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 };
  57
  58 const struct nla_policy
  59 tipc_nl_name_table_policy[TIPC_NLA_NAME_TABLE_MAX + 1] = {
  60         [TIPC_NLA_NAME_TABLE_UNSPEC]    = { .type = NLA_UNSPEC },
  61         [TIPC_NLA_NAME_TABLE_PUBL]      = { .type = NLA_NESTED }
  62 };
  63
  64 const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
  65         [TIPC_NLA_SOCK_UNSPEC]          = { .type = NLA_UNSPEC },
  66         [TIPC_NLA_SOCK_ADDR]            = { .type = NLA_U32 },
  67         [TIPC_NLA_SOCK_REF]             = { .type = NLA_U32 },
  68         [TIPC_NLA_SOCK_CON]             = { .type = NLA_NESTED },
  69         [TIPC_NLA_SOCK_HAS_PUBL]        = { .type = NLA_FLAG }
  70 };
  71
  72 const struct nla_policy tipc_nl_net_policy[TIPC_NLA_NET_MAX + 1] = {
  73         [TIPC_NLA_NET_UNSPEC]           = { .type = NLA_UNSPEC },
  74         [TIPC_NLA_NET_ID]               = { .type = NLA_U32 }
  75 };
  76
  77 const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
  78         [TIPC_NLA_LINK_UNSPEC]          = { .type = NLA_UNSPEC },
  79         [TIPC_NLA_LINK_NAME]            = { .type = NLA_STRING,
  80                                             .len = TIPC_MAX_LINK_NAME },
  81         [TIPC_NLA_LINK_MTU]             = { .type = NLA_U32 },
  82         [TIPC_NLA_LINK_BROADCAST]       = { .type = NLA_FLAG },
  83         [TIPC_NLA_LINK_UP]              = { .type = NLA_FLAG },
  84         [TIPC_NLA_LINK_ACTIVE]          = { .type = NLA_FLAG },
  85         [TIPC_NLA_LINK_PROP]            = { .type = NLA_NESTED },
  86         [TIPC_NLA_LINK_STATS]           = { .type = NLA_NESTED },
  87         [TIPC_NLA_LINK_RX]              = { .type = NLA_U32 },
  88         [TIPC_NLA_LINK_TX]              = { .type = NLA_U32 }
  89 };
  90
  91 const struct nla_policy tipc_nl_node_policy[TIPC_NLA_NODE_MAX + 1] = {
  92         [TIPC_NLA_NODE_UNSPEC]          = { .type = NLA_UNSPEC },
  93         [TIPC_NLA_NODE_ADDR]            = { .type = NLA_U32 },
  94         [TIPC_NLA_NODE_UP]              = { .type = NLA_FLAG }
  95 };
  96
  97 /* Properties valid for media, bearer and link */
  98 const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
  99         [TIPC_NLA_PROP_UNSPEC]          = { .type = NLA_UNSPEC },
 100         [TIPC_NLA_PROP_PRIO]            = { .type = NLA_U32 },
 101         [TIPC_NLA_PROP_TOL]             = { .type = NLA_U32 },
 102         [TIPC_NLA_PROP_WIN]             = { .type = NLA_U32 }
 103 };
 104
 105 const struct nla_policy tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1]  = {
 106         [TIPC_NLA_BEARER_UNSPEC]        = { .type = NLA_UNSPEC },
 107         [TIPC_NLA_BEARER_NAME]          = { .type = NLA_STRING,
 108                                             .len = TIPC_MAX_BEARER_NAME },
 109         [TIPC_NLA_BEARER_PROP]          = { .type = NLA_NESTED },
 110         [TIPC_NLA_BEARER_DOMAIN]        = { .type = NLA_U32 }
 111 };
 112
 113 const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
 114         [TIPC_NLA_MEDIA_UNSPEC]         = { .type = NLA_UNSPEC },
 115         [TIPC_NLA_MEDIA_NAME]           = { .type = NLA_STRING },
 116         [TIPC_NLA_MEDIA_PROP]           = { .type = NLA_NESTED }
 117 };
 118
 119 const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
 120         [TIPC_NLA_UDP_UNSPEC]   = {.type = NLA_UNSPEC},
 121         [TIPC_NLA_UDP_LOCAL]    = {.type = NLA_BINARY,
 122                                    .len = sizeof(struct sockaddr_storage)},
 123         [TIPC_NLA_UDP_REMOTE]   = {.type = NLA_BINARY,
 124                                    .len = sizeof(struct sockaddr_storage)},
 125 };
 126
 127 /* Users of the legacy API (tipc-config) can't handle that we add operations,
 128  * so we have a separate genl handling for the new API.
