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freebsd-skq/sys/net80211/ieee80211_node.c
adrian 2acdb6a872 Create a new task to handle 802.11n channel width changes. 
Currently, a channel width change updates the 802.11n HT info data in
net80211 but it doesn't trigger any device changes.  So the device
driver may decide that HT40 frames can be transmitted but the last
device channel set only had HT20 set.

Now, a task is scheduled so a hardware reset or change isn't done
during any active ongoing RX. It also means that it's serialised
with the other task operations (eg channel change.)

This isn't the final incantation of this work, see below.

For now, any unmodified drivers will simply receive a channel
change log entry.  A subsequent patch to ath(4) will introduce
some basic channel change handling (by resetting the NIC.)
Other NICs may need to update their rate control information.

TODO:

* There's still a small window at the present moment where the
  channel width has been updated but the task hasn't been fired.
  The final version of this should likely pass in a channel width
  field to the driver and let the driver atomically do whatever
  it needs to before changing the channel.

PR:		kern/166286
2012-03-25 03:11:57 +00:00

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2009 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("$FreeBSD$");
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.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 <net80211/ieee80211_input.h>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/ieee80211_superg.h>
#endif
#ifdef IEEE80211_SUPPORT_TDMA
#include <net80211/ieee80211_tdma.h>
#endif
#include <net80211/ieee80211_wds.h>
#include <net80211/ieee80211_mesh.h>
#include <net80211/ieee80211_ratectl.h>
#include <net/bpf.h>
/*
* IEEE80211_NODE_HASHSIZE must be a power of 2.
*/
CTASSERT((IEEE80211_NODE_HASHSIZE & (IEEE80211_NODE_HASHSIZE-1)) == 0);
/*
* Association id's are managed with a bit vector.
*/
#define IEEE80211_AID_SET(_vap, b) \
((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] |= \
(1 << (IEEE80211_AID(b) % 32)))
#define IEEE80211_AID_CLR(_vap, b) \
((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] &= \
~(1 << (IEEE80211_AID(b) % 32)))
#define IEEE80211_AID_ISSET(_vap, b) \
((_vap)->iv_aid_bitmap[IEEE80211_AID(b) / 32] & (1 << (IEEE80211_AID(b) % 32)))
#ifdef IEEE80211_DEBUG_REFCNT
#define REFCNT_LOC "%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line
#else
#define REFCNT_LOC "%s %p<%s> refcnt %d\n", __func__
#endif
static int ieee80211_sta_join1(struct ieee80211_node *);
static struct ieee80211_node *node_alloc(struct ieee80211vap *,
const uint8_t [IEEE80211_ADDR_LEN]);
static void node_cleanup(struct ieee80211_node *);
static void node_free(struct ieee80211_node *);
static void node_age(struct ieee80211_node *);
static int8_t node_getrssi(const struct ieee80211_node *);
static void node_getsignal(const struct ieee80211_node *, int8_t *, int8_t *);
static void node_getmimoinfo(const struct ieee80211_node *,
struct ieee80211_mimo_info *);
static void _ieee80211_free_node(struct ieee80211_node *);
static void ieee80211_node_table_init(struct ieee80211com *ic,
struct ieee80211_node_table *nt, const char *name,
int inact, int keymaxix);
static void ieee80211_node_table_reset(struct ieee80211_node_table *,
struct ieee80211vap *);
static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt);
static void ieee80211_erp_timeout(struct ieee80211com *);
MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state");
MALLOC_DEFINE(M_80211_NODE_IE, "80211nodeie", "802.11 node ie");
void
ieee80211_node_attach(struct ieee80211com *ic)
{
/* XXX really want maxlen enforced per-sta */
ieee80211_ageq_init(&ic->ic_stageq, ic->ic_max_keyix * 8,
"802.11 staging q");
ieee80211_node_table_init(ic, &ic->ic_sta, "station",
IEEE80211_INACT_INIT, ic->ic_max_keyix);
callout_init(&ic->ic_inact, CALLOUT_MPSAFE);
callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
ieee80211_node_timeout, ic);
ic->ic_node_alloc = node_alloc;
ic->ic_node_free = node_free;
ic->ic_node_cleanup = node_cleanup;
ic->ic_node_age = node_age;
ic->ic_node_drain = node_age; /* NB: same as age */
ic->ic_node_getrssi = node_getrssi;
ic->ic_node_getsignal = node_getsignal;
ic->ic_node_getmimoinfo = node_getmimoinfo;
/*
* Set flags to be propagated to all vap's;
* these define default behaviour/configuration.
*/
ic->ic_flags_ext |= IEEE80211_FEXT_INACT; /* inactivity processing */
}
void
ieee80211_node_detach(struct ieee80211com *ic)
{
callout_drain(&ic->ic_inact);
ieee80211_node_table_cleanup(&ic->ic_sta);
ieee80211_ageq_cleanup(&ic->ic_stageq);
}
void
ieee80211_node_vattach(struct ieee80211vap *vap)
{
/* NB: driver can override */
vap->iv_max_aid = IEEE80211_AID_DEF;
/* default station inactivity timer setings */
vap->iv_inact_init = IEEE80211_INACT_INIT;
vap->iv_inact_auth = IEEE80211_INACT_AUTH;
vap->iv_inact_run = IEEE80211_INACT_RUN;
vap->iv_inact_probe = IEEE80211_INACT_PROBE;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_INACT,
"%s: init %u auth %u run %u probe %u\n", __func__,
vap->iv_inact_init, vap->iv_inact_auth,
vap->iv_inact_run, vap->iv_inact_probe);
}
void
ieee80211_node_latevattach(struct ieee80211vap *vap)
{
if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
/* XXX should we allow max aid to be zero? */
if (vap->iv_max_aid < IEEE80211_AID_MIN) {
vap->iv_max_aid = IEEE80211_AID_MIN;
if_printf(vap->iv_ifp,
"WARNING: max aid too small, changed to %d\n",
vap->iv_max_aid);
}
vap->iv_aid_bitmap = (uint32_t *) malloc(
howmany(vap->iv_max_aid, 32) * sizeof(uint32_t),
M_80211_NODE, M_NOWAIT | M_ZERO);
if (vap->iv_aid_bitmap == NULL) {
/* XXX no way to recover */
printf("%s: no memory for AID bitmap, max aid %d!\n",
__func__, vap->iv_max_aid);
vap->iv_max_aid = 0;
}
}
ieee80211_reset_bss(vap);
vap->iv_auth = ieee80211_authenticator_get(vap->iv_bss->ni_authmode);
}
void
ieee80211_node_vdetach(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
ieee80211_node_table_reset(&ic->ic_sta, vap);
if (vap->iv_bss != NULL) {
ieee80211_free_node(vap->iv_bss);
vap->iv_bss = NULL;
}
if (vap->iv_aid_bitmap != NULL) {
free(vap->iv_aid_bitmap, M_80211_NODE);
vap->iv_aid_bitmap = NULL;
}
}
/*
* Port authorize/unauthorize interfaces for use by an authenticator.
*/
void
ieee80211_node_authorize(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
ni->ni_flags |= IEEE80211_NODE_AUTH;
ni->ni_inact_reload = vap->iv_inact_run;
ni->ni_inact = ni->ni_inact_reload;
IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
"%s: inact_reload %u", __func__, ni->ni_inact_reload);
}
void
ieee80211_node_unauthorize(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
ni->ni_flags &= ~IEEE80211_NODE_AUTH;
ni->ni_inact_reload = vap->iv_inact_auth;
if (ni->ni_inact > ni->ni_inact_reload)
ni->ni_inact = ni->ni_inact_reload;
IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
"%s: inact_reload %u inact %u", __func__,
ni->ni_inact_reload, ni->ni_inact);
}
/*
* Fix tx parameters for a node according to ``association state''.
*/
void
ieee80211_node_setuptxparms(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
enum ieee80211_phymode mode;
if (ni->ni_flags & IEEE80211_NODE_HT) {
if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
mode = IEEE80211_MODE_11NA;
else
mode = IEEE80211_MODE_11NG;
} else { /* legacy rate handling */
if (IEEE80211_IS_CHAN_ST(ni->ni_chan))
mode = IEEE80211_MODE_STURBO_A;
else if (IEEE80211_IS_CHAN_HALF(ni->ni_chan))
mode = IEEE80211_MODE_HALF;
else if (IEEE80211_IS_CHAN_QUARTER(ni->ni_chan))
mode = IEEE80211_MODE_QUARTER;
/* NB: 108A should be handled as 11a */
else if (IEEE80211_IS_CHAN_A(ni->ni_chan))
mode = IEEE80211_MODE_11A;
else if (IEEE80211_IS_CHAN_108G(ni->ni_chan) ||
(ni->ni_flags & IEEE80211_NODE_ERP))
mode = IEEE80211_MODE_11G;
else
mode = IEEE80211_MODE_11B;
}
ni->ni_txparms = &vap->iv_txparms[mode];
}
/*
* Set/change the channel. The rate set is also updated as
* to insure a consistent view by drivers.
* XXX should be private but hostap needs it to deal with CSA
*/
void
ieee80211_node_set_chan(struct ieee80211_node *ni,
struct ieee80211_channel *chan)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
enum ieee80211_phymode mode;
KASSERT(chan != IEEE80211_CHAN_ANYC, ("no channel"));
ni->ni_chan = chan;
mode = ieee80211_chan2mode(chan);
if (IEEE80211_IS_CHAN_HT(chan)) {
/*
* We must install the legacy rate est in ni_rates and the
* HT rate set in ni_htrates.
*/
ni->ni_htrates = *ieee80211_get_suphtrates(ic, chan);
/*
* Setup bss tx parameters based on operating mode. We
* use legacy rates when operating in a mixed HT+non-HT bss
* and non-ERP rates in 11g for mixed ERP+non-ERP bss.
