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path: root/net/mac80211/sta_info.c
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2008-04-08mac80211: rename filesJohannes Berg
This patch renames all mac80211 files (except ieee80211_i.h) to get rid of the useless ieee80211_ prefix. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-08mac80211: fix key vs. sta locking problemsJohannes Berg
Up to now, key manipulation is supposed to run under RTNL to avoid concurrent manipulations and also allow the set_key() hardware callback to sleep. This is not feasible because STA structs are rcu-protected and thus a lot of operations there cannot take the RTNL. Also, key references are rcu-protected so we cannot do things atomically. This patch changes key locking completely: * key operations are now atomic * hardware crypto offload is enabled and disabled from a workqueue, due to that key freeing is also delayed * debugfs code is also run from a workqueue * keys reference STAs (and vice versa!) so during STA unlink the STAs key reference is removed but not the keys STA reference, to avoid races key todo work is run before STA destruction. * fewer STA operations now need the RTNL which was required due to key operations This fixes the locking problems lockdep pointed out and also makes things more light-weight because the rtnl isn't required as much. Note that the key todo lock/key mutex are global locks, this is not required, of course, they could be per-hardware instead. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-08mac80211: fix sta-info pinningJohannes Berg
When a STA is supposed to be unlinked but is pinned, it still needs to be unlinked from all structures. Only at the end of the unlink process should we check for pin status and invalidate the callers reference if it is pinned. Move the pin status check down. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-08mac80211: fix defined but not usedJiri Slaby
These two symbols are used only in ifdeffed function. Move them to that section too. net/mac80211/sta_info.c:387: warning: `__sta_info_pin' defined but not used net/mac80211/sta_info.c:397: warning: `__sta_info_unpin' defined but not used Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Cc: Michael Wu <flamingice@sourmilk.net> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-08mac80211: fix possible sta-debugfs work lockupJohannes Berg
Because we queue the sta-debugfs-adding work on our mac80211 workqueue (which needs to be flushed under RTNL) and that work needs the RTNL, it can currently deadlock, thanks to Reinette Chatre for pointing out the lockdep warning about this. This patch fixes it by moving this work to the common kernel workqueue (using schedule_work) and canceling it as appropriate. It also fixes a related problem: When a STA is pinned by the debugfs adding work and sta_info_flush() runs concurrently it is not guaranteed that all STAs are removed from the driver before the corresponding interface is removed which may lead to bugs. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Cc: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-01mac80211: fix spinlock recursion on sta expirationLuis Carlos Cobo
Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-01mac80211: sta_info_flush() fixesJohannes Berg
When the IBSS code tries to flush the STA list, it does so in an atomic context. Flushing isn't safe there, however, and requires the RTNL, so we need to defer it to a workqueue. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-01mac80211: clean up sta_info_destroy() users wrt. RCU/lockingJohannes Berg
Calling sta_info_destroy() doesn't require RCU-synchronisation before-hand because it does that internally. However, it does require rtnl-locking so insert that where necessary. Also clean up the code doing it internally to be a bit clearer and not synchronize twice if keys are configured. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-01mac80211: automatically free sta struct when insertion failsJohannes Berg
When STA structure insertion fails, it has been allocated but isn't really alive yet, it isn't reachable by any other code and also can't yet have much configured. This patch changes the code so that when the insertion fails, the resulting STA pointer is no longer valid because it is freed. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-04-01mac80211: fix sta_info_destroy(NULL)Johannes Berg
sta_info_destroy(NULL) should be valid, but currently isn't because the argument is dereferenced before the NULL check. There are no users that currently pass in NULL, i.e. all check before calling the function, but I want to change that. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-27mac80211: A-MPDU MLME use dynamic allocationRon Rindjunsky
This patch alters the A-MPDU MLME in sta_info to use dynamic allocation, thus drastically improving memory usage - from a constant ~2 Kbyte in the previous (static) allocation to a lower limit of ~200 Byte and an upper limit of ~2 Kbyte. Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: fix mesh_path and sta_info get_by_idx functionsLuis Carlos Cobo
