src/network/networkd-speed-meter.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   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         sd_netlink_message *i;
  48         usec_t usec_now;
  49         Iterator j;
  50         Link *link;
  51         int r;
  52
  53         assert(s);
  54         assert(userdata);
  55
  56         r = sd_event_now(sd_event_source_get_event(s), CLOCK_MONOTONIC, &usec_now);
  57         if (r < 0)
  58                 return r;
  59
  60         r = sd_event_source_set_time(s, usec_now + manager->speed_meter_interval_usec);
  61         if (r < 0)
  62                 return r;
  63
  64         manager->speed_meter_usec_old = manager->speed_meter_usec_new;
  65         manager->speed_meter_usec_new = usec_now;
  66
  67         HASHMAP_FOREACH(link, manager->links, j)
  68                 link->stats_updated = false;
  69
  70         r = sd_rtnl_message_new_link(manager->rtnl, &req, RTM_GETLINK, 0);
  71         if (r < 0) {
  72                 log_warning_errno(r, "Failed to allocate RTM_GETLINK netlink message, ignoring: %m");
  73                 return 0;
  74         }
  75
  76         r = sd_netlink_message_request_dump(req, true);
  77         if (r < 0) {
  78                 log_warning_errno(r, "Failed to set dump flag, ignoring: %m");
  79                 return 0;
  80         }
  81
  82         r = sd_netlink_call(manager->rtnl, req, 0, &reply);
  83         if (r < 0) {
  84                 log_warning_errno(r, "Failed to call RTM_GETLINK, ignoring: %m");
  85                 return 0;
  86         }
  87
  88         for (i = reply; i; i = sd_netlink_message_next(i))
  89                 (void) process_message(manager, i);
  90
  91         return 0;
  92 }
  93
  94 int manager_start_speed_meter(Manager *manager) {
  95         _cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL;
  96         int r;
  97
  98         assert(manager);
  99         assert(manager->event);
 100
 101         if (!manager->use_speed_meter)
 102                 return 0;
 103
 104         r = sd_event_add_time(manager->event, &s, CLOCK_MONOTONIC, 0, 0, speed_meter_handler, manager);
 105         if (r < 0)
 106                 return r;
 107
 108         r = sd_event_source_set_enabled(s, SD_EVENT_ON);
 109         if (r < 0)
 110                 return r;
 111
 112         manager->speed_meter_event_source = TAKE_PTR(s);
 113         return 0;
 114 }