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* conntrackd: implement selective flushing for `-t' and `-F' commandsPablo Neira Ayuso2012-07-301-1/+1
| | | | | | | | | | | | | | | | | | | This patch changes the current behaviour of `-t' and `-F' commands, that results in flushing the kernel conntrack table. With this patch, the entries that match the Filter clauses in conntrackd.conf are ignored. This fixes the situation in which some local ssh connection to the firewall is lost during the failover (since `-t' is invoked from the primary-backup.sh script). Note that the Filter clause tells what entries have to be ignored, ie. the entries that do not need to be replicated. It makes sense not to flush entries that are not replicated (usually traffic to the local firewall). Reported-by: Gaurav Sinha <gaurav.sinha@vyatta.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: fix commit operation, needs to be synchronousPablo Neira Ayuso2012-07-051-2/+2
| | | | | | | | | | While adding the expectation support for conntrackd, I accidentally broke synchrony in 'conntrackd -c' command. Basically, conntrackd -c should not return control to the shell until the cache has been committed. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add bugtrap notice in case of flush while commit in progressPablo Neira Ayuso2012-07-051-0/+18
| | | | | | | | | | Flushing the external cache, ie. conntrackd -f, while commit is in progress is not allowed anymore, ie. conntrackd -c. Note that conntrackd -c is synchronous. Thus, it returns control to the caller once the commit has finished. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: support `-i exp -x' and `-e exp -x' optionsPablo Neira Ayuso2012-01-221-0/+12
| | | | | | | | | | This patch allows you to dump the internal and external expectation cache in XML. % conntrackd -i exp -x <flow><layer3 protonum="2" protoname="ipv4"><expected><src>192.168.1.135</src><dst>130.89.148.12</dst></expected><mask><src>255.255.255.255</src><dst>255.255.255.255</dst></mask><master><src>192.168.1.135</src><dst>130.89.148.12</dst></master></layer3><layer4 protonum="6" protoname="tcp"><expected><sport>0</sport><dport>9082</dport></expected><mask><sport>0</sport><dport>65535</dport></mask><master><sport>50518</sport><dport>21</dport></master></layer4><meta><helper-name>ftp</helper-name></meta></flow> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: support for expectation synchronizationPablo Neira Ayuso2012-01-101-17/+148
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support to synchronize expectations between firewalls. This addition aims to re-use as much as possible of the existing infrastructure for stability reasons. The expectation support has been tested with the FTP helper. This extension requires libnetfilter_conntrack 1.0.0. If this is the first time you're playing with conntrackd, I *strongly* recommend you to get working setup of conntrackd without expectation support before as described in the documentation. Then, enabling expectation support is rather easy. To know more about expectations, if you're not familiar with them, I suggest you to read: "Netfilter's Connection Tracking System" http://people.netfilter.org/pablo/docs/login.pdf Reprinted from ;login: The Magazine of USENIX, vol. 31, no. 3 (Berkeley, CA: USENIX Association, 2006, pp40-45.) In short, expectations allow one Linux firewall to filter multi-flow traffic like FTP, SIP and H.323. In my testbed, there are two firewalls in a primary-backup configuration running keepalived. The use a couple of floating cluster IP address (192.168.0.100 and 192.168.1.100) that are used by the client. These firewalls protect one FTP server (192.168.1.2) that will be accessed by one client. In ASCII art, it looks like this: 192.168.0.100 192.168.1.100 eth1 eth2 fw-1 / \ FTP -- client ------ ------ server -- 192.168.0.2 \ / 192.168.1.2 fw-2 This is the rule-set for the firewalls: -A POSTROUTING -t nat -s 192.168.0.2/32 -d 192.168.1.2/32 -j SNAT --to-source 192.168.1.100 -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -m state --state INVALID -j DROP -A FORWARD -m state --state RELATED -j ACCEPT -A FORWARD -i eth2 -m state --state ESTABLISHED -j ACCEPT -A FORWARD -i eth1 -p tcp -m tcp --dport 21 --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j ACCEPT -A FORWARD -i eth1 -p tcp -m state --state ESTABLISHED -j ACCEPT -A FORWARD -m state --state INVALID -j LOG --log-prefix "invalid: " The following steps detail how to check that the expectation support works fine for conntrackd: 1) You have to enable the expectation support in the configuration file with the following option: Sync { ... Options { ExpectationSync { ftp sip h323 } } } This enables expectation synchronization for the FTP, SIP and H.323 helpers. You can alternatively use: Sync { ... Options { ExpectationSync On } } To enable expectation synchronization for all helpers. 