xref: /src/usr.bin/netstat/bpf.c

/* $NetBSD: bpf.c,v 1.1 2005/08/04 19:39:40 rpaulo Exp $ */

/*
 * Copyright (c) 2005 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Rui Paulo.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/sysctl.h>
#include <net/bpfdesc.h>
#include <net/bpf.h>
#include "netstat.h"

void
bpf_stats(void)
{
	struct bpf_stat bpf_s;
	size_t len = sizeof(bpf_s);

	if (sysctlbyname("net.bpf.stats", &bpf_s, &len, NULL, 0) == -1)
		err(1, "net.bpf.stats");

	printf("bpf:\n");
	printf("\t%lld total packets received\n", bpf_s.bs_recv);
	printf("\t%lld total packets captured\n", bpf_s.bs_capt);
	printf("\t%lld total packets dropped\n", bpf_s.bs_drop);
}

void
bpf_dump(kvm_t *kd, char *interface)
{
	int    name[CTL_MAXNAME], rc, i, cnt;
	size_t sz;
	u_int  namelen;
	void  *v;
	struct bpf_d_ext *dpe;
	struct kinfo_proc *kp;

	/* adapted from sockstat.c by Andrew Brown */

	sz = CTL_MAXNAME;
	if (sysctlnametomib("net.bpf.peers", &name[0], &sz) == -1)
		err(1, "sysctlnametomib");
	namelen = sz;

	name[namelen++] = sizeof(*dpe);
	name[namelen++] = INT_MAX;

	v = NULL;
	sz = 0;
	do {
		rc = sysctl(&name[0], namelen, v, &sz, NULL, 0);
		if (rc == -1 && errno != ENOMEM)
			err(1, "sysctl: net.bpf.peers");
		if (rc == -1 && v != NULL) {
			free(v);
			v = NULL;
		}
		if (v == NULL) {
			v = malloc(sz);
			rc = -1;
		}
		if (v == NULL)
			err(1, "malloc");
	} while (rc == -1);

	dpe = v;

	printf("Active BPF peers\n");
	printf("PID\tInt\tRecv     Drop     Capt     Flags  Bufsize  Comm\n");

#define BPFEXT(entry) dpe->entry

	for (i = 0; i < (sz / sizeof(*dpe)); i++, dpe++) {
		if (interface &&
		    strncmp(BPFEXT(bde_ifname), interface, IFNAMSIZ))
			continue;

		printf("%-7d ", BPFEXT(bde_pid));
		printf("%-7s ",
		       (BPFEXT(bde_ifname)[0] == '\0') ? "-" :
		       BPFEXT(bde_ifname));

		printf("%-8lld %-8lld %-8lld ",
			BPFEXT(bde_rcount), BPFEXT(bde_dcount),
			BPFEXT(bde_ccount));

		switch (BPFEXT(bde_state)) {
		case BPF_IDLE:
			printf("I");
			break;
		case BPF_WAITING:
			printf("W");
			break;
		case BPF_TIMED_OUT:
			printf("T");
			break;
		default:
			printf("-");
			break;
		}

		printf("%c", BPFEXT(bde_promisc) ? 'P' : '-');
		printf("%c", BPFEXT(bde_immediate) ? 'R' : '-');
		printf("%c", BPFEXT(bde_seesent) ? 'S' : '-');
		printf("%c", BPFEXT(bde_hdrcmplt) ? 'H' : '-');
		printf("  %-8d ", BPFEXT(bde_bufsize));

		kp = kvm_getprocs(kd, KERN_PROC_PID, BPFEXT(bde_pid), &cnt);

		if (cnt && kd)
			printf("%s\n", kp->kp_proc.p_comm);
		else
			printf("-\n");
#undef BPFEXT
	}
}