*/
if (mode == IEEE80211_MODE_11NA &&
(vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
mode = IEEE80211_MODE_11A;
else if (mode == IEEE80211_MODE_11NG &&
(vap->iv_flags_ht & IEEE80211_FHT_PUREN) == 0)
mode = IEEE80211_MODE_11G;
if (mode == IEEE80211_MODE_11G &&
(vap->iv_flags & IEEE80211_F_PUREG) == 0)
mode = IEEE80211_MODE_11B;
}
ni->ni_txparms = &vap->iv_txparms[mode];
ni->ni_rates = *ieee80211_get_suprates(ic, chan);
}
static __inline void
copy_bss(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
{
/* propagate useful state */
nbss->ni_authmode = obss->ni_authmode;
nbss->ni_txpower = obss->ni_txpower;
nbss->ni_vlan = obss->ni_vlan;
/* XXX statistics? */
/* XXX legacy WDS bssid? */
}
void
ieee80211_create_ibss(struct ieee80211vap* vap, struct ieee80211_channel *chan)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: creating %s on channel %u\n", __func__,
ieee80211_opmode_name[vap->iv_opmode],
ieee80211_chan2ieee(ic, chan));
ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
if (ni == NULL) {
/* XXX recovery? */
return;
}
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
ni->ni_esslen = vap->iv_des_ssid[0].len;
memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
if (vap->iv_bss != NULL)
copy_bss(ni, vap->iv_bss);
ni->ni_intval = ic->ic_bintval;
if (vap->iv_flags & IEEE80211_F_PRIVACY)
ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
if (ic->ic_phytype == IEEE80211_T_FH) {
ni->ni_fhdwell = 200; /* XXX */
ni->ni_fhindex = 1;
}
if (vap->iv_opmode == IEEE80211_M_IBSS) {
vap->iv_flags |= IEEE80211_F_SIBSS;
ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */
if (vap->iv_flags & IEEE80211_F_DESBSSID)
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
else {
get_random_bytes(ni->ni_bssid, IEEE80211_ADDR_LEN);
/* clear group bit, add local bit */
ni->ni_bssid[0] = (ni->ni_bssid[0] &~ 0x01) | 0x02;
}
} else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
if (vap->iv_flags & IEEE80211_F_DESBSSID)
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
else
#ifdef IEEE80211_SUPPORT_TDMA
if ((vap->iv_caps & IEEE80211_C_TDMA) == 0)
#endif
memset(ni->ni_bssid, 0, IEEE80211_ADDR_LEN);
#ifdef IEEE80211_SUPPORT_MESH
} else if (vap->iv_opmode == IEEE80211_M_MBSS) {
ni->ni_meshidlen = vap->iv_mesh->ms_idlen;
memcpy(ni->ni_meshid, vap->iv_mesh->ms_id, ni->ni_meshidlen);
#endif
}
/*
* Fix the channel and related attributes.
*/
/* clear DFS CAC state on previous channel */
if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
ic->ic_bsschan->ic_freq != chan->ic_freq &&
IEEE80211_IS_CHAN_CACDONE(ic->ic_bsschan))
ieee80211_dfs_cac_clear(ic, ic->ic_bsschan);
ic->ic_bsschan = chan;
ieee80211_node_set_chan(ni, chan);
ic->ic_curmode = ieee80211_chan2mode(chan);
/*
* Do mode-specific setup.
*/
if (IEEE80211_IS_CHAN_FULL(chan)) {
if (IEEE80211_IS_CHAN_ANYG(chan)) {
/*
* Use a mixed 11b/11g basic rate set.
*/
ieee80211_setbasicrates(&ni->ni_rates,
IEEE80211_MODE_11G);
if (vap->iv_flags & IEEE80211_F_PUREG) {
/*
* Also mark OFDM rates basic so 11b
* stations do not join (WiFi compliance).
*/
ieee80211_addbasicrates(&ni->ni_rates,
IEEE80211_MODE_11A);
}
} else if (IEEE80211_IS_CHAN_B(chan)) {
/*
* Force pure 11b rate set.
*/
ieee80211_setbasicrates(&ni->ni_rates,
IEEE80211_MODE_11B);
}
}
(void) ieee80211_sta_join1(ieee80211_ref_node(ni));
}
/*
* Reset bss state on transition to the INIT state.
* Clear any stations from the table (they have been
* deauth'd) and reset the bss node (clears key, rate
* etc. state).
*/
void
ieee80211_reset_bss(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni, *obss;
ieee80211_node_table_reset(&ic->ic_sta, vap);
/* XXX multi-bss: wrong */
ieee80211_reset_erp(ic);
ni = ieee80211_alloc_node(&ic->ic_sta, vap, vap->iv_myaddr);
KASSERT(ni != NULL, ("unable to setup initial BSS node"));
obss = vap->iv_bss;
vap->iv_bss = ieee80211_ref_node(ni);
if (obss != NULL) {
copy_bss(ni, obss);
ni->ni_intval = ic->ic_bintval;
ieee80211_free_node(obss);
} else
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
}
static int
match_ssid(const struct ieee80211_node *ni,
int nssid, const struct ieee80211_scan_ssid ssids[])
{
int i;
for (i = 0; i < nssid; i++) {
if (ni->ni_esslen == ssids[i].len &&
memcmp(ni->ni_essid, ssids[i].ssid, ni->ni_esslen) == 0)
return 1;
}
return 0;
}
/*
* Test a node for suitability/compatibility.
*/
static int
check_bss(struct ieee80211vap *vap, struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
uint8_t rate;
if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
return 0;
if (vap->iv_opmode == IEEE80211_M_IBSS) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
return 0;
} else {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
return 0;
}
if (vap->iv_flags & IEEE80211_F_PRIVACY) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
return 0;
} else {
/* XXX does this mean privacy is supported or required? */
if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
return 0;
}
rate = ieee80211_fix_rate(ni, &ni->ni_rates,
IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
if (rate & IEEE80211_RATE_BASIC)
return 0;
if (vap->iv_des_nssid != 0 &&
!match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
return 0;
if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
!IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
return 0;
return 1;
}
#ifdef IEEE80211_DEBUG
/*
* Display node suitability/compatibility.
*/
static void
check_bss_debug(struct ieee80211vap *vap, struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
uint8_t rate;
int fail;
fail = 0;
if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
fail |= 0x01;
if (vap->iv_opmode == IEEE80211_M_IBSS) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
fail |= 0x02;
} else {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
fail |= 0x02;
}
if (vap->iv_flags & IEEE80211_F_PRIVACY) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
fail |= 0x04;
} else {
/* XXX does this mean privacy is supported or required? */
if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
fail |= 0x04;
}
rate = ieee80211_fix_rate(ni, &ni->ni_rates,
IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
if (rate & IEEE80211_RATE_BASIC)
fail |= 0x08;
if (vap->iv_des_nssid != 0 &&
!match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
fail |= 0x10;
if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
!IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
fail |= 0x20;
printf(" %c %s", fail ? '-' : '+', ether_sprintf(ni->ni_macaddr));
printf(" %s%c", ether_sprintf(ni->ni_bssid), fail & 0x20 ? '!' : ' ');
printf(" %3d%c",
ieee80211_chan2ieee(ic, ni->ni_chan), fail & 0x01 ? '!' : ' ');
printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
fail & 0x08 ? '!' : ' ');
printf(" %4s%c",
(ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
(ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
"????",
fail & 0x02 ? '!' : ' ');
printf(" %3s%c ",
(ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? "wep" : "no",
fail & 0x04 ? '!' : ' ');
ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
printf("%s\n", fail & 0x10 ? "!" : "");
}
#endif /* IEEE80211_DEBUG */
/*
* Handle 802.11 ad hoc network merge. The
* convention, set by the Wireless Ethernet Compatibility Alliance
* (WECA), is that an 802.11 station will change its BSSID to match
* the "oldest" 802.11 ad hoc network, on the same channel, that
* has the station's desired SSID. The "oldest" 802.11 network
* sends beacons with the greatest TSF timestamp.
*
* The caller is assumed to validate TSF's before attempting a merge.
*
* Return !0 if the BSSID changed, 0 otherwise.
*/
int
ieee80211_ibss_merge(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
#ifdef IEEE80211_DEBUG
struct ieee80211com *ic = ni->ni_ic;
#endif
if (ni == vap->iv_bss ||
IEEE80211_ADDR_EQ(ni->ni_bssid, vap->iv_bss->ni_bssid)) {
/* unchanged, nothing to do */
return 0;
}
if (!check_bss(vap, ni)) {
/* capabilities mismatch */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: merge failed, capabilities mismatch\n", __func__);
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_assoc(vap))
check_bss_debug(vap, ni);
#endif
vap->iv_stats.is_ibss_capmismatch++;
return 0;
}
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: new bssid %s: %s preamble, %s slot time%s\n", __func__,
ether_sprintf(ni->ni_bssid),
ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : ""
);
return ieee80211_sta_join1(ieee80211_ref_node(ni));
}
/*
* Calculate HT channel promotion flags for all vaps.
* This assumes ni_chan have been setup for each vap.
*/
static int
gethtadjustflags(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
int flags;
flags = 0;
/* XXX locking */
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
if (vap->iv_state < IEEE80211_S_RUN)
continue;
switch (vap->iv_opmode) {
case IEEE80211_M_WDS:
case IEEE80211_M_STA:
case IEEE80211_M_AHDEMO:
case IEEE80211_M_HOSTAP:
case IEEE80211_M_IBSS:
case IEEE80211_M_MBSS:
flags |= ieee80211_htchanflags(vap->iv_bss->ni_chan);
break;
default:
break;
}
}
return flags;
}
/*
* Check if the current channel needs to change based on whether
* any vap's are using HT20/HT40. This is used to sync the state
* of ic_curchan after a channel width change on a running vap.
*/
void
ieee80211_sync_curchan(struct ieee80211com *ic)
{
struct ieee80211_channel *c;
c = ieee80211_ht_adjust_channel(ic, ic->ic_curchan, gethtadjustflags(ic));
if (c != ic->ic_curchan) {
ic->ic_curchan = c;
ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
IEEE80211_UNLOCK(ic);
ic->ic_set_channel(ic);
ieee80211_radiotap_chan_change(ic);
IEEE80211_LOCK(ic);
}
}
/*
* Setup the current channel. The request channel may be
* promoted if other vap's are operating with HT20/HT40.
