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f-stack/freebsd/net80211/ieee80211_sta.c

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/*-
* Copyright (c) 2007-2008 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>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif
/*
* IEEE 802.11 Station mode support.
*/
#include "opt_inet.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/if_llc.h>
#include <net/if_dl.h>
#include <net/if_var.h>
#include <net/ethernet.h>
#include <net/bpf.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_sta.h>
#include <net80211/ieee80211_input.h>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/ieee80211_superg.h>
#endif
#include <net80211/ieee80211_ratectl.h>
#include <net80211/ieee80211_sta.h>
#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
static void sta_vattach(struct ieee80211vap *);
static void sta_beacon_miss(struct ieee80211vap *);
static int sta_newstate(struct ieee80211vap *, enum ieee80211_state, int);
static int sta_input(struct ieee80211_node *, struct mbuf *,
const struct ieee80211_rx_stats *, int, int);
static void sta_recv_mgmt(struct ieee80211_node *, struct mbuf *,
int subtype, const struct ieee80211_rx_stats *, int rssi, int nf);
static void sta_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
void
ieee80211_sta_attach(struct ieee80211com *ic)
{
ic->ic_vattach[IEEE80211_M_STA] = sta_vattach;
}
void
ieee80211_sta_detach(struct ieee80211com *ic)
{
}
static void
sta_vdetach(struct ieee80211vap *vap)
{
}
static void
sta_vattach(struct ieee80211vap *vap)
{
vap->iv_newstate = sta_newstate;
vap->iv_input = sta_input;
vap->iv_recv_mgmt = sta_recv_mgmt;
vap->iv_recv_ctl = sta_recv_ctl;
vap->iv_opdetach = sta_vdetach;
vap->iv_bmiss = sta_beacon_miss;
}
/*
* Handle a beacon miss event. The common code filters out
* spurious events that can happen when scanning and/or before
* reaching RUN state.
*/
static void
sta_beacon_miss(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
IEEE80211_LOCK_ASSERT(ic);
KASSERT((ic->ic_flags & IEEE80211_F_SCAN) == 0, ("scanning"));
KASSERT(vap->iv_state >= IEEE80211_S_RUN,
("wrong state %s", ieee80211_state_name[vap->iv_state]));
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
"beacon miss, mode %s state %s\n",
ieee80211_opmode_name[vap->iv_opmode],
ieee80211_state_name[vap->iv_state]);
if (vap->iv_state == IEEE80211_S_CSA) {
/*
* A Channel Switch is pending; assume we missed the
* beacon that would've completed the process and just
* force the switch. If we made a mistake we'll not
* find the AP on the new channel and fall back to a
* normal scan.
*/
ieee80211_csa_completeswitch(ic);
return;
}
if (++vap->iv_bmiss_count < vap->iv_bmiss_max) {
/*
* Send a directed probe req before falling back to a
* scan; if we receive a response ic_bmiss_count will
* be reset. Some cards mistakenly report beacon miss
* so this avoids the expensive scan if the ap is
* still there.
*/
ieee80211_send_probereq(vap->iv_bss, vap->iv_myaddr,
vap->iv_bss->ni_bssid, vap->iv_bss->ni_bssid,
vap->iv_bss->ni_essid, vap->iv_bss->ni_esslen);
return;
}
callout_stop(&vap->iv_swbmiss);
vap->iv_bmiss_count = 0;
vap->iv_stats.is_beacon_miss++;
if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
#ifdef IEEE80211_SUPPORT_SUPERG
/*
* If we receive a beacon miss interrupt when using
* dynamic turbo, attempt to switch modes before
* reassociating.
*/
if (IEEE80211_ATH_CAP(vap, vap->iv_bss, IEEE80211_NODE_TURBOP))
ieee80211_dturbo_switch(vap,
ic->ic_bsschan->ic_flags ^ IEEE80211_CHAN_TURBO);
#endif
/*
* Try to reassociate before scanning for a new ap.
*/
ieee80211_new_state(vap, IEEE80211_S_ASSOC, 1);
} else {
/*
* Somebody else is controlling state changes (e.g.
* a user-mode app) don't do anything that would
* confuse them; just drop into scan mode so they'll
* notified of the state change and given control.
*/
ieee80211_new_state(vap, IEEE80211_S_SCAN, 0);
}
}
/*
* Handle deauth with reason. We retry only for
* the cases where we might succeed. Otherwise
* we downgrade the ap and scan.
*/
static void
sta_authretry(struct ieee80211vap *vap, struct ieee80211_node *ni, int reason)
{
switch (reason) {
case IEEE80211_STATUS_SUCCESS: /* NB: MLME assoc */
case IEEE80211_STATUS_TIMEOUT:
case IEEE80211_REASON_ASSOC_EXPIRE:
case IEEE80211_REASON_NOT_AUTHED:
case IEEE80211_REASON_NOT_ASSOCED:
case IEEE80211_REASON_ASSOC_LEAVE:
case IEEE80211_REASON_ASSOC_NOT_AUTHED:
IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, 1);
break;
default:
ieee80211_scan_assoc_fail(vap, vap->iv_bss->ni_macaddr, reason);
if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
ieee80211_check_scan_current(vap);
break;
}
}
static void
sta_swbmiss_start(struct ieee80211vap *vap)
{
if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS) {
/*
* Start s/w beacon miss timer for devices w/o
* hardware support. We fudge a bit here since
* we're doing this in software.
*/
vap->iv_swbmiss_period = IEEE80211_TU_TO_TICKS(
2 * vap->iv_bmissthreshold * vap->iv_bss->ni_intval);
vap->iv_swbmiss_count = 0;
callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
ieee80211_swbmiss, vap);
}
}
/*
* IEEE80211_M_STA vap state machine handler.
* This routine handles the main states in the 802.11 protocol.
