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(rep_buf, NETLINK_CB(skb).pid); 66 } 67 68 return 0; 69 } 70 71 static struct genl_family 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 ops = { 80 .cmd = TIPC_GENL_CMD, 81 .doit = handle_cmd, 82 }; 83 84 static int family_registered = 0; 85 86 int tipc_netlink_start(void) 87 { 88 89 90 if (genl_register_family(&family)) 91 goto err; 92 93 family_registered = 1; 94 95 if (genl_register_ops(&family, &ops)) 96 goto err_unregister; 97 98 return 0; 99 100 err_unregister: 101 genl_unregister_family(&family); 102 family_registered = 0; 103 err: 104 err("Failed to register netlink interface\n"); 105 return -EFAULT; 106 } 107 108 void tipc_netlink_stop(void) 109 { 110 if (family_registered) { 111 genl_unregister_family(&family); 112 family_registered = 0; 113 } 114 } 115