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Diffstat (limited to 'net/mac80211/mesh_plink.c')
-rw-r--r--net/mac80211/mesh_plink.c1087
1 files changed, 607 insertions, 480 deletions
diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index 4b274e9c91a..e8f60aa2e84 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -19,12 +19,6 @@
#define mod_plink_timer(s, t) (mod_timer(&s->plink_timer, \
jiffies + HZ * t / 1000))
-/* We only need a valid sta if user configured a minimum rssi_threshold. */
-#define rssi_threshold_check(sta, sdata) \
- (sdata->u.mesh.mshcfg.rssi_threshold == 0 ||\
- (sta && (s8) -ewma_read(&sta->avg_signal) > \
- sdata->u.mesh.mshcfg.rssi_threshold))
-
enum plink_event {
PLINK_UNDEFINED,
OPN_ACPT,
@@ -37,22 +31,40 @@ enum plink_event {
CLS_IGNR
};
+static const char * const mplstates[] = {
+ [NL80211_PLINK_LISTEN] = "LISTEN",
+ [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
+ [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
+ [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
+ [NL80211_PLINK_ESTAB] = "ESTAB",
+ [NL80211_PLINK_HOLDING] = "HOLDING",
+ [NL80211_PLINK_BLOCKED] = "BLOCKED"
+};
+
+static const char * const mplevents[] = {
+ [PLINK_UNDEFINED] = "NONE",
+ [OPN_ACPT] = "OPN_ACPT",
+ [OPN_RJCT] = "OPN_RJCT",
+ [OPN_IGNR] = "OPN_IGNR",
+ [CNF_ACPT] = "CNF_ACPT",
+ [CNF_RJCT] = "CNF_RJCT",
+ [CNF_IGNR] = "CNF_IGNR",
+ [CLS_ACPT] = "CLS_ACPT",
+ [CLS_IGNR] = "CLS_IGNR"
+};
+
static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
- enum ieee80211_self_protected_actioncode action,
- u8 *da, __le16 llid, __le16 plid, __le16 reason);
+ enum ieee80211_self_protected_actioncode action,
+ u8 *da, u16 llid, u16 plid, u16 reason);
-static inline
-u32 mesh_plink_inc_estab_count(struct ieee80211_sub_if_data *sdata)
-{
- atomic_inc(&sdata->u.mesh.estab_plinks);
- return mesh_accept_plinks_update(sdata);
-}
-static inline
-u32 mesh_plink_dec_estab_count(struct ieee80211_sub_if_data *sdata)
+/* We only need a valid sta if user configured a minimum rssi_threshold. */
+static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta)
{
- atomic_dec(&sdata->u.mesh.estab_plinks);
- return mesh_accept_plinks_update(sdata);
+ s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
+ return rssi_threshold == 0 ||
+ (sta && (s8) -ewma_read(&sta->avg_signal) > rssi_threshold);
}
/**
@@ -70,27 +82,63 @@ static inline void mesh_plink_fsm_restart(struct sta_info *sta)
}
/*
- * Allocate mesh sta entry and insert into station table
+ * mesh_set_short_slot_time - enable / disable ERP short slot time.
+ *
+ * The standard indirectly mandates mesh STAs to turn off short slot time by
+ * disallowing advertising this (802.11-2012 8.4.1.4), but that doesn't mean we
+ * can't be sneaky about it. Enable short slot time if all mesh STAs in the
+ * MBSS support ERP rates.
+ *
+ * Returns BSS_CHANGED_ERP_SLOT or 0 for no change.
*/
-static struct sta_info *mesh_plink_alloc(struct ieee80211_sub_if_data *sdata,
- u8 *hw_addr)
+static u32 mesh_set_short_slot_time(struct ieee80211_sub_if_data *sdata)
{
+ struct ieee80211_local *local = sdata->local;
+ enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
+ struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band];
struct sta_info *sta;
+ u32 erp_rates = 0, changed = 0;
+ int i;
+ bool short_slot = false;
- if (sdata->local->num_sta >= MESH_MAX_PLINKS)
- return NULL;
+ if (band == IEEE80211_BAND_5GHZ) {
+ /* (IEEE 802.11-2012 19.4.5) */
+ short_slot = true;
+ goto out;
+ } else if (band != IEEE80211_BAND_2GHZ ||
+ (band == IEEE80211_BAND_2GHZ &&
+ local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
+ goto out;
- sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
- if (!sta)
- return NULL;
+ for (i = 0; i < sband->n_bitrates; i++)
+ if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G)
+ erp_rates |= BIT(i);
- sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
- sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
- sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
+ if (!erp_rates)
+ goto out;
- set_sta_flag(sta, WLAN_STA_WME);
+ rcu_read_lock();
+ list_for_each_entry_rcu(sta, &local->sta_list, list) {
+ if (sdata != sta->sdata ||
+ sta->plink_state != NL80211_PLINK_ESTAB)
+ continue;
- return sta;
+ short_slot = false;
+ if (erp_rates & sta->sta.supp_rates[band])
+ short_slot = true;
+ else
+ break;
+ }
+ rcu_read_unlock();
+
+out:
+ if (sdata->vif.bss_conf.use_short_slot != short_slot) {
+ sdata->vif.bss_conf.use_short_slot = short_slot;
+ changed = BSS_CHANGED_ERP_SLOT;
+ mpl_dbg(sdata, "mesh_plink %pM: ERP short slot time %d\n",
+ sdata->vif.addr, short_slot);
+ }
+ return changed;
}
/**
@@ -107,12 +155,17 @@ static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_local *local = sdata->local;
struct sta_info *sta;
- u32 changed = 0;
u16 ht_opmode;
bool non_ht_sta = false, ht20_sta = false;
- if (sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT)
