* 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.
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
*/
#include "includes.h"
#include "common.h"
+#include "common/defs.h"
+#include "common/ieee802_11_common.h"
#include "p2p_i.h"
}
-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
+ * @op_class: Operating 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)
+int p2p_channel_to_freq(int op_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;
+ return ieee80211_chan_to_freq(NULL, op_class, channel);
}
/**
* p2p_freq_to_channel - Convert frequency into channel info
- * @country: Country code
- * @reg_class: Buffer for returning regulatory class
+ * @op_class: Buffer for returning operating 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)
+int p2p_freq_to_channel(unsigned int freq, u8 *op_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;
- }
+ if (ieee80211_freq_to_channel_ext(freq, 0, 0, op_class, channel) ==
+ NUM_HOSTAPD_MODES)
+ return -1;
- return -1;
+ return 0;
}
}
+static void p2p_op_class_union(struct p2p_reg_class *cl,
+ const struct p2p_reg_class *b_cl)
+{
+ size_t i, j;
+
+ for (i = 0; i < b_cl->channels; i++) {
+ for (j = 0; j < cl->channels; j++) {
+ if (b_cl->channel[i] == cl->channel[j])
+ break;
+ }
+ if (j == cl->channels) {
+ if (cl->channels == P2P_MAX_REG_CLASS_CHANNELS)
+ return;
+ cl->channel[cl->channels++] = b_cl->channel[i];
+ }
+ }
+}
+
+
+/**
+ * p2p_channels_union_inplace - Inplace union of channel lists
+ * @res: Input data and place for returning union of the channel sets
+ * @b: Second set of channels
+ */
+void p2p_channels_union_inplace(struct p2p_channels *res,
+ const struct p2p_channels *b)
+{
+ size_t i, j;
+
+ for (i = 0; i < res->reg_classes; i++) {
+ struct p2p_reg_class *cl = &res->reg_class[i];
+ for (j = 0; j < b->reg_classes; j++) {
+ const struct p2p_reg_class *b_cl = &b->reg_class[j];
+ if (cl->reg_class != b_cl->reg_class)
+ continue;
+ p2p_op_class_union(cl, b_cl);
+ }
+ }
+
+ for (j = 0; j < b->reg_classes; j++) {
+ const struct p2p_reg_class *b_cl = &b->reg_class[j];
+
+ for (i = 0; i < res->reg_classes; i++) {
+ struct p2p_reg_class *cl = &res->reg_class[i];
+ if (cl->reg_class == b_cl->reg_class)
+ break;
+ }
+
+ if (i == res->reg_classes) {
+ if (res->reg_classes == P2P_MAX_REG_CLASSES)
+ return;
+ os_memcpy(&res->reg_class[res->reg_classes++],
+ b_cl, sizeof(struct p2p_reg_class));
+ }
+ }
+}
+
+
+/**
+ * p2p_channels_union - Union of channel lists
+ * @a: First set of channels
+ * @b: Second set of channels
+ * @res: Data structure for returning the union of channels
+ */
+void p2p_channels_union(const struct p2p_channels *a,
+ const struct p2p_channels *b,
+ struct p2p_channels *res)
+{
+ os_memcpy(res, a, sizeof(*res));
+ p2p_channels_union_inplace(res, b);
+}
+
+
+void p2p_channels_remove_freqs(struct p2p_channels *chan,
+ const struct wpa_freq_range_list *list)
+{
+ size_t o, c;
+
+ if (list == NULL)
+ return;
+
+ o = 0;
+ while (o < chan->reg_classes) {
+ struct p2p_reg_class *op = &chan->reg_class[o];
+
+ c = 0;
+ while (c < op->channels) {
+ int freq = p2p_channel_to_freq(op->reg_class,
+ op->channel[c]);
+ if (freq > 0 && freq_range_list_includes(list, freq)) {
+ op->channels--;
+ os_memmove(&op->channel[c],
+ &op->channel[c + 1],
+ op->channels - c);
+ } else
+ c++;
+ }
+
+ if (op->channels == 0) {
+ chan->reg_classes--;
+ os_memmove(&chan->reg_class[o], &chan->reg_class[o + 1],
+ (chan->reg_classes - o) *
+ sizeof(struct p2p_reg_class));
+ } else
+ o++;
+ }
+}
+
+
/**
* p2p_channels_includes - Check whether a channel is included in the list
* @channels: List of supported channels
}
+int p2p_channels_includes_freq(const struct p2p_channels *channels,
+ unsigned int freq)
+{
+ size_t i, j;
+ for (i = 0; i < channels->reg_classes; i++) {
+ const struct p2p_reg_class *reg = &channels->reg_class[i];
+ for (j = 0; j < reg->channels; j++) {
+ if (p2p_channel_to_freq(reg->reg_class,
+ reg->channel[j]) == (int) freq)
+ 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)
+ if (p2p_freq_to_channel(freq, &op_reg_class, &op_channel) < 0)
return 0;
return p2p_channels_includes(&p2p->cfg->channels, op_reg_class,
op_channel);
}
+
+
+int p2p_supported_freq_go(struct p2p_data *p2p, unsigned int freq)
+{
+ u8 op_reg_class, op_channel;
+ if (p2p_freq_to_channel(freq, &op_reg_class, &op_channel) < 0)
+ return 0;
+ return p2p_channels_includes(&p2p->cfg->channels, op_reg_class,
+ op_channel) &&
+ !freq_range_list_includes(&p2p->no_go_freq, freq);
+}
+
+
+int p2p_supported_freq_cli(struct p2p_data *p2p, unsigned int freq)
+{
+ u8 op_reg_class, op_channel;
+ if (p2p_freq_to_channel(freq, &op_reg_class, &op_channel) < 0)
+ return 0;
+ return p2p_channels_includes(&p2p->cfg->channels, op_reg_class,
+ op_channel) ||
+ p2p_channels_includes(&p2p->cfg->cli_channels, op_reg_class,
+ op_channel);
+}
+
+
+unsigned int p2p_get_pref_freq(struct p2p_data *p2p,
+ const struct p2p_channels *channels)
+{
+ unsigned int i;
+ int freq = 0;
+ const struct p2p_channels *tmpc = channels ?
