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2010-02-15netfilter: nf_conntrack: add support for "conntrack zones"Patrick McHardy
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>
2010-02-15netfilter: nf_conntrack: pass template to l4proto ->error() handlerPatrick McHardy
The error handlers might need the template to get the conntrack zone introduced in the next patches to perform a conntrack lookup. Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-02-15netfilter: xtables: add const qualifiersJan Engelhardt
This should make it easier to remove redundant arguments later. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-02-15netfilter: xtables: constify args in compat copying functionsJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-02-15netfilter: iptables: remove unused function argumentsJan Engelhardt
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-02-11netfilter: xtables: fix mangle tablesAlexey Dobriyan
In POST_ROUTING hook, calling dev_net(in) is going to oops. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-02-10netfilter: xtables: generate initial table on-demandJan Engelhardt
The static initial tables are pretty large, and after the net namespace has been instantiated, they just hang around for nothing. This commit removes them and creates tables on-demand at runtime when needed. Size shrinks by 7735 bytes (x86_64). Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-02-10netfilter: xtables: use xt_table for hook instantiationJan Engelhardt
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>
2010-02-10netfilter: xtables: compact table hook functions (2/2)Jan Engelhardt
The calls to ip6t_do_table only show minimal differences, so it seems like a good cleanup to merge them to a single one too. Space saving obtained by both patches: 6807725->6807373 ("Total" column from `size -A`.) Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-02-10netfilter: xtables: compact table hook functions (1/2)Jan Engelhardt
This patch combines all the per-hook functions in a given table into a single function. Together with the 2nd patch, further simplifications are possible up to the point of output code reduction. Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
2010-02-10Merge branch 'master' of /repos/git/net-next-2.6Patrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-02-09Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-02-08netfilter: xtables: compat out of scope fixAlexey Dobriyan
As per C99 6.2.4(2) when temporary table data goes out of scope, the behaviour is undefined: if (compat) { struct foo tmp; ... private = &tmp; } [dereference private] Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: stable@kernel.org Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-02-03netfilter: nf_conntrack: support conntrack templatesPatrick McHardy
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>
2010-02-03netfilter: add struct net * to target parametersPatrick McHardy
Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-01-28netns xfrm: ipcomp6 supportAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-28netns xfrm: xfrm6_tunnel in netnsAlexey Dobriyan
I'm not sure about rcu stuff near kmem cache destruction: * checks for non-empty hashes look bogus, they're done _before_ rcu_berrier() * unregistering netns ops is done before kmem_cache destoy (as it should), and unregistering involves rcu barriers by itself So it looks nothing should be done. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-28netns xfrm: fixup xfrm6_tunnel error propagationAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-28Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-01-26ipv6: conntrack: Add member of user to nf_ct_frag6_queue structureShan Wei
The commit 0b5ccb2(title:ipv6: reassembly: use seperate reassembly queues for conntrack and local delivery) has broken the saddr&&daddr member of nf_ct_frag6_queue when creating new queue. And then hash value generated by nf_hashfn() was not equal with that generated by fq_find(). So, a new received fragment can't be inserted to right queue. The patch fixes the bug with adding member of user to nf_ct_frag6_queue structure. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-24netns xfrm: deal with dst entries in netnsAlexey Dobriyan
GC is non-existent in netns, so after you hit GC threshold, no new dst entries will be created until someone triggers cleanup in init_net. Make xfrm4_dst_ops and xfrm6_dst_ops per-netns. This is not done in a generic way, because it woule waste (AF_MAX - 2) * sizeof(struct dst_ops) bytes per-netns. Reorder GC threshold initialization so it'd be done before registering XFRM policies. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-23net: constify MIB name tablesAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-23Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
