githubmirror/strace

src/rtnl_addrlabel.c
73 строки2 KB
Dmitry V. Levin
rtnl_addrlabel: use print_fields.h helpers
08 май 2021, 12:00
08 май 2021, 12:00e225c42
/*
 * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
 * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
 * Copyright (c) 2016-2021 The strace developers.
 * All rights reserved.
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 */

#include "defs.h"

#include "netlink_route.h"
#include "nlattr.h"

#include <linux/if_addrlabel.h>
#include "netlink.h"

#include "xlat/rtnl_addrlabel_attrs.h"

static bool
decode_ifal_address(struct tcb *const tcp,
		    const kernel_ulong_t addr,
		    const unsigned int len,
		    const void *const opaque_data)
{
	const struct ifaddrlblmsg *const ifal = opaque_data;

	decode_inet_addr(tcp, addr, len, ifal->ifal_family, NULL);

	return true;
}

static const nla_decoder_t ifaddrlblmsg_nla_decoders[] = {
	[IFAL_ADDRESS]	= decode_ifal_address,
	[IFAL_LABEL]	= decode_nla_u32
};

DECL_NETLINK_ROUTE_DECODER(decode_ifaddrlblmsg)
{
	struct ifaddrlblmsg ifal = { .ifal_family = family };
	size_t offset = sizeof(ifal.ifal_family);
	bool decode_nla = false;

	tprint_struct_begin();
	PRINT_FIELD_XVAL(ifal, ifal_family, addrfams, "AF_???");
	tprint_struct_next();

	if (len >= sizeof(ifal)) {
		if (!umoven_or_printaddr(tcp, addr + offset,
					 sizeof(ifal) - offset,
					 (char *) &ifal + offset)) {
			PRINT_FIELD_U(ifal, ifal_prefixlen);
			tprint_struct_next();
			PRINT_FIELD_U(ifal, ifal_flags);
			tprint_struct_next();
			PRINT_FIELD_IFINDEX(ifal, ifal_index);
			tprint_struct_next();
			PRINT_FIELD_U(ifal, ifal_seq);
			decode_nla = true;
		}
	} else
		tprint_more_data_follows();
	tprint_struct_end();

	offset = NLMSG_ALIGN(sizeof(ifal));
	if (decode_nla && len > offset) {
		tprint_array_next();
		decode_nlattr(tcp, addr + offset, len - offset,
			      rtnl_addrlabel_attrs, "IFAL_???",
			      ifaddrlblmsg_nla_decoders,
			      ARRAY_SIZE(ifaddrlblmsg_nla_decoders), &ifal);
	}
}