From 352ae1022ce19de28fc72e034cc469872ad79d06 Mon Sep 17 00:00:00 2001
From: aleksej <aleksej.paschenko@gmail.com>
Date: Sun, 27 Oct 2019 15:14:35 +0300
Subject: Add /proc/sys/net/ipv4/ip_forward

---
 pkg/tcpip/network/ipv4/ipv4.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'pkg/tcpip/network')

diff --git a/pkg/tcpip/network/ipv4/ipv4.go b/pkg/tcpip/network/ipv4/ipv4.go
index 1339f8474..90f4406e5 100644
--- a/pkg/tcpip/network/ipv4/ipv4.go
+++ b/pkg/tcpip/network/ipv4/ipv4.go
@@ -307,7 +307,9 @@ func (e *endpoint) WriteHeaderIncludedPacket(r *stack.Route, payload buffer.Vect
 		return nil
 	}
 
-	hdr := buffer.NewPrependableFromView(payload.ToView())
+	// If we want to send the packet to a link-layer,
+	// we have to reserve space for an Ethernet header.
+	hdr := buffer.NewPrependableFromView(payload.ToView(), int(e.linkEP.MaxHeaderLength()))
 	r.Stats().IP.PacketsSent.Increment()
 	return e.linkEP.WritePacket(r, nil /* gso */, hdr, buffer.VectorisedView{}, ProtocolNumber)
 }
-- 
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