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wifi: mac80211: mlme: refactor assoc link setup 

Factor out the code to set up the assoc link into a
new function ieee80211_setup_assoc_link().

While at it, also modify the 'override' handling to
just take into account whether or not the conn_flags
were changed, which is what we need to setup again
the channel later.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2022-07-12 15:21:23 +02:00
parent a857c21eaf
commit 1845c1d4a4
1 changed files with 156 additions and 130 deletions
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286
net/mac80211/mlme.c
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@ -6145,22 +6145,138 @@ int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
return err;
}
static ieee80211_conn_flags_t
ieee80211_setup_assoc_link(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgd_assoc_data *assoc_data,
struct cfg80211_assoc_request *req,
ieee80211_conn_flags_t conn_flags)
{
struct ieee80211_local *local = sdata->local;
const struct cfg80211_bss_ies *beacon_ies;
struct ieee80211_supported_band *sband;
const struct element *ht_elem, *vht_elem;
struct ieee80211_link_data *link = &sdata->deflink;
struct cfg80211_bss *cbss = req->bss;
struct ieee80211_bss *bss = (void *)cbss->priv;
bool is_5ghz, is_6ghz;
sband = local->hw.wiphy->bands[cbss->channel->band];
if (WARN_ON(!sband))
return false;
is_5ghz = cbss->channel->band == NL80211_BAND_5GHZ;
is_6ghz = cbss->channel->band == NL80211_BAND_6GHZ;
assoc_data->supp_rates = bss->supp_rates;
assoc_data->supp_rates_len = bss->supp_rates_len;
rcu_read_lock();
ht_elem = ieee80211_bss_get_elem(cbss, WLAN_EID_HT_OPERATION);
if (ht_elem && ht_elem->datalen >= sizeof(struct ieee80211_ht_operation))
assoc_data->ap_ht_param =
((struct ieee80211_ht_operation *)(ht_elem->data))->ht_param;
else if (!is_6ghz)
conn_flags |= IEEE80211_CONN_DISABLE_HT;
vht_elem = ieee80211_bss_get_elem(cbss, WLAN_EID_VHT_CAPABILITY);
if (vht_elem && vht_elem->datalen >= sizeof(struct ieee80211_vht_cap)) {
memcpy(&assoc_data->ap_vht_cap, vht_elem->data,
sizeof(struct ieee80211_vht_cap));
} else if (is_5ghz) {
link_info(link,
"VHT capa missing/short, disabling VHT/HE/EHT\n");
conn_flags |= IEEE80211_CONN_DISABLE_VHT |
IEEE80211_CONN_DISABLE_HE |
IEEE80211_CONN_DISABLE_EHT;
}
rcu_read_unlock();
link->u.mgd.beacon_crc_valid = false;
link->u.mgd.dtim_period = 0;
link->u.mgd.have_beacon = false;
/* override HT/VHT configuration only if the AP and we support it */
if (!(conn_flags & IEEE80211_CONN_DISABLE_HT)) {
struct ieee80211_sta_ht_cap sta_ht_cap;
memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
}
rcu_read_lock();
beacon_ies = rcu_dereference(cbss->beacon_ies);
if (beacon_ies) {
const struct element *elem;
u8 dtim_count = 0;
ieee80211_get_dtim(beacon_ies, &dtim_count,
&link->u.mgd.dtim_period);
sdata->deflink.u.mgd.have_beacon = true;
if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
link->conf->sync_tsf = beacon_ies->tsf;
link->conf->sync_device_ts = bss->device_ts_beacon;
link->conf->sync_dtim_count = dtim_count;
}
elem = cfg80211_find_ext_elem(WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION,
beacon_ies->data, beacon_ies->len);
if (elem && elem->datalen >= 3)
link->conf->profile_periodicity = elem->data[2];
else
link->conf->profile_periodicity = 0;
elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY,
beacon_ies->data, beacon_ies->len);
if (elem && elem->datalen >= 11 &&
(elem->data[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
link->conf->ema_ap = true;
else
link->conf->ema_ap = false;
}
rcu_read_unlock();
if (bss->corrupt_data) {
char *corrupt_type = "data";
if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
corrupt_type = "beacon and probe response";
else
corrupt_type = "beacon";
} else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP) {
corrupt_type = "probe response";
}
sdata_info(sdata, "associating to AP %pM with corrupt %s\n",
