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freebsd-skq/sys/net80211/ieee80211_node.c
Sam Leffler 70e28b9a2d change ieee80211_fix_rate to take a rate set instead of using 
ni_rates; this lets us re-use the code to check 11n HT rates

MFC after:	2 weeks
2007-03-11 07:22:21 +00:00

2396 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>
/*
* Association id's are managed with a bit vector.
*/
#define IEEE80211_AID_SET(b, w) \
((w)[IEEE80211_AID(b) / 32] |= (1 << (IEEE80211_AID(b) % 32)))
#define IEEE80211_AID_CLR(b, w) \
((w)[IEEE80211_AID(b) / 32] &= ~(1 << (IEEE80211_AID(b) % 32)))
#define IEEE80211_AID_ISSET(b, w) \
((w)[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 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 ieee80211_node *, int set);
static void ieee80211_node_table_init(struct ieee80211com *ic,
struct ieee80211_node_table *nt, const char *name,
int inact, int keyixmax,
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_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;
/* NB: driver should override */
ic->ic_max_aid = IEEE80211_AID_DEF;
ic->ic_set_tim = ieee80211_set_tim;
}
void
ieee80211_node_lateattach(struct ieee80211com *ic)
{
struct ieee80211_rsnparms *rsn;
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__);
}
ieee80211_node_table_init(ic, &ic->ic_sta, "station",
IEEE80211_INACT_INIT, ic->ic_crypto.cs_max_keyix,
ieee80211_timeout_stations);
ieee80211_node_table_init(ic, &ic->ic_scan, "scan",
IEEE80211_INACT_SCAN, 0,
ieee80211_timeout_scan_candidates);
ieee80211_reset_bss(ic);
/*
* Setup "global settings" in the bss node so that
* each new station automatically inherits them.
*/
rsn = &ic->ic_bss->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_auth = ieee80211_authenticator_get(ic->ic_bss->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);
ieee80211_node_table_cleanup(&ic->ic_sta);
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 ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
ni->ni_flags |= IEEE80211_NODE_AUTH;
ni->ni_inact_reload = ic->ic_inact_run;
}
void
ieee80211_node_unauthorize(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 void
ieee80211_set_chan(struct ieee80211com *ic,
struct ieee80211_node *ni, struct ieee80211_channel *chan)
{
if (chan == IEEE80211_CHAN_ANYC) /* XXX while scanning */
chan = ic->ic_curchan;
ni->ni_chan = chan;
ni->ni_rates = *ieee80211_get_suprates(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));
#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_curchan));
}
#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;
ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
chan = ic->ic_curchan;
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_curchan),
ieee80211_chan2ieee(ic, chan));
ic->ic_curchan = chan;
/*
* XXX drivers should do this as needed,
* XXX for now maintain compatibility
*/
ic->ic_bss->ni_rates = *ieee80211_get_suprates(ic, chan);
ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
return 1;
}
} while (chan != ic->ic_curchan);
ieee80211_end_scan(ic);
return 0;
}
/*
* Probe the curent channel, if allowed, while scanning.
* If the channel is not marked passive-only then send
* a probe request immediately. Otherwise mark state and
* listen for beacons on the channel; if we receive something
* then we'll transmit a probe request.
*/
void
ieee80211_probe_curchan(struct ieee80211com *ic, int force)
{
struct ifnet *ifp = ic->ic_ifp;
if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0 || force) {
/*
* XXX send both broadcast+directed probe request
*/
ieee80211_send_probereq(ic->ic_bss,
ic->ic_myaddr, ifp->if_broadcastaddr,
ifp->if_broadcastaddr,
ic->ic_des_essid, ic->ic_des_esslen,
ic->ic_opt_ie, ic->ic_opt_ie_len);
} else
ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN;
}
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;
nbss->ni_rsn = obss->ni_rsn;
/* XXX statistics? */
}
void
ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan)
{
struct ieee80211_node_table *nt;
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.
*/
nt = &ic->ic_sta;
IEEE80211_NODE_LOCK(nt);
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
nt->nt_name = "station";
nt->nt_inact_init = ic->ic_inact_init;
} else {
nt->nt_name = "neighbor";
nt->nt_inact_init = ic->ic_inact_run;
}
IEEE80211_NODE_UNLOCK(nt);
ni = ieee80211_alloc_node(&ic->ic_sta, ic->ic_myaddr);
if (ni == NULL) {
/* XXX recovery? */
return;
}
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);
copy_bss(ni, ic->ic_bss);
ni->ni_intval = ic->ic_bintval;
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 */
if (ic->ic_flags & IEEE80211_F_DESBSSID)
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_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 (ic->ic_opmode == IEEE80211_M_AHDEMO) {
if (ic->ic_flags & IEEE80211_F_DESBSSID)
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid);
else
memset(ni->ni_bssid, 0, IEEE80211_ADDR_LEN);
}
/*
* Fix the channel and related attributes.
