From d0e1bf21c6d017bc9d9c9c3f3d227655c8379178 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ji=C5=99=C3=AD=20Klime=C5=A1?= <jklimes@redhat.com>
Date: Fri, 7 Mar 2014 10:33:12 +0100
Subject: core: allow matching IPv6 'link-local' method to 'ignore' (rh
 #1073824)

When an existing connection profile has IPv6 method 'ignore', NM doesn't simply
care about IPv6. Thus we should allow matching such a profile to devices with
just a link-local address.

The example can be a simple configuration like this:
/etc/sysconfig/network-scripts/ifcfg-ens3:
DEVICE="ens3"
ONBOOT=yes
NETBOOT=yes
UUID="aa17d688-a38d-481d-888d-6d69cca781b8"
BOOTPROTO=dhcp
HWADDR="52:54:00:32:77:59"
TYPE=Ethernet
NAME="ens3"

https://bugzilla.redhat.com/show_bug.cgi?id=1073824
---
 src/NetworkManagerUtils.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/src/NetworkManagerUtils.c b/src/NetworkManagerUtils.c
index ae6bc504cc..c5823e80c3 100644
--- a/src/NetworkManagerUtils.c
+++ b/src/NetworkManagerUtils.c
@@ -685,6 +685,37 @@ check_ip6_method_link_local_auto (NMConnection *orig,
 	return FALSE;
 }
 
+static gboolean
+check_ip6_method_link_local_ignore (NMConnection *orig,
+                                    NMConnection *candidate,
+                                    GHashTable *settings)
+{
+	GHashTable *props;
+	const char *orig_ip6_method, *candidate_ip6_method;
+
+	props = g_hash_table_lookup (settings, NM_SETTING_IP6_CONFIG_SETTING_NAME);
+	if (   !props
+	    || (g_hash_table_size (props) != 1)
+	    || !g_hash_table_lookup (props, NM_SETTING_IP6_CONFIG_METHOD)) {
+		/* We only handle ipv6 'method' here */
+		return FALSE;
+	}
+
+	/* If the original connection method is 'link-local' and the candidate method
+	 * is 'ignore' we can take the connection, because NM didn't simply take care
+	 * of IPv6.
+	 */
+	orig_ip6_method = nm_utils_get_ip_config_method (orig, NM_TYPE_SETTING_IP6_CONFIG);
+	candidate_ip6_method = nm_utils_get_ip_config_method (candidate, NM_TYPE_SETTING_IP6_CONFIG);
+
+	if (   strcmp (orig_ip6_method, NM_SETTING_IP6_CONFIG_METHOD_LINK_LOCAL) == 0
+	    && strcmp (candidate_ip6_method, NM_SETTING_IP6_CONFIG_METHOD_IGNORE) == 0) {
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
 static gboolean
 check_ip4_method_disabled_auto (NMConnection *orig,
                                 NMConnection *candidate,
@@ -733,6 +764,9 @@ check_possible_match (NMConnection *orig,
 	if (check_ip6_method_link_local_auto (orig, candidate, settings))
 		return candidate;
 
+	if (check_ip6_method_link_local_ignore (orig, candidate, settings))
+		return candidate;
+
 	if (check_ip4_method_disabled_auto (orig, candidate, settings, device_has_carrier))
 		return candidate;
 
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