2010-01-20IPv6: reassembly: replace magic number with macro definitionsShan Wei
Use macro to define high/low thresh value, refer to IPV6_FRAG_TIMEOUT. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-01-20netfilter: nf_conntrack_ipv6: delete the redundant macro definitionsShan Wei
The following three macro definitions are never used, so delete them. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Patrick McHardy <kaber@trash.net>
2010-01-18netfilter: xtables: add struct xt_mtdtor_param::netAlexey Dobriyan
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>
2010-01-18netfilter: xtables: add struct xt_mtchk_param::netAlexey Dobriyan
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>
2010-01-17net: spread __net_init, __net_exitAlexey Dobriyan
__net_init/__net_exit are apparently not going away, so use them to full extent. In some cases __net_init was removed, because it was called from __net_exit code. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-17tcp: account SYN-ACK timeouts & retransmissionsOctavian Purdila
Currently we don't increment SYN-ACK timeouts & retransmissions although we do increment the same stats for SYN. We seem to have lost the SYN-ACK accounting with the introduction of tcp_syn_recv_timer (commit 2248761e in the netdev-vger-cvs tree). This patch fixes this issue. In the process we also rename the v4/v6 syn/ack retransmit functions for clarity. We also add a new request_socket operations (syn_ack_timeout) so we can keep code in inet_connection_sock.c protocol agnostic. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-13ipv6: skb_dst() can be NULL in ipv6_hop_jumbo().David S. Miller
This fixes CERT-FI FICORA #341748 Discovered by Olli Jarva and Tuomo Untinen from the CROSS project at Codenomicon Ltd. Just like in CVE-2007-4567, we can't rely upon skb_dst() being non-NULL at this point. We fixed that in commit e76b2b2567b83448c2ee85a896433b96150c92e6 ("[IPV6]: Do no rely on skb->dst before it is assigned.") However commit 483a47d2fe794328d29950fe00ce26dd405d9437 ("ipv6: added net argument to IP6_INC_STATS_BH") put a new version of the same bug into this function. Complicating analysis further, this bug can only trigger when network namespaces are enabled in the build. When namespaces are turned off, the dev_net() does not evaluate it's argument, so the dereference would not occur. So, for a long time, namespaces couldn't be turned on unless SYSFS was disabled. Therefore, this code has largely been disabled except by people turning it on explicitly for namespace development. With help from Eugene Teo <eugene@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-10Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/benet/be_cmds.h include/linux/sysctl.h
2010-01-10NET: ipv6, remove unnecessary checkJiri Slaby
Stanse found a potential null dereference in snmp6_unregister_dev. There is a check for idev being NULL, but it is dereferenced earlier. But idev cannot be NULL when passed to snmp6_unregister_dev, so remove the test. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: "David S. Miller" <davem@davemloft.net> Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Cc: "Pekka Savola (ipv6)" <pekkas@netcore.fi> Cc: James Morris <jmorris@namei.org> Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org> Cc: Patrick McHardy <kaber@trash.net> Cc: netdev@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-08net/ipv6/tcp_ipv6.c: Use compressed IPv6 addressJoe Perches
Use "[compressed ipv6]:port" form suggested by: http://tools.ietf.org/id/draft-ietf-6man-text-addr-representation-03.txt Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-06ip: fix mc_loop checks for tunnels with multicast outer addressesOctavian Purdila
When we have L3 tunnels with different inner/outer families (i.e. IPV4/IPV6) which use a multicast address as the outer tunnel destination address, multicast packets will be loopbacked back to the sending socket even if IP*_MULTICAST_LOOP is set to disabled. The mc_loop flag is present in the family specific part of the socket (e.g. the IPv4 or IPv4 specific part). setsockopt sets the inner family mc_loop flag. When the packet is pushed through the L3 tunnel it will eventually be processed by the outer family which if different will check the flag in a different part of the socket then it was set. Signed-off-by: Octavian Purdila <opurdila@ixiacom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-23net: Add rtnetlink init_rcvwnd to set the TCP initial receive windowlaurent chavey
