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061dd4dce8
freebsd-skq/sys/net80211/ieee80211_node.c
sam 8af7e8df05 Correct scan candidate selection logic for dual-band devices: prefer 
candidate on 5Ghz channel to candidate on 2Ghz channel only when the
rssi are comparable (wasn't considering rssi).
2005-01-01 17:48:27 +00:00

1913 lines
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/*-
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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 <net/bpf.h>
static struct ieee80211_node *node_alloc(struct ieee80211_node_table *);
static void node_cleanup(struct ieee80211_node *);
static void node_free(struct ieee80211_node *);
static u_int8_t node_getrssi(const struct ieee80211_node *);
static void ieee80211_setup_node(struct ieee80211_node_table *,
struct ieee80211_node *, const u_int8_t *);
static void _ieee80211_free_node(struct ieee80211_node *);
static void ieee80211_free_allnodes(struct ieee80211_node_table *);
static void ieee80211_timeout_scan_candidates(struct ieee80211_node_table *);
static void ieee80211_timeout_stations(struct ieee80211_node_table *);
static void ieee80211_set_tim(struct ieee80211com *,
struct ieee80211_node *, int set);
static void ieee80211_node_table_init(struct ieee80211com *ic,
struct ieee80211_node_table *nt, const char *name, int inact,
void (*timeout)(struct ieee80211_node_table *));
static struct ieee80211_node_table *ieee80211_node_table_alloc(
struct ieee80211com *ic, const char *name, int inact,
void (*timeout)(struct ieee80211_node_table *));
static void ieee80211_node_table_cleanup(struct ieee80211_node_table *nt);
MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state");
void
ieee80211_node_attach(struct ieee80211com *ic)
{
ic->ic_sta = NULL; /* defer to when we need it */
ieee80211_node_table_init(ic, &ic->ic_scan, "scan",
IEEE80211_INACT_SCAN, ieee80211_timeout_scan_candidates);
ic->ic_node_alloc = node_alloc;
ic->ic_node_free = node_free;
ic->ic_node_cleanup = node_cleanup;
ic->ic_node_getrssi = node_getrssi;
/* default station inactivity timer setings */
ic->ic_inact_init = IEEE80211_INACT_INIT;
ic->ic_inact_auth = IEEE80211_INACT_AUTH;
ic->ic_inact_run = IEEE80211_INACT_RUN;
ic->ic_inact_probe = IEEE80211_INACT_PROBE;
/* XXX defer */
if (ic->ic_max_aid == 0)
ic->ic_max_aid = IEEE80211_AID_DEF;
else if (ic->ic_max_aid > IEEE80211_AID_MAX)
ic->ic_max_aid = IEEE80211_AID_MAX;
MALLOC(ic->ic_aid_bitmap, u_int32_t *,
howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t),
M_DEVBUF, M_NOWAIT | M_ZERO);
if (ic->ic_aid_bitmap == NULL) {
/* XXX no way to recover */
printf("%s: no memory for AID bitmap!\n", __func__);
ic->ic_max_aid = 0;
}
/* XXX defer until using hostap/ibss mode */
ic->ic_tim_len = howmany(ic->ic_max_aid, 8) * sizeof(u_int8_t);
MALLOC(ic->ic_tim_bitmap, u_int8_t *, ic->ic_tim_len,
M_DEVBUF, M_NOWAIT | M_ZERO);
if (ic->ic_tim_bitmap == NULL) {
/* XXX no way to recover */
printf("%s: no memory for TIM bitmap!\n", __func__);
}
ic->ic_set_tim = ieee80211_set_tim; /* NB: driver should override */
}
void
ieee80211_node_lateattach(struct ieee80211com *ic)
{
struct ieee80211_node *ni;
struct ieee80211_rsnparms *rsn;
ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr);
KASSERT(ni != NULL, ("unable to setup inital BSS node"));
/*
* Setup "global settings" in the bss node so that
* each new station automatically inherits them.
*/
rsn = &ni->ni_rsn;
/* WEP, TKIP, and AES-CCM are always supported */
rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_WEP;
rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_TKIP;
rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_CCM;
if (ic->ic_caps & IEEE80211_C_AES)
rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_AES_OCB;
if (ic->ic_caps & IEEE80211_C_CKIP)
rsn->rsn_ucastcipherset |= 1<<IEEE80211_CIPHER_CKIP;
/*
* Default unicast cipher to WEP for 802.1x use. If
* WPA is enabled the management code will set these
* values to reflect.
*/
rsn->rsn_ucastcipher = IEEE80211_CIPHER_WEP;
rsn->rsn_ucastkeylen = 104 / NBBY;
/*
* WPA says the multicast cipher is the lowest unicast
* cipher supported. But we skip WEP which would
* otherwise be used based on this criteria.
*/
rsn->rsn_mcastcipher = IEEE80211_CIPHER_TKIP;
rsn->rsn_mcastkeylen = 128 / NBBY;
/*
* We support both WPA-PSK and 802.1x; the one used
* is determined by the authentication mode and the
* setting of the PSK state.
*/
rsn->rsn_keymgmtset = WPA_ASE_8021X_UNSPEC | WPA_ASE_8021X_PSK;
rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
ic->ic_bss = ieee80211_ref_node(ni); /* hold reference */
ic->ic_auth = ieee80211_authenticator_get(ni->ni_authmode);
}
void
ieee80211_node_detach(struct ieee80211com *ic)
{
if (ic->ic_bss != NULL) {
ieee80211_free_node(ic->ic_bss);
ic->ic_bss = NULL;
}
ieee80211_node_table_cleanup(&ic->ic_scan);
if (ic->ic_sta != NULL) {
ieee80211_node_table_free(ic->ic_sta);
ic->ic_sta = NULL;
}
if (ic->ic_aid_bitmap != NULL) {
FREE(ic->ic_aid_bitmap, M_DEVBUF);
ic->ic_aid_bitmap = NULL;
}
if (ic->ic_tim_bitmap != NULL) {
FREE(ic->ic_tim_bitmap, M_DEVBUF);
ic->ic_tim_bitmap = NULL;
}
}
/*
* Port authorize/unauthorize interfaces for use by an authenticator.