Skip properly entries whose dev does not match. Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: add PLINK_ prefix and kernel doc to enum plink_stateLuis Carlos Cobo
Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: fix sta_info mesh timer bugJohannes Berg
I noticed a bug I introduced when mesh is enabled: sta_info_destroy() will end up calling cancel_timer() on a timer that has never been initialized because the timer is only initialized in mesh_plink_alloc(), not in sta_info_alloc(). This patch moves the initialization of all mesh related fields into sta_info_alloc(), adds a bit of sanity checking to the cfg80211 handlers and sta_info_insert() and makes mesh_plink_alloc() a static helper function that is only used from the mesh plink code. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Cc: Luis Carlos Cobo <luisca@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: add documentation bookJohannes Berg
Quite a while ago I started this book. The required kernel-doc patches have since gone into the tree so it is now possible to build the book in mainline. The actual documentation is still rather incomplete and not all things are linked into the book, but this enables us to edit the documentation collaboratively, hopefully driver authors can add documentation based on their experience with mac80211. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: remove STA entries when taking down interfaceJohannes Berg
When we take down an interface, we need to remove the STA info items that belong to it because otherwise we might invoke a sta_notify() callback in the driver when we later delete the STA entries, but in that case the driver will already have removed its knowledge of the interface they belonged to leading to confusion. Also, we could invoke the set_tim() callback after the driver removed its knowledge of the interface, which can lead to a crash if it requests a beacon with a then-invalid vif pointer! A side effect of this patch is that, because it was easier, it disallows changing the WDS peer while an interface is up. Should that actually be necessary, it can be added back, but the WDS peer STA entry may not be added while the interface is UP so for now I've simplified the WDS peer's STA entry lifetime management. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: split sta_info_addJohannes Berg
sta_info_add() has two functions: allocating a station info structure and inserting it into the hash table/list. Splitting these two functions allows allocating with GFP_KERNEL in many places instead of GFP_ATOMIC which is now required by the RCU protection. Additionally, in many places RCU protection is now no longer needed at all because between sta_info_alloc() and sta_info_insert() the caller owns the structure. This fixes a few race conditions with setting initial flags and similar, but not all (see comments in ieee80211_sta.c and cfg.c). More documentation on the existing races will be in a follow-up patch. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: RCU-ify STA info structure accessJohannes Berg
This makes access to the STA hash table/list use RCU to protect against freeing of items. However, it's not a true RCU, the copy step is missing: whenever somebody changes a STA item it is simply updated. This is an existing race condition that is now somewhat understandable. This patch also fixes the race key freeing vs. STA destruction by making sure that sta_info_destroy() is always called under RTNL and frees the key. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: clean up mesh codeJohannes Berg
Various cleanups, reducing the #ifdef mess and other things. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-03-06mac80211: mesh data structures and first mesh changesLuis Carlos Cobo
Includes integration in struct sta_info of mesh peer link elements, previously on their own mesh peer link table. Signed-off-by: Luis Carlos Cobo <luisca@cozybit.com> Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-02-29mac80211: split ieee80211_key_alloc/freeJohannes Berg
In order to RCU-ify sta_info, we need to be able to allocate a key without linking it to an sdata/sta structure (because allocation cannot be done in an rcu critical section). This patch splits up ieee80211_key_alloc() and updates all users appropriately. While at it, this patch fixes a number of race conditions such as finally making key replacement atomic, unfortunately at the expense of more complex code. Note that this patch documents /existing/ bugs with sta info and key interaction, there is currently a race condition when a sta info is freed without holding the RTNL. This will finally be fixed by a followup patch. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-02-29mac80211: atomically check whether STA exists alreadyJohannes Berg
When a STA structure is added, it is often checked whether it already exists before adding it. This, however, isn't done atomically so there is a race condition that could lead to two STA structures being added with the same MAC address. This patch changes sta_info_add() to return an ERR_PTR in case of failure and adds the failure mode -EEXIST when the STA already exists. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Cc: Luis Carlos Cobo <luisca@cozybit.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-02-29mac80211: consolidate TIM handling codeJohannes Berg
