| #ifndef _IP_CONNTRACK_H |
| #define _IP_CONNTRACK_H |
| /* Connection state tracking for netfilter. This is separated from, |
| but required by, the NAT layer; it can also be used by an iptables |
| extension. */ |
| enum ip_conntrack_info |
| { |
| /* Part of an established connection (either direction). */ |
| IP_CT_ESTABLISHED, |
| |
| /* Like NEW, but related to an existing connection, or ICMP error |
| (in either direction). */ |
| IP_CT_RELATED, |
| |
| /* Started a new connection to track (only |
| IP_CT_DIR_ORIGINAL); may be a retransmission. */ |
| IP_CT_NEW, |
| |
| /* >= this indicates reply direction */ |
| IP_CT_IS_REPLY, |
| |
| /* Number of distinct IP_CT types (no NEW in reply dirn). */ |
| IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1 |
| }; |
| |
| /* Bitset representing status of connection. */ |
| enum ip_conntrack_status { |
| /* It's an expected connection: bit 0 set. This bit never changed */ |
| IPS_EXPECTED_BIT = 0, |
| IPS_EXPECTED = (1 << IPS_EXPECTED_BIT), |
| |
| /* We've seen packets both ways: bit 1 set. Can be set, not unset. */ |
| IPS_SEEN_REPLY_BIT = 1, |
| IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT), |
| |
| /* Conntrack should never be early-expired. */ |
| IPS_ASSURED_BIT = 2, |
| IPS_ASSURED = (1 << IPS_ASSURED_BIT), |
| |
| /* Connection is confirmed: originating packet has left box */ |
| IPS_CONFIRMED_BIT = 3, |
| IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT), |
| |
| /* Connection needs src nat in orig dir. This bit never changed. */ |
| IPS_SRC_NAT_BIT = 4, |
| IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT), |
| |
| /* Connection needs dst nat in orig dir. This bit never changed. */ |
| IPS_DST_NAT_BIT = 5, |
| IPS_DST_NAT = (1 << IPS_DST_NAT_BIT), |
| |
| /* Both together. */ |
| IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT), |
| |
| /* Connection needs TCP sequence adjusted. */ |
| IPS_SEQ_ADJUST_BIT = 6, |
| IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT), |
| |
| /* NAT initialization bits. */ |
| IPS_SRC_NAT_DONE_BIT = 7, |
| IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT), |
| |
| IPS_DST_NAT_DONE_BIT = 8, |
| IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT), |
| |
| /* Both together */ |
| IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE), |
| |
| /* Connection is dying (removed from lists), can not be unset. */ |
| IPS_DYING_BIT = 9, |
| IPS_DYING = (1 << IPS_DYING_BIT), |
| }; |
| |
| /* Connection tracking event bits */ |
| enum ip_conntrack_events |
| { |
| /* New conntrack */ |
| IPCT_NEW_BIT = 0, |
| IPCT_NEW = (1 << IPCT_NEW_BIT), |
| |
| /* Expected connection */ |
| IPCT_RELATED_BIT = 1, |
| IPCT_RELATED = (1 << IPCT_RELATED_BIT), |
| |
| /* Destroyed conntrack */ |
| IPCT_DESTROY_BIT = 2, |
| IPCT_DESTROY = (1 << IPCT_DESTROY_BIT), |
| |
| /* Timer has been refreshed */ |
| IPCT_REFRESH_BIT = 3, |
| IPCT_REFRESH = (1 << IPCT_REFRESH_BIT), |
| |
| /* Status has changed */ |
| IPCT_STATUS_BIT = 4, |
| IPCT_STATUS = (1 << IPCT_STATUS_BIT), |
| |
| /* Update of protocol info */ |
| IPCT_PROTOINFO_BIT = 5, |
| IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT), |
| |
| /* Volatile protocol info */ |
| IPCT_PROTOINFO_VOLATILE_BIT = 6, |
| IPCT_PROTOINFO_VOLATILE = (1 << IPCT_PROTOINFO_VOLATILE_BIT), |
| |
| /* New helper for conntrack */ |
| IPCT_HELPER_BIT = 7, |
| IPCT_HELPER = (1 << IPCT_HELPER_BIT), |
| |
| /* Update of helper info */ |
| IPCT_HELPINFO_BIT = 8, |
| IPCT_HELPINFO = (1 << IPCT_HELPINFO_BIT), |
| |
| /* Volatile helper info */ |
| IPCT_HELPINFO_VOLATILE_BIT = 9, |
| IPCT_HELPINFO_VOLATILE = (1 << IPCT_HELPINFO_VOLATILE_BIT), |
| |
| /* NAT info */ |
| IPCT_NATINFO_BIT = 10, |
| IPCT_NATINFO = (1 << IPCT_NATINFO_BIT), |
| }; |
| |
| enum ip_conntrack_expect_events { |
| IPEXP_NEW_BIT = 0, |
| IPEXP_NEW = (1 << IPEXP_NEW_BIT), |
| }; |
| |
| #ifdef __KERNEL__ |
| #include <linux/config.h> |
| #include <linux/netfilter_ipv4/ip_conntrack_tuple.h> |
| #include <linux/bitops.h> |
| #include <linux/compiler.h> |
