zebra/if_sysctl.c

   1 /*
   2  * Get interface's address and mask information by sysctl() function.
   3  * Copyright (C) 1997, 98 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; see the file COPYING; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <zebra.h>
  23
  24 #if !defined(GNU_LINUX) && !defined(OPEN_BSD)
  25
  26 #include "if.h"
  27 #include "sockunion.h"
  28 #include "prefix.h"
  29 #include "connected.h"
  30 #include "memory.h"
  31 #include "ioctl.h"
  32 #include "log.h"
  33 #include "interface.h"
  34 #include "vrf.h"
  35
  36 #include "zebra/rt.h"
  37 #include "zebra/kernel_socket.h"
  38 #include "zebra/rib.h"
  39 #include "zebra/zebra_errors.h"
  40
  41 void ifstat_update_sysctl(void)
  42 {
  43         caddr_t ref, buf, end;
  44         size_t bufsiz;
  45         struct if_msghdr *ifm;
  46         struct interface *ifp;
  47
  48 #define MIBSIZ 6
  49         int mib[MIBSIZ] = {
  50                 CTL_NET,       PF_ROUTE, 0, 0, /*  AF_INET & AF_INET6 */
  51                 NET_RT_IFLIST, 0};
  52
  53         /* Query buffer size. */
  54         if (sysctl(mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0) {
  55                 flog_warn(EC_ZEBRA_SYSCTL_FAILED, "sysctl() error by %s",
  56                           safe_strerror(errno));
  57                 return;
  58         }
  59
  60         /* We free this memory at the end of this function. */
  61         ref = buf = XMALLOC(MTYPE_TMP, bufsiz);
  62
  63         /* Fetch interface information into allocated buffer. */
  64         if (sysctl(mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0) {
  65                 flog_warn(EC_ZEBRA_SYSCTL_FAILED, "sysctl error by %s",
  66                           safe_strerror(errno));
  67                 XFREE(MTYPE_TMP, ref);
  68                 return;
  69         }
  70
  71         /* Parse both interfaces and addresses. */
  72         for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen) {
  73                 ifm = (struct if_msghdr *)buf;
  74                 if (ifm->ifm_type == RTM_IFINFO) {
  75                         ifp = if_lookup_by_index(ifm->ifm_index, VRF_DEFAULT);
  76                         if (ifp)
  77                                 ifp->stats = ifm->ifm_data;
  78                 }
  79         }
  80
  81         /* Free sysctl buffer. */
  82         XFREE(MTYPE_TMP, ref);
  83
  84         return;
  85 }
  86
  87 /* Interface listing up function using sysctl(). */
  88 void interface_list(struct zebra_ns *zns)
  89 {
  90         caddr_t ref, buf, end;
  91         size_t bufsiz;
  92         struct if_msghdr *ifm;
  93
  94 #define MIBSIZ 6
  95         int mib[MIBSIZ] = {
  96                 CTL_NET,       PF_ROUTE, 0, 0, /*  AF_INET & AF_INET6 */
  97                 NET_RT_IFLIST, 0};
  98
  99         if (zns->ns_id != NS_DEFAULT) {
 100                 zlog_debug("%s: ignore NS %u", __func__, zns->ns_id);
 101                 return;
 102         }
 103
 104         /* Query buffer size. */
 105         if (sysctl(mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0) {
 106                 flog_err_sys(EC_ZEBRA_IFLIST_FAILED,
 107                              "Could not enumerate interfaces: %s",
 108                              safe_strerror(errno));
 109                 return;
 110         }
 111
 112         /* We free this memory at the end of this function. */
 113         ref = buf = XMALLOC(MTYPE_TMP, bufsiz);
 114
 115         /* Fetch interface information into allocated buffer. */
 116         if (sysctl(mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0) {
 117                 flog_err_sys(EC_ZEBRA_IFLIST_FAILED,
 118                              "Could not enumerate interfaces: %s",
 119                              safe_strerror(errno));
 120                 return;
 121         }
 122
 123         /* Parse both interfaces and addresses. */
 124         for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen) {
 125                 ifm = (struct if_msghdr *)buf;
 126
 127                 switch (ifm->ifm_type) {
 128                 case RTM_IFINFO:
 129                         ifm_read(ifm);
 130                         break;
 131                 case RTM_NEWADDR:
 132                         ifam_read((struct ifa_msghdr *)ifm);
 133                         break;
 134                 default:
 135                         zlog_info("%s: unexpected message type", __func__);
 136                         XFREE(MTYPE_TMP, ref);
 137                         return;
 138                         break;
 139                 }
 140         }
 141
 142         /* Free sysctl buffer. */
 143         XFREE(MTYPE_TMP, ref);
 144 }
 145
 146 #endif /* !defined(GNU_LINUX) && !defined(OPEN_BSD) */