cbss->bssid, corrupt_type);
}
if (link->u.mgd.req_smps == IEEE80211_SMPS_AUTOMATIC) {
if (sdata->u.mgd.powersave)
link->smps_mode = IEEE80211_SMPS_DYNAMIC;
else
link->smps_mode = IEEE80211_SMPS_OFF;
} else {
link->smps_mode = link->u.mgd.req_smps;
}
return conn_flags;
}
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
struct cfg80211_assoc_request *req)
{
bool is_6ghz = req->bss->channel->band == NL80211_BAND_6GHZ;
bool is_5ghz = req->bss->channel->band == NL80211_BAND_5GHZ;
struct ieee80211_local *local = sdata->local;
struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
struct ieee80211_bss *bss = (void *)req->bss->priv;
struct ieee80211_mgd_assoc_data *assoc_data;
const struct cfg80211_bss_ies *beacon_ies;
struct ieee80211_supported_band *sband;
struct ieee80211_vif_cfg *vif_cfg = &sdata->vif.cfg;
const struct element *ssid_elem, *ht_elem, *vht_elem;
const struct element *ssid_elem;
struct ieee80211_link_data *link = &sdata->deflink;
ieee80211_conn_flags_t conn_flags = 0;
int i, err;
bool override = false;
bool override;
assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
if (!assoc_data)
@ -6216,8 +6332,6 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
/* prepare assoc data */
link->u.mgd.beacon_crc_valid = false;
assoc_data->wmm = bss->wmm_used &&
(local->hw.queues >= IEEE80211_NUM_ACS);
@ -6232,27 +6346,44 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_HT;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_VHT;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_HE;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_EHT;
conn_flags |= IEEE80211_CONN_DISABLE_HT;
conn_flags |= IEEE80211_CONN_DISABLE_VHT;
conn_flags |= IEEE80211_CONN_DISABLE_HE;
conn_flags |= IEEE80211_CONN_DISABLE_EHT;
netdev_info(sdata->dev,
"disabling HT/VHT/HE due to WEP/TKIP use\n");
}
}
sband = local->hw.wiphy->bands[req->bss->channel->band];
/* also disable HT/VHT/HE/EHT if the AP doesn't use WMM */
if (!bss->wmm_used) {
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_HT;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_VHT;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_HE;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_EHT;
conn_flags |= IEEE80211_CONN_DISABLE_HT;
conn_flags |= IEEE80211_CONN_DISABLE_VHT;
conn_flags |= IEEE80211_CONN_DISABLE_HE;
conn_flags |= IEEE80211_CONN_DISABLE_EHT;
netdev_info(sdata->dev,
"disabling HT/VHT/HE as WMM/QoS is not supported by the AP\n");
}
if (req->flags & ASSOC_REQ_DISABLE_HT) {
mlme_dbg(sdata, "HT disabled by flag, disabling HT/VHT/HE\n");
conn_flags |= IEEE80211_CONN_DISABLE_HT;
conn_flags |= IEEE80211_CONN_DISABLE_VHT;
conn_flags |= IEEE80211_CONN_DISABLE_HE;
conn_flags |= IEEE80211_CONN_DISABLE_EHT;
}
if (req->flags & ASSOC_REQ_DISABLE_VHT) {
mlme_dbg(sdata, "VHT disabled by flag, disabling VHT\n");
conn_flags |= IEEE80211_CONN_DISABLE_VHT;
}
if (req->flags & ASSOC_REQ_DISABLE_HE) {
mlme_dbg(sdata, "HE disabled by flag, disabling HE/EHT\n");
conn_flags |= IEEE80211_CONN_DISABLE_HE;
conn_flags |= IEEE80211_CONN_DISABLE_EHT;
}
memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
sizeof(ifmgd->ht_capa_mask));
@ -6287,28 +6418,15 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
assoc_data->bss = req->bss;
assoc_data->capability = req->bss->capability;
assoc_data->supp_rates = bss->supp_rates;
assoc_data->supp_rates_len = bss->supp_rates_len;
rcu_read_lock();
ht_elem = ieee80211_bss_get_elem(req->bss, WLAN_EID_HT_OPERATION);
if (ht_elem && ht_elem->datalen >= sizeof(struct ieee80211_ht_operation))
assoc_data->ap_ht_param =
((struct ieee80211_ht_operation *)(ht_elem->data))->ht_param;
else if (!is_6ghz)
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_HT;
vht_elem = ieee80211_bss_get_elem(req->bss, WLAN_EID_VHT_CAPABILITY);
if (vht_elem && vht_elem->datalen >= sizeof(struct ieee80211_vht_cap)) {
memcpy(&assoc_data->ap_vht_cap, vht_elem->data,
sizeof(struct ieee80211_vht_cap));
