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freebsd-nq/sys/net80211/ieee80211_proto.c
Adrian Chadd 23401900d3 Fix a panic in the wifi stack when a software beacon miss occurs in the wrong state. 
The ieee80211_swbmiss() callout is not called with the ic lock held, so it's
quite possible the scheduler will run the callout during a state change.

This patch:

* changes the swbmiss callout to be locked by the ic lock
* enforces the ic lock being held across the beacon vap functions
  by grabbing it inside beacon_miss() and beacon_swmiss().

This ensures that the ic lock is held (and thus the VAP state
stays constant) during beacon miss and software miss processing.
Since the callout is removed whilst the ic lock is held, it also
ensures that the ic lock can't be called during a state change
or exhibit any race conditions seen above.

Both Edgar and Joel report that this patch fixes the crash and
doesn't introduce new issues.

Reported by:	Edgar Martinez <emartinez@kbcnetworks.com>
Reported by:	Joel Dahl <joel@vnode.se>
Reported by:	emaste
2011-10-02 02:42:31 +00:00

1936 lines
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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* IEEE 802.11 protocol support.
*/
#include "opt_inet.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/ethernet.h> /* XXX for ether_sprintf */
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_adhoc.h>
#include <net80211/ieee80211_sta.h>
#include <net80211/ieee80211_hostap.h>
#include <net80211/ieee80211_wds.h>
#ifdef IEEE80211_SUPPORT_MESH
#include <net80211/ieee80211_mesh.h>
#endif
#include <net80211/ieee80211_monitor.h>
#include <net80211/ieee80211_input.h>
/* XXX tunables */
#define AGGRESSIVE_MODE_SWITCH_HYSTERESIS 3 /* pkts / 100ms */
#define HIGH_PRI_SWITCH_THRESH 10 /* pkts / 100ms */
const char *ieee80211_mgt_subtype_name[] = {
"assoc_req", "assoc_resp", "reassoc_req", "reassoc_resp",
"probe_req", "probe_resp", "reserved#6", "reserved#7",
"beacon", "atim", "disassoc", "auth",
"deauth", "action", "action_noack", "reserved#15"
};
const char *ieee80211_ctl_subtype_name[] = {
"reserved#0", "reserved#1", "reserved#2", "reserved#3",
"reserved#3", "reserved#5", "reserved#6", "reserved#7",
"reserved#8", "reserved#9", "ps_poll", "rts",
"cts", "ack", "cf_end", "cf_end_ack"
};
const char *ieee80211_opmode_name[IEEE80211_OPMODE_MAX] = {
"IBSS", /* IEEE80211_M_IBSS */
"STA", /* IEEE80211_M_STA */
"WDS", /* IEEE80211_M_WDS */
"AHDEMO", /* IEEE80211_M_AHDEMO */
"HOSTAP", /* IEEE80211_M_HOSTAP */
"MONITOR", /* IEEE80211_M_MONITOR */
"MBSS" /* IEEE80211_M_MBSS */
};
const char *ieee80211_state_name[IEEE80211_S_MAX] = {
"INIT", /* IEEE80211_S_INIT */
"SCAN", /* IEEE80211_S_SCAN */
"AUTH", /* IEEE80211_S_AUTH */
"ASSOC", /* IEEE80211_S_ASSOC */
"CAC", /* IEEE80211_S_CAC */
"RUN", /* IEEE80211_S_RUN */
"CSA", /* IEEE80211_S_CSA */
"SLEEP", /* IEEE80211_S_SLEEP */
};
const char *ieee80211_wme_acnames[] = {
"WME_AC_BE",
"WME_AC_BK",
"WME_AC_VI",
"WME_AC_VO",
"WME_UPSD",
};
static void beacon_miss(void *, int);
static void beacon_swmiss(void *, int);
static void parent_updown(void *, int);
static void update_mcast(void *, int);
static void update_promisc(void *, int);
static void update_channel(void *, int);
static void ieee80211_newstate_cb(void *, int);
static int ieee80211_new_state_locked(struct ieee80211vap *,
enum ieee80211_state, int);
static int
null_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
const struct ieee80211_bpf_params *params)
{
struct ifnet *ifp = ni->ni_ic->ic_ifp;
if_printf(ifp, "missing ic_raw_xmit callback, drop frame\n");
m_freem(m);
return ENETDOWN;
}
void
ieee80211_proto_attach(struct ieee80211com *ic)
{
struct ifnet *ifp = ic->ic_ifp;
/* override the 802.3 setting */
ifp->if_hdrlen = ic->ic_headroom
+ sizeof(struct ieee80211_qosframe_addr4)
+ IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN
+ IEEE80211_WEP_EXTIVLEN;
/* XXX no way to recalculate on ifdetach */
if (ALIGN(ifp->if_hdrlen) > max_linkhdr) {
/* XXX sanity check... */
max_linkhdr = ALIGN(ifp->if_hdrlen);
max_hdr = max_linkhdr + max_protohdr;
max_datalen = MHLEN - max_hdr;
}
ic->ic_protmode = IEEE80211_PROT_CTSONLY;
TASK_INIT(&ic->ic_parent_task, 0, parent_updown, ifp);
TASK_INIT(&ic->ic_mcast_task, 0, update_mcast, ic);
TASK_INIT(&ic->ic_promisc_task, 0, update_promisc, ic);
TASK_INIT(&ic->ic_chan_task, 0, update_channel, ic);
TASK_INIT(&ic->ic_bmiss_task, 0, beacon_miss, ic);
ic->ic_wme.wme_hipri_switch_hysteresis =
AGGRESSIVE_MODE_SWITCH_HYSTERESIS;
/* initialize management frame handlers */
ic->ic_send_mgmt = ieee80211_send_mgmt;
ic->ic_raw_xmit = null_raw_xmit;
ieee80211_adhoc_attach(ic);
ieee80211_sta_attach(ic);
ieee80211_wds_attach(ic);
ieee80211_hostap_attach(ic);
#ifdef IEEE80211_SUPPORT_MESH
ieee80211_mesh_attach(ic);
#endif
ieee80211_monitor_attach(ic);
}
void
ieee80211_proto_detach(struct ieee80211com *ic)
{
ieee80211_monitor_detach(ic);
#ifdef IEEE80211_SUPPORT_MESH
ieee80211_mesh_detach(ic);
#endif
ieee80211_hostap_detach(ic);
ieee80211_wds_detach(ic);
ieee80211_adhoc_detach(ic);
ieee80211_sta_detach(ic);
}
static void
null_update_beacon(struct ieee80211vap *vap, int item)
{
}
void
ieee80211_proto_vattach(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ifnet *ifp = vap->iv_ifp;
int i;
/* override the 802.3 setting */
ifp->if_hdrlen = ic->ic_ifp->if_hdrlen;
vap->iv_rtsthreshold = IEEE80211_RTS_DEFAULT;
vap->iv_fragthreshold = IEEE80211_FRAG_DEFAULT;
vap->iv_bmiss_max = IEEE80211_BMISS_MAX;
callout_init_mtx(&vap->iv_swbmiss, IEEE80211_LOCK_OBJ(ic), 0);
callout_init(&vap->iv_mgtsend, CALLOUT_MPSAFE);
TASK_INIT(&vap->iv_nstate_task, 0, ieee80211_newstate_cb, vap);
TASK_INIT(&vap->iv_swbmiss_task, 0, beacon_swmiss, vap);
/*
* Install default tx rate handling: no fixed rate, lowest
* supported rate for mgmt and multicast frames. Default
* max retry count. These settings can be changed by the
* driver and/or user applications.
*/
for (i = IEEE80211_MODE_11A; i < IEEE80211_MODE_MAX; i++) {
const struct ieee80211_rateset *rs = &ic->ic_sup_rates[i];
vap->iv_txparms[i].ucastrate = IEEE80211_FIXED_RATE_NONE;
/*
* Setting the management rate to MCS 0 assumes that the
* BSS Basic rate set is empty and the BSS Basic MCS set
* is not.
*
* Since we're not checking this, default to the lowest
* defined rate for this mode.
*
* At least one 11n AP (DLINK DIR-825) is reported to drop
* some MCS management traffic (eg BA response frames.)
*
* See also: 9.6.0 of the 802.11n-2009 specification.
