![Al Viro](/assets/img/avatar_default.png)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
396 lines
11 KiB
C
396 lines
11 KiB
C
#ifndef _IP_CONNTRACK_H
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#define _IP_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/netfilter_ipv4/ip_conntrack_tuple.h>
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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_ipv4/ip_conntrack_tcp.h>
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#include <linux/netfilter_ipv4/ip_conntrack_icmp.h>
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#include <linux/netfilter_ipv4/ip_conntrack_proto_gre.h>
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#include <linux/netfilter_ipv4/ip_conntrack_sctp.h>
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/* per conntrack: protocol private data */
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union ip_conntrack_proto {
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/* insert conntrack proto private data here */
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struct ip_ct_gre gre;
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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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};
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union ip_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_ipv4/ip_conntrack_h323.h>
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#include <linux/netfilter_ipv4/ip_conntrack_pptp.h>
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#include <linux/netfilter_ipv4/ip_conntrack_amanda.h>
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#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
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#include <linux/netfilter_ipv4/ip_conntrack_irc.h>
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/* per conntrack: application helper private data */
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union ip_conntrack_help {
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/* insert conntrack helper private data (master) here */
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struct ip_ct_h323_master ct_h323_info;
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struct ip_ct_pptp_master ct_pptp_info;
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struct ip_ct_ftp_master ct_ftp_info;
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struct ip_ct_irc_master ct_irc_info;
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};
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#ifdef CONFIG_IP_NF_NAT_NEEDED
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#include <linux/netfilter_ipv4/ip_nat.h>
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#include <linux/netfilter_ipv4/ip_nat_pptp.h>
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/* per conntrack: nat application helper private data */
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union ip_conntrack_nat_help {
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/* insert nat helper private data here */
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struct ip_nat_pptp nat_pptp_info;
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};
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#endif
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#ifdef CONFIG_NETFILTER_DEBUG
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#define IP_NF_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_IP_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 IP_NF_ASSERT(x)
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#endif
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struct ip_conntrack_helper;
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struct ip_conntrack
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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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/* Have we seen traffic both ways yet? (bitset) */
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unsigned long status;
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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_IP_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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/* If we were expected by an expectation, this will be it */
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struct ip_conntrack *master;
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/* Current number of expected connections */
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unsigned int expecting;
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/* Unique ID that identifies this conntrack*/
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unsigned int id;
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/* Helper, if any. */
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struct ip_conntrack_helper *helper;
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/* Storage reserved for other modules: */
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union ip_conntrack_proto proto;
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union ip_conntrack_help help;
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#ifdef CONFIG_IP_NF_NAT_NEEDED
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struct {
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struct ip_nat_info info;
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union ip_conntrack_nat_help help;
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#if defined(CONFIG_IP_NF_TARGET_MASQUERADE) || \
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defined(CONFIG_IP_NF_TARGET_MASQUERADE_MODULE)
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int masq_index;
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#endif
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} nat;
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#endif /* CONFIG_IP_NF_NAT_NEEDED */
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#if defined(CONFIG_IP_NF_CONNTRACK_MARK)
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u_int32_t mark;
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#endif
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#ifdef CONFIG_IP_NF_CONNTRACK_SECMARK
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u_int32_t secmark;
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#endif
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/* Traversed often, so hopefully in different cacheline to top */
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/* These are my tuples; original and reply */
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struct ip_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX];
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};
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struct ip_conntrack_expect
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{
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/* Internal linked list (global expectation list) */
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struct list_head list;
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/* We expect this tuple, with the following mask */
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struct ip_conntrack_tuple tuple, mask;
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/* Function to call after setup and insertion */
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void (*expectfn)(struct ip_conntrack *new,
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struct ip_conntrack_expect *this);
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/* The conntrack of the master connection */
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struct ip_conntrack *master;
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/* Timer function; deletes the expectation. */
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struct timer_list timeout;
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/* Usage count. */
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atomic_t use;
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/* Unique ID */
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unsigned int id;
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/* Flags */
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unsigned int flags;
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#ifdef CONFIG_IP_NF_NAT_NEEDED
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__be32 saved_ip;
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/* This is the original per-proto part, used to map the
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* expected connection the way the recipient expects. */
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union ip_conntrack_manip_proto saved_proto;
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/* Direction relative to the master connection. */
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enum ip_conntrack_dir dir;
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#endif
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};
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#define IP_CT_EXPECT_PERMANENT 0x1
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static inline struct ip_conntrack *
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tuplehash_to_ctrack(const struct ip_conntrack_tuple_hash *hash)
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{
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return container_of(hash, struct ip_conntrack,
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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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ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
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const struct ip_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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ip_conntrack_tuple_taken(const struct ip_conntrack_tuple *tuple,
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const struct ip_conntrack *ignored_conntrack);
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/* Return conntrack_info and tuple hash for given skb. */
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static inline struct ip_conntrack *
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ip_conntrack_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 ip_conntrack *)skb->nfct;
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}
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/* decrement reference count on a conntrack */
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static inline void
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ip_conntrack_put(struct ip_conntrack *ct)
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{
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IP_NF_ASSERT(ct);
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nf_conntrack_put(&ct->ct_general);
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}
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extern int invert_tuplepr(struct ip_conntrack_tuple *inverse,
