Add generic operating class and channel to frequency function

ieee80211_chan_to_freq() is a generic function that replaces and extends
the previous P2P-specific p2p_channel_to_freq(). The new function
supports both the global operating class table as well as the additional
US, EU, JP, and CN operating class tables.

Signed-off-by: Jouni Malinen <j@w1.fi>

diff --git a/src/common/ieee802_11_common.c b/src/common/ieee802_11_common.c
index 7b06b77..e1d45cf 100644 (file)
--- a/src/common/ieee802_11_common.c
+++ b/src/common/ieee802_11_common.c
@@ -537,6 +537,286 @@ enum hostapd_hw_mode ieee80211_freq_to_chan(int freq, u8 *channel)
 }
 
 
+static const char *us_op_class_cc[] = {
+       "US", "CA", NULL
+};
+
+static const char *eu_op_class_cc[] = {
+       "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", NULL
+};
+
+static const char *jp_op_class_cc[] = {
+       "JP", NULL
+};
+
+static const char *cn_op_class_cc[] = {
+       "CN", "CA", NULL
+};
+
+
+static int country_match(const char *cc[], const char *country)
+{
+       int i;
+
+       if (country == NULL)
+               return 0;
+       for (i = 0; cc[i]; i++) {
+               if (cc[i][0] == country[0] && cc[i][1] == country[1])
+                       return 1;
+       }
+
+       return 0;
+}
+
+
+static int ieee80211_chan_to_freq_us(u8 op_class, u8 chan)
+{
+       switch (op_class) {
+       case 12: /* channels 1..11 */
+       case 32: /* channels 1..7; 40 MHz */
+       case 33: /* channels 5..11; 40 MHz */
+               if (chan < 1 || chan > 11)
+                       return -1;
+               return 2407 + 5 * chan;
+       case 1: /* channels 36,40,44,48 */
+       case 2: /* channels 52,56,60,64; dfs */
+       case 22: /* channels 36,44; 40 MHz */
+       case 23: /* channels 52,60; 40 MHz */
+       case 27: /* channels 40,48; 40 MHz */
+       case 28: /* channels 56,64; 40 MHz */
+               if (chan < 36 || chan > 64)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 4: /* channels 100-144 */
+       case 24: /* channels 100-140; 40 MHz */
+               if (chan < 100 || chan > 144)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 3: /* channels 149,153,157,161 */
+       case 25: /* channels 149,157; 40 MHz */
+       case 26: /* channels 149,157; 40 MHz */
+       case 30: /* channels 153,161; 40 MHz */
+       case 31: /* channels 153,161; 40 MHz */
+               if (chan < 149 || chan > 161)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 34: /* 60 GHz band, channels 1..3 */
+               if (chan < 1 || chan > 3)
+                       return -1;
+               return 56160 + 2160 * chan;
+       }
+       return -1;
+}
+
+
+static int ieee80211_chan_to_freq_eu(u8 op_class, u8 chan)
+{
+       switch (op_class) {
+       case 4: /* channels 1..13 */
+       case 11: /* channels 1..9; 40 MHz */
+       case 12: /* channels 5..13; 40 MHz */
+               if (chan < 1 || chan > 13)
+                       return -1;
+               return 2407 + 5 * chan;
+       case 1: /* channels 36,40,44,48 */
+       case 2: /* channels 52,56,60,64; dfs */
+       case 5: /* channels 36,44; 40 MHz */
+       case 6: /* channels 52,60; 40 MHz */
+       case 8: /* channels 40,48; 40 MHz */
+       case 9: /* channels 56,64; 40 MHz */
+               if (chan < 36 || chan > 64)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 3: /* channels 100-140 */
+       case 7: /* channels 100-132; 40 MHz */
+       case 10: /* channels 104-136; 40 MHz */
+       case 16: /* channels 100-140 */
+               if (chan < 100 || chan > 140)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 17: /* channels 149,153,157,161,165,169 */
+               if (chan < 149 || chan > 169)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 18: /* 60 GHz band, channels 1..4 */
+               if (chan < 1 || chan > 4)
+                       return -1;
+               return 56160 + 2160 * chan;
+       }
+       return -1;
+}
+
+
+static int ieee80211_chan_to_freq_jp(u8 op_class, u8 chan)
+{
+       switch (op_class) {
+       case 30: /* channels 1..13 */
+       case 56: /* channels 1..9; 40 MHz */
+       case 57: /* channels 5..13; 40 MHz */
+               if (chan < 1 || chan > 13)
+                       return -1;
+               return 2407 + 5 * chan;
+       case 31: /* channel 14 */
+               if (chan != 14)
+                       return -1;
+               return 2414 + 5 * chan;
+       case 1: /* channels 34,38,42,46(old) or 36,40,44,48 */
+       case 32: /* channels 52,56,60,64 */
+       case 33: /* channels 52,56,60,64 */
+       case 36: /* channels 36,44; 40 MHz */
+       case 37: /* channels 52,60; 40 MHz */
+       case 38: /* channels 52,60; 40 MHz */
+       case 41: /* channels 40,48; 40 MHz */
+       case 42: /* channels 56,64; 40 MHz */
+       case 43: /* channels 56,64; 40 MHz */
+               if (chan < 34 || chan > 64)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 34: /* channels 100-140 */
