510 lines
14 KiB
C
510 lines
14 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Host AP driver Info Frame processing (part of hostap.o module) */
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#include <linux/if_arp.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <linux/etherdevice.h>
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#include "hostap_wlan.h"
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#include "hostap.h"
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#include "hostap_ap.h"
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/* Called only as a tasklet (software IRQ) */
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static void prism2_info_commtallies16(local_info_t *local, unsigned char *buf,
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int left)
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{
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struct hfa384x_comm_tallies *tallies;
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if (left < sizeof(struct hfa384x_comm_tallies)) {
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printk(KERN_DEBUG "%s: too short (len=%d) commtallies "
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"info frame\n", local->dev->name, left);
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return;
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}
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tallies = (struct hfa384x_comm_tallies *) buf;
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#define ADD_COMM_TALLIES(name) \
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local->comm_tallies.name += le16_to_cpu(tallies->name)
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ADD_COMM_TALLIES(tx_unicast_frames);
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ADD_COMM_TALLIES(tx_multicast_frames);
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ADD_COMM_TALLIES(tx_fragments);
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ADD_COMM_TALLIES(tx_unicast_octets);
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ADD_COMM_TALLIES(tx_multicast_octets);
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ADD_COMM_TALLIES(tx_deferred_transmissions);
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ADD_COMM_TALLIES(tx_single_retry_frames);
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ADD_COMM_TALLIES(tx_multiple_retry_frames);
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ADD_COMM_TALLIES(tx_retry_limit_exceeded);
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ADD_COMM_TALLIES(tx_discards);
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ADD_COMM_TALLIES(rx_unicast_frames);
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ADD_COMM_TALLIES(rx_multicast_frames);
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ADD_COMM_TALLIES(rx_fragments);
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ADD_COMM_TALLIES(rx_unicast_octets);
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ADD_COMM_TALLIES(rx_multicast_octets);
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ADD_COMM_TALLIES(rx_fcs_errors);
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ADD_COMM_TALLIES(rx_discards_no_buffer);
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ADD_COMM_TALLIES(tx_discards_wrong_sa);
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ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
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ADD_COMM_TALLIES(rx_message_in_msg_fragments);
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ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
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#undef ADD_COMM_TALLIES
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}
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/* Called only as a tasklet (software IRQ) */
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static void prism2_info_commtallies32(local_info_t *local, unsigned char *buf,
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int left)
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{
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struct hfa384x_comm_tallies32 *tallies;
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if (left < sizeof(struct hfa384x_comm_tallies32)) {
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printk(KERN_DEBUG "%s: too short (len=%d) commtallies32 "
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"info frame\n", local->dev->name, left);
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return;
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}
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tallies = (struct hfa384x_comm_tallies32 *) buf;
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#define ADD_COMM_TALLIES(name) \
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local->comm_tallies.name += le32_to_cpu(tallies->name)
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ADD_COMM_TALLIES(tx_unicast_frames);
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ADD_COMM_TALLIES(tx_multicast_frames);
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ADD_COMM_TALLIES(tx_fragments);
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ADD_COMM_TALLIES(tx_unicast_octets);
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ADD_COMM_TALLIES(tx_multicast_octets);
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ADD_COMM_TALLIES(tx_deferred_transmissions);
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ADD_COMM_TALLIES(tx_single_retry_frames);
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ADD_COMM_TALLIES(tx_multiple_retry_frames);
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ADD_COMM_TALLIES(tx_retry_limit_exceeded);
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ADD_COMM_TALLIES(tx_discards);
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ADD_COMM_TALLIES(rx_unicast_frames);
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ADD_COMM_TALLIES(rx_multicast_frames);
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ADD_COMM_TALLIES(rx_fragments);
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ADD_COMM_TALLIES(rx_unicast_octets);
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ADD_COMM_TALLIES(rx_multicast_octets);
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ADD_COMM_TALLIES(rx_fcs_errors);
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ADD_COMM_TALLIES(rx_discards_no_buffer);
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ADD_COMM_TALLIES(tx_discards_wrong_sa);
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ADD_COMM_TALLIES(rx_discards_wep_undecryptable);
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ADD_COMM_TALLIES(rx_message_in_msg_fragments);
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ADD_COMM_TALLIES(rx_message_in_bad_msg_fragments);
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#undef ADD_COMM_TALLIES
