mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-05 10:29:37 +00:00
![Krzysztof Piotr Oledzki](/assets/img/avatar_default.png)
Initially netfilter has had 64bit counters for conntrack-based accounting, but it was changed in 2.6.14 to save memory. Unfortunately in-kernel 64bit counters are still required, for example for "connbytes" extension. However, 64bit counters waste a lot of memory and it was not possible to enable/disable it runtime. This patch: - reimplements accounting with respect to the extension infrastructure, - makes one global version of seq_print_acct() instead of two seq_print_counters(), - makes it possible to enable it at boot time (for CONFIG_SYSCTL/CONFIG_SYSFS=n), - makes it possible to enable/disable it at runtime by sysctl or sysfs, - extends counters from 32bit to 64bit, - renames ip_conntrack_counter -> nf_conn_counter, - enables accounting code unconditionally (no longer depends on CONFIG_NF_CT_ACCT), - set initial accounting enable state based on CONFIG_NF_CT_ACCT - removes buggy IPCT_COUNTER_FILLING event handling. If accounting is enabled newly created connections get additional acct extend. Old connections are not changed as it is not possible to add a ct_extend area to confirmed conntrack. Accounting is performed for all connections with acct extend regardless of a current state of "net.netfilter.nf_conntrack_acct". Signed-off-by: Krzysztof Piotr Oledzki <ole@ans.pl> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
172 lines
4.4 KiB
C
172 lines
4.4 KiB
C
#ifndef _NF_CONNTRACK_COMMON_H
|
|
#define _NF_CONNTRACK_COMMON_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 has fixed timeout. */
|
|
IPS_FIXED_TIMEOUT_BIT = 10,
|
|
IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_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),
|
|
|
|
/* Counter highest bit has been set, unused */
|
|
IPCT_COUNTER_FILLING_BIT = 11,
|
|
IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT),
|
|
|
|
/* Mark is set */
|
|
IPCT_MARK_BIT = 12,
|
|
IPCT_MARK = (1 << IPCT_MARK_BIT),
|
|
|
|
/* NAT sequence adjustment */
|
|
IPCT_NATSEQADJ_BIT = 13,
|
|
IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT),
|
|
|
|
/* Secmark is set */
|
|
IPCT_SECMARK_BIT = 14,
|
|
IPCT_SECMARK = (1 << IPCT_SECMARK_BIT),
|
|
};
|
|
|
|
enum ip_conntrack_expect_events {
|
|
IPEXP_NEW_BIT = 0,
|
|
IPEXP_NEW = (1 << IPEXP_NEW_BIT),
|
|
};
|
|
|
|
#ifdef __KERNEL__
|
|
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;
|
|
};
|
|
|
|
/* call to create an explicit dependency on nf_conntrack. */
|
|
extern void need_conntrack(void);
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _NF_CONNTRACK_COMMON_H */
|