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nl80211util: Add chandef parser

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Parse chandef elements from NL80211_CMD_GET_INTERFACE.  This provides
information on the current operating channel.
This commit is contained in:
Denis Kenzior 2021-09-18 14:19:41 -05:00
parent 5e631c8af8
commit 85a6fc25f1
3 changed files with 50 additions and 0 deletions
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16
src/band.h
View File

@ -27,6 +27,22 @@ enum ofdm_channel_width {
OFDM_CHANNEL_WIDTH_160MHZ,
};
enum band_chandef_width {
BAND_CHANDEF_WIDTH_20NOHT = 0,
BAND_CHANDEF_WIDTH_20,
BAND_CHANDEF_WIDTH_40,
BAND_CHANDEF_WIDTH_80,
BAND_CHANDEF_WIDTH_80P80,
BAND_CHANDEF_WIDTH_160,
};
struct band_chandef {
uint32_t frequency;
uint32_t channel_width;
uint32_t center1_frequency;
uint32_t center2_frequency;
};
struct band {
uint8_t vht_mcs_set[8];
uint8_t vht_capabilities[4];

30
src/nl80211util.c
View File

@ -31,6 +31,7 @@
#include "linux/nl80211.h"
#include "src/nl80211util.h"
#include "src/band.h"
typedef bool (*attr_handler)(const void *data, uint16_t len, void *o);
@ -138,6 +139,11 @@ static attr_handler handler_for_type(enum nl80211_attrs type)
case NL80211_ATTR_ACK:
return extract_flag;
case NL80211_ATTR_WIPHY_FREQ:
case NL80211_ATTR_WIPHY_FREQ_OFFSET:
case NL80211_ATTR_WIPHY_CHANNEL_TYPE:
case NL80211_ATTR_CHANNEL_WIDTH:
case NL80211_ATTR_CENTER_FREQ1:
case NL80211_ATTR_CENTER_FREQ2:
return extract_uint32;
default:
break;
@ -430,3 +436,27 @@ struct l_genl_msg *nl80211_build_cmd_frame(uint32_t ifindex,
return msg;
}
int nl80211_parse_chandef(struct l_genl_msg *msg, struct band_chandef *out)
{
struct band_chandef t;
if (nl80211_parse_attrs(msg,
NL80211_ATTR_WIPHY_FREQ, &t.frequency,
NL80211_ATTR_CHANNEL_WIDTH, &t.channel_width,
NL80211_ATTR_CENTER_FREQ1, &t.center1_frequency,
NL80211_ATTR_UNSPEC) < 0)
return -ENOENT;
t.center2_frequency = 0;
/* Try to parse CENTER_FREQ2, but it is given only for 80P80 */
if (t.channel_width == NL80211_CHAN_WIDTH_80P80 &&
nl80211_parse_attrs(msg,
NL80211_ATTR_CENTER_FREQ2, &t.center2_frequency,
NL80211_ATTR_UNSPEC) < 0)
return -ENOENT;
memcpy(out, &t, sizeof(t));
return 0;
}

4
src/nl80211util.h
View File

@ -22,6 +22,8 @@
#include <ell/ell.h>
struct band_chandef;
int nl80211_parse_attrs(struct l_genl_msg *msg, int tag, ...);
struct l_genl_msg *nl80211_build_new_key_group(uint32_t ifindex,
@ -51,3 +53,5 @@ struct l_genl_msg *nl80211_build_cmd_frame(uint32_t ifindex,
uint32_t freq,
struct iovec *iov,
size_t iov_len);
int nl80211_parse_chandef(struct l_genl_msg *msg, struct band_chandef *out);