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_link.h>
  35 #include <linux/if_tunnel.h>
  36
  37 #include "macro.h"
  38 #include "util.h"
  39
  40 #include "rtnl-types.h"
  41 #include "missing.h"
  42
  43 static const NLTypeSystem rtnl_link_type_system;
  44
  45 static const NLType rtnl_link_info_data_veth_types[VETH_INFO_MAX + 1] = {
  46         [VETH_INFO_PEER]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
  47 };
  48
  49 static const NLType rtnl_link_info_data_ipvlan_types[IFLA_IPVLAN_MAX + 1] = {
  50         [IFLA_IPVLAN_MODE]  = { .type = NLA_U16 },
  51 };
  52
  53 static const NLType rtnl_link_info_data_macvlan_types[IFLA_MACVLAN_MAX + 1] = {
  54         [IFLA_MACVLAN_MODE]  = { .type = NLA_U32 },
  55         [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
  56 };
  57
  58 static const NLType rtnl_link_info_data_bridge_types[IFLA_BRIDGE_MAX + 1] = {
  59         [IFLA_BRIDGE_FLAGS]     = { .type = NLA_U16 },
  60         [IFLA_BRIDGE_MODE]      = { .type = NLA_U16 },
  61 /*
  62         [IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
  63                                     .len = sizeof(struct bridge_vlan_info), },
  64 */
  65 };
  66
  67 static const NLType rtnl_link_info_data_vlan_types[IFLA_VLAN_MAX + 1] = {
  68         [IFLA_VLAN_ID]          = { .type = NLA_U16 },
  69 /*
  70         [IFLA_VLAN_FLAGS]       = { .len = sizeof(struct ifla_vlan_flags) },
  71         [IFLA_VLAN_EGRESS_QOS]  = { .type = NLA_NESTED },
  72         [IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
  73 */
  74         [IFLA_VLAN_PROTOCOL]    = { .type = NLA_U16 },
  75 };
  76
  77 static const NLType rtnl_link_info_data_vxlan_types[IFLA_VXLAN_MAX+1] = {
  78         [IFLA_VXLAN_ID] = { .type = NLA_U32 },
  79         [IFLA_VXLAN_GROUP] = {.type = NLA_IN_ADDR },
  80         [IFLA_VXLAN_LINK] = { .type = NLA_U32 },
  81         [IFLA_VXLAN_LOCAL] = { .type = NLA_U32},
  82         [IFLA_VXLAN_TTL] = { .type = NLA_U8 },
  83         [IFLA_VXLAN_TOS] = { .type = NLA_U8 },
  84         [IFLA_VXLAN_LEARNING] = { .type = NLA_U8 },
  85         [IFLA_VXLAN_AGEING] = { .type = NLA_U32 },
  86         [IFLA_VXLAN_LIMIT] = { .type = NLA_U32 },
  87         [IFLA_VXLAN_PORT_RANGE] = { .type = NLA_U32},
  88         [IFLA_VXLAN_PROXY] = { .type = NLA_U8 },
  89         [IFLA_VXLAN_RSC] = { .type = NLA_U8 },
  90         [IFLA_VXLAN_L2MISS] = { .type = NLA_U8 },
  91         [IFLA_VXLAN_L3MISS] = { .type = NLA_U8 },
  92 };
  93
  94 static const NLType rtnl_link_info_data_bond_types[IFLA_BOND_MAX + 1] = {
  95         [IFLA_BOND_MODE]                = { .type = NLA_U8 },
  96         [IFLA_BOND_ACTIVE_SLAVE]        = { .type = NLA_U32 },
  97         [IFLA_BOND_MIIMON]              = { .type = NLA_U32 },
  98         [IFLA_BOND_UPDELAY]             = { .type = NLA_U32 },
  99         [IFLA_BOND_DOWNDELAY]           = { .type = NLA_U32 },
 100         [IFLA_BOND_USE_CARRIER]         = { .type = NLA_U8 },
 101         [IFLA_BOND_ARP_INTERVAL]        = { .type = NLA_U32 },
 102         [IFLA_BOND_ARP_IP_TARGET]       = { .type = NLA_NESTED },
 103         [IFLA_BOND_ARP_VALIDATE]        = { .type = NLA_U32 },
 104         [IFLA_BOND_ARP_ALL_TARGETS]     = { .type = NLA_U32 },
