324 lines
9.1 KiB
C
324 lines
9.1 KiB
C
/*
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* Connection state tracking for netfilter. This is separated from,
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* but required by, the (future) NAT layer; it can also be used by an iptables
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* extension.
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*
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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - generalize L3 protocol dependent part.
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*
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* Derived from include/linux/netfiter_ipv4/ip_conntrack.h
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*/
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#ifndef _NF_CONNTRACK_H
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#define _NF_CONNTRACK_H
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#include <linux/netfilter/nf_conntrack_common.h>
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#ifdef __KERNEL__
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#include <linux/bitops.h>
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#include <linux/compiler.h>
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#include <asm/atomic.h>
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#include <linux/netfilter/nf_conntrack_tcp.h>
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#include <linux/netfilter/nf_conntrack_sctp.h>
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#include <linux/netfilter/nf_conntrack_proto_gre.h>
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#include <net/netfilter/ipv4/nf_conntrack_icmp.h>
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#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h>
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#include <net/netfilter/nf_conntrack_tuple.h>
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/* per conntrack: protocol private data */
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union nf_conntrack_proto {
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/* insert conntrack proto private data here */
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struct ip_ct_sctp sctp;
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struct ip_ct_tcp tcp;
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struct ip_ct_icmp icmp;
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struct nf_ct_icmpv6 icmpv6;
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struct nf_ct_gre gre;
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};
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union nf_conntrack_expect_proto {
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/* insert expect proto private data here */
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};
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/* Add protocol helper include file here */
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#include <linux/netfilter/nf_conntrack_ftp.h>
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#include <linux/netfilter/nf_conntrack_pptp.h>
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#include <linux/netfilter/nf_conntrack_h323.h>
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#include <linux/netfilter/nf_conntrack_sane.h>
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/* per conntrack: application helper private data */
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union nf_conntrack_help {
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/* insert conntrack helper private data (master) here */
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struct nf_ct_ftp_master ct_ftp_info;
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struct nf_ct_pptp_master ct_pptp_info;
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struct nf_ct_h323_master ct_h323_info;
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struct nf_ct_sane_master ct_sane_info;
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};
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/timer.h>
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#ifdef CONFIG_NETFILTER_DEBUG
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#define NF_CT_ASSERT(x) \
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do { \
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if (!(x)) \
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/* Wooah! I'm tripping my conntrack in a frenzy of \
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netplay... */ \
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printk("NF_CT_ASSERT: %s:%i(%s)\n", \
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__FILE__, __LINE__, __FUNCTION__); \
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} while(0)
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#else
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#define NF_CT_ASSERT(x)
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#endif
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struct nf_conntrack_helper;
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/* nf_conn feature for connections that have a helper */
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struct nf_conn_help {
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/* Helper. if any */
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struct nf_conntrack_helper *helper;
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union nf_conntrack_help help;
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/* Current number of expected connections */
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unsigned int expecting;
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};
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#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
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#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
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struct nf_conn
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{
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/* Usage count in here is 1 for hash table/destruct timer, 1 per skb,
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plus 1 for any connection(s) we are `master' for */
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struct nf_conntrack ct_general;
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/* XXX should I move this to the tail ? - Y.K */
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/* These are my tuples; original and reply */
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struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
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/* Have we seen traffic both ways yet? (bitset) */
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unsigned long status;
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/* If we were expected by an expectation, this will be it */
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struct nf_conn *master;
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/* Timer function; drops refcnt when it goes off. */
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struct timer_list timeout;
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#ifdef CONFIG_NF_CT_ACCT
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/* Accounting Information (same cache line as other written members) */
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struct ip_conntrack_counter counters[IP_CT_DIR_MAX];
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#endif
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/* Unique ID that identifies this conntrack*/
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unsigned int id;
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/* features - nat, helper, ... used by allocating system */
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u_int32_t features;
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#if defined(CONFIG_NF_CONNTRACK_MARK)
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u_int32_t mark;
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#endif
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
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u_int32_t secmark;
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#endif
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/* Storage reserved for other modules: */
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union nf_conntrack_proto proto;
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/* features dynamically at the end: helper, nat (both optional) */
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char data[0];
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};
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static inline struct nf_conn *
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nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash)
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{
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return container_of(hash, struct nf_conn,
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tuplehash[hash->tuple.dst.dir]);
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}
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/* get master conntrack via master expectation */
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#define master_ct(conntr) (conntr->master)
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/* Alter reply tuple (maybe alter helper). */
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extern void
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nf_conntrack_alter_reply(struct nf_conn *conntrack,
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const struct nf_conntrack_tuple *newreply);
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/* Is this tuple taken? (ignoring any belonging to the given
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conntrack). */
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extern int
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nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
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const struct nf_conn *ignored_conntrack);
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/* Return conntrack_info and tuple hash for given skb. */
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static inline struct nf_conn *
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nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo)
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{
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*ctinfo = skb->nfctinfo;
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return (struct nf_conn *)skb->nfct;
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}
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/* decrement reference count on a conntrack */
