src/network/netdev/veth.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 /* Make sure the net/if.h header is included before any linux/ one */
   4 #include <net/if.h>
   5 #include <errno.h>
   6 #include <linux/if_arp.h>
   7 #include <linux/veth.h>
   8 #include <netinet/in.h>
   9
  10 #include "netlink-util.h"
  11 #include "veth.h"
  12
  13 static int netdev_veth_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) {
  14         assert(!link);
  15         assert(m);
  16
  17         struct hw_addr_data hw_addr;
  18         Veth *v = VETH(netdev);
  19         int r;
  20
  21         r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
  22         if (r < 0)
  23                 return r;
  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 r;
  29         }
  30
  31         r = netdev_generate_hw_addr(netdev, NULL, v->ifname_peer, &v->hw_addr_peer, &hw_addr);
  32         if (r < 0)
  33                 return r;
  34
  35         if (hw_addr.length > 0) {
  36                 log_netdev_debug(netdev, "Using MAC address for peer: %s", HW_ADDR_TO_STR(&hw_addr));
  37                 r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
  38                 if (r < 0)
  39                         return r;
  40         }
  41
  42         if (netdev->mtu != 0) {
  43                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
  44                 if (r < 0)
  45                         return r;
  46         }
  47
  48         r = sd_netlink_message_close_container(m);
  49         if (r < 0)
  50                 return r;
  51
  52         return 0;
  53 }
  54
  55 static int netdev_veth_verify(NetDev *netdev, const char *filename) {
  56         assert(filename);
  57
  58         Veth *v = VETH(netdev);
  59
  60         if (!v->ifname_peer)
  61                 return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
  62                                                 "Veth NetDev without peer name configured in %s. Ignoring",
  63                                                 filename);
  64
  65         return 0;
  66 }
  67
  68 static void veth_done(NetDev *netdev) {
  69         Veth *v = VETH(netdev);
  70
  71         free(v->ifname_peer);
  72 }
  73
  74 const NetDevVTable veth_vtable = {
  75         .object_size = sizeof(Veth),
  76         .sections = NETDEV_COMMON_SECTIONS "Peer\0",
  77         .done = veth_done,
  78         .fill_message_create = netdev_veth_fill_message_create,
  79         .create_type = NETDEV_CREATE_INDEPENDENT,
  80         .config_verify = netdev_veth_verify,
  81         .iftype = ARPHRD_ETHER,
  82         .generate_mac = true,
  83 };