*/
static int
sta_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
enum ieee80211_state ostate;
IEEE80211_LOCK_ASSERT(ic);
ostate = vap->iv_state;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
__func__, ieee80211_state_name[ostate],
ieee80211_state_name[nstate], arg);
vap->iv_state = nstate; /* state transition */
callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
if (ostate != IEEE80211_S_SCAN)
ieee80211_cancel_scan(vap); /* background scan */
ni = vap->iv_bss; /* NB: no reference held */
if (vap->iv_flags_ext & IEEE80211_FEXT_SWBMISS)
callout_stop(&vap->iv_swbmiss);
switch (nstate) {
case IEEE80211_S_INIT:
switch (ostate) {
case IEEE80211_S_SLEEP:
/* XXX wakeup */
/* XXX driver hook to wakeup the hardware? */
case IEEE80211_S_RUN:
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_ASSOC_LEAVE);
ieee80211_sta_leave(ni);
break;
case IEEE80211_S_ASSOC:
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_AUTH_LEAVE);
break;
case IEEE80211_S_SCAN:
ieee80211_cancel_scan(vap);
break;
default:
break;
}
if (ostate != IEEE80211_S_INIT) {
/* NB: optimize INIT -> INIT case */
ieee80211_reset_bss(vap);
}
if (vap->iv_auth->ia_detach != NULL)
vap->iv_auth->ia_detach(vap);
break;
case IEEE80211_S_SCAN:
switch (ostate) {
case IEEE80211_S_INIT:
/*
* Initiate a scan. We can come here as a result
* of an IEEE80211_IOC_SCAN_REQ too in which case
* the vap will be marked with IEEE80211_FEXT_SCANREQ
* and the scan request parameters will be present
* in iv_scanreq. Otherwise we do the default.
*/
if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
ieee80211_check_scan(vap,
vap->iv_scanreq_flags,
vap->iv_scanreq_duration,
vap->iv_scanreq_mindwell,
vap->iv_scanreq_maxdwell,
vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
} else
ieee80211_check_scan_current(vap);
break;
case IEEE80211_S_SCAN:
case IEEE80211_S_AUTH:
case IEEE80211_S_ASSOC:
/*
* These can happen either because of a timeout
* on an assoc/auth response or because of a
* change in state that requires a reset. For
* the former we're called with a non-zero arg
* that is the cause for the failure; pass this
* to the scan code so it can update state.
* Otherwise trigger a new scan unless we're in
* manual roaming mode in which case an application
* must issue an explicit scan request.
*/
if (arg != 0)
ieee80211_scan_assoc_fail(vap,
vap->iv_bss->ni_macaddr, arg);
if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
ieee80211_check_scan_current(vap);
break;
case IEEE80211_S_SLEEP: /* beacon miss */
/*
* XXX if in sleep we need to wakeup the hardware.
*/
/* FALLTHROUGH */
case IEEE80211_S_RUN: /* beacon miss */
/*
* Beacon miss. Notify user space and if not
* under control of a user application (roaming
* manual) kick off a scan to re-connect.
*/
ieee80211_sta_leave(ni);
if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
ieee80211_check_scan_current(vap);
break;
default:
goto invalid;
}
break;
case IEEE80211_S_AUTH:
switch (ostate) {
case IEEE80211_S_INIT:
case IEEE80211_S_SCAN:
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_AUTH, 1);
break;
case IEEE80211_S_AUTH:
case IEEE80211_S_ASSOC:
switch (arg & 0xff) {
case IEEE80211_FC0_SUBTYPE_AUTH:
/* ??? */
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_AUTH, 2);
break;
case IEEE80211_FC0_SUBTYPE_DEAUTH:
sta_authretry(vap, ni, arg>>8);
break;
}
break;
case IEEE80211_S_SLEEP:
case IEEE80211_S_RUN:
switch (arg & 0xff) {
case IEEE80211_FC0_SUBTYPE_AUTH:
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_AUTH, 2);
vap->iv_state = IEEE80211_S_RUN; /* stay RUN */
break;
case IEEE80211_FC0_SUBTYPE_DEAUTH:
ieee80211_sta_leave(ni);
if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
/* try to reauth */
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_AUTH, 1);
}
break;
}
break;
default:
goto invalid;
}
break;
case IEEE80211_S_ASSOC:
switch (ostate) {
case IEEE80211_S_AUTH:
case IEEE80211_S_ASSOC:
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
break;
case IEEE80211_S_SLEEP: /* cannot happen */
case IEEE80211_S_RUN:
ieee80211_sta_leave(ni);
if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) {
IEEE80211_SEND_MGMT(ni, arg ?
IEEE80211_FC0_SUBTYPE_REASSOC_REQ :
IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0);
}
break;
default:
goto invalid;
}
break;
case IEEE80211_S_RUN:
if (vap->iv_flags & IEEE80211_F_WPA) {
/* XXX validate prerequisites */
}
switch (ostate) {
case IEEE80211_S_RUN:
case IEEE80211_S_CSA:
break;
case IEEE80211_S_AUTH: /* when join is done in fw */
case IEEE80211_S_ASSOC:
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_debug(vap)) {
ieee80211_note(vap, "%s with %s ssid ",
(vap->iv_opmode == IEEE80211_M_STA ?
"associated" : "synchronized"),
ether_sprintf(ni->ni_bssid));
ieee80211_print_essid(vap->iv_bss->ni_essid,
ni->ni_esslen);
/* XXX MCS/HT */
printf(" channel %d start %uMb\n",
ieee80211_chan2ieee(ic, ic->ic_curchan),
IEEE80211_RATE2MBS(ni->ni_txrate));
}
#endif
ieee80211_scan_assoc_success(vap, ni->ni_macaddr);
ieee80211_notify_node_join(ni,
arg == IEEE80211_FC0_SUBTYPE_ASSOC_RESP);
break;
case IEEE80211_S_SLEEP:
/* Wake up from sleep */
vap->iv_sta_ps(vap, 0);
break;
default:
goto invalid;
}
ieee80211_sync_curchan(ic);
if (ostate != IEEE80211_S_RUN)
sta_swbmiss_start(vap);
/*
* When 802.1x is not in use mark the port authorized
* at this point so traffic can flow.
*/
if (ni->ni_authmode != IEEE80211_AUTH_8021X)
ieee80211_node_authorize(ni);
/*
* Fake association when joining an existing bss.
*
* Don't do this if we're doing SLEEP->RUN.
*/
if (ic->ic_newassoc != NULL && ostate != IEEE80211_S_SLEEP)
ic->ic_newassoc(vap->iv_bss, (ostate != IEEE80211_S_RUN));
break;
case IEEE80211_S_CSA:
if (ostate != IEEE80211_S_RUN)
goto invalid;
break;
case IEEE80211_S_SLEEP:
sta_swbmiss_start(vap);
vap->iv_sta_ps(vap, 1);
break;
default:
invalid:
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
"%s: unexpected state transition %s -> %s\n", __func__,
ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
break;
}
return 0;
}
/*
* Return non-zero if the frame is an echo of a multicast
* frame sent by ourself. The dir is known to be DSTODS.