+ switch (sdata->vif.bss_conf.chandef.width) {
+ case NL80211_CHAN_WIDTH_20_NOHT:
+ case NL80211_CHAN_WIDTH_5:
+ case NL80211_CHAN_WIDTH_10:
return 0;
+ default:
+ break;
+ }
rcu_read_lock();
list_for_each_entry_rcu(sta, &local->sta_list, list) {
@@ -120,23 +173,19 @@ static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata)
sta->plink_state != NL80211_PLINK_ESTAB)
continue;
- switch (sta->ch_width) {
- case NL80211_CHAN_WIDTH_20_NOHT:
- mpl_dbg(sdata,
- "mesh_plink %pM: nonHT sta (%pM) is present\n",
- sdata->vif.addr, sta->sta.addr);
+ if (sta->sta.bandwidth > IEEE80211_STA_RX_BW_20)
+ continue;
+
+ if (!sta->sta.ht_cap.ht_supported) {
+ mpl_dbg(sdata, "nonHT sta (%pM) is present\n",
+ sta->sta.addr);
non_ht_sta = true;
- goto out;
- case NL80211_CHAN_WIDTH_20:
- mpl_dbg(sdata,
- "mesh_plink %pM: HT20 sta (%pM) is present\n",
- sdata->vif.addr, sta->sta.addr);
- ht20_sta = true;
- default:
break;
}
+
+ mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr);
+ ht20_sta = true;
}
-out:
rcu_read_unlock();
if (non_ht_sta)
@@ -147,16 +196,13 @@ out:
else
ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
- if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
- sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
- sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
- changed = BSS_CHANGED_HT;
- mpl_dbg(sdata,
- "mesh_plink %pM: protection mode changed to %d\n",
- sdata->vif.addr, ht_opmode);
- }
+ if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode)
+ return 0;
- return changed;
+ sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
+ sdata->u.mesh.mshcfg.ht_opmode = ht_opmode;
+ mpl_dbg(sdata, "selected new HT protection mode %d\n", ht_opmode);
+ return BSS_CHANGED_HT;
}
/**
@@ -179,6 +225,10 @@ static u32 __mesh_plink_deactivate(struct sta_info *sta)
sta->plink_state = NL80211_PLINK_BLOCKED;
mesh_path_flush_by_nexthop(sta);
+ ieee80211_mps_sta_status_update(sta);
+ changed |= ieee80211_mps_set_sta_local_pm(sta,
+ NL80211_MESH_POWER_UNKNOWN);
+
return changed;
}
@@ -189,25 +239,26 @@ static u32 __mesh_plink_deactivate(struct sta_info *sta)
*
* All mesh paths with this peer as next hop will be flushed
*/
-void mesh_plink_deactivate(struct sta_info *sta)
+u32 mesh_plink_deactivate(struct sta_info *sta)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
u32 changed;
spin_lock_bh(&sta->lock);
changed = __mesh_plink_deactivate(sta);
- sta->reason = cpu_to_le16(WLAN_REASON_MESH_PEER_CANCELED);
+ sta->reason = WLAN_REASON_MESH_PEER_CANCELED;
mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
sta->sta.addr, sta->llid, sta->plid,
sta->reason);
spin_unlock_bh(&sta->lock);
- ieee80211_bss_info_change_notify(sdata, changed);
+ return changed;
}
static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
- enum ieee80211_self_protected_actioncode action,
- u8 *da, __le16 llid, __le16 plid, __le16 reason) {
+ enum ieee80211_self_protected_actioncode action,
+ u8 *da, u16 llid, u16 plid, u16 reason)
+{
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_tx_info *info;
@@ -232,7 +283,7 @@ static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
2 + 8 + /* peering IE */
sdata->u.mesh.ie_len);
if (!skb)
- return -1;
+ return err;
info = IEEE80211_SKB_CB(skb);
skb_reserve(skb, local->tx_headroom);
mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len);
@@ -254,17 +305,17 @@ static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
if (action == WLAN_SP_MESH_PEERING_CONFIRM) {
/* AID */
pos = skb_put(skb, 2);
- memcpy(pos + 2, &plid, 2);
+ put_unaligned_le16(plid, pos + 2);
}
if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
- mesh_add_rsn_ie(skb, sdata) ||
- mesh_add_meshid_ie(skb, sdata) ||
- mesh_add_meshconf_ie(skb, sdata))
+ mesh_add_rsn_ie(sdata, skb) ||
+ mesh_add_meshid_ie(sdata, skb) ||
+ mesh_add_meshconf_ie(sdata, skb))
goto free;
} else { /* WLAN_SP_MESH_PEERING_CLOSE */
info->flags |= IEEE80211_TX_CTL_NO_ACK;
- if (mesh_add_meshid_ie(skb, sdata))
+ if (mesh_add_meshid_ie(sdata, skb))
goto free;
}
@@ -296,24 +347,24 @@ static int mesh_plink_frame_tx(struct ieee80211_sub_if_data *sdata,
*pos++ = ie_len;
memcpy(pos, &peering_proto, 2);
pos += 2;
- memcpy(pos, &llid, 2);
+ put_unaligned_le16(llid, pos);
pos += 2;
if (include_plid) {
- memcpy(pos, &plid, 2);
+ put_unaligned_le16(plid, pos);
pos += 2;
}
if (action == WLAN_SP_MESH_PEERING_CLOSE) {
- memcpy(pos, &reason, 2);
+ put_unaligned_le16(reason, pos);
pos += 2;
}
if (action != WLAN_SP_MESH_PEERING_CLOSE) {
- if (mesh_add_ht_cap_ie(skb, sdata) ||
- mesh_add_ht_oper_ie(skb, sdata))
+ if (mesh_add_ht_cap_ie(sdata, skb) ||
+ mesh_add_ht_oper_ie(sdata, skb))
goto free;
}
- if (mesh_add_vendor_ies(skb, sdata))
+ if (mesh_add_vendor_ies(sdata, skb))
goto free;
ieee80211_tx_skb(sdata, skb);
@@ -323,92 +374,148 @@ free:
return err;
}
-/**
- * mesh_peer_init - initialize new mesh peer and return resulting sta_info
- *
- * @sdata: local meshif
