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/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */

/*
 * NETLINK      Netlink attributes
 *
 * Copyright (c) 2003-2013 Thomas Graf <tgraf@suug.ch>
 */

#ifndef __LIBBPF_NLATTR_H
#define __LIBBPF_NLATTR_H

#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/genetlink.h>

/* avoid multiple definition of netlink features */
#define __LINUX_NETLINK_H

/**
 * Standard attribute types to specify validation policy
 */
enum {
	LIBBPF_NLA_UNSPEC,	/**< Unspecified type, binary data chunk */
	LIBBPF_NLA_U8,		/**< 8 bit integer */
	LIBBPF_NLA_U16,		/**< 16 bit integer */
	LIBBPF_NLA_U32,		/**< 32 bit integer */
	LIBBPF_NLA_U64,		/**< 64 bit integer */
	LIBBPF_NLA_STRING,	/**< NUL terminated character string */
	LIBBPF_NLA_FLAG,	/**< Flag */
	LIBBPF_NLA_MSECS,	/**< Micro seconds (64bit) */
	LIBBPF_NLA_NESTED,	/**< Nested attributes */
	__LIBBPF_NLA_TYPE_MAX,
};

#define LIBBPF_NLA_TYPE_MAX (__LIBBPF_NLA_TYPE_MAX - 1)

/**
 * @ingroup attr
 * Attribute validation policy.
 *
 * See section @core_doc{core_attr_parse,Attribute Parsing} for more details.
 */
struct libbpf_nla_policy {
	/** Type of attribute or LIBBPF_NLA_UNSPEC */
	uint16_t	type;

	/** Minimal length of payload required */
	uint16_t	minlen;

	/** Maximal length of payload allowed */
	uint16_t	maxlen;
};

struct libbpf_nla_req {
	struct nlmsghdr nh;
	union {
		struct ifinfomsg ifinfo;
		struct tcmsg tc;
		struct genlmsghdr gnl;
	};
	char buf[128];
};

/**
 * @ingroup attr
 * Iterate over a stream of attributes
 * @arg pos	loop counter, set to current attribute
 * @arg head	head of attribute stream
 * @arg len	length of attribute stream
 * @arg rem	initialized to len, holds bytes currently remaining in stream
 */
#define libbpf_nla_for_each_attr(pos, head, len, rem) \
	for (pos = head, rem = len; \
	     nla_ok(pos, rem); \
	     pos = nla_next(pos, &(rem)))

/**
 * libbpf_nla_data - head of payload
 * @nla: netlink attribute
 */
static inline void *libbpf_nla_data(const struct nlattr *nla)
{
	return (void *)nla + NLA_HDRLEN;
}

static inline uint8_t libbpf_nla_getattr_u8(const struct nlattr *nla)
{
	return *(uint8_t *)libbpf_nla_data(nla);
}

static inline uint16_t libbpf_nla_getattr_u16(const struct nlattr *nla)
{
	return *(uint16_t *)libbpf_nla_data(nla);
}

static inline uint32_t libbpf_nla_getattr_u32(const struct nlattr *nla)
{
	return *(uint32_t *)libbpf_nla_data(nla);
}

static inline uint64_t libbpf_nla_getattr_u64(const struct nlattr *nla)
{
	return *(uint64_t *)libbpf_nla_data(nla);
}

static inline const char *libbpf_nla_getattr_str(const struct nlattr *nla)
{
	return (const char *)libbpf_nla_data(nla);
}