| #include <asm/atomic.h> |
| |
| #include <linux/netfilter_ipv4/ip_conntrack_tcp.h> |
| #include <linux/netfilter_ipv4/ip_conntrack_icmp.h> |
| #include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h> |
| #include <linux/netfilter_ipv4/ip_conntrack_sctp.h> |
| |
| /* per conntrack: protocol private data */ |
| union ip_conntrack_proto { |
| /* insert conntrack proto private data here */ |
| struct ip_ct_gre gre; |
| struct ip_ct_sctp sctp; |
| struct ip_ct_tcp tcp; |
| struct ip_ct_icmp icmp; |
| }; |
| |
| union ip_conntrack_expect_proto { |
| /* insert expect proto private data here */ |
| }; |
| |
| /* Add protocol helper include file here */ |
| #include <linux/netfilter_ipv4/ip_conntrack_pptp.h> |
| #include <linux/netfilter_ipv4/ip_conntrack_amanda.h> |
| #include <linux/netfilter_ipv4/ip_conntrack_ftp.h> |
| #include <linux/netfilter_ipv4/ip_conntrack_irc.h> |
| |
| /* per conntrack: application helper private data */ |
| union ip_conntrack_help { |
| /* insert conntrack helper private data (master) here */ |
| struct ip_ct_pptp_master ct_pptp_info; |
| struct ip_ct_ftp_master ct_ftp_info; |
| struct ip_ct_irc_master ct_irc_info; |
| }; |
| |
| #ifdef CONFIG_IP_NF_NAT_NEEDED |
| #include <linux/netfilter_ipv4/ip_nat.h> |
| #include <linux/netfilter_ipv4/ip_nat_pptp.h> |
| |
| /* per conntrack: nat application helper private data */ |
| union ip_conntrack_nat_help { |
| /* insert nat helper private data here */ |
| struct ip_nat_pptp nat_pptp_info; |
| }; |
| #endif |
| |
| #include <linux/types.h> |
| #include <linux/skbuff.h> |
| |
| #ifdef CONFIG_NETFILTER_DEBUG |
| #define IP_NF_ASSERT(x) \ |
| do { \ |
| if (!(x)) \ |
| /* Wooah! I'm tripping my conntrack in a frenzy of \ |
| netplay... */ \ |
| printk("NF_IP_ASSERT: %s:%i(%s)\n", \ |
| __FILE__, __LINE__, __FUNCTION__); \ |
| } while(0) |
| #else |
| #define IP_NF_ASSERT(x) |
| #endif |
| |
| struct ip_conntrack_counter |
| { |
| u_int64_t packets; |
| u_int64_t bytes; |
| }; |
| |
| struct ip_conntrack_helper; |
| |
| struct ip_conntrack |
| { |
| /* 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; |
| |
| /* Have we seen traffic both ways yet? (bitset) */ |
| unsigned long status; |
| |
| /* Timer function; drops refcnt when it goes off. */ |
| struct timer_list timeout; |
| |
| #ifdef CONFIG_IP_NF_CT_ACCT |
| /* Accounting Information (same cache line as other written members) */ |
| struct ip_conntrack_counter counters[IP_CT_DIR_MAX]; |
| #endif |
| /* If we were expected by an expectation, this will be it */ |
| struct ip_conntrack *master; |
| |
| /* Current number of expected connections */ |
| unsigned int expecting; |
| |
| /* Unique ID that identifies this conntrack*/ |
| unsigned int id; |
| |
| /* Helper, if any. */ |
| struct ip_conntrack_helper *helper; |
| |
| /* Storage reserved for other modules: */ |
| union ip_conntrack_proto proto; |
| |
| union ip_conntrack_help help; |
| |
| #ifdef CONFIG_IP_NF_NAT_NEEDED |
| struct { |
| struct ip_nat_info info; |
| union ip_conntrack_nat_help help; |
| #if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \ |
| defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE) |
| int masq_index; |
| #endif |
| } nat; |
| #endif /* CONFIG_IP_NF_NAT_NEEDED */ |
| |
| #if defined(CONFIG_IP_NF_CONNTRACK_MARK) |
| u_int32_t mark; |
| #endif |
| |
| /* Traversed often, so hopefully in different cacheline to top */ |
| /* These are my tuples; original and reply */ |
| struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; |
| }; |
| |
| struct ip_conntrack_expect |
| { |
| /* Internal linked list (global expectation list) */ |
| struct list_head list; |
| |
| /* We expect this tuple, with the following mask */ |
| struct ip_conntrack_tuple tuple, mask; |
| |
| /* Function to call after setup and insertion */ |
| void (*expectfn)(struct ip_conntrack *new, |
| struct ip_conntrack_expect *this); |
| |
| /* The conntrack of the master connection */ |
| struct ip_conntrack *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_IP_NF_NAT_NEEDED |