- * @addr: peer's address
- * @elems: IEs from beacon or mesh peering frame
- *
- * call under RCU
- */
-static struct sta_info *mesh_peer_init(struct ieee80211_sub_if_data *sdata,
- u8 *addr,
- struct ieee802_11_elems *elems)
+static void mesh_sta_info_init(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta,
+ struct ieee802_11_elems *elems, bool insert)
{
struct ieee80211_local *local = sdata->local;
enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
struct ieee80211_supported_band *sband;
- u32 rates, basic_rates = 0;
- struct sta_info *sta;
- bool insert = false;
+ u32 rates, basic_rates = 0, changed = 0;
sband = local->hw.wiphy->bands[band];
- rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates);
-
- sta = sta_info_get(sdata, addr);
- if (!sta) {
- /* Userspace handles peer allocation when security is enabled */
- if (sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED) {
- cfg80211_notify_new_peer_candidate(sdata->dev, addr,
- elems->ie_start,
- elems->total_len,
- GFP_ATOMIC);
- return NULL;
- }
-
- sta = mesh_plink_alloc(sdata, addr);
- if (!sta)
- return NULL;
- insert = true;
- }
+ rates = ieee80211_sta_get_rates(sdata, elems, band, &basic_rates);
spin_lock_bh(&sta->lock);
sta->last_rx = jiffies;
- if (sta->plink_state == NL80211_PLINK_ESTAB) {
- spin_unlock_bh(&sta->lock);
- return sta;
- }
+ /* rates and capabilities don't change during peering */
+ if (sta->plink_state == NL80211_PLINK_ESTAB)
+ goto out;
+
+ if (sta->sta.supp_rates[band] != rates)
+ changed |= IEEE80211_RC_SUPP_RATES_CHANGED;
sta->sta.supp_rates[band] = rates;
- if (elems->ht_cap_elem &&
- sdata->vif.bss_conf.chandef.width != NL80211_CHAN_WIDTH_20_NOHT)
- ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
- elems->ht_cap_elem,
- &sta->sta.ht_cap);
- else
- memset(&sta->sta.ht_cap, 0, sizeof(sta->sta.ht_cap));
-
- if (elems->ht_operation) {
- struct cfg80211_chan_def chandef;
-
- if (!(elems->ht_operation->ht_param &
- IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
- sta->sta.ht_cap.cap &=
- ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
- ieee80211_ht_oper_to_chandef(sdata->vif.bss_conf.chandef.chan,
- elems->ht_operation, &chandef);
- sta->ch_width = chandef.width;
+
+ if (ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
+ elems->ht_cap_elem, sta))
+ changed |= IEEE80211_RC_BW_CHANGED;
+
+ /* HT peer is operating 20MHz-only */
+ if (elems->ht_operation &&
+ !(elems->ht_operation->ht_param &
+ IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
+ if (sta->sta.bandwidth != IEEE80211_STA_RX_BW_20)
+ changed |= IEEE80211_RC_BW_CHANGED;
+ sta->sta.bandwidth = IEEE80211_STA_RX_BW_20;
}
if (insert)
rate_control_rate_init(sta);
+ else
+ rate_control_rate_update(local, sband, sta, changed);
+out:
spin_unlock_bh(&sta->lock);
+}
- if (insert && sta_info_insert(sta))
+static struct sta_info *
+__mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *hw_addr)
+{
+ struct sta_info *sta;
+
+ if (sdata->local->num_sta >= MESH_MAX_PLINKS)
return NULL;
+ sta = sta_info_alloc(sdata, hw_addr, GFP_KERNEL);
+ if (!sta)
+ return NULL;
+
+ sta->plink_state = NL80211_PLINK_LISTEN;
+
+ sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
+ sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
+ sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
+
+ set_sta_flag(sta, WLAN_STA_WME);
+ sta->sta.wme = true;
+
+ return sta;
+}
+
+static struct sta_info *
+mesh_sta_info_alloc(struct ieee80211_sub_if_data *sdata, u8 *addr,
+ struct ieee802_11_elems *elems)
+{
+ struct sta_info *sta = NULL;
+
+ /* Userspace handles station allocation */
+ if (sdata->u.mesh.user_mpm ||
+ sdata->u.mesh.security & IEEE80211_MESH_SEC_AUTHED)
+ cfg80211_notify_new_peer_candidate(sdata->dev, addr,
+ elems->ie_start,
+ elems->total_len,
+ GFP_KERNEL);
+ else
+ sta = __mesh_sta_info_alloc(sdata, addr);
+
+ return sta;
+}
+
+/*
+ * mesh_sta_info_get - return mesh sta info entry for @addr.
+ *
+ * @sdata: local meshif
+ * @addr: peer's address
+ * @elems: IEs from beacon or mesh peering frame.
+ *
+ * Return existing or newly allocated sta_info under RCU read lock.
+ * (re)initialize with given IEs.
+ */
+static struct sta_info *
+mesh_sta_info_get(struct ieee80211_sub_if_data *sdata,
+ u8 *addr, struct ieee802_11_elems *elems) __acquires(RCU)
+{
+ struct sta_info *sta = NULL;
+
+ rcu_read_lock();
+ sta = sta_info_get(sdata, addr);
+ if (sta) {
+ mesh_sta_info_init(sdata, sta, elems, false);
+ } else {
+ rcu_read_unlock();
+ /* can't run atomic */
+ sta = mesh_sta_info_alloc(sdata, addr, elems);
+ if (!sta) {
+ rcu_read_lock();
+ return NULL;
+ }
+
+ mesh_sta_info_init(sdata, sta, elems, true);
+
+ if (sta_info_insert_rcu(sta))
+ return NULL;
+ }
+
return sta;
}
+/*
+ * mesh_neighbour_update - update or initialize new mesh neighbor.
+ *
+ * @sdata: local meshif
+ * @addr: peer's address
+ * @elems: IEs from beacon or mesh peering frame
+ *
+ * Initiates peering if appropriate.
