Kozakai #ifdef __KERNEL__ 189fb9cbb1SYasuyuki Kozakai #include <linux/bitops.h> 199fb9cbb1SYasuyuki Kozakai #include <linux/compiler.h> 209fb9cbb1SYasuyuki Kozakai #include <asm/atomic.h> 219fb9cbb1SYasuyuki Kozakai 229fb9cbb1SYasuyuki Kozakai #include <linux/netfilter/nf_conntrack_tcp.h> 239fb9cbb1SYasuyuki Kozakai #include <linux/netfilter/nf_conntrack_sctp.h> 24f09943feSPatrick McHardy #include <linux/netfilter/nf_conntrack_proto_gre.h> 259fb9cbb1SYasuyuki Kozakai #include <net/netfilter/ipv4/nf_conntrack_icmp.h> 269fb9cbb1SYasuyuki Kozakai #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> 279fb9cbb1SYasuyuki Kozakai 289fb9cbb1SYasuyuki Kozakai #include <net/netfilter/nf_conntrack_tuple.h> 299fb9cbb1SYasuyuki Kozakai 309fb9cbb1SYasuyuki Kozakai /* per conntrack: protocol private data */ 319fb9cbb1SYasuyuki Kozakai union nf_conntrack_proto { 329fb9cbb1SYasuyuki Kozakai /* insert conntrack proto private data here */ 339fb9cbb1SYasuyuki Kozakai struct ip_ct_sctp sctp; 349fb9cbb1SYasuyuki Kozakai struct ip_ct_tcp tcp; 359fb9cbb1SYasuyuki Kozakai struct ip_ct_icmp icmp; 369fb9cbb1SYasuyuki Kozakai struct nf_ct_icmpv6 icmpv6; 37f09943feSPatrick McHardy struct nf_ct_gre gre; 389fb9cbb1SYasuyuki Kozakai }; 399fb9cbb1SYasuyuki Kozakai 409fb9cbb1SYasuyuki Kozakai union nf_conntrack_expect_proto { 419fb9cbb1SYasuyuki Kozakai /* insert expect proto private data here */ 429fb9cbb1SYasuyuki Kozakai }; 439fb9cbb1SYasuyuki Kozakai 449fb9cbb1SYasuyuki Kozakai /* Add protocol helper include file here */ 459fb9cbb1SYasuyuki Kozakai #include <linux/netfilter/nf_conntrack_ftp.h> 46f09943feSPatrick McHardy #include <linux/netfilter/nf_conntrack_pptp.h> 47f587de0eSPatrick McHardy #include <linux/netfilter/nf_conntrack_h323.h> 486fecd198SMichal Schmidt #include <linux/netfilter/nf_conntrack_sane.h> 499fb9cbb1SYasuyuki Kozakai 509fb9cbb1SYasuyuki Kozakai /* per conntrack: application helper private data */ 519fb9cbb1SYasuyuki Kozakai union nf_conntrack_help { 529fb9cbb1SYasuyuki Kozakai /* insert conntrack helper private data (master) here */ 5355a73324SJozsef Kadlecsik struct nf_ct_ftp_master ct_ftp_info; 54f09943feSPatrick McHardy struct nf_ct_pptp_master ct_pptp_info; 55f587de0eSPatrick McHardy struct nf_ct_h323_master ct_h323_info; 566fecd198SMichal Schmidt struct nf_ct_sane_master ct_sane_info; 579fb9cbb1SYasuyuki Kozakai }; 589fb9cbb1SYasuyuki Kozakai 599fb9cbb1SYasuyuki Kozakai #include <linux/types.h> 609fb9cbb1SYasuyuki Kozakai #include <linux/skbuff.h> 61d7fe0f24SAl Viro #include <linux/timer.h> 629fb9cbb1SYasuyuki Kozakai 639fb9cbb1SYasuyuki Kozakai #ifdef CONFIG_NETFILTER_DEBUG 649fb9cbb1SYasuyuki Kozakai #define NF_CT_ASSERT(x) \ 659fb9cbb1SYasuyuki Kozakai do { \ 669fb9cbb1SYasuyuki Kozakai if (!