/* * Copyright 2002-2005, Instant802 Networks, Inc. * Copyright 2005-2006, Devicescape Software, Inc. * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> * * 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. * * * Transmit and frame generation functions. */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/skbuff.h> #include <linux/etherdevice.h> #include <linux/bitmap.h> #include <linux/rcupdate.h> #include <linux/export.h> #include <net/net_namespace.h> #include <net/ieee80211_radiotap.h> #include <net/cfg80211.h> #include <net/mac80211.h> #include <asm/unaligned.h> #include "ieee80211_i.h" #include "driver-ops.h" #include "led.h" #include "mesh.h" #include "wep.h" #include "wpa.h" #include "wme.h" #include "rate.h" /* misc utils */ static __le16 ieee80211_duration(struct ieee80211_tx_data *tx, struct sk_buff *skb, int group_addr, int next_frag_len) { int rate, mrate, erp, dur, i, shift = 0; struct ieee80211_rate *txrate; struct ieee80211_local *local = tx->local; struct ieee80211_supported_band *sband; struct ieee80211_hdr *hdr; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_chanctx_conf *chanctx_conf; u32 rate_flags = 0; rcu_read_lock(); chanctx_conf = rcu_dereference(tx->sdata->vif.chanctx_conf); if (chanctx_conf) { shift = ieee80211_chandef_get_shift(&chanctx_conf->def); rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def); } rcu_read_unlock(); /* assume HW handles this */ if (tx->rate.flags & IEEE80211_TX_RC_MCS) return 0; /* uh huh? */ if (WARN_ON_ONCE(tx->rate.idx < 0)) return 0; sband = local->hw.wiphy->bands[info->band]; txrate = &sband->bitrates[tx->rate.idx]; erp = txrate->flags & IEEE80211_RATE_ERP_G; /* * data and mgmt (except PS Poll): * - during CFP: 32768 * - during contention period: * if addr1 is group address: 0 * if more fragments = 0 and addr1 is individual address: time to * transmit one ACK plus SIFS * if more fragments = 1 and addr1 is individual address: time to * transmit next fragment plus 2 x ACK plus 3 x SIFS * * IEEE 802.11, 9.6: * - control response frame (CTS or ACK) shall be transmitted using the * same rate as the immediately previous frame in the frame exchange * sequence, if this rate belongs to the PHY mandatory rates, or else * at the highest possible rate belonging to the PHY rates in the * BSSBasicRateSet */ hdr = (struct ieee80211_hdr *)skb->data; if (ieee80211_is_ctl(hdr->frame_control)) { /* TODO: These control frames are not currently sent by * mac80211, but should they be implemented, this function * needs to be updated to support duration field calculation. * * RTS: time needed to transmit pending data/mgmt frame plus * one CTS frame plus one ACK frame plus 3 x SIFS * CTS: duration of immediately previous RTS minus time * required to transmit CTS and its SIFS * ACK: 0 if immediately previous directed data/mgmt had * more=0, with more=1 duration in ACK frame is duration * from previous frame minus time needed to transmit ACK * and its SIFS * PS Poll: BIT(15) | BIT(14) | aid */ return 0; } /* data/mgmt */ if (0 /* FIX: data/mgmt during CFP */) return cpu_to_le16(32768); if (group_addr) /* Group address as the destination - no ACK */ return 0; /* Individual destination address: * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes) * CTS and ACK frames shall be transmitted using the highest rate in * basic rate set that is less than or equal to the rate of the * immediately previous frame and that is using the same modulation * (CCK or OFDM). If no basic rate set matches with these requirements, * the highest mandatory rate of the PHY that is less than or equal to * the rate of the previous frame is used. * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps */ rate = -1; /* use lowest available if everything fails */ mrate = sband->bitrates[0].bitrate; for (i = 0; i < sband->n_bitrates; i++) { struct ieee80211_rate *r = &sband->bitrates[i]; if (r->bitrate > txrate->bitrate) break; if ((rate_flags & r->flags) != rate_flags) continue; if (tx->sdata->vif.bss_conf.basic_rates & BIT(i)) rate = DIV_ROUND_UP(r->bitrate, 1 << shift); switch (sband->band) { case IEEE80211_BAND_2GHZ: { u32 flag; if (tx->sdata->flags & IEEE80211_SDATA_OPERATING_GMODE) flag = IEEE80211_RATE_MANDATORY_G; else flag = IEEE80211_RATE_MANDATORY_B; if (r->flags & flag) mrate = r->bitrate; break; } case IEEE80211_BAND_5GHZ: if (r->flags & IEEE80211_RATE_MANDATORY_A) mrate = r->bitrate; break; case IEEE80211_BAND_60GHZ: /* TODO, for now fall through */ case IEEE80211_NUM_BANDS: WARN_ON(1); break; } } if (rate == -1) { /* No matching basic rate found; use highest suitable mandatory * PHY rate */ rate = DIV_ROUND_UP(mrate, 1 << shift); } /* Don't calculate ACKs for QoS Frames with NoAck Policy set */ if (ieee80211_is_data_qos(hdr->frame_control) && *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK) dur = 0; else /* Time needed to transmit ACK * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up * to closest integer */ dur = ieee80211_frame_duration(sband->band, 10, rate, erp, tx->sdata->vif.bss_conf.use_short_preamble, shift); if (next_frag_len) { /* Frame is fragmented: duration increases with time needed to * transmit next fragment plus ACK and 2 x SIFS. */ dur *= 2; /* ACK + SIFS */ /* next fragment */ dur += ieee80211_frame_duration(sband->band, next_frag_len, txrate->bitrate, erp, tx->sdata->vif.bss_conf.use_short_preamble, shift); } return cpu_to_le16(dur); } /* tx handlers */ static ieee80211_tx_result debug_noinline ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx) { struct ieee80211_local *local = tx->local; struct ieee80211_if_managed *ifmgd; /* driver doesn't support power save */ if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) return TX_CONTINUE; /* hardware does dynamic power save */ if (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) return TX_CONTINUE; /* dynamic power save disabled */ if (local->hw.conf.dynamic_ps_timeout <= 0) return TX_CONTINUE; /* we are scanning, don't enable power save */ if (local->scanning) return TX_CONTINUE; if (!local->ps_sdata) return TX_CONTINUE; /* No point if we're going to suspend */ if (local->quiescing) return TX_CONTINUE; /* dynamic ps is supported only in managed mode */ if (tx->sdata->vif.type != NL80211_IFTYPE_STATION) return TX_CONTINUE; ifmgd = &tx->sdata->u.mgd; /* * Don't wakeup from power save if u-apsd is enabled, voip ac has * u-apsd enabled and the frame is in voip class. This effectively * means that even if all access categories have u-apsd enabled, in * practise u-apsd is only used with the voip ac. This is a * workaround for the case when received voip class packets do not * have correct qos tag for some reason, due the network or the * peer application. * * Note: ifmgd->uapsd_queues access is racy here. If the value is * changed via debugfs, user needs to reassociate manually to have * everything in sync. */ if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) && (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) && skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO) return TX_CONTINUE; if (local->hw.conf.flags & IEEE80211_CONF_PS) { ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP, IEEE80211_QUEUE_STOP_REASON_PS); ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED; ieee80211_queue_work(&local->hw, &local->dynamic_ps_disable_work); } /* Don't restart the timer if we're not disassociated */ if (!ifmgd->associated) return TX_CONTINUE; mod_timer(&local->dynamic_ps_timer, jiffies + msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); return TX_CONTINUE; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); bool assoc = false; if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED)) return TX_CONTINUE; if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) && test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) && !ieee80211_is_probe_req(hdr->frame_control) && !ieee80211_is_nullfunc(hdr->frame_control)) /* * When software scanning only nullfunc frames (to notify * the sleep state to the AP) and probe requests (for the * active scan) are allowed, all other frames should not be * sent and we should not get here, but if we do * nonetheless, drop them to avoid sending them * off-channel. See the link below and * ieee80211_start_scan() for more. * * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089 */ return TX_DROP; if (tx->sdata->vif.type == NL80211_IFTYPE_WDS) return TX_CONTINUE; if (tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT) return TX_CONTINUE; if (tx->flags & IEEE80211_TX_PS_BUFFERED) return TX_CONTINUE; if (tx->sta) assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); if (likely(tx->flags & IEEE80211_TX_UNICAST)) { if (unlikely(!assoc && ieee80211_is_data(hdr->frame_control))) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG sdata_info(tx->sdata, "dropped data frame to not associated station %pM\n", hdr->addr1); #endif I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc); return TX_DROP; } } else if (unlikely(tx->sdata->vif.type == NL80211_IFTYPE_AP && ieee80211_is_data(hdr->frame_control) && !atomic_read(&tx->sdata->u.ap.num_mcast_sta))) { /* * No associated STAs - no need to send multicast * frames. */ return TX_DROP; } return TX_CONTINUE; } /* This function is called whenever the AP is about to exceed the maximum limit * of