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iwm: fix scanning for hidden SSIDs.

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Setup SSIDs in scan command so firmware will send direct probe request(s)
while scanning.

Tested by:	dbkirk@gmail.com

PR:		211519
MFC after:	1 week
This commit is contained in:
Andriy Voskoboinyk 2016-09-06 10:08:32 +00:00
parent 337b148e02
commit 9afea60f98
2 changed files with 42 additions and 35 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

74
sys/dev/iwm/if_iwm_scan.c
View file

@ -265,6 +265,7 @@ iwm_mvm_lmac_scan_fill_channels(struct iwm_softc *sc,
struct iwm_scan_channel_cfg_lmac *chan, int n_ssids)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211_scan_state *ss = ic->ic_scan;
struct ieee80211_channel *c;
uint8_t nchan;
int j;
@ -292,10 +293,11 @@ iwm_mvm_lmac_scan_fill_channels(struct iwm_softc *sc,
chan->iter_count = htole16(1);
chan->iter_interval = htole32(0);
chan->flags = htole32(IWM_UNIFIED_SCAN_CHANNEL_PARTIAL);
#if 0 /* makes scanning while associated less useful */
if (n_ssids != 0)
chan->flags |= htole32(1 << 1); /* select SSID 0 */
#endif
chan->flags |= htole32(IWM_SCAN_CHANNEL_NSSIDS(n_ssids));
/* XXX IEEE80211_SCAN_NOBCAST flag is never set. */
if (!IEEE80211_IS_CHAN_PASSIVE(c) &&
(!(ss->ss_flags & IEEE80211_SCAN_NOBCAST) || n_ssids != 0))
chan->flags |= htole32(IWM_SCAN_CHANNEL_TYPE_ACTIVE);
chan++;
nchan++;
}
@ -334,11 +336,7 @@ iwm_mvm_umac_scan_fill_channels(struct iwm_softc *sc,
chan->channel_num = ieee80211_mhz2ieee(c->ic_freq, 0);
chan->iter_count = 1;
chan->iter_interval = htole16(0);
chan->flags = htole32(0);
#if 0 /* makes scanning while associated less useful */
if (n_ssids != 0)
chan->flags = htole32(1 << 0); /* select SSID 0 */
#endif
chan->flags = htole32(IWM_SCAN_CHANNEL_UMAC_NSSIDS(n_ssids));
chan++;
nchan++;
}
@ -355,13 +353,11 @@ iwm_mvm_fill_probe_req(struct iwm_softc *sc, struct iwm_scan_probe_req *preq)
struct ieee80211_rateset *rs;
size_t remain = sizeof(preq->buf);
uint8_t *frm, *pos;
int ssid_len = 0;
const uint8_t *ssid = NULL;
memset(preq, 0, sizeof(*preq));
/* Ensure enough space for header and SSID IE. */
if (remain < sizeof(*wh) + 2 + ssid_len)
if (remain < sizeof(*wh) + 2)
return ENOBUFS;
/*
@ -378,7 +374,7 @@ iwm_mvm_fill_probe_req(struct iwm_softc *sc, struct iwm_scan_probe_req *preq)
*(uint16_t *)&wh->i_seq[0] = 0; /* filled by HW */
frm = (uint8_t *)(wh + 1);
frm = ieee80211_add_ssid(frm, ssid, ssid_len);
frm = ieee80211_add_ssid(frm, NULL, 0);
/* Tell the firmware where the MAC header is. */
preq->mac_header.offset = 0;
@ -544,11 +540,11 @@ iwm_mvm_umac_scan(struct iwm_softc *sc)
.data = { NULL, },
.flags = IWM_CMD_SYNC,
};
struct ieee80211_scan_state *ss = sc->sc_ic.ic_scan;
struct iwm_scan_req_umac *req;
struct iwm_scan_req_umac_tail *tail;
size_t req_len;
int ssid_len = 0;
const uint8_t *ssid = NULL;
uint8_t i, nssid;
int ret;
req_len = sizeof(struct iwm_scan_req_umac) +
@ -577,8 +573,9 @@ iwm_mvm_umac_scan(struct iwm_softc *sc)
req->scan_priority = htole32(IWM_SCAN_PRIORITY_HIGH);
req->ooc_priority = htole32(IWM_SCAN_PRIORITY_HIGH);
nssid = MIN(ss->ss_nssid, IWM_PROBE_OPTION_MAX);
req->n_channels = iwm_mvm_umac_scan_fill_channels(sc,
(struct iwm_scan_channel_cfg_umac *)req->data, ssid_len != 0);
(struct iwm_scan_channel_cfg_umac *)req->data, nssid);
req->general_flags = htole32(IWM_UMAC_SCAN_GEN_FLAGS_PASS_ALL |
