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 "name_table.h" 41 #include "bearer.h" 42 #include "link.h" 43 #include "node.h" 44 #include "net.h" 45 #include <net/genetlink.h> 46 47 static int handle_cmd(struct sk_buff *skb, struct genl_info *info) 48 { 49 struct net *net = genl_info_net(info); 50 struct sk_buff *rep_buf; 51 struct nlmsghdr *rep_nlh; 52 struct nlmsghdr *req_nlh = info->nlhdr; 53 struct tipc_genlmsghdr *req_userhdr = info->userhdr; 54 int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN); 55 u16 cmd; 56 57 if ((req_userhdr->cmd & 0xC000) && 58 (!netlink_net_capable(skb, CAP_NET_ADMIN))) 59 cmd = TIPC_CMD_NOT_NET_ADMIN; 60 else 61 cmd = req_userhdr->cmd; 62 63 rep_buf = tipc_cfg_do_cmd(net, req_userhdr->dest, cmd, 64 nlmsg_data(req_nlh) + GENL_HDRLEN + 65 TIPC_GENL_HDRLEN, 66 nlmsg_attrlen(req_nlh, GENL_HDRLEN + 67 TIPC_GENL_HDRLEN), hdr_space); 68 69 if (rep_buf) { 70 skb_push(rep_buf, hdr_space); 71 rep_nlh = nlmsg_hdr(rep_buf); 72 memcpy(rep_nlh, req_nlh, hdr_space); 73 rep_nlh->nlmsg_len = rep_buf->len; 74 genlmsg_unicast(net, rep_buf, NETLINK_CB(skb).portid); 75 } 76 77 return 0; 78 } 79 80 static const struct nla_policy tipc_nl_policy[TIPC_NLA_MAX + 1] = { 81 [TIPC_NLA_UNSPEC] = { .type = NLA_UNSPEC, }, 82 [TIPC_NLA_BEARER] = { .type = NLA_NESTED, }, 83 [TIPC_NLA_SOCK] = { .type = NLA_NESTED, }, 84 [TIPC_NLA_PUBL] = { .type = NLA_NESTED, }, 85 [TIPC_NLA_LINK] = { .type = NLA_NESTED, }, 86 [TIPC_NLA_MEDIA] = { .type = NLA_NESTED, }, 87 [TIPC_NLA_NODE] = { .type = NLA_NESTED, }, 88 [TIPC_NLA_NET] = { .type = NLA_NESTED, }, 89 [TIPC_NLA_NAME_TABLE] = { .type = NLA_NESTED, } 90 }; 91 92 /* Legacy ASCII API */ 93 static struct genl_family tipc_genl_family = { 94 .id = GENL_ID_GENERATE, 95 .name = TIPC_GENL_NAME, 96 .version = TIPC_GENL_VERSION, 97 .hdrsize = TIPC_GENL_HDRLEN, 98 .maxattr = 0, 99 .netnsok = true, 100 }; 101 102 /* Legacy ASCII API */ 103 static struct genl_ops tipc_genl_ops[] = { 104 { 105 .cmd = TIPC_GENL_CMD, 106 .doit = handle_cmd, 107 }, 108 }; 109 110 /* Users of the legacy API (tipc-config) can't handle that we add operations, 111 * so we have a separate genl handling for the new API. 112 */ 113 struct genl_family tipc_genl_v2_family = { 114 .id = GENL_ID_GENERATE, 115 .name = TIPC_GENL_V2_NAME, 116 .version = TIPC_GENL_V2_VERSION, 117 .hdrsize = 0, 118 .maxattr = TIPC_NLA_MAX, 119 .netnsok = true, 120 }; 121 122 static const struct genl_ops tipc_genl_v2_ops[] = { 123 { 124 .cmd = TIPC_NL_BEARER_DISABLE, 125 .doit = tipc_nl_bearer_disable, 126 .policy = tipc_nl_policy, 127 }, 128 { 129 .cmd = TIPC_NL_BEARER_ENABLE, 130 .doit = tipc_nl_bearer_enable, 131 .policy = tipc_nl_policy, 132 }, 133 { 134 .cmd = TIPC_NL_BEARER_GET, 135 .doit = tipc_nl_bearer_get, 136 .dumpit = tipc_nl_bearer_dump, 137 .policy = tipc_nl_policy, 138 }, 139 { 140 .cmd = TIPC_NL_BEARER_SET, 141 .doit = tipc_nl_bearer_set, 142 .policy = tipc_nl_policy, 143 }, 144 { 145 .cmd = TIPC_NL_SOCK_GET, 146 .dumpit = tipc_nl_sk_dump, 147 .policy = tipc_nl_policy, 148 }, 149 { 150 .cmd = TIPC_NL_PUBL_GET, 151 .dumpit = tipc_nl_publ_dump, 152 .policy = tipc_nl_policy, 153 }, 154 { 155 .cmd = TIPC_NL_LINK_GET, 156 .doit = tipc_nl_link_get, 157 .dumpit = tipc_nl_link_dump, 158 .policy = tipc_nl_policy, 159 }, 160 { 161 .cmd = TIPC_NL_LINK_SET, 162 .doit = tipc_nl_link_set, 163 .policy = tipc_nl_policy, 164 }, 165 { 166 .cmd = TIPC_NL_LINK_RESET_STATS, 167 .doit = tipc_nl_link_reset_stats, 168 .policy = tipc_nl_policy, 169 }, 170 { 171 .cmd = TIPC_NL_MEDIA_GET, 172 .doit = tipc_nl_media_get, 173 .dumpit = tipc_nl_media_dump, 174 .policy = tipc_nl_policy, 175 }, 176 { 177 .cmd = TIPC_NL_MEDIA_SET, 178 .doit = tipc_nl_media_set, 179 .policy = tipc_nl_policy, 180 }, 181 { 182 .cmd = TIPC_NL_NODE_GET, 183 .dumpit = tipc_nl_node_dump, 184 .policy = tipc_nl_policy, 185 }, 186 { 187 .cmd = TIPC_NL_NET_GET, 188 .dumpit = tipc_nl_net_dump, 189 .policy = tipc_nl_policy, 190 }, 191 { 192 .cmd = TIPC_NL_NET_SET, 193 .doit = tipc_nl_net_set, 194 .policy = tipc_nl_policy, 195 }, 196 { 197 .cmd = TIPC_NL_NAME_TABLE_GET, 198 .dumpit = tipc_nl_name_table_dump, 199 .policy = tipc_nl_policy, 200 } 201 }; 202 203 int tipc_nlmsg_parse(const struct nlmsghdr *nlh, struct nlattr ***attr) 204 { 205 u32 maxattr = tipc_genl_v2_family.maxattr; 206 207 *attr = tipc_genl_v2_family.attrbuf; 208 if (!*attr) 209 return -EOPNOTSUPP; 210 211 return nlmsg_parse(nlh, GENL_HDRLEN, *attr, maxattr, tipc_nl_policy); 212 } 213 214 int tipc_netlink_start(void) 215 { 216 int res; 217 218 res = genl_register_family_with_ops(&tipc_genl_family, tipc_genl_ops); 219 if (res) { 220 pr_err("Failed to register legacy interface\n"); 221 return res; 222 } 223 224 res = genl_register_family_with_ops(&tipc_genl_v2_family, 225 tipc_genl_v2_ops); 226 if (res) { 227 pr_err("Failed to register netlink interface\n"); 228 return res; 229 } 230 return 0; 231 } 232 233 void tipc_netlink_stop(void) 234 { 235 genl_unregister_family(&tipc_genl_family); 236 genl_unregister_family(&tipc_genl_v2_family); 237 } 238