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