2) Make sure you have loaded the FTP helper in both firewalls. root@fw1# modprobe nf_conntrack_ftp root@fw2# modprobe nf_conntrack_ftp 3) Switch to the client. Start one FTP control connection to one server that is protected by the firewalls, enter passive mode: (term-1) user@client$ nc 192.168.1.2 21 220 dummy FTP server USER anonymous 331 Please specify the password. PASS nothing 230 Login successful. PASV 227 Entering Passive Mode (192,168,1,2,163,11). This means that port 163*256+11=41739 will be used for the data traffic. Read this if you are not familiar with the FTP protocol: http://www.freefire.org/articles/ftpexample.php 3) Switch to fw-1 (primary) to check that the expectation is in the internal cache. root@fw1# conntrackd -i exp proto=6 src=192.168.0.2 dst=192.168.1.2 sport=0 dport=41739 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.0.2 master-dst=192.168.1.2 sport=36390 dport=21 [active since 5s] 4) Switch to fw-2 (backup) to check that the expectation has been successfully replicated. root@fw2# conntrackd -e exp proto=6 src=192.168.0.2 dst=192.168.1.2 sport=0 dport=41739 mask-src=255.255.255.255 mask-dst=255.255.255.255 sport=0 dport=65535 master-src=192.168.0.2 master-dst=192.168.1.2 sport=36390 dport=21 [active since 8s] 5) Make the primary firewall fw-1 fail. Now fw-2 becomes primary. 6) Switch to fw-2 (primary) to commit the external cache into the kernel. root@fw2# conntrackd -c exp The logs should display that the commit was successful: root@fw2# tail -100f /var/log/conntrackd.log [Wed Dec 7 22:16:31 2011] (pid=19195) [notice] committing external cache: expectations [Wed Dec 7 22:16:31 2011] (pid=19195) [notice] Committed 1 new entries [Wed Dec 7 22:16:31 2011] (pid=19195) [notice] commit has taken 0.000366 seconds 7) Switch to the client. Open a new terminal and connect to the port that has been announced by the server: (term-2) user@client$ nc -vvv 192.168.1.2 41739 (UNKNOWN) [192.168.1.2] 41739 (?) open 8) Switch to term-1 and ask for the file listing: [...] 227 Entering Passive Mode (192,168,1,2,163,11). LIST 9) Switch to term-2, it should display the listing. That means everything has worked fine. You may want to try disabling the expectation support and repeating the steps to check that *it does not work* without the state-synchronization. You can also display expectation statistics by means of: root@fwX# conntrackd -s exp This update requires no changes in the primary-backup.sh script that is used by the HA manager to interact with conntrackd. Thus, we provide a backward compatible command line interface. Regarding the Filter clause and expectations, we use the master conntrack to filter expectation events. The filtering is performed in user-space. No kernel-space filtering support for expectations yet (this support should go in libnetfilter_conntrack at some point). This patch also includes support to disable caching and to allow direct injection of expectations. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: minor cleanup for commitPablo Neira Ayuso2012-01-101-0/+8
| | | | | | Comestical cleanup for better code readability. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: generalize local handler actionsPablo Neira Ayuso2012-01-101-8/+8
| | | | | | | This patch prepares the introduction of actions with the expectation table. Mostly renamings. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: generalize/cleanup network message building/parsingPablo Neira Ayuso2012-01-101-14/+30
| | | | | | | | | | | | | | | | | | This patch generalizes the network message building and parsing to prepare the upcoming expectation support. Basically, it renames: - NET_T_STATE_* by NET_T_STATE_CT_*, as I plan to add NET_T_STATE_EXP_* - BUILD_NETMSG by BUILD_NETMSG_FROM_CT, and build_payload by ct2msg. I plan to add exp2msg. - parse_payload by msg2ct, since I plan to add msg2exp. - modify object_status_to_network_type to prepare the support of expectations. - add prefix ct_ to all parsing functions in parse.c, as we will have similar functions to convert messages to expectation objects. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: generalize external handlers to prepare expectation supportPablo Neira Ayuso2012-01-101-11/+11
| | | | | | | | | | This patch contains cleanups to prepare the expectation support for external handlers. Mostly renamings. I have also updated the file headers to include Vyatta in the copyright statement. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: generalize caching infrastructurePablo Neira Ayuso2012-01-101-9/+10
| | | | | | | | This patch generalizes the caching infrastructure to store different object types. This patch is the first in the series to prepare support for the synchronization of expectations. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: remove use of deprecated nfct_maxsize()Pablo Neira Ayuso2011-02-181-3/+7
