/* * Copyright (c) 2008, 2009 open80211s Ltd. * Author: Luis Carlos Cobo * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include "ieee80211_i.h" #include "rate.h" #include "mesh.h" #define PLINK_GET_LLID(p) (p + 2) #define PLINK_GET_PLID(p) (p + 4) #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, OPN_RJCT, OPN_IGNR, CNF_ACPT, CNF_RJCT, CNF_IGNR, CLS_ACPT, 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); /** * mesh_plink_fsm_restart - restart a mesh peer link finite state machine * * @sta: mesh peer link to restart * * Locking: this function must be called holding sta->lock */ static inline void mesh_plink_fsm_restart(struct sta_info *sta) { sta->plink_state = NL80211_PLINK_LISTEN; sta->llid = sta->plid = sta->reason = 0; sta->plink_retries = 0; } /* * 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 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 (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; for (i = 0; i < sband->n_bitrates; i++) if (sband->bitrates[i].flags & IEEE80211_RATE_ERP_G) erp_rates |= BIT(i); if (!erp_rates) goto out; rcu_read_lock(); list_for_each_entry_rcu(sta, &local->sta_list, list) { if (sdata != sta->sdata || sta->plink_state != NL80211_PLINK_ESTAB) continue; 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; } /** * mesh_set_ht_prot_mode - set correct HT protection mode * * Section 9.23.3.5 of IEEE 80211-2012 describes the protection rules for HT * mesh STA in a MBSS. Three HT protection modes are supported for now, non-HT * mixed mode, 20MHz-protection and no-protection mode. non-HT mixed mode is * selected if any non-HT peers are present in our MBSS. 20MHz-protection mode * is selected if all peers in our 20/40MHz MBSS support HT and atleast one * HT20 peer is present. Otherwise no-protection mode is selected. */ static u32 mesh_set_ht_prot_mode(struct ieee80211_sub_if_data *sdata) { struct ieee80211_local *local = sdata->local; struct sta_info *sta; u16 ht_opmode; bool non_ht_sta = false, ht20_sta = false; if (sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT) return 0; rcu_read_lock(); list_for_each_entry_rcu(sta, &local->sta_list, list) { if (sdata != sta->sdata || sta->plink_state != NL80211_PLINK_ESTAB) continue; 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; break; } mpl_dbg(sdata, "HT20 sta (%pM) is present\n", sta->sta.addr); ht20_sta = true; } rcu_read_unlock(); if (non_ht_sta) ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED; else if (ht20_sta && sdata->vif.bss_conf.chandef.width > NL80211_CHAN_WIDTH_20) ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_20MHZ; else ht_opmode = IEEE80211_HT_OP_MODE_PROTECTION_NONE; if (sdata->vif.bss_conf.ht_operation_mode == ht_opmode) return 0; 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; } /** * __mesh_plink_deactivate - deactivate mesh peer link * * @sta: mesh peer link to deactivate * * All mesh paths with this peer as next hop will be flushed * Returns beacon changed flag if the beacon content changed. * * Locking: the caller must hold sta->lock */ static u32 __mesh_plink_deactivate(struct sta_info *sta) { struct ieee80211_sub_if_data *sdata = sta->sdata; u32 changed = 0; if (sta->plink_state == NL80211_PLINK_ESTAB) changed = mesh_plink_dec_estab_count(sdata); sta->plink_state = NL80211_PLINK_BLOCKED; mesh_path_flush_by_nexthop(sta); ieee80211_mps_sta_status_update(sta); changed |= ieee80211_mps_local_status_update(sdata); return changed; } /** * mesh_plink_deactivate - deactivate mesh peer link * * @sta: mesh peer link to deactivate * * All mesh paths with this peer as next hop will be flushed */ 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); mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, sta->sta.addr, sta->llid, sta->plid, sta->reason); spin_unlock_bh(&sta->lock); 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) { struct ieee80211_local *local = sdata->local; struct sk_buff *skb; struct ieee80211_tx_info *info; struct ieee80211_mgmt *mgmt; bool include_plid = false; u16 peering_proto = 0; u8 *pos, ie_len = 