src/libsystemd/sd-rtnl/rtnl-types.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2014 Tom Gundersen <teg@jklm.no>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <stddef.h>
  23 #include <stdint.h>
  24 #include <sys/socket.h>
  25 #include <linux/netlink.h>
  26 #include <linux/rtnetlink.h>
  27 #include <linux/in6.h>
  28 #include <linux/veth.h>
  29 #include <linux/if_bridge.h>
  30 #include <linux/if_addr.h>
  31 #include <linux/if.h>
  32
  33 #include <linux/ip.h>
  34 #include <linux/if_tunnel.h>
  35
  36 #include "macro.h"
  37 #include "util.h"
  38
  39 #include "rtnl-types.h"
  40 #include "missing.h"
  41
  42 static const NLTypeSystem rtnl_link_type_system;
  43
  44 static const NLType rtnl_link_info_data_veth_types[VETH_INFO_MAX + 1] = {
  45         [VETH_INFO_PEER]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
  46 };
  47
  48
  49 static const NLType rtnl_link_info_data_macvlan_types[IFLA_MACVLAN_MAX + 1] = {
  50         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
  51         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
  52 };
  53
  54 static const NLType rtnl_link_info_data_bridge_types[IFLA_BRIDGE_MAX + 1] = {
  55         [IFLA_BRIDGE_FLAGS]     = { .type = NLA_U16 },
  56         [IFLA_BRIDGE_MODE]      = { .type = NLA_U16 },
  57 /*
  58         [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
  59                                     .len = sizeof(struct bridge_vlan_info), },
  60 */
  61 };
  62
  63 static const NLType rtnl_link_info_data_vlan_types[IFLA_VLAN_MAX + 1] = {
  64         [IFLA_VLAN_ID]          = { .type = NLA_U16 },
  65 /*
  66         [IFLA_VLAN_FLAGS]       = { .len = sizeof(struct ifla_vlan_flags) },
  67         [IFLA_VLAN_EGRESS_QOS]  = { .type = NLA_NESTED },
  68         [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
  69 */
  70         [IFLA_VLAN_PROTOCOL]    = { .type = NLA_U16 },
  71 };
  72
  73 static const NLType rtnl_link_info_data_vxlan_types[IFLA_VXLAN_MAX+1] = {
  74         [IFLA_VXLAN_ID] = { .type = NLA_U32 },
  75         [IFLA_VXLAN_GROUP] = {.type = NLA_IN_ADDR },
  76         [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
  77         [IFLA_VXLAN_LOCAL] = { .type = NLA_U32},
  78         [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
  79         [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
  80         [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
  81         [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
  82         [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
  83         [IFLA_VXLAN_PORT_RANGE] = { .type = NLA_U32},
  84         [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
  85         [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
  86         [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
  87         [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
  88 };
  89
  90 static const NLType rtnl_link_info_data_bond_types[IFLA_BOND_MAX + 1] = {
  91         [IFLA_BOND_MODE]                = { .type = NLA_U8 },
  92         [IFLA_BOND_ACTIVE_SLAVE]        = { .type = NLA_U32 },
  93 #ifdef IFLA_BOND_MIIMON
  94         [IFLA_BOND_MIIMON]              = { .type = NLA_U32 },
  95         [IFLA_BOND_UPDELAY]             = { .type = NLA_U32 },
  96         [IFLA_BOND_DOWNDELAY]           = { .type = NLA_U32 },
  97         [IFLA_BOND_USE_CARRIER]         = { .type = NLA_U8 },
  98         [IFLA_BOND_ARP_INTERVAL]        = { .type = NLA_U32 },
  99 /*
 100         [IFLA_BOND_ARP_IP_TARGET]       = { .type = NLA_NESTED },
 101 */
 102         [IFLA_BOND_ARP_VALIDATE]        = { .type = NLA_U32 },
 103         [IFLA_BOND_ARP_ALL_TARGETS]     = { .type = NLA_U32 },
 104         [IFLA_BOND_PRIMARY]             = { .type = NLA_U32 },
