src/network/networkd-wifi.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <net/ethernet.h>
   4 #include <linux/nl80211.h>
   5
   6 #include "sd-bus.h"
   7
   8 #include "bus-util.h"
   9 #include "ether-addr-util.h"
  10 #include "netlink-internal.h"
  11 #include "netlink-util.h"
  12 #include "networkd-link.h"
  13 #include "networkd-manager.h"
  14 #include "networkd-wifi.h"
  15 #include "string-util.h"
  16 #include "wifi-util.h"
  17
  18 int wifi_get_info(Link *link) {
  19         _cleanup_free_ char *ssid = NULL;
  20         enum nl80211_iftype iftype;
  21         const char *type;
  22         int r, s = 0;
  23
  24         assert(link);
  25
  26         if (!link->sd_device)
  27                 return 0;
  28
  29         r = sd_device_get_devtype(link->sd_device, &type);
  30         if (r == -ENOENT)
  31                 return 0;
  32         else if (r < 0)
  33                 return r;
  34
  35         if (!streq(type, "wlan"))
  36                 return 0;
  37
  38         r = wifi_get_interface(link->manager->genl, link->ifindex, &iftype, &ssid);
  39         if (r < 0)
  40                 return r;
  41         if (r > 0 && link->wlan_iftype == iftype && streq_ptr(link->ssid, ssid))
  42                 r = 0;
  43
  44         link->wlan_iftype = iftype;
  45         free_and_replace(link->ssid, ssid);
  46
  47         if (link->wlan_iftype == NL80211_IFTYPE_STATION) {
  48                 struct ether_addr old_bssid = link->bssid;
  49
  50                 s = wifi_get_station(link->manager->genl, link->ifindex, &link->bssid);
  51                 if (s < 0)
  52                         return s;
  53                 if (s > 0 && memcmp(&old_bssid, &link->bssid, sizeof old_bssid) == 0)
  54                         s = 0;
  55         }
  56
  57         if (r > 0 || s > 0) {
  58                 char buf[ETHER_ADDR_TO_STRING_MAX];
  59
  60                 if (link->wlan_iftype == NL80211_IFTYPE_STATION && link->ssid)
  61                         log_link_info(link, "Connected WiFi access point: %s (%s)",
  62                                       link->ssid, ether_addr_to_string(&link->bssid, buf));
  63
  64                 return 1; /* Some information is updated. */
  65         }
  66
  67         return 0; /* No new information. */
  68 }