+       case 35: /* channels 100-140 */
+       case 39: /* channels 100-132; 40 MHz */
+       case 40: /* channels 100-132; 40 MHz */
+       case 44: /* channels 104-136; 40 MHz */
+       case 45: /* channels 104-136; 40 MHz */
+       case 58: /* channels 100-140 */
+               if (chan < 100 || chan > 140)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 59: /* 60 GHz band, channels 1..4 */
+               if (chan < 1 || chan > 3)
+                       return -1;
+               return 56160 + 2160 * chan;
+       }
+       return -1;
+}
+
+
+static int ieee80211_chan_to_freq_cn(u8 op_class, u8 chan)
+{
+       switch (op_class) {
+       case 7: /* channels 1..13 */
+       case 8: /* channels 1..9; 40 MHz */
+       case 9: /* channels 5..13; 40 MHz */
+               if (chan < 1 || chan > 13)
+                       return -1;
+               return 2407 + 5 * chan;
+       case 1: /* channels 36,40,44,48 */
+       case 2: /* channels 52,56,60,64; dfs */
+       case 4: /* channels 36,44; 40 MHz */
+       case 5: /* channels 52,60; 40 MHz */
+               if (chan < 36 || chan > 64)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 3: /* channels 149,153,157,161,165 */
+       case 6: /* channels 149,157; 40 MHz */
+               if (chan < 149 || chan > 165)
+                       return -1;
+               return 5000 + 5 * chan;
+       }
+       return -1;
+}
+
+
+static int ieee80211_chan_to_freq_global(u8 op_class, u8 chan)
+{
+       /* Table E-4 in IEEE Std 802.11-2012 - Global operating classes */
+       switch (op_class) {
+       case 81:
+               /* channels 1..13 */
+               if (chan < 1 || chan > 13)
+                       return -1;
+               return 2407 + 5 * chan;
+       case 82:
+               /* channel 14 */
+               if (chan != 14)
+                       return -1;
+               return 2414 + 5 * chan;
+       case 83: /* channels 1..9; 40 MHz */
+       case 84: /* channels 5..13; 40 MHz */
+               if (chan < 1 || chan > 13)
+                       return -1;
+               return 2407 + 5 * chan;
+       case 115: /* channels 36,40,44,48; indoor only */
+       case 116: /* channels 36,44; 40 MHz; indoor only */
+       case 117: /* channels 40,48; 40 MHz; indoor only */
+       case 118: /* channels 52,56,60,64; dfs */
+       case 119: /* channels 52,60; 40 MHz; dfs */
+       case 120: /* channels 56,64; 40 MHz; dfs */
+               if (chan < 36 || chan > 64)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 121: /* channels 100-140 */
+       case 122: /* channels 100-142; 40 MHz */
+       case 123: /* channels 104-136; 40 MHz */
+               if (chan < 100 || chan > 140)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 124: /* channels 149,153,157,161 */
+       case 125: /* channels 149,153,157,161,165,169 */
+       case 126: /* channels 149,157; 40 MHz */
+       case 127: /* channels 153,161; 40 MHz */
+               if (chan < 149 || chan > 161)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 128: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
+       case 130: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
+               if (chan < 36 || chan > 161)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 129: /* center freqs 50, 114; 160 MHz */
+               if (chan < 50 || chan > 114)
+                       return -1;
+               return 5000 + 5 * chan;
+       case 180: /* 60 GHz band, channels 1..4 */
+               if (chan < 1 || chan > 4)
+                       return -1;
+               return 56160 + 2160 * chan;
+       }
+       return -1;
+}
+
+/**
+ * ieee80211_chan_to_freq - Convert channel info to frequency
+ * @country: Country code, if known; otherwise, global operating class is used
+ * @op_class: Operating class
+ * @chan: Channel number
+ * Returns: Frequency in MHz or -1 if the specified channel is unknown
+ */
+int ieee80211_chan_to_freq(const char *country, u8 op_class, u8 chan)
+{
+       int freq;
+
+       if (country_match(us_op_class_cc, country)) {
+               freq = ieee80211_chan_to_freq_us(op_class, chan);
+               if (freq > 0)
+                       return freq;
+       }
+
+       if (country_match(eu_op_class_cc, country)) {
+               freq = ieee80211_chan_to_freq_eu(op_class, chan);
+               if (freq > 0)
+                       return freq;
+       }
+
+       if (country_match(jp_op_class_cc, country)) {
+               freq = ieee80211_chan_to_freq_jp(op_class, chan);
+               if (freq > 0)
+                       return freq;
+       }
+
+       if (country_match(cn_op_class_cc, country)) {
+               freq = ieee80211_chan_to_freq_cn(op_class, chan);
+               if (freq > 0)
+                       return freq;
+       }
+
+       return ieee80211_chan_to_freq_global(op_class, chan);
+}
+
+
 static int is_11b(u8 rate)
 {
        return rate == 0x02 || rate == 0x04 || rate == 0x0b || rate == 0x16;