/**
 * libbpf_nla_len - length of payload
 * @nla: netlink attribute
 */
static inline int libbpf_nla_len(const struct nlattr *nla)
{
	return nla->nla_len - NLA_HDRLEN;
}

int libbpf_nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head,
		     int len, struct libbpf_nla_policy *policy);
int libbpf_nla_parse_nested(struct nlattr *tb[], int maxtype,
			    struct nlattr *nla,
			    struct libbpf_nla_policy *policy);

int libbpf_nla_dump_errormsg(struct nlmsghdr *nlh);

static inline struct nlattr *nla_data(struct nlattr *nla)
{
	return (struct nlattr *)((void *)nla + NLA_HDRLEN);
}

static inline struct nlattr *req_tail(struct libbpf_nla_req *req)
{
	return (struct nlattr *)((void *)req + NLMSG_ALIGN(req->nh.nlmsg_len));
}

static inline int nlattr_add(struct libbpf_nla_req *req, int type,
			     const void *data, int len)
{
	struct nlattr *nla;

	if (NLMSG_ALIGN(req->nh.nlmsg_len) + NLA_ALIGN(NLA_HDRLEN + len) > sizeof(*req))
		return -EMSGSIZE;
	if (!!data != !!len)
		return -EINVAL;

	nla = req_tail(req);
	nla->nla_type = type;
	nla->nla_len = NLA_HDRLEN + len;
	if (data)
		memcpy(nla_data(nla), data, len);
	req->nh.nlmsg_len = NLMSG_ALIGN(req->nh.nlmsg_len) + NLA_ALIGN(nla->nla_len);
	return 0;
}

static inline struct nlattr *nlattr_begin_nested(struct libbpf_nla_req *req, int type)
{
	struct nlattr *tail;

	tail = req_tail(req);
	if (nlattr_add(req, type | NLA_F_NESTED, NULL, 0))
		return NULL;
	return tail;
}

static inline void nlattr_end_nested(struct libbpf_nla_req *req,
				     struct nlattr *tail)
{
	tail->nla_len = (void *)req_tail(req) - (void *)tail;
}

#endif /* __LIBBPF_NLATTR_H */

Filemanager

Name Type Size Permission Actions
Build File 263 B 0644
Makefile File 10.9 KB 0644
bpf.c File 36.63 KB 0644
bpf.h File 24.87 KB 0644
bpf_core_read.h File 21.89 KB 0644
bpf_endian.h File 3.66 KB 0644
bpf_gen_internal.h File 2.17 KB 0644
bpf_helpers.h File 15.51 KB 0644
bpf_prog_linfo.c File 6.14 KB 0644
bpf_tracing.h File 32.87 KB 0644
btf.c File 142.89 KB 0644
btf.h File 19.99 KB 0644
btf_dump.c File 69.04 KB 0644
btf_iter.c File 4.05 KB 0644
btf_relocate.c File 14.32 KB 0644
elf.c File 13.48 KB 0644
features.c File 17.16 KB 0644
gen_loader.c File 37.52 KB 0644
hashmap.c File 4.92 KB 0644
hashmap.h File 6.74 KB 0644
libbpf.c File 375.66 KB 0644
libbpf.h File 73.26 KB 0644
libbpf.map File 8.86 KB 0644
libbpf.pc.template File 252 B 0644
libbpf_common.h File 3.36 KB 0644
libbpf_errno.c File 2.25 KB 0644
libbpf_internal.h File 19.59 KB 0644
libbpf_legacy.h File 5.07 KB 0644
libbpf_probes.c File 11.87 KB 0644
libbpf_version.h File 242 B 0644
linker.c File 76.81 KB 0644
netlink.c File 21.65 KB 0644
nlattr.c File 4.9 KB 0644
nlattr.h File 4.23 KB 0644
relo_core.c File 50.5 KB 0644
relo_core.h File 3.26 KB 0644
ringbuf.c File 15.86 KB 0644
skel_internal.h File 8.89 KB 0644
str_error.c File 1020 B 0644
str_error.h File 235 B 0644
strset.c File 4.28 KB 0644
strset.h File 586 B 0644
usdt.bpf.h File 8.31 KB 0644
usdt.c File 51.09 KB 0644
zip.c File 8.29 KB 0644
zip.h File 1.24 KB 0644