From 2d2831e3541c8ae3c84f17cfd1bf0a26f2027044 Mon Sep 17 00:00:00 2001
From: Rahat Mahmood <rahat@google.com>
Date: Thu, 6 Jun 2019 15:03:44 -0700
Subject: Track and export socket state.

This is necessary for implementing network diagnostic interfaces like
/proc/net/{tcp,udp,unix} and sock_diag(7).

For pass-through endpoints such as hostinet, we obtain the socket
state from the backend. For netstack, we add explicit tracking of TCP
states.

PiperOrigin-RevId: 251934850
---
 pkg/sentry/socket/epsocket/epsocket.go | 44 ++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'pkg/sentry/socket/epsocket/epsocket.go')

diff --git a/pkg/sentry/socket/epsocket/epsocket.go b/pkg/sentry/socket/epsocket/epsocket.go
index de4b963da..f91c5127a 100644
--- a/pkg/sentry/socket/epsocket/epsocket.go
+++ b/pkg/sentry/socket/epsocket/epsocket.go
@@ -52,6 +52,7 @@ import (
 	"gvisor.googlesource.com/gvisor/pkg/tcpip"
 	"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
 	"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
+	"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/tcp"
 	"gvisor.googlesource.com/gvisor/pkg/waiter"
 )
 
@@ -2281,3 +2282,46 @@ func nicStateFlagsToLinux(f stack.NICStateFlags) uint32 {
 	}
 	return rv
 }
+
+// State implements socket.Socket.State. State translates the internal state
+// returned by netstack to values defined by Linux.
+func (s *SocketOperations) State() uint32 {
+	if s.family != linux.AF_INET && s.family != linux.AF_INET6 {
+		// States not implemented for this socket's family.
+		return 0
+	}
+
+	if !s.isPacketBased() {
+		// TCP socket.
+		switch tcp.EndpointState(s.Endpoint.State()) {
+		case tcp.StateEstablished:
+			return linux.TCP_ESTABLISHED
+		case tcp.StateSynSent:
+			return linux.TCP_SYN_SENT
+		case tcp.StateSynRecv:
+			return linux.TCP_SYN_RECV
+		case tcp.StateFinWait1:
+			return linux.TCP_FIN_WAIT1
+		case tcp.StateFinWait2:
+			return linux.TCP_FIN_WAIT2
+		case tcp.StateTimeWait:
+			return linux.TCP_TIME_WAIT
+		case tcp.StateClose, tcp.StateInitial, tcp.StateBound, tcp.StateConnecting, tcp.StateError:
+			return linux.TCP_CLOSE
+		case tcp.StateCloseWait:
+			return linux.TCP_CLOSE_WAIT
+		case tcp.StateLastAck:
+			return linux.TCP_LAST_ACK
+		case tcp.StateListen:
+			return linux.TCP_LISTEN
+		case tcp.StateClosing:
+			return linux.TCP_CLOSING
+		default:
+			// Internal or unknown state.
+			return 0
+		}
+	}
+
+	// TODO(b/112063468): Export states for UDP, ICMP, and raw sockets.
+	return 0
+}
-- 
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