*/
void
ieee80211_setupcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
{
if (ic->ic_htcaps & IEEE80211_HTC_HT) {
int flags = gethtadjustflags(ic);
/*
* Check for channel promotion required to support the
* set of running vap's. This assumes we are called
* after ni_chan is setup for each vap.
*/
/* NB: this assumes IEEE80211_FHT_USEHT40 > IEEE80211_FHT_HT */
if (flags > ieee80211_htchanflags(c))
c = ieee80211_ht_adjust_channel(ic, c, flags);
}
ic->ic_bsschan = ic->ic_curchan = c;
ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
ic->ic_rt = ieee80211_get_ratetable(ic->ic_curchan);
}
/*
* Change the current channel. The channel change is guaranteed to have
* happened before the next state change.
*/
void
ieee80211_setcurchan(struct ieee80211com *ic, struct ieee80211_channel *c)
{
ieee80211_setupcurchan(ic, c);
ieee80211_runtask(ic, &ic->ic_chan_task);
}
void
ieee80211_update_chw(struct ieee80211com *ic)
{
ieee80211_setupcurchan(ic, ic->ic_curchan);
ieee80211_runtask(ic, &ic->ic_chw_task);
}
/*
* Join the specified IBSS/BSS network. The node is assumed to
* be passed in with a held reference.
*/
static int
ieee80211_sta_join1(struct ieee80211_node *selbs)
{
struct ieee80211vap *vap = selbs->ni_vap;
struct ieee80211com *ic = selbs->ni_ic;
struct ieee80211_node *obss;
int canreassoc;
/*
* Committed to selbs, setup state.
*/
obss = vap->iv_bss;
/*
* Check if old+new node have the same address in which
* case we can reassociate when operating in sta mode.
*/
canreassoc = (obss != NULL &&
vap->iv_state == IEEE80211_S_RUN &&
IEEE80211_ADDR_EQ(obss->ni_macaddr, selbs->ni_macaddr));
vap->iv_bss = selbs; /* NB: caller assumed to bump refcnt */
if (obss != NULL) {
copy_bss(selbs, obss);
ieee80211_node_decref(obss); /* iv_bss reference */
ieee80211_free_node(obss); /* station table reference */
obss = NULL; /* NB: guard against later use */
}
/*
* Delete unusable rates; we've already checked
* that the negotiated rate set is acceptable.
*/
ieee80211_fix_rate(vap->iv_bss, &vap->iv_bss->ni_rates,
IEEE80211_F_DODEL | IEEE80211_F_JOIN);
ieee80211_setcurchan(ic, selbs->ni_chan);
/*
* Set the erp state (mostly the slot time) to deal with
* the auto-select case; this should be redundant if the
* mode is locked.
*/
ieee80211_reset_erp(ic);
ieee80211_wme_initparams(vap);
if (vap->iv_opmode == IEEE80211_M_STA) {
if (canreassoc) {
/* Reassociate */
ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
} else {
/*
* Act as if we received a DEAUTH frame in case we
* are invoked from the RUN state. This will cause
* us to try to re-authenticate if we are operating
* as a station.
*/
ieee80211_new_state(vap, IEEE80211_S_AUTH,
IEEE80211_FC0_SUBTYPE_DEAUTH);
}
} else
ieee80211_new_state(vap, IEEE80211_S_RUN, -1);
return 1;
}
int
ieee80211_sta_join(struct ieee80211vap *vap, struct ieee80211_channel *chan,
const struct ieee80211_scan_entry *se)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
ni = ieee80211_alloc_node(&ic->ic_sta, vap, se->se_macaddr);
if (ni == NULL) {
/* XXX msg */
return 0;
}
/*
* Expand scan state into node's format.
* XXX may not need all this stuff
*/
IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid);
ni->ni_esslen = se->se_ssid[1];
memcpy(ni->ni_essid, se->se_ssid+2, ni->ni_esslen);
ni->ni_tstamp.tsf = se->se_tstamp.tsf;
ni->ni_intval = se->se_intval;
ni->ni_capinfo = se->se_capinfo;
ni->ni_chan = chan;
ni->ni_timoff = se->se_timoff;
ni->ni_fhdwell = se->se_fhdwell;
ni->ni_fhindex = se->se_fhindex;
ni->ni_erp = se->se_erp;
IEEE80211_RSSI_LPF(ni->ni_avgrssi, se->se_rssi);
ni->ni_noise = se->se_noise;
if (vap->iv_opmode == IEEE80211_M_STA) {
/* NB: only infrastructure mode requires an associd */
ni->ni_flags |= IEEE80211_NODE_ASSOCID;
}
if (ieee80211_ies_init(&ni->ni_ies, se->se_ies.data, se->se_ies.len)) {
ieee80211_ies_expand(&ni->ni_ies);
#ifdef IEEE80211_SUPPORT_SUPERG
if (ni->ni_ies.ath_ie != NULL)
ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
#endif
if (ni->ni_ies.htcap_ie != NULL)
ieee80211_parse_htcap(ni, ni->ni_ies.htcap_ie);
if (ni->ni_ies.htinfo_ie != NULL)
ieee80211_parse_htinfo(ni, ni->ni_ies.htinfo_ie);
#ifdef IEEE80211_SUPPORT_MESH
if (ni->ni_ies.meshid_ie != NULL)
ieee80211_parse_meshid(ni, ni->ni_ies.meshid_ie);
#endif
#ifdef IEEE80211_SUPPORT_TDMA
if (ni->ni_ies.tdma_ie != NULL)
ieee80211_parse_tdma(ni, ni->ni_ies.tdma_ie);
#endif
}
vap->iv_dtim_period = se->se_dtimperiod;
vap->iv_dtim_count = 0;
/* NB: must be after ni_chan is setup */
ieee80211_setup_rates(ni, se->se_rates, se->se_xrates,
IEEE80211_F_DOSORT);
if (ieee80211_iserp_rateset(&ni->ni_rates))
ni->ni_flags |= IEEE80211_NODE_ERP;
ieee80211_node_setuptxparms(ni);
ieee80211_ratectl_node_init(ni);
return ieee80211_sta_join1(ieee80211_ref_node(ni));
}
/*
* Leave the specified IBSS/BSS network. The node is assumed to
* be passed in with a held reference.
*/
void
ieee80211_sta_leave(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
ic->ic_node_cleanup(ni);
ieee80211_notify_node_leave(ni);
}
/*
* Send a deauthenticate frame and drop the station.
*/
void
ieee80211_node_deauth(struct ieee80211_node *ni, int reason)
{
/* NB: bump the refcnt to be sure temporay nodes are not reclaimed */
ieee80211_ref_node(ni);
if (ni->ni_associd != 0)
IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH, reason);
ieee80211_node_leave(ni);
ieee80211_free_node(ni);
}
static struct ieee80211_node *
node_alloc(struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
{
struct ieee80211_node *ni;
ni = (struct ieee80211_node *) malloc(sizeof(struct ieee80211_node),
M_80211_NODE, M_NOWAIT | M_ZERO);
return ni;
}
/*
* Initialize an ie blob with the specified data. If previous
* data exists re-use the data block. As a side effect we clear
* all references to specific ie's; the caller is required to
* recalculate them.
*/
int
ieee80211_ies_init(struct ieee80211_ies *ies, const uint8_t *data, int len)
{
/* NB: assumes data+len are the last fields */
memset(ies, 0, offsetof(struct ieee80211_ies, data));
if (ies->data != NULL && ies->len != len) {
/* data size changed */
free(ies->data, M_80211_NODE_IE);
ies->data = NULL;
}
if (ies->data == NULL) {
ies->data = (uint8_t *) malloc(len, M_80211_NODE_IE, M_NOWAIT);
if (ies->data == NULL) {
ies->len = 0;
/* NB: pointers have already been zero'd above */
return 0;
}
}
memcpy(ies->data, data, len);
ies->len = len;
return 1;
}
/*
* Reclaim storage for an ie blob.
*/
void
ieee80211_ies_cleanup(struct ieee80211_ies *ies)
{
if (ies->data != NULL)
free(ies->data, M_80211_NODE_IE);
}
/*
* Expand an ie blob data contents and to fillin individual
* ie pointers. The data blob is assumed to be well-formed;
* we don't do any validity checking of ie lengths.
*/
void
ieee80211_ies_expand(struct ieee80211_ies *ies)
{
uint8_t *ie;
int ielen;
ie = ies->data;
ielen = ies->len;
while (ielen > 0) {
switch (ie[0]) {
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(ie))
ies->wpa_ie = ie;
else if (iswmeoui(ie))
ies->wme_ie = ie;
#ifdef IEEE80211_SUPPORT_SUPERG
else if (isatherosoui(ie))
ies->ath_ie = ie;
#endif
#ifdef IEEE80211_SUPPORT_TDMA
else if (istdmaoui(ie))
ies->tdma_ie = ie;
#endif
break;
case IEEE80211_ELEMID_RSN:
ies->rsn_ie = ie;
break;
case IEEE80211_ELEMID_HTCAP:
ies->htcap_ie = ie;
break;
#ifdef IEEE80211_SUPPORT_MESH
case IEEE80211_ELEMID_MESHID:
ies->meshid_ie = ie;
break;
#endif
}
ielen -= 2 + ie[1];
ie += 2 + ie[1];
}
}
/*
* Reclaim any resources in a node and reset any critical
* state. Typically nodes are free'd immediately after,
* but in some cases the storage may be reused so we need
* to insure consistent state (should probably fix that).
*/
static void
node_cleanup(struct ieee80211_node *ni)
{
#define N(a) (sizeof(a)/sizeof(a[0]))
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
int i;
/* NB: preserve ni_table */
if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
if (vap->iv_opmode != IEEE80211_M_STA)
vap->iv_ps_sta--;
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"power save mode off, %u sta's in ps mode", vap->iv_ps_sta);
}
/*
* Cleanup any HT-related state.
*/
if (ni->ni_flags & IEEE80211_NODE_HT)
ieee80211_ht_node_cleanup(ni);
#ifdef IEEE80211_SUPPORT_SUPERG
else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
ieee80211_ff_node_cleanup(ni);
#endif
#ifdef IEEE80211_SUPPORT_MESH
/*
* Cleanup any mesh-related state.