buffered frames for power saving STAs. This situation should not really * happen often during normal operation, so dropping the oldest buffered packet * from each queue should be OK to make some room for new frames. */ static void purge_old_ps_buffers(struct ieee80211_local *local) { int total = 0, purged = 0; struct sk_buff *skb; struct ieee80211_sub_if_data *sdata; struct sta_info *sta; list_for_each_entry_rcu(sdata, &local->interfaces, list) { struct ps_data *ps; if (sdata->vif.type == NL80211_IFTYPE_AP) ps = &sdata->u.ap.ps; else if (ieee80211_vif_is_mesh(&sdata->vif)) ps = &sdata->u.mesh.ps; else continue; skb = skb_dequeue(&ps->bc_buf); if (skb) { purged++; dev_kfree_skb(skb); } total += skb_queue_len(&ps->bc_buf); } /* * Drop one frame from each station from the lowest-priority * AC that has frames at all. */ list_for_each_entry_rcu(sta, &local->sta_list, list) { int ac; for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) { skb = skb_dequeue(&sta->ps_tx_buf[ac]); total += skb_queue_len(&sta->ps_tx_buf[ac]); if (skb) { purged++; ieee80211_free_txskb(&local->hw, skb); break; } } } local->total_ps_buffered = total; ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged); } static ieee80211_tx_result ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; struct ps_data *ps; /* * broadcast/multicast frame * * If any of the associated/peer stations is in power save mode, * the frame is buffered to be sent after DTIM beacon frame. * This is done either by the hardware or us. */ /* powersaving STAs currently only in AP/VLAN/mesh mode */ if (tx->sdata->vif.type == NL80211_IFTYPE_AP || tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { if (!tx->sdata->bss) return TX_CONTINUE; ps = &tx->sdata->bss->ps; } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) { ps = &tx->sdata->u.mesh.ps; } else { return TX_CONTINUE; } /* no buffering for ordered frames */ if (ieee80211_has_order(hdr->frame_control)) return TX_CONTINUE; if (ieee80211_is_probe_req(hdr->frame_control)) return TX_CONTINUE; if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) info->hw_queue = tx->sdata->vif.cab_queue; /* no stations in PS mode */ if (!atomic_read(&ps->num_sta_ps)) return TX_CONTINUE; info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM; /* device releases frame after DTIM beacon */ if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING)) return TX_CONTINUE; /* buffered in mac80211 */ if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) purge_old_ps_buffers(tx->local); if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) { ps_dbg(tx->sdata, "BC TX buffer full - dropping the oldest frame\n"); dev_kfree_skb(skb_dequeue(&ps->bc_buf)); } else tx->local->total_ps_buffered++; skb_queue_tail(&ps->bc_buf, tx->skb); return TX_QUEUED; } static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta, struct sk_buff *skb) { if (!ieee80211_is_mgmt(fc)) return 0; if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP)) return 0; if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) skb->data)) return 0; return 1; } static ieee80211_tx_result ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx) { struct sta_info *sta = tx->sta; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; struct ieee80211_local *local = tx->local; if (unlikely(!sta)) return TX_CONTINUE; if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) || test_sta_flag(sta, WLAN_STA_PS_DRIVER)) && !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) { int ac = skb_get_queue_mapping(tx->skb); /* only deauth, disassoc and action are bufferable MMPDUs */ if (ieee80211_is_mgmt(hdr->frame_control) && !ieee80211_is_deauth(hdr->frame_control) && !ieee80211_is_disassoc(hdr->frame_control) && !ieee80211_is_action(hdr->frame_control)) { info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; return TX_CONTINUE; } ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n", sta->sta.addr, sta->sta.aid, ac); if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER) purge_old_ps_buffers(tx->local); /* sync with ieee80211_sta_ps_deliver_wakeup */ spin_lock(&sta->ps_lock); /* * STA woke up the meantime and all the frames on ps_tx_buf have * been queued to pending queue. No reordering can happen, go * ahead and Tx the packet. */ if (!test_sta_flag(sta, WLAN_STA_PS_STA) && !test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { spin_unlock(&sta->ps_lock); return TX_CONTINUE; } if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) { struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]); ps_dbg(tx->sdata, "STA %pM TX buffer for AC %d full - dropping oldest frame\n", sta->sta.addr, ac); ieee80211_free_txskb(&local->hw, old); } else tx->local->total_ps_buffered++; info->control.jiffies = jiffies; info->control.vif = &tx->sdata->vif; info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb); spin_unlock(&sta->ps_lock); if (!timer_pending(&local->sta_cleanup)) mod_timer(&local->sta_cleanup, round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); /* * We queued up some frames, so the TIM bit might * need to be set, recalculate it. */ sta_info_recalc_tim(sta); return TX_QUEUED; } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) { ps_dbg(tx->sdata, "STA %pM in PS mode, but polling/in SP -> send frame\n", sta->sta.addr); } return TX_CONTINUE; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx) { if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED)) return TX_CONTINUE; if (tx->flags & IEEE80211_TX_UNICAST) return ieee80211_tx_h_unicast_ps_buf(tx); else return ieee80211_tx_h_multicast_ps_buf(tx); } static ieee80211_tx_result debug_noinline ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) { if (tx->sdata->control_port_no_encrypt) info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO; info->flags |= IEEE80211_TX_CTL_USE_MINRATE; } return TX_CONTINUE; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx) { struct ieee80211_key *key; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) tx->key = NULL; else if (tx->sta && (key = rcu_dereference(tx->sta->ptk))) tx->key = key; else if (ieee80211_is_mgmt(hdr->frame_control) && is_multicast_ether_addr(hdr->addr1) && ieee80211_is_robust_mgmt_frame(hdr) && (key = rcu_dereference(tx->sdata->default_mgmt_key))) tx->key = key; else if (is_multicast_ether_addr(hdr->addr1) && (key = rcu_dereference(tx->sdata->default_multicast_key))) tx->key = key; else if (!is_multicast_ether_addr(hdr->addr1) && (key = rcu_dereference(tx->sdata->default_unicast_key))) tx->key = key; else if (info->flags & IEEE80211_TX_CTL_INJECTED) tx->key = NULL; else if (!tx->sdata->drop_unencrypted) tx->key = NULL; else if (tx->skb->protocol == tx->sdata->control_port_protocol) tx->key = NULL; else if (ieee80211_is_robust_mgmt_frame(hdr) && !(ieee80211_is_action(hdr->frame_control) && tx->sta && test_sta_flag(tx->sta, WLAN_STA_MFP))) tx->key = NULL; else if (ieee80211_is_mgmt(hdr->frame_control) && !ieee80211_is_robust_mgmt_frame(hdr)) tx->key = NULL; else { I802_DEBUG_INC(tx->local->tx_handlers_drop_unencrypted); return TX_DROP; } if (tx->key) { bool skip_hw = false; tx->key->tx_rx_count++; /* TODO: add threshold stuff again */ switch (tx->key->conf.cipher) { case WLAN_CIPHER_SUITE_WEP40: case WLAN_CIPHER_SUITE_WEP104: case WLAN_CIPHER_SUITE_TKIP: if (!ieee80211_is_data_present(hdr->frame_control)) tx->key = NULL; break; case WLAN_CIPHER_SUITE_CCMP: if (!ieee80211_is_data_present(hdr->frame_control) && !ieee80211_use_mfp(hdr->frame_control, tx->sta, tx->skb)) tx->key = NULL; else skip_hw = (tx->key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT_TX) && ieee80211_is_mgmt(hdr->frame_control); break; case WLAN_CIPHER_SUITE_AES_CMAC: if (!ieee80211_is_mgmt(hdr->frame_control)) tx->key = NULL; break; } if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED && !ieee80211_is_deauth(hdr->frame_control))) return TX_DROP; if (!skip_hw && tx->key && tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) info->control.hw_key = &tx->key->conf; } return TX_CONTINUE; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); struct ieee80211_hdr *hdr = (void *)tx->skb->data; struct ieee80211_supported_band *sband; u32 len; struct ieee80211_tx_rate_control txrc; struct ieee80211_sta_rates *ratetbl = NULL; bool assoc = false; memset(&txrc, 0, sizeof(txrc)); sband = tx->local->hw.wiphy->bands[info->band]; len = min_t(u32, tx->skb->len + FCS_LEN, tx->local->hw.wiphy->frag_threshold); /* set up the tx rate control struct we give the RC algo */ txrc.hw = &tx->local->hw; txrc.sband = sband; txrc.bss_conf = &tx->sdata->vif.bss_conf; txrc.skb = tx->skb; txrc.reported_rate.idx = -1; txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band]; if (txrc.rate_idx_mask == (1 << sband->n_bitrates) - 1) txrc.max_rate_idx = -1; else txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; if (tx->sdata->rc_has_mcs_mask[info->band]) txrc.rate_idx_mcs_mask = tx->sdata->rc_rateidx_mcs_mask[info->band]; txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP || tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT || tx->sdata->vif.type == NL80211_IFTYPE_ADHOC); /* set up RTS protection if desired */ if (len > tx->local->hw.wiphy->rts_threshold) { txrc.rts = true; } info->control.use_rts = txrc.rts; info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot; /* * Use short preamble if the BSS can handle it, but not for * management frames unless we know the receiver can handle * that -- the management frame might be to a station that * just wants a probe response. */ if (tx->sdata->vif.bss_conf.use_short_preamble && (ieee80211_is_data(hdr->frame_control) || (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE)))) txrc.short_preamble = true; info->control.short_preamble = txrc.short_preamble; if (tx->sta) assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC); /* * Lets not bother rate control if we're associated and cannot * talk to the sta. This should not happen. */ if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc && !rate_usable_index_exists(sband, &tx->sta->sta), "%s: Dropped data frame as no usable bitrate found while " "scanning and associated. Target station: " "%pM on %d GHz band\n", tx->sdata->name, hdr->addr1, info->band ? 