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 ieee80211_local *local = sdata->local; struct ieee802_11_elems elems; struct sta_info *sta; enum plink_event event; enum ieee80211_self_protected_actioncode ftype; size_t baselen; bool deactivated, matches_local = true; u8 ie_len; u8 *baseaddr; __le16 plid, llid, reason; #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG 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" }; #endif /* */ if (len < IEEE80211_MIN_ACTION_SIZE + 3) return; if (is_multicast_ether_addr(mgmt->da)) { mpl_dbg("Mesh plink: ignore frame from multicast address"); 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("Mesh plink: missing necessary peer link ie\n"); return; } if (elems.rsn_len && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) { mpl_dbg("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("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("Mesh plink: missing necessary ie\n"); return; } /* */ 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("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("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("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; } /* */ event = PLINK_UNDEFINED; if (ftype != WLAN_SP_MESH_PEERING_CLOSE && (!mesh_matches_local(&elems, sdata))) { 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) { /* */ u32 rates; rcu_read_unlock(); if (!mesh_plink_free_count(sdata)) { mpl_dbg("Mesh plink error: no more free plinks\n"); return; } rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); sta = mesh_plink_alloc(sdata, mgmt->sa, rates, &elems); if (!sta) { mpl_dbg("Mesh plink error: plink table full\n"); return; } if (sta_info_insert_rcu(sta)) { rcu_read_unlock(); return; } event = OPN_ACPT; spin_lock_bh(&sta->lock); } else if (matches_local) { spin_lock_bh(&sta->lock); 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) /* */ 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("Mesh plink: unknown frame subtype\n"); spin_unlock_bh(&sta->lock); rcu_read_unlock(); return; } } else { spin_lock_bh(&sta->lock); } mpl_dbg("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; switch (sta->plink_state) { /* */ 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, dot11MeshRetryTimeout(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, dot11MeshHoldingTimeout(sdata))) 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: /* */ 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, dot11MeshConfirmTimeout(sdata))) 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, dot11MeshHoldingTimeout(sdata))) 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); mesh_plink_inc_estab_count(sdata); ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); mpl_dbg("Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); 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, dot11MeshHoldingTimeout(sdata))) 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); mesh_plink_inc_estab_count(sdata); ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); mpl_dbg("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); 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; deactivated = __mesh_plink_deactivate(sta); sta->plink_state = NL80211_PLINK_HOLDING; llid = sta->llid; mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); spin_unlock_bh(&sta->lock); if (deactivated) ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON); 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: /* */ spin_unlock_bh(&sta->lock); break; } rcu_read_unlock(); }