4; int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.self_prot) + sizeof(mgmt->u.action.u.self_prot); int err = -ENOMEM; skb = dev_alloc_skb(local->tx_headroom + hdr_len + 2 + /* capability info */ 2 + /* AID */ 2 + 8 + /* supported rates */ 2 + (IEEE80211_MAX_SUPP_RATES - 8) + 2 + sdata->u.mesh.mesh_id_len + 2 + sizeof(struct ieee80211_meshconf_ie) + 2 + sizeof(struct ieee80211_ht_cap) + 2 + sizeof(struct ieee80211_ht_operation) + 2 + 8 + /* peering IE */ sdata->u.mesh.ie_len); if (!skb) return -1; info = IEEE80211_SKB_CB(skb); skb_reserve(skb, local->tx_headroom); mgmt = (struct ieee80211_mgmt *) skb_put(skb, hdr_len); memset(mgmt, 0, hdr_len); mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_ACTION); memcpy(mgmt->da, da, ETH_ALEN); memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN); mgmt->u.action.category = WLAN_CATEGORY_SELF_PROTECTED; mgmt->u.action.u.self_prot.action_code = action; if (action != WLAN_SP_MESH_PEERING_CLOSE) { enum ieee80211_band band = ieee80211_get_sdata_band(sdata); /* capability info */ pos = skb_put(skb, 2); memset(pos, 0, 2); if (action == WLAN_SP_MESH_PEERING_CONFIRM) { /* AID */ pos = skb_put(skb, 2); memcpy(pos + 2, &plid, 2); } if (ieee80211_add_srates_ie(sdata, skb, true, band) || ieee80211_add_ext_srates_ie(sdata, skb, true, band) || 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(sdata, skb)) goto free; } /* Add Mesh Peering Management element */ switch (action) { case WLAN_SP_MESH_PEERING_OPEN: break; case WLAN_SP_MESH_PEERING_CONFIRM: ie_len += 2; include_plid = true; break; case WLAN_SP_MESH_PEERING_CLOSE: if (plid) { ie_len += 2; include_plid = true; } ie_len += 2; /* reason code */ break; default: err = -EINVAL; goto free; } if (WARN_ON(skb_tailroom(skb) < 2 + ie_len)) goto free; pos = skb_put(skb, 2 + ie_len); *pos++ = WLAN_EID_PEER_MGMT; *pos++ = ie_len; memcpy(pos, &peering_proto, 2); pos += 2; memcpy(pos, &llid, 2); pos += 2; if (include_plid) { memcpy(pos, &plid, 2); pos += 2; } if (action == WLAN_SP_MESH_PEERING_CLOSE) { memcpy(pos, &reason, 2); pos += 2; } if (action != WLAN_SP_MESH_PEERING_CLOSE) { if (mesh_add_ht_cap_ie(sdata, skb) || mesh_add_ht_oper_ie(sdata, skb)) goto free; } if (mesh_add_vendor_ies(sdata, skb)) goto free; ieee80211_tx_skb(sdata, skb); return 0; free: kfree_skb(skb); return err; } 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, changed = 0; sband = local->hw.wiphy->bands[band]; rates = ieee80211_sta_get_rates(local, elems, band, &basic_rates); spin_lock_bh(&sta->lock); sta->last_rx = jiffies; /* 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 (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); } 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; init_timer(&sta->plink_timer); 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); 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 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_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; sta = mesh_sta_info_get(sdata, hw_addr, elems); if (!sta) goto out; if (mesh_peer_accepts_plinks(elems) && sta->plink_state == NL80211_PLINK_LISTEN && sdata->u.mesh.accepting_plinks && sdata->u.mesh.mshcfg.auto_open_plinks && rssi_threshold_check(sta, sdata)) 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; struct ieee80211_sub_if_data *sdata; struct mesh_config *mshcfg; /* * This STA is valid because sta_info_destroy() will * del_timer_sync() this timer after having made sure * it cannot be readded (by deleting the plink.) */ sta = (struct sta_info *) data; if (sta->sdata->local->quiescing) { sta->plink_timer_was_running = true; return; } spin_lock_bh(&sta->lock); if (sta->ignore_plink_timer) { sta->ignore_plink_timer = false; spin_unlock_bh(&sta->lock); 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; sdata = sta->sdata; mshcfg = &sdata->u.mesh.mshcfg; switch (sta->plink_state) { case NL80211_PLINK_OPN_RCVD: case NL80211_PLINK_OPN_SNT: /* retry timer */ if (sta->plink_retries < mshcfg->dot11MeshMaxRetries) { u32 rand; mpl_dbg(sta->sdata, "Mesh plink for %pM (retry, timeout): %d %d\n", sta->sta.addr, sta->plink_retries, sta->plink_timeout); get_random_bytes(&rand, sizeof(u32)); sta->plink_timeout = sta->plink_timeout + 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); break; } reason = cpu_to_le16(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); 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); 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; } } #ifdef CONFIG_PM void mesh_plink_quiesce(struct sta_info *sta) { if (!ieee80211_vif_is_mesh(&sta->sdata->vif)) return; /* no kernel mesh sta timers have been initialized */ if (sta->sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE) return; if (del_timer_sync(&sta->plink_timer)) sta->plink_timer_was_running = true; } void mesh_plink_restart(struct sta_info *sta) { if (sta->plink_timer_was_running) { add_timer(&sta->plink_timer); sta->plink_timer_was_running = false; } } #endif static inline void mesh_plink_timer_set(struct sta_info *sta, int timeout) { 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); } 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 0; spin_lock_bh(&sta->lock); get_random_bytes(&llid, 2); sta->llid = llid; if (sta->plink_state != NL80211_PLINK_LISTEN && sta->plink_state != NL80211_PLINK_BLOCKED) { spin_unlock_bh(&sta->lock); return 0; } sta->plink_state = NL80211_PLINK_OPN_SNT; mesh_plink_timer_set(sta, sdata->u.mesh.mshcfg.dot11MeshRetryTimeout); spin_unlock_bh(&sta->lock); mpl_dbg(sdata, "Mesh plink: starting establishment with %pM\n", sta->sta.addr); /* 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, llid, 0, 0); return changed; } u32 mesh_plink_block(struct sta_info *sta) { u32 changed; spin_lock_bh(&sta->lock); changed = __mesh_plink_deactivate(sta); sta->plink_state = NL80211_PLINK_BLOCKED; spin_unlock_bh(&sta->lock); 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) { 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; /* 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); /* WARNING: Only for sta pointer, is dropped & re-acquired */ 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; } 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; } if (sta && sta->plink_state == NL80211_PLINK_BLOCKED) { rcu_read_unlock(); return; } /* 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; } } 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; } } 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"); rcu_read_unlock(); return; } } mpl_dbg(sdata, "peer %pM in state %s got event %s\n", mgmt->sa, mplstates[sta->plink_state], mplevents[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; mesh_plink_timer_set(sta, mshcfg->dot11MeshRetryTimeout); /* set the non-peer mode to active during peering */ changed |= ieee80211_mps_local_status_update(sdata); 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); 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); 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); 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); 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); 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); 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); 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); 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); changed |= mesh_set_short_slot_time(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); ieee80211_mps_sta_status_update(sta); changed |= ieee80211_mps_set_sta_local_pm(sta, mshcfg->power_mode); 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); changed |= mesh_set_short_slot_time(sdata); mesh_plink_frame_tx(sdata, WLAN_SP_MESH_PEERING_CLOSE, sta->sta.addr, llid, plid, reason); 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); break; default: spin_unlock_bh(&sta->lock); break; } break; case NL80211_PLINK_HOLDING: switch (event) { case CLS_ACPT: 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); break; default: spin_unlock_bh(&sta->lock); } break; default: /* should not get here, PLINK_BLOCKED is dealt with at the * beginning of the function */ spin_unlock_bh(&sta->lock); break; } rcu_read_unlock(); if (changed) ieee80211_mbss_info_change_notify(sdata, changed); }