*/
#ifdef NOTYET
if (i == IEEE80211_MODE_11NA || i == IEEE80211_MODE_11NG) {
vap->iv_txparms[i].mgmtrate = 0 | IEEE80211_RATE_MCS;
vap->iv_txparms[i].mcastrate = 0 | IEEE80211_RATE_MCS;
} else {
vap->iv_txparms[i].mgmtrate =
rs->rs_rates[0] & IEEE80211_RATE_VAL;
vap->iv_txparms[i].mcastrate =
rs->rs_rates[0] & IEEE80211_RATE_VAL;
}
#endif
vap->iv_txparms[i].mgmtrate = rs->rs_rates[0] & IEEE80211_RATE_VAL;
vap->iv_txparms[i].mcastrate = rs->rs_rates[0] & IEEE80211_RATE_VAL;
vap->iv_txparms[i].maxretry = IEEE80211_TXMAX_DEFAULT;
}
vap->iv_roaming = IEEE80211_ROAMING_AUTO;
vap->iv_update_beacon = null_update_beacon;
vap->iv_deliver_data = ieee80211_deliver_data;
/* attach support for operating mode */
ic->ic_vattach[vap->iv_opmode](vap);
}
void
ieee80211_proto_vdetach(struct ieee80211vap *vap)
{
#define FREEAPPIE(ie) do { \
if (ie != NULL) \
free(ie, M_80211_NODE_IE); \
} while (0)
/*
* Detach operating mode module.
*/
if (vap->iv_opdetach != NULL)
vap->iv_opdetach(vap);
/*
* This should not be needed as we detach when reseting
* the state but be conservative here since the
* authenticator may do things like spawn kernel threads.
*/
if (vap->iv_auth->ia_detach != NULL)
vap->iv_auth->ia_detach(vap);
/*
* Detach any ACL'ator.
*/
if (vap->iv_acl != NULL)
vap->iv_acl->iac_detach(vap);
FREEAPPIE(vap->iv_appie_beacon);
FREEAPPIE(vap->iv_appie_probereq);
FREEAPPIE(vap->iv_appie_proberesp);
FREEAPPIE(vap->iv_appie_assocreq);
FREEAPPIE(vap->iv_appie_assocresp);
FREEAPPIE(vap->iv_appie_wpa);
#undef FREEAPPIE
}
/*
* Simple-minded authenticator module support.
*/
#define IEEE80211_AUTH_MAX (IEEE80211_AUTH_WPA+1)
/* XXX well-known names */
static const char *auth_modnames[IEEE80211_AUTH_MAX] = {
"wlan_internal", /* IEEE80211_AUTH_NONE */
"wlan_internal", /* IEEE80211_AUTH_OPEN */
"wlan_internal", /* IEEE80211_AUTH_SHARED */
"wlan_xauth", /* IEEE80211_AUTH_8021X */
"wlan_internal", /* IEEE80211_AUTH_AUTO */
"wlan_xauth", /* IEEE80211_AUTH_WPA */
};
static const struct ieee80211_authenticator *authenticators[IEEE80211_AUTH_MAX];
static const struct ieee80211_authenticator auth_internal = {
.ia_name = "wlan_internal",
.ia_attach = NULL,
.ia_detach = NULL,
.ia_node_join = NULL,
.ia_node_leave = NULL,
};
/*
* Setup internal authenticators once; they are never unregistered.
*/
static void
ieee80211_auth_setup(void)
{
ieee80211_authenticator_register(IEEE80211_AUTH_OPEN, &auth_internal);
ieee80211_authenticator_register(IEEE80211_AUTH_SHARED, &auth_internal);
ieee80211_authenticator_register(IEEE80211_AUTH_AUTO, &auth_internal);
}
SYSINIT(wlan_auth, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_auth_setup, NULL);
const struct ieee80211_authenticator *
ieee80211_authenticator_get(int auth)
{
if (auth >= IEEE80211_AUTH_MAX)
return NULL;
if (authenticators[auth] == NULL)
ieee80211_load_module(auth_modnames[auth]);
return authenticators[auth];
}
void
ieee80211_authenticator_register(int type,
const struct ieee80211_authenticator *auth)
{
if (type >= IEEE80211_AUTH_MAX)
return;
authenticators[type] = auth;
}
void
ieee80211_authenticator_unregister(int type)
{
if (type >= IEEE80211_AUTH_MAX)
return;
authenticators[type] = NULL;
}
/*
* Very simple-minded ACL module support.
*/
/* XXX just one for now */
static const struct ieee80211_aclator *acl = NULL;
void
ieee80211_aclator_register(const struct ieee80211_aclator *iac)
{
printf("wlan: %s acl policy registered\n", iac->iac_name);
acl = iac;
}
void
ieee80211_aclator_unregister(const struct ieee80211_aclator *iac)
{
if (acl == iac)
acl = NULL;
printf("wlan: %s acl policy unregistered\n", iac->iac_name);
}
const struct ieee80211_aclator *
ieee80211_aclator_get(const char *name)
{
if (acl == NULL)
ieee80211_load_module("wlan_acl");
return acl != NULL && strcmp(acl->iac_name, name) == 0 ? acl : NULL;
}
void
ieee80211_print_essid(const uint8_t *essid, int len)
{
const uint8_t *p;
int i;
if (len > IEEE80211_NWID_LEN)
len = IEEE80211_NWID_LEN;
/* determine printable or not */
for (i = 0, p = essid; i < len; i++, p++) {
if (*p < ' ' || *p > 0x7e)
break;
}
if (i == len) {
printf("\"");
for (i = 0, p = essid; i < len; i++, p++)
printf("%c", *p);
printf("\"");
} else {
printf("0x");
for (i = 0, p = essid; i < len; i++, p++)
printf("%02x", *p);
}
}
void
ieee80211_dump_pkt(struct ieee80211com *ic,
const uint8_t *buf, int len, int rate, int rssi)
{
const struct ieee80211_frame *wh;
int i;
wh = (const struct ieee80211_frame *)buf;
switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
case IEEE80211_FC1_DIR_NODS:
printf("NODS %s", ether_sprintf(wh->i_addr2));
printf("->%s", ether_sprintf(wh->i_addr1));
printf("(%s)", ether_sprintf(wh->i_addr3));
break;
case IEEE80211_FC1_DIR_TODS:
printf("TODS %s", ether_sprintf(wh->i_addr2));
printf("->%s", ether_sprintf(wh->i_addr3));
printf("(%s)", ether_sprintf(wh->i_addr1));
break;
case IEEE80211_FC1_DIR_FROMDS:
printf("FRDS %s", ether_sprintf(wh->i_addr3));
printf("->%s", ether_sprintf(wh->i_addr1));
printf("(%s)", ether_sprintf(wh->i_addr2));
break;
case IEEE80211_FC1_DIR_DSTODS:
printf("DSDS %s", ether_sprintf((const uint8_t *)&wh[1]));
printf("->%s", ether_sprintf(wh->i_addr3));
printf("(%s", ether_sprintf(wh->i_addr2));
printf("->%s)", ether_sprintf(wh->i_addr1));
break;
}
switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
case IEEE80211_FC0_TYPE_DATA:
printf(" data");
break;
case IEEE80211_FC0_TYPE_MGT:
printf(" %s", ieee80211_mgt_subtype_name[
(wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK)
>> IEEE80211_FC0_SUBTYPE_SHIFT]);
break;
default:
printf(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK);
break;
}
if (IEEE80211_QOS_HAS_SEQ(wh)) {
const struct ieee80211_qosframe *qwh =
(const struct ieee80211_qosframe *)buf;
printf(" QoS [TID %u%s]", qwh->i_qos[0] & IEEE80211_QOS_TID,
qwh->i_qos[0] & IEEE80211_QOS_ACKPOLICY ? " ACM" : "");
}
if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
int off;
off = ieee80211_anyhdrspace(ic, wh);
printf(" WEP [IV %.02x %.02x %.02x",
buf[off+0], buf[off+1], buf[off+2]);
if (buf[off+IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV)
printf(" %.02x %.02x %.02x",
buf[off+4], buf[off+5], buf[off+6]);
printf(" KID %u]", buf[off+IEEE80211_WEP_IVLEN] >> 6);
}
if (rate >= 0)
printf(" %dM", rate / 2);
if (rssi >= 0)
printf(" +%d", rssi);
printf("\n");
if (len > 0) {
for (i = 0; i < len; i++) {
if ((i & 1) == 0)
printf(" ");
printf("%02x", buf[i]);
}
printf("\n");
}
}
static __inline int
findrix(const struct ieee80211_rateset *rs, int r)
{
int i;
for (i = 0; i < rs->rs_nrates; i++)
if ((rs->rs_rates[i] & IEEE80211_RATE_VAL) == r)
return i;
return -1;
}
int
ieee80211_fix_rate(struct ieee80211_node *ni,
struct ieee80211_rateset *nrs, int flags)
{
#define RV(v) ((v) & IEEE80211_RATE_VAL)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
int i, j, rix, error;
int okrate, badrate, fixedrate, ucastrate;
const struct ieee80211_rateset *srs;
uint8_t r;
error = 0;
okrate = badrate = 0;
ucastrate = vap->iv_txparms[ieee80211_chan2mode(ni->ni_chan)].ucastrate;
if (ucastrate != IEEE80211_FIXED_RATE_NONE) {
/*
* Workaround awkwardness with fixed rate. We are called
* to check both the legacy rate set and the HT rate set
* but we must apply any legacy fixed rate check only to the
* legacy rate set and vice versa. We cannot tell what type
* of rate set we've been given (legacy or HT) but we can
* distinguish the fixed rate type (MCS have 0x80 set).