+ */
void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
u8 *hw_addr,
struct ieee802_11_elems *elems)
{
struct sta_info *sta;
+ u32 changed = 0;
- rcu_read_lock();
- sta = mesh_peer_init(sdata, hw_addr, elems);
+ sta = mesh_sta_info_get(sdata, hw_addr, elems);
if (!sta)
goto out;
@@ -416,19 +523,22 @@ void mesh_neighbour_update(struct ieee80211_sub_if_data *sdata,
sta->plink_state == NL80211_PLINK_LISTEN &&
sdata->u.mesh.accepting_plinks &&
sdata->u.mesh.mshcfg.auto_open_plinks &&
- rssi_threshold_check(sta, sdata))
- mesh_plink_open(sta);
+ rssi_threshold_check(sdata, sta))
+ changed = mesh_plink_open(sta);
+ ieee80211_mps_frame_release(sta, elems);
out:
rcu_read_unlock();
+ ieee80211_mbss_info_change_notify(sdata, changed);
}
static void mesh_plink_timer(unsigned long data)
{
struct sta_info *sta;
- __le16 llid, plid, reason;
+ u16 reason = 0;
struct ieee80211_sub_if_data *sdata;
struct mesh_config *mshcfg;
+ enum ieee80211_self_protected_actioncode action = 0;
/*
* This STA is valid because sta_info_destroy() will
@@ -437,10 +547,8 @@ static void mesh_plink_timer(unsigned long data)
*/
sta = (struct sta_info *) data;
- if (sta->sdata->local->quiescing) {
- sta->plink_timer_was_running = true;
+ if (sta->sdata->local->quiescing)
return;
- }
spin_lock_bh(&sta->lock);
if (sta->ignore_plink_timer) {
@@ -449,11 +557,8 @@ static void mesh_plink_timer(unsigned long data)
return;
}
mpl_dbg(sta->sdata,
- "Mesh plink timer for %pM fired on state %d\n",
- sta->sta.addr, sta->plink_state);
- reason = 0;
- llid = sta->llid;
- plid = sta->plid;
+ "Mesh plink timer for %pM fired on state %s\n",
+ sta->sta.addr, mplstates[sta->plink_state]);
sdata = sta->sdata;
mshcfg = &sdata->u.mesh.mshcfg;
@@ -472,75 +577,88 @@ static void mesh_plink_timer(unsigned long data)
rand % sta->plink_timeout;
++sta->plink_retries;
mod_plink_timer(sta, sta->plink_timeout);
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
- sta->sta.addr, llid, 0, 0);
+ action = WLAN_SP_MESH_PEERING_OPEN;
break;
}
- reason = cpu_to_le16(WLAN_REASON_MESH_MAX_RETRIES);
+ reason = WLAN_REASON_MESH_MAX_RETRIES;
/* fall through on else */
case NL80211_PLINK_CNF_RCVD:
/* confirm timer */
if (!reason)
- reason = cpu_to_le16(WLAN_REASON_MESH_CONFIRM_TIMEOUT);
+ reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
sta->plink_state = NL80211_PLINK_HOLDING;
mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
- sta->sta.addr, llid, plid, reason);
+ action = WLAN_SP_MESH_PEERING_CLOSE;
break;
case NL80211_PLINK_HOLDING:
/* holding timer */
del_timer(&sta->plink_timer);
mesh_plink_fsm_restart(sta);
- spin_unlock_bh(&sta->lock);
break;
default:
- spin_unlock_bh(&sta->lock);
break;
}
+ spin_unlock_bh(&sta->lock);
+ if (action)
+ mesh_plink_frame_tx(sdata, action, sta->sta.addr,
+ sta->llid, sta->plid, reason);
}
-#ifdef CONFIG_PM
-void mesh_plink_quiesce(struct sta_info *sta)
+static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
{
- if (del_timer_sync(&sta->plink_timer))
- sta->plink_timer_was_running = true;
+ sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
+ sta->plink_timer.data = (unsigned long) sta;
+ sta->plink_timer.function = mesh_plink_timer;
+ sta->plink_timeout = timeout;
+ add_timer(&sta->plink_timer);
}
-void mesh_plink_restart(struct sta_info *sta)
+static bool llid_in_use(struct ieee80211_sub_if_data *sdata,
+ u16 llid)
{
- if (sta->plink_timer_was_running) {
- add_timer(&sta->plink_timer);
- sta->plink_timer_was_running = false;
+ struct ieee80211_local *local = sdata->local;
+ bool in_use = false;
+ struct sta_info *sta;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(sta, &local->sta_list, list) {
+ if (!memcmp(&sta->llid, &llid, sizeof(llid))) {
+ in_use = true;
+ break;
+ }
}
+ rcu_read_unlock();
+
+ return in_use;
}
-#endif
-static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout)
+static u16 mesh_get_new_llid(struct ieee80211_sub_if_data *sdata)
{
- sta->plink_timer.expires = jiffies + (HZ * timeout / 1000);
- sta->plink_timer.data = (unsigned long) sta;
- sta->plink_timer.function = mesh_plink_timer;
- sta->plink_timeout = timeout;
- add_timer(&sta->plink_timer);
+ u16 llid;
+
+ do {
+ get_random_bytes(&llid, sizeof(llid));
+ /* for mesh PS we still only have the AID range for TIM bits */
+ llid = (llid % IEEE80211_MAX_AID) + 1;
+ } while (llid_in_use(sdata, llid));
+
+ return llid;
}
-int mesh_plink_open(struct sta_info *sta)
+u32 mesh_plink_open(struct sta_info *sta)
{
- __le16 llid;
struct ieee80211_sub_if_data *sdata = sta->sdata;
+ u32 changed;
if (!test_sta_flag(sta, WLAN_STA_AUTH))
- return -EPERM;
+ return 0;
spin_lock_bh(&sta->lock);
- get_random_bytes(&llid, 2);
- sta->llid = llid;
+ sta->llid = mesh_get_new_llid(sdata);
if (sta->plink_state != NL80211_PLINK_LISTEN &&
sta->plink_state != NL80211_PLINK_BLOCKED) {
spin_unlock_bh(&sta->lock);
- return -EBUSY;
+ return 0;
}
sta->plink_state = NL80211_PLINK_OPN_SNT;
mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout);
@@ -549,13 +667,16 @@ int mesh_plink_open(struct sta_info *sta)
"Mesh plink: starting establishment with %pM\n",
sta->sta.addr);
- return mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
- sta->sta.addr, llid, 0, 0);
+ /* set the non-peer mode to active during peering */
+ changed = ieee80211_mps_local_status_update(sdata);
+
+ mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_OPEN,
+ sta->sta.addr, sta->llid, 0, 0);
+ return changed;
}
-void mesh_plink_block(struct sta_info *sta)
+u32 mesh_plink_block(struct sta_info *sta)
{
- struct ieee80211_sub_if_data *sdata = sta->sdata;
u32 changed;
spin_lock_bh(&sta->lock);
@@ -563,383 +684,150 @@ void mesh_plink_block(struct sta_info *sta)
sta->plink_state = NL80211_PLINK_BLOCKED;
