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madwifi/net80211/ieee80211_node.c

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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.
*
* $Id$
*/
#ifndef EXPORT_SYMTAB
#define EXPORT_SYMTAB
#endif
/*
* IEEE 802.11 node handling support.
*/
#if !defined(AUTOCONF_INCLUDED) && !defined(CONFIG_LOCALVERSION)
#include <linux/config.h>
#endif
#include <linux/version.h>
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/random.h>
#include "if_media.h"
#include <net80211/ieee80211_var.h>
#include <net80211/if_athproto.h>
/*
* Association IDs are managed with a bit vector.
*/
#define IEEE80211_AID_SET(_vap, _b) \
((_vap)->iv_aid_bitmap[IEEE80211_AID(_b) / 32] |= \
(1 << (IEEE80211_AID(_b) % 32)))
#define IEEE80211_AID_CLR(_vap, _b) \
((_vap)->iv_aid_bitmap[IEEE80211_AID(_b) / 32] &= \
~(1 << (IEEE80211_AID(_b) % 32)))
#define IEEE80211_AID_ISSET(_vap, _b) \
((_vap)->iv_aid_bitmap[IEEE80211_AID(_b) / 32] & \
(1 << (IEEE80211_AID(_b) % 32)))
static struct ieee80211_node *ieee80211_alloc_node(struct ieee80211vap *,
const u_int8_t *);
static int ieee80211_sta_join1(struct ieee80211_node *);
static struct ieee80211_node *node_alloc(struct ieee80211vap *);
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 node_table_leave_locked(struct ieee80211_node_table *,
struct ieee80211_node *);
static void node_table_join_locked(struct ieee80211_node_table *,
struct ieee80211_node *);
static void ieee80211_node_timeout(unsigned long);
static void ieee80211_node_table_init(struct ieee80211com *,
struct ieee80211_node_table *, const char *, int);
static void ieee80211_node_table_cleanup(struct ieee80211_node_table *);
static void ieee80211_node_table_reset(struct ieee80211_node_table *,
struct ieee80211vap *);
static void ieee80211_node_wds_ageout(unsigned long);
MALLOC_DEFINE(M_80211_NODE, "80211node", "802.11 node state");
void
ieee80211_node_attach(struct ieee80211com *ic)
{
ieee80211_node_table_init(ic, &ic->ic_sta, "station",
IEEE80211_INACT_INIT);
init_timer(&ic->ic_inact);
ic->ic_inact.function = ieee80211_node_timeout;
ic->ic_inact.data = (unsigned long) ic;
mod_timer(&ic->ic_inact, jiffies + IEEE80211_INACT_WAIT * HZ);
ic->ic_node_alloc = node_alloc;
ic->ic_node_free = node_free;
ic->ic_node_cleanup = node_cleanup;
ic->ic_node_getrssi = node_getrssi;
}
void
ieee80211_node_detach(struct ieee80211com *ic)
{
del_timer(&ic->ic_inact);
ieee80211_node_table_cleanup(&ic->ic_sta);
}
void
ieee80211_node_vattach(struct ieee80211vap *vap)
{
/* default station inactivity timer setings */
vap->iv_inact_init = IEEE80211_INACT_INIT;
vap->iv_inact_auth = IEEE80211_INACT_AUTH;
vap->iv_inact_run = IEEE80211_INACT_RUN;
vap->iv_inact_probe = IEEE80211_INACT_PROBE;
}
void
ieee80211_node_latevattach(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_rsnparms *rsn;
/*
* Allocate these only if needed. Beware that we
* know adhoc mode doesn't support ATIM yet...
*/
if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
if (vap->iv_max_aid == 0)
vap->iv_max_aid = IEEE80211_AID_DEF;
else if (vap->iv_max_aid > IEEE80211_AID_MAX)
vap->iv_max_aid = IEEE80211_AID_MAX;
MALLOC(vap->iv_aid_bitmap, u_int32_t *,
howmany(vap->iv_max_aid, 32) * sizeof(u_int32_t),
M_DEVBUF, M_NOWAIT | M_ZERO);
if (vap->iv_aid_bitmap == NULL) {
/* XXX no way to recover */
printk(KERN_ERR "%s: no memory for AID bitmap!\n", __func__);
vap->iv_max_aid = 0;
}
}
ieee80211_reset_bss(vap);
/*
* Setup "global settings" in the bss node so that
* each new station automatically inherits them.
*/
rsn = &vap->iv_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;
vap->iv_auth = ieee80211_authenticator_get(vap->iv_bss->ni_authmode);
}
void
ieee80211_node_vdetach(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
ieee80211_node_table_reset(&ic->ic_sta, vap);
if (vap->iv_bss != NULL) {
ieee80211_unref_node(&vap->iv_bss);
}
if (vap->iv_aid_bitmap != NULL) {
FREE(vap->iv_aid_bitmap, M_DEVBUF);
vap->iv_aid_bitmap = NULL;
}
}
/* Port authorize/unauthorize interfaces for use by an authenticator. */
void
ieee80211_node_authorize(struct ieee80211_node *ni)
{
ni->ni_flags |= IEEE80211_NODE_AUTH;
ni->ni_inact_reload = ni->ni_vap->iv_inact_run;
}
EXPORT_SYMBOL(ieee80211_node_authorize);
void
ieee80211_node_unauthorize(struct ieee80211_node *ni)
{
ni->ni_flags &= ~IEEE80211_NODE_AUTH;
}
EXPORT_SYMBOL(ieee80211_node_unauthorize);
/*
* Set/change the channel. The rate set is also updated
* to ensure a consistent view by drivers.
*/
static __inline void
ieee80211_node_set_chan(struct ieee80211com *ic, struct ieee80211_node *ni)
{
struct ieee80211_channel *chan = ic->ic_bsschan;
KASSERT(chan != IEEE80211_CHAN_ANYC, ("bss channel not setup"));
ni->ni_chan = chan;
#ifdef ATH_SUPERG_XR
if (ni->ni_vap->iv_flags & IEEE80211_F_XR)
ni->ni_rates = ic->ic_sup_xr_rates;
else
#endif
ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(chan)];
}
static __inline void
copy_bss_state(struct ieee80211_node *nbss, const struct ieee80211_node *obss)
{
/* propagate useful state */
nbss->ni_authmode = obss->ni_authmode;
nbss->ni_ath_flags = obss->ni_ath_flags;
nbss->ni_txpower = obss->ni_txpower;
nbss->ni_vlan = obss->ni_vlan;
nbss->ni_rsn = obss->ni_rsn;
nbss->ni_rates = obss->ni_rates;
/* XXX statistics? */
}
void
ieee80211_create_ibss(struct ieee80211vap *vap, struct ieee80211_channel *chan)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
"%s: creating ibss on channel %u\n", __func__,
ieee80211_chan2ieee(ic, chan));
/* Check to see if we already have a node for this mac
* NB: we gain a node reference here
*/
ni = ieee80211_find_node(&ic->ic_sta, vap->iv_myaddr);
if (ni == NULL) {
ni = ieee80211_alloc_node_table(vap, vap->iv_myaddr);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: ni:%p allocated for " MAC_FMT "\n",
__func__, ni, MAC_ADDR(vap->iv_myaddr));
if (ni == NULL) {
/* XXX recovery? */
return;
}
}
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_myaddr);
IEEE80211_ADDR_COPY(vap->iv_bssid, vap->iv_myaddr);
ni->ni_esslen = vap->iv_des_ssid[0].len;
memcpy(ni->ni_essid, vap->iv_des_ssid[0].ssid, ni->ni_esslen);
if (vap->iv_bss != NULL)
copy_bss_state(ni, vap->iv_bss);
ni->ni_intval = ic->ic_lintval;
#ifdef ATH_SUPERG_XR
if (vap->iv_flags & IEEE80211_F_XR) {
ni->ni_intval *= IEEE80211_XR_BEACON_FACTOR;
}
#endif
if (vap->iv_flags & IEEE80211_F_PRIVACY)
ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
if (ic->ic_phytype == IEEE80211_T_FH) {
ni->ni_fhdwell = 200; /* XXX */
ni->ni_fhindex = 1;
}
if (vap->iv_opmode == IEEE80211_M_IBSS) {
vap->iv_flags |= IEEE80211_F_SIBSS;
ni->ni_capinfo |= IEEE80211_CAPINFO_IBSS; /* XXX */
if (vap->iv_flags & IEEE80211_F_DESBSSID) {
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
IEEE80211_ADDR_COPY(vap->iv_bssid, vap->iv_des_bssid);
} else {
ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */
vap->iv_bssid[0] |= 0x02;
}
} else if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
if (vap->iv_flags & IEEE80211_F_DESBSSID) {
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_des_bssid);
IEEE80211_ADDR_COPY(vap->iv_bssid, vap->iv_des_bssid);
} else {
IEEE80211_ADDR_SET_NULL(ni->ni_bssid);
IEEE80211_ADDR_SET_NULL(vap->iv_bssid);
}
}
#ifdef ATH_SUPERG_DYNTURBO
if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
ni->ni_ath_flags = vap->iv_ath_cap;
/*
* no dynamic turbo and AR on a static turbo channel.