* So to deal with this the caller communicates whether to
* check MCS or legacy rate using the flags and we use the
* type of any fixed rate to avoid applying an MCS to a
* legacy rate and vice versa.
*/
if (ucastrate & 0x80) {
if (flags & IEEE80211_F_DOFRATE)
flags &= ~IEEE80211_F_DOFRATE;
} else if ((ucastrate & 0x80) == 0) {
if (flags & IEEE80211_F_DOFMCS)
flags &= ~IEEE80211_F_DOFMCS;
}
/* NB: required to make MCS match below work */
ucastrate &= IEEE80211_RATE_VAL;
}
fixedrate = IEEE80211_FIXED_RATE_NONE;
/*
* XXX we are called to process both MCS and legacy rates;
* we must use the appropriate basic rate set or chaos will
* ensue; for now callers that want MCS must supply
* IEEE80211_F_DOBRS; at some point we'll need to split this
* function so there are two variants, one for MCS and one
* for legacy rates.
*/
if (flags & IEEE80211_F_DOBRS)
srs = (const struct ieee80211_rateset *)
ieee80211_get_suphtrates(ic, ni->ni_chan);
else
srs = ieee80211_get_suprates(ic, ni->ni_chan);
for (i = 0; i < nrs->rs_nrates; ) {
if (flags & IEEE80211_F_DOSORT) {
/*
* Sort rates.
*/
for (j = i + 1; j < nrs->rs_nrates; j++) {
if (RV(nrs->rs_rates[i]) > RV(nrs->rs_rates[j])) {
r = nrs->rs_rates[i];
nrs->rs_rates[i] = nrs->rs_rates[j];
nrs->rs_rates[j] = r;
}
}
}
r = nrs->rs_rates[i] & IEEE80211_RATE_VAL;
badrate = r;
/*
* Check for fixed rate.
*/
if (r == ucastrate)
fixedrate = r;
/*
* Check against supported rates.
*/
rix = findrix(srs, r);
if (flags & IEEE80211_F_DONEGO) {
if (rix < 0) {
/*
* A rate in the node's rate set is not
* supported. If this is a basic rate and we
* are operating as a STA then this is an error.
* Otherwise we just discard/ignore the rate.
*/
if ((flags & IEEE80211_F_JOIN) &&
(nrs->rs_rates[i] & IEEE80211_RATE_BASIC))
error++;
} else if ((flags & IEEE80211_F_JOIN) == 0) {
/*
* Overwrite with the supported rate
* value so any basic rate bit is set.
*/
nrs->rs_rates[i] = srs->rs_rates[rix];
}
}
if ((flags & IEEE80211_F_DODEL) && rix < 0) {
/*
* Delete unacceptable rates.
*/
nrs->rs_nrates--;
for (j = i; j < nrs->rs_nrates; j++)
nrs->rs_rates[j] = nrs->rs_rates[j + 1];
nrs->rs_rates[j] = 0;
continue;
}
if (rix >= 0)
okrate = nrs->rs_rates[i];
i++;
}
if (okrate == 0 || error != 0 ||
((flags & (IEEE80211_F_DOFRATE|IEEE80211_F_DOFMCS)) &&
fixedrate != ucastrate)) {
IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
"%s: flags 0x%x okrate %d error %d fixedrate 0x%x "
"ucastrate %x\n", __func__, fixedrate, ucastrate, flags);
return badrate | IEEE80211_RATE_BASIC;
} else
return RV(okrate);
#undef RV
}
/*
* Reset 11g-related state.
*/
void
ieee80211_reset_erp(struct ieee80211com *ic)
{
ic->ic_flags &= ~IEEE80211_F_USEPROT;
ic->ic_nonerpsta = 0;
ic->ic_longslotsta = 0;
/*
* Short slot time is enabled only when operating in 11g
* and not in an IBSS. We must also honor whether or not
* the driver is capable of doing it.
*/
ieee80211_set_shortslottime(ic,
IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
IEEE80211_IS_CHAN_HT(ic->ic_curchan) ||
(IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
ic->ic_opmode == IEEE80211_M_HOSTAP &&
(ic->ic_caps & IEEE80211_C_SHSLOT)));
/*
* Set short preamble and ERP barker-preamble flags.
*/
if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
(ic->ic_caps & IEEE80211_C_SHPREAMBLE)) {
ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
ic->ic_flags &= ~IEEE80211_F_USEBARKER;
} else {
ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
ic->ic_flags |= IEEE80211_F_USEBARKER;
}
}
/*
* Set the short slot time state and notify the driver.
*/
void
ieee80211_set_shortslottime(struct ieee80211com *ic, int onoff)
{
if (onoff)
ic->ic_flags |= IEEE80211_F_SHSLOT;
else
ic->ic_flags &= ~IEEE80211_F_SHSLOT;
/* notify driver */
if (ic->ic_updateslot != NULL)
ic->ic_updateslot(ic->ic_ifp);
}
/*
* Check if the specified rate set supports ERP.
* NB: the rate set is assumed to be sorted.
*/
int
ieee80211_iserp_rateset(const struct ieee80211_rateset *rs)
{
#define N(a) (sizeof(a) / sizeof(a[0]))
static const int rates[] = { 2, 4, 11, 22, 12, 24, 48 };
int i, j;
if (rs->rs_nrates < N(rates))
return 0;
for (i = 0; i < N(rates); i++) {
for (j = 0; j < rs->rs_nrates; j++) {
int r = rs->rs_rates[j] & IEEE80211_RATE_VAL;
if (rates[i] == r)
goto next;
if (r > rates[i])
return 0;
}
return 0;
next:
;
}
return 1;
#undef N
}
/*
* Mark the basic rates for the rate table based on the
* operating mode. For real 11g we mark all the 11b rates
* and 6, 12, and 24 OFDM. For 11b compatibility we mark only
* 11b rates. There's also a pseudo 11a-mode used to mark only
* the basic OFDM rates.
*/
static void
setbasicrates(struct ieee80211_rateset *rs,
enum ieee80211_phymode mode, int add)
{
static const struct ieee80211_rateset basic[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_11A] = { 3, { 12, 24, 48 } },
[IEEE80211_MODE_11B] = { 2, { 2, 4 } },
/* NB: mixed b/g */
[IEEE80211_MODE_11G] = { 4, { 2, 4, 11, 22 } },
[IEEE80211_MODE_TURBO_A] = { 3, { 12, 24, 48 } },
[IEEE80211_MODE_TURBO_G] = { 4, { 2, 4, 11, 22 } },
[IEEE80211_MODE_STURBO_A] = { 3, { 12, 24, 48 } },
[IEEE80211_MODE_HALF] = { 3, { 6, 12, 24 } },
[IEEE80211_MODE_QUARTER] = { 3, { 3, 6, 12 } },
[IEEE80211_MODE_11NA] = { 3, { 12, 24, 48 } },
/* NB: mixed b/g */
[IEEE80211_MODE_11NG] = { 4, { 2, 4, 11, 22 } },
};
int i, j;
for (i = 0; i < rs->rs_nrates; i++) {
if (!add)
rs->rs_rates[i] &= IEEE80211_RATE_VAL;
for (j = 0; j < basic[mode].rs_nrates; j++)
if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
break;
}
}
}
/*
* Set the basic rates in a rate set.
*/
void
ieee80211_setbasicrates(struct ieee80211_rateset *rs,
enum ieee80211_phymode mode)
{
setbasicrates(rs, mode, 0);
}
/*
* Add basic rates to a rate set.
*/
void
ieee80211_addbasicrates(struct ieee80211_rateset *rs,
enum ieee80211_phymode mode)
{
setbasicrates(rs, mode, 1);
}
/*
* WME protocol support.