 129  */
 130 struct genl_family tipc_genl_family = {
 131         .id             = GENL_ID_GENERATE,
 132         .name           = TIPC_GENL_V2_NAME,
 133         .version        = TIPC_GENL_V2_VERSION,
 134         .hdrsize        = 0,
 135         .maxattr        = TIPC_NLA_MAX,
 136         .netnsok        = true,
 137 };
 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_SET,
 158                 .doit   = tipc_nl_bearer_set,
 159                 .policy = tipc_nl_policy,
 160         },
 161         {
 162                 .cmd    = TIPC_NL_SOCK_GET,
 163                 .dumpit = tipc_nl_sk_dump,
 164                 .policy = tipc_nl_policy,
 165         },
 166         {
 167                 .cmd    = TIPC_NL_PUBL_GET,
 168                 .dumpit = tipc_nl_publ_dump,
 169                 .policy = tipc_nl_policy,
 170         },
 171         {
 172                 .cmd    = TIPC_NL_LINK_GET,
 173                 .doit   = tipc_nl_node_get_link,
 174                 .dumpit = tipc_nl_node_dump_link,
 175                 .policy = tipc_nl_policy,
 176         },
 177         {
 178                 .cmd    = TIPC_NL_LINK_SET,
 179                 .doit   = tipc_nl_node_set_link,
 180                 .policy = tipc_nl_policy,
 181         },
 182         {
 183                 .cmd    = TIPC_NL_LINK_RESET_STATS,
 184                 .doit   = tipc_nl_node_reset_link_stats,
 185                 .policy = tipc_nl_policy,
 186         },
 187         {
 188                 .cmd    = TIPC_NL_MEDIA_GET,
 189                 .doit   = tipc_nl_media_get,
 190                 .dumpit = tipc_nl_media_dump,
 191                 .policy = tipc_nl_policy,
 192         },
 193         {
 194                 .cmd    = TIPC_NL_MEDIA_SET,
 195                 .doit   = tipc_nl_media_set,
 196                 .policy = tipc_nl_policy,
 197         },
 198         {
 199                 .cmd    = TIPC_NL_NODE_GET,
 200                 .dumpit = tipc_nl_node_dump,
 201                 .policy = tipc_nl_policy,
 202         },
 203         {
 204                 .cmd    = TIPC_NL_NET_GET,
 205                 .dumpit = tipc_nl_net_dump,
 206                 .policy = tipc_nl_policy,
 207         },
 208         {
 209                 .cmd    = TIPC_NL_NET_SET,
 210                 .doit   = tipc_nl_net_set,
 211                 .policy = tipc_nl_policy,
 212         },
 213         {
 214                 .cmd    = TIPC_NL_NAME_TABLE_GET,
 215                 .dumpit = tipc_nl_name_table_dump,
 216                 .policy = tipc_nl_policy,
 217         }
 218 };
 219
 220 int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
 221 {
 222         u32 maxattr = tipc_genl_family.maxattr;
 223
 224         *attr = tipc_genl_family.attrbuf;
 225         if (!*attr)
 226                 return -EOPNOTSUPP;
 227
 228         return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy);
 229 }
 230
 231 int tipc_netlink_start(void)
 232 {
 233         int res;
 234
 235         res = genl_register_family_with_ops(&tipc_genl_family,
 236                                             tipc_genl_v2_ops);
 237         if (res) {
 238                 pr_err("Failed to register netlink interface\n");
 239                 return res;
 240         }
 241         return 0;
 242 }
 243
 244 void tipc_netlink_stop(void)
 245 {
 246         genl_unregister_family(&tipc_genl_family);
 247 }