(x)) \ 679fb9cbb1SYasuyuki Kozakai /* Wooah! I'm tripping my conntrack in a frenzy of \ 689fb9cbb1SYasuyuki Kozakai netplay... */ \ 699fb9cbb1SYasuyuki Kozakai printk("NF_CT_ASSERT: %s:%i(%s)\n", \ 709fb9cbb1SYasuyuki Kozakai __FILE__, __LINE__, __FUNCTION__); \ 719fb9cbb1SYasuyuki Kozakai } while(0) 729fb9cbb1SYasuyuki Kozakai #else 739fb9cbb1SYasuyuki Kozakai #define NF_CT_ASSERT(x) 749fb9cbb1SYasuyuki Kozakai #endif 759fb9cbb1SYasuyuki Kozakai 769fb9cbb1SYasuyuki Kozakai struct nf_conntrack_helper; 779fb9cbb1SYasuyuki Kozakai 78dc808fe2SHarald Welte /* nf_conn feature for connections that have a helper */ 79dc808fe2SHarald Welte struct nf_conn_help { 80dc808fe2SHarald Welte /* Helper. if any */ 81dc808fe2SHarald Welte struct nf_conntrack_helper *helper; 82dc808fe2SHarald Welte 83dc808fe2SHarald Welte union nf_conntrack_help help; 84dc808fe2SHarald Welte 85b560580aSPatrick McHardy struct hlist_head expectations; 86b560580aSPatrick McHardy 87dc808fe2SHarald Welte /* Current number of expected connections */ 88dc808fe2SHarald Welte unsigned int expecting; 89dc808fe2SHarald Welte }; 90dc808fe2SHarald Welte 91dc808fe2SHarald Welte 929fb9cbb1SYasuyuki Kozakai #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> 93f8eb24a8SPatrick McHardy #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> 94f8eb24a8SPatrick McHardy 959fb9cbb1SYasuyuki Kozakai struct nf_conn 969fb9cbb1SYasuyuki Kozakai { 979fb9cbb1SYasuyuki Kozakai /* Usage count in here is 1 for hash table/destruct timer, 1 per skb, 989fb9cbb1SYasuyuki Kozakai plus 1 for any connection(s) we are `master' for */ 999fb9cbb1SYasuyuki Kozakai struct nf_conntrack ct_general; 1009fb9cbb1SYasuyuki Kozakai 1019fb9cbb1SYasuyuki Kozakai /* XXX should I move this to the tail ? - Y.K */ 1029fb9cbb1SYasuyuki Kozakai /* These are my tuples; original and reply */ 1039fb9cbb1SYasuyuki Kozakai struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; 1049fb9cbb1SYasuyuki Kozakai 1059fb9cbb1SYasuyuki Kozakai /* Have we seen traffic both ways yet? (bitset) */ 1069fb9cbb1SYasuyuki Kozakai unsigned long status; 1079fb9cbb1SYasuyuki Kozakai 108dc808fe2SHarald Welte /* If we were expected by an expectation, this will be it */ 109dc808fe2SHarald Welte struct nf_conn *master; 110dc808fe2SHarald Welte 1119fb9cbb1SYasuyuki Kozakai /* Timer function; drops refcnt when it goes off. */ 1129fb9cbb1SYasuyuki Kozakai struct timer_list timeout; 1139fb9cbb1SYasuyuki Kozakai 1149fb9cbb1SYasuyuki Kozakai #ifdef CONFIG_NF_CT_ACCT 1159fb9cbb1SYasuyuki Kozakai /* Accounting Information (same cache line as other written members) */ 1169fb9cbb1SYasuyuki Kozakai struct ip_conntrack_counter counters[IP_CT_DIR_MAX]; 1179fb9cbb1SYasuyuki Kozakai #endif 1189fb9cbb1SYasuyuki Kozakai 1199fb9cbb1SYasuyuki Kozakai #if defined(CONFIG_NF_CONNTRACK_MARK) 