1. 01 Mar, 2011 1 commit
  2. 30 Jan, 2011 1 commit
    • Eric W. Biederman's avatar
      net: Add compat ioctl support for the ipv4 multicast ioctl SIOCGETSGCNT · 709b46e8
      Eric W. Biederman authored
      
      
      SIOCGETSGCNT is not a unique ioctl value as it it maps tio SIOCPROTOPRIVATE +1,
      which unfortunately means the existing infrastructure for compat networking
      ioctls is insufficient.  A trivial compact ioctl implementation would conflict
      with:
      
      SIOCAX25ADDUID
      SIOCAIPXPRISLT
      SIOCGETSGCNT_IN6
      SIOCGETSGCNT
      SIOCRSSCAUSE
      SIOCX25SSUBSCRIP
      SIOCX25SDTEFACILITIES
      
      To make this work I have updated the compat_ioctl decode path to mirror the
      the normal ioctl decode path.  I have added an ipv4 inet_compat_ioctl function
      so that I can have ipv4 specific compat ioctls.   I have added a compat_ioctl
      function into struct proto so I can break out ioctls by which kind of ip socket
      I am using.  I have added a compat_raw_ioctl function because SIOCGETSGCNT only
      works on raw sockets.  I have added a ipmr_compat_ioctl that mirrors the normal
      ipmr_ioctl.
      
      This was necessary because unfortunately the struct layout for the SIOCGETSGCNT
      has unsigned longs in it so changes between 32bit and 64bit kernels.
      
      This change was sufficient to run a 32bit ip multicast routing daemon on a
      64bit kernel.
      Reported-by: default avatarBill Fenner <fenner@aristanetworks.com>
      Signed-off-by: default avatarEric W. Biederman <ebiederm@xmission.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      709b46e8
  3. 17 Nov, 2010 1 commit
  4. 19 Aug, 2010 1 commit
  5. 11 Jun, 2010 1 commit
  6. 07 Jun, 2010 1 commit
  7. 28 Apr, 2010 1 commit
  8. 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
  9. 25 Mar, 2010 1 commit
  10. 29 Oct, 2009 1 commit
    • Neil Horman's avatar
      AF_RAW: Augment raw_send_hdrinc to expand skb to fit iphdr->ihl (v2) · 55888dfb
      Neil Horman authored
      
      
      Augment raw_send_hdrinc to correct for incorrect ip header length values
      
      A series of oopses was reported to me recently.  Apparently when using AF_RAW
      sockets to send data to peers that were reachable via ipsec encapsulation,
      people could panic or BUG halt their systems.
      
      I've tracked the problem down to user space sending an invalid ip header over an
      AF_RAW socket with IP_HDRINCL set to 1.
      
      Basically what happens is that userspace sends down an ip frame that includes
      only the header (no data), but sets the ip header ihl value to a large number,
      one that is larger than the total amount of data passed to the sendmsg call.  In
      raw_send_hdrincl, we allocate an skb based on the size of the data in the msghdr
      that was passed in, but assume the data is all valid.  Later during ipsec
      encapsulation, xfrm4_tranport_output moves the entire frame back in the skbuff
      to provide headroom for the ipsec headers.  During this operation, the
      skb->transport_header is repointed to a spot computed by
      skb->network_header + the ip header length (ihl).  Since so little data was
      passed in relative to the value of ihl provided by the raw socket, we point
      transport header to an unknown location, resulting in various crashes.
      
      This fix for this is pretty straightforward, simply validate the value of of
      iph->ihl when sending over a raw socket.  If (iph->ihl*4U) > user data buffer
      size, drop the frame and return -EINVAL.  I just confirmed this fixes the
      reported crashes.
      Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      55888dfb
  11. 19 Oct, 2009 1 commit
    • Eric Dumazet's avatar
      inet: rename some inet_sock fields · c720c7e8
      Eric Dumazet authored
      
      
      In order to have better cache layouts of struct sock (separate zones
      for rx/tx paths), we need this preliminary patch.
      
      Goal is to transfert fields used at lookup time in the first
      read-mostly cache line (inside struct sock_common) and move sk_refcnt
      to a separate cache line (only written by rx path)
      
      This patch adds inet_ prefix to daddr, rcv_saddr, dport, num, saddr,
      sport and id fields. This allows a future patch to define these
      fields as macros, like sk_refcnt, without name clashes.
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c720c7e8
  12. 15 Oct, 2009 1 commit
  13. 12 Oct, 2009 1 commit
    • Neil Horman's avatar
      net: Generalize socket rx gap / receive queue overflow cmsg · 3b885787
      Neil Horman authored
      Create a new socket level option to report number of queue overflows
      
      Recently I augmented the AF_PACKET protocol to report the number of frames lost
      on the socket receive queue between any two enqueued frames.  This value was
      exported via a SOL_PACKET level cmsg.  AFter I completed that work it was
      requested that this feature be generalized so that any datagram oriented socket
      could make use of this option.  As such I've created this patch, It creates a
      new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a
      SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue
      overflowed between any two given frames.  It also augments the AF_PACKET
      protocol to take advantage of this new feature (as it previously did not touch
      sk->sk_drops, which this patch uses to record the overflow count).  Tested
      successfully by me.
      
      Notes:
      
      1) Unlike my previous patch, this patch simply records the sk_drops value, which
      is not a number of drops between packets, but rather a total number of drops.
      Deltas must be computed in user space.
      
      2) While this patch currently works with datagram oriented protocols, it will
      also be accepted by non-datagram oriented protocols. I'm not sure if thats
      agreeable to everyone, but my argument in favor of doing so is that, for those
      protocols which aren't applicable to this option, sk_drops will always be zero,
      and reporting no drops on a receive queue that isn't used for those
      non-participating protocols seems reasonable to me.  This also saves us having
      to code in a per-protocol opt in mechanism.
      