IWM_UMAC_SCAN_GEN_FLAGS_ITER_COMPLETE |
@ -589,15 +586,19 @@ iwm_mvm_umac_scan(struct iwm_softc *sc)
sc->sc_capa_n_scan_channels);
/* Check if we're doing an active directed scan. */
if (ssid_len != 0) {
tail->direct_scan[0].id = IEEE80211_ELEMID_SSID;
tail->direct_scan[0].len = ssid_len;
memcpy(tail->direct_scan[0].ssid, ssid, ssid_len);
for (i = 0; i < nssid; i++) {
tail->direct_scan[i].id = IEEE80211_ELEMID_SSID;
tail->direct_scan[i].len = MIN(ss->ss_ssid[i].len,
IEEE80211_NWID_LEN);
memcpy(tail->direct_scan[i].ssid, ss->ss_ssid[i].ssid,
tail->direct_scan[i].len);
/* XXX debug */
}
if (nssid != 0) {
req->general_flags |=
htole32(IWM_UMAC_SCAN_GEN_FLAGS_PRE_CONNECT);
} else {
} else
req->general_flags |= htole32(IWM_UMAC_SCAN_GEN_FLAGS_PASSIVE);
}
if (isset(sc->sc_enabled_capa,
IWM_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT))
@ -631,11 +632,11 @@ iwm_mvm_lmac_scan(struct iwm_softc *sc)
.data = { NULL, },
.flags = IWM_CMD_SYNC,
};
struct ieee80211_scan_state *ss = sc->sc_ic.ic_scan;
struct iwm_scan_req_lmac *req;
size_t req_len;
uint8_t i, nssid;
int ret;
int ssid_len = 0;
const uint8_t *ssid = NULL;
IWM_DPRINTF(sc, IWM_DEBUG_SCAN,
"Handling ieee80211 scan request\n");
@ -668,11 +669,6 @@ iwm_mvm_lmac_scan(struct iwm_softc *sc)
req->scan_flags = htole32(IWM_MVM_LMAC_SCAN_FLAG_PASS_ALL |
IWM_MVM_LMAC_SCAN_FLAG_ITER_COMPLETE |
IWM_MVM_LMAC_SCAN_FLAG_EXTENDED_DWELL);
if (ssid_len == 0)
req->scan_flags |= htole32(IWM_MVM_LMAC_SCAN_FLAG_PASSIVE);
else
req->scan_flags |=
htole32(IWM_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION);
if (isset(sc->sc_enabled_capa,
IWM_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT))
req->scan_flags |= htole32(IWM_MVM_LMAC_SCAN_FLAGS_RRM_ENABLED);
@ -698,15 +694,23 @@ iwm_mvm_lmac_scan(struct iwm_softc *sc)
req->tx_cmd[1].sta_id = sc->sc_aux_sta.sta_id;
/* Check if we're doing an active directed scan. */
if (ssid_len != 0) {
req->direct_scan[0].id = IEEE80211_ELEMID_SSID;
req->direct_scan[0].len = ssid_len;
memcpy(req->direct_scan[0].ssid, ssid, ssid_len);
nssid = MIN(ss->ss_nssid, IWM_PROBE_OPTION_MAX);
for (i = 0; i < nssid; i++) {
req->direct_scan[i].id = IEEE80211_ELEMID_SSID;
req->direct_scan[i].len = MIN(ss->ss_ssid[i].len,
IEEE80211_NWID_LEN);
memcpy(req->direct_scan[i].ssid, ss->ss_ssid[i].ssid,
req->direct_scan[i].len);
/* XXX debug */
}
if (nssid != 0) {
req->scan_flags |=
htole32(IWM_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION);
} else
req->scan_flags |= htole32(IWM_MVM_LMAC_SCAN_FLAG_PASSIVE);
req->n_channels = iwm_mvm_lmac_scan_fill_channels(sc,
(struct iwm_scan_channel_cfg_lmac *)req->data,
ssid_len != 0);
(struct iwm_scan_channel_cfg_lmac *)req->data, nssid);
ret = iwm_mvm_fill_probe_req(sc,
(struct iwm_scan_probe_req *)(req->data +

3
sys/dev/iwm/if_iwmreg.h
View file

@ -4766,6 +4766,7 @@ struct iwm_scd_txq_cfg_rsp {
/* Masks for iwm_scan_channel.type flags */
#define IWM_SCAN_CHANNEL_TYPE_ACTIVE (1 << 0)
#define IWM_SCAN_CHANNEL_NSSIDS(x) (((1 << (x)) - 1) << 1)
#define IWM_SCAN_CHANNEL_NARROW_BAND (1 << 22)
/* Max number of IEs for direct SSID scans in a command */
@ -5580,6 +5581,8 @@ enum iwm_umac_scan_general_flags {
*/
struct iwm_scan_channel_cfg_umac {
uint32_t flags;
#define IWM_SCAN_CHANNEL_UMAC_NSSIDS(x) ((1 << (x)) - 1)
uint8_t channel_num;
uint8_t iter_count;
uint16_t iter_interval;