src/network/netdev/veth.c

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