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      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 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 ||
     27 		     (ssid->ssid_len == nr->ssid.ssid_len &&
     28 		      os_memcmp(ssid->ssid, nr->ssid.ssid,
     29 				ssid->ssid_len) == 0)))
     30 			return nr;
     31 	}
     32 	return NULL;
     33 }
     34 
     35 
     36 static void hostapd_neighbor_clear_entry(struct hostapd_neighbor_entry *nr)
     37 {
     38 	wpabuf_free(nr->nr);
     39 	nr->nr = NULL;
     40 	wpabuf_free(nr->lci);
     41 	nr->lci = NULL;
     42 	wpabuf_free(nr->civic);
     43 	nr->civic = NULL;
     44 	os_memset(nr->bssid, 0, sizeof(nr->bssid));
     45 	os_memset(&nr->ssid, 0, sizeof(nr->ssid));
     46 	nr->stationary = 0;
     47 }
     48 
     49 
     50 static struct hostapd_neighbor_entry *
     51 hostapd_neighbor_add(struct hostapd_data *hapd)
     52 {
     53 	struct hostapd_neighbor_entry *nr;
     54 
     55 	nr = os_zalloc(sizeof(struct hostapd_neighbor_entry));
     56 	if (!nr)
     57 		return NULL;
     58 
     59 	dl_list_add(&hapd->nr_db, &nr->list);
     60 
     61 	return nr;
     62 }
     63 
     64 
     65 int hostapd_neighbor_set(struct hostapd_data *hapd, const u8 *bssid,
     66 			 const struct wpa_ssid_value *ssid,
     67 			 const struct wpabuf *nr, const struct wpabuf *lci,
     68 			 const struct wpabuf *civic, int stationary)
     69 {
     70 	struct hostapd_neighbor_entry *entry;
     71 
     72 	entry = hostapd_neighbor_get(hapd, bssid, ssid);
     73 	if (!entry)
     74 		entry = hostapd_neighbor_add(hapd);
     75 	if (!entry)
     76 		return -1;
     77 
     78 	hostapd_neighbor_clear_entry(entry);
     79 
     80 	os_memcpy(entry->bssid, bssid, ETH_ALEN);
     81 	os_memcpy(&entry->ssid, ssid, sizeof(entry->ssid));
     82 
     83 	entry->nr = wpabuf_dup(nr);
     84 	if (!entry->nr)
     85 		goto fail;
     86 
     87 	if (lci && wpabuf_len(lci)) {
     88 		entry->lci = wpabuf_dup(lci);
     89 		if (!entry->lci || os_get_time(&entry->lci_date))
     90 			goto fail;
     91 	}
     92 
     93 	if (civic && wpabuf_len(civic)) {
     94 		entry->civic = wpabuf_dup(civic);
     95 		if (!entry->civic)
     96 			goto fail;
     97 	}
     98 
     99 	entry->stationary = stationary;
    100 
    101 	return 0;
    102 
    103 fail:
    104 	hostapd_neighbor_remove(hapd, bssid, ssid);
    105 	return -1;
    106 }
    107 
    108 
    109 int hostapd_neighbor_remove(struct hostapd_data *hapd, const u8 *bssid,
    110 			    const struct wpa_ssid_value *ssid)
    111 {
    112 	struct hostapd_neighbor_entry *nr;
    113 
    114 	nr = hostapd_neighbor_get(hapd, bssid, ssid);
    115 	if (!nr)
    116 		return -1;
    117 
    118 	hostapd_neighbor_clear_entry(nr);
    119 	dl_list_del(&nr->list);
    120 	os_free(nr);
    121 
    122 	return 0;
    123 }
    124 
    125 
    126 void hostpad_free_neighbor_db(struct hostapd_data *hapd)
    127 {
    128 	struct hostapd_neighbor_entry *nr, *prev;
    129 
    130 	dl_list_for_each_safe(nr, prev, &hapd->nr_db,
    131 			      struct hostapd_neighbor_entry, list) {
    132 		hostapd_neighbor_clear_entry(nr);
    133 		dl_list_del(&nr->list);
    134 		os_free(nr);
    135 	}
    136 }
    137