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