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 <net/genetlink.h>
  45
  46 static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
  47         [TIPC_NLA_UNSPEC]       = { .type = NLA_UNSPEC, },
  48         [TIPC_NLA_BEARER]       = { .type = NLA_NESTED, },
  49         [TIPC_NLA_SOCK]         = { .type = NLA_NESTED, },
  50         [TIPC_NLA_PUBL]         = { .type = NLA_NESTED, },
  51         [TIPC_NLA_LINK]         = { .type = NLA_NESTED, },
  52         [TIPC_NLA_MEDIA]        = { .type = NLA_NESTED, },
  53         [TIPC_NLA_NODE]         = { .type = NLA_NESTED, },
  54         [TIPC_NLA_NET]          = { .type = NLA_NESTED, },
  55         [TIPC_NLA_NAME_TABLE]   = { .type = NLA_NESTED, },
  56         [TIPC_NLA_MON]          = { .type = NLA_NESTED, },
  57 };
  58
  59 const struct nla_policy
  60 tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
  61         [TIPC_NLA_NAME_TABLE_UNSPEC]    = { .type = NLA_UNSPEC },
  62         [TIPC_NLA_NAME_TABLE_PUBL]      = { .type = NLA_NESTED }
  63 };
  64
  65 const struct nla_policy tipc_nl_monitor_policy[TIPC_NLA_MON_MAX + 1] = {
  66         [TIPC_NLA_MON_UNSPEC]                   = { .type = NLA_UNSPEC },
  67         [TIPC_NLA_MON_REF]                      = { .type = NLA_U32 },
  68         [TIPC_NLA_MON_ACTIVATION_THRESHOLD]     = { .type = NLA_U32 },
  69 };
  70
  71 const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
  72         [TIPC_NLA_SOCK_UNSPEC]          = { .type = NLA_UNSPEC },
  73         [TIPC_NLA_SOCK_ADDR]            = { .type = NLA_U32 },
  74         [TIPC_NLA_SOCK_REF]             = { .type = NLA_U32 },
  75         [TIPC_NLA_SOCK_CON]             = { .type = NLA_NESTED },
  76         [TIPC_NLA_SOCK_HAS_PUBL]        = { .type = NLA_FLAG }
  77 };
  78
  79 const struct nla_policy tipc_nl_net_policy[TIPC_NLA_NET_MAX + 1] = {
  80         [TIPC_NLA_NET_UNSPEC]           = { .type = NLA_UNSPEC },
  81         [TIPC_NLA_NET_ID]               = { .type = NLA_U32 }
  82 };
  83
  84 const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
  85         [TIPC_NLA_LINK_UNSPEC]          = { .type = NLA_UNSPEC },
  86         [TIPC_NLA_LINK_NAME]            = { .type = NLA_STRING,
  87                                             .len = TIPC_MAX_LINK_NAME },
  88         [TIPC_NLA_LINK_MTU]             = { .type = NLA_U32 },
  89         [TIPC_NLA_LINK_BROADCAST]       = { .type = NLA_FLAG },
  90         [TIPC_NLA_LINK_UP]              = { .type = NLA_FLAG },
  91         [TIPC_NLA_LINK_ACTIVE]          = { .type = NLA_FLAG },
  92         [TIPC_NLA_LINK_PROP]            = { .type = NLA_NESTED },
  93         [TIPC_NLA_LINK_STATS]           = { .type = NLA_NESTED },
  94         [TIPC_NLA_LINK_RX]              = { .type = NLA_U32 },
  95         [TIPC_NLA_LINK_TX]              = { .type = NLA_U32 }
  96 };
  97
  98 const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
  99         [TIPC_NLA_NODE_UNSPEC]          = { .type = NLA_UNSPEC },
 100         [TIPC_NLA_NODE_ADDR]            = { .type = NLA_U32 },
 101         [TIPC_NLA_NODE_UP]              = { .type = NLA_FLAG }
 102 };
 103
 104 /* Properties valid for media, bearer and link */
 105 const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
 106         [TIPC_NLA_PROP_UNSPEC]          = { .type = NLA_UNSPEC },
 107         [TIPC_NLA_PROP_PRIO]            = { .type = NLA_U32 },
 108         [TIPC_NLA_PROP_TOL]             = { .type = NLA_U32 },
 109         [TIPC_NLA_PROP_WIN]             = { .type = NLA_U32 }
 110 };
 111
 112 const struct nla_policy tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]  = {
 113         [TIPC_NLA_BEARER_UNSPEC]        = { .type = NLA_UNSPEC },
 114         [TIPC_NLA_BEARER_NAME]          = { .type = NLA_STRING,
 115                                             .len = TIPC_MAX_BEARER_NAME },
 116         [TIPC_NLA_BEARER_PROP]          = { .type = NLA_NESTED },
 117         [TIPC_NLA_BEARER_DOMAIN]        = { .type = NLA_U32 }
 118 };
 119
 120 const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
 121         [TIPC_NLA_MEDIA_UNSPEC]         = { .type = NLA_UNSPEC },
 122         [TIPC_NLA_MEDIA_NAME]           = { .type = NLA_STRING },
 123         [TIPC_NLA_MEDIA_PROP]           = { .type = NLA_NESTED }
 124 };
 125
 126 const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
 127         [TIPC_NLA_UDP_UNSPEC]   = {.type = NLA_UNSPEC},
 128         [TIPC_NLA_UDP_LOCAL]    = {.type = NLA_BINARY,
 129                                    .len = sizeof(struct sockaddr_storage)},
 130         [TIPC_NLA_UDP_REMOTE]   = {.type = NLA_BINARY,
 131                                    .len = sizeof(struct sockaddr_storage)},
 132 };
 133
 134 /* Users of the legacy API (tipc-config) can't handle that we add operations,
 135  * so we have a separate genl handling for the new API.
