freebsd-dev/sys/net80211/ieee80211_power.c
Sam Leffler b105a06908 Update beacon handling to sync w/ vap code base:
o add driver callback to handle notification of beacon changes;
  this is required for devices that manage beacon frames themselves
  (devices must override the default handler which does nothing)
o move beacon update-related flags from ieee80211com to the beacon
  offsets storage (or handle however a driver wants)
o expand beacon offsets structure with members needed for 11h/dfs
  and appie's
o change calling convention for ieee80211_beacon_alloc and
  ieee80211_beacon_update
o add overlapping bss support for 11g; requires driver to pass
  beacon frames from overlapping bss up to net80211 which is not
  presently done by any driver
o move HT beacon contents update to a routine in the HT code area

Reviewed by:	avatar, thompsa, sephe
Approved by:	re (blanket wireless)
2007-09-17 19:07:24 +00:00

330 lines
9.3 KiB
C

/*-
* Copyright (c) 2002-2007 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.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* IEEE 802.11 power save support.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net80211/ieee80211_var.h>
#include <net/bpf.h>
static void ieee80211_set_tim(struct ieee80211_node *ni, int set);
void
ieee80211_power_attach(struct ieee80211com *ic)
{
if (ic->ic_opmode == IEEE80211_M_HOSTAP ||
ic->ic_opmode == IEEE80211_M_IBSS) {
/* NB: driver should override */
ic->ic_set_tim = ieee80211_set_tim;
}
}
void
ieee80211_power_lateattach(struct ieee80211com *ic)
{
/*
* Allocate these only if needed. Beware that we
* know adhoc mode doesn't support ATIM yet...
*/
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
ic->ic_tim_len = howmany(ic->ic_max_aid,8) * sizeof(uint8_t);
MALLOC(ic->ic_tim_bitmap, uint8_t *, ic->ic_tim_len,
M_DEVBUF, M_NOWAIT | M_ZERO);
if (ic->ic_tim_bitmap == NULL) {
printf("%s: no memory for TIM bitmap!\n", __func__);
/* XXX good enough to keep from crashing? */
ic->ic_tim_len = 0;
}
}
}
void
ieee80211_power_detach(struct ieee80211com *ic)
{
if (ic->ic_tim_bitmap != NULL) {
FREE(ic->ic_tim_bitmap, M_DEVBUF);
ic->ic_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)
{
int qlen;
IEEE80211_NODE_SAVEQ_LOCK(ni);
qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
_IF_DRAIN(&ni->ni_savedq);
IEEE80211_NODE_SAVEQ_UNLOCK(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;
if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) {
struct mbuf *m;
IEEE80211_NODE_SAVEQ_LOCK(ni);
while (IF_POLL(&ni->ni_savedq, m) != NULL &&
M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_POWER, "[%s] discard frame, age %u\n", ether_sprintf(ni->ni_macaddr), M_AGE_GET(m));/*XXX*/
_IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
m_freem(m);
discard++;
}
if (m != NULL)
M_AGE_SUB(m, IEEE80211_INACT_WAIT);
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
IEEE80211_NOTE(ni->ni_ic, 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 ieee80211com *ic = ni->ni_ic;
uint16_t aid;
KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP ||
ic->ic_opmode == IEEE80211_M_IBSS,
("operating mode %u", ic->ic_opmode));
aid = IEEE80211_AID(ni->ni_associd);
KASSERT(aid < ic->ic_max_aid,
("bogus aid %u, max %u", aid, ic->ic_max_aid));
IEEE80211_BEACON_LOCK(ic);
if (set != (isset(ic->ic_tim_bitmap, aid) != 0)) {
if (set) {
setbit(ic->ic_tim_bitmap, aid);
ic->ic_ps_pending++;
} else {
clrbit(ic->ic_tim_bitmap, aid);
ic->ic_ps_pending--;
}
/* NB: we know ic is in RUN state so no need to check */
ic->ic_update_beacon(ic, IEEE80211_BEACON_TIM);
}
IEEE80211_BEACON_UNLOCK(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 mbuf *m)
{