*/
ieee80211_set_chan(ic, ni, chan);
ic->ic_curchan = chan;
ic->ic_curmode = ieee80211_chan2mode(ic, chan);
/*
* Do mode-specific rate setup.
*/
if (IEEE80211_IS_CHAN_FULL(chan) &&
(ic->ic_curmode == IEEE80211_MODE_11G ||
ic->ic_curmode == IEEE80211_MODE_11B))
ieee80211_set11gbasicrates(&ni->ni_rates, ic->ic_curmode);
(void) ieee80211_sta_join(ic, ieee80211_ref_node(ni));
}
void
ieee80211_reset_bss(struct ieee80211com *ic)
{
struct ieee80211_node *ni, *obss;
ieee80211_node_table_reset(&ic->ic_scan);
ieee80211_node_table_reset(&ic->ic_sta);
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) {
copy_bss(ni, obss);
ni->ni_intval = ic->ic_bintval;
ieee80211_free_node(obss);
}
}
/* XXX tunable */
#define STA_FAILS_MAX 2 /* assoc failures before ignored */
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(ni, &ni->ni_rates,
IEEE80211_F_JOIN | IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
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;
if (ni->ni_fails >= STA_FAILS_MAX)
fail |= 0x40;
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(ic)) {
printf(" %c %s",
fail & 0x40 ? '=' : fail & 0x80 ? '^' : 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;
int weight;
/* 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;
/* compare count of previous failures */
weight = b->ni_fails - a->ni_fails;
if (abs(weight) > 1)
return weight;
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;
}
/*
* Mark an ongoing scan stopped.
*/
void
ieee80211_cancel_scan(struct ieee80211com *ic)
{
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s: end %s scan\n",
__func__,
(ic->ic_flags & IEEE80211_F_ASCAN) ? "active" : "passive");
ic->ic_flags &= ~(IEEE80211_F_SCAN | IEEE80211_F_ASCAN);
ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
}
/*
* Complete a scan of potential channels.
*/
void
ieee80211_end_scan(struct ieee80211com *ic)
{
struct ieee80211_node_table *nt = &ic->ic_scan;
struct ieee80211_node *ni, *selbs;
ieee80211_cancel_scan(ic);
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 unoccupied one. If that fails, pick a channel that
* looks to be quietest.
*/
memset(maxrssi, 0, sizeof(maxrssi));
IEEE80211_NODE_LOCK(nt);
TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
rssi = ic->ic_node_getrssi(ni);
i = ieee80211_chan2ieee(ic, ni->ni_chan);
if (rssi > maxrssi[i])
maxrssi[i] = rssi;
}
IEEE80211_NODE_UNLOCK(nt);
/* 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 (bestchan == -1 ||
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.
*/
/* NB: unlocked read should be ok */
if (TAILQ_FIRST(&nt->nt_node) == 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;
}
/*
* Decrement the failure counts so entries will be
* reconsidered the next time around. We really want
* to do this only for sta's where we've previously
* had some success.
*/
IEEE80211_NODE_LOCK(nt);
TAILQ_FOREACH(ni, &nt->nt_node, ni_list)
if (ni->ni_fails)
ni->ni_fails--;
IEEE80211_NODE_UNLOCK(nt);
/*
* 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");
IEEE80211_NODE_LOCK(nt);
TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
if (ieee80211_match_bss(ic, ni) == 0) {
if (selbs == NULL)
selbs = ni;
else if (ieee80211_node_compare(ic, ni, selbs) > 0)
selbs = ni;
}
}
if (selbs != NULL) /* NB: grab ref while dropping lock */
(void) ieee80211_ref_node(selbs);
IEEE80211_NODE_UNLOCK(nt);
if (selbs == NULL)
goto notfound;
if (!ieee80211_sta_join(ic, selbs)) {
ieee80211_free_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 ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
if (ni == ic->ic_bss ||
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, ieee80211_ref_node(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) {
struct ieee80211_node_table *nt;
/*
* Fillin the neighbor table; it will already
* exist if we are simply switching mastership.
* XXX ic_sta always setup so this is unnecessary?
*/
nt = &ic->ic_sta;
IEEE80211_NODE_LOCK(nt);
nt->nt_name = "neighbor";
nt->nt_inact_init = ic->ic_inact_run;
IEEE80211_NODE_UNLOCK(nt);
}
/*
* Committed to selbs, setup state.
