- 10 Oct, 2007 40 commits
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Johannes Berg authored
During receive processing, we select the key long before using it and because there's no locking it is possible that we kfree() the key after having selected it but before using it for crypto operations. Obviously, this is bad. Secondly, during transmit processing, there are two possible races: We have a similar race between select_key() and using it for encryption, but we also have a race here between select_key() and hardware encryption (both when a key is removed.) This patch solves these issues by using RCU: when a key is to be freed, we first remove the pointer from the appropriate places (sdata->keys, sdata->default_key, sta->key) using rcu_assign_pointer() and then synchronize_rcu(). Then, we can safely kfree() the key and remove it from the hardware. There's a window here where the hardware may still be using it for decryption, but we can't work around that without having two hardware callbacks, one to disable the key for RX and one to disable it for TX; but the worst thing that will happen is that we receive a packet decrypted that we don't find a key for any more and then drop it. When we add a key, we first need to upload it to the hardware and then, using rcu_assign_pointer() again, link it into our structures. In the code using keys (TX/RX paths) we use rcu_dereference() to get the key and enclose the whole tx/rx section in a rcu_read_lock() ... rcu_read_unlock() block. Because we've uploaded the key to hardware before linking it into internal structures, we can guarantee that it is valid once get to into tx(). One possible race condition remains, however: when we have hardware acceleration enabled and the driver shuts down the queues, we end up queueing the frame. If now somebody removes the key, the key will be removed from hwaccel and then then driver will be asked to encrypt the frame with a key index that has been removed. Hence, drivers will need to be aware that the hw_key_index they are passed might not be under all circumstances. Most drivers will, however, simply ignore that condition and encrypt the frame with the selected key anyway, this only results in a frame being encrypted with a wrong key or dropped (rightfully) because the key was not valid. There isn't much we can do about it unless we want to walk the pending frame queue every time a key is removed and remove all frames that used it. This race condition, however, will most likely be solved once we add multiqueue support to mac80211 because then frames will be queued further up the stack instead of after being processed. Signed-off-by:
Johannes Berg <johannes@sipsolutions.net> Acked-by:
Michael Wu <flamingice@sourmilk.net> Signed-off-by:
John W. Linville <linville@tuxdriver.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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Johannes Berg authored
Kalle Valo noticed that QoS frames are sent with an invalid QoS control field; this is because we increase the header length but neither initialise the space nor actually have enough space in the header structure for the QoS control field. This patch fixes it by treating the QoS field specially and appending it explicitly, initialising it to zero. Signed-off-by:
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Johannes Berg authored
mac80211 never calls wireless_spy_update so these aren't useful. Signed-off-by:
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Eric Dumazet authored
On loaded/big hosts, rt_check_expire() if of litle use, because it generally breaks out of its main loop because of a jiffies change. It can take a long time (read : timer invocations) to actually scan the whole hash table, freeing unused entries. Converting it to use a workqueue instead of softirq is a nice move because we can allow rt_check_expire() to do the scan it is supposed to do, without hogging the CPU. This has an impact on the average number of entries in cache, reducing ram usage. Cache is more responsive to parameter changes (/proc/sys/net/ipv4/route/gc_timeout and /proc/sys/net/ipv4/route/gc_interval) Note: Maybe the default value of gc_interval (60 seconds) is too high, since this means we actually need 5 (300/60) invocations to scan the whole table. Signed-off-by:
Eric Dumazet <dada1@cosmosbay.com> Signed-off-by:
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Ivo van Doorn authored
Add a documentation file which contains a short description about rfkill with some notes about drivers and the userspace interface. Changes since v1 and v2: - Spellchecking Signed-off-by:
Ivo van Doorn <IvDoorn@gmail.com> Acked-by:
Dmitry Torokhov <dtor@mail.ru> Acked-by:
Randy Dunlap <randy.dunlap@oracle.com>
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Ivo van Doorn authored
This patch will add support for UWB keys to rfkill, support for this has been requested by Inaky. Signed-off-by:
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Ivo van Doorn authored
As Dmitry pointed out earlier, rfkill-input.c doesn't support irda because there are no users and we shouldn't add unrequired KEY_ defines. However, RFKILL_TYPE_IRDA was defined in the rfkill.h header file and would confuse people about whether it is implemented or not. This patch removes IRDA support completely, so it can be added whenever a driver wants the feature. Signed-off-by:
