all: add support for route type "throw"

After adding support for "blackhole", "unreachable" and "prohibit" route
types, let's also add support for "throw" type. It works basically the
same as the other types, so supporting it seems very straight forward.

https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/merge_requests/1124

src/core/NetworkManagerUtils.c

@@ -1352,8 +1352,13 @@ nm_utils_ip_route_attribute_to_platform(int                addr_family,
         int type;
 
         type = nm_net_aux_rtnl_rtntype_a2n(g_variant_get_string(variant, NULL));
-        nm_assert(
+        nm_assert(NM_IN_SET(type,
-            NM_IN_SET(type, RTN_UNICAST, RTN_LOCAL, RTN_BLACKHOLE, RTN_UNREACHABLE, RTN_PROHIBIT));
+                            RTN_UNICAST,
+                            RTN_LOCAL,
+                            RTN_BLACKHOLE,
+                            RTN_UNREACHABLE,
+                            RTN_PROHIBIT,
+                            RTN_THROW));
 
         r->type_coerced = nm_platform_route_type_coerce(type);
     } else

src/core/platform/tests/test-platform-general.c

@@ -762,6 +762,7 @@ test_route_type_is_nodev(void)
         case RTN_BLACKHOLE:
         case RTN_UNREACHABLE:
         case RTN_PROHIBIT:
+        case RTN_THROW:
             is_nodev = TRUE;
             break;
         default:

src/core/platform/tests/test-route.c

@@ -1899,14 +1899,17 @@ test_blackhole(gconstpointer test_data)
     NMPlatformIPXRoute           rr = {};
     int                          r  = -1;
     int                          i;
+    guint8                       rtn_type;
+
+    rtn_type = nmtst_rand_select(RTN_BLACKHOLE, RTN_UNREACHABLE, RTN_PROHIBIT, RTN_THROW);
 
     if (IS_IPv4) {
         rr.r4 = (const NMPlatformIP4Route){
-            .type_coerced = nmtst_rand_select(RTN_BLACKHOLE, RTN_UNREACHABLE, RTN_PROHIBIT),
+            .type_coerced = nm_platform_route_type_coerce(rtn_type),
         };
     } else {
         rr.r6 = (const NMPlatformIP6Route){
-            .type_coerced = nmtst_rand_select(RTN_BLACKHOLE, RTN_UNREACHABLE, RTN_PROHIBIT),
+            .type_coerced = nm_platform_route_type_coerce(rtn_type),
             .metric       = 1000,
         };
     }

src/libnm-core-impl/nm-setting-ip-config.c

@@ -1390,7 +1390,8 @@ _ip_route_attribute_validate(const char           *name,
                        RTN_LOCAL,
                        RTN_BLACKHOLE,
                        RTN_UNREACHABLE,
-                       RTN_PROHIBIT)) {
+                       RTN_PROHIBIT,
+                       RTN_THROW)) {
             g_set_error(error,
                         NM_CONNECTION_ERROR,
                         NM_CONNECTION_ERROR_INVALID_PROPERTY,
@@ -1494,6 +1495,7 @@ _nm_ip_route_attribute_validate_all(const NMIPRoute *route, GError **error)
     case RTN_BLACKHOLE:
     case RTN_UNREACHABLE:
     case RTN_PROHIBIT:
+    case RTN_THROW:
         if (route->next_hop) {
             g_set_error(error,
                         NM_CONNECTION_ERROR,

src/libnm-core-impl/nm-setting-ip4-config.c

@@ -1006,7 +1006,8 @@ nm_setting_ip4_config_class_init(NMSettingIP4ConfigClass *klass)
      *      </listitem>
      *      <listitem>
      *        <para><literal>"type"</literal> - one of <literal>unicast</literal>, <literal>local</literal>, <literal>blackhole</literal>,
-     *          <literal>unavailable</literal>, <literal>prohibit</literal>. The default is <literal>unicast</literal>.</para>
+     *          <literal>unavailable</literal>, <literal>prohibit</literal>, <literal>throw</literal>.
+     *          The default is <literal>unicast</literal>.</para>
      *      </listitem>
      *      <listitem>
      *        <para><literal>"window"</literal> - an unsigned 32 bit integer.</para>

src/libnm-core-impl/nm-setting-ip6-config.c

@@ -1042,7 +1042,8 @@ nm_setting_ip6_config_class_init(NMSettingIP6ConfigClass *klass)
      *      </listitem>
      *      <listitem>
      *        <para><literal>"type"</literal> - one of <literal>unicast</literal>, <literal>local</literal>, <literal>blackhole</literal>,
-     *          <literal>unavailable</literal>, <literal>prohibit</literal>. The default is <literal>unicast</literal>.</para>
+     *          <literal>unavailable</literal>, <literal>prohibit</literal>, <literal>throw</literal>.
+     *          The default is <literal>unicast</literal>.</para>
      *      </listitem>
      *      <listitem>
      *        <para><literal>"window"</literal> - an unsigned 32 bit integer.</para>

src/libnm-platform/nm-linux-platform.c

@@ -3455,7 +3455,8 @@ _new_from_nl_route(struct nlmsghdr *nlh, gboolean id_only, ParseNlmsgIter *parse
                    RTN_LOCAL,
                    RTN_BLACKHOLE,
                    RTN_UNREACHABLE,
-                   RTN_PROHIBIT))
+                   RTN_PROHIBIT,
+                   RTN_THROW))
         return NULL;
 
     if (nlmsg_parse_arr(nlh, sizeof(struct rtmsg), tb, policy) < 0)

src/libnm-platform/nm-platform.h

@@ -1411,7 +1411,11 @@ _nm_platform_link_get_inet6_addr_gen_mode(const NMPlatformLink *pllink)
 static inline gboolean
 nm_platform_route_type_is_nodev(guint8 type)
 {
-    return NM_IN_SET(type, 6 /* RTN_BLACKHOLE */, 7 /* RTN_UNREACHABLE */, 8 /* RTN_PROHIBIT */);
+    return NM_IN_SET(type,
+                     6 /* RTN_BLACKHOLE */,
+                     7 /* RTN_UNREACHABLE */,
+                     8 /* RTN_PROHIBIT */,
+                     9 /* RTN_THROW */);
 }
 
 /**