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* netfilter: xtables: stackptr should be percpuEric Dumazet2010-05-311-1/+1
| | | | | | | | | | | | | commit f3c5c1bfd4 (netfilter: xtables: make ip_tables reentrant) introduced a performance regression, because stackptr array is shared by all cpus, adding cache line ping pongs. (16 cpus share a 64 bytes cache line) Fix this using alloc_percpu() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-By: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: fix description of expected checkentry return code on xt_targetLuciano Coelho2010-05-201-1/+1
| | | | | | | | | The text describing the return codes that are expected on calls to checkentry() was incorrect. Instead of returning true or false, or an error code, it should return 0 or an error code. Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: xtables: change hotdrop pointer to direct modificationJan Engelhardt2010-05-111-1/+4
| | | | | | | | | | | | Since xt_action_param is writable, let's use it. The pointer to 'bool hotdrop' always worried (8 bytes (64-bit) to write 1 byte!). Surprisingly results in a reduction in size: text data bss filename 5457066 692730 357892 vmlinux.o-prev 5456554 692730 357892 vmlinux.o Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* netfilter: xtables: deconstify struct xt_action_param for matchesJan Engelhardt2010-05-111-1/+1
| | | | | | | | | In future, layer-3 matches will be an xt module of their own, and need to set the fragoff and thoff fields. Adding more pointers would needlessy increase memory requirements (esp. so for 64-bit, where pointers are wider). Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* netfilter: xtables: substitute temporary defines by final nameJan Engelhardt2010-05-111-2/+0
| | | | Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* netfilter: xtables: combine struct xt_match_param and xt_target_paramJan Engelhardt2010-05-111-25/+17
| | | | | | | | | | | | | | The structures carried - besides match/target - almost the same data. It is possible to combine them, as extensions are evaluated serially, and so, the callers end up a little smaller. text data bss filename -15318 740 104 net/ipv4/netfilter/ip_tables.o +15286 740 104 net/ipv4/netfilter/ip_tables.o -15333 540 152 net/ipv6/netfilter/ip6_tables.o +15269 540 152 net/ipv6/netfilter/ip6_tables.o Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* netfilter: x_tables: rectify XT_FUNCTION_MAXNAMELEN usageJan Engelhardt2010-04-271-8/+6
| | | | | | | | | | | | There has been quite a confusion in userspace about XT_FUNCTION_MAXNAMELEN; because struct xt_entry_match used MAX-1, userspace would have to do an awkward MAX-2 for maximum length checking (due to '\0'). This patch adds a new define that matches the definition of XT_TABLE_MAXNAMELEN - being the size of the actual struct member, not one off. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: nf_conntrack: extend with extra stat counterJesper Dangaard Brouer2010-04-231-0/+1
| | | | | | | | | | I suspect an unfortunatly series of events occuring under a DDoS attack, in function __nf_conntrack_find() nf_contrack_core.c. Adding a stats counter to see if the search is restarted too often. Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk> Signed-off-by: Patrick McHardy <kaber@trash.net>
* Merge branch 'master' of /repos/git/net-next-2.6Patrick McHardy2010-04-201-1/+1
|\ | | | | | | | | | | | | | | | | Conflicts: Documentation/feature-removal-schedule.txt net/ipv6/netfilter/ip6t_REJECT.c net/netfilter/xt_limit.c Signed-off-by: Patrick McHardy <kaber@trash.net>
| * netfilter: ctnetlink: fix reliable event delivery if message building failsPablo Neira Ayuso2010-03-201-1/+1
| | | | | | | | | | | | | | | | | | This patch fixes a bug that allows to lose events when reliable event delivery mode is used, ie. if NETLINK_BROADCAST_SEND_ERROR and NETLINK_RECV_NO_ENOBUFS socket options are set. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* | netfilter: xt_TEE: resolve oif using netdevice notifiersPatrick McHardy2010-04-201-0/+3
| | | | | | | | | | | | | | | | | | Replace the runtime oif name resolving by netdevice notifier based resolving. When an oif is given, a netdevice notifier is registered to resolve the name on NETDEV_REGISTER or NETDEV_CHANGE and unresolve it again on NETDEV_UNREGISTER or NETDEV_CHANGE to a different name. Signed-off-by: Patrick McHardy <kaber@trash.net>
