net/tipc/netlink.c

   1 /*
   2  * net/tipc/netlink.c: TIPC configuration handling
   3  *
   4  * Copyright (c) 2005-2006, 2014, Ericsson AB
   5  * Copyright (c) 2005-2007, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #include "core.h"
  38 #include "socket.h"
  39 #include "name_table.h"
  40 #include "bearer.h"
  41 #include "link.h"
  42 #include "node.h"
  43 #include "net.h"
  44 #include "udp_media.h"
  45 #include <net/genetlink.h>
  46
  47 static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
  48         [TIPC_NLA_UNSPEC]       = { .type = NLA_UNSPEC, },
  49         [TIPC_NLA_BEARER]       = { .type = NLA_NESTED, },
  50         [TIPC_NLA_SOCK]         = { .type = NLA_NESTED, },
  51         [TIPC_NLA_PUBL]         = { .type = NLA_NESTED, },
  52         [TIPC_NLA_LINK]         = { .type = NLA_NESTED, },
  53         [TIPC_NLA_MEDIA]        = { .type = NLA_NESTED, },
  54         [TIPC_NLA_NODE]         = { .type = NLA_NESTED, },
  55         [TIPC_NLA_NET]          = { .type = NLA_NESTED, },
  56         [TIPC_NLA_NAME_TABLE]   = { .type = NLA_NESTED, },
  57         [TIPC_NLA_MON]          = { .type = NLA_NESTED, },
  58 };
  59
  60 const struct nla_policy
  61 tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
  62         [TIPC_NLA_NAME_TABLE_UNSPEC]    = { .type = NLA_UNSPEC },
  63         [TIPC_NLA_NAME_TABLE_PUBL]      = { .type = NLA_NESTED }
  64 };
  65
  66 const struct nla_policy tipc_nl_monitor_policy[TIPC_NLA_MON_MAX + 1] = {
  67         [TIPC_NLA_MON_UNSPEC]                   = { .type = NLA_UNSPEC },
  68         [TIPC_NLA_MON_REF]                      = { .type = NLA_U32 },
  69         [TIPC_NLA_MON_ACTIVATION_THRESHOLD]     = { .type = NLA_U32 },
  70 };
  71
  72 const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
  73         [TIPC_NLA_SOCK_UNSPEC]          = { .type = NLA_UNSPEC },
  74         [TIPC_NLA_SOCK_ADDR]            = { .type = NLA_U32 },
  75         [TIPC_NLA_SOCK_REF]             = { .type = NLA_U32 },
  76         [TIPC_NLA_SOCK_CON]             = { .type = NLA_NESTED },
  77         [TIPC_NLA_SOCK_HAS_PUBL]        = { .type = NLA_FLAG }
  78 };
  79
  80 const struct nla_policy tipc_nl_net_policy[TIPC_NLA_NET_MAX + 1] = {
  81         [TIPC_NLA_NET_UNSPEC]           = { .type = NLA_UNSPEC },
  82         [TIPC_NLA_NET_ID]               = { .type = NLA_U32 },
  83         [TIPC_NLA_NET_ADDR]             = { .type = NLA_U32 },
  84 };
  85
  86 const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
  87         [TIPC_NLA_LINK_UNSPEC]          = { .type = NLA_UNSPEC },
  88         [TIPC_NLA_LINK_NAME]            = { .type = NLA_STRING,
  89                                             .len = TIPC_MAX_LINK_NAME },
  90         [TIPC_NLA_LINK_MTU]             = { .type = NLA_U32 },
  91         [TIPC_NLA_LINK_BROADCAST]       = { .type = NLA_FLAG },
  92         [TIPC_NLA_LINK_UP]              = { .type = NLA_FLAG },
  93         [TIPC_NLA_LINK_ACTIVE]          = { .type = NLA_FLAG },
  94         [TIPC_NLA_LINK_PROP]            = { .type = NLA_NESTED },
  95         [TIPC_NLA_LINK_STATS]           = { .type = NLA_NESTED },
  96         [TIPC_NLA_LINK_RX]              = { .type = NLA_U32 },
  97         [TIPC_NLA_LINK_TX]              = { .type = NLA_U32 }
  98 };
  99
 100 const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
 101         [TIPC_NLA_NODE_UNSPEC]          = { .type = NLA_UNSPEC },
 102         [TIPC_NLA_NODE_ADDR]            = { .type = NLA_U32 },
 103         [TIPC_NLA_NODE_UP]              = { .type = NLA_FLAG }