struct ieee80211com *ic = ni->ni_ic;
int qlen, age;
IEEE80211_NODE_SAVEQ_LOCK(ni);
if (_IF_QFULL(&ni->ni_savedq)) {
_IF_DROP(&ni->ni_savedq);
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] pwr save q overflow, drops %d (size %d)\n",
ether_sprintf(ni->ni_macaddr),
ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE);
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_dumppkts(ic))
ieee80211_dump_pkt(ic, mtod(m, caddr_t), m->m_len, -1, -1);
#endif
m_freem(m);
return;
}
/*
* Tag the frame with it's 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.
*/
/* TU -> secs. XXX handle overflow? */
age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
_IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age);
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] save frame with age %d, %u now queued\n",
ether_sprintf(ni->ni_macaddr), age, qlen);
if (qlen == 1 && ic->ic_set_tim != NULL)
ic->ic_set_tim(ni, 1);
}
/*
* Handle station power-save state change.
*/
void
ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
{
struct ieee80211com *ic = ni->ni_ic;
struct mbuf *m, *mhead, *mtail;
int mcount;
if (enable) {
if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
ic->ic_ps_sta++;
ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
"power save mode on, %u sta's in ps mode", ic->ic_ps_sta);
return;
}
if (ni->ni_flags & IEEE80211_NODE_PWR_MGT)
ic->ic_ps_sta--;
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
"power save mode off, %u sta's in ps mode", ic->ic_ps_sta);
/* XXX if no stations in ps mode, flush mc frames */
/*
* Flush queued unicast frames.
*/
if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) {
if (ic->ic_set_tim != NULL)
ic->ic_set_tim(ni, 0); /* just in case */
return;
}
IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
"flush ps queue, %u packets queue", IEEE80211_NODE_SAVEQ_QLEN(ni));
/*
* Unload the frames from the ps q but don't send them
* to the driver yet. We do this in two stages to minimize
* locking but also because there's no easy way to preserve
* ordering given the existing ifnet access mechanisms.
* XXX could be optimized
*/
IEEE80211_NODE_SAVEQ_LOCK(ni);
mcount = IEEE80211_NODE_SAVEQ_QLEN(ni);
mhead = mtail = NULL;
for (;;) {
_IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
if (m == NULL)
break;
if (mhead == NULL) {
mhead = m;
m->m_nextpkt = NULL;
} else
mtail->m_nextpkt = m;
mtail = m;
}
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
if (mhead != NULL) {
/* XXX need different driver interface */
/* XXX bypasses q max */
IF_PREPEND_LIST(&ic->ic_ifp->if_snd, mhead, mtail, mcount);
}
if (ic->ic_set_tim != NULL)
ic->ic_set_tim(ni, 0);
}
/*
* Handle power-save state change in station mode.
*/
void
ieee80211_sta_pwrsave(struct ieee80211com *ic, int enable)
{
struct ieee80211_node *ni = ic->ic_bss;
int qlen;
if (!((enable != 0) ^ ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) != 0)))
return;
IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
"sta power save mode %s", enable ? "on" : "off");
if (!enable) {
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
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?
*/
qlen = IEEE80211_NODE_SAVEQ_QLEN(ni);
if (qlen != 0) {
IEEE80211_NOTE(ic, IEEE80211_MSG_POWER, ni,
"flush ps queue, %u packets queued", qlen);
for (;;) {
struct mbuf *m;
IEEE80211_NODE_SAVEQ_LOCK(ni);
_IEEE80211_NODE_SAVEQ_DEQUEUE_HEAD(ni, m);
IEEE80211_NODE_SAVEQ_UNLOCK(ni);
if (m == NULL)
break;
/* XXX need different driver interface */
/* XXX bypasses q max */
IF_ENQUEUE(&ic->ic_ifp->if_snd, m);
}
}
} else {
ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
ieee80211_send_nulldata(ieee80211_ref_node(ni));
}
}