src/network/networkd-speed-meter.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <errno.h>
   4
   5 #include "sd-event.h"
   6 #include "sd-netlink.h"
   7
   8 #include "networkd-link-bus.h"
   9 #include "networkd-link.h"
  10 #include "networkd-manager.h"
  11 #include "networkd-speed-meter.h"
  12
  13 static int process_message(Manager *manager, sd_netlink_message *message) {
  14         uint16_t type;
  15         int ifindex, r;
  16         Link *link;
  17
  18         r = sd_netlink_message_get_type(message, &type);
  19         if (r < 0)
  20                 return r;
  21
  22         if (type != RTM_NEWLINK)
  23                 return 0;
  24
  25         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
  26         if (r < 0)
  27                 return r;
  28
  29         link = hashmap_get(manager->links, INT_TO_PTR(ifindex));
  30         if (!link)
  31                 return -ENODEV;
  32
  33         link->stats_old = link->stats_new;
  34
  35         r = sd_netlink_message_read(message, IFLA_STATS64, sizeof link->stats_new, &link->stats_new);
  36         if (r < 0)
  37                 return r;
  38
  39         link->stats_updated = true;
  40
  41         return 0;
  42 }
  43
  44 static int speed_meter_handler(sd_event_source *s, uint64_t usec, void *userdata) {
  45         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
  46         Manager *manager = userdata;
  47         usec_t usec_now;
  48         Link *link;
  49         int r;
  50
  51         assert(s);
  52         assert(userdata);
  53
  54         r = sd_event_now(sd_event_source_get_event(s), CLOCK_MONOTONIC, &usec_now);
  55         if (r < 0)
  56                 return r;
  57
  58         r = sd_event_source_set_time(s, usec_now + manager->speed_meter_interval_usec);
  59         if (r < 0)
  60                 return r;
  61
  62         manager->speed_meter_usec_old = manager->speed_meter_usec_new;
  63         manager->speed_meter_usec_new = usec_now;
  64
  65         HASHMAP_FOREACH(link, manager->links)
  66                 link->stats_updated = false;
  67
  68         r = sd_rtnl_message_new_link(manager->rtnl, &req, RTM_GETLINK, 0);
  69         if (r < 0) {
  70                 log_warning_errno(r, "Failed to allocate RTM_GETLINK netlink message, ignoring: %m");
  71                 return 0;
  72         }
  73
  74         r = sd_netlink_message_request_dump(req, true);
  75         if (r < 0) {
  76                 log_warning_errno(r, "Failed to set dump flag, ignoring: %m");
  77                 return 0;
  78         }
  79
  80         r = sd_netlink_call(manager->rtnl, req, 0, &reply);
  81         if (r < 0) {
  82                 log_warning_errno(r, "Failed to call RTM_GETLINK, ignoring: %m");
  83                 return 0;
  84         }
  85
  86         for (sd_netlink_message *i = reply; i; i = sd_netlink_message_next(i))
  87                 (void) process_message(manager, i);
  88
  89         return 0;
  90 }
  91
  92 int manager_start_speed_meter(Manager *manager) {
  93         _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL;
  94         int r;
  95
  96         assert(manager);
  97         assert(manager->event);
  98
  99         if (!manager->use_speed_meter)
 100                 return 0;
 101
 102         r = sd_event_add_time(manager->event, &s, CLOCK_MONOTONIC, 0, 0, speed_meter_handler, manager);
 103         if (r < 0)
 104                 return r;
 105
 106         r = sd_event_source_set_enabled(s, SD_EVENT_ON);
 107         if (r < 0)
 108                 return r;
 109
 110         manager->speed_meter_event_source = TAKE_PTR(s);
 111         return 0;
 112 }