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freebsd/sys/net80211/ieee80211_input.c

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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net/if_llc.h>
#include <net/if_vlan_var.h>
#include <net80211/ieee80211_var.h>
#include <net/bpf.h>
#ifdef IEEE80211_DEBUG
#include <machine/stdarg.h>
/*
* 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 ieee80211com *ic, int subtype)
{
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_BEACON:
return (ic->ic_flags & IEEE80211_F_SCAN);
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
return (ic->ic_opmode == IEEE80211_M_IBSS);
}
return 1;
}
/*
* Emit a debug message about discarding a frame or information
* element. One format is for extracting the mac address from
* the frame header; the other is for when a header is not
* available or otherwise appropriate.
*/
#define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...) do { \
if ((_ic)->ic_debug & (_m)) \
ieee80211_discard_frame(_ic, _wh, _type, _fmt, __VA_ARGS__);\
} while (0)
#define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...) do { \
if ((_ic)->ic_debug & (_m)) \
ieee80211_discard_ie(_ic, _wh, _type, _fmt, __VA_ARGS__);\
} while (0)
#define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...) do { \
if ((_ic)->ic_debug & (_m)) \
ieee80211_discard_mac(_ic, _mac, _type, _fmt, __VA_ARGS__);\
} while (0)
static const u_int8_t *ieee80211_getbssid(struct ieee80211com *,
const struct ieee80211_frame *);
static void ieee80211_discard_frame(struct ieee80211com *,
const struct ieee80211_frame *, const char *type, const char *fmt, ...);
static void ieee80211_discard_ie(struct ieee80211com *,
const struct ieee80211_frame *, const char *type, const char *fmt, ...);
static void ieee80211_discard_mac(struct ieee80211com *,
const u_int8_t mac[IEEE80211_ADDR_LEN], const char *type,
const char *fmt, ...);
#else
#define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...)
#define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...)
#define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...)
#endif /* IEEE80211_DEBUG */
static struct mbuf *ieee80211_defrag(struct ieee80211com *,
struct ieee80211_node *, struct mbuf *);
static struct mbuf *ieee80211_decap(struct ieee80211com *, struct mbuf *);
static void ieee80211_node_pwrsave(struct ieee80211_node *, int enable);
static void ieee80211_recv_pspoll(struct ieee80211com *,
struct ieee80211_node *, struct mbuf *);
/*
* 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 ic_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.
*/
int
ieee80211_input(struct ieee80211com *ic, struct mbuf *m,
struct ieee80211_node *ni, int rssi, u_int32_t rstamp)
{
#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
#define HAS_SEQ(type) ((type & 0x4) == 0)
struct ifnet *ifp = ic->ic_ifp;
struct ieee80211_frame *wh;
struct ieee80211_key *key;
struct ether_header *eh;
int len, hdrsize, off;
u_int8_t dir, type, subtype;
u_int8_t *bssid;
u_int16_t rxseq;
KASSERT(ni != NULL, ("null node"));
ni->ni_inact = ni->ni_inact_reload;
/* trim CRC here so WEP can find its own CRC at the end of packet. */
if (m->m_flags & M_HASFCS) {
m_adj(m, -IEEE80211_CRC_LEN);
m->m_flags &= ~M_HASFCS;
}
KASSERT(m->m_pkthdr.len >= sizeof(struct ieee80211_frame_min),
("frame length too short: %u", m->m_pkthdr.len));
type = -1; /* undefined */
/*
* In monitor mode, send everything directly to bpf.
* XXX may want to include the CRC
*/
if (ic->ic_opmode == IEEE80211_M_MONITOR)
goto out;
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL,
"too short (1): len %u", m->m_pkthdr.len);
ic->ic_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(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]);
ic->ic_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) {
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
bssid = wh->i_addr2;
if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
/* not interested in */
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT,
bssid, NULL, "%s", "not to bss");
ic->ic_stats.is_rx_wrongbss++;
goto out;
}
break;
case IEEE80211_M_IBSS:
case IEEE80211_M_AHDEMO:
case IEEE80211_M_HOSTAP:
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(ic,
IEEE80211_MSG_ANY, ni->ni_macaddr,
NULL, "too short (2): len %u",
m->m_pkthdr.len);
ic->ic_stats.is_rx_tooshort++;
goto out;
}
bssid = wh->i_addr3;
}
if (type != IEEE80211_FC0_TYPE_DATA)
break;
/*
* Data frame, validate the bssid.
