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_DUMMY,
 164         NL_UNION_LINK_INFO_DATA_MACVLAN,
 165         NL_UNION_LINK_INFO_DATA_VXLAN,
 166         NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL,
 167         NL_UNION_LINK_INFO_DATA_IPGRE_TUNNEL,
 168         NL_UNION_LINK_INFO_DATA_SIT_TUNNEL,
 169         NL_UNION_LINK_INFO_DATA_VTI_TUNNEL,
 170         _NL_UNION_LINK_INFO_DATA_MAX,
 171         _NL_UNION_LINK_INFO_DATA_INVALID = -1
 172 } NLUnionLinkInfoData;
 173
 174 const char *nl_union_link_info_data_to_string(NLUnionLinkInfoData p) _const_;
 175 NLUnionLinkInfoData nl_union_link_info_data_from_string(const char *p) _pure_;
 176
 177 /* these strings must match the .kind entries in the kernel */
 178 static const char* const nl_union_link_info_data_table[_NL_UNION_LINK_INFO_DATA_MAX] = {
 179         [NL_UNION_LINK_INFO_DATA_BOND] = "bond",
 180         [NL_UNION_LINK_INFO_DATA_BRIDGE] = "bridge",
 181         [NL_UNION_LINK_INFO_DATA_VLAN] = "vlan",
 182         [NL_UNION_LINK_INFO_DATA_VETH] = "veth",
 183         [NL_UNION_LINK_INFO_DATA_DUMMY] = "dummy",
 184         [NL_UNION_LINK_INFO_DATA_MACVLAN] = "macvlan",
 185         [NL_UNION_LINK_INFO_DATA_VXLAN] = "vxlan",
 186         [NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL] = "ipip",
 187         [NL_UNION_LINK_INFO_DATA_IPGRE_TUNNEL] = "gre",
 188         [NL_UNION_LINK_INFO_DATA_SIT_TUNNEL] = "sit",
 189         [NL_UNION_LINK_INFO_DATA_VTI_TUNNEL] = "vti",
 190 };
 191
 192 DEFINE_STRING_TABLE_LOOKUP(nl_union_link_info_data, NLUnionLinkInfoData);
 193
 194 static const NLTypeSystem rtnl_link_info_data_type_systems[_NL_UNION_LINK_INFO_DATA_MAX] = {
 195         [NL_UNION_LINK_INFO_DATA_BOND] =        { .max = ELEMENTSOF(rtnl_link_info_data_bond_types) - 1,
 196                                                   .types = rtnl_link_info_data_bond_types },
 197         [NL_UNION_LINK_INFO_DATA_BRIDGE] =      { .max = ELEMENTSOF(rtnl_link_info_data_bridge_types) - 1,
 198                                                   .types = rtnl_link_info_data_bridge_types },
 199         [NL_UNION_LINK_INFO_DATA_VLAN] =        { .max = ELEMENTSOF(rtnl_link_info_data_vlan_types) - 1,
 200                                                   .types = rtnl_link_info_data_vlan_types },
 201         [NL_UNION_LINK_INFO_DATA_VETH] =        { .max = ELEMENTSOF(rtnl_link_info_data_veth_types) - 1,
 202                                                   .types = rtnl_link_info_data_veth_types },
 203         [NL_UNION_LINK_INFO_DATA_MACVLAN] =     { .max = ELEMENTSOF(rtnl_link_info_data_macvlan_types) - 1,
 204                                                   .types = rtnl_link_info_data_macvlan_types },
 205         [NL_UNION_LINK_INFO_DATA_VXLAN] =       { .max = ELEMENTSOF(rtnl_link_info_data_vxlan_types) - 1,
 206                                                   .types = rtnl_link_info_data_vxlan_types },
 207         [NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL] = { .max = ELEMENTSOF(rtnl_link_info_data_iptun_types) - 1,
 208                                                   .types = rtnl_link_info_data_iptun_types },
 209         [NL_UNION_LINK_INFO_DATA_IPGRE_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_ipgre_types) - 1,
 210                                                     .types = rtnl_link_info_data_ipgre_types },
 211         [NL_UNION_LINK_INFO_DATA_SIT_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_iptun_types) - 1,
 212                                                   .types = rtnl_link_info_data_iptun_types },
 213         [NL_UNION_LINK_INFO_DATA_VTI_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_ipvti_types) - 1,
 214                                                   .types = rtnl_link_info_data_ipvti_types },
 215 };
 216
 217 static const NLTypeSystemUnion rtnl_link_info_data_type_system_union = {
 218         .num = _NL_UNION_LINK_INFO_DATA_MAX,
 219         .lookup = nl_union_link_info_data_from_string,
 220         .type_systems = rtnl_link_info_data_type_systems,
 221         .match = IFLA_INFO_KIND,
 222 };
 223
