From 37bb6facfc467179d6cfe6186ad6d5a55285c2c7 Mon Sep 17 00:00:00 2001
From: Laine Stump <laine@laine.org>
Date: Mon, 7 Jan 2019 15:55:31 -0500
Subject: [PATCH] util: add a function to insert new interfaces to
 IPv6CheckForwarding list

This same operation needs to be done in multiple places, so move the
inline code into a separate function.

Signed-off-by: Laine Stump <laine@laine.org>
Reviewed-by: Erik Skultety <eskultet@redhat.com>
---
 src/util/virnetdevip.c | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/src/util/virnetdevip.c b/src/util/virnetdevip.c
index 4c869739ee..72048e4b45 100644
--- a/src/util/virnetdevip.c
+++ b/src/util/virnetdevip.c
@@ -505,6 +505,25 @@ struct virNetDevIPCheckIPv6ForwardingData {
     size_t ndevices;
 };
 
+
+static int
+virNetDevIPCheckIPv6ForwardingAddIF(struct virNetDevIPCheckIPv6ForwardingData *data,
+                                    char **ifname)
+{
+    size_t i;
+
+    /* add ifname to the array if it's not already there
+     * (ifname is char** so VIR_APPEND_ELEMENT() will move the
+     * original pointer out of the way and avoid having it freed)
+     */
+    for (i = 0; i < data->ndevices; i++) {
+        if (STREQ(data->devices[i], *ifname))
+            return 0;
+    }
+    return VIR_APPEND_ELEMENT(data->devices, data->ndevices, *ifname);
+}
+
+
 static int
 virNetDevIPCheckIPv6ForwardingCallback(struct nlmsghdr *resp,
                                        void *opaque)
@@ -515,8 +534,6 @@ virNetDevIPCheckIPv6ForwardingCallback(struct nlmsghdr *resp,
     struct virNetDevIPCheckIPv6ForwardingData *data = opaque;
     int len = RTM_PAYLOAD(resp);
     int oif = -1;
-    size_t i;
-    bool hasDevice;
     VIR_AUTOFREE(char *) ifname = NULL;
 
     /* Ignore messages other than route ones */
@@ -553,13 +570,7 @@ virNetDevIPCheckIPv6ForwardingCallback(struct nlmsghdr *resp,
     accept_ra = virNetDevIPGetAcceptRA(ifname);
     VIR_DEBUG("Checking route for device %s, accept_ra: %d", ifname, accept_ra);
 
-    hasDevice = false;
-    for (i = 0; i < data->ndevices && !hasDevice; i++) {
-        if (STREQ(data->devices[i], ifname))
-            hasDevice = true;
-    }
-    if (accept_ra != 2 && !hasDevice &&
-        VIR_APPEND_ELEMENT(data->devices, data->ndevices, ifname) < 0)
+    if (accept_ra != 2 && virNetDevIPCheckIPv6ForwardingAddIF(data, &ifname) < 0)
         return -1;
 
     return 0;
-- 
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