--- /dev/null
+/* Helpers for managing scan queues
+ *
+ * See copyright notice in main.c
+ */
+
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ieee80211.h>
+#include <net/cfg80211.h>
+
+#include "hermes.h"
+#include "orinoco.h"
+#include "main.h"
+
+#include "scan.h"
+
+#define ZERO_DBM_OFFSET 0x95
+#define MAX_SIGNAL_LEVEL 0x8A
+#define MIN_SIGNAL_LEVEL 0x2F
+
+#define SIGNAL_TO_DBM(x) \
+ (clamp_t(s32, (x), MIN_SIGNAL_LEVEL, MAX_SIGNAL_LEVEL) \
+ - ZERO_DBM_OFFSET)
+#define SIGNAL_TO_MBM(x) (SIGNAL_TO_DBM(x) * 100)
+
+static int symbol_build_supp_rates(u8 *buf, const __le16 *rates)
+{
+ int i;
+ u8 rate;
+
+ buf[0] = WLAN_EID_SUPP_RATES;
+ for (i = 0; i < 5; i++) {
+ rate = le16_to_cpu(rates[i]);
+ /* NULL terminated */
+ if (rate == 0x0)
+ break;
+ buf[i + 2] = rate;
+ }
+ buf[1] = i;
+
+ return i + 2;
+}
+
+static int prism_build_supp_rates(u8 *buf, const u8 *rates)
+{
+ int i;
+
+ buf[0] = WLAN_EID_SUPP_RATES;
+ for (i = 0; i < 8; i++) {
+ /* NULL terminated */
+ if (rates[i] == 0x0)
+ break;
+ buf[i + 2] = rates[i];
+ }
+ buf[1] = i;
+
+ /* We might still have another 2 rates, which need to go in
+ * extended supported rates */
+ if (i == 8 && rates[i] > 0) {
+ buf[10] = WLAN_EID_EXT_SUPP_RATES;
+ for (; i < 10; i++) {
+ /* NULL terminated */
+ if (rates[i] == 0x0)
+ break;
+ buf[i + 2] = rates[i];
+ }
+ buf[11] = i - 8;
+ }
+
+ return (i < 8) ? i + 2 : i + 4;
+}
+
+static void orinoco_add_hostscan_result(struct orinoco_private *priv,
+ const union hermes_scan_info *bss)
+{
+ struct wiphy *wiphy = priv_to_wiphy(priv);
+ struct ieee80211_channel *channel;
+ struct cfg80211_bss *cbss;
+ u8 *ie;
+ u8 ie_buf[46];
+ u64 timestamp;
+ s32 signal;
+ u16 capability;
+ u16 beacon_interval;
+ int ie_len;
+ int freq;
+ int len;
+
+ len = le16_to_cpu(bss->a.essid_len);
+
+ /* Reconstruct SSID and bitrate IEs to pass up */
+ ie_buf[0] = WLAN_EID_SSID;
+ ie_buf[1] = len;
+ memcpy(&ie_buf[2], bss->a.essid, len);
+
+ ie = ie_buf + len + 2;
+ ie_len = ie_buf[1] + 2;
+ switch (priv->firmware_type) {
+ case FIRMWARE_TYPE_SYMBOL:
+ ie_len += symbol_build_supp_rates(ie, bss->s.rates);
+ break;
+
+ case FIRMWARE_TYPE_INTERSIL:
+ ie_len += prism_build_supp_rates(ie, bss->p.rates);
+ break;
+
+ case FIRMWARE_TYPE_AGERE:
+ default:
+ break;
+ }
+
+ freq = ieee80211_channel_to_frequency(
+ le16_to_cpu(bss->a.channel), IEEE80211_BAND_2GHZ);
+ channel = ieee80211_get_channel(wiphy, freq);
+ if (!channel) {
+ printk(KERN_DEBUG "Invalid channel designation %04X(%04X)",
+ bss->a.channel, freq);
+ return; /* Then ignore it for now */
+ }
+ timestamp = 0;
+ capability = le16_to_cpu(bss->a.capabilities);
+ beacon_interval = le16_to_cpu(bss->a.beacon_interv);
+ signal = SIGNAL_TO_MBM(le16_to_cpu(bss->a.level));
+
+ cbss = cfg80211_inform_bss(wiphy, channel, CFG80211_BSS_FTYPE_UNKNOWN,
+ bss->a.bssid, timestamp, capability,
+ beacon_interval, ie_buf, ie_len, signal,
+ GFP_KERNEL);
+ cfg80211_put_bss(wiphy, cbss);
+}
+
+void orinoco_add_extscan_result(struct orinoco_private *priv,
+ struct agere_ext_scan_info *bss,