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const struct ip_conntrack_tuple *orig);
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extern void __ip_ct_refresh_acct(struct ip_conntrack *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 ip_ct_refresh_acct(struct ip_conntrack *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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__ip_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 ip_ct_refresh(struct ip_conntrack *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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__ip_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 ip_conntrack_tcp_update(struct sk_buff *skb,
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struct ip_conntrack *conntrack,
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enum ip_conntrack_dir dir);
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/* Call me when a conntrack is destroyed. */
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extern void (*ip_conntrack_destroyed)(struct ip_conntrack *conntrack);
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/* Fake conntrack entry for untracked connections */
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extern struct ip_conntrack ip_conntrack_untracked;
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/* Returns new sk_buff, or NULL */
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struct sk_buff *
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ip_ct_gather_frags(struct sk_buff *skb, u_int32_t user);
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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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ip_ct_iterate_cleanup(int (*iter)(struct ip_conntrack *i, void *data),
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void *data);
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extern struct ip_conntrack_helper *
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__ip_conntrack_helper_find_byname(const char *);
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extern struct ip_conntrack_helper *
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ip_conntrack_helper_find_get(const struct ip_conntrack_tuple *tuple);
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extern void ip_conntrack_helper_put(struct ip_conntrack_helper *helper);
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extern struct ip_conntrack_protocol *
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__ip_conntrack_proto_find(u_int8_t protocol);
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extern struct ip_conntrack_protocol *
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ip_conntrack_proto_find_get(u_int8_t protocol);
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extern void ip_conntrack_proto_put(struct ip_conntrack_protocol *proto);
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extern void ip_ct_remove_expectations(struct ip_conntrack *ct);
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extern struct ip_conntrack *ip_conntrack_alloc(struct ip_conntrack_tuple *,
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struct ip_conntrack_tuple *);
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extern void ip_conntrack_free(struct ip_conntrack *ct);
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extern void ip_conntrack_hash_insert(struct ip_conntrack *ct);
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extern struct ip_conntrack_expect *
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__ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
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extern struct ip_conntrack_expect *
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ip_conntrack_expect_find(const struct ip_conntrack_tuple *tuple);
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extern struct ip_conntrack_tuple_hash *
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__ip_conntrack_find(const struct ip_conntrack_tuple *tuple,
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const struct ip_conntrack *ignored_conntrack);
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extern void ip_conntrack_flush(void);
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/* It's confirmed if it is, or has been in the hash table. */
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static inline int is_confirmed(struct ip_conntrack *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 is_dying(struct ip_conntrack *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 ip_conntrack_htable_size;
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extern int ip_conntrack_checksum;
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#define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
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#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
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#include <linux/notifier.h>
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#include <linux/interrupt.h>
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struct ip_conntrack_ecache {
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struct ip_conntrack *ct;
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unsigned int events;
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};
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DECLARE_PER_CPU(struct ip_conntrack_ecache, ip_conntrack_ecache);
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#define CONNTRACK_ECACHE(x) (__get_cpu_var(ip_conntrack_ecache).x)
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extern struct atomic_notifier_head ip_conntrack_chain;
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extern struct atomic_notifier_head ip_conntrack_expect_chain;
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static inline int ip_conntrack_register_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&ip_conntrack_chain, nb);
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}
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static inline int ip_conntrack_unregister_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_unregister(&ip_conntrack_chain, nb);
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}
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static inline int
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ip_conntrack_expect_register_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&ip_conntrack_expect_chain, nb);
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}
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static inline int
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ip_conntrack_expect_unregister_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_unregister(&ip_conntrack_expect_chain,
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nb);
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}
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extern void ip_ct_deliver_cached_events(const struct ip_conntrack *ct);
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extern void __ip_ct_event_cache_init(struct ip_conntrack *ct);
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static inline void
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ip_conntrack_event_cache(enum ip_conntrack_events event,
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const struct sk_buff *skb)
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{
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struct ip_conntrack *ct = (struct ip_conntrack *)skb->nfct;
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struct ip_conntrack_ecache *ecache;
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local_bh_disable();
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ecache = &__get_cpu_var(ip_conntrack_ecache);
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if (ct != ecache->ct)
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__ip_ct_event_cache_init(ct);
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ecache->events |= event;
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local_bh_enable();
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}
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static inline void ip_conntrack_event(enum ip_conntrack_events event,
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struct ip_conntrack *ct)
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{
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if (is_confirmed(ct) && !is_dying(ct))
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atomic_notifier_call_chain(&ip_conntrack_chain, event, ct);
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}
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static inline void
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ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
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struct ip_conntrack_expect *exp)
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{
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atomic_notifier_call_chain(&ip_conntrack_expect_chain, event, exp);
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}
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#else /* CONFIG_IP_NF_CONNTRACK_EVENTS */
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static inline void ip_conntrack_event_cache(enum ip_conntrack_events event,
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const struct sk_buff *skb) {}
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static inline void ip_conntrack_event(enum ip_conntrack_events event,
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struct ip_conntrack *ct) {}
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static inline void ip_ct_deliver_cached_events(const struct ip_conntrack *ct) {}
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static inline void
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ip_conntrack_expect_event(enum ip_conntrack_expect_events event,
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struct ip_conntrack_expect *exp) {}
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#endif /* CONFIG_IP_NF_CONNTRACK_EVENTS */
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#ifdef CONFIG_IP_NF_NAT_NEEDED
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static inline int ip_nat_initialized(struct ip_conntrack *conntrack,
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enum ip_nat_manip_type manip)
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{
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if (manip == IP_NAT_MANIP_SRC)
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return test_bit(IPS_SRC_NAT_DONE_BIT, &conntrack->status);
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return test_bit(IPS_DST_NAT_DONE_BIT, &conntrack->status);
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}
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#endif /* CONFIG_IP_NF_NAT_NEEDED */
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#endif /* __KERNEL__ */
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#endif /* _IP_CONNTRACK_H */
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