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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>
 */

#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <linux/rtnetlink.h>
#include "nlattr.h"
#include "libbpf_internal.h"

static uint16_t nla_attr_minlen[LIBBPF_NLA_TYPE_MAX+1] = {
	[LIBBPF_NLA_U8]		= sizeof(uint8_t),
	[LIBBPF_NLA_U16]	= sizeof(uint16_t),
	[LIBBPF_NLA_U32]	= sizeof(uint32_t),
	[LIBBPF_NLA_U64]	= sizeof(uint64_t),
	[LIBBPF_NLA_STRING]	= 1,
	[LIBBPF_NLA_FLAG]	= 0,
};

static struct nlattr *nla_next(const struct nlattr *nla, int *remaining)
{
	int totlen = NLA_ALIGN(nla->nla_len);

	*remaining -= totlen;
	return (struct nlattr *)((void *)nla + totlen);
}

static int nla_ok(const struct nlattr *nla, int remaining)
{
	return remaining >= (int)sizeof(*nla) &&
	       nla->nla_len >= sizeof(*nla) &&
	       nla->nla_len <= remaining;
}

static int nla_type(const struct nlattr *nla)
{
	return nla->nla_type & NLA_TYPE_MASK;
}

static int validate_nla(struct nlattr *nla, int maxtype,
			struct libbpf_nla_policy *policy)
{
	struct libbpf_nla_policy *pt;
	unsigned int minlen = 0;
	int type = nla_type(nla);

	if (type < 0 || type > maxtype)
		return 0;

	pt = &policy[type];

	if (pt->type > LIBBPF_NLA_TYPE_MAX)
		return 0;

	if (pt->minlen)
		minlen = pt->minlen;
	else if (pt->type != LIBBPF_NLA_UNSPEC)
		minlen = nla_attr_minlen[pt->type];

	if (libbpf_nla_len(nla) < minlen)
		return -1;

	if (pt->maxlen && libbpf_nla_len(nla) > pt->maxlen)
		return -1;

	if (pt->type == LIBBPF_NLA_STRING) {
		char *data = libbpf_nla_data(nla);

		if (data[libbpf_nla_len(nla) - 1] != '\0')
			return -1;
	}

	return 0;
}

static inline int nlmsg_len(const struct nlmsghdr *nlh)
{
	return nlh->nlmsg_len - NLMSG_HDRLEN;
}

/**
 * Create attribute index based on a stream of attributes.
 * @arg tb		Index array to be filled (maxtype+1 elements).
 * @arg maxtype		Maximum attribute type expected and accepted.
 * @arg head		Head of attribute stream.
 * @arg len		Length of attribute stream.
 * @arg policy		Attribute validation policy.
 *
 * Iterates over the stream of attributes and stores a pointer to each
 * attribute in the index array using the attribute type as index to
 * the array. Attribute with a type greater than the maximum type
 * specified will be silently ignored in order to maintain backwards
 * compatibility. If \a policy is not NULL, the attribute will be
 * validated using the specified policy.
 *
 * @see nla_validate
 * @return 0 on success or a negative error code.
 */
int libbpf_nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head,
		     int len, struct libbpf_nla_policy *policy)
{
	struct nlattr *nla;
	int rem, err;

	memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));

	libbpf_nla_for_each_attr(nla, head, len, rem) {
		int type = nla_type(nla);

		if (type > maxtype)
			continue;

		if (policy) {
			err = validate_nla(nla, maxtype, policy);
			if (err < 0)
				goto errout;
		}

		if (tb[type])
			pr_warn("Attribute of type %#x found multiple times in message, "
				"previous attribute is being ignored.\n", type);

		tb[type] = nla;
	}

	err = 0;
errout:
	return err;
}

/**
 * Create attribute index based on nested attribute
 * @arg tb              Index array to be filled (maxtype+1 elements).
 * @arg maxtype         Maximum attribute type expected and accepted.
 * @arg nla             Nested Attribute.
 * @arg policy          Attribute validation policy.
 *
 * Feeds the stream of attributes nested into the specified attribute
 * to libbpf_nla_parse().
 *
 * @see libbpf_nla_parse
 * @return 0 on success or a negative error code.
 */
int libbpf_nla_parse_nested(struct nlattr *tb[], int maxtype,
			    struct nlattr *nla,
			    struct libbpf_nla_policy *policy)
{
	return libbpf_nla_parse(tb, maxtype, libbpf_nla_data(nla),
				libbpf_nla_len(nla), policy);
}

/* dump netlink extended ack error message */
int libbpf_nla_dump_errormsg(struct nlmsghdr *nlh)
{
	struct libbpf_nla_policy extack_policy[NLMSGERR_ATTR_MAX + 1] = {
		[NLMSGERR_ATTR_MSG]	= { .type = LIBBPF_NLA_STRING },
		[NLMSGERR_ATTR_OFFS]	= { .type = LIBBPF_NLA_U32 },
	};
	struct nlattr *tb[NLMSGERR_ATTR_MAX + 1], *attr;
	struct nlmsgerr *err;
	char *errmsg = NULL;
	int hlen, alen;

	/* no TLVs, nothing to do here */
	if (!(nlh->nlmsg_flags & NLM_F_ACK_TLVS))
		return 0;

	err = (struct nlmsgerr *)NLMSG_DATA(nlh);
	hlen = sizeof(*err);

	/* if NLM_F_CAPPED is set then the inner err msg was capped */
	if (!(nlh->nlmsg_flags & NLM_F_CAPPED))
		hlen += nlmsg_len(&err->msg);

	attr = (struct nlattr *) ((void *) err + hlen);
	alen = (void *)nlh + nlh->nlmsg_len - (void *)attr;

	if (libbpf_nla_parse(tb, NLMSGERR_ATTR_MAX, attr, alen,
			     extack_policy) != 0) {
		pr_warn("Failed to parse extended error attributes\n");
		return 0;
	}

	if (tb[NLMSGERR_ATTR_MSG])
		errmsg = (char *) libbpf_nla_data(tb[NLMSGERR_ATTR_MSG]);

	pr_warn("Kernel error message: %s\n", errmsg);

	return 0;
}

Filemanager

DIR : / usr/ src/ kernels/ 5.14.0-611.49.2.el9_7.x86_64/ tools/ lib/ bpf/
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