| Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * net/tipc/netlink.c: TIPC configuration handling |
| 3 | * |
| 4 | * Copyright (c) 2005, Wind River Systems |
| 5 | * Copyright (c) 2005-2006, Ericsson AB |
| 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 | * Redistributions of source code must retain the above copyright notice, this |
| 12 | * list of conditions and the following disclaimer. |
| 13 | * Redistributions in binary form must reproduce the above copyright notice, |
| 14 | * this list of conditions and the following disclaimer in the documentation |
| 15 | * and/or other materials provided with the distribution. |
| 16 | * Neither the names of the copyright holders nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from this |
| 18 | * software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 21 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 24 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 30 | * POSSIBILITY OF SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | #include "core.h" |
| 34 | #include "config.h" |
| 35 | #include <net/genetlink.h> |
| 36 | |
| 37 | static int handle_cmd(struct sk_buff *skb, struct genl_info *info) |
| 38 | { |
| 39 | struct sk_buff *rep_buf; |
| 40 | struct nlmsghdr *rep_nlh; |
| 41 | struct nlmsghdr *req_nlh = info->nlhdr; |
| 42 | struct tipc_genlmsghdr *req_userhdr = info->userhdr; |
| 43 | int hdr_space = NLMSG_SPACE(0); |
| 44 | |
| 45 | if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN))) |
| 46 | rep_buf = cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN); |
| 47 | else |
| 48 | rep_buf = cfg_do_cmd(req_userhdr->dest, |
| 49 | req_userhdr->cmd, |
| 50 | NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN, |
| 51 | NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN), |
| 52 | hdr_space); |
| 53 | |
| 54 | if (rep_buf) { |
| 55 | skb_push(rep_buf, hdr_space); |
| 56 | rep_nlh = (struct nlmsghdr *)rep_buf->data; |
| 57 | memcpy(rep_nlh, req_nlh, hdr_space); |
| 58 | rep_nlh->nlmsg_len = rep_buf->len; |
| 59 | genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid); |
| 60 | } |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static struct genl_family family = { |
| 66 | .id = TIPC_GENL_FAMILY, |
| 67 | .name = TIPC_GENL_NAME, |
| 68 | .version = TIPC_GENL_VERSION, |
| 69 | .hdrsize = TIPC_GENL_HDRLEN, |
| 70 | .maxattr = 0, |
| 71 | .owner = THIS_MODULE, |
| 72 | }; |
| 73 | |
| 74 | static struct genl_ops ops = { |
| 75 | .cmd = TIPC_GENL_CMD, |
| 76 | .doit = handle_cmd, |
| 77 | }; |
| 78 | |
| 79 | static int family_registered = 0; |
| 80 | |
| 81 | int netlink_start(void) |
| 82 | { |
| 83 | if (genl_register_family(&family)) |
| 84 | goto err; |
| 85 | |
| 86 | family_registered = 1; |
| 87 | |
| 88 | if (genl_register_ops(&family, &ops)) |
| 89 | goto err_unregister; |
| 90 | |
| 91 | return 0; |
| 92 | |
| 93 | err_unregister: |
| 94 | genl_unregister_family(&family); |
| 95 | family_registered = 0; |
| 96 | err: |
| 97 | err("Failed to register netlink interface"); |
| 98 | return -EFAULT; |
| 99 | } |
| 100 | |
| 101 | void netlink_stop(void) |
| 102 | { |
| 103 | if (family_registered) { |
| 104 | genl_unregister_family(&family); |
| 105 | family_registered = 0; |
| 106 | } |
| 107 | } |