*/
static __inline int
isdstods_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
{
#define QWH4(wh) ((const struct ieee80211_qosframe_addr4 *)wh)
#define WH4(wh) ((const struct ieee80211_frame_addr4 *)wh)
const uint8_t *sa;
KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
if (!IEEE80211_IS_MULTICAST(wh->i_addr3))
return 0;
sa = IEEE80211_QOS_HAS_SEQ(wh) ? QWH4(wh)->i_addr4 : WH4(wh)->i_addr4;
return IEEE80211_ADDR_EQ(sa, vap->iv_myaddr);
#undef WH4
#undef QWH4
}
/*
* Return non-zero if the frame is an echo of a multicast
* frame sent by ourself. The dir is known to be FROMDS.
*/
static __inline int
isfromds_mcastecho(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
{
KASSERT(vap->iv_opmode == IEEE80211_M_STA, ("wrong mode"));
if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
return 0;
return IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_myaddr);
}
/*
* Decide if a received management frame should be
* printed when debugging is enabled. This filters some
* of the less interesting frames that come frequently
* (e.g. beacons).
*/
static __inline int
doprint(struct ieee80211vap *vap, int subtype)
{
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_BEACON:
return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
return 0;
}
return 1;
}
/*
* Process a received frame. The node associated with the sender
* should be supplied. If nothing was found in the node table then
* the caller is assumed to supply a reference to iv_bss instead.
* The RSSI and a timestamp are also supplied. The RSSI data is used
* during AP scanning to select a AP to associate with; it can have
* any units so long as values have consistent units and higher values
* mean ``better signal''. The receive timestamp is currently not used
* by the 802.11 layer.
*/
static int
sta_input(struct ieee80211_node *ni, struct mbuf *m,
const struct ieee80211_rx_stats *rxs, int rssi, int nf)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ifnet *ifp = vap->iv_ifp;
struct ieee80211_frame *wh;
struct ieee80211_key *key;
struct ether_header *eh;
int hdrspace, need_tap = 1; /* mbuf need to be tapped. */
uint8_t dir, type, subtype, qos;
uint8_t *bssid;
if (m->m_flags & M_AMPDU_MPDU) {
/*
* Fastpath for A-MPDU reorder q resubmission. Frames
* w/ M_AMPDU_MPDU marked have already passed through
* here but were received out of order and been held on
* the reorder queue. When resubmitted they are marked
* with the M_AMPDU_MPDU flag and we can bypass most of
* the normal processing.
*/
wh = mtod(m, struct ieee80211_frame *);
type = IEEE80211_FC0_TYPE_DATA;
dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
subtype = IEEE80211_FC0_SUBTYPE_QOS;
hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
goto resubmit_ampdu;
}
KASSERT(ni != NULL, ("null node"));
ni->ni_inact = ni->ni_inact_reload;
type = -1; /* undefined */
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL,
"too short (1): len %u", m->m_pkthdr.len);
vap->iv_stats.is_rx_tooshort++;
goto out;
}
/*
* Bit of a cheat here, we use a pointer for a 3-address
* frame format but don't reference fields past outside
* ieee80211_frame_min w/o first validating the data is
* present.
*/
wh = mtod(m, struct ieee80211_frame *);
if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
IEEE80211_FC0_VERSION_0) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
wh->i_fc[0], wh->i_fc[1]);
vap->iv_stats.is_rx_badversion++;
goto err;
}
dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
bssid = wh->i_addr2;
if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
/* not interested in */
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
bssid, NULL, "%s", "not to bss");
vap->iv_stats.is_rx_wrongbss++;
goto out;
}
/*
* Some devices may be in a promiscuous mode
* where they receive frames for multiple station
* addresses.
*
* If we receive a data frame that isn't
* destined to our VAP MAC, drop it.
*
* XXX TODO: This is only enforced when not scanning;
* XXX it assumes a software-driven scan will put the NIC
* XXX into a "no data frames" mode before setting this
* XXX flag. Otherwise it may be possible that we'll still
* XXX process data frames whilst scanning.
*/
if ((! IEEE80211_IS_MULTICAST(wh->i_addr1))
&& (! IEEE80211_ADDR_EQ(wh->i_addr1, IF_LLADDR(ifp)))) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D",
IF_LLADDR(ifp), ":", wh->i_addr1, ":");
vap->iv_stats.is_rx_wrongbss++;
goto out;
}
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = nf;
if ( IEEE80211_HAS_SEQ(type, subtype) &&
!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
uint8_t tid = ieee80211_gettid(wh);
if (IEEE80211_QOS_HAS_SEQ(wh) &&
TID_TO_WME_AC(tid) >= WME_AC_VI)
ic->ic_wme.wme_hipri_traffic++;
if (! ieee80211_check_rxseq(ni, wh, bssid))
goto out;
}
}
switch (type) {
case IEEE80211_FC0_TYPE_DATA:
hdrspace = ieee80211_hdrspace(ic, wh);
if (m->m_len < hdrspace &&
(m = m_pullup(m, hdrspace)) == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL,
"data too short: expecting %u", hdrspace);
vap->iv_stats.is_rx_tooshort++;
goto out; /* XXX */
}
/*
* Handle A-MPDU re-ordering. If the frame is to be
* processed directly then ieee80211_ampdu_reorder
* will return 0; otherwise it has consumed the mbuf
* and we should do nothing more with it.
*/
if ((m->m_flags & M_AMPDU) &&
(dir == IEEE80211_FC1_DIR_FROMDS ||
dir == IEEE80211_FC1_DIR_DSTODS) &&
ieee80211_ampdu_reorder(ni, m) != 0) {
m = NULL;
goto out;
}
resubmit_ampdu:
if (dir == IEEE80211_FC1_DIR_FROMDS) {
if ((ifp->if_flags & IFF_SIMPLEX) &&
isfromds_mcastecho(vap, wh)) {
/*
* In IEEE802.11 network, multicast
* packets sent from "me" are broadcast
* from the AP; silently discard for
* SIMPLEX interface.
*/
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "data", "%s", "multicast echo");
vap->iv_stats.is_rx_mcastecho++;
goto out;
}
if ((vap->iv_flags & IEEE80211_F_DWDS) &&
IEEE80211_IS_MULTICAST(wh->i_addr1)) {
/*
* DWDS sta's must drop 3-address mcast frames
* as they will be sent separately as a 4-addr
* frame. Accepting the 3-addr frame will
* confuse the bridge into thinking the sending
* sta is located at the end of WDS link.
