2005-08-10 02:30:24 +00:00
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#ifndef _NFNETLINK_H
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#define _NFNETLINK_H
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#include <linux/types.h>
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2007-09-28 21:37:03 +00:00
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#include <linux/netfilter/nfnetlink_compat.h>
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2005-08-15 02:29:52 +00:00
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enum nfnetlink_groups {
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NFNLGRP_NONE,
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#define NFNLGRP_NONE NFNLGRP_NONE
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NFNLGRP_CONNTRACK_NEW,
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#define NFNLGRP_CONNTRACK_NEW NFNLGRP_CONNTRACK_NEW
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NFNLGRP_CONNTRACK_UPDATE,
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#define NFNLGRP_CONNTRACK_UPDATE NFNLGRP_CONNTRACK_UPDATE
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NFNLGRP_CONNTRACK_DESTROY,
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#define NFNLGRP_CONNTRACK_DESTROY NFNLGRP_CONNTRACK_DESTROY
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NFNLGRP_CONNTRACK_EXP_NEW,
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#define NFNLGRP_CONNTRACK_EXP_NEW NFNLGRP_CONNTRACK_EXP_NEW
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NFNLGRP_CONNTRACK_EXP_UPDATE,
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#define NFNLGRP_CONNTRACK_EXP_UPDATE NFNLGRP_CONNTRACK_EXP_UPDATE
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NFNLGRP_CONNTRACK_EXP_DESTROY,
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#define NFNLGRP_CONNTRACK_EXP_DESTROY NFNLGRP_CONNTRACK_EXP_DESTROY
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__NFNLGRP_MAX,
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};
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#define NFNLGRP_MAX (__NFNLGRP_MAX - 1)
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2005-08-10 02:30:24 +00:00
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/* General form of address family dependent message.
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*/
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struct nfgenmsg {
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2009-02-25 23:51:43 +00:00
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__u8 nfgen_family; /* AF_xxx */
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__u8 version; /* nfnetlink version */
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2006-11-08 08:26:51 +00:00
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__be16 res_id; /* resource id */
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2006-08-22 07:43:20 +00:00
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};
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2005-08-10 02:30:24 +00:00
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2005-08-10 02:32:58 +00:00
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#define NFNETLINK_V0 0
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2005-08-10 02:30:24 +00:00
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/* netfilter netlink message types are split in two pieces:
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* 8 bit subsystem, 8bit operation.
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*/
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#define NFNL_SUBSYS_ID(x) ((x & 0xff00) >> 8)
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#define NFNL_MSG_TYPE(x) (x & 0x00ff)
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2005-08-10 02:43:44 +00:00
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/* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS()
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* won't work anymore */
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#define NFNL_SUBSYS_NONE 0
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#define NFNL_SUBSYS_CTNETLINK 1
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#define NFNL_SUBSYS_CTNETLINK_EXP 2
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#define NFNL_SUBSYS_QUEUE 3
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#define NFNL_SUBSYS_ULOG 4
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2009-06-08 15:01:51 +00:00
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#define NFNL_SUBSYS_OSF 5
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2011-02-01 14:20:14 +00:00
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#define NFNL_SUBSYS_IPSET 6
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netfilter: add extended accounting infrastructure over nfnetlink
We currently have two ways to account traffic in netfilter:
- iptables chain and rule counters:
# iptables -L -n -v
Chain INPUT (policy DROP 3 packets, 867 bytes)
pkts bytes target prot opt in out source destination
8 1104 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0
- use flow-based accounting provided by ctnetlink:
# conntrack -L
tcp 6 431999 ESTABLISHED src=192.168.1.130 dst=212.106.219.168 sport=58152 dport=80 packets=47 bytes=7654 src=212.106.219.168 dst=192.168.1.130 sport=80 dport=58152 packets=49 bytes=66340 [ASSURED] mark=0 use=1
While trying to display real-time accounting statistics, we require
to pool the kernel periodically to obtain this information. This is
OK if the number of flows is relatively low. However, in case that
the number of flows is huge, we can spend a considerable amount of
cycles to iterate over the list of flows that have been obtained.
