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 "config.h"
  39 #include "socket.h"
  40 #include "name_table.h"
  41 #include "bearer.h"
  42 #include "link.h"
  43 #include "node.h"
  44 #include "net.h"
  45 #include <net/genetlink.h>
  46
  47 static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
  48 {
  49         struct net *net = genl_info_net(info);
  50         struct sk_buff *rep_buf;
  51         struct nlmsghdr *rep_nlh;
  52         struct nlmsghdr *req_nlh = info->nlhdr;
  53         struct tipc_genlmsghdr *req_userhdr = info->userhdr;
  54         int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
  55         u16 cmd;
  56
  57         if ((req_userhdr->cmd & 0xC000) && (!netlink_capable(skb, CAP_NET_ADMIN)))
  58                 cmd = TIPC_CMD_NOT_NET_ADMIN;
  59         else
  60                 cmd = req_userhdr->cmd;
  61
  62         rep_buf = tipc_cfg_do_cmd(net, req_userhdr->dest, cmd,
  63                                   nlmsg_data(req_nlh) + GENL_HDRLEN +
  64                                   TIPC_GENL_HDRLEN,
  65                                   nlmsg_attrlen(req_nlh, GENL_HDRLEN +
  66                                   TIPC_GENL_HDRLEN), hdr_space);
  67
  68         if (rep_buf) {
  69                 skb_push(rep_buf, hdr_space);
  70                 rep_nlh = nlmsg_hdr(rep_buf);
  71                 memcpy(rep_nlh, req_nlh, hdr_space);
  72                 rep_nlh->nlmsg_len = rep_buf->len;
  73                 genlmsg_unicast(&init_net, rep_buf, NETLINK_CB(skb).portid);
  74         }
  75
  76         return 0;
  77 }
  78
  79 static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
  80         [TIPC_NLA_UNSPEC]       = { .type = NLA_UNSPEC, },
  81         [TIPC_NLA_BEARER]       = { .type = NLA_NESTED, },
  82         [TIPC_NLA_SOCK]         = { .type = NLA_NESTED, },
  83         [TIPC_NLA_PUBL]         = { .type = NLA_NESTED, },
  84         [TIPC_NLA_LINK]         = { .type = NLA_NESTED, },
  85         [TIPC_NLA_MEDIA]        = { .type = NLA_NESTED, },
  86         [TIPC_NLA_NODE]         = { .type = NLA_NESTED, },
  87         [TIPC_NLA_NET]          = { .type = NLA_NESTED, },
  88         [TIPC_NLA_NAME_TABLE]   = { .type = NLA_NESTED, }
  89 };
  90
  91 /* Legacy ASCII API */
  92 static struct genl_family tipc_genl_family = {
  93         .id             = GENL_ID_GENERATE,
  94         .name           = TIPC_GENL_NAME,
  95         .version        = TIPC_GENL_VERSION,
  96         .hdrsize        = TIPC_GENL_HDRLEN,
  97         .maxattr        = 0,
  98 };
  99
 100 /* Legacy ASCII API */
 101 static struct genl_ops tipc_genl_ops[] = {
 102         {
 103                 .cmd            = TIPC_GENL_CMD,
 104                 .doit           = handle_cmd,
 105         },
 106 };
 107
 108 /* Users of the legacy API (tipc-config) can't handle that we add operations,
 109  * so we have a separate genl handling for the new API.
