path: root/include/linux/netfilter/nfnetlink.h
diff options
authorPablo Neira Ayuso <pablo@netfilter.org>2011-12-23 14:19:50 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2011-12-25 02:43:03 +0100
commit9413902796f56f6209e19dd54e840ed46950612c (patch)
treed03b478f7b5e11305cebd5ff26e7342dde7456b4 /include/linux/netfilter/nfnetlink.h
parentnetfilter: ctnetlink: get and zero operations must be atomic (diff)
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 * - use flow-based accounting provided by ctnetlink: # conntrack -L tcp 6 431999 ESTABLISHED src= dst= sport=58152 dport=80 packets=47 bytes=7654 src= dst= 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>
Diffstat (limited to 'include/linux/netfilter/nfnetlink.h')
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/netfilter/nfnetlink.h b/include/linux/netfilter/nfnetlink.h
index 74d33861473c..b64454c2f79f 100644
--- a/include/linux/netfilter/nfnetlink.h
+++ b/include/linux/netfilter/nfnetlink.h
@@ -48,7 +48,8 @@ struct nfgenmsg {
#ifdef __KERNEL__