*/
void
ieee80211_node_authorize(struct ieee80211com *ic, struct ieee80211_node *ni)
{
ni->ni_flags |= IEEE80211_NODE_AUTH;
ni->ni_inact_reload = ic->ic_inact_run;
}
void
ieee80211_node_unauthorize(struct ieee80211com *ic, struct ieee80211_node *ni)
{
ni->ni_flags &= ~IEEE80211_NODE_AUTH;
}
/*
* Set/change the channel. The rate set is also updated as
* to insure a consistent view by drivers.
*/
static __inline void
ieee80211_set_chan(struct ieee80211com *ic,
struct ieee80211_node *ni, struct ieee80211_channel *chan)
{
ni->ni_chan = chan;
ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, chan)];
}
/*
* AP scanning support.
*/
#ifdef IEEE80211_DEBUG
static void
dump_chanlist(const u_char chans[])
{
const char *sep;
int i;
sep = " ";
for (i = 0; i < IEEE80211_CHAN_MAX; i++)
if (isset(chans, i)) {
printf("%s%u", sep, i);
sep = ", ";
}
}
#endif /* IEEE80211_DEBUG */
/*
* Initialize the channel set to scan based on the
* of available channels and the current PHY mode.
*/
static void
ieee80211_reset_scan(struct ieee80211com *ic)
{
/* XXX ic_des_chan should be handled with ic_chan_active */
if (ic->ic_des_chan != IEEE80211_CHAN_ANYC) {
memset(ic->ic_chan_scan, 0, sizeof(ic->ic_chan_scan));
setbit(ic->ic_chan_scan,
ieee80211_chan2ieee(ic, ic->ic_des_chan));
} else
memcpy(ic->ic_chan_scan, ic->ic_chan_active,
sizeof(ic->ic_chan_active));
/* NB: hack, setup so next_scan starts with the first channel */
if (ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC)
ieee80211_set_chan(ic, ic->ic_bss,
&ic->ic_channels[IEEE80211_CHAN_MAX]);
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(ic)) {
printf("%s: scan set:", __func__);
dump_chanlist(ic->ic_chan_scan);
printf(" start chan %u\n",
ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan));
}
#endif /* IEEE80211_DEBUG */
}
/*
* Begin an active scan.
*/
void
ieee80211_begin_scan(struct ieee80211com *ic, int reset)
{
ic->ic_scan.nt_scangen++;
/*
* In all but hostap mode scanning starts off in
* an active mode before switching to passive.
*/
if (ic->ic_opmode != IEEE80211_M_HOSTAP) {
ic->ic_flags |= IEEE80211_F_ASCAN;
ic->ic_stats.is_scan_active++;
} else
ic->ic_stats.is_scan_passive++;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
"begin %s scan in %s mode, scangen %u\n",
(ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive",
ieee80211_phymode_name[ic->ic_curmode], ic->ic_scan.nt_scangen);
/*
* Clear scan state and flush any previously seen AP's.
*/
ieee80211_reset_scan(ic);
if (reset)
ieee80211_free_allnodes(&ic->ic_scan);
ic->ic_flags |= IEEE80211_F_SCAN;
/* Scan the next channel. */
ieee80211_next_scan(ic);
}
/*
* Switch to the next channel marked for scanning.
*/
int
ieee80211_next_scan(struct ieee80211com *ic)
{
struct ieee80211_channel *chan;
/*
* Insure any previous mgt frame timeouts don't fire.
* This assumes the driver does the right thing in
* flushing anything queued in the driver and below.
*/
ic->ic_mgt_timer = 0;
chan = ic->ic_bss->ni_chan;
do {
if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX])
chan = &ic->ic_channels[0];
if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) {
clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan));
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
"%s: chan %d->%d\n", __func__,
ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan),
ieee80211_chan2ieee(ic, chan));
ieee80211_set_chan(ic, ic->ic_bss, chan);
#ifdef notyet
/* XXX driver state change */
/*
* Scan next channel. If doing an active scan
* and the channel is not marked passive-only
* then send a probe request. Otherwise just
* listen for beacons on the channel.
*/
if ((ic->ic_flags & IEEE80211_F_ASCAN) &&
(ni->ni_chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_PROBE_REQ, 0);
}
#else
ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
#endif
return 1;
}
} while (chan != ic->ic_bss->ni_chan);
ieee80211_end_scan(ic);
return 0;
}
void
ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan)
{
struct ieee80211_node *ni;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
"%s: creating ibss\n", __func__);
/*
* Create the station/neighbor table. Note that for adhoc
* mode we make the initial inactivity timer longer since
* we create nodes only through discovery and they typically
* are long-lived associations.
*/
if (ic->ic_opmode == IEEE80211_M_HOSTAP)
ic->ic_sta = ieee80211_node_table_alloc(ic,
"station", ic->ic_inact_init,
ieee80211_timeout_stations);
else
ic->ic_sta = ieee80211_node_table_alloc(ic,
"neighbor", ic->ic_inact_run,
ieee80211_timeout_stations);
if (ic->ic_sta == NULL) {
/*
* Should remain in SCAN state and retry.
*/
/* XXX stat+msg */
return;
}
ni = ic->ic_bss;
IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr);
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr);
ni->ni_esslen = ic->ic_des_esslen;
memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen);
ni->ni_rssi = 0;
ni->ni_rstamp = 0;
ni->ni_tstamp.tsf = 0;
ni->ni_intval = ic->ic_lintval;
ni->ni_capinfo = 0;
ni->ni_erp = 0;
if (ic->ic_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 (ic->ic_opmode == IEEE80211_M_IBSS) {
ic->ic_flags |= IEEE80211_F_SIBSS;
ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */
ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */
}
/*
* Fix the channel and related attributes.