      3) This applies cleanly to net-next assuming that commit
      97775007
      
       (my af packet cmsg patch) is reverted
      Signed-off-by: default avatarNeil Horman <nhorman@tuxdriver.com>
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3b885787
  14. 30 Sep, 2009 1 commit
  15. 03 Sep, 2009 1 commit
    • Eric Dumazet's avatar
      ip: Report qdisc packet drops · 6ce9e7b5
      Eric Dumazet authored
      
      
      Christoph Lameter pointed out that packet drops at qdisc level where not
      accounted in SNMP counters. Only if application sets IP_RECVERR, drops
      are reported to user (-ENOBUFS errors) and SNMP counters updated.
      
      IP_RECVERR is used to enable extended reliable error message passing,
      but these are not needed to update system wide SNMP stats.
      
      This patch changes things a bit to allow SNMP counters to be updated,
      regardless of IP_RECVERR being set or not on the socket.
      
      Example after an UDP tx flood
      # netstat -s 
      ...
      IP:
          1487048 outgoing packets dropped
      ...
      Udp:
      ...
          SndbufErrors: 1487048
      
      
      send() syscalls, do however still return an OK status, to not
      break applications.
      
      Note : send() manual page explicitly says for -ENOBUFS error :
      
       "The output queue for a network interface was full.
        This generally indicates that the interface has stopped sending,
        but may be caused by transient congestion.
        (Normally, this does not occur in Linux. Packets are just silently
        dropped when a device queue overflows.) "
      
      This is not true for IP_RECVERR enabled sockets : a send() syscall
      that hit a qdisc drop returns an ENOBUFS error.
      
      Many thanks to Christoph, David, and last but not least, Alexey !
      Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6ce9e7b5
  16. 18 Jun, 2009 1 commit
  17. 03 Jun, 2009 1 commit
  18. 16 Feb, 2009 1 commit
  19. 24 Nov, 2008 1 commit
    • Eric Dumazet's avatar
      net: avoid a pair of dst_hold()/dst_release() in ip_append_data() · 2e77d89b
      Eric Dumazet authored
      
      
      We can reduce pressure on dst entry refcount that slowdown UDP transmit
      path on SMP machines. This pressure is visible on RTP servers when
      delivering content to mediagateways, especially big ones, handling
      thousand of streams. Several cpus send UDP frames to the same
      destination, hence use the same dst entry.
      
      This patch makes ip_append_data() eventually steal the refcount its
      callers had to take on the dst entry.
      
      This doesnt avoid all refcounting, but still gives speedups on SMP,
      on UDP/RAW transmit path
      Signed-off-by: default avatarEric Dumazet <dada1@cosmosbay.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      2e77d89b
  20. 03 Nov, 2008 1 commit
  21. 17 Jul, 2008 1 commit
  22. 15 Jul, 2008 1 commit
  23. 18 Jun, 2008 1 commit
    • Eric Dumazet's avatar
      udp: sk_drops handling · cb61cb9b
      Eric Dumazet authored
      In commits 33c732c3 ([IPV4]: Add raw
      drops counter) and a92aa318
      
       ([IPV6]:
      Add raw drops counter), Wang Chen added raw drops counter for
      /proc/net/raw & /proc/net/raw6
      
      This patch adds this capability to UDP sockets too (/proc/net/udp &
      /proc/net/udp6).
      
      This means that 'RcvbufErrors' errors found in /proc/net/snmp can be also
      be examined for each udp socket.
      
      # grep Udp: /proc/net/snmp
      Udp: InDatagrams NoPorts InErrors OutDatagrams RcvbufErrors SndbufErrors
      Udp: 23971006 75 899420 16390693 146348 0
      
      # cat /proc/net/udp
       sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt  ---
      uid  timeout inode ref pointer drops
       75: 00000000:02CB 00000000:0000 07 00000000:00000000 00:00000000 00000000  ---
        0        0 2358 2 ffff81082a538c80 0
      111: 00000000:006F 00000000:0000 07 00000000:00000000 00:00000000 00000000  ---
        0        0 2286 2 ffff81042dd35c80 146348
      
      In this example, only port 111 (0x006F) was flooded by messages that
      user program could not read fast enough. 146348 messages were lost.
      Signed-off-by: default avatarEric Dumazet <dada1@cosmosbay.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cb61cb9b
  24. 17 Jun, 2008 1 commit
  25. 15 Jun, 2008 1 commit
  26. 12 Jun, 2008 1 commit
  27. 04 Jun, 2008 1 commit
    • Denis V. Lunev's avatar
      raw: Raw socket leak. · 22dd4850
      Denis V. Lunev authored
      
      
      The program below just leaks the raw kernel socket
      
      int main() {
              int fd = socket(PF_INET, SOCK_RAW, IPPROTO_UDP);
              struct sockaddr_in addr;
      
              memset(&addr, 0, sizeof(addr));
              inet_aton("127.0.0.1", &addr.sin_addr);
              addr.sin_family = AF_INET;
              addr.sin_port = htons(2048);
              sendto(fd,  "a", 1, MSG_MORE, &addr, sizeof(addr));
              return 0;
      }
      
      Corked packet is allocated via sock_wmalloc which holds the owner socket,
      so one should uncork it and flush all pending data on close. Do this in the
      same way as in UDP.
      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>
      22dd4850
  28. 13 May, 2008 1 commit
  29. 01 Apr, 2008 1 commit
  30. 28 Mar, 2008 1 commit
  31. 25 Mar, 2008 4 commits
  32. 24 Mar, 2008 2 commits
  33. 22 Mar, 2008 1 commit
  34. 18 Mar, 2008 1 commit
  35. 01 Feb, 2008 2 commits