 105         [IFLA_BOND_PRIMARY]             = { .type = NLA_U32 },
 106         [IFLA_BOND_PRIMARY_RESELECT]    = { .type = NLA_U8 },
 107         [IFLA_BOND_FAIL_OVER_MAC]       = { .type = NLA_U8 },
 108         [IFLA_BOND_XMIT_HASH_POLICY]    = { .type = NLA_U8 },
 109         [IFLA_BOND_RESEND_IGMP]         = { .type = NLA_U32 },
 110         [IFLA_BOND_NUM_PEER_NOTIF]      = { .type = NLA_U8 },
 111         [IFLA_BOND_ALL_SLAVES_ACTIVE]   = { .type = NLA_U8 },
 112         [IFLA_BOND_MIN_LINKS]           = { .type = NLA_U32 },
 113         [IFLA_BOND_LP_INTERVAL]         = { .type = NLA_U32 },
 114         [IFLA_BOND_PACKETS_PER_SLAVE]   = { .type = NLA_U32 },
 115         [IFLA_BOND_AD_LACP_RATE]        = { .type = NLA_U8 },
 116         [IFLA_BOND_AD_SELECT]           = { .type = NLA_U8 },
 117         [IFLA_BOND_AD_INFO]             = { .type = NLA_NESTED },
 118 };
 119
 120 static const NLType rtnl_link_info_data_iptun_types[IFLA_IPTUN_MAX + 1] = {
 121         [IFLA_IPTUN_LINK]                = { .type = NLA_U32 },
 122         [IFLA_IPTUN_LOCAL]               = { .type = NLA_IN_ADDR },
 123         [IFLA_IPTUN_REMOTE]              = { .type = NLA_IN_ADDR },
 124         [IFLA_IPTUN_TTL]                 = { .type = NLA_U8 },
 125         [IFLA_IPTUN_TOS]                 = { .type = NLA_U8 },
 126         [IFLA_IPTUN_PMTUDISC]            = { .type = NLA_U8 },
 127         [IFLA_IPTUN_FLAGS]               = { .type = NLA_U16 },
 128         [IFLA_IPTUN_PROTO]               = { .type = NLA_U8 },
 129         [IFLA_IPTUN_6RD_PREFIX]          = { .type = NLA_IN_ADDR },
 130         [IFLA_IPTUN_6RD_RELAY_PREFIX]    = { .type = NLA_U32 },
 131         [IFLA_IPTUN_6RD_PREFIXLEN]       = { .type = NLA_U16 },
 132         [IFLA_IPTUN_6RD_RELAY_PREFIXLEN] = { .type = NLA_U16 },
 133 };
 134
 135 static  const NLType rtnl_link_info_data_ipgre_types[IFLA_GRE_MAX + 1] = {
 136         [IFLA_GRE_LINK]     = { .type = NLA_U32 },
 137         [IFLA_GRE_IFLAGS]   = { .type = NLA_U16 },
 138         [IFLA_GRE_OFLAGS]   = { .type = NLA_U16 },
 139         [IFLA_GRE_IKEY]     = { .type = NLA_U32 },
 140         [IFLA_GRE_OKEY]     = { .type = NLA_U32 },
 141         [IFLA_GRE_LOCAL]    = { .type = NLA_IN_ADDR },
 142         [IFLA_GRE_REMOTE]   = { .type = NLA_IN_ADDR },
 143         [IFLA_GRE_TTL]      = { .type = NLA_U8 },
 144         [IFLA_GRE_TOS]      = { .type = NLA_U8 },
 145         [IFLA_GRE_PMTUDISC] = { .type = NLA_U8 },
 146 };
 147
 148 static const NLType rtnl_link_info_data_ipvti_types[IFLA_VTI_MAX + 1] = {
 149         [IFLA_VTI_LINK]         = { .type = NLA_U32 },
 150         [IFLA_VTI_IKEY]         = { .type = NLA_U32 },
 151         [IFLA_VTI_OKEY]         = { .type = NLA_U32 },
 152         [IFLA_VTI_LOCAL]        = { .type = NLA_IN_ADDR  },
 153         [IFLA_VTI_REMOTE]       = { .type = NLA_IN_ADDR  },
 154 };
 155
 156 /* these strings must match the .kind entries in the kernel */
 157 static const char* const nl_union_link_info_data_table[_NL_UNION_LINK_INFO_DATA_MAX] = {
 158         [NL_UNION_LINK_INFO_DATA_BOND] = "bond",
 159         [NL_UNION_LINK_INFO_DATA_BRIDGE] = "bridge",
 160         [NL_UNION_LINK_INFO_DATA_VLAN] = "vlan",
 161         [NL_UNION_LINK_INFO_DATA_VETH] = "veth",