*/
ieee80211_set_chan(ic, ni, chan);
ic->ic_curmode = ieee80211_chan2mode(ic, chan);
/*
* Do mode-specific rate setup.
*/
if (ic->ic_curmode == IEEE80211_MODE_11G) {
/*
* Use a mixed 11b/11g rate set.
*/
ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11G);
} else if (ic->ic_curmode == IEEE80211_MODE_11B) {
/*
* Force pure 11b rate set.
*/
ieee80211_set11gbasicrates(&ni->ni_rates, IEEE80211_MODE_11B);
}
/*
* 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(ic);
ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
}
void
ieee80211_reset_bss(struct ieee80211com *ic)
{
struct ieee80211_node *ni, *obss;
ieee80211_node_table_reset(&ic->ic_scan);
ni = ieee80211_alloc_node(&ic->ic_scan, ic->ic_myaddr);
KASSERT(ni != NULL, ("unable to setup inital BSS node"));
obss = ic->ic_bss;
ic->ic_bss = ieee80211_ref_node(ni);
if (obss != NULL)
ieee80211_free_node(obss);
if (ic->ic_sta != NULL) {
ieee80211_node_table_free(ic->ic_sta);
ic->ic_sta = NULL;
}
}
static int
ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni)
{
u_int8_t rate;
int fail;
fail = 0;
if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
fail |= 0x01;
if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
ni->ni_chan != ic->ic_des_chan)
fail |= 0x01;
if (ic->ic_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 (ic->ic_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(ic, ni, IEEE80211_F_DONEGO);
if (rate & IEEE80211_RATE_BASIC)
fail |= 0x08;
if (ic->ic_des_esslen != 0 &&
(ni->ni_esslen != ic->ic_des_esslen ||
memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0))
fail |= 0x10;
if ((ic->ic_flags & IEEE80211_F_DESBSSID) &&
!IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid))
fail |= 0x20;
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(ic)) {
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(" %+4d", ni->ni_rssi);
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
return fail;
}
static __inline u_int8_t
maxrate(const struct ieee80211_node *ni)
{
const struct ieee80211_rateset *rs = &ni->ni_rates;
/* NB: assumes rate set is sorted (happens on frame receive) */
return rs->rs_rates[rs->rs_nrates-1] & IEEE80211_RATE_VAL;
}
/*
* Compare the capabilities of two nodes and decide which is
* more desirable (return >0 if a is considered better). Note
* that we assume compatibility/usability has already been checked
* so we don't need to (e.g. validate whether privacy is supported).
* Used to select the best scan candidate for association in a BSS.
*/
static int
ieee80211_node_compare(struct ieee80211com *ic,
const struct ieee80211_node *a,
const struct ieee80211_node *b)
{
u_int8_t maxa, maxb;
u_int8_t rssia, rssib;
/* privacy support preferred */
if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) &&
(b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
return 1;
if ((a->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0 &&
(b->ni_capinfo & IEEE80211_CAPINFO_PRIVACY))
return -1;
rssia = ic->ic_node_getrssi(a);
rssib = ic->ic_node_getrssi(b);
if (abs(rssib - rssia) < 5) {
/* best/max rate preferred if signal level close enough XXX */
maxa = maxrate(a);
maxb = maxrate(b);
if (maxa != maxb)
return maxa - maxb;
/* XXX use freq for channel preference */
/* for now just prefer 5Ghz band to all other bands */
if (IEEE80211_IS_CHAN_5GHZ(a->ni_chan) &&
!IEEE80211_IS_CHAN_5GHZ(b->ni_chan))
return 1;
if (!IEEE80211_IS_CHAN_5GHZ(a->ni_chan) &&
IEEE80211_IS_CHAN_5GHZ(b->ni_chan))
return -1;
}
/* all things being equal, use signal level */
return rssia - rssib;
}
/*
* Complete a scan of potential channels.
*/
void
ieee80211_end_scan(struct ieee80211com *ic)
{
struct ieee80211_node *ni, *nextbs, *selbs;
struct ieee80211_node_table *nt;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "end %s scan\n",
(ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive");
ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN);
nt = &ic->ic_scan;
ni = TAILQ_FIRST(&nt->nt_node);
ieee80211_notify_scan_done(ic);
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
u_int8_t maxrssi[IEEE80211_CHAN_MAX]; /* XXX off stack? */
int i, bestchan;
u_int8_t rssi;
/*
* The passive scan to look for existing AP's completed,
* select a channel to camp on. Identify the channels
* that already have one or more AP's and try to locate
* an unnoccupied one. If that fails, pick a channel that
* looks to be quietest.
*/
memset(maxrssi, 0, sizeof(maxrssi));
for (; ni != NULL; ni = nextbs) {
ieee80211_ref_node(ni);
nextbs = TAILQ_NEXT(ni, ni_list);
rssi = ic->ic_node_getrssi(ni);
i = ieee80211_chan2ieee(ic, ni->ni_chan);
if (rssi > maxrssi[i])
maxrssi[i] = rssi;
ieee80211_unref_node(&ni);
}
/* XXX select channel more intelligently */
bestchan = -1;
for (i = 0; i < IEEE80211_CHAN_MAX; i++)
if (isset(ic->ic_chan_active, i)) {
/*
* If the channel is unoccupied the max rssi
* should be zero; just take it. Otherwise
* track the channel with the lowest rssi and
* use that when all channels appear occupied.
