1 /* 2 * lib/route/link/api.c Link Info API 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation version 2.1 7 * of the License. 8 * 9 * Copyright (c) 2003-2008 Thomas Graf <tgraf (at) suug.ch> 10 */ 11 12 /** 13 * @ingroup link 14 * @defgroup link_info Link Info API 15 * @brief 16 * 17 * @par 1) Registering/Unregistering a new link info type 18 * @code 19 * static struct rtnl_link_info_ops vlan_info_ops = { 20 * .io_name = "vlan", 21 * .io_alloc = vlan_alloc, 22 * .io_parse = vlan_parse, 23 * .io_dump[NL_DUMP_BRIEF] = vlan_dump_brief, 24 * .io_dump[NL_DUMP_FULL] = vlan_dump_full, 25 * .io_free = vlan_free, 26 * }; 27 * 28 * static void __init vlan_init(void) 29 * { 30 * rtnl_link_register_info(&vlan_info_ops); 31 * } 32 * 33 * static void __exit vlan_exit(void) 34 * { 35 * rtnl_link_unregister_info(&vlan_info_ops); 36 * } 37 * @endcode 38 * 39 * @{ 40 */ 41 42 #include <netlink-local.h> 43 #include <netlink/netlink.h> 44 #include <netlink/utils.h> 45 #include <netlink/route/link.h> 46 #include <netlink/route/link/info-api.h> 47 48 static struct rtnl_link_info_ops *info_ops; 49 50 struct rtnl_link_info_ops *rtnl_link_info_ops_lookup(const char *name) 51 { 52 struct rtnl_link_info_ops *ops; 53 54 for (ops = info_ops; ops; ops = ops->io_next) 55 if (!strcmp(ops->io_name, name)) 56 return ops; 57 58 return NULL; 59 } 60 61 int rtnl_link_register_info(struct rtnl_link_info_ops *ops) 62 { 63 if (ops->io_name == NULL) 64 return -NLE_INVAL; 65 66 if (rtnl_link_info_ops_lookup(ops->io_name)) 67 return -NLE_EXIST; 68 69 NL_DBG(1, "Registered link info operations %s\n", ops->io_name); 70 71 ops->io_next = info_ops; 72 info_ops = ops; 73 74 return 0; 75 } 76 77 int rtnl_link_unregister_info(struct rtnl_link_info_ops *ops) 78 { 79 struct rtnl_link_info_ops *t, **tp; 80 81 for (tp = &info_ops; (t=*tp) != NULL; tp = &t->io_next) 82 if (t == ops) 83 break; 84 85 if (!t) 86 return -NLE_OPNOTSUPP; 87 88 if (t->io_refcnt > 0) 89 return -NLE_BUSY; 90 91 NL_DBG(1, "Unregistered link info perations %s\n", ops->io_name); 92 93 *tp = t->io_next; 94 return 0; 95 } 96 97 /** @} */ 98 99