Moreover, if we want to obtain the sum of the flow accounting results
that match some criteria, we have to iterate over the whole list of
existing flows, look for matchings and update the counters.
This patch adds the extended accounting infrastructure for
nfnetlink which aims to allow displaying real-time traffic accounting
without the need of complicated and resource-consuming implementation
in user-space. Basically, this new infrastructure allows you to create
accounting objects. One accounting object is composed of packet and
byte counters.
In order to manipulate create accounting objects, you require the
new libnetfilter_acct library. It contains several examples of use:
libnetfilter_acct/examples# ./nfacct-add http-traffic
libnetfilter_acct/examples# ./nfacct-get
http-traffic = { pkts = 000000000000, bytes = 000000000000 };
Then, you can use one of this accounting objects in several iptables
rules using the new nfacct match (which comes in a follow-up patch):
# iptables -I INPUT -p tcp --sport 80 -m nfacct --nfacct-name http-traffic
# iptables -I OUTPUT -p tcp --dport 80 -m nfacct --nfacct-name http-traffic
The idea is simple: if one packet matches the rule, the nfacct match
updates the counters.
Thanks to Patrick McHardy, Eric Dumazet, Changli Gao for reviewing and
providing feedback for this contribution.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2011-12-23 13:19:50 +00:00
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#define NFNL_SUBSYS_ACCT 7
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2012-02-28 18:13:48 +00:00
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#define NFNL_SUBSYS_CTNETLINK_TIMEOUT 8
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#define NFNL_SUBSYS_COUNT 9
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2005-08-10 02:30:24 +00:00
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#ifdef __KERNEL__
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2005-08-10 02:32:58 +00:00
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#include <linux/netlink.h>
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2005-08-10 02:30:24 +00:00
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#include <linux/capability.h>
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2007-09-28 21:37:03 +00:00
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#include <net/netlink.h>
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2005-08-10 02:30:24 +00:00
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2009-11-04 17:50:58 +00:00
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struct nfnl_callback {
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2005-08-10 02:30:24 +00:00
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int (*call)(struct sock *nl, struct sk_buff *skb,
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2009-08-25 14:07:58 +00:00
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[]);
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2011-07-18 14:08:07 +00:00
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int (*call_rcu)(struct sock *nl, struct sk_buff *skb,
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const struct nlmsghdr *nlh,
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const struct nlattr * const cda[]);
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2007-09-28 21:38:52 +00:00
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const struct nla_policy *policy; /* netlink attribute policy */
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const u_int16_t attr_count; /* number of nlattr's */
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2005-08-10 02:30:24 +00:00
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};
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2009-11-04 17:50:58 +00:00
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struct nfnetlink_subsystem {
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2005-08-10 02:30:24 +00:00
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const char *name;
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2007-09-28 21:15:45 +00:00
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__u8 subsys_id; /* nfnetlink subsystem ID */
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__u8 cb_count; /* number of callbacks */
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const struct nfnl_callback *cb; /* callback for individual types */
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2005-08-10 02:30:24 +00:00
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};
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2007-09-28 21:15:45 +00:00
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extern int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n);
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extern int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n);
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2005-08-10 02:30:24 +00:00
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2010-01-13 15:02:14 +00:00
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extern int nfnetlink_has_listeners(struct net *net, unsigned int group);
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2012-04-15 05:58:06 +00:00
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extern int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigned int group,
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2009-06-03 08:32:06 +00:00
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int echo, gfp_t flags);
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2010-03-16 13:30:21 +00:00
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extern int nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error);
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2010-01-13 15:02:14 +00:00
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extern int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u_int32_t pid, int flags);
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2005-08-10 02:30:24 +00:00
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2008-10-14 18:58:31 +00:00
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extern void nfnl_lock(void);
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extern void nfnl_unlock(void);
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2005-08-10 02:43:44 +00:00
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#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
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MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
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2005-08-10 02:30:24 +00:00
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#endif /* __KERNEL__ */
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#endif /* _NFNETLINK_H */
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