* | netfilter: xtables: make ip_tables reentrantJan Engelhardt2010-04-191-0/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, the table traverser stores return addresses in the ruleset itself (struct ip6t_entry->comefrom). This has a well-known drawback: the jumpstack is overwritten on reentry, making it necessary for targets to return absolute verdicts. Also, the ruleset (which might be heavy memory-wise) needs to be replicated for each CPU that can possibly invoke ip6t_do_table. This patch decouples the jumpstack from struct ip6t_entry and instead puts it into xt_table_info. Not being restricted by 'comefrom' anymore, we can set up a stack as needed. By default, there is room allocated for two entries into the traverser. arp_tables is not touched though, because there is just one/two modules and further patches seek to collapse the table traverser anyhow. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
* | netfilter: xtables: inclusion of xt_TEEJan Engelhardt2010-04-192-0/+10
| | | | | | | | | | | | | | | | | | | | xt_TEE can be used to clone and reroute a packet. This can for example be used to copy traffic at a router for logging purposes to another dedicated machine. References: http://www.gossamer-threads.com/lists/iptables/devel/68781 Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
* | netfilter: xtables: make XT_ALIGN() usable in exported headers by exporting ↵Alexey Dobriyan2010-04-131-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | __ALIGN_KERNEL() XT_ALIGN() was rewritten through ALIGN() by commit 42107f5009da223daa800d6da6904d77297ae829 "netfilter: xtables: symmetric COMPAT_XT_ALIGN definition". ALIGN() is not exported in userspace headers, which created compile problem for tc(8) and will create problem for iptables(8). We can't export generic looking name ALIGN() but we can export less generic __ALIGN_KERNEL() (suggested by Ben Hutchings). Google knows nothing about __ALIGN_KERNEL(). COMPAT_XT_ALIGN() changed for symmetry. Reported-by: Andreas Henriksson <andreas@fatal.se> Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* | netfilter: xtables: change xt_target.checkentry return typeJan Engelhardt2010-03-251-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Restore function signatures from bool to int so that we can report memory allocation failures or similar using -ENOMEM rather than always having to pass -EINVAL back. // <smpl> @@ type bool; identifier check, par; @@ -bool check +int check (struct xt_tgchk_param *par) { ... } // </smpl> Minus the change it does to xt_ct_find_proto. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* | netfilter: xtables: change xt_match.checkentry return typeJan Engelhardt2010-03-251-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Restore function signatures from bool to int so that we can report memory allocation failures or similar using -ENOMEM rather than always having to pass -EINVAL back. This semantic patch may not be too precise (checking for functions that use xt_mtchk_param rather than functions referenced by xt_match.checkentry), but reviewed, it produced the intended result. // <smpl> @@ type bool; identifier check, par; @@ -bool check +int check (struct xt_mtchk_param *par) { ... } // </smpl> Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* | netfilter: xtables: consolidate code into xt_request_find_matchJan Engelhardt2010-03-251-0/+2
| | | | | | | | Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* | netfilter: xtables: reduce holes in struct xt_targetJan Engelhardt2010-03-181-1/+1
| | | | | | | | | | | | This will save one full padding chunk (8 bytes on x86_64) per target. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* | netfilter: xtables: remove almost-unused xt_match_param.data memberJan Engelhardt2010-03-181-3/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | This member is taking up a "long" per match, yet is only used by one module out of the roughly 90 modules, ip6t_hbh. ip6t_hbh can be restructured a little to accomodate for the lack of the .data member. This variant uses checking the par->match address, which should avoid having to add two extra functions, including calls, i.e. (hbh_mt6: call hbhdst_mt6(skb, par, NEXTHDR_OPT), dst_mt6: call hbhdst_mt6(skb, par, NEXTHDR_DEST)) Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* | netfilter: update documentation fields of x_tables.hJan Engelhardt2010-03-181-2/+8
| | | | | | | | Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* | Merge branch 'master' of ../nf-2.6Patrick McHardy2010-03-181-2/+1
