1. 28 Apr, 2011 2 commits
    • Eric Dumazet's avatar
      inet: add RCU protection to inet->opt · f6d8bd05
      Eric Dumazet authored
      
      
      We lack proper synchronization to manipulate inet->opt ip_options
      
      Problem is ip_make_skb() calls ip_setup_cork() and
      ip_setup_cork() possibly makes a copy of ipc->opt (struct ip_options),
      without any protection against another thread manipulating inet->opt.
      
      Another thread can change inet->opt pointer and free old one under us.
      
      Use RCU to protect inet->opt (changed to inet->inet_opt).
      
      Instead of handling atomic refcounts, just copy ip_options when
      necessary, to avoid cache line dirtying.
      
      We cant insert an rcu_head in struct ip_options since its included in
      skb->cb[], so this patch is large because I had to introduce a new
      ip_options_rcu structure.
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Cc: Herbert Xu <herbert@gondor.apana.org.au>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f6d8bd05
    • Eric Dumazet's avatar
      net: filter: Just In Time compiler for x86-64 · 0a14842f
      Eric Dumazet authored
      
      
      In order to speedup packet filtering, here is an implementation of a
      JIT compiler for x86_64
      
      It is disabled by default, and must be enabled by the admin.
      
      echo 1 >/proc/sys/net/core/bpf_jit_enable
      
      It uses module_alloc() and module_free() to get memory in the 2GB text
      kernel range since we call helpers functions from the generated code.
      
      EAX : BPF A accumulator
      EBX : BPF X accumulator
      RDI : pointer to skb   (first argument given to JIT function)
      RBP : frame pointer (even if CONFIG_FRAME_POINTER=n)
      r9d : skb->len - skb->data_len (headlen)
      r8  : skb->data
      
      To get a trace of generated code, use :
      
      echo 2 >/proc/sys/net/core/bpf_jit_enable
      
      Example of generated code :
      
      # tcpdump -p -n -s 0 -i eth1 host 192.168.20.0/24
      
      flen=18 proglen=147 pass=3 image=ffffffffa00b5000
      JIT code: ffffffffa00b5000: 55 48 89 e5 48 83 ec 60 48 89 5d f8 44 8b 4f 60
      JIT code: ffffffffa00b5010: 44 2b 4f 64 4c 8b 87 b8 00 00 00 be 0c 00 00 00
      JIT code: ffffffffa00b5020: e8 24 7b f7 e0 3d 00 08 00 00 75 28 be 1a 00 00
      JIT code: ffffffffa00b5030: 00 e8 fe 7a f7 e0 24 00 3d 00 14 a8 c0 74 49 be
      JIT code: ffffffffa00b5040: 1e 00 00 00 e8 eb 7a f7 e0 24 00 3d 00 14 a8 c0
      JIT code: ffffffffa00b5050: 74 36 eb 3b 3d 06 08 00 00 74 07 3d 35 80 00 00
      JIT code: ffffffffa00b5060: 75 2d be 1c 00 00 00 e8 c8 7a f7 e0 24 00 3d 00
      JIT code: ffffffffa00b5070: 14 a8 c0 74 13 be 26 00 00 00 e8 b5 7a f7 e0 24
      JIT code: ffffffffa00b5080: 00 3d 00 14 a8 c0 75 07 b8 ff ff 00 00 eb 02 31
      JIT code: ffffffffa00b5090: c0 c9 c3
      
      BPF program is 144 bytes long, so native program is almost same size ;)
      
      (000) ldh      [12]
      (001) jeq      #0x800           jt 2    jf 8
      (002) ld       [26]
      (003) and      #0xffffff00
      (004) jeq      #0xc0a81400      jt 16   jf 5
      (005) ld       [30]
      (006) and      #0xffffff00
      (007) jeq      #0xc0a81400      jt 16   jf 17
      (008) jeq      #0x806           jt 10   jf 9
      (009) jeq      #0x8035          jt 10   jf 17
      (010) ld       [28]
      (011) and      #0xffffff00
      (012) jeq      #0xc0a81400      jt 16   jf 13
      (013) ld       [38]
      (014) and      #0xffffff00
      (015) jeq      #0xc0a81400      jt 16   jf 17
      (016) ret      #65535
      (017) ret      #0
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
      Cc: Ben Hutchings <bhutchings@solarflare.com>
      Cc: Hagen Paul Pfeifer <hagen@jauu.net>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0a14842f
  2. 27 Apr, 2011 21 commits
  3. 26 Apr, 2011 7 commits
  4. 25 Apr, 2011 8 commits
    • David S. Miller's avatar
      bluetooth: Fix use-before-initiailized var. · bf734843
      David S. Miller authored
      
      
      net/bluetooth/l2cap_core.c: In function ‘l2cap_recv_frame’:
      net/bluetooth/l2cap_core.c:3612:15: warning: ‘sk’ may be used uninitialized in this function
      net/bluetooth/l2cap_core.c:3612:15: note: ‘sk’ was declared here
      
      Actually the problem is in the inline function l2cap_data_channel(), we
      branch to the label 'done' which tests 'sk' before we set it to anything.
      
