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hostapd: report bssid, ssid and channel over ubus

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Imports a function from iw to convert frequencies to channel numbers.

Co-authored-by: David Bauer <mail@david-bauer.net>
Signed-off-by: Martin Weinelt <hexa@darmstadt.ccc.de>
[fix potential out of bounds read]
Signed-off-by: David Bauer <mail@david-bauer.net>
This commit is contained in:
Martin Weinelt 2021-06-26 00:01:07 +02:00 committed by David Bauer
parent 64ce35bfaf
commit 398df62756
1 changed files with 38 additions and 0 deletions
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38
package/network/services/hostapd/src/src/ap/ubus.c
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@ -372,6 +372,32 @@ hostapd_bss_get_features(struct ubus_context *ctx, struct ubus_object *obj,
return 0; return 0;
} }
/* Imported from iw/util.c
* https://git.kernel.org/pub/scm/linux/kernel/git/jberg/iw.git/tree/util.c?id=4b25ae3537af48dbf9d0abf94132e5ba01b32c18#n200
*/
int ieee80211_frequency_to_channel(int freq)
{
/* see 802.11-2007 17.3.8.3.2 and Annex J */
if (freq == 2484)
return 14;
/* see 802.11ax D6.1 27.3.23.2 and Annex E */
else if (freq == 5935)
return 2;
else if (freq < 2484)
return (freq - 2407) / 5;
else if (freq >= 4910 && freq <= 4980)
return (freq - 4000) / 5;
else if (freq < 5950)
return (freq - 5000) / 5;
else if (freq <= 45000) /* DMG band lower limit */
/* see 802.11ax D6.1 27.3.23.2 */
return (freq - 5950) / 5;
else if (freq >= 58320 && freq <= 70200)
return (freq - 56160) / 2160;
else
return 0;
}
static int static int
hostapd_bss_get_status(struct ubus_context *ctx, struct ubus_object *obj, hostapd_bss_get_status(struct ubus_context *ctx, struct ubus_object *obj,
struct ubus_request_data *req, const char *method, struct ubus_request_data *req, const char *method,
@ -380,12 +406,24 @@ hostapd_bss_get_status(struct ubus_context *ctx, struct ubus_object *obj,
struct hostapd_data *hapd = container_of(obj, struct hostapd_data, ubus.obj); struct hostapd_data *hapd = container_of(obj, struct hostapd_data, ubus.obj);
void *airtime_table, *dfs_table; void *airtime_table, *dfs_table;
struct os_reltime now; struct os_reltime now;
char ssid[SSID_MAX_LEN + 1];
char phy_name[17]; char phy_name[17];
char mac_buf[20]; char mac_buf[20];
size_t ssid_len = SSID_MAX_LEN;
if (hapd->conf->ssid.ssid_len < SSID_MAX_LEN)
ssid_len = hapd->conf->ssid.ssid_len;
blob_buf_init(&b, 0); blob_buf_init(&b, 0);
blobmsg_add_string(&b, "status", hostapd_state_text(hapd->iface->state)); blobmsg_add_string(&b, "status", hostapd_state_text(hapd->iface->state));
blobmsg_printf(&b, "bssid", MACSTR, MAC2STR(hapd->conf->bssid));
memset(ssid, 0, SSID_MAX_LEN + 1);
memcpy(ssid, hapd->conf->ssid.ssid, ssid_len);
blobmsg_add_string(&b, "ssid", ssid);
blobmsg_add_u32(&b, "freq", hapd->iface->freq); blobmsg_add_u32(&b, "freq", hapd->iface->freq);
blobmsg_add_u32(&b, "channel", ieee80211_frequency_to_channel(hapd->iface->freq));
snprintf(phy_name, 17, "%s", hapd->iface->phy); snprintf(phy_name, 17, "%s", hapd->iface->phy);
blobmsg_add_string(&b, "phy", phy_name); blobmsg_add_string(&b, "phy", phy_name);