1. 19 Jan, 2011 1 commit
  2. 09 Jan, 2011 1 commit
  3. 05 Oct, 2010 1 commit
    • Johannes Berg's avatar
      genetlink: introduce pre_doit/post_doit hooks · ff4c92d8
      Johannes Berg authored
      
      
      Each family may have some amount of boilerplate
      locking code that applies to most, or even all,
      commands.
      
      This allows a family to handle such things in
      a more generic way, by allowing it to
       a) include private flags in each operation
       b) specify a pre_doit hook that is called,
          before an operation's doit() callback and
          may return an error directly,
       c) specify a post_doit hook that can undo
          locking or similar things done by pre_doit,
          and finally
       d) include two private pointers in each info
          struct passed between all these operations
          including doit(). (It's two because I'll
          need two in nl80211 -- can be extended.)
      Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
      Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
      Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
      ff4c92d8
  4. 26 Jul, 2010 2 commits
  5. 03 Apr, 2010 1 commit
  6. 30 Mar, 2010 1 commit
    • Tejun Heo's avatar
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking... · 5a0e3ad6
      Tejun Heo authored
      include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
      
      percpu.h is included by sched.h and module.h and thus ends up being
      included when building most .c files.  percpu.h includes slab.h which
      in turn includes gfp.h making everything defined by the two files
      universally available and complicating inclusion dependencies.
      
      percpu.h -> slab.h dependency is about to be removed.  Prepare for
      this change by updating users of gfp and slab facilities include those
      headers directly instead of assuming availability.  As this conversion
      needs to touch large number of source files, the following script is
      used as the basis of conversion.
      
        http://userweb.kernel.org/~tj/misc/slabh-sweep.py
      
      
      
      The script does the followings.
      
      * Scan files for gfp and slab usages and update includes such that
        only the necessary includes are there.  ie. if only gfp is used,
        gfp.h, if slab is used, slab.h.
      
      * When the script inserts a new include, it looks at the include
        blocks and try to put the new include such that its order conforms
        to its surrounding.  It's put in the include block which contains
        core kernel includes, in the same order that the rest are ordered -
        alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
        doesn't seem to be any matching order.
      
      * If the script can't find a place to put a new include (mostly
        because the file doesn't have fitting include block), it prints out
        an error message indicating which .h file needs to be added to the
        file.
      
      The conversion was done in the following steps.
      
      1. The initial automatic conversion of all .c files updated slightly
         over 4000 files, deleting around 700 includes and adding ~480 gfp.h
         and ~3000 slab.h inclusions.  The script emitted errors for ~400
         files.
      
      2. Each error was manually checked.  Some didn't need the inclusion,
         some needed manual addition while adding it to implementation .h or
         embedding .c file was more appropriate for others.  This step added
         inclusions to around 150 files.
      
      3. The script was run again and the output was compared to the edits
         from #2 to make sure no file was left behind.
      
      4. Several build tests were done and a couple of problems were fixed.
         e.g. lib/decompress_*.c used malloc/free() wrappers around slab
         APIs requiring slab.h to be added manually.
      
      5. The script was run on all .h files but without automatically
         editing them as sprinkling gfp.h and slab.h inclusions around .h
         files could easily lead to inclusion dependency hell.  Most gfp.h
         inclusion directives were ignored as stuff from gfp.h was usually
         wildly available and often used in preprocessor macros.  Each
         slab.h inclusion directive was examined and added manually as
         necessary.
      
      6. percpu.h was updated not to include slab.h.
      
      7. Build test were done on the following configurations and failures
         were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
         distributed build env didn't work with gcov compiles) and a few
         more options had to be turned off depending on archs to make things
         build (like ipr on powerpc/64 which failed due to missing writeq).
      
         * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
         * powerpc and powerpc64 SMP allmodconfig
         * sparc and sparc64 SMP allmodconfig
         * ia64 SMP allmodconfig
         * s390 SMP allmodconfig
         * alpha SMP allmodconfig
         * um on x86_64 SMP allmodconfig
      
      8. percpu.h modifications were reverted so that it could be applied as
         a separate patch and serve as bisection point.
      