*/
if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) &&
!IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
/* not interested in */
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT,
bssid, NULL, "%s", "not to bss");
ic->ic_stats.is_rx_wrongbss++;
goto out;
}
/*
* For adhoc mode we cons up a node when it doesn't
* exist. This should probably done after an ACL check.
*/
if (ni == ic->ic_bss &&
ic->ic_opmode != IEEE80211_M_HOSTAP) {
/*
* Fake up a node for this newly
* discovered member of the IBSS.
*/
ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta,
wh->i_addr2);
if (ni == NULL) {
/* NB: stat kept for alloc failure */
goto err;
}
}
break;
default:
goto out;
}
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
if (HAS_SEQ(type)) {
u_int8_t tid;
if (IEEE80211_QOS_HAS_SEQ(wh)) {
tid = ((struct ieee80211_qosframe *)wh)->
i_qos[0] & IEEE80211_QOS_TID;
if (tid >= WME_AC_VI)
ic->ic_wme.wme_hipri_traffic++;
tid++;
} else
tid = 0;
rxseq = le16toh(*(u_int16_t *)wh->i_seq);
if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
/* duplicate, discard */
IEEE80211_DISCARD_MAC(ic, 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);
ic->ic_stats.is_rx_dup++;
IEEE80211_NODE_STAT(ni, rx_dup);
goto out;
}
ni->ni_rxseqs[tid] = rxseq;
}
}
switch (type) {
case IEEE80211_FC0_TYPE_DATA:
hdrsize = ieee80211_hdrsize(wh);
if (ic->ic_flags & IEEE80211_F_DATAPAD)
hdrsize = roundup(hdrsize, sizeof(u_int32_t));
if (m->m_len < hdrsize &&
(m = m_pullup(m, hdrsize)) == NULL) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL,
"data too short: expecting %u", hdrsize);
ic->ic_stats.is_rx_tooshort++;
goto out; /* XXX */
}
if (subtype & IEEE80211_FC0_SUBTYPE_QOS) {
/* XXX discard if node w/o IEEE80211_NODE_QOS? */
/*
* Strip QoS control and any padding so only a
* stock 802.11 header is at the front.
*/
/* XXX 4-address QoS frame */
off = hdrsize - sizeof(struct ieee80211_frame);
ovbcopy(mtod(m, u_int8_t *), mtod(m, u_int8_t *) + off,
hdrsize - off);
m_adj(m, off);
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[0] &= ~IEEE80211_FC0_SUBTYPE_QOS;
} else {
/* XXX copy up for 4-address frames w/ padding */
}
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
if (dir != IEEE80211_FC1_DIR_FROMDS) {
ic->ic_stats.is_rx_wrongdir++;
goto out;
}
if ((ifp->if_flags & IFF_SIMPLEX) &&
IEEE80211_IS_MULTICAST(wh->i_addr1) &&
IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) {
/*
* In IEEE802.11 network, multicast packet
* sent from me is broadcasted from AP.
* It should be silently discarded for
* SIMPLEX interface.
*/
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, NULL, "%s", "multicast echo");
ic->ic_stats.is_rx_mcastecho++;
goto out;
}
break;
case IEEE80211_M_IBSS:
case IEEE80211_M_AHDEMO:
if (dir != IEEE80211_FC1_DIR_NODS) {
ic->ic_stats.is_rx_wrongdir++;
goto out;
}
/* XXX no power-save support */
break;
case IEEE80211_M_HOSTAP:
if (dir != IEEE80211_FC1_DIR_TODS) {
ic->ic_stats.is_rx_wrongdir++;
goto out;
}
/* check if source STA is associated */
if (ni == ic->ic_bss) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "%s", "unknown src");
/* NB: caller deals with reference */
ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);
if (ni != NULL) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_NOT_AUTHED);
ieee80211_free_node(ni);
}
ic->ic_stats.is_rx_notassoc++;
goto err;
}
if (ni->ni_associd == 0) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "%s", "unassoc src");
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_NOT_ASSOCED);
ic->ic_stats.is_rx_notassoc++;
goto err;
}
/*
* Check for power save state change.
*/
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);
break;
default:
/* XXX here to keep compiler happy */
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_WEP) {
if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) {
/*
* Discard encrypted frames when privacy is off.
*/
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "WEP", "%s", "PRIVACY off");
ic->ic_stats.is_rx_noprivacy++;
IEEE80211_NODE_STAT(ni, rx_noprivacy);
goto out;
}
key = ieee80211_crypto_decap(ic, ni, m);
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 {
key = NULL;
}
/*
* Next up, any fragmentation.
