src/network/networkd-netdev-veth.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4     This file is part of systemd.
   5
   6     Copyright 2014 Susant Sahani <susant@redhat.com>
   7
   8     systemd is free software; you can redistribute it and/or modify it
   9     under the terms of the GNU Lesser General Public License as published by
  10     the Free Software Foundation; either version 2.1 of the License, or
  11     (at your option) any later version.
  12
  13     systemd is distributed in the hope that it will be useful, but
  14     WITHOUT ANY WARRANTY; without even the implied warranty of
  15     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16     Lesser General Public License for more details.
  17
  18     You should have received a copy of the GNU Lesser General Public License
  19     along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <netinet/ether.h>
  23 #include <arpa/inet.h>
  24 #include <net/if.h>
  25 #include <linux/veth.h>
  26
  27 #include "sd-rtnl.h"
  28 #include "networkd-netdev-veth.h"
  29
  30 static int netdev_veth_fill_message_create(NetDev *netdev, sd_rtnl_message *m) {
  31         int r;
  32
  33         assert(netdev);
  34         assert(netdev->ifname);
  35         assert(m);
  36
  37         r = sd_rtnl_message_append_string(m, IFLA_IFNAME, netdev->ifname);
  38         if (r < 0) {
  39                 log_error_netdev(netdev,
  40                                  "Could not append IFLA_IFNAME, attribute: %s",
  41                                  strerror(-r));
  42                 return r;
  43         }
  44
  45         if (netdev->mac) {
  46                 r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
  47                 if (r < 0) {
  48                         log_error_netdev(netdev,
  49                                          "Colud not append IFLA_ADDRESS attribute: %s",
  50                                          strerror(-r));
  51                     return r;
  52                 }
  53         }
  54
  55         r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
  56         if (r < 0) {
  57                 log_error_netdev(netdev,
  58                                  "Could not append IFLA_LINKINFO attribute: %s",
  59                                  strerror(-r));
  60                 return r;
  61         }
  62
  63         r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA, "veth");
  64         if (r < 0) {
  65                 log_error_netdev(netdev,
  66                                  "Could not append IFLA_INFO_DATA attribute: %s",
  67                                  strerror(-r));
  68                 return r;
  69         }
  70
  71         r = sd_rtnl_message_open_container(m, VETH_INFO_PEER);
  72         if (r < 0) {
  73                 log_error_netdev(netdev,
  74                                  "Could not append IFLA_IPTUN_LINK attribute: %s",
  75                                  strerror(-r));
  76                 return r;
  77         }
  78
  79         if (netdev->ifname_peer) {
  80                 r = sd_rtnl_message_append_string(m, IFLA_IFNAME, netdev->ifname_peer);
  81                 if (r < 0) {
  82                         log_error("Failed to add netlink interface name: %s", strerror(-r));
  83                         return r;
  84                 }
  85         }
  86
  87         if (netdev->mac_peer) {
  88                 r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac_peer);
  89                 if (r < 0) {
  90                         log_error_netdev(netdev,
  91                                          "Colud not append IFLA_ADDRESS attribute: %s",
  92                                          strerror(-r));
  93                     return r;
  94                 }
  95         }
  96
  97         r = sd_rtnl_message_close_container(m);
  98         if (r < 0) {
  99                 log_error_netdev(netdev,
 100                                  "Could not append IFLA_INFO_DATA attribute: %s",
 101                                  strerror(-r));
 102                 return r;
 103         }
 104
 105         r = sd_rtnl_message_close_container(m);
 106         if (r < 0) {
 107                 log_error_netdev(netdev,
 108                                  "Could not append IFLA_LINKINFO attribute: %s",
 109                                  strerror(-r));
 110                 return r;
 111         }
 112
 113         return r;
 114 }
 115
 116 static int netdev_veth_verify(NetDev *netdev, const char *filename) {
 117         int r;
 118
 119         assert(netdev);
 120         assert(filename);
 121
 122         if (!netdev->ifname_peer) {
 123                 log_warning("Veth NetDev without peer name configured in %s. Ignoring",
 124                             filename);
 125                 return -EINVAL;
 126         }
 127
 128         if (!netdev->mac_peer) {
 129                 r = netdev_get_mac(netdev->ifname_peer, &netdev->mac_peer);
 130                 if (r < 0) {
 131                         log_warning("Failed to generate predictable MAC address for %s. Ignoring",
 132                                   netdev->ifname_peer);
 133                         return -EINVAL;
 134                 }
 135         }
 136
 137         return 0;
 138 }
 139
 140 const NetDevVTable veth_vtable = {
 141         .fill_message_create = netdev_veth_fill_message_create,
 142         .config_verify = netdev_veth_verify,
 143 };