spin_unlock_bh(&sta->lock);
- ieee80211_bss_info_change_notify(sdata, changed);
+ return changed;
}
-
-void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt,
- size_t len, struct ieee80211_rx_status *rx_status)
+static void mesh_plink_close(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta,
+ enum plink_event event)
{
struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
- struct ieee802_11_elems elems;
- struct sta_info *sta;
- enum plink_event event;
- enum ieee80211_self_protected_actioncode ftype;
- size_t baselen;
- bool matches_local = true;
- u8 ie_len;
- u8 *baseaddr;
- u32 changed = 0;
- __le16 plid, llid, reason;
- static const char *mplstates[] = {
- [NL80211_PLINK_LISTEN] = "LISTEN",
- [NL80211_PLINK_OPN_SNT] = "OPN-SNT",
- [NL80211_PLINK_OPN_RCVD] = "OPN-RCVD",
- [NL80211_PLINK_CNF_RCVD] = "CNF_RCVD",
- [NL80211_PLINK_ESTAB] = "ESTAB",
- [NL80211_PLINK_HOLDING] = "HOLDING",
- [NL80211_PLINK_BLOCKED] = "BLOCKED"
- };
-
- /* need action_code, aux */
- if (len < IEEE80211_MIN_ACTION_SIZE + 3)
- return;
-
- if (is_multicast_ether_addr(mgmt->da)) {
- mpl_dbg(sdata,
- "Mesh plink: ignore frame from multicast address\n");
- return;
- }
-
- baseaddr = mgmt->u.action.u.self_prot.variable;
- baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
- if (mgmt->u.action.u.self_prot.action_code ==
- WLAN_SP_MESH_PEERING_CONFIRM) {
- baseaddr += 4;
- baselen += 4;
- }
- ieee802_11_parse_elems(baseaddr, len - baselen, &elems);
- if (!elems.peering) {
- mpl_dbg(sdata,
- "Mesh plink: missing necessary peer link ie\n");
- return;
- }
- if (elems.rsn_len &&
- sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
- mpl_dbg(sdata,
- "Mesh plink: can't establish link with secure peer\n");
- return;
- }
-
- ftype = mgmt->u.action.u.self_prot.action_code;
- ie_len = elems.peering_len;
- if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
- (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
- (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
- && ie_len != 8)) {
- mpl_dbg(sdata,
- "Mesh plink: incorrect plink ie length %d %d\n",
- ftype, ie_len);
- return;
- }
-
- if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
- (!elems.mesh_id || !elems.mesh_config)) {
- mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
- return;
- }
- /* Note the lines below are correct, the llid in the frame is the plid
- * from the point of view of this host.
- */
- memcpy(&plid, PLINK_GET_LLID(elems.peering), 2);
- if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
- (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8))
- memcpy(&llid, PLINK_GET_PLID(elems.peering), 2);
-
- rcu_read_lock();
-
- sta = sta_info_get(sdata, mgmt->sa);
- if (!sta && ftype != WLAN_SP_MESH_PEERING_OPEN) {
- mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
- rcu_read_unlock();
- return;
- }
- if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
- !rssi_threshold_check(sta, sdata)) {
- mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
- mgmt->sa);
- rcu_read_unlock();
- return;
- }
+ u16 reason = (event == CLS_ACPT) ?
+ WLAN_REASON_MESH_CLOSE : WLAN_REASON_MESH_CONFIG;
- if (sta && !test_sta_flag(sta, WLAN_STA_AUTH)) {
- mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
- rcu_read_unlock();
- return;
- }
+ sta->reason = reason;
+ sta->plink_state = NL80211_PLINK_HOLDING;
+ mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
+}
- if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) {
- rcu_read_unlock();
- return;
- }
+static u32 mesh_plink_establish(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta)
+{
+ struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
+ u32 changed = 0;
- /* Now we will figure out the appropriate event... */
- event = PLINK_UNDEFINED;
- if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
- !mesh_matches_local(sdata, &elems)) {
- matches_local = false;
- switch (ftype) {
- case WLAN_SP_MESH_PEERING_OPEN:
- event = OPN_RJCT;
- break;
- case WLAN_SP_MESH_PEERING_CONFIRM:
- event = CNF_RJCT;
- break;
- default:
- break;
- }
- }
+ del_timer(&sta->plink_timer);
+ sta->plink_state = NL80211_PLINK_ESTAB;
+ changed |= mesh_plink_inc_estab_count(sdata);
+ changed |= mesh_set_ht_prot_mode(sdata);
+ changed |= mesh_set_short_slot_time(sdata);
+ mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n", sta->sta.addr);
+ ieee80211_mps_sta_status_update(sta);
+ changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode);
+ return changed;
+}
- if (!sta && !matches_local) {
- rcu_read_unlock();
- reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
- llid = 0;
- mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
- mgmt->sa, llid, plid, reason);
- return;
- } else if (!sta) {
- /* ftype == WLAN_SP_MESH_PEERING_OPEN */
- if (!mesh_plink_free_count(sdata)) {
- mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
- rcu_read_unlock();
- return;
- }
- event = OPN_ACPT;
- } else if (matches_local) {
- switch (ftype) {
- case WLAN_SP_MESH_PEERING_OPEN:
- if (!mesh_plink_free_count(sdata) ||
- (sta->plid && sta->plid != plid))
- event = OPN_IGNR;
- else
- event = OPN_ACPT;
- break;
- case WLAN_SP_MESH_PEERING_CONFIRM:
- if (!mesh_plink_free_count(sdata) ||
- (sta->llid != llid || sta->plid != plid))
- event = CNF_IGNR;
- else
- event = CNF_ACPT;
- break;
- case WLAN_SP_MESH_PEERING_CLOSE:
- if (sta->plink_state == NL80211_PLINK_ESTAB)
- /* Do not check for llid or plid. This does not
- * follow the standard but since multiple plinks
- * per sta are not supported, it is necessary in
- * order to avoid a livelock when MP A sees an
- * establish peer link to MP B but MP B does not
- * see it. This can be caused by a timeout in
- * B's peer link establishment or B beign
- * restarted.