Add rtnetlink init_rcvwnd to set the TCP initial receive window size advertised by passive and active TCP connections. The current Linux TCP implementation limits the advertised TCP initial receive window to the one prescribed by slow start. For short lived TCP connections used for transaction type of traffic (i.e. http requests), bounding the advertised TCP initial receive window results in increased latency to complete the transaction. Support for setting initial congestion window is already supported using rtnetlink init_cwnd, but the feature is useless without the ability to set a larger TCP initial receive window. The rtnetlink init_rcvwnd allows increasing the TCP initial receive window, allowing TCP connection to advertise larger TCP receive window than the ones bounded by slow start. Signed-off-by: Laurent Chavey <chavey@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-18ipv6: fix an oops when force unload ipv6 moduleYang Hongyang
When I do an ipv6 module force unload,I got the following oops: #rmmod -f ipv6 ------------[ cut here ]------------ kernel BUG at mm/slub.c:2969! invalid opcode: 0000 [#1] SMP last sysfs file: /sys/devices/pci0000:00/0000:00:11.0/0000:02:03.0/net/eth2/ifindex Modules linked in: ipv6(-) dm_multipath uinput ppdev tpm_tis tpm tpm_bios pcspkr pcnet32 mii parport_pc i2c_piix4 parport i2c_core floppy mptspi mptscsih mptbase scsi_transport_spi Pid: 2530, comm: rmmod Tainted: G R 2.6.32 #2 440BX Desktop Reference Platform/VMware Virtual Platform EIP: 0060:[<c04b73f2>] EFLAGS: 00010246 CPU: 0 EIP is at kfree+0x6a/0xdd EAX: 00000000 EBX: c09e86bc ECX: c043e4dd EDX: c14293e0 ESI: e141f1d8 EDI: e140fc31 EBP: dec58ef0 ESP: dec58ed0 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process rmmod (pid: 2530, ti=dec58000 task=decb1940 task.ti=dec58000) Stack: c14293e0 00000282 df624240 c0897d08 c09e86bc c09e86bc e141f1d8 dec58f1c <0> dec58f00 e140fc31 c09e84c4 e141f1bc dec58f14 c0689d21 dec58f1c e141f1bc <0> 00000000 dec58f2c c0689eff c09e84d8 c09e84d8 e141f1bc bff33a90 dec58f38 Call Trace: [<e140fc31>] ? ipv6_frags_exit_net+0x22/0x32 [ipv6] [<c0689d21>] ? ops_exit_list+0x19/0x3d [<c0689eff>] ? unregister_pernet_operations+0x2a/0x51 [<c0689f70>] ? unregister_pernet_subsys+0x17/0x24 [<e140fbfe>] ? ipv6_frag_exit+0x21/0x32 [ipv6] [<e141a361>] ? inet6_exit+0x47/0x122 [ipv6] [<c045f5de>] ? sys_delete_module+0x198/0x1f6 [<c04a8acf>] ? remove_vma+0x57/0x5d [<c070f63f>] ? do_page_fault+0x2e7/0x315 [<c0403218>] ? sysenter_do_call+0x12/0x28 Code: 86 00 00 00 40 c1 e8 0c c1 e0 05 01 d0 89 45 e0 66 83 38 00 79 06 8b 40 0c 89 45 e0 8b 55 e0 8b 02 84 c0 78 14 66 a9 00 c0 75 04 <0f> 0b eb fe 8b 45 e0 e8 35 15 fe ff eb 5d 8b 45 04 8b 55 e0 89 EIP: [<c04b73f2>] kfree+0x6a/0xdd SS:ESP 0068:dec58ed0 ---[ end trace 4475d1a5b0afa7e5 ]--- It's because in ip6_frags_ns_sysctl_register, "table" only alloced when "net" is not equals to "init_net".So when we free "table" in ip6_frags_ns_sysctl_unregister,we should check this first. This patch fix the problem. Signed-off-by: Yang Hongyang <yanghy@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-18netns: fix net.ipv6.route.gc_min_interval_ms in netnsAlexey Dobriyan
sysctl table was copied, all right, but ->data for net.ipv6.route.gc_min_interval_ms was not reinitialized for "!= &init_net" case. In init_net everthing works by accident due to correct ->data initialization in source table. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-15Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-2.6
2009-12-15tcp: Revert per-route SACK/DSACK/TIMESTAMP changes.David S. Miller
It creates a regression, triggering badness for SYN_RECV sockets, for example: [19148.022102] Badness at net/ipv4/inet_connection_sock.c:293 [19148.022570] NIP: c02a0914 LR: c02a0904 CTR: 00000000 [19148.023035] REGS: eeecbd30 TRAP: 0700 Not tainted (2.6.32) [19148.023496] MSR: 00029032 <EE,ME,CE,IR,DR> CR: 24002442 XER: 00000000 [19148.024012] TASK = eee9a820[1756] 'privoxy' THREAD: eeeca000 This is likely caused by the change in the 'estab' parameter passed to tcp_parse_options() when invoked by the functions in net/ipv4/tcp_minisocks.c But even if that is fixed, the ->conn_request() changes made in this patch series is fundamentally wrong. They try to use the listening socket's 'dst' to probe the route settings. The listening socket doesn't even have a route, and you can't get the right route (the child request one) until much later after we setup all of the state, and it must be done by hand. This stuff really isn't ready, so the best thing to do is a full revert. This reverts the following commits: f55017a93f1a74d50244b1254b9a2bd7ac9bbf7d 022c3f7d82f0f1c68018696f2f027b87b9bb45c2 1aba721eba1d84a2defce45b950272cee1e6c72a cda42ebd67ee5fdf09d7057b5a4584d36fe8a335 345cda2fd695534be5a4494f1b59da9daed33663 dc343475ed062e13fc260acccaab91d7d80fd5b2 05eaade2782fb0c90d3034fd7a7d5a16266182bb 6a2a2d6bf8581216e08be15fcb563cfd6c430e1e Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-15netfilter: fix crashes in bridge netfilter caused by fragment jumpsPatrick McHardy
