symon/symon/platform/OpenBSD/sm_pfq.c

/* $Id: sm_pfq.c,v 1.1 2005/03/20 16:17:22 dijkstra Exp $ */

/*
 * Copyright (c) 2005 J. Martin Petersen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    - Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    - 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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
 * COPYRIGHT HOLDERS OR CONTRIBUTORS 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.
 *
 */

/*
 * Get current altq statistics from pf and return them in symon_buf as
 * sent_bytes : sent_packets : drop_bytes : drop_packets
 *
 * Non re-entrant code: gets_pfq messes with the globals without locking.
 */

#include "conf.h"

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>

#ifdef HAS_PFVAR_H
#include <net/pfvar.h>
#include <altq/altq.h>
#include <altq/altq_cbq.h>
#include <altq/altq_priq.h>
#include <altq/altq_hfsc.h>
#endif

#include <errno.h>
#include <string.h>
#include <fcntl.h>

#include "error.h"
#include "symon.h"
#include "xmalloc.h"

#ifndef HAS_PFVAR_H
void
privinit_pfq()
{
    fatal("pf support not available");
}
void
init_pfq(char *s)
{
    fatal("pf support not available");
}
void
gets_pfq()
{
    fatal("pf support not available");
}

int
get_pfq(char *b, int l, char *s)
{
  fatal("pf support not available");
  return 0;
}

#else

union class_stats {
    class_stats_t cbq;
    struct priq_classstats priq;
    struct hfsc_classstats hfsc;
};

/*
 * We don't reuse the data structures from altq/altq_{cbq|hfsc|priq}.h as they
 * are overly complex. For now we only grab the interesting stuff.
 */

struct altq_stats {
    char qname[PF_QNAME_SIZE];
    u_int64_t sent_bytes;
    u_int64_t sent_packets;
    u_int64_t drop_bytes;
    u_int64_t drop_packets;
};

static struct altq_stats *pfq_stats = NULL;
static int pfq_numstats = 0;
int pfq_dev = -1;

void
privinit_pfq()
{
    if ((pfq_dev = open("/dev/pf", O_RDONLY)) == -1) {
	warning("pfq: could not open \"/dev/pf\", %.200s", strerror(errno));
    }
}

void
init_pfq(char *s)
{
    if (pfq_dev == -1) {
	privinit_pfq();
    }

    info("started module pfq(%.200s)",s);
}

void
gets_pfq()
{
    struct pfioc_altq qs;
    struct pfioc_qstats stats;
    union class_stats q;
    unsigned int nqs;
    unsigned int i;

    bzero(&qs, sizeof(qs));
    bzero(&stats, sizeof(stats));
    bzero(&q, sizeof(q));

    if (ioctl(pfq_dev, DIOCGETALTQS, &qs)) {
	fatal("pfq: DIOCGETALTQS failed");
    }
    nqs = qs.nr;

    /* Allocate memory for info for the nqs queues */
    if (nqs > pfq_numstats) {
	if (pfq_stats) {
	    xfree(pfq_stats);
	}

	pfq_stats = xmalloc(nqs * sizeof(struct altq_stats));
	pfq_numstats = nqs;
    }

    /* Loop through the queues, copy info */
    for (i = 0; i < nqs; i++) {
	qs.nr = i;
	if (ioctl(pfq_dev, DIOCGETALTQ, &qs)) {
	    fatal("pfq: DIOCGETALTQ failed");
	}

	/* only process the non-empty queues */
	if (qs.altq.qid > 0) {
	    stats.nr = qs.nr;
	    stats.ticket = qs.ticket;
	    stats.buf = &q;
	    stats.nbytes = sizeof(q);

	    if (ioctl(pfq_dev, DIOCGETQSTATS, &stats)) {
		fatal("pfq: DIOCGETQSTATS failed");
	    }

	    /* We're now ready to copy the data we want. */
	    strncpy(pfq_stats[i].qname, qs.altq.qname, PF_QNAME_SIZE);

	    switch (qs.altq.scheduler) {
	    case ALTQT_CBQ:
		pfq_stats[i].sent_bytes = q.cbq.xmit_cnt.bytes;
		pfq_stats[i].sent_packets = q.cbq.xmit_cnt.packets;
		pfq_stats[i].drop_bytes = q.cbq.drop_cnt.bytes;
		pfq_stats[i].drop_packets = q.cbq.drop_cnt.packets;
		break;

	    case ALTQT_PRIQ:
		pfq_stats[i].sent_bytes = q.priq.xmitcnt.bytes;
		pfq_stats[i].sent_packets = q.priq.xmitcnt.packets;
		pfq_stats[i].drop_bytes = q.priq.dropcnt.bytes;
		pfq_stats[i].drop_packets = q.priq.dropcnt.packets;
		break;

	    case ALTQT_HFSC:
		pfq_stats[i].sent_bytes = q.hfsc.xmit_cnt.bytes;
		pfq_stats[i].sent_packets = q.hfsc.xmit_cnt.packets;
		pfq_stats[i].drop_bytes = q.hfsc.drop_cnt.bytes;
		pfq_stats[i].drop_packets = q.hfsc.drop_cnt.packets;
		break;

	    default:
		warning("pfq: unknown altq scheduler type encountered");
		break;
	    }
	} else {
	    /* Make sure the lookup in get_pfq fails immediately whenever
	     * there's no queue in the slot. We do this by nul'ing the name */
	    pfq_stats[i].qname[0] = '\0';
	}
    }
}

int
get_pfq(char *symon_buf, int maxlen, char *queue)
{
    unsigned int i;

    for (i = 0; i < pfq_numstats; i++) {
	if (strncmp(pfq_stats[i].qname, queue, PF_QNAME_SIZE) == 0) {
	    return snpack(symon_buf, maxlen, queue, MT_PFQ,
			  pfq_stats[i].sent_bytes,
			  pfq_stats[i].sent_packets,
			  pfq_stats[i].drop_bytes,
			  pfq_stats[i].drop_packets
		);
	}
    }

    return 0;
}

#endif