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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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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - generalize L3 protocol dependent part.
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* Derived from include/linux/netfiter_ipv4/ip_conntrack.h
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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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#include <linux/bitops.h>
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#include <linux/compiler.h>
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#include <linux/atomic.h>
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#include <linux/netfilter/nf_conntrack_tcp.h>
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#include <linux/netfilter/nf_conntrack_dccp.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/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 nf_ct_dccp dccp;
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struct ip_ct_sctp sctp;
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union nf_conntrack_expect_proto {
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/* insert expect proto private data here */
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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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#include <linux/netfilter/nf_conntrack_sip.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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#if defined(CONFIG_NF_CONNTRACK_FTP) || defined(CONFIG_NF_CONNTRACK_FTP_MODULE)
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struct nf_ct_ftp_master ct_ftp_info;
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#if defined(CONFIG_NF_CONNTRACK_PPTP) || \
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defined(CONFIG_NF_CONNTRACK_PPTP_MODULE)
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struct nf_ct_pptp_master ct_pptp_info;
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#if defined(CONFIG_NF_CONNTRACK_H323) || \
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defined(CONFIG_NF_CONNTRACK_H323_MODULE)
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struct nf_ct_h323_master ct_h323_info;
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#if defined(CONFIG_NF_CONNTRACK_SANE) || \
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defined(CONFIG_NF_CONNTRACK_SANE_MODULE)
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struct nf_ct_sane_master ct_sane_info;
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#if defined(CONFIG_NF_CONNTRACK_SIP) || defined(CONFIG_NF_CONNTRACK_SIP_MODULE)
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struct nf_ct_sip_master ct_sip_info;
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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) WARN_ON(!(x))
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#define NF_CT_ASSERT(x)
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struct nf_conntrack_helper;
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/* Must be kept in sync with the classes defined by helpers */
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#define NF_CT_MAX_EXPECT_CLASSES 4
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/* nf_conn feature for connections that have a helper */
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struct nf_conntrack_helper __rcu *helper;
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union nf_conntrack_help help;
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struct hlist_head expectations;
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/* Current number of expected connections */
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u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
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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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/* 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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#if defined(CONFIG_NF_CONNTRACK_MARK)
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#ifdef CONFIG_NF_CONNTRACK_SECMARK
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struct nf_ct_ext *ext;
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/* Storage reserved for other modules, must be the last member */
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union nf_conntrack_proto proto;
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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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return container_of(hash, struct nf_conn,
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tuplehash[hash->tuple.dst.dir]);
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static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct)
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return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
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static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct)
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return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum;
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#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple)
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/* get master conntrack via master expectation */
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#define master_ct(conntr) (conntr->master)
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extern struct net init_net;
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static inline struct net *nf_ct_net(const struct nf_conn *ct)
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return read_pnet(&ct->ct_net);
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/* Alter reply tuple (maybe alter helper). */
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nf_conntrack_alter_reply(struct nf_conn *ct,
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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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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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*ctinfo = skb->nfctinfo;
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return (struct nf_conn *)skb->nfct;
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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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nf_conntrack_put(&ct->ct_general);
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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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* Allocate a hashtable of hlist_head (if nulls == 0),
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* or hlist_nulls_head (if nulls == 1)
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extern void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls);
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extern void nf_ct_free_hashtable(void *hash, unsigned int size);
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extern struct nf_conntrack_tuple_hash *
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__nf_conntrack_find(struct net *net, u16 zone,
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const struct nf_conntrack_tuple *tuple);
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extern void nf_conntrack_hash_insert(struct nf_conn *ct);
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extern void nf_ct_delete_from_lists(struct nf_conn *ct);
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extern void nf_ct_insert_dying_list(struct nf_conn *ct);
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extern void nf_conntrack_flush_report(struct net *net, u32 pid, int report);
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extern bool nf_ct_get_tuplepr(const struct sk_buff *skb,
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unsigned int nhoff, u_int16_t l3num,
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struct nf_conntrack_tuple *tuple);
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extern bool 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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/* 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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__nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1);
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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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__nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0);
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extern bool __nf_ct_kill_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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/* kill conntrack and do accounting */
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static inline bool nf_ct_kill_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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return __nf_ct_kill_acct(ct, ctinfo, skb, 1);
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/* kill conntrack without accounting */
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static inline bool nf_ct_kill(struct nf_conn *ct)
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return __nf_ct_kill_acct(ct, 0, NULL, 0);
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/* These are for NAT. Icky. */
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extern s16 (*nf_ct_nat_offset)(const struct nf_conn *ct,
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enum ip_conntrack_dir dir,
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/* Fake conntrack entry for untracked connections */
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DECLARE_PER_CPU(struct nf_conn, nf_conntrack_untracked);
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static inline struct nf_conn *nf_ct_untracked_get(void)
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return &__raw_get_cpu_var(nf_conntrack_untracked);
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extern void nf_ct_untracked_status_or(unsigned long bits);
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/* Iterate over all conntracks: if iter returns true, it's deleted. */
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nf_ct_iterate_cleanup(struct net *net, 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(struct net *net, u16 zone,
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const struct nf_conntrack_tuple *orig,
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const struct nf_conntrack_tuple *repl,
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static inline int nf_ct_is_template(const struct nf_conn *ct)
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return test_bit(IPS_TEMPLATE_BIT, &ct->status);
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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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return test_bit(IPS_CONFIRMED_BIT, &ct->status);
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static inline int nf_ct_is_dying(struct nf_conn *ct)
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return test_bit(IPS_DYING_BIT, &ct->status);
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static inline int nf_ct_is_untracked(const struct nf_conn *ct)
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return test_bit(IPS_UNTRACKED_BIT, &ct->status);
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/* Packet is received from loopback */
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static inline bool nf_is_loopback_packet(const struct sk_buff *skb)
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return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK;
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extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp);
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extern unsigned int nf_conntrack_htable_size;
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extern unsigned int nf_conntrack_max;
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extern unsigned int nf_conntrack_hash_rnd;
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void init_nf_conntrack_hash_rnd(void);
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#define NF_CT_STAT_INC(net, count) \
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__this_cpu_inc((net)->ct.stat->count)
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#define NF_CT_STAT_INC_ATOMIC(net, count) \
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local_bh_disable(); \
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__this_cpu_inc((net)->ct.stat->count); \
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#define MODULE_ALIAS_NFCT_HELPER(helper) \
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MODULE_ALIAS("nfct-helper-" helper)
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#endif /* _NF_CONNTRACK_H */