*/
if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
m = ieee80211_defrag(ic, ni, m);
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(ic, key, m)) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT,
ni->ni_macaddr, "data", "%s", "demic error");
IEEE80211_NODE_STAT(ni, rx_demicfail);
goto out;
}
/* copy to listener after decrypt */
if (ic->ic_rawbpf)
bpf_mtap(ic->ic_rawbpf, m);
/*
* Finally, strip the 802.11 header.
*/
m = ieee80211_decap(ic, m);
if (m == NULL) {
/* don't count Null data frames as errors */
if (subtype == IEEE80211_FC0_SUBTYPE_NODATA)
goto out;
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT,
ni->ni_macaddr, "data", "%s", "decap error");
ic->ic_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(ic, IEEE80211_MSG_INPUT,
eh->ether_shost, "data",
"unauthorized port: ether type 0x%x len %u",
eh->ether_type, m->m_pkthdr.len);
ic->ic_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 ((ic->ic_flags & IEEE80211_F_DROPUNENC) &&
key == NULL &&
eh->ether_type != htons(ETHERTYPE_PAE)) {
/*
* Drop unencrypted frames.
*/
ic->ic_stats.is_rx_unencrypted++;
IEEE80211_NODE_STAT(ni, rx_unencrypted);
goto out;
}
}
ifp->if_ipackets++;
IEEE80211_NODE_STAT(ni, rx_data);
IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
/* perform as a bridge within the AP */
if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
(ic->ic_flags & IEEE80211_F_NOBRIDGE) == 0) {
struct mbuf *m1 = NULL;
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
m1 = m_copypacket(m, M_DONTWAIT);
if (m1 == NULL)
ifp->if_oerrors++;
else
m1->m_flags |= M_MCAST;
} else {
/* XXX this dups work done in ieee80211_encap */
/* check if destination is associated */
struct ieee80211_node *ni1 =
ieee80211_find_node(&ic->ic_sta,
eh->ether_dhost);
if (ni1 != NULL) {
/* XXX check if authorized */
if (ni1->ni_associd != 0) {
m1 = m;
m = NULL;
}
/* XXX statistic? */
ieee80211_free_node(ni1);
}
}
if (m1 != NULL) {
len = m1->m_pkthdr.len;
IF_ENQUEUE(&ifp->if_snd, m1);
if (m != NULL)
ifp->if_omcasts++;
ifp->if_obytes += len;
}
}
if (m != NULL) {
if (ni->ni_vlan != 0) {
/* attach vlan tag */
/* XXX goto err? */
VLAN_INPUT_TAG(ifp, m, ni->ni_vlan, goto out);
}
(*ifp->if_input)(ifp, m);
}
return IEEE80211_FC0_TYPE_DATA;
case IEEE80211_FC0_TYPE_MGT:
IEEE80211_NODE_STAT(ni, rx_mgmt);
if (dir != IEEE80211_FC1_DIR_NODS) {
ic->ic_stats.is_rx_wrongdir++;
goto err;
}
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, "mgt", "too short: len %u",
m->m_pkthdr.len);
ic->ic_stats.is_rx_tooshort++;
goto out;
}
#ifdef IEEE80211_DEBUG
if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) ||
ieee80211_msg_dumppkts(ic)) {
if_printf(ic->ic_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(ic, IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "WEP set but not permitted");
ic->ic_stats.is_rx_mgtdiscard++; /* XXX */
goto out;
}
if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) {
/*
* Discard encrypted frames when privacy is off.
*/
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "mgt", "%s", "WEP set but PRIVACY off");
ic->ic_stats.is_rx_noprivacy++;
goto out;
}
key = ieee80211_crypto_decap(ic, ni, m);
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;
}
if (ic->ic_rawbpf)
bpf_mtap(ic->ic_rawbpf, m);
(*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, rstamp);
m_freem(m);
return type;
case IEEE80211_FC0_TYPE_CTL:
IEEE80211_NODE_STAT(ni, rx_ctrl);
ic->ic_stats.is_rx_ctl++;
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_PS_POLL:
ieee80211_recv_pspoll(ic, ni, m);
break;
}
}
goto out;
default:
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
wh, NULL, "bad frame type 0x%x", type);
/* should not come here */
break;
}
err:
ifp->if_ierrors++;
out:
if (m != NULL) {
if (ic->ic_rawbpf)
bpf_mtap(ic->ic_rawbpf, m);
m_freem(m);
}
return type;
#undef SEQ_LEQ
}
/*
* This function reassemble fragments.