- */
- event = CLS_ACPT;
- else if (sta->plid != plid)
- event = CLS_IGNR;
- else if (ie_len == 7 && sta->llid != llid)
- event = CLS_IGNR;
- else
- event = CLS_ACPT;
- break;
- default:
- mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
- rcu_read_unlock();
- return;
- }
- }
+/**
+ * mesh_plink_fsm - step @sta MPM based on @event
+ *
+ * @sdata: interface
+ * @sta: mesh neighbor
+ * @event: peering event
+ *
+ * Return: changed MBSS flags
+ */
+static u32 mesh_plink_fsm(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta, enum plink_event event)
+{
+ struct mesh_config *mshcfg = &sdata->u.mesh.mshcfg;
+ enum ieee80211_self_protected_actioncode action = 0;
+ u32 changed = 0;
- if (event == OPN_ACPT) {
- /* allocate sta entry if necessary and update info */
- sta = mesh_peer_init(sdata, mgmt->sa, &elems);
- if (!sta) {
- mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
- rcu_read_unlock();
- return;
- }
- }
+ mpl_dbg(sdata, "peer %pM in state %s got event %s\n", sta->sta.addr,
+ mplstates[sta->plink_state], mplevents[event]);
- mpl_dbg(sdata,
- "Mesh plink (peer, state, llid, plid, event): %pM %s %d %d %d\n",
- mgmt->sa, mplstates[sta->plink_state],
- le16_to_cpu(sta->llid), le16_to_cpu(sta->plid),
- event);
- reason = 0;
spin_lock_bh(&sta->lock);
switch (sta->plink_state) {
- /* spin_unlock as soon as state is updated at each case */
case NL80211_PLINK_LISTEN:
switch (event) {
case CLS_ACPT:
mesh_plink_fsm_restart(sta);
- spin_unlock_bh(&sta->lock);
break;
case OPN_ACPT:
sta->plink_state = NL80211_PLINK_OPN_RCVD;
- sta->plid = plid;
- get_random_bytes(&llid, 2);
- sta->llid = llid;
+ sta->llid = mesh_get_new_llid(sdata);
mesh_plink_timer_set(sta,
mshcfg->dot11MeshRetryTimeout);
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata,
- WLAN_SP_MESH_PEERING_OPEN,
- sta->sta.addr, llid, 0, 0);
- mesh_plink_frame_tx(sdata,
- WLAN_SP_MESH_PEERING_CONFIRM,
- sta->sta.addr, llid, plid, 0);
+
+ /* set the non-peer mode to active during peering */
+ changed |= ieee80211_mps_local_status_update(sdata);
+ action = WLAN_SP_MESH_PEERING_OPEN;
break;
default:
- spin_unlock_bh(&sta->lock);
break;
}
break;
-
case NL80211_PLINK_OPN_SNT:
switch (event) {
case OPN_RJCT:
case CNF_RJCT:
- reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
case CLS_ACPT:
- if (!reason)
- reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
- sta->reason = reason;
- sta->plink_state = NL80211_PLINK_HOLDING;
- if (!mod_plink_timer(sta,
- mshcfg->dot11MeshHoldingTimeout))
- sta->ignore_plink_timer = true;
-
- llid = sta->llid;
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata,
- WLAN_SP_MESH_PEERING_CLOSE,
- sta->sta.addr, llid, plid, reason);
+ mesh_plink_close(sdata, sta, event);
+ action = WLAN_SP_MESH_PEERING_CLOSE;
break;
case OPN_ACPT:
/* retry timer is left untouched */
sta->plink_state = NL80211_PLINK_OPN_RCVD;
- sta->plid = plid;
- llid = sta->llid;
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata,
- WLAN_SP_MESH_PEERING_CONFIRM,
- sta->sta.addr, llid, plid, 0);
+ action = WLAN_SP_MESH_PEERING_CONFIRM;
break;
case CNF_ACPT:
sta->plink_state = NL80211_PLINK_CNF_RCVD;
if (!mod_plink_timer(sta,
mshcfg->dot11MeshConfirmTimeout))
sta->ignore_plink_timer = true;
-
- spin_unlock_bh(&sta->lock);
break;
default:
- spin_unlock_bh(&sta->lock);
break;
}
break;
-
case NL80211_PLINK_OPN_RCVD:
switch (event) {
case OPN_RJCT:
case CNF_RJCT:
- reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
case CLS_ACPT:
- if (!reason)
- reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
- sta->reason = reason;
- sta->plink_state = NL80211_PLINK_HOLDING;
- if (!mod_plink_timer(sta,
- mshcfg->dot11MeshHoldingTimeout))
- sta->ignore_plink_timer = true;
-
- llid = sta->llid;
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
- sta->sta.addr, llid, plid, reason);
+ mesh_plink_close(sdata, sta, event);
+ action = WLAN_SP_MESH_PEERING_CLOSE;
break;
case OPN_ACPT:
- llid = sta->llid;
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata,
- WLAN_SP_MESH_PEERING_CONFIRM,
- sta->sta.addr, llid, plid, 0);
+ action = WLAN_SP_MESH_PEERING_CONFIRM;
break;
case CNF_ACPT:
- del_timer(&sta->plink_timer);
- sta->plink_state = NL80211_PLINK_ESTAB;
- spin_unlock_bh(&sta->lock);
- changed |= mesh_plink_inc_estab_count(sdata);
- changed |= mesh_set_ht_prot_mode(sdata);
- mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n",
- sta->sta.addr);
+ changed |= mesh_plink_establish(sdata, sta);
break;
default:
- spin_unlock_bh(&sta->lock);
break;
}
break;
-
case NL80211_PLINK_CNF_RCVD:
switch (event) {
case OPN_RJCT:
case CNF_RJCT:
- reason = cpu_to_le16(WLAN_REASON_MESH_CONFIG);
case CLS_ACPT:
- if (!reason)
- reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
- sta->reason = reason;
- sta->plink_state = NL80211_PLINK_HOLDING;
- if (!mod_plink_timer(sta,
- mshcfg->dot11MeshHoldingTimeout))
- sta->ignore_plink_timer = true;
-
- llid = sta->llid;
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata,