*/
if (maxrssi[i] == 0) {
bestchan = i;
break;
}
if (maxrssi[i] < maxrssi[bestchan])
bestchan = i;
}
if (bestchan != -1) {
ieee80211_create_ibss(ic, &ic->ic_channels[bestchan]);
return;
}
/* no suitable channel, should not happen */
}
/*
* When manually sequencing the state machine; scan just once
* regardless of whether we have a candidate or not. The
* controlling application is expected to setup state and
* initiate an association.
*/
if (ic->ic_roaming == IEEE80211_ROAMING_MANUAL)
return;
/*
* Automatic sequencing; look for a candidate and
* if found join the network.
*/
if (ni == NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
"%s: no scan candidate\n", __func__);
notfound:
if (ic->ic_opmode == IEEE80211_M_IBSS &&
(ic->ic_flags & IEEE80211_F_IBSSON) &&
ic->ic_des_esslen != 0) {
ieee80211_create_ibss(ic, ic->ic_ibss_chan);
return;
}
/*
* Reset the list of channels to scan and start again.
*/
ieee80211_reset_scan(ic);
ic->ic_flags |= IEEE80211_F_SCAN;
ieee80211_next_scan(ic);
return;
}
selbs = NULL;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "\t%s\n",
"macaddr bssid chan rssi rate flag wep essid");
for (; ni != NULL; ni = nextbs) {
ieee80211_ref_node(ni);
nextbs = TAILQ_NEXT(ni, ni_list);
if (ni->ni_fails) {
/*
* The configuration of the access points may change
* during my scan. So delete the entry for the AP
* and retry to associate if there is another beacon.
*/
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN,
"%s: skip scan candidate %s, fails %u\n",
__func__, ether_sprintf(ni->ni_macaddr),
ni->ni_fails);
if (ni->ni_fails++ > 2)
ieee80211_free_node(ni);
continue;
}
if (ieee80211_match_bss(ic, ni) == 0) {
if (selbs == NULL)
selbs = ni;
else if (ieee80211_node_compare(ic, ni, selbs) > 0) {
ieee80211_unref_node(&selbs);
selbs = ni;
} else
ieee80211_unref_node(&ni);
} else {
ieee80211_unref_node(&ni);
}
}
if (selbs == NULL)
goto notfound;
if (!ieee80211_sta_join(ic, selbs)) {
ieee80211_unref_node(&selbs);
goto notfound;
}
}
/*
* 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 ieee80211com *ic, struct ieee80211_node *ni)
{
if (IEEE80211_ADDR_EQ(ni->ni_bssid, ic->ic_bss->ni_bssid)) {
/* unchanged, nothing to do */
return 0;
}
if (ieee80211_match_bss(ic, ni) != 0) { /* capabilities mismatch */
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"%s: merge failed, capabilities mismatch\n", __func__);
ic->ic_stats.is_ibss_capmismatch++;
return 0;
}
IEEE80211_DPRINTF(ic, 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_join(ic, ni);
}
/*
* Join the specified IBSS/BSS network. The node is assumed to
* be passed in with a held reference.
*/
int
ieee80211_sta_join(struct ieee80211com *ic, struct ieee80211_node *selbs)
{
struct ieee80211_node *obss;
if (ic->ic_opmode == IEEE80211_M_IBSS) {
/*
* Check rate set before committing to this node.
*/
ieee80211_fix_rate(ic, selbs, IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (selbs->ni_rates.rs_nrates == 0) {
selbs->ni_fails++;
ic->ic_stats.is_ibss_norate++;
return 0;
}
/*
* Create the neighbor table; it will already
* exist if we are simply switching mastership.
*/
if (ic->ic_sta == NULL) {
ic->ic_sta = ieee80211_node_table_alloc(ic,
"neighbor", ic->ic_inact_run,
ieee80211_timeout_stations);
if (ic->ic_sta == NULL) {
/*
* Should remain in SCAN state and retry.
*/
/* XXX stat+msg */
return 0;
}
}
}
/*
* Committed to selbs, setup state.
*/
obss = ic->ic_bss;
ic->ic_bss = selbs;
if (obss != NULL)
ieee80211_free_node(obss);
/*
* Set the erp state (mostly the slot time) to deal with
* the auto-select case; this should be redundant if the
* mode is locked.
*/
ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan);
ieee80211_reset_erp(ic);
ieee80211_wme_initparams(ic);
if (ic->ic_opmode == IEEE80211_M_IBSS)
ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
else
ieee80211_new_state(ic, IEEE80211_S_AUTH, -1);
return 1;
}
/*
* Leave the specified IBSS/BSS network. The node is assumed to
* be passed in with a held reference.
*/
void
ieee80211_sta_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
{
ic->ic_node_cleanup(ni);
ieee80211_notify_node_leave(ic, ni);
}
static struct ieee80211_node *
node_alloc(struct ieee80211_node_table *nt)
{
struct ieee80211_node *ni;
MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node),
M_80211_NODE, M_NOWAIT | M_ZERO);
return ni;
}
/*
* 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 ieee80211com *ic = ni->ni_ic;
int i, qlen;
/* NB: preserve ni_table */
if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
ic->ic_ps_sta--;
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] power save mode off, %u sta's in ps mode\n",
ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta);
}
/*
* Drain power save queue and, if needed, clear TIM.
