From 92b9069b67b927cef25a1490ebd142ad6d65690d Mon Sep 17 00:00:00 2001 From: Nayana Bidari Date: Fri, 20 Mar 2020 12:00:21 -0700 Subject: Support owner matching for iptables. This feature will match UID and GID of the packet creator, for locally generated packets. This match is only valid in the OUTPUT and POSTROUTING chains. Forwarded packets do not have any socket associated with them. Packets from kernel threads do have a socket, but usually no owner. --- pkg/tcpip/transport/raw/endpoint.go | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'pkg/tcpip/transport/raw/endpoint.go') diff --git a/pkg/tcpip/transport/raw/endpoint.go b/pkg/tcpip/transport/raw/endpoint.go index 536dafd1e..337bc1c71 100644 --- a/pkg/tcpip/transport/raw/endpoint.go +++ b/pkg/tcpip/transport/raw/endpoint.go @@ -80,6 +80,9 @@ type endpoint struct { // Connect(), and is valid only when conneted is true. route stack.Route `state:"manual"` stats tcpip.TransportEndpointStats `state:"nosave"` + + // owner is used to get uid and gid of the packet. + owner tcpip.PacketOwner } // NewEndpoint returns a raw endpoint for the given protocols. @@ -159,6 +162,10 @@ func (e *endpoint) Close() { // ModerateRecvBuf implements tcpip.Endpoint.ModerateRecvBuf. func (e *endpoint) ModerateRecvBuf(copied int) {} +func (e *endpoint) SetOwner(owner tcpip.PacketOwner) { + e.owner = owner +} + // IPTables implements tcpip.Endpoint.IPTables. func (e *endpoint) IPTables() (stack.IPTables, error) { return e.stack.IPTables(), nil @@ -348,10 +355,12 @@ func (e *endpoint) finishWrite(payloadBytes []byte, route *stack.Route) (int64, } break } + hdr := buffer.NewPrependable(len(payloadBytes) + int(route.MaxHeaderLength())) if err := route.WritePacket(nil /* gso */, stack.NetworkHeaderParams{Protocol: e.TransProto, TTL: route.DefaultTTL(), TOS: stack.DefaultTOS}, stack.PacketBuffer{ Header: hdr, Data: buffer.View(payloadBytes).ToVectorisedView(), + Owner: e.owner, }); err != nil { return 0, nil, err } -- cgit v1.2.3