*
* The default 11a/b/g/n parameters come from the WiFi Alliance WMM
* System Interopability Test Plan (v1.4, Appendix F) and the 802.11n
* Draft 2.0 Test Plan (Appendix D).
*
* Static/Dynamic Turbo mode settings come from Atheros.
*/
typedef struct phyParamType {
uint8_t aifsn;
uint8_t logcwmin;
uint8_t logcwmax;
uint16_t txopLimit;
uint8_t acm;
} paramType;
static const struct phyParamType phyParamForAC_BE[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = { 3, 4, 6, 0, 0 },
[IEEE80211_MODE_11A] = { 3, 4, 6, 0, 0 },
[IEEE80211_MODE_11B] = { 3, 4, 6, 0, 0 },
[IEEE80211_MODE_11G] = { 3, 4, 6, 0, 0 },
[IEEE80211_MODE_FH] = { 3, 4, 6, 0, 0 },
[IEEE80211_MODE_TURBO_A]= { 2, 3, 5, 0, 0 },
[IEEE80211_MODE_TURBO_G]= { 2, 3, 5, 0, 0 },
[IEEE80211_MODE_STURBO_A]={ 2, 3, 5, 0, 0 },
[IEEE80211_MODE_HALF] = { 3, 4, 6, 0, 0 },
[IEEE80211_MODE_QUARTER]= { 3, 4, 6, 0, 0 },
[IEEE80211_MODE_11NA] = { 3, 4, 6, 0, 0 },
[IEEE80211_MODE_11NG] = { 3, 4, 6, 0, 0 },
};
static const struct phyParamType phyParamForAC_BK[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = { 7, 4, 10, 0, 0 },
[IEEE80211_MODE_11A] = { 7, 4, 10, 0, 0 },
[IEEE80211_MODE_11B] = { 7, 4, 10, 0, 0 },
[IEEE80211_MODE_11G] = { 7, 4, 10, 0, 0 },
[IEEE80211_MODE_FH] = { 7, 4, 10, 0, 0 },
[IEEE80211_MODE_TURBO_A]= { 7, 3, 10, 0, 0 },
[IEEE80211_MODE_TURBO_G]= { 7, 3, 10, 0, 0 },
[IEEE80211_MODE_STURBO_A]={ 7, 3, 10, 0, 0 },
[IEEE80211_MODE_HALF] = { 7, 4, 10, 0, 0 },
[IEEE80211_MODE_QUARTER]= { 7, 4, 10, 0, 0 },
[IEEE80211_MODE_11NA] = { 7, 4, 10, 0, 0 },
[IEEE80211_MODE_11NG] = { 7, 4, 10, 0, 0 },
};
static const struct phyParamType phyParamForAC_VI[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = { 1, 3, 4, 94, 0 },
[IEEE80211_MODE_11A] = { 1, 3, 4, 94, 0 },
[IEEE80211_MODE_11B] = { 1, 3, 4, 188, 0 },
[IEEE80211_MODE_11G] = { 1, 3, 4, 94, 0 },
[IEEE80211_MODE_FH] = { 1, 3, 4, 188, 0 },
[IEEE80211_MODE_TURBO_A]= { 1, 2, 3, 94, 0 },
[IEEE80211_MODE_TURBO_G]= { 1, 2, 3, 94, 0 },
[IEEE80211_MODE_STURBO_A]={ 1, 2, 3, 94, 0 },
[IEEE80211_MODE_HALF] = { 1, 3, 4, 94, 0 },
[IEEE80211_MODE_QUARTER]= { 1, 3, 4, 94, 0 },
[IEEE80211_MODE_11NA] = { 1, 3, 4, 94, 0 },
[IEEE80211_MODE_11NG] = { 1, 3, 4, 94, 0 },
};
static const struct phyParamType phyParamForAC_VO[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = { 1, 2, 3, 47, 0 },
[IEEE80211_MODE_11A] = { 1, 2, 3, 47, 0 },
[IEEE80211_MODE_11B] = { 1, 2, 3, 102, 0 },
[IEEE80211_MODE_11G] = { 1, 2, 3, 47, 0 },
[IEEE80211_MODE_FH] = { 1, 2, 3, 102, 0 },
[IEEE80211_MODE_TURBO_A]= { 1, 2, 2, 47, 0 },
[IEEE80211_MODE_TURBO_G]= { 1, 2, 2, 47, 0 },
[IEEE80211_MODE_STURBO_A]={ 1, 2, 2, 47, 0 },
[IEEE80211_MODE_HALF] = { 1, 2, 3, 47, 0 },
[IEEE80211_MODE_QUARTER]= { 1, 2, 3, 47, 0 },
[IEEE80211_MODE_11NA] = { 1, 2, 3, 47, 0 },
[IEEE80211_MODE_11NG] = { 1, 2, 3, 47, 0 },
};
static const struct phyParamType bssPhyParamForAC_BE[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = { 3, 4, 10, 0, 0 },
[IEEE80211_MODE_11A] = { 3, 4, 10, 0, 0 },
[IEEE80211_MODE_11B] = { 3, 4, 10, 0, 0 },
[IEEE80211_MODE_11G] = { 3, 4, 10, 0, 0 },
[IEEE80211_MODE_FH] = { 3, 4, 10, 0, 0 },
[IEEE80211_MODE_TURBO_A]= { 2, 3, 10, 0, 0 },
[IEEE80211_MODE_TURBO_G]= { 2, 3, 10, 0, 0 },
[IEEE80211_MODE_STURBO_A]={ 2, 3, 10, 0, 0 },
[IEEE80211_MODE_HALF] = { 3, 4, 10, 0, 0 },
[IEEE80211_MODE_QUARTER]= { 3, 4, 10, 0, 0 },
[IEEE80211_MODE_11NA] = { 3, 4, 10, 0, 0 },
[IEEE80211_MODE_11NG] = { 3, 4, 10, 0, 0 },
};
static const struct phyParamType bssPhyParamForAC_VI[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = { 2, 3, 4, 94, 0 },
[IEEE80211_MODE_11A] = { 2, 3, 4, 94, 0 },
[IEEE80211_MODE_11B] = { 2, 3, 4, 188, 0 },
[IEEE80211_MODE_11G] = { 2, 3, 4, 94, 0 },
[IEEE80211_MODE_FH] = { 2, 3, 4, 188, 0 },
[IEEE80211_MODE_TURBO_A]= { 2, 2, 3, 94, 0 },
[IEEE80211_MODE_TURBO_G]= { 2, 2, 3, 94, 0 },
[IEEE80211_MODE_STURBO_A]={ 2, 2, 3, 94, 0 },
[IEEE80211_MODE_HALF] = { 2, 3, 4, 94, 0 },
[IEEE80211_MODE_QUARTER]= { 2, 3, 4, 94, 0 },
[IEEE80211_MODE_11NA] = { 2, 3, 4, 94, 0 },
[IEEE80211_MODE_11NG] = { 2, 3, 4, 94, 0 },
};
static const struct phyParamType bssPhyParamForAC_VO[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = { 2, 2, 3, 47, 0 },
[IEEE80211_MODE_11A] = { 2, 2, 3, 47, 0 },
[IEEE80211_MODE_11B] = { 2, 2, 3, 102, 0 },
[IEEE80211_MODE_11G] = { 2, 2, 3, 47, 0 },
[IEEE80211_MODE_FH] = { 2, 2, 3, 102, 0 },
[IEEE80211_MODE_TURBO_A]= { 1, 2, 2, 47, 0 },
[IEEE80211_MODE_TURBO_G]= { 1, 2, 2, 47, 0 },
[IEEE80211_MODE_STURBO_A]={ 1, 2, 2, 47, 0 },
[IEEE80211_MODE_HALF] = { 2, 2, 3, 47, 0 },
[IEEE80211_MODE_QUARTER]= { 2, 2, 3, 47, 0 },
[IEEE80211_MODE_11NA] = { 2, 2, 3, 47, 0 },
[IEEE80211_MODE_11NG] = { 2, 2, 3, 47, 0 },
};
static void
_setifsparams(struct wmeParams *wmep, const paramType *phy)
{
wmep->wmep_aifsn = phy->aifsn;
wmep->wmep_logcwmin = phy->logcwmin;
wmep->wmep_logcwmax = phy->logcwmax;
wmep->wmep_txopLimit = phy->txopLimit;
}
static void
setwmeparams(struct ieee80211vap *vap, const char *type, int ac,
struct wmeParams *wmep, const paramType *phy)
{
wmep->wmep_acm = phy->acm;
_setifsparams(wmep, phy);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
"set %s (%s) [acm %u aifsn %u logcwmin %u logcwmax %u txop %u]\n",
ieee80211_wme_acnames[ac], type,
wmep->wmep_acm, wmep->wmep_aifsn, wmep->wmep_logcwmin,
wmep->wmep_logcwmax, wmep->wmep_txopLimit);
}
static void
ieee80211_wme_initparams_locked(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_wme_state *wme = &ic->ic_wme;
const paramType *pPhyParam, *pBssPhyParam;
struct wmeParams *wmep;
enum ieee80211_phymode mode;
int i;
IEEE80211_LOCK_ASSERT(ic);
if ((ic->ic_caps & IEEE80211_C_WME) == 0 || ic->ic_nrunning > 1)
return;
/*
* Clear the wme cap_info field so a qoscount from a previous
* vap doesn't confuse later code which only parses the beacon
* field and updates hardware when said field changes.