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| * | netfilter: include/linux/netfilter/nf_conntrack_tuple_common.h: Checkpatch ↵Andrea Gelmini2010-03-081-2/+1
| |/ | | | | | | | | | | | | | | | | | | cleanup include/linux/netfilter/nf_conntrack_tuple_common.h:5: ERROR: open brace '{' following enum go on the same line Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Patrick McHardy <kaber@trash.net>
* | netfilter: xt_recent: check for unsupported user space flagsTim Gardner2010-03-171-0/+3
| | | | | | | | | | Signed-off-by: Tim Gardner <tim.gardner@canonical.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* | netfilter: xt_recent: add an entry reaperTim Gardner2010-03-171-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | One of the problems with the way xt_recent is implemented is that there is no efficient way to remove expired entries. Of course, one can write a rule '-m recent --remove', but you have to know beforehand which entry to delete. This commit adds reaper logic which checks the head of the LRU list when a rule is invoked that has a '--seconds' value and XT_RECENT_REAP set. If an entry ceases to accumulate time stamps, then it will eventually bubble to the top of the LRU list where it is then reaped. Signed-off-by: Tim Gardner <tim.gardner@canonical.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* | netfilter: xtables: merge xt_CONNMARK into xt_connmarkJan Engelhardt2010-03-172-21/+12
| | | | | | | | Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* | netfilter: xtables: merge xt_MARK into xt_markJan Engelhardt2010-03-172-5/+5
|/ | | | | | | | | | | | | | | | | | | | | | Two arguments for combining the two: - xt_mark is pretty useless without xt_MARK - the actual code is so small anyway that the kmod metadata and the module in its loaded state totally outweighs the combined actual code size. i586-before: -rw-r--r-- 1 jengelh users 3821 Feb 10 01:01 xt_MARK.ko -rw-r--r-- 1 jengelh users 2592 Feb 10 00:04 xt_MARK.o -rw-r--r-- 1 jengelh users 3274 Feb 10 01:01 xt_mark.ko -rw-r--r-- 1 jengelh users 2108 Feb 10 00:05 xt_mark.o text data bss dec hex filename 354 264 0 618 26a xt_MARK.o 223 176 0 399 18f xt_mark.o And the runtime size is like 14 KB. i586-after: -rw-r--r-- 1 jengelh users 3264 Feb 18 17:28 xt_mark.o Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* netfilter: xtables: replace XT_MATCH_ITERATE macroJan Engelhardt2010-02-241-1/+9
| | | | | | | | The macro is replaced by a list.h-like foreach loop. This makes the code more inspectable. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: xtables: replace XT_ENTRY_ITERATE macroJan Engelhardt2010-02-241-0/+9
| | | | | | | | The macro is replaced by a list.h-like foreach loop. This makes the code much more inspectable. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: CONFIG_COMPAT: allow delta to exceed 32767Florian Westphal2010-02-151-1/+1
| | | | | | | | | | | | | | | | with 32 bit userland and 64 bit kernels, it is unlikely but possible that insertion of new rules fails even tough there are only about 2000 iptables rules. This happens because the compat delta is using a short int. Easily reproducible via "iptables -m limit" ; after about 2050 rules inserting new ones fails with -ELOOP. Note that compat_delta included 2 bytes of padding on x86_64, so structure size remains the same. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: ctnetlink: add zone supportPatrick McHardy2010-02-151-0/+2
| | | | | | Parse and dump the conntrack zone in ctnetlink. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: nf_conntrack: add support for "conntrack zones"Patrick McHardy2010-02-151-1/+1
| | | | | | | | | | | | | Normally, each connection needs a unique identity. Conntrack zones allow to specify a numerical zone using the CT target, connections in different zones can use the same identity. Example: iptables -t raw -A PREROUTING -i veth0 -j CT --zone 1 iptables -t raw -A OUTPUT -o veth1 -j CT --zone 1 Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: xtables: constify args in compat copying functionsJan Engelhardt2010-02-151-6/+6
| | | | Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* netfilter: nf_conntrack_sip: add T.38 FAX supportPatrick McHardy2010-02-111-0/+1
| | | | Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: nf_nat_sip: add TCP supportPatrick McHardy2010-02-111-0/+1