*/
if (vap->iv_opmode == IEEE80211_M_MBSS)
ieee80211_mesh_node_cleanup(ni);
#endif
/*
* Clear any staging queue entries.
*/
ieee80211_ageq_drain_node(&ic->ic_stageq, ni);
/*
* Clear AREF flag that marks the authorization refcnt bump
* has happened. This is probably not needed as the node
* should always be removed from the table so not found but
* do it just in case.
* Likewise clear the ASSOCID flag as these flags are intended
* to be managed in tandem.
*/
ni->ni_flags &= ~(IEEE80211_NODE_AREF | IEEE80211_NODE_ASSOCID);
/*
* Drain power save queue and, if needed, clear TIM.
*/
if (ieee80211_node_psq_drain(ni) != 0 && vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 0);
ni->ni_associd = 0;
if (ni->ni_challenge != NULL) {
free(ni->ni_challenge, M_80211_NODE);
ni->ni_challenge = NULL;
}
/*
* Preserve SSID, WPA, and WME ie's so the bss node is
* reusable during a re-auth/re-assoc state transition.
* If we remove these data they will not be recreated
* because they come from a probe-response or beacon frame
* which cannot be expected prior to the association-response.
* This should not be an issue when operating in other modes
* as stations leaving always go through a full state transition
* which will rebuild this state.
*
* XXX does this leave us open to inheriting old state?
*/
for (i = 0; i < N(ni->ni_rxfrag); i++)
if (ni->ni_rxfrag[i] != NULL) {
m_freem(ni->ni_rxfrag[i]);
ni->ni_rxfrag[i] = NULL;
}
/*
* Must be careful here to remove any key map entry w/o a LOR.
*/
ieee80211_node_delucastkey(ni);
#undef N
}
static void
node_free(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
ieee80211_ratectl_node_deinit(ni);
ic->ic_node_cleanup(ni);
ieee80211_ies_cleanup(&ni->ni_ies);
ieee80211_psq_cleanup(&ni->ni_psq);
free(ni, M_80211_NODE);
}
static void
node_age(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
IEEE80211_NODE_LOCK_ASSERT(&vap->iv_ic->ic_sta);
/*
* Age frames on the power save queue.
*/
if (ieee80211_node_psq_age(ni) != 0 &&
ni->ni_psq.psq_len == 0 && vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 0);
/*
* Age out HT resources (e.g. frames on the
* A-MPDU reorder queues).
*/
if (ni->ni_associd != 0 && (ni->ni_flags & IEEE80211_NODE_HT))
ieee80211_ht_node_age(ni);
}
static int8_t
node_getrssi(const struct ieee80211_node *ni)
{
uint32_t avgrssi = ni->ni_avgrssi;
int32_t rssi;
if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER)
return 0;
rssi = IEEE80211_RSSI_GET(avgrssi);
return rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
}
static void
node_getsignal(const struct ieee80211_node *ni, int8_t *rssi, int8_t *noise)
{
*rssi = node_getrssi(ni);
*noise = ni->ni_noise;
}
static void
node_getmimoinfo(const struct ieee80211_node *ni,
struct ieee80211_mimo_info *info)
{
int i;
uint32_t avgrssi;
int32_t rssi;
bzero(info, sizeof(*info));
for (i = 0; i < ni->ni_mimo_chains; i++) {
avgrssi = ni->ni_mimo_rssi_ctl[i];
if (avgrssi == IEEE80211_RSSI_DUMMY_MARKER) {
info->rssi[i] = 0;
} else {
rssi = IEEE80211_RSSI_GET(avgrssi);
info->rssi[i] = rssi < 0 ? 0 : rssi > 127 ? 127 : rssi;
}
info->noise[i] = ni->ni_mimo_noise_ctl[i];
}
/* XXX ext radios? */
/* XXX EVM? */
}
struct ieee80211_node *
ieee80211_alloc_node(struct ieee80211_node_table *nt,
struct ieee80211vap *vap, const uint8_t macaddr[IEEE80211_ADDR_LEN])
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni;
int hash;
ni = ic->ic_node_alloc(vap, macaddr);
if (ni == NULL) {
vap->iv_stats.is_rx_nodealloc++;
return NULL;
}
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"%s %p<%s> in %s table\n", __func__, ni,
ether_sprintf(macaddr), nt->nt_name);
IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
hash = IEEE80211_NODE_HASH(ic, macaddr);
ieee80211_node_initref(ni); /* mark referenced */
ni->ni_chan = IEEE80211_CHAN_ANYC;
ni->ni_authmode = IEEE80211_AUTH_OPEN;
ni->ni_txpower = ic->ic_txpowlimit; /* max power */
ni->ni_txparms = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
ni->ni_avgrssi = IEEE80211_RSSI_DUMMY_MARKER;
ni->ni_inact_reload = nt->nt_inact_init;
ni->ni_inact = ni->ni_inact_reload;
ni->ni_ath_defkeyix = 0x7fff;
ieee80211_psq_init(&ni->ni_psq, "unknown");
#ifdef IEEE80211_SUPPORT_MESH
if (vap->iv_opmode == IEEE80211_M_MBSS)
ieee80211_mesh_node_init(vap, ni);
#endif
IEEE80211_NODE_LOCK(nt);
TAILQ_INSERT_TAIL(&nt->nt_node, ni, ni_list);
LIST_INSERT_HEAD(&nt->nt_hash[hash], ni, ni_hash);
ni->ni_table = nt;
ni->ni_vap = vap;
ni->ni_ic = ic;
IEEE80211_NODE_UNLOCK(nt);
IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
"%s: inact_reload %u", __func__, ni->ni_inact_reload);
ieee80211_ratectl_node_init(ni);
return ni;
}
/*
* Craft a temporary node suitable for sending a management frame
* to the specified station. We craft only as much state as we
* need to do the work since the node will be immediately reclaimed
* once the send completes.
*/
struct ieee80211_node *
ieee80211_tmp_node(struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN])
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
ni = ic->ic_node_alloc(vap, macaddr);
if (ni != NULL) {
struct ieee80211_node *bss = vap->iv_bss;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
ni->ni_table = NULL; /* NB: pedantic */
ni->ni_ic = ic; /* NB: needed to set channel */
ni->ni_vap = vap;
IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
ieee80211_node_initref(ni); /* mark referenced */
/* NB: required by ieee80211_fix_rate */
ieee80211_node_set_chan(ni, bss->ni_chan);
ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey,
IEEE80211_KEYIX_NONE);
ni->ni_txpower = bss->ni_txpower;
/* XXX optimize away */
ieee80211_psq_init(&ni->ni_psq, "unknown");
ieee80211_ratectl_node_init(ni);
} else {
/* XXX msg */
vap->iv_stats.is_rx_nodealloc++;
}
return ni;
}
struct ieee80211_node *
ieee80211_dup_bss(struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN])
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
ni = ieee80211_alloc_node(&ic->ic_sta, vap, macaddr);
if (ni != NULL) {
struct ieee80211_node *bss = vap->iv_bss;
/*
* Inherit from iv_bss.
*/
copy_bss(ni, bss);
IEEE80211_ADDR_COPY(ni->ni_bssid, bss->ni_bssid);
ieee80211_node_set_chan(ni, bss->ni_chan);
}
return ni;
}
/*
* Create a bss node for a legacy WDS vap. The far end does
* not associate so we just create create a new node and
* simulate an association. The caller is responsible for
* installing the node as the bss node and handling any further
* setup work like authorizing the port.
*/
struct ieee80211_node *
ieee80211_node_create_wds(struct ieee80211vap *vap,
const uint8_t bssid[IEEE80211_ADDR_LEN], struct ieee80211_channel *chan)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
/* XXX check if node already in sta table? */
ni = ieee80211_alloc_node(&ic->ic_sta, vap, bssid);
if (ni != NULL) {
ni->ni_wdsvap = vap;
IEEE80211_ADDR_COPY(ni->ni_bssid, bssid);
/*
* Inherit any manually configured settings.
*/
copy_bss(ni, vap->iv_bss);
ieee80211_node_set_chan(ni, chan);
/* NB: propagate ssid so available to WPA supplicant */
ni->ni_esslen = vap->iv_des_ssid[0].len;
memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
/* NB: no associd for peer */
/*
* There are no management frames to use to
* discover neighbor capabilities, so blindly
* propagate the local configuration.
*/
if (vap->iv_flags & IEEE80211_F_WME)
ni->ni_flags |= IEEE80211_NODE_QOS;
#ifdef IEEE80211_SUPPORT_SUPERG
if (vap->iv_flags & IEEE80211_F_FF)
ni->ni_flags |= IEEE80211_NODE_FF;
#endif
if ((ic->ic_htcaps & IEEE80211_HTC_HT) &&
(vap->iv_flags_ht & IEEE80211_FHT_HT)) {
/*
* Device is HT-capable and HT is enabled for
* the vap; setup HT operation. On return
* ni_chan will be adjusted to an HT channel.
*/
ieee80211_ht_wds_init(ni);
} else {
struct ieee80211_channel *c = ni->ni_chan;
/*
* Force a legacy channel to be used.
