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| author | gVisor bot <gvisor-bot@google.com> | 2020-10-08 23:23:14 +0000 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-10-08 23:23:14 +0000 |
| commit | 0482839af380d44348da12e87886f83b9ccf4393 (patch) | |
| tree | 8ab1aa036613a198c1b8bcce7eebc41c9161efd5 /pkg/sentry/devices/tundev/tundev.go | |
| parent | 4ff834dbeae1c6eac13342f00769dcf11078a79d (diff) | |
| parent | 6768e6c59ec252854a1633e184b69dc5723ac3f3 (diff) | |
Merge release-20200928.0-71-g6768e6c59 (automated)
Diffstat (limited to 'pkg/sentry/devices/tundev/tundev.go')
| -rw-r--r-- | pkg/sentry/devices/tundev/tundev.go | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/pkg/sentry/devices/tundev/tundev.go b/pkg/sentry/devices/tundev/tundev.go index 0b701a289..655ea549b 100644 --- a/pkg/sentry/devices/tundev/tundev.go +++ b/pkg/sentry/devices/tundev/tundev.go @@ -16,6 +16,8 @@ package tundev import ( + "fmt" + "gvisor.dev/gvisor/pkg/abi/linux" "gvisor.dev/gvisor/pkg/context" "gvisor.dev/gvisor/pkg/sentry/arch" @@ -26,6 +28,7 @@ import ( "gvisor.dev/gvisor/pkg/sentry/vfs" "gvisor.dev/gvisor/pkg/syserror" "gvisor.dev/gvisor/pkg/tcpip/link/tun" + "gvisor.dev/gvisor/pkg/tcpip/network/arp" "gvisor.dev/gvisor/pkg/usermem" "gvisor.dev/gvisor/pkg/waiter" ) @@ -84,7 +87,16 @@ func (fd *tunFD) Ioctl(ctx context.Context, uio usermem.IO, args arch.SyscallArg return 0, err } flags := usermem.ByteOrder.Uint16(req.Data[:]) - return 0, fd.device.SetIff(stack.Stack, req.Name(), flags) + created, err := fd.device.SetIff(stack.Stack, req.Name(), flags) + if err == nil && created { + // Always start with an ARP address for interfaces so they can handle ARP + // packets. + nicID := fd.device.NICID() + if err := stack.Stack.AddAddress(nicID, arp.ProtocolNumber, arp.ProtocolAddress); err != nil { + panic(fmt.Sprintf("failed to add ARP address after creating new TUN/TAP interface with ID = %d", nicID)) + } + } + return 0, err case linux.TUNGETIFF: var req linux.IFReq |