 105         [IFLA_BOND_PRIMARY_RESELECT]    = { .type = NLA_U8 },
 106         [IFLA_BOND_FAIL_OVER_MAC]       = { .type = NLA_U8 },
 107         [IFLA_BOND_XMIT_HASH_POLICY]    = { .type = NLA_U8 },
 108         [IFLA_BOND_RESEND_IGMP]         = { .type = NLA_U32 },
 109         [IFLA_BOND_NUM_PEER_NOTIF]      = { .type = NLA_U8 },
 110         [IFLA_BOND_ALL_SLAVES_ACTIVE]   = { .type = NLA_U8 },
 111         [IFLA_BOND_MIN_LINKS]           = { .type = NLA_U32 },
 112         [IFLA_BOND_LP_INTERVAL]         = { .type = NLA_U32 },
 113         [IFLA_BOND_PACKETS_PER_SLAVE]   = { .type = NLA_U32 },
 114         [IFLA_BOND_AD_LACP_RATE]        = { .type = NLA_U8 },
 115         [IFLA_BOND_AD_SELECT]           = { .type = NLA_U8 },
 116 /*
 117         [IFLA_BOND_AD_INFO]             = { .type = NLA_NESTED },
 118 */
 119 #endif
 120 };
 121
 122 static const NLType rtnl_link_info_data_iptun_types[IFLA_IPTUN_MAX + 1] = {
 123         [IFLA_IPTUN_LINK]                = { .type = NLA_U32 },
 124         [IFLA_IPTUN_LOCAL]               = { .type = NLA_IN_ADDR },
 125         [IFLA_IPTUN_REMOTE]              = { .type = NLA_IN_ADDR },
 126         [IFLA_IPTUN_TTL]                 = { .type = NLA_U8 },
 127         [IFLA_IPTUN_TOS]                 = { .type = NLA_U8 },
 128         [IFLA_IPTUN_PMTUDISC]            = { .type = NLA_U8 },
 129         [IFLA_IPTUN_FLAGS]               = { .type = NLA_U16 },
 130         [IFLA_IPTUN_PROTO]               = { .type = NLA_U8 },
 131         [IFLA_IPTUN_6RD_PREFIX]          = { .type = NLA_IN_ADDR },
 132         [IFLA_IPTUN_6RD_RELAY_PREFIX]    = { .type = NLA_U32 },
 133         [IFLA_IPTUN_6RD_PREFIXLEN]       = { .type = NLA_U16 },
 134         [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
 135 };
 136
 137 static  const NLType rtnl_link_info_data_ipgre_types[IFLA_GRE_MAX + 1] = {
 138         [IFLA_GRE_LINK]     = { .type = NLA_U32 },
 139         [IFLA_GRE_IFLAGS]   = { .type = NLA_U16 },
 140         [IFLA_GRE_OFLAGS]   = { .type = NLA_U16 },
 141         [IFLA_GRE_IKEY]     = { .type = NLA_U32 },
 142         [IFLA_GRE_OKEY]     = { .type = NLA_U32 },
 143         [IFLA_GRE_LOCAL]    = { .type = NLA_IN_ADDR },
 144         [IFLA_GRE_REMOTE]   = { .type = NLA_IN_ADDR },
 145         [IFLA_GRE_TTL]      = { .type = NLA_U8 },
 146         [IFLA_GRE_TOS]      = { .type = NLA_U8 },
 147         [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 },
 148 };
 149
 150 static const NLType rtnl_link_info_data_ipvti_types[IFLA_VTI_MAX + 1] = {
 151         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
 152         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
 153         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
 154         [IFLA_VTI_LOCAL]        = { .type = NLA_IN_ADDR  },
 155         [IFLA_VTI_REMOTE]       = { .type = NLA_IN_ADDR  },
 156 };
 157
 158 typedef enum NLUnionLinkInfoData {
 159         NL_UNION_LINK_INFO_DATA_BOND,
 160         NL_UNION_LINK_INFO_DATA_BRIDGE,
 161         NL_UNION_LINK_INFO_DATA_VLAN,
 162         NL_UNION_LINK_INFO_DATA_VETH,
 163         NL_UNION_LINK_INFO_DATA_MACVLAN,
 164         NL_UNION_LINK_INFO_DATA_VXLAN,
 165         NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL,
 166         NL_UNION_LINK_INFO_DATA_IPGRE_TUNNEL,
 167         NL_UNION_LINK_INFO_DATA_SIT_TUNNEL,
 168         NL_UNION_LINK_INFO_DATA_VTI_TUNNEL,
 169         _NL_UNION_LINK_INFO_DATA_MAX,
 170         _NL_UNION_LINK_INFO_DATA_INVALID = -1
 171 } NLUnionLinkInfoData;
 172
 173 const char *nl_union_link_info_data_to_string(NLUnionLinkInfoData p) _const_;
 174 NLUnionLinkInfoData nl_union_link_info_data_from_string(const char *p) _pure_;
 175
 176 /* these strings must match the .kind entries in the kernel */
 177 static const char* const nl_union_link_info_data_table[_NL_UNION_LINK_INFO_DATA_MAX] = {
