bfdd/bsd.c

   1 /*
   2  * *BSD 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_BSD
  25
  26 #include <net/if.h>
  27 #include <net/if_types.h>
  28 #include <sys/types.h>
  29 #include <sys/socket.h>
  30
  31 #include <ifaddrs.h>
  32
  33 #include "bfd.h"
  34
  35 /*
  36  * Definitions.
  37  */
  38 int ptm_bfd_fetch_ifindex(const char *ifname)
  39 {
  40         return if_nametoindex(ifname);
  41 }
  42
  43 void ptm_bfd_fetch_local_mac(const char *ifname, uint8_t *mac)
  44 {
  45         struct ifaddrs *ifap, *ifa;
  46         struct if_data *ifi;
  47         struct sockaddr_dl *sdl;
  48         size_t maclen;
  49
  50         /* Always clean the target, zeroed macs mean failure. */
  51         memset(mac, 0, ETHERNET_ADDRESS_LENGTH);
  52
  53         if (getifaddrs(&ifap) != 0)
  54                 return;
  55
  56         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
  57                 /* Find interface with that name. */
  58                 if (strcmp(ifa->ifa_name, ifname) != 0)
  59                         continue;
  60                 /* Skip non link addresses. We want the MAC address. */
  61                 if (ifa->ifa_addr->sa_family != AF_LINK)
  62                         continue;
  63
  64                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  65                 ifi = (struct if_data *)ifa->ifa_data;
  66                 /* Skip non ethernet related data. */
  67                 if (ifi->ifi_type != IFT_ETHER)
  68                         continue;
  69
  70                 if (sdl->sdl_alen != ETHERNET_ADDRESS_LENGTH)
  71                         log_warning("%s:%d mac address length %d (expected %d)",
  72                                     __func__, __LINE__, sdl->sdl_alen,
  73                                     ETHERNET_ADDRESS_LENGTH);
  74
  75                 maclen = (sdl->sdl_alen > ETHERNET_ADDRESS_LENGTH)
  76                                  ? ETHERNET_ADDRESS_LENGTH
  77                                  : sdl->sdl_alen;
  78                 memcpy(mac, LLADDR(sdl), maclen);
  79                 break;
  80         }
  81
  82         freeifaddrs(ifap);
  83 }
  84
  85
  86 /* Was _fetch_portname_from_ifindex() */
  87 void fetch_portname_from_ifindex(int ifindex, char *ifname, size_t ifnamelen)
  88 {
  89         char ifname_tmp[IF_NAMESIZE];
  90
  91         /* Set ifname to empty to signalize failures. */
  92         memset(ifname, 0, ifnamelen);
  93
  94         if (if_indextoname(ifindex, ifname_tmp) == NULL)
  95                 return;
  96
  97         if (strlcpy(ifname, ifname_tmp, ifnamelen) > ifnamelen)
  98                 log_warning("%s:%d interface name truncated", __func__,
  99                             __LINE__);
 100 }
 101
 102 int bp_bind_dev(int sd, const char *dev)
 103 {
 104         /*
 105          * *BSDs don't support `SO_BINDTODEVICE`, instead you must
 106          * manually specify the main address of the interface or use
 107          * BPF on the socket descriptor.
 108          */
 109         return 0;
 110 }
 111
 112 #endif /* BFD_BSD */