*/
c = ieee80211_find_channel(ic,
c->ic_freq, c->ic_flags &~ IEEE80211_CHAN_HT);
KASSERT(c != NULL, ("no legacy channel, %u/%x",
ni->ni_chan->ic_freq, ni->ni_chan->ic_flags));
ni->ni_chan = c;
}
}
return ni;
}
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_node_locked_debug(struct ieee80211_node_table *nt,
const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
#else
ieee80211_find_node_locked(struct ieee80211_node_table *nt,
const uint8_t macaddr[IEEE80211_ADDR_LEN])
#endif
{
struct ieee80211_node *ni;
int hash;
IEEE80211_NODE_LOCK_ASSERT(nt);
hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
ieee80211_ref_node(ni); /* mark referenced */
#ifdef IEEE80211_DEBUG_REFCNT
IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
"%s (%s:%u) %p<%s> refcnt %d\n", __func__,
func, line,
ni, ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni));
#endif
return ni;
}
}
return NULL;
}
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_node_debug(struct ieee80211_node_table *nt,
const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
#else
ieee80211_find_node(struct ieee80211_node_table *nt,
const uint8_t macaddr[IEEE80211_ADDR_LEN])
#endif
{
struct ieee80211_node *ni;
IEEE80211_NODE_LOCK(nt);
ni = ieee80211_find_node_locked(nt, macaddr);
IEEE80211_NODE_UNLOCK(nt);
return ni;
}
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_vap_node_locked_debug(struct ieee80211_node_table *nt,
const struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
#else
ieee80211_find_vap_node_locked(struct ieee80211_node_table *nt,
const struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN])
#endif
{
struct ieee80211_node *ni;
int hash;
IEEE80211_NODE_LOCK_ASSERT(nt);
hash = IEEE80211_NODE_HASH(nt->nt_ic, macaddr);
LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
if (ni->ni_vap == vap &&
IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr)) {
ieee80211_ref_node(ni); /* mark referenced */
#ifdef IEEE80211_DEBUG_REFCNT
IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
"%s (%s:%u) %p<%s> refcnt %d\n", __func__,
func, line,
ni, ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni));
#endif
return ni;
}
}
return NULL;
}
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_vap_node_debug(struct ieee80211_node_table *nt,
const struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN], const char *func, int line)
#else
ieee80211_find_vap_node(struct ieee80211_node_table *nt,
const struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN])
#endif
{
struct ieee80211_node *ni;
IEEE80211_NODE_LOCK(nt);
ni = ieee80211_find_vap_node_locked(nt, vap, macaddr);
IEEE80211_NODE_UNLOCK(nt);
return ni;
}
/*
* Fake up a node; this handles node discovery in adhoc mode.
* Note that for the driver's benefit we we treat this like
* an association so the driver has an opportunity to setup
* it's private state.
*/
struct ieee80211_node *
ieee80211_fakeup_adhoc_node(struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN])
{
struct ieee80211_node *ni;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"%s: mac<%s>\n", __func__, ether_sprintf(macaddr));
ni = ieee80211_dup_bss(vap, macaddr);
if (ni != NULL) {
struct ieee80211com *ic = vap->iv_ic;
/* XXX no rate negotiation; just dup */
ni->ni_rates = vap->iv_bss->ni_rates;
if (ieee80211_iserp_rateset(&ni->ni_rates))
ni->ni_flags |= IEEE80211_NODE_ERP;
if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
/*
* In adhoc demo mode there are no management
* frames to use to discover neighbor capabilities,
* so blindly propagate the local configuration
* so we can do interesting things (e.g. use
* WME to disable ACK's).
*/
if (vap->iv_flags & IEEE80211_F_WME)
ni->ni_flags |= IEEE80211_NODE_QOS;
#ifdef IEEE80211_SUPPORT_SUPERG
if (vap->iv_flags & IEEE80211_F_FF)
ni->ni_flags |= IEEE80211_NODE_FF;
#endif
}
ieee80211_node_setuptxparms(ni);
ieee80211_ratectl_node_init(ni);
if (ic->ic_newassoc != NULL)
ic->ic_newassoc(ni, 1);
/* XXX not right for 802.1x/WPA */
ieee80211_node_authorize(ni);
}
return ni;
}
void
ieee80211_init_neighbor(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const struct ieee80211_scanparams *sp)
{
ni->ni_esslen = sp->ssid[1];
memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
ni->ni_intval = sp->bintval;
ni->ni_capinfo = sp->capinfo;
ni->ni_chan = ni->ni_ic->ic_curchan;
ni->ni_fhdwell = sp->fhdwell;
ni->ni_fhindex = sp->fhindex;
ni->ni_erp = sp->erp;
ni->ni_timoff = sp->timoff;
#ifdef IEEE80211_SUPPORT_MESH
if (ni->ni_vap->iv_opmode == IEEE80211_M_MBSS)
ieee80211_mesh_init_neighbor(ni, wh, sp);
#endif
if (ieee80211_ies_init(&ni->ni_ies, sp->ies, sp->ies_len)) {
ieee80211_ies_expand(&ni->ni_ies);
if (ni->ni_ies.wme_ie != NULL)
ni->ni_flags |= IEEE80211_NODE_QOS;
else
ni->ni_flags &= ~IEEE80211_NODE_QOS;
#ifdef IEEE80211_SUPPORT_SUPERG
if (ni->ni_ies.ath_ie != NULL)
ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
#endif
}
/* NB: must be after ni_chan is setup */
ieee80211_setup_rates(ni, sp->rates, sp->xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
}
/*
* Do node discovery in adhoc mode on receipt of a beacon
* or probe response frame. Note that for the driver's
* benefit we we treat this like an association so the
* driver has an opportunity to setup it's private state.
*/
struct ieee80211_node *
ieee80211_add_neighbor(struct ieee80211vap *vap,
const struct ieee80211_frame *wh,
const struct ieee80211_scanparams *sp)
{
struct ieee80211_node *ni;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2));
ni = ieee80211_dup_bss(vap, wh->i_addr2);/* XXX alloc_node? */
if (ni != NULL) {
struct ieee80211com *ic = vap->iv_ic;
ieee80211_init_neighbor(ni, wh, sp);
if (ieee80211_iserp_rateset(&ni->ni_rates))
ni->ni_flags |= IEEE80211_NODE_ERP;
ieee80211_node_setuptxparms(ni);
ieee80211_ratectl_node_init(ni);
if (ic->ic_newassoc != NULL)
ic->ic_newassoc(ni, 1);
/* XXX not right for 802.1x/WPA */
ieee80211_node_authorize(ni);
}
return ni;
}
#define IS_PROBEREQ(wh) \
((wh->i_fc[0] & (IEEE80211_FC0_TYPE_MASK|IEEE80211_FC0_SUBTYPE_MASK)) \
== (IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ))
#define IS_BCAST_PROBEREQ(wh) \
(IS_PROBEREQ(wh) && IEEE80211_IS_MULTICAST( \
((const struct ieee80211_frame *)(wh))->i_addr3))
static __inline struct ieee80211_node *
_find_rxnode(struct ieee80211_node_table *nt,
const struct ieee80211_frame_min *wh)
{
if (IS_BCAST_PROBEREQ(wh))
return NULL; /* spam bcast probe req to all vap's */
return ieee80211_find_node_locked(nt, wh->i_addr2);
}
/*
* Locate the node for sender, track state, and then pass the
* (referenced) node up to the 802.11 layer for its use. Note
* we can return NULL if the sender is not in the table.
*/
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_rxnode_debug(struct ieee80211com *ic,
const struct ieee80211_frame_min *wh, const char *func, int line)
#else
ieee80211_find_rxnode(struct ieee80211com *ic,
const struct ieee80211_frame_min *wh)
#endif
{
struct ieee80211_node_table *nt;
struct ieee80211_node *ni;
nt = &ic->ic_sta;
IEEE80211_NODE_LOCK(nt);
ni = _find_rxnode(nt, wh);
IEEE80211_NODE_UNLOCK(nt);
return ni;
}
/*
* Like ieee80211_find_rxnode but use the supplied h/w
* key index as a hint to locate the node in the key
* mapping table. If an entry is present at the key
* index we return it; otherwise do a normal lookup and
* update the mapping table if the station has a unicast
* key assigned to it.
*/
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_rxnode_withkey_debug(struct ieee80211com *ic,
const struct ieee80211_frame_min *wh, ieee80211_keyix keyix,
const char *func, int line)
#else
ieee80211_find_rxnode_withkey(struct ieee80211com *ic,
const struct ieee80211_frame_min *wh, ieee80211_keyix keyix)
#endif
{
struct ieee80211_node_table *nt;
struct ieee80211_node *ni;
nt = &ic->ic_sta;
IEEE80211_NODE_LOCK(nt);
if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
ni = nt->nt_keyixmap[keyix];
else
ni = NULL;
if (ni == NULL) {
ni = _find_rxnode(nt, wh);
if (ni != NULL && nt->nt_keyixmap != NULL) {
/*
* If the station has a unicast key cache slot
* assigned update the key->node mapping table.
*/
keyix = ni->ni_ucastkey.wk_rxkeyix;
/* XXX can keyixmap[keyix] != NULL? */
if (keyix < nt->nt_keyixmax &&
nt->nt_keyixmap[keyix] == NULL) {
IEEE80211_DPRINTF(ni->ni_vap,
IEEE80211_MSG_NODE,
"%s: add key map entry %p<%s> refcnt %d\n",
__func__, ni, ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni)+1);
nt->nt_keyixmap[keyix] = ieee80211_ref_node(ni);
}
}
} else {
if (IS_BCAST_PROBEREQ(wh))
ni = NULL; /* spam bcast probe req to all vap's */
else
ieee80211_ref_node(ni);
}
IEEE80211_NODE_UNLOCK(nt);
return ni;
}
#undef IS_BCAST_PROBEREQ
#undef IS_PROBEREQ
/*
* Return a reference to the appropriate node for sending
* a data frame. This handles node discovery in adhoc networks.
*/
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_txnode_debug(struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN],
const char *func, int line)
#else
ieee80211_find_txnode(struct ieee80211vap *vap,
const uint8_t macaddr[IEEE80211_ADDR_LEN])
#endif
{
struct ieee80211_node_table *nt = &vap->iv_ic->ic_sta;
struct ieee80211_node *ni;
/*
* The destination address should be in the node table
* unless this is a multicast/broadcast frame. We can
* also optimize station mode operation, all frames go
* to the bss node.
*/
/* XXX can't hold lock across dup_bss 'cuz of recursive locking */
IEEE80211_NODE_LOCK(nt);
if (vap->iv_opmode == IEEE80211_M_STA ||
vap->iv_opmode == IEEE80211_M_WDS ||
IEEE80211_IS_MULTICAST(macaddr))
ni = ieee80211_ref_node(vap->iv_bss);
else
ni = ieee80211_find_node_locked(nt, macaddr);
IEEE80211_NODE_UNLOCK(nt);
if (ni == NULL) {
if (vap->iv_opmode == IEEE80211_M_IBSS ||
vap->iv_opmode == IEEE80211_M_AHDEMO) {
/*
* In adhoc mode cons up a node for the destination.
* Note that we need an additional reference for the
* caller to be consistent with
* ieee80211_find_node_locked.