      Given the fact that I had only a couple of failures from tests on step
      6, I'm fairly confident about the coverage of this conversion patch.
      If there is a breakage, it's likely to be something in one of the arch
      headers which should be easily discoverable easily on most builds of
      the specific arch.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Guess-its-ok-by: default avatarChristoph Lameter <cl@linux-foundation.org>
      Cc: Ingo Molnar <mingo@redhat.com>
      Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
      5a0e3ad6
  7. 13 Jan, 2010 1 commit
  8. 18 Oct, 2009 2 commits
  9. 24 Sep, 2009 1 commit
    • Johannes Berg's avatar
      genetlink: fix netns vs. netlink table locking (2) · b8273570
      Johannes Berg authored
      Similar to commit d136f1bd
      
      ,
      there's a bug when unregistering a generic netlink family,
      which is caught by the might_sleep() added in that commit:
      
          BUG: sleeping function called from invalid context at net/netlink/af_netlink.c:183
          in_atomic(): 1, irqs_disabled(): 0, pid: 1510, name: rmmod
          2 locks held by rmmod/1510:
           #0:  (genl_mutex){+.+.+.}, at: [<ffffffff8138283b>] genl_unregister_family+0x2b/0x130
           #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff8138270c>] __genl_unregister_mc_group+0x1c/0x120
          Pid: 1510, comm: rmmod Not tainted 2.6.31-wl #444
          Call Trace:
           [<ffffffff81044ff9>] __might_sleep+0x119/0x150
           [<ffffffff81380501>] netlink_table_grab+0x21/0x100
           [<ffffffff813813a3>] netlink_clear_multicast_users+0x23/0x60
           [<ffffffff81382761>] __genl_unregister_mc_group+0x71/0x120
           [<ffffffff81382866>] genl_unregister_family+0x56/0x130
           [<ffffffffa0007d85>] nl80211_exit+0x15/0x20 [cfg80211]
           [<ffffffffa000005a>] cfg80211_exit+0x1a/0x40 [cfg80211]
      
      Fix in the same way by grabbing the netlink table lock
      before doing rcu_read_lock().
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b8273570
  10. 14 Sep, 2009 1 commit
    • Johannes Berg's avatar
      genetlink: fix netns vs. netlink table locking · d136f1bd
      Johannes Berg authored
      
      
      Since my commits introducing netns awareness into
      genetlink we can get this problem:
      
      BUG: scheduling while atomic: modprobe/1178/0x00000002
      2 locks held by modprobe/1178:
       #0:  (genl_mutex){+.+.+.}, at: [<ffffffff8135ee1a>] genl_register_mc_grou
       #1:  (rcu_read_lock){.+.+..}, at: [<ffffffff8135eeb5>] genl_register_mc_g
      Pid: 1178, comm: modprobe Not tainted 2.6.31-rc8-wl-34789-g95cb731-dirty #
      Call Trace:
       [<ffffffff8103e285>] __schedule_bug+0x85/0x90
       [<ffffffff81403138>] schedule+0x108/0x588
       [<ffffffff8135b131>] netlink_table_grab+0xa1/0xf0
       [<ffffffff8135c3a7>] netlink_change_ngroups+0x47/0x100
       [<ffffffff8135ef0f>] genl_register_mc_group+0x12f/0x290
      
      because I overlooked that netlink_table_grab() will
      schedule, thinking it was just the rwlock. However,
      in the contention case, that isn't actually true.
      
      Fix this by letting the code grab the netlink table
      lock first and then the RCU for netns protection.
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d136f1bd
  11. 04 Sep, 2009 1 commit
  12. 12 Jul, 2009 1 commit
    • Johannes Berg's avatar
      genetlink: make netns aware · 134e6375
      Johannes Berg authored
      
      
      This makes generic netlink network namespace aware. No
      generic netlink families except for the controller family
      are made namespace aware, they need to be checked one by
      one and then set the family->netnsok member to true.
      
      A new function genlmsg_multicast_netns() is introduced to
      allow sending a multicast message in a given namespace,
      for example when it applies to an object that lives in
      that namespace, a new function genlmsg_multicast_allns()
      to send a message to all network namespaces (for objects
      that do not have an associated netns).
      
      The function genlmsg_multicast() is changed to multicast
      the message in just init_net, which is currently correct
      for all generic netlink families since they only work in
      init_net right now. Some will later want to work in all
      net namespaces because they do not care about the netns
      at all -- those will have to be converted to use one of
      the new functions genlmsg_multicast_allns() or
      genlmsg_multicast_netns() whenever they are made netns
      aware in some way.
      
      After this patch families can easily decide whether or
      not they should be available in all net namespaces. Many
      genl families us it for objects not related to networking
      and should therefore be available in all namespaces, but
      that will have to be done on a per family basis.
      