1209fb9cbb1SYasuyuki Kozakai u_int32_t mark; 1219fb9cbb1SYasuyuki Kozakai #endif 1229fb9cbb1SYasuyuki Kozakai 1237c9728c3SJames Morris #ifdef CONFIG_NF_CONNTRACK_SECMARK 1247c9728c3SJames Morris u_int32_t secmark; 1257c9728c3SJames Morris #endif 1267c9728c3SJames Morris 127dc808fe2SHarald Welte /* Storage reserved for other modules: */ 128dc808fe2SHarald Welte union nf_conntrack_proto proto; 1299fb9cbb1SYasuyuki Kozakai 130ecfab2c9SYasuyuki Kozakai /* Extensions */ 131ecfab2c9SYasuyuki Kozakai struct nf_ct_ext *ext; 13276507f69SPatrick McHardy 13376507f69SPatrick McHardy struct rcu_head rcu; 1349fb9cbb1SYasuyuki Kozakai }; 1359fb9cbb1SYasuyuki Kozakai 1369fb9cbb1SYasuyuki Kozakai static inline struct nf_conn * 1379fb9cbb1SYasuyuki Kozakai nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) 1389fb9cbb1SYasuyuki Kozakai { 1399fb9cbb1SYasuyuki Kozakai return container_of(hash, struct nf_conn, 1409fb9cbb1SYasuyuki Kozakai tuplehash[hash->tuple.dst.dir]); 1419fb9cbb1SYasuyuki Kozakai } 1429fb9cbb1SYasuyuki Kozakai 1439fb9cbb1SYasuyuki Kozakai /* get master conntrack via master expectation */ 1449fb9cbb1SYasuyuki Kozakai #define master_ct(conntr) (conntr->master) 1459fb9cbb1SYasuyuki Kozakai 1469fb9cbb1SYasuyuki Kozakai /* Alter reply tuple (maybe alter helper). */ 1479fb9cbb1SYasuyuki Kozakai extern void 148c88130bcSPatrick McHardy nf_conntrack_alter_reply(struct nf_conn *ct, 1499fb9cbb1SYasuyuki Kozakai const struct nf_conntrack_tuple *newreply); 1509fb9cbb1SYasuyuki Kozakai 1519fb9cbb1SYasuyuki Kozakai /* Is this tuple taken? (ignoring any belonging to the given 1529fb9cbb1SYasuyuki Kozakai conntrack). */ 1539fb9cbb1SYasuyuki Kozakai extern int 1549fb9cbb1SYasuyuki Kozakai nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, 1559fb9cbb1SYasuyuki Kozakai const struct nf_conn *ignored_conntrack); 1569fb9cbb1SYasuyuki Kozakai 1579fb9cbb1SYasuyuki Kozakai /* Return conntrack_info and tuple hash for given skb. */ 1589fb9cbb1SYasuyuki Kozakai static inline struct nf_conn * 1599fb9cbb1SYasuyuki Kozakai nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) 1609fb9cbb1SYasuyuki Kozakai { 1619fb9cbb1SYasuyuki Kozakai *ctinfo = skb->nfctinfo; 1629fb9cbb1SYasuyuki Kozakai return (struct nf_conn *)skb->nfct; 1639fb9cbb1SYasuyuki Kozakai } 1649fb9cbb1SYasuyuki Kozakai 1659fb9cbb1SYasuyuki Kozakai /* decrement reference count on a conntrack */ 1669fb9cbb1SYasuyuki Kozakai static inline void nf_ct_put(struct nf_conn *ct) 1679fb9cbb1SYasuyuki Kozakai { 1689fb9cbb1SYasuyuki Kozakai NF_CT_ASSERT(ct); 1699fb9cbb1SYasuyuki Kozakai nf_conntrack_put(&ct->ct_general); 1709fb9cbb1SYasuyuki Kozakai } 1719fb9cbb1SYasuyuki Kozakai 172b9f78f9fSPablo Neira Ayuso /* Protocol module loading */ 173b9f78f9fSPablo Neira Ayuso extern int nf_ct_l3proto_try_module_get(unsigned