| Thomas Graf | a7469ce | 2008-01-08 15:00:46 +0100 | [diff] [blame] | 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@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 nl_error(EINVAL, "No name specified"); |
| 65 | |
| 66 | if (rtnl_link_info_ops_lookup(ops->io_name)) |
| 67 | return nl_error(EEXIST, "Link info operations already 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 nl_error(ENOENT, "No such link info operations"); |
| 87 | |
| 88 | if (t->io_refcnt > 0) |
| 89 | return nl_error(EBUSY, "Info operations in use"); |
| 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 | |