/* * net/tipc/netlink.c: TIPC configuration handling * * Copyright (c) 2005-2006, Ericsson AB * Copyright (c) 2005, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include "core.h" #include "config.h" #include <net/genetlink.h> static int handle_cmd(struct sk_buff *skb, struct genl_info *info) { struct sk_buff *rep_buf; struct nlmsghdr *rep_nlh; struct nlmsghdr *req_nlh = info->nlhdr; struct tipc_genlmsghdr *req_userhdr = info->userhdr; int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN); if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN))) rep_buf = tipc_cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN); else rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, req_userhdr->cmd, NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN, NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN), hdr_space); if (rep_buf) { skb_push(rep_buf, hdr_space); rep_nlh = nlmsg_hdr(rep_buf); memcpy(rep_nlh, req_nlh, hdr_space); rep_nlh->nlmsg_len = rep_buf->len; genlmsg_unicast(rep_buf, NETLINK_CB(skb).pid); } return 0; } static struct genl_family family = { .id = GENL_ID_GENERATE, .name = TIPC_GENL_NAME, .version = TIPC_GENL_VERSION, .hdrsize = TIPC_GENL_HDRLEN, .maxattr = 0, }; static struct genl_ops ops = { .cmd = TIPC_GENL_CMD, .doit = handle_cmd, }; static int family_registered = 0; int tipc_netlink_start(void) { if (genl_register_family(&family)) goto err; family_registered = 1; if (genl_register_ops(&family, &ops)) goto err_unregister; return 0; err_unregister: genl_unregister_family(&family); family_registered = 0; err: err("Failed to register netlink interface\n"); return -EFAULT; } void tipc_netlink_stop(void) { if (family_registered) { genl_unregister_family(&family); family_registered = 0; } }