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| author | gVisor bot <gvisor-bot@google.com> | 2020-10-09 19:17:35 +0000 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2020-10-09 19:17:35 +0000 |
| commit | 578aece760dd47a06a686f82efab5b650807d4c5 (patch) | |
| tree | e57a1d077e19bf33dd2818e399557f7b359adbc5 /pkg/sentry/devices/tundev/tundev.go | |
| parent | 9774e9a0ca4110d88e5c4b4a59c188d5bedc0adc (diff) | |
| parent | 257703c050e5901aeb3734f200f5a6b41856b4d9 (diff) | |
Merge release-20200928.0-77-g257703c05 (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 |