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band: move several scan utilities into band 

This will allow unit testing modules which depend on these
APIs:

scan_channel_to_freq
scan_freq_to_channel
scan_oper_class_to_band
This commit is contained in:
James Prestwood 2021-11-29 15:12:58 -08:00 committed by Denis Kenzior
parent 945710fae1
commit f3c9b66f08
2 changed files with 203 additions and 0 deletions
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193
src/band.c
View File

@ -923,3 +923,196 @@ int oci_from_chandef(const struct band_chandef *own, uint8_t oci[static 3])
return -ENOENT;
}
uint8_t band_freq_to_channel(uint32_t freq, enum band_freq *out_band)
{
uint32_t channel = 0;
if (freq >= 2412 && freq <= 2484) {
if (freq == 2484)
channel = 14;
else {
channel = freq - 2407;
if (channel % 5)
return 0;
channel /= 5;
}
if (out_band)
*out_band = BAND_FREQ_2_4_GHZ;
return channel;
}
if (freq >= 5005 && freq < 5900) {
if (freq % 5)
return 0;
channel = (freq - 5000) / 5;
if (out_band)
*out_band = BAND_FREQ_5_GHZ;
return channel;
}
if (freq >= 4905 && freq < 5000) {
if (freq % 5)
return 0;
channel = (freq - 4000) / 5;
if (out_band)
*out_band = BAND_FREQ_5_GHZ;
return channel;
}
return 0;
}
uint32_t band_channel_to_freq(uint8_t channel, enum band_freq band)
{
if (band == BAND_FREQ_2_4_GHZ) {
if (channel >= 1 && channel <= 13)
return 2407 + 5 * channel;
if (channel == 14)
return 2484;
}
if (band == BAND_FREQ_5_GHZ) {
if (channel >= 1 && channel <= 179)
return 5000 + 5 * channel;
if (channel >= 181 && channel <= 199)
return 4000 + 5 * channel;
}
return 0;
}
static const char *const oper_class_us_codes[] = {
"US", "CA"
};
static const char *const oper_class_eu_codes[] = {
"AL", "AM", "AT", "AZ", "BA", "BE", "BG", "BY", "CH", "CY", "CZ", "DE",
"DK", "EE", "EL", "ES", "FI", "FR", "GE", "HR", "HU", "IE", "IS", "IT",
"LI", "LT", "LU", "LV", "MD", "ME", "MK", "MT", "NL", "NO", "PL", "PT",
"RO", "RS", "RU", "SE", "SI", "SK", "TR", "UA", "UK"
};
/* Annex E, table E-1 */
static const uint8_t oper_class_us_to_global[] = {
[1] = 115, [2] = 118, [3] = 124, [4] = 121,
[5] = 125, [6] = 103, [7] = 103, [8] = 102,
[9] = 102, [10] = 101, [11] = 101, [12] = 81,
[13] = 94, [14] = 95, [15] = 96, [22] = 116,
[23] = 119, [24] = 122, [25] = 126, [26] = 126,
[27] = 117, [28] = 120, [29] = 123, [30] = 127,
[31] = 127, [32] = 83, [33] = 84, [34] = 180,
/* 128 - 130 is a 1 to 1 mapping */
};
/* Annex E, table E-2 */
static const uint8_t oper_class_eu_to_global[] = {
[1] = 115, [2] = 118, [3] = 121, [4] = 81,
[5] = 116, [6] = 119, [7] = 122, [8] = 117,
[9] = 120, [10] = 123, [11] = 83, [12] = 84,
[17] = 125, [18] = 130,
/* 128 - 130 is a 1 to 1 mapping */
};
/* Annex E, table E-3 */
static const uint8_t oper_class_jp_to_global[] = {
[1] = 115, [2] = 112, [3] = 112, [4] = 112,
[5] = 112, [6] = 112, [7] = 109, [8] = 109,
[9] = 109, [10] = 109, [11] = 109, [12] = 113,
