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- /*
- * 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/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 <linux/netfilter/nf_conntrack_proto_gre.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;
- struct nf_ct_gre gre;
- };
- union nf_conntrack_expect_proto {
- /* insert expect proto private data here */
- };
- /* Add protocol helper include file here */
- #include <linux/netfilter/nf_conntrack_ftp.h>
- #include <linux/netfilter/nf_conntrack_pptp.h>
- #include <linux/netfilter/nf_conntrack_h323.h>
- #include <linux/netfilter/nf_conntrack_sane.h>
- /* per conntrack: application helper private data */
- union nf_conntrack_help {
- /* insert conntrack helper private data (master) here */
- struct nf_ct_ftp_master ct_ftp_info;
- struct nf_ct_pptp_master ct_pptp_info;
- struct nf_ct_h323_master ct_h323_info;
- struct nf_ct_sane_master ct_sane_info;
- };
- #include <linux/types.h>
- #include <linux/skbuff.h>
- #include <linux/timer.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>
- #include <net/netfilter/ipv6/nf_conntrack_ipv6.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
- #ifdef CONFIG_NF_CONNTRACK_SECMARK
- u_int32_t secmark;
- #endif
- /* Storage reserved for other modules: */
- union nf_conntrack_proto proto;
- /* features dynamically at the end: helper, nat (both optional) */
- char data[0];
- };
- 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 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;
- extern int nf_conntrack_checksum;
- extern atomic_t nf_conntrack_count;
- extern int nf_conntrack_max;
- DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
- #define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
- #define NF_CT_STAT_INC_ATOMIC(count) \
- do { \
- local_bh_disable(); \
- __get_cpu_var(nf_conntrack_stat).count++; \
- local_bh_enable(); \
- } while (0)
- /* 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
- */
- #ifdef CONFIG_NF_NAT_NEEDED
- static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
- {
- unsigned int offset = sizeof(struct nf_conn);
- if (!(ct->features & NF_CT_F_NAT))
- return NULL;
- offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
- return (struct nf_conn_nat *) ((void *)ct + offset);
- }
- 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;
- if (ct->features & NF_CT_F_NAT) {
- offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
- offset += sizeof(struct nf_conn_nat);
- }
- offset = ALIGN(offset, __alignof__(struct nf_conn_help));
- return (struct nf_conn_help *) ((void *)ct + offset);
- }
- #else /* No NAT */
- 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;
- offset = ALIGN(offset, __alignof__(struct nf_conn_help));
- return (struct nf_conn_help *) ((void *)ct + offset);
- }
- #endif /* CONFIG_NF_NAT_NEEDED */
- #endif /* __KERNEL__ */
- #endif /* _NF_CONNTRACK_H */
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