* Otherwise the hardware is programmed with defaults, not what
* the beacon actually announces.
*/
wme->wme_wmeChanParams.cap_info = 0;
/*
* Select mode; we can be called early in which case we
* always use auto mode. We know we'll be called when
* entering the RUN state with bsschan setup properly
* so state will eventually get set correctly
*/
if (ic->ic_bsschan != IEEE80211_CHAN_ANYC)
mode = ieee80211_chan2mode(ic->ic_bsschan);
else
mode = IEEE80211_MODE_AUTO;
for (i = 0; i < WME_NUM_AC; i++) {
switch (i) {
case WME_AC_BK:
pPhyParam = &phyParamForAC_BK[mode];
pBssPhyParam = &phyParamForAC_BK[mode];
break;
case WME_AC_VI:
pPhyParam = &phyParamForAC_VI[mode];
pBssPhyParam = &bssPhyParamForAC_VI[mode];
break;
case WME_AC_VO:
pPhyParam = &phyParamForAC_VO[mode];
pBssPhyParam = &bssPhyParamForAC_VO[mode];
break;
case WME_AC_BE:
default:
pPhyParam = &phyParamForAC_BE[mode];
pBssPhyParam = &bssPhyParamForAC_BE[mode];
break;
}
wmep = &wme->wme_wmeChanParams.cap_wmeParams[i];
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
setwmeparams(vap, "chan", i, wmep, pPhyParam);
} else {
setwmeparams(vap, "chan", i, wmep, pBssPhyParam);
}
wmep = &wme->wme_wmeBssChanParams.cap_wmeParams[i];
setwmeparams(vap, "bss ", i, wmep, pBssPhyParam);
}
/* NB: check ic_bss to avoid NULL deref on initial attach */
if (vap->iv_bss != NULL) {
/*
* Calculate agressive mode switching threshold based
* on beacon interval. This doesn't need locking since
* we're only called before entering the RUN state at
* which point we start sending beacon frames.
*/
wme->wme_hipri_switch_thresh =
(HIGH_PRI_SWITCH_THRESH * vap->iv_bss->ni_intval) / 100;
wme->wme_flags &= ~WME_F_AGGRMODE;
ieee80211_wme_updateparams(vap);
}
}
void
ieee80211_wme_initparams(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
IEEE80211_LOCK(ic);
ieee80211_wme_initparams_locked(vap);
IEEE80211_UNLOCK(ic);
}
/*
* Update WME parameters for ourself and the BSS.
*/
void
ieee80211_wme_updateparams_locked(struct ieee80211vap *vap)
{
static const paramType aggrParam[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = { 2, 4, 10, 64, 0 },
[IEEE80211_MODE_11A] = { 2, 4, 10, 64, 0 },
[IEEE80211_MODE_11B] = { 2, 5, 10, 64, 0 },
[IEEE80211_MODE_11G] = { 2, 4, 10, 64, 0 },
[IEEE80211_MODE_FH] = { 2, 5, 10, 64, 0 },
[IEEE80211_MODE_TURBO_A] = { 1, 3, 10, 64, 0 },
[IEEE80211_MODE_TURBO_G] = { 1, 3, 10, 64, 0 },
[IEEE80211_MODE_STURBO_A] = { 1, 3, 10, 64, 0 },
[IEEE80211_MODE_HALF] = { 2, 4, 10, 64, 0 },
[IEEE80211_MODE_QUARTER] = { 2, 4, 10, 64, 0 },
[IEEE80211_MODE_11NA] = { 2, 4, 10, 64, 0 }, /* XXXcheck*/
[IEEE80211_MODE_11NG] = { 2, 4, 10, 64, 0 }, /* XXXcheck*/
};
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_wme_state *wme = &ic->ic_wme;
const struct wmeParams *wmep;
struct wmeParams *chanp, *bssp;
enum ieee80211_phymode mode;
int i;
/*
* Set up the channel access parameters for the physical
* device. First populate the configured settings.
*/
for (i = 0; i < WME_NUM_AC; i++) {
chanp = &wme->wme_chanParams.cap_wmeParams[i];
wmep = &wme->wme_wmeChanParams.cap_wmeParams[i];
chanp->wmep_aifsn = wmep->wmep_aifsn;
chanp->wmep_logcwmin = wmep->wmep_logcwmin;
chanp->wmep_logcwmax = wmep->wmep_logcwmax;
chanp->wmep_txopLimit = wmep->wmep_txopLimit;
chanp = &wme->wme_bssChanParams.cap_wmeParams[i];
wmep = &wme->wme_wmeBssChanParams.cap_wmeParams[i];
chanp->wmep_aifsn = wmep->wmep_aifsn;
chanp->wmep_logcwmin = wmep->wmep_logcwmin;
chanp->wmep_logcwmax = wmep->wmep_logcwmax;
chanp->wmep_txopLimit = wmep->wmep_txopLimit;
}
/*
* Select mode; we can be called early in which case we
* always use auto mode. We know we'll be called when
* entering the RUN state with bsschan setup properly
* so state will eventually get set correctly
*/
if (ic->ic_bsschan != IEEE80211_CHAN_ANYC)
mode = ieee80211_chan2mode(ic->ic_bsschan);
else
mode = IEEE80211_MODE_AUTO;
/*
* This implements agressive mode as found in certain
* vendors' AP's. When there is significant high
* priority (VI/VO) traffic in the BSS throttle back BE
* traffic by using conservative parameters. Otherwise
* BE uses agressive params to optimize performance of
* legacy/non-QoS traffic.
*/
if ((vap->iv_opmode == IEEE80211_M_HOSTAP &&
(wme->wme_flags & WME_F_AGGRMODE) != 0) ||
(vap->iv_opmode == IEEE80211_M_STA &&
(vap->iv_bss->ni_flags & IEEE80211_NODE_QOS) == 0) ||
(vap->iv_flags & IEEE80211_F_WME) == 0) {
chanp = &wme->wme_chanParams.cap_wmeParams[WME_AC_BE];
bssp = &wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE];
chanp->wmep_aifsn = bssp->wmep_aifsn = aggrParam[mode].aifsn;
chanp->wmep_logcwmin = bssp->wmep_logcwmin =
aggrParam[mode].logcwmin;
chanp->wmep_logcwmax = bssp->wmep_logcwmax =
aggrParam[mode].logcwmax;
chanp->wmep_txopLimit = bssp->wmep_txopLimit =
(vap->iv_flags & IEEE80211_F_BURST) ?
aggrParam[mode].txopLimit : 0;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
"update %s (chan+bss) [acm %u aifsn %u logcwmin %u "
"logcwmax %u txop %u]\n", ieee80211_wme_acnames[WME_AC_BE],
chanp->wmep_acm, chanp->wmep_aifsn, chanp->wmep_logcwmin,
chanp->wmep_logcwmax, chanp->wmep_txopLimit);
}
if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
ic->ic_sta_assoc < 2 && (wme->wme_flags & WME_F_AGGRMODE) != 0) {
static const uint8_t logCwMin[IEEE80211_MODE_MAX] = {
[IEEE80211_MODE_AUTO] = 3,
[IEEE80211_MODE_11A] = 3,
[IEEE80211_MODE_11B] = 4,
[IEEE80211_MODE_11G] = 3,
[IEEE80211_MODE_FH] = 4,
[IEEE80211_MODE_TURBO_A] = 3,
[IEEE80211_MODE_TURBO_G] = 3,
[IEEE80211_MODE_STURBO_A] = 3,
[IEEE80211_MODE_HALF] = 3,
[IEEE80211_MODE_QUARTER] = 3,
[IEEE80211_MODE_11NA] = 3,
[IEEE80211_MODE_11NG] = 3,
};
chanp = &wme->wme_chanParams.cap_wmeParams[WME_AC_BE];
bssp = &wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE];
chanp->wmep_logcwmin = bssp->wmep_logcwmin = logCwMin[mode];
IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
"update %s (chan+bss) logcwmin %u\n",
ieee80211_wme_acnames[WME_AC_BE], chanp->wmep_logcwmin);
}
if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* XXX ibss? */
/*
* Arrange for a beacon update and bump the parameter
* set number so associated stations load the new values.