      Initialize it to NULL to fix this.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bf734843
    • David S. Miller's avatar
    • Somnath Kotur's avatar
      be2net: Fixed a bug in be_cmd_get_regs(). · fe2a70ee
      Somnath Kotur authored
      
      
      Same WRB entry was being reused over different iterations of a
      loop while issuing non-embedded IOCTL requests.Fixed couple of minor bugs
      in this path as well.
      Re-factored code to alloc/free memory for DMA outside of loop
      Signed-off-by: default avatarSomnath Kotur <somnath.kotur@emulex.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fe2a70ee
    • Jiri Pirko's avatar
      bonding: move processing of recv handlers into handle_frame() · 3aba891d
      Jiri Pirko authored
      
      
      Since now when bonding uses rx_handler, all traffic going into bond
      device goes thru bond_handle_frame. So there's no need to go back into
      bonding code later via ptype handlers. This patch converts
      original ptype handlers into "bonding receive probes". These functions
      are called from bond_handle_frame and they are registered per-mode.
      
      Note that vlan packets are also handled because they are always untagged
      thanks to vlan_untag()
      
      Note that this also allows arpmon for eth-bond-bridge-vlan topology.
      Signed-off-by: default avatarJiri Pirko <jpirko@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3aba891d
    • Michał Mirosław's avatar
    • Held Bernhard's avatar
      net: provide cow_metrics() methods to blackhole dst_ops · 0972ddb2
      Held Bernhard authored
      Since commit 62fa8a84 (net: Implement read-only protection and COW'ing
      of metrics.) the kernel throws an oops.
      
