From 99988e45ed651f64e16e2f2663b06b4a1eee50d4 Mon Sep 17 00:00:00 2001
From: Nayana Bidari <nybidari@google.com>
Date: Wed, 27 Jan 2021 16:11:49 -0800
Subject: Add support for more fields in netstack for TCP_INFO

This CL adds support for the following fields:
- RTT, RTTVar, RTO
- send congestion window (sndCwnd) and send slow start threshold (sndSsthresh)
- congestion control state(CaState)
- ReorderSeen

PiperOrigin-RevId: 354195361
---
 pkg/abi/linux/socket.go | 12 ++++++++++++
 pkg/abi/linux/tcp.go    |  9 +++++++++
 2 files changed, 21 insertions(+)

(limited to 'pkg/abi/linux')

diff --git a/pkg/abi/linux/socket.go b/pkg/abi/linux/socket.go
index 8591acbf2..cb33c37bd 100644
--- a/pkg/abi/linux/socket.go
+++ b/pkg/abi/linux/socket.go
@@ -416,6 +416,18 @@ type TCPInfo struct {
 	RwndLimited uint64
 	// SndBufLimited is the time in microseconds limited by send buffer.
 	SndBufLimited uint64
+
+	Delievered   uint32
+	DelieveredCe uint32
+
+	// BytesSent is RFC4898 tcpEStatsPerfHCDataOctetsOut.
+	BytesSent uint64
+	// BytesRetrans is RFC4898 tcpEStatsPerfOctetsRetrans.
+	BytesRetrans uint64
+	// DSACKDups is RFC4898 tcpEStatsStackDSACKDups.
+	DSACKDups uint32
+	// ReordSeen is the number of reordering events seen.
+	ReordSeen uint32
 }
 
 // SizeOfTCPInfo is the binary size of a TCPInfo struct.
diff --git a/pkg/abi/linux/tcp.go b/pkg/abi/linux/tcp.go
index 2a8d4708b..1a3c0916f 100644
--- a/pkg/abi/linux/tcp.go
+++ b/pkg/abi/linux/tcp.go
@@ -59,3 +59,12 @@ const (
 	MAX_TCP_KEEPINTVL = 32767
 	MAX_TCP_KEEPCNT   = 127
 )
+
+// Congestion control states from include/uapi/linux/tcp.h.
+const (
+	TCP_CA_Open     = 0
+	TCP_CA_Disorder = 1
+	TCP_CA_CWR      = 2
+	TCP_CA_Recovery = 3
+	TCP_CA_Loss     = 4
+)
-- 
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