 104 };
 105
 106 /* Properties valid for media, bearer and link */
 107 const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
 108         [TIPC_NLA_PROP_UNSPEC]          = { .type = NLA_UNSPEC },
 109         [TIPC_NLA_PROP_PRIO]            = { .type = NLA_U32 },
 110         [TIPC_NLA_PROP_TOL]             = { .type = NLA_U32 },
 111         [TIPC_NLA_PROP_WIN]             = { .type = NLA_U32 }
 112 };
 113
 114 const struct nla_policy tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]  = {
 115         [TIPC_NLA_BEARER_UNSPEC]        = { .type = NLA_UNSPEC },
 116         [TIPC_NLA_BEARER_NAME]          = { .type = NLA_STRING,
 117                                             .len = TIPC_MAX_BEARER_NAME },
 118         [TIPC_NLA_BEARER_PROP]          = { .type = NLA_NESTED },
 119         [TIPC_NLA_BEARER_DOMAIN]        = { .type = NLA_U32 }
 120 };
 121
 122 const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
 123         [TIPC_NLA_MEDIA_UNSPEC]         = { .type = NLA_UNSPEC },
 124         [TIPC_NLA_MEDIA_NAME]           = { .type = NLA_STRING },
 125         [TIPC_NLA_MEDIA_PROP]           = { .type = NLA_NESTED }
 126 };
 127
 128 const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
 129         [TIPC_NLA_UDP_UNSPEC]   = {.type = NLA_UNSPEC},
 130         [TIPC_NLA_UDP_LOCAL]    = {.type = NLA_BINARY,
 131                                    .len = sizeof(struct sockaddr_storage)},
 132         [TIPC_NLA_UDP_REMOTE]   = {.type = NLA_BINARY,
 133                                    .len = sizeof(struct sockaddr_storage)},
 134 };
 135
 136 /* Users of the legacy API (tipc-config) can't handle that we add operations,
 137  * so we have a separate genl handling for the new API.
 138  */
 139 static const struct genl_ops tipc_genl_v2_ops[] = {
 140         {
 141                 .cmd    = TIPC_NL_BEARER_DISABLE,
 142                 .doit   = tipc_nl_bearer_disable,
 143                 .policy = tipc_nl_policy,
 144         },
 145         {
 146                 .cmd    = TIPC_NL_BEARER_ENABLE,
 147                 .doit   = tipc_nl_bearer_enable,
 148                 .policy = tipc_nl_policy,
 149         },
 150         {
 151                 .cmd    = TIPC_NL_BEARER_GET,
 152                 .doit   = tipc_nl_bearer_get,
 153                 .dumpit = tipc_nl_bearer_dump,
 154                 .policy = tipc_nl_policy,
 155         },
 156         {
 157                 .cmd    = TIPC_NL_BEARER_ADD,
 158                 .doit   = tipc_nl_bearer_add,
 159                 .policy = tipc_nl_policy,
 160         },
 161         {
 162                 .cmd    = TIPC_NL_BEARER_SET,
 163                 .doit   = tipc_nl_bearer_set,
 164                 .policy = tipc_nl_policy,
 165         },
 166         {
 167                 .cmd    = TIPC_NL_SOCK_GET,
 168                 .dumpit = tipc_nl_sk_dump,
 169                 .policy = tipc_nl_policy,
 170         },
 171         {
 172                 .cmd    = TIPC_NL_PUBL_GET,
 173                 .dumpit = tipc_nl_publ_dump,
 174                 .policy = tipc_nl_policy,
 175         },
 176         {
 177                 .cmd    = TIPC_NL_LINK_GET,
 178                 .doit   = tipc_nl_node_get_link,
 179                 .dumpit = tipc_nl_node_dump_link,
 180                 .policy = tipc_nl_policy,
 181         },
 182         {
 183                 .cmd    = TIPC_NL_LINK_SET,
 184                 .doit   = tipc_nl_node_set_link,
 185                 .policy = tipc_nl_policy,
 186         },
 187         {
