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