* no dynamic turbo and AR on non-turbo channel.
* no AR on 5GHZ channel .
*/
if (IEEE80211_IS_CHAN_STURBO(chan) ||
!ieee80211_find_channel(ic, chan->ic_freq, chan->ic_flags | IEEE80211_CHAN_TURBO))
ni->ni_ath_flags &= ~(IEEE80211_ATHC_TURBOP | IEEE80211_ATHC_AR);
if (IEEE80211_IS_CHAN_5GHZ(chan))
ni->ni_ath_flags &= ~IEEE80211_ATHC_AR;
}
#endif
/*
* Fix the channel and related attributes.
*/
ic->ic_bsschan = chan;
ieee80211_node_set_chan(ic, ni);
ic->ic_curmode = ieee80211_chan2mode(chan);
/* Update country ie information */
ieee80211_build_countryie(ic);
if (IEEE80211_IS_CHAN_HALF(chan))
ni->ni_rates = ic->ic_sup_half_rates;
else if (IEEE80211_IS_CHAN_QUARTER(chan))
ni->ni_rates = ic->ic_sup_quarter_rates;
(void) ieee80211_sta_join1(PASS_NODE(ni));
}
EXPORT_SYMBOL(ieee80211_create_ibss);
/*
* Reset bss state on transition to the INIT state.
* Clear any stations from the table (they have been
* deauth'd) and reset the bss node (clears key, rate,
* etc. state).
*/
void
ieee80211_reset_bss(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni = NULL;
struct ieee80211_node *obss = vap->iv_bss;
/* Recreate the node table */
ieee80211_node_table_reset(&ic->ic_sta, vap);
/* XXX multi-bss wrong */
ieee80211_reset_erp(ic, ic->ic_curmode);
ni = ieee80211_alloc_node_table(vap, vap->iv_myaddr);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: ni:%p allocated for " MAC_FMT "\n",
__func__, ni, MAC_ADDR(vap->iv_myaddr));
KASSERT(ni != NULL, ("unable to setup initial BSS node"));
vap->iv_bss = PASS_NODE(ni);
KASSERT((atomic_read(&vap->iv_bss->ni_refcnt) == 2),
("wrong refcount for new node."));
if (obss != NULL) {
copy_bss_state(vap->iv_bss, obss);
vap->iv_bss->ni_intval = ic->ic_lintval;
/* Caller's reference */
ieee80211_unref_node(&obss);
}
}
static int
match_ssid(const struct ieee80211_node *ni,
int nssid, const struct ieee80211_scan_ssid ssids[])
{
int i;
for (i = 0; i < nssid; i++) {
if (ni->ni_esslen == ssids[i].len &&
memcmp(ni->ni_essid, ssids[i].ssid, ni->ni_esslen) == 0)
return 1;
}
return 0;
}
/*
* Test a node for suitability/compatibility.
*/
static int
check_bss(struct ieee80211vap *vap, struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
u_int8_t rate;
if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
return 0;
if (vap->iv_opmode == IEEE80211_M_IBSS) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
return 0;
} else {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
return 0;
}
if (vap->iv_flags & IEEE80211_F_PRIVACY) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
return 0;
} else {
/* Reference: IEEE802.11 7.3.1.4
* This means that the data confidentiality service is required
* for all frames exchanged with this STA in IBSS and for all
* frames exchanged within the entire BSS otherwise
*/
if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
return 0;
}
rate = ieee80211_fix_rate(ni, IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
if (rate & IEEE80211_RATE_BASIC)
return 0;
if (vap->iv_des_nssid != 0 &&
!match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
return 0;
if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
!IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
return 0;
return 1;
}
#ifdef IEEE80211_DEBUG
/*
* Display node suitability/compatibility.
*/
static void
check_bss_debug(struct ieee80211vap *vap, struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
u_int8_t rate;
int fail;
fail = 0;
if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
fail |= 0x01;
if (vap->iv_opmode == IEEE80211_M_IBSS) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
fail |= 0x02;
} else {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
fail |= 0x02;
}
if (vap->iv_flags & IEEE80211_F_PRIVACY) {
if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
fail |= 0x04;
} else {
/* This means that the data confidentiality service is required
* for all frames exchanged within this BSS. (IEEE802.11 7.3.1.4)
*/
if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
fail |= 0x04;
}
rate = ieee80211_fix_rate(ni, IEEE80211_F_DONEGO | IEEE80211_F_DOFRATE);
if (rate & IEEE80211_RATE_BASIC)
fail |= 0x08;
if (vap->iv_des_nssid != 0 &&
!match_ssid(ni, vap->iv_des_nssid, vap->iv_des_ssid))
fail |= 0x10;
if ((vap->iv_flags & IEEE80211_F_DESBSSID) &&
!IEEE80211_ADDR_EQ(vap->iv_des_bssid, ni->ni_bssid))
fail |= 0x20;
printk(" %c " MAC_FMT, fail ? '-' : '+', MAC_ADDR(ni->ni_macaddr));
printk(" " MAC_FMT "%c", MAC_ADDR(ni->ni_bssid), fail & 0x20 ? '!' : ' ');
printk(" %3d%c",
ieee80211_chan2ieee(ic, ni->ni_chan), fail & 0x01 ? '!' : ' ');
printk(" %+4d", ni->ni_rssi);
printk(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
fail & 0x08 ? '!' : ' ');
printk(" %4s%c",
(ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
(ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
"????",
fail & 0x02 ? '!' : ' ');
printk(" %3s%c ",
(ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ? "wep" : "no",
fail & 0x04 ? '!' : ' ');
ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
printk("%s\n", fail & 0x10 ? "!" : "");
}
#endif /* IEEE80211_DEBUG */
/*
* Handle 802.11 ad hoc network merge. The
* convention, set by the Wireless Ethernet Compatibility Alliance
* (WECA), is that an 802.11 station will change its BSSID to match
* the "oldest" 802.11 ad hoc network, on the same channel, that
* has the station's desired SSID. The "oldest" 802.11 network
* sends beacons with the greatest TSF timestamp.
*
* The caller is assumed to validate TSFs before attempting a merge.
*
* Return !0 if the BSSID changed, 0 otherwise.
*/
int
ieee80211_ibss_merge(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
#ifdef IEEE80211_DEBUG
struct ieee80211com *ic = ni->ni_ic;
#endif
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: ni:%p[" MAC_FMT "] iv_bss:%p[" MAC_FMT "]\n",
__func__, ni, MAC_ADDR(ni->ni_macaddr),
vap->iv_bss, MAC_ADDR(vap->iv_bss->ni_macaddr));
if (!check_bss(vap, ni)) {
/* capabilities mismatch */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: merge failed, capabilities mismatch\n", __func__);
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_assoc(vap))
check_bss_debug(vap, ni);
#endif
vap->iv_stats.is_ibss_capmismatch++;
return 0;
}
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: new bssid " MAC_FMT ": %s preamble, %s slot time%s\n", __func__,
MAC_ADDR(ni->ni_bssid),
ic->ic_flags & IEEE80211_F_SHPREAMBLE ? "short" : "long",
ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "");
return ieee80211_sta_join1(ieee80211_ref_node(ni));
}
EXPORT_SYMBOL(ieee80211_ibss_merge);
static __inline int
ssid_equal(const struct ieee80211_node *a, const struct ieee80211_node *b)
{
return (a->ni_esslen == b->ni_esslen &&
memcmp(a->ni_essid, b->ni_essid, a->ni_esslen) == 0);
}
/*
* Join the specified IBSS/BSS network. The node is assumed to
* be passed in with a reference already held for use in assigning
* to iv_bss. Returns 1 on success, 0 on failure.
