diff options
| author | Kevin Krakauer <krakauer@google.com> | 2019-10-21 13:21:58 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2019-10-21 13:23:18 -0700 |
| commit | 12235d533ae5c8b4b03c6d7f24cae785a2d6ec22 (patch) | |
| tree | 5abb8c6990f18af17a3889de637befc88b302a8e /pkg/tcpip/transport/udp/protocol.go | |
| parent | 652f7b1d0fef6f522baaed091d4820a48014092c (diff) | |
AF_PACKET support for netstack (aka epsocket).
Like (AF_INET, SOCK_RAW) sockets, AF_PACKET sockets require CAP_NET_RAW. With
runsc, you'll need to pass `--net-raw=true` to enable them.
Binding isn't supported yet.
PiperOrigin-RevId: 275909366
Diffstat (limited to 'pkg/tcpip/transport/udp/protocol.go')
| -rw-r--r-- | pkg/tcpip/transport/udp/protocol.go | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/pkg/tcpip/transport/udp/protocol.go b/pkg/tcpip/transport/udp/protocol.go index de026880f..5c3358a5e 100644 --- a/pkg/tcpip/transport/udp/protocol.go +++ b/pkg/tcpip/transport/udp/protocol.go @@ -121,8 +121,15 @@ func (p *protocol) HandleUnknownDestinationPacket(r *stack.Route, id stack.Trans payloadLen = available } - payload := buffer.NewVectorisedView(len(netHeader), []buffer.View{netHeader}) - payload.Append(vv) + // The buffers used by vv and netHeader may be used elsewhere + // in the system. For example, a raw or packet socket may use + // what UDP considers an unreachable destination. Thus we deep + // copy vv and netHeader to prevent multiple ownership and SR + // errors. + newNetHeader := make(buffer.View, len(netHeader)) + copy(newNetHeader, netHeader) + payload := buffer.NewVectorisedView(len(newNetHeader), []buffer.View{newNetHeader}) + payload.Append(vv.ToView().ToVectorisedView()) payload.CapLength(payloadLen) hdr := buffer.NewPrependable(headerLen) |