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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/tools/lib/bpf/nlattr.h
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..
@@ -1,18 +1,13 @@
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-/* SPDX-License-Identifier: LGPL-2.1 */
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+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
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2
 
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 /*
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  * NETLINK      Netlink attributes
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  *
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- *	This library is free software; you can redistribute it and/or
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- *	modify it under the terms of the GNU Lesser General Public
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- *	License as published by the Free Software Foundation version 2.1
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- *	of the License.
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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 __NLATTR_H
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-#define __NLATTR_H
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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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@@ -23,19 +18,19 @@
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  * Standard attribute types to specify validation policy
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  */
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 enum {
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-	NLA_UNSPEC,	/**< Unspecified type, binary data chunk */
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-	NLA_U8,		/**< 8 bit integer */
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-	NLA_U16,	/**< 16 bit integer */
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-	NLA_U32,	/**< 32 bit integer */
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-	NLA_U64,	/**< 64 bit integer */
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-	NLA_STRING,	/**< NUL terminated character string */
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-	NLA_FLAG,	/**< Flag */
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-	NLA_MSECS,	/**< Micro seconds (64bit) */
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-	NLA_NESTED,	/**< Nested attributes */
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-	__NLA_TYPE_MAX,
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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 NLA_TYPE_MAX (__NLA_TYPE_MAX - 1)
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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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@@ -43,8 +38,8 @@
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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 nla_policy {
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-	/** Type of attribute or NLA_UNSPEC */
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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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@@ -62,11 +57,50 @@
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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 nla_for_each_attr(pos, head, len, rem) \
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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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64
 
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-int nla_dump_errormsg(struct nlmsghdr *nlh);
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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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-#endif /* __NLATTR_H */
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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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+
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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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+
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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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+/**
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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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+
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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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+
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+int libbpf_nla_dump_errormsg(struct nlmsghdr *nlh);
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+
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+#endif /* __LIBBPF_NLATTR_H */