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 ieee80211_local *local = sdata->local; struct ieee802_11_elems elems; struct sta_info *sta; enum plink_event event; enum plink_frame_type ftype; size_t baselen; u8 ie_len; u8 *baseaddr; __le16 plid, llid, reason; #ifdef CONFIG_MAC80211_VERBOSE_MPL_DEBUG static const char *mplstates[] = { [PLINK_LISTEN] = "LISTEN", [PLINK_OPN_SNT] = "OPN-SNT", [PLINK_OPN_RCVD] = "OPN-RCVD", [PLINK_CNF_RCVD] = "CNF_RCVD", [PLINK_ESTAB] = "ESTAB", [PLINK_HOLDING] = "HOLDING", [PLINK_BLOCKED] = "BLOCKED" }; #endif /* need action_code, aux */ if (len < IEEE80211_MIN_ACTION_SIZE + 3) return; if (is_multicast_ether_addr(mgmt->da)) { mpl_dbg("Mesh plink: ignore frame from multicast address"); return; } baseaddr = mgmt->u.action.u.plink_action.variable; baselen = (u8 *) mgmt->u.action.u.plink_action.variable - (u8 *) mgmt; if (mgmt->u.action.u.plink_action.action_code == PLINK_CONFIRM) { baseaddr += 4; baselen += 4; } ieee802_11_parse_elems(baseaddr, len - baselen, &elems); if (!elems.peer_link) { mpl_dbg("Mesh plink: missing necessary peer link ie\n"); return; } ftype = mgmt->u.action.u.plink_action.action_code; ie_len = elems.peer_link_len; if ((ftype == PLINK_OPEN && ie_len != 6) || (ftype == PLINK_CONFIRM && ie_len != 8) || (ftype == PLINK_CLOSE && ie_len != 8 && ie_len != 10)) { mpl_dbg("Mesh plink: incorrect plink ie length %d %d\n", ftype, ie_len); return; } if (ftype != PLINK_CLOSE && (!elems.mesh_id || !elems.mesh_config)) { mpl_dbg("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.peer_link), 2); if (ftype == PLINK_CONFIRM || (ftype == PLINK_CLOSE && ie_len == 10)) memcpy(&llid, PLINK_GET_PLID(elems.peer_link), 2); rcu_read_lock(); sta = sta_info_get(sdata, mgmt->sa); if (!sta && ftype != PLINK_OPEN) { mpl_dbg("Mesh plink: cls or cnf from unknown peer\n"); rcu_read_unlock(); return; } if (sta && sta->plink_state == PLINK_BLOCKED) { rcu_read_unlock(); return; } /* Now we will figure out the appropriate event... */ event = PLINK_UNDEFINED; if (ftype != PLINK_CLOSE && (!mesh_matches_local(&elems, sdata))) { switch (ftype) { case PLINK_OPEN: event = OPN_RJCT; break; case PLINK_CONFIRM: event = CNF_RJCT; break; case PLINK_CLOSE: /* avoid warning */ break; } spin_lock_bh(&sta->lock); } else if (!sta) { /* ftype == PLINK_OPEN */ u32 rates; rcu_read_unlock(); if (!mesh_plink_free_count(sdata)) { mpl_dbg("Mesh plink error: no more free plinks\n"); return; } rates = ieee80211_sta_get_rates(local, &elems, rx_status->band); sta = mesh_plink_alloc(sdata, mgmt->sa, rates); if (!sta) { mpl_dbg("Mesh plink error: plink table full\n"); return; } if (sta_info_insert_rcu(sta)) { rcu_read_unlock(); return; } event = OPN_ACPT; spin_lock_bh(&sta->lock); } else { spin_lock_bh(&sta->lock); switch (ftype) { case PLINK_OPEN: if (!mesh_plink_free_count(sdata) || (sta->plid && sta->plid != plid)) event = OPN_IGNR; else event = OPN_ACPT; break; case PLINK_CONFIRM: if (!mesh_plink_free_count(sdata) || (sta->llid != llid || sta->plid != plid)) event = CNF_IGNR; else event = CNF_ACPT; break; case PLINK_CLOSE: if (sta->plink_state == 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("Mesh plink: unknown frame subtype\n"); spin_unlock_bh(&sta->lock); rcu_read_unlock(); return; } } mpl_dbg("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; switch (sta->plink_state) { /* spin_unlock as soon as state is updated at each case */ case PLINK_LISTEN: switch (event) { case CLS_ACPT: mesh_plink_fsm_restart(sta); spin_unlock_bh(&sta->lock); break; case OPN_ACPT: sta->plink_state = PLINK_OPN_RCVD; sta->plid = plid; get_random_bytes(&llid, 2); sta->llid = llid; mesh_plink_timer_set(sta, dot11MeshRetryTimeout(sdata)); spin_unlock_bh(&sta->lock); mesh_plink_frame_tx(sdata, PLINK_OPEN, sta->sta.addr, llid, 0, 0); mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, plid, 0); break; default: spin_unlock_bh(&sta->lock); break; } break; case PLINK_OPN_SNT: switch (event) { case OPN_RJCT: case CNF_RJCT: reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); case CLS_ACPT: if (!reason) reason = cpu_to_le16(MESH_CLOSE_RCVD); sta->reason = reason; sta->plink_state = PLINK_HOLDING; if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) sta->ignore_plink_timer = true; llid = sta->llid; spin_unlock_bh(&sta->lock); mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid, reason); break; case OPN_ACPT: /* retry timer is