      Note that this doesn't touch on the checkpoint/restart
      problem where network namespaces could be used, genl
      families and multicast groups are numbered globally and
      I see no easy way of changing that, especially since it
      must be possible to multicast to all network namespaces
      for those families that do not care about netns.
      Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      134e6375
  13. 21 May, 2009 1 commit
  14. 07 Jan, 2009 1 commit
  15. 18 Jun, 2008 1 commit
    • Patrick McHardy's avatar
      netlink: genl: fix circular locking · 6d1a3fb5
      Patrick McHardy authored
      
      
      genetlink has a circular locking dependency when dumping the registered
      families:
      
      - dump start:
      genl_rcv()            : take genl_mutex
      genl_rcv_msg()        : call netlink_dump_start() while holding genl_mutex
      netlink_dump_start(),
      netlink_dump()        : take nlk->cb_mutex
      ctrl_dumpfamily()     : try to detect this case and not take genl_mutex a
                              second time
      
      - dump continuance:
      netlink_rcv()         : call netlink_dump
      netlink_dump          : take nlk->cb_mutex
      ctrl_dumpfamily()     : take genl_mutex
      
      Register genl_lock as callback mutex with netlink to fix this. This slightly
      widens an already existing module unload race, the genl ops used during the
      dump might go away when the module is unloaded. Thomas Graf is working on a
      seperate fix for this.
      Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6d1a3fb5
  16. 03 Jun, 2008 1 commit
  17. 12 Feb, 2008 1 commit
  18. 10 Oct, 2007 4 commits
    • Denis V. Lunev's avatar
      [NET]: make netlink user -> kernel interface synchronious · cd40b7d3
      Denis V. Lunev authored
      
      
      This patch make processing netlink user -> kernel messages synchronious.
      This change was inspired by the talk with Alexey Kuznetsov about current
      netlink messages processing. He says that he was badly wrong when introduced 
      asynchronious user -> kernel communication.
      
      The call netlink_unicast is the only path to send message to the kernel
      netlink socket. But, unfortunately, it is also used to send data to the
      user.
      
      Before this change the user message has been attached to the socket queue
      and sk->sk_data_ready was called. The process has been blocked until all
      pending messages were processed. The bad thing is that this processing
      may occur in the arbitrary process context.
      
      This patch changes nlk->data_ready callback to get 1 skb and force packet
      processing right in the netlink_unicast.
      
      Kernel -> user path in netlink_unicast remains untouched.
      
      EINTR processing for in netlink_run_queue was changed. It forces rtnl_lock
      drop, but the process remains in the cycle until the message will be fully
      processed. So, there is no need to use this kludges now.
      Signed-off-by: default avatarDenis V. Lunev <den@openvz.org>
      Acked-by: default avatarAlexey Kuznetsov <kuznet@ms2.inr.ac.ru>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cd40b7d3
    • Denis V. Lunev's avatar
      [NET]: Make netlink processing routines semi-synchronious (inspired by rtnl) v2 · 3b71535f
      Denis V. Lunev authored
      
      
      The code in netfilter/nfnetlink.c and in ./net/netlink/genetlink.c looks
      like outdated copy/paste from rtnetlink.c. Push them into sync with the
      original.
      
      Changes from v1:
      - deleted comment in nfnetlink_rcv_msg by request of Patrick McHardy
      Signed-off-by: default avatarDenis V. Lunev <den@openvz.org>
      Acked-by: default avatarPatrick McHardy <kaber@trash.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3b71535f
    • Herbert Xu's avatar
      [NETLINK]: Avoid pointer in netlink_run_queue · 0cfad075
      Herbert Xu authored
      
      
      I was looking at Patrick's fix to inet_diag and it occured
      to me that we're using a pointer argument to return values
      unnecessarily in netlink_run_queue.  Changing it to return
      the value will allow the compiler to generate better code
      since the value won't have to be memory-backed.
      Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0cfad075
    • Eric W. Biederman's avatar
      [NET]: Support multiple network namespaces with netlink · b4b51029
      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: default avatarEric W. Biederman <ebiederm@xmission.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b4b51029
  19. 24 Jul, 2007 3 commits
  20. 18 Jul, 2007 1 commit
  21. 07 Jun, 2007 1 commit
  22. 25 Apr, 2007 5 commits
  23. 11 Feb, 2007 1 commit
  24. 06 Dec, 2006 2 commits
  25. 02 Dec, 2006 4 commits