} else if (is_5ghz) {
sdata_info(sdata,
"VHT capa missing/short, disabling VHT/HE/EHT\n");
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_VHT |
IEEE80211_CONN_DISABLE_HE |
IEEE80211_CONN_DISABLE_EHT;
}
rcu_read_unlock();
/* default timeout */
assoc_data->timeout = jiffies;
assoc_data->timeout_started = true;
conn_flags |= ieee80211_setup_assoc_link(sdata, assoc_data, req,
conn_flags);
override = link->u.mgd.conn_flags != conn_flags;
link->u.mgd.conn_flags |= conn_flags;
if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
@ -6352,50 +6470,7 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
sdata->control_port_no_preauth = req->crypto.control_port_no_preauth;
/* kick off associate process */
ifmgd->assoc_data = assoc_data;
link->u.mgd.dtim_period = 0;
link->u.mgd.have_beacon = false;
/* override HT/VHT configuration only if the AP and we support it */
if (!(link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_HT)) {
struct ieee80211_sta_ht_cap sta_ht_cap;
if (req->flags & ASSOC_REQ_DISABLE_HT)
override = true;
memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);
/* check for 40 MHz disable override */
if (!(link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_40MHZ) &&
sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
!(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
override = true;
if (!(link->u.mgd.conn_flags & IEEE80211_CONN_DISABLE_VHT) &&
req->flags & ASSOC_REQ_DISABLE_VHT)
override = true;
}
if (req->flags & ASSOC_REQ_DISABLE_HT) {
mlme_dbg(sdata, "HT disabled by flag, disabling HT/VHT/HE\n");
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_HT;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_VHT;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_HE;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_EHT;
}
if (req->flags & ASSOC_REQ_DISABLE_VHT) {
mlme_dbg(sdata, "VHT disabled by flag, disabling VHT\n");
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_VHT;
}
if (req->flags & ASSOC_REQ_DISABLE_HE) {
mlme_dbg(sdata, "HE disabled by flag, disabling HE/EHT\n");
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_HE;
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_EHT;
}
if (req->flags & ASSOC_REQ_DISABLE_EHT)
link->u.mgd.conn_flags |= IEEE80211_CONN_DISABLE_EHT;
@ -6427,60 +6502,11 @@ int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
assoc_data->timeout_started = true;
assoc_data->need_beacon = true;
} else if (beacon_ies) {
const struct element *elem;
u8 dtim_count = 0;
ieee80211_get_dtim(beacon_ies, &dtim_count,
&link->u.mgd.dtim_period);
link->u.mgd.have_beacon = true;
assoc_data->timeout = jiffies;
assoc_data->timeout_started = true;
if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
link->conf->sync_tsf = beacon_ies->tsf;
link->conf->sync_device_ts =
bss->device_ts_beacon;
link->conf->sync_dtim_count = dtim_count;
}
elem = cfg80211_find_ext_elem(WLAN_EID_EXT_MULTIPLE_BSSID_CONFIGURATION,
beacon_ies->data, beacon_ies->len);
if (elem && elem->datalen >= 3)
link->conf->profile_periodicity = elem->data[2];
else
link->conf->profile_periodicity = 0;
elem = cfg80211_find_elem(WLAN_EID_EXT_CAPABILITY,
beacon_ies->data, beacon_ies->len);
if (elem && elem->datalen >= 11 &&
(elem->data[10] & WLAN_EXT_CAPA11_EMA_SUPPORT))
link->conf->ema_ap = true;
else
link->conf->ema_ap = false;
} else {
assoc_data->timeout = jiffies;
assoc_data->timeout_started = true;
}
rcu_read_unlock();
run_again(sdata, assoc_data->timeout);
if (bss->corrupt_data) {
char *corrupt_type = "data";
if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
if (bss->corrupt_data &
IEEE80211_BSS_CORRUPT_PROBE_RESP)
corrupt_type = "beacon and probe response";
else
corrupt_type = "beacon";
} else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
corrupt_type = "probe response";
sdata_info(sdata, "associating with AP with corrupt %s\n",
corrupt_type);
}
return 0;
err_clear:
eth_zero_addr(sdata->deflink.u.mgd.bssid);