*/
static int
ieee80211_sta_join1(struct ieee80211_node *selbs)
{
struct ieee80211vap *vap = selbs->ni_vap;
struct ieee80211com *ic = selbs->ni_ic;
struct ieee80211_node *ni_bss = vap->iv_bss;
struct ieee80211_node *obss;
int canreassoc;
/* Check vap->iv_bss at the beginning */
if (ni_bss == NULL) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: BUG: ni_bss is NULL\n",
__func__);
return 0;
}
if (vap->iv_opmode == IEEE80211_M_IBSS) {
/*
* Delete unusable rates; we've already checked
* that the negotiated rate set is acceptable.
*/
ieee80211_fix_rate(selbs, IEEE80211_F_DODEL);
}
/*
* Committed to selbs, setup state.
*/
obss = vap->iv_bss;
/*
* Check if old+new node have the same ssid in which
* case we can reassociate when operating in sta mode.
*/
canreassoc = ((obss != NULL) &&
(vap->iv_state == IEEE80211_S_RUN) && ssid_equal(obss, selbs));
/*
* In IBSS mode, updates vap->iv_bss content from selbs. In other
* modes, set vap->iv_bss = selbs
*/
if (vap->iv_opmode == IEEE80211_M_IBSS) {
IEEE80211_ADDR_COPY(vap->iv_bssid, selbs->ni_bssid);
IEEE80211_ADDR_COPY(ni_bss->ni_bssid, selbs->ni_bssid);
/* FIXME : ni_tstamp should be updated with value from beacons
* only, not from probe responses since ni_tstamp is used to
* synchronize beacons transmission in ath_beacon_config() */
ni_bss->ni_tstamp.tsf = selbs->ni_tstamp.tsf;
ni_bss->ni_intval = selbs->ni_intval;
ni_bss->ni_capinfo = selbs->ni_capinfo;
ni_bss->ni_chan = selbs->ni_chan;
/* Since ESSID matches, we don't need to update it */
ni_bss->ni_fhdwell = selbs->ni_fhdwell;
ni_bss->ni_fhindex = selbs->ni_fhindex;
ni_bss->ni_erp = selbs->ni_erp;
ni_bss->ni_timoff = selbs->ni_timoff;
if (selbs->ni_wme_ie != NULL)
ieee80211_saveie(&ni_bss->ni_wme_ie, selbs->ni_wme_ie);
if (selbs->ni_wpa_ie != NULL)
ieee80211_saveie(&ni_bss->ni_wpa_ie, selbs->ni_wpa_ie);
if (selbs->ni_rsn_ie != NULL)
ieee80211_saveie(&ni_bss->ni_rsn_ie, selbs->ni_rsn_ie);
if (selbs->ni_ath_ie != NULL)
ieee80211_saveath(ni_bss, selbs->ni_ath_ie);
ni_bss->ni_rates = selbs->ni_rates;
/* We got a reference to selbs, so need to unref() */
ieee80211_unref_node(&selbs);
} else {
vap->iv_bss = selbs;
IEEE80211_ADDR_COPY(vap->iv_bssid, selbs->ni_bssid);
if (obss != NULL)
ieee80211_unref_node(&obss);
}
ic->ic_bsschan = vap->iv_bss->ni_chan;
ic->ic_curchan = ic->ic_bsschan;
ic->ic_curmode = ieee80211_chan2mode(ic->ic_curchan);
ic->ic_set_channel(ic);
/*
* 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, ic->ic_curmode);
ieee80211_wme_initparams(vap);
if (vap->iv_opmode == IEEE80211_M_STA) {
/*
* Act as if we received a DEAUTH frame in case we are
* invoked from the RUN state. This will cause us to try
* to re-authenticate if we are operating as a station.
*/
if (canreassoc) {
vap->iv_nsparams.newstate = IEEE80211_S_ASSOC;
vap->iv_nsparams.arg = IEEE80211_FC0_SUBTYPE_REASSOC_REQ;
IEEE80211_SCHEDULE_TQUEUE(&vap->iv_stajoin1tq);
} else {
vap->iv_nsparams.newstate = IEEE80211_S_AUTH;
vap->iv_nsparams.arg = IEEE80211_FC0_SUBTYPE_DEAUTH;
IEEE80211_SCHEDULE_TQUEUE(&vap->iv_stajoin1tq);
}
} else {
vap->iv_nsparams.newstate = IEEE80211_S_RUN;
vap->iv_nsparams.arg = -1;
IEEE80211_SCHEDULE_TQUEUE(&vap->iv_stajoin1tq);
}
return 1;
}
void
ieee80211_sta_join1_tasklet(IEEE80211_TQUEUE_ARG data)
{
struct ieee80211vap *vap= (struct ieee80211vap *)data;
int rc;
rc = ieee80211_new_state(vap, vap->iv_nsparams.newstate, vap->iv_nsparams.arg);
vap->iv_nsparams.result = rc;
vap->iv_nsdone = 1;
}
EXPORT_SYMBOL(ieee80211_sta_join1_tasklet);
int
ieee80211_sta_join(struct ieee80211vap *vap,
const struct ieee80211_scan_entry *se)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
ni = ieee80211_find_node(&ic->ic_sta, se->se_macaddr);
if (ni == NULL) {
ni = ieee80211_alloc_node_table(vap, se->se_macaddr);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: ni:%p allocated for " MAC_FMT "\n",
__func__, ni, MAC_ADDR(se->se_macaddr));
if (ni == NULL) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"%s: Unable to allocate node for BSS: " MAC_FMT "\n", __func__,
MAC_ADDR(se->se_macaddr));
return 0;
}
}
/*
* Expand scan state into node's format.
* XXX may not need all this stuff
*/
ni->ni_authmode = vap->iv_bss->ni_authmode; /* inherit authmode from iv_bss */
/* inherit the WPA setup as well (structure copy!) */
ni->ni_rsn = vap->iv_bss->ni_rsn;
IEEE80211_ADDR_COPY(ni->ni_bssid, se->se_bssid);
ni->ni_esslen = se->se_ssid[1];
memcpy(ni->ni_essid, se->se_ssid + 2, ni->ni_esslen);
ni->ni_rtsf = se->se_rtsf;
ni->ni_tstamp.tsf = se->se_tstamp.tsf;
ni->ni_intval = IEEE80211_BINTVAL_SANITISE(se->se_intval);
ni->ni_capinfo = se->se_capinfo;
ni->ni_chan = se->se_chan;
ni->ni_timoff = se->se_timoff;
ni->ni_fhdwell = se->se_fhdwell;
ni->ni_fhindex = se->se_fhindex;
ni->ni_erp = se->se_erp;
ni->ni_rssi = se->se_rssi;
if (se->se_wpa_ie != NULL)
ieee80211_saveie(&ni->ni_wpa_ie, se->se_wpa_ie);
if (se->se_rsn_ie != NULL)
ieee80211_saveie(&ni->ni_rsn_ie, se->se_rsn_ie);
if (se->se_wme_ie != NULL)
ieee80211_saveie(&ni->ni_wme_ie, se->se_wme_ie);
if (se->se_ath_ie != NULL)
ieee80211_saveath(ni, se->se_ath_ie);
vap->iv_dtim_period = se->se_dtimperiod;
vap->iv_dtim_count = 0;
/* NB: must be after ni_chan is setup */
ieee80211_setup_rates(ni, se->se_rates, se->se_xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
return ieee80211_sta_join1(PASS_NODE(ni));
}
EXPORT_SYMBOL(ieee80211_sta_join);
/*
* Leave the specified IBSS/BSS network. The node is assumed to
* be passed in with a held reference.
*/
void
ieee80211_sta_leave(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
/* WDS/Repeater: Stop software beacon timer for STA */
if ((vap->iv_opmode == IEEE80211_M_STA) &&
(vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)) {
del_timer(&vap->iv_swbmiss);
}
ieee80211_notify_node_leave(ni);
}
/*
* Node table support.