 224 static const NLType rtnl_link_info_types[IFLA_INFO_MAX + 1] = {
 225         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
 226         [IFLA_INFO_DATA]        = { .type = NLA_UNION, .type_system_union = &rtnl_link_info_data_type_system_union},
 227 /*
 228         [IFLA_INFO_XSTATS],
 229         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
 230         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
 231 */
 232 };
 233
 234 static const NLTypeSystem rtnl_link_info_type_system = {
 235         .max = ELEMENTSOF(rtnl_link_info_types) - 1,
 236         .types = rtnl_link_info_types,
 237 };
 238
 239 static const NLType rtnl_link_types[IFLA_MAX + 1] = {
 240         [IFLA_ADDRESS]          = { .type = NLA_ETHER_ADDR, },
 241         [IFLA_BROADCAST]        = { .type = NLA_ETHER_ADDR, },
 242         [IFLA_IFNAME]           = { .type = NLA_STRING, .size = IFNAMSIZ - 1, },
 243         [IFLA_MTU]              = { .type = NLA_U32 },
 244         [IFLA_LINK]             = { .type = NLA_U32 },
 245 /*
 246         [IFLA_QDISC],
 247         [IFLA_STATS],
 248         [IFLA_COST],
 249         [IFLA_PRIORITY],
 250 */
 251         [IFLA_MASTER]           = { .type = NLA_U32 },
 252 /*
 253         [IFLA_WIRELESS],
 254         [IFLA_PROTINFO],
 255 */
 256         [IFLA_TXQLEN]           = { .type = NLA_U32 },
 257 /*
 258         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
 259 */
 260         [IFLA_WEIGHT]           = { .type = NLA_U32 },
 261         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
 262         [IFLA_LINKMODE]         = { .type = NLA_U8 },
 263         [IFLA_LINKINFO]         = { .type = NLA_NESTED, .type_system = &rtnl_link_info_type_system },
 264         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
 265         [IFLA_IFALIAS]          = { .type = NLA_STRING, .size = IFALIASZ - 1 },
 266 /*
 267         [IFLA_NUM_VF],
 268         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED, },
 269         [IFLA_STATS64],
 270         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
 271         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
 272         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
 273         [IFLA_VF_PORTS],
 274         [IFLA_PORT_SELF],
 275         [IFLA_AF_SPEC],
 276 */
 277         [IFLA_GROUP]            = { .type = NLA_U32 },
 278         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
 279         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
 280         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
 281         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
 282         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
 283         [IFLA_CARRIER]          = { .type = NLA_U8 },
 284 /*
 285         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
 286 */
 287 };
 288
 289 static const NLTypeSystem rtnl_link_type_system = {
 290         .max = ELEMENTSOF(rtnl_link_types) - 1,
 291         .types = rtnl_link_types,
 292 };
 293
 294 static const NLType rtnl_address_types[IFA_MAX + 1] = {
 295         [IFA_ADDRESS]           = { .type = NLA_IN_ADDR },
 296         [IFA_LOCAL]             = { .type = NLA_IN_ADDR },
 297         [IFA_LABEL]             = { .type = NLA_STRING, .size = IFNAMSIZ - 1 },
 298         [IFA_BROADCAST]         = { .type = NLA_IN_ADDR }, /* 6? */
 299         [IFA_CACHEINFO]         = { .type = NLA_CACHE_INFO, .size = sizeof(struct ifa_cacheinfo) },
 300 /*
 301         [IFA_ANYCAST],
 302         [IFA_MULTICAST],
 303 */
 304 #ifdef IFA_FLAGS
 305         [IFA_FLAGS]             = { .type = NLA_U32 },
 306 #endif
 307 };
 308
 309 static const NLTypeSystem rtnl_address_type_system = {
 310         .max = ELEMENTSOF(rtnl_address_types) - 1,
 311         .types = rtnl_address_types,
 312 };
 313
 314 static const NLType rtnl_route_types[RTA_MAX + 1] = {
 315         [RTA_DST]               = { .type = NLA_IN_ADDR }, /* 6? */
 316         [RTA_SRC]               = { .type = NLA_IN_ADDR }, /* 6? */
 317         [RTA_IIF]               = { .type = NLA_U32 },