*/
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
"3-address data", "%s", "DWDS enabled");
vap->iv_stats.is_rx_mcastecho++;
goto out;
}
} else if (dir == IEEE80211_FC1_DIR_DSTODS) {
if ((vap->iv_flags & IEEE80211_F_DWDS) == 0) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_INPUT, wh, "4-address data",
"%s", "DWDS not enabled");
vap->iv_stats.is_rx_wrongdir++;
goto out;
}
if ((ifp->if_flags & IFF_SIMPLEX) &&
isdstods_mcastecho(vap, wh)) {
/*
* In IEEE802.11 network, multicast
* packets sent from "me" are broadcast
* from the AP; silently discard for
* SIMPLEX interface.
*/
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
"4-address data", "%s", "multicast echo");
vap->iv_stats.is_rx_mcastecho++;
goto out;
}
} else {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, wh,
"data", "incorrect dir 0x%x", dir);
vap->iv_stats.is_rx_wrongdir++;
goto out;
}
/*
* Handle privacy requirements. Note that we
* must not be preempted from here until after
* we (potentially) call ieee80211_crypto_demic;
* otherwise we may violate assumptions in the
* crypto cipher modules used to do delayed update
* of replay sequence numbers.
*/
if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
/*
* Discard encrypted frames when privacy is off.
*/
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "WEP", "%s", "PRIVACY off");
vap->iv_stats.is_rx_noprivacy++;
IEEE80211_NODE_STAT(ni, rx_noprivacy);
goto out;
}
key = ieee80211_crypto_decap(ni, m, hdrspace);
if (key == NULL) {
/* NB: stats+msgs handled in crypto_decap */
IEEE80211_NODE_STAT(ni, rx_wepfail);
goto out;
}
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
} else {
/* XXX M_WEP and IEEE80211_F_PRIVACY */
key = NULL;
}
/*
* Save QoS bits for use below--before we strip the header.
*/
if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
((struct ieee80211_qosframe *)wh)->i_qos[0];
} else
qos = 0;
/*
* Next up, any fragmentation.
*/
if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
m = ieee80211_defrag(ni, m, hdrspace);
if (m == NULL) {
/* Fragment dropped or frame not complete yet */
goto out;
}
}
wh = NULL; /* no longer valid, catch any uses */
/*
* Next strip any MSDU crypto bits.
*/
if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
ni->ni_macaddr, "data", "%s", "demic error");
vap->iv_stats.is_rx_demicfail++;
IEEE80211_NODE_STAT(ni, rx_demicfail);
goto out;
}
/* copy to listener after decrypt */
if (ieee80211_radiotap_active_vap(vap))
ieee80211_radiotap_rx(vap, m);
need_tap = 0;
/*
* Finally, strip the 802.11 header.
*/
m = ieee80211_decap(vap, m, hdrspace);
if (m == NULL) {
/* XXX mask bit to check for both */
/* don't count Null data frames as errors */
if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
goto out;
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
ni->ni_macaddr, "data", "%s", "decap error");
vap->iv_stats.is_rx_decap++;
IEEE80211_NODE_STAT(ni, rx_decap);
goto err;
}
eh = mtod(m, struct ether_header *);
if (!ieee80211_node_is_authorized(ni)) {
/*
* Deny any non-PAE frames received prior to
* authorization. For open/shared-key
* authentication the port is mark authorized
* after authentication completes. For 802.1x
* the port is not marked authorized by the
* authenticator until the handshake has completed.
*/
if (eh->ether_type != htons(ETHERTYPE_PAE)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
eh->ether_shost, "data",
"unauthorized port: ether type 0x%x len %u",
eh->ether_type, m->m_pkthdr.len);
vap->iv_stats.is_rx_unauth++;
IEEE80211_NODE_STAT(ni, rx_unauth);
goto err;
}
} else {
/*
* When denying unencrypted frames, discard
* any non-PAE frames received without encryption.
*/
if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
(key == NULL && (m->m_flags & M_WEP) == 0) &&
eh->ether_type != htons(ETHERTYPE_PAE)) {
/*
* Drop unencrypted frames.
*/
vap->iv_stats.is_rx_unencrypted++;
IEEE80211_NODE_STAT(ni, rx_unencrypted);
goto out;
}
}
/* XXX require HT? */
if (qos & IEEE80211_QOS_AMSDU) {
m = ieee80211_decap_amsdu(ni, m);
if (m == NULL)
return IEEE80211_FC0_TYPE_DATA;
} else {
#ifdef IEEE80211_SUPPORT_SUPERG
m = ieee80211_decap_fastframe(vap, ni, m);
if (m == NULL)
return IEEE80211_FC0_TYPE_DATA;
#endif
}
ieee80211_deliver_data(vap, ni, m);
return IEEE80211_FC0_TYPE_DATA;
case IEEE80211_FC0_TYPE_MGT:
vap->iv_stats.is_rx_mgmt++;
IEEE80211_NODE_STAT(ni, rx_mgmt);
if (dir != IEEE80211_FC1_DIR_NODS) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "data", "incorrect dir 0x%x", dir);
vap->iv_stats.is_rx_wrongdir++;
goto err;
}
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "mgt", "too short: len %u",
m->m_pkthdr.len);
vap->iv_stats.is_rx_tooshort++;
goto out;
}
#ifdef IEEE80211_DEBUG
if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
ieee80211_msg_dumppkts(vap)) {
if_printf(ifp, "received %s from %s rssi %d\n",
ieee80211_mgt_subtype_name(subtype),
ether_sprintf(wh->i_addr2), rssi);
}
#endif
if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
/*
* Only shared key auth frames with a challenge
* should be encrypted, discard all others.
*/
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name(subtype),
"%s", "WEP set but not permitted");
vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
goto out;
}
if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
/*
* Discard encrypted frames when privacy is off.