*/
static void
ieee80211_node_table_init(struct ieee80211com *ic,
struct ieee80211_node_table *nt, const char *name, int inact)
{
nt->nt_ic = ic;
IEEE80211_NODE_TABLE_LOCK_INIT(nt, ic->ic_dev->name);
IEEE80211_SCAN_LOCK_INIT(nt, ic->ic_dev->name);
TAILQ_INIT(&nt->nt_node);
nt->nt_name = name;
nt->nt_scangen = 1;
nt->nt_inact_init = inact;
init_timer(&nt->nt_wds_aging_timer);
nt->nt_wds_aging_timer.function = ieee80211_node_wds_ageout;
nt->nt_wds_aging_timer.data = (unsigned long) nt;
mod_timer(&nt->nt_wds_aging_timer, jiffies + HZ * WDS_AGING_TIMER_VAL);
}
static __inline void
node_table_join_locked(struct ieee80211_node_table *nt,
struct ieee80211_node *ni)
{
struct ieee80211_node *tni = NULL;
IEEE80211_NODE_TABLE_LOCK_ASSERT(nt);
ni->ni_table = nt;
tni = ieee80211_ref_node(ni);
TAILQ_INSERT_TAIL(&nt->nt_node, tni, ni_list);
tni = NULL;
LIST_INSERT_HEAD(&nt->nt_hash[IEEE80211_NODE_HASH(ni->ni_macaddr)],
ni, ni_hash);
}
static __inline void
node_table_leave_locked(struct ieee80211_node_table *nt,
struct ieee80211_node *ni)
{
struct ieee80211_node *hni;
IEEE80211_NODE_TABLE_LOCK_ASSERT(nt);
TAILQ_REMOVE(&nt->nt_node, ni, ni_list);
LIST_FOREACH(hni, &nt->nt_hash[IEEE80211_NODE_HASH(ni->ni_macaddr)],
ni_hash) {
LIST_REMOVE(ni, ni_hash);
}
ni->ni_table = NULL;
ieee80211_unref_node(&ni);
}
/* This is overridden by ath_node_alloc in ath/if_ath.c, and so
* should never get called. */
static struct ieee80211_node *
node_alloc(struct ieee80211vap *vap)
{
struct ieee80211_node *ni;
MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node),
M_80211_NODE, M_NOWAIT | M_ZERO);
printk(KERN_ERR "%s: ERROR, this function should never be called!",
__func__);
dump_stack();
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 ensure consistent state (should probably fix that).
*
* Context: hwIRQ, softIRQ and process context
*/
static void
node_cleanup(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
/* NB: preserve ni_table */
if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) {
if (vap->iv_opmode != IEEE80211_M_STA)
vap->iv_ps_sta--;
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
#ifdef IEEE80211_DEBUG_REFCNT
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"Power save mode off, %u STAs in PS mode",
vap->iv_ps_sta);
#endif
if (ni->ni_flags & IEEE80211_NODE_UAPSD_TRIG) {
ni->ni_flags &= ~IEEE80211_NODE_UAPSD_TRIG;
IEEE80211_LOCK_IRQ(ni->ni_ic);
ni->ni_ic->ic_uapsdmaxtriggers--;
IEEE80211_UNLOCK_IRQ(ni->ni_ic);
}
}
/* Drain power save queue and, if needed, clear TIM. */
if (ieee80211_node_saveq_drain(ni) != 0 && vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 0);
ni->ni_associd = 0;
/*
* Preserve SSID, WPA, and WME IEs 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?
*/
if (ni->ni_rxfrag != NULL)
ieee80211_dev_kfree_skb(&ni->ni_rxfrag);
ieee80211_crypto_delkey(vap, &ni->ni_ucastkey, ni);
ni->ni_rxkeyoff = 0;
}
#ifdef IEEE80211_DEBUG
static void
node_print_message(
u_int32_t flags,
int show_counter,
int refcnt_adjust,
const struct ieee80211_node *ni,
const char *message,
...)
{
va_list args;
int adjusted_refcount = atomic_read(&ni->ni_refcnt) + refcnt_adjust;
char node_count[10] = { '\0' };
char expanded_message[192] = { '\0' };
if (0 == (ni->ni_ic->ic_debug & flags))
return;
if (adjusted_refcount == 0)
show_counter = 1;
if (show_counter) {
snprintf(node_count,
sizeof(node_count),
"[#NODES=%05d] ",
atomic_read(&ni->ni_ic->ic_node_counter));
}
va_start(args, message);
vsnprintf(expanded_message, sizeof(expanded_message), message, args);
printk(KERN_DEBUG "%s/%s: %s %s [node %p<" MAC_FMT ">%s%s%s%s, refs=%02d]\n",
ni->ni_ic->ic_dev->name,
ni->ni_vap->iv_dev->name,
node_count,
expanded_message,
ni, MAC_ADDR(ni->ni_macaddr),
ni->ni_table != NULL ? " in " : "",
ni->ni_table != NULL ? ni->ni_table->nt_name : "",
ni->ni_table != NULL ? " table" : "",
ni->ni_table != NULL ? "" : " (not in any tables)",
adjusted_refcount);
va_end(args);
}
#else
# define node_print_message(...)
#endif
static void
node_free(struct ieee80211_node *ni)
{
KASSERT(atomic_read(&ni->ni_refcnt) == 0,
("node being free whilst still referenced"));
if (ni->ni_challenge != NULL)
FREE(ni->ni_challenge, M_DEVBUF);
if (ni->ni_wpa_ie != NULL)
FREE(ni->ni_wpa_ie, M_DEVBUF);
if (ni->ni_rsn_ie != NULL)
FREE(ni->ni_rsn_ie, M_DEVBUF);
if (ni->ni_wme_ie != NULL)
FREE(ni->ni_wme_ie, M_DEVBUF);
if (ni->ni_ath_ie != NULL)
FREE(ni->ni_ath_ie, M_DEVBUF);
if (ni->ni_suppchans != NULL)
FREE(ni->ni_suppchans, M_DEVBUF);
if (ni->ni_suppchans_new != NULL)
FREE(ni->ni_suppchans_new, M_DEVBUF);
if (ni->ni_needed_chans != NULL)
FREE(ni->ni_needed_chans, 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;
}
/*
* Create an entry in the specified node table. The node
* is setup with the mac address, an initial reference count,
* and some basic parameters obtained from global state.
* This interface is not intended for general use, it is
* used by the routines below to create entries with a
* specific purpose.
* Dont assume a BSS?
* Allocates a new struct ieee80211_node that has a reference
* count of one, and adds it to the node table.
*/
struct ieee80211_node *
ieee80211_alloc_node_table(struct ieee80211vap *vap,
const u_int8_t *macaddr)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node_table *nt = &ic->ic_sta;
struct ieee80211_node *ni;
ni = ieee80211_alloc_node(vap, macaddr);
if (ni != NULL) {
ni->ni_inact = ni->ni_inact_reload = nt->nt_inact_init;
WME_UAPSD_NODE_TRIGSEQINIT(ni);
IEEE80211_NODE_SAVEQ_INIT(ni, "unknown");
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
node_table_join_locked(nt, ni);
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
}
else {
printk(KERN_ERR "Failed to allocate node for " MAC_FMT ".\n",
MAC_ADDR(macaddr));
}
return ni;
}
EXPORT_SYMBOL(ieee80211_alloc_node_table);
/* Allocate a node structure and initialise specialised structures
* This function does not add the node to the node table, thus this
* node will not be found using ieee80211_find_*node.
* This is useful when sending one off errors or request denials.