- WLAN_SP_MESH_PEERING_CLOSE,
- sta->sta.addr, llid, plid, reason);
+ mesh_plink_close(sdata, sta, event);
+ action = WLAN_SP_MESH_PEERING_CLOSE;
break;
case OPN_ACPT:
- del_timer(&sta->plink_timer);
- sta->plink_state = NL80211_PLINK_ESTAB;
- spin_unlock_bh(&sta->lock);
- changed |= mesh_plink_inc_estab_count(sdata);
- changed |= mesh_set_ht_prot_mode(sdata);
- mpl_dbg(sdata, "Mesh plink with %pM ESTABLISHED\n",
- sta->sta.addr);
- mesh_plink_frame_tx(sdata,
- WLAN_SP_MESH_PEERING_CONFIRM,
- sta->sta.addr, llid, plid, 0);
+ changed |= mesh_plink_establish(sdata, sta);
+ action = WLAN_SP_MESH_PEERING_CONFIRM;
break;
default:
- spin_unlock_bh(&sta->lock);
break;
}
break;
-
case NL80211_PLINK_ESTAB:
switch (event) {
case CLS_ACPT:
- reason = cpu_to_le16(WLAN_REASON_MESH_CLOSE);
- sta->reason = reason;
changed |= __mesh_plink_deactivate(sta);
- sta->plink_state = NL80211_PLINK_HOLDING;
- llid = sta->llid;
- mod_plink_timer(sta, mshcfg->dot11MeshHoldingTimeout);
- spin_unlock_bh(&sta->lock);
changed |= mesh_set_ht_prot_mode(sdata);
- mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
- sta->sta.addr, llid, plid, reason);
+ changed |= mesh_set_short_slot_time(sdata);
+ mesh_plink_close(sdata, sta, event);
+ action = WLAN_SP_MESH_PEERING_CLOSE;
break;
case OPN_ACPT:
- llid = sta->llid;
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata,
- WLAN_SP_MESH_PEERING_CONFIRM,
- sta->sta.addr, llid, plid, 0);
+ action = WLAN_SP_MESH_PEERING_CONFIRM;
break;
default:
- spin_unlock_bh(&sta->lock);
break;
}
break;
@@ -949,32 +837,271 @@ void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata, struct ieee80211_m
if (del_timer(&sta->plink_timer))
sta->ignore_plink_timer = 1;
mesh_plink_fsm_restart(sta);
- spin_unlock_bh(&sta->lock);
break;
case OPN_ACPT:
case CNF_ACPT:
case OPN_RJCT:
case CNF_RJCT:
- llid = sta->llid;
- reason = sta->reason;
- spin_unlock_bh(&sta->lock);
- mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
- sta->sta.addr, llid, plid, reason);
+ action = WLAN_SP_MESH_PEERING_CLOSE;
break;
default:
- spin_unlock_bh(&sta->lock);
+ break;
}
break;
default:
/* should not get here, PLINK_BLOCKED is dealt with at the
* beginning of the function
*/
- spin_unlock_bh(&sta->lock);
break;
}
+ spin_unlock_bh(&sta->lock);
+ if (action) {
+ mesh_plink_frame_tx(sdata, action, sta->sta.addr,
+ sta->llid, sta->plid, sta->reason);
+
+ /* also send confirm in open case */
+ if (action == WLAN_SP_MESH_PEERING_OPEN) {
+ mesh_plink_frame_tx(sdata,
+ WLAN_SP_MESH_PEERING_CONFIRM,
+ sta->sta.addr, sta->llid,
+ sta->plid, 0);
+ }
+ }
+
+ return changed;
+}
+
+/*
+ * mesh_plink_get_event - get correct MPM event
+ *
+ * @sdata: interface
+ * @sta: peer, leave NULL if processing a frame from a new suitable peer
+ * @elems: peering management IEs
+ * @ftype: frame type
+ * @llid: peer's peer link ID
+ * @plid: peer's local link ID
+ *
+ * Return: new peering event for @sta, but PLINK_UNDEFINED should be treated as
+ * an error.
+ */
+static enum plink_event
+mesh_plink_get_event(struct ieee80211_sub_if_data *sdata,
+ struct sta_info *sta,
+ struct ieee802_11_elems *elems,
+ enum ieee80211_self_protected_actioncode ftype,
+ u16 llid, u16 plid)
+{
+ enum plink_event event = PLINK_UNDEFINED;
+ u8 ie_len = elems->peering_len;
+ bool matches_local;
+
+ matches_local = (ftype == WLAN_SP_MESH_PEERING_CLOSE ||
+ mesh_matches_local(sdata, elems));
+
+ /* deny open request from non-matching peer */
+ if (!matches_local && !sta) {
+ event = OPN_RJCT;
+ goto out;
+ }
+
+ if (!sta) {
+ if (ftype != WLAN_SP_MESH_PEERING_OPEN) {
+ mpl_dbg(sdata, "Mesh plink: cls or cnf from unknown peer\n");
+ goto out;
+ }
+ /* ftype == WLAN_SP_MESH_PEERING_OPEN */
+ if (!mesh_plink_free_count(sdata)) {
+ mpl_dbg(sdata, "Mesh plink error: no more free plinks\n");
+ goto out;
+ }
+ } else {
+ if (!test_sta_flag(sta, WLAN_STA_AUTH)) {
+ mpl_dbg(sdata, "Mesh plink: Action frame from non-authed peer\n");
+ goto out;
+ }
+ if (sta->plink_state == NL80211_PLINK_BLOCKED)
+ goto out;
+ }
+
+ /* new matching peer */
+ if (!sta) {
+ event = OPN_ACPT;
+ goto out;
+ }
+
+ switch (ftype) {
+ case WLAN_SP_MESH_PEERING_OPEN:
+ if (!matches_local)
+ event = OPN_RJCT;
+ if (!mesh_plink_free_count(sdata) ||
+ (sta->plid && sta->plid != plid))
+ event = OPN_IGNR;
+ else
+ event = OPN_ACPT;
+ break;
+ case WLAN_SP_MESH_PEERING_CONFIRM:
+ if (!matches_local)
+ event = CNF_RJCT;
+ if (!mesh_plink_free_count(sdata) ||
+ (sta->llid != llid || sta->plid != plid))
+ event = CNF_IGNR;
+ else
+ event = CNF_ACPT;
+ break;
+ case WLAN_SP_MESH_PEERING_CLOSE:
+ if (sta->plink_state == NL80211_PLINK_ESTAB)
+ /* Do not check for llid or plid. This does not
+ * follow the standard but since multiple plinks
+ * per sta are not supported, it is necessary in
+ * order to avoid a livelock when MP A sees an
+ * establish peer link to MP B but MP B does not
+ * see it. This can be caused by a timeout in
+ * B's peer link establishment or B beign
+ * restarted.