*/
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "mgt", "%s", "WEP set but PRIVACY off");
vap->iv_stats.is_rx_noprivacy++;
goto out;
}
hdrspace = ieee80211_hdrspace(ic, wh);
key = ieee80211_crypto_decap(ni, m, hdrspace);
if (key == NULL) {
/* NB: stats+msgs handled in crypto_decap */
goto out;
}
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
}
vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
goto out;
case IEEE80211_FC0_TYPE_CTL:
vap->iv_stats.is_rx_ctl++;
IEEE80211_NODE_STAT(ni, rx_ctrl);
vap->iv_recv_ctl(ni, m, subtype);
goto out;
default:
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, NULL, "bad frame type 0x%x", type);
/* should not come here */
break;
}
err:
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
out:
if (m != NULL) {
if (need_tap && ieee80211_radiotap_active_vap(vap))
ieee80211_radiotap_rx(vap, m);
m_freem(m);
}
return type;
}
static void
sta_auth_open(struct ieee80211_node *ni, struct ieee80211_frame *wh,
int rssi, int nf, uint16_t seq, uint16_t status)
{
struct ieee80211vap *vap = ni->ni_vap;
if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "open auth",
"bad sta auth mode %u", ni->ni_authmode);
vap->iv_stats.is_rx_bad_auth++; /* XXX */
return;
}
if (vap->iv_state != IEEE80211_S_AUTH ||
seq != IEEE80211_AUTH_OPEN_RESPONSE) {
vap->iv_stats.is_rx_bad_auth++;
return;
}
if (status != 0) {
IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
ni, "open auth failed (reason %d)", status);
vap->iv_stats.is_rx_auth_fail++;
vap->iv_stats.is_rx_authfail_code = status;
ieee80211_new_state(vap, IEEE80211_S_SCAN,
IEEE80211_SCAN_FAIL_STATUS);
} else
ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
}
static void
sta_auth_shared(struct ieee80211_node *ni, struct ieee80211_frame *wh,
uint8_t *frm, uint8_t *efrm, int rssi, int nf,
uint16_t seq, uint16_t status)
{
struct ieee80211vap *vap = ni->ni_vap;
uint8_t *challenge;
/*
* NB: this can happen as we allow pre-shared key
* authentication to be enabled w/o wep being turned
* on so that configuration of these can be done
* in any order. It may be better to enforce the
* ordering in which case this check would just be
* for sanity/consistency.
*/
if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"%s", " PRIVACY is disabled");
goto bad;
}
/*
* Pre-shared key authentication is evil; accept
* it only if explicitly configured (it is supported
* mainly for compatibility with clients like OS X).
*/
if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
ni->ni_authmode != IEEE80211_AUTH_SHARED) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad sta auth mode %u", ni->ni_authmode);
vap->iv_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
goto bad;
}
challenge = NULL;
if (frm + 1 < efrm) {
if ((frm[1] + 2) > (efrm - frm)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"ie %d/%d too long",
frm[0], (frm[1] + 2) - (efrm - frm));
vap->iv_stats.is_rx_bad_auth++;
goto bad;
}
if (*frm == IEEE80211_ELEMID_CHALLENGE)
challenge = frm;
frm += frm[1] + 2;
}
switch (seq) {
case IEEE80211_AUTH_SHARED_CHALLENGE:
case IEEE80211_AUTH_SHARED_RESPONSE:
if (challenge == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"%s", "no challenge");
vap->iv_stats.is_rx_bad_auth++;
goto bad;
}
if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad challenge len %d", challenge[1]);
vap->iv_stats.is_rx_bad_auth++;
goto bad;
}
default:
break;
}
if (vap->iv_state != IEEE80211_S_AUTH)
return;
switch (seq) {
case IEEE80211_AUTH_SHARED_PASS:
if (ni->ni_challenge != NULL) {
IEEE80211_FREE(ni->ni_challenge, M_80211_NODE);
ni->ni_challenge = NULL;
}
if (status != 0) {
IEEE80211_NOTE_FRAME(vap,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, wh,
"shared key auth failed (reason %d)", status);
vap->iv_stats.is_rx_auth_fail++;
vap->iv_stats.is_rx_authfail_code = status;
return;
}
ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
break;
case IEEE80211_AUTH_SHARED_CHALLENGE:
if (!ieee80211_alloc_challenge(ni))
return;
/* XXX could optimize by passing recvd challenge */
memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
break;
default:
IEEE80211_DISCARD(vap, IEEE80211_MSG_AUTH,
wh, "shared key auth", "bad seq %d", seq);
vap->iv_stats.is_rx_bad_auth++;
return;
}
return;
bad:
/*
* Kick the state machine. This short-circuits
* using the mgt frame timeout to trigger the
* state transition.
*/
if (vap->iv_state == IEEE80211_S_AUTH)
ieee80211_new_state(vap, IEEE80211_S_SCAN,
IEEE80211_SCAN_FAIL_STATUS);
}
int
ieee80211_parse_wmeparams(struct ieee80211vap *vap, uint8_t *frm,
const struct ieee80211_frame *wh)
{
#define MS(_v, _f) (((_v) & _f) >> _f##_S)
struct ieee80211_wme_state *wme = &vap->iv_ic->ic_wme;
u_int len = frm[1], qosinfo;
int i;
if (len < sizeof(struct ieee80211_wme_param)-2) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
wh, "WME", "too short, len %u", len);
return -1;
}
qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
qosinfo &= WME_QOSINFO_COUNT;
/* XXX do proper check for wraparound */
if (qosinfo == wme->wme_wmeChanParams.cap_info)
return 0;
frm += __offsetof(struct ieee80211_wme_param, params_acParams);
for (i = 0; i < WME_NUM_AC; i++) {
struct wmeParams *wmep =
&wme->wme_wmeChanParams.cap_wmeParams[i];
/* NB: ACI not used */
wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
wmep->wmep_txopLimit = le16dec(frm+2);
frm += 4;
}
wme->wme_wmeChanParams.cap_info = qosinfo;
return 1;
#undef MS
}
/*
* Process 11h Channel Switch Announcement (CSA) ie. If this
* is the first CSA then initiate the switch. Otherwise we
* track state and trigger completion and/or cancel of the switch.
* XXX should be public for IBSS use
*/
static void
ieee80211_parse_csaparams(struct ieee80211vap *vap, uint8_t *frm,
const struct ieee80211_frame *wh)
{
struct ieee80211com *ic = vap->iv_ic;
const struct ieee80211_csa_ie *csa =
(const struct ieee80211_csa_ie *) frm;
KASSERT(vap->iv_state >= IEEE80211_S_RUN,
("state %s", ieee80211_state_name[vap->iv_state]));
if (csa->csa_mode > 1) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
wh, "CSA", "invalid mode %u", csa->csa_mode);
return;
}
IEEE80211_LOCK(ic);
if ((ic->ic_flags & IEEE80211_F_CSAPENDING) == 0) {
/*
* Convert the channel number to a channel reference. We
* try first to preserve turbo attribute of the current
* channel then fallback. Note this will not work if the
* CSA specifies a channel that requires a band switch (e.g.
* 11a => 11g). This is intentional as 11h is defined only
* for 5GHz/11a and because the switch does not involve a
* reassociation, protocol state (capabilities, negotated
* rates, etc) may/will be wrong.
