src/network/netdev/veth.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2014 Susant Sahani <susant@redhat.com>
   6 ***/
   7
   8 #include <errno.h>
   9 #include <linux/veth.h>
  10 #include <net/if.h>
  11
  12 #include "sd-netlink.h"
  13
  14 #include "netdev/veth.h"
  15
  16 static int netdev_veth_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) {
  17         Veth *v;
  18         int r;
  19
  20         assert(netdev);
  21         assert(!link);
  22         assert(m);
  23
  24         v = VETH(netdev);
  25
  26         assert(v);
  27
  28         r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
  29         if (r < 0)
  30                 return log_netdev_error_errno(netdev, r, "Could not append VETH_INFO_PEER attribute: %m");
  31
  32         if (v->ifname_peer) {
  33                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, v->ifname_peer);
  34                 if (r < 0)
  35                         return log_error_errno(r, "Failed to add netlink interface name: %m");
  36         }
  37
  38         if (v->mac_peer) {
  39                 r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, v->mac_peer);
  40                 if (r < 0)
  41                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
  42         }
  43
  44         r = sd_netlink_message_close_container(m);
  45         if (r < 0)
  46                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
  47
  48         return r;
  49 }
  50
  51 static int netdev_veth_verify(NetDev *netdev, const char *filename) {
  52         Veth *v;
  53         int r;
  54
  55         assert(netdev);
  56         assert(filename);
  57
  58         v = VETH(netdev);
  59
  60         assert(v);
  61
  62         if (!v->ifname_peer) {
  63                 log_warning("Veth NetDev without peer name configured in %s. Ignoring",
  64                             filename);
  65                 return -EINVAL;
  66         }
  67
  68         if (!v->mac_peer) {
  69                 r = netdev_get_mac(v->ifname_peer, &v->mac_peer);
  70                 if (r < 0) {
  71                         log_warning("Failed to generate predictable MAC address for %s. Ignoring",
  72                                   v->ifname_peer);
  73                         return -EINVAL;
  74                 }
  75         }
  76
  77         return 0;
  78 }
  79
  80 static void veth_done(NetDev *n) {
  81         Veth *v;
  82
  83         assert(n);
  84
  85         v = VETH(n);
  86
  87         assert(v);
  88
  89         free(v->ifname_peer);
  90         free(v->mac_peer);
  91 }
  92
  93 const NetDevVTable veth_vtable = {
  94         .object_size = sizeof(Veth),
  95         .sections = "Match\0NetDev\0Peer\0",
  96         .done = veth_done,
  97         .fill_message_create = netdev_veth_fill_message_create,
  98         .create_type = NETDEV_CREATE_INDEPENDENT,
  99         .config_verify = netdev_veth_verify,
 100 };