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This patches fixes two problems:
- If we failt to update an entry, we remove it and try again. This
happens when we still have an entry in a final state like TIME_WAIT
while we see a new connection (SYN_SENT) with the same tuple. In
this particular case, we fail to update since some status bits are
only settable, but not unsettable.
- If we hit ETIME in an update, we have to go over the creation
patch, otherwise we hit ENOENT in the next run.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Commit master entries before related ones to avoid ENOENT errors.
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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Do not report ENOENT to log files, this may confuse users. There's a
race condition when shortening the timers and handling the destroy
messages. However, this problem is not serious as the point of the
shortening is to reduce the lifetime of the conntracks. If the conntrack
is dying, there's no point to shorten their lifetime anymore :)
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch adds the new option `-t' for conntrackd. This option shortens
the value of the timeout for the cached entries that lives in the
kernel. This option is particularly useful to remove the zombie
established entries that remain in kernel if the user tests the platform
by forcing the takeover from one to another node several times.
We currently use the value of CommitTimeout which is sane for it. Adding
a new option does not seem to add more flexibility IMO.
Once we get the patches to notify user changes via ctnetlink and the
netlink flag NLM_F_ECHO works, we may directly invoke a massive purge of
the entries, however, such solution would still need evaluation.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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This patch hides information that may confuse users while they are
diagnosing problems in their setup. For example, we hide entries
that are schedule to expire - from the user side, they are already
destroyed entries; and we show in the counters the real active entries,
not all that are stored in the caches.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Some users are reporting ETIME errors in the update. This happens
when you try to update a conntrack that is expiring. To avoid this
problem, we retry once at least. We do similar for ENOMEM errors,
although only users in virtual machines have reported this AFAIK.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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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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Simplify logging infrastructure
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import only required C headers and put local headers on top to check
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Fix tons of gcc warnings
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add missing function prototypes
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o minor irrelevant fixes for uncommon error paths and fix several typos
o use LOG_INFO for connection logging, use LOG_NOTICE for other information
o minor error handling updates
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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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- add len field to nethdr
- implement buffered send/recv to batch messages
- stop using netlink format for network messages: use similar TLV-based format
- reduce synchronization messages size up to 60%
- introduce periodic alive messages for sync-nack protocol
- timeslice alarm implementation: remove alarm pthread, remove locking
- simplify debugging functions: use nfct_snprintf instead
- remove major use of libnfnetlink functions: use libnetfilter_conntrack API
- deprecate conntrackd -F, use conntrack -F instead
- major rework of the network infrastructure: much simple, less messy
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- remove several debug calls
- create a child to dispatch dump requests: this will help to simplify the
current locking schema. Later.
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o remove reminiscents of delay destroy message and relax transitions
o remove confusing StripNAT parameter: NAT support enabled by default
o relax event tracking: *_update callbacks use cache_update_force
o use wraparound-aware functions after/before/between
o lots of cleanups
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- empty debug_ct function if DEBUG_CT is not set
- revisit overrun handler: this is a hard battle, just try to do our best here, call Patrick :)
- explicit warning message when netlink_buffer_max_growth is reached
- fix silly bug in stats-mode when dumping in XML format
- fix UDP handler for conntrack
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- flush nack queue in the conntrackd -f path
- do not increase add_fail counter for EEXIST errors
- cleanup sync-nack code
- improve mcast_recv_netmsg: sanity check before checksumming!
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chain
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