| | | | | | Add support for mangling TCP SIP packets. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: nf_conntrack_sip: add TCP supportPatrick McHardy2010-02-111-1/+2
| | | | | | | | | | Add TCP support, which is mandated by RFC3261 for all SIP elements. SIP over TCP is similar to UDP, except that messages are delimited by Content-Length: headers and multiple messages may appear in one packet. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: nf_conntrack_sip: pass data offset to NAT functionsPatrick McHardy2010-02-111-4/+10
| | | | | | | | | | When using TCP multiple SIP messages might be present in a single packet. A following patch will parse them by setting the dptr to the beginning of each message. The NAT helper needs to reload the dptr value after mangling the packet however, so it needs to know the offset of the message to the beginning of the packet. Signed-off-by: Patrick McHardy <kaber@trash.net>
* Merge branch 'master' of git://dev.medozas.de/linuxPatrick McHardy2010-02-101-0/+4
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| * netfilter: xtables: use xt_table for hook instantiationJan Engelhardt2010-02-101-0/+4
| | | | | | | | | | | | | | | | | | | | | | | | The respective xt_table structures already have most of the metadata needed for hook setup. Add a 'priority' field to struct xt_table so that xt_hook_link() can be called with a reduced number of arguments. So should we be having more tables in the future, it comes at no static cost (only runtime, as before) - space saved: 6807373->6806555. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
* | netfilter: xtables: symmetric COMPAT_XT_ALIGN definitionAlexey Dobriyan2010-02-101-4/+9
| | | | | | | | | | | | | | | | | | Rewrite COMPAT_XT_ALIGN in terms of dummy structure hack. Compat counters logically have nothing to do with it. Use ALIGN() macro while I'm at it for same types. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* | netfilter: xtables: consistent struct compat_xt_counters definitionAlexey Dobriyan2010-02-101-5/+1
|/ | | | | | | | | There is compat_u64 type which deals with different u64 type alignment on different compat-capable platforms, so use it and removed some hardcoded assumptions. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: xtables: add CT targetPatrick McHardy2010-02-032-0/+18
| | | | | | | | | | Add a new target for the raw table, which can be used to specify conntrack parameters for specific connections, f.i. the conntrack helper. The target attaches a "template" connection tracking entry to the skb, which is used by the conntrack core when initializing a new conntrack. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: nf_conntrack: support conntrack templatesPatrick McHardy2010-02-031-0/+4
| | | | | | | | | | | Support initializing selected parameters of new conntrack entries from a "conntrack template", which is a specially marked conntrack entry attached to the skb. Currently the helper and the event delivery masks can be initialized this way. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: ctnetlink: support selective event deliveryPatrick McHardy2010-02-031-0/+18
| | | | | | | | | | Add two masks for conntrack end expectation events to struct nf_conntrack_ecache and use them to filter events. Their default value is "all events" when the event sysctl is on and "no events" when it is off. A following patch will add specific initializations. Expectation events depend on the ecache struct of their master conntrack. Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: add struct net * to target parametersPatrick McHardy2010-02-031-0/+2
| | | | Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: xtables: CONFIG_COMPAT reduxAlexey Dobriyan2010-02-021-4/+8
| | | | | | | | | | | | | Ifdef out struct nf_sockopt_ops::compat_set struct nf_sockopt_ops::compat_get struct xt_match::compat_from_user struct xt_match::compat_to_user struct xt_match::compatsize to make structures smaller on COMPAT=n kernels. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: xtables: add struct xt_mtdtor_param::netAlexey Dobriyan2010-01-181-0/+1
| | | | | | | | | | Add ->net to match destructor list like ->net in constructor list. Make sure it's set in ebtables/iptables/ip6tables, this requires to propagate netns up to *_unregister_table(). Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: xtables: add struct xt_mtchk_param::netAlexey Dobriyan2010-01-181-0/+1