 136  */
 137 struct genl_family tipc_genl_family = {
 138         .id             = GENL_ID_GENERATE,
 139         .name           = TIPC_GENL_V2_NAME,
 140         .version        = TIPC_GENL_V2_VERSION,
 141         .hdrsize        = 0,
 142         .maxattr        = TIPC_NLA_MAX,
 143         .netnsok        = true,
 144 };
 145
 146 static const struct genl_ops tipc_genl_v2_ops[] = {
 147         {
 148                 .cmd    = TIPC_NL_BEARER_DISABLE,
 149                 .doit   = tipc_nl_bearer_disable,
 150                 .policy = tipc_nl_policy,
 151         },
 152         {
 153                 .cmd    = TIPC_NL_BEARER_ENABLE,
 154                 .doit   = tipc_nl_bearer_enable,
 155                 .policy = tipc_nl_policy,
 156         },
 157         {
 158                 .cmd    = TIPC_NL_BEARER_GET,
 159                 .doit   = tipc_nl_bearer_get,
 160                 .dumpit = tipc_nl_bearer_dump,
 161                 .policy = tipc_nl_policy,
 162         },
 163         {
 164                 .cmd    = TIPC_NL_BEARER_SET,
 165                 .doit   = tipc_nl_bearer_set,
 166                 .policy = tipc_nl_policy,
 167         },
 168         {
 169                 .cmd    = TIPC_NL_SOCK_GET,
 170                 .dumpit = tipc_nl_sk_dump,
 171                 .policy = tipc_nl_policy,
 172         },
 173         {
 174                 .cmd    = TIPC_NL_PUBL_GET,
 175                 .dumpit = tipc_nl_publ_dump,
 176                 .policy = tipc_nl_policy,
 177         },
 178         {
 179                 .cmd    = TIPC_NL_LINK_GET,
 180                 .doit   = tipc_nl_node_get_link,
 181                 .dumpit = tipc_nl_node_dump_link,
 182                 .policy = tipc_nl_policy,
 183         },
 184         {
 185                 .cmd    = TIPC_NL_LINK_SET,
 186                 .doit   = tipc_nl_node_set_link,
 187                 .policy = tipc_nl_policy,
 188         },
 189         {
 190                 .cmd    = TIPC_NL_LINK_RESET_STATS,
 191                 .doit   = tipc_nl_node_reset_link_stats,
 192                 .policy = tipc_nl_policy,
 193         },
 194         {
 195                 .cmd    = TIPC_NL_MEDIA_GET,
 196                 .doit   = tipc_nl_media_get,
 197                 .dumpit = tipc_nl_media_dump,
 198                 .policy = tipc_nl_policy,
 199         },
 200         {
 201                 .cmd    = TIPC_NL_MEDIA_SET,
 202                 .doit   = tipc_nl_media_set,
 203                 .policy = tipc_nl_policy,
 204         },
 205         {
 206                 .cmd    = TIPC_NL_NODE_GET,
 207                 .dumpit = tipc_nl_node_dump,
 208                 .policy = tipc_nl_policy,
 209         },
 210         {
 211                 .cmd    = TIPC_NL_NET_GET,
 212                 .dumpit = tipc_nl_net_dump,
 213                 .policy = tipc_nl_policy,
 214         },
 215         {
 216                 .cmd    = TIPC_NL_NET_SET,
 217                 .doit   = tipc_nl_net_set,
 218                 .policy = tipc_nl_policy,
 219         },
 220         {
 221                 .cmd    = TIPC_NL_NAME_TABLE_GET,
 222                 .dumpit = tipc_nl_name_table_dump,
 223                 .policy = tipc_nl_policy,
 224         },
 225         {
 226                 .cmd    = TIPC_NL_MON_SET,
 227                 .doit   = tipc_nl_node_set_monitor,
 228                 .policy = tipc_nl_policy,
 229         },
 230         {
 231                 .cmd    = TIPC_NL_MON_GET,
 232                 .doit   = tipc_nl_node_get_monitor,
 233                 .dumpit = tipc_nl_node_dump_monitor,
 234                 .policy = tipc_nl_policy,
 235         },
 236         {
 237                 .cmd    = TIPC_NL_MON_PEER_GET,
 238                 .dumpit = tipc_nl_node_dump_monitor_peer,
 239                 .policy = tipc_nl_policy,
 240         },
 241 };
 242
 243 int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
 244 {
 245         u32 maxattr = tipc_genl_family.maxattr;
 246
 247         *attr = tipc_genl_family.attrbuf;
 248         if (!*attr)
 249                 return -EOPNOTSUPP;
 250
 251         return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy);
 252 }
 253
 254 int tipc_netlink_start(void)
 255 {
 256         int res;
 257
 258         res = genl_register_family_with_ops(&tipc_genl_family,
 259                                             tipc_genl_v2_ops);
 260         if (res) {
 261                 pr_err("Failed to register netlink interface\n");
 262                 return res;
 263         }
 264         return 0;
 265 }
 266
 267 void tipc_netlink_stop(void)
 268 {
 269         genl_unregister_family(&tipc_genl_family);
 270 }