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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 */
| 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 |
|