*/
obss = ic->ic_bss;
ic->ic_bss = selbs; /* NB: caller assumed to bump refcnt */
if (obss != NULL) {
copy_bss(selbs, obss);
ieee80211_free_node(obss);
}
/*
* Delete unusable rates; we've already checked
* that the negotiated rate set is acceptable.
*/
ieee80211_fix_rate(ic->ic_bss, &ic->ic_bss->ni_rates,
IEEE80211_F_DODEL | IEEE80211_F_JOIN);
/*
* 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);
ic->ic_curchan = selbs->ni_chan;
ieee80211_reset_erp(ic);
ieee80211_wme_initparams(ic);
if (ic->ic_opmode == IEEE80211_M_STA)
ieee80211_new_state(ic, IEEE80211_S_AUTH, -1);
else
ieee80211_new_state(ic, IEEE80211_S_RUN, -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);
}
/*
* 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.
*/
ni->ni_flags &= ~IEEE80211_NODE_AREF;
/*
* 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(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;
}
/*
* 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;
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 %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(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;
}
/*
* 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 ieee80211com *ic, const u_int8_t *macaddr)
{
struct ieee80211_node *ni;
ni = ic->ic_node_alloc(&ic->ic_sta);
if (ni != NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"%s %p<%s>\n", __func__, ni, ether_sprintf(macaddr));
IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
ieee80211_node_initref(ni); /* mark referenced */
ni->ni_txpower = ic->ic_bss->ni_txpower;
/* NB: required by ieee80211_fix_rate */
ieee80211_set_chan(ic, ni, ic->ic_bss->ni_chan);
ieee80211_crypto_resetkey(ic, &ni->ni_ucastkey,
IEEE80211_KEYIX_NONE);
/* XXX optimize away */
IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
ni->ni_table = NULL; /* NB: pedantic */
ni->ni_ic = ic;
} else {
/* XXX msg */
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) %p<%s> refcnt %d\n", __func__,
func, line,
ni, 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;
IEEE80211_DPRINTF(nt->nt_ic, IEEE80211_MSG_NODE,
"%s: mac<%s>\n", __func__, ether_sprintf(macaddr));
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(ni, 1);
/* XXX not right for 802.1x/WPA */
ieee80211_node_authorize(ni);
if (ic->ic_opmode == IEEE80211_M_AHDEMO) {
/*
* Blindly propagate capabilities based on the
* local configuration. In particular this permits
* us to use QoS to disable ACK's.
*/
if (ic->ic_flags & IEEE80211_F_WME)
ni->ni_flags |= IEEE80211_NODE_QOS;
}
}
return ni;
}
#ifdef IEEE80211_DEBUG
static void
dump_probe_beacon(u_int8_t subtype, int isnew,
const u_int8_t mac[IEEE80211_ADDR_LEN],
const struct ieee80211_scanparams *sp)
{
printf("[%s] %s%s on chan %u (bss chan %u) ",
ether_sprintf(mac), isnew ? "new " : "",
ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT],
sp->chan, sp->bchan);
ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]);
printf("\n");
if (isnew) {
printf("[%s] caps 0x%x bintval %u erp 0x%x",
ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp);
if (sp->country != NULL) {
#ifdef __FreeBSD__
printf(" country info %*D",
sp->country[1], sp->country+2, " ");
#else
int i;
printf(" country info");
for (i = 0; i < sp->country[1]; i++)
printf(" %02x", sp->country[i+2]);
#endif
}
printf("\n");
}
}
#endif /* IEEE80211_DEBUG */
static void
saveie(u_int8_t **iep, const u_int8_t *ie)
{
if (ie == NULL)
*iep = NULL;
else
ieee80211_saveie(iep, ie);
}
/*
* Process a beacon or probe response frame.
*/
void
ieee80211_add_scan(struct ieee80211com *ic,
const struct ieee80211_scanparams *sp,
const struct ieee80211_frame *wh,
int subtype, int rssi, int rstamp)
{
#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
struct ieee80211_node_table *nt = &ic->ic_scan;
struct ieee80211_node *ni;
int newnode = 0;
ni = ieee80211_find_node(nt, wh->i_addr2);
if (ni == NULL) {
/*
* Create a new entry.
