src/network/netdev/veth.c

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