*/
static struct ieee80211_node *
ieee80211_alloc_node(struct ieee80211vap *vap, const u_int8_t *macaddr)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
/* This always allocates zeroed memoery */
ni = ic->ic_node_alloc(vap);
if (ni != NULL) {
atomic_set(&ni->ni_refcnt, 1);
IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
ni->ni_chan = IEEE80211_CHAN_ANYC;
ni->ni_authmode = IEEE80211_AUTH_OPEN;
ni->ni_txpower = ic->ic_txpowlimit;
ieee80211_crypto_resetkey(vap, &ni->ni_ucastkey,
IEEE80211_KEYIX_NONE);
ni->ni_ath_defkeyindex = IEEE80211_INVAL_DEFKEY;
ni->ni_vap = vap;
ni->ni_ic = ic;
atomic_inc(&ni->ni_ic->ic_node_counter);
node_print_message(IEEE80211_MSG_NODE | IEEE80211_MSG_NODE_REF,
1 /* show counter */,
0 /* adjust refcount */,
ni,
"alloc" /* message */);
} else {
/* XXX msg */
vap->iv_stats.is_rx_nodealloc++;
}
return ni;
}
/* Add wds address to the node table. */
int
ieee80211_add_wds_addr(struct ieee80211_node_table *nt,
struct ieee80211_node *ni, const u_int8_t *macaddr, u_int8_t wds_static)
{
int hash;
struct ieee80211_wds_addr *wds;
MALLOC(wds, struct ieee80211_wds_addr *,
sizeof(struct ieee80211_wds_addr),
M_80211_WDS, M_NOWAIT | M_ZERO);
if (wds == NULL) {
/* XXX msg */
return 1;
}
if (wds_static)
wds->wds_agingcount = WDS_AGING_STATIC;
else
wds->wds_agingcount = WDS_AGING_COUNT;
hash = IEEE80211_NODE_HASH(macaddr);
IEEE80211_ADDR_COPY(wds->wds_macaddr, macaddr);
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
wds->wds_ni = ieee80211_ref_node(ni);
LIST_INSERT_HEAD(&nt->nt_wds_hash[hash], wds, wds_hash);
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
return 0;
}
EXPORT_SYMBOL(ieee80211_add_wds_addr);
/* remove wds address from the wds hash table */
void
ieee80211_remove_wds_addr(struct ieee80211_node_table *nt,
const u_int8_t *macaddr)
{
int hash;
struct ieee80211_wds_addr *wds, *twds;
hash = IEEE80211_NODE_HASH(macaddr);
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
LIST_FOREACH_SAFE(wds, &nt->nt_wds_hash[hash], wds_hash, twds) {
if (IEEE80211_ADDR_EQ(wds->wds_macaddr, macaddr)) {
LIST_REMOVE(wds, wds_hash);
ieee80211_unref_node(&wds->wds_ni);
FREE(wds, M_80211_WDS);
break;
}
}
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
}
EXPORT_SYMBOL(ieee80211_remove_wds_addr);
/* Remove node references from wds table */
void
ieee80211_del_wds_node(struct ieee80211_node_table *nt,
struct ieee80211_node *ni)
{
int hash;
struct ieee80211_wds_addr *wds, *twds;
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
for (hash = 0; hash < IEEE80211_NODE_HASHSIZE; hash++) {
LIST_FOREACH_SAFE(wds, &nt->nt_wds_hash[hash], wds_hash, twds) {
if (wds->wds_ni == ni) {
LIST_REMOVE(wds, wds_hash);
ieee80211_unref_node(&wds->wds_ni);
FREE(wds, M_80211_WDS);
}
}
}
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
}
EXPORT_SYMBOL(ieee80211_del_wds_node);
static void
ieee80211_node_wds_ageout(unsigned long data)
{
struct ieee80211_node_table *nt = (struct ieee80211_node_table *)data;
int hash;
struct ieee80211_wds_addr *wds, *twds;
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
for (hash = 0; hash < IEEE80211_NODE_HASHSIZE; hash++) {
LIST_FOREACH_SAFE(wds, &nt->nt_wds_hash[hash], wds_hash, twds) {
if (wds->wds_agingcount != WDS_AGING_STATIC) {
if (!wds->wds_agingcount) {
LIST_REMOVE(wds, wds_hash);
ieee80211_unref_node(&wds->wds_ni);
FREE(wds, M_80211_WDS);
} else
wds->wds_agingcount--;
}
}
}
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
mod_timer(&nt->nt_wds_aging_timer, jiffies + HZ * WDS_AGING_TIMER_VAL);
}
/* Add the specified station to the station table.
* Allocates a new struct ieee80211_node that has a reference count of one
* If tmp is 0, it is added to the node table and the reference is used.
* If tmp is 1, then the caller gets to use the reference. */
struct ieee80211_node *
ieee80211_dup_bss(struct ieee80211vap *vap, const u_int8_t *macaddr,
unsigned char tmp)
{
struct ieee80211_node *ni;
/* FIXME: Hack */
if (tmp) {
ni = ieee80211_alloc_node(vap, macaddr);
}
else {
ni = ieee80211_alloc_node_table(vap, macaddr);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: ni:%p allocated for " MAC_FMT "\n",
__func__, ni, MAC_ADDR(macaddr));
}
if (ni != NULL) {
copy_bss_state(ni, vap->iv_bss);
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_bssid);
/* Do this only for nodes that already have a BSS. Otherwise
* ic_bsschan is not set and we get a KASSERT failure.
* Required by ieee80211_fix_rate */
ieee80211_node_set_chan(vap->iv_ic, ni);
}
return ni;
}
static struct ieee80211_node *
ieee80211_find_wds_node_locked(struct ieee80211_node_table *nt,
const u_int8_t *macaddr)
{
struct ieee80211_wds_addr *wds;
int hash;
IEEE80211_NODE_TABLE_LOCK_ASSERT(nt);
hash = IEEE80211_NODE_HASH(macaddr);
LIST_FOREACH(wds, &nt->nt_wds_hash[hash], wds_hash) {
if (IEEE80211_ADDR_EQ(wds->wds_macaddr, macaddr)) {
/* Reset the aging count. */
if (wds->wds_agingcount != WDS_AGING_STATIC)
wds->wds_agingcount = WDS_AGING_COUNT;
return ieee80211_ref_node(wds->wds_ni);
}
}
return NULL;
}
/* NB: A node reference is acquired here; the caller MUST release it. */
static struct ieee80211_node *
ieee80211_find_node_locked(struct ieee80211_node_table *nt,
const u_int8_t *macaddr)
{
struct ieee80211_node *ni;
int hash;
struct ieee80211_wds_addr *wds;
IEEE80211_NODE_TABLE_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);
return ni;
}
}
/* Now, we look for the desired mac address in the 4 address
nodes. */
LIST_FOREACH(wds, &nt->nt_wds_hash[hash], wds_hash) {
if (IEEE80211_ADDR_EQ(wds->wds_macaddr, macaddr))
return ieee80211_ref_node(wds->wds_ni);
}
return NULL;
}
struct ieee80211_node *
ieee80211_find_wds_node(struct ieee80211_node_table *nt,
const u_int8_t *macaddr)
{
struct ieee80211_node *ni;
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
ni = ieee80211_find_wds_node_locked(nt, macaddr);
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
return ni;
}
EXPORT_SYMBOL(ieee80211_find_wds_node);
struct ieee80211_node *
ieee80211_find_node(struct ieee80211_node_table *nt, const u_int8_t *macaddr)
{
struct ieee80211_node *ni;
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
ni = ieee80211_find_node_locked(nt, macaddr);
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
return ni;
}
EXPORT_SYMBOL(ieee80211_find_node);
/*
* 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
* its private state.
*
* Caller must ieee80211_ref_node()
*/
struct ieee80211_node *
ieee80211_fakeup_adhoc_node(struct ieee80211vap *vap,
const u_int8_t macaddr[IEEE80211_ADDR_LEN])
{
struct ieee80211_node *ni;
ni = ieee80211_dup_bss(vap, macaddr, 0);
if (ni != NULL) {
/* XXX no rate negotiation; just dup */
ni->ni_rates = vap->iv_bss->ni_rates;
if (vap->iv_ic->ic_newassoc != NULL)
vap->iv_ic->ic_newassoc(ni, 1);
/* XXX not right for 802.1x/WPA */
ieee80211_node_authorize(ni);
}
return ni;
}
/*
* Do node discovery in adhoc mode on receipt of a beacon
* or probe response frame. Note that for the driver's
* benefit we treat this like an association so the
* driver has an opportunity to setup its private state.
*/
struct ieee80211_node *
ieee80211_add_neighbor(struct ieee80211vap *vap, const struct ieee80211_frame *wh,
const struct ieee80211_scanparams *sp)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
ni = ieee80211_dup_bss(vap, wh->i_addr2, 0);
if (ni != NULL) {
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 = IEEE80211_BINTVAL_SANITISE(sp->bintval);
ni->ni_capinfo = sp->capinfo;
ni->ni_chan = 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);
if (sp->rsn != NULL)
ieee80211_saveie(&ni->ni_rsn_ie, sp->rsn);
if (sp->ath != NULL)
ieee80211_saveath(ni, sp->ath);
/* NB: must be after ni_chan is setup */
ieee80211_setup_rates(ni, sp->rates, sp->xrates, IEEE80211_F_DOSORT);
if (ic->ic_newassoc != NULL)
ic->ic_newassoc(ni, 1);
/* XXX not right for 802.1x/WPA */
ieee80211_node_authorize(ni);
if (vap->iv_opmode == IEEE80211_M_AHDEMO) {
/*
* Blindly propagate capabilities based on the
* local configuration. In particular this permits
* us to use QoS to disable ACKs and to use short
* preamble on 2.4G channels.
