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RNR: Add data from neighbor database

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Include data from the existing neighbor database in the Reduced Neighbor
Report element in Beacon frames if the configuration option 'rnr' is
enabled for the BSS.

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Muna Sinada <msinada@codeaurora.org>
Co-developed-by: Aloka Dixit <alokad@codeaurora.org>
Signed-off-by: Aloka Dixit <alokad@codeaurora.org>
This commit is contained in:
John Crispin 2021-07-27 16:42:20 -07:00 committed by Jouni Malinen
parent 847f76760a
commit a7c152d6b8
2 changed files with 127 additions and 0 deletions
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125
src/ap/ieee802_11.c
View file

@ -7071,4 +7071,129 @@ u8 * hostapd_eid_wb_chsw_wrapper(struct hostapd_data *hapd, u8 *eid)
return eid;
}
static size_t hostapd_eid_nr_db_len(struct hostapd_data *hapd,
size_t *current_len)
{
struct hostapd_neighbor_entry *nr;
size_t total_len = 0, len = *current_len;
dl_list_for_each(nr, &hapd->nr_db, struct hostapd_neighbor_entry,
list) {
if (!nr->nr || wpabuf_len(nr->nr) < 12)
continue;
if (nr->short_ssid == hapd->conf->ssid.short_ssid)
continue;
/* Start a new element */
if (!len ||
len + RNR_TBTT_HEADER_LEN + RNR_TBTT_INFO_LEN > 255) {
len = RNR_HEADER_LEN;
total_len += RNR_HEADER_LEN;
}
len += RNR_TBTT_HEADER_LEN + RNR_TBTT_INFO_LEN;
total_len += RNR_TBTT_HEADER_LEN + RNR_TBTT_INFO_LEN;
}
*current_len = len;
return total_len;
}
size_t hostapd_eid_rnr_len(struct hostapd_data *hapd, u32 type)
{
size_t total_len = 0, current_len = 0;
switch (type) {
case WLAN_FC_STYPE_BEACON:
if (hapd->conf->rnr)
total_len += hostapd_eid_nr_db_len(hapd, &current_len);
break;
default:
break;
}
return total_len;
}
static u8 * hostapd_eid_nr_db(struct hostapd_data *hapd, u8 *eid,
size_t *current_len)
{
struct hostapd_neighbor_entry *nr;
size_t len = *current_len;
u8 *size_offset = (eid - len) + 1;
dl_list_for_each(nr, &hapd->nr_db, struct hostapd_neighbor_entry,
list) {
if (!nr->nr || wpabuf_len(nr->nr) < 12)
continue;
if (nr->short_ssid == hapd->conf->ssid.short_ssid)
continue;
/* Start a new element */
if (!len ||
len + RNR_TBTT_HEADER_LEN + RNR_TBTT_INFO_LEN > 255) {
*eid++ = WLAN_EID_REDUCED_NEIGHBOR_REPORT;
size_offset = eid++;
len = RNR_HEADER_LEN;
}
/* TBTT Information Header subfield (2 octets) */
*eid++ = 0;
/* TBTT Information Length */
*eid++ = RNR_TBTT_INFO_LEN;
/* Operating Class */
*eid++ = wpabuf_head_u8(nr->nr)[10];
/* Channel Number */
*eid++ = wpabuf_head_u8(nr->nr)[11];
len += RNR_TBTT_HEADER_LEN;
/* TBTT Information Set */
/* TBTT Information field */
/* Neighbor AP TBTT Offset */
*eid++ = RNR_NEIGHBOR_AP_OFFSET_UNKNOWN;
/* BSSID */
os_memcpy(eid, nr->bssid, ETH_ALEN);
eid += ETH_ALEN;
/* Short SSID */
os_memcpy(eid, &nr->short_ssid, 4);
eid += 4;
/* BSS parameters */
*eid++ = nr->bss_parameters;
/* 20 MHz PSD */
*eid++ = RNR_20_MHZ_PSD_MAX_TXPOWER - 1;
len += RNR_TBTT_INFO_LEN;
*size_offset = (eid - size_offset) - 1;
}
*current_len = len;
return eid;
}
u8 * hostapd_eid_rnr(struct hostapd_data *hapd, u8 *eid, u32 type)
{
u8 *eid_start = eid;
size_t current_len = 0;
switch (type) {
case WLAN_FC_STYPE_BEACON:
if (hapd->conf->rnr)
eid = hostapd_eid_nr_db(hapd, eid, &current_len);
break;
default:
return eid_start;
}
if (eid == eid_start + 2)
return eid_start;
return eid;
}
#endif /* CONFIG_NATIVE_WINDOWS */

2
src/ap/ieee802_11.h
View file

@ -194,5 +194,7 @@ int get_tx_parameters(struct sta_info *sta, int ap_max_chanwidth,
void auth_sae_process_commit(void *eloop_ctx, void *user_ctx);
u8 * hostapd_eid_rsnxe(struct hostapd_data *hapd, u8 *eid, size_t len);
size_t hostapd_eid_rnr_len(struct hostapd_data *hapd, u32 type);
u8 * hostapd_eid_rnr(struct hostapd_data *hapd, u8 *eid, u32 type);
#endif /* IEEE802_11_H */