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authorPablo Neira Ayuso <pablo@netfilter.org>2008-07-22 12:13:43 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2008-07-22 12:13:43 +0200
commit77b1fdb824eb45213df4f57224e8e799fed43ded (patch)
tree282a395e7ab2d8fe8cfe12f34e6d09535d067101 /doc/sync/notrack
parent2de606c2458067c48e72058a31af384574cf9c70 (diff)
Major rework of the user-space event filtering
This patch reworks the user-space filtering. Although we have kernel-space filtering since Linux kernel >= 2.6.26, we keep userspace filtering to ensure backward compatibility. Moreover, this patch prepares the implementation of the kernel-space filtering via libnetfilter_conntrack's high-level berkeley socket filter API. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'doc/sync/notrack')
-rw-r--r--doc/sync/notrack/node1/conntrackd.conf65
-rw-r--r--doc/sync/notrack/node2/conntrackd.conf65
2 files changed, 82 insertions, 48 deletions
diff --git a/doc/sync/notrack/node1/conntrackd.conf b/doc/sync/notrack/node1/conntrackd.conf
index 1185351..724183a 100644
--- a/doc/sync/notrack/node1/conntrackd.conf
+++ b/doc/sync/notrack/node1/conntrackd.conf
@@ -121,30 +121,47 @@ General {
# Increase the socket buffer up to maximum if required
#
SocketBufferSizeMaxGrown 655355
-}
-#
-# Ignore traffic for a certain set of IP's: Usually
-# all the IP assigned to the firewall since local
-# traffic must be ignored, just forwarded connections
-# are worth to replicate
-#
-IgnoreTrafficFor {
- IPv4_address 127.0.0.1 # loopback
- IPv4_address 192.168.0.1
- IPv4_address 192.168.1.1
- IPv4_address 192.168.100.100 # dedicated link ip
- IPv4_address 192.168.0.100 # virtual IP 1
- IPv4_address 192.168.1.100 # virtual IP 2
-}
+ #
+ # Event filtering: This clause allows you to filter certain traffic,
+ # There are currently three filter-sets: Protocol, Address and
+ # State. The filter is attached to an action that can be: Accept or
+ # Ignore. Thus, you can define the event filtering policy of the
+ # filter-sets in positive or negative logic depending on your needs.
+ #
+ Filter {
+ #
+ # Accept only certain protocols: You may want to replicate
+ # the state of flows depending on their layer 4 protocol.
+ #
+ Protocol Accept {
+ TCP
+ }
-#
-# Do not replicate certain protocol traffic
-#
-IgnoreProtocol {
- UDP
- ICMP
- IGMP
- VRRP
- # numeric numbers also valid
+ #
+ # Ignore traffic for a certain set of IP's: Usually all the
+ # IP assigned to the firewall since local traffic must be
+ # ignored, only forwarded connections are worth to replicate.
+ #
+ Address Ignore {
+ IPv4_address 127.0.0.1 # loopback
+ IPv4_address 192.168.0.1
+ IPv4_address 192.168.1.1
+ IPv4_address 192.168.100.100 # dedicated link ip
+ IPv4_address 192.168.0.100 # virtual IP 1
+ IPv4_address 192.168.1.100 # virtual IP 2
+ }
+
+ #
+ # Uncomment this line below if you want to filter by flow state.
+ # This option introduces a trade-off in the replication: it
+ # reduces CPU consumption at the cost of having lazy backup
+ # firewall replicas. The existing TCP states are: SYN_SENT,
+ # SYN_RECV, ESTABLISHED, FIN_WAIT, CLOSE_WAIT, LAST_ACK,
+ # TIME_WAIT, CLOSED, LISTEN.
+ #
+ # State Accept {
+ # ESTABLISHED CLOSED TIME_WAIT CLOSE_WAIT for TCP
+ # }
+ }
}
diff --git a/doc/sync/notrack/node2/conntrackd.conf b/doc/sync/notrack/node2/conntrackd.conf
index 7881d46..cbf5cee 100644
--- a/doc/sync/notrack/node2/conntrackd.conf
+++ b/doc/sync/notrack/node2/conntrackd.conf
@@ -120,30 +120,47 @@ General {
# Increase the socket buffer up to maximum if required
#
SocketBufferSizeMaxGrown 655355
-}
-#
-# Ignore traffic for a certain set of IP's: Usually
-# all the IP assigned to the firewall since local
-# traffic must be ignored, just forwarded connections
-# are worth to replicate
-#
-IgnoreTrafficFor {
- IPv4_address 127.0.0.1 # loopback
- IPv4_address 192.168.0.2
- IPv4_address 192.168.1.2
- IPv4_address 192.168.100.200 # dedicated link ip
- IPv4_address 192.168.0.200 # virtual IP 1
- IPv4_address 192.168.1.200 # virtual IP 2
-}
+ #
+ # Event filtering: This clause allows you to filter certain traffic,
+ # There are currently three filter-sets: Protocol, Address and
+ # State. The filter is attached to an action that can be: Accept or
+ # Ignore. Thus, you can define the event filtering policy of the
+ # filter-sets in positive or negative logic depending on your needs.
+ #
+ Filter {
+ #
+ # Accept only certain protocols: You may want to replicate
+ # the state of flows depending on their layer 4 protocol.
+ #
+ Protocol Accept {
+ TCP
+ }
-#
-# Do not replicate certain protocol traffic
-#
-IgnoreProtocol {
- UDP
- ICMP
- IGMP
- VRRP
- # numeric numbers also valid
+ #
+ # Ignore traffic for a certain set of IP's: Usually all the
+ # IP assigned to the firewall since local traffic must be
+ # ignored, only forwarded connections are worth to replicate.
+ #
+ Address Ignore {
+ IPv4_address 127.0.0.1 # loopback
+ IPv4_address 192.168.0.2
+ IPv4_address 192.168.1.2
+ IPv4_address 192.168.100.200 # dedicated link ip
+ IPv4_address 192.168.0.100 # virtual IP 1
+ IPv4_address 192.168.1.100 # virtual IP 2
+ }
+
+ #
+ # Uncomment this line below if you want to filter by flow state.
+ # This option introduces a trade-off in the replication: it
+ # reduces CPU consumption at the cost of having lazy backup
+ # firewall replicas. The existing TCP states are: SYN_SENT,
+ # SYN_RECV, ESTABLISHED, FIN_WAIT, CLOSE_WAIT, LAST_ACK,
+ # TIME_WAIT, CLOSED, LISTEN.
+ #
+ # State Accept {
+ # ESTABLISHED CLOSED TIME_WAIT CLOSE_WAIT for TCP
+ # }
+ }
}