*/
ni = ieee80211_fakeup_adhoc_node(vap, macaddr);
if (ni != NULL)
(void) ieee80211_ref_node(ni);
} else {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, macaddr,
"no node, discard frame (%s)", __func__);
vap->iv_stats.is_tx_nonode++;
}
}
return ni;
}
static void
_ieee80211_free_node(struct ieee80211_node *ni)
{
struct ieee80211_node_table *nt = ni->ni_table;
/*
* NB: careful about referencing the vap as it may be
* gone if the last reference was held by a driver.
* We know the com will always be present so it's safe
* to use ni_ic below to reclaim resources.
*/
#if 0
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"%s %p<%s> in %s table\n", __func__, ni,
ether_sprintf(ni->ni_macaddr),
nt != NULL ? nt->nt_name : "<gone>");
#endif
if (ni->ni_associd != 0) {
struct ieee80211vap *vap = ni->ni_vap;
if (vap->iv_aid_bitmap != NULL)
IEEE80211_AID_CLR(vap, ni->ni_associd);
}
if (nt != NULL) {
TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
LIST_REMOVE(ni, ni_hash);
}
ni->ni_ic->ic_node_free(ni);
}
void
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_free_node_debug(struct ieee80211_node *ni, const char *func, int line)
#else
ieee80211_free_node(struct ieee80211_node *ni)
#endif
{
struct ieee80211_node_table *nt = ni->ni_table;
#ifdef IEEE80211_DEBUG_REFCNT
IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
"%s (%s:%u) %p<%s> refcnt %d\n", __func__, func, line, ni,
ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
#endif
if (nt != NULL) {
IEEE80211_NODE_LOCK(nt);
if (ieee80211_node_dectestref(ni)) {
/*
* Last reference, reclaim state.
*/
_ieee80211_free_node(ni);
} else if (ieee80211_node_refcnt(ni) == 1 &&
nt->nt_keyixmap != NULL) {
ieee80211_keyix keyix;
/*
* Check for a last reference in the key mapping table.
*/
keyix = ni->ni_ucastkey.wk_rxkeyix;
if (keyix < nt->nt_keyixmax &&
nt->nt_keyixmap[keyix] == ni) {
IEEE80211_DPRINTF(ni->ni_vap,
IEEE80211_MSG_NODE,
"%s: %p<%s> clear key map entry", __func__,
ni, ether_sprintf(ni->ni_macaddr));
nt->nt_keyixmap[keyix] = NULL;
ieee80211_node_decref(ni); /* XXX needed? */
_ieee80211_free_node(ni);
}
}
IEEE80211_NODE_UNLOCK(nt);
} else {
if (ieee80211_node_dectestref(ni))
_ieee80211_free_node(ni);
}
}
/*
* Reclaim a unicast key and clear any key cache state.
*/
int
ieee80211_node_delucastkey(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_node_table *nt = &ic->ic_sta;
struct ieee80211_node *nikey;
ieee80211_keyix keyix;
int isowned, status;
/*
* NB: We must beware of LOR here; deleting the key
* can cause the crypto layer to block traffic updates
* which can generate a LOR against the node table lock;
* grab it here and stash the key index for our use below.
*
* Must also beware of recursion on the node table lock.
* When called from node_cleanup we may already have
* the node table lock held. Unfortunately there's no
* way to separate out this path so we must do this
* conditionally.
*/
isowned = IEEE80211_NODE_IS_LOCKED(nt);
if (!isowned)
IEEE80211_NODE_LOCK(nt);
nikey = NULL;
status = 1; /* NB: success */
if (ni->ni_ucastkey.wk_keyix != IEEE80211_KEYIX_NONE) {
keyix = ni->ni_ucastkey.wk_rxkeyix;
status = ieee80211_crypto_delkey(ni->ni_vap, &ni->ni_ucastkey);
if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
nikey = nt->nt_keyixmap[keyix];
nt->nt_keyixmap[keyix] = NULL;
}
}
if (!isowned)
IEEE80211_NODE_UNLOCK(nt);
if (nikey != NULL) {
KASSERT(nikey == ni,
("key map out of sync, ni %p nikey %p", ni, nikey));
IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
"%s: delete key map entry %p<%s> refcnt %d\n",
__func__, ni, ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni)-1);
ieee80211_free_node(ni);
}
return status;
}
/*
* Reclaim a node. If this is the last reference count then
* do the normal free work. Otherwise remove it from the node
* table and mark it gone by clearing the back-reference.
*/
static void
node_reclaim(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
{
ieee80211_keyix keyix;
IEEE80211_NODE_LOCK_ASSERT(nt);
IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
"%s: remove %p<%s> from %s table, refcnt %d\n",
__func__, ni, ether_sprintf(ni->ni_macaddr),
nt->nt_name, ieee80211_node_refcnt(ni)-1);
/*
* Clear any entry in the unicast key mapping table.
* We need to do it here so rx lookups don't find it
* in the mapping table even if it's not in the hash
* table. We cannot depend on the mapping table entry
* being cleared because the node may not be free'd.
*/
keyix = ni->ni_ucastkey.wk_rxkeyix;
if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax &&
nt->nt_keyixmap[keyix] == ni) {
IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_NODE,
"%s: %p<%s> clear key map entry %u\n",
__func__, ni, ether_sprintf(ni->ni_macaddr), keyix);
nt->nt_keyixmap[keyix] = NULL;
ieee80211_node_decref(ni); /* NB: don't need free */
}
if (!ieee80211_node_dectestref(ni)) {
/*
* Other references are present, just remove the
* node from the table so it cannot be found. When
* the references are dropped storage will be
* reclaimed.
*/
TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
LIST_REMOVE(ni, ni_hash);
ni->ni_table = NULL; /* clear reference */
} else
_ieee80211_free_node(ni);
}
/*
* Node table support.
*/
static void
ieee80211_node_table_init(struct ieee80211com *ic,
struct ieee80211_node_table *nt,
const char *name, int inact, int keyixmax)
{
struct ifnet *ifp = ic->ic_ifp;
nt->nt_ic = ic;
IEEE80211_NODE_LOCK_INIT(nt, ifp->if_xname);
IEEE80211_NODE_ITERATE_LOCK_INIT(nt, ifp->if_xname);
TAILQ_INIT(&nt->nt_node);
nt->nt_name = name;
nt->nt_scangen = 1;
nt->nt_inact_init = inact;
nt->nt_keyixmax = keyixmax;
if (nt->nt_keyixmax > 0) {
nt->nt_keyixmap = (struct ieee80211_node **) malloc(
keyixmax * sizeof(struct ieee80211_node *),
M_80211_NODE, M_NOWAIT | M_ZERO);
if (nt->nt_keyixmap == NULL)
if_printf(ic->ic_ifp,
"Cannot allocate key index map with %u entries\n",
keyixmax);
} else
nt->nt_keyixmap = NULL;
}
static void
ieee80211_node_table_reset(struct ieee80211_node_table *nt,
struct ieee80211vap *match)
{
struct ieee80211_node *ni, *next;
IEEE80211_NODE_LOCK(nt);
TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next) {
if (match != NULL && ni->ni_vap != match)
continue;
/* XXX can this happen? if so need's work */
if (ni->ni_associd != 0) {
struct ieee80211vap *vap = ni->ni_vap;
if (vap->iv_auth->ia_node_leave != NULL)
vap->iv_auth->ia_node_leave(ni);
if (vap->iv_aid_bitmap != NULL)
IEEE80211_AID_CLR(vap, ni->ni_associd);
}
ni->ni_wdsvap = NULL; /* clear reference */
node_reclaim(nt, ni);
}
if (match != NULL && match->iv_opmode == IEEE80211_M_WDS) {
/*
* Make a separate pass to clear references to this vap
* held by DWDS entries. They will not be matched above
* because ni_vap will point to the ap vap but we still
* need to clear ni_wdsvap when the WDS vap is destroyed
* and/or reset.
*/
TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next)
if (ni->ni_wdsvap == match)
ni->ni_wdsvap = NULL;
}
IEEE80211_NODE_UNLOCK(nt);
}
static void
ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
{
ieee80211_node_table_reset(nt, NULL);
if (nt->nt_keyixmap != NULL) {
#ifdef DIAGNOSTIC
/* XXX verify all entries are NULL */
int i;
for (i = 0; i < nt->nt_keyixmax; i++)
if (nt->nt_keyixmap[i] != NULL)
printf("%s: %s[%u] still active\n", __func__,
nt->nt_name, i);
#endif
free(nt->nt_keyixmap, M_80211_NODE);
nt->nt_keyixmap = NULL;
}
IEEE80211_NODE_ITERATE_LOCK_DESTROY(nt);
IEEE80211_NODE_LOCK_DESTROY(nt);
}
/*
* Timeout inactive stations and do related housekeeping.
* Note that we cannot hold the node lock while sending a
* frame as this would lead to a LOR. Instead we use a
* generation number to mark nodes that we've scanned and
* drop the lock and restart a scan if we have to time out
* a node. Since we are single-threaded by virtue of
* controlling the inactivity timer we can be sure this will
* process each node only once.
*/
static void
ieee80211_timeout_stations(struct ieee80211com *ic)
{
struct ieee80211_node_table *nt = &ic->ic_sta;
struct ieee80211vap *vap;
struct ieee80211_node *ni;
int gen = 0;
IEEE80211_NODE_ITERATE_LOCK(nt);
gen = ++nt->nt_scangen;
restart:
IEEE80211_NODE_LOCK(nt);
TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
if (ni->ni_scangen == gen) /* previously handled */
continue;
ni->ni_scangen = gen;
/*
* Ignore entries for which have yet to receive an
* authentication frame. These are transient and
* will be reclaimed when the last reference to them
* goes away (when frame xmits complete).
*/
vap = ni->ni_vap;
/*
* Only process stations when in RUN state. This
* insures, for example, that we don't timeout an
* inactive station during CAC. Note that CSA state
* is actually handled in ieee80211_node_timeout as
* it applies to more than timeout processing.
*/
if (vap->iv_state != IEEE80211_S_RUN)
continue;
/* XXX can vap be NULL? */
if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
vap->iv_opmode == IEEE80211_M_STA) &&
(ni->ni_flags & IEEE80211_NODE_AREF) == 0)
continue;
/*
* Free fragment if not needed anymore
* (last fragment older than 1s).