*/
ni = ic->ic_node_alloc(nt);
if (ni == NULL) {
ic->ic_stats.is_rx_nodealloc++;
return;
}
ieee80211_setup_node(nt, ni, wh->i_addr2);
/*
* XXX 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_set_chan(ic, ni, ic->ic_curchan);
ni->ni_rsn = ic->ic_bss->ni_rsn;
newnode = 1;
}
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(ic) && (ic->ic_flags & IEEE80211_F_SCAN))
dump_probe_beacon(subtype, newnode, wh->i_addr2, sp);
#endif
/* XXX ap beaconing multiple ssid w/ same bssid */
if (sp->ssid[1] != 0 &&
(ISPROBE(subtype) || ni->ni_esslen == 0)) {
ni->ni_esslen = sp->ssid[1];
memset(ni->ni_essid, 0, sizeof(ni->ni_essid));
memcpy(ni->ni_essid, sp->ssid + 2, sp->ssid[1]);
}
ni->ni_scangen = ic->ic_scan.nt_scangen;
IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
memcpy(ni->ni_tstamp.data, sp->tstamp, sizeof(ni->ni_tstamp));
ni->ni_intval = sp->bintval;
ni->ni_capinfo = sp->capinfo;
ni->ni_chan = &ic->ic_channels[sp->chan];
ni->ni_fhdwell = sp->fhdwell;
ni->ni_fhindex = sp->fhindex;
ni->ni_erp = sp->erp;
if (sp->tim != NULL) {
struct ieee80211_tim_ie *ie =
(struct ieee80211_tim_ie *) sp->tim;
ni->ni_dtim_count = ie->tim_count;
ni->ni_dtim_period = ie->tim_period;
}
/*
* Record the byte offset from the mac header to
* the start of the TIM information element for
* use by hardware and/or to speedup software
* processing of beacon frames.
*/
ni->ni_timoff = sp->timoff;
/*
* Record optional information elements that might be
* used by applications or drivers.
*/
saveie(&ni->ni_wme_ie, sp->wme);
saveie(&ni->ni_wpa_ie, sp->wpa);
/* NB: must be after ni_chan is setup */
ieee80211_setup_rates(ni, sp->rates, sp->xrates, IEEE80211_F_DOSORT);
if (!newnode)
ieee80211_free_node(ni);
#undef ISPROBE
}
void
ieee80211_init_neighbor(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const struct ieee80211_scanparams *sp)
{
IEEE80211_DPRINTF(ni->ni_ic, IEEE80211_MSG_NODE,
"%s: %p<%s>\n", __func__, ni, ether_sprintf(ni->ni_macaddr));
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;
if (sp->wme != NULL)
ieee80211_saveie(&ni->ni_wme_ie, sp->wme);
if (sp->wpa != NULL)
ieee80211_saveie(&ni->ni_wpa_ie, sp->wpa);
/* 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 ieee80211com *ic,
const struct ieee80211_frame *wh,
const struct ieee80211_scanparams *sp)
{
struct ieee80211_node *ni;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"%s: mac<%s>\n", __func__, ether_sprintf(wh->i_addr2));
ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);/* XXX alloc_node? */
if (ni != NULL) {
ieee80211_init_neighbor(ni, wh, sp);
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_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)
/*
* 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
{
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);
if (ni == NULL)
ni = ieee80211_ref_node(ic->ic_bss);
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;
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;
IEEE80211_NODE_LOCK(nt);
if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax)
ni = nt->nt_keyixmap[keyix];
else
ni = NULL;
if (ni == NULL) {
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);
if (ni == NULL)
ni = ieee80211_ref_node(ic->ic_bss);
if (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_ic, 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 {
ieee80211_ref_node(ni);
}
IEEE80211_NODE_UNLOCK(nt);
return ni;
}
#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 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 (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr))
ni = ieee80211_ref_node(ic->ic_bss);
else {
ni = _ieee80211_find_node(nt, macaddr);
if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
(ni != NULL && ni->ni_associd == 0)) {
/*
* Station is not associated; don't permit the
* data frame to be sent by returning NULL. This
* is kinda a kludge but the least intrusive way
* to add this check into all drivers.
*/
ieee80211_unref_node(&ni); /* NB: null's ni */
}
}
IEEE80211_NODE_UNLOCK(nt);
if (ni == NULL) {
if (ic->ic_opmode == IEEE80211_M_IBSS ||
ic->ic_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.
*/
ni = ieee80211_fakeup_adhoc_node(nt, macaddr);
if (ni != NULL)
(void) ieee80211_ref_node(ni);
} 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,
REFCNT_LOC, ni, 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
{
#define MATCH_SSID(ni, ssid, ssidlen) \
(ni->ni_esslen == ssidlen && memcmp(ni->ni_essid, ssid, ssidlen) == 0)
static const u_int8_t zeromac[IEEE80211_ADDR_LEN];
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni;
int hash;
IEEE80211_NODE_LOCK(nt);
/*
* A mac address that is all zero means match only the ssid;
* otherwise we must match both.