 178         [NL_UNION_LINK_INFO_DATA_BOND] = "bond",
 179         [NL_UNION_LINK_INFO_DATA_BRIDGE] = "bridge",
 180         [NL_UNION_LINK_INFO_DATA_VLAN] = "vlan",
 181         [NL_UNION_LINK_INFO_DATA_VETH] = "veth",
 182         [NL_UNION_LINK_INFO_DATA_MACVLAN] = "macvlan",
 183         [NL_UNION_LINK_INFO_DATA_VXLAN] = "vxlan",
 184         [NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL] = "ipip",
 185         [NL_UNION_LINK_INFO_DATA_IPGRE_TUNNEL] = "gre",
 186         [NL_UNION_LINK_INFO_DATA_SIT_TUNNEL] = "sit",
 187         [NL_UNION_LINK_INFO_DATA_VTI_TUNNEL] = "vti",
 188 };
 189
 190 DEFINE_STRING_TABLE_LOOKUP(nl_union_link_info_data, NLUnionLinkInfoData);
 191
 192 static const NLTypeSystem rtnl_link_info_data_type_systems[_NL_UNION_LINK_INFO_DATA_MAX] = {
 193         [NL_UNION_LINK_INFO_DATA_BOND] =        { .max = ELEMENTSOF(rtnl_link_info_data_bond_types) - 1,
 194                                                   .types = rtnl_link_info_data_bond_types },
 195         [NL_UNION_LINK_INFO_DATA_BRIDGE] =      { .max = ELEMENTSOF(rtnl_link_info_data_bridge_types) - 1,
 196                                                   .types = rtnl_link_info_data_bridge_types },
 197         [NL_UNION_LINK_INFO_DATA_VLAN] =        { .max = ELEMENTSOF(rtnl_link_info_data_vlan_types) - 1,
 198                                                   .types = rtnl_link_info_data_vlan_types },
 199         [NL_UNION_LINK_INFO_DATA_VETH] =        { .max = ELEMENTSOF(rtnl_link_info_data_veth_types) - 1,
 200                                                   .types = rtnl_link_info_data_veth_types },
 201         [NL_UNION_LINK_INFO_DATA_MACVLAN] =     { .max = ELEMENTSOF(rtnl_link_info_data_macvlan_types) - 1,
 202                                                   .types = rtnl_link_info_data_macvlan_types },
 203         [NL_UNION_LINK_INFO_DATA_VXLAN] =       { .max = ELEMENTSOF(rtnl_link_info_data_vxlan_types) - 1,
 204                                                   .types = rtnl_link_info_data_vxlan_types },
 205         [NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL] = { .max = ELEMENTSOF(rtnl_link_info_data_iptun_types) - 1,
 206                                                   .types = rtnl_link_info_data_iptun_types },
 207         [NL_UNION_LINK_INFO_DATA_IPGRE_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_ipgre_types) - 1,
 208                                                     .types = rtnl_link_info_data_ipgre_types },
 209         [NL_UNION_LINK_INFO_DATA_SIT_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_iptun_types) - 1,
 210                                                   .types = rtnl_link_info_data_iptun_types },
 211         [NL_UNION_LINK_INFO_DATA_VTI_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_ipvti_types) - 1,
 212                                                   .types = rtnl_link_info_data_ipvti_types },
 213 };
 214
 215 static const NLTypeSystemUnion rtnl_link_info_data_type_system_union = {
 216         .num = _NL_UNION_LINK_INFO_DATA_MAX,
 217         .lookup = nl_union_link_info_data_from_string,
 218         .type_systems = rtnl_link_info_data_type_systems,
 219         .match = IFLA_INFO_KIND,
 220 };
 221
 222 static const NLType rtnl_link_info_types[IFLA_INFO_MAX + 1] = {
 223         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
 224         [IFLA_INFO_DATA]        = { .type = NLA_UNION, .type_system_union = &rtnl_link_info_data_type_system_union},
 225 /*
 226         [IFLA_INFO_XSTATS],
 227         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
 228         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
 229 */
 230 };
 231
 232 static const NLTypeSystem rtnl_link_info_type_system = {
 233         .max = ELEMENTSOF(rtnl_link_info_types) - 1,