short l3proto); 174b9f78f9fSPablo Neira Ayuso extern void nf_ct_l3proto_module_put(unsigned short l3proto); 175b9f78f9fSPablo Neira Ayuso 17696eb24d7SStephen Hemminger extern struct hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced); 177ac565e5fSPatrick McHardy extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, 17896eb24d7SStephen Hemminger unsigned int size); 179ac565e5fSPatrick McHardy 180c1d10adbSPablo Neira Ayuso extern struct nf_conntrack_tuple_hash * 181ba419affSPatrick McHardy __nf_conntrack_find(const struct nf_conntrack_tuple *tuple); 182c1d10adbSPablo Neira Ayuso 183c1d10adbSPablo Neira Ayuso extern void nf_conntrack_hash_insert(struct nf_conn *ct); 184c1d10adbSPablo Neira Ayuso 185c1d10adbSPablo Neira Ayuso extern void nf_conntrack_flush(void); 186c1d10adbSPablo Neira Ayuso 187e2a3123fSYasuyuki Kozakai extern int nf_ct_get_tuplepr(const struct sk_buff *skb, 188e2a3123fSYasuyuki Kozakai unsigned int nhoff, 189e2a3123fSYasuyuki Kozakai u_int16_t l3num, 190e2a3123fSYasuyuki Kozakai struct nf_conntrack_tuple *tuple); 1919fb9cbb1SYasuyuki Kozakai extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, 1929fb9cbb1SYasuyuki Kozakai const struct nf_conntrack_tuple *orig); 1939fb9cbb1SYasuyuki Kozakai 1949fb9cbb1SYasuyuki Kozakai extern void __nf_ct_refresh_acct(struct nf_conn *ct, 1959fb9cbb1SYasuyuki Kozakai enum ip_conntrack_info ctinfo, 1969fb9cbb1SYasuyuki Kozakai const struct sk_buff *skb, 1979fb9cbb1SYasuyuki Kozakai unsigned long extra_jiffies, 1989fb9cbb1SYasuyuki Kozakai int do_acct); 1999fb9cbb1SYasuyuki Kozakai 2009fb9cbb1SYasuyuki Kozakai /* Refresh conntrack for this many jiffies and do accounting */ 2019fb9cbb1SYasuyuki Kozakai static inline void nf_ct_refresh_acct(struct nf_conn *ct, 2029fb9cbb1SYasuyuki Kozakai enum ip_conntrack_info ctinfo, 2039fb9cbb1SYasuyuki Kozakai const struct sk_buff *skb, 2049fb9cbb1SYasuyuki Kozakai unsigned long extra_jiffies) 2059fb9cbb1SYasuyuki Kozakai { 2069fb9cbb1SYasuyuki Kozakai __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); 2079fb9cbb1SYasuyuki Kozakai } 2089fb9cbb1SYasuyuki Kozakai 2099fb9cbb1SYasuyuki Kozakai /* Refresh conntrack for this many jiffies */ 2109fb9cbb1SYasuyuki Kozakai static inline void nf_ct_refresh(struct nf_conn *ct, 2119fb9cbb1SYasuyuki Kozakai const struct sk_buff *skb, 2129fb9cbb1SYasuyuki Kozakai unsigned long extra_jiffies) 2139fb9cbb1SYasuyuki Kozakai { 2149fb9cbb1SYasuyuki Kozakai __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); 2159fb9cbb1SYasuyuki Kozakai } 2169fb9cbb1SYasuyuki Kozakai 2179fb9cbb1SYasuyuki Kozakai /* These are for NAT. Icky. */ 2189fb9cbb1SYasuyuki Kozakai /* Update TCP window tracking data when NAT mangles the packet */ 2199fb9cbb1SYasuyuki Kozakai extern void nf_conntrack_tcp_update(struct