 162         [NL_UNION_LINK_INFO_DATA_DUMMY] = "dummy",
 163         [NL_UNION_LINK_INFO_DATA_MACVLAN] = "macvlan",
 164         [NL_UNION_LINK_INFO_DATA_IPVLAN] = "ipvlan",
 165         [NL_UNION_LINK_INFO_DATA_VXLAN] = "vxlan",
 166         [NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL] = "ipip",
 167         [NL_UNION_LINK_INFO_DATA_IPGRE_TUNNEL] = "gre",
 168         [NL_UNION_LINK_INFO_DATA_SIT_TUNNEL] = "sit",
 169         [NL_UNION_LINK_INFO_DATA_VTI_TUNNEL] = "vti",
 170 };
 171
 172 DEFINE_STRING_TABLE_LOOKUP(nl_union_link_info_data, NLUnionLinkInfoData);
 173
 174 static const NLTypeSystem rtnl_link_info_data_type_systems[_NL_UNION_LINK_INFO_DATA_MAX] = {
 175         [NL_UNION_LINK_INFO_DATA_BOND] =        { .max = ELEMENTSOF(rtnl_link_info_data_bond_types) - 1,
 176                                                   .types = rtnl_link_info_data_bond_types },
 177         [NL_UNION_LINK_INFO_DATA_BRIDGE] =      { .max = ELEMENTSOF(rtnl_link_info_data_bridge_types) - 1,
 178                                                   .types = rtnl_link_info_data_bridge_types },
 179         [NL_UNION_LINK_INFO_DATA_VLAN] =        { .max = ELEMENTSOF(rtnl_link_info_data_vlan_types) - 1,
 180                                                   .types = rtnl_link_info_data_vlan_types },
 181         [NL_UNION_LINK_INFO_DATA_VETH] =        { .max = ELEMENTSOF(rtnl_link_info_data_veth_types) - 1,
 182                                                   .types = rtnl_link_info_data_veth_types },
 183         [NL_UNION_LINK_INFO_DATA_MACVLAN] =     { .max = ELEMENTSOF(rtnl_link_info_data_macvlan_types) - 1,
 184                                                   .types = rtnl_link_info_data_macvlan_types },
 185         [NL_UNION_LINK_INFO_DATA_IPVLAN] =      { .max = ELEMENTSOF(rtnl_link_info_data_ipvlan_types) - 1,
 186                                                   .types = rtnl_link_info_data_ipvlan_types },
 187         [NL_UNION_LINK_INFO_DATA_VXLAN] =       { .max = ELEMENTSOF(rtnl_link_info_data_vxlan_types) - 1,
 188                                                   .types = rtnl_link_info_data_vxlan_types },
 189         [NL_UNION_LINK_INFO_DATA_IPIP_TUNNEL] = { .max = ELEMENTSOF(rtnl_link_info_data_iptun_types) - 1,
 190                                                   .types = rtnl_link_info_data_iptun_types },
 191         [NL_UNION_LINK_INFO_DATA_IPGRE_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_ipgre_types) - 1,
 192                                                     .types = rtnl_link_info_data_ipgre_types },
 193         [NL_UNION_LINK_INFO_DATA_SIT_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_iptun_types) - 1,
 194                                                   .types = rtnl_link_info_data_iptun_types },
 195         [NL_UNION_LINK_INFO_DATA_VTI_TUNNEL] =  { .max = ELEMENTSOF(rtnl_link_info_data_ipvti_types) - 1,
 196                                                   .types = rtnl_link_info_data_ipvti_types },
 197 };
 198
 199 static const NLTypeSystemUnion rtnl_link_info_data_type_system_union = {
 200         .num = _NL_UNION_LINK_INFO_DATA_MAX,
 201         .lookup = nl_union_link_info_data_from_string,
 202         .type_systems = rtnl_link_info_data_type_systems,
