From 3dc09446771a3434ed948bdd5e6ca9f6ef9a9e76 Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Sun, 28 Aug 2016 13:52:32 +0200
Subject: [PATCH 1/2] platform: split processing result from do_change_link()

---
 src/platform/nm-linux-platform.c | 35 ++++++++++++++++++++++++--------
 1 file changed, 27 insertions(+), 8 deletions(-)

diff --git a/src/platform/nm-linux-platform.c b/src/platform/nm-linux-platform.c
index 67443aa853..338708a552 100644
--- a/src/platform/nm-linux-platform.c
+++ b/src/platform/nm-linux-platform.c
@@ -4061,18 +4061,14 @@ out:
 	return !!nmp_cache_lookup_obj (priv->cache, obj_id);
 }
 
-static NMPlatformError
-do_change_link (NMPlatform *platform,
-                int ifindex,
-                struct nl_msg *nlmsg)
+static WaitForNlResponseResult
+do_change_link_request (NMPlatform *platform,
+                        int ifindex,
+                        struct nl_msg *nlmsg)
 {
 	nm_auto_pop_netns NMPNetns *netns = NULL;
 	WaitForNlResponseResult seq_result = WAIT_FOR_NL_RESPONSE_RESULT_UNKNOWN;
 	int nle;
-	char s_buf[256];
-	NMPlatformError result = NM_PLATFORM_ERROR_SUCCESS;
-	NMLogLevel log_level = LOGL_DEBUG;
-	const char *log_result = "failure", *log_detail = "";
 
 	if (!nm_platform_netns_push (platform, &netns))
 		return NM_PLATFORM_ERROR_UNSPECIFIED;
@@ -4099,6 +4095,18 @@ retry:
 		nlmsg_hdr (nlmsg)->nlmsg_type = RTM_SETLINK;
 		goto retry;
 	}
+	return seq_result;
+}
+
+static NMPlatformError
+do_change_link_result (NMPlatform *platform,
+                       int ifindex,
+                       WaitForNlResponseResult seq_result)
+{
+	char s_buf[256];
+	NMPlatformError result = NM_PLATFORM_ERROR_SUCCESS;
+	NMLogLevel log_level = LOGL_DEBUG;
+	const char *log_result = "failure", *log_detail = "";
 
 	if (seq_result == WAIT_FOR_NL_RESPONSE_RESULT_RESPONSE_OK) {
 		log_result = "success";
@@ -4124,6 +4132,17 @@ retry:
 	return result;
 }
 
+static NMPlatformError
+do_change_link (NMPlatform *platform,
+                int ifindex,
+                struct nl_msg *nlmsg)
+{
+	WaitForNlResponseResult seq_result;
+
+	seq_result = do_change_link_request (platform, ifindex, nlmsg);
+	return do_change_link_result (platform, ifindex, seq_result);
+}
+
 static gboolean
 link_add (NMPlatform *platform,
           const char *name,

From 2bef71611bd9fd2e333a7522205f0262ac25680f Mon Sep 17 00:00:00 2001
From: Thomas Haller <thaller@redhat.com>
Date: Sun, 28 Aug 2016 14:08:42 +0200
Subject: [PATCH 2/2] platform: workaround kernel wrongly returning ENFILE when
 changing MAC address

https://bugzilla.gnome.org/show_bug.cgi?id=770456
---
 src/platform/nm-linux-platform.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/src/platform/nm-linux-platform.c b/src/platform/nm-linux-platform.c
index 338708a552..ad88c8e961 100644
--- a/src/platform/nm-linux-platform.c
+++ b/src/platform/nm-linux-platform.c
@@ -4450,6 +4450,8 @@ link_set_address (NMPlatform *platform, int ifindex, gconstpointer address, size
 {
 	nm_auto_nlmsg struct nl_msg *nlmsg = NULL;
 	gs_free char *mac = NULL;
+	WaitForNlResponseResult seq_result;
+	char s_buf[256];
 
 	if (!address || !length)
 		g_return_val_if_reached (NM_PLATFORM_ERROR_BUG);
@@ -4469,7 +4471,30 @@ link_set_address (NMPlatform *platform, int ifindex, gconstpointer address, size
 
 	NLA_PUT (nlmsg, IFLA_ADDRESS, length, address);
 
-	return do_change_link (platform, ifindex, nlmsg);
+	seq_result = do_change_link_request (platform, ifindex, nlmsg);
+
+	if (NM_IN_SET (-((int) seq_result), ENFILE)) {
+		const NMPObject *obj_cache;
+
+		/* workaround ENFILE which may be wrongly returned (bgo #770456).
+		 * If the MAC address is as expected, assume success? */
+
+		obj_cache = nmp_cache_lookup_link (NM_LINUX_PLATFORM_GET_PRIVATE (platform)->cache, ifindex);
+		if (   obj_cache
+		    && obj_cache->link.addr.len == length
+		    && memcmp (obj_cache->link.addr.data, address, length) == 0) {
+			_NMLOG (LOGL_DEBUG,
+			        "do-change-link[%d]: %s changing link: %s%s",
+			        ifindex,
+			        "success",
+			        wait_for_nl_response_to_string (seq_result, s_buf, sizeof (s_buf)),
+			        " (assume success changing address)");
+			return NM_PLATFORM_ERROR_SUCCESS;
+		}
+	}
+
+	return do_change_link_result (platform, ifindex, seq_result);
+
 nla_put_failure:
 	g_return_val_if_reached (NM_PLATFORM_ERROR_UNSPECIFIED);
 }