left untouched */ sta->plink_state = PLINK_OPN_RCVD; sta->plid = plid; llid = sta->llid; spin_unlock_bh(&sta->lock); mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, plid, 0); break; case CNF_ACPT: sta->plink_state = PLINK_CNF_RCVD; if (!mod_plink_timer(sta, dot11MeshConfirmTimeout(sdata))) sta->ignore_plink_timer = true; spin_unlock_bh(&sta->lock); break; default: spin_unlock_bh(&sta->lock); break; } break; case PLINK_OPN_RCVD: switch (event) { case OPN_RJCT: case CNF_RJCT: reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); case CLS_ACPT: if (!reason) reason = cpu_to_le16(MESH_CLOSE_RCVD); sta->reason = reason; sta->plink_state = PLINK_HOLDING; if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) sta->ignore_plink_timer = true; llid = sta->llid; spin_unlock_bh(&sta->lock); mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid, reason); break; case OPN_ACPT: llid = sta->llid; spin_unlock_bh(&sta->lock); mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, plid, 0); break; case CNF_ACPT: del_timer(&sta->plink_timer); sta->plink_state = PLINK_ESTAB; mesh_plink_inc_estab_count(sdata); spin_unlock_bh(&sta->lock); mpl_dbg("Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); break; default: spin_unlock_bh(&sta->lock); break; } break; case PLINK_CNF_RCVD: switch (event) { case OPN_RJCT: case CNF_RJCT: reason = cpu_to_le16(MESH_CAPABILITY_POLICY_VIOLATION); case CLS_ACPT: if (!reason) reason = cpu_to_le16(MESH_CLOSE_RCVD); sta->reason = reason; sta->plink_state = PLINK_HOLDING; if (!mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata))) sta->ignore_plink_timer = true; llid = sta->llid; spin_unlock_bh(&sta->lock); mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid, reason); break; case OPN_ACPT: del_timer(&sta->plink_timer); sta->plink_state = PLINK_ESTAB; mesh_plink_inc_estab_count(sdata); spin_unlock_bh(&sta->lock); mpl_dbg("Mesh plink with %pM ESTABLISHED\n", sta->sta.addr); mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, plid, 0); break; default: spin_unlock_bh(&sta->lock); break; } break; case PLINK_ESTAB: switch (event) { case CLS_ACPT: reason = cpu_to_le16(MESH_CLOSE_RCVD); sta->reason = reason; __mesh_plink_deactivate(sta); sta->plink_state = PLINK_HOLDING; llid = sta->llid; mod_plink_timer(sta, dot11MeshHoldingTimeout(sdata)); spin_unlock_bh(&sta->lock); mesh_plink_frame_tx(sdata, PLINK_CLOSE, sta->sta.addr, llid, plid, reason); break; case OPN_ACPT: llid = sta->llid; spin_unlock_bh(&sta->lock); mesh_plink_frame_tx(sdata, PLINK_CONFIRM, sta->sta.addr, llid, plid, 0); break; default: spin_unlock_bh(&sta->lock); break; } break; case 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, PLINK_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 * beggining of the function */ spin_unlock_bh(&sta->lock); break; } rcu_read_unlock(); }
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata, struct ieee80211_mgmt *mgmt, size_t len, struct ieee80211_rx_status *rx_status, struct ieee802_11_elems *elems, bool beacon) { struct ieee80211_local *local = sdata->local; int freq; struct cfg80211_bss *cbss; struct ieee80211_bss *bss; struct sta_info *sta; struct ieee80211_channel *channel; u64 beacon_timestamp, rx_timestamp; u32 supp_rates = 0; enum ieee80211_band band = rx_status->band; struct ieee80211_supported_band *sband = local->hw.wiphy->bands[band]; bool rates_updated = false; if (elems->ds_params && elems->ds_params_len == 1) freq = ieee80211_channel_to_frequency(elems->ds_params[0], band); else freq = rx_status->freq; channel = ieee80211_get_channel(local->hw.wiphy, freq); if (!channel || channel->flags & IEEE80211_CHAN_DISABLED) return; if (sdata->vif.type == NL80211_IFTYPE_ADHOC && memcmp(mgmt->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) { rcu_read_lock(); sta = sta_info_get(sdata, mgmt->sa); if (elems->supp_rates) { supp_rates = ieee80211_sta_get_rates(local, elems, band); if (sta) { u32 prev_rates; prev_rates = sta->sta.supp_rates[band]; /* make