/*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $Id$ */ #ifndef EXPORT_SYMTAB #define EXPORT_SYMTAB #endif /* * IEEE 802.11 power save support. */ #ifndef AUTOCONF_INCLUDED #include #endif #include #include #include #include #include #include "if_media.h" #include #include static void ieee80211_set_tim(struct ieee80211_node *ni, int set); void ieee80211_power_attach(struct ieee80211com *ic) { } void ieee80211_power_detach(struct ieee80211com *ic) { } void ieee80211_power_vattach(struct ieee80211vap *vap) { if (vap->iv_opmode == IEEE80211_M_HOSTAP || vap->iv_opmode == IEEE80211_M_IBSS) { /* NB: driver should override */ vap->iv_set_tim = ieee80211_set_tim; } } void ieee80211_power_latevattach(struct ieee80211vap *vap) { /* * Allocate these only if needed. Beware that we * know adhoc mode doesn't support ATIM yet... */ if (vap->iv_opmode == IEEE80211_M_HOSTAP) { vap->iv_tim_len = howmany(vap->iv_max_aid,8) * sizeof(u_int8_t); MALLOC(vap->iv_tim_bitmap, u_int8_t *, vap->iv_tim_len, M_DEVBUF, M_NOWAIT | M_ZERO); if (vap->iv_tim_bitmap == NULL) { printf("%s: no memory for TIM bitmap!\n", __func__); /* XXX good enough to keep from crashing? */ vap->iv_tim_len = 0; } } } void ieee80211_power_vdetach(struct ieee80211vap *vap) { if (vap->iv_tim_bitmap != NULL) { FREE(vap->iv_tim_bitmap, M_DEVBUF); vap->iv_tim_bitmap = NULL; } } /* * Clear any frames queued on a node's power save queue. * The number of frames that were present is returned. */ int ieee80211_node_saveq_drain(struct ieee80211_node *ni) { struct ieee80211_cb *cb = NULL; struct sk_buff *skb; int qlen; IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni); qlen = IEEE80211_NODE_SAVEQ_QLEN(ni); while ((skb = __skb_dequeue(&ni->ni_savedq)) != NULL) { cb = (struct ieee80211_cb *) skb->cb; ieee80211_unref_node(&cb->ni); dev_kfree_skb_any(skb); } IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni); return qlen; } /* * Age frames on the power save queue. The aging interval is * 4 times the listen interval specified by the station. This * number is factored into the age calculations when the frame * is placed on the queue. We store ages as time differences * so we can check and/or adjust only the head of the list. * If a frame's age exceeds the threshold then discard it. * The number of frames discarded is returned so the caller * can check if it needs to adjust the tim. */ int ieee80211_node_saveq_age(struct ieee80211_node *ni) { int discard = 0; /* XXX racey but good 'nuf? */ if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) { #ifdef IEEE80211_DEBUG struct ieee80211vap *vap = ni->ni_vap; #endif struct sk_buff *skb; IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni); while ((skb = skb_peek(&ni->ni_savedq)) != NULL && M_AGE_GET(skb) < IEEE80211_INACT_WAIT) { IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, "discard frame, age %u", M_AGE_GET(skb)); skb = __skb_dequeue(&ni->ni_savedq); dev_kfree_skb_any(skb); discard++; } if (skb != NULL) M_AGE_SUB(skb, IEEE80211_INACT_WAIT); IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni); IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, "discard %u frames for age", discard); IEEE80211_NODE_STAT_ADD(ni, ps_discard, discard); } return discard; } /* * Indicate whether there are frames queued for a station in power-save mode. */ static void ieee80211_set_tim(struct ieee80211_node *ni, int set) { struct ieee80211vap *vap = ni->ni_vap; u_int16_t aid; KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP || vap->iv_opmode == IEEE80211_M_IBSS, ("operating mode %u", vap->iv_opmode)); aid = IEEE80211_AID(ni->ni_associd); KASSERT(aid < vap->iv_max_aid, ("bogus aid %u, max %u", aid, vap->iv_max_aid)); IEEE80211_LOCK_IRQ(ni->ni_ic); if (set != (isset(vap->iv_tim_bitmap, aid) != 0)) { if (set) { setbit(vap->iv_tim_bitmap, aid); vap->iv_ps_pending++; } else { clrbit(vap->iv_tim_bitmap, aid); vap->iv_ps_pending--; } vap->iv_flags |= IEEE80211_F_TIMUPDATE; } IEEE80211_UNLOCK_IRQ(ni->ni_ic); } /* * Save an outbound packet for a node in power-save sleep state. * The new packet is placed on the node's saved queue, and the TIM * is changed, if necessary. */ void ieee80211_pwrsave(struct ieee80211_node *ni, struct sk_buff *skb) { struct ieee80211vap *vap = ni->ni_vap; struct ieee80211com *ic = ni->ni_ic; struct sk_buff *tail; int