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164 lines
3.9 KiB
164 lines
3.9 KiB
/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ |
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/* |
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* NETLINK Netlink attributes |
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* |
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* Copyright (c) 2003-2013 Thomas Graf <[email protected]> |
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*/ |
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#ifndef __LIBBPF_NLATTR_H |
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#define __LIBBPF_NLATTR_H |
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#include <stdint.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <linux/netlink.h> |
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#include <linux/rtnetlink.h> |
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/* avoid multiple definition of netlink features */ |
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#define __LINUX_NETLINK_H |
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/** |
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* Standard attribute types to specify validation policy |
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*/ |
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enum { |
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LIBBPF_NLA_UNSPEC, /**< Unspecified type, binary data chunk */ |
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LIBBPF_NLA_U8, /**< 8 bit integer */ |
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LIBBPF_NLA_U16, /**< 16 bit integer */ |
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LIBBPF_NLA_U32, /**< 32 bit integer */ |
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LIBBPF_NLA_U64, /**< 64 bit integer */ |
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LIBBPF_NLA_STRING, /**< NUL terminated character string */ |
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LIBBPF_NLA_FLAG, /**< Flag */ |
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LIBBPF_NLA_MSECS, /**< Micro seconds (64bit) */ |
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LIBBPF_NLA_NESTED, /**< Nested attributes */ |
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__LIBBPF_NLA_TYPE_MAX, |
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}; |
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#define LIBBPF_NLA_TYPE_MAX (__LIBBPF_NLA_TYPE_MAX - 1) |
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/** |
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* @ingroup attr |
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* Attribute validation policy. |
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* |
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* See section @core_doc{core_attr_parse,Attribute Parsing} for more details. |
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*/ |
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struct libbpf_nla_policy { |
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/** Type of attribute or LIBBPF_NLA_UNSPEC */ |
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uint16_t type; |
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/** Minimal length of payload required */ |
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uint16_t minlen; |
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/** Maximal length of payload allowed */ |
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uint16_t maxlen; |
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}; |
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struct libbpf_nla_req { |
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struct nlmsghdr nh; |
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union { |
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struct ifinfomsg ifinfo; |
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struct tcmsg tc; |
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}; |
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char buf[128]; |
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}; |
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/** |
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* @ingroup attr |
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* Iterate over a stream of attributes |
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* @arg pos loop counter, set to current attribute |
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* @arg head head of attribute stream |
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* @arg len length of attribute stream |
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* @arg rem initialized to len, holds bytes currently remaining in stream |
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*/ |
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#define libbpf_nla_for_each_attr(pos, head, len, rem) \ |
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for (pos = head, rem = len; \ |
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nla_ok(pos, rem); \ |
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pos = nla_next(pos, &(rem))) |
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/** |
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* libbpf_nla_data - head of payload |
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* @nla: netlink attribute |
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*/ |
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static inline void *libbpf_nla_data(const struct nlattr *nla) |
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{ |
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return (void *)nla + NLA_HDRLEN; |
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} |
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static inline uint8_t libbpf_nla_getattr_u8(const struct nlattr *nla) |
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{ |
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return *(uint8_t *)libbpf_nla_data(nla); |
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} |
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static inline uint32_t libbpf_nla_getattr_u32(const struct nlattr *nla) |
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{ |
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return *(uint32_t *)libbpf_nla_data(nla); |
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} |
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static inline const char *libbpf_nla_getattr_str(const struct nlattr *nla) |
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{ |
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return (const char *)libbpf_nla_data(nla); |
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} |
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/** |
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* libbpf_nla_len - length of payload |
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* @nla: netlink attribute |
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*/ |
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static inline int libbpf_nla_len(const struct nlattr *nla) |
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{ |
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return nla->nla_len - NLA_HDRLEN; |
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} |
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int libbpf_nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head, |
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int len, struct libbpf_nla_policy *policy); |
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int libbpf_nla_parse_nested(struct nlattr *tb[], int maxtype, |
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struct nlattr *nla, |
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struct libbpf_nla_policy *policy); |
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int libbpf_nla_dump_errormsg(struct nlmsghdr *nlh); |
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static inline struct nlattr *nla_data(struct nlattr *nla) |
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{ |
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return (struct nlattr *)((void *)nla + NLA_HDRLEN); |
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} |
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static inline struct nlattr *req_tail(struct libbpf_nla_req *req) |
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{ |
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return (struct nlattr *)((void *)req + NLMSG_ALIGN(req->nh.nlmsg_len)); |
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} |
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static inline int nlattr_add(struct libbpf_nla_req *req, int type, |
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const void *data, int len) |
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{ |
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struct nlattr *nla; |
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if (NLMSG_ALIGN(req->nh.nlmsg_len) + NLA_ALIGN(NLA_HDRLEN + len) > sizeof(*req)) |
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return -EMSGSIZE; |
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if (!!data != !!len) |
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return -EINVAL; |
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nla = req_tail(req); |
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nla->nla_type = type; |
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nla->nla_len = NLA_HDRLEN + len; |
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if (data) |
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memcpy(nla_data(nla), data, len); |
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req->nh.nlmsg_len = NLMSG_ALIGN(req->nh.nlmsg_len) + NLA_ALIGN(nla->nla_len); |
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return 0; |
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} |
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static inline struct nlattr *nlattr_begin_nested(struct libbpf_nla_req *req, int type) |
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{ |
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struct nlattr *tail; |
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tail = req_tail(req); |
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if (nlattr_add(req, type | NLA_F_NESTED, NULL, 0)) |
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return NULL; |
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return tail; |
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} |
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static inline void nlattr_end_nested(struct libbpf_nla_req *req, |
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struct nlattr *tail) |
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{ |
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tail->nla_len = (void *)req_tail(req) - (void *)tail; |
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} |
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#endif /* __LIBBPF_NLATTR_H */
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