[13] = 113, [14] = 113, [15] = 113, [16] = 110,
[17] = 110, [18] = 110, [19] = 110, [20] = 110,
[21] = 114, [22] = 114, [23] = 114, [24] = 114,
[25] = 111, [26] = 111, [27] = 111, [28] = 111,
[29] = 111, [30] = 81, [31] = 82, [32] = 118,
[33] = 118, [34] = 121, [35] = 121, [36] = 116,
[37] = 119, [38] = 119, [39] = 122, [40] = 122,
[41] = 117, [42] = 120, [43] = 120, [44] = 123,
[45] = 123, [46] = 104, [47] = 104, [48] = 104,
[49] = 104, [50] = 104, [51] = 105, [52] = 105,
[53] = 105, [54] = 105, [55] = 105, [56] = 83,
[57] = 84, [58] = 121, [59] = 180,
/* 128 - 130 is a 1 to 1 mapping */
};
/* Annex E, table E-4 (only 2.4GHz and 4.9 / 5GHz bands) */
static const enum band_freq oper_class_to_band_global[] = {
[81 ... 84] = BAND_FREQ_2_4_GHZ,
[104 ... 130] = BAND_FREQ_5_GHZ,
};
/* Annex E, table E-5 */
static const uint8_t oper_class_cn_to_global[] = {
[1] = 115, [2] = 118, [3] = 125, [4] = 116,
[5] = 119, [6] = 126, [7] = 81, [8] = 83,
[9] = 84,
/* 128 - 130 is a 1 to 1 mapping */
};
enum band_freq band_oper_class_to_band(const uint8_t *country,
uint8_t oper_class)
{
unsigned int i;
int table = 0;
if (country && country[2] >= 1 && country[2] <= 5)
table = country[2];
else if (country) {
for (i = 0; i < L_ARRAY_SIZE(oper_class_us_codes); i++)
if (!memcmp(oper_class_us_codes[i], country, 2)) {
/* Use table E-1 */
table = 1;
break;
}
for (i = 0; i < L_ARRAY_SIZE(oper_class_eu_codes); i++)
if (!memcmp(oper_class_eu_codes[i], country, 2)) {
/* Use table E-2 */
table = 2;
break;
}
if (!memcmp("JP", country, 2))
/* Use table E-3 */
table = 3;
if (!memcmp("CN", country, 2))
/* Use table E-5 */
table = 5;
}
switch (table) {
case 1:
if (oper_class < L_ARRAY_SIZE(oper_class_us_to_global))
oper_class = oper_class_us_to_global[oper_class];
break;
case 2:
if (oper_class < L_ARRAY_SIZE(oper_class_eu_to_global))
oper_class = oper_class_eu_to_global[oper_class];
break;
case 3:
if (oper_class < L_ARRAY_SIZE(oper_class_jp_to_global))
oper_class = oper_class_jp_to_global[oper_class];
break;
case 5:
if (oper_class < L_ARRAY_SIZE(oper_class_cn_to_global))
oper_class = oper_class_cn_to_global[oper_class];
break;
}
if (oper_class < L_ARRAY_SIZE(oper_class_to_band_global))
return oper_class_to_band_global[oper_class];
else
return 0;
}

10
src/band.h
View File

@ -36,6 +36,11 @@ enum band_chandef_width {
BAND_CHANDEF_WIDTH_160,
};
enum band_freq {
BAND_FREQ_2_4_GHZ = 0x1,
BAND_FREQ_5_GHZ = 0x2,
};
struct band_chandef {
uint32_t frequency;
uint32_t channel_width;
@ -76,3 +81,8 @@ int oci_to_frequency(uint32_t operating_class, uint32_t channel);
int oci_verify(const uint8_t oci[static 3], const struct band_chandef *own);
int oci_from_chandef(const struct band_chandef *own, uint8_t oci[static 3]);
uint8_t band_freq_to_channel(uint32_t freq, enum band_freq *out_band);
uint32_t band_channel_to_freq(uint8_t channel, enum band_freq band);
enum band_freq band_oper_class_to_band(const uint8_t *country,
uint8_t oper_class);