 234         .types = rtnl_link_info_types,
 235 };
 236
 237 static const NLType rtnl_link_types[IFLA_MAX + 1] = {
 238         [IFLA_ADDRESS]          = { .type = NLA_ETHER_ADDR, },
 239         [IFLA_BROADCAST]        = { .type = NLA_ETHER_ADDR, },
 240         [IFLA_IFNAME]           = { .type = NLA_STRING, .size = IFNAMSIZ - 1, },
 241         [IFLA_MTU]              = { .type = NLA_U32 },
 242         [IFLA_LINK]             = { .type = NLA_U32 },
 243 /*
 244         [IFLA_QDISC],
 245         [IFLA_STATS],
 246         [IFLA_COST],
 247         [IFLA_PRIORITY],
 248 */
 249         [IFLA_MASTER]           = { .type = NLA_U32 },
 250 /*
 251         [IFLA_WIRELESS],
 252         [IFLA_PROTINFO],
 253 */
 254         [IFLA_TXQLEN]           = { .type = NLA_U32 },
 255 /*
 256         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
 257 */
 258         [IFLA_WEIGHT]           = { .type = NLA_U32 },
 259         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
 260         [IFLA_LINKMODE]         = { .type = NLA_U8 },
 261         [IFLA_LINKINFO]         = { .type = NLA_NESTED, .type_system = &rtnl_link_info_type_system },
 262         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
 263         [IFLA_IFALIAS]          = { .type = NLA_STRING, .size = IFALIASZ - 1 },
 264 /*
 265         [IFLA_NUM_VF],
 266         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED, },
 267         [IFLA_STATS64],
 268         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
 269         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
 270         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
 271         [IFLA_VF_PORTS],
 272         [IFLA_PORT_SELF],
 273         [IFLA_AF_SPEC],
 274 */
 275         [IFLA_GROUP]            = { .type = NLA_U32 },
 276         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
 277         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
 278         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
 279         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
 280         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
 281         [IFLA_CARRIER]          = { .type = NLA_U8 },
 282 /*
 283         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
 284 */
 285 };
 286
 287 static const NLTypeSystem rtnl_link_type_system = {
 288         .max = ELEMENTSOF(rtnl_link_types) - 1,
 289         .types = rtnl_link_types,
 290 };
 291
 292 static const NLType rtnl_address_types[IFA_MAX + 1] = {
 293         [IFA_ADDRESS]           = { .type = NLA_IN_ADDR },
 294         [IFA_LOCAL]             = { .type = NLA_IN_ADDR },
 295         [IFA_LABEL]             = { .type = NLA_STRING, .size = IFNAMSIZ - 1 },
 296         [IFA_BROADCAST]         = { .type = NLA_IN_ADDR }, /* 6? */
 297         [IFA_CACHEINFO]         = { .type = NLA_CACHE_INFO, .size = sizeof(struct ifa_cacheinfo) },
 298 /*
 299         [IFA_ANYCAST],
 300         [IFA_MULTICAST],
 301 */
 302 #ifdef IFA_FLAGS
 303         [IFA_FLAGS]             = { .type = NLA_U32 },
 304 #endif
 305 };
 306
 307 static const NLTypeSystem rtnl_address_type_system = {
 308         .max = ELEMENTSOF(rtnl_address_types) - 1,
 309         .types = rtnl_address_types,
 310 };
 311
 312 static const NLType rtnl_route_types[RTA_MAX + 1] = {
 313         [RTA_DST]               = { .type = NLA_IN_ADDR }, /* 6? */
 314         [RTA_SRC]               = { .type = NLA_IN_ADDR }, /* 6? */
 315         [RTA_IIF]               = { .type = NLA_U32 },
 316         [RTA_OIF]               = { .type = NLA_U32 },
 317         [RTA_GATEWAY]           = { .type = NLA_IN_ADDR },
 318         [RTA_PRIORITY]          = { .type = NLA_U32 },
 319         [RTA_PREFSRC]           = { .type = NLA_IN_ADDR }, /* 6? */
 320 /*
 321         [RTA_METRICS]           = { .type = NLA_NESTED },