 318         [RTA_OIF]               = { .type = NLA_U32 },
 319         [RTA_GATEWAY]           = { .type = NLA_IN_ADDR },
 320         [RTA_PRIORITY]          = { .type = NLA_U32 },
 321         [RTA_PREFSRC]           = { .type = NLA_IN_ADDR }, /* 6? */
 322 /*
 323         [RTA_METRICS]           = { .type = NLA_NESTED },
 324         [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
 325 */
 326         [RTA_FLOW]              = { .type = NLA_U32 }, /* 6? */
 327 /*
 328         RTA_CACHEINFO,
 329         RTA_TABLE,
 330         RTA_MARK,
 331         RTA_MFC_STATS,
 332 */
 333 };
 334
 335 static const NLTypeSystem rtnl_route_type_system = {
 336         .max = ELEMENTSOF(rtnl_route_types) - 1,
 337         .types = rtnl_route_types,
 338 };
 339
 340 static const NLType rtnl_types[RTM_MAX + 1] = {
 341         [NLMSG_ERROR]  = { .type = NLA_META, .size = sizeof(struct nlmsgerr) },
 342         [RTM_NEWLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 343         [RTM_DELLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 344         [RTM_GETLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 345         [RTM_SETLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 346         [RTM_NEWADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 347         [RTM_DELADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 348         [RTM_GETADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 349         [RTM_NEWROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 350         [RTM_DELROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 351         [RTM_GETROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 352 };
 353
 354 const NLTypeSystem rtnl_type_system = {
 355         .max = ELEMENTSOF(rtnl_types) - 1,
 356         .types = rtnl_types,
 357 };
 358
 359 int type_system_get_type(const NLTypeSystem *type_system, const NLType **ret, uint16_t type) {
 360         const NLType *nl_type;
 361
 362         assert(ret);
 363
 364         if (!type_system)
 365                 type_system = &rtnl_type_system;
 366
 367         assert(type_system->types);
 368
 369         if (type > type_system->max)
 370                 return -ENOTSUP;
 371
 372         nl_type = &type_system->types[type];
 373
 374         if (nl_type->type == NLA_UNSPEC)
 375                 return -ENOTSUP;
 376
 377         *ret = nl_type;
 378
 379         return 0;
 380 }
 381
 382 int type_system_get_type_system(const NLTypeSystem *type_system, const NLTypeSystem **ret, uint16_t type) {
 383         const NLType *nl_type;
 384         int r;
 385
 386         assert(ret);
 387
 388         r = type_system_get_type(type_system, &nl_type, type);
 389         if (r < 0)
 390                 return r;
 391
 392         assert_return(nl_type->type == NLA_NESTED, -EINVAL);
 393
 394         assert(nl_type->type_system);
 395
 396         *ret = nl_type->type_system;
 397
 398         return 0;
 399 }
 400
 401 int type_system_get_type_system_union(const NLTypeSystem *type_system, const NLTypeSystemUnion **ret, uint16_t type) {
 402         const NLType *nl_type;
 403         int r;
 404
 405         assert(ret);
 406
 407         r = type_system_get_type(type_system, &nl_type, type);
 408         if (r < 0)
 409                 return r;
 410
 411         assert_return(nl_type->type == NLA_UNION, -EINVAL);
 412
 413         assert(nl_type->type_system_union);
 414
 415         *ret = nl_type->type_system_union;
 416
 417         return 0;
 418 }
 419
 420 int type_system_union_get_type_system(const NLTypeSystemUnion *type_system_union, const NLTypeSystem **ret, const char *key) {
 421         int type;
 422
 423         assert(type_system_union);
 424         assert(type_system_union->lookup);
 425         assert(type_system_union->type_systems);
 426         assert(ret);
 427         assert(key);
 428
 429         type = type_system_union->lookup(key);
 430         if (type < 0)
 431                 return -ENOTSUP;
 432
 433         assert(type < type_system_union->num);
 434
 435         *ret = &type_system_union->type_systems[type];
 436
 437         return 0;
 438 }