| /* This is the original per-proto part, used to map the |
| * expected connection the way the recipient expects. */ |
| union ip_conntrack_manip_proto saved_proto; |
| /* Direction relative to the master connection. */ |
| enum ip_conntrack_dir dir; |
| #endif |
| }; |
| |
| #define IP_CT_EXPECT_PERMANENT 0x1 |
| |
| static inline struct ip_conntrack * |
| tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash) |
| { |
| return container_of(hash, struct ip_conntrack, |
| 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 |
| ip_conntrack_alter_reply(struct ip_conntrack *conntrack, |
| const struct ip_conntrack_tuple *newreply); |
| |
| /* Is this tuple taken? (ignoring any belonging to the given |
| conntrack). */ |
| extern int |
| ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple, |
| const struct ip_conntrack *ignored_conntrack); |
| |
| /* Return conntrack_info and tuple hash for given skb. */ |
| static inline struct ip_conntrack * |
| ip_conntrack_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) |
| { |
| *ctinfo = skb->nfctinfo; |
| return (struct ip_conntrack *)skb->nfct; |
| } |
| |
| /* decrement reference count on a conntrack */ |
| static inline void |
| ip_conntrack_put(struct ip_conntrack *ct) |
| { |
| IP_NF_ASSERT(ct); |
| nf_conntrack_put(&ct->ct_general); |
| } |
| |
| /* call to create an explicit dependency on ip_conntrack. */ |
| extern void need_ip_conntrack(void); |
| |
| extern int invert_tuplepr(struct ip_conntrack_tuple *inverse, |
| const struct ip_conntrack_tuple *orig); |
| |
| extern void __ip_ct_refresh_acct(struct ip_conntrack *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 ip_ct_refresh_acct(struct ip_conntrack *ct, |
| enum ip_conntrack_info ctinfo, |
| const struct sk_buff *skb, |
| unsigned long extra_jiffies) |
| { |
| __ip_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); |
| } |
| |
| /* Refresh conntrack for this many jiffies */ |
| static inline void ip_ct_refresh(struct ip_conntrack *ct, |
| const struct sk_buff *skb, |
| unsigned long extra_jiffies) |
| { |
| __ip_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 ip_conntrack_tcp_update(struct sk_buff *skb, |
| struct ip_conntrack *conntrack, |
| enum ip_conntrack_dir dir); |
| |
| /* Call me when a conntrack is destroyed. */ |
| extern void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack); |
| |
| /* Fake conntrack entry for untracked connections */ |
| extern struct ip_conntrack ip_conntrack_untracked; |
| |
| /* Returns new sk_buff, or NULL */ |
| struct sk_buff * |
| ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user); |
| |
| /* Iterate over all conntracks: if iter returns true, it's deleted. */ |
| extern void |
| ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data), |
| void *data); |
| |
| extern struct ip_conntrack_helper * |
| __ip_conntrack_helper_find_byname(const char *); |
| extern struct ip_conntrack_helper * |
| ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple); |
| extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper); |
| |
| extern struct ip_conntrack_protocol * |
| __ip_conntrack_proto_find(u_int8_t protocol); |
| extern struct ip_conntrack_protocol * |
| ip_conntrack_proto_find_get(u_int8_t protocol); |
| extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto); |
| |
| extern void ip_ct_remove_expectations(struct ip_conntrack *ct); |
| |
| extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *, |
| struct ip_conntrack_tuple *); |
| |
| extern void ip_conntrack_free(struct ip_conntrack *ct); |
| |
| extern void ip_conntrack_hash_insert(struct ip_conntrack *ct); |
| |
| extern struct ip_conntrack_expect * |
| __ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple); |
| |
| extern struct ip_conntrack_expect * |
| ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple); |
| |
| extern struct ip_conntrack_tuple_hash * |
| __ip_conntrack_find(const struct ip_conntrack_tuple *tuple, |
| const struct ip_conntrack *ignored_conntrack); |
| |
