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