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This patch adds CIDR-based filtering support. The current
implementation is O(n).
This patch also introduces the vector data type which is
used to store the IP address and the network mask.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch changes the current behaviour of the filtering selection.
Up to now, conntrackd has used the kernel version to select the
filtering method based on the following logic: If kernel is >= 2.6.26
we use BSF-based filtering from kernel-space, otherwise, default to
userspace.
However, this filtering method still lacks of IPv6 support and
it requires a patch that got into 2.6.29 to filter IPv6 addresses
from kernel-space. To fix this issue, we default to user-space
filtering and let the user choose the method via the configuration
file.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds the clause PurgeTimeout that sets the new timer
when conntrackd -t is called. This command is particularly useful
when the sysadmin triggers hand-overs between several nodes without
rebooting as it reduces the timers of the remaining entries in
the kernel. Thus, avoiding clashes between new and old entries that
may trigger INVALID packets.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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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>
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add missing string.h required by strdup in config parsing
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This patch introduces the TimeoutDestroy clause to determine how long a conntrack remains in the internal cache once it has been destroy from the kernel table.
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only which is incompatible AFAIK
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has been Max Kellermann and has no issues with relicensing their contributions.
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import only required C headers and put local headers on top to check
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o rename `persistent' mode to `alarm'
o rename `nack' mode to `ftfw'
o Now default synchronization mode is ftfw instead of alarm
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feature is particularly useful for active-active setup without connection persistency, ie. you cannot know which firewall would filter a packet that belongs to a connection.
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- use buffer of MTU size
conntrack:
- better protocol argument checkings
- fix per-protocol filtering, eg. conntrack -[L|E] -p tcp now works
- show per-protocol help, ie. conntrack -h -p tcp
- add alias --src for --orig-src and alias --dst for --orig-dst
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chain
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