ipv6: catch ipv6.disable=1 kernel command line

Author: mtomaschewski

include/wicked/ipv6.h

@@ -61,6 +61,8 @@ struct ni_ipv6_devinfo {
 	ni_ipv6_ra_info_t	radv;
 };
 
+extern ni_bool_t		ni_ipv6_supported(void);
+
 extern ni_ipv6_devinfo_t *	ni_netdev_get_ipv6(ni_netdev_t *);
 extern void			ni_netdev_set_ipv6(ni_netdev_t *, ni_ipv6_devconf_t *);
 

src/dbus-objects/ipv6.c

@@ -55,7 +55,8 @@ ni_objectmodel_ipv6_change_protocol(ni_dbus_object_t *object, const ni_dbus_meth
 	}
 
 	if (ni_system_ipv6_setup(nc, dev, &cfg->ipv6->conf) < 0) {
-		dbus_set_error(error, DBUS_ERROR_FAILED, "failed to set up ethernet device");
+		dbus_set_error(error, DBUS_ERROR_FAILED,
+				"failed to configure ipv6 protocol");
 		goto out;
 	}
 

src/ifconfig.c

@@ -1319,7 +1319,7 @@ ni_system_ipv6_setup(ni_netconfig_t *nc, ni_netdev_t *dev, const ni_ipv6_devconf
 	 * seems rather good at that. 
 	 * The only way to recover from that is by upping the interface briefly.
 	 */
-	if (!ni_sysctl_ipv6_ifconfig_is_present(dev->name)) {
+	if (ni_ipv6_supported() && !ni_sysctl_ipv6_ifconfig_is_present(dev->name)) {
 		if (__ni_rtnl_link_up(dev, NULL) >= 0) {
 			unsigned int count = 100;
 

src/ipv6.c

@@ -9,13 +9,26 @@
 
 #include <wicked/netinfo.h>
 #include <wicked/logging.h>
+#include <errno.h>
 
 #include "ipv6_priv.h"
 #include "util_priv.h"
 #include "sysfs.h"
 
+#define NI_PROC_SYS_NET_IPV6_DIR	"/proc/sys/net/ipv6"
+
 #define NI_IPV6_RA_RDNSS_ADDRS_CHUNK	4
 
+/*
+ * Check if ipv6 is supported or disabled
+ * via ipv6.disabled=1 kernel command line.
+ */
+ni_bool_t
+ni_ipv6_supported(void)
+{
+	return ni_isdir(NI_PROC_SYS_NET_IPV6_DIR);
+}
+
 /*
  * Reset to ipv6 config defaults
  */
@@ -94,6 +107,13 @@ ni_system_ipv6_devinfo_get(ni_netdev_t *dev, ni_ipv6_devinfo_t *ipv6)
 	if (ipv6 == NULL)
 		ipv6 = ni_netdev_get_ipv6(dev);
 
+	if (!ni_ipv6_supported()) {
+		__ni_ipv6_devconf_reset(&ipv6->conf);
+		__ni_ipv6_ra_info_reset(&ipv6->radv);
+		ipv6->conf.enabled = NI_TRISTATE_DISABLE;
+		return 0;
+	}
+
 	/*
 	 * dhcpcd does something very odd when shutting down an interface;
 	 * in addition to removing all IPv4 addresses, it also removes any
@@ -157,6 +177,15 @@ ni_system_ipv6_devinfo_set(ni_netdev_t *dev, const ni_ipv6_devconf_t *conf)
 	if (!conf || !(ipv6 = ni_netdev_get_ipv6(dev)))
 		return -1;
 
+	if (!ni_ipv6_supported()) {
+		ipv6->conf.enabled = NI_TRISTATE_DISABLE;
+		if (ni_tristate_is_enabled(conf->enabled)) {
+			errno = EAFNOSUPPORT;
+			return -1;
+		}
+		return 0;
+	}
+
 	if (ni_tristate_is_set(conf->enabled)) {
 		if (__ni_system_ipv6_devinfo_change_int(dev->name, "disable_ipv6",
 				ni_tristate_is_enabled(conf->enabled) ? 0 : 1) < 0)