| extern void ip_conntrack_flush(void); |
| |
| /* It's confirmed if it is, or has been in the hash table. */ |
| static inline int is_confirmed(struct ip_conntrack *ct) |
| { |
| return test_bit(IPS_CONFIRMED_BIT, &ct->status); |
| } |
| |
| static inline int is_dying(struct ip_conntrack *ct) |
| { |
| return test_bit(IPS_DYING_BIT, &ct->status); |
| } |
| |
| extern unsigned int ip_conntrack_htable_size; |
| |
| struct ip_conntrack_stat |
| { |
| unsigned int searched; |
| unsigned int found; |
| unsigned int new; |
| unsigned int invalid; |
| unsigned int ignore; |
| unsigned int delete; |
| unsigned int delete_list; |
| unsigned int insert; |
| unsigned int insert_failed; |
| unsigned int drop; |
| unsigned int early_drop; |
| unsigned int error; |
| unsigned int expect_new; |
| unsigned int expect_create; |
| unsigned int expect_delete; |
| }; |
| |
| #define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++) |
| |
| #ifdef CONFIG_IP_NF_CONNTRACK_EVENTS |
| #include <linux/notifier.h> |
| #include <linux/interrupt.h> |
| |
| struct ip_conntrack_ecache { |
| struct ip_conntrack *ct; |
| unsigned int events; |
| }; |
| DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache); |
| |
| #define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x) |
| |
| extern struct notifier_block *ip_conntrack_chain; |
| extern struct notifier_block *ip_conntrack_expect_chain; |
| |
| static inline int ip_conntrack_register_notifier(struct notifier_block *nb) |
| { |
| return notifier_chain_register(&ip_conntrack_chain, nb); |
| } |
| |
| static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb) |
| { |
| return notifier_chain_unregister(&ip_conntrack_chain, nb); |
| } |
| |
| static inline int |
| ip_conntrack_expect_register_notifier(struct notifier_block *nb) |
| { |
| return notifier_chain_register(&ip_conntrack_expect_chain, nb); |
| } |
| |
| static inline int |
| ip_conntrack_expect_unregister_notifier(struct notifier_block *nb) |
| { |
| return notifier_chain_unregister(&ip_conntrack_expect_chain, nb); |
| } |
| |
| extern void ip_ct_deliver_cached_events(const struct ip_conntrack *ct); |
| extern void __ip_ct_event_cache_init(struct ip_conntrack *ct); |
| |
| static inline void |
| ip_conntrack_event_cache(enum ip_conntrack_events event, |
| const struct sk_buff *skb) |
| { |
| struct ip_conntrack *ct = (struct ip_conntrack *)skb->nfct; |
| struct ip_conntrack_ecache *ecache; |
| |
| local_bh_disable(); |
| ecache = &__get_cpu_var(ip_conntrack_ecache); |
| if (ct != ecache->ct) |
| __ip_ct_event_cache_init(ct); |
| ecache->events |= event; |
| local_bh_enable(); |
| } |
| |
| static inline void ip_conntrack_event(enum ip_conntrack_events event, |
| struct ip_conntrack *ct) |
| { |
| if (is_confirmed(ct) && !is_dying(ct)) |
| notifier_call_chain(&ip_conntrack_chain, event, ct); |
| } |
| |
| static inline void |
| ip_conntrack_expect_event(enum ip_conntrack_expect_events event, |
| struct ip_conntrack_expect *exp) |
| { |
| notifier_call_chain(&ip_conntrack_expect_chain, event, exp); |
| } |
| #else /* CONFIG_IP_NF_CONNTRACK_EVENTS */ |
| static inline void ip_conntrack_event_cache(enum ip_conntrack_events event, |
| const struct sk_buff *skb) {} |
| static inline void ip_conntrack_event(enum ip_conntrack_events event, |
| struct ip_conntrack *ct) {} |
| static inline void ip_ct_deliver_cached_events(const struct ip_conntrack *ct) {} |
| static inline void |
| ip_conntrack_expect_event(enum ip_conntrack_expect_events event, |
| struct ip_conntrack_expect *exp) {} |
| #endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */ |
| |
| #ifdef CONFIG_IP_NF_NAT_NEEDED |
| static inline int ip_nat_initialized(struct ip_conntrack *conntrack, |
| enum ip_nat_manip_type manip) |
| { |
| if (manip == IP_NAT_MANIP_SRC) |
| return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status); |
| return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status); |
| } |
| #endif /* CONFIG_IP_NF_NAT_NEEDED */ |
| |
| #endif /* __KERNEL__ */ |
| #endif /* _IP_CONNTRACK_H */ |