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 <netinet/in.h>
   6 #include <linux/if_arp.h>
   7 #include <linux/veth.h>
   8
   9 #include "netlink-util.h"
  10 #include "veth.h"
  11
  12 static int netdev_veth_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *m) {
  13         assert(!link);
  14         assert(m);
  15
  16         struct hw_addr_data hw_addr;
  17         Veth *v = VETH(netdev);
  18         int r;
  19
  20         r = sd_netlink_message_open_container(m, VETH_INFO_PEER);
  21         if (r < 0)
  22                 return r;
  23
  24         if (v->ifname_peer) {
  25                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, v->ifname_peer);
  26                 if (r < 0)
  27                         return r;
  28         }
  29
  30         r = netdev_generate_hw_addr(netdev, NULL, v->ifname_peer, &v->hw_addr_peer, &hw_addr);
  31         if (r < 0)
  32                 return r;
  33
  34         if (hw_addr.length > 0) {
  35                 log_netdev_debug(netdev, "Using MAC address for peer: %s", HW_ADDR_TO_STR(&hw_addr));
  36                 r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
  37                 if (r < 0)
  38                         return r;
  39         }
  40
  41         if (netdev->mtu != 0) {
  42                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
  43                 if (r < 0)
  44                         return r;
  45         }
  46
  47         r = sd_netlink_message_close_container(m);
  48         if (r < 0)
  49                 return r;
  50
  51         return 0;
  52 }
  53
  54 static int netdev_veth_verify(NetDev *netdev, const char *filename) {
  55         assert(filename);
  56
  57         Veth *v = VETH(netdev);
  58
  59         if (!v->ifname_peer)
  60                 return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
  61                                                 "Veth NetDev without peer name configured in %s. Ignoring",
  62                                                 filename);
  63
  64         return 0;
  65 }
  66
  67 static void veth_done(NetDev *netdev) {
  68         Veth *v = VETH(netdev);
  69
  70         free(v->ifname_peer);
  71 }
  72
  73 const NetDevVTable veth_vtable = {
  74         .object_size = sizeof(Veth),
  75         .sections = NETDEV_COMMON_SECTIONS "Peer\0",
  76         .done = veth_done,
  77         .fill_message_create = netdev_veth_fill_message_create,
  78         .create_type = NETDEV_CREATE_INDEPENDENT,
  79         .config_verify = netdev_veth_verify,
  80         .iftype = ARPHRD_ETHER,
  81         .generate_mac = true,
  82 };