usr.bin/netstat/bpf.c

   1 /*      $NetBSD: bpf.c,v 1.8 2008/04/28 20:24:14 martin 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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <err.h>
  33 #include <errno.h>
  34 #include <fcntl.h>
  35 #include <kvm.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <unistd.h>
  40 #include <net/if.h>
  41 #include <sys/types.h>
  42 #include <sys/param.h>
  43 #include <sys/sysctl.h>
  44 #include <net/bpfdesc.h>
  45 #include <net/bpf.h>
  46 #include "netstat.h"
  47
  48 void
  49 bpf_stats(void)
  50 {
  51         struct bpf_stat bpf_s;
  52         size_t len = sizeof(bpf_s);
  53
  54         if (use_sysctl) {
  55                 if (sysctlbyname("net.bpf.stats", &bpf_s, &len, NULL, 0) == -1)
  56                         err(1, "net.bpf.stats");
  57
  58                 printf("bpf:\n");
  59                 printf("\t%" PRIu64 " total packets received\n",
  60                     bpf_s.bs_recv);
  61                 printf("\t%" PRIu64 " total packets captured\n",
  62                     bpf_s.bs_capt);
  63                 printf("\t%" PRIu64 " total packets dropped\n",
  64                     bpf_s.bs_drop);
  65         } else {
  66                 warnx("BPF stats not available via KVM.");
  67         }
  68 }
  69
  70 void
  71 bpf_dump(const char *bpfif)
  72 {
  73         struct bpf_d_ext *dpe;
  74
  75         if (use_sysctl) {
  76                 int     name[CTL_MAXNAME], rc;
  77                 size_t  i, sz, szproc;
  78                 u_int   namelen;
  79                 void    *v;
  80                 struct kinfo_proc2 p;
  81
  82                 /* adapted from sockstat.c by Andrew Brown */
  83
  84                 sz = CTL_MAXNAME;
  85                 if (sysctlnametomib("net.bpf.peers", &name[0], &sz) == -1)
  86                         err(1, "sysctlnametomib: net.bpf.peers");
  87                 namelen = sz;
  88
  89                 name[namelen++] = sizeof(*dpe);
  90                 name[namelen++] = INT_MAX;
  91
  92                 v = NULL;
  93                 sz = 0;
  94                 do {
  95                         rc = sysctl(&name[0], namelen, v, &sz, NULL, 0);
  96                         if (rc == -1 && errno != ENOMEM)
  97                                 err(1, "sysctl: net.bpf.peers");
  98                         if (rc == -1 && v != NULL) {
  99                                 free(v);
 100                                 v = NULL;
 101                         }
 102                         if (v == NULL) {
 103                                 v = malloc(sz);
 104                                 rc = -1;
 105                         }
 106                         if (v == NULL)
 107                                 err(1, "malloc");
 108                 } while (rc == -1);
 109
 110                 dpe = v;
 111
 112                 puts("Active BPF peers\nPID\tInt\tRecv     Drop     Capt" \
 113                     "     Flags  Bufsize  Comm");
 114
 115 #define BPFEXT(entry) dpe->entry
 116
 117                 for (i = 0; i < (sz / sizeof(*dpe)); i++, dpe++) {
 118                         if (bpfif &&
 119                             strncmp(BPFEXT(bde_ifname), bpfif, IFNAMSIZ))
 120                                 continue;
 121
 122                         printf("%-7d ", BPFEXT(bde_pid));
 123                         printf("%-7s ",
 124                                (BPFEXT(bde_ifname)[0] == '\0') ? "-" :
 125                                BPFEXT(bde_ifname));
 126
 127                         printf("%-8" PRIu64 " %-8" PRIu64 " %-8" PRIu64 " ",
 128                                 BPFEXT(bde_rcount), BPFEXT(bde_dcount),
 129                                 BPFEXT(bde_ccount));
 130
 131                         switch (BPFEXT(bde_state)) {
 132                         case BPF_IDLE:
 133                                 printf("I");
 134                                 break;
 135                         case BPF_WAITING:
 136                                 printf("W");
 137                                 break;
 138                         case BPF_TIMED_OUT:
 139                                 printf("T");
 140                                 break;
 141                         default:
 142                                 printf("-");
 143                                 break;
 144                         }
 145
 146                         printf("%c", BPFEXT(bde_promisc) ? 'P' : '-');
 147                         printf("%c", BPFEXT(bde_immediate) ? 'R' : '-');
 148                         printf("%c", BPFEXT(bde_seesent) ? 'S' : '-');
 149                         printf("%c", BPFEXT(bde_hdrcmplt) ? 'H' : '-');
 150                         printf("  %-8d ", BPFEXT(bde_bufsize));
 151
 152                         szproc = sizeof(p);
 153                         namelen = 0;
 154                         name[namelen++] = CTL_KERN;
 155                         name[namelen++] = KERN_PROC2;
 156                         name[namelen++] = KERN_PROC_PID;
 157                         name[namelen++] = BPFEXT(bde_pid);
 158                         name[namelen++] = szproc;
 159                         name[namelen++] = 1;
 160
 161                         if (sysctl(&name[0], namelen, &p, &szproc,
 162                             NULL, 0) == -1)
 163                                 printf("-\n");
 164                         else
 165                                 printf("%s\n", p.p_comm);
 166 #undef BPFEXT
 167                 }
 168         } else {
 169                 /* XXX */
 170                 errx(1, "bpf_dump not implemented using kvm");
 171         }
 172 }