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freebsd-skq/sys/net80211/ieee80211_hostap.c
rpaulo 9eaa28fa36 Add a comment explaining the previous commit. 
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M    ieee80211_hostap.c
2010-03-28 12:55:31 +00:00

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66 KiB
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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 HOSTAP 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/ethernet.h>
#include <net/bpf.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_hostap.h>
#include <net80211/ieee80211_input.h>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/ieee80211_superg.h>
#endif
#include <net80211/ieee80211_wds.h>
#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
static void hostap_vattach(struct ieee80211vap *);
static int hostap_newstate(struct ieee80211vap *, enum ieee80211_state, int);
static int hostap_input(struct ieee80211_node *ni, struct mbuf *m,
int rssi, int nf);
static void hostap_deliver_data(struct ieee80211vap *,
struct ieee80211_node *, struct mbuf *);
static void hostap_recv_mgmt(struct ieee80211_node *, struct mbuf *,
int subtype, int rssi, int nf);
static void hostap_recv_ctl(struct ieee80211_node *, struct mbuf *, int);
static void hostap_recv_pspoll(struct ieee80211_node *, struct mbuf *);
void
ieee80211_hostap_attach(struct ieee80211com *ic)
{
ic->ic_vattach[IEEE80211_M_HOSTAP] = hostap_vattach;
}
void
ieee80211_hostap_detach(struct ieee80211com *ic)
{
}
static void
hostap_vdetach(struct ieee80211vap *vap)
{
}
static void
hostap_vattach(struct ieee80211vap *vap)
{
vap->iv_newstate = hostap_newstate;
vap->iv_input = hostap_input;
vap->iv_recv_mgmt = hostap_recv_mgmt;
vap->iv_recv_ctl = hostap_recv_ctl;
vap->iv_opdetach = hostap_vdetach;
vap->iv_deliver_data = hostap_deliver_data;
}
static void
sta_disassoc(void *arg, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = arg;
if (ni->ni_vap == vap && ni->ni_associd != 0) {
IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_ASSOC_LEAVE);
ieee80211_node_leave(ni);
}
}
static void
sta_csa(void *arg, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = arg;
if (ni->ni_vap == vap && ni->ni_associd != 0)
if (ni->ni_inact > vap->iv_inact_init) {
ni->ni_inact = vap->iv_inact_init;
IEEE80211_NOTE(vap, IEEE80211_MSG_INACT, ni,
"%s: inact %u", __func__, ni->ni_inact);
}
}
static void
sta_drop(void *arg, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = arg;
if (ni->ni_vap == vap && ni->ni_associd != 0)
ieee80211_node_leave(ni);
}
/*
* Does a channel change require associated stations to re-associate
* so protocol state is correct. This is used when doing CSA across
* bands or similar (e.g. HT -> legacy).
*/
static int
isbandchange(struct ieee80211com *ic)
{
return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
}
/*
* IEEE80211_M_HOSTAP vap state machine handler.
*/
static int
hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
struct ieee80211com *ic = vap->iv_ic;
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 */
if (ostate != IEEE80211_S_SCAN)
ieee80211_cancel_scan(vap); /* background scan */
switch (nstate) {
case IEEE80211_S_INIT:
switch (ostate) {
case IEEE80211_S_SCAN:
ieee80211_cancel_scan(vap);
break;
case IEEE80211_S_CAC:
ieee80211_dfs_cac_stop(vap);
break;
case IEEE80211_S_RUN:
ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, 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_CSA:
case IEEE80211_S_RUN:
ieee80211_iterate_nodes(&ic->ic_sta, sta_disassoc, vap);
/*
* Clear overlapping BSS state; the beacon frame
* will be reconstructed on transition to the RUN
* state and the timeout routines check if the flag
* is set before doing anything so this is sufficient.
*/
ic->ic_flags_ext &= ~IEEE80211_FEXT_NONERP_PR;
ic->ic_flags_ht &= ~IEEE80211_FHT_NONHT_PR;
/* fall thru... */
case IEEE80211_S_CAC:
/*
* NB: We may get here because of a manual channel
* change in which case we need to stop CAC
* XXX no need to stop if ostate RUN but it's ok
*/
ieee80211_dfs_cac_stop(vap);
/* fall thru... */
case IEEE80211_S_INIT:
if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
!IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
/*
* Already have a channel; bypass the
* scan and startup immediately.
* ieee80211_create_ibss will call back to
* move us to RUN state.
*/
ieee80211_create_ibss(vap, vap->iv_des_chan);
break;
}
/*
* 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:
/*
* A state change requires a reset; scan.
*/
ieee80211_check_scan_current(vap);
break;
default:
break;
}
break;
case IEEE80211_S_CAC:
/*
* Start CAC on a DFS channel. We come here when starting
* a bss on a DFS channel (see ieee80211_create_ibss).
*/
ieee80211_dfs_cac_start(vap);
break;
case IEEE80211_S_RUN:
if (vap->iv_flags & IEEE80211_F_WPA) {
/* XXX validate prerequisites */
}
switch (ostate) {
case IEEE80211_S_INIT:
/*
* Already have a channel; bypass the
* scan and startup immediately.
* Note that ieee80211_create_ibss will call
* back to do a RUN->RUN state change.
*/
ieee80211_create_ibss(vap,
ieee80211_ht_adjust_channel(ic,
ic->ic_curchan, vap->iv_flags_ht));
/* NB: iv_bss is changed on return */
break;
case IEEE80211_S_CAC:
/*
* NB: This is the normal state change when CAC
* expires and no radar was detected; no need to
* clear the CAC timer as it's already expired.
*/
/* fall thru... */
case IEEE80211_S_CSA:
/*
* Shorten inactivity timer of associated stations
* to weed out sta's that don't follow a CSA.
*/
ieee80211_iterate_nodes(&ic->ic_sta, sta_csa, vap);
/*
* Update bss node channel to reflect where
* we landed after CSA.
*/
ieee80211_node_set_chan(vap->iv_bss,
ieee80211_ht_adjust_channel(ic, ic->ic_curchan,
ieee80211_htchanflags(vap->iv_bss->ni_chan)));
/* XXX bypass debug msgs */
break;
case IEEE80211_S_SCAN:
case IEEE80211_S_RUN:
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_debug(vap)) {
struct ieee80211_node *ni = vap->iv_bss;
ieee80211_note(vap,
"synchronized with %s ssid ",
ether_sprintf(ni->ni_bssid));
ieee80211_print_essid(ni->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
break;
default:
break;
}
/*
* Start/stop the authenticator. We delay until here
* to allow configuration to happen out of order.