 110  */
 111 struct genl_family tipc_genl_v2_family = {
 112         .id             = GENL_ID_GENERATE,
 113         .name           = TIPC_GENL_V2_NAME,
 114         .version        = TIPC_GENL_V2_VERSION,
 115         .hdrsize        = 0,
 116         .maxattr        = TIPC_NLA_MAX,
 117 };
 118
 119 static const struct genl_ops tipc_genl_v2_ops[] = {
 120         {
 121                 .cmd    = TIPC_NL_BEARER_DISABLE,
 122                 .doit   = tipc_nl_bearer_disable,
 123                 .policy = tipc_nl_policy,
 124         },
 125         {
 126                 .cmd    = TIPC_NL_BEARER_ENABLE,
 127                 .doit   = tipc_nl_bearer_enable,
 128                 .policy = tipc_nl_policy,
 129         },
 130         {
 131                 .cmd    = TIPC_NL_BEARER_GET,
 132                 .doit   = tipc_nl_bearer_get,
 133                 .dumpit = tipc_nl_bearer_dump,
 134                 .policy = tipc_nl_policy,
 135         },
 136         {
 137                 .cmd    = TIPC_NL_BEARER_SET,
 138                 .doit   = tipc_nl_bearer_set,
 139                 .policy = tipc_nl_policy,
 140         },
 141         {
 142                 .cmd    = TIPC_NL_SOCK_GET,
 143                 .dumpit = tipc_nl_sk_dump,
 144                 .policy = tipc_nl_policy,
 145         },
 146         {
 147                 .cmd    = TIPC_NL_PUBL_GET,
 148                 .dumpit = tipc_nl_publ_dump,
 149                 .policy = tipc_nl_policy,
 150         },
 151         {
 152                 .cmd    = TIPC_NL_LINK_GET,
 153                 .doit   = tipc_nl_link_get,
 154                 .dumpit = tipc_nl_link_dump,
 155                 .policy = tipc_nl_policy,
 156         },
 157         {
 158                 .cmd    = TIPC_NL_LINK_SET,
 159                 .doit   = tipc_nl_link_set,
 160                 .policy = tipc_nl_policy,
 161         },
 162         {
 163                 .cmd    = TIPC_NL_LINK_RESET_STATS,
 164                 .doit   = tipc_nl_link_reset_stats,
 165                 .policy = tipc_nl_policy,
 166         },
 167         {
 168                 .cmd    = TIPC_NL_MEDIA_GET,
 169                 .doit   = tipc_nl_media_get,
 170                 .dumpit = tipc_nl_media_dump,
 171                 .policy = tipc_nl_policy,
 172         },
 173         {
 174                 .cmd    = TIPC_NL_MEDIA_SET,
 175                 .doit   = tipc_nl_media_set,
 176                 .policy = tipc_nl_policy,
 177         },
 178         {
 179                 .cmd    = TIPC_NL_NODE_GET,
 180                 .dumpit = tipc_nl_node_dump,
 181                 .policy = tipc_nl_policy,
 182         },
 183         {
 184                 .cmd    = TIPC_NL_NET_GET,
 185                 .dumpit = tipc_nl_net_dump,
 186                 .policy = tipc_nl_policy,
 187         },
 188         {
 189                 .cmd    = TIPC_NL_NET_SET,
 190                 .doit   = tipc_nl_net_set,
 191                 .policy = tipc_nl_policy,
 192         },
 193         {
 194                 .cmd    = TIPC_NL_NAME_TABLE_GET,
 195                 .dumpit = tipc_nl_name_table_dump,
 196                 .policy = tipc_nl_policy,
 197         }
 198 };
 199
 200 int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr)
 201 {
 202         u32 maxattr = tipc_genl_v2_family.maxattr;
 203
 204         *attr = tipc_genl_v2_family.attrbuf;
 205         if (!*attr)
 206                 return -EOPNOTSUPP;
 207
 208         return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy);
 209 }
 210
 211 int tipc_netlink_start(void)
 212 {
 213         int res;
 214
 215         res = genl_register_family_with_ops(&tipc_genl_family, tipc_genl_ops);
 216         if (res) {
 217                 pr_err("Failed to register legacy interface\n");
 218                 return res;
 219         }
 220
 221         res = genl_register_family_with_ops(&tipc_genl_v2_family,
 222                                             tipc_genl_v2_ops);
 223         if (res) {
 224                 pr_err("Failed to register netlink interface\n");
 225                 return res;
 226         }
 227         return 0;
 228 }
 229
 230 void tipc_netlink_stop(void)
 231 {
 232         genl_unregister_family(&tipc_genl_family);
 233         genl_unregister_family(&tipc_genl_v2_family);
 234 }