1. 07 Jun, 2015 3 commits
    • Colin Ian King's avatar
      fddi: print an address with %p format specifier rather than %x · 908e80d6
      Colin Ian King authored
      The debug is printing the struct smt_header * address using
      the %x format specifier. Fix it to use %p instead.
      Signed-off-by: default avatarColin Ian King <colin.king@canonical.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      908e80d6
    • Nicholas Mc Guire's avatar
      wan: dscc4: fix build warning Wunused-but-set-variable · c5726d26
      Nicholas Mc Guire authored
      Fix:
      drivers/net/wan/dscc4.c: In function 'dscc4_open':
      drivers/net/wan/dscc4.c:1049:25: warning: variable 'ppriv' set but not used
      [-Wunused-but-set-variable]
      
      This has been in there unused since 1da177e4 (Linux-2.6.12-rc2) simply
      remove it.
      Signed-off-by: default avatarNicholas Mc Guire <hofrat@osadl.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c5726d26
    • Eric Dumazet's avatar
      inet: add IP_BIND_ADDRESS_NO_PORT to overcome bind(0) limitations · 90c337da
      Eric Dumazet authored
      When an application needs to force a source IP on an active TCP socket
      it has to use bind(IP, port=x).
      
      As most applications do not want to deal with already used ports, x is
      often set to 0, meaning the kernel is in charge to find an available
      port.
      But kernel does not know yet if this socket is going to be a listener or
      be connected.
      It has very limited choices (no full knowledge of final 4-tuple for a
      connect())
      
      With limited ephemeral port range (about 32K ports), it is very easy to
      fill the space.
      
      This patch adds a new SOL_IP socket option, asking kernel to ignore
      the 0 port provided by application in bind(IP, port=0) and only
      remember the given IP address.
      
      The port will be automatically chosen at connect() time, in a way
      that allows sharing a source port as long as the 4-tuples are unique.
      
      This new feature is available for both IPv4 and IPv6 (Thanks Neal)
      
      Tested:
      
      Wrote a test program and checked its behavior on IPv4 and IPv6.
      
      strace(1) shows sequences of bind(IP=127.0.0.2, port=0) followed by
      connect().
      Also getsockname() show that the port is still 0 right after bind()
      but properly allocated after connect().
      
      socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 5
      setsockopt(5, SOL_IP, IP_BIND_ADDRESS_NO_PORT, [1], 4) = 0
      bind(5, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0
      getsockname(5, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
      connect(5, {sa_family=AF_INET, sin_port=htons(53174), sin_addr=inet_addr("127.0.0.3")}, 16) = 0
      getsockname(5, {sa_family=AF_INET, sin_port=htons(38050), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0
      
      IPv6 test :
      
      socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 7
      setsockopt(7, SOL_IP, IP_BIND_ADDRESS_NO_PORT, [1], 4) = 0
      bind(7, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
      getsockname(7, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 0
      connect(7, {sa_family=AF_INET6, sin6_port=htons(57300), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0
      getsockname(7, {sa_family=AF_INET6, sin6_port=htons(60964), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 0
      
      I was able to bind()/connect() a million concurrent IPv4 sockets,
      instead of ~32000 before patch.
      
      lpaa23:~# ulimit -n 1000010
      lpaa23:~# ./bind --connect --num-flows=1000000 &
      1000000 sockets
      
      lpaa23:~# grep TCP /proc/net/sockstat
      TCP: inuse 2000063 orphan 0 tw 47 alloc 2000157 mem 66
      
      Check that a given source port is indeed used by many different
      connections :
      
      lpaa23:~# ss -t src :40000 | head -10
      State      Recv-Q Send-Q   Local Address:Port          Peer Address:Port
      ESTAB      0      0           127.0.0.2:40000         127.0.202.33:44983
      ESTAB      0      0           127.0.0.2:40000         127.2.27.240:44983
      ESTAB      0      0           127.0.0.2:40000           127.2.98.5:44983
      ESTAB      0      0           127.0.0.2:40000        127.0.124.196:44983
      ESTAB      0      0           127.0.0.2:40000         127.2.139.38:44983
      ESTAB      0      0           127.0.0.2:40000          127.1.59.80:44983
      ESTAB      0      0           127.0.0.2:40000          127.3.6.228:44983
      ESTAB      0      0           127.0.0.2:40000          127.0.38.53:44983
      ESTAB      0      0           127.0.0.2:40000         127.1.197.10:44983
      Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      90c337da
  2. 06 Jun, 2015 8 commits
  3. 04 Jun, 2015 29 commits