aboutsummaryrefslogtreecommitdiffstats
path: root/src/ap/taxonomy.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/ap/taxonomy.c')
-rw-r--r--src/ap/taxonomy.c282
1 files changed, 282 insertions, 0 deletions
diff --git a/src/ap/taxonomy.c b/src/ap/taxonomy.c
new file mode 100644
index 0000000..e533a10
--- /dev/null
+++ b/src/ap/taxonomy.c
@@ -0,0 +1,282 @@
+/*
+ * hostapd / Client taxonomy
+ * Copyright (c) 2015 Google, Inc.
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ *
+ * Parse a series of IEs, as in Probe Request or (Re)Association Request frames,
+ * and render them to a descriptive string. The tag number of standard options
+ * is written to the string, while the vendor ID and subtag are written for
+ * vendor options.
+ *
+ * Example strings:
+ * 0,1,50,45,221(00904c,51)
+ * 0,1,33,36,48,45,221(00904c,51),221(0050f2,2)
+ */
+
+#include "utils/includes.h"
+
+#include "utils/common.h"
+#include "common/wpa_ctrl.h"
+#include "hostapd.h"
+#include "sta_info.h"
+
+
+/* Copy a string with no funny schtuff allowed; only alphanumerics. */
+static void no_mischief_strncpy(char *dst, const char *src, size_t n)
+{
+ size_t i;
+
+ for (i = 0; i < n; i++) {
+ unsigned char s = src[i];
+ int is_lower = s >= 'a' && s <= 'z';
+ int is_upper = s >= 'A' && s <= 'Z';
+ int is_digit = s >= '0' && s <= '9';
+
+ if (is_lower || is_upper || is_digit) {
+ /* TODO: if any manufacturer uses Unicode within the
+ * WPS header, it will get mangled here. */
+ dst[i] = s;
+ } else {
+ /* Note that even spaces will be transformed to
+ * underscores, so 'Nexus 7' will turn into 'Nexus_7'.
+ * This is deliberate, to make the string easier to
+ * parse. */
+ dst[i] = '_';
+ }
+ }
+}
+
+
+static int get_wps_name(char *name, size_t name_len,
+ const u8 *data, size_t data_len)
+{
+ /* Inside the WPS IE are a series of attributes, using two byte IDs
+ * and two byte lengths. We're looking for the model name, if
+ * present. */
+ while (data_len >= 4) {
+ u16 id, elen;
+
+ id = WPA_GET_BE16(data);
+ elen = WPA_GET_BE16(data + 2);
+ data += 4;
+ data_len -= 4;
+
+ if (elen > data_len)
+ return 0;
+
+ if (id == 0x1023) {
+ /* Model name, like 'Nexus 7' */
+ size_t n = (elen < name_len) ? elen : name_len;
+ no_mischief_strncpy(name, (const char *) data, n);
+ return n;
+ }
+
+ data += elen;
+ data_len -= elen;
+ }
+
+ return 0;
+}
+
+
+static void ie_to_string(char *fstr, size_t fstr_len, const struct wpabuf *ies)
+{
+ char *fpos = fstr;
+ char *fend = fstr + fstr_len;
+ char htcap[7 + 4 + 1]; /* ",htcap:" + %04hx + trailing NUL */
+ char htagg[7 + 2 + 1]; /* ",htagg:" + %02hx + trailing NUL */
+ char htmcs[7 + 8 + 1]; /* ",htmcs:" + %08x + trailing NUL */
+ char vhtcap[8 + 8 + 1]; /* ",vhtcap:" + %08x + trailing NUL */
+ char vhtrxmcs[10 + 8 + 1]; /* ",vhtrxmcs:" + %08x + trailing NUL */
+ char vhttxmcs[10 + 8 + 1]; /* ",vhttxmcs:" + %08x + trailing NUL */
+#define MAX_EXTCAP 254
+ char extcap[8 + 2 * MAX_EXTCAP + 1]; /* ",extcap:" + hex + trailing NUL
+ */
+ char txpow[7 + 4 + 1]; /* ",txpow:" + %04hx + trailing NUL */
+#define WPS_NAME_LEN 32
+ char wps[WPS_NAME_LEN + 5 + 1]; /* room to prepend ",wps:" + trailing
+ * NUL */
+ int num = 0;
+ const u8 *ie;
+ size_t ie_len;
+ int ret;
+
+ os_memset(htcap, 0, sizeof(htcap));
+ os_memset(htagg, 0, sizeof(htagg));
+ os_memset(htmcs, 0, sizeof(htmcs));
+ os_memset(vhtcap, 0, sizeof(vhtcap));
+ os_memset(vhtrxmcs, 0, sizeof(vhtrxmcs));
+ os_memset(vhttxmcs, 0, sizeof(vhttxmcs));
+ os_memset(extcap, 0, sizeof(extcap));
+ os_memset(txpow, 0, sizeof(txpow));
+ os_memset(wps, 0, sizeof(wps));
+ *fpos = '\0';
+
+ if (!ies)
+ return;
+ ie = wpabuf_head(ies);
+ ie_len = wpabuf_len(ies);
+
+ while (ie_len >= 2) {
+ u8 id, elen;
+ char *sep = (num++ == 0) ? "" : ",";
+