| | | | | | | This patch removes the use of nfct_maxsize() and several abusive stack-based allocations. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* cache: close commit request if we already have one in progressPablo Neira Ayuso2011-02-131-0/+1
| | | | | | | | We close a commit request if there's already one in progress. This patch fixes a problem that may be triggered if two consecutive commit requests are received. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync: don't override initial return value of local handlerPablo Neira Ayuso2011-02-131-8/+4
| | | | Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: replace cryptic `mfrm' by `malformed' in `-s'Mohit Mehta2010-07-091-3/+3
| | | | | | | | | | | Looking at the output of `conntrackd -s`; I didn't know what 'mfrm' meant under the 'message sequence tracking' section so I had to look up the code for this. While doing so, I replaced 'mfrm' with 'malformed' in the output since I thought other users might be confused as well as I was looking at that word. Signed-off-by: Mohit Mehta <mohit.mehta@vyatta.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: fix `conntrackd -c' if external cache is disabledPablo Neira Ayuso2010-02-171-3/+1
| | | | | | | | | | This patch fixes a hung that occurs if you invoke `conntrackd -c' and you have disabled the external cache. Note that `conntrackd -c' does nothing since there is no entries in the external cache to be committed. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add `DisableInternalCache' clausePablo Neira Ayuso2009-10-211-173/+17
| | | | | | | | This patch adds the clause `DisableInternalCache' that allows you to bypass the internal cache. This clause can only be used with the notrack synchronization mode. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add retention queue for TCP errorsPablo Neira Ayuso2009-09-231-1/+4
| | | | | | | | Under stress, the TCP stack may return EAGAIN if there is not space left in the sender buffer. We also enqueue any other error. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add support state-replication based on TCPPablo Neira Ayuso2009-08-231-13/+52
| | | | | | | | This patch adds support for TCP as protocol to replicate state-changes between two daemons. Note that this only makes sense with the notrack mode. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add `DisableExternalCache' clausePablo Neira Ayuso2009-08-191-41/+32
| | | | | | | | | | | This patch adds the clause `DisableExternalCache' that allows you to disable the external cache and to directly inject the entries into the kernel conntrack table. As a result, the CPU consumption of conntrackd increases. This clause can only be used with the FT-FW and the notrack synchronization modes, but not with the alarm mode. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: more robust sanity checking on synchronization messagesPablo Neira Ayuso2009-08-171-3/+8
| | | | | | | | This patch fixes an infinite loop that can occur if a message of zero length is received. Moreover, now we always stop the processing if the message is malformed. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: improve handling of external messagesPablo Neira Ayuso2009-07-191-2/+17
| | | | | | | | | With this patch, a) we set the file descriptors for the synchronization channels as non-blocking, b) we perform more than one recv() call per select() signal on the socket and c) we limit the iteration to the value that EventIterationLimit has set. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: rework commit not to fork a child processPablo Neira Ayuso2009-07-191-13/+25
| | | | | | | | | | | | | | | This patch reworks the commit phase to avoid the forking. This is particularly useful in active-active setups in which one node has to commit the external cache while it is receiving new entries to be added in the external cache. This results in really high commit times due to the penalty of the copy-on-write that fork performs. The default number of steps in one run loop is limited to 64 by now. No option to tune this parameter is still available via the configuration file. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* local: add LOCAL_RET_* return values for UNIX sockets callbacksPablo Neira Ayuso2009-07-171-1/+1
| | | | | | | | This patch adds the LOCAL_RET_* return values. The return value LOCAL_RET_STOLEN which allows to leave a client socket open while waiting for an operation to finish. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add `-s queue' to display queue statisticsPablo Neira Ayuso2009-06-201-0/+3
