Add FileDescriptionImpl for Unix sockets.

This change involves several steps:
- Refactor the VFS1 unix socket implementation to share methods between VFS1
  and VFS2 where possible. Re-implement the rest.
- Override the default PRead, Read, PWrite, Write, Ioctl, Release methods in
  FileDescriptionDefaultImpl.
- Add functions to create and initialize a new Dentry/Inode and FileDescription
  for a Unix socket file.

Updates #1476

PiperOrigin-RevId: 304689796

1 files changed, 4 insertions, 4 deletions

diff --git a/pkg/sentry/socket/netstack/netstack.go b/pkg/sentry/socket/netstack/netstack.go
index 06a5b53bc..5d0085462 100644
--- a/pkg/sentry/socket/netstack/netstack.go
+++ b/pkg/sentry/socket/netstack/netstack.go
@@ -940,7 +940,7 @@ func (s *SocketOperations) GetSockOpt(t *kernel.Task, level, name int, outPtr us
 
 // GetSockOpt can be used to implement the linux syscall getsockopt(2) for
 // sockets backed by a commonEndpoint.
-func GetSockOpt(t *kernel.Task, s socket.Socket, ep commonEndpoint, family int, skType linux.SockType, level, name, outLen int) (interface{}, *syserr.Error) {
+func GetSockOpt(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, family int, skType linux.SockType, level, name, outLen int) (interface{}, *syserr.Error) {
 	switch level {
 	case linux.SOL_SOCKET:
 		return getSockOptSocket(t, s, ep, family, skType, name, outLen)
@@ -966,7 +966,7 @@ func GetSockOpt(t *kernel.Task, s socket.Socket, ep commonEndpoint, family int,
 }
 
 // getSockOptSocket implements GetSockOpt when level is SOL_SOCKET.
-func getSockOptSocket(t *kernel.Task, s socket.Socket, ep commonEndpoint, family int, skType linux.SockType, name, outLen int) (interface{}, *syserr.Error) {
+func getSockOptSocket(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, family int, skType linux.SockType, name, outLen int) (interface{}, *syserr.Error) {
 	// TODO(b/124056281): Stop rejecting short optLen values in getsockopt.
 	switch name {
 	case linux.SO_ERROR:
@@ -1541,7 +1541,7 @@ func (s *SocketOperations) SetSockOpt(t *kernel.Task, level int, name int, optVa
 
 // SetSockOpt can be used to implement the linux syscall setsockopt(2) for
 // sockets backed by a commonEndpoint.
-func SetSockOpt(t *kernel.Task, s socket.Socket, ep commonEndpoint, level int, name int, optVal []byte) *syserr.Error {
+func SetSockOpt(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, level int, name int, optVal []byte) *syserr.Error {
 	switch level {
 	case linux.SOL_SOCKET:
 		return setSockOptSocket(t, s, ep, name, optVal)
@@ -1568,7 +1568,7 @@ func SetSockOpt(t *kernel.Task, s socket.Socket, ep commonEndpoint, level int, n
 }
 
 // setSockOptSocket implements SetSockOpt when level is SOL_SOCKET.
-func setSockOptSocket(t *kernel.Task, s socket.Socket, ep commonEndpoint, name int, optVal []byte) *syserr.Error {
+func setSockOptSocket(t *kernel.Task, s socket.SocketOps, ep commonEndpoint, name int, optVal []byte) *syserr.Error {
 	switch name {
 	case linux.SO_SNDBUF:
 		if len(optVal) < sizeOfInt32 {