src/network/netdev/bareudp.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later
   2  * Copyright © 2020 VMware, Inc. */
   3
   4 #include "bareudp.h"
   5 #include "netlink-util.h"
   6 #include "networkd-manager.h"
   7 #include "string-table.h"
   8
   9 static const char* const bare_udp_protocol_table[_BARE_UDP_PROTOCOL_MAX] = {
  10         [BARE_UDP_PROTOCOL_IPV4]    = "ipv4",
  11         [BARE_UDP_PROTOCOL_IPV6]    = "ipv6",
  12         [BARE_UDP_PROTOCOL_MPLS_UC] = "mpls-uc",
  13         [BARE_UDP_PROTOCOL_MPLS_MC] = "mpls-mc",
  14 };
  15
  16 DEFINE_STRING_TABLE_LOOKUP(bare_udp_protocol, BareUDPProtocol);
  17 DEFINE_CONFIG_PARSE_ENUM(config_parse_bare_udp_iftype, bare_udp_protocol, BareUDPProtocol,
  18                          "Failed to parse EtherType=");
  19
  20 /* callback for bareudp netdev's created without a backing Link */
  21 static int bare_udp_netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
  22         int r;
  23
  24         assert(netdev);
  25         assert(netdev->state != _NETDEV_STATE_INVALID);
  26
  27         r = sd_netlink_message_get_errno(m);
  28         if (r == -EEXIST)
  29                 log_netdev_info(netdev, "BareUDP netdev exists, using existing without changing its parameters.");
  30         else if (r < 0) {
  31                 log_netdev_warning_errno(netdev, r, "BareUDP netdev could not be created: %m");
  32                 netdev_drop(netdev);
  33
  34                 return 1;
  35         }
  36
  37         log_netdev_debug(netdev, "BareUDP created.");
  38
  39         return 1;
  40 }
  41
  42 static int netdev_bare_udp_create(NetDev *netdev) {
  43         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
  44         BareUDP *u;
  45         int r;
  46
  47         assert(netdev);
  48
  49         u = BAREUDP(netdev);
  50
  51         assert(u);
  52
  53         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
  54         if (r < 0)
  55                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
  56
  57         r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
  58         if (r < 0)
  59                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
  60
  61         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
  62         if (r < 0)
  63                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
  64
  65         r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
  66         if (r < 0)
  67                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
  68
  69         r = sd_netlink_message_append_u16(m, IFLA_BAREUDP_ETHERTYPE, htobe16(u->iftype));
  70         if (r < 0)
  71                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_BAREUDP_ETHERTYPE attribute: %m");
  72
  73         r = sd_netlink_message_append_u16(m, IFLA_BAREUDP_PORT, htobe16(u->dest_port));
  74         if (r < 0)
  75                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_BAREUDP_PORT attribute: %m");
  76
  77         r = sd_netlink_message_close_container(m);
  78         if (r < 0)
  79                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
  80
  81         r = sd_netlink_message_close_container(m);
  82         if (r < 0)
  83                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
  84
  85         r = netlink_call_async(netdev->manager->rtnl, NULL, m, bare_udp_netdev_create_handler,
  86                                netdev_destroy_callback, netdev);
  87         if (r < 0)
  88                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
  89
  90         netdev_ref(netdev);
  91         netdev->state = NETDEV_STATE_CREATING;
  92
  93         log_netdev_debug(netdev, "Creating");
  94
  95         return r;
  96 }
  97
  98 static int netdev_bare_udp_verify(NetDev *netdev, const char *filename) {
  99         BareUDP *u;
 100
 101         assert(netdev);
 102         assert(filename);
 103
 104         u = BAREUDP(netdev);
 105
 106         assert(u);
 107
 108         if (u->dest_port == 0)
 109                 return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 110                                                 "%s: BareUDP DesinationPort= is not set. Ignoring.", filename);
 111
 112         if (u->iftype == _BARE_UDP_PROTOCOL_INVALID)
 113                 return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 114                                                 "%s: BareUDP EtherType= is not set. Ignoring.", filename);
 115
 116         return 0;
 117 }
 118
 119 static void bare_udp_init(NetDev *netdev) {
 120         BareUDP *u;
 121
 122         assert(netdev);
 123
 124         u = BAREUDP(netdev);
 125
 126         assert(u);
 127
 128         u->iftype = _BARE_UDP_PROTOCOL_INVALID;
 129 }
 130
 131 const NetDevVTable bare_udp_vtable = {
 132         .object_size = sizeof(BareUDP),
 133         .sections = NETDEV_COMMON_SECTIONS "BareUDP\0",
 134         .init = bare_udp_init,
 135         .config_verify = netdev_bare_udp_verify,
 136         .create = netdev_bare_udp_create,
 137         .create_type = NETDEV_CREATE_INDEPENDENT,
 138 };