| | | | | | | | | | | | | | | | | | | | This patch re-introduces `-s queue' but now it displays generic queue statistics. # conntrackd -s queue active queue objects: 0 queue txqueue: current elements: 0 maximum elements: 2147483647 not enough space errors: 0 queue rsqueue: current elements: 72 maximum elements: 128 not enough space errors: 0 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add the name field to queuesPablo Neira Ayuso2009-06-201-1/+1
| | | | | | | | This patch adds the name field to identify the queue by means of a string. This patch is used by the next one that introduces per-queue statistics. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: use a permanent handler for commit operationsPablo Neira Ayuso2009-06-111-22/+13
| | | | | | | | | This patch adds a dedicated commit handler since there is a possible race condition that can happen if the child process ends before we have received all the event messages that the commit request has triggered. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: use a permanent handler for flush operationsPablo Neira Ayuso2009-06-111-21/+2
| | | | | | | | | | | In 6f5666a29cb7cbff08ce926ee1edb84a311ff6ee, I moved the flush operation into a child process and to use a disposable handler to perform flush requests. This patch adds a dedicated flush handler since there is a possible race condition that can happen if the child process ends before we have received all the event messages that the flush request has triggered. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: allow to limit the number of simultaneous child processesPablo Neira Ayuso2009-06-111-6/+8
| | | | | | | | This patch allows to limit the number of simultaneous child processes. This is required by the next patch that replaces disposable handlers to commit and flush with permanent handlers. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: remove the cache write-through policyPablo Neira Ayuso2009-05-231-4/+0
| | | | | | | | | | | | | | This patch removes the cache write-through clause. This feature remained undocumented although some has found it looking at the source code. This feature has remained in the tree for quite some time although it has several limitations. Moreover, it is specifically broken and dangerous for Linux kernels >= 2.6.29 since it generates loops in the synchronization. We do this removal first to prepare the introduction of a feature to bypass the external cache. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: flush operation use the child process and origin infrastructurePablo Neira Ayuso2009-05-231-1/+27
| | | | | | | | | | | | With this patch, the flush operation is performed by a child process. Thus, the parent process digests destroy events that ctnetlink reports back and, thanks to the origin infrastructure, we skip the messy implicit synchronization that are triggered by such events. This patch requires a Linux kernel >= 2.6.29 to benefit from this change, otherwise it has no effect. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: detect where the events comes fromPablo Neira Ayuso2009-05-231-9/+42
| | | | | | | | | | Since Linux kernel 2.6.29, ctnetlink reports the changes that have been done using ctnetlink. With this patch, conntrackd can recognize who is the origin of the event messages. For example, this is interesting to avoid a messy implicit bulk send during the commit of entries. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add child process infrastructurePablo Neira Ayuso2009-05-231-5/+6
| | | | | | | | | | | | | This patch adds a simple infrastructure that allows to account the child processes that have been forked. This also includes a callback handler that can be registered that is called once the child process finishes. We can extended this later to include an alarm to limit the maximum lifetime of a forked child process. This is good to ensure that child processes behave timely. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: fix broken dedicated-link change in multichannel layerPablo Neira Ayuso2009-03-201-12/+5
| | | | | | | This patch fixes a problem that was introduced while adding the multichannel support. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: change `multicast' by `link' for `-s' optionPablo Neira Ayuso2009-03-171-1/+1
| | | | | | | | | This patch obsoletes `-s multicast' by `-s link' to display the dedicated link statistics, as the current dedicated link protocol use can be unicast UDP or multicast. The term "link" is more generic. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: cleanup reminiscent of multicast dependencyPablo Neira Ayuso2009-03-171-2/+2
| | | | | | | | | This patch is a cleanup, it removes a couple of reminiscent references to multicast (as now conntrackd is independent of the protocol used to replicate state-changes, currently supports unicast UDP and multicast). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: save one tab inside switch, cleanupPablo Neira Ayuso2009-03-131-14/+14
