netlink.c

/*
 * Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "defs.h"
#include <sys/socket.h>
#include <linux/netlink.h>
#include "xlat/netlink_flags.h"
#include "xlat/netlink_types.h"

void
decode_netlink(struct tcb *tcp, unsigned long addr, unsigned long size)
{
	struct nlmsghdr nlmsghdr;

	if (size < sizeof(struct nlmsghdr)) {
		printstr(tcp, addr, size);
		return;
	}
	if (umove_or_printaddr(tcp, addr, &nlmsghdr))
		return;

	tprintf("{{len=%u, type=", nlmsghdr.nlmsg_len);

	printxval(netlink_types, nlmsghdr.nlmsg_type, "NLMSG_???");

	tprints(", flags=");
	printflags(netlink_flags, nlmsghdr.nlmsg_flags, "NLM_F_???");
	/* manage get/new requests */

	tprintf(", seq=%u, pid=%u}", nlmsghdr.nlmsg_seq,
		nlmsghdr.nlmsg_pid);

	if (size - sizeof(struct nlmsghdr) > 0) {
		tprints(", ");
		printstr(tcp, addr + sizeof(struct nlmsghdr),
			 size - sizeof(struct nlmsghdr));
	}

	tprints("}");
}