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bpf.c revision 1.1 
      1 /* $NetBSD: bpf.c,v 1.1 2005/08/04 19:39:40 rpaulo Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2005 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Rui Paulo.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <err.h>
     40 #include <errno.h>
     41 #include <fcntl.h>
     42 #include <kvm.h>
     43 #include <stdio.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <unistd.h>
     47 #include <net/if.h>
     48 #include <sys/types.h>
     49 #include <sys/param.h>
     50 #include <sys/sysctl.h>
     51 #include <net/bpfdesc.h>
     52 #include <net/bpf.h>
     53 #include "netstat.h"
     54 
     55 void
     56 bpf_stats(void)
     57 {
     58 	struct bpf_stat bpf_s;
     59 	size_t len = sizeof(bpf_s);
     60 
     61 	if (sysctlbyname("net.bpf.stats", &bpf_s, &len, NULL, 0) == -1)
     62 		err(1, "net.bpf.stats");
     63 
     64 	printf("bpf:\n");
     65 	printf("\t%lld total packets received\n", bpf_s.bs_recv);
     66 	printf("\t%lld total packets captured\n", bpf_s.bs_capt);
     67 	printf("\t%lld total packets dropped\n", bpf_s.bs_drop);
     68 }
     69 
     70 void
     71 bpf_dump(kvm_t *kd, char *interface)
     72 {
     73 	int    name[CTL_MAXNAME], rc, i, cnt;
     74 	size_t sz;
     75 	u_int  namelen;
     76 	void  *v;
     77 	struct bpf_d_ext *dpe;
     78 	struct kinfo_proc *kp;
     79 
     80 	/* adapted from sockstat.c by Andrew Brown */
     81 
     82 	sz = CTL_MAXNAME;
     83 	if (sysctlnametomib("net.bpf.peers", &name[0], &sz) == -1)
     84 		err(1, "sysctlnametomib");
     85 	namelen = sz;
     86 
     87 	name[namelen++] = sizeof(*dpe);
     88 	name[namelen++] = INT_MAX;
     89 
     90 	v = NULL;
     91 	sz = 0;
     92 	do {
     93 		rc = sysctl(&name[0], namelen, v, &sz, NULL, 0);
     94 		if (rc == -1 && errno != ENOMEM)
     95 			err(1, "sysctl: net.bpf.peers");
     96 		if (rc == -1 && v != NULL) {
     97 			free(v);
     98 			v = NULL;
     99 		}
    100 		if (v == NULL) {
    101 			v = malloc(sz);
    102 			rc = -1;
    103 		}
    104 		if (v == NULL)
    105 			err(1, "malloc");
    106 	} while (rc == -1);
    107 
    108 	dpe = v;
    109 
    110 	printf("Active BPF peers\n");
    111 	printf("PID\tInt\tRecv     Drop     Capt     Flags  Bufsize  Comm\n");
    112 
    113 #define BPFEXT(entry) dpe->entry
    114 
    115 	for (i = 0; i < (sz / sizeof(*dpe)); i++, dpe++) {
    116 		if (interface &&
    117 		    strncmp(BPFEXT(bde_ifname), interface, IFNAMSIZ))
    118 			continue;
    119 
    120 		printf("%-7d ", BPFEXT(bde_pid));
    121 		printf("%-7s ",
    122 		       (BPFEXT(bde_ifname)[0] == '\0') ? "-" :
    123 		       BPFEXT(bde_ifname));
    124 
    125 		printf("%-8lld %-8lld %-8lld ",
    126 			BPFEXT(bde_rcount), BPFEXT(bde_dcount),
    127 			BPFEXT(bde_ccount));
    128 
    129 		switch (BPFEXT(bde_state)) {
    130 		case BPF_IDLE:
    131 			printf("I");
    132 			break;
    133 		case BPF_WAITING:
    134 			printf("W");
    135 			break;
    136 		case BPF_TIMED_OUT:
    137 			printf("T");
    138 			break;
    139 		default:
    140 			printf("-");
    141 			break;
    142 		}
    143 
    144 		printf("%c", BPFEXT(bde_promisc) ? 'P' : '-');
    145 		printf("%c", BPFEXT(bde_immediate) ? 'R' : '-');
    146 		printf("%c", BPFEXT(bde_seesent) ? 'S' : '-');
    147 		printf("%c", BPFEXT(bde_hdrcmplt) ? 'H' : '-');
    148 		printf("  %-8d ", BPFEXT(bde_bufsize));
    149 
    150 		kp = kvm_getprocs(kd, KERN_PROC_PID, BPFEXT(bde_pid), &cnt);
    151 
    152 		if (cnt && kd)
    153 			printf("%s\n", kp->kp_proc.p_comm);
    154 		else
    155 			printf("-\n");
    156 #undef BPFEXT
    157 	}
    158 }
    159