5 : 2)) return TX_DROP; /* * If we're associated with the sta at this point we know we can at * least send the frame at the lowest bit rate. */ rate_control_get_rate(tx->sdata, tx->sta, &txrc); if (tx->sta && !info->control.skip_table) ratetbl = rcu_dereference(tx->sta->sta.rates); if (unlikely(info->control.rates[0].idx < 0)) { if (ratetbl) { struct ieee80211_tx_rate rate = { .idx = ratetbl->rate[0].idx, .flags = ratetbl->rate[0].flags, .count = ratetbl->rate[0].count }; if (ratetbl->rate[0].idx < 0) return TX_DROP; tx->rate = rate; } else { return TX_DROP; } } else { tx->rate = info->control.rates[0]; } if (txrc.reported_rate.idx < 0) { txrc.reported_rate = tx->rate; if (tx->sta && ieee80211_is_data(hdr->frame_control)) tx->sta->last_tx_rate = txrc.reported_rate; } else if (tx->sta) tx->sta->last_tx_rate = txrc.reported_rate; if (ratetbl) return TX_CONTINUE; if (unlikely(!info->control.rates[0].count)) info->control.rates[0].count = 1; if (WARN_ON_ONCE((info->control.rates[0].count > 1) && (info->flags & IEEE80211_TX_CTL_NO_ACK))) info->control.rates[0].count = 1; return TX_CONTINUE; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data; u16 *seq; u8 *qc; int tid; /* * Packet injection may want to control the sequence * number, if we have no matching interface then we * neither assign one ourselves nor ask the driver to. */ if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR)) return TX_CONTINUE; if (unlikely(ieee80211_is_ctl(hdr->frame_control))) return TX_CONTINUE; if (ieee80211_hdrlen(hdr->frame_control) < 24) return TX_CONTINUE; if (ieee80211_is_qos_nullfunc(hdr->frame_control)) return TX_CONTINUE; /* * Anything but QoS data that has a sequence number field * (is long enough) gets a sequence number from the global * counter. QoS data frames with a multicast destination * also use the global counter (802.11-2012 9.3.2.10). */ if (!ieee80211_is_data_qos(hdr->frame_control) || is_multicast_ether_addr(hdr->addr1)) { /* driver should assign sequence number */ info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ; /* for pure STA mode without beacons, we can do it */ hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number); tx->sdata->sequence_number += 0x10; return TX_CONTINUE; } /* * This should be true for injected/management frames only, for * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ * above since they are not QoS-data frames. */ if (!tx->sta) return TX_CONTINUE; /* include per-STA, per-TID sequence counter */ qc = ieee80211_get_qos_ctl(hdr); tid = *qc & IEEE80211_QOS_CTL_TID_MASK; seq = &tx->sta->tid_seq[tid]; hdr->seq_ctrl = cpu_to_le16(*seq); /* Increase the sequence number. */ *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ; return TX_CONTINUE; } static int ieee80211_fragment(struct ieee80211_tx_data *tx, struct sk_buff *skb, int hdrlen, int frag_threshold) { struct ieee80211_local *local = tx->local; struct ieee80211_tx_info *info; struct sk_buff *tmp; int per_fragm = frag_threshold - hdrlen - FCS_LEN; int pos = hdrlen + per_fragm; int rem = skb->len - hdrlen - per_fragm; if (WARN_ON(rem < 0)) return -EINVAL; /* first fragment was already added to queue by caller */ while (rem) { int fraglen = per_fragm; if (fraglen > rem) fraglen = rem; rem -= fraglen; tmp = dev_alloc_skb(local->tx_headroom + frag_threshold + IEEE80211_ENCRYPT_HEADROOM + IEEE80211_ENCRYPT_TAILROOM); if (!tmp) return -ENOMEM; __skb_queue_tail(&tx->skbs, tmp); skb_reserve(tmp, local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM); /* copy control information */ memcpy(tmp->cb, skb->cb, sizeof(tmp->cb)); info = IEEE80211_SKB_CB(tmp); info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT | IEEE80211_TX_CTL_FIRST_FRAGMENT); if (rem) info->flags |= IEEE80211_TX_CTL_MORE_FRAMES; skb_copy_queue_mapping(tmp, skb); tmp->priority = skb->priority; tmp->dev = skb->dev; /* copy header and data */ memcpy(skb_put(tmp, hdrlen), skb->data, hdrlen); memcpy(skb_put(tmp, fraglen), skb->data + pos, fraglen); pos += fraglen; } /* adjust first fragment's length */ skb_trim(skb, hdrlen + per_fragm); return 0; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx) { struct sk_buff *skb = tx->skb; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_hdr *hdr = (void *)skb->data; int frag_threshold = tx->local->hw.wiphy->frag_threshold; int hdrlen; int fragnum; /* no matter what happens, tx->skb moves to tx->skbs */ __skb_queue_tail(&tx->skbs, skb); tx->skb = NULL; if (info->flags & IEEE80211_TX_CTL_DONTFRAG) return TX_CONTINUE; if (tx->local->ops->set_frag_threshold) return TX_CONTINUE; /* * Warn when submitting a fragmented A-MPDU frame and drop it. * This scenario is handled in ieee80211_tx_prepare but extra * caution taken here as fragmented ampdu may cause Tx stop. */ if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU)) return TX_DROP; hdrlen = ieee80211_hdrlen(hdr->frame_control); /* internal error, why isn't DONTFRAG set? */ if (WARN_ON(skb->len + FCS_LEN <= frag_threshold)) return TX_DROP; /* * Now fragment the frame. This will allocate all the fragments and * chain them (using skb as the first fragment) to skb->next. * During transmission, we will remove the successfully transmitted * fragments from this list. When the low-level driver rejects one * of the fragments then we will simply pretend to accept the skb * but store it away as pending. */ if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold)) return TX_DROP; /* update duration/seq/flags of fragments */ fragnum = 0; skb_queue_walk(&tx->skbs, skb) { const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS); hdr = (void *)skb->data; info = IEEE80211_SKB_CB(skb); if (!skb_queue_is_last(&tx->skbs, skb)) { hdr->frame_control |= morefrags; /* * No multi-rate retries for fragmented frames, that * would completely throw off the NAV at other STAs. */ info->control.rates[1].idx = -1; info->control.rates[2].idx = -1; info->control.rates[3].idx = -1; BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4); info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE; } else { hdr->frame_control &= ~morefrags; } hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG); fragnum++; } return TX_CONTINUE; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_stats(struct ieee80211_tx_data *tx) { struct sk_buff *skb; int ac = -1; if (!tx->sta) return TX_CONTINUE; skb_queue_walk(&tx->skbs, skb) { ac = skb_get_queue_mapping(skb); tx->sta->tx_fragments++; tx->sta->tx_bytes[ac] += skb->len; } if (ac >= 0) tx->sta->tx_packets[ac]++; return TX_CONTINUE; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx) { if (!tx->key) return TX_CONTINUE; switch (tx->key->conf.cipher) { case WLAN_CIPHER_SUITE_WEP40: case WLAN_CIPHER_SUITE_WEP104: return ieee80211_crypto_wep_encrypt(tx); case WLAN_CIPHER_SUITE_TKIP: return ieee80211_crypto_tkip_encrypt(tx); case WLAN_CIPHER_SUITE_CCMP: return ieee80211_crypto_ccmp_encrypt(tx); case WLAN_CIPHER_SUITE_AES_CMAC: return ieee80211_crypto_aes_cmac_encrypt(tx); default: return ieee80211_crypto_hw_encrypt(tx); } return TX_DROP; } static ieee80211_tx_result debug_noinline ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx) { struct sk_buff *skb; struct ieee80211_hdr *hdr; int next_len; bool group_addr; skb_queue_walk(&tx->skbs, skb) { hdr = (void *) skb->data; if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) break; /* must not overwrite AID */ if (!skb_queue_is_last(&tx->skbs, skb)) { struct sk_buff *next = skb_queue_next(&tx->skbs, skb); next_len = next->len; } else next_len = 0; group_addr = is_multicast_ether_addr(hdr->addr1); hdr->duration_id = ieee80211_duration(tx, skb, group_addr, next_len); } return TX_CONTINUE; } /* actual transmit path */ static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx, struct sk_buff *skb, struct ieee80211_tx_info *info, struct tid_ampdu_tx *tid_tx, int tid) { bool queued = false; bool reset_agg_timer = false; struct sk_buff *purge_skb = NULL; if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { info->flags |= IEEE80211_TX_CTL_AMPDU; reset_agg_timer = true; } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) { /* * nothing -- this aggregation session is being started * but that might still fail with the driver */ } else { spin_lock(&tx->sta->lock); /* * Need to re-check now, because we may get here * * 1) in the window during which the setup is actually * already done, but not marked yet because not all * packets