![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
315 lines
8.7 KiB
C
315 lines
8.7 KiB
C
#ifndef _IP_CONNTRACK_H
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#define _IP_CONNTRACK_H
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/* Connection state tracking for netfilter. This is separated from,
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but required by, the NAT layer; it can also be used by an iptables
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extension. */
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enum ip_conntrack_info
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{
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/* Part of an established connection (either direction). */
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IP_CT_ESTABLISHED,
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/* Like NEW, but related to an existing connection, or ICMP error
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(in either direction). */
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IP_CT_RELATED,
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/* Started a new connection to track (only
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IP_CT_DIR_ORIGINAL); may be a retransmission. */
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IP_CT_NEW,
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/* >= this indicates reply direction */
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IP_CT_IS_REPLY,
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/* Number of distinct IP_CT types (no NEW in reply dirn). */
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IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
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};
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/* Bitset representing status of connection. */
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enum ip_conntrack_status {
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/* It's an expected connection: bit 0 set. This bit never changed */
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IPS_EXPECTED_BIT = 0,
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IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
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/* We've seen packets both ways: bit 1 set. Can be set, not unset. */
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IPS_SEEN_REPLY_BIT = 1,
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IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
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/* Conntrack should never be early-expired. */
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IPS_ASSURED_BIT = 2,
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IPS_ASSURED = (1 << IPS_ASSURED_BIT),
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/* Connection is confirmed: originating packet has left box */
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IPS_CONFIRMED_BIT = 3,
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IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
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/* Connection needs src nat in orig dir. This bit never changed. */
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IPS_SRC_NAT_BIT = 4,
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IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
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/* Connection needs dst nat in orig dir. This bit never changed. */
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IPS_DST_NAT_BIT = 5,
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IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
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/* Both together. */
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IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
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/* Connection needs TCP sequence adjusted. */
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IPS_SEQ_ADJUST_BIT = 6,
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IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
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/* NAT initialization bits. */
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IPS_SRC_NAT_DONE_BIT = 7,
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IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
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IPS_DST_NAT_DONE_BIT = 8,
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IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
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/* Both together */
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IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
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};
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#ifdef __KERNEL__
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#include <linux/config.h>
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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_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_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_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_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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#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_counter
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{
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u_int64_t packets;
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u_int64_t bytes;
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};
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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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/* 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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#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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unsigned long mark;
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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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#ifdef CONFIG_IP_NF_NAT_NEEDED
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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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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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extern inline void ip_conntrack_put(struct ip_conntrack *ct);
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/* call to create an explicit dependency on ip_conntrack. */
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extern void need_ip_conntrack(void);
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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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/* Refresh conntrack for this many jiffies */
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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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/* 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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/* 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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extern unsigned int ip_conntrack_htable_size;
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struct ip_conntrack_stat
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{
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unsigned int searched;
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unsigned int found;
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unsigned int new;
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unsigned int invalid;
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unsigned int ignore;
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unsigned int delete;
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unsigned int delete_list;
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unsigned int insert;
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unsigned int insert_failed;
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unsigned int drop;
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unsigned int early_drop;
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unsigned int error;
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unsigned int expect_new;
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unsigned int expect_create;
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unsigned int expect_delete;
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};
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#define CONNTRACK_STAT_INC(count) (__get_cpu_var(ip_conntrack_stat).count++)
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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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