*/
IEEE80211_NODE_SAVEQ_DRAIN(ni, qlen);
if (qlen != 0 && ic->ic_set_tim != NULL)
ic->ic_set_tim(ic, ni, 0);
ni->ni_associd = 0;
if (ni->ni_challenge != NULL) {
FREE(ni->ni_challenge, M_DEVBUF);
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;
}
ieee80211_crypto_delkey(ic, &ni->ni_ucastkey);
#undef N
}
static void
node_free(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
ic->ic_node_cleanup(ni);
if (ni->ni_wpa_ie != NULL)
FREE(ni->ni_wpa_ie, M_DEVBUF);
if (ni->ni_wme_ie != NULL)
FREE(ni->ni_wme_ie, M_DEVBUF);
IEEE80211_NODE_SAVEQ_DESTROY(ni);
FREE(ni, M_80211_NODE);
}
static u_int8_t
node_getrssi(const struct ieee80211_node *ni)
{
return ni->ni_rssi;
}
static void
ieee80211_setup_node(struct ieee80211_node_table *nt,
struct ieee80211_node *ni, const u_int8_t *macaddr)
{
struct ieee80211com *ic = nt->nt_ic;
int hash;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"%s %s in %s table\n", __func__,
ether_sprintf(macaddr), nt->nt_name);
IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
hash = IEEE80211_NODE_HASH(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 */
ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey, IEEE80211_KEYIX_NONE);
ni->ni_inact_reload = nt->nt_inact_init;
ni->ni_inact = ni->ni_inact_reload;
IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
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_ic = ic;
IEEE80211_NODE_UNLOCK(nt);
}
struct ieee80211_node *
ieee80211_alloc_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr)
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni;
ni = ic->ic_node_alloc(nt);
if (ni != NULL)
ieee80211_setup_node(nt, ni, macaddr);
else
ic->ic_stats.is_rx_nodealloc++;
return ni;
}
struct ieee80211_node *
ieee80211_dup_bss(struct ieee80211_node_table *nt, const u_int8_t *macaddr)
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni;
ni = ic->ic_node_alloc(nt);
if (ni != NULL) {
ieee80211_setup_node(nt, ni, macaddr);
/*
* Inherit from ic_bss.
*/
ni->ni_authmode = ic->ic_bss->ni_authmode;
ni->ni_txpower = ic->ic_bss->ni_txpower;
ni->ni_vlan = ic->ic_bss->ni_vlan; /* XXX?? */
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan);
ni->ni_rsn = ic->ic_bss->ni_rsn;
} else
ic->ic_stats.is_rx_nodealloc++;
return ni;
}
static struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
_ieee80211_find_node_debug(struct ieee80211_node_table *nt,
const u_int8_t *macaddr, const char *func, int line)
#else
_ieee80211_find_node(struct ieee80211_node_table *nt,
const u_int8_t *macaddr)
#endif
{
struct ieee80211_node *ni;
int hash;
IEEE80211_NODE_LOCK_ASSERT(nt);
hash = IEEE80211_NODE_HASH(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(nt->nt_ic, IEEE80211_MSG_NODE,
"%s (%s:%u) %s refcnt %d\n", __func__, func, line,
ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni));
#endif
return ni;
}
}
return NULL;
}
#ifdef IEEE80211_DEBUG_REFCNT
#define _ieee80211_find_node(nt, mac) \
_ieee80211_find_node_debug(nt, mac, func, line)
#endif
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_node_debug(struct ieee80211_node_table *nt,
const u_int8_t *macaddr, const char *func, int line)
#else
ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr)
#endif
{
struct ieee80211_node *ni;
IEEE80211_NODE_LOCK(nt);
ni = _ieee80211_find_node(nt, 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 ieee80211_node_table *nt,
const u_int8_t macaddr[IEEE80211_ADDR_LEN])
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni;
ni = ieee80211_dup_bss(nt, macaddr);
if (ni != NULL) {
/* XXX no rate negotiation; just dup */
ni->ni_rates = ic->ic_bss->ni_rates;
if (ic->ic_newassoc != NULL)
ic->ic_newassoc(ic, ni, 1);
/* XXX not right for 802.1x/WPA */
ieee80211_node_authorize(ic, ni);
ieee80211_ref_node(ni); /* hold reference */
}
return ni;
}
/*
* Locate the node for sender, track state, and then pass the
* (referenced) node up to the 802.11 layer for its use. We
* are required to pass some node so we fall back to ic_bss
* when this frame is from an unknown sender. The 802.11 layer
* knows this means the sender wasn't in the node table and
* acts accordingly.
*/
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
{
#define IS_CTL(wh) \
((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL)
#define IS_PSPOLL(wh) \
((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
struct ieee80211_node_table *nt;
struct ieee80211_node *ni;
/* XXX may want scanned nodes in the neighbor table for adhoc */
if (ic->ic_opmode == IEEE80211_M_STA ||
ic->ic_opmode == IEEE80211_M_MONITOR ||
(ic->ic_flags & IEEE80211_F_SCAN))
nt = &ic->ic_scan;
else
nt = ic->ic_sta;
/* XXX check ic_bss first in station mode */
/* XXX 4-address frames? */
IEEE80211_NODE_LOCK(nt);
if (IS_CTL(wh) && !IS_PSPOLL(wh) /*&& !IS_RTS(ah)*/)
ni = _ieee80211_find_node(nt, wh->i_addr1);
else
ni = _ieee80211_find_node(nt, wh->i_addr2);
IEEE80211_NODE_UNLOCK(nt);
return (ni != NULL ? ni : ieee80211_ref_node(ic->ic_bss));
#undef IS_PSPOLL
#undef IS_CTL
}
/*
* 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 ieee80211com *ic, const u_int8_t *macaddr,
const char *func, int line)
#else
ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr)
#endif
{
struct ieee80211_node_table *nt = ic->ic_sta;
struct ieee80211_node *ni;
/*
* The destination address should be in the node table
* unless we are operating in station mode or this is a
* multicast/broadcast frame.
*/
if (nt == NULL || IEEE80211_IS_MULTICAST(macaddr))
return ieee80211_ref_node(ic->ic_bss);
/* XXX can't hold lock across dup_bss 'cuz of recursive locking */
IEEE80211_NODE_LOCK(nt);
ni = _ieee80211_find_node(nt, macaddr);
IEEE80211_NODE_UNLOCK(nt);
if (ni == NULL) {
if (ic->ic_opmode == IEEE80211_M_IBSS ||
ic->ic_opmode == IEEE80211_M_AHDEMO)
ni = ieee80211_fakeup_adhoc_node(nt, macaddr);
else {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
"[%s] no node, discard frame (%s)\n",
ether_sprintf(macaddr), __func__);
ic->ic_stats.is_tx_nonode++;
}
}
return ni;
}
/*
* Like find but search based on the channel too.