| | | | | | | | | | | | Some complex match modules (like xt_hashlimit/xt_recent) want netns information at constructor and destructor time. We propably can play games at match destruction time, because netns can be passed in object, but I think it's cleaner to explicitly pass netns. Add ->net, make sure it's set from ebtables/iptables/ip6tables code. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* netfilter: nfnetlink: netns supportAlexey Dobriyan2010-01-131-4/+4
| | | | | | | Make nfnl socket per-petns. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
* Merge branch 'master' of ↵David S. Miller2009-12-031-0/+3
|\ | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
| * netfilter: nf_ct_tcp: improve out-of-sync situation in TCP trackingPablo Neira Ayuso2009-11-231-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Without this patch, if we receive a SYN packet from the client while the firewall is out-of-sync, we let it go through. Then, if we see the SYN/ACK reply coming from the server, we destroy the conntrack entry and drop the packet to trigger a new retransmission. Then, the retransmision from the client is used to start a new clean session. This patch improves the current handling. Basically, if we see an unexpected SYN packet, we annotate the TCP options. Then, if we see the reply SYN/ACK, this means that the firewall was indeed out-of-sync. Therefore, we set a clean new session from the existing entry based on the annotated values. This patch adds two new 8-bits fields that fit in a 16-bits gap of the ip_ct_tcp structure. This patch is particularly useful for conntrackd since the asynchronous nature of the state-synchronization allows to have backup nodes that are not perfect copies of the master. This helps to improve the recovery under some worst-case scenarios. I have tested this by creating lots of conntrack entries in wrong state: for ((i=1024;i<65535;i++)); do conntrack -I -p tcp -s 192.168.2.101 -d 192.168.2.2 --sport $i --dport 80 -t 800 --state ESTABLISHED -u ASSURED,SEEN_REPLY; done Then, I make some TCP connections: $ echo GET / | nc 192.168.2.2 80 The events show the result: [UPDATE] tcp 6 60 SYN_RECV src=192.168.2.101 dst=192.168.2.2 sport=33220 dport=80 src=192.168.2.2 dst=192.168.2.101 sport=80 dport=33220 [ASSURED] [UPDATE] tcp 6 432000 ESTABLISHED src=192.168.2.101 dst=192.168.2.2 sport=33220 dport=80 src=192.168.2.2 dst=192.168.2.101 sport=80 dport=33220 [ASSURED] [UPDATE] tcp 6 120 FIN_WAIT src=192.168.2.101 dst=192.168.2.2 sport=33220 dport=80 src=192.168.2.2 dst=192.168.2.101 sport=80 dport=33220 [ASSURED] [UPDATE] tcp 6 30 LAST_ACK src=192.168.2.101 dst=192.168.2.2 sport=33220 dport=80 src=192.168.2.2 dst=192.168.2.101 sport=80 dport=33220 [ASSURED] [UPDATE] tcp 6 120 TIME_WAIT src=192.168.2.101 dst=192.168.2.2 sport=33220 dport=80 src=192.168.2.2 dst=192.168.2.101 sport=80 dport=33220 [ASSURED] and tcpdump shows no retransmissions: 20:47:57.271951 IP 192.168.2.101.33221 > 192.168.2.2.www: S 435402517:435402517(0) win 5840 <mss 1460,sackOK,timestamp 4294961827 0,nop,wscale 6> 20:47:57.273538 IP 192.168.2.2.www > 192.168.2.101.33221: S 3509927945:3509927945(0) ack 435402518 win 5792 <mss 1460,sackOK,timestamp 235681024 4294961827,nop,wscale 4> 20:47:57.273608 IP 192.168.2.101.33221 > 192.168.2.2.www: . ack 3509927946 win 92 <nop,nop,timestamp 4294961827 235681024> 20:47:57.273693 IP 192.168.2.101.33221 > 192.168.2.2.www: P 435402518:435402524(6) ack 3509927946 win 92 <nop,nop,timestamp 4294961827 235681024> 20:47:57.275492 IP 192.168.2.2.www > 192.168.2.101.33221: . ack 435402524 win 362 <nop,nop,timestamp 235681024 4294961827> 20:47:57.276492 IP 192.168.2.2.www > 192.168.2.101.33221: P 3509927946:3509928082(136) ack 435402524 win 362 <nop,nop,timestamp 235681025 4294961827> 20:47:57.276515 IP 192.168.2.101.33221 > 192.168.2.2.www: . ack 3509928082 win 108 <nop,nop,timestamp 4294961828 235681025> 20:47:57.276521 IP 192.168.2.2.www > 192.168.2.101.33221: F 3509928082:3509928082(0) ack 435402524 win 362 <nop,nop,timestamp 235681025 4294961827> 20:47:57.277369 IP 192.168.2.101.33221 > 192.168.2.2.www: F 435402524:435402524(0) ack 3509928083 win 108 <nop,nop,timestamp 4294961828 235681025> 20:47:57.279491 IP 192.168.2.2.www > 192.168.2.101.33221: . ack 435402525 win 362 <nop,nop,timestamp 235681025 4294961828> I also added a rule to log invalid packets, with no occurrences :-) . Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Patrick McHardy <kaber@trash.net>
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