When fragments from bridge netfilter are passed to IPv4 or IPv6 conntrack and a reassembly queue with the same fragment key already exists from reassembling a similar packet received on a different device (f.i. with multicasted fragments), the reassembled packet might continue on a different codepath than where the head fragment originated. This can cause crashes in bridge netfilter when a fragment received on a non-bridge device (and thus with skb->nf_bridge == NULL) continues through the bridge netfilter code. Add a new reassembly identifier for packets originating from bridge netfilter and use it to put those packets in insolated queues. Fixes http://bugzilla.kernel.org/show_bug.cgi?id=14805 Reported-and-Tested-by: Chong Qiao <qiaochong@loongson.cn> Signed-off-by: Patrick McHardy <kaber@trash.net>
2009-12-15ipv6: reassembly: use seperate reassembly queues for conntrack and local ↵Patrick McHardy
delivery Currently the same reassembly queue might be used for packets reassembled by conntrack in different positions in the stack (PREROUTING/LOCAL_OUT), as well as local delivery. This can cause "packet jumps" when the fragment completing a reassembled packet is queued from a different position in the stack than the previous ones. Add a "user" identifier to the reassembly queue key to seperate the queues of each caller, similar to what we do for IPv4. Signed-off-by: Patrick McHardy <kaber@trash.net>
2009-12-08tcp: Fix a connect() race with timewait socketsEric Dumazet
First patch changes __inet_hash_nolisten() and __inet6_hash() to get a timewait parameter to be able to unhash it from ehash at same time the new socket is inserted in hash. This makes sure timewait socket wont be found by a concurrent writer in __inet_check_established() Reported-by: kapil dakhane <kdakhane@gmail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-08Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1815 commits) mac80211: fix reorder buffer release iwmc3200wifi: Enable wimax core through module parameter iwmc3200wifi: Add wifi-wimax coexistence mode as a module parameter iwmc3200wifi: Coex table command does not expect a response iwmc3200wifi: Update wiwi priority table iwlwifi: driver version track kernel version iwlwifi: indicate uCode type when fail dump error/event log iwl3945: remove duplicated event logging code b43: fix two warnings ipw2100: fix rebooting hang with driver loaded cfg80211: indent regulatory messages with spaces iwmc3200wifi: fix NULL pointer dereference in pmkid update mac80211: Fix TX status reporting for injected data frames ath9k: enable 2GHz band only if the device supports it airo: Fix integer overflow warning rt2x00: Fix padding bug on L2PAD devices. WE: Fix set events not propagated b43legacy: avoid PPC fault during resume b43: avoid PPC fault during resume tcp: fix a timewait refcnt race ... Fix up conflicts due to sysctl cleanups (dead sysctl_check code and CTL_UNNUMBERED removed) in kernel/sysctl_check.c net/ipv4/sysctl_net_ipv4.c net/ipv6/addrconf.c net/sctp/sysctl.c
2009-12-03tcp: connect() race with timewait reuseEric Dumazet
Its currently possible that several threads issuing a connect() find the same timewait socket and try to reuse it, leading to list corruptions. Condition for bug is that these threads bound their socket on same address/port of to-be-find timewait socket, and connected to same target. (SO_REUSEADDR needed) To fix this problem, we could unhash timewait socket while holding ehash lock, to make sure lookups/changes will be serialized. Only first thread finds the timewait socket, other ones find the established socket and return an EADDRNOTAVAIL error. This second version takes into account Evgeniy's review and makes sure inet_twsk_put() is called outside of locked sections. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-03Merge branch 'master' of ↵David S. Miller
git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
2009-12-03net: Batch inet_twsk_purgeEric W. Biederman