*/
if (vap->iv_auth->ia_attach != NULL) {
/* XXX check failure */
vap->iv_auth->ia_attach(vap);
} else if (vap->iv_auth->ia_detach != NULL) {
vap->iv_auth->ia_detach(vap);
}
ieee80211_node_authorize(vap->iv_bss);
break;
case IEEE80211_S_CSA:
if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
/*
* On a ``band change'' silently drop associated
* stations as they must re-associate before they
* can pass traffic (as otherwise protocol state
* such as capabilities and the negotiated rate
* set may/will be wrong).
*/
ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
}
break;
default:
break;
}
return 0;
}
static void
hostap_deliver_data(struct ieee80211vap *vap,
struct ieee80211_node *ni, struct mbuf *m)
{
struct ether_header *eh = mtod(m, struct ether_header *);
struct ifnet *ifp = vap->iv_ifp;
/* clear driver/net80211 flags before passing up */
m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
KASSERT(vap->iv_opmode == IEEE80211_M_HOSTAP,
("gack, opmode %d", vap->iv_opmode));
/*
* Do accounting.
*/
ifp->if_ipackets++;
IEEE80211_NODE_STAT(ni, rx_data);
IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
m->m_flags |= M_MCAST; /* XXX M_BCAST? */
IEEE80211_NODE_STAT(ni, rx_mcast);
} else
IEEE80211_NODE_STAT(ni, rx_ucast);
/* perform as a bridge within the AP */
if ((vap->iv_flags & IEEE80211_F_NOBRIDGE) == 0) {
struct mbuf *mcopy = NULL;
if (m->m_flags & M_MCAST) {
mcopy = m_dup(m, M_DONTWAIT);
if (mcopy == NULL)
ifp->if_oerrors++;
else
mcopy->m_flags |= M_MCAST;
} else {
/*
* Check if the destination is associated with the
* same vap and authorized to receive traffic.
* Beware of traffic destined for the vap itself;
* sending it will not work; just let it be delivered
* normally.
*/
struct ieee80211_node *sta = ieee80211_find_vap_node(
&vap->iv_ic->ic_sta, vap, eh->ether_dhost);
if (sta != NULL) {
if (ieee80211_node_is_authorized(sta)) {
/*
* Beware of sending to ourself; this
* needs to happen via the normal
* input path.
*/
if (sta != vap->iv_bss) {
mcopy = m;
m = NULL;
}
} else {
vap->iv_stats.is_rx_unauth++;
IEEE80211_NODE_STAT(sta, rx_unauth);
}
ieee80211_free_node(sta);
}
}
if (mcopy != NULL) {
int len, err;
len = mcopy->m_pkthdr.len;
err = ifp->if_transmit(ifp, mcopy);
if (err) {
/* NB: IFQ_HANDOFF reclaims mcopy */
} else {
ifp->if_opackets++;
}
}
}
if (m != NULL) {
/*
* Mark frame as coming from vap's interface.
*/
m->m_pkthdr.rcvif = ifp;
if (m->m_flags & M_MCAST) {
/*
* Spam DWDS vap's w/ multicast traffic.
*/
/* XXX only if dwds in use? */
ieee80211_dwds_mcast(vap, m);
}
if (ni->ni_vlan != 0) {
/* attach vlan tag */
m->m_pkthdr.ether_vtag = ni->ni_vlan;
m->m_flags |= M_VLANTAG;
}
ifp->if_input(ifp, m);
}
}
/*
* 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
hostap_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
{
#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
#define HAS_SEQ(type) ((type & 0x4) == 0)
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;
uint16_t rxseq;
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) {
if (dir != IEEE80211_FC1_DIR_NODS)
bssid = wh->i_addr1;
else if (type == IEEE80211_FC0_TYPE_CTL)
bssid = wh->i_addr1;
else {
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_ANY, ni->ni_macaddr,
NULL, "too short (2): len %u",
m->m_pkthdr.len);
vap->iv_stats.is_rx_tooshort++;
goto out;
}
bssid = wh->i_addr3;
}
/*
* Validate the bssid.
*/
if (!(type == IEEE80211_FC0_TYPE_MGT &&
subtype == IEEE80211_FC0_SUBTYPE_BEACON) &&
!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
!IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
/* not interested in */
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
bssid, NULL, "%s", "not to bss");
vap->iv_stats.is_rx_wrongbss++;
goto out;
}
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = nf;
if (HAS_SEQ(type)) {
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++;
rxseq = le16toh(*(uint16_t *)wh->i_seq);
if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
(wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
/* duplicate, discard */
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
bssid, "duplicate",
"seqno <%u,%u> fragno <%u,%u> tid %u",
rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
ni->ni_rxseqs[tid] >>
IEEE80211_SEQ_SEQ_SHIFT,
rxseq & IEEE80211_SEQ_FRAG_MASK,
ni->ni_rxseqs[tid] &
IEEE80211_SEQ_FRAG_MASK,
tid);
vap->iv_stats.is_rx_dup++;
IEEE80211_NODE_STAT(ni, rx_dup);
goto out;
}
ni->ni_rxseqs[tid] = rxseq;
}
}
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 */
}
if (!(dir == IEEE80211_FC1_DIR_TODS ||
(dir == IEEE80211_FC1_DIR_DSTODS &&
(vap->iv_flags & IEEE80211_F_DWDS)))) {
if (dir != IEEE80211_FC1_DIR_DSTODS) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_INPUT, wh, "data",
"incorrect dir 0x%x", dir);
} else {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_INPUT |
IEEE80211_MSG_WDS, wh,
"4-address data",
"%s", "DWDS not enabled");
}
vap->iv_stats.is_rx_wrongdir++;
goto out;
}
/* check if source STA is associated */
if (ni == vap->iv_bss) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "data", "%s", "unknown src");
ieee80211_send_error(ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_NOT_AUTHED);
vap->iv_stats.is_rx_notassoc++;
goto err;
}
if (ni->ni_associd == 0) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "data", "%s", "unassoc src");
IEEE80211_SEND_MGMT(ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_NOT_ASSOCED);
vap->iv_stats.is_rx_notassoc++;
goto err;
}
/*
* Check for power save state change.