      [  101.620985] BUG: unable to handle kernel NULL pointer dereference at
                 (null)
      [  101.621050] IP: [<          (null)>]           (null)
      [  101.621084] PGD 6e53c067 PUD 3dd6a067 PMD 0
      [  101.621122] Oops: 0010 [#1] SMP
      [  101.621153] last sysfs file: /sys/devices/virtual/ppp/ppp/uevent
      [  101.621192] CPU 2
      [  101.621206] Modules linked in: l2tp_ppp pppox ppp_generic slhc
      l2tp_netlink l2tp_core deflate zlib_deflate twofish_x86_64
      twofish_common des_generic cbc ecb sha1_generic hmac af_key
      iptable_filter snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device loop
      snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec
      snd_pcm snd_timer snd i2c_i801 iTCO_wdt psmouse soundcore snd_page_alloc
      evdev uhci_hcd ehci_hcd thermal
      [  101.621552]
      [  101.621567] Pid: 5129, comm: openl2tpd Not tainted 2.6.39-rc4-Quad #3
      Gigabyte Technology Co., Ltd. G33-DS3R/G33-DS3R
      [  101.621637] RIP: 0010:[<0000000000000000>]  [<          (null)>]   (null)
      [  101.621684] RSP: 0018:ffff88003ddeba60  EFLAGS: 00010202
      [  101.621716] RAX: ffff88003ddb5600 RBX: ffff88003ddb5600 RCX:
      0000000000000020
      [  101.621758] RDX: ffffffff81a69a00 RSI: ffffffff81b7ee61 RDI:
      ffff88003ddb5600
      [  101.621800] RBP: ffff8800537cd900 R08: 0000000000000000 R09:
      ffff88003ddb5600
      [  101.621840] R10: 0000000000000005 R11: 0000000000014b38 R12:
      ffff88003ddb5600
      [  101.621881] R13: ffffffff81b7e480 R14: ffffffff81b7e8b8 R15:
      ffff88003ddebad8
      [  101.621924] FS:  00007f06e4182700(0000) GS:ffff88007fd00000(0000)
      knlGS:0000000000000000
      [  101.621971] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
      [  101.622005] CR2: 0000000000000000 CR3: 0000000045274000 CR4:
      00000000000006e0
      [  101.622046] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
      0000000000000000
      [  101.622087] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
      0000000000000400
      [  101.622129] Process openl2tpd (pid: 5129, threadinfo
      ffff88003ddea000, task ffff88003de9a280)
      [  101.622177] Stack:
      [  101.622191]  ffffffff81447efa ffff88007d3ded80 ffff88003de9a280
      ffff88007d3ded80
      [  101.622245]  0000000000000001 ffff88003ddebbb8 ffffffff8148d5a7
      0000000000000212
      [  101.622299]  ffff88003dcea000 ffff88003dcea188 ffffffff00000001
      ffffffff81b7e480
      [  101.622353] Call Trace:
      [  101.622374]  [<ffffffff81447efa>] ? ipv4_blackhole_route+0x1ba/0x210
      [  101.622415]  [<ffffffff8148d5a7>] ? xfrm_lookup+0x417/0x510
      [  101.622450]  [<ffffffff8127672a>] ? extract_buf+0x9a/0x140
      [  101.622485]  [<ffffffff8144c6a0>] ? __ip_flush_pending_frames+0x70/0x70
      [  101.622526]  [<ffffffff8146fbbf>] ? udp_sendmsg+0x62f/0x810
      [  101.622562]  [<ffffffff813f98a6>] ? sock_sendmsg+0x116/0x130
      [  101.622599]  [<ffffffff8109df58>] ? find_get_page+0x18/0x90
      [  101.622633]  [<ffffffff8109fd6a>] ? filemap_fault+0x12a/0x4b0
      [  101.622668]  [<ffffffff813fb5c4>] ? move_addr_to_kernel+0x64/0x90
      [  101.622706]  [<ffffffff81405d5a>] ? verify_iovec+0x7a/0xf0
      [  101.622739]  [<ffffffff813fc772>] ? sys_sendmsg+0x292/0x420
      [  101.622774]  [<ffffffff810b994a>] ? handle_pte_fault+0x8a/0x7c0
      [  101.622810]  [<ffffffff810b76fe>] ? __pte_alloc+0xae/0x130
      [  101.622844]  [<ffffffff810ba2f8>] ? handle_mm_fault+0x138/0x380
      [  101.622880]  [<ffffffff81024af9>] ? do_page_fault+0x189/0x410
      [  101.622915]  [<ffffffff813fbe03>] ? sys_getsockname+0xf3/0x110
      [  101.622952]  [<ffffffff81450c4d>] ? ip_setsockopt+0x4d/0xa0
      [  101.622986]  [<ffffffff813f9932>] ? sockfd_lookup_light+0x22/0x90
      [  101.623024]  [<ffffffff814b61fb>] ? system_call_fastpath+0x16/0x1b
      [  101.623060] Code:  Bad RIP value.
      [  101.623090] RIP  [<          (null)>]           (null)
      [  101.623125]  RSP <ffff88003ddeba60>
      [  101.623146] CR2: 0000000000000000
      [  101.650871] ---[ end trace ca3856a7d8e8dad4 ]---
      [  101.651011] __sk_free: optmem leakage (160 bytes) detected.
      
      The oops happens in dst_metrics_write_ptr()
      include/net/dst.h:124: return dst->ops->cow_metrics(dst, p);
      
      dst->ops->cow_metrics is NULL and causes the oops.
      
      Provide cow_metrics() methods, like we did in commit 214f45c9
      
      
      (net: provide default_advmss() methods to blackhole dst_ops)
      Signed-off-by: default avatarHeld Bernhard <berny156@gmx.de>
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0972ddb2
    • John W. Linville's avatar
      Merge branch 'master' of... · cfef6047
      John W. Linville authored
      Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem
      
      Conflicts:
      	drivers/net/wireless/iwlwifi/iwl-core.c
      	drivers/net/wireless/rt2x00/rt2x00queue.c
      	drivers/net/wireless/rt2x00/rt2x00queue.h
      cfef6047
    • Hans Petter Selasky's avatar
      cdc_ncm: fix short packet issue on some devices · 8c61d9d6
      Hans Petter Selasky authored
      
      
      The default maximum transmit length for NCM USB frames should be so
      that a short packet happens at the end if the device supports a length
      greater than the defined maximum. This is achieved by adding 4 bytes
      to the maximum length so that the existing logic can fit a short
      packet there.
      Signed-off-by: default avatarHans Petter Selasky <hselasky@c2i.net>
      Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8c61d9d6
  5. 24 Apr, 2011 2 commits