src/ap/neighbor_db.c

   1 /*
   2  * hostapd / Neighboring APs DB
   3  * Copyright(c) 2013 - 2016 Intel Mobile Communications GmbH.
   4  * Copyright(c) 2011 - 2016 Intel Corporation. All rights reserved.
   5  *
   6  * This software may be distributed under the terms of the BSD license.
   7  * See README for more details.
   8  */
   9
  10 #include "utils/includes.h"
  11
  12 #include "utils/common.h"
  13 #include "hostapd.h"
  14 #include "neighbor_db.h"
  15
  16
  17 static struct hostapd_neighbor_entry *
  18 hostapd_neighbor_get(struct hostapd_data *hapd, const u8 *bssid,
  19                      const struct wpa_ssid_value *ssid)
  20 {
  21         struct hostapd_neighbor_entry *nr;
  22
  23         dl_list_for_each(nr, &hapd->nr_db, struct hostapd_neighbor_entry,
  24                          list) {
  25                 if (os_memcmp(bssid, nr->bssid, ETH_ALEN) == 0 &&
  26                     ssid->ssid_len == nr->ssid.ssid_len &&
  27                     os_memcmp(ssid->ssid, nr->ssid.ssid, ssid->ssid_len) == 0)
  28                         return nr;
  29         }
  30         return NULL;
  31 }
  32
  33
  34 static void hostapd_neighbor_clear_entry(struct hostapd_neighbor_entry *nr)
  35 {
  36         wpabuf_free(nr->nr);
  37         nr->nr = NULL;
  38         wpabuf_free(nr->lci);
  39         nr->lci = NULL;
  40         wpabuf_free(nr->civic);
  41         nr->civic = NULL;
  42         os_memset(nr->bssid, 0, sizeof(nr->bssid));
  43         os_memset(&nr->ssid, 0, sizeof(nr->ssid));
  44 }
  45
  46
  47 static struct hostapd_neighbor_entry *
  48 hostapd_neighbor_add(struct hostapd_data *hapd)
  49 {
  50         struct hostapd_neighbor_entry *nr;
  51
  52         nr = os_zalloc(sizeof(struct hostapd_neighbor_entry));
  53         if (!nr)
  54                 return NULL;
  55
  56         dl_list_add(&hapd->nr_db, &nr->list);
  57
  58         return nr;
  59 }
  60
  61
  62 int hostapd_neighbor_set(struct hostapd_data *hapd, const u8 *bssid,
  63                          const struct wpa_ssid_value *ssid,
  64                          const struct wpabuf *nr, const struct wpabuf *lci,
  65                          const struct wpabuf *civic)
  66 {
  67         struct hostapd_neighbor_entry *entry;
  68
  69         entry = hostapd_neighbor_get(hapd, bssid, ssid);
  70         if (!entry)
  71                 entry = hostapd_neighbor_add(hapd);
  72         if (!entry)
  73                 return -1;
  74
  75         hostapd_neighbor_clear_entry(entry);
  76
  77         os_memcpy(entry->bssid, bssid, ETH_ALEN);
  78         os_memcpy(&entry->ssid, ssid, sizeof(entry->ssid));
  79
  80         entry->nr = wpabuf_dup(nr);
  81         if (!entry->nr)
  82                 goto fail;
  83
  84         if (lci) {
  85                 entry->lci = wpabuf_dup(lci);
  86                 if (!entry->lci || os_get_time(&entry->lci_date))
  87                         goto fail;
  88         }
  89
  90         if (civic) {
  91                 entry->civic = wpabuf_dup(civic);
  92                 if (!entry->civic)
  93                         goto fail;
  94         }
  95
  96         return 0;
  97
  98 fail:
  99         hostapd_neighbor_remove(hapd, bssid, ssid);
 100         return -1;
 101 }
 102
 103
 104 int hostapd_neighbor_remove(struct hostapd_data *hapd, const u8 *bssid,
 105                             const struct wpa_ssid_value *ssid)
 106 {
 107         struct hostapd_neighbor_entry *nr;
 108
 109         nr = hostapd_neighbor_get(hapd, bssid, ssid);
 110         if (!nr)
 111                 return -1;
 112
 113         hostapd_neighbor_clear_entry(nr);
 114         dl_list_del(&nr->list);
 115         os_free(nr);
 116
 117         return 0;
 118 }
 119
 120
 121 void hostpad_free_neighbor_db(struct hostapd_data *hapd)
 122 {
 123         struct hostapd_neighbor_entry *nr, *prev;
 124
 125         dl_list_for_each_safe(nr, prev, &hapd->nr_db,
 126                               struct hostapd_neighbor_entry, list) {
 127                 hostapd_neighbor_clear_entry(nr);
 128                 dl_list_del(&nr->list);
 129                 os_free(nr);
 130         }
 131 }