sk_buff *skb, 2209fb9cbb1SYasuyuki Kozakai unsigned int dataoff, 221c88130bcSPatrick McHardy struct nf_conn *ct, 2229fb9cbb1SYasuyuki Kozakai int dir); 2239fb9cbb1SYasuyuki Kozakai 2249fb9cbb1SYasuyuki Kozakai /* Fake conntrack entry for untracked connections */ 2259fb9cbb1SYasuyuki Kozakai extern struct nf_conn nf_conntrack_untracked; 2269fb9cbb1SYasuyuki Kozakai 2279fb9cbb1SYasuyuki Kozakai /* Iterate over all conntracks: if iter returns true, it's deleted. */ 2289fb9cbb1SYasuyuki Kozakai extern void 2299fb9cbb1SYasuyuki Kozakai nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data); 2309fb9cbb1SYasuyuki Kozakai extern void nf_conntrack_free(struct nf_conn *ct); 2319fb9cbb1SYasuyuki Kozakai extern struct nf_conn * 2329fb9cbb1SYasuyuki Kozakai nf_conntrack_alloc(const struct nf_conntrack_tuple *orig, 2339fb9cbb1SYasuyuki Kozakai const struct nf_conntrack_tuple *repl); 2349fb9cbb1SYasuyuki Kozakai 2359fb9cbb1SYasuyuki Kozakai /* It's confirmed if it is, or has been in the hash table. */ 2369fb9cbb1SYasuyuki Kozakai static inline int nf_ct_is_confirmed(struct nf_conn *ct) 2379fb9cbb1SYasuyuki Kozakai { 2389fb9cbb1SYasuyuki Kozakai return test_bit(IPS_CONFIRMED_BIT, &ct->status); 2399fb9cbb1SYasuyuki Kozakai } 2409fb9cbb1SYasuyuki Kozakai 2419fb9cbb1SYasuyuki Kozakai static inline int nf_ct_is_dying(struct nf_conn *ct) 2429fb9cbb1SYasuyuki Kozakai { 2439fb9cbb1SYasuyuki Kozakai return test_bit(IPS_DYING_BIT, &ct->status); 2449fb9cbb1SYasuyuki Kozakai } 2459fb9cbb1SYasuyuki Kozakai 246587aa641SPatrick McHardy static inline int nf_ct_is_untracked(const struct sk_buff *skb) 247587aa641SPatrick McHardy { 248587aa641SPatrick McHardy return (skb->nfct == &nf_conntrack_untracked.ct_general); 249587aa641SPatrick McHardy } 250587aa641SPatrick McHardy 251fae718ddSPatrick McHardy extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); 2529fb9cbb1SYasuyuki Kozakai extern unsigned int nf_conntrack_htable_size; 25339a27a35SPatrick McHardy extern int nf_conntrack_checksum; 254f8eb24a8SPatrick McHardy extern atomic_t nf_conntrack_count; 255f8eb24a8SPatrick McHardy extern int nf_conntrack_max; 2569fb9cbb1SYasuyuki Kozakai 257f8eb24a8SPatrick McHardy DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat); 2589fb9cbb1SYasuyuki Kozakai #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) 259c0e912d7SPatrick McHardy #define NF_CT_STAT_INC_ATOMIC(count) \ 260c0e912d7SPatrick McHardy do { \ 261c0e912d7SPatrick McHardy local_bh_disable(); \ 262c0e912d7SPatrick McHardy __get_cpu_var(nf_conntrack_stat).count++; \ 263c0e912d7SPatrick McHardy local_bh_enable(); \ 264c0e912d7SPatrick McHardy } while (0) 2659fb9cbb1SYasuyuki Kozakai 2669fb9cbb1SYasuyuki Kozakai #endif /* __KERNEL__ */ 2679fb9cbb1SYasuyuki Kozakai #endif /* _NF_CONNTRACK_H */ 268