 322         [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
 323 */
 324         [RTA_FLOW]              = { .type = NLA_U32 }, /* 6? */
 325 /*
 326         RTA_CACHEINFO,
 327         RTA_TABLE,
 328         RTA_MARK,
 329         RTA_MFC_STATS,
 330 */
 331 };
 332
 333 static const NLTypeSystem rtnl_route_type_system = {
 334         .max = ELEMENTSOF(rtnl_route_types) - 1,
 335         .types = rtnl_route_types,
 336 };
 337
 338 static const NLType rtnl_types[RTM_MAX + 1] = {
 339         [NLMSG_ERROR]  = { .type = NLA_META, .size = sizeof(struct nlmsgerr) },
 340         [RTM_NEWLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 341         [RTM_DELLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 342         [RTM_GETLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 343         [RTM_SETLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 344         [RTM_NEWADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 345         [RTM_DELADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 346         [RTM_GETADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 347         [RTM_NEWROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 348         [RTM_DELROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 349         [RTM_GETROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 350 };
 351
 352 const NLTypeSystem rtnl_type_system = {
 353         .max = ELEMENTSOF(rtnl_types) - 1,
 354         .types = rtnl_types,
 355 };
 356
 357 int type_system_get_type(const NLTypeSystem *type_system, const NLType **ret, uint16_t type) {
 358         const NLType *nl_type;
 359
 360         assert(ret);
 361
 362         if (!type_system)
 363                 type_system = &rtnl_type_system;
 364
 365         assert(type_system->types);
 366
 367         if (type > type_system->max)
 368                 return -ENOTSUP;
 369
 370         nl_type = &type_system->types[type];
 371
 372         if (nl_type->type == NLA_UNSPEC)
 373                 return -ENOTSUP;
 374
 375         *ret = nl_type;
 376
 377         return 0;
 378 }
 379
 380 int type_system_get_type_system(const NLTypeSystem *type_system, const NLTypeSystem **ret, uint16_t type) {
 381         const NLType *nl_type;
 382         int r;
 383
 384         assert(ret);
 385
 386         r = type_system_get_type(type_system, &nl_type, type);
 387         if (r < 0)
 388                 return r;
 389
 390         assert_return(nl_type->type == NLA_NESTED, -EINVAL);
 391
 392         assert(nl_type->type_system);
 393
 394         *ret = nl_type->type_system;
 395
 396         return 0;
 397 }
 398
 399 int type_system_get_type_system_union(const NLTypeSystem *type_system, const NLTypeSystemUnion **ret, uint16_t type) {
 400         const NLType *nl_type;
 401         int r;
 402
 403         assert(ret);
 404
 405         r = type_system_get_type(type_system, &nl_type, type);
 406         if (r < 0)
 407                 return r;
 408
 409         assert_return(nl_type->type == NLA_UNION, -EINVAL);
 410
 411         assert(nl_type->type_system_union);
 412
 413         *ret = nl_type->type_system_union;
 414
 415         return 0;
 416 }
 417
 418 int type_system_union_get_type_system(const NLTypeSystemUnion *type_system_union, const NLTypeSystem **ret, const char *key) {
 419         int type;
 420
 421         assert(type_system_union);
 422         assert(type_system_union->lookup);
 423         assert(type_system_union->type_systems);
 424         assert(ret);
 425         assert(key);
 426
 427         type = type_system_union->lookup(key);
 428         if (type < 0)
 429                 return -ENOTSUP;
 430
 431         assert(type < type_system_union->num);
 432
 433         *ret = &type_system_union->type_systems[type];
 434
 435         return 0;
 436 }