*/
if (IEEE80211_ADDR_EQ(macaddr, zeromac)) {
TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
if (MATCH_SSID(ni, ssid, ssidlen))
break;
}
} else {
hash = IEEE80211_NODE_HASH(macaddr);
LIST_FOREACH(ni, &nt->nt_hash[hash], ni_hash) {
if (IEEE80211_ADDR_EQ(ni->ni_macaddr, macaddr) &&
MATCH_SSID(ni, ssid, ssidlen))
break;
}
}
if (ni != NULL) {
ieee80211_ref_node(ni); /* mark referenced */
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
REFCNT_LOC, ni, ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni));
}
IEEE80211_NODE_UNLOCK(nt);
return ni;
#undef MATCH_SSID
}
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 %p<%s> in %s table\n", __func__, ni,
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(ni->ni_ic, 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_ic, 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);
keyix = ni->ni_ucastkey.wk_rxkeyix;
status = ieee80211_crypto_delkey(ic, &ni->ni_ucastkey);
if (nt->nt_keyixmap != NULL && keyix < nt->nt_keyixmax) {
nikey = nt->nt_keyixmap[keyix];
nt->nt_keyixmap[keyix] = NULL;;
} else
nikey = NULL;
if (!isowned)
IEEE80211_NODE_UNLOCK(&ic->ic_sta);
if (nikey != NULL) {
KASSERT(nikey == ni,
("key map out of sync, ni %p nikey %p", ni, nikey));
IEEE80211_DPRINTF(ni->ni_ic, 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_ic, 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_ic, IEEE80211_MSG_NODE,
"%s: %p<%s> clear key map entry\n",
__func__, ni, ether_sprintf(ni->ni_macaddr));
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);
}
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));
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;
int isadhoc;
isadhoc = (ic->ic_opmode == IEEE80211_M_IBSS ||
ic->ic_opmode == IEEE80211_M_AHDEMO);
IEEE80211_SCAN_LOCK(nt);
gen = ++nt->nt_scangen;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
"%s: %s scangen %u\n", __func__, nt->nt_name, 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;
/*
* 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).
*/
if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
(ni->ni_flags & IEEE80211_NODE_AREF) == 0)
continue;
/*
* 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;
}
/*
* Special case ourself; we may be idle for extended periods
* of time and regardless reclaiming our state is wrong.
*/
if (ni == ic->ic_bss)
continue;
ni->ni_inact--;
if (ni->ni_associd != 0 || isadhoc) {
/*
* 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(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_NOTE(ic,
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 (ni->ni_inact <= 0) {
IEEE80211_NOTE(ic,
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 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;
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[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("\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;
}
if (ic->ic_nonerpsta == 1)
ic->ic_flags_ext |= IEEE80211_FEXT_ERPUPDATE;
} 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 &&
IEEE80211_IS_CHAN_FULL(ni->ni_chan))
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(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,
("not in 11g, bss %u:0x%x, curmode %u", ni->ni_chan->ic_freq,
ni->ni_chan->ic_flags, 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;
}
ic->ic_flags_ext |= IEEE80211_FEXT_ERPUPDATE;
}
}
}
/*
* Handle bookkeeping for station deauthentication/disassociation
* when operating as an ap.
*/
void
ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
{
struct ieee80211_node_table *nt = ni->ni_table;
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 &&
IEEE80211_IS_CHAN_FULL(ni->ni_chan))
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:
/*
* 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);
}
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 */
/* XXX locking */
TAILQ_FOREACH(ni, &nt->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 */
/* XXX locking */
TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
rssi_samples++;
rssi_total += ic->ic_node_getrssi(ni);
}
break;
case IEEE80211_M_HOSTAP: /* average of all associated stations */
/* XXX locking */
TAILQ_FOREACH(ni, &nt->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 ieee80211_node *ni, int set)
{
struct ieee80211com *ic = ni->ni_ic;
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, int keyixmax,
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;
nt->nt_keyixmax = keyixmax;
if (nt->nt_keyixmax > 0) {
MALLOC(nt->nt_keyixmap, struct ieee80211_node **,
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;
}
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_NODE_LOCK(nt);
ieee80211_free_allnodes_locked(nt);
if (nt->nt_keyixmap != NULL) {
/* 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);
FREE(nt->nt_keyixmap, M_80211_NODE);
nt->nt_keyixmap = NULL;
}
IEEE80211_SCAN_LOCK_DESTROY(nt);
IEEE80211_NODE_LOCK_DESTROY(nt);
}
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