* XXX doesn't belong here, move to node_age
*/
if (ni->ni_rxfrag[0] != NULL &&
ticks > ni->ni_rxfragstamp + hz) {
m_freem(ni->ni_rxfrag[0]);
ni->ni_rxfrag[0] = NULL;
}
if (ni->ni_inact > 0) {
ni->ni_inact--;
IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
"%s: inact %u inact_reload %u nrates %u",
__func__, ni->ni_inact, ni->ni_inact_reload,
ni->ni_rates.rs_nrates);
}
/*
* Special case ourself; we may be idle for extended periods
* of time and regardless reclaiming our state is wrong.
* XXX run ic_node_age
*/
if (ni == vap->iv_bss)
continue;
if (ni->ni_associd != 0 ||
(vap->iv_opmode == IEEE80211_M_IBSS ||
vap->iv_opmode == IEEE80211_M_AHDEMO)) {
/*
* Age/drain resources held by the station.
*/
ic->ic_node_age(ni);
/*
* Probe the station before time it out. We
* send a null data frame which may not be
* universally supported by drivers (need it
* for ps-poll support so it should be...).
*
* XXX don't probe the station unless we've
* received a frame from them (and have
* some idea of the rates they are capable
* of); this will get fixed more properly
* soon with better handling of the rate set.
*/
if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
(0 < ni->ni_inact &&
ni->ni_inact <= vap->iv_inact_probe) &&
ni->ni_rates.rs_nrates != 0) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
ni, "%s",
"probe station due to inactivity");
/*
* Grab a reference before unlocking the table
* so the node cannot be reclaimed before we
* send the frame. ieee80211_send_nulldata
* understands we've done this and reclaims the
* ref for us as needed.
*/
ieee80211_ref_node(ni);
IEEE80211_NODE_UNLOCK(nt);
ieee80211_send_nulldata(ni);
/* XXX stat? */
goto restart;
}
}
if ((vap->iv_flags_ext & IEEE80211_FEXT_INACT) &&
ni->ni_inact <= 0) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
"station timed out due to inactivity "
"(refcnt %u)", ieee80211_node_refcnt(ni));
/*
* Send a deauthenticate frame and drop the station.
* This is somewhat complicated due to reference counts
* and locking. At this point a station will typically
* have a reference count of 1. ieee80211_node_leave
* will do a "free" of the node which will drop the
* reference count. But in the meantime a reference
* wil be held by the deauth frame. The actual reclaim
* of the node will happen either after the tx is
* completed or by ieee80211_node_leave.
*
* Separately we must drop the node lock before sending
* in case the driver takes a lock, as this can result
* in a LOR between the node lock and the driver lock.
*/
ieee80211_ref_node(ni);
IEEE80211_NODE_UNLOCK(nt);
if (ni->ni_associd != 0) {
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_EXPIRE);
}
ieee80211_node_leave(ni);
ieee80211_free_node(ni);
vap->iv_stats.is_node_timeout++;
goto restart;
}
}
IEEE80211_NODE_UNLOCK(nt);
IEEE80211_NODE_ITERATE_UNLOCK(nt);
}
/*
* Aggressively reclaim resources. This should be used
* only in a critical situation to reclaim mbuf resources.
*/
void
ieee80211_drain(struct ieee80211com *ic)
{
struct ieee80211_node_table *nt = &ic->ic_sta;
struct ieee80211vap *vap;
struct ieee80211_node *ni;
IEEE80211_NODE_LOCK(nt);
TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
/*
* Ignore entries for which have yet to receive an
* authentication frame. These are transient and
* will be reclaimed when the last reference to them
* goes away (when frame xmits complete).
*/
vap = ni->ni_vap;
/*
* Only process stations when in RUN state. This
* insures, for example, that we don't timeout an
* inactive station during CAC. Note that CSA state
* is actually handled in ieee80211_node_timeout as
* it applies to more than timeout processing.
*/
if (vap->iv_state != IEEE80211_S_RUN)
continue;
/* XXX can vap be NULL? */
if ((vap->iv_opmode == IEEE80211_M_HOSTAP ||
vap->iv_opmode == IEEE80211_M_STA) &&
(ni->ni_flags & IEEE80211_NODE_AREF) == 0)
continue;
/*
* Free fragments.
* XXX doesn't belong here, move to node_drain
*/
if (ni->ni_rxfrag[0] != NULL) {
m_freem(ni->ni_rxfrag[0]);
ni->ni_rxfrag[0] = NULL;
}
/*
* Drain resources held by the station.
*/
ic->ic_node_drain(ni);
}
IEEE80211_NODE_UNLOCK(nt);
}
/*
* Per-ieee80211com inactivity timer callback.
*/
void
ieee80211_node_timeout(void *arg)
{
struct ieee80211com *ic = arg;
/*
* Defer timeout processing if a channel switch is pending.
* We typically need to be mute so not doing things that
* might generate frames is good to handle in one place.
* Supressing the station timeout processing may extend the
* lifetime of inactive stations (by not decrementing their
* idle counters) but this should be ok unless the CSA is
* active for an unusually long time.
*/
if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
ieee80211_scan_timeout(ic);
ieee80211_timeout_stations(ic);
ieee80211_ageq_age(&ic->ic_stageq, IEEE80211_INACT_WAIT);
IEEE80211_LOCK(ic);
ieee80211_erp_timeout(ic);
ieee80211_ht_timeout(ic);
IEEE80211_UNLOCK(ic);
}
callout_reset(&ic->ic_inact, IEEE80211_INACT_WAIT*hz,
ieee80211_node_timeout, ic);
}
void
ieee80211_iterate_nodes(struct ieee80211_node_table *nt,
ieee80211_iter_func *f, void *arg)
{
struct ieee80211_node *ni;
u_int gen;
IEEE80211_NODE_ITERATE_LOCK(nt);
gen = ++nt->nt_scangen;
restart:
IEEE80211_NODE_LOCK(nt);
TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
if (ni->ni_scangen != gen) {
ni->ni_scangen = gen;
(void) ieee80211_ref_node(ni);
IEEE80211_NODE_UNLOCK(nt);
(*f)(arg, ni);
ieee80211_free_node(ni);
goto restart;
}
}
IEEE80211_NODE_UNLOCK(nt);
IEEE80211_NODE_ITERATE_UNLOCK(nt);
}
void
ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
{
printf("0x%p: mac %s refcnt %d\n", ni,
ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni));
printf("\tscangen %u authmode %u flags 0x%x\n",
ni->ni_scangen, ni->ni_authmode, ni->ni_flags);
printf("\tassocid 0x%x txpower %u vlan %u\n",
ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
printf("\ttxseq %u rxseq %u fragno %u rxfragstamp %u\n",
ni->ni_txseqs[IEEE80211_NONQOS_TID],
ni->ni_rxseqs[IEEE80211_NONQOS_TID] >> IEEE80211_SEQ_SEQ_SHIFT,
ni->ni_rxseqs[IEEE80211_NONQOS_TID] & IEEE80211_SEQ_FRAG_MASK,
ni->ni_rxfragstamp);
printf("\trssi %d noise %d intval %u capinfo 0x%x\n",
node_getrssi(ni), ni->ni_noise,
ni->ni_intval, ni->ni_capinfo);
printf("\tbssid %s essid \"%.*s\" channel %u:0x%x\n",
ether_sprintf(ni->ni_bssid),
ni->ni_esslen, ni->ni_essid,
ni->ni_chan->ic_freq, ni->ni_chan->ic_flags);
printf("\tinact %u inact_reload %u txrate %u\n",
ni->ni_inact, ni->ni_inact_reload, ni->ni_txrate);
printf("\thtcap %x htparam %x htctlchan %u ht2ndchan %u\n",
ni->ni_htcap, ni->ni_htparam,
ni->ni_htctlchan, ni->ni_ht2ndchan);
printf("\thtopmode %x htstbc %x chw %u\n",
ni->ni_htopmode, ni->ni_htstbc, ni->ni_chw);
}
void
ieee80211_dump_nodes(struct ieee80211_node_table *nt)
{
ieee80211_iterate_nodes(nt,
(ieee80211_iter_func *) ieee80211_dump_node, nt);
}
static void
ieee80211_notify_erp_locked(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
IEEE80211_LOCK_ASSERT(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_opmode == IEEE80211_M_HOSTAP)
ieee80211_beacon_notify(vap, IEEE80211_BEACON_ERP);
}
void
ieee80211_notify_erp(struct ieee80211com *ic)
{
IEEE80211_LOCK(ic);
ieee80211_notify_erp_locked(ic);
IEEE80211_UNLOCK(ic);
}
/*
* Handle a station joining an 11g network.
*/
static void
ieee80211_node_join_11g(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_LOCK_ASSERT(ic);
/*
* Station isn't capable of short slot time. Bump
* the count of long slot time stations and disable
* use of short slot time. Note that the actual switch
* over to long slot time use may not occur until the
* next beacon transmission (per sec. 7.3.1.4 of 11g).
*/
if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
ic->ic_longslotsta++;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
"station needs long slot time, count %d",
ic->ic_longslotsta);
/* XXX vap's w/ conflicting needs won't work */
if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) {
/*
* Don't force slot time when switched to turbo
* mode as non-ERP stations won't be present; this
* need only be done when on the normal G channel.
*/
ieee80211_set_shortslottime(ic, 0);
}
}
/*
* If the new station is not an ERP station
* then bump the counter and enable protection
* if configured.
*/
if (!ieee80211_iserp_rateset(&ni->ni_rates)) {
ic->ic_nonerpsta++;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
"station is !ERP, %d non-ERP stations associated",
ic->ic_nonerpsta);
/*
* If station does not support short preamble
* then we must enable use of Barker preamble.
*/
if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) == 0) {
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
"%s", "station needs long preamble");
ic->ic_flags |= IEEE80211_F_USEBARKER;
ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
}
/*
* If protection is configured and this is the first
* indication we should use protection, enable it.
