| /* |
| * 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; |
| |
| struct hlist_head expectations; |
| |
| /* 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 |
| |
| #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; |
| |
| /* Extensions */ |
| struct nf_ct_ext *ext; |
| |
| struct rcu_head rcu; |
| }; |
| |
| 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 hlist_head *nf_ct_alloc_hashtable(unsigned int *sizep, int *vmalloced); |
| extern void nf_ct_free_hashtable(struct hlist_head *hash, int vmalloced, |
| unsigned int size); |
| |
| extern struct nf_conntrack_tuple_hash * |
| __nf_conntrack_find(const struct nf_conntrack_tuple *tuple); |
| |
| extern void nf_conntrack_hash_insert(struct nf_conn *ct); |
| |
| extern void nf_conntrack_flush(void); |
| |
| extern int nf_ct_get_tuplepr(const struct sk_buff *skb, |
| unsigned int nhoff, |
| u_int16_t l3num, |
| struct nf_conntrack_tuple *tuple); |
| 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); |
| |
| /* Fake conntrack entry for untracked connections */ |
| extern struct nf_conn nf_conntrack_untracked; |
| |
| /* 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); |
| } |
| |
| static inline int nf_ct_is_untracked(const struct sk_buff *skb) |
| { |
| return (skb->nfct == &nf_conntrack_untracked.ct_general); |
| } |
| |
| extern int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); |
| 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) |
| |
| #endif /* __KERNEL__ */ |
| #endif /* _NF_CONNTRACK_H */ |