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