*/
struct ieee80211_channel *c =
ieee80211_find_channel_byieee(ic, csa->csa_newchan,
(ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALLTURBO));
if (c == NULL) {
c = ieee80211_find_channel_byieee(ic,
csa->csa_newchan,
(ic->ic_bsschan->ic_flags & IEEE80211_CHAN_ALL));
if (c == NULL) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
wh, "CSA", "invalid channel %u",
csa->csa_newchan);
goto done;
}
}
#if IEEE80211_CSA_COUNT_MIN > 0
if (csa->csa_count < IEEE80211_CSA_COUNT_MIN) {
/*
* Require at least IEEE80211_CSA_COUNT_MIN count to
* reduce the risk of being redirected by a fabricated
* CSA. If a valid CSA is dropped we'll still get a
* beacon miss when the AP leaves the channel so we'll
* eventually follow to the new channel.
*
* NOTE: this violates the 11h spec that states that
* count may be any value and if 0 then a switch
* should happen asap.
*/
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_DOTH,
wh, "CSA", "count %u too small, must be >= %u",
csa->csa_count, IEEE80211_CSA_COUNT_MIN);
goto done;
}
#endif
ieee80211_csa_startswitch(ic, c, csa->csa_mode, csa->csa_count);
} else {
/*
* Validate this ie against the initial CSA. We require
* mode and channel not change and the count must be
* monotonically decreasing. This may be pointless and
* canceling the switch as a result may be too paranoid but
* in the worst case if we drop out of CSA because of this
* and the AP does move then we'll just end up taking a
* beacon miss and scan to find the AP.
*
* XXX may want <= on count as we also process ProbeResp
* frames and those may come in w/ the same count as the
* previous beacon; but doing so leaves us open to a stuck
* count until we add a dead-man timer
*/
if (!(csa->csa_count < ic->ic_csa_count &&
csa->csa_mode == ic->ic_csa_mode &&
csa->csa_newchan == ieee80211_chan2ieee(ic, ic->ic_csa_newchan))) {
IEEE80211_NOTE_FRAME(vap, IEEE80211_MSG_DOTH, wh,
"CSA ie mismatch, initial ie <%d,%d,%d>, "
"this ie <%d,%d,%d>", ic->ic_csa_mode,
ic->ic_csa_newchan, ic->ic_csa_count,
csa->csa_mode, csa->csa_newchan, csa->csa_count);
ieee80211_csa_cancelswitch(ic);
} else {
if (csa->csa_count <= 1)
ieee80211_csa_completeswitch(ic);
else
ic->ic_csa_count = csa->csa_count;
}
}
done:
IEEE80211_UNLOCK(ic);
}
/*
* Return non-zero if a background scan may be continued:
* o bg scan is active
* o no channel switch is pending
* o there has not been any traffic recently
*
* Note we do not check if there is an administrative enable;
* this is only done to start the scan. We assume that any
* change in state will be accompanied by a request to cancel
* active scans which will otherwise cause this test to fail.
*/
static __inline int
contbgscan(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
(ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
vap->iv_state == IEEE80211_S_RUN && /* XXX? */
ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
}
/*
* Return non-zero if a backgrond scan may be started:
* o bg scanning is administratively enabled
* o no channel switch is pending
* o we are not boosted on a dynamic turbo channel
* o there has not been a scan recently
* o there has not been any traffic recently
*/
static __inline int
startbgscan(struct ieee80211vap *vap)
{
struct ieee80211com *ic = vap->iv_ic;
return ((vap->iv_flags & IEEE80211_F_BGSCAN) &&
(ic->ic_flags & IEEE80211_F_CSAPENDING) == 0 &&
#ifdef IEEE80211_SUPPORT_SUPERG
!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
#endif
ieee80211_time_after(ticks, ic->ic_lastscan + vap->iv_bgscanintvl) &&
ieee80211_time_after(ticks, ic->ic_lastdata + vap->iv_bgscanidle));
}
static void
sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
const struct ieee80211_rx_stats *rxs,
int rssi, int nf)
{
#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_channel *rxchan = ic->ic_curchan;
struct ieee80211_frame *wh;
uint8_t *frm, *efrm;
uint8_t *rates, *xrates, *wme, *htcap, *htinfo;
uint8_t rate;
int ht_state_change = 0;
wh = mtod(m0, struct ieee80211_frame *);
frm = (uint8_t *)&wh[1];
efrm = mtod(m0, uint8_t *) + m0->m_len;
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
case IEEE80211_FC0_SUBTYPE_BEACON: {
struct ieee80211_scanparams scan;
struct ieee80211_channel *c;
/*
* We process beacon/probe response frames:
* o when scanning, or
* o station mode when associated (to collect state
* updates such as 802.11g slot time)
* Frames otherwise received are discarded.
*/
if (!((ic->ic_flags & IEEE80211_F_SCAN) || ni->ni_associd)) {
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
/* Override RX channel as appropriate */
if (rxs != NULL) {
c = ieee80211_lookup_channel_rxstatus(vap, rxs);
if (c != NULL)
rxchan = c;
}
/* XXX probe response in sta mode when !scanning? */
if (ieee80211_parse_beacon(ni, m0, rxchan, &scan) != 0) {
if (! (ic->ic_flags & IEEE80211_F_SCAN))
vap->iv_stats.is_beacon_bad++;
return;
}
/*
* Count frame now that we know it's to be processed.
*/
if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
vap->iv_stats.is_rx_beacon++; /* XXX remove */
IEEE80211_NODE_STAT(ni, rx_beacons);
} else
IEEE80211_NODE_STAT(ni, rx_proberesp);
/*
* When operating in station mode, check for state updates.
* Be careful to ignore beacons received while doing a
* background scan. We consider only 11g/WMM stuff right now.
*/
if (ni->ni_associd != 0 &&
((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
/* record tsf of last beacon */
memcpy(ni->ni_tstamp.data, scan.tstamp,
sizeof(ni->ni_tstamp));
/* count beacon frame for s/w bmiss handling */
vap->iv_swbmiss_count++;
vap->iv_bmiss_count = 0;
if (ni->ni_erp != scan.erp) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
wh->i_addr2,
"erp change: was 0x%x, now 0x%x",
ni->ni_erp, scan.erp);
if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
(ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
ic->ic_flags |= IEEE80211_F_USEPROT;
else
ic->ic_flags &= ~IEEE80211_F_USEPROT;
ni->ni_erp = scan.erp;
/* XXX statistic */
/* XXX driver notification */
}
if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
wh->i_addr2,
"capabilities change: was 0x%x, now 0x%x",
ni->ni_capinfo, scan.capinfo);
/*
* NB: we assume short preamble doesn't
* change dynamically
*/
ieee80211_set_shortslottime(ic,
IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
(scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
| (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
/* XXX statistic */
}
if (scan.wme != NULL &&
(ni->ni_flags & IEEE80211_NODE_QOS) &&
ieee80211_parse_wmeparams(vap, scan.wme, wh) > 0)
ieee80211_wme_updateparams(vap);
#ifdef IEEE80211_SUPPORT_SUPERG
if (scan.ath != NULL)
ieee80211_parse_athparams(ni, scan.ath, wh);
#endif
if (scan.htcap != NULL && scan.htinfo != NULL &&
(vap->iv_flags_ht & IEEE80211_FHT_HT)) {
/* XXX state changes? */
if (ieee80211_ht_updateparams(ni,
scan.htcap, scan.htinfo))
ht_state_change = 1;
}
if (scan.quiet)
ic->ic_set_quiet(ni, scan.quiet);
if (scan.tim != NULL) {
struct ieee80211_tim_ie *tim =
(struct ieee80211_tim_ie *) scan.tim;
/*
* XXX Check/debug this code; see if it's about
* the right time to force the VAP awake if we
* receive a frame destined for us?