*/
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_node_with_channel_debug(struct ieee80211_node_table *nt,
const u_int8_t *macaddr, struct ieee80211_channel *chan,
const char *func, int line)
#else
ieee80211_find_node_with_channel(struct ieee80211_node_table *nt,
const u_int8_t *macaddr, struct ieee80211_channel *chan)
#endif
{
struct ieee80211_node *ni;
int hash;
hash = IEEE80211_NODE_HASH(macaddr);
IEEE80211_NODE_LOCK(nt);
LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) &&
ni->ni_chan == chan) {
ieee80211_ref_node(ni); /* mark referenced */
IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
#ifdef IEEE80211_DEBUG_REFCNT
"%s (%s:%u) %s refcnt %d\n", __func__, func, line,
#else
"%s %s refcnt %d\n", __func__,
#endif
ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni));
break;
}
}
IEEE80211_NODE_UNLOCK(nt);
return ni;
}
/*
* Like find but search based on the ssid too.
*/
struct ieee80211_node *
#ifdef IEEE80211_DEBUG_REFCNT
ieee80211_find_node_with_ssid_debug(struct ieee80211_node_table *nt,
const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid,
const char *func, int line)
#else
ieee80211_find_node_with_ssid(struct ieee80211_node_table *nt,
const u_int8_t *macaddr, u_int ssidlen, const u_int8_t *ssid)
#endif
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni;
int hash;
hash = IEEE80211_NODE_HASH(macaddr);
IEEE80211_NODE_LOCK(nt);
LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) &&
ni->ni_esslen == ic->ic_des_esslen &&
memcmp(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen) == 0) {
ieee80211_ref_node(ni); /* mark referenced */
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
#ifdef IEEE80211_DEBUG_REFCNT
"%s (%s:%u) %s refcnt %d\n", __func__, func, line,
#else
"%s %s refcnt %d\n", __func__,
#endif
ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni));
break;
}
}
IEEE80211_NODE_UNLOCK(nt);
return ni;
}
static void
_ieee80211_free_node(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_node_table *nt = ni->ni_table;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"%s %s in %s table\n", __func__, ether_sprintf(ni->ni_macaddr),
nt != NULL ? nt->nt_name : "<gone>");
IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
if (nt != NULL) {
TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
LIST_REMOVE(ni, ni_hash);
}
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(nt->nt_ic, IEEE80211_MSG_NODE,
"%s (%s:%u) %s refcnt %d\n", __func__, func, line,
ether_sprintf(ni->ni_macaddr), ieee80211_node_refcnt(ni)-1);
#endif
if (ieee80211_node_dectestref(ni)) {
/*
* Beware; if the node is marked gone then it's already
* been removed from the table and we cannot assume the
* table still exists. Regardless, there's no need to lock
* the table.
*/
if (ni->ni_table != NULL) {
IEEE80211_NODE_LOCK(nt);
_ieee80211_free_node(ni);
IEEE80211_NODE_UNLOCK(nt);
} else
_ieee80211_free_node(ni);
}
}
/*
* 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)
{
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. This normally only happens for ic_bss.
*/
TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
LIST_REMOVE(ni, ni_hash);
ni->ni_table = NULL; /* clear reference */
} else
_ieee80211_free_node(ni);
}
static void
ieee80211_free_allnodes_locked(struct ieee80211_node_table *nt)
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"%s: free all nodes in %s table\n", __func__, nt->nt_name);
while ((ni = TAILQ_FIRST(&nt->nt_node)) != NULL) {
if (ni->ni_associd != 0) {
if (ic->ic_auth->ia_node_leave != NULL)
ic->ic_auth->ia_node_leave(ic, ni);
IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
}
node_reclaim(nt, ni);
}
ieee80211_reset_erp(ic);
}
static void
ieee80211_free_allnodes(struct ieee80211_node_table *nt)
{
IEEE80211_NODE_LOCK(nt);
ieee80211_free_allnodes_locked(nt);
IEEE80211_NODE_UNLOCK(nt);
}
/*
* Timeout entries in the scan cache.
*/
static void
ieee80211_timeout_scan_candidates(struct ieee80211_node_table *nt)
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni, *tni;
IEEE80211_NODE_LOCK(nt);
ni = ic->ic_bss;
/* XXX belongs elsewhere */
if (ni->ni_rxfrag[0] != NULL && ticks > ni->ni_rxfragstamp + hz) {
m_freem(ni->ni_rxfrag[0]);
ni->ni_rxfrag[0] = NULL;
}
TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, tni) {
if (ni->ni_inact && --ni->ni_inact == 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"[%s] scan candidate purged from cache "
"(refcnt %u)\n", ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni)-1);
node_reclaim(nt, ni);
}
}
IEEE80211_NODE_UNLOCK(nt);
nt->nt_inact_timer = IEEE80211_INACT_WAIT;
}
/*
* 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 ieee80211_node_table *nt)
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni;
u_int gen;
IEEE80211_SCAN_LOCK(nt);
gen = nt->nt_scangen++;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"%s: sta scangen %u\n", __func__, gen);
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;
/*
* Free fragment if not needed anymore
* (last fragment older than 1s).
* XXX doesn't belong here
*/
if (ni->ni_rxfrag[0] != NULL &&
ticks > ni->ni_rxfragstamp + hz) {
m_freem(ni->ni_rxfrag[0]);
ni->ni_rxfrag[0] = NULL;
}
ni->ni_inact--;
if (ni->ni_associd != 0) {
/*
* 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 we can check
* and/or adjust only the head of the list.
