strace/tests/nlattr_tcmsg.c

/*
 * Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
 * Copyright (c) 2017 The strace developers.
 * 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 "tests.h"

#include <stdio.h>
#include <stddef.h>
#include "test_nlattr.h"
#include <linux/pkt_sched.h>
#include <linux/rtnetlink.h>

static void
init_tcmsg(struct nlmsghdr *const nlh, const unsigned int msg_len)
{
	SET_STRUCT(struct nlmsghdr, nlh,
		.nlmsg_len = msg_len,
		.nlmsg_type = RTM_GETQDISC,
		.nlmsg_flags = NLM_F_DUMP
	);

	struct tcmsg *const msg = NLMSG_DATA(nlh);
	SET_STRUCT(struct tcmsg, msg,
		.tcm_family = AF_UNIX,
		.tcm_ifindex = ifindex_lo()
	);

}

static void
print_tcmsg(const unsigned int msg_len)
{
	printf("{len=%u, type=RTM_GETQDISC, flags=NLM_F_DUMP"
	       ", seq=0, pid=0}, {tcm_family=AF_UNIX"
	       ", tcm_ifindex=" IFINDEX_LO_STR
	       ", tcm_handle=0, tcm_parent=0, tcm_info=0}",
	       msg_len);
}

int
main(void)
{
	skip_if_unavailable("/proc/self/fd/");

	const int fd = create_nl_socket(NETLINK_ROUTE);
	const unsigned int hdrlen = sizeof(struct tcmsg);
	void *nlh0 = tail_alloc(NLMSG_SPACE(hdrlen));

	static char pattern[4096];
	fill_memory_ex(pattern, sizeof(pattern), 'a', 'z' - 'a' + 1);

	const unsigned int nla_type = 0xffff & NLA_TYPE_MASK;
	char nla_type_str[256];
	sprintf(nla_type_str, "%#x /* TCA_??? */", nla_type);
	TEST_NLATTR_(fd, nlh0, hdrlen,
		     init_tcmsg, print_tcmsg,
		     nla_type, nla_type_str,
		     4, pattern, 4,
		     print_quoted_hex(pattern, 4));

	static const struct tc_stats st = {
		.bytes = 0xabcdcdbefeadefac,
		.packets = 0xbcdeaefd,
		.drops = 0xcdedafed,
		.overlimits = 0xdcdbefad,
		.bps = 0xefaebfad,
		.pps = 0xfefbaedb,
		.qlen = 0xabcdefab,
		.backlog = 0xbdeabeab
	};
	char buf[offsetofend(struct tc_stats, backlog)];
	memcpy(buf, &st, sizeof(buf));
	TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
			   init_tcmsg, print_tcmsg,
			   TCA_STATS, pattern, buf,
			   PRINT_FIELD_U("{", st, bytes);
			   PRINT_FIELD_U(", ", st, packets);
			   PRINT_FIELD_U(", ", st, drops);
			   PRINT_FIELD_U(", ", st, overlimits);
			   PRINT_FIELD_U(", ", st, bps);
			   PRINT_FIELD_U(", ", st, pps);
			   PRINT_FIELD_U(", ", st, qlen);
			   PRINT_FIELD_U(", ", st, backlog);
			   printf("}"));

	static const struct tc_estimator est = {
		.interval = 0xcd,
		.ewma_log = 0xab
	};
	TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
			   init_tcmsg, print_tcmsg,
			   TCA_RATE, pattern, est,
			   PRINT_FIELD_D("{", est, interval);
			   PRINT_FIELD_U(", ", est, ewma_log);
			   printf("}"));

	puts("+++ exited with 0 +++");
	return 0;
}