bfdd/linux.c

   1 /*
   2  * Linux specific code
   3  *
   4  * Copyright (C) 2018 Network Device Education Foundation, Inc. ("NetDEF")
   5  *
   6  * FRR is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * FRR is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with FRR; see the file COPYING.  If not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  * 02111-1307, USA.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #ifdef BFD_LINUX
  25
  26 #include "bfd.h"
  27
  28
  29 /*
  30  * Definitions.
  31  */
  32 int ptm_bfd_fetch_ifindex(const char *ifname)
  33 {
  34         struct ifreq ifr;
  35
  36         if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name))
  37             > sizeof(ifr.ifr_name))
  38                 log_error("interface-to-index: name truncated ('%s' -> '%s')",
  39                           ifr.ifr_name, ifname);
  40
  41         if (ioctl(bglobal.bg_shop, SIOCGIFINDEX, &ifr) == -1) {
  42                 log_error("interface-to-index: %s translation failed: %s",
  43                           ifname, strerror(errno));
  44                 return -1;
  45         }
  46
  47         return ifr.ifr_ifindex;
  48 }
  49
  50 void ptm_bfd_fetch_local_mac(const char *ifname, uint8_t *mac)
  51 {
  52         struct ifreq ifr;
  53
  54         if (strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name))
  55             > sizeof(ifr.ifr_name))
  56                 log_error("interface-mac: name truncated ('%s' -> '%s')",
  57                           ifr.ifr_name, ifname);
  58
  59         if (ioctl(bglobal.bg_shop, SIOCGIFHWADDR, &ifr) == -1) {
  60                 log_error("interface-mac: %s MAC retrieval failed: %s", ifname,
  61                           strerror(errno));
  62                 return;
  63         }
  64
  65         memcpy(mac, ifr.ifr_hwaddr.sa_data, ETHERNET_ADDRESS_LENGTH);
  66 }
  67
  68
  69 /* Was _fetch_portname_from_ifindex() */
  70 void fetch_portname_from_ifindex(int ifindex, char *ifname, size_t ifnamelen)
  71 {
  72         struct ifreq ifr;
  73
  74         ifname[0] = 0;
  75
  76         memset(&ifr, 0, sizeof(ifr));
  77         ifr.ifr_ifindex = ifindex;
  78
  79         if (ioctl(bglobal.bg_shop, SIOCGIFNAME, &ifr) == -1) {
  80                 log_error("index-to-interface: index %d failure: %s", ifindex,
  81                           strerror(errno));
  82                 return;
  83         }
  84
  85         if (strlcpy(ifname, ifr.ifr_name, ifnamelen) >= ifnamelen)
  86                 log_debug("index-to-interface: name truncated '%s' -> '%s'",
  87                           ifr.ifr_name, ifname);
  88 }
  89
  90 int bp_bind_dev(int sd __attribute__((__unused__)),
  91                 const char *dev __attribute__((__unused__)))
  92 {
  93         /*
  94          * TODO: implement this differently. It is not possible to
  95          * SO_BINDTODEVICE after the daemon has dropped its privileges.
  96          */
  97 #if 0
  98         size_t devlen = strlen(dev) + 1;
  99
 100         if (setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, dev, devlen) == -1) {
 101                 log_warning("%s: setsockopt(SO_BINDTODEVICE, \"%s\"): %s",
 102                             __func__, dev, strerror(errno));
 103                 return -1;
 104         }
 105 #endif
 106
 107         return 0;
 108 }
 109
 110 #endif /* BFD_LINUX */