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}
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/* Called only as a tasklet (software IRQ) */
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static void prism2_info_commtallies(local_info_t *local, unsigned char *buf,
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int left)
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{
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if (local->tallies32)
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prism2_info_commtallies32(local, buf, left);
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else
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prism2_info_commtallies16(local, buf, left);
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}
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#ifndef PRISM2_NO_STATION_MODES
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#ifndef PRISM2_NO_DEBUG
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static const char* hfa384x_linkstatus_str(u16 linkstatus)
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{
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switch (linkstatus) {
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case HFA384X_LINKSTATUS_CONNECTED:
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return "Connected";
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case HFA384X_LINKSTATUS_DISCONNECTED:
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return "Disconnected";
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case HFA384X_LINKSTATUS_AP_CHANGE:
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return "Access point change";
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case HFA384X_LINKSTATUS_AP_OUT_OF_RANGE:
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return "Access point out of range";
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case HFA384X_LINKSTATUS_AP_IN_RANGE:
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return "Access point in range";
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case HFA384X_LINKSTATUS_ASSOC_FAILED:
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return "Association failed";
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default:
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return "Unknown";
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}
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}
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#endif /* PRISM2_NO_DEBUG */
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/* Called only as a tasklet (software IRQ) */
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static void prism2_info_linkstatus(local_info_t *local, unsigned char *buf,
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int left)
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{
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u16 val;
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int non_sta_mode;
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/* Alloc new JoinRequests to occur since LinkStatus for the previous
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* has been received */
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local->last_join_time = 0;
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if (left != 2) {
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printk(KERN_DEBUG "%s: invalid linkstatus info frame "
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"length %d\n", local->dev->name, left);
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return;
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}
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non_sta_mode = local->iw_mode == IW_MODE_MASTER ||
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local->iw_mode == IW_MODE_REPEAT ||
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local->iw_mode == IW_MODE_MONITOR;
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val = buf[0] | (buf[1] << 8);
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if (!non_sta_mode || val != HFA384X_LINKSTATUS_DISCONNECTED) {
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PDEBUG(DEBUG_EXTRA, "%s: LinkStatus=%d (%s)\n",
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local->dev->name, val, hfa384x_linkstatus_str(val));
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}
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if (non_sta_mode) {
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netif_carrier_on(local->dev);
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netif_carrier_on(local->ddev);
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return;
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}
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/* Get current BSSID later in scheduled task */
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set_bit(PRISM2_INFO_PENDING_LINKSTATUS, &local->pending_info);
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local->prev_link_status = val;
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schedule_work(&local->info_queue);
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}
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static void prism2_host_roaming(local_info_t *local)
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{
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struct hfa384x_join_request req;
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struct net_device *dev = local->dev;
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struct hfa384x_hostscan_result *selected, *entry;
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int i;
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unsigned long flags;
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if (local->last_join_time &&
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time_before(jiffies, local->last_join_time + 10 * HZ)) {
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PDEBUG(DEBUG_EXTRA, "%s: last join request has not yet been "
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"completed - waiting for it before issuing new one\n",
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dev->name);
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return;
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}
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/* ScanResults are sorted: first ESS results in decreasing signal
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* quality then IBSS results in similar order.
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* Trivial roaming policy: just select the first entry.
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* This could probably be improved by adding hysteresis to limit
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* number of handoffs, etc.
