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authorDavid Spinadel <david.spinadel@intel.com>2016-02-15 14:53:24 (GMT)
committerJouni Malinen <j@w1.fi>2016-02-22 17:53:04 (GMT)
commit92c6e2e3a92906083d11471ea1b2965758068d8d (patch)
tree88521602e5d82f083e9842dcfd2ea20c269a5573 /wpa_supplicant/mbo.c
parentfacf2c728a59af817aad9fe70d23d8b2519d8a94 (diff)
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MBO: Implement MBO non-preferred channel report in Association Request
Add MBO IE with non-preferred channels to (Re)Association Request frames. Signed-off-by: David Spinadel <david.spinadel@intel.com>
Diffstat (limited to 'wpa_supplicant/mbo.c')
-rw-r--r--wpa_supplicant/mbo.c262
1 files changed, 262 insertions, 0 deletions
diff --git a/wpa_supplicant/mbo.c b/wpa_supplicant/mbo.c
new file mode 100644
index 0000000..369232e
--- /dev/null
+++ b/wpa_supplicant/mbo.c
@@ -0,0 +1,262 @@
+/*
+ * wpa_supplicant - MBO
+ *
+ * Copyright(c) 2015 Intel Deutschland GmbH
+ * Contact Information:
+ * Intel Linux Wireless <ilw@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ * 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 "common/ieee802_11_defs.h"
+#include "config.h"
+#include "wpa_supplicant_i.h"
+#include "driver_i.h"
+#include "bss.h"
+
+/* type + length + oui + oui type */
+#define MBO_IE_HEADER 6
+
+
+static int wpas_mbo_validate_non_pref_chan(u8 oper_class, u8 chan, u8 reason)
+{
+ if (reason > MBO_NON_PREF_CHAN_REASON_INT_INTERFERENCE)
+ return -1;
+
+ /* Only checking the validity of the channel and oper_class */
+ if (ieee80211_chan_to_freq(NULL, oper_class, chan) == -1)
+ return -1;
+
+ return 0;
+}
+
+
+static void wpas_mbo_non_pref_chan_attr_body(struct wpa_supplicant *wpa_s,
+ struct wpabuf *mbo,
+ u8 start, u8 end)
+{
+ u8 i;
+
+ wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].oper_class);
+
+ for (i = start; i < end; i++)
+ wpabuf_put_u8(mbo, wpa_s->non_pref_chan[i].chan);
+
+ wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].preference);
+ wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].reason);
+ wpabuf_put_u8(mbo, wpa_s->non_pref_chan[start].reason_detail);
+}
+
+
+static void wpas_mbo_non_pref_chan_attr(struct wpa_supplicant *wpa_s,
+ struct wpabuf *mbo, u8 start, u8 end)
+{
+ size_t size = end - start + 4;
+
+ if (size + 2 > wpabuf_tailroom(mbo))
+ return;
+
+ wpabuf_put_u8(mbo, MBO_ATTR_ID_NON_PREF_CHAN_REPORT);
+ wpabuf_put_u8(mbo, size); /* Length */
+
+ wpas_mbo_non_pref_chan_attr_body(wpa_s, mbo, start, end);
+}
+
+
+static void wpas_mbo_non_pref_chan_attrs(struct wpa_supplicant *wpa_s,
+ struct wpabuf *mbo)
+
+{
+ u8 i, start = 0;
+ struct wpa_mbo_non_pref_channel *start_pref;
+
+ if (!wpa_s->non_pref_chan || !wpa_s->non_pref_chan_num)
+ return;
+ start_pref = &wpa_s->non_pref_chan[0];
+
+ for (i = 1; i <= wpa_s->non_pref_chan_num; i++) {
+ struct wpa_mbo_non_pref_channel *non_pref = NULL;
+
+ if (i < wpa_s->non_pref_chan_num)
+ non_pref = &wpa_s->non_pref_chan[i];
+ if (!non_pref ||
+ non_pref->oper_class != start_pref->oper_class ||
+ non_pref->reason != start_pref->reason ||
+ non_pref->reason_detail != start_pref->reason_detail ||
+ non_pref->preference != start_pref->preference) {
+ wpas_mbo_non_pref_chan_attr(wpa_s, mbo, start, i);
+
+ if (!non_pref)
+ return;
+
+ start = i;
+ start_pref = non_pref;
+ }
+ }
+}
+
+
+int wpas_mbo_ie(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
+{
+ struct wpabuf *mbo;
+ int res;
+
+ if (!wpa_s->non_pref_chan || !wpa_s->non_pref_chan_num ||
+ len < MBO_IE_HEADER + 7)
+ return 0;
+
+ /* Leave room for the MBO IE header */
+ mbo = wpabuf_alloc(len - MBO_IE_HEADER);
+ if (!mbo)
+ return 0;
+
+ /* Add non-preferred channels attribute */
+ wpas_mbo_non_pref_chan_attrs(wpa_s, mbo);
+
+ res = mbo_add_ie(buf, len, wpabuf_head_u8(mbo), wpabuf_len(mbo));
+ if (!res)
+ wpa_printf(MSG_ERROR, "Failed to add MBO IE");
+
+ wpabuf_free(mbo);
+ return res;
+}
+
+
+static int wpa_non_pref_chan_is_eq(struct wpa_mbo_non_pref_channel *a,
+ struct wpa_mbo_non_pref_channel *b)
+{
+ return a->oper_class == b->oper_class && a->chan == b->chan;
+}
+
+
+/*
+ * wpa_non_pref_chan_cmp - Compare two channels for sorting
+ *
+ * In MBO IE non-preferred channel subelement we can put many channels in an
+ * attribute if they are in the same operating class and have the same
+ * preference, reason, and reason detail. To make it easy for the functions that
+ * build the IE attributes and WNM Request subelements, save the channels sorted
+ * by their oper_class, reason, and reason_detail.