*/
if (vap->iv_flags & IEEE80211_F_WME)
ni->ni_flags |= IEEE80211_NODE_QOS;
if (vap->iv_flags & IEEE80211_F_SHPREAMBLE)
ni->ni_capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
}
}
return ni;
}
/*
* Return the node for the sender of a frame; if the sender is unknown return
* NULL. The caller is expected to deal with this. (The frame is sent to all
* VAPs in this case).
*
* NB: A node reference is acquired here; the caller MUST release it.
*/
struct ieee80211_node *
ieee80211_find_rxnode(struct ieee80211com *ic,
const struct ieee80211_frame_min *wh)
{
#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)
#define IS_RTS(wh) \
((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_RTS)
struct ieee80211_node_table *nt;
struct ieee80211_node *ni;
/* XXX: check ic_bss first in station mode */
/* XXX: 4-address frames? */
nt = &ic->ic_sta;
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
/* NB: Control frames typically have one address, except
* for RTS and PSPOLL */
if (IS_CTL(wh) && !IS_PSPOLL(wh) && !IS_RTS(wh))
ni = ieee80211_find_node_locked(nt, wh->i_addr1);
else
ni = ieee80211_find_node_locked(nt, wh->i_addr2);
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
return ni;
#undef IS_PSPOLL
#undef IS_CTL
#undef IS_RTS
}
EXPORT_SYMBOL(ieee80211_find_rxnode);
/*
* Return the appropriate node for sending a data frame. This handles node
* discovery in adhoc networks.
*
* NB: A node reference is acquired here; the caller MUST release it.
*/
struct ieee80211_node *
ieee80211_find_txnode(struct ieee80211vap *vap, const u_int8_t *mac)
{
struct ieee80211_node_table *nt;
struct ieee80211_node *ni = NULL;
/* The destination address should be in the node table
* unless we are operating in station mode or this is a
* multicast/broadcast frame. */
if (vap->iv_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(mac))
return ieee80211_ref_node(vap->iv_bss);
/* XXX: Can't hold lock across dup_bss due to recursive locking. */
nt = &vap->iv_ic->ic_sta;
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
ni = ieee80211_find_node_locked(nt, mac);
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
if (ni == NULL) {
if (vap->iv_opmode == IEEE80211_M_IBSS ||
vap->iv_opmode == IEEE80211_M_AHDEMO) {
/* In adhoc mode cons up a node for the destination.
* Note that we need an additional reference for the
* caller to be consistent with ieee80211_find_node. */
ni = ieee80211_fakeup_adhoc_node(vap, mac);
if (ni != NULL)
ieee80211_ref_node(ni);
} else {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT, mac,
"no node, discard frame (%s)", __func__);
vap->iv_stats.is_tx_nonode++;
}
}
return ni;
}
EXPORT_SYMBOL(ieee80211_find_txnode);
/* Context: hwIRQ, softIRQ and process context. */
static void
ieee80211_free_node(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
atomic_dec(&ni->ni_ic->ic_node_counter);
node_print_message(IEEE80211_MSG_NODE | IEEE80211_MSG_NODE_REF,
1 /* show counter */,
0 /* adjust refcount */,
ni,
"free" /* message */);
if (vap->iv_aid_bitmap != NULL)
IEEE80211_AID_CLR(vap, ni->ni_associd);
vap->iv_ic->ic_node_free(ni);
}
static void _reset_node(void *arg, struct ieee80211_node *ni)
{
if (ni->ni_associd != 0) {
struct ieee80211vap *vap = ni->ni_vap;
if (vap->iv_auth->ia_node_leave != NULL)
vap->iv_auth->ia_node_leave(ni);
if (vap->iv_aid_bitmap != NULL)
IEEE80211_AID_CLR(vap, ni->ni_associd);
}
ieee80211_node_leave(ni);
}
static void
ieee80211_node_table_reset(struct ieee80211_node_table *nt,
struct ieee80211vap *vap)
{
ieee80211_iterate_dev_nodes(vap->iv_dev, nt, _reset_node, NULL);
}
static void
ieee80211_node_table_cleanup(struct ieee80211_node_table *nt)
{
struct ieee80211com *ic = nt->nt_ic;
struct ieee80211_node *ni, *next;
TAILQ_FOREACH_SAFE(ni, &nt->nt_node, ni_list, next) {
if (ni->ni_associd != 0) {
struct ieee80211vap *vap = ni->ni_vap;
if (vap->iv_auth->ia_node_leave != NULL)
vap->iv_auth->ia_node_leave(ni);
if (vap->iv_aid_bitmap != NULL)
IEEE80211_AID_CLR(vap, ni->ni_associd);
}
ic->ic_node_cleanup(ni);
}
del_timer(&nt->nt_wds_aging_timer);
IEEE80211_SCAN_LOCK_DESTROY(nt);
IEEE80211_NODE_TABLE_LOCK_DESTROY(nt);
}
/*
* Timeout inactive stations and do related housekeeping.
* Note that we cannot hold the node lock while sending a
* frame as this would lead to a LOR. Instead we use a
* generation number to mark nodes that we've scanned and
* drop the lock and restart a scan if we have to time out
* a node. Since we are single-threaded by virtue of
* controlling the inactivity timer we can be sure this will
* process each node only once.
*
* Context: softIRQ (tasklet)
*/
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_IRQ(nt);
gen = ++nt->nt_scangen;
restart:
IEEE80211_NODE_TABLE_LOCK_IRQ(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 != NULL &&
time_after(jiffies, ni->ni_rxfragstamp + HZ)) {
ieee80211_dev_kfree_skb(&ni->ni_rxfrag);
}
/*
* Special case ourself; we may be idle for extended periods
* of time and regardless reclaiming our state is wrong.
* Special case a WDS link: it may be dead or idle, but it is
* never ok to reclaim it, as this will block transmissions
* and nobody will recreate the node when the WDS peer is
* available again. */
if ((ni == ni->ni_vap->iv_bss) ||
(ni->ni_vap->iv_opmode == IEEE80211_M_WDS &&
!memcmp(ni->ni_macaddr, ni->ni_vap->wds_mac, ETH_ALEN)))
{
/* NB: don't permit it to go negative */
if (ni->ni_inact > 0)
ni->ni_inact--;
continue;
}
ni->ni_inact--;
if (ni->ni_associd != 0 || isadhoc) {
struct ieee80211vap *vap = ni->ni_vap;
/*
* Age frames on the power save queue.
*/
if (ieee80211_node_saveq_age(ni) != 0 &&
IEEE80211_NODE_SAVEQ_QLEN(ni) == 0 &&
vap->iv_set_tim != NULL)
vap->iv_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 <= vap->iv_inact_probe) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_INACT | IEEE80211_MSG_NODE,
ni, "%s",
"probe station due to inactivity");
/*
* Grab a reference before unlocking the table
* so the node cannot be reclaimed before we
* send the frame. ieee80211_send_nulldata
* understands we've done this and reclaims the
* ref for us as needed.
*/
ieee80211_ref_node(ni);
IEEE80211_NODE_TABLE_UNLOCK_IRQ_EARLY(nt);
ieee80211_send_nulldata(ni);
/* XXX stat? */
goto restart;
}
}
if (ni->ni_inact <= 0) {
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_INACT | IEEE80211_MSG_NODE, ni,
"station timed out due to inactivity (refcnt %u)",
atomic_read(&ni->ni_refcnt));
/*
* Send a deauthenticate frame and drop the station.
* We grab a reference before unlocking the table so
* the node cannot be reclaimed before we complete our
* work.
*
* Separately we must drop the node lock before sending
* in case the driver takes a lock, as this may result
* in a LOR between the node lock and the driver lock.
*/
ni->ni_vap->iv_stats.is_node_timeout++;
ieee80211_ref_node(ni);
IEEE80211_NODE_TABLE_UNLOCK_IRQ_EARLY(nt);
if (ni->ni_associd != 0) {
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_EXPIRE);
}
ieee80211_node_leave(ni);
ieee80211_unref_node(&ni);
goto restart;
}
}
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
IEEE80211_SCAN_UNLOCK_IRQ(nt);
}
/*
* Per-ieee80211com inactivity timer callback.