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static inline void nf_ct_put(struct nf_conn *ct)
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{
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NF_CT_ASSERT(ct);
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nf_conntrack_put(&ct->ct_general);
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}
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/* Protocol module loading */
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extern int nf_ct_l3proto_try_module_get(unsigned short l3proto);
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extern void nf_ct_l3proto_module_put(unsigned short l3proto);
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extern struct nf_conntrack_tuple_hash *
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__nf_conntrack_find(const struct nf_conntrack_tuple *tuple,
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const struct nf_conn *ignored_conntrack);
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extern void nf_conntrack_hash_insert(struct nf_conn *ct);
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extern void nf_conntrack_flush(void);
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extern struct nf_conntrack_helper *
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nf_ct_helper_find_get( const struct nf_conntrack_tuple *tuple);
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extern void nf_ct_helper_put(struct nf_conntrack_helper *helper);
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extern struct nf_conntrack_helper *
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__nf_conntrack_helper_find_byname(const char *name);
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extern int nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse,
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const struct nf_conntrack_tuple *orig);
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extern void __nf_ct_refresh_acct(struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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const struct sk_buff *skb,
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unsigned long extra_jiffies,
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int do_acct);
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/* Refresh conntrack for this many jiffies and do accounting */
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static inline void nf_ct_refresh_acct(struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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const struct sk_buff *skb,
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unsigned long extra_jiffies)
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{
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__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
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}
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/* Refresh conntrack for this many jiffies */
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static inline void nf_ct_refresh(struct nf_conn *ct,
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const struct sk_buff *skb,
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unsigned long extra_jiffies)
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{
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__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
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}
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/* These are for NAT. Icky. */
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/* Update TCP window tracking data when NAT mangles the packet */
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extern void nf_conntrack_tcp_update(struct sk_buff *skb,
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unsigned int dataoff,
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struct nf_conn *conntrack,
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int dir);
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/* Call me when a conntrack is destroyed. */
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extern void (*nf_conntrack_destroyed)(struct nf_conn *conntrack);
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/* Fake conntrack entry for untracked connections */
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extern struct nf_conn nf_conntrack_untracked;
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extern int nf_ct_no_defrag;
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/* Iterate over all conntracks: if iter returns true, it's deleted. */
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extern void
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nf_ct_iterate_cleanup(int (*iter)(struct nf_conn *i, void *data), void *data);
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extern void nf_conntrack_free(struct nf_conn *ct);
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extern struct nf_conn *
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nf_conntrack_alloc(const struct nf_conntrack_tuple *orig,
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const struct nf_conntrack_tuple *repl);
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/* It's confirmed if it is, or has been in the hash table. */
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static inline int nf_ct_is_confirmed(struct nf_conn *ct)
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{
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return test_bit(IPS_CONFIRMED_BIT, &ct->status);
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}
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static inline int nf_ct_is_dying(struct nf_conn *ct)
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{
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return test_bit(IPS_DYING_BIT, &ct->status);
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}
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extern unsigned int nf_conntrack_htable_size;
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extern int nf_conntrack_checksum;
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extern atomic_t nf_conntrack_count;
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extern int nf_conntrack_max;
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DECLARE_PER_CPU(struct ip_conntrack_stat, nf_conntrack_stat);
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#define NF_CT_STAT_INC(count) (__get_cpu_var(nf_conntrack_stat).count++)
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#define NF_CT_STAT_INC_ATOMIC(count) \
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do { \
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local_bh_disable(); \
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__get_cpu_var(nf_conntrack_stat).count++; \
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local_bh_enable(); \
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} while (0)
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/* no helper, no nat */
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#define NF_CT_F_BASIC 0
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/* for helper */
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#define NF_CT_F_HELP 1
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/* for nat. */
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#define NF_CT_F_NAT 2
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#define NF_CT_F_NUM 4
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extern int
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nf_conntrack_register_cache(u_int32_t features, const char *name, size_t size);
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extern void
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nf_conntrack_unregister_cache(u_int32_t features);
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/* valid combinations:
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* basic: nf_conn, nf_conn .. nf_conn_help
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* nat: nf_conn .. nf_conn_nat, nf_conn .. nf_conn_nat .. nf_conn help
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*/
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#ifdef CONFIG_NF_NAT_NEEDED
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static inline struct nf_conn_nat *nfct_nat(const struct nf_conn *ct)
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{
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unsigned int offset = sizeof(struct nf_conn);
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if (!(ct->features & NF_CT_F_NAT))
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return NULL;
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offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
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return (struct nf_conn_nat *) ((void *)ct + offset);
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}
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static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
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{
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unsigned int offset = sizeof(struct nf_conn);
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if (!(ct->features & NF_CT_F_HELP))
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return NULL;
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if (ct->features & NF_CT_F_NAT) {
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offset = ALIGN(offset, __alignof__(struct nf_conn_nat));
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offset += sizeof(struct nf_conn_nat);
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}
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offset = ALIGN(offset, __alignof__(struct nf_conn_help));
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return (struct nf_conn_help *) ((void *)ct + offset);
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}
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#else /* No NAT */
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static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
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{
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unsigned int offset = sizeof(struct nf_conn);
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if (!(ct->features & NF_CT_F_HELP))
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return NULL;
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offset = ALIGN(offset, __alignof__(struct nf_conn_help));
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return (struct nf_conn_help *) ((void *)ct + offset);
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}
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#endif /* CONFIG_NF_NAT_NEEDED */
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#endif /* __KERNEL__ */
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#endif /* _NF_CONNTRACK_H */
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