src/network/netdev/veth.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   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_netdev_error_errno(netdev, 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         if (netdev->mtu != 0) {
  38                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
  39                 if (r < 0)
  40                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
  41         }
  42
  43         r = sd_netlink_message_close_container(m);
  44         if (r < 0)
  45                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
  46
  47         return r;
  48 }
  49
  50 static int netdev_veth_verify(NetDev *netdev, const char *filename) {
  51         Veth *v;
  52         int r;
  53
  54         assert(netdev);
  55         assert(filename);
  56
  57         v = VETH(netdev);
  58
  59         assert(v);
  60
  61         if (!v->ifname_peer)
  62                 return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
  63                                                 "Veth NetDev without peer name configured in %s. Ignoring",
  64                                                 filename);
  65
  66         if (!v->mac_peer) {
  67                 r = netdev_get_mac(v->ifname_peer, &v->mac_peer);
  68                 if (r < 0)
  69                         return log_netdev_warning_errno(netdev, r,
  70                                                         "Failed to generate predictable MAC address for %s: %m",
  71                                                         v->ifname_peer);
  72         }
  73
  74         return 0;
  75 }
  76
  77 static void veth_done(NetDev *n) {
  78         Veth *v;
  79
  80         assert(n);
  81
  82         v = VETH(n);
  83
  84         assert(v);
  85
  86         free(v->ifname_peer);
  87         free(v->mac_peer);
  88 }
  89
  90 const NetDevVTable veth_vtable = {
  91         .object_size = sizeof(Veth),
  92         .sections = NETDEV_COMMON_SECTIONS "Peer\0",
  93         .done = veth_done,
  94         .fill_message_create = netdev_veth_fill_message_create,
  95         .create_type = NETDEV_CREATE_INDEPENDENT,
  96         .config_verify = netdev_veth_verify,
  97         .generate_mac = true,
  98 };