*/
if (IEEE80211_NODE_SAVEQ_QLEN(ni) != 0) {
struct mbuf *m;
int discard = 0;
IEEE80211_NODE_SAVEQ_LOCK(ni);
while (IF_POLL(&ni->ni_savedq, m) != NULL &&
M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
IEEE80211_DPRINTF(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);
if (discard != 0) {
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_POWER,
"[%s] discard %u frames for age\n",
ether_sprintf(ni->ni_macaddr),
discard);
IEEE80211_NODE_STAT_ADD(ni,
ps_discard, discard);
if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0)
ic->ic_set_tim(ic, ni, 0);
}
}
/*
* 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...).
*/
if (0 < ni->ni_inact &&
ni->ni_inact <= ic->ic_inact_probe) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"[%s] probe station due to inactivity\n",
ether_sprintf(ni->ni_macaddr));
IEEE80211_NODE_UNLOCK(nt);
ieee80211_send_nulldata(ic, ni);
/* XXX stat? */
goto restart;
}
}
if (ni->ni_inact <= 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"[%s] station timed out due to inactivity "
"(refcnt %u)\n", ether_sprintf(ni->ni_macaddr),
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 will result
* in LOR between the node lock and the driver lock.
*/
IEEE80211_NODE_UNLOCK(nt);
if (ni->ni_associd != 0) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_EXPIRE);
}
ieee80211_node_leave(ic, ni);
ic->ic_stats.is_node_timeout++;
goto restart;
}
}
IEEE80211_NODE_UNLOCK(nt);
IEEE80211_SCAN_UNLOCK(nt);
nt->nt_inact_timer = IEEE80211_INACT_WAIT;
}
void
ieee80211_iterate_nodes(struct ieee80211_node_table *nt, ieee80211_iter_func *f, void *arg)
{
struct ieee80211_node *ni;
u_int gen;
IEEE80211_SCAN_LOCK(nt);
gen = nt->nt_scangen++;
IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
"%s: sta scangen %u\n", __func__, gen);
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_SCAN_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[0],
ni->ni_rxseqs[0] >> IEEE80211_SEQ_SEQ_SHIFT,
ni->ni_rxseqs[0] & IEEE80211_SEQ_FRAG_MASK,
ni->ni_rxfragstamp);
printf("\trstamp %u rssi %u intval %u capinfo 0x%x\n",
ni->ni_rstamp, ni->ni_rssi, 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("\tfails %u inact %u txrate %u\n",
ni->ni_fails, ni->ni_inact, ni->ni_txrate);
}
void
ieee80211_dump_nodes(struct ieee80211_node_table *nt)
{
ieee80211_iterate_nodes(nt,
(ieee80211_iter_func *) ieee80211_dump_node, nt);
}
/*
* Handle a station joining an 11g network.
*/
static void
ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
{
/*
* 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_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] station needs long slot time, count %d\n",
ether_sprintf(ni->ni_macaddr), ic->ic_longslotsta);
/* XXX vap's w/ conflicting needs won't work */
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(ic, &ni->ni_rates)) {
ic->ic_nonerpsta++;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] station is !ERP, %d non-ERP stations associated\n",
ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta);
/*
* If protection is configured, enable it.
*/
if (ic->ic_protmode != IEEE80211_PROT_NONE) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"%s: enable use of protection\n", __func__);
ic->ic_flags |= IEEE80211_F_USEPROT;
}
/*
* 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_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] station needs long preamble\n",
ether_sprintf(ni->ni_macaddr));
ic->ic_flags |= IEEE80211_F_USEBARKER;
ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
}
} else
ni->ni_flags |= IEEE80211_NODE_ERP;
}
void
ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int resp)
{
int newassoc;
if (ni->ni_associd == 0) {
u_int16_t aid;
/*
* It would be good to search the bitmap
* more efficiently, but this will do for now.
*/
for (aid = 1; aid < ic->ic_max_aid; aid++) {
if (!IEEE80211_AID_ISSET(aid,
ic->ic_aid_bitmap))
break;
}
if (aid >= ic->ic_max_aid) {
IEEE80211_SEND_MGMT(ic, ni, resp,
IEEE80211_REASON_ASSOC_TOOMANY);
ieee80211_node_leave(ic, ni);
return;
}
ni->ni_associd = aid | 0xc000;
IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap);
ic->ic_sta_assoc++;
newassoc = 1;
if (ic->ic_curmode == IEEE80211_MODE_11G ||
ic->ic_curmode == IEEE80211_MODE_TURBO_G)
ieee80211_node_join_11g(ic, ni);
} else
newassoc = 0;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG,
"[%s] station %sassociated at aid %d: %s preamble, %s slot time%s%s\n",
ether_sprintf(ni->ni_macaddr), newassoc ? "" : "re",
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" : ""
);
/* give driver a chance to setup state like ni_txrate */
if (ic->ic_newassoc != NULL)
ic->ic_newassoc(ic, ni, newassoc);
ni->ni_inact_reload = ic->ic_inact_auth;
ni->ni_inact = ni->ni_inact_reload;
IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS);
/* tell the authenticator about new station */
if (ic->ic_auth->ia_node_join != NULL)
ic->ic_auth->ia_node_join(ic, ni);
ieee80211_notify_node_join(ic, ni, newassoc);
}
/*
* Handle a station leaving an 11g network.
