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