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/abi/linux/socket.go | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'pkg/abi/linux')

diff --git a/pkg/abi/linux/socket.go b/pkg/abi/linux/socket.go
index 417840731..44bd69df6 100644
--- a/pkg/abi/linux/socket.go
+++ b/pkg/abi/linux/socket.go
@@ -200,6 +200,22 @@ const (
 	SS_DISCONNECTING = 4 // In process of disconnecting.
 )
 
+// TCP protocol states, from include/net/tcp_states.h.
+const (
+	TCP_ESTABLISHED uint32 = iota + 1
+	TCP_SYN_SENT
+	TCP_SYN_RECV
+	TCP_FIN_WAIT1
+	TCP_FIN_WAIT2
+	TCP_TIME_WAIT
+	TCP_CLOSE
+	TCP_CLOSE_WAIT
+	TCP_LAST_ACK
+	TCP_LISTEN
+	TCP_CLOSING
+	TCP_NEW_SYN_RECV
+)
+
 // SockAddrMax is the maximum size of a struct sockaddr, from
 // uapi/linux/socket.h.
 const SockAddrMax = 128
-- 
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