* XXX out-of-order A-MPDU frames?
*/
if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
(ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
ieee80211_node_pwrsave(ni,
wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
/*
* For 4-address packets handle WDS discovery
* notifications. Once a WDS link is setup frames
* are just delivered to the WDS vap (see below).
*/
if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap == NULL) {
if (!ieee80211_node_is_authorized(ni)) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_INPUT |
IEEE80211_MSG_WDS, wh,
"4-address data",
"%s", "unauthorized port");
vap->iv_stats.is_rx_unauth++;
IEEE80211_NODE_STAT(ni, rx_unauth);
goto err;
}
ieee80211_dwds_discover(ni, m);
return type;
}
/*
* 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) &&
ieee80211_ampdu_reorder(ni, m) != 0) {
m = NULL;
goto out;
}
resubmit_ampdu:
/*
* 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_WEP) {
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_WEP;
} 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
}
if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
else
hostap_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, "mgt", "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;
}
if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
/* ensure return frames are unicast */
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, NULL, "source is multicast: %s",
ether_sprintf(wh->i_addr2));
vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
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 >>
IEEE80211_FC0_SUBTYPE_SHIFT],
ether_sprintf(wh->i_addr2), rssi);
}
#endif
if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
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, NULL,
"%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, NULL, "%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_WEP;
}
/*
* Pass the packet to radiotap before calling iv_recv_mgmt().
* Otherwise iv_recv_mgmt() might pass another packet to
* radiotap, resulting in out of order packet captures.
*/
if (ieee80211_radiotap_active_vap(vap))
ieee80211_radiotap_rx(vap, m);
need_tap = 0;
vap->iv_recv_mgmt(ni, m, subtype, 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, "bad", "frame type 0x%x", type);
/* should not come here */
break;
}
err:
ifp->if_ierrors++;
out:
if (m != NULL) {
if (need_tap && ieee80211_radiotap_active_vap(vap))
ieee80211_radiotap_rx(vap, m);
m_freem(m);
}
return type;
#undef SEQ_LEQ
}
static void
hostap_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;
KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
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 */
/*
* Clear any challenge text that may be there if
* a previous shared key auth failed and then an
* open auth is attempted.
*/
if (ni->ni_challenge != NULL) {
free(ni->ni_challenge, M_80211_NODE);
ni->ni_challenge = NULL;
}
/* XXX hack to workaround calling convention */
ieee80211_send_error(ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq + 1) | (IEEE80211_STATUS_ALG<<16));
return;
}
if (seq != IEEE80211_AUTH_OPEN_REQUEST) {
vap->iv_stats.is_rx_bad_auth++;
return;
}
/* always accept open authentication requests */
if (ni == vap->iv_bss) {
ni = ieee80211_dup_bss(vap, wh->i_addr2);
if (ni == NULL)
return;
} else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
(void) ieee80211_ref_node(ni);
/*
* Mark the node as referenced to reflect that it's
* reference count has been bumped to insure it remains
* after the transaction completes.
*/
ni->ni_flags |= IEEE80211_NODE_AREF;
/*
* Mark the node as requiring a valid association id
* before outbound traffic is permitted.
*/
ni->ni_flags |= IEEE80211_NODE_ASSOCID;
if (vap->iv_acl != NULL &&
vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
/*
* When the ACL policy is set to RADIUS we defer the
* authorization to a user agent. Dispatch an event,
* a subsequent MLME call will decide the fate of the
* station. If the user agent is not present then the
* node will be reclaimed due to inactivity.
*/
IEEE80211_NOTE_MAC(vap,
IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL, ni->ni_macaddr,
"%s", "station authentication defered (radius acl)");
ieee80211_notify_node_auth(ni);
} else {
IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
IEEE80211_NOTE_MAC(vap,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni->ni_macaddr,
"%s", "station authenticated (open)");
/*
* 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);
}
}
static void
hostap_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;
int allocbs, estatus;
KASSERT(vap->iv_state == IEEE80211_S_RUN, ("state %d", vap->iv_state));
/*
* 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");
estatus = IEEE80211_STATUS_ALG;
goto bad;
}
/*
* Pre-shared key authentication is evil; accept
* it only if explicitly configured (it is supported
* mainly for compatibility with clients like Mac 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? */
estatus = IEEE80211_STATUS_ALG;
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++;
estatus = IEEE80211_STATUS_CHALLENGE;
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++;
estatus = IEEE80211_STATUS_CHALLENGE;
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++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
default:
break;
}
switch (seq) {
case IEEE80211_AUTH_SHARED_REQUEST:
if (ni == vap->iv_bss) {
ni = ieee80211_dup_bss(vap, wh->i_addr2);
if (ni == NULL) {
/* NB: no way to return an error */
return;
}
allocbs = 1;
} else {
if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
(void) ieee80211_ref_node(ni);
allocbs = 0;
}
/*
* Mark the node as referenced to reflect that it's
* reference count has been bumped to insure it remains
* after the transaction completes.
*/
ni->ni_flags |= IEEE80211_NODE_AREF;
/*
* Mark the node as requiring a valid associatio id
* before outbound traffic is permitted.
*/
ni->ni_flags |= IEEE80211_NODE_ASSOCID;
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = nf;
if (!ieee80211_alloc_challenge(ni)) {
/* NB: don't return error so they rexmit */
return;
}
get_random_bytes(ni->ni_challenge,
IEEE80211_CHALLENGE_LEN);
IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
ni, "shared key %sauth request", allocbs ? "" : "re");
/*
* When the ACL policy is set to RADIUS we defer the
* authorization to a user agent. Dispatch an event,
* a subsequent MLME call will decide the fate of the
* station. If the user agent is not present then the
* node will be reclaimed due to inactivity.