+ */
+ event = CLS_ACPT;
+ else if (sta->plid != plid)
+ event = CLS_IGNR;
+ else if (ie_len == 8 && sta->llid != llid)
+ event = CLS_IGNR;
+ else
+ event = CLS_ACPT;
+ break;
+ default:
+ mpl_dbg(sdata, "Mesh plink: unknown frame subtype\n");
+ break;
+ }
+
+out:
+ return event;
+}
+
+static void
+mesh_process_plink_frame(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ struct ieee802_11_elems *elems)
+{
+
+ struct sta_info *sta;
+ enum plink_event event;
+ enum ieee80211_self_protected_actioncode ftype;
+ u32 changed = 0;
+ u8 ie_len = elems->peering_len;
+ __le16 _plid, _llid;
+ u16 plid, llid = 0;
+
+ if (!elems->peering) {
+ mpl_dbg(sdata,
+ "Mesh plink: missing necessary peer link ie\n");
+ return;
+ }
+
+ if (elems->rsn_len &&
+ sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) {
+ mpl_dbg(sdata,
+ "Mesh plink: can't establish link with secure peer\n");
+ return;
+ }
+
+ ftype = mgmt->u.action.u.self_prot.action_code;
+ if ((ftype == WLAN_SP_MESH_PEERING_OPEN && ie_len != 4) ||
+ (ftype == WLAN_SP_MESH_PEERING_CONFIRM && ie_len != 6) ||
+ (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len != 6
+ && ie_len != 8)) {
+ mpl_dbg(sdata,
+ "Mesh plink: incorrect plink ie length %d %d\n",
+ ftype, ie_len);
+ return;
+ }
+ if (ftype != WLAN_SP_MESH_PEERING_CLOSE &&
+ (!elems->mesh_id || !elems->mesh_config)) {
+ mpl_dbg(sdata, "Mesh plink: missing necessary ie\n");
+ return;
+ }
+ /* Note the lines below are correct, the llid in the frame is the plid
+ * from the point of view of this host.
+ */
+ memcpy(&_plid, PLINK_GET_LLID(elems->peering), sizeof(__le16));
+ plid = le16_to_cpu(_plid);
+ if (ftype == WLAN_SP_MESH_PEERING_CONFIRM ||
+ (ftype == WLAN_SP_MESH_PEERING_CLOSE && ie_len == 8)) {
+ memcpy(&_llid, PLINK_GET_PLID(elems->peering), sizeof(__le16));
+ llid = le16_to_cpu(_llid);
+ }
+
+ /* WARNING: Only for sta pointer, is dropped & re-acquired */
+ rcu_read_lock();
+
+ sta = sta_info_get(sdata, mgmt->sa);
+
+ if (ftype == WLAN_SP_MESH_PEERING_OPEN &&
+ !rssi_threshold_check(sdata, sta)) {
+ mpl_dbg(sdata, "Mesh plink: %pM does not meet rssi threshold\n",
+ mgmt->sa);
+ goto unlock_rcu;
+ }
+
+ /* Now we will figure out the appropriate event... */
+ event = mesh_plink_get_event(sdata, sta, elems, ftype, llid, plid);
+
+ if (event == OPN_ACPT) {
+ rcu_read_unlock();
+ /* allocate sta entry if necessary and update info */
+ sta = mesh_sta_info_get(sdata, mgmt->sa, elems);
+ if (!sta) {
+ mpl_dbg(sdata, "Mesh plink: failed to init peer!\n");
+ goto unlock_rcu;
+ }
+ sta->plid = plid;
+ } else if (!sta && event == OPN_RJCT) {
+ mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE,
+ mgmt->sa, 0, plid,
+ WLAN_REASON_MESH_CONFIG);
+ goto unlock_rcu;
+ } else if (!sta || event == PLINK_UNDEFINED) {
+ /* something went wrong */
+ goto unlock_rcu;
+ }
+
+ changed |= mesh_plink_fsm(sdata, sta, event);
+
+unlock_rcu:
rcu_read_unlock();
if (changed)
- ieee80211_bss_info_change_notify(sdata, changed);
+ ieee80211_mbss_info_change_notify(sdata, changed);
+}
+
+void mesh_rx_plink_frame(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt, size_t len,
+ struct ieee80211_rx_status *rx_status)
+{
+ struct ieee802_11_elems elems;
+ size_t baselen;
+ u8 *baseaddr;
+
+ /* need action_code, aux */
+ if (len < IEEE80211_MIN_ACTION_SIZE + 3)
+ return;
+
+ if (sdata->u.mesh.user_mpm)
+ /* userspace must register for these */
+ return;
+
+ if (is_multicast_ether_addr(mgmt->da)) {
+ mpl_dbg(sdata,
+ "Mesh plink: ignore frame from multicast address\n");
+ return;
+ }
+
+ baseaddr = mgmt->u.action.u.self_prot.variable;
+ baselen = (u8 *) mgmt->u.action.u.self_prot.variable - (u8 *) mgmt;
+ if (mgmt->u.action.u.self_prot.action_code ==
+ WLAN_SP_MESH_PEERING_CONFIRM) {
+ baseaddr += 4;
+ baselen += 4;
+ }
+ ieee802_11_parse_elems(baseaddr, len - baselen, true, &elems);
+ mesh_process_plink_frame(sdata, mgmt, &elems);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 00:56:27 +0000