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 .cmd = TIPC_NL_BEARER_SET, 124 .doit = tipc_nl_bearer_set, 125 .policy = tipc_nl_policy, 126 } 127 }; 128 129 int tipc_netlink_start(void) 130 { 131 int res; 132 133 res = genl_register_family_with_ops(&tipc_genl_family, tipc_genl_ops); 134 if (res) { 135 pr_err("Failed to register legacy interface\n"); 136 return res; 137 } 138 139 res = genl_register_family_with_ops(&tipc_genl_v2_family, 140 tipc_genl_v2_ops); 141 if (res) { 142 pr_err("Failed to register netlink interface\n"); 143 return res; 144 } 145 return 0; 146 } 147 148 void tipc_netlink_stop(void) 149 { 150 genl_unregister_family(&tipc_genl_family); 151 genl_unregister_family(&tipc_genl_v2_family); 152 } 153