Here's a screenshot:
mcgrof@pogo ~ $ iw event
mcgrof@pogo ~ $ sudo iw dev wlan0 scan trigger
phy #0: beacon hint:
phy0 5180 MHz [36]:
o active scanning enabled
o beaconing enabled
You'll see this on every channel you find a beacon and a flag
is lifted.
Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>
---
This patch was sitting in a cave lonely since March 31st, seems we forgot
about it it, poor patch. I rebased it.
event.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 69 insertions(+), 0 deletions(-)
diff --git a/event.c b/event.c
index 2671331..0cd3c75 100644
--- a/event.c
+++ b/event.c
@@ -9,6 +9,38 @@ static int no_seq_check(struct nl_msg *msg, void *arg)
return NL_OK;
}
+struct ieee80211_beacon_channel {
+ __u16 center_freq;
+ bool passive_scan;
+ bool no_ibss;
+};
+
+static int parse_beacon_hint_chan(struct nlattr *tb,
+ struct ieee80211_beacon_channel *chan)
+{
+ struct nlattr *tb_freq[NL80211_FREQUENCY_ATTR_MAX + 1];
+ static struct nla_policy beacon_freq_policy[NL80211_FREQUENCY_ATTR_MAX + 1] = {
+ [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 },
+ [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG },
+ [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG },
+ };
+
+ if (nla_parse_nested(tb_freq,
+ NL80211_FREQUENCY_ATTR_MAX,
+ tb,
+ beacon_freq_policy))
+ return -EINVAL;
+
+ chan->center_freq = nla_get_u32(tb_freq[NL80211_FREQUENCY_ATTR_FREQ]);
+
+ if (tb_freq[NL80211_FREQUENCY_ATTR_PASSIVE_SCAN])
+ chan->passive_scan = true;
+ if (tb_freq[NL80211_FREQUENCY_ATTR_NO_IBSS])
+ chan->no_ibss = true;
+
+ return 0;
+}
+
static void print_frame(struct print_event_args *args, struct nlattr *attr)
{
uint8_t *frame;
@@ -70,12 +102,21 @@ static void print_frame(struct print_event_args *args, struct nlattr *attr)
static int print_event(struct nl_msg *msg, void *arg)
{
+#define PARSE_BEACON_CHAN(_attr, _chan) do { \
+ r = parse_beacon_hint_chan(tb[_attr], \
+ &_chan); \
+ if (r) \
+ return NL_SKIP; \
+} while (0)
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *tb[NL80211_ATTR_MAX + 1], *nst;
struct print_event_args *args = arg;
char ifname[100];
char macbuf[6*3];
__u8 reg_type;
+ struct ieee80211_beacon_channel chan_before_beacon, chan_after_beacon;
+ __u32 wiphy_idx = 0;
+ int r;
int rem_nst;
__u16 status;
@@ -159,6 +200,33 @@ static int print_event(struct nl_msg *msg, void *arg)
printf("\n");
break;
+ case NL80211_CMD_REG_BEACON_HINT:
+
+ wiphy_idx = nla_get_u32(tb[NL80211_ATTR_WIPHY]);
+
+ memset(&chan_before_beacon, 0, sizeof(chan_before_beacon));
+ memset(&chan_after_beacon, 0, sizeof(chan_after_beacon));
+
+ PARSE_BEACON_CHAN(NL80211_ATTR_FREQ_BEFORE, chan_before_beacon);
+ PARSE_BEACON_CHAN(NL80211_ATTR_FREQ_AFTER, chan_after_beacon);
+
+ if (chan_before_beacon.center_freq != chan_after_beacon.center_freq)
+ break;
+
+ /* A beacon hint is sent _only_ if something _did_ change */
+ printf("beacon hint:\n");
+
+ printf("phy%d %d MHz [%d]:\n",
+ wiphy_idx,
+ chan_before_beacon.center_freq,
+ ieee80211_frequency_to_channel(chan_before_beacon.center_freq));
+
+ if (chan_before_beacon.passive_scan && !chan_after_beacon.passive_scan)
+ printf("\to active scanning enabled\n");
+ if (chan_before_beacon.no_ibss && !chan_after_beacon.no_ibss)
+ printf("\to beaconing enabled\n");
+
+ break;
case NL80211_CMD_JOIN_IBSS:
mac_addr_n2a(macbuf, nla_data(tb[NL80211_ATTR_MAC]));
printf("IBSS %s joined\n", macbuf);
@@ -236,6 +304,7 @@ static int print_event(struct nl_msg *msg, void *arg)
}
return NL_SKIP;
+#undef PARSE_BEACON_CHAN
}
struct wait_event {
--
1.6.3.3
--
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