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 04:05:35 hmp Exp $
  35  */
  36
  37 #include <sys/kinfo.h>
  38 #include <sys/param.h>
  39 #include <sys/socket.h>
  40 #include <sys/sysctl.h>
  41
  42 #include <net/route.h>
  43
  44 #include <assert.h>
  45 #include <stdlib.h>
  46 #include <errno.h>
  47 #include <kinfo.h>
  48
  49 int
  50 kinfo_get_net_rtstatistics(struct rtstatistics *rts)
  51 {
  52         struct rtstatistics *percpu = NULL;
  53         size_t len = sizeof(struct rtstatistics) * SMP_MAXCPU;
  54         int cpucount, error = 0;
  55
  56         _DIAGASSERT(rts != NULL);
  57
  58         if ((percpu = malloc(len)) == NULL) {
  59                 error = ENOMEM;
  60                 goto done;
  61         }
  62
  63         /* retrieve verbatim per-cpu statistics from kernel */
  64         if (sysctlbyname("net.route.stats", percpu, &len, NULL, 0) < 0) {
  65                 error = errno;
  66                 goto done;
  67         } else {
  68                 percpu = reallocf(percpu, len);
  69                 if (percpu == NULL) {
  70                         error = ENOMEM;
  71                         goto done;
  72                 }
  73         }
  74
  75         /* aggregate per-cpu statistics retrieved from kernel */
  76         cpucount = len / sizeof(struct rtstatistics);
  77         route_pcpu_statistics(percpu, rts, cpucount);
  78
  79 done:
  80         if (percpu != NULL)
  81                 free(percpu);
  82         return (error);
  83 }