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sentry: Adds the SIOCGIFNETMASK ioctl to epsocket.

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PiperOrigin-RevId: 195489319
Change-Id: I0841d41d042c6f91aa8d7f62c127213aa7953eac
This commit is contained in:
Kevin Krakauer
2018-05-04 16:22:31 -07:00
committed by Shentubot
parent f47174f06b
commit d70787d340
1 changed files with 14 additions and 1 deletions
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pkg/sentry/socket/epsocket/epsocket.go
+14 -1
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@@ -1109,7 +1109,20 @@ func (s *SocketOperations) interfaceIoctl(ctx context.Context, io usermem.IO, ar
case syscall.SIOCGIFNETMASK:
// Gets the network mask of a device.
// TODO: Implement.
for _, addr := range s.stack.InterfaceAddrs()[index] {
// This ioctl is only compatible with AF_INET addresses.
if addr.Family != linux.AF_INET {
continue
}
// Populate ifr.ifr_netmask (type sockaddr).
usermem.ByteOrder.PutUint16(ifr.Data[0:2], uint16(linux.AF_INET))
usermem.ByteOrder.PutUint16(ifr.Data[2:4], 0)
var mask uint32 = 0xffffffff << (32 - addr.PrefixLen)
// Netmask is expected to be returned as a big endian
// value.
binary.BigEndian.PutUint32(ifr.Data[4:8], mask)
break
}
default:
// Not a valid call.