qlen, age; IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni); if (IEEE80211_NODE_SAVEQ_QLEN(ni) >= IEEE80211_PS_MAX_QUEUE) { IEEE80211_NODE_STAT(ni, psq_drops); IEEE80211_NODE_SAVEQ_UNLOCK_IRQ_EARLY(ni); IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni, "pwr save q overflow, drops %d (size %d)", ni->ni_stats.ns_psq_drops, IEEE80211_PS_MAX_QUEUE); #ifdef IEEE80211_DEBUG if (ieee80211_msg_dumppkts(vap)) ieee80211_dump_pkt(ni->ni_ic, skb->data, skb->len, -1, -1); #endif dev_kfree_skb(skb); return; } /* * Tag the frame with its expiry time and insert * it in the queue. The aging interval is 4 times * the listen interval specified by the station. * Frames that sit around too long are reclaimed * using this information. */ /* XXX handle overflow? */ age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024; /* TU -> secs */ tail = skb_peek_tail(&ni->ni_savedq); if (tail != NULL) { age -= M_AGE_GET(tail); __skb_append(tail, skb, &ni->ni_savedq); } else __skb_queue_head(&ni->ni_savedq, skb); M_AGE_SET(skb, age); qlen = IEEE80211_NODE_SAVEQ_QLEN(ni); IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni); IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, "save frame, %u now queued", qlen); if (qlen == 1 && vap->iv_set_tim != NULL) vap->iv_set_tim(ni, 1); } /* * Handle power-save state change in ap/ibss mode. */ void ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable) { struct ieee80211vap *vap = ni->ni_vap; KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP || vap->iv_opmode == IEEE80211_M_IBSS, ("unexpected operating mode %u", vap->iv_opmode)); if (enable) { if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) vap->iv_ps_sta++; ni->ni_flags |= IEEE80211_NODE_PWR_MGT; IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, "power save mode on, %u STAs in PS mode", vap->iv_ps_sta); } else { if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT)) vap->iv_ps_sta--; ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, "power save mode off, %u STAs in PS mode", vap->iv_ps_sta); /* XXX if no stations in ps mode, flush mc frames */ /* * Flush queued unicast frames. */ if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) { if (vap->iv_set_tim != NULL) vap->iv_set_tim(ni, 0); /* just in case */ return; } IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, "flush ps queue, %u packets queued", IEEE80211_NODE_SAVEQ_QLEN(ni)); for (;;) { struct sk_buff *skb; int qlen; IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni); IEEE80211_NODE_SAVEQ_DEQUEUE(ni, skb, qlen); IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni); if (skb == NULL) break; /* * If this is the last packet, turn off the TIM bit. * * Set the M_PWR_SAV bit on skb to allow encap to test for * adding MORE_DATA bit to wh. * * The 802.11 MAC Spec says we should only set MORE_DATA for * unicast packets when the STA is in PS mode (7.1.3.1.8); * which it isn't. */ #if 0 M_PWR_SAV_SET(skb); #endif #ifdef ATH_SUPERG_XR /* * if it is a XR vap, send the data to associated normal net * device. XR vap has a net device which is not registered with * OS. */ if (vap->iv_xrvap && vap->iv_flags & IEEE80211_F_XR) skb->dev = vap->iv_xrvap->iv_dev; else skb->dev = vap->iv_dev; /* XXX? unnecessary */ #endif ieee80211_parent_queue_xmit(skb); } vap->iv_set_tim(ni, 0); } } /* * Handle power-save state change in station mode. */ void ieee80211_sta_pwrsave(struct ieee80211vap *vap, int enable) { struct ieee80211_node *ni = vap->iv_bss; int qlen; if (!(enable ^ IEEE80211_VAP_IS_SLEEPING(vap))) return; IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, "STA power save mode %s", enable ? "on" : "off"); if (!enable) { IEEE80211_VAP_WAKEUP(vap); ieee80211_send_nulldata(ieee80211_ref_node(ni)); /* * Flush any queued frames; we can do this immediately * because we know they'll be queued behind the null * data frame we send the ap. * XXX: Can we use a data frame to take us out of PS mode? */ qlen = IEEE80211_NODE_SAVEQ_QLEN(ni); if (qlen != 0) { IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni, "flush PS queue, %u packets queued", qlen); for (;;) { struct sk_buff *skb; IEEE80211_NODE_SAVEQ_LOCK_IRQ(ni); skb = __skb_dequeue(&ni->ni_savedq); IEEE80211_NODE_SAVEQ_UNLOCK_IRQ(ni); if (skb == NULL) break; ieee80211_parent_queue_xmit(skb); } } } else { IEEE80211_VAP_GOTOSLEEP(vap); ieee80211_send_nulldata(ieee80211_ref_node(ni)); } }