*/
static void
ieee80211_node_timeout(unsigned long arg)
{
struct ieee80211com *ic = (struct ieee80211com *)arg;
ieee80211_scan_timeout(ic);
ieee80211_timeout_stations(&ic->ic_sta);
mod_timer(&ic->ic_inact, jiffies + IEEE80211_INACT_WAIT * HZ);
}
void
ieee80211_iterate_nodes(struct ieee80211_node_table *nt,
ieee80211_iter_func *f, void *arg)
{
ieee80211_iterate_dev_nodes(NULL, nt, f, arg);
}
EXPORT_SYMBOL(ieee80211_iterate_nodes);
void
ieee80211_iterate_dev_nodes(struct net_device *dev,
struct ieee80211_node_table *nt,
ieee80211_iter_func *f, void *arg)
{
struct ieee80211_node *ni;
u_int gen;
IEEE80211_SCAN_LOCK_IRQ(nt);
gen = ++nt->nt_scangen;
restart:
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
if (dev != NULL && ni->ni_vap->iv_dev != dev)
continue; /* skip node not for this vap */
if (ni->ni_scangen != gen) {
ni->ni_scangen = gen;
(void)ieee80211_ref_node(ni);
IEEE80211_NODE_TABLE_UNLOCK_IRQ_EARLY(nt);
(*f)(arg, ni);
ieee80211_unref_node(&ni);
goto restart;
}
}
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
IEEE80211_SCAN_UNLOCK_IRQ(nt);
}
EXPORT_SYMBOL(ieee80211_iterate_dev_nodes);
void
ieee80211_dump_node(struct ieee80211_node_table *nt, struct ieee80211_node *ni)
{
int i;
printk("0x%p: mac " MAC_FMT " (refcnt %d)\n", ni,
MAC_ADDR(ni->ni_macaddr), atomic_read(&ni->ni_refcnt));
printk("\tscangen %u authmode %u flags 0x%x\n",
ni->ni_scangen, ni->ni_authmode, ni->ni_flags);
printk("\tassocid 0x%x txpower %u vlan %u\n",
ni->ni_associd, ni->ni_txpower, ni->ni_vlan);
printk ("rxfragstamp %lu\n", ni->ni_rxfragstamp);
for (i = 0; i < 17; i++) {
printk("\t%d: txseq %u rxseq %u fragno %u\n", i,
ni->ni_txseqs[i],
ni->ni_rxseqs[i] >> IEEE80211_SEQ_SEQ_SHIFT,
ni->ni_rxseqs[i] & IEEE80211_SEQ_FRAG_MASK);
}
printk("\trtsf %10llu rssi %u intval %u capinfo 0x%x\n",
(unsigned long long)ni->ni_rtsf, ni->ni_rssi, ni->ni_intval,
ni->ni_capinfo);
printk("\tbssid " MAC_FMT " essid \"%.*s\" channel %u:0x%x\n",
MAC_ADDR(ni->ni_bssid),
ni->ni_esslen, ni->ni_essid,
ni->ni_chan != IEEE80211_CHAN_ANYC ?
ni->ni_chan->ic_freq : IEEE80211_CHAN_ANY,
ni->ni_chan != IEEE80211_CHAN_ANYC ? ni->ni_chan->ic_flags : 0);
printk("\tinact %u txrate %u\n",
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 ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
#ifdef IEEE80211_DEBUG
struct ieee80211vap *vap = ni->ni_vap;
#endif
IEEE80211_LOCK_ASSERT(ic);
KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
("not in 11g, bss %u:0x%x, curmode %u", ic->ic_bsschan->ic_freq,
ic->ic_bsschan->ic_flags, ic->ic_curmode));
/*
* Station isn't capable of short slot time. Bump
* the count of long slot time stations and disable
* use of short slot time. Note that the actual switch
* over to long slot time use may not occur until the
* next beacon transmission (per sec. 7.3.1.4 of 11g).
*/
if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
ic->ic_longslotsta++;
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
"station needs long slot time, count %d",
ic->ic_longslotsta);
/* XXX VAPs w/ conflicting needs won't work */
if (!IEEE80211_IS_CHAN_108G(ic->ic_bsschan)) {
/*
* Don't force slot time when switched to turbo
* mode as non-ERP stations won't be present; this
* need only be done when on the normal G channel.
*/
ieee80211_set_shortslottime(ic, 0);
}
}
/*
* If the new station is not an ERP station
* then bump the counter and enable protection
* if configured.
*/
if (!ieee80211_iserp_rateset(ic, &ni->ni_rates)) {
ic->ic_nonerpsta++;
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
"station is !ERP, %d non-ERP stations associated",
ic->ic_nonerpsta);
/*
* If protection is configured, enable it.
*/
if (ic->ic_protmode != IEEE80211_PROT_NONE) {
IEEE80211_DPRINTF(vap, 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_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
"%s", "station needs long preamble");
ic->ic_flags |= IEEE80211_F_USEBARKER;
ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
}
/* Update ERP element if this is first non ERP station */
if (ic->ic_nonerpsta == 1)
ic->ic_flags_ext |= IEEE80211_FEXT_ERPUPDATE;
} else
ni->ni_flags |= IEEE80211_NODE_ERP;
}
static void
count_suppchans(struct ieee80211com *ic, struct ieee80211_node *ni, int inc)
{
int i, tmp1, tmp2 = 0;
if (ni->ni_suppchans == NULL)
return;
CHANNEL_FOREACH(i, ic, tmp1, tmp2)
if (isset(ni->ni_suppchans, i))
ic->ic_chan_nodes[i] += inc;
ic->ic_cn_total += inc;
}
static void
remove_worse_nodes(void *arg, struct ieee80211_node *ni)
{
struct ieee80211_node *better = (struct ieee80211_node *)arg;
int i;
if (ni->ni_suppchans == NULL)
return;
if (ni == better)
return;
for (i = 0; i < better->ni_n_needed_chans; i++)
if (isclr(ni->ni_suppchans, better->ni_needed_chans[i])) {
/* this is the one of the nodes to be killed, do it now */
IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ASSOC|IEEE80211_MSG_DOTH, better->ni_macaddr,
"forcing [" MAC_FMT "] (aid %d) to leave", MAC_ADDR(ni->ni_macaddr),
IEEE80211_NODE_AID(ni));
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_SUPPCHAN_UNACCEPTABLE);
ni->ni_vap->iv_stats.is_node_fdisassoc++;
ieee80211_node_leave(ni);
return;
}
}
void
ieee80211_node_join(struct ieee80211_node *ni, int resp)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
int newassoc;
if (ni->ni_associd == 0) {
u_int16_t aid;
KASSERT(vap->iv_aid_bitmap != NULL, ("no aid bitmap"));
/*
* It would be good to search the bitmap
* more efficiently, but this will do for now.
*/
for (aid = 1; aid < vap->iv_max_aid; aid++)
if (!IEEE80211_AID_ISSET(vap, aid))
break;
if (aid >= vap->iv_max_aid) {
IEEE80211_SEND_MGMT(ni, resp,
IEEE80211_REASON_ASSOC_TOOMANY);
ieee80211_node_leave(ni);
return;
}
ni->ni_associd = aid | 0xc000;
IEEE80211_LOCK_IRQ(ic);
IEEE80211_AID_SET(vap, ni->ni_associd);
vap->iv_sta_assoc++;
ic->ic_sta_assoc++;
#ifdef ATH_SUPERG_XR
if (ni->ni_vap->iv_flags & IEEE80211_F_XR)
ic->ic_xr_sta_assoc++;
#endif
if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_ATHC_TURBOP))
ic->ic_dt_sta_assoc++;
if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan))
ieee80211_node_join_11g(ni);
KASSERT(ni->ni_suppchans == NULL, ("not a reassociation, but suppchans bitmap not NULL"));
/* Use node's new suppchans as the current */
ni->ni_suppchans = ni->ni_suppchans_new;
ni->ni_suppchans_new = NULL;
/* Add node's suppchans to ic->ic_chan_nodes */
count_suppchans(ic, ni, 1);
IEEE80211_UNLOCK_IRQ(ic);
newassoc = 1;
} else {
IEEE80211_LOCK_IRQ(ic);
/* Remove node's previous suppchans from ic->ic_chan_nodes */
count_suppchans(ic, ni, -1);
if (ni->ni_suppchans != NULL) {
FREE(ni->ni_suppchans, M_DEVBUF);
ni->ni_suppchans = NULL;
}
/* Use node's new suppchans as the current */
ni->ni_suppchans = ni->ni_suppchans_new;
ni->ni_suppchans_new = NULL;
/* Add node's new suppchans to ic->ic_chan_nodes */
count_suppchans(ic, ni, 1);
IEEE80211_UNLOCK_IRQ(ic);
newassoc = 0;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, ni,
"station %sassociated at aid %d: %s preamble, %s slot time"
"%s%s%s%s%s%s%s",
newassoc ? "" : "re",
IEEE80211_NODE_AID(ni),
(ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE) ? "short" : "long",
ic->ic_flags & IEEE80211_F_SHSLOT ? "short" : "long",
ic->ic_flags & IEEE80211_F_USEPROT ? ", protection" : "",
ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
", turbo" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_COMP) ?