are spliced over to the driver pending * queue yet -- if this happened we acquire the lock * either before or after the splice happens, but * need to recheck which of these cases happened. * * 2) during session teardown, if the OPERATIONAL bit * was cleared due to the teardown but the pointer * hasn't been assigned NULL yet (or we loaded it * before it was assigned) -- in this case it may * now be NULL which means we should just let the * packet pass through because splicing the frames * back is already done. */ tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid); if (!tid_tx) { /* do nothing, let packet pass through */ } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) { info->flags |= IEEE80211_TX_CTL_AMPDU; reset_agg_timer = true; } else { queued = true; info->control.vif = &tx->sdata->vif; info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; __skb_queue_tail(&tid_tx->pending, skb); if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER) purge_skb = __skb_dequeue(&tid_tx->pending); } spin_unlock(&tx->sta->lock); if (purge_skb) ieee80211_free_txskb(&tx->local->hw, purge_skb); } /* reset session timer */ if (reset_agg_timer && tid_tx->timeout) tid_tx->last_tx = jiffies; return queued; } /* * initialises @tx */ static ieee80211_tx_result ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata, struct ieee80211_tx_data *tx, struct sk_buff *skb) { struct ieee80211_local *local = sdata->local; struct ieee80211_hdr *hdr; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); int tid; u8 *qc; memset(tx, 0, sizeof(*tx)); tx->skb = skb; tx->local = local; tx->sdata = sdata; __skb_queue_head_init(&tx->skbs); /* * If this flag is set to true anywhere, and we get here, * we are doing the needed processing, so remove the flag * now. */ info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING; hdr = (struct ieee80211_hdr *) skb->data; if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) { tx->sta = rcu_dereference(sdata->u.vlan.sta); if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr) return TX_DROP; } else if (info->flags & (IEEE80211_TX_CTL_INJECTED | IEEE80211_TX_INTFL_NL80211_FRAME_TX) || tx->sdata->control_port_protocol == tx->skb->protocol) { tx->sta = sta_info_get_bss(sdata, hdr->addr1); } if (!tx->sta) tx->sta = sta_info_get(sdata, hdr->addr1); if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) && !ieee80211_is_qos_nullfunc(hdr->frame_control) && (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) && !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) { struct tid_ampdu_tx *tid_tx; qc = ieee80211_get_qos_ctl(hdr); tid = *qc & IEEE80211_QOS_CTL_TID_MASK; tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]); if (tid_tx) { bool queued; queued = ieee80211_tx_prep_agg(tx, skb, info, tid_tx, tid); if (unlikely(queued)) return TX_QUEUED; } } if (is_multicast_ether_addr(hdr->addr1)) { tx->flags &= ~IEEE80211_TX_UNICAST; info->flags |= IEEE80211_TX_CTL_NO_ACK; } else tx->flags |= IEEE80211_TX_UNICAST; if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) { if (!(tx->flags & IEEE80211_TX_UNICAST) || skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold || info->flags & IEEE80211_TX_CTL_AMPDU) info->flags |= IEEE80211_TX_CTL_DONTFRAG; } if (!tx->sta) info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT; info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT; return TX_CONTINUE; } static bool ieee80211_tx_frags(struct ieee80211_local *local, struct ieee80211_vif *vif, struct ieee80211_sta *sta, struct sk_buff_head *skbs, bool txpending) { struct ieee80211_tx_control control; struct sk_buff *skb, *tmp; unsigned long flags; skb_queue_walk_safe(skbs, skb, tmp) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); int q = info->hw_queue; #ifdef CONFIG_MAC80211_VERBOSE_DEBUG if (WARN_ON_ONCE(q >= local->hw.queues)) { __skb_unlink(skb, skbs); ieee80211_free_txskb(&local->hw, skb); continue; } #endif spin_lock_irqsave(&local->queue_stop_reason_lock, flags); if (local->queue_stop_reasons[q] || (!txpending && !skb_queue_empty(&local->pending[q]))) { if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) { if (local->queue_stop_reasons[q] & ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) { /* * Drop off-channel frames if queues * are stopped for any reason other * than off-channel operation. Never * queue them. */ spin_unlock_irqrestore( &local->queue_stop_reason_lock, flags); ieee80211_purge_tx_queue(&local->hw, skbs); return true; } } else { /* * Since queue is stopped, queue up frames for * later transmission from the tx-pending * tasklet when the queue is woken again. */ if (txpending) skb_queue_splice_init(skbs, &local->pending[q]); else skb_queue_splice_tail_init(skbs, &local->pending[q]); spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); return false; } } spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); info->control.vif = vif; control.sta = sta; __skb_unlink(skb, skbs); drv_tx(local, &control, skb); } return true; } /* * Returns false if the frame couldn't be transmitted but was queued instead. */ static bool __ieee80211_tx(struct ieee80211_local *local, struct sk_buff_head *skbs, int led_len, struct sta_info *sta, bool txpending) { struct ieee80211_tx_info *info; struct ieee80211_sub_if_data *sdata; struct ieee80211_vif *vif; struct ieee80211_sta *pubsta; struct sk_buff *skb; bool result = true; __le16 fc; if (WARN_ON(skb_queue_empty(skbs))) return true; skb = skb_peek(skbs); fc = ((struct ieee80211_hdr *)skb->data)->frame_control; info = IEEE80211_SKB_CB(skb); sdata = vif_to_sdata(info->control.vif); if (sta && !sta->uploaded) sta = NULL; if (sta) pubsta = &sta->sta; else pubsta = NULL; switch (sdata->vif.type) { case NL80211_IFTYPE_MONITOR: if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) { vif = &sdata->vif; break; } sdata = rcu_dereference(local->monitor_sdata); if (sdata) { vif = &sdata->vif; info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) { dev_kfree_skb(skb); return true; } else vif = NULL; break; case NL80211_IFTYPE_AP_VLAN: sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); /* fall through */ default: vif = &sdata->vif; break; } result = ieee80211_tx_frags(local, vif, pubsta, skbs, txpending); ieee80211_tpt_led_trig_tx(local, fc, led_len); WARN_ON_ONCE(!skb_queue_empty(skbs)); return result; } /* * Invoke TX handlers, return 0 on success and non-zero if the * frame was dropped or queued. */ static int invoke_tx_handlers(struct ieee80211_tx_data *tx) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb); ieee80211_tx_result res = TX_DROP; #define CALL_TXH(txh) \ do { \ res = txh(tx); \ if (res != TX_CONTINUE) \ goto txh_done; \ } while (0) CALL_TXH(ieee80211_tx_h_dynamic_ps); CALL_TXH(ieee80211_tx_h_check_assoc); CALL_TXH(ieee80211_tx_h_ps_buf); CALL_TXH(ieee80211_tx_h_check_control_port_protocol); CALL_TXH(ieee80211_tx_h_select_key); if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) CALL_TXH(ieee80211_tx_h_rate_ctrl); if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) { __skb_queue_tail(&tx->skbs, tx->skb); tx->skb = NULL; goto txh_done; } CALL_TXH(ieee80211_tx_h_michael_mic_add); CALL_TXH(ieee80211_tx_h_sequence); CALL_TXH(ieee80211_tx_h_fragment); /* handlers after fragment must be aware of tx info fragmentation! */ CALL_TXH(ieee80211_tx_h_stats); CALL_TXH(ieee80211_tx_h_encrypt); if (!(tx->local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)) CALL_TXH(ieee80211_tx_h_calculate_duration); #undef CALL_TXH txh_done: if (unlikely(res == TX_DROP)) { I802_DEBUG_INC(tx->local->tx_handlers_drop); if (tx->skb) ieee80211_free_txskb(&tx->local->hw, tx->skb); else ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs); return -1; } else if (unlikely(res == TX_QUEUED)) { I802_DEBUG_INC(tx->local->tx_handlers_queued); return -1; } return 0; } bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw, struct ieee80211_vif *vif, struct sk_buff *skb, int band, struct ieee80211_sta **sta) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_tx_data tx; if (ieee80211_tx_prepare(sdata, &tx, skb) == TX_DROP) return false; info->band = band; info->control.vif = vif; info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)]; if (invoke_tx_handlers(&tx)) return false; if (sta) { if (tx.sta) *sta = &tx.sta->sta; else *sta = NULL; } return true; } EXPORT_SYMBOL(ieee80211_tx_prepare_skb); /* * Returns false if the frame couldn't be transmitted but was queued instead. */ static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, bool txpending, enum ieee80211_band band) { struct ieee80211_local *local = sdata->local; struct ieee80211_tx_data tx; ieee80211_tx_result res_prepare; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); bool result = true; int led_len; if (unlikely(skb->len < 10)) { dev_kfree_skb(skb); return true; } /* initialises tx */ led_len = skb->len; res_prepare = ieee80211_tx_prepare(sdata, &tx, skb); if (unlikely(res_prepare == TX_DROP)) { ieee80211_free_txskb(&local->hw, skb); return true; } else if (unlikely(res_prepare == TX_QUEUED)) { return true; } info->band = band; /* set up hw_queue value early */ if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) || !