+ size_t len)
+{
+ struct wiphy *wiphy = priv_to_wiphy(priv);
+ struct ieee80211_channel *channel;
+ struct cfg80211_bss *cbss;
+ const u8 *ie;
+ u64 timestamp;
+ s32 signal;
+ u16 capability;
+ u16 beacon_interval;
+ size_t ie_len;
+ int chan, freq;
+
+ ie_len = len - sizeof(*bss);
+ ie = cfg80211_find_ie(WLAN_EID_DS_PARAMS, bss->data, ie_len);
+ chan = ie ? ie[2] : 0;
+ freq = ieee80211_channel_to_frequency(chan, IEEE80211_BAND_2GHZ);
+ channel = ieee80211_get_channel(wiphy, freq);
+
+ timestamp = le64_to_cpu(bss->timestamp);
+ capability = le16_to_cpu(bss->capabilities);
+ beacon_interval = le16_to_cpu(bss->beacon_interval);
+ ie = bss->data;
+ signal = SIGNAL_TO_MBM(bss->level);
+
+ cbss = cfg80211_inform_bss(wiphy, channel, CFG80211_BSS_FTYPE_UNKNOWN,
+ bss->bssid, timestamp, capability,
+ beacon_interval, ie, ie_len, signal,
+ GFP_KERNEL);
+ cfg80211_put_bss(wiphy, cbss);
+}
+
+void orinoco_add_hostscan_results(struct orinoco_private *priv,
+ unsigned char *buf,
+ size_t len)
+{
+ int offset; /* In the scan data */
+ size_t atom_len;
+ bool abort = false;
+
+ switch (priv->firmware_type) {
+ case FIRMWARE_TYPE_AGERE:
+ atom_len = sizeof(struct agere_scan_apinfo);
+ offset = 0;
+ break;
+
+ case FIRMWARE_TYPE_SYMBOL:
+ /* Lack of documentation necessitates this hack.
+ * Different firmwares have 68 or 76 byte long atoms.
+ * We try modulo first. If the length divides by both,
+ * we check what would be the channel in the second
+ * frame for a 68-byte atom. 76-byte atoms have 0 there.
+ * Valid channel cannot be 0. */
+ if (len % 76)
+ atom_len = 68;
+ else if (len % 68)
+ atom_len = 76;
+ else if (len >= 1292 && buf[68] == 0)
+ atom_len = 76;
+ else
+ atom_len = 68;
+ offset = 0;
+ break;
+
+ case FIRMWARE_TYPE_INTERSIL:
+ offset = 4;
+ if (priv->has_hostscan) {
+ atom_len = le16_to_cpup((__le16 *)buf);
+ /* Sanity check for atom_len */
+ if (atom_len < sizeof(struct prism2_scan_apinfo)) {
+ printk(KERN_ERR "%s: Invalid atom_len in scan "
+ "data: %zu\n", priv->ndev->name,
+ atom_len);
+ abort = true;
+ goto scan_abort;
+ }
+ } else
+ atom_len = offsetof(struct prism2_scan_apinfo, atim);
+ break;
+
+ default:
+ abort = true;
+ goto scan_abort;
+ }
+
+ /* Check that we got an whole number of atoms */
+ if ((len - offset) % atom_len) {
+ printk(KERN_ERR "%s: Unexpected scan data length %zu, "
+ "atom_len %zu, offset %d\n", priv->ndev->name, len,
+ atom_len, offset);
+ abort = true;
+ goto scan_abort;
+ }
+
+ /* Process the entries one by one */
+ for (; offset + atom_len <= len; offset += atom_len) {
+ union hermes_scan_info *atom;
+
+ atom = (union hermes_scan_info *) (buf + offset);
+
+ orinoco_add_hostscan_result(priv, atom);
+ }
+
+ scan_abort:
+ if (priv->scan_request) {
+ cfg80211_scan_done(priv->scan_request, abort);
+ priv->scan_request = NULL;
+ }
+}
+
+void orinoco_scan_done(struct orinoco_private *priv, bool abort)
+{
+ if (priv->scan_request) {
+ cfg80211_scan_done(priv->scan_request, abort);
+ priv->scan_request = NULL;
+ }
+}
Code Review / kvmfornfv.git / blobdiff