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