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| 1 | /* |
| 2 | * net/tipc/netlink.c: TIPC configuration handling |
| 3 | * |
| 4 | * Copyright (c) 2005-2006, 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 <net/genetlink.h> |
| 40 | |
| 41 | static int handle_cmd(struct sk_buff *skb, struct genl_info *info) |
| 42 | { |
| 43 | struct sk_buff *rep_buf; |
| 44 | struct nlmsghdr *rep_nlh; |
| 45 | struct nlmsghdr *req_nlh = info->nlhdr; |
| 46 | struct tipc_genlmsghdr *req_userhdr = info->userhdr; |
| 47 | int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN); |
| 48 | u16 cmd; |
| 49 | |
| 50 | if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN))) |
| 51 | cmd = TIPC_CMD_NOT_NET_ADMIN; |
| 52 | else |
| 53 | cmd = req_userhdr->cmd; |
| 54 | |
| 55 | rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, cmd, |
| 56 | NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN, |
| 57 | NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN), |
| 58 | hdr_space); |
| 59 | |
| 60 | if (rep_buf) { |
| 61 | skb_push(rep_buf, hdr_space); |
| 62 | rep_nlh = nlmsg_hdr(rep_buf); |
| 63 | memcpy(rep_nlh, req_nlh, hdr_space); |
| 64 | rep_nlh->nlmsg_len = rep_buf->len; |
| 65 | genlmsg_unicast(&init_net, rep_buf, NETLINK_CB(skb).pid); |
| 66 | } |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static struct genl_family tipc_genl_family = { |
| 72 | .id = GENL_ID_GENERATE, |
| 73 | .name = TIPC_GENL_NAME, |
| 74 | .version = TIPC_GENL_VERSION, |
| 75 | .hdrsize = TIPC_GENL_HDRLEN, |
| 76 | .maxattr = 0, |
| 77 | }; |
| 78 | |
| 79 | static struct genl_ops tipc_genl_ops = { |
| 80 | .cmd = TIPC_GENL_CMD, |
| 81 | .doit = handle_cmd, |
| 82 | }; |
| 83 | |
| 84 | static int tipc_genl_family_registered; |
| 85 | |
| 86 | int tipc_netlink_start(void) |
| 87 | { |
| 88 | int res; |
| 89 | |
| 90 | res = genl_register_family_with_ops(&tipc_genl_family, |
| 91 | &tipc_genl_ops, 1); |
| 92 | if (res) { |
| 93 | err("Failed to register netlink interface\n"); |
| 94 | return res; |
| 95 | } |
| 96 | |
| 97 | tipc_genl_family_registered = 1; |
| 98 | return 0; |
| 99 | } |
| 100 | |
| 101 | void tipc_netlink_stop(void) |
| 102 | { |
| 103 | if (!tipc_genl_family_registered) |
| 104 | return; |
| 105 | |
| 106 | genl_unregister_family(&tipc_genl_family); |
| 107 | tipc_genl_family_registered = 0; |
| 108 | } |
| 109 |
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Tags:
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od-2011-09-18
v2.6.34-rc5
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