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 "socket.h" 40 #include "bearer.h" 41 #include <net/genetlink.h> 42 43 static int handle_cmd(struct sk_buff *skb, struct genl_info *info) 44 { 45 struct sk_buff *rep_buf; 46 struct nlmsghdr *rep_nlh; 47 struct nlmsghdr *req_nlh = info->nlhdr; 48 struct tipc_genlmsghdr *req_userhdr = info->userhdr; 49 int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN); 50 u16 cmd; 51 52 if ((req_userhdr->cmd & 0xC000) && (!netlink_capable(skb, CAP_NET_ADMIN))) 53 cmd = TIPC_CMD_NOT_NET_ADMIN; 54 else 55 cmd = req_userhdr->cmd; 56 57 rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, cmd, 58 nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN, 59 nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN), 60 hdr_space); 61 62 if (rep_buf) { 63 skb_push(rep_buf, hdr_space); 64 rep_nlh = nlmsg_hdr(rep_buf); 65 memcpy(rep_nlh, req_nlh, hdr_space); 66 rep_nlh->nlmsg_len = rep_buf->len; 67 genlmsg_unicast(&init_net, rep_buf, NETLINK_CB(skb).portid); 68 } 69 70 return 0; 71 } 72 73 static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = { 74 [TIPC_NLA_UNSPEC] = { .type = NLA_UNSPEC, }, 75 [TIPC_NLA_BEARER] = { .type = NLA_NESTED, }, 76 [TIPC_NLA_SOCK] = { .type = NLA_NESTED, }, 77 }; 78 79 /* Legacy ASCII API */ 80 static struct genl_family tipc_genl_family = { 81 .id = GENL_ID_GENERATE, 82 .name = TIPC_GENL_NAME, 83 .version = TIPC_GENL_VERSION, 84 .hdrsize = TIPC_GENL_HDRLEN, 85 .maxattr = 0, 86 }; 87 88 /* Legacy ASCII API */ 89 static struct genl_ops tipc_genl_ops[] = { 90 { 91 .cmd = TIPC_GENL_CMD, 92 .doit = handle_cmd, 93 }, 94 }; 95 96 /* Users of the legacy API (tipc-config) can't handle that we add operations, 97 * so we have a separate genl handling for the new API. 98 */ 99 struct genl_family tipc_genl_v2_family = { 100 .id = GENL_ID_GENERATE, 101 .name = TIPC_GENL_V2_NAME, 102 .version = TIPC_GENL_V2_VERSION, 103 .hdrsize = 0, 104 .maxattr = TIPC_NLA_MAX, 105 }; 106 107 static const struct genl_ops tipc_genl_v2_ops[] = { 108 { 109 .cmd = TIPC_NL_BEARER_DISABLE, 110 .doit = tipc_nl_bearer_disable, 111 .policy = tipc_nl_policy, 112 }, 113 { 114 .cmd = TIPC_NL_BEARER_ENABLE, 115 .doit = tipc_nl_bearer_enable, 116 .policy = tipc_nl_policy, 117 }, 118 { 119 .cmd = TIPC_NL_BEARER_GET, 120 .doit = tipc_nl_bearer_get, 121 .dumpit = tipc_nl_bearer_dump, 122 .policy = tipc_nl_policy, 123 }, 124 { 125 .cmd = TIPC_NL_BEARER_SET, 126 .doit = tipc_nl_bearer_set, 127 .policy = tipc_nl_policy, 128 }, 129 { 130 .cmd = TIPC_NL_SOCK_GET, 131 .dumpit = tipc_nl_sk_dump, 132 .policy = tipc_nl_policy, 133 } 134 }; 135 136 int tipc_netlink_start(void) 137 { 138 int res; 139 140 res = genl_register_family_with_ops(&tipc_genl_family, tipc_genl_ops); 141 if (res) { 142 pr_err("Failed to register legacy interface\n"); 143 return res; 144 } 145 146 res = genl_register_family_with_ops(&tipc_genl_v2_family, 147 tipc_genl_v2_ops); 148 if (res) { 149 pr_err("Failed to register netlink interface\n"); 150 return res; 151 } 152 return 0; 153 } 154 155 void tipc_netlink_stop(void) 156 { 157 genl_unregister_family(&tipc_genl_family); 158 genl_unregister_family(&tipc_genl_v2_family); 159 } 160