src/networkd/devmon.c

   1 /*#############################################################################
   2 #                                                                             #
   3 # IPFire.org - A linux based firewall                                         #
   4 # Copyright (C) 2023 IPFire Network Development Team                          #
   5 #                                                                             #
   6 # This program is free software: you can redistribute it and/or modify        #
   7 # it under the terms of the GNU General Public License as published by        #
   8 # the Free Software Foundation, either version 3 of the License, or           #
   9 # (at your option) any later version.                                         #
  10 #                                                                             #
  11 # This program is distributed in the hope that it will be useful,             #
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  14 # GNU General Public License for more details.                                #
  15 #                                                                             #
  16 # You should have received a copy of the GNU General Public License           #
  17 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  18 #                                                                             #
  19 #############################################################################*/
  20
  21 #include <systemd/sd-device.h>
  22
  23 #include "daemon.h"
  24 #include "devmon.h"
  25 #include "logging.h"
  26
  27 static int nw_daemon_handle_uevent_net(nw_daemon* daemon,
  28                 sd_device* device, sd_device_action_t action) {
  29         nw_link* link = NULL;
  30         int ifindex;
  31         int r;
  32
  33         // Fetch ifindex
  34         r = sd_device_get_ifindex(device, &ifindex);
  35         if (r < 0) {
  36                 ERROR("Could not get ifindex from uevent: %s\n", strerror(-r));
  37                 goto ERROR;
  38         }
  39
  40         // Fetch the link
  41         link = nw_daemon_get_link_by_ifindex(daemon, ifindex);
  42         if (!link) {
  43                 DEBUG("Could not fetch link %d, ignoring\n", ifindex);
  44                 r = 0;
  45                 goto ERROR;
  46         }
  47
  48         // Let the link handle its uevent
  49         r = nw_link_handle_uevent(link, device, action);
  50
  51 ERROR:
  52         if (link)
  53                 nw_link_unref(link);
  54
  55         return r;
  56 }
  57
  58 int nw_devmon_handle_uevent(sd_device_monitor* monitor, sd_device* device, void* data) {
  59         sd_device_action_t action;
  60         const char* subsystem = NULL;
  61         int r;
  62
  63         // Fetch daemon
  64         nw_daemon* daemon = (nw_daemon*)data;
  65
  66         // Fetch action
  67         r = sd_device_get_action(device, &action);
  68         if (r < 0) {
  69                 WARNING("Could not get uevent action, ignoring: %s\n", strerror(-r));
  70                 return r;
  71         }
  72
  73         // Fetch subsystem
  74         r = sd_device_get_subsystem(device, &subsystem);
  75         if (r < 0) {
  76                 ERROR("Could not get uevent subsystem, ignoring: %s\n", strerror(-r));
  77                 return r;
  78         }
  79
  80         // Handle any links
  81         if (strcmp(subsystem, "net") == 0) {
  82                 r = nw_daemon_handle_uevent_net(daemon, device, action);
  83
  84         } else {
  85                 DEBUG("Received an uevent for an unhandled subsystem '%s', ignoring\n", subsystem);
  86                 return 0;
  87         }
  88
  89         // Log if something went wrong
  90         if (r < 0)
  91                 ERROR("Failed processing uevent: %s\n", strerror(-r));
  92
  93         return 0;
  94 }