+ id = *ie++;
+ elen = *ie++;
+ ie_len -= 2;
+
+ if (elen > ie_len)
+ break;
+
+ if (id == WLAN_EID_VENDOR_SPECIFIC && elen >= 4) {
+ /* Vendor specific */
+ if (WPA_GET_BE32(ie) == WPS_IE_VENDOR_TYPE) {
+ /* WPS */
+ char model_name[WPS_NAME_LEN + 1];
+ const u8 *data = &ie[4];
+ size_t data_len = elen - 4;
+
+ os_memset(model_name, 0, sizeof(model_name));
+ if (get_wps_name(model_name, WPS_NAME_LEN, data,
+ data_len)) {
+ os_snprintf(wps, sizeof(wps),
+ ",wps:%s", model_name);
+ }
+ }
+
+ ret = os_snprintf(fpos, fend - fpos,
+ "%s%d(%02x%02x%02x,%d)",
+ sep, id, ie[0], ie[1], ie[2], ie[3]);
+ } else {
+ if (id == WLAN_EID_HT_CAP && elen >= 2) {
+ /* HT Capabilities (802.11n) */
+ os_snprintf(htcap, sizeof(htcap),
+ ",htcap:%04hx",
+ WPA_GET_LE16(ie));
+ }
+ if (id == WLAN_EID_HT_CAP && elen >= 3) {
+ /* HT Capabilities (802.11n), A-MPDU information
+ */
+ os_snprintf(htagg, sizeof(htagg),
+ ",htagg:%02hx", (u16) ie[2]);
+ }
+ if (id == WLAN_EID_HT_CAP && elen >= 7) {
+ /* HT Capabilities (802.11n), MCS information */
+ os_snprintf(htmcs, sizeof(htmcs),
+ ",htmcs:%08hx",
+ (u16) WPA_GET_LE32(ie + 3));
+ }
+ if (id == WLAN_EID_VHT_CAP && elen >= 4) {
+ /* VHT Capabilities (802.11ac) */
+ os_snprintf(vhtcap, sizeof(vhtcap),
+ ",vhtcap:%08x",
+ WPA_GET_LE32(ie));
+ }
+ if (id == WLAN_EID_VHT_CAP && elen >= 8) {
+ /* VHT Capabilities (802.11ac), RX MCS
+ * information */
+ os_snprintf(vhtrxmcs, sizeof(vhtrxmcs),
+ ",vhtrxmcs:%08x",
+ WPA_GET_LE32(ie + 4));
+ }
+ if (id == WLAN_EID_VHT_CAP && elen >= 12) {
+ /* VHT Capabilities (802.11ac), TX MCS
+ * information */
+ os_snprintf(vhttxmcs, sizeof(vhttxmcs),
+ ",vhttxmcs:%08x",
+ WPA_GET_LE32(ie + 8));
+ }
+ if (id == WLAN_EID_EXT_CAPAB) {
+ /* Extended Capabilities */
+ int i;
+ int len = (elen < MAX_EXTCAP) ? elen :
+ MAX_EXTCAP;
+ char *p = extcap;
+
+ p += os_snprintf(extcap, sizeof(extcap),
+ ",extcap:");
+ for (i = 0; i < len; i++) {
+ int lim;
+
+ lim = sizeof(extcap) -
+ os_strlen(extcap);
+ if (lim <= 0)
+ break;
+ p += os_snprintf(p, lim, "%02x",
+ *(ie + i));
+ }
+ }
+ if (id == WLAN_EID_PWR_CAPABILITY && elen == 2) {
+ /* TX Power */
+ os_snprintf(txpow, sizeof(txpow),
+ ",txpow:%04hx",
+ WPA_GET_LE16(ie));
+ }
+
+ ret = os_snprintf(fpos, fend - fpos, "%s%d", sep, id);
+ }
+ if (os_snprintf_error(fend - fpos, ret))
+ goto fail;
+ fpos += ret;
+
+ ie += elen;
+ ie_len -= elen;
+ }
+
+ ret = os_snprintf(fpos, fend - fpos, "%s%s%s%s%s%s%s%s%s",
+ htcap, htagg, htmcs, vhtcap, vhtrxmcs, vhttxmcs,
+ txpow, extcap, wps);
+ if (os_snprintf_error(fend - fpos, ret)) {
+ fail:
+ fstr[0] = '\0';
+ }
+}
+
+
+int retrieve_sta_taxonomy(const struct hostapd_data *hapd,
+ struct sta_info *sta, char *buf, size_t buflen)
+{
+ int ret;
+ char *pos, *end;
+
+ if (!sta->probe_ie_taxonomy || !sta->assoc_ie_taxonomy)
+ return 0;
+
+ ret = os_snprintf(buf, buflen, "wifi4|probe:");
+ if (os_snprintf_error(buflen, ret))
+ return 0;
+ pos = buf + ret;
+ end = buf + buflen;
+
+ ie_to_string(pos, end - pos, sta->probe_ie_taxonomy);
+ pos = os_strchr(pos, '\0');
+ if (pos >= end)
+ return 0;
+ ret = os_snprintf(pos, end - pos, "|assoc:");
+ if (os_snprintf_error(end - pos, ret))
+ return 0;
+ pos += ret;
+ ie_to_string(pos, end - pos, sta->assoc_ie_taxonomy);
+ pos = os_strchr(pos, '\0');
+ return pos - buf;
+}
+
+
+void taxonomy_sta_info_probe_req(const struct hostapd_data *hapd,
+ struct sta_info *sta,
+ const u8 *ie, size_t ie_len)
+{
+ wpabuf_free(sta->probe_ie_taxonomy);
+ sta->probe_ie_taxonomy = wpabuf_alloc_copy(ie, ie_len);
+}
+
+
+void taxonomy_sta_info_assoc_req(const struct hostapd_data *hapd,
+ struct sta_info *sta,
+ const u8 *ie, size_t ie_len)
+{
+ wpabuf_free(sta->assoc_ie_taxonomy);
+ sta->assoc_ie_taxonomy = wpabuf_alloc_copy(ie, ie_len);
+}