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authorMathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>2018-08-06 19:46:26 (GMT)
committerJouni Malinen <j@w1.fi>2018-12-16 22:02:14 (GMT)
commit6ab73efa7245b8af0df7ba8c6b6ccc66732b2a12 (patch)
treebd05bf09a758ed34d36e1f958786f967b5c3dfef /src/common
parentdce962188005c9843ecff82093420dd9b5b6978a (diff)
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OCV: Add utility functions to insert OCI elements
This commit adds utility functions to insert various encoding of the OCI element. Signed-off-by: Mathy Vanhoef <Mathy.Vanhoef@cs.kuleuven.be>
Diffstat (limited to 'src/common')
-rw-r--r--src/common/ocv.c95
-rw-r--r--src/common/ocv.h37
2 files changed, 132 insertions, 0 deletions
diff --git a/src/common/ocv.c b/src/common/ocv.c
new file mode 100644
index 0000000..17f3855
--- /dev/null
+++ b/src/common/ocv.c
@@ -0,0 +1,95 @@
+/*
+ * Operating Channel Validation (OCV)
+ * Copyright (c) 2018, Mathy Vanhoef
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#include "utils/includes.h"
+#include "utils/common.h"
+#include "drivers/driver.h"
+#include "common/ieee802_11_common.h"
+#include "ocv.h"
+
+/**
+ * Caller of OCV functionality may use various debug output functions, so store
+ * the error here and let the caller use an appropriate debug output function.
+ */
+char ocv_errorstr[256];
+
+
+int ocv_derive_all_parameters(struct oci_info *oci)
+{
+ const struct oper_class_map *op_class_map;
+
+ oci->freq = ieee80211_chan_to_freq(NULL, oci->op_class, oci->channel);
+ if (oci->freq < 0) {
+ wpa_printf(MSG_INFO,
+ "Error interpreting OCI: unrecognized opclass/channel pair (%d/%d)",
+ oci->op_class, oci->channel);
+ return -1;
+ }
+
+ op_class_map = get_oper_class(NULL, oci->op_class);
+ if (!op_class_map) {
+ wpa_printf(MSG_INFO,
+ "Error interpreting OCI: Unrecognized opclass (%d)",
+ oci->op_class);
+ return -1;
+ }
+
+ oci->chanwidth = oper_class_bw_to_int(op_class_map);
+ oci->sec_channel = 0;
+ if (op_class_map->bw == BW40PLUS)
+ oci->sec_channel = 1;
+ else if (op_class_map->bw == BW40MINUS)
+ oci->sec_channel = -1;
+
+ return 0;
+}
+
+
+int ocv_insert_oci(struct wpa_channel_info *ci, u8 **argpos)
+{
+ u8 op_class, channel;
+ u8 *pos = *argpos;
+
+ if (ieee80211_chaninfo_to_channel(ci->frequency, ci->chanwidth,
+ ci->sec_channel,
+ &op_class, &channel) < 0) {
+ wpa_printf(MSG_WARNING,
+ "Cannot determine operating class and channel for OCI element");
+ return -1;
+ }
+
+ *pos++ = op_class;
+ *pos++ = channel;
+ *pos++ = ci->seg1_idx;
+
+ *argpos = pos;
+ return 0;
+}
+
+
+int ocv_insert_oci_kde(struct wpa_channel_info *ci, u8 **argpos)
+{
+ u8 *pos = *argpos;
+
+ *pos++ = WLAN_EID_VENDOR_SPECIFIC;
+ *pos++ = RSN_SELECTOR_LEN + 3;
+ RSN_SELECTOR_PUT(pos, RSN_KEY_DATA_OCI);
+ pos += RSN_SELECTOR_LEN;
+
+ *argpos = pos;
+ return ocv_insert_oci(ci, argpos);
+}
+
+
+int ocv_insert_extended_oci(struct wpa_channel_info *ci, u8 *pos)
+{
+ *pos++ = WLAN_EID_EXTENSION;
+ *pos++ = 1 + OCV_OCI_LEN;
+ *pos++ = WLAN_EID_EXT_OCV_OCI;
+ return ocv_insert_oci(ci, &pos);
+}
diff --git a/src/common/ocv.h b/src/common/ocv.h
new file mode 100644
index 0000000..3f77438
--- /dev/null
+++ b/src/common/ocv.h
@@ -0,0 +1,37 @@
+/*
+ * Operating Channel Validation (OCV)
+ * Copyright (c) 2018, Mathy Vanhoef
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+
+#ifndef OCV_H
+#define OCV_H
+
+struct wpa_channel_info;
+
+struct oci_info {
+ /* Values in the OCI element */
+ u8 op_class;
+ u8 channel;
+ u8 seg1_idx;
+
+ /* Derived values for easier verification */
+ int freq;
+ int sec_channel;
+ int chanwidth;
+};
+
+#define OCV_OCI_LEN 3
+#define OCV_OCI_EXTENDED_LEN (3 + OCV_OCI_LEN)
+#define OCV_OCI_KDE_LEN (2 + RSN_SELECTOR_LEN + OCV_OCI_LEN)
+
+extern char ocv_errorstr[256];
+
+int ocv_derive_all_parameters(struct oci_info *oci);
+int ocv_insert_oci(struct wpa_channel_info *ci, u8 **argpos);
+int ocv_insert_oci_kde(struct wpa_channel_info *ci, u8 **argpos);
+int ocv_insert_extended_oci(struct wpa_channel_info *ci, u8 *pos);
+
+#endif /* OCV_H */