Here is a patch for iw to set a ht channel type when joining an IBSS.
diff -Nrup iw-0.9.22/ibss.c iw-0.9.22_ibss_n//ibss.c
--- iw-0.9.22/ibss.c 2011-02-04 13:29:39.000000000 +0100
+++ iw-0.9.22_ibss_n//ibss.c 2011-05-03 21:31:00.000000000 +0200
@@ -27,6 +27,7 @@ static int join_ibss(struct nl80211_stat
char *value = NULL, *sptr = NULL;
float rate;
int bintval;
+ unsigned int htval;
if (argc < 2)
return 1;
@@ -44,6 +45,12 @@ static int join_ibss(struct nl80211_stat
argv++;
argc--;
+ if (argc && parse_channel_type(argv[0], &htval)) {
+ NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE, htval);
+ argv++;
+ argc--;
+ }
+
if (argc && strcmp(argv[0], "fixed-freq") == 0) {
NLA_PUT_FLAG(msg, NL80211_ATTR_FREQ_FIXED);
argv++;
@@ -134,7 +141,7 @@ COMMAND(ibss, leave, NULL,
NL80211_CMD_LEAVE_IBSS, 0, CIB_NETDEV, leave_ibss,
"Leave the current IBSS cell.");
COMMAND(ibss, join,
- "<SSID> <freq in MHz> [fixed-freq] [<fixed bssid>] [beacon-interval <TU>]"
+ "<SSID> <freq in MHz> [HT20|HT40+|HT40-] [fixed-freq] [<fixed bssid>] [beacon-interval <TU>]"
" [basic-rates <rate in Mbps,rate2,...>] [mcast-rate <rate in Mbps>] "
"[key d:0:abcde]",
NL80211_CMD_JOIN_IBSS, 0, CIB_NETDEV, join_ibss,
diff -Nrup iw-0.9.22/iw.h iw-0.9.22_ibss_n//iw.h
--- iw-0.9.22/iw.h 2011-02-04 13:29:39.000000000 +0100
+++ iw-0.9.22_ibss_n//iw.h 2011-05-03 14:52:02.000000000 +0200
@@ -130,6 +130,7 @@ void mac_addr_n2a(char *mac_addr, unsign
unsigned char *parse_hex(char *hex, size_t *outlen);
int parse_keys(struct nl_msg *msg, char **argv, int argc);
+int parse_channel_type(const char *str, unsigned int *htval);
void print_ht_mcs(const __u8 *mcs);
void print_ampdu_length(__u8 exponent);
diff -Nrup iw-0.9.22/phy.c iw-0.9.22_ibss_n//phy.c
--- iw-0.9.22/phy.c 2011-02-04 13:29:39.000000000 +0100
+++ iw-0.9.22_ibss_n//phy.c 2011-05-03 14:52:02.000000000 +0200
@@ -33,30 +33,14 @@ static int handle_freqchan(struct nl_msg
int argc, char **argv)
{
char *end;
- static const struct {
- const char *name;
- unsigned int val;
- } htmap[] = {
- { .name = "HT20", .val = NL80211_CHAN_HT20, },
- { .name = "HT40+", .val = NL80211_CHAN_HT40PLUS, },
- { .name = "HT40-", .val = NL80211_CHAN_HT40MINUS, },
- };
unsigned int htval = NL80211_CHAN_NO_HT;
unsigned int freq;
- int i;
if (!argc || argc > 2)
return 1;
- if (argc == 2) {
- for (i = 0; i < ARRAY_SIZE(htmap); i++) {
- if (strcasecmp(htmap[i].name, argv[1]) == 0) {
- htval = htmap[i].val;
- break;
- }
- }
- if (htval == NL80211_CHAN_NO_HT)
- return 1;
+ if (argc == 2 && !parse_channel_type(argv[1], &htval)) {
+ return 1;
}
if (!*argv[0])
diff -Nrup iw-0.9.22/util.c iw-0.9.22_ibss_n//util.c
--- iw-0.9.22/util.c 2011-02-04 13:29:39.000000000 +0100
+++ iw-0.9.22_ibss_n//util.c 2011-05-03 14:52:02.000000000 +0200
@@ -345,6 +345,33 @@ int parse_keys(struct nl_msg *msg, char
return 2;
}
+/*
+ * Convert a string "HT20", "HT40+" or "HT40-" into nl80211
+ * value. Conversion is case insensitive. Returns 1 on success, 0 on error.
+ */
+
+int parse_channel_type(const char *str, unsigned int *htval)
+{
+ static const struct {
+ const char *name;
+ unsigned int val;
+ } htmap[] = {
+ { .name = "HT20", .val = NL80211_CHAN_HT20, },
+ { .name = "HT40+", .val = NL80211_CHAN_HT40PLUS, },
+ { .name = "HT40-", .val = NL80211_CHAN_HT40MINUS, },
+ };
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(htmap); i++) {
+ if (strcasecmp(htmap[i].name, str) == 0) {
+ *htval = htmap[i].val;
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
static void print_mcs_index(const __u8 *mcs)
{
unsigned int mcs_bit, prev_bit = -2, prev_cont = 0;
--
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