*/
wme->wme_bssChanParams.cap_info =
(wme->wme_bssChanParams.cap_info+1) & WME_QOSINFO_COUNT;
ieee80211_beacon_notify(vap, IEEE80211_BEACON_WME);
}
wme->wme_update(ic);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
"%s: WME params updated, cap_info 0x%x\n", __func__,
vap->iv_opmode == IEEE80211_M_STA ?
wme->wme_wmeChanParams.cap_info :
wme->wme_bssChanParams.cap_info);
}
void
ieee80211_wme_updateparams(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
if (ic->ic_caps & IEEE80211_C_WME) {
IEEE80211_LOCK(ic);
ieee80211_wme_updateparams_locked(vap);
IEEE80211_UNLOCK(ic);
}
}
static void
parent_updown(void *arg, int npending)
{
struct ifnet *parent = arg;
parent->if_ioctl(parent, SIOCSIFFLAGS, NULL);
}
static void
update_mcast(void *arg, int npending)
{
struct ieee80211com *ic = arg;
struct ifnet *parent = ic->ic_ifp;
ic->ic_update_mcast(parent);
}
static void
update_promisc(void *arg, int npending)
{
struct ieee80211com *ic = arg;
struct ifnet *parent = ic->ic_ifp;
ic->ic_update_promisc(parent);
}
static void
update_channel(void *arg, int npending)
{
struct ieee80211com *ic = arg;
ic->ic_set_channel(ic);
ieee80211_radiotap_chan_change(ic);
}
/*
* Block until the parent is in a known state. This is
* used after any operations that dispatch a task (e.g.
* to auto-configure the parent device up/down).
*/
void
ieee80211_waitfor_parent(struct ieee80211com *ic)
{
taskqueue_block(ic->ic_tq);
ieee80211_draintask(ic, &ic->ic_parent_task);
ieee80211_draintask(ic, &ic->ic_mcast_task);
ieee80211_draintask(ic, &ic->ic_promisc_task);
ieee80211_draintask(ic, &ic->ic_chan_task);
ieee80211_draintask(ic, &ic->ic_bmiss_task);
taskqueue_unblock(ic->ic_tq);
}
/*
* Start a vap running. If this is the first vap to be
* set running on the underlying device then we
* automatically bring the device up.
*/
void
ieee80211_start_locked(struct ieee80211vap *vap)
{
struct ifnet *ifp = vap->iv_ifp;
struct ieee80211com *ic = vap->iv_ic;
struct ifnet *parent = ic->ic_ifp;
IEEE80211_LOCK_ASSERT(ic);
IEEE80211_DPRINTF(vap,
IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
"start running, %d vaps running\n", ic->ic_nrunning);
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
/*
* Mark us running. Note that it's ok to do this first;
* if we need to bring the parent device up we defer that
* to avoid dropping the com lock. We expect the device
* to respond to being marked up by calling back into us
* through ieee80211_start_all at which point we'll come
* back in here and complete the work.
*/
ifp->if_drv_flags |= IFF_DRV_RUNNING;
/*
* We are not running; if this we are the first vap
* to be brought up auto-up the parent if necessary.
*/
if (ic->ic_nrunning++ == 0 &&
(parent->if_drv_flags & IFF_DRV_RUNNING) == 0) {
IEEE80211_DPRINTF(vap,
IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
"%s: up parent %s\n", __func__, parent->if_xname);
parent->if_flags |= IFF_UP;
ieee80211_runtask(ic, &ic->ic_parent_task);
return;
}
}
/*
* If the parent is up and running, then kick the
* 802.11 state machine as appropriate.
*/
if ((parent->if_drv_flags & IFF_DRV_RUNNING) &&
vap->iv_roaming != IEEE80211_ROAMING_MANUAL) {
if (vap->iv_opmode == IEEE80211_M_STA) {
#if 0
/* XXX bypasses scan too easily; disable for now */
/*
* Try to be intelligent about clocking the state
* machine. If we're currently in RUN state then
* we should be able to apply any new state/parameters
* simply by re-associating. Otherwise we need to
* re-scan to select an appropriate ap.
*/
if (vap->iv_state >= IEEE80211_S_RUN)
ieee80211_new_state_locked(vap,
IEEE80211_S_ASSOC, 1);
else
#endif
ieee80211_new_state_locked(vap,
IEEE80211_S_SCAN, 0);
} else {
/*
* For monitor+wds mode there's nothing to do but
* start running. Otherwise if this is the first
* vap to be brought up, start a scan which may be
* preempted if the station is locked to a particular
* channel.
*/
vap->iv_flags_ext |= IEEE80211_FEXT_REINIT;
if (vap->iv_opmode == IEEE80211_M_MONITOR ||
vap->iv_opmode == IEEE80211_M_WDS)
ieee80211_new_state_locked(vap,
IEEE80211_S_RUN, -1);
else
ieee80211_new_state_locked(vap,
IEEE80211_S_SCAN, 0);
}
}
}
/*
* Start a single vap.
*/
void
ieee80211_init(void *arg)
{
struct ieee80211vap *vap = arg;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
"%s\n", __func__);
IEEE80211_LOCK(vap->iv_ic);
ieee80211_start_locked(vap);
IEEE80211_UNLOCK(vap->iv_ic);
}
/*
* Start all runnable vap's on a device.
*/
void
ieee80211_start_all(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
IEEE80211_LOCK(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
struct ifnet *ifp = vap->iv_ifp;
if (IFNET_IS_UP_RUNNING(ifp)) /* NB: avoid recursion */
ieee80211_start_locked(vap);
}
IEEE80211_UNLOCK(ic);
}
/*
* Stop a vap. We force it down using the state machine
* then mark it's ifnet not running. If this is the last
* vap running on the underlying device then we close it
* too to insure it will be properly initialized when the
* next vap is brought up.
*/
void
ieee80211_stop_locked(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
struct ifnet *ifp = vap->iv_ifp;
struct ifnet *parent = ic->ic_ifp;
IEEE80211_LOCK_ASSERT(ic);
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
"stop running, %d vaps running\n", ic->ic_nrunning);
ieee80211_new_state_locked(vap, IEEE80211_S_INIT, -1);
if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
ifp->if_drv_flags &= ~IFF_DRV_RUNNING; /* mark us stopped */
if (--ic->ic_nrunning == 0 &&
(parent->if_drv_flags & IFF_DRV_RUNNING)) {
IEEE80211_DPRINTF(vap,
IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
"down parent %s\n", parent->if_xname);
parent->if_flags &= ~IFF_UP;
ieee80211_runtask(ic, &ic->ic_parent_task);
}
}
}
void
ieee80211_stop(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
IEEE80211_LOCK(ic);
ieee80211_stop_locked(vap);
IEEE80211_UNLOCK(ic);
}
/*
* Stop all vap's running on a device.
*/
void
ieee80211_stop_all(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
IEEE80211_LOCK(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
struct ifnet *ifp = vap->iv_ifp;
if (IFNET_IS_UP_RUNNING(ifp)) /* NB: avoid recursion */
ieee80211_stop_locked(vap);
}
IEEE80211_UNLOCK(ic);
ieee80211_waitfor_parent(ic);
}
/*
* Stop all vap's running on a device and arrange
* for those that were running to be resumed.
*/
void
ieee80211_suspend_all(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
IEEE80211_LOCK(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
struct ifnet *ifp = vap->iv_ifp;
if (IFNET_IS_UP_RUNNING(ifp)) { /* NB: avoid recursion */
vap->iv_flags_ext |= IEEE80211_FEXT_RESUME;
ieee80211_stop_locked(vap);
}
}
IEEE80211_UNLOCK(ic);
ieee80211_waitfor_parent(ic);
}
/*
* Start all vap's marked for resume.
