Port netstack, hostinet, and netlink sockets to VFS2.

All three follow the same pattern:
1. Refactor VFS1 sockets into socketOpsCommon, so that most of the methods can
   be shared with VFS2.
2. Create a FileDescriptionImpl with the corresponding socket operations,
   rewriting the few that cannot be shared with VFS1.
3. Set up a VFS2 socket provider that creates a socket by setting up a dentry
   in the global Kernel.socketMount and connecting it with a new
   FileDescription.

This mostly completes the work for porting sockets to VFS2, and many syscall
tests can be enabled as a result.
There are several networking-related syscall tests that are still not passing:
1. net gofer tests
2. socketpair gofer tests
2. sendfile tests (splice is not implemented in VFS2 yet)

Updates #1478, #1484, #1485

PiperOrigin-RevId: 309457331

1 files changed, 7 insertions, 2 deletions

diff --git a/pkg/sentry/fsimpl/gofer/socket.go b/pkg/sentry/fsimpl/gofer/socket.go
index 73835df91..d6dbe9092 100644
--- a/pkg/sentry/fsimpl/gofer/socket.go
+++ b/pkg/sentry/fsimpl/gofer/socket.go
@@ -87,7 +87,9 @@ func (e *endpoint) BidirectionalConnect(ctx context.Context, ce transport.Connec
 
 	returnConnect(c, c)
 	ce.Unlock()
-	c.Init()
+	if err := c.Init(); err != nil {
+		return syserr.FromError(err)
+	}
 
 	return nil
 }
@@ -99,7 +101,10 @@ func (e *endpoint) UnidirectionalConnect(ctx context.Context) (transport.Connect
 	if err != nil {
 		return nil, err
 	}
-	c.Init()
+
+	if err := c.Init(); err != nil {
+		return nil, syserr.FromError(err)
+	}
 
 	// We don't need the receiver.
 	c.CloseRecv()