*/
int aid = IEEE80211_AID(ni->ni_associd);
int ix = aid / NBBY;
int min = tim->tim_bitctl &~ 1;
int max = tim->tim_len + min - 4;
int tim_ucast = 0, tim_mcast = 0;
/*
* Only do this for unicast traffic in the TIM
* The multicast traffic notification for
* the scan notification stuff should occur
* differently.
*/
if (min <= ix && ix <= max &&
isset(tim->tim_bitmap - min, aid)) {
tim_ucast = 1;
}
/*
* Do a separate notification
* for the multicast bit being set.
*/
if (tim->tim_bitctl & 1) {
tim_mcast = 1;
}
/*
* If the TIM indicates there's traffic for
* us then get us out of STA mode powersave.
*/
if (tim_ucast == 1) {
/*
* Wake us out of SLEEP state if we're
* in it; and if we're doing bgscan
* then wake us out of STA powersave.
*/
ieee80211_sta_tim_notify(vap, 1);
/*
* This is preventing us from
* continuing a bgscan; because it
* tricks the contbgscan()
* routine to think there's always
* traffic for us.
*
* I think we need both an RX and
* TX ic_lastdata field.
*/
ic->ic_lastdata = ticks;
}
ni->ni_dtim_count = tim->tim_count;
ni->ni_dtim_period = tim->tim_period;
}
if (scan.csa != NULL &&
(vap->iv_flags & IEEE80211_F_DOTH))
ieee80211_parse_csaparams(vap, scan.csa, wh);
else if (ic->ic_flags & IEEE80211_F_CSAPENDING) {
/*
* No CSA ie or 11h disabled, but a channel
* switch is pending; drop out so we aren't
* stuck in CSA state. If the AP really is
* moving we'll get a beacon miss and scan.
*/
IEEE80211_LOCK(ic);
ieee80211_csa_cancelswitch(ic);
IEEE80211_UNLOCK(ic);
}
/*
* If scanning, pass the info to the scan module.
* Otherwise, check if it's the right time to do
* a background scan. Background scanning must
* be enabled and we must not be operating in the
* turbo phase of dynamic turbo mode. Then,
* it's been a while since the last background
* scan and if no data frames have come through
* recently, kick off a scan. Note that this
* is the mechanism by which a background scan
* is started _and_ continued each time we
* return on-channel to receive a beacon from
* our ap.
*/
if (ic->ic_flags & IEEE80211_F_SCAN) {
ieee80211_add_scan(vap, rxchan,
&scan, wh, subtype, rssi, nf);
} else if (contbgscan(vap)) {
ieee80211_bg_scan(vap, 0);
} else if (startbgscan(vap)) {
vap->iv_stats.is_scan_bg++;
#if 0
/* wakeup if we are sleeing */
ieee80211_set_pwrsave(vap, 0);
#endif
ieee80211_bg_scan(vap, 0);
}
/*
* Put the station to sleep if we haven't seen
* traffic in a while.
*/
IEEE80211_LOCK(ic);
ieee80211_sta_ps_timer_check(vap);
IEEE80211_UNLOCK(ic);
/*
* If we've had a channel width change (eg HT20<->HT40)
* then schedule a delayed driver notification.
*/
if (ht_state_change)
ieee80211_update_chw(ic);
return;
}
/*
* If scanning, just pass information to the scan module.
*/
if (ic->ic_flags & IEEE80211_F_SCAN) {
if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
/*
* Actively scanning a channel marked passive;
* send a probe request now that we know there
* is 802.11 traffic present.
*
* XXX check if the beacon we recv'd gives
* us what we need and suppress the probe req
*/
ieee80211_probe_curchan(vap, 1);
ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
}
ieee80211_add_scan(vap, rxchan, &scan, wh,
subtype, rssi, nf);
return;
}
break;
}
case IEEE80211_FC0_SUBTYPE_AUTH: {
uint16_t algo, seq, status;
/*
* auth frame format
* [2] algorithm
* [2] sequence
* [2] status
* [tlv*] challenge
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
algo = le16toh(*(uint16_t *)frm);
seq = le16toh(*(uint16_t *)(frm + 2));
status = le16toh(*(uint16_t *)(frm + 4));
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr2,
"recv auth frame with algorithm %d seq %d", algo, seq);
if (vap->iv_flags & IEEE80211_F_COUNTERM) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
wh, "auth", "%s", "TKIP countermeasures enabled");
vap->iv_stats.is_rx_auth_countermeasures++;
if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
ieee80211_send_error(ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_AUTH,
IEEE80211_REASON_MIC_FAILURE);
}
return;
}
if (algo == IEEE80211_AUTH_ALG_SHARED)
sta_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
seq, status);
else if (algo == IEEE80211_AUTH_ALG_OPEN)
sta_auth_open(ni, wh, rssi, nf, seq, status);
else {
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, "auth", "unsupported alg %d", algo);
vap->iv_stats.is_rx_auth_unsupported++;
return;
}
break;
}
case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
uint16_t capinfo, associd;
uint16_t status;
if (vap->iv_state != IEEE80211_S_ASSOC) {
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
/*
* asresp frame format
* [2] capability information
* [2] status
* [2] association ID
* [tlv] supported rates
* [tlv] extended supported rates
* [tlv] WME
* [tlv] HT capabilities
* [tlv] HT info
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
ni = vap->iv_bss;
capinfo = le16toh(*(uint16_t *)frm);
frm += 2;
status = le16toh(*(uint16_t *)frm);
frm += 2;
if (status != 0) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
wh->i_addr2, "%sassoc failed (reason %d)",
ISREASSOC(subtype) ? "re" : "", status);
vap->iv_stats.is_rx_auth_fail++; /* XXX */
return;
}
associd = le16toh(*(uint16_t *)frm);
frm += 2;
rates = xrates = wme = htcap = htinfo = NULL;
while (efrm - frm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
switch (*frm) {
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
case IEEE80211_ELEMID_HTCAP:
htcap = frm;
break;
case IEEE80211_ELEMID_HTINFO:
htinfo = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswmeoui(frm))
wme = frm;
else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
/*
* Accept pre-draft HT ie's if the
* standard ones have not been seen.