sure mandatory rates are always added */ sta->sta.supp_rates[band] = supp_rates | ieee80211_mandatory_rates(local, band); if (sta->sta.supp_rates[band] != prev_rates) { #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: updated supp_rates set " "for %pM based on beacon" "/probe_resp (0x%x -> 0x%x)\n", sdata->name, sta->sta.addr, prev_rates, sta->sta.supp_rates[band]); #endif rates_updated = true; } } else { rcu_read_unlock(); sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); } } if (sta && elems->wmm_info) set_sta_flag(sta, WLAN_STA_WME); if (sta && elems->ht_info_elem && elems->ht_cap_elem && sdata->u.ibss.channel_type != NL80211_CHAN_NO_HT) { /* we both use HT */ struct ieee80211_sta_ht_cap sta_ht_cap_new; enum nl80211_channel_type channel_type = ieee80211_ht_info_to_channel_type( elems->ht_info_elem); ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband, elems->ht_cap_elem, &sta_ht_cap_new); /* * fall back to HT20 if we don't use or use * the other extension channel */ if ((channel_type == NL80211_CHAN_HT40MINUS || channel_type == NL80211_CHAN_HT40PLUS) && channel_type != sdata->u.ibss.channel_type) sta_ht_cap_new.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; if (memcmp(&sta->sta.ht_cap, &sta_ht_cap_new, sizeof(sta_ht_cap_new))) { memcpy(&sta->sta.ht_cap, &sta_ht_cap_new, sizeof(sta_ht_cap_new)); rates_updated = true; } } if (sta && rates_updated) rate_control_rate_init(sta); rcu_read_unlock(); } bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems, channel, beacon); if (!bss) return; cbss = container_of((void *)bss, struct cfg80211_bss, priv); /* was just updated in ieee80211_bss_info_update */ beacon_timestamp = cbss->tsf; /* check if we need to merge IBSS */ /* we use a fixed BSSID */ if (sdata->u.ibss.fixed_bssid) goto put_bss; /* not an IBSS */ if (!(cbss->capability & WLAN_CAPABILITY_IBSS)) goto put_bss; /* different channel */ if (cbss->channel != local->oper_channel) goto put_bss; /* different SSID */ if (elems->ssid_len != sdata->u.ibss.ssid_len || memcmp(elems->ssid, sdata->u.ibss.ssid, sdata->u.ibss.ssid_len)) goto put_bss; /* same BSSID */ if (memcmp(cbss->bssid, sdata->u.ibss.bssid, ETH_ALEN) == 0) goto put_bss; if (rx_status->flag & RX_FLAG_MACTIME_MPDU) { /* * For correct IBSS merging we need mactime; since mactime is * defined as the time the first data symbol of the frame hits * the PHY, and the timestamp of the beacon is defined as "the * time that the data symbol containing the first bit of the * timestamp is transmitted to the PHY plus the transmitting * STA's delays through its local PHY from the MAC-PHY * interface to its interface with the WM" (802.11 11.1.2) * - equals the time this bit arrives at the receiver - we have * to take into account the offset between the two. * * E.g. at 1 MBit that means mactime is 192 usec earlier * (=24 bytes * 8 usecs/byte) than the beacon timestamp. */ int rate; if (rx_status->flag & RX_FLAG_HT) rate = 65; /* TODO: HT rates */ else rate = local->hw.wiphy->bands[band]-> bitrates[rx_status->rate_idx].bitrate; rx_timestamp = rx_status->mactime + (24 * 8 * 10 / rate); } else { /* * second best option: get current TSF * (will return -1 if not supported) */ rx_timestamp = drv_get_tsf(local, sdata); } #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "RX beacon SA=%pM BSSID=" "%pM TSF=0x%llx BCN=0x%llx diff=%lld @%lu\n", mgmt->sa, mgmt->bssid, (unsigned long long)rx_timestamp, (unsigned long long)beacon_timestamp, (unsigned long long)(rx_timestamp - beacon_timestamp), jiffies); #endif if (beacon_timestamp > rx_timestamp) { #ifdef CONFIG_MAC80211_IBSS_DEBUG printk(KERN_DEBUG "%s: beacon TSF higher than " "local TSF - IBSS merge with BSSID %pM\n", sdata->name, mgmt->bssid); #endif ieee80211_sta_join_ibss(sdata, bss); supp_rates = ieee80211_sta_get_rates(local, elems, band); ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, supp_rates); rcu_read_unlock(); } put_bss: ieee80211_rx_bss_put(local, bss); }