 203         .match = IFLA_INFO_KIND,
 204 };
 205
 206 static const NLType rtnl_link_info_types[IFLA_INFO_MAX + 1] = {
 207         [IFLA_INFO_KIND]        = { .type = NLA_STRING },
 208         [IFLA_INFO_DATA]        = { .type = NLA_UNION, .type_system_union = &rtnl_link_info_data_type_system_union},
 209 /*
 210         [IFLA_INFO_XSTATS],
 211         [IFLA_INFO_SLAVE_KIND]  = { .type = NLA_STRING },
 212         [IFLA_INFO_SLAVE_DATA]  = { .type = NLA_NESTED },
 213 */
 214 };
 215
 216 static const NLTypeSystem rtnl_link_info_type_system = {
 217         .max = ELEMENTSOF(rtnl_link_info_types) - 1,
 218         .types = rtnl_link_info_types,
 219 };
 220
 221 static const struct NLType rtnl_bridge_port_types[IFLA_BRPORT_MAX + 1] = {
 222         [IFLA_BRPORT_STATE]     = { .type = NLA_U8 },
 223         [IFLA_BRPORT_COST]      = { .type = NLA_U32 },
 224         [IFLA_BRPORT_PRIORITY]  = { .type = NLA_U16 },
 225         [IFLA_BRPORT_MODE]      = { .type = NLA_U8 },
 226         [IFLA_BRPORT_GUARD]     = { .type = NLA_U8 },
 227         [IFLA_BRPORT_PROTECT]   = { .type = NLA_U8 },
 228         [IFLA_BRPORT_LEARNING]  = { .type = NLA_U8 },
 229         [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
 230 };
 231
 232 static const NLTypeSystem rtnl_bridge_port_type_system = {
 233         .max = ELEMENTSOF(rtnl_bridge_port_types) - 1,
 234         .types = rtnl_bridge_port_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_PROTINFO]         = { .type = NLA_NESTED, .type_system = &rtnl_bridge_port_type_system },
 255         [IFLA_TXQLEN]           = { .type = NLA_U32 },
 256 /*
 257         [IFLA_MAP]              = { .len = sizeof(struct rtnl_link_ifmap) },
 258 */
 259         [IFLA_WEIGHT]           = { .type = NLA_U32 },
 260         [IFLA_OPERSTATE]        = { .type = NLA_U8 },
 261         [IFLA_LINKMODE]         = { .type = NLA_U8 },
 262         [IFLA_LINKINFO]         = { .type = NLA_NESTED, .type_system = &rtnl_link_info_type_system },
 263         [IFLA_NET_NS_PID]       = { .type = NLA_U32 },
 264         [IFLA_IFALIAS]          = { .type = NLA_STRING, .size = IFALIASZ - 1 },
 265 /*
 266         [IFLA_NUM_VF],
 267         [IFLA_VFINFO_LIST]      = {. type = NLA_NESTED, },
 268         [IFLA_STATS64],
 269         [IFLA_VF_PORTS]         = { .type = NLA_NESTED },
 270         [IFLA_PORT_SELF]        = { .type = NLA_NESTED },
 271         [IFLA_AF_SPEC]          = { .type = NLA_NESTED },
 272         [IFLA_VF_PORTS],
 273         [IFLA_PORT_SELF],
 274         [IFLA_AF_SPEC],
 275 */
 276         [IFLA_GROUP]            = { .type = NLA_U32 },
 277         [IFLA_NET_NS_FD]        = { .type = NLA_U32 },
 278         [IFLA_EXT_MASK]         = { .type = NLA_U32 },
 279         [IFLA_PROMISCUITY]      = { .type = NLA_U32 },
 280         [IFLA_NUM_TX_QUEUES]    = { .type = NLA_U32 },
 281         [IFLA_NUM_RX_QUEUES]    = { .type = NLA_U32 },
 282         [IFLA_CARRIER]          = { .type = NLA_U8 },
 283 /*
 284         [IFLA_PHYS_PORT_ID]     = { .type = NLA_BINARY, .len = MAX_PHYS_PORT_ID_LEN },
 285 */
 286 };
 287
 288 static const NLTypeSystem rtnl_link_type_system = {
 289         .max = ELEMENTSOF(rtnl_link_types) - 1,
 290         .types = rtnl_link_types,
 291 };