", compression" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
", fast-frames" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_XR) ? ", XR" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_AR) ? ", AR" : ""
);
/* give driver a chance to setup state like ni_txrate */
if (ic->ic_newassoc != NULL)
ic->ic_newassoc(ni, newassoc);
ni->ni_inact_reload = vap->iv_inact_auth;
ni->ni_inact = ni->ni_inact_reload;
IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_SUCCESS);
if (ni->ni_needed_chans != NULL) {
/* remove nodes which don't support one of ni->ni_needed_chans */
ieee80211_iterate_nodes(&ic->ic_sta, &remove_worse_nodes, (void *)ni);
FREE(ni->ni_needed_chans, M_DEVBUF);
ni->ni_needed_chans = NULL;
}
/* tell the authenticator about new station */
if (vap->iv_auth->ia_node_join != NULL)
vap->iv_auth->ia_node_join(ni);
ieee80211_notify_node_join(ni, newassoc);
}
/*
* Handle a station leaving an 11g network.
*/
static void
ieee80211_node_leave_11g(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
IEEE80211_LOCK_ASSERT(ic);
KASSERT(IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan),
("not in 11g, bss %u:0x%x, curmode %u",
ic->ic_bsschan->ic_freq, ic->ic_bsschan->ic_flags,
ic->ic_curmode));
/*
* If a long slot station do the slot time bookkeeping.
*/
if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) == 0) {
/* this can be 0 on mode changes from B -> G */
if (ic->ic_longslotsta > 0)
ic->ic_longslotsta--;
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
"long slot time station leaves, count now %d",
ic->ic_longslotsta);
if (ic->ic_longslotsta == 0) {
/*
* Re-enable use of short slot time if supported
* and not operating in IBSS mode (per spec).
*/
if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
vap->iv_opmode != IEEE80211_M_IBSS) {
IEEE80211_DPRINTF(vap, IEEE80211_MSG_ASSOC,
"%s: re-enable use of short slot time\n",
__func__);
ieee80211_set_shortslottime(ic, 1);
}
}
}
/*
* If a non-ERP station do the protection-related bookkeeping.
*/
if ((ni->ni_flags & IEEE80211_NODE_ERP) == 0) {
/* this can be 0 on mode changes from B -> G */
if (ic->ic_nonerpsta > 0)
ic->ic_nonerpsta--;
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
"non-ERP station leaves, count now %d", ic->ic_nonerpsta);
if (ic->ic_nonerpsta == 0) {
IEEE80211_DPRINTF(vap, 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(vap, 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 a station/neighbor leaving
* the bss when operating in ap or adhoc modes.
*/
void
ieee80211_node_leave(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_node_table *nt = ni->ni_table;
if (IEEE80211_NODE_AID(ni) != 0)
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG,
ni, "station with aid %d leaves (refcnt %u)",
IEEE80211_NODE_AID(ni), atomic_read(&ni->ni_refcnt));
/* From this point onwards we can no longer find the node,
* so no more references are generated
*/
ieee80211_remove_wds_addr(nt, ni->ni_macaddr);
ieee80211_del_wds_node(nt, ni);
IEEE80211_NODE_TABLE_LOCK_IRQ(nt);
node_table_leave_locked(nt, ni);
IEEE80211_NODE_TABLE_UNLOCK_IRQ(nt);
/*
* If node wasn't previously associated all
* we need to do is reclaim the reference.
* This also goes for nodes that are auth'ed but
* not associated.
*/
/* 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 its state block.
*/
if (vap->iv_auth->ia_node_leave != NULL)
vap->iv_auth->ia_node_leave(ni);
ieee80211_notify_sta_stats(ni);
IEEE80211_LOCK_IRQ(ic);
if (vap->iv_aid_bitmap != NULL)
IEEE80211_AID_CLR(vap, ni->ni_associd);
ni->ni_associd = 0;
vap->iv_sta_assoc--;
ic->ic_sta_assoc--;
#ifdef ATH_SUPERG_XR
if (ni->ni_vap->iv_flags & IEEE80211_F_XR)
ic->ic_xr_sta_assoc--;
#endif
if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_ATHC_TURBOP))
ic->ic_dt_sta_assoc--;
if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan))
ieee80211_node_leave_11g(ni);
/* Remove node's suppchans from ic->ic_chan_nodes */
if (ni->ni_suppchans != NULL)
count_suppchans(ic, ni, -1);
IEEE80211_UNLOCK_IRQ(ic);
/*
* Cleanup station state. In particular clear various
* state that might otherwise be reused if the node
* is reused before the reference count goes to zero
* (and memory is reclaimed).
*/
ieee80211_sta_leave(ni);
done:
/* Run a cleanup */
ic->ic_node_cleanup(ni);
}
EXPORT_SYMBOL(ieee80211_node_leave);
u_int8_t
ieee80211_getrssi(struct ieee80211com *ic)
{
#define NZ(x) ((x) == 0 ? 1 : (x))
struct ieee80211_node_table *nt = &ic->ic_sta;
struct ieee80211vap *vap;
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) {
if (memcmp(ni->ni_vap->iv_myaddr, ni->ni_macaddr,
IEEE80211_ADDR_LEN)!=0) {
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:
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_bss != NULL) {
rssi_samples++;
rssi_total += ic->ic_node_getrssi(vap->iv_bss);
}
break;
}
return rssi_total / NZ(rssi_samples);
#undef NZ
}
EXPORT_SYMBOL(ieee80211_getrssi);
void
ieee80211_node_reset(struct ieee80211_node *ni, struct ieee80211vap *vap)
{
/* XXX: Untested use of iv_bssid. */
IEEE80211_ADDR_COPY(ni->ni_bssid, vap->iv_bssid);
ni->ni_prev_vap = ni->ni_vap;
ni->ni_vap = vap;
ni->ni_ic = vap->iv_ic;
}
EXPORT_SYMBOL(ieee80211_node_reset);
struct ieee80211_node *
ieee80211_ref_node(struct ieee80211_node *ni)
{
if (ni == NULL) {
printk(KERN_ERR "%s: NULL node.\n", __func__);
dump_stack();
} else if (atomic_read(&ni->ni_refcnt) < 1) {
node_print_message(IEEE80211_MSG_ANY,
0 /* show counter */,
0 /* adjust refcount */,
ni,
"attempt to access node with invalid "
"refcount of %d. No changes made.",
atomic_read(&ni->ni_refcnt));
} else {
atomic_inc(&ni->ni_refcnt);
node_print_message(IEEE80211_MSG_NODE_REF,
0 /* show counter */,
0 /* adjust refcount */,
ni, "ref");
}
return ni;
}
EXPORT_SYMBOL(ieee80211_ref_node);
void
ieee80211_unref_node(struct ieee80211_node **pni)
{
struct ieee80211_node *ni = NULL;
if (pni == NULL) {
printk(KERN_ERR "%s: NULL ieee80211_node **\n", __func__);
dump_stack();
return;
}
ni = *pni;
if (ni == NULL) {
printk(KERN_ERR "%s: NULL ieee80211_node *\n", __func__);
dump_stack();
return;
}
if (atomic_read(&ni->ni_refcnt) < 1) {
node_print_message(IEEE80211_MSG_ANY,
0 /* show counter */,
0 /* adjust refcount */,
ni,
"attempt to access node with invalid "
"refcount of %d. No changes made.",
atomic_read(&ni->ni_refcnt));
dump_stack();
return;
}
node_print_message(IEEE80211_MSG_NODE_REF,
0 /* show counter */,
-1 /* adjust refcount */,
ni,
"unref" /* message */);
if (atomic_dec_and_test(&ni->ni_refcnt))
ieee80211_free_node(ni);
*pni = NULL;
}
EXPORT_SYMBOL(ieee80211_unref_node);
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