bool
channel_init(void) {
/* get available channels */
ifctrl_iwget_freqlist(conf.if_phy, &channels);
conf.channel_initialized = 1;
printf("Got %d Bands, %d Channels:\n", channels.num_bands, channels.num_channels);
for (int i = 0; i < channels.num_channels && i < MAX_CHANNELS; i++)
printf("%s\n", channel_get_string(i));
if (conf.channel_set_num > 0) {
/* configured values */
int ini_idx = channel_find_index_from_chan(conf.channel_set_num);
if (!channel_change(ini_idx, conf.channel_set_width, conf.channel_set_ht40plus))
return false;
} else {
conf.channel_idx = channel_find_index_from_freq(conf.if_freq);
conf.channel_set_num = channel_get_chan(conf.channel_idx);
if (conf.channel_idx < 0)
return true; // not failure
/* try to set max width */
struct band_info b = channel_get_band_from_idx(conf.channel_idx);
if (conf.channel_width != b.max_chan_width) {
printlog("Try to set max channel width %s",
channel_width_string(b.max_chan_width, -1));
// try both HT40+ and HT40- if necessary
if (!channel_change(conf.channel_idx, b.max_chan_width, true) &&
!channel_change(conf.channel_idx, b.max_chan_width, false))
return false;
}
}
return true;
}
bool
channel_auto_change(void)
{
int new_idx;
bool ret = true;
int start_idx;
if (conf.channel_idx == -1)
return false; /* The current channel is still unknown for some
* reason (mac80211 bug, busy physical interface,
* etc.), it will be fixed when the first packet
* arrives, see fixup_packet_channel().
*
* Without this return, horst would busy-loop forever
* (making the ui totally unresponsive) in the channel
* changing code below because start_idx would be -1
* as well. Short-circuit exiting here is quite
* logical though: it does not make any sense to scan
* channels as long as the channel module is not
* initialized properly. */
if (channel_get_remaining_dwell_time() > 0)
return false; /* too early */
if (conf.do_change_channel) {
start_idx = new_idx = conf.channel_idx;
do {
enum chan_width max_width = channel_get_band_from_idx(new_idx).max_chan_width;
/*
* For HT40 we visit the same channel twice, once with HT40+
* and once with HT40-. This is necessary to see the HT40+/-
* data packets
*/
if (max_width == CHAN_WIDTH_40) {
if (conf.channel_ht40plus)
new_idx++;
conf.channel_ht40plus = !conf.channel_ht40plus; // toggle
} else {
new_idx++;
}
if (new_idx >= channels.num_channels ||
new_idx >= MAX_CHANNELS ||
(conf.channel_max &&
channel_get_chan(new_idx) > conf.channel_max))
new_idx = 0;
ret = channel_change(new_idx, max_width, conf.channel_ht40plus);
/* try setting different channels in case we get errors only
* on some channels (e.g. ipw2200 reports channel 14 but cannot
* be set to use it). stop if we tried all channels */
} while (ret != 1 && new_idx != start_idx);
}
return ret;
}
static int net_receive_conf_chan(unsigned char *buffer, size_t len)
{
struct net_conf_chan *nc;
if (len < sizeof(struct net_conf_chan))
return 0;
nc = (struct net_conf_chan *)buffer;
conf.do_change_channel = nc->do_change;
conf.channel_max = nc->upper;
conf.channel_time = le32toh(nc->dwell_time);
enum chan_width width = nc->width_ht40p & ~NET_WIDTH_HT40PLUS;
bool ht40p = !!(nc->width_ht40p & NET_WIDTH_HT40PLUS);
if (nc->channel != conf.channel_idx ||
width != conf.channel_width ||
ht40p != conf.channel_ht40plus) { /* something changed */
if (cli_fd > -1) { /* server */
if (!channel_change(nc->channel, width, ht40p)) {
printlog("Net Channel %d %s is not available/allowed",
channel_get_chan(nc->channel),
channel_width_string(width, ht40p));
net_send_channel_config();
} else {
/* success: update UI */
conf.channel_set_num = channel_get_chan(nc->channel);
conf.channel_set_width = width;
conf.channel_set_ht40plus = ht40p;
update_display(NULL);
}
} else { /* client */
conf.channel_idx = nc->channel;
conf.channel_width = conf.channel_set_width = width;
conf.channel_ht40plus = conf.channel_set_ht40plus = ht40p;
conf.channel_set_num = channel_get_chan(nc->channel);
update_spectrum_durations();
update_display(NULL);
}
}
return sizeof(struct net_conf_chan);
}
void
update_channel_win(WINDOW *win)
{
int l = 2;
box(win, 0 , 0);
print_centered(win, 0, 39, " Channel Settings ");
wattron(win, WHITE);
for (int b = 0; b < channel_get_num_bands(); b++) {
const struct band_info* bp = channel_get_band(b);
int c = channel_get_idx_from_band_idx(b, 0);
int col = channel_get_chan(c) > 14 ? COL_BAND2 : 2;
wattron(win, A_BOLD);
mvwprintw(win, 2, col, "%s: %s",
col == 2 ? "2.4GHz" : "5GHz",
channel_width_string(bp->max_chan_width, -1));
if (bp->streams_rx || bp->streams_tx)
wprintw(win, " %dx%d", bp->streams_rx, bp->streams_tx);
wattroff(win, A_BOLD);
l = 3;
for (int i = 0; (c = channel_get_idx_from_band_idx(b, i)) != -1; i++) {
if (c == conf.channel_idx)
wattron(win, CYAN);
else
wattron(win, WHITE);
mvwprintw(win, l++,
col,
"%s", channel_get_string(c));
}
}
wattroff(win, WHITE);
l = 17;
wattron(win, A_BOLD);
mvwprintw(win, l++, 2, "s: [%c] Scan",
CHECKED(conf.do_change_channel));
wattroff(win, A_BOLD);
mvwprintw(win, l++, 2, "d: Dwell: %d ms ",
conf.channel_time/1000);
mvwprintw(win, l++, 2, "u: Upper limit: %d ", conf.channel_max);
l++;
wattron(win, A_BOLD);
mvwprintw(win, l++, 2, "m: Set channel: %d ",
channel_get_chan(conf.channel_idx));
wattroff(win, A_BOLD);
mvwprintw(win, l++, 2, "1: [%c] 20 (no HT)",
CHECKED(conf.channel_set_width == CHAN_WIDTH_20_NOHT));
mvwprintw(win, l++, 2, "2: [%c] HT20",
CHECKED(conf.channel_set_width == CHAN_WIDTH_20));
mvwprintw(win, l++, 2, "4: [%c] HT40-",
CHECKED(conf.channel_set_width == CHAN_WIDTH_40 && !conf.channel_set_ht40plus));
mvwprintw(win, l++, 2, "5: [%c] HT40+",
CHECKED(conf.channel_set_width == CHAN_WIDTH_40 && conf.channel_set_ht40plus));
mvwprintw(win, l++, 2, "8: [%c] VHT80",
CHECKED(conf.channel_set_width == CHAN_WIDTH_80));
mvwprintw(win, l++, 2, "6: [%c] VHT160",
CHECKED(conf.channel_set_width == CHAN_WIDTH_160));
print_centered(win, CHANNEL_WIN_HEIGHT-1, CHANNEL_WIN_WIDTH,
"[ Press key or ENTER ]");
wrefresh(win);
}