| /* |
| * 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; |
| |
| /* nf_conn feature for connections that have a helper */ |
| struct nf_conn_help { |
| /* Helper. if any */ |
| struct nf_conntrack_helper *helper; |
| |
| union nf_conntrack_help help; |
| |
| /* Current number of expected connections */ |
| unsigned int expecting; |
| }; |
| |
| |
| #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; |
| |
| /* If we were expected by an expectation, this will be it */ |
| struct nf_conn *master; |
| |
| /* 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 |
| |
| /* Unique ID that identifies this conntrack*/ |
| unsigned int id; |
| |
| /* features - nat, helper, ... used by allocating system */ |
| u_int32_t features; |
| |
| #if defined(CONFIG_NF_CONNTRACK_MARK) |
| u_int32_t mark; |
| #endif |
| |
| /* Storage reserved for other modules: */ |
| union nf_conntrack_proto proto; |
| |
| /* features dynamically at the end: helper, nat (both optional) */ |
| char 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; |
| |
| /* Unique ID */ |
| unsigned int id; |
| |
| /* 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); |
| } |
| |
| /* Protocol module loading */ |
| extern int nf_ct_l3proto_try_module_get(unsigned short l3proto); |
| extern void nf_ct_l3proto_module_put(unsigned short l3proto); |
| |
| extern struct nf_conntrack_tuple_hash * |
| __nf_conntrack_find(const struct nf_conntrack_tuple *tuple, |
| const struct nf_conn *ignored_conntrack); |
| |
| extern void nf_conntrack_hash_insert(struct nf_conn *ct); |
| |
| extern struct nf_conntrack_expect * |
| __nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple); |
| |
| extern struct nf_conntrack_expect * |
| nf_conntrack_expect_find(const struct nf_conntrack_tuple *tuple); |
| |
| extern void nf_ct_unlink_expect(struct nf_conntrack_expect *exp); |
| |
| extern void nf_ct_remove_expectations(struct nf_conn *ct); |
| |
| extern void nf_conntrack_flush(void); |
| |
| extern struct nf_conntrack_helper * |
| nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple); |
| extern void nf_ct_helper_put(struct nf_conntrack_helper *helper); |
| |
| extern struct nf_conntrack_helper * |
| __nf_conntrack_helper_find_byname(const char *name); |
| |
| 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 atomic_notifier_head nf_conntrack_chain; |
| extern struct atomic_notifier_head nf_conntrack_expect_chain; |
| |
| static inline int nf_conntrack_register_notifier(struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_register(&nf_conntrack_chain, nb); |
| } |
| |
| static inline int nf_conntrack_unregister_notifier(struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_unregister(&nf_conntrack_chain, nb); |
| } |
| |
| static inline int |
| nf_conntrack_expect_register_notifier(struct notifier_block *nb) |
| { |
| return atomic_notifier_chain_register(&nf_conntrack_expect_chain, nb); |
| } |
| |
| static inline int |
| nf_conntrack_expect_unregister_notifier(struct notifier_block *nb) |
| { |
| return atomic_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)) |
| atomic_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) |
| { |
| atomic_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); |
| extern void |
| nf_conntrack_unregister_cache(u_int32_t features); |
| |
| /* valid combinations: |
| * basic: nf_conn, nf_conn .. nf_conn_help |
| * nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat, nf_conn help |
| */ |
| static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct) |
| { |
| unsigned int offset = sizeof(struct nf_conn); |
| |
| if (!(ct->features & NF_CT_F_HELP)) |
| return NULL; |
| |
| return (struct nf_conn_help *) ((void *)ct + offset); |
| } |
| |
| #endif /* __KERNEL__ */ |
| #endif /* _NF_CONNTRACK_H */ |