/
ieee80211_node.c
2197 lines (1979 loc) · 63.4 KB
/
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);