+ */
+static int wpa_non_pref_chan_cmp(const void *_a, const void *_b)
+{
+ const struct wpa_mbo_non_pref_channel *a = _a, *b = _b;
+
+ if (a->oper_class != b->oper_class)
+ return a->oper_class - b->oper_class;
+ if (a->reason != b->reason)
+ return a->reason - b->reason;
+ if (a->reason_detail != b->reason_detail)
+ return a->reason_detail - b->reason_detail;
+ return a->preference - b->preference;
+}
+
+
+int wpas_mbo_update_non_pref_chan(struct wpa_supplicant *wpa_s,
+ const char *non_pref_chan)
+{
+ char *cmd, *token, *context = NULL;
+ struct wpa_mbo_non_pref_channel *chans = NULL, *tmp_chans;
+ size_t num = 0, size = 0;
+ unsigned i;
+
+ wpa_printf(MSG_DEBUG, "MBO: Update non-preferred channels, non_pref_chan=%s",
+ non_pref_chan ? non_pref_chan : "N/A");
+
+ /*
+ * The shortest channel configuration is 10 characters - commas, 3
+ * colons, and 4 values that one of them (oper_class) is 2 digits or
+ * more.
+ */
+ if (!non_pref_chan || os_strlen(non_pref_chan) < 10)
+ goto update;
+
+ cmd = os_strdup(non_pref_chan);
+ if (!cmd)
+ return -1;
+
+ while ((token = str_token(cmd, " ", &context))) {
+ struct wpa_mbo_non_pref_channel *chan;
+ int ret;
+ unsigned int _oper_class;
+ unsigned int _chan;
+ unsigned int _preference;
+ unsigned int _reason;
+ unsigned int _reason_detail;
+
+ if (num == size) {
+ size = size ? size * 2 : 1;
+ tmp_chans = os_realloc_array(chans, size,
+ sizeof(*chans));
+ if (!tmp_chans) {
+ wpa_printf(MSG_ERROR,
+ "Couldn't reallocate non_pref_chan");
+ goto fail;
+ }
+ chans = tmp_chans;
+ }
+
+ chan = &chans[num];
+
+ ret = sscanf(token, "%u:%u:%u:%u:%u", &_oper_class,
+ &_chan, &_preference, &_reason,
+ &_reason_detail);
+ if ((ret != 4 && ret != 5) ||
+ _oper_class > 255 || _chan > 255 ||
+ _preference > 255 || _reason > 65535 ||
+ (ret == 5 && _reason_detail > 255)) {
+ wpa_printf(MSG_ERROR, "Invalid non-pref chan input %s",
+ token);
+ goto fail;
+ }
+ chan->oper_class = _oper_class;
+ chan->chan = _chan;
+ chan->preference = _preference;
+ chan->reason = _reason;
+ chan->reason_detail = ret == 4 ? 0 : _reason_detail;
+
+ if (wpas_mbo_validate_non_pref_chan(chan->oper_class,
+ chan->chan, chan->reason)) {
+ wpa_printf(MSG_ERROR,
+ "Invalid non_pref_chan: oper class %d chan %d reason %d",
+ chan->oper_class, chan->chan, chan->reason);
+ goto fail;
+ }
+
+ for (i = 0; i < num; i++)
+ if (wpa_non_pref_chan_is_eq(chan, &chans[i]))
+ break;
+ if (i != num) {
+ wpa_printf(MSG_ERROR,
+ "oper class %d chan %d is duplicated",
+ chan->oper_class, chan->chan);
+ goto fail;
+ }
+
+ num++;
+ }
+
+ os_free(cmd);
+
+ if (chans) {
+ qsort(chans, num, sizeof(struct wpa_mbo_non_pref_channel),
+ wpa_non_pref_chan_cmp);
+ }
+
+update:
+ os_free(wpa_s->non_pref_chan);
+ wpa_s->non_pref_chan = chans;
+ wpa_s->non_pref_chan_num = num;
+
+ return 0;
+
+fail:
+ os_free(chans);
+ os_free(cmd);
+ return -1;
+}