diff --git a/src/common/ieee802_11_common.h b/src/common/ieee802_11_common.h
index 8d96dc2..2357afc 100644 (file)
--- a/src/common/ieee802_11_common.h
+++ b/src/common/ieee802_11_common.h
@@ -105,6 +105,7 @@ struct hostapd_wmm_ac_params {
 int hostapd_config_wmm_ac(struct hostapd_wmm_ac_params wmm_ac_params[],
                          const char *name, const char *val);
 enum hostapd_hw_mode ieee80211_freq_to_chan(int freq, u8 *channel);
+int ieee80211_chan_to_freq(const char *country, u8 op_class, u8 chan);
 
 int supp_rates_11b_only(struct ieee802_11_elems *elems);
 

diff --git a/src/p2p/p2p_utils.c b/src/p2p/p2p_utils.c
index 615cce4..5bdacf1 100644 (file)
--- a/src/p2p/p2p_utils.c
+++ b/src/p2p/p2p_utils.c
@@ -9,6 +9,7 @@
 #include "includes.h"
 
 #include "common.h"
+#include "common/ieee802_11_common.h"
 #include "p2p_i.h"
 
 
@@ -54,56 +55,7 @@ int p2p_random(char *buf, size_t len)
  */
 int p2p_channel_to_freq(int op_class, int channel)
 {
-       /* Table E-4 in IEEE Std 802.11-2012 - Global operating classes */
-       /* TODO: more operating classes */
-       switch (op_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;
-       case 128: /* center freqs 42, 58, 106, 122, 138, 155; 80 MHz */
-               if (channel < 36 || channel > 161)
-                       return -1;
-               return 5000 + 5 * channel;
-       case 180: /* 60 GHz band, channels 1..4 */
-               if (channel < 1 || channel > 4)
-                       return -1;
-               return 56160 + 2160 * channel;
-       }
-       return -1;
+       return ieee80211_chan_to_freq(NULL, op_class, channel);
 }