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*
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* Could do periodic RID_SCANREQUEST or Inquire F101 to get new
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* ScanResults */
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spin_lock_irqsave(&local->lock, flags);
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if (local->last_scan_results == NULL ||
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local->last_scan_results_count == 0) {
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spin_unlock_irqrestore(&local->lock, flags);
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PDEBUG(DEBUG_EXTRA, "%s: no scan results for host roaming\n",
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dev->name);
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return;
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}
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selected = &local->last_scan_results[0];
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if (local->preferred_ap[0] || local->preferred_ap[1] ||
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local->preferred_ap[2] || local->preferred_ap[3] ||
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local->preferred_ap[4] || local->preferred_ap[5]) {
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/* Try to find preferred AP */
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PDEBUG(DEBUG_EXTRA, "%s: Preferred AP BSSID %pM\n",
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dev->name, local->preferred_ap);
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for (i = 0; i < local->last_scan_results_count; i++) {
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entry = &local->last_scan_results[i];
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if (memcmp(local->preferred_ap, entry->bssid, 6) == 0)
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{
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PDEBUG(DEBUG_EXTRA, "%s: using preferred AP "
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"selection\n", dev->name);
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selected = entry;
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break;
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}
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}
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}
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memcpy(req.bssid, selected->bssid, ETH_ALEN);
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req.channel = selected->chid;
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spin_unlock_irqrestore(&local->lock, flags);
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PDEBUG(DEBUG_EXTRA, "%s: JoinRequest: BSSID=%pM"
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" channel=%d\n",
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dev->name, req.bssid, le16_to_cpu(req.channel));
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if (local->func->set_rid(dev, HFA384X_RID_JOINREQUEST, &req,
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sizeof(req))) {
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printk(KERN_DEBUG "%s: JoinRequest failed\n", dev->name);
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}
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local->last_join_time = jiffies;
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}
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static void hostap_report_scan_complete(local_info_t *local)
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{
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union iwreq_data wrqu;
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/* Inform user space about new scan results (just empty event,
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* SIOCGIWSCAN can be used to fetch data */
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wrqu.data.length = 0;
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wrqu.data.flags = 0;
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wireless_send_event(local->dev, SIOCGIWSCAN, &wrqu, NULL);
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/* Allow SIOCGIWSCAN handling to occur since we have received
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* scanning result */
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local->scan_timestamp = 0;
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}
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/* Called only as a tasklet (software IRQ) */
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static void prism2_info_scanresults(local_info_t *local, unsigned char *buf,
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int left)
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{
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u16 *pos;
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int new_count, i;
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unsigned long flags;
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struct hfa384x_scan_result *res;
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struct hfa384x_hostscan_result *results, *prev;
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if (left < 4) {
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printk(KERN_DEBUG "%s: invalid scanresult info frame "
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"length %d\n", local->dev->name, left);
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return;
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}
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pos = (u16 *) buf;
