src/udev/udev-builtin-net_setup_link.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include "alloc-util.h"
   4 #include "device-util.h"
   5 #include "errno-util.h"
   6 #include "link-config.h"
   7 #include "log.h"
   8 #include "string-util.h"
   9 #include "udev-builtin.h"
  10
  11 static LinkConfigContext *ctx = NULL;
  12
  13 static int builtin_net_setup_link(sd_device *dev, sd_netlink **rtnl, int argc, char **argv, bool test) {
  14         _cleanup_(link_freep) Link *link = NULL;
  15         int r;
  16
  17         if (argc > 1)
  18                 return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), "This program takes no arguments.");
  19
  20         r = link_new(ctx, rtnl, dev, &link);
  21         if (r == -ENODEV) {
  22                 log_device_debug_errno(dev, r, "Link vanished while getting information, ignoring.");
  23                 return 0;
  24         }
  25         if (r < 0)
  26                 return log_device_warning_errno(dev, r, "Failed to get link information: %m");
  27
  28         if (link->driver)
  29                 udev_builtin_add_property(dev, test, "ID_NET_DRIVER", link->driver);
  30
  31         r = link_get_config(ctx, link);
  32         if (r < 0) {
  33                 if (r == -ENOENT) {
  34                         log_device_debug_errno(dev, r, "No matching link configuration found, ignoring device.");
  35                         return 0;
  36                 }
  37
  38                 return log_device_error_errno(dev, r, "Failed to get link config: %m");
  39         }
  40
  41         r = link_apply_config(ctx, rtnl, link);
  42         if (r == -ENODEV)
  43                 log_device_debug_errno(dev, r, "Link vanished while applying configuration, ignoring.");
  44         else if (r < 0)
  45                 log_device_warning_errno(dev, r, "Could not apply link configuration, ignoring: %m");
  46
  47         udev_builtin_add_property(dev, test, "ID_NET_LINK_FILE", link->config->filename);
  48         if (link->new_name)
  49                 udev_builtin_add_property(dev, test, "ID_NET_NAME", link->new_name);
  50
  51         return 0;
  52 }
  53
  54 static int builtin_net_setup_link_init(void) {
  55         int r;
  56
  57         if (ctx)
  58                 return 0;
  59
  60         r = link_config_ctx_new(&ctx);
  61         if (r < 0)
  62                 return r;
  63
  64         r = link_config_load(ctx);
  65         if (r < 0)
  66                 return r;
  67
  68         log_debug("Created link configuration context.");
  69         return 0;
  70 }
  71
  72 static void builtin_net_setup_link_exit(void) {
  73         ctx = link_config_ctx_free(ctx);
  74         log_debug("Unloaded link configuration context.");
  75 }
  76
  77 static bool builtin_net_setup_link_should_reload(void) {
  78         if (!ctx)
  79                 return false;
  80
  81         if (link_config_should_reload(ctx)) {
  82                 log_debug("Link configuration context needs reloading.");
  83                 return true;
  84         }
  85
  86         return false;
  87 }
  88
  89 const UdevBuiltin udev_builtin_net_setup_link = {
  90         .name = "net_setup_link",
  91         .cmd = builtin_net_setup_link,
  92         .init = builtin_net_setup_link_init,
  93         .exit = builtin_net_setup_link_exit,
  94         .should_reload = builtin_net_setup_link_should_reload,
  95         .help = "Configure network link",
  96         .run_once = false,
  97 };