*/
void
ieee80211_resume_all(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
IEEE80211_LOCK(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
struct ifnet *ifp = vap->iv_ifp;
if (!IFNET_IS_UP_RUNNING(ifp) &&
(vap->iv_flags_ext & IEEE80211_FEXT_RESUME)) {
vap->iv_flags_ext &= ~IEEE80211_FEXT_RESUME;
ieee80211_start_locked(vap);
}
}
IEEE80211_UNLOCK(ic);
}
void
ieee80211_beacon_miss(struct ieee80211com *ic)
{
IEEE80211_LOCK(ic);
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
/* Process in a taskq, the handler may reenter the driver */
ieee80211_runtask(ic, &ic->ic_bmiss_task);
}
IEEE80211_UNLOCK(ic);
}
static void
beacon_miss(void *arg, int npending)
{
struct ieee80211com *ic = arg;
struct ieee80211vap *vap;
IEEE80211_LOCK(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
/*
* We only pass events through for sta vap's in RUN state;
* may be too restrictive but for now this saves all the
* handlers duplicating these checks.
*/
if (vap->iv_opmode == IEEE80211_M_STA &&
vap->iv_state >= IEEE80211_S_RUN &&
vap->iv_bmiss != NULL)
vap->iv_bmiss(vap);
}
IEEE80211_UNLOCK(ic);
}
static void
beacon_swmiss(void *arg, int npending)
{
struct ieee80211vap *vap = arg;
struct ieee80211com *ic = vap->iv_ic;
IEEE80211_LOCK(ic);
if (vap->iv_state == IEEE80211_S_RUN) {
/* XXX Call multiple times if npending > zero? */
vap->iv_bmiss(vap);
}
IEEE80211_UNLOCK(ic);
}
/*
* Software beacon miss handling. Check if any beacons
* were received in the last period. If not post a
* beacon miss; otherwise reset the counter.
*/
void
ieee80211_swbmiss(void *arg)
{
struct ieee80211vap *vap = arg;
struct ieee80211com *ic = vap->iv_ic;
IEEE80211_LOCK_ASSERT(ic);
/* XXX sleep state? */
KASSERT(vap->iv_state == IEEE80211_S_RUN,
("wrong state %d", vap->iv_state));
if (ic->ic_flags & IEEE80211_F_SCAN) {
/*
* If scanning just ignore and reset state. If we get a
* bmiss after coming out of scan because we haven't had
* time to receive a beacon then we should probe the AP
* before posting a real bmiss (unless iv_bmiss_max has
* been artifiically lowered). A cleaner solution might
* be to disable the timer on scan start/end but to handle
* case of multiple sta vap's we'd need to disable the
* timers of all affected vap's.
*/
vap->iv_swbmiss_count = 0;
} else if (vap->iv_swbmiss_count == 0) {
if (vap->iv_bmiss != NULL)
ieee80211_runtask(ic, &vap->iv_swbmiss_task);
} else
vap->iv_swbmiss_count = 0;
callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
ieee80211_swbmiss, vap);
}
/*
* Start an 802.11h channel switch. We record the parameters,
* mark the operation pending, notify each vap through the
* beacon update mechanism so it can update the beacon frame
* contents, and then switch vap's to CSA state to block outbound
* traffic. Devices that handle CSA directly can use the state
* switch to do the right thing so long as they call
* ieee80211_csa_completeswitch when it's time to complete the
* channel change. Devices that depend on the net80211 layer can
* use ieee80211_beacon_update to handle the countdown and the
* channel switch.
*/
void
ieee80211_csa_startswitch(struct ieee80211com *ic,
struct ieee80211_channel *c, int mode, int count)
{
struct ieee80211vap *vap;
IEEE80211_LOCK_ASSERT(ic);
ic->ic_csa_newchan = c;
ic->ic_csa_mode = mode;
ic->ic_csa_count = count;
ic->ic_flags |= IEEE80211_F_CSAPENDING;
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
vap->iv_opmode == IEEE80211_M_IBSS ||
vap->iv_opmode == IEEE80211_M_MBSS)
ieee80211_beacon_notify(vap, IEEE80211_BEACON_CSA);
/* switch to CSA state to block outbound traffic */
if (vap->iv_state == IEEE80211_S_RUN)
ieee80211_new_state_locked(vap, IEEE80211_S_CSA, 0);
}
ieee80211_notify_csa(ic, c, mode, count);
}
/*
* Complete the channel switch by transitioning all CSA VAPs to RUN.
* This is called by both the completion and cancellation functions
* so each VAP is placed back in the RUN state and can thus transmit.
*/
static void
csa_completeswitch(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
ic->ic_csa_newchan = NULL;
ic->ic_flags &= ~IEEE80211_F_CSAPENDING;
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_state == IEEE80211_S_CSA)
ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
}
/*
* Complete an 802.11h channel switch started by ieee80211_csa_startswitch.
* We clear state and move all vap's in CSA state to RUN state
* so they can again transmit.
*
* Although this may not be completely correct, update the BSS channel
* for each VAP to the newly configured channel. The setcurchan sets
* the current operating channel for the interface (so the radio does
* switch over) but the VAP BSS isn't updated, leading to incorrectly
* reported information via ioctl.
*/
void
ieee80211_csa_completeswitch(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
IEEE80211_LOCK_ASSERT(ic);
KASSERT(ic->ic_flags & IEEE80211_F_CSAPENDING, ("csa not pending"));
ieee80211_setcurchan(ic, ic->ic_csa_newchan);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_state == IEEE80211_S_CSA)
vap->iv_bss->ni_chan = ic->ic_curchan;
csa_completeswitch(ic);
}
/*
* Cancel an 802.11h channel switch started by ieee80211_csa_startswitch.
* We clear state and move all vap's in CSA state to RUN state
* so they can again transmit.
*/
void
ieee80211_csa_cancelswitch(struct ieee80211com *ic)
{
IEEE80211_LOCK_ASSERT(ic);
csa_completeswitch(ic);
}
/*
* Complete a DFS CAC started by ieee80211_dfs_cac_start.
* We clear state and move all vap's in CAC state to RUN state.
*/
void
ieee80211_cac_completeswitch(struct ieee80211vap *vap0)
{
struct ieee80211com *ic = vap0->iv_ic;
struct ieee80211vap *vap;
IEEE80211_LOCK(ic);
/*
* Complete CAC state change for lead vap first; then
* clock all the other vap's waiting.
*/
KASSERT(vap0->iv_state == IEEE80211_S_CAC,
("wrong state %d", vap0->iv_state));
ieee80211_new_state_locked(vap0, IEEE80211_S_RUN, 0);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
if (vap->iv_state == IEEE80211_S_CAC)
ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
IEEE80211_UNLOCK(ic);
}
/*
* Force all vap's other than the specified vap to the INIT state
* and mark them as waiting for a scan to complete. These vaps
* will be brought up when the scan completes and the scanning vap
* reaches RUN state by wakeupwaiting.
*/
static void
markwaiting(struct ieee80211vap *vap0)
{
struct ieee80211com *ic = vap0->iv_ic;
struct ieee80211vap *vap;
IEEE80211_LOCK_ASSERT(ic);
/*
* A vap list entry can not disappear since we are running on the
* taskqueue and a vap destroy will queue and drain another state
* change task.
*/
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
if (vap == vap0)
continue;
if (vap->iv_state != IEEE80211_S_INIT) {
/* NB: iv_newstate may drop the lock */
vap->iv_newstate(vap, IEEE80211_S_INIT, 0);
vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
}
}
}
/*
* Wakeup all vap's waiting for a scan to complete. This is the
* companion to markwaiting (above) and is used to coordinate
* multiple vaps scanning.
* This is called from the state taskqueue.
*/
static void
wakeupwaiting(struct ieee80211vap *vap0)
{
struct ieee80211com *ic = vap0->iv_ic;
struct ieee80211vap *vap;
IEEE80211_LOCK_ASSERT(ic);
/*
* A vap list entry can not disappear since we are running on the
* taskqueue and a vap destroy will queue and drain another state
* change task.
*/
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
if (vap == vap0)
continue;
if (vap->iv_flags_ext & IEEE80211_FEXT_SCANWAIT) {
vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANWAIT;
/* NB: sta's cannot go INIT->RUN */
/* NB: iv_newstate may drop the lock */
vap->iv_newstate(vap,
vap->iv_opmode == IEEE80211_M_STA ?
IEEE80211_S_SCAN : IEEE80211_S_RUN, 0);
}
}
}
/*
* Handle post state change work common to all operating modes.
*/
static void
ieee80211_newstate_cb(void *xvap, int npending)
{
struct ieee80211vap *vap = xvap;
struct ieee80211com *ic = vap->iv_ic;
enum ieee80211_state nstate, ostate;
int arg, rc;
IEEE80211_LOCK(ic);
nstate = vap->iv_nstate;
arg = vap->iv_nstate_arg;
if (vap->iv_flags_ext & IEEE80211_FEXT_REINIT) {
/*
* We have been requested to drop back to the INIT before
* proceeding to the new state.
