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-private.h"
   5 #include "device-util.h"
   6 #include "escape.h"
   7 #include "errno-util.h"
   8 #include "link-config.h"
   9 #include "log.h"
  10 #include "string-util.h"
  11 #include "strv.h"
  12 #include "udev-builtin.h"
  13
  14 static LinkConfigContext *ctx = NULL;
  15
  16 static int builtin_net_setup_link(UdevEvent *event, int argc, char **argv, bool test) {
  17         sd_device *dev = ASSERT_PTR(ASSERT_PTR(event)->dev);
  18         _cleanup_(link_freep) Link *link = NULL;
  19         _cleanup_free_ char *joined = NULL;
  20         int r;
  21
  22         if (argc > 1)
  23                 return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), "This program takes no arguments.");
  24
  25         sd_device_action_t action;
  26         r = sd_device_get_action(dev, &action);
  27         if (r < 0)
  28                 return log_device_error_errno(dev, r, "Failed to get action: %m");
  29
  30         if (!IN_SET(action, SD_DEVICE_ADD, SD_DEVICE_BIND, SD_DEVICE_MOVE)) {
  31                 log_device_debug(dev, "Skipping to apply .link settings on '%s' uevent.",
  32                                  device_action_to_string(action));
  33
  34                 /* Import previously assigned .link file name. */
  35                 (void) udev_builtin_import_property(dev, event->dev_db_clone, test, "ID_NET_LINK_FILE");
  36                 (void) udev_builtin_import_property(dev, event->dev_db_clone, test, "ID_NET_LINK_FILE_DROPINS");
  37
  38                 /* Set ID_NET_NAME= with the current interface name. */
  39                 const char *value;
  40                 if (sd_device_get_sysname(dev, &value) >= 0)
  41                         (void) udev_builtin_add_property(dev, test, "ID_NET_NAME", value);
  42
  43                 return 0;
  44         }
  45
  46         r = link_new(ctx, &event->rtnl, dev, &link);
  47         if (r == -ENODEV) {
  48                 log_device_debug_errno(dev, r, "Link vanished while getting information, ignoring.");
  49                 return 0;
  50         }
  51         if (r < 0)
  52                 return log_device_warning_errno(dev, r, "Failed to get link information: %m");
  53
  54         r = link_get_config(ctx, link);
  55         if (r < 0) {
  56                 if (r == -ENOENT) {
  57                         log_device_debug_errno(dev, r, "No matching link configuration found, ignoring device.");
  58                         return 0;
  59                 }
  60
  61                 return log_device_error_errno(dev, r, "Failed to get link config: %m");
  62         }
  63
  64         r = link_apply_config(ctx, &event->rtnl, link);
  65         if (r == -ENODEV)
  66                 log_device_debug_errno(dev, r, "Link vanished while applying configuration, ignoring.");
  67         else if (r < 0)
  68                 log_device_warning_errno(dev, r, "Could not apply link configuration, ignoring: %m");
  69
  70         udev_builtin_add_property(dev, test, "ID_NET_LINK_FILE", link->config->filename);
  71         if (link->new_name)
  72                 udev_builtin_add_property(dev, test, "ID_NET_NAME", link->new_name);
  73
  74         event->altnames = TAKE_PTR(link->altnames);
  75
  76         STRV_FOREACH(d, link->config->dropins) {
  77                 _cleanup_free_ char *escaped = NULL;
  78
  79                 escaped = xescape(*d, ":");
  80                 if (!escaped)
  81                         return log_oom();
  82
  83                 if (!strextend_with_separator(&joined, ":", escaped))
  84                         return log_oom();
  85         }
  86
  87         udev_builtin_add_property(dev, test, "ID_NET_LINK_FILE_DROPINS", joined);
  88
  89         return 0;
  90 }
  91
  92 static int builtin_net_setup_link_init(void) {
  93         int r;
  94
  95         if (ctx)
  96                 return 0;
  97
  98         r = link_config_ctx_new(&ctx);
  99         if (r < 0)
 100                 return r;
 101
 102         r = link_config_load(ctx);
 103         if (r < 0)
 104                 return r;
 105
 106         log_debug("Created link configuration context.");
 107         return 0;
 108 }
 109
 110 static void builtin_net_setup_link_exit(void) {
 111         ctx = link_config_ctx_free(ctx);
 112         log_debug("Unloaded link configuration context.");
 113 }
 114
 115 static bool builtin_net_setup_link_should_reload(void) {
 116         if (!ctx)
 117                 return false;
 118
 119         if (link_config_should_reload(ctx)) {
 120                 log_debug("Link configuration context needs reloading.");
 121                 return true;
 122         }
 123
 124         return false;
 125 }
 126
 127 const UdevBuiltin udev_builtin_net_setup_link = {
 128         .name = "net_setup_link",
 129         .cmd = builtin_net_setup_link,
 130         .init = builtin_net_setup_link_init,
 131         .exit = builtin_net_setup_link_exit,
 132         .should_reload = builtin_net_setup_link_should_reload,
 133         .help = "Configure network link",
 134         .run_once = false,
 135 };