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