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netstack: implement bridge devices

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Implement the core part. All packets are broadcast-ed to all ports. The next
step will be to implement forwarding and multicast group databases.

PiperOrigin-RevId: 644471256
This commit is contained in:
Andrei Vagin
2024-06-18 12:15:19 -07:00
committed by gVisor bot
parent 4b965591e9
commit 0d20b827d2
6 changed files with 517 additions and 0 deletions
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pkg/sentry/socket/netstack/stack.go
+49
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@@ -165,6 +165,21 @@ func (s *Stack) SetInterface(ctx context.Context, msg *nlmsg.Message) *syserr.Er
// Netstack interfaces are always up.
}
return s.setLink(tcpip.NICID(ifinfomsg.Index), attrs)
}
func (s *Stack) setLink(id tcpip.NICID, linkAttrs map[uint16]nlmsg.BytesView) *syserr.Error {
if v, ok := linkAttrs[linux.IFLA_MASTER]; ok {
master, ok := v.Uint32()
if !ok {
return syserr.ErrInvalidArgument
}
if master != 0 {
if err := s.Stack.SetNICCoordinator(id, tcpip.NICID(master)); err != nil {
return syserr.TranslateNetstackError(err)
}
}
}
return nil
}
@@ -232,6 +247,10 @@ func (s *Stack) newVeth(ctx context.Context, linkAttrs map[uint16]nlmsg.BytesVie
return syserr.TranslateNetstackError(err)
}
ep.SetStack(s.Stack, id)
if err := s.setLink(id, linkAttrs); err != nil {
peerEP.Close()
return err
}
if peerName == "" {
peerName = fmt.Sprintf("veth%d", peerID)
@@ -244,6 +263,34 @@ func (s *Stack) newVeth(ctx context.Context, linkAttrs map[uint16]nlmsg.BytesVie
return syserr.TranslateNetstackError(err)
}
peerEP.SetStack(peerStack.Stack, id)
if peerLinkAttrs != nil {
if err := s.setLink(peerID, peerLinkAttrs); err != nil {
peerStack.Stack.RemoveNIC(peerID)
peerEP.Close()
return err
}
}
return nil
}
func (s *Stack) newBridge(ctx context.Context, linkAttrs map[uint16]nlmsg.BytesView, linkInfoAttrs map[uint16]nlmsg.BytesView) *syserr.Error {
ifname := ""
if v, ok := linkAttrs[linux.IFLA_IFNAME]; ok {
ifname = v.String()
}
ep := stack.NewBridgeEndpoint(defaultMTU)
id := tcpip.NICID(s.Stack.UniqueID())
err := s.Stack.CreateNICWithOptions(id, ep, stack.NICOptions{
Name: ifname,
})
if err != nil {
return syserr.TranslateNetstackError(err)
}
if err := s.setLink(id, linkAttrs); err != nil {
return err
}
return nil
}
@@ -275,6 +322,8 @@ func (s *Stack) newInterface(ctx context.Context, msg *nlmsg.Message, linkAttrs
switch kind {
case "":
return syserr.ErrInvalidArgument
case "bridge":
return s.newBridge(ctx, linkAttrs, linkInfoAttrs)
case "veth":
return s.newVeth(ctx, linkAttrs, linkInfoAttrs)
}