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path: root/drivers/net/wireless/orinoco/scan.c
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Diffstat (limited to 'drivers/net/wireless/orinoco/scan.c')
-rw-r--r--drivers/net/wireless/orinoco/scan.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/drivers/net/wireless/orinoco/scan.c b/drivers/net/wireless/orinoco/scan.c
new file mode 100644
index 000000000000..89d699d4dfe6
--- /dev/null
+++ b/drivers/net/wireless/orinoco/scan.c
@@ -0,0 +1,233 @@
+/* Helpers for managing scan queues
+ *
+ * See copyright notice in main.c
+ */
+
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/etherdevice.h>
+
+#include "hermes.h"
+#include "orinoco.h"
+
+#include "scan.h"
+
+#define ORINOCO_MAX_BSS_COUNT 64
+
+#define PRIV_BSS ((struct bss_element *)priv->bss_xbss_data)
+#define PRIV_XBSS ((struct xbss_element *)priv->bss_xbss_data)
+
+int orinoco_bss_data_allocate(struct orinoco_private *priv)
+{
+ if (priv->bss_xbss_data)
+ return 0;
+
+ if (priv->has_ext_scan)
+ priv->bss_xbss_data = kzalloc(ORINOCO_MAX_BSS_COUNT *
+ sizeof(struct xbss_element),
+ GFP_KERNEL);
+ else
+ priv->bss_xbss_data = kzalloc(ORINOCO_MAX_BSS_COUNT *
+ sizeof(struct bss_element),
+ GFP_KERNEL);
+
+ if (!priv->bss_xbss_data) {
+ printk(KERN_WARNING "Out of memory allocating beacons");
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+void orinoco_bss_data_free(struct orinoco_private *priv)
+{
+ kfree(priv->bss_xbss_data);
+ priv->bss_xbss_data = NULL;
+}
+
+void orinoco_bss_data_init(struct orinoco_private *priv)
+{
+ int i;
+
+ INIT_LIST_HEAD(&priv->bss_free_list);
+ INIT_LIST_HEAD(&priv->bss_list);
+ if (priv->has_ext_scan)
+ for (i = 0; i < ORINOCO_MAX_BSS_COUNT; i++)
+ list_add_tail(&(PRIV_XBSS[i].list),
+ &priv->bss_free_list);
+ else
+ for (i = 0; i < ORINOCO_MAX_BSS_COUNT; i++)
+ list_add_tail(&(PRIV_BSS[i].list),
+ &priv->bss_free_list);
+
+}
+
+void orinoco_clear_scan_results(struct orinoco_private *priv,
+ unsigned long scan_age)
+{
+ if (priv->has_ext_scan) {
+ struct xbss_element *bss;
+ struct xbss_element *tmp_bss;
+
+ /* Blow away current list of scan results */
+ list_for_each_entry_safe(bss, tmp_bss, &priv->bss_list, list) {
+ if (!scan_age ||
+ time_after(jiffies, bss->last_scanned + scan_age)) {
+ list_move_tail(&bss->list,
+ &priv->bss_free_list);
+ /* Don't blow away ->list, just BSS data */
+ memset(&bss->bss, 0, sizeof(bss->bss));
+ bss->last_scanned = 0;
+ }
+ }
+ } else {
+ struct bss_element *bss;
+ struct bss_element *tmp_bss;
+
+ /* Blow away current list of scan results */
+ list_for_each_entry_safe(bss, tmp_bss, &priv->bss_list, list) {
+ if (!scan_age ||
+ time_after(jiffies, bss->last_scanned + scan_age)) {
+ list_move_tail(&bss->list,
+ &priv->bss_free_list);
+ /* Don't blow away ->list, just BSS data */
+ memset(&bss->bss, 0, sizeof(bss->bss));
+ bss->last_scanned = 0;
+ }
+ }
+ }
+}
+
+void orinoco_add_ext_scan_result(struct orinoco_private *priv,
+ struct agere_ext_scan_info *atom)
+{
+ struct xbss_element *bss = NULL;
+ int found = 0;
+
+ /* Try to update an existing bss first */
+ list_for_each_entry(bss, &priv->bss_list, list) {
+ if (compare_ether_addr(bss->bss.bssid, atom->bssid))
+ continue;
+ /* ESSID lengths */
+ if (bss->bss.data[1] != atom->data[1])
+ continue;
+ if (memcmp(&bss->bss.data[2], &atom->data[2],
+ atom->data[1]))
+ continue;
+ found = 1;
+ break;
+ }
+
+ /* Grab a bss off the free list */
+ if (!found && !list_empty(&priv->bss_free_list)) {
+ bss = list_entry(priv->bss_free_list.next,
+ struct xbss_element, list);
+ list_del(priv->bss_free_list.next);
+
+ list_add_tail(&bss->list, &priv->bss_list);
+ }
+
+ if (bss) {
+ /* Always update the BSS to get latest beacon info */
+ memcpy(&bss->bss, atom, sizeof(bss->bss));
+ bss->last_scanned = jiffies;
+ }
+}
+
+int orinoco_process_scan_results(struct orinoco_private *priv,
+ unsigned char *buf,
+ int len)
+{
+ int offset; /* In the scan data */
+ union hermes_scan_info *atom;
+ int atom_len;
+
+ 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: %d\n", priv->ndev->name,
+ atom_len);
+ return -EIO;
+ }
+ } else
+ atom_len = offsetof(struct prism2_scan_apinfo, atim);
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ /* Check that we got an whole number of atoms */
+ if ((len - offset) % atom_len) {
+ printk(KERN_ERR "%s: Unexpected scan data length %d, "
+ "atom_len %d, offset %d\n", priv->ndev->name, len,
+ atom_len, offset);
+ return -EIO;
+ }
+
+ orinoco_clear_scan_results(priv, msecs_to_jiffies(15000));
+
+ /* Read the entries one by one */
+ for (; offset + atom_len <= len; offset += atom_len) {
+ int found = 0;
+ struct bss_element *bss = NULL;
+
+ /* Get next atom */
+ atom = (union hermes_scan_info *) (buf + offset);
+
+ /* Try to update an existing bss first */
+ list_for_each_entry(bss, &priv->bss_list, list) {
+ if (compare_ether_addr(bss->bss.a.bssid, atom->a.bssid))
+ continue;
+ if (le16_to_cpu(bss->bss.a.essid_len) !=
+ le16_to_cpu(atom->a.essid_len))
+ continue;
+ if (memcmp(bss->bss.a.essid, atom->a.essid,
+ le16_to_cpu(atom->a.essid_len)))
+ continue;
+ found = 1;
+ break;
+ }
+
+ /* Grab a bss off the free list */
+ if (!found && !list_empty(&priv->bss_free_list)) {
+ bss = list_entry(priv->bss_free_list.next,
+ struct bss_element, list);
+ list_del(priv->bss_free_list.next);
+
+ list_add_tail(&bss->list, &priv->bss_list);
+ }
+
+ if (bss) {
+ /* Always update the BSS to get latest beacon info */
+ memcpy(&bss->bss, atom, sizeof(bss->bss));
+ bss->last_scanned = jiffies;
+ }
+ }
+
+ return 0;
+}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.