*/
static struct mbuf *
ieee80211_defrag(struct ieee80211com *ic, struct ieee80211_node *ni,
struct mbuf *m)
{
struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
struct ieee80211_frame *lwh;
u_int16_t rxseq;
u_int8_t fragno;
u_int8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
struct mbuf *mfrag;
KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
rxseq = le16toh(*(u_int16_t *)wh->i_seq);
fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
/* Quick way out, if there's nothing to defragment */
if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
return m;
/*
* Remove frag to insure it doesn't get reaped by timer.
*/
if (ni->ni_table == NULL) {
/*
* Should never happen. If the node is orphaned (not in
* the table) then input packets should not reach here.
* Otherwise, a concurrent request that yanks the table
* should be blocked by other interlocking and/or by first
* shutting the driver down. Regardless, be defensive
* here and just bail
*/
/* XXX need msg+stat */
m_freem(m);
return NULL;
}
IEEE80211_NODE_LOCK(ni->ni_table);
mfrag = ni->ni_rxfrag[0];
ni->ni_rxfrag[0] = NULL;
IEEE80211_NODE_UNLOCK(ni->ni_table);
/*
* Validate new fragment is in order and
* related to the previous ones.
*/
if (mfrag != NULL) {
u_int16_t last_rxseq;
lwh = mtod(mfrag, struct ieee80211_frame *);
last_rxseq = le16toh(*(u_int16_t *)lwh->i_seq);
/* NB: check seq # and frag together */
if (rxseq != last_rxseq+1 ||
!IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) ||
!IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
/*
* Unrelated fragment or no space for it,
* clear current fragments.
*/
m_freem(mfrag);
mfrag = NULL;
}
}
if (mfrag == NULL) {
if (fragno != 0) { /* !first fragment, discard */
IEEE80211_NODE_STAT(ni, rx_defrag);
m_freem(m);
return NULL;
}
mfrag = m;
} else { /* concatenate */
m_cat(mfrag, m);
/* NB: m_cat doesn't update the packet header */
mfrag->m_pkthdr.len += m->m_pkthdr.len;
/* track last seqnum and fragno */
lwh = mtod(mfrag, struct ieee80211_frame *);
*(u_int16_t *) lwh->i_seq = *(u_int16_t *) wh->i_seq;
}
if (more_frag) { /* more to come, save */
ni->ni_rxfragstamp = ticks;
ni->ni_rxfrag[0] = mfrag;
mfrag = NULL;
}
return mfrag;
}
static struct mbuf *
ieee80211_decap(struct ieee80211com *ic, struct mbuf *m)
{
struct ieee80211_frame wh; /* NB: QoS stripped above */
struct ether_header *eh;
struct llc *llc;
if (m->m_len < sizeof(wh) + sizeof(*llc) &&
(m = m_pullup(m, sizeof(wh) + sizeof(*llc))) == NULL) {
/* XXX stat, msg */
return NULL;
}
memcpy(&wh, mtod(m, caddr_t), sizeof(wh));
llc = (struct llc *)(mtod(m, caddr_t) + sizeof(wh));
if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) {
m_adj(m, sizeof(wh) + sizeof(struct llc) - sizeof(*eh));
llc = NULL;
} else {
m_adj(m, sizeof(wh) - sizeof(*eh));
}
eh = mtod(m, struct ether_header *);
switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
case IEEE80211_FC1_DIR_NODS:
IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
break;
case IEEE80211_FC1_DIR_TODS:
IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
break;
case IEEE80211_FC1_DIR_FROMDS:
IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
break;
case IEEE80211_FC1_DIR_DSTODS:
/* not yet supported */
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
&wh, "data", "%s", "DS to DS not supported");
m_freem(m);
return NULL;
}
#ifdef ALIGNED_POINTER
if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), u_int32_t)) {
struct mbuf *n, *n0, **np;
caddr_t newdata;
int off, pktlen;
n0 = NULL;
np = &n0;
off = 0;
pktlen = m->m_pkthdr.len;
while (pktlen > off) {
if (n0 == NULL) {
MGETHDR(n, M_DONTWAIT, MT_DATA);
if (n == NULL) {
m_freem(m);
return NULL;
}
M_MOVE_PKTHDR(n, m);
n->m_len = MHLEN;
} else {
MGET(n, M_DONTWAIT, MT_DATA);
if (n == NULL) {
m_freem(m);
m_freem(n0);
return NULL;
}
n->m_len = MLEN;
}
if (pktlen - off >= MINCLSIZE) {
MCLGET(n, M_DONTWAIT);
if (n->m_flags & M_EXT)
n->m_len = n->m_ext.ext_size;
}
if (n0 == NULL) {
newdata =
(caddr_t)ALIGN(n->m_data + sizeof(*eh)) -
sizeof(*eh);
n->m_len -= newdata - n->m_data;
n->m_data = newdata;
}
if (n->m_len > pktlen - off)
n->m_len = pktlen - off;
m_copydata(m, off, n->m_len, mtod(n, caddr_t));
off += n->m_len;
*np = n;
np = &n->m_next;
}
m_freem(m);
m = n0;
}
#endif /* ALIGNED_POINTER */
if (llc != NULL) {
eh = mtod(m, struct ether_header *);
eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
}
return m;
}
/*
* Install received rate set information in the node's state block.