*/
static void
ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
{
KASSERT(ic->ic_curmode == IEEE80211_MODE_11G ||
ic->ic_curmode == IEEE80211_MODE_TURBO_G,
("not in 11g, curmode %x", ic->ic_curmode));
/*
* 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_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] long slot time station leaves, count now %d\n",
ether_sprintf(ni->ni_macaddr), 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(ic, 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_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] non-ERP station leaves, count now %d\n",
ether_sprintf(ni->ni_macaddr), ic->ic_nonerpsta);
if (ic->ic_nonerpsta == 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"%s: disable use of protection\n", __func__);
ic->ic_flags &= ~IEEE80211_F_USEPROT;
/* XXX verify mode? */
if (ic->ic_caps & IEEE80211_C_SHPREAMBLE) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"%s: re-enable use of short preamble\n",
__func__);
ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
ic->ic_flags &= ~IEEE80211_F_USEBARKER;
}
}
}
}
/*
* Handle bookkeeping for station deauthentication/disassociation
* when operating as an ap.
*/
void
ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
{
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG,
"[%s] station with aid %d leaves\n",
ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_AID(ni));
KASSERT(ic->ic_opmode == IEEE80211_M_HOSTAP ||
ic->ic_opmode == IEEE80211_M_IBSS ||
ic->ic_opmode == IEEE80211_M_AHDEMO,
("unexpected operating mode %u", ic->ic_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 (ic->ic_auth->ia_node_leave != NULL)
ic->ic_auth->ia_node_leave(ic, ni);
IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
ni->ni_associd = 0;
ic->ic_sta_assoc--;
if (ic->ic_curmode == IEEE80211_MODE_11G ||
ic->ic_curmode == IEEE80211_MODE_TURBO_G)
ieee80211_node_leave_11g(ic, ni);
/*
* 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(ic, ni);
done:
ni->ni_inact_reload = ic->ic_inact_init; /* just in case */
ieee80211_free_node(ni);
}
u_int8_t
ieee80211_getrssi(struct ieee80211com *ic)
{
#define NZ(x) ((x) == 0 ? 1 : (x))
struct ieee80211_node_table *nt = ic->ic_sta;
u_int32_t rssi_samples, rssi_total;
struct ieee80211_node *ni;
rssi_total = 0;
rssi_samples = 0;
switch (ic->ic_opmode) {
case IEEE80211_M_IBSS: /* average of all ibss neighbors */
nt = ic->ic_sta;
if (nt == NULL)
break;
/* XXX locking */
TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list)
if (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) {
rssi_samples++;
rssi_total += ic->ic_node_getrssi(ni);
}
break;
case IEEE80211_M_AHDEMO: /* average of all neighbors */
nt = ic->ic_sta;
if (nt == NULL)
break;
/* XXX locking */
TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list) {
rssi_samples++;
rssi_total += ic->ic_node_getrssi(ni);
}
break;
case IEEE80211_M_HOSTAP: /* average of all associated stations */
nt = ic->ic_sta;
if (nt == NULL)
break;
/* XXX locking */
TAILQ_FOREACH(ni, &ic->ic_sta->nt_node, ni_list)
if (IEEE80211_AID(ni->ni_associd) != 0) {
rssi_samples++;
rssi_total += ic->ic_node_getrssi(ni);
}
break;
case IEEE80211_M_MONITOR: /* XXX */
case IEEE80211_M_STA: /* use stats from associated ap */
default:
if (ic->ic_bss != NULL)
rssi_total = ic->ic_node_getrssi(ic->ic_bss);
rssi_samples = 1;
break;
}
return rssi_total / NZ(rssi_samples);
#undef NZ
}
/*
* Indicate whether there are frames queued for a station in power-save mode.
*/
static void
ieee80211_set_tim(struct ieee80211com *ic, struct ieee80211_node *ni, int set)
{
u_int16_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--;
}
ic->ic_flags |= IEEE80211_F_TIMUPDATE;
}
IEEE80211_BEACON_UNLOCK(ic);
}
/*
* Node table support.
*/
static void
ieee80211_node_table_init(struct ieee80211com *ic,
struct ieee80211_node_table *nt,
const char *name, int inact,
void (*timeout)(struct ieee80211_node_table *))
{
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"%s %s table, inact %u\n", __func__, name, inact);
nt->nt_ic = ic;
/* XXX need unit */
IEEE80211_NODE_LOCK_INIT(nt, ic->ic_ifp->if_xname);
IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_ifp->if_xname);
TAILQ_INIT(&nt->nt_node);
nt->nt_name = name;
nt->nt_scangen = 1;
nt->nt_inact_init = inact;
nt->nt_timeout = timeout;
}
static struct ieee80211_node_table *
ieee80211_node_table_alloc(struct ieee80211com *ic,
const char *name, int inact,
void (*timeout)(struct ieee80211_node_table *))
{
struct ieee80211_node_table *nt;
MALLOC(nt, struct ieee80211_node_table *,
sizeof(struct ieee80211_node_table),
M_DEVBUF, M_NOWAIT | M_ZERO);
if (nt == NULL) {
printf("%s: no memory node table!\n", __func__);
return NULL;
}
ieee80211_node_table_init(ic, nt, name, inact, timeout);
return nt;
}
void
ieee80211_node_table_reset(struct ieee80211_node_table *nt)
{
IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
"%s %s table\n", __func__, nt->nt_name);
IEEE80211_NODE_LOCK(nt);
nt->nt_inact_timer = 0;
ieee80211_free_allnodes_locked(nt);
IEEE80211_NODE_UNLOCK(nt);
}
static void
ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
{
IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
"%s %s table\n", __func__, nt->nt_name);
ieee80211_free_allnodes_locked(nt);
IEEE80211_SCAN_LOCK_DESTROY(nt);
IEEE80211_NODE_LOCK_DESTROY(nt);
}
/*
* NB: public for use in ieee80211_proto.c
*/
void
ieee80211_node_table_free(struct ieee80211_node_table *nt)
{
IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
"%s %s table\n", __func__, nt->nt_name);
IEEE80211_NODE_LOCK(nt);
nt->nt_inact_timer = 0;
ieee80211_node_table_cleanup(nt);
FREE(nt, M_DEVBUF);
}
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