+ channels : &p2p->cfg->channels;
+
+ if (tmpc == NULL)
+ return 0;
+
+ for (i = 0; p2p->cfg->pref_chan && i < p2p->cfg->num_pref_chan; i++) {
+ freq = p2p_channel_to_freq(p2p->cfg->pref_chan[i].op_class,
+ p2p->cfg->pref_chan[i].chan);
+ if (p2p_channels_includes_freq(tmpc, freq))
+ return freq;
+ }
+ return 0;
+}
+
+
+void p2p_channels_dump(struct p2p_data *p2p, const char *title,
+ const struct p2p_channels *chan)
+{
+ char buf[500], *pos, *end;
+ size_t i, j;
+ int ret;
+
+ pos = buf;
+ end = pos + sizeof(buf);
+
+ for (i = 0; i < chan->reg_classes; i++) {
+ const struct p2p_reg_class *c;
+ c = &chan->reg_class[i];
+ ret = os_snprintf(pos, end - pos, " %u:", c->reg_class);
+ if (os_snprintf_error(end - pos, ret))
+ break;
+ pos += ret;
+
+ for (j = 0; j < c->channels; j++) {
+ ret = os_snprintf(pos, end - pos, "%s%u",
+ j == 0 ? "" : ",",
+ c->channel[j]);
+ if (os_snprintf_error(end - pos, ret))
+ break;
+ pos += ret;
+ }
+ }
+ *pos = '\0';
+
+ p2p_dbg(p2p, "%s:%s", title, buf);
+}
+
+
+static u8 p2p_channel_pick_random(const u8 *channels, unsigned int num_channels)
+{
+ unsigned int r;
+ if (os_get_random((u8 *) &r, sizeof(r)) < 0)
+ r = 0;
+ r %= num_channels;
+ return channels[r];
+}
+
+
+int p2p_channel_select(struct p2p_channels *chans, const int *classes,
+ u8 *op_class, u8 *op_channel)
+{
+ unsigned int i, j;
+
+ for (j = 0; classes == NULL || classes[j]; j++) {
+ for (i = 0; i < chans->reg_classes; i++) {
+ struct p2p_reg_class *c = &chans->reg_class[i];
+
+ if (c->channels == 0)
+ continue;
+
+ if (classes == NULL || c->reg_class == classes[j]) {
+ /*
+ * Pick one of the available channels in the
+ * operating class at random.
+ */
+ *op_class = c->reg_class;
+ *op_channel = p2p_channel_pick_random(
+ c->channel, c->channels);
+ return 0;
+ }
+ }
+ if (classes == NULL)
+ break;
+ }
+
+ return -1;
+}
+
+
+int p2p_channel_random_social(struct p2p_channels *chans, u8 *op_class,
+ u8 *op_channel)
+{
+ u8 chan[4];
+ unsigned int num_channels = 0;
+
+ /* Try to find available social channels from 2.4 GHz */
+ if (p2p_channels_includes(chans, 81, 1))
+ chan[num_channels++] = 1;
+ if (p2p_channels_includes(chans, 81, 6))
+ chan[num_channels++] = 6;
+ if (p2p_channels_includes(chans, 81, 11))
+ chan[num_channels++] = 11;
+
+ /* Try to find available social channels from 60 GHz */
+ if (p2p_channels_includes(chans, 180, 2))
+ chan[num_channels++] = 2;
+
+ if (num_channels == 0)
+ return -1;
+
+ *op_channel = p2p_channel_pick_random(chan, num_channels);
+ if (*op_channel == 2)
+ *op_class = 180;
+ else
+ *op_class = 81;
+
+ return 0;
+}
+
+
+int p2p_channels_to_freqs(const struct p2p_channels *channels, int *freq_list,
+ unsigned int max_len)
+{
+ unsigned int i, idx;
+
+ if (!channels || max_len == 0)
+ return 0;
+
+ for (i = 0, idx = 0; i < channels->reg_classes; i++) {
+ const struct p2p_reg_class *c = &channels->reg_class[i];
+ unsigned int j;
+
+ if (idx + 1 == max_len)
+ break;
+ for (j = 0; j < c->channels; j++) {
+ int freq;
+ unsigned int k;
+
+ if (idx + 1 == max_len)
+ break;
+ freq = p2p_channel_to_freq(c->reg_class,
+ c->channel[j]);
+ if (freq < 0)
+ continue;
+
+ for (k = 0; k < idx; k++) {
+ if (freq_list[k] == freq)
+ break;
+ }
+
+ if (k < idx)
+ continue;
+ freq_list[idx++] = freq;
+ }
+ }
+
+ freq_list[idx] = 0;
+
+ return idx;
+}
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