lib/libkinfo/kinfo_net.c

   1 /*
   2  * Copyright (c) 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Hiten Pandya <hmp@dragonflybsd.org>.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/lib/libkinfo/kinfo_net.c,v 1.1 2005/05/01 06:05:35 hmp Exp $
  35  */
  36
  37 #include <sys/param.h>
  38 #include <sys/socket.h>
  39 #include <sys/sysctl.h>
  40
  41 #include <net/route.h>
  42
  43 #include <assert.h>
  44 #include <stdlib.h>
  45 #include <errno.h>
  46 #include <kinfo.h>
  47
  48 int
  49 kinfo_get_net_rtstatistics(struct rtstatistics *rts)
  50 {
  51         struct rtstatistics *percpu = NULL;
  52         size_t len = sizeof(struct rtstatistics) * SMP_MAXCPU;
  53         int cpucount, error = 0;
  54
  55         _DIAGASSERT(rts != NULL);
  56
  57         if ((percpu = malloc(len)) == NULL) {
  58                 error = ENOMEM;
  59                 goto done;
  60         }
  61
  62         /* retrieve verbatim per-cpu statistics from kernel */
  63         if (sysctlbyname("net.route.stats", percpu, &len, NULL, 0) < 0) {
  64                 error = errno;
  65                 goto done;
  66         } else {
  67                 percpu = reallocf(percpu, len);
  68                 if (percpu == NULL) {
  69                         error = ENOMEM;
  70                         goto done;
  71                 }
  72         }
  73
  74         /* aggregate per-cpu statistics retrieved from kernel */
  75         cpucount = len / sizeof(struct rtstatistics);
  76         route_pcpu_statistics(percpu, rts, cpucount);
  77
  78 done:
  79         if (percpu != NULL)
  80                 free(percpu);
  81         return (error);
  82 }