[Qemu-devel] [Bug 1814352] Re: SIOCGIFNAME takes a struct ifreq not an integer

[Erik Kline]

Please let me know if further work or another patch submission is
required.

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https://bugs.launchpad.net/bugs/1814352

Title:
  SIOCGIFNAME takes a struct ifreq not an integer

Status in QEMU:
  Confirmed

Bug description:
  The ioctl SIOCGIFNAME takes a pointer to a struct ifreq, not an
  integer.  This leads to if_indextoname() not correctly returning
  interface names (well, not if they're longer than 4 characters
  including the trailing NULL ;-).

  This is observed on v3.1.0.

  The following one-line patch will be sent to the qemu-devel mailing
  list:

  """
  diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
  index ae8951625f..37501f575c 100644
  --- a/linux-user/ioctls.h
  +++ b/linux-user/ioctls.h
  @@ -178,7 +178,7 @@
   #endif /* CONFIG_USBFS */
   
     IOCTL(SIOCATMARK, IOC_R, MK_PTR(TYPE_INT))
  -  IOCTL(SIOCGIFNAME, IOC_RW, MK_PTR(TYPE_INT))
  +  IOCTL(SIOCGIFNAME, IOC_RW, MK_PTR(MK_STRUCT(STRUCT_int_ifreq)))
     IOCTL(SIOCGIFFLAGS, IOC_W | IOC_R, MK_PTR(MK_STRUCT(STRUCT_short_ifreq)))
     IOCTL(SIOCSIFFLAGS, IOC_W, MK_PTR(MK_STRUCT(STRUCT_short_ifreq)))
     IOCTL(SIOCGIFADDR, IOC_W | IOC_R, MK_PTR(MK_STRUCT(STRUCT_sockaddr_ifreq)))
  """

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