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 "bearer.h"
  40 #include <net/genetlink.h>
  41
  42 static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
  43 {
  44         struct sk_buff *rep_buf;
  45         struct nlmsghdr *rep_nlh;
  46         struct nlmsghdr *req_nlh = info->nlhdr;
  47         struct tipc_genlmsghdr *req_userhdr = info->userhdr;
  48         int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
  49         u16 cmd;
  50
  51         if ((req_userhdr->cmd & 0xC000) && (!netlink_capable(skb, CAP_NET_ADMIN)))
  52                 cmd = TIPC_CMD_NOT_NET_ADMIN;
  53         else
  54                 cmd = req_userhdr->cmd;
  55
  56         rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, cmd,
  57                         nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN,
  58                         nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN),
  59                         hdr_space);
  60
  61         if (rep_buf) {
  62                 skb_push(rep_buf, hdr_space);
  63                 rep_nlh = nlmsg_hdr(rep_buf);
  64                 memcpy(rep_nlh, req_nlh, hdr_space);
  65                 rep_nlh->nlmsg_len = rep_buf->len;
  66                 genlmsg_unicast(&init_net, rep_buf, NETLINK_CB(skb).portid);
  67         }
  68
  69         return 0;
  70 }
  71
  72 static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = {
  73         [TIPC_NLA_UNSPEC]       = { .type = NLA_UNSPEC, },
  74         [TIPC_NLA_BEARER]       = { .type = NLA_NESTED, },
  75 };
  76
  77 /* Legacy ASCII API */
  78 static struct genl_family tipc_genl_family = {
  79         .id             = GENL_ID_GENERATE,
  80         .name           = TIPC_GENL_NAME,
  81         .version        = TIPC_GENL_VERSION,
  82         .hdrsize        = TIPC_GENL_HDRLEN,
  83         .maxattr        = 0,
  84 };
  85
  86 /* Legacy ASCII API */
  87 static struct genl_ops tipc_genl_ops[] = {
  88         {
  89                 .cmd            = TIPC_GENL_CMD,
  90                 .doit           = handle_cmd,
  91         },
  92 };
  93
  94 /* Users of the legacy API (tipc-config) can't handle that we add operations,
  95  * so we have a separate genl handling for the new API.
  96  */
  97 struct genl_family tipc_genl_v2_family = {
  98         .id             = GENL_ID_GENERATE,
  99         .name           = TIPC_GENL_V2_NAME,
 100         .version        = TIPC_GENL_V2_VERSION,
 101         .hdrsize        = 0,
 102         .maxattr        = TIPC_NLA_MAX,
 103 };
 104
 105 static const struct genl_ops tipc_genl_v2_ops[] = {
 106         {
 107                 .cmd    = TIPC_NL_BEARER_DISABLE,
 108                 .doit   = tipc_nl_bearer_disable,
 109                 .policy = tipc_nl_policy,
 110         },
 111         {
 112                 .cmd    = TIPC_NL_BEARER_ENABLE,
 113                 .doit   = tipc_nl_bearer_enable,
 114                 .policy = tipc_nl_policy,
 115         },
 116         {
 117                 .cmd    = TIPC_NL_BEARER_GET,
 118                 .doit   = tipc_nl_bearer_get,
 119                 .dumpit = tipc_nl_bearer_dump,
 120                 .policy = tipc_nl_policy,
 121         }
 122 };
 123
 124 int tipc_netlink_start(void)
 125 {
 126         int res;
 127
 128         res = genl_register_family_with_ops(&tipc_genl_family, tipc_genl_ops);
 129         if (res) {
 130                 pr_err("Failed to register legacy interface\n");
 131                 return res;
 132         }
 133
 134         res = genl_register_family_with_ops(&tipc_genl_v2_family,
 135                                             tipc_genl_v2_ops);
 136         if (res) {
 137                 pr_err("Failed to register netlink interface\n");
 138                 return res;
 139         }
 140         return 0;
 141 }
 142
 143 void tipc_netlink_stop(void)
 144 {
 145         genl_unregister_family(&tipc_genl_family);
 146         genl_unregister_family(&tipc_genl_v2_family);
 147 }