This consolidates all TIM handling code to avoid re-introducing errors with the bitmap/set_tim order and to reduce code. While reading the code I noticed a possible problem so I also added a comment about that. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-02-29mac80211: remove sta TIM flag, fix expiry TIM handlingJohannes Berg
The TIM flag that is kept in each station's info is completely useless, there's no code (aside from the debugfs display code) checking it, hence it can be removed. While doing that, I noticed that the TIM handling is broken when buffered frames expire, so fix that. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-02-29mac80211: invoke set_tim() callback after setting own TIM infoJohannes Berg
Drivers should be allowed to simply get a complete new beacon when set_tim() is invoked (and set_tim() is required for drivers that just want a beacon template!), so we need to update our own TIM bitmap before calling set_tim() so that getting the beacon will now get an already updated beacon. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-02-29cfg80211 API for channels/bitrates, mac80211 and driver conversionJohannes Berg
This patch creates new cfg80211 wiphy API for channel and bitrate registration and converts mac80211 and drivers to the new API. The old mac80211 API is completely ripped out. All drivers (except ath5k) are updated to the new API, in many cases I expect that optimisations can be done. Along with the regulatory code I've also ripped out the IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED flag, I believe it to be unnecessary if the hardware simply gives us whatever channels it wants to support and we then enable/disable them as required, which is pretty much required for travelling. Additionally, the patch adds proper "basic" rate handling for STA mode interface, AP mode interface will have to have new API added to allow userspace to set the basic rate set, currently it'll be empty... However, the basic rate handling will need to be moved to the BSS conf stuff. I do expect there to be bugs in this, especially wrt. transmit power handling where I'm basically clueless about how it should work. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-02-29mac80211: A-MPDU Tx MLME data initializationRon Rindjunsky
This patch initialize A-MPDU MLME data for Tx sessions. Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-01-28mac80211: move interface type to vif structureJohannes Berg
Drivers that support mixed AP/STA operation may well need to know the type of a virtual interface when iterating over them. The easiest way to support that is to move the interface type variable into the vif structure. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-01-28mac80211: dont use interface indices in driversJohannes Berg
This patch gets rid of the if_id stuff where possible in favour of a new per-virtual-interface structure "struct ieee80211_vif". This structure is located at the end of the per-interface structure and contains a variable length driver-use data area. This has two advantages: * removes the need to look up interfaces by if_id, this is better for working with network namespaces and performance * allows drivers to store and retrieve per-interface data without having to allocate own lists/hash tables Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2008-01-28mac80211: A-MPDU Rx MLME data initializationRon Rindjunsky
This patch initialize A-MPDU MLME data for Rx sessions. Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28mac80211: A-MPDU Rx adding basic functionalityRon Rindjunsky
This patch adds the basic needed abilities and functions for A-MPDU Rx session changed functions: - ieee80211_sta_process_addba_request - Rx A-MPDU initialization enabled - ieee80211_stop - stops all A-MPDU Rx in case interface goes down added functions: - ieee80211_send_delba - used for sending out Del BA in A-MPDU sessions - ieee80211_sta_stop_rx_BA_session - stopping Rx A-MPDU session - sta_rx_agg_session_timer_expired - stops A-MPDU Rx use if load is too low Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28[NET]: Convert init_timer into setup_timerPavel Emelyanov
Many-many code in the kernel initialized the timer->function and timer->data together with calling init_timer(timer). There is already a helper for this. Use it for networking code. The patch is HUGE, but makes the code 130 lines shorter (98 insertions(+), 228 deletions(-)). Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-12-26mac80211: round station cleanup timerJohannes Berg
The station cleanup timer runs every ten seconds, the exact timing is not relevant at all so it can well run together with other things to save power. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2007-10-10[MAC80211]: add sta_notify callbackTomas Winkler
