--- /dev/null
+/*
+ * P2P - generic helper functions
+ * Copyright (c) 2009, Atheros Communications
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#include "includes.h"
+
+#include "common.h"
+#include "p2p_i.h"
+
+
+/**
+ * p2p_random - Generate random string for SSID and passphrase
+ * @buf: Buffer for returning the result
+ * @len: Number of octets to write to the buffer
+ * Returns: 0 on success, -1 on failure
+ *
+ * This function generates a random string using the following character set:
+ * 'A'-'Z', 'a'-'z', '0'-'9'.
+ */
+int p2p_random(char *buf, size_t len)
+{
+ u8 val;
+ size_t i;
+ u8 letters = 'Z' - 'A' + 1;
+ u8 numbers = 10;
+
+ if (os_get_random((unsigned char *) buf, len))
+ return -1;
+ /* Character set: 'A'-'Z', 'a'-'z', '0'-'9' */
+ for (i = 0; i < len; i++) {
+ val = buf[i];
+ val %= 2 * letters + numbers;
+ if (val < letters)
+ buf[i] = 'A' + val;
+ else if (val < 2 * letters)
+ buf[i] = 'a' + (val - letters);
+ else
+ buf[i] = '0' + (val - 2 * letters);
+ }
+
+ return 0;
+}
+
+
+static int p2p_channel_to_freq_j4(int reg_class, int channel)
+{
+ /* Table J-4 in P802.11REVmb/D4.0 - Global operating classes */
+ /* TODO: more regulatory classes */
+ switch (reg_class) {
+ case 81:
+ /* channels 1..13 */
+ if (channel < 1 || channel > 13)
+ return -1;
+ return 2407 + 5 * channel;
+ case 82:
+ /* channel 14 */
+ if (channel != 14)
+ return -1;
+ return 2414 + 5 * channel;
+ case 83: /* channels 1..9; 40 MHz */
+ case 84: /* channels 5..13; 40 MHz */
+ if (channel < 1 || channel > 13)
+ return -1;
+ return 2407 + 5 * channel;
+ case 115: /* channels 36,40,44,48; indoor only */
+ case 118: /* channels 52,56,60,64; dfs */
+ if (channel < 36 || channel > 64)
+ return -1;
+ return 5000 + 5 * channel;
+ case 124: /* channels 149,153,157,161 */
+ case 125: /* channels 149,153,157,161,165,169 */
+ if (channel < 149 || channel > 161)
+ return -1;
+ return 5000 + 5 * channel;
+ case 116: /* channels 36,44; 40 MHz; indoor only */
+ case 117: /* channels 40,48; 40 MHz; indoor only */
+ case 119: /* channels 52,60; 40 MHz; dfs */
+ case 120: /* channels 56,64; 40 MHz; dfs */
+ if (channel < 36 || channel > 64)
+ return -1;
+ return 5000 + 5 * channel;
+ case 126: /* channels 149,157; 40 MHz */
+ case 127: /* channels 153,161; 40 MHz */
+ if (channel < 149 || channel > 161)
+ return -1;
+ return 5000 + 5 * channel;
+ }
+ return -1;
+}
+
+
+/**
+ * p2p_channel_to_freq - Convert channel info to frequency
+ * @country: Country code
+ * @reg_class: Regulatory class
+ * @channel: Channel number
+ * Returns: Frequency in MHz or -1 if the specified channel is unknown
+ */
+int p2p_channel_to_freq(const char *country, int reg_class, int channel)
+{
+ if (country[2] == 0x04)
+ return p2p_channel_to_freq_j4(reg_class, channel);
+
+ /* These are mainly for backwards compatibility; to be removed */
+ switch (reg_class) {
+ case 1: /* US/1, EU/1, JP/1 = 5 GHz, channels 36,40,44,48 */
+ if (channel < 36 || channel > 48)
+ return -1;
+ return 5000 + 5 * channel;
+ case 3: /* US/3 = 5 GHz, channels 149,153,157,161 */
+ case 5: /* US/5 = 5 GHz, channels 149,153,157,161 */
+ if (channel < 149 || channel > 161)
+ return -1;
+ return 5000 + 5 * channel;
+ case 4: /* EU/4 = 2.407 GHz, channels 1..13 */
+ case 12: /* US/12 = 2.407 GHz, channels 1..11 */
+ case 30: /* JP/30 = 2.407 GHz, channels 1..13 */
+ if (channel < 1 || channel > 13)
+ return -1;
+ return 2407 + 5 * channel;
+ case 31: /* JP/31 = 2.414 GHz, channel 14 */
+ if (channel != 14)
+ return -1;
+ return 2414 + 5 * channel;
+ }
+