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pos++;
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pos++;
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left -= 4;
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new_count = left / sizeof(struct hfa384x_scan_result);
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results = kmalloc_array(new_count,
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sizeof(struct hfa384x_hostscan_result),
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GFP_ATOMIC);
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if (results == NULL)
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return;
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/* Convert to hostscan result format. */
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res = (struct hfa384x_scan_result *) pos;
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for (i = 0; i < new_count; i++) {
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memcpy(&results[i], &res[i],
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sizeof(struct hfa384x_scan_result));
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results[i].atim = 0;
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}
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spin_lock_irqsave(&local->lock, flags);
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local->last_scan_type = PRISM2_SCAN;
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prev = local->last_scan_results;
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local->last_scan_results = results;
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local->last_scan_results_count = new_count;
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spin_unlock_irqrestore(&local->lock, flags);
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kfree(prev);
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hostap_report_scan_complete(local);
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/* Perform rest of ScanResults handling later in scheduled task */
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set_bit(PRISM2_INFO_PENDING_SCANRESULTS, &local->pending_info);
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schedule_work(&local->info_queue);
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}
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/* Called only as a tasklet (software IRQ) */
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static void prism2_info_hostscanresults(local_info_t *local,
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unsigned char *buf, int left)
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{
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int i, result_size, copy_len, new_count;
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struct hfa384x_hostscan_result *results, *prev;
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unsigned long flags;
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__le16 *pos;
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u8 *ptr;
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wake_up_interruptible(&local->hostscan_wq);
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if (left < 4) {
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printk(KERN_DEBUG "%s: invalid hostscanresult info frame "
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"length %d\n", local->dev->name, left);
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return;
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}
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pos = (__le16 *) buf;
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copy_len = result_size = le16_to_cpu(*pos);
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if (result_size == 0) {
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printk(KERN_DEBUG "%s: invalid result_size (0) in "
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"hostscanresults\n", local->dev->name);
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return;
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}
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if (copy_len > sizeof(struct hfa384x_hostscan_result))
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copy_len = sizeof(struct hfa384x_hostscan_result);
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pos++;
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pos++;
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left -= 4;
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ptr = (u8 *) pos;
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new_count = left / result_size;
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results = kcalloc(new_count, sizeof(struct hfa384x_hostscan_result),
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GFP_ATOMIC);
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if (results == NULL)
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return;
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for (i = 0; i < new_count; i++) {
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memcpy(&results[i], ptr, copy_len);
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ptr += result_size;
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left -= result_size;
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}
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if (left) {
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printk(KERN_DEBUG "%s: short HostScan result entry (%d/%d)\n",
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local->dev->name, left, result_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