 292
 293 static const NLType rtnl_address_types[IFA_MAX + 1] = {
 294         [IFA_ADDRESS]           = { .type = NLA_IN_ADDR },
 295         [IFA_LOCAL]             = { .type = NLA_IN_ADDR },
 296         [IFA_LABEL]             = { .type = NLA_STRING, .size = IFNAMSIZ - 1 },
 297         [IFA_BROADCAST]         = { .type = NLA_IN_ADDR }, /* 6? */
 298         [IFA_CACHEINFO]         = { .type = NLA_CACHE_INFO, .size = sizeof(struct ifa_cacheinfo) },
 299 /*
 300         [IFA_ANYCAST],
 301         [IFA_MULTICAST],
 302 */
 303 #ifdef IFA_FLAGS
 304         [IFA_FLAGS]             = { .type = NLA_U32 },
 305 #endif
 306 };
 307
 308 static const NLTypeSystem rtnl_address_type_system = {
 309         .max = ELEMENTSOF(rtnl_address_types) - 1,
 310         .types = rtnl_address_types,
 311 };
 312
 313 static const NLType rtnl_route_types[RTA_MAX + 1] = {
 314         [RTA_DST]               = { .type = NLA_IN_ADDR }, /* 6? */
 315         [RTA_SRC]               = { .type = NLA_IN_ADDR }, /* 6? */
 316         [RTA_IIF]               = { .type = NLA_U32 },
 317         [RTA_OIF]               = { .type = NLA_U32 },
 318         [RTA_GATEWAY]           = { .type = NLA_IN_ADDR },
 319         [RTA_PRIORITY]          = { .type = NLA_U32 },
 320         [RTA_PREFSRC]           = { .type = NLA_IN_ADDR }, /* 6? */
 321 /*
 322         [RTA_METRICS]           = { .type = NLA_NESTED },
 323         [RTA_MULTIPATH]         = { .len = sizeof(struct rtnexthop) },
 324 */
 325         [RTA_FLOW]              = { .type = NLA_U32 }, /* 6? */
 326 /*
 327         RTA_CACHEINFO,
 328         RTA_TABLE,
 329         RTA_MARK,
 330         RTA_MFC_STATS,
 331 */
 332 };
 333
 334 static const NLTypeSystem rtnl_route_type_system = {
 335         .max = ELEMENTSOF(rtnl_route_types) - 1,
 336         .types = rtnl_route_types,
 337 };
 338
 339 static const NLType rtnl_neigh_types[NDA_MAX + 1] = {
 340         [NDA_DST]               = { .type = NLA_IN_ADDR },
 341         [NDA_LLADDR]            = { .type = NLA_ETHER_ADDR },
 342         [NDA_CACHEINFO]         = { .type = NLA_CACHE_INFO, .size = sizeof(struct nda_cacheinfo) },
 343         [NDA_PROBES]            = { .type = NLA_U32 },
 344         [NDA_VLAN]              = { .type = NLA_U16 },
 345         [NDA_PORT]              = { .type = NLA_U16 },
 346         [NDA_VNI]               = { .type = NLA_U32 },
 347         [NDA_IFINDEX]           = { .type = NLA_U32 },
 348 };
 349
 350 static const NLTypeSystem rtnl_neigh_type_system = {
 351         .max = ELEMENTSOF(rtnl_neigh_types) - 1,
 352         .types = rtnl_neigh_types,
 353 };
 354
 355 static const NLType rtnl_types[RTM_MAX + 1] = {
 356         [NLMSG_ERROR]  = { .type = NLA_META, .size = sizeof(struct nlmsgerr) },
 357         [RTM_NEWLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 358         [RTM_DELLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 359         [RTM_GETLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 360         [RTM_SETLINK]  = { .type = NLA_NESTED, .type_system = &rtnl_link_type_system, .size = sizeof(struct ifinfomsg) },
 361         [RTM_NEWADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 362         [RTM_DELADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 363         [RTM_GETADDR]  = { .type = NLA_NESTED, .type_system = &rtnl_address_type_system, .size = sizeof(struct ifaddrmsg) },