*/
static int
ieee80211_setup_rates(struct ieee80211com *ic, struct ieee80211_node *ni,
u_int8_t *rates, u_int8_t *xrates, int flags)
{
struct ieee80211_rateset *rs = &ni->ni_rates;
memset(rs, 0, sizeof(*rs));
rs->rs_nrates = rates[1];
memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
if (xrates != NULL) {
u_int8_t nxrates;
/*
* Tack on 11g extended supported rate element.
*/
nxrates = xrates[1];
if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE,
"[%s] extended rate set too large;"
" only using %u of %u rates\n",
ether_sprintf(ni->ni_macaddr), nxrates, xrates[1]);
ic->ic_stats.is_rx_rstoobig++;
}
memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
rs->rs_nrates += nxrates;
}
return ieee80211_fix_rate(ic, ni, flags);
}
static void
ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh,
struct ieee80211_node *ni, int rssi, u_int32_t rstamp, u_int16_t seq,
u_int16_t status)
{
switch (ic->ic_opmode) {
case IEEE80211_M_IBSS:
if (ic->ic_state != IEEE80211_S_RUN ||
seq != IEEE80211_AUTH_OPEN_REQUEST) {
ic->ic_stats.is_rx_bad_auth++;
return;
}
ieee80211_new_state(ic, IEEE80211_S_AUTH,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
break;
case IEEE80211_M_AHDEMO:
/* should not come here */
break;
case IEEE80211_M_HOSTAP:
if (ic->ic_state != IEEE80211_S_RUN ||
seq != IEEE80211_AUTH_OPEN_REQUEST) {
ic->ic_stats.is_rx_bad_auth++;
return;
}
/* always accept open authentication requests */
if (ni == ic->ic_bss) {
ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);
if (ni == NULL)
return;
} else
(void) ieee80211_ref_node(ni);
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] station authenticated (open)\n",
ether_sprintf(ni->ni_macaddr));
break;
case IEEE80211_M_STA:
if (ic->ic_state != IEEE80211_S_AUTH ||
seq != IEEE80211_AUTH_OPEN_RESPONSE) {
ic->ic_stats.is_rx_bad_auth++;
return;
}
if (status != 0) {
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] open auth failed (reason %d)\n",
ether_sprintf(ni->ni_macaddr), status);
/* XXX can this happen? */
if (ni != ic->ic_bss)
ni->ni_fails++;
ic->ic_stats.is_rx_auth_fail++;
return;
}
ieee80211_new_state(ic, IEEE80211_S_ASSOC,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
break;
case IEEE80211_M_MONITOR:
break;
}
}
static int
alloc_challenge(struct ieee80211com *ic, struct ieee80211_node *ni)
{
if (ni->ni_challenge == NULL)
MALLOC(ni->ni_challenge, u_int32_t*, IEEE80211_CHALLENGE_LEN,
M_DEVBUF, M_NOWAIT);
if (ni->ni_challenge == NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] shared key challenge alloc failed\n",
ether_sprintf(ni->ni_macaddr));
/* XXX statistic */
}
return (ni->ni_challenge != NULL);
}
/* XXX TODO: add statistics */
static void
ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh,
u_int8_t *frm, u_int8_t *efrm, struct ieee80211_node *ni, int rssi,
u_int32_t rstamp, u_int16_t seq, u_int16_t status)
{
u_int8_t *challenge;
int allocbs, estatus;
/*
* 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 ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) {
IEEE80211_DISCARD_MAC(ic, 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 OS X).
