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1bc38b8ff6
libbpf is maturing as a library and gaining features that no other bpf libraries support (BPF Type Format, bpf to bpf calls, etc) Many Apache2 licensed projects (like bcc, bpftrace, gobpf, cilium, etc) would like to use libbpf, but cannot do this yet, since Apache Foundation explicitly states that LGPL is incompatible with Apache2. Hence let's relicense libbpf as dual license LGPL-2.1 or BSD-2-Clause, since BSD-2 is compatible with Apache2. Dual LGPL or Apache2 is invalid combination. Fix license mistake in Makefile as well. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrey Ignatov <rdna@fb.com> Acked-by: Arnaldo Carvalho de Melo <acme@kernel.org> Acked-by: Björn Töpel <bjorn.topel@intel.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: David Beckett <david.beckett@netronome.com> Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Joe Stringer <joe@ovn.org> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Quentin Monnet <quentin.monnet@netronome.com> Acked-by: Thomas Graf <tgraf@suug.ch> Acked-by: Roman Gushchin <guro@fb.com> Acked-by: Wang Nan <wangnan0@huawei.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
107 lines
2.7 KiB
C
107 lines
2.7 KiB
C
/* 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 <tgraf@suug.ch>
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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 <linux/netlink.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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/**
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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 (char *) 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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#endif /* __LIBBPF_NLATTR_H */
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