From b8e22e241cab625d2809034c74d0ff808b948b4c Mon Sep 17 00:00:00 2001
From: gVisor bot <gvisor-bot@google.com>
Date: Tue, 11 Feb 2020 12:58:13 -0800
Subject: Disallow duplicate NIC names.

PiperOrigin-RevId: 294500858
---
 runsc/sandbox/network.go | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

(limited to 'runsc')

diff --git a/runsc/sandbox/network.go b/runsc/sandbox/network.go
index ff48f5646..99e143696 100644
--- a/runsc/sandbox/network.go
+++ b/runsc/sandbox/network.go
@@ -174,13 +174,13 @@ func createInterfacesAndRoutesFromNS(conn *urpc.Client, nsPath string, hardwareG
 			return fmt.Errorf("fetching interface addresses for %q: %v", iface.Name, err)
 		}
 
-		// We build our own loopback devices.
+		// We build our own loopback device.
 		if iface.Flags&net.FlagLoopback != 0 {
-			links, err := loopbackLinks(iface, allAddrs)
+			link, err := loopbackLink(iface, allAddrs)
 			if err != nil {
-				return fmt.Errorf("getting loopback routes and links for iface %q: %v", iface.Name, err)
+				return fmt.Errorf("getting loopback link for iface %q: %v", iface.Name, err)
 			}
-			args.LoopbackLinks = append(args.LoopbackLinks, links...)
+			args.LoopbackLinks = append(args.LoopbackLinks, link)
 			continue
 		}
 
@@ -339,25 +339,25 @@ func createSocket(iface net.Interface, ifaceLink netlink.Link, enableGSO bool) (
 	return &socketEntry{deviceFile, gsoMaxSize}, nil
 }
 
-// loopbackLinks collects the links for a loopback interface.
-func loopbackLinks(iface net.Interface, addrs []net.Addr) ([]boot.LoopbackLink, error) {
-	var links []boot.LoopbackLink
+// loopbackLink returns the link with addresses and routes for a loopback
+// interface.
+func loopbackLink(iface net.Interface, addrs []net.Addr) (boot.LoopbackLink, error) {
+	link := boot.LoopbackLink{
+		Name: iface.Name,
+	}
 	for _, addr := range addrs {
 		ipNet, ok := addr.(*net.IPNet)
 		if !ok {
-			return nil, fmt.Errorf("address is not IPNet: %+v", addr)
+			return boot.LoopbackLink{}, fmt.Errorf("address is not IPNet: %+v", addr)
 		}
 		dst := *ipNet
 		dst.IP = dst.IP.Mask(dst.Mask)
-		links = append(links, boot.LoopbackLink{
-			Name:      iface.Name,
-			Addresses: []net.IP{ipNet.IP},
-			Routes: []boot.Route{{
-				Destination: dst,
-			}},
+		link.Addresses = append(link.Addresses, ipNet.IP)
+		link.Routes = append(link.Routes, boot.Route{
+			Destination: dst,
 		})
 	}
-	return links, nil
+	return link, nil
 }
 
 // routesForIface iterates over all routes for the given interface and converts
-- 
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