 188                 .cmd    = TIPC_NL_LINK_RESET_STATS,
 189                 .doit   = tipc_nl_node_reset_link_stats,
 190                 .policy = tipc_nl_policy,
 191         },
 192         {
 193                 .cmd    = TIPC_NL_MEDIA_GET,
 194                 .doit   = tipc_nl_media_get,
 195                 .dumpit = tipc_nl_media_dump,
 196                 .policy = tipc_nl_policy,
 197         },
 198         {
 199                 .cmd    = TIPC_NL_MEDIA_SET,
 200                 .doit   = tipc_nl_media_set,
 201                 .policy = tipc_nl_policy,
 202         },
 203         {
 204                 .cmd    = TIPC_NL_NODE_GET,
 205                 .dumpit = tipc_nl_node_dump,
 206                 .policy = tipc_nl_policy,
 207         },
 208         {
 209                 .cmd    = TIPC_NL_NET_GET,
 210                 .dumpit = tipc_nl_net_dump,
 211                 .policy = tipc_nl_policy,
 212         },
 213         {
 214                 .cmd    = TIPC_NL_NET_SET,
 215                 .doit   = tipc_nl_net_set,
 216                 .policy = tipc_nl_policy,
 217         },
 218         {
 219                 .cmd    = TIPC_NL_NAME_TABLE_GET,
 220                 .dumpit = tipc_nl_name_table_dump,
 221                 .policy = tipc_nl_policy,
 222         },
 223         {
 224                 .cmd    = TIPC_NL_MON_SET,
 225                 .doit   = tipc_nl_node_set_monitor,
 226                 .policy = tipc_nl_policy,
 227         },
 228         {
 229                 .cmd    = TIPC_NL_MON_GET,
 230                 .doit   = tipc_nl_node_get_monitor,
 231                 .dumpit = tipc_nl_node_dump_monitor,
 232                 .policy = tipc_nl_policy,
 233         },
 234         {
 235                 .cmd    = TIPC_NL_MON_PEER_GET,
 236                 .dumpit = tipc_nl_node_dump_monitor_peer,
 237                 .policy = tipc_nl_policy,
 238         },
 239         {
 240                 .cmd    = TIPC_NL_PEER_REMOVE,
 241                 .doit   = tipc_nl_peer_rm,
 242                 .policy = tipc_nl_policy,
 243         },
 244 #ifdef CONFIG_TIPC_MEDIA_UDP
 245         {
 246                 .cmd    = TIPC_NL_UDP_GET_REMOTEIP,
 247                 .dumpit = tipc_udp_nl_dump_remoteip,
 248                 .policy = tipc_nl_policy,
 249         },
 250 #endif
 251 };
 252
 253 struct genl_family tipc_genl_family __ro_after_init = {
 254         .name           = TIPC_GENL_V2_NAME,
 255         .version        = TIPC_GENL_V2_VERSION,
 256         .hdrsize        = 0,
 257         .maxattr        = TIPC_NLA_MAX,
 258         .netnsok        = true,
 259         .module         = THIS_MODULE,
 260         .ops            = tipc_genl_v2_ops,
 261         .n_ops          = ARRAY_SIZE(tipc_genl_v2_ops),
 262 };
 263
 264 int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
 265 {
 266         u32 maxattr = tipc_genl_family.maxattr;
 267
 268         *attr = genl_family_attrbuf(&tipc_genl_family);
 269         if (!*attr)
 270                 return -EOPNOTSUPP;
 271
 272         return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy,
 273                            NULL);
 274 }
 275
 276 int __init tipc_netlink_start(void)
 277 {
 278         int res;
 279
 280         res = genl_register_family(&tipc_genl_family);
 281         if (res) {
 282                 pr_err("Failed to register netlink interface\n");
 283                 return res;
 284         }
 285         return 0;
 286 }
 287
 288 void tipc_netlink_stop(void)
 289 {
 290         genl_unregister_family(&tipc_genl_family);
 291 }