platform: add capability to set the tokenized interface identifier

We don't need the token set in platform for our address mode generation,
but having it set makes it possible to correctly generate and assume
connections that use tokens.

src/platform/nm-linux-platform.c

@@ -1954,7 +1954,8 @@ nmp_object_new_from_nl (NMPlatform *platform, const NMPCache *cache, struct nl_m
 
 static gboolean
 _nl_msg_new_link_set_afspec (struct nl_msg *msg,
-                             int addr_gen_mode)
+                             int addr_gen_mode,
+                             NMUtilsIPv6IfaceId *iid)
 {
 	struct nlattr *af_spec;
 	struct nlattr *af_attr;
@@ -1964,12 +1965,20 @@ _nl_msg_new_link_set_afspec (struct nl_msg *msg,
 	if (!(af_spec = nla_nest_start (msg, IFLA_AF_SPEC)))
 		goto nla_put_failure;
 
-	if (addr_gen_mode >= 0) {
+	if (addr_gen_mode >= 0 || iid) {
 		if (!(af_attr = nla_nest_start (msg, AF_INET6)))
 			goto nla_put_failure;
 
+		if (addr_gen_mode >= 0)
 			NLA_PUT_U8 (msg, IFLA_INET6_ADDR_GEN_MODE, addr_gen_mode);
 
+		if (iid) {
+			struct in6_addr i6_token = { .s6_addr = { 0, } };
+
+			nm_utils_ipv6_addr_set_interface_identifier (&i6_token, *iid);
+			NLA_PUT (msg, IFLA_INET6_TOKEN, sizeof (struct in6_addr), &i6_token);
+		}
+
 		nla_nest_end (msg, af_attr);
 	}
 
@@ -4329,8 +4338,22 @@ link_set_user_ipv6ll_enabled (NMPlatform *platform, int ifindex, gboolean enable
 	                          0,
 	                          0);
 	if (   !nlmsg
-	    || !_nl_msg_new_link_set_afspec (nlmsg,
+	    || !_nl_msg_new_link_set_afspec (nlmsg, mode, NULL))
-	                                     mode))
+		g_return_val_if_reached (FALSE);
+
+	return do_change_link (platform, ifindex, nlmsg) == NM_PLATFORM_ERROR_SUCCESS;
+}
+
+static gboolean
+link_set_token (NMPlatform *platform, int ifindex, NMUtilsIPv6IfaceId iid)
+{
+	nm_auto_nlmsg struct nl_msg *nlmsg = NULL;
+
+	_LOGD ("link: change %d: token: set IPv6 address generation token to %s",
+	       ifindex, nm_utils_inet6_interface_identifier_to_token (iid, NULL));
+
+	nlmsg = _nl_msg_new_link (RTM_NEWLINK, 0, ifindex, NULL, 0, 0);
+	if (!nlmsg || !_nl_msg_new_link_set_afspec (nlmsg, -1, &iid))
 		g_return_val_if_reached (FALSE);
 
 	return do_change_link (platform, ifindex, nlmsg) == NM_PLATFORM_ERROR_SUCCESS;
@@ -6442,6 +6465,7 @@ nm_linux_platform_class_init (NMLinuxPlatformClass *klass)
 	platform_class->link_get_udev_device = link_get_udev_device;
 
 	platform_class->link_set_user_ipv6ll_enabled = link_set_user_ipv6ll_enabled;
+	platform_class->link_set_token = link_set_token;
 
 	platform_class->link_set_address = link_set_address;
 	platform_class->link_get_permanent_address = link_get_permanent_address;

src/platform/nm-platform.c

@@ -899,6 +899,29 @@ nm_platform_link_uses_arp (NMPlatform *self, int ifindex)
 	return !NM_FLAGS_HAS (_link_get_flags (self, ifindex), IFF_NOARP);
 }
 
+/**
+ * nm_platform_link_set_ipv6_token:
+ * @self: platform instance
+ * @ifindex: Interface index
+ * @iid: Tokenized interface identifier
+ *
+ * Sets then IPv6 tokenized interface identifier.
+ *
+ * Returns: %TRUE a tokenized identifier was available
+ */
+gboolean
+nm_platform_link_set_ipv6_token (NMPlatform *self, int ifindex, NMUtilsIPv6IfaceId iid)
+{
+	_CHECK_SELF (self, klass, FALSE);
+
+	g_return_val_if_fail (ifindex >= 0, FALSE);
+	g_return_val_if_fail (iid.id, FALSE);
+
+	if (klass->link_set_token)
+		return klass->link_set_token (self, ifindex, iid);
+	return FALSE;
+}
+
 const char *
 nm_platform_link_get_udi (NMPlatform *self, int ifindex)
 {

src/platform/nm-platform.h

@@ -520,6 +520,7 @@ typedef struct {
 	GObject *(*link_get_udev_device) (NMPlatform *self, int ifindex);
 
 	gboolean (*link_set_user_ipv6ll_enabled) (NMPlatform *, int ifindex, gboolean enabled);
+	gboolean (*link_set_token) (NMPlatform *, int ifindex, NMUtilsIPv6IfaceId iid);
 
 	gboolean (*link_get_permanent_address) (NMPlatform *,
 	                                        int ifindex,
@@ -753,6 +754,7 @@ const char *nm_platform_link_get_udi (NMPlatform *self, int ifindex);
 GObject *nm_platform_link_get_udev_device (NMPlatform *self, int ifindex);
 
 gboolean nm_platform_link_set_user_ipv6ll_enabled (NMPlatform *self, int ifindex, gboolean enabled);
+gboolean nm_platform_link_set_ipv6_token (NMPlatform *self, int ifindex, NMUtilsIPv6IfaceId iid);
 
 gboolean nm_platform_link_get_permanent_address (NMPlatform *self, int ifindex, guint8 *buf, size_t *length);
 gboolean nm_platform_link_set_address (NMPlatform *self, int ifindex, const void *address, size_t length);