diff options
Diffstat (limited to 'include/net/netfilter/nf_conntrack.h')
-rw-r--r-- | include/net/netfilter/nf_conntrack.h | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h new file mode 100644 index 0000000..cc48256 --- /dev/null +++ b/include/net/netfilter/nf_conntrack.h @@ -0,0 +1,354 @@ +/* + * Connection state tracking for netfilter. This is separated from, + * but required by, the (future) NAT layer; it can also be used by an iptables + * extension. + * + * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> + * - generalize L3 protocol dependent part. + * + * Derived from include/linux/netfiter_ipv4/ip_conntrack.h + */ + +#ifndef _NF_CONNTRACK_H +#define _NF_CONNTRACK_H + +#include <linux/netfilter/nf_conntrack_common.h> + +#ifdef __KERNEL__ +#include <linux/config.h> +#include <linux/bitops.h> +#include <linux/compiler.h> +#include <asm/atomic.h> + +#include <linux/netfilter/nf_conntrack_tcp.h> +#include <linux/netfilter/nf_conntrack_sctp.h> +#include <net/netfilter/ipv4/nf_conntrack_icmp.h> +#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> + +#include <net/netfilter/nf_conntrack_tuple.h> + +/* per conntrack: protocol private data */ +union nf_conntrack_proto { + /* insert conntrack proto private data here */ + struct ip_ct_sctp sctp; + struct ip_ct_tcp tcp; + struct ip_ct_icmp icmp; + struct nf_ct_icmpv6 icmpv6; +}; + +union nf_conntrack_expect_proto { + /* insert expect proto private data here */ +}; + +/* Add protocol helper include file here */ +#include <linux/netfilter/nf_conntrack_ftp.h> + +/* per conntrack: application helper private data */ +union nf_conntrack_help { + /* insert conntrack helper private data (master) here */ + struct ip_ct_ftp_master ct_ftp_info; +}; + +#include <linux/types.h> +#include <linux/skbuff.h> + +#ifdef CONFIG_NETFILTER_DEBUG +#define NF_CT_ASSERT(x) \ +do { \ + if (!(x)) \ + /* Wooah! I'm tripping my conntrack in a frenzy of \ + netplay... */ \ + printk("NF_CT_ASSERT: %s:%i(%s)\n", \ + __FILE__, __LINE__, __FUNCTION__); \ +} while(0) +#else +#define NF_CT_ASSERT(x) +#endif + +struct nf_conntrack_helper; + +#include <net/netfilter/ipv4/nf_conntrack_ipv4.h> +struct nf_conn +{ + /* Usage count in here is 1 for hash table/destruct timer, 1 per skb, + plus 1 for any connection(s) we are `master' for */ + struct nf_conntrack ct_general; + + /* XXX should I move this to the tail ? - Y.K */ + /* These are my tuples; original and reply */ + struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; + + /* Have we seen traffic both ways yet? (bitset) */ + unsigned long status; + + /* Timer function; drops refcnt when it goes off. */ + struct timer_list timeout; + +#ifdef CONFIG_NF_CT_ACCT + /* Accounting Information (same cache line as other written members) */ + struct ip_conntrack_counter counters[IP_CT_DIR_MAX]; +#endif + /* If we were expected by an expectation, this will be it */ + struct nf_conn *master; + + /* Current number of expected connections */ + unsigned int expecting; + + /* Helper. if any */ + struct nf_conntrack_helper *helper; + + /* features - nat, helper, ... used by allocating system */ + u_int32_t features; + + /* Storage reserved for other modules: */ + + union nf_conntrack_proto proto; + +#if defined(CONFIG_NF_CONNTRACK_MARK) + u_int32_t mark; +#endif + + /* These members are dynamically allocated. */ + + union nf_conntrack_help *help; + + /* Layer 3 dependent members. (ex: NAT) */ + union { + struct nf_conntrack_ipv4 *ipv4; + } l3proto; + void *data[0]; +}; + +struct nf_conntrack_expect +{ + /* Internal linked list (global expectation list) */ + struct list_head list; + + /* We expect this tuple, with the following mask */ + struct nf_conntrack_tuple tuple, mask; + + /* Function to call after setup and insertion */ + void (*expectfn)(struct nf_conn *new, + struct nf_conntrack_expect *this); + + /* The conntrack of the master connection */ + struct nf_conn *master; + + /* Timer function; deletes the expectation. */ + struct timer_list timeout; + + /* Usage count. */ + atomic_t use; + + /* Flags */ + unsigned int flags; + +#ifdef CONFIG_NF_NAT_NEEDED + /* This is the original per-proto part, used to map the + * expected connection the way the recipient expects. */ + union nf_conntrack_manip_proto saved_proto; + /* Direction relative to the master connection. */ + enum ip_conntrack_dir dir; +#endif +}; + +#define NF_CT_EXPECT_PERMANENT 0x1 + +static inline struct nf_conn * +nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) +{ + return container_of(hash, struct nf_conn, + tuplehash[hash->tuple.dst.dir]); +} + +/* get master conntrack via master expectation */ +#define master_ct(conntr) (conntr->master) + +/* Alter reply tuple (maybe alter helper). */ +extern void +nf_conntrack_alter_reply(struct nf_conn *conntrack, + const struct nf_conntrack_tuple *newreply); + +/* Is this tuple taken? (ignoring any belonging to the given + conntrack). */ +extern int +nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, + const struct nf_conn *ignored_conntrack); + +/* Return conntrack_info and tuple hash for given skb. */ +static inline struct nf_conn * +nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) +{ + *ctinfo = skb->nfctinfo; + return (struct nf_conn *)skb->nfct; +} + +/* decrement reference count on a conntrack */ +static inline void nf_ct_put(struct nf_conn *ct) +{ + NF_CT_ASSERT(ct); + nf_conntrack_put(&ct->ct_general); +} + +/* call to create an explicit dependency on nf_conntrack. */ +extern void need_nf_conntrack(void); + +extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, + const struct nf_conntrack_tuple *orig); + +extern void __nf_ct_refresh_acct(struct nf_conn *ct, + enum ip_conntrack_info ctinfo, + const struct sk_buff *skb, + unsigned long extra_jiffies, + int do_acct); + +/* Refresh conntrack for this many jiffies and do accounting */ +static inline void nf_ct_refresh_acct(struct nf_conn *ct, + enum ip_conntrack_info ctinfo, + const struct sk_buff *skb, + unsigned long extra_jiffies) +{ + __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); +} + +/* Refresh conntrack for this many jiffies */ +static inline void nf_ct_refresh(struct nf_conn *ct, + const struct sk_buff *skb, + unsigned long extra_jiffies) +{ + __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); +} + +/* These are for NAT. Icky. */ +/* Update TCP window tracking data when NAT mangles the packet */ +extern void nf_conntrack_tcp_update(struct sk_buff *skb, + unsigned int dataoff, + struct nf_conn *conntrack, + int dir); + +/* Call me when a conntrack is destroyed. */ +extern void (*nf_conntrack_destroyed)(struct nf_conn *conntrack); + +/* Fake conntrack entry for untracked connections */ +extern struct nf_conn nf_conntrack_untracked; + +extern int nf_ct_no_defrag; + +/* Iterate over all conntracks: if iter returns true, it's deleted. */ +extern void +nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data); +extern void nf_conntrack_free(struct nf_conn *ct); +extern struct nf_conn * +nf_conntrack_alloc(const struct nf_conntrack_tuple *orig, + const struct nf_conntrack_tuple *repl); + +/* It's confirmed if it is, or has been in the hash table. */ +static inline int nf_ct_is_confirmed(struct nf_conn *ct) +{ + return test_bit(IPS_CONFIRMED_BIT, &ct->status); +} + +static inline int nf_ct_is_dying(struct nf_conn *ct) +{ + return test_bit(IPS_DYING_BIT, &ct->status); +} + +extern unsigned int nf_conntrack_htable_size; + +#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++) + +#ifdef CONFIG_NF_CONNTRACK_EVENTS +#include <linux/notifier.h> +#include <linux/interrupt.h> + +struct nf_conntrack_ecache { + struct nf_conn *ct; + unsigned int events; +}; +DECLARE_PER_CPU(struct nf_conntrack_ecache, nf_conntrack_ecache); + +#define CONNTRACK_ECACHE(x) (__get_cpu_var(nf_conntrack_ecache).x) + +extern struct notifier_block *nf_conntrack_chain; +extern struct notifier_block *nf_conntrack_expect_chain; + +static inline int nf_conntrack_register_notifier(struct notifier_block *nb) +{ + return notifier_chain_register(&nf_conntrack_chain, nb); +} + +static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb) +{ + return notifier_chain_unregister(&nf_conntrack_chain, nb); +} + +static inline int +nf_conntrack_expect_register_notifier(struct notifier_block *nb) +{ + return notifier_chain_register(&nf_conntrack_expect_chain, nb); +} + +static inline int +nf_conntrack_expect_unregister_notifier(struct notifier_block *nb) +{ + return notifier_chain_unregister(&nf_conntrack_expect_chain, nb); +} + +extern void nf_ct_deliver_cached_events(const struct nf_conn *ct); +extern void __nf_ct_event_cache_init(struct nf_conn *ct); + +static inline void +nf_conntrack_event_cache(enum ip_conntrack_events event, + const struct sk_buff *skb) +{ + struct nf_conn *ct = (struct nf_conn *)skb->nfct; + struct nf_conntrack_ecache *ecache; + + local_bh_disable(); + ecache = &__get_cpu_var(nf_conntrack_ecache); + if (ct != ecache->ct) + __nf_ct_event_cache_init(ct); + ecache->events |= event; + local_bh_enable(); +} + +static inline void nf_conntrack_event(enum ip_conntrack_events event, + struct nf_conn *ct) +{ + if (nf_ct_is_confirmed(ct) && !nf_ct_is_dying(ct)) + notifier_call_chain(&nf_conntrack_chain, event, ct); +} + +static inline void +nf_conntrack_expect_event(enum ip_conntrack_expect_events event, + struct nf_conntrack_expect *exp) +{ + notifier_call_chain(&nf_conntrack_expect_chain, event, exp); +} +#else /* CONFIG_NF_CONNTRACK_EVENTS */ +static inline void nf_conntrack_event_cache(enum ip_conntrack_events event, + const struct sk_buff *skb) {} +static inline void nf_conntrack_event(enum ip_conntrack_events event, + struct nf_conn *ct) {} +static inline void nf_ct_deliver_cached_events(const struct nf_conn *ct) {} +static inline void +nf_conntrack_expect_event(enum ip_conntrack_expect_events event, + struct nf_conntrack_expect *exp) {} +#endif /* CONFIG_NF_CONNTRACK_EVENTS */ + +/* no helper, no nat */ +#define NF_CT_F_BASIC 0 +/* for helper */ +#define NF_CT_F_HELP 1 +/* for nat. */ +#define NF_CT_F_NAT 2 +#define NF_CT_F_NUM 4 + +extern int +nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size, + int (*init_conntrack)(struct nf_conn *, u_int32_t)); +extern void +nf_conntrack_unregister_cache(u_int32_t features); + +#endif /* __KERNEL__ */ +#endif /* _NF_CONNTRACK_H */ |