*/
if (ishtcapoui(frm)) {
if (htcap == NULL)
htcap = frm;
} else if (ishtinfooui(frm)) {
if (htinfo == NULL)
htinfo = frm;
}
}
/* XXX Atheros OUI support */
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
if (xrates != NULL)
IEEE80211_VERIFY_ELEMENT(xrates,
IEEE80211_RATE_MAXSIZE - rates[1], return);
rate = ieee80211_setup_rates(ni, rates, xrates,
IEEE80211_F_JOIN |
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (rate & IEEE80211_RATE_BASIC) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ASSOC,
wh->i_addr2,
"%sassoc failed (rate set mismatch)",
ISREASSOC(subtype) ? "re" : "");
vap->iv_stats.is_rx_assoc_norate++;
ieee80211_new_state(vap, IEEE80211_S_SCAN,
IEEE80211_SCAN_FAIL_STATUS);
return;
}
ni->ni_capinfo = capinfo;
ni->ni_associd = associd;
if (ni->ni_jointime == 0)
ni->ni_jointime = time_uptime;
if (wme != NULL &&
ieee80211_parse_wmeparams(vap, wme, wh) >= 0) {
ni->ni_flags |= IEEE80211_NODE_QOS;
ieee80211_wme_updateparams(vap);
} else
ni->ni_flags &= ~IEEE80211_NODE_QOS;
/*
* Setup HT state according to the negotiation.
*
* NB: shouldn't need to check if HT use is enabled but some
* ap's send back HT ie's even when we don't indicate we
* are HT capable in our AssocReq.
*/
if (htcap != NULL && htinfo != NULL &&
(vap->iv_flags_ht & IEEE80211_FHT_HT)) {
ieee80211_ht_node_init(ni);
ieee80211_ht_updateparams(ni, htcap, htinfo);
ieee80211_setup_htrates(ni, htcap,
IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
ieee80211_setup_basic_htrates(ni, htinfo);
ieee80211_node_setuptxparms(ni);
ieee80211_ratectl_node_init(ni);
}
/*
* Always initialise FF/superg state; we can use this
* for doing A-MSDU encapsulation as well.
*/
#ifdef IEEE80211_SUPPORT_SUPERG
ieee80211_ff_node_init(ni);
#endif
/*
* Configure state now that we are associated.
*
* XXX may need different/additional driver callbacks?
*/
if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
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;
}
ieee80211_set_shortslottime(ic,
IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
/*
* Honor ERP protection.
*
* NB: ni_erp should zero for non-11g operation.
*/
if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
(ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
ic->ic_flags |= IEEE80211_F_USEPROT;
else
ic->ic_flags &= ~IEEE80211_F_USEPROT;
IEEE80211_NOTE_MAC(vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_DEBUG, wh->i_addr2,
"%sassoc success at aid %d: %s preamble, %s slot time%s%s%s%s%s%s%s%s",
ISREASSOC(subtype) ? "re" : "",
IEEE80211_NODE_AID(ni),
ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
ni->ni_flags & IEEE80211_NODE_HT ?
(ni->ni_chw == 40 ? ", HT40" : ", HT20") : "",
ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
ni->ni_flags & IEEE80211_NODE_MIMO_RTS ? " (+SMPS-DYN)" :
ni->ni_flags & IEEE80211_NODE_MIMO_PS ? " (+SMPS)" : "",
ni->ni_flags & IEEE80211_NODE_RIFS ? " (+RIFS)" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) ?
", fast-frames" : "",
IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_TURBOP) ?
", turbo" : ""
);
ieee80211_new_state(vap, IEEE80211_S_RUN, subtype);
break;
}
case IEEE80211_FC0_SUBTYPE_DEAUTH: {
uint16_t reason;
if (vap->iv_state == IEEE80211_S_SCAN) {
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
/* NB: can happen when in promiscuous mode */
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
/*
* deauth frame format
* [2] reason
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
reason = le16toh(*(uint16_t *)frm);
vap->iv_stats.is_rx_deauth++;
vap->iv_stats.is_rx_deauth_code = reason;
IEEE80211_NODE_STAT(ni, rx_deauth);
IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
"recv deauthenticate (reason: %d (%s))", reason,
ieee80211_reason_to_string(reason));
ieee80211_new_state(vap, IEEE80211_S_AUTH,
(reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
break;
}
case IEEE80211_FC0_SUBTYPE_DISASSOC: {
uint16_t reason;
if (vap->iv_state != IEEE80211_S_RUN &&
vap->iv_state != IEEE80211_S_ASSOC &&
vap->iv_state != IEEE80211_S_AUTH) {
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
/* NB: can happen when in promiscuous mode */
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
/*
* disassoc frame format
* [2] reason
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
reason = le16toh(*(uint16_t *)frm);
vap->iv_stats.is_rx_disassoc++;
vap->iv_stats.is_rx_disassoc_code = reason;
IEEE80211_NODE_STAT(ni, rx_disassoc);
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
"recv disassociate (reason: %d (%s))", reason,
ieee80211_reason_to_string(reason));
ieee80211_new_state(vap, IEEE80211_S_ASSOC, 0);
break;
}
case IEEE80211_FC0_SUBTYPE_ACTION:
case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL, "%s", "not for us");
vap->iv_stats.is_rx_mgtdiscard++;
} else if (vap->iv_state != IEEE80211_S_RUN) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL, "wrong state %s",
ieee80211_state_name[vap->iv_state]);
vap->iv_stats.is_rx_mgtdiscard++;
} else {
if (ieee80211_parse_action(ni, m0) == 0)
(void)ic->ic_recv_action(ni, wh, frm, efrm);
}
break;
case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
case IEEE80211_FC0_SUBTYPE_ATIM:
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL, "%s", "not handled");
vap->iv_stats.is_rx_mgtdiscard++;
break;
default:
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, "mgt", "subtype 0x%x not handled", subtype);
vap->iv_stats.is_rx_badsubtype++;
break;
}
#undef ISREASSOC
}
static void
sta_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
{
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_BAR:
ieee80211_recv_bar(ni, m);
break;
}
}
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