src/network/netdev/veth.c

   1 /***
   2     This file is part of systemd.
   3
   4     Copyright 2014 Susant Sahani <susant@redhat.com>
   5
   6     systemd is free software; you can redistribute it and/or modify it
   7     under the terms of the GNU Lesser General Public License as published by
   8     the Free Software Foundation; either version 2.1 of the License, or
   9     (at your option) any later version.
  10
  11     systemd 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     Lesser General Public License for more details.
  15
  16     You should have received a copy of the GNU Lesser General Public License
  17     along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <net/if.h>
  21 #include <linux/veth.h>
  22
  23 #include "sd-netlink.h"
  24
  25 #include "netdev/veth.h"
  26
  27 static int netdev_veth_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) {
  28         Veth *v;
  29         int r;
  30
  31         assert(netdev);
  32         assert(!link);
  33         assert(m);
  34
  35         v = VETH(netdev);
  36
  37         assert(v);
  38
  39         r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
  40         if (r < 0)
  41                 return log_netdev_error_errno(netdev, r, "Could not append VETH_INFO_PEER attribute: %m");
  42
  43         if (v->ifname_peer) {
  44                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, v->ifname_peer);
  45                 if (r < 0)
  46                         return log_error_errno(r, "Failed to add netlink interface name: %m");
  47         }
  48
  49         if (v->mac_peer) {
  50                 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, v->mac_peer);
  51                 if (r < 0)
  52                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
  53         }
  54
  55         r = sd_netlink_message_close_container(m);
  56         if (r < 0)
  57                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
  58
  59         return r;
  60 }
  61
  62 static int netdev_veth_verify(NetDev *netdev, const char *filename) {
  63         Veth *v;
  64         int r;
  65
  66         assert(netdev);
  67         assert(filename);
  68
  69         v = VETH(netdev);
  70
  71         assert(v);
  72
  73         if (!v->ifname_peer) {
  74                 log_warning("Veth NetDev without peer name configured in %s. Ignoring",
  75                             filename);
  76                 return -EINVAL;
  77         }
  78
  79         if (!v->mac_peer) {
  80                 r = netdev_get_mac(v->ifname_peer, &v->mac_peer);
  81                 if (r < 0) {
  82                         log_warning("Failed to generate predictable MAC address for %s. Ignoring",
  83                                   v->ifname_peer);
  84                         return -EINVAL;
  85                 }
  86         }
  87
  88         return 0;
  89 }
  90
  91 static void veth_done(NetDev *n) {
  92         Veth *v;
  93
  94         assert(n);
  95
  96         v = VETH(n);
  97
  98         assert(v);
  99
 100         free(v->ifname_peer);
 101         free(v->mac_peer);
 102 }
 103
 104 const NetDevVTable veth_vtable = {
 105         .object_size = sizeof(Veth),
 106         .sections = "Match\0NetDev\0Peer\0",
 107         .done = veth_done,
 108         .fill_message_create = netdev_veth_fill_message_create,
 109         .create_type = NETDEV_CREATE_INDEPENDENT,
 110         .config_verify = netdev_veth_verify,
 111 };