spin_lock_irqsave(&local->lock, flags);
|
||
|
|
local->last_scan_type = PRISM2_HOSTSCAN;
|
||
|
|
prev = local->last_scan_results;
|
||
|
|
local->last_scan_results = results;
|
||
|
|
local->last_scan_results_count = new_count;
|
||
|
|
spin_unlock_irqrestore(&local->lock, flags);
|
||
|
|
kfree(prev);
|
||
|
|
|
||
|
|
hostap_report_scan_complete(local);
|
||
|
|
}
|
||
|
|
#endif /* PRISM2_NO_STATION_MODES */
|
||
|
|
|
||
|
|
|
||
|
|
/* Called only as a tasklet (software IRQ) */
|
||
|
|
void hostap_info_process(local_info_t *local, struct sk_buff *skb)
|
||
|
|
{
|
||
|
|
struct hfa384x_info_frame *info;
|
||
|
|
unsigned char *buf;
|
||
|
|
int left;
|
||
|
|
#ifndef PRISM2_NO_DEBUG
|
||
|
|
int i;
|
||
|
|
#endif /* PRISM2_NO_DEBUG */
|
||
|
|
|
||
|
|
info = (struct hfa384x_info_frame *) skb->data;
|
||
|
|
buf = skb->data + sizeof(*info);
|
||
|
|
left = skb->len - sizeof(*info);
|
||
|
|
|
||
|
|
switch (le16_to_cpu(info->type)) {
|
||
|
|
case HFA384X_INFO_COMMTALLIES:
|
||
|
|
prism2_info_commtallies(local, buf, left);
|
||
|
|
break;
|
||
|
|
|
||
|
|
#ifndef PRISM2_NO_STATION_MODES
|
||
|
|
case HFA384X_INFO_LINKSTATUS:
|
||
|
|
prism2_info_linkstatus(local, buf, left);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case HFA384X_INFO_SCANRESULTS:
|
||
|
|
prism2_info_scanresults(local, buf, left);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case HFA384X_INFO_HOSTSCANRESULTS:
|
||
|
|
prism2_info_hostscanresults(local, buf, left);
|
||
|
|
break;
|
||
|
|
#endif /* PRISM2_NO_STATION_MODES */
|
||
|
|
|
||
|
|
#ifndef PRISM2_NO_DEBUG
|
||
|
|
default:
|
||
|
|
PDEBUG(DEBUG_EXTRA, "%s: INFO - len=%d type=0x%04x\n",
|
||
|
|
local->dev->name, le16_to_cpu(info->len),
|
||
|
|
le16_to_cpu(info->type));
|
||
|
|
PDEBUG(DEBUG_EXTRA, "Unknown info frame:");
|
||
|
|
for (i = 0; i < (left < 100 ? left : 100); i++)
|
||
|
|
PDEBUG2(DEBUG_EXTRA, " %02x", buf[i]);
|
||
|
|
PDEBUG2(DEBUG_EXTRA, "\n");
|
||
|
|
break;
|
||
|
|
#endif /* PRISM2_NO_DEBUG */
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef PRISM2_NO_STATION_MODES
|
||
|
|
static void handle_info_queue_linkstatus(local_info_t *local)
|
||
|
|
{
|
||
|
|
int val = local->prev_link_status;
|
||
|
|
int connected;
|
||
|
|
union iwreq_data wrqu;
|
||
|
|
|
||
|
|
connected =
|
||
|
|
val == HFA384X_LINKSTATUS_CONNECTED ||
|
||
|
|
val == HFA384X_LINKSTATUS_AP_CHANGE ||
|
||
|
|
val == HFA384X_LINKSTATUS_AP_IN_RANGE;
|
||
|
|
|
||
|
|
if (local->func->get_rid(local->dev, HFA384X_RID_CURRENTBSSID,
|
||
|
|
local->bssid, ETH_ALEN, 1) < 0) {
|
||
|
|
printk(KERN_DEBUG "%s: could not read CURRENTBSSID after "
|
||
|
|
"LinkStatus event\n", local->dev->name);
|
||
|
|
} else {
|
||
|
|
PDEBUG(DEBUG_EXTRA, "%s: LinkStatus: BSSID=%pM\n",
|
||
|
|
local->dev->name,
|
||
|
|
(unsigned char *) local->bssid);
|
||
|
|
if (local->wds_type & HOSTAP_WDS_AP_CLIENT)
|
||
|
|
hostap_add_sta(local->ap, local->bssid);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get BSSID if we have a valid AP address */
|
||
|
|
if (connected) {
|
||
|
|
netif_carrier_on(local->dev);
|
||
|
|
netif_carrier_on(local->ddev);
|
||
|
|
memcpy(wrqu.ap_addr.sa_data, local->bssid, ETH_ALEN);
|
||
|
|
} else {
|
||
|
|
netif_carrier_off(local->dev);
|
||
|
|
netif_carrier_off(local->ddev);
|
||
|
|
eth_zero_addr(wrqu.ap_addr.sa_data);
|
||
|
|
}
|
||
|
|
wrqu.ap_addr.sa_family = ARPHRD_ETHER;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Filter out sequential disconnect events in order not to cause a
|
||
|
|
* flood of SIOCGIWAP events that have a race condition with EAPOL
|
||
|
|
* frames and can confuse wpa_supplicant about the current association
|
||
|
|
* status.
|
||
|
|
*/
|
||
|
|
if (connected || local->prev_linkstatus_connected)
|
||
|
|
wireless_send_event(local->dev, SIOCGIWAP, &wrqu, NULL);
|
||
|
|
local->prev_linkstatus_connected = connected;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
static void handle_info_queue_scanresults(local_info_t *local)
|
||
|
|
{
|
||
|
|
if (local->host_roaming == 1 && local->iw_mode == IW_MODE_INFRA)
|
||
|
|
prism2_host_roaming(local);
|
||
|
|
|
||
|
|
if (local->host_roaming == 2 && local->iw_mode == IW_MODE_INFRA &&
|
||
|
|
!is_zero_ether_addr(local->preferred_ap)) {
|
||
|
|
/*
|
||
|
|
* Firmware seems to be getting into odd state in host_roaming
|
||
|
|
* mode 2 when hostscan is used without join command, so try
|
||
|
|
* to fix this by re-joining the current AP. This does not
|
||
|
|
* actually trigger a new association if the current AP is
|
||
|
|
* still in the scan results.
|
||
|
|
*/
|
||
|
|
prism2_host_roaming(local);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Called only as scheduled task after receiving info frames (used to avoid
|
||
|
|
* pending too much time in HW IRQ handler). */
|
||
|
|
static void handle_info_queue(struct work_struct *work)
|
||
|
|
{
|
||
|
|
local_info_t *local = container_of(work, local_info_t, info_queue);
|
||
|
|
|
||
|
|
if (test_and_clear_bit(PRISM2_INFO_PENDING_LINKSTATUS,
|
||
|
|
&local->pending_info))
|
||
|
|
handle_info_queue_linkstatus(local);
|
||
|
|
|
||
|
|
if (test_and_clear_bit(PRISM2_INFO_PENDING_SCANRESULTS,
|
||
|
|
&local->pending_info))
|
||
|
|
handle_info_queue_scanresults(local);
|
||
|
|
}
|
||
|
|
#endif /* PRISM2_NO_STATION_MODES */
|
||
|
|
|
||
|
|
|
||
|
|
void hostap_info_init(local_info_t *local)
|
||
|
|
{
|
||
|
|
skb_queue_head_init(&local->info_list);
|
||
|
|
#ifndef PRISM2_NO_STATION_MODES
|
||
|
|
INIT_WORK(&local->info_queue, handle_info_queue);
|
||
|
|
#endif /* PRISM2_NO_STATION_MODES */
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
EXPORT_SYMBOL(hostap_info_init);
|
||
|
|
EXPORT_SYMBOL(hostap_info_process);
|