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)]; if (!invoke_tx_handlers(&tx)) result = __ieee80211_tx(local, &tx.skbs, led_len, tx.sta, txpending); return result; } /* device xmit handlers */ static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, int head_need, bool may_encrypt) { struct ieee80211_local *local = sdata->local; int tail_need = 0; if (may_encrypt && sdata->crypto_tx_tailroom_needed_cnt) { tail_need = IEEE80211_ENCRYPT_TAILROOM; tail_need -= skb_tailroom(skb); tail_need = max_t(int, tail_need, 0); } if (skb_cloned(skb)) I802_DEBUG_INC(local->tx_expand_skb_head_cloned); else if (head_need || tail_need) I802_DEBUG_INC(local->tx_expand_skb_head); else return 0; if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) { wiphy_debug(local->hw.wiphy, "failed to reallocate TX buffer\n"); return -ENOMEM; } return 0; } void ieee80211_xmit(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, enum ieee80211_band band) { struct ieee80211_local *local = sdata->local; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; int headroom; bool may_encrypt; may_encrypt = !(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT); headroom = local->tx_headroom; if (may_encrypt) headroom += IEEE80211_ENCRYPT_HEADROOM; headroom -= skb_headroom(skb); headroom = max_t(int, 0, headroom); if (ieee80211_skb_resize(sdata, skb, headroom, may_encrypt)) { ieee80211_free_txskb(&local->hw, skb); return; } hdr = (struct ieee80211_hdr *) skb->data; info->control.vif = &sdata->vif; if (ieee80211_vif_is_mesh(&sdata->vif)) { if (ieee80211_is_data(hdr->frame_control) && is_unicast_ether_addr(hdr->addr1)) { if (mesh_nexthop_resolve(sdata, skb)) return; /* skb queued: don't free */ } else { ieee80211_mps_set_frame_flags(sdata, NULL, hdr); } } ieee80211_set_qos_hdr(sdata, skb); ieee80211_tx(sdata, skb, false, band); } static bool ieee80211_parse_tx_radiotap(struct sk_buff *skb) { struct ieee80211_radiotap_iterator iterator; struct ieee80211_radiotap_header *rthdr = (struct ieee80211_radiotap_header *) skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len, NULL); u16 txflags; info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT | IEEE80211_TX_CTL_DONTFRAG; /* * for every radiotap entry that is present * (ieee80211_radiotap_iterator_next returns -ENOENT when no more * entries present, or -EINVAL on error) */ while (!ret) { ret = ieee80211_radiotap_iterator_next(&iterator); if (ret) continue; /* see if this argument is something we can use */ switch (iterator.this_arg_index) { /* * You must take care when dereferencing iterator.this_arg * for multibyte types... the pointer is not aligned. Use * get_unaligned((type *)iterator.this_arg) to dereference * iterator.this_arg for type "type" safely on all arches. */ case IEEE80211_RADIOTAP_FLAGS: if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) { /* * this indicates that the skb we have been * handed has the 32-bit FCS CRC at the end... * we should react to that by snipping it off * because it will be recomputed and added * on transmission */ if (skb->len < (iterator._max_length + FCS_LEN)) return false; skb_trim(skb, skb->len - FCS_LEN); } if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP) info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT; if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG) info->flags &= ~IEEE80211_TX_CTL_DONTFRAG; break; case IEEE80211_RADIOTAP_TX_FLAGS: txflags = get_unaligned_le16(iterator.this_arg); if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK) info->flags |= IEEE80211_TX_CTL_NO_ACK; break; /* * Please update the file * Documentation/networking/mac80211-injection.txt * when parsing new fields here. */ default: break; } } if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */ return false; /* * remove the radiotap header * iterator->_max_length was sanity-checked against * skb->len by iterator init */ skb_pull(skb, iterator._max_length); return true; } netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr); struct ieee80211_chanctx_conf *chanctx_conf; struct ieee80211_channel *chan; struct ieee80211_radiotap_header *prthdr = (struct ieee80211_radiotap_header *)skb->data; struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_hdr *hdr; struct ieee80211_sub_if_data *tmp_sdata, *sdata; u16 len_rthdr; int hdrlen; /* check for not even having the fixed radiotap header part */ if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header))) goto fail; /* too short to be possibly valid */ /* is it a header version we can trust to find length from? */ if (unlikely(prthdr->it_version)) goto fail; /* only version 0 is supported */ /* then there must be a radiotap header with a length we can use */ len_rthdr = ieee80211_get_radiotap_len(skb->data); /* does the skb contain enough to deliver on the alleged length? */ if (unlikely(skb->len < len_rthdr)) goto fail; /* skb too short for claimed rt header extent */ /* * fix up the pointers accounting for the radiotap * header still being in there. We are being given * a precooked IEEE80211 header so no need for * normal processing */ skb_set_mac_header(skb, len_rthdr); /* * these are just fixed to the end of the rt area since we * don't have any better information and at this point, nobody cares */ skb_set_network_header(skb, len_rthdr); skb_set_transport_header(skb, len_rthdr); if (skb->len < len_rthdr + 2) goto fail; hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr); hdrlen = ieee80211_hdrlen(hdr->frame_control); if (skb->len < len_rthdr + hdrlen) goto fail; /* * Initialize skb->protocol if the injected frame is a data frame * carrying a rfc1042 header */ if (ieee80211_is_data(hdr->frame_control) && skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) { u8 *payload = (u8 *)hdr + hdrlen; if (ether_addr_equal(payload, rfc1042_header)) skb->protocol = cpu_to_be16((payload[6] << 8) | payload[7]); } memset(info, 0, sizeof(*info)); info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS | IEEE80211_TX_CTL_INJECTED; /* process and remove the injection radiotap header */ if (!ieee80211_parse_tx_radiotap(skb)) goto fail; rcu_read_lock(); /* * We process outgoing injected frames that have a local address * we handle as though they are non-injected frames. * This code here isn't entirely correct, the local MAC address * isn't always enough to find the interface to use; for proper * VLAN/WDS support we will need a different mechanism (which * likely isn't going to be monitor interfaces). */ sdata = IEEE80211_DEV_TO_SUB_IF(dev); list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) { if (!ieee80211_sdata_running(tmp_sdata)) continue; if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR || tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN || tmp_sdata->vif.type == NL80211_IFTYPE_WDS) continue; if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) { sdata = tmp_sdata; break; } } chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (!chanctx_conf) { tmp_sdata = rcu_dereference(local->monitor_sdata); if (tmp_sdata) chanctx_conf = rcu_dereference(tmp_sdata->vif.chanctx_conf); } if (chanctx_conf) chan = chanctx_conf->def.chan; else if (!local->use_chanctx) chan = local->_oper_chandef.chan; else goto fail_rcu; /* * Frame injection is not allowed if beaconing is not allowed * or if we need radar detection. Beaconing is usually not allowed when * the mode or operation (Adhoc, AP, Mesh) does not support DFS. * Passive scan is also used in world regulatory domains where * your country is not known and as such it should be treated as * NO TX unless the channel is explicitly allowed in which case * your current regulatory domain would not have the passive scan * flag. * * Since AP mode uses monitor interfaces to inject/TX management * frames we can make AP mode the exception to this rule once it * supports radar detection as its implementation can deal with * radar detection by itself. We can do that later by adding a * monitor flag interfaces used for AP support. */ if ((chan->flags & (IEEE80211_CHAN_NO_IBSS | IEEE80211_CHAN_RADAR | IEEE80211_CHAN_PASSIVE_SCAN))) goto fail_rcu; ieee80211_xmit(sdata, skb, chan->band); rcu_read_unlock(); return NETDEV_TX_OK; fail_rcu: rcu_read_unlock(); fail: dev_kfree_skb(skb); return NETDEV_TX_OK; /* meaning, we dealt with the skb */ } /** * ieee80211_subif_start_xmit - netif start_xmit function for Ethernet-type * subinterfaces (wlan#, WDS, and VLAN interfaces) * @skb: packet to be sent * @dev: incoming interface * * Returns: 0 on success (and frees skb in this case) or 1 on failure (skb will * not be freed, and caller is responsible for either retrying later or freeing * skb). * * This function takes in an Ethernet header and encapsulates it with suitable * IEEE 802.11 header based on which interface the packet is coming in. The * encapsulated packet will then be passed to master interface, wlan#.11, for * transmission (through low-level driver). */ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb, struct net_device *dev) { struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); struct ieee80211_local *local = sdata->local; struct ieee80211_tx_info *info; int head_need; u16 ethertype, hdrlen, meshhdrlen = 0; __le16 fc; struct ieee80211_hdr hdr; struct ieee80211s_hdr mesh_hdr __maybe_unused; struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL; const u8 *encaps_data; int encaps_len, skip_header_bytes; int nh_pos, h_pos; struct sta_info *sta = NULL; bool