*/
if (ic->ic_protmode != IEEE80211_PROT_NONE &&
ic->ic_nonerpsta == 1 &&
(ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
"%s: enable use of protection\n", __func__);
ic->ic_flags |= IEEE80211_F_USEPROT;
ieee80211_notify_erp_locked(ic);
}
} else
ni->ni_flags |= IEEE80211_NODE_ERP;
}
void
ieee80211_node_join(struct ieee80211_node *ni, int resp)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
int newassoc;
if (ni->ni_associd == 0) {
uint16_t aid;
KASSERT(vap->iv_aid_bitmap != NULL, ("no aid bitmap"));
/*
* It would be good to search the bitmap
* more efficiently, but this will do for now.
*/
for (aid = 1; aid < vap->iv_max_aid; aid++) {
if (!IEEE80211_AID_ISSET(vap, aid))
break;
}
if (aid >= vap->iv_max_aid) {
IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_TOOMANY);
ieee80211_node_leave(ni);
return;
}
ni->ni_associd = aid | 0xc000;
ni->ni_jointime = time_uptime;
IEEE80211_LOCK(ic);
IEEE80211_AID_SET(vap, ni->ni_associd);
vap->iv_sta_assoc++;
ic->ic_sta_assoc++;
if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
ieee80211_ht_node_join(ni);
if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
ieee80211_node_join_11g(ni);
IEEE80211_UNLOCK(ic);
newassoc = 1;
} else
newassoc = 0;
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
"station associated at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
IEEE80211_NODE_AID(ni),
ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "",
ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
ni->ni_flags & IEEE80211_NODE_HT ?
(ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
", fast-frames" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
", turbo" : ""
);
ieee80211_node_setuptxparms(ni);
ieee80211_ratectl_node_init(ni);
/* give driver a chance to setup state like ni_txrate */
if (ic->ic_newassoc != NULL)
ic->ic_newassoc(ni, newassoc);
IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_SUCCESS);
/* tell the authenticator about new station */
if (vap->iv_auth->ia_node_join != NULL)
vap->iv_auth->ia_node_join(ni);
ieee80211_notify_node_join(ni,
resp == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
}
static void
disable_protection(struct ieee80211com *ic)
{
KASSERT(ic->ic_nonerpsta == 0 &&
(ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0,
("%d non ERP stations, flags 0x%x", ic->ic_nonerpsta,
ic->ic_flags_ext));
ic->ic_flags &= ~IEEE80211_F_USEPROT;
/* XXX verify mode? */
if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
ic->ic_flags &= ~IEEE80211_F_USEBARKER;
}
ieee80211_notify_erp_locked(ic);
}
/*
* Handle a station leaving an 11g network.
*/
static void
ieee80211_node_leave_11g(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_LOCK_ASSERT(ic);
KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
("not in 11g, bss %u:0x%x", ic->ic_bsschan->ic_freq,
ic->ic_bsschan->ic_flags));
/*
* If a long slot station do the slot time bookkeeping.
*/
if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
KASSERT(ic->ic_longslotsta > 0,
("bogus long slot station count %d", ic->ic_longslotsta));
ic->ic_longslotsta--;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
"long slot time station leaves, count now %d",
ic->ic_longslotsta);
if (ic->ic_longslotsta == 0) {
/*
* Re-enable use of short slot time if supported
* and not operating in IBSS mode (per spec).
*/
if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
ic->ic_opmode != IEEE80211_M_IBSS) {
IEEE80211_DPRINTF(ni->ni_vap,
IEEE80211_MSG_ASSOC,
"%s: re-enable use of short slot time\n",
__func__);
ieee80211_set_shortslottime(ic, 1);
}
}
}
/*
* If a non-ERP station do the protection-related bookkeeping.
*/
if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
KASSERT(ic->ic_nonerpsta > 0,
("bogus non-ERP station count %d", ic->ic_nonerpsta));
ic->ic_nonerpsta--;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_ASSOC, ni,
"non-ERP station leaves, count now %d%s", ic->ic_nonerpsta,
(ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) ?
" (non-ERP sta present)" : "");
if (ic->ic_nonerpsta == 0 &&
(ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) == 0) {
IEEE80211_DPRINTF(ni->ni_vap, IEEE80211_MSG_ASSOC,
"%s: disable use of protection\n", __func__);
disable_protection(ic);
}
}
}
/*
* Time out presence of an overlapping bss with non-ERP
* stations. When operating in hostap mode we listen for
* beacons from other stations and if we identify a non-ERP
* station is present we enable protection. To identify
* when all non-ERP stations are gone we time out this
* condition.
*/
static void
ieee80211_erp_timeout(struct ieee80211com *ic)
{
IEEE80211_LOCK_ASSERT(ic);
if ((ic->ic_flags_ext & IEEE80211_FEXT_NONERP_PR) &&
time_after(ticks, ic->ic_lastnonerp + IEEE80211_NONERP_PRESENT_AGE)) {
#if 0
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
"%s", "age out non-ERP sta present on channel");
#endif
ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
if (ic->ic_nonerpsta == 0)
disable_protection(ic);
}
}
/*
* Handle bookkeeping for station deauthentication/disassociation
* when operating as an ap.
*/
void
ieee80211_node_leave(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_node_table *nt = ni->ni_table;
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
"station with aid %d leaves", IEEE80211_NODE_AID(ni));
KASSERT(vap->iv_opmode != IEEE80211_M_STA,
("unexpected operating mode %u", vap->iv_opmode));
/*
* If node wasn't previously associated all
* we need to do is reclaim the reference.
*/
/* XXX ibss mode bypasses 11g and notification */
if (ni->ni_associd == 0)
goto done;
/*
* Tell the authenticator the station is leaving.
* Note that we must do this before yanking the
* association id as the authenticator uses the
* associd to locate it's state block.
*/
if (vap->iv_auth->ia_node_leave != NULL)
vap->iv_auth->ia_node_leave(ni);
IEEE80211_LOCK(ic);
IEEE80211_AID_CLR(vap, ni->ni_associd);
ni->ni_associd = 0;
vap->iv_sta_assoc--;
ic->ic_sta_assoc--;
if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan))
ieee80211_ht_node_leave(ni);
if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
IEEE80211_IS_CHAN_FULL(ic->ic_bsschan))
ieee80211_node_leave_11g(ni);
IEEE80211_UNLOCK(ic);
/*
* Cleanup station state. In particular clear various
* state that might otherwise be reused if the node
* is reused before the reference count goes to zero
* (and memory is reclaimed).
*/
ieee80211_sta_leave(ni);
done:
/*
* Remove the node from any table it's recorded in and
* drop the caller's reference. Removal from the table
* is important to insure the node is not reprocessed
* for inactivity.
*/
if (nt != NULL) {
IEEE80211_NODE_LOCK(nt);
node_reclaim(nt, ni);
IEEE80211_NODE_UNLOCK(nt);
} else
ieee80211_free_node(ni);
}
struct rssiinfo {
struct ieee80211vap *vap;
int rssi_samples;
uint32_t rssi_total;
};
static void
get_hostap_rssi(void *arg, struct ieee80211_node *ni)
{
struct rssiinfo *info = arg;
struct ieee80211vap *vap = ni->ni_vap;
int8_t rssi;
if (info->vap != vap)
return;
/* only associated stations */
if (ni->ni_associd == 0)
return;
rssi = vap->iv_ic->ic_node_getrssi(ni);
if (rssi != 0) {
info->rssi_samples++;
info->rssi_total += rssi;
}
}
static void
get_adhoc_rssi(void *arg, struct ieee80211_node *ni)
{
struct rssiinfo *info = arg;
struct ieee80211vap *vap = ni->ni_vap;
int8_t rssi;
if (info->vap != vap)
return;
/* only neighbors */
/* XXX check bssid */
if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
return;
rssi = vap->iv_ic->ic_node_getrssi(ni);
if (rssi != 0) {
info->rssi_samples++;
info->rssi_total += rssi;
}
}
#ifdef IEEE80211_SUPPORT_MESH
static void
get_mesh_rssi(void *arg, struct ieee80211_node *ni)
{
struct rssiinfo *info = arg;
struct ieee80211vap *vap = ni->ni_vap;
int8_t rssi;
if (info->vap != vap)
return;
/* only neighbors that peered successfully */
if (ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
return;
rssi = vap->iv_ic->ic_node_getrssi(ni);
if (rssi != 0) {
info->rssi_samples++;
info->rssi_total += rssi;
}
}
#endif /* IEEE80211_SUPPORT_MESH */
int8_t
ieee80211_getrssi(struct ieee80211vap *vap)
{
#define NZ(x) ((x) == 0 ? 1 : (x))
struct ieee80211com *ic = vap->iv_ic;
struct rssiinfo info;
info.rssi_total = 0;
info.rssi_samples = 0;
info.vap = vap;
switch (vap->iv_opmode) {
case IEEE80211_M_IBSS: /* average of all ibss neighbors */
case IEEE80211_M_AHDEMO: /* average of all neighbors */
ieee80211_iterate_nodes(&ic->ic_sta, get_adhoc_rssi, &info);
break;
case IEEE80211_M_HOSTAP: /* average of all associated stations */
ieee80211_iterate_nodes(&ic->ic_sta, get_hostap_rssi, &info);
break;
#ifdef IEEE80211_SUPPORT_MESH
case IEEE80211_M_MBSS: /* average of all mesh neighbors */
ieee80211_iterate_nodes(&ic->ic_sta, get_mesh_rssi, &info);
break;
#endif
case IEEE80211_M_MONITOR: /* XXX */
case IEEE80211_M_STA: /* use stats from associated ap */
default:
if (vap->iv_bss != NULL)
info.rssi_total = ic->ic_node_getrssi(vap->iv_bss);
info.rssi_samples = 1;
break;
}
return info.rssi_total / NZ(info.rssi_samples);
#undef NZ
}
void
ieee80211_getsignal(struct ieee80211vap *vap, int8_t *rssi, int8_t *noise)
{
if (vap->iv_bss == NULL) /* NB: shouldn't happen */
return;
vap->iv_ic->ic_node_getsignal(vap->iv_bss, rssi, noise);
/* for non-station mode return avg'd rssi accounting */
if (vap->iv_opmode != IEEE80211_M_STA)
*rssi = ieee80211_getrssi(vap);
}
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