*/
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: %s -> %s arg %d\n", __func__,
ieee80211_state_name[vap->iv_state],
ieee80211_state_name[IEEE80211_S_INIT], arg);
vap->iv_newstate(vap, IEEE80211_S_INIT, arg);
vap->iv_flags_ext &= ~IEEE80211_FEXT_REINIT;
}
ostate = vap->iv_state;
if (nstate == IEEE80211_S_SCAN && ostate != IEEE80211_S_INIT) {
/*
* SCAN was forced; e.g. on beacon miss. Force other running
* vap's to INIT state and mark them as waiting for the scan to
* complete. This insures they don't interfere with our
* scanning. Since we are single threaded the vaps can not
* transition again while we are executing.
*
* XXX not always right, assumes ap follows sta
*/
markwaiting(vap);
}
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: %s -> %s arg %d\n", __func__,
ieee80211_state_name[ostate], ieee80211_state_name[nstate], arg);
rc = vap->iv_newstate(vap, nstate, arg);
vap->iv_flags_ext &= ~IEEE80211_FEXT_STATEWAIT;
if (rc != 0) {
/* State transition failed */
KASSERT(rc != EINPROGRESS, ("iv_newstate was deferred"));
KASSERT(nstate != IEEE80211_S_INIT,
("INIT state change failed"));
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: %s returned error %d\n", __func__,
ieee80211_state_name[nstate], rc);
goto done;
}
/* No actual transition, skip post processing */
if (ostate == nstate)
goto done;
if (nstate == IEEE80211_S_RUN) {
/*
* OACTIVE may be set on the vap if the upper layer
* tried to transmit (e.g. IPv6 NDP) before we reach
* RUN state. Clear it and restart xmit.
*
* Note this can also happen as a result of SLEEP->RUN
* (i.e. coming out of power save mode).
*/
vap->iv_ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
if_start(vap->iv_ifp);
/* bring up any vaps waiting on us */
wakeupwaiting(vap);
} else if (nstate == IEEE80211_S_INIT) {
/*
* Flush the scan cache if we did the last scan (XXX?)
* and flush any frames on send queues from this vap.
* Note the mgt q is used only for legacy drivers and
* will go away shortly.
*/
ieee80211_scan_flush(vap);
/* XXX NB: cast for altq */
ieee80211_flush_ifq((struct ifqueue *)&ic->ic_ifp->if_snd, vap);
}
done:
IEEE80211_UNLOCK(ic);
}
/*
* Public interface for initiating a state machine change.
* This routine single-threads the request and coordinates
* the scheduling of multiple vaps for the purpose of selecting
* an operating channel. Specifically the following scenarios
* are handled:
* o only one vap can be selecting a channel so on transition to
* SCAN state if another vap is already scanning then
* mark the caller for later processing and return without
* doing anything (XXX? expectations by caller of synchronous operation)
* o only one vap can be doing CAC of a channel so on transition to
* CAC state if another vap is already scanning for radar then
* mark the caller for later processing and return without
* doing anything (XXX? expectations by caller of synchronous operation)
* o if another vap is already running when a request is made
* to SCAN then an operating channel has been chosen; bypass
* the scan and just join the channel
*
* Note that the state change call is done through the iv_newstate
* method pointer so any driver routine gets invoked. The driver
* will normally call back into operating mode-specific
* ieee80211_newstate routines (below) unless it needs to completely
* bypass the state machine (e.g. because the firmware has it's
* own idea how things should work). Bypassing the net80211 layer
* is usually a mistake and indicates lack of proper integration
* with the net80211 layer.
*/
static int
ieee80211_new_state_locked(struct ieee80211vap *vap,
enum ieee80211_state nstate, int arg)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211vap *vp;
enum ieee80211_state ostate;
int nrunning, nscanning;
IEEE80211_LOCK_ASSERT(ic);
if (vap->iv_flags_ext & IEEE80211_FEXT_STATEWAIT) {
if (vap->iv_nstate == IEEE80211_S_INIT) {
/*
* XXX The vap is being stopped, do no allow any other
* state changes until this is completed.
*/
return -1;
} else if (vap->iv_state != vap->iv_nstate) {
#if 0
/* Warn if the previous state hasn't completed. */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: pending %s -> %s transition lost\n", __func__,
ieee80211_state_name[vap->iv_state],
ieee80211_state_name[vap->iv_nstate]);
#else
/* XXX temporarily enable to identify issues */
if_printf(vap->iv_ifp,
"%s: pending %s -> %s transition lost\n",
__func__, ieee80211_state_name[vap->iv_state],
ieee80211_state_name[vap->iv_nstate]);
#endif
}
}
nrunning = nscanning = 0;
/* XXX can track this state instead of calculating */
TAILQ_FOREACH(vp, &ic->ic_vaps, iv_next) {
if (vp != vap) {
if (vp->iv_state >= IEEE80211_S_RUN)
nrunning++;
/* XXX doesn't handle bg scan */
/* NB: CAC+AUTH+ASSOC treated like SCAN */
else if (vp->iv_state > IEEE80211_S_INIT)
nscanning++;
}
}
ostate = vap->iv_state;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: %s -> %s (nrunning %d nscanning %d)\n", __func__,
ieee80211_state_name[ostate], ieee80211_state_name[nstate],
nrunning, nscanning);
switch (nstate) {
case IEEE80211_S_SCAN:
if (ostate == IEEE80211_S_INIT) {
/*
* INIT -> SCAN happens on initial bringup.
*/
KASSERT(!(nscanning && nrunning),
("%d scanning and %d running", nscanning, nrunning));
if (nscanning) {
/*
* Someone is scanning, defer our state
* change until the work has completed.
*/
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: defer %s -> %s\n",
__func__, ieee80211_state_name[ostate],
ieee80211_state_name[nstate]);
vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
return 0;
}
if (nrunning) {
/*
* Someone is operating; just join the channel
* they have chosen.
*/
/* XXX kill arg? */
/* XXX check each opmode, adhoc? */
if (vap->iv_opmode == IEEE80211_M_STA)
nstate = IEEE80211_S_SCAN;
else
nstate = IEEE80211_S_RUN;
#ifdef IEEE80211_DEBUG
if (nstate != IEEE80211_S_SCAN) {
IEEE80211_DPRINTF(vap,
IEEE80211_MSG_STATE,
"%s: override, now %s -> %s\n",
__func__,
ieee80211_state_name[ostate],
ieee80211_state_name[nstate]);
}
#endif
}
}
break;
case IEEE80211_S_RUN:
if (vap->iv_opmode == IEEE80211_M_WDS &&
(vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) &&
nscanning) {
/*
* Legacy WDS with someone else scanning; don't
* go online until that completes as we should
* follow the other vap to the channel they choose.
*/
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: defer %s -> %s (legacy WDS)\n", __func__,
ieee80211_state_name[ostate],
ieee80211_state_name[nstate]);
vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
return 0;
}
if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
(vap->iv_flags_ext & IEEE80211_FEXT_DFS) &&
!IEEE80211_IS_CHAN_CACDONE(ic->ic_bsschan)) {
/*
* This is a DFS channel, transition to CAC state
* instead of RUN. This allows us to initiate
* Channel Availability Check (CAC) as specified
* by 11h/DFS.
*/
nstate = IEEE80211_S_CAC;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: override %s -> %s (DFS)\n", __func__,
ieee80211_state_name[ostate],
ieee80211_state_name[nstate]);
}
break;
case IEEE80211_S_INIT:
/* cancel any scan in progress */
ieee80211_cancel_scan(vap);
if (ostate == IEEE80211_S_INIT ) {
/* XXX don't believe this */
/* INIT -> INIT. nothing to do */
vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANWAIT;
}
/* fall thru... */
default:
break;
}
/* defer the state change to a thread */
vap->iv_nstate = nstate;
vap->iv_nstate_arg = arg;
vap->iv_flags_ext |= IEEE80211_FEXT_STATEWAIT;
ieee80211_runtask(ic, &vap->iv_nstate_task);
return EINPROGRESS;
}
int
ieee80211_new_state(struct ieee80211vap *vap,
enum ieee80211_state nstate, int arg)
{
struct ieee80211com *ic = vap->iv_ic;
int rc;
IEEE80211_LOCK(ic);
rc = ieee80211_new_state_locked(vap, nstate, arg);
IEEE80211_UNLOCK(ic);
return rc;
}
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