*/
if (vap->iv_acl != NULL &&
vap->iv_acl->iac_getpolicy(vap) == IEEE80211_MACCMD_POLICY_RADIUS) {
IEEE80211_NOTE_MAC(vap,
IEEE80211_MSG_AUTH | IEEE80211_MSG_ACL,
ni->ni_macaddr,
"%s", "station authentication defered (radius acl)");
ieee80211_notify_node_auth(ni);
return;
}
break;
case IEEE80211_AUTH_SHARED_RESPONSE:
if (ni == vap->iv_bss) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key response",
"%s", "unknown station");
/* NB: don't send a response */
return;
}
if (ni->ni_challenge == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key response",
"%s", "no challenge recorded");
vap->iv_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
if (memcmp(ni->ni_challenge, &challenge[2],
challenge[1]) != 0) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key response",
"%s", "challenge mismatch");
vap->iv_stats.is_rx_auth_fail++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
ni, "%s", "station authenticated (shared key)");
ieee80211_node_authorize(ni);
break;
default:
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad seq %d", seq);
vap->iv_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_SEQUENCE;
goto bad;
}
IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
return;
bad:
/*
* Send an error response; but only when operating as an AP.
*/
/* XXX hack to workaround calling convention */
ieee80211_send_error(ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq + 1) | (estatus<<16));
}
/*
* Convert a WPA cipher selector OUI to an internal
* cipher algorithm. Where appropriate we also
* record any key length.
*/
static int
wpa_cipher(const uint8_t *sel, uint8_t *keylen)
{
#define WPA_SEL(x) (((x)<<24)|WPA_OUI)
uint32_t w = LE_READ_4(sel);
switch (w) {
case WPA_SEL(WPA_CSE_NULL):
return IEEE80211_CIPHER_NONE;
case WPA_SEL(WPA_CSE_WEP40):
if (keylen)
*keylen = 40 / NBBY;
return IEEE80211_CIPHER_WEP;
case WPA_SEL(WPA_CSE_WEP104):
if (keylen)
*keylen = 104 / NBBY;
return IEEE80211_CIPHER_WEP;
case WPA_SEL(WPA_CSE_TKIP):
return IEEE80211_CIPHER_TKIP;
case WPA_SEL(WPA_CSE_CCMP):
return IEEE80211_CIPHER_AES_CCM;
}
return 32; /* NB: so 1<< is discarded */
#undef WPA_SEL
}
/*
* Convert a WPA key management/authentication algorithm
* to an internal code.
*/
static int
wpa_keymgmt(const uint8_t *sel)
{
#define WPA_SEL(x) (((x)<<24)|WPA_OUI)
uint32_t w = LE_READ_4(sel);
switch (w) {
case WPA_SEL(WPA_ASE_8021X_UNSPEC):
return WPA_ASE_8021X_UNSPEC;
case WPA_SEL(WPA_ASE_8021X_PSK):
return WPA_ASE_8021X_PSK;
case WPA_SEL(WPA_ASE_NONE):
return WPA_ASE_NONE;
}
return 0; /* NB: so is discarded */
#undef WPA_SEL
}
/*
* Parse a WPA information element to collect parameters.
* Note that we do not validate security parameters; that
* is handled by the authenticator; the parsing done here
* is just for internal use in making operational decisions.
*/
static int
ieee80211_parse_wpa(struct ieee80211vap *vap, const uint8_t *frm,
struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
{
uint8_t len = frm[1];
uint32_t w;
int n;
/*
* Check the length once for fixed parts: OUI, type,
* version, mcast cipher, and 2 selector counts.
* Other, variable-length data, must be checked separately.
*/
if ((vap->iv_flags & IEEE80211_F_WPA1) == 0) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "not WPA, flags 0x%x", vap->iv_flags);
return IEEE80211_REASON_IE_INVALID;
}
if (len < 14) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "too short, len %u", len);
return IEEE80211_REASON_IE_INVALID;
}
frm += 6, len -= 4; /* NB: len is payload only */
/* NB: iswpaoui already validated the OUI and type */
w = LE_READ_2(frm);
if (w != WPA_VERSION) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "bad version %u", w);
return IEEE80211_REASON_IE_INVALID;
}
frm += 2, len -= 2;
memset(rsn, 0, sizeof(*rsn));
/* multicast/group cipher */
rsn->rsn_mcastcipher = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
frm += 4, len -= 4;
/* unicast ciphers */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4+2) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "ucast cipher data too short; len %u, n %u",
len, n);
return IEEE80211_REASON_IE_INVALID;
}
w = 0;
for (; n > 0; n--) {
w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
frm += 4, len -= 4;
}
if (w & (1<<IEEE80211_CIPHER_TKIP))
rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
else
rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
/* key management algorithms */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "key mgmt alg data too short; len %u, n %u",
len, n);
return IEEE80211_REASON_IE_INVALID;
}
w = 0;
for (; n > 0; n--) {
w |= wpa_keymgmt(frm);
frm += 4, len -= 4;
}
if (w & WPA_ASE_8021X_UNSPEC)
rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
else
rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
if (len > 2) /* optional capabilities */
rsn->rsn_caps = LE_READ_2(frm);
return 0;
}
/*
* Convert an RSN cipher selector OUI to an internal
* cipher algorithm. Where appropriate we also
* record any key length.
*/
static int
rsn_cipher(const uint8_t *sel, uint8_t *keylen)
{
#define RSN_SEL(x) (((x)<<24)|RSN_OUI)
uint32_t w = LE_READ_4(sel);
switch (w) {
case RSN_SEL(RSN_CSE_NULL):
return IEEE80211_CIPHER_NONE;
case RSN_SEL(RSN_CSE_WEP40):
if (keylen)
*keylen = 40 / NBBY;
return IEEE80211_CIPHER_WEP;
case RSN_SEL(RSN_CSE_WEP104):
if (keylen)
*keylen = 104 / NBBY;
return IEEE80211_CIPHER_WEP;
case RSN_SEL(RSN_CSE_TKIP):
return IEEE80211_CIPHER_TKIP;
case RSN_SEL(RSN_CSE_CCMP):
return IEEE80211_CIPHER_AES_CCM;
case RSN_SEL(RSN_CSE_WRAP):
return IEEE80211_CIPHER_AES_OCB;
}
return 32; /* NB: so 1<< is discarded */
#undef WPA_SEL
}
/*
* Convert an RSN key management/authentication algorithm
* to an internal code.
*/
static int
rsn_keymgmt(const uint8_t *sel)
{
#define RSN_SEL(x) (((x)<<24)|RSN_OUI)
uint32_t w = LE_READ_4(sel);
switch (w) {
case RSN_SEL(RSN_ASE_8021X_UNSPEC):
return RSN_ASE_8021X_UNSPEC;
case RSN_SEL(RSN_ASE_8021X_PSK):
return RSN_ASE_8021X_PSK;
case RSN_SEL(RSN_ASE_NONE):
return RSN_ASE_NONE;
}
return 0; /* NB: so is discarded */
#undef RSN_SEL
}
/*
* Parse a WPA/RSN information element to collect parameters
* and validate the parameters against what has been
* configured for the system.
*/
static int
ieee80211_parse_rsn(struct ieee80211vap *vap, const uint8_t *frm,
struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
{
uint8_t len = frm[1];
uint32_t w;
int n;
/*
* Check the length once for fixed parts:
* version, mcast cipher, and 2 selector counts.
* Other, variable-length data, must be checked separately.
*/
if ((vap->iv_flags & IEEE80211_F_WPA2) == 0) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "not RSN, flags 0x%x", vap->iv_flags);
return IEEE80211_REASON_IE_INVALID;
}
if (len < 10) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "too short, len %u", len);
return IEEE80211_REASON_IE_INVALID;
}
frm += 2;
w = LE_READ_2(frm);
if (w != RSN_VERSION) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "bad version %u", w);
return IEEE80211_REASON_IE_INVALID;
}
frm += 2, len -= 2;
memset(rsn, 0, sizeof(*rsn));
/* multicast/group cipher */
rsn->rsn_mcastcipher = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
frm += 4, len -= 4;
/* unicast ciphers */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4+2) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "ucast cipher data too short; len %u, n %u",
len, n);
return IEEE80211_REASON_IE_INVALID;
}
w = 0;
for (; n > 0; n--) {
w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
frm += 4, len -= 4;
}
if (w & (1<<IEEE80211_CIPHER_TKIP))
rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
else
rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
/* key management algorithms */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "key mgmt alg data too short; len %u, n %u",
len, n);
return IEEE80211_REASON_IE_INVALID;
}
w = 0;
for (; n > 0; n--) {
w |= rsn_keymgmt(frm);
frm += 4, len -= 4;
}
if (w & RSN_ASE_8021X_UNSPEC)
rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
else
rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
/* optional RSN capabilities */
if (len > 2)
rsn->rsn_caps = LE_READ_2(frm);
/* XXXPMKID */
return 0;
}
/*
* WPA/802.11i assocation request processing.
*/
static int
wpa_assocreq(struct ieee80211_node *ni, struct ieee80211_rsnparms *rsnparms,
const struct ieee80211_frame *wh, const uint8_t *wpa,
const uint8_t *rsn, uint16_t capinfo)
{
struct ieee80211vap *vap = ni->ni_vap;
uint8_t reason;
int badwparsn;
ni->ni_flags &= ~(IEEE80211_NODE_WPS|IEEE80211_NODE_TSN);
if (wpa == NULL && rsn == NULL) {
if (vap->iv_flags_ext & IEEE80211_FEXT_WPS) {
/*
* W-Fi Protected Setup (WPS) permits
* clients to associate and pass EAPOL frames
* to establish initial credentials.
*/
ni->ni_flags |= IEEE80211_NODE_WPS;
return 1;
}
if ((vap->iv_flags_ext & IEEE80211_FEXT_TSN) &&
(capinfo & IEEE80211_CAPINFO_PRIVACY)) {
/*
* Transitional Security Network. Permits clients
* to associate and use WEP while WPA is configured.
*/
ni->ni_flags |= IEEE80211_NODE_TSN;
return 1;
}
IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
wh, NULL, "%s", "no WPA/RSN IE in association request");
vap->iv_stats.is_rx_assoc_badwpaie++;
reason = IEEE80211_REASON_IE_INVALID;
goto bad;
}
/* assert right association security credentials */
badwparsn = 0; /* NB: to silence compiler */
switch (vap->iv_flags & IEEE80211_F_WPA) {
case IEEE80211_F_WPA1:
badwparsn = (wpa == NULL);
break;
case IEEE80211_F_WPA2:
badwparsn = (rsn == NULL);
break;
case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
badwparsn = (wpa == NULL && rsn == NULL);
break;
}
if (badwparsn) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
wh, NULL,
"%s", "missing WPA/RSN IE in association request");
vap->iv_stats.is_rx_assoc_badwpaie++;
reason = IEEE80211_REASON_IE_INVALID;
goto bad;
}
/*
* Parse WPA/RSN information element.
*/
if (wpa != NULL)
reason = ieee80211_parse_wpa(vap, wpa, rsnparms, wh);
else
reason = ieee80211_parse_rsn(vap, rsn, rsnparms, wh);
if (reason != 0) {
/* XXX distinguish WPA/RSN? */
vap->iv_stats.is_rx_assoc_badwpaie++;
goto bad;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, ni,
"%s ie: mc %u/%u uc %u/%u key %u caps 0x%x",
wpa != NULL ? "WPA" : "RSN",
rsnparms->rsn_mcastcipher, rsnparms->rsn_mcastkeylen,
rsnparms->rsn_ucastcipher, rsnparms->rsn_ucastkeylen,
rsnparms->rsn_keymgmt, rsnparms->rsn_caps);
return 1;
bad:
ieee80211_node_deauth(ni, reason);
return 0;
}
/* XXX find a better place for definition */
struct l2_update_frame {
struct ether_header eh;
uint8_t dsap;
uint8_t ssap;
uint8_t control;
uint8_t xid[3];
} __packed;
/*
* Deliver a TGf L2UF frame on behalf of a station.
* This primes any bridge when the station is roaming
* between ap's on the same wired network.
*/
static void
ieee80211_deliver_l2uf(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ifnet *ifp = vap->iv_ifp;
struct mbuf *m;
struct l2_update_frame *l2uf;
struct ether_header *eh;
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
"%s", "no mbuf for l2uf frame");
vap->iv_stats.is_rx_nobuf++; /* XXX not right */
return;
}
l2uf = mtod(m, struct l2_update_frame *);
eh = &l2uf->eh;
/* dst: Broadcast address */
IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
/* src: associated STA */
IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
l2uf->dsap = 0;
l2uf->ssap = 0;
l2uf->control = 0xf5;
l2uf->xid[0] = 0x81;
l2uf->xid[1] = 0x80;
l2uf->xid[2] = 0x00;
m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
hostap_deliver_data(vap, ni, m);
}
static void
ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
int reassoc, int resp, const char *tag, int rate)
{
IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
"deny %s request, %s rate set mismatch, rate/MCS %d",
reassoc ? "reassoc" : "assoc", tag, rate & IEEE80211_RATE_VAL);
IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_BASIC_RATE);
ieee80211_node_leave(ni);
}
static void
capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
int reassoc, int resp, const char *tag, int capinfo)
{
struct ieee80211vap *vap = ni->ni_vap;
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
"deny %s request, %s mismatch 0x%x",
reassoc ? "reassoc" : "assoc", tag, capinfo);
IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_CAPINFO);
ieee80211_node_leave(ni);
vap->iv_stats.is_rx_assoc_capmismatch++;
}
static void
htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
int reassoc, int resp)
{
IEEE80211_NOTE_MAC(ni->ni_vap, IEEE80211_MSG_ANY, wh->i_addr2,
"deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
/* XXX no better code */
IEEE80211_SEND_MGMT(ni, resp, IEEE80211_STATUS_MISSING_HT_CAPS);
ieee80211_node_leave(ni);
}
static void
authalgreject(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
int algo, int seq, int status)
{
struct ieee80211vap *vap = ni->ni_vap;
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, NULL, "unsupported alg %d", algo);
vap->iv_stats.is_rx_auth_unsupported++;
ieee80211_send_error(ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH,
seq | (status << 16));
}
static __inline int
ishtmixed(const uint8_t *ie)
{
const struct ieee80211_ie_htinfo *ht =
(const struct ieee80211_ie_htinfo *) ie;
return (ht->hi_byte2 & IEEE80211_HTINFO_OPMODE) ==
IEEE80211_HTINFO_OPMODE_MIXED;
}
static int
is11bclient(const uint8_t *rates, const uint8_t *xrates)
{
static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
int i;
/* NB: the 11b clients we care about will not have xrates */
if (xrates != NULL || rates == NULL)
return 0;
for (i = 0; i < rates[1]; i++) {
int r = rates[2+i] & IEEE80211_RATE_VAL;
if (r > 2*11 || ((1<<r) & brates) == 0)
return 0;
}
return 1;
}
static void
hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
int subtype, int rssi, int nf)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_frame *wh;
uint8_t *frm, *efrm, *sfrm;
uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
int reassoc, resp;
uint8_t rate;
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;
/*
* We process beacon/probe response frames when scanning;
* otherwise we check beacon frames for overlapping non-ERP
* BSS in 11g and/or overlapping legacy BSS when in HT.
*/
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0 &&
subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
/* NB: accept off-channel frames */
if (ieee80211_parse_beacon(ni, m0, &scan) &~ IEEE80211_BPARSE_OFFCHAN)
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);
/*
* If scanning, just pass information to the scan module.
*/
if (ic->ic_flags & IEEE80211_F_SCAN) {
if (scan.status == 0 && /* NB: on channel */
(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, &scan, wh, subtype, rssi, nf);
return;
}
/*
* Check beacon for overlapping bss w/ non ERP stations.
* If we detect one and protection is configured but not
* enabled, enable it and start a timer that'll bring us
* out if we stop seeing the bss.
*/
if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
scan.status == 0 && /* NB: on-channel */
((scan.erp & 0x100) == 0 || /* NB: no ERP, 11b sta*/
(scan.erp & IEEE80211_ERP_NON_ERP_PRESENT))) {
ic->ic_lastnonerp = ticks;
ic->ic_flags_ext |= IEEE80211_FEXT_NONERP_PR;
if (ic->ic_protmode != IEEE80211_PROT_NONE &&
(ic->ic_flags & IEEE80211_F_USEPROT) == 0) {
IEEE80211_NOTE_FRAME(vap,
IEEE80211_MSG_ASSOC, wh,
"non-ERP present on channel %d "
"(saw erp 0x%x from channel %d), "
"enable use of protection",
ic->ic_curchan->ic_ieee,
scan.erp, scan.chan);
ic->ic_flags |= IEEE80211_F_USEPROT;
ieee80211_notify_erp(ic);
}
}
/*
* Check beacon for non-HT station on HT channel
* and update HT BSS occupancy as appropriate.
*/
if (IEEE80211_IS_CHAN_HT(ic->ic_curchan)) {
if (scan.status & IEEE80211_BPARSE_OFFCHAN) {
/*
* Off control channel; only check frames
* that come in the extension channel when
* operating w/ HT40.
*/
if (!IEEE80211_IS_CHAN_HT40(ic->ic_curchan))
break;
if (scan.chan != ic->ic_curchan->ic_extieee)
break;
}
if (scan.htinfo == NULL) {
ieee80211_htprot_update(ic,
IEEE80211_HTINFO_OPMODE_PROTOPT |
IEEE80211_HTINFO_NONHT_PRESENT);
} else if (ishtmixed(scan.htinfo)) {
/* XXX? take NONHT_PRESENT from beacon? */
ieee80211_htprot_update(ic,
IEEE80211_HTINFO_OPMODE_MIXED |
IEEE80211_HTINFO_NONHT_PRESENT);
}
}
break;
}
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
if (vap->iv_state != IEEE80211_S_RUN) {
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
/*
* prreq frame format
* [tlv] ssid
* [tlv] supported rates
* [tlv] extended supported rates
*/
ssid = rates = xrates = NULL;
sfrm = frm;
while (efrm - frm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
switch (*frm) {
case IEEE80211_ELEMID_SSID:
ssid = frm;
break;
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
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);
IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL,
"%s", "no ssid with ssid suppression enabled");
vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
return;
}
/* XXX find a better class or define it's own */
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
"%s", "recv probe req");
/*
* Some legacy 11b clients cannot hack a complete
* probe response frame. When the request includes
* only a bare-bones rate set, communicate this to
* the transmit side.
*/
ieee80211_send_proberesp(vap, wh->i_addr2,
is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
break;
case IEEE80211_FC0_SUBTYPE_AUTH: {
uint16_t algo, seq, status;
if (vap->iv_state != IEEE80211_S_RUN) {
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, NULL, "%s", "wrong bssid");
vap->iv_stats.is_rx_wrongbss++; /*XXX unique stat?*/
return;
}
/*
* 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);
/*
* Consult the ACL policy module if setup.
*/
if (vap->iv_acl != NULL &&
!vap->iv_acl->iac_check(vap, wh->i_addr2)) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_ACL,
wh, NULL, "%s", "disallowed by ACL");
vap->iv_stats.is_rx_acl++;
ieee80211_send_error(ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
return;
}
if (vap->iv_flags & IEEE80211_F_COUNTERM) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
wh, NULL, "%s", "TKIP countermeasures enabled");
vap->iv_stats.is_rx_auth_countermeasures++;
ieee80211_send_error(ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_AUTH,
IEEE80211_REASON_MIC_FAILURE);
return;
}
if (algo == IEEE80211_AUTH_ALG_SHARED)
hostap_auth_shared(ni, wh, frm + 6, efrm, rssi, nf,
seq, status);
else if (algo == IEEE80211_AUTH_ALG_OPEN)
hostap_auth_open(ni, wh, rssi, nf, seq, status);
else if (algo == IEEE80211_AUTH_ALG_LEAP) {
authalgreject(ni, wh, algo,
seq+1, IEEE80211_STATUS_ALG);
return;
} else {
/*
* We assume that an unknown algorithm is the result
* of a decryption failure on a shared key auth frame;
* return a status code appropriate for that instead
* of IEEE80211_STATUS_ALG.
*
* NB: a seq# of 4 is intentional; the decrypted
* frame likely has a bogus seq value.
*/
authalgreject(ni, wh, algo,
4, IEEE80211_STATUS_CHALLENGE);
return;
}
break;
}
case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
uint16_t capinfo, lintval;
struct ieee80211_rsnparms rsnparms;
if (vap->iv_state != IEEE80211_S_RUN) {
vap->iv_stats.is_rx_mgtdiscard++;
return;
}
if (!IEEE80211_ADDR_EQ(wh->i_addr3, vap->iv_bss->ni_bssid)) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, NULL, "%s", "wrong bssid");
vap->iv_stats.is_rx_assoc_bss++;
return;
}
if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
reassoc = 1;
resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
} else {
reassoc = 0;
resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
}
if (ni == vap->iv_bss) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY, wh->i_addr2,
"deny %s request, sta not authenticated",
reassoc ? "reassoc" : "assoc");
ieee80211_send_error(ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_ASSOC_NOT_AUTHED);
vap->iv_stats.is_rx_assoc_notauth++;
return;
}
/*
* asreq frame format
* [2] capability information
* [2] listen interval
* [6*] current AP address (reassoc only)
* [tlv] ssid
* [tlv] supported rates
* [tlv] extended supported rates
* [tlv] WPA or RSN
* [tlv] HT capabilities
* [tlv] Atheros capabilities
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
capinfo = le16toh(*(uint16_t *)frm); frm += 2;
lintval = le16toh(*(uint16_t *)frm); frm += 2;
if (reassoc)
frm += 6; /* ignore current AP info */
ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
sfrm = frm;
while (efrm - frm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
switch (*frm) {
case IEEE80211_ELEMID_SSID:
ssid = frm;
break;
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
case IEEE80211_ELEMID_RSN:
rsn = frm;
break;
case IEEE80211_ELEMID_HTCAP:
htcap = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(frm))
wpa = frm;
else if (iswmeinfo(frm))
wme = frm;
#ifdef IEEE80211_SUPPORT_SUPERG
else if (isatherosoui(frm))
ath = frm;
#endif
else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
if (ishtcapoui(frm) && htcap == NULL)
htcap = frm;
}
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);
IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
if (htcap != NULL) {
IEEE80211_VERIFY_LENGTH(htcap[1],
htcap[0] == IEEE80211_ELEMID_VENDOR ?
4 + sizeof(struct ieee80211_ie_htcap)-2 :
sizeof(struct ieee80211_ie_htcap)-2,
return); /* XXX just NULL out? */
}
if ((vap->iv_flags & IEEE80211_F_WPA) &&
!wpa_assocreq(ni, &rsnparms, wh, wpa, rsn, capinfo))
return;
/* discard challenge after association */
if (ni->ni_challenge != NULL) {
free(ni->ni_challenge, M_80211_NODE);
ni->ni_challenge = NULL;
}
/* NB: 802.11 spec says to ignore station's privacy bit */
if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
capinfomismatch(ni, wh, reassoc, resp,
"capability", capinfo);
return;
}
/*
* Disallow re-associate w/ invalid slot time setting.
*/
if (ni->ni_associd != 0 &&
IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
capinfomismatch(ni, wh, reassoc, resp,
"slot time", capinfo);
return;
}
rate = ieee80211_setup_rates(ni, rates, xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (rate & IEEE80211_RATE_BASIC) {
ratesetmismatch(ni, wh, reassoc, resp, "legacy", rate);
vap->iv_stats.is_rx_assoc_norate++;
return;
}
/*
* If constrained to 11g-only stations reject an
* 11b-only station. We cheat a bit here by looking
* at the max negotiated xmit rate and assuming anyone
* with a best rate <24Mb/s is an 11b station.
*/
if ((vap->iv_flags & IEEE80211_F_PUREG) && rate < 48) {
ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
vap->iv_stats.is_rx_assoc_norate++;
return;
}
/*
* Do HT rate set handling and setup HT node state.
*/
ni->ni_chan = vap->iv_bss->ni_chan;
if (IEEE80211_IS_CHAN_HT(ni->ni_chan) && htcap != NULL) {
rate = ieee80211_setup_htrates(ni, htcap,
IEEE80211_F_DOFMCS | IEEE80211_F_DONEGO |
IEEE80211_F_DOBRS);
if (rate & IEEE80211_RATE_BASIC) {
ratesetmismatch(ni, wh, reassoc, resp,
"HT", rate);
vap->iv_stats.is_ht_assoc_norate++;
return;
}
ieee80211_ht_node_init(ni);
ieee80211_ht_updatehtcap(ni, htcap);
} else if (ni->ni_flags & IEEE80211_NODE_HT)
ieee80211_ht_node_cleanup(ni);
#ifdef IEEE80211_SUPPORT_SUPERG
else if (ni->ni_ath_flags & IEEE80211_NODE_ATH)
ieee80211_ff_node_cleanup(ni);
#endif
/*
* Allow AMPDU operation only with unencrypted traffic
* or AES-CCM; the 11n spec only specifies these ciphers
* so permitting any others is undefined and can lead
* to interoperability problems.
*/
if ((ni->ni_flags & IEEE80211_NODE_HT) &&
(((vap->iv_flags & IEEE80211_F_WPA) &&
rsnparms.rsn_ucastcipher != IEEE80211_CIPHER_AES_CCM) ||
(vap->iv_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
"disallow HT use because WEP or TKIP requested, "
"capinfo 0x%x ucastcipher %d", capinfo,
rsnparms.rsn_ucastcipher);
ieee80211_ht_node_cleanup(ni);
vap->iv_stats.is_ht_assoc_downgrade++;
}
/*
* If constrained to 11n-only stations reject legacy stations.
*/
if ((vap->iv_flags_ht & IEEE80211_FHT_PUREN) &&
(ni->ni_flags & IEEE80211_NODE_HT) == 0) {
htcapmismatch(ni, wh, reassoc, resp);
vap->iv_stats.is_ht_assoc_nohtcap++;
return;
}
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = nf;
ni->ni_intval = lintval;
ni->ni_capinfo = capinfo;
ni->ni_fhdwell = vap->iv_bss->ni_fhdwell;
ni->ni_fhindex = vap->iv_bss->ni_fhindex;
/*
* Store the IEs.
* XXX maybe better to just expand
*/
if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) {
#define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off)
if (wpa != NULL)
setie(wpa_ie, wpa - sfrm);
if (rsn != NULL)
setie(rsn_ie, rsn - sfrm);
if (htcap != NULL)
setie(htcap_ie, htcap - sfrm);
if (wme != NULL) {
setie(wme_ie, wme - sfrm);
/*
* Mark node as capable of QoS.
*/
ni->ni_flags |= IEEE80211_NODE_QOS;
} else
ni->ni_flags &= ~IEEE80211_NODE_QOS;
#ifdef IEEE80211_SUPPORT_SUPERG
if (ath != NULL) {
setie(ath_ie, ath - sfrm);
/*
* Parse ATH station parameters.
*/
ieee80211_parse_ath(ni, ni->ni_ies.ath_ie);
} else
#endif
ni->ni_ath_flags = 0;
#undef setie
} else {
ni->ni_flags &= ~IEEE80211_NODE_QOS;
ni->ni_ath_flags = 0;
}
ieee80211_node_join(ni, resp);
ieee80211_deliver_l2uf(ni);
break;
}
case IEEE80211_FC0_SUBTYPE_DEAUTH:
case IEEE80211_FC0_SUBTYPE_DISASSOC: {
uint16_t reason;
if (vap->iv_state != IEEE80211_S_RUN ||
/* NB: can happen when in promiscuous mode */
!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr)) {
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
/*
* deauth/disassoc frame format
* [2] reason
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
reason = le16toh(*(uint16_t *)frm);
if (subtype == IEEE80211_FC0_SUBTYPE_DEAUTH) {
vap->iv_stats.is_rx_deauth++;
IEEE80211_NODE_STAT(ni, rx_deauth);
} else {
vap->iv_stats.is_rx_disassoc++;
IEEE80211_NODE_STAT(ni, rx_disassoc);
}
IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
"recv %s (reason %d)", ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT], reason);
if (ni != vap->iv_bss)
ieee80211_node_leave(ni);
break;
}
case IEEE80211_FC0_SUBTYPE_ACTION:
if (vap->iv_state == IEEE80211_S_RUN) {
if (ieee80211_parse_action(ni, m0) == 0)
ic->ic_recv_action(ni, wh, frm, efrm);
} else
vap->iv_stats.is_rx_mgtdiscard++;
break;
case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
default:
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, "mgt", "subtype 0x%x not handled", subtype);
vap->iv_stats.is_rx_badsubtype++;
break;
}
}
static void
hostap_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
{
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_PS_POLL:
hostap_recv_pspoll(ni, m);
break;
case IEEE80211_FC0_SUBTYPE_BAR:
ieee80211_recv_bar(ni, m);
break;
}
}
/*
* Process a received ps-poll frame.
*/
static void
hostap_recv_pspoll(struct ieee80211_node *ni, struct mbuf *m0)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_frame_min *wh;
struct ifnet *ifp;
struct mbuf *m;
uint16_t aid;
int qlen;
wh = mtod(m0, struct ieee80211_frame_min *);
if (ni->ni_associd == 0) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
(struct ieee80211_frame *) wh, NULL,
"%s", "unassociated station");
vap->iv_stats.is_ps_unassoc++;
IEEE80211_SEND_MGMT(ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_NOT_ASSOCED);
return;
}
aid = le16toh(*(uint16_t *)wh->i_dur);
if (aid != ni->ni_associd) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
(struct ieee80211_frame *) wh, NULL,
"aid mismatch: sta aid 0x%x poll aid 0x%x",
ni->ni_associd, aid);
vap->iv_stats.is_ps_badaid++;
/*
* NB: We used to deauth the station but it turns out
* the Blackberry Curve 8230 (and perhaps other devices)
* sometimes send the wrong AID when WME is negotiated.
* Being more lenient here seems ok as we already check
* the station is associated and we only return frames
* queued for the station (i.e. we don't use the AID).
*/
return;
}
/* Okay, take the first queued packet and put it out... */
m = ieee80211_node_psq_dequeue(ni, &qlen);
if (m == NULL) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_POWER, wh->i_addr2,
"%s", "recv ps-poll, but queue empty");
ieee80211_send_nulldata(ieee80211_ref_node(ni));
vap->iv_stats.is_ps_qempty++; /* XXX node stat */
if (vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 0); /* just in case */
return;
}
/*
* If there are more packets, set the more packets bit
* in the packet dispatched to the station; otherwise
* turn off the TIM bit.
*/
if (qlen != 0) {
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"recv ps-poll, send packet, %u still queued", qlen);
m->m_flags |= M_MORE_DATA;
} else {
IEEE80211_NOTE(vap, IEEE80211_MSG_POWER, ni,
"%s", "recv ps-poll, send packet, queue empty");
if (vap->iv_set_tim != NULL)
vap->iv_set_tim(ni, 0);
}
m->m_flags |= M_PWR_SAV; /* bypass PS handling */
if (m->m_flags & M_ENCAP)
ifp = vap->iv_ic->ic_ifp;
else
ifp = vap->iv_ifp;
IF_ENQUEUE(&ifp->if_snd, m);
if_start(ifp);
}
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