wme_sta = false, authorized = false, tdls_auth = false; bool tdls_direct = false; bool multicast; u32 info_flags = 0; u16 info_id = 0; struct ieee80211_chanctx_conf *chanctx_conf; struct ieee80211_sub_if_data *ap_sdata; enum ieee80211_band band; if (unlikely(skb->len < ETH_HLEN)) goto fail; /* convert Ethernet header to proper 802.11 header (based on * operation mode) */ ethertype = (skb->data[12] << 8) | skb->data[13]; fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA); rcu_read_lock(); switch (sdata->vif.type) { case NL80211_IFTYPE_AP_VLAN: sta = rcu_dereference(sdata->u.vlan.sta); if (sta) { fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); /* RA TA DA SA */ memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN); memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); memcpy(hdr.addr3, skb->data, ETH_ALEN); memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); hdrlen = 30; authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); wme_sta = test_sta_flag(sta, WLAN_STA_WME); } ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap); chanctx_conf = rcu_dereference(ap_sdata->vif.chanctx_conf); if (!chanctx_conf) goto fail_rcu; band = chanctx_conf->def.chan->band; if (sta) break; /* fall through */ case NL80211_IFTYPE_AP: if (sdata->vif.type == NL80211_IFTYPE_AP) chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (!chanctx_conf) goto fail_rcu; fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS); /* DA BSSID SA */ memcpy(hdr.addr1, skb->data, ETH_ALEN); memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN); hdrlen = 24; band = chanctx_conf->def.chan->band; break; case NL80211_IFTYPE_WDS: fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); /* RA TA DA SA */ memcpy(hdr.addr1, sdata->u.wds.remote_addr, ETH_ALEN); memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); memcpy(hdr.addr3, skb->data, ETH_ALEN); memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); hdrlen = 30; /* * This is the exception! WDS style interfaces are prohibited * when channel contexts are in used so this must be valid */ band = local->hw.conf.chandef.chan->band; break; #ifdef CONFIG_MAC80211_MESH case NL80211_IFTYPE_MESH_POINT: if (!is_multicast_ether_addr(skb->data)) { struct sta_info *next_hop; bool mpp_lookup = true; mpath = mesh_path_lookup(sdata, skb->data); if (mpath) { mpp_lookup = false; next_hop = rcu_dereference(mpath->next_hop); if (!next_hop || !(mpath->flags & (MESH_PATH_ACTIVE | MESH_PATH_RESOLVING))) mpp_lookup = true; } if (mpp_lookup) mppath = mpp_path_lookup(sdata, skb->data); if (mppath && mpath) mesh_path_del(mpath->sdata, mpath->dst); } /* * Use address extension if it is a packet from * another interface or if we know the destination * is being proxied by a portal (i.e. portal address * differs from proxied address) */ if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) && !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) { hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, skb->data, skb->data + ETH_ALEN); meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr, NULL, NULL); } else { /* DS -> MBSS (802.11-2012 13.11.3.3). * For unicast with unknown forwarding information, * destination might be in the MBSS or if that fails * forwarded to another mesh gate. In either case * resolution will be handled in ieee80211_xmit(), so * leave the original DA. This also works for mcast */ const u8 *mesh_da = skb->data; if (mppath) mesh_da = mppath->mpp; else if (mpath) mesh_da = mpath->dst; hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc, mesh_da, sdata->vif.addr); if (is_multicast_ether_addr(mesh_da)) /* DA TA mSA AE:SA */ meshhdrlen = ieee80211_new_mesh_header( sdata, &mesh_hdr, skb->data + ETH_ALEN, NULL); else /* RA TA mDA mSA AE:DA SA */ meshhdrlen = ieee80211_new_mesh_header( sdata, &mesh_hdr, skb->data, skb->data + ETH_ALEN); } chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (!chanctx_conf) goto fail_rcu; band = chanctx_conf->def.chan->band; break; #endif case NL80211_IFTYPE_STATION: if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) { bool tdls_peer = false; sta = sta_info_get(sdata, skb->data); if (sta) { authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); wme_sta = test_sta_flag(sta, WLAN_STA_WME); tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER); tdls_auth = test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); } /* * If the TDLS link is enabled, send everything * directly. Otherwise, allow TDLS setup frames * to be transmitted indirectly. */ tdls_direct = tdls_peer && (tdls_auth || !(ethertype == ETH_P_TDLS && skb->len > 14 && skb->data[14] == WLAN_TDLS_SNAP_RFTYPE)); } if (tdls_direct) { /* link during setup - throw out frames to peer */ if (!tdls_auth) goto fail_rcu; /* DA SA BSSID */ memcpy(hdr.addr1, skb->data, ETH_ALEN); memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN); hdrlen = 24; } else if (sdata->u.mgd.use_4addr && cpu_to_be16(ethertype) != sdata->control_port_protocol) { fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); /* RA TA DA SA */ memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN); memcpy(hdr.addr3, skb->data, ETH_ALEN); memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN); hdrlen = 30; } else { fc |= cpu_to_le16(IEEE80211_FCTL_TODS); /* BSSID SA DA */ memcpy(hdr.addr1, sdata->u.mgd.bssid, ETH_ALEN); memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); memcpy(hdr.addr3, skb->data, ETH_ALEN); hdrlen = 24; } chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (!chanctx_conf) goto fail_rcu; band = chanctx_conf->def.chan->band; break; case NL80211_IFTYPE_ADHOC: /* DA SA BSSID */ memcpy(hdr.addr1, skb->data, ETH_ALEN); memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN); memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN); hdrlen = 24; chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (!chanctx_conf) goto fail_rcu; band = chanctx_conf->def.chan->band; break; default: goto fail_rcu; } /* * There's no need to try to look up the destination * if it is a multicast address (which can only happen * in AP mode) */ multicast = is_multicast_ether_addr(hdr.addr1); if (!multicast) { sta = sta_info_get(sdata, hdr.addr1); if (sta) { authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED); wme_sta = test_sta_flag(sta, WLAN_STA_WME); } } /* For mesh, the use of the QoS header is mandatory */ if (ieee80211_vif_is_mesh(&sdata->vif)) wme_sta = true; /* receiver and we are QoS enabled, use a QoS type frame */ if (wme_sta && local->hw.queues >= IEEE80211_NUM_ACS) { fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA); hdrlen += 2; } /* * Drop unicast frames to unauthorised stations unless they are * EAPOL frames from the local station. */ if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) && !multicast && !authorized && (cpu_to_be16(ethertype) != sdata->control_port_protocol || !ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN)))) { #ifdef CONFIG_MAC80211_VERBOSE_DEBUG net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n", dev->name, hdr.addr1); #endif I802_DEBUG_INC(local->tx_handlers_drop_unauth_port); goto fail_rcu; } if (unlikely(!multicast && skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)) { struct sk_buff *orig_skb = skb; skb = skb_clone(skb, GFP_ATOMIC); if (skb) { unsigned long flags; int id; spin_lock_irqsave(&local->ack_status_lock, flags); id = idr_alloc(&local->ack_status_frames, orig_skb, 1, 0x10000, GFP_ATOMIC); spin_unlock_irqrestore(&local->ack_status_lock, flags); if (id >= 0) { info_id = id; info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS; } else if (skb_shared(skb)) { kfree_skb(orig_skb); } else { kfree_skb(skb); skb = orig_skb; } } else { /* couldn't clone -- lose tx status ... */ skb = orig_skb; } } /* * If the skb is shared we need to obtain our own copy. */ if (skb_shared(skb)) { struct sk_buff *tmp_skb = skb; /* can't happen -- skb is a clone if info_id != 0 */ WARN_ON(info_id); skb = skb_clone(skb, GFP_ATOMIC); kfree_skb(tmp_skb); if (!skb) goto fail_rcu; } hdr.frame_control = fc; hdr.duration_id = 0; hdr.seq_ctrl = 0; skip_header_bytes = ETH_HLEN; if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { encaps_data = bridge_tunnel_header; encaps_len = sizeof(bridge_tunnel_header); skip_header_bytes -= 2; } else if (ethertype >= ETH_P_802_3_MIN) { encaps_data = rfc1042_header; encaps_len = sizeof(rfc1042_header); skip_header_bytes -= 2; } else { encaps_data = NULL; encaps_len = 0; } nh_pos = skb_network_header(skb) - skb->data; h_pos = skb_transport_header(skb) - skb->data; skb_pull(skb, skip_header_bytes); nh_pos -= skip_header_bytes; h_pos -= skip_header_bytes; head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb); /* * So we need to modify the skb header and hence need a copy of * that. The head_need variable above doesn't, so far, include * the needed header space that we don't need right away. If we * can, then we don't reallocate right now but only after the * frame arrives at the master device (if it does...) * * If we cannot, however, then we will reallocate to include all * the ever needed space. Also, if we need to reallocate it anyway, * make it big enough for everything we may ever need. */ if (head_need > 0 || skb_cloned(skb)) { head_need += IEEE80211_ENCRYPT_HEADROOM; head_need += local->tx_headroom; head_need = max_t(int, 0, head_need); if (ieee80211_skb_resize(sdata, skb, head_need, true)) { ieee80211_free_txskb(&local->hw, skb); skb = NULL; goto fail_rcu; } } if (encaps_data) { memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); nh_pos += encaps_len; h_pos += encaps_len; } #ifdef CONFIG_MAC80211_MESH if (meshhdrlen > 0) { memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen); nh_pos += meshhdrlen; h_pos += meshhdrlen; } #endif if (ieee80211_is_data_qos(fc)) { __le16 *qos_control; qos_control = (__le16*) skb_push(skb, 2); memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2); /* * Maybe we could actually set some fields here, for now just * initialise to zero to indicate no special operation. */ *qos_control = 0; } else memcpy(skb_push(skb, hdrlen), &hdr, hdrlen); nh_pos += hdrlen; h_pos += hdrlen; dev->stats.tx_packets++; dev->stats.tx_bytes += skb->len; /* Update skb pointers to various headers since this modified frame * is going to go through Linux networking code that may potentially * need things like pointer to IP header. */ skb_set_mac_header(skb, 0); skb_set_network_header(skb, nh_pos); skb_set_transport_header(skb, h_pos); info = IEEE80211_SKB_CB(skb); memset(info, 0, sizeof(*info)); dev->trans_start = jiffies; info->flags = info_flags; info->ack_frame_id = info_id; ieee80211_xmit(sdata, skb, band); rcu_read_unlock(); return NETDEV_TX_OK; fail_rcu: rcu_read_unlock(); fail: dev_kfree_skb(skb); return NETDEV_TX_OK; } /* * ieee80211_clear_tx_pending may not be called in a context where * it is possible that it packets could come in again. */ void ieee80211_clear_tx_pending(struct ieee80211_local *local) { struct sk_buff *skb; int i; for (i = 0; i < local->hw.queues; i++) { while ((skb = skb_dequeue(&local->pending[i])) != NULL) ieee80211_free_txskb(&local->hw, skb); } } /* * Returns false if the frame couldn't be transmitted but was queued instead, * which in this case means re-queued -- take as an indication to stop sending * more pending frames. */ static bool ieee80211_tx_pending_skb(struct ieee80211_local *local, struct sk_buff *skb) { struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_sub_if_data *sdata; struct sta_info *sta; struct ieee80211_hdr *hdr; bool result; struct ieee80211_chanctx_conf *chanctx_conf; sdata = vif_to_sdata(info->control.vif); if (info->flags & IEEE80211_TX_INTFL_NEED_TXPROCESSING) { chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (unlikely(!chanctx_conf)) { dev_kfree_skb(skb); return true; } result = ieee80211_tx(sdata, skb, true, chanctx_conf->def.chan->band); } else { struct sk_buff_head skbs; __skb_queue_head_init(&skbs); __skb_queue_tail(&skbs, skb); hdr = (struct ieee80211_hdr *)skb->data; sta = sta_info_get(sdata, hdr->addr1); result = __ieee80211_tx(local, &skbs, skb->len, sta, true); } return result; } /* * Transmit all pending packets. Called from tasklet. */ void ieee80211_tx_pending(unsigned long data) { struct ieee80211_local *local = (struct ieee80211_local *)data; unsigned long flags; int i; bool txok; rcu_read_lock(); spin_lock_irqsave(&local->queue_stop_reason_lock, flags); for (i = 0; i < local->hw.queues; i++) { /* * If queue is stopped by something other than due to pending * frames, or we have no pending frames, proceed to next queue. */ if (local->queue_stop_reasons[i] || skb_queue_empty(&local->pending[i])) continue; while (!skb_queue_empty(&local->pending[i])) { struct sk_buff *skb = __skb_dequeue(&local->pending[i]); struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); if (WARN_ON(!info->control.vif)) { ieee80211_free_txskb(&local->hw, skb); continue; } spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); txok = ieee80211_tx_pending_skb(local, skb); spin_lock_irqsave(&local->queue_stop_reason_lock, flags); if (!txok) break; } if (skb_queue_empty(&local->pending[i])) ieee80211_propagate_queue_wake(local, i); } spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); rcu_read_unlock(); } /* functions for drivers to get certain frames */ static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, struct ps_data *ps, struct sk_buff *skb) { u8 *pos, *tim; int aid0 = 0; int i, have_bits = 0, n1, n2; /* Generate bitmap for TIM only if there are any STAs in power save * mode. */ if (atomic_read(&ps->num_sta_ps) > 0) /* in the hope that this is faster than * checking byte-for-byte */ have_bits = !bitmap_empty((unsigned long*)ps->tim, IEEE80211_MAX_AID+1); if (ps->dtim_count == 0) ps->dtim_count = sdata->vif.bss_conf.dtim_period - 1; else ps->dtim_count--; tim = pos = (u8 *) skb_put(skb, 6); *pos++ = WLAN_EID_TIM; *pos++ = 4; *pos++ = ps->dtim_count; *pos++ = sdata->vif.bss_conf.dtim_period; if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf)) aid0 = 1; ps->dtim_bc_mc = aid0 == 1; if (have_bits) { /* Find largest even number N1 so that bits numbered 1 through * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits * (N2 + 1) x 8 through 2007 are 0. */ n1 = 0; for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) { if (ps->tim[i]) { n1 = i & 0xfe; break; } } n2 = n1; for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) { if (ps->tim[i]) { n2 = i; break; } } /* Bitmap control */ *pos++ = n1 | aid0; /* Part Virt Bitmap */ skb_put(skb, n2 - n1); memcpy(pos, ps->tim + n1, n2 - n1 + 1); tim[1] = n2 - n1 + 4; } else { *pos++ = aid0; /* Bitmap control */ *pos++ = 0; /* Part Virt Bitmap */ } } static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata, struct ps_data *ps, struct sk_buff *skb) { struct ieee80211_local *local = sdata->local; /* * Not very nice, but we want to allow the driver to call * ieee80211_beacon_get() as a response to the set_tim() * callback. That, however, is already invoked under the * sta_lock to guarantee consistent and race-free update * of the tim bitmap in mac80211 and the driver. */ if (local->tim_in_locked_section) { __ieee80211_beacon_add_tim(sdata, ps, skb); } else { spin_lock_bh(&local->tim_lock); __ieee80211_beacon_add_tim(sdata, ps, skb); spin_unlock_bh(&local->tim_lock); } return 0; } void ieee80211_csa_finish(struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); ieee80211_queue_work(&sdata->local->hw, &sdata->csa_finalize_work); } EXPORT_SYMBOL(ieee80211_csa_finish); static void ieee80211_update_csa(struct ieee80211_sub_if_data *sdata, struct beacon_data *beacon) { struct probe_resp *resp; int counter_offset_beacon = sdata->csa_counter_offset_beacon; int counter_offset_presp = sdata->csa_counter_offset_presp; u8 *beacon_data; size_t beacon_data_len; switch (sdata->vif.type) { case NL80211_IFTYPE_AP: beacon_data = beacon->tail; beacon_data_len = beacon->tail_len; break; case NL80211_IFTYPE_ADHOC: beacon_data = beacon->head; beacon_data_len = beacon->head_len; break; case NL80211_IFTYPE_MESH_POINT: beacon_data = beacon->head; beacon_data_len = beacon->head_len; break; default: return; } if (WARN_ON(counter_offset_beacon >= beacon_data_len)) return; /* warn if the driver did not check for/react to csa completeness */ if (WARN_ON(beacon_data[counter_offset_beacon] == 0)) return; beacon_data[counter_offset_beacon]--; if (sdata->vif.type == NL80211_IFTYPE_AP && counter_offset_presp) { rcu_read_lock(); resp = rcu_dereference(sdata->u.ap.probe_resp); /* if nl80211 accepted the offset, this should not happen. */ if (WARN_ON(!resp)) { rcu_read_unlock(); return; } resp->data[counter_offset_presp]--; rcu_read_unlock(); } } bool ieee80211_csa_is_complete(struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); struct beacon_data *beacon = NULL; u8 *beacon_data; size_t beacon_data_len; int counter_beacon = sdata->csa_counter_offset_beacon; int ret = false; if (!ieee80211_sdata_running(sdata)) return false; rcu_read_lock(); if (vif->type == NL80211_IFTYPE_AP) { struct ieee80211_if_ap *ap = &sdata->u.ap; beacon = rcu_dereference(ap->beacon); if (WARN_ON(!beacon || !beacon->tail)) goto out; beacon_data = beacon->tail; beacon_data_len = beacon->tail_len; } else if (vif->type == NL80211_IFTYPE_ADHOC) { struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; beacon = rcu_dereference(ifibss->presp); if (!beacon) goto out; beacon_data = beacon->head; beacon_data_len = beacon->head_len; } else if (vif->type == NL80211_IFTYPE_MESH_POINT) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; beacon = rcu_dereference(ifmsh->beacon); if (!beacon) goto out; beacon_data = beacon->head; beacon_data_len = beacon->head_len; } else { WARN_ON(1); goto out; } if (WARN_ON(counter_beacon > beacon_data_len)) goto out; if (beacon_data[counter_beacon] == 0) ret = true; out: rcu_read_unlock(); return ret; } EXPORT_SYMBOL(ieee80211_csa_is_complete); struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u16 *tim_offset, u16 *tim_length) { struct ieee80211_local *local = hw_to_local(hw); struct sk_buff *skb = NULL; struct ieee80211_tx_info *info; struct ieee80211_sub_if_data *sdata = NULL; enum ieee80211_band band; struct ieee80211_tx_rate_control txrc; struct ieee80211_chanctx_conf *chanctx_conf; rcu_read_lock(); sdata = vif_to_sdata(vif); chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (!ieee80211_sdata_running(sdata) || !chanctx_conf) goto out; if (tim_offset) *tim_offset = 0; if (tim_length) *tim_length = 0; if (sdata->vif.type == NL80211_IFTYPE_AP) { struct ieee80211_if_ap *ap = &sdata->u.ap; struct beacon_data *beacon = rcu_dereference(ap->beacon); if (beacon) { if (sdata->vif.csa_active) ieee80211_update_csa(sdata, beacon); /* * headroom, head length, * tail length and maximum TIM length */ skb = dev_alloc_skb(local->tx_headroom + beacon->head_len + beacon->tail_len + 256); if (!skb) goto out; skb_reserve(skb, local->tx_headroom); memcpy(skb_put(skb, beacon->head_len), beacon->head, beacon->head_len); ieee80211_beacon_add_tim(sdata, &ap->ps, skb); if (tim_offset) *tim_offset = beacon->head_len; if (tim_length) *tim_length = skb->len - beacon->head_len; if (beacon->tail) memcpy(skb_put(skb, beacon->tail_len), beacon->tail, beacon->tail_len); } else goto out; } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { struct ieee80211_if_ibss *ifibss = &sdata->u.ibss; struct ieee80211_hdr *hdr; struct beacon_data *presp = rcu_dereference(ifibss->presp); if (!presp) goto out; if (sdata->vif.csa_active) ieee80211_update_csa(sdata, presp); skb = dev_alloc_skb(local->tx_headroom + presp->head_len); if (!skb) goto out; skb_reserve(skb, local->tx_headroom); memcpy(skb_put(skb, presp->head_len), presp->head, presp->head_len); hdr = (struct ieee80211_hdr *) skb->data; hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON); } else if (ieee80211_vif_is_mesh(&sdata->vif)) { struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; struct beacon_data *bcn = rcu_dereference(ifmsh->beacon); if (!bcn) goto out; if (sdata->vif.csa_active) ieee80211_update_csa(sdata, bcn); if (ifmsh->sync_ops) ifmsh->sync_ops->adjust_tbtt( sdata); skb = dev_alloc_skb(local->tx_headroom + bcn->head_len + 256 + /* TIM IE */ bcn->tail_len); if (!skb) goto out; skb_reserve(skb, local->tx_headroom); memcpy(skb_put(skb, bcn->head_len), bcn->head, bcn->head_len); ieee80211_beacon_add_tim(sdata, &ifmsh->ps, skb); memcpy(skb_put(skb, bcn->tail_len), bcn->tail, bcn->tail_len); } else { WARN_ON(1); goto out; } band = chanctx_conf->def.chan->band; info = IEEE80211_SKB_CB(skb); info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; info->flags |= IEEE80211_TX_CTL_NO_ACK; info->band = band; memset(&txrc, 0, sizeof(txrc)); txrc.hw = hw; txrc.sband = local->hw.wiphy->bands[band]; txrc.bss_conf = &sdata->vif.bss_conf; txrc.skb = skb; txrc.reported_rate.idx = -1; txrc.rate_idx_mask = sdata->rc_rateidx_mask[band]; if (txrc.rate_idx_mask == (1 << txrc.sband->n_bitrates) - 1) txrc.max_rate_idx = -1; else txrc.max_rate_idx = fls(txrc.rate_idx_mask) - 1; txrc.bss = true; rate_control_get_rate(sdata, NULL, &txrc); info->control.vif = vif; info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT | IEEE80211_TX_CTL_ASSIGN_SEQ | IEEE80211_TX_CTL_FIRST_FRAGMENT; out: rcu_read_unlock(); return skb; } EXPORT_SYMBOL(ieee80211_beacon_get_tim); struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif) { struct ieee80211_if_ap *ap = NULL; struct sk_buff *skb = NULL; struct probe_resp *presp = NULL; struct ieee80211_hdr *hdr; struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); if (sdata->vif.type != NL80211_IFTYPE_AP) return NULL; rcu_read_lock(); ap = &sdata->u.ap; presp = rcu_dereference(ap->probe_resp); if (!presp) goto out; skb = dev_alloc_skb(presp->len); if (!skb) goto out; memcpy(skb_put(skb, presp->len), presp->data, presp->len); hdr = (struct ieee80211_hdr *) skb->data; memset(hdr->addr1, 0, sizeof(hdr->addr1)); out: rcu_read_unlock(); return skb; } EXPORT_SYMBOL(ieee80211_proberesp_get); struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif) { struct ieee80211_sub_if_data *sdata; struct ieee80211_if_managed *ifmgd; struct ieee80211_pspoll *pspoll; struct ieee80211_local *local; struct sk_buff *skb; if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) return NULL; sdata = vif_to_sdata(vif); ifmgd = &sdata->u.mgd; local = sdata->local; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll)); if (!skb) return NULL; skb_reserve(skb, local->hw.extra_tx_headroom); pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll)); memset(pspoll, 0, sizeof(*pspoll)); pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL); pspoll->aid = cpu_to_le16(ifmgd->aid); /* aid in PS-Poll has its two MSBs each set to 1 */ pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14); memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN); memcpy(pspoll->ta, vif->addr, ETH_ALEN); return skb; } EXPORT_SYMBOL(ieee80211_pspoll_get); struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif) { struct ieee80211_hdr_3addr *nullfunc; struct ieee80211_sub_if_data *sdata; struct ieee80211_if_managed *ifmgd; struct ieee80211_local *local; struct sk_buff *skb; if (WARN_ON(vif->type != NL80211_IFTYPE_STATION)) return NULL; sdata = vif_to_sdata(vif); ifmgd = &sdata->u.mgd; local = sdata->local; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*nullfunc)); if (!skb) return NULL; skb_reserve(skb, local->hw.extra_tx_headroom); nullfunc = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*nullfunc)); memset(nullfunc, 0, sizeof(*nullfunc)); nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | IEEE80211_FCTL_TODS); memcpy(nullfunc->addr1, ifmgd->bssid, ETH_ALEN); memcpy(nullfunc->addr2, vif->addr, ETH_ALEN); memcpy(nullfunc->addr3, ifmgd->bssid, ETH_ALEN); return skb; } EXPORT_SYMBOL(ieee80211_nullfunc_get); struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, const u8 *ssid, size_t ssid_len, size_t tailroom) { struct ieee80211_sub_if_data *sdata; struct ieee80211_local *local; struct ieee80211_hdr_3addr *hdr; struct sk_buff *skb; size_t ie_ssid_len; u8 *pos; sdata = vif_to_sdata(vif); local = sdata->local; ie_ssid_len = 2 + ssid_len; skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) + ie_ssid_len + tailroom); if (!skb) return NULL; skb_reserve(skb, local->hw.extra_tx_headroom); hdr = (struct ieee80211_hdr_3addr *) skb_put(skb, sizeof(*hdr)); memset(hdr, 0, sizeof(*hdr)); hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_REQ); eth_broadcast_addr(hdr->addr1); memcpy(hdr->addr2, vif->addr, ETH_ALEN); eth_broadcast_addr(hdr->addr3); pos = skb_put(skb, ie_ssid_len); *pos++ = WLAN_EID_SSID; *pos++ = ssid_len; if (ssid_len) memcpy(pos, ssid, ssid_len); pos += ssid_len; return skb; } EXPORT_SYMBOL(ieee80211_probereq_get); void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, const void *frame, size_t frame_len, const struct ieee80211_tx_info *frame_txctl, struct ieee80211_rts *rts) { const struct ieee80211_hdr *hdr = frame; rts->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); rts->duration = ieee80211_rts_duration(hw, vif, frame_len, frame_txctl); memcpy(rts->ra, hdr->addr1, sizeof(rts->ra)); memcpy(rts->ta, hdr->addr2, sizeof(rts->ta)); } EXPORT_SYMBOL(ieee80211_rts_get); void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif, const void *frame, size_t frame_len, const struct ieee80211_tx_info *frame_txctl, struct ieee80211_cts *cts) { const struct ieee80211_hdr *hdr = frame; cts->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS); cts->duration = ieee80211_ctstoself_duration(hw, vif, frame_len, frame_txctl); memcpy(cts->ra, hdr->addr1, sizeof(cts->ra)); } EXPORT_SYMBOL(ieee80211_ctstoself_get); struct sk_buff * ieee80211_get_buffered_bc(struct ieee80211_hw *hw, struct ieee80211_vif *vif) { struct ieee80211_local *local = hw_to_local(hw); struct sk_buff *skb = NULL; struct ieee80211_tx_data tx; struct ieee80211_sub_if_data *sdata; struct ps_data *ps; struct ieee80211_tx_info *info; struct ieee80211_chanctx_conf *chanctx_conf; sdata = vif_to_sdata(vif); rcu_read_lock(); chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf); if (!chanctx_conf) goto out; if (sdata->vif.type == NL80211_IFTYPE_AP) { struct beacon_data *beacon = rcu_dereference(sdata->u.ap.beacon); if (!beacon || !beacon->head) goto out; ps = &sdata->u.ap.ps; } else if (ieee80211_vif_is_mesh(&sdata->vif)) { ps = &sdata->u.mesh.ps; } else { goto out; } if (ps->dtim_count != 0 || !ps->dtim_bc_mc) goto out; /* send buffered bc/mc only after DTIM beacon */ while (1) { skb = skb_dequeue(&ps->bc_buf); if (!skb) goto out; local->total_ps_buffered--; if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) { struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; /* more buffered multicast/broadcast frames ==> set * MoreData flag in IEEE 802.11 header to inform PS * STAs */ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); } if (sdata->vif.type == NL80211_IFTYPE_AP) sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev); if (!ieee80211_tx_prepare(sdata, &tx, skb)) break; dev_kfree_skb_any(skb); } info = IEEE80211_SKB_CB(skb); tx.flags |= IEEE80211_TX_PS_BUFFERED; info->band = chanctx_conf->def.chan->band; if (invoke_tx_handlers(&tx)) skb = NULL; out: rcu_read_unlock(); return skb; } EXPORT_SYMBOL(ieee80211_get_buffered_bc); void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb, int tid, enum ieee80211_band band) { int ac = ieee802_1d_to_ac[tid & 7]; skb_set_mac_header(skb, 0); skb_set_network_header(skb, 0); skb_set_transport_header(skb, 0); skb_set_queue_mapping(skb, ac); skb->priority = tid; skb->dev = sdata->dev; /* * The other path calling ieee80211_xmit is from the tasklet, * and while we can handle concurrent transmissions locking * requirements are that we do not come into tx with bhs on. */ local_bh_disable(); ieee80211_xmit(sdata, skb, band); local_bh_enable(); }