| | | | | | This patch saves one tab in the code. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: fix wrong output stats refering lost/malformed packetsPablo Neira Ayuso2009-03-131-3/+3
| | | | | | | | This patch fixes a misleading output that shows the number of lost and malformed packets. Instead, those numbers show the number of the number of lost and malformed messages. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: add abstract layer to make daemon independent of multicastPablo Neira Ayuso2009-03-121-52/+30
| | | | | | | | | This patch reworks conntrackd to make it independent of the protocol used to propagate state-changes. This patch adds the channel layer abstraction, this layer allows you to add support for different protocols like unicast UDP or TIPC. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: rename mcast_iface structure to interfacePablo Neira Ayuso2009-03-091-13/+13
| | | | | | | | | This patch renames the mcast_iface to interface since this nlif handler is not related with multicast itself, but to monitor the link interface used to propagate state-changes. This patch is a cleanup. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: rename mcast_send_sync() to sync_send()Pablo Neira Ayuso2009-03-091-7/+7
| | | | | | | | This patch is a cleanup. It renames the function mcast_send_sync() to sync_send() since the function itself is not related to multicast anymore (it enqueues state-changes to the upper layer). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: fix compilation issue in gentoo due to missing include limits.hPablo Neira Ayuso2009-02-211-0/+1
| | | | | | | | | This patch adds include limits.h to mcast.c and sync-mode.c. Why Gentoo maintainers did not report me the problem? :( http://bugs.gentoo.org/show_bug.cgi?id=256497 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: remove obsolete debug() and debug_ct() callsPablo Neira Ayuso2009-02-201-20/+6
| | | | | | | This patch removes debug() and debug_ct(), I haven't use the debugging information that these functions provide in years. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: change current link if message is correctPablo Neira Ayuso2009-02-201-3/+10
| | | | | | | This patch makes conntrackd change the current dedicated link if the message is correct, ie. neither malformed nor out-of-sync. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* conntrackd: add `-f internal' and `-f external' optionsPablo Neira Ayuso2009-02-151-0/+10
| | | | | | | | This patch allows flushing the internal and/or the external cache. The `-f' with no extra parameters still works to flush both the internal and the external cache. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: use resync handler for polling instead of dump handlerPablo Neira Ayuso2009-02-141-12/+14
| | | | | | | | This patch moves the polling logic into the resync handler. The dump handler action depended on the daemon working mode (polling or event-driven) resulting in an inconsistent behaviour. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* sync-mode: flush also internal cache after reset PurgeTimeoutPablo Neira Ayuso2009-02-081-0/+1
| | | | | | | | | | Currently, the daemon sends a flush request to the kernel-space. With lots of entries and NetlinkOverrunResync disabled, the daemon remains in an inconsistent state due to an overrun produced by the flush report to userspace. With this patch, the daemon also flush its internal cache after the kernel flush request. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: re-work polling strategyPablo Neira Ayuso2009-02-061-11/+17
| | | | | | | | This patch improves the polling support included in 0.9.10. The polling now consists of getting the state table, wait for PollSecs, then purge obsolete entries, and so on. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: change behaviour of `-t' optionPablo Neira Ayuso2009-01-251-5/+18
| | | | | | | | | | With this patch, the `-t' option adds an alarm that will flush the cache after CONFIG(purge_timeout) seconds specified in the config file. This looks much cleaner and more performance that looping on the entire conntrack table to set the new timeout of every single entry. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: remove register_fds hooksPablo Neira Ayuso2009-01-171-19/+12
| | | | | | | This patch moves the file descriptor registration after the initialization instead of having a specific hook for this. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* src: rename overrun handler to resync handlerPablo Neira Ayuso2009-01-171-6/+6
| | | | | | | | | This patch is a cleanup. The overrun handler is actually a way to resynchronize against the conntrack kernel table. The name overrun was used because it was initially its purpose. The new naming shows its genericity. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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