This function walks the whole hashtable so there is no point in passing it a network namespace. Instead I purge all timewait sockets from dead network namespaces that I find. If the namespace is one of the once I am trying to purge I am guaranteed no new timewait sockets can be formed so this will get them all. If the namespace is one I am not acting for it might form a few more but I will call inet_twsk_purge again and shortly to get rid of them. In any even if the network namespace is dead timewait sockets are useless. Move the calls of inet_twsk_purge into batch_exit routines so that if I am killing a bunch of namespaces at once I will just call inet_twsk_purge once and save a lot of redundant unnecessary work. My simple 4k network namespace exit test the cleanup time dropped from roughly 8.2s to 1.6s. While the time spent running inet_twsk_purge fell to about 2ms. 1ms for ipv4 and 1ms for ipv6. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-03net: Allow fib_rule_unregister to batchEric W. Biederman
Refactor the code so fib_rules_register always takes a template instead of the actual fib_rules_ops structure that will be used. This is required for network namespace support so 2 out of the 3 callers already do this, it allows the error handling to be made common, and it allows fib_rules_unregister to free the template for hte caller. Modify fib_rules_unregister to use call_rcu instead of syncrhonize_rcu to allw multiple namespaces to be cleaned up in the same rcu grace period. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-03net 04/05: fib_rules: allow to delete local rulePatrick McHardy
commit d124356ce314fff22a047ea334379d5105b2d834 Author: Patrick McHardy <kaber@trash.net> Date: Thu Dec 3 12:16:35 2009 +0100 net: fib_rules: allow to delete local rule Allow to delete the local rule and recreate it with a higher priority. This can be used to force packets with a local destination out on the wire instead of routing them to loopback. Additionally this patch allows to recreate rules with a priority of 0. Combined with the previous patch to allow oif classification, a socket can be bound to the desired interface and packets routed to the wire like this: # move local rule to lower priority ip rule add pref 1000 lookup local ip rule del pref 0 # route packets of sockets bound to eth0 to the wire independant # of the destination address ip rule add pref 100 oif eth0 lookup 100 ip route add default dev eth0 table 100 Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-02TCPCT part 1g: Responder Cookie => InitiatorWilliam Allen Simpson
Parse incoming TCP_COOKIE option(s). Calculate <SYN,ACK> TCP_COOKIE option. Send optional <SYN,ACK> data. This is a significantly revised implementation of an earlier (year-old) patch that no longer applies cleanly, with permission of the original author (Adam Langley): http://thread.gmane.org/gmane.linux.network/102586 Requires: TCPCT part 1a: add request_values parameter for sending SYNACK TCPCT part 1b: generate Responder Cookie secret TCPCT part 1c: sysctl_tcp_cookie_size, socket option TCP_COOKIE_TRANSACTIONS TCPCT part 1d: define TCP cookie option, extend existing struct's TCPCT part 1e: implement socket option TCP_COOKIE_TRANSACTIONS TCPCT part 1f: Initiator Cookie => Responder Signed-off-by: William.Allen.Simpson@gmail.com Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-02TCPCT part 1d: define TCP cookie option, extend existing struct'sWilliam Allen Simpson
Data structures are carefully composed to require minimal additions. For example, the struct tcp_options_received cookie_plus variable fits between existing 16-bit and 8-bit variables, requiring no additional space (taking alignment into consideration). There are no additions to tcp_request_sock, and only 1 pointer in tcp_sock. This is a significantly revised implementation of an earlier (year-old) patch that no longer applies cleanly, with permission of the original author (Adam Langley): http://thread.gmane.org/gmane.linux.network/102586 The principle difference is using a TCP option to carry the cookie nonce, instead of a user configured offset in the data. This is more flexible and less subject to user configuration error. Such a cookie option has been suggested for many years, and is also useful without SYN data, allowing several related concepts to use the same extension option. "Re: SYN floods (was: does history repeat itself?)", September 9, 1996. http://www.merit.net/mail.archives/nanog/1996-09/msg00235.html "Re: what a new TCP header might look like", May 12, 1998. ftp://ftp.isi.edu/end2end/end2end-interest-1998.mail These functions will also be used in subsequent patches that implement additional features. Requires: TCPCT part 1a: add request_values parameter for sending SYNACK TCPCT part 1b: generate Responder Cookie secret TCPCT part 1c: sysctl_tcp_cookie_size, socket option TCP_COOKIE_TRANSACTIONS Signed-off-by: William.Allen.Simpson@gmail.com Signed-off-by: David S. Miller <davem@davemloft.net>
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