 364         [RTM_NEWROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 365         [RTM_DELROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 366         [RTM_GETROUTE] = { .type = NLA_NESTED, .type_system = &rtnl_route_type_system, .size = sizeof(struct rtmsg) },
 367         [RTM_NEWNEIGH] = { .type = NLA_NESTED, .type_system = &rtnl_neigh_type_system, .size = sizeof(struct ndmsg) },
 368         [RTM_DELNEIGH] = { .type = NLA_NESTED, .type_system = &rtnl_neigh_type_system, .size = sizeof(struct ndmsg) },
 369         [RTM_GETNEIGH] = { .type = NLA_NESTED, .type_system = &rtnl_neigh_type_system, .size = sizeof(struct ndmsg) },
 370 };
 371
 372 const NLTypeSystem rtnl_type_system = {
 373         .max = ELEMENTSOF(rtnl_types) - 1,
 374         .types = rtnl_types,
 375 };
 376
 377 int type_system_get_type(const NLTypeSystem *type_system, const NLType **ret, uint16_t type) {
 378         const NLType *nl_type;
 379
 380         assert(ret);
 381
 382         if (!type_system)
 383                 type_system = &rtnl_type_system;
 384
 385         assert(type_system->types);
 386
 387         if (type > type_system->max)
 388                 return -ENOTSUP;
 389
 390         nl_type = &type_system->types[type];
 391
 392         if (nl_type->type == NLA_UNSPEC)
 393                 return -ENOTSUP;
 394
 395         *ret = nl_type;
 396
 397         return 0;
 398 }
 399
 400 int type_system_get_type_system(const NLTypeSystem *type_system, const NLTypeSystem **ret, uint16_t type) {
 401         const NLType *nl_type;
 402         int r;
 403
 404         assert(ret);
 405
 406         r = type_system_get_type(type_system, &nl_type, type);
 407         if (r < 0)
 408                 return r;
 409
 410         assert_return(nl_type->type == NLA_NESTED, -EINVAL);
 411
 412         assert(nl_type->type_system);
 413
 414         *ret = nl_type->type_system;
 415
 416         return 0;
 417 }
 418
 419 int type_system_get_type_system_union(const NLTypeSystem *type_system, const NLTypeSystemUnion **ret, uint16_t type) {
 420         const NLType *nl_type;
 421         int r;
 422
 423         assert(ret);
 424
 425         r = type_system_get_type(type_system, &nl_type, type);
 426         if (r < 0)
 427                 return r;
 428
 429         assert_return(nl_type->type == NLA_UNION, -EINVAL);
 430
 431         assert(nl_type->type_system_union);
 432
 433         *ret = nl_type->type_system_union;
 434
 435         return 0;
 436 }
 437
 438 int type_system_union_get_type_system(const NLTypeSystemUnion *type_system_union, const NLTypeSystem **ret, const char *key) {
 439         int type;
 440
 441         assert(type_system_union);
 442         assert(type_system_union->lookup);
 443         assert(type_system_union->type_systems);
 444         assert(ret);
 445         assert(key);
 446
 447         type = type_system_union->lookup(key);
 448         if (type < 0)
 449                 return -ENOTSUP;
 450
 451         assert(type < type_system_union->num);
 452
 453         *ret = &type_system_union->type_systems[type];
 454
 455         return 0;
 456 }