| Eric Leblond | bbf48c1 | 2018-01-30 21:55:02 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: LGPL-2.1 */ |
| 2 | |
| 3 | /* |
| 4 | * NETLINK Netlink attributes |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation version 2.1 |
| 9 | * of the License. |
| 10 | * |
| 11 | * Copyright (c) 2003-2013 Thomas Graf <tgraf@suug.ch> |
| 12 | */ |
| 13 | |
| 14 | #ifndef __NLATTR_H |
| 15 | #define __NLATTR_H |
| 16 | |
| 17 | #include <stdint.h> |
| 18 | #include <linux/netlink.h> |
| 19 | /* avoid multiple definition of netlink features */ |
| 20 | #define __LINUX_NETLINK_H |
| 21 | |
| 22 | /** |
| 23 | * Standard attribute types to specify validation policy |
| 24 | */ |
| 25 | enum { |
| 26 | NLA_UNSPEC, /**< Unspecified type, binary data chunk */ |
| 27 | NLA_U8, /**< 8 bit integer */ |
| 28 | NLA_U16, /**< 16 bit integer */ |
| 29 | NLA_U32, /**< 32 bit integer */ |
| 30 | NLA_U64, /**< 64 bit integer */ |
| 31 | NLA_STRING, /**< NUL terminated character string */ |
| 32 | NLA_FLAG, /**< Flag */ |
| 33 | NLA_MSECS, /**< Micro seconds (64bit) */ |
| 34 | NLA_NESTED, /**< Nested attributes */ |
| 35 | __NLA_TYPE_MAX, |
| 36 | }; |
| 37 | |
| 38 | #define NLA_TYPE_MAX (__NLA_TYPE_MAX - 1) |
| 39 | |
| 40 | /** |
| 41 | * @ingroup attr |
| 42 | * Attribute validation policy. |
| 43 | * |
| 44 | * See section @core_doc{core_attr_parse,Attribute Parsing} for more details. |
| 45 | */ |
| 46 | struct nla_policy { |
| 47 | /** Type of attribute or NLA_UNSPEC */ |
| 48 | uint16_t type; |
| 49 | |
| 50 | /** Minimal length of payload required */ |
| 51 | uint16_t minlen; |
| 52 | |
| 53 | /** Maximal length of payload allowed */ |
| 54 | uint16_t maxlen; |
| 55 | }; |
| 56 | |
| 57 | /** |
| 58 | * @ingroup attr |
| 59 | * Iterate over a stream of attributes |
| 60 | * @arg pos loop counter, set to current attribute |
| 61 | * @arg head head of attribute stream |
| 62 | * @arg len length of attribute stream |
| 63 | * @arg rem initialized to len, holds bytes currently remaining in stream |
| 64 | */ |
| 65 | #define nla_for_each_attr(pos, head, len, rem) \ |
| 66 | for (pos = head, rem = len; \ |
| 67 | nla_ok(pos, rem); \ |
| 68 | pos = nla_next(pos, &(rem))) |
| 69 | |
| 70 | int nla_dump_errormsg(struct nlmsghdr *nlh); |
| 71 | |
| 72 | #endif /* __NLATTR_H */ |