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Eric W. Biederman authored
The problem: proc_net files remember which network namespace the are against but do not remember hold a reference count (as that would pin the network namespace). So we currently have a small window where the reference count on a network namespace may be incremented when opening a /proc file when it has already gone to zero. To fix this introduce maybe_get_net and get_proc_net. maybe_get_net increments the network namespace reference count only if it is greater then zero, ensuring we don't increment a reference count after it has gone to zero. get_proc_net handles all of the magic to go from a proc inode to the network namespace instance and call maybe_get_net on it. PROC_NET the old accessor is removed so that we don't get confused and use the wrong helper function. Then I fix up the callers to use get_proc_net and handle the case case where get_proc_net returns NULL. In that case I return -ENXIO because effectively the network namespace has already gone away so the files we are trying to access don't exist anymore. Signed-off-by:
Eric W. Biederman <ebiederm@xmission.com> Acked-by:
Paul E. McKenney <paulmck@us.ibm.com> Signed-off-by:
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Daniel Lezcano authored
When CONFIG_NET=no, init_net is unresolved because net_namespace.c is not compiled and the include pull init_net definition. This problem was very similar with the ipc namespace where the kernel can be compiled with SYSV ipc out. This patch fix that defining a macro which simply remove init_net initialization from nsproxy namespace aggregator. Compiled and booted on qemu-i386 with CONFIG_NET=no and CONFIG_NET=yes. Signed-off-by:
Daniel Lezcano <dlezcano@fr.ibm.com> Acked-by:
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Jesper Dangaard Brouer authored
This is done in order to, add support to changing the rate table to use the upper-boundry L2T (length to time) value. Currently we use the lower-boundry, which result in under-estimating the actual bandwidth usage. Extend the tc_ratespec struct, with two parameters: 1) "cell_align" that allow adjusting the alignment of the rate table. 2) "overhead" that allow adding a packet overhead before the lookup. Signed-off-by:
Jesper Dangaard Brouer <hawk@comx.dk> Acked-by:
Patrick McHardy <kaber@trash.net> Signed-off-by:
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Jesper Dangaard Brouer authored
Change L2T (length to time) macros, in all rate based schedulers, to call a common function qdisc_l2t() that does the rate table lookup. This function handles if the packet size lookup is larger than the rate table, which often occurs with TSO enabled. Signed-off-by:
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Adrian Bunk authored
This patch makes the following needlessly global variables static: - sctp_memory_pressure - sctp_memory_allocated - sctp_sockets_allocated Signed-off-by:
Adrian Bunk <bunk@kernel.org> Signed-off-by:
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Adrian Bunk authored
sctp_addto_param() can become static. Signed-off-by:
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Adrian Bunk authored
raise_softirq_irqoff no longer has any modular user. Signed-off-by:
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Daniel Lezcano authored
The macro definition is bad. When calling next_net_device with parameter name "dev", the resulting code is: struct net_device *dev = dev and that leads to an unexpected behavior. Especially when llc_core is compiled in, the kernel panics at boot time. The patchset change macro definition with static inline functions as they were defined before. Signed-off-by:
Benjamin Thery <benjamin.thery@bull.net> Signed-off-by:
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Daniel Lezcano authored
The core patchset of the network namespace sent by Eric Biederman does not do dynamic loopback creation. So there is no call to alloc_netdev_mq which fills the network namespace field of the netdevice. This patch assign the loopback to the init network namespace. Signed-off-by:
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Daniel Lezcano authored
Add the appropriate EXPORT_SYMBOLS for proc_net_create, proc_net_fops_create and proc_net_remove to fix errors when compiling allmodconfig Signed-off-by:
Mark Nelson <markn@au1.ibm.com> Acked-by:
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Thomas Graf authored
This change allows the generic attribute interface to be used within the netfilter subsystem where this flag was initially introduced. The byte-order flag is yet unused, it's intended use is to allow automatic byte order convertions for all atomic types. Signed-off-by:
Thomas Graf <tgraf@suug.ch> Signed-off-by:
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David S. Miller authored
Requested by Johannes Berg. Signed-off-by: -
Eric Dumazet authored