+ return -1;
+}
+
+
+/**
+ * p2p_freq_to_channel - Convert frequency into channel info
+ * @country: Country code
+ * @reg_class: Buffer for returning regulatory class
+ * @channel: Buffer for returning channel number
+ * Returns: 0 on success, -1 if the specified frequency is unknown
+ */
+int p2p_freq_to_channel(const char *country, unsigned int freq, u8 *reg_class,
+ u8 *channel)
+{
+ /* TODO: more operating classes */
+ if (freq >= 2412 && freq <= 2472) {
+ *reg_class = 81; /* 2.407 GHz, channels 1..13 */
+ *channel = (freq - 2407) / 5;
+ return 0;
+ }
+
+ if (freq == 2484) {
+ *reg_class = 82; /* channel 14 */
+ *channel = 14;
+ return 0;
+ }
+
+ if (freq >= 5180 && freq <= 5240) {
+ *reg_class = 115; /* 5 GHz, channels 36..48 */
+ *channel = (freq - 5000) / 5;
+ return 0;
+ }
+
+ if (freq >= 5745 && freq <= 5805) {
+ *reg_class = 124; /* 5 GHz, channels 149..161 */
+ *channel = (freq - 5000) / 5;
+ return 0;
+ }
+
+ return -1;
+}
+
+
+static void p2p_reg_class_intersect(const struct p2p_reg_class *a,
+ const struct p2p_reg_class *b,
+ struct p2p_reg_class *res)
+{
+ size_t i, j;
+
+ res->reg_class = a->reg_class;
+
+ for (i = 0; i < a->channels; i++) {
+ for (j = 0; j < b->channels; j++) {
+ if (a->channel[i] != b->channel[j])
+ continue;
+ res->channel[res->channels] = a->channel[i];
+ res->channels++;
+ if (res->channels == P2P_MAX_REG_CLASS_CHANNELS)
+ return;
+ }
+ }
+}
+
+
+/**
+ * p2p_channels_intersect - Intersection of supported channel lists
+ * @a: First set of supported channels
+ * @b: Second set of supported channels
+ * @res: Data structure for returning the intersection of support channels
+ *
+ * This function can be used to find a common set of supported channels. Both
+ * input channels sets are assumed to use the same country code. If different
+ * country codes are used, the regulatory class numbers may not be matched
+ * correctly and results are undefined.
+ */
+void p2p_channels_intersect(const struct p2p_channels *a,
+ const struct p2p_channels *b,
+ struct p2p_channels *res)
+{
+ size_t i, j;
+
+ os_memset(res, 0, sizeof(*res));
+
+ for (i = 0; i < a->reg_classes; i++) {
+ const struct p2p_reg_class *a_reg = &a->reg_class[i];
+ for (j = 0; j < b->reg_classes; j++) {
+ const struct p2p_reg_class *b_reg = &b->reg_class[j];
+ if (a_reg->reg_class != b_reg->reg_class)
+ continue;
+ p2p_reg_class_intersect(
+ a_reg, b_reg,
+ &res->reg_class[res->reg_classes]);
+ if (res->reg_class[res->reg_classes].channels) {
+ res->reg_classes++;
+ if (res->reg_classes == P2P_MAX_REG_CLASSES)
+ return;
+ }
+ }
+ }
+}
+
+
+/**
+ * p2p_channels_includes - Check whether a channel is included in the list
+ * @channels: List of supported channels
+ * @reg_class: Regulatory class of the channel to search
+ * @channel: Channel number of the channel to search
+ * Returns: 1 if channel was found or 0 if not
+ */
+int p2p_channels_includes(const struct p2p_channels *channels, u8 reg_class,
+ u8 channel)
+{
+ size_t i, j;
+ for (i = 0; i < channels->reg_classes; i++) {
+ const struct p2p_reg_class *reg = &channels->reg_class[i];
+ if (reg->reg_class != reg_class)
+ continue;
+ for (j = 0; j < reg->channels; j++) {
+ if (reg->channel[j] == channel)
+ return 1;
+ }
+ }
+ return 0;
+}
+
+
+int p2p_supported_freq(struct p2p_data *p2p, unsigned int freq)
+{
+ u8 op_reg_class, op_channel;
+ if (p2p_freq_to_channel(p2p->cfg->country, freq,
+ &op_reg_class, &op_channel) < 0)
+ return 0;
+ return p2p_channels_includes(&p2p->cfg->channels, op_reg_class,
+ op_channel);
+}
projects / mech_eap.git / blobdiff