This patch adds sta_notify callback and removes sta_table_notification which was not used by any driver. sta_notify() is essential for drivers that keeps notion of station internally and need to be notified about removal or addition of a station to the (I)BSS or assocation to an AP. This version adds interface id to the parameter list as suggested by Johannes Berg Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Acked-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10[MAC80211]: print out wiphy name instead of master deviceJohannes Berg
This makes mac80211 print out the wiphy name instead of the master device name where appropriate. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Michael Wu <flamingice@sourmilk.net> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10[NET]: Introduce and use print_mac() and DECLARE_MAC_BUF()Joe Perches
This is nicer than the MAC_FMT stuff. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10[MAC80211]: rework key handlingJohannes Berg
This moves all the key handling code out from ieee80211_ioctl.c into key.c and also does the following changes including documentation updates in mac80211.h: 1) Turn off hardware acceleration for keys when the interface is down. This is necessary because otherwise monitor interfaces could be decrypting frames for other interfaces that are down at the moment. Also, it should go some way towards better suspend/resume support, in any case the routines used here could be used for that as well. Additionally, this makes the driver interface nicer, keys for a specific local MAC address are only ever present while an interface with that MAC address is enabled. 2) Change driver set_key() callback interface to allow only return values of -ENOSPC, -EOPNOTSUPP and 0, warn on all other return values. This allows debugging the stack when a driver notices it's handed a key while it is down. 3) Invert the flag meaning to KEY_FLAG_UPLOADED_TO_HARDWARE. 4) Remove REMOVE_ALL_KEYS command as it isn't used nor do we want to use it, we'll use DISABLE_KEY for each key. It is hard to use REMOVE_ALL_KEYS because we can handle multiple virtual interfaces with different key configuration, so we'd have to keep track of a lot of state for this and that isn't worth it. 5) Warn when disabling a key fails, it musn't. 6) Remove IEEE80211_HW_NO_TKIP_WMM_HWACCEL in favour of per-key IEEE80211_KEY_FLAG_WMM_STA to let driver sort it out itself. 7) Tell driver that a (non-WEP) key is used only for transmission by using an all-zeroes station MAC address when configuring. 8) Change the set_key() callback to have access to the local MAC address the key is being added for. 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>
2007-10-10[MAC80211]: remove fake set_key() callJohannes Berg
Remove adding a fake key with a NONE key algorithm for each associated STA. If we have hardware with such TX filtering we should probably extend the sta_table_notification() callback with the sta information instead; the fact that it's treated as a key for some atheros hardware shouldn't bother the stack. 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>
2007-10-10[MAC80211] key handling: remove default_wep_onlyJohannes Berg
Remove the default_wep_only stuff, this wasn't really done well and no current driver actually cares. 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>
2007-10-10[MAC80211]: embed key conf in key, fix driver interfaceJohannes Berg
This patch embeds the struct ieee80211_key_conf into struct ieee80211_key and thus avoids allocations and having data present twice. This required some more changes: 1) The removal of the IEEE80211_KEY_DEFAULT_TX_KEY key flag. This flag isn't used by drivers nor should it be since we have a set_key_idx() callback. Maybe that callback needs to be extended to include the key conf, but only a driver that requires it will tell. 2) The removal of the IEEE80211_KEY_DEFAULT_WEP_ONLY key flag. This flag is global, so it shouldn't be passed in the key conf structure. Pass it to the function instead. Also, this patch removes the AID parameter to the set_key() callback because it is currently unused and the hardware currently cannot know about the AID anyway. I suspect this was used with some hardware that actually selected the AID itself, but that functionality was removed. Additionally, I've removed the ALG_NULL key algorithm since we have ALG_NONE. 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>
2007-10-10[MAC80211]: improve locking of sta_info related structuresMichael Wu
The sta_info code has some awkward locking which prevents some driver callbacks from being allowed to sleep. This patch makes the locking more focused so code that calls driver callbacks are allowed to sleep. It also converts sta_lock to a rwlock. Signed-off-by: Michael Wu <flamingice@sourmilk.net> Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2007-05-05[MAC80211]: Add debugfs attributes.Jiri Benc
Export various mac80211 internal variables through debugfs. Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-05-05[MAC80211]: Add mac80211 wireless stack.Jiri Benc
Add mac80211, the IEEE 802.11 software MAC layer. Signed-off-by: Jiri Benc <jbenc@suse.cz> Signed-off-by: John W. Linville <linville@tuxdriver.com>