When the periodic IP route cache flush is done (every 600 seconds on default configuration), some hosts suffer a lot and eventually trigger the "soft lockup" message. dst_run_gc() is doing a scan of a possibly huge list of dst_entries, eventually freeing some (less than 1%) of them, while holding the dst_lock spinlock for the whole scan. Then it rearms a timer to redo the full thing 1/10 s later... The slowdown can last one minute or so, depending on how active are the tcp sessions. This second version of the patch converts the processing from a softirq based one to a workqueue. Even if the list of entries in garbage_list is huge, host is still responsive to softirqs and can make progress. Instead of resetting gc timer to 0.1 second if one entry was freed in a gc run, we do this if more than 10% of entries were freed. Before patch : Aug 16 06:21:37 SRV1 kernel: BUG: soft lockup detected on CPU#0! Aug 16 06:21:37 SRV1 kernel: Aug 16 06:21:37 SRV1 kernel: Call Trace: Aug 16 06:21:37 SRV1 kernel: <IRQ> [<ffffffff802286f0>] wake_up_process+0x10/0x20 Aug 16 06:21:37 SRV1 kernel: [<ffffffff80251e09>] softlockup_tick+0xe9/0x110 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803cd380>] dst_run_gc+0x0/0x140 Aug 16 06:21:37 SRV1 kernel: [<ffffffff802376f3>] run_local_timers+0x13/0x20 Aug 16 06:21:37 SRV1 kernel: [<ffffffff802379c7>] update_process_times+0x57/0x90 Aug 16 06:21:37 SRV1 kernel: [<ffffffff80216034>] smp_local_timer_interrupt+0x34/0x60 Aug 16 06:21:37 SRV1 kernel: [<ffffffff802165cc>] smp_apic_timer_interrupt+0x5c/0x80 Aug 16 06:21:37 SRV1 kernel: [<ffffffff8020a816>] apic_timer_interrupt+0x66/0x70 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803cd3d3>] dst_run_gc+0x53/0x140 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803cd3c6>] dst_run_gc+0x46/0x140 Aug 16 06:21:37 SRV1 kernel: [<ffffffff80237148>] run_timer_softirq+0x148/0x1c0 Aug 16 06:21:37 SRV1 kernel: [<ffffffff8023340c>] __do_softirq+0x6c/0xe0 Aug 16 06:21:37 SRV1 kernel: [<ffffffff8020ad6c>] call_softirq+0x1c/0x30 Aug 16 06:21:37 SRV1 kernel: <EOI> [<ffffffff8020cb34>] do_softirq+0x34/0x90 Aug 16 06:21:37 SRV1 kernel: [<ffffffff802331cf>] local_bh_enable_ip+0x3f/0x60 Aug 16 06:21:37 SRV1 kernel: [<ffffffff80422913>] _spin_unlock_bh+0x13/0x20 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803dfde8>] rt_garbage_collect+0x1d8/0x320 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803cd4dd>] dst_alloc+0x1d/0xa0 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803e1433>] __ip_route_output_key+0x573/0x800 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803c02e2>] sock_common_recvmsg+0x32/0x50 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803e16dc>] ip_route_output_flow+0x1c/0x60 Aug 16 06:21:37 SRV1 kernel: [<ffffffff80400160>] tcp_v4_connect+0x150/0x610 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803ebf07>] inet_bind_bucket_create+0x17/0x60 Aug 16 06:21:37 SRV1 kernel: [<ffffffff8040cd16>] inet_stream_connect+0xa6/0x2c0 Aug 16 06:21:37 SRV1 kernel: [<ffffffff80422981>] _spin_lock_bh+0x11/0x30 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803c0bdf>] lock_sock_nested+0xcf/0xe0 Aug 16 06:21:37 SRV1 kernel: [<ffffffff80422981>] _spin_lock_bh+0x11/0x30 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803be551>] sys_connect+0x71/0xa0 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803eee3f>] tcp_setsockopt+0x1f/0x30 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803c030f>] sock_common_setsockopt+0xf/0x20 Aug 16 06:21:37 SRV1 kernel: [<ffffffff803be4bd>] sys_setsockopt+0x9d/0xc0 Aug 16 06:21:37 SRV1 kernel: [<ffffffff8028881e>] sys_ioctl+0x5e/0x80 Aug 16 06:21:37 SRV1 kernel: [<ffffffff80209c4e>] system_call+0x7e/0x83 After patch : (RT_CACHE_DEBUG set to 2 to get following traces) dst_total: 75469 delayed: 74109 work_perf: 141 expires: 150 elapsed: 8092 us dst_total: 78725 delayed: 73366 work_perf: 743 expires: 400 elapsed: 8542 us dst_total: 86126 delayed: 71844 work_perf: 1522 expires: 775 elapsed: 8849 us dst_total: 100173 delayed: 68791 work_perf: 3053 expires: 1256 elapsed: 9748 us dst_total: 121798 delayed: 64711 work_perf: 4080 expires: 1997 elapsed: 10146 us dst_total: 154522 delayed: 58316 work_perf: 6395 expires: 25 elapsed: 11402 us dst_total: 154957 delayed: 58252 work_perf: 64 expires: 150 elapsed: 6148 us dst_total: 157377 delayed: 57843 work_perf: 409 expires: 400 elapsed: 6350 us dst_total: 163745 delayed: 56679 work_perf: 1164 expires: 775 elapsed: 7051 us dst_total: 176577 delayed: 53965 work_perf: 2714 expires: 1389 elapsed: 8120 us dst_total: 198993 delayed: 49627 work_perf: 4338 expires: 1997 elapsed: 8909 us dst_total: 226638 delayed: 46865 work_perf: 2762 expires: 2748 elapsed: 7351 us I successfully reduced the IP route cache of many hosts by a four factor thanks to this patch. Previously, I had to disable "ip route flush cache" to avoid crashes. Signed-off-by:
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David S. Miller authored
My bad. Signed-off-by: -
David S. Miller authored
We will undo this once it is actually used. Signed-off-by: -
Eric W. Biederman authored
Until we support multiple network namespaces with netfilter only allow netfilter configuration in the initial network namespace. Signed-off-by:
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Eric W. Biederman authored
The simplest thing to implement is moving network devices between namespaces. However with the same attribute IFLA_NET_NS_PID we can easily implement creating devices in the destination network namespace as well. However that is a little bit trickier so this patch sticks to what is simple and easy. A pid is used to identify a process that happens to be a member of the network namespace we want to move the network device to. Signed-off-by:
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Eric W. Biederman authored
This patch introduces NETIF_F_NETNS_LOCAL a flag to indicate a network device is local to a single network namespace and should never be moved. Useful for pseudo devices that we need an instance in each network namespace (like the loopback device) and for any device we find that cannot handle multiple network namespaces so we may trap them in the initial network namespace. This patch introduces the function dev_change_net_namespace a function used to move a network device from one network namespace to another. To the network device nothing special appears to happen, to the components of the network stack it appears as if the network device was unregistered in the network namespace it is in, and a new device was registered in the network namespace the device was moved to. This patch sets up a namespace device destructor that upon the exit of a network namespace moves all of the movable network devices to the initial network namespace so they are not lost. Signed-off-by:
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Eric W. Biederman authored
When forcibly changing the network namespace of a device I need something that can generate a name for the device in the new namespace without overwriting the old name. __dev_alloc_name provides me that functionality. Signed-off-by:
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Eric W. Biederman authored
This patch makes most of the generic device layer network namespace safe. This patch makes dev_base_head a network namespace variable, and then it picks up a few associated variables. The functions: dev_getbyhwaddr dev_getfirsthwbytype dev_get_by_flags dev_get_by_name __dev_get_by_name dev_get_by_index __dev_get_by_index dev_ioctl dev_ethtool dev_load wireless_process_ioctl were modified to take a network namespace argument, and deal with it. vlan_ioctl_set and brioctl_set were modified so their hooks will receive a network namespace argument. So basically anthing in the core of the network stack that was affected to by the change of dev_base was modified to handle multiple network namespaces. The rest of the network stack was simply modified to explicitly use &init_net the initial network namespace. This can be fixed when those components of the network stack are modified to handle multiple network namespaces. For now the ifindex generator is left global. Fundametally ifindex numbers are per namespace, or else we will have corner case problems with migration when we get that far. At the same time there are assumptions in the network stack that the ifindex of a network device won't change. Making the ifindex number global seems a good compromise until the network stack can cope with ifindex changes when you change namespaces, and the like. Signed-off-by:
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Eric W. Biederman authored
Each netlink socket will live in exactly one network namespace, this includes the controlling kernel sockets. This patch updates all of the existing netlink protocols to only support the initial network namespace. Request by clients in other namespaces will get -ECONREFUSED. As they would if the kernel did not have the support for that netlink protocol compiled in. As each netlink protocol is updated to be multiple network namespace safe it can register multiple kernel sockets to acquire a presence in the rest of the network namespaces. The implementation in af_netlink is a simple filter implementation at hash table insertion and hash table look up time. Signed-off-by:
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Eric W. Biederman authored
Every user of the network device notifiers is either a protocol stack or a pseudo device. If a protocol stack that does not have support for multiple network namespaces receives an event for a device that is not in the initial network namespace it quite possibly can get confused and do the wrong thing. To avoid problems until all of the protocol stacks are converted this patch modifies all netdev event handlers to ignore events on devices that are not in the initial network namespace. As the rest of the code is made network namespace aware these checks can be removed. Signed-off-by:
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Eric W. Biederman authored
This patch modifies every packet receive function registered with dev_add_pack() to drop packets if they are not from the initial network namespace. This should ensure that the various network stacks do not receive packets in a anything but the initial network namespace until the code has been converted and is ready for them. Signed-off-by:
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Eric W. Biederman authored
Except for carefully selected pseudo devices all network interfaces should start out in the initial network namespace. Ultimately it will be register_netdev that examines what dev->nd_net is set to and places a device in a network namespace. This patch modifies alloc_netdev to initialize the network namespace a device is in with the initial network namespace. This gets it right for the vast majority of devices so their drivers need not be modified and for those few pseudo devices that need something different they can change this parameter before calling register_netdevice. The network namespace parameter on a network device is not reference counted as the devices are inside of a network namespace and cannot remain in that namespace past the lifetime of the network namespace. Signed-off-by:
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Eric W. Biederman authored
This patch passes in the namespace a new socket should be created in and has the socket code do the appropriate reference counting. By virtue of this all socket create methods are touched. In addition the socket create methods are modified so that they will fail if you attempt to create a socket in a non-default network namespace. Failing if we attempt to create a socket outside of the default network namespace ensures that as we incrementally make the network stack network namespace aware we will not export functionality that someone has not audited and made certain is network namespace safe. Allowing us to partially enable network namespaces before all of the exotic protocols are supported. Any protocol layers I have missed will fail to compile because I now pass an extra parameter into the socket creation code. [ Integrated AF_IUCV build fixes from Andrew Morton... -DaveM ] Signed-off-by:
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Eric W. Biederman authored
This patch makes /proc/net per network namespace. It modifies the global variables proc_net and proc_net_stat to be per network namespace. The proc_net file helpers are modified to take a network namespace argument, and all of their callers are fixed to pass &init_net for that argument. This ensures that all of the /proc/net files are only visible and usable in the initial network namespace until the code behind them has been updated to be handle multiple network namespaces. Making /proc/net per namespace is necessary as at least some files in /proc/net depend upon the set of network devices which is per network namespace, and even more files in /proc/net have contents that are relevant to a single network namespace. Signed-off-by:
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Eric W. Biederman authored
Sockets need to get a reference to their network namespace, or possibly a simple hold if someone registers on the network namespace notifier and will free the sockets when the namespace is going to be destroyed. Signed-off-by:
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Eric W. Biederman authored
Please note that network devices do not increase the count count on the network namespace. The are inside the network namespace and so the network namespace tag is in the nature of a back pointer and so getting and putting the network namespace is unnecessary. Signed-off-by:
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Eric W. Biederman authored
This is the network namespace from which all which all sockets and anything else under user control ultimately get their network namespace parameters. Signed-off-by:
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Eric W. Biederman authored
This is the basic infrastructure needed to support network namespaces. This infrastructure is: - Registration functions to support initializing per network namespace data when a network namespaces is created or destroyed. - struct net. The network namespace data structure. This structure will grow as variables are made per network namespace but this is the minimal starting point. - Functions to grab a reference to the network namespace. I provide both get/put functions that keep a network namespace from being freed. And hold/release functions serve as weak references and will warn if their count is not zero when the data structure is freed. Useful for dealing with more complicated data structures like the ipv4 route cache. - A list of all of the network namespaces so we can iterate over them. - A slab for the network namespace data structure allowing leaks to be spotted. Signed-off-by:
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Eric W. Biederman authored
The current implementation of dev_ifname makes maintenance difficult because updates to the implementation of the ioctl have to made in two places. So this patch updates dev_ifname32 to do a classic 32/64 structure conversion and call sys_ioctl like the rest of the compat calls do. Signed-off-by:
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Eric W. Biederman authored
This slightly improves code safety and clarity. Later network namespace patches touch this code so this is a preliminary cleanup. Signed-off-by:
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Joy Latten authored
This patch modifies the current ipsec audit layer by breaking it up into purpose driven audit calls. So far, the only audit calls made are when add/delete an SA/policy. It had been discussed to give each key manager it's own calls to do this, but I found there to be much redundnacy since they did the exact same things, except for how they got auid and sid, so I combined them. The below audit calls can be made by any key manager. Hopefully, this is ok. Signed-off-by:
Joy Latten <latten@austin.ibm.com> Signed-off-by:
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