*/
if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
ni->ni_authmode != IEEE80211_AUTH_SHARED) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad sta auth mode %u", ni->ni_authmode);
ic->ic_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(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"ie %d/%d too long",
frm[0], (frm[1] + 2) - (efrm - frm));
ic->ic_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(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"%s", "no challenge");
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad challenge len %d", challenge[1]);
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
default:
break;
}
switch (ic->ic_opmode) {
case IEEE80211_M_MONITOR:
case IEEE80211_M_AHDEMO:
case IEEE80211_M_IBSS:
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad operating mode %u", ic->ic_opmode);
return;
case IEEE80211_M_HOSTAP:
if (ic->ic_state != IEEE80211_S_RUN) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad state %u", ic->ic_state);
estatus = IEEE80211_STATUS_ALG; /* XXX */
goto bad;
}
switch (seq) {
case IEEE80211_AUTH_SHARED_REQUEST:
if (ni == ic->ic_bss) {
ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);
if (ni == NULL) {
/* NB: no way to return an error */
return;
}
allocbs = 1;
} else {
(void) ieee80211_ref_node(ni);
allocbs = 0;
}
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
if (!alloc_challenge(ic, ni)) {
/* NB: don't return error so they rexmit */
return;
}
get_random_bytes(ni->ni_challenge,
IEEE80211_CHALLENGE_LEN);
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] shared key %sauth request\n",
ether_sprintf(ni->ni_macaddr),
allocbs ? "" : "re");
break;
case IEEE80211_AUTH_SHARED_RESPONSE:
if (ni == ic->ic_bss) {
IEEE80211_DISCARD_MAC(ic, 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(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key response",
"%s", "no challenge recorded");
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
if (memcmp(ni->ni_challenge, &challenge[2],
challenge[1]) != 0) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key response",
"%s", "challenge mismatch");
ic->ic_stats.is_rx_auth_fail++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] station authenticated (shared key)\n",
ether_sprintf(ni->ni_macaddr));
break;
default:
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad seq %d", seq);
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_SEQUENCE;
goto bad;
}
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
break;
case IEEE80211_M_STA:
if (ic->ic_state != IEEE80211_S_AUTH)
return;
switch (seq) {
case IEEE80211_AUTH_SHARED_PASS:
if (ni->ni_challenge != NULL) {
FREE(ni->ni_challenge, M_DEVBUF);
ni->ni_challenge = NULL;
}
if (status != 0) {
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] shared key auth failed (reason %d)\n",
ether_sprintf(ieee80211_getbssid(ic, wh)),
status);
/* XXX can this happen? */
if (ni != ic->ic_bss)
ni->ni_fails++;
ic->ic_stats.is_rx_auth_fail++;
return;
}
ieee80211_new_state(ic, IEEE80211_S_ASSOC,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
break;
case IEEE80211_AUTH_SHARED_CHALLENGE:
if (!alloc_challenge(ic, ni))
return;
/* XXX could optimize by passing recvd challenge */
memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
break;
default:
IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH,
wh, "shared key auth", "bad seq %d", seq);
ic->ic_stats.is_rx_bad_auth++;
return;
}
break;
}
return;
bad:
/*
* Send an error response; but only when operating as an AP.
*/
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
/* XXX hack to workaround calling convention */
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq + 1) | (estatus<<16));
}
}
/* Verify the existence and length of __elem or get out. */
#define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \
if ((__elem) == NULL) { \
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \
wh, ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
"%s", "no " #__elem ); \
ic->ic_stats.is_rx_elem_missing++; \
return; \
} \
if ((__elem)[1] > (__maxlen)) { \
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \
wh, ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
"bad " #__elem " len %d", (__elem)[1]); \
ic->ic_stats.is_rx_elem_toobig++; \
return; \
} \
} while (0)
#define IEEE80211_VERIFY_LENGTH(_len, _minlen) do { \
if ((_len) < (_minlen)) { \
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \
wh, ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
"%s", "ie too short"); \
ic->ic_stats.is_rx_elem_toosmall++; \
return; \
} \
} while (0)
#ifdef IEEE80211_DEBUG
static void
ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag,
u_int8_t mac[IEEE80211_ADDR_LEN], u_int8_t *ssid)
{
printf("[%s] discard %s frame, ssid mismatch: ",
ether_sprintf(mac), tag);
ieee80211_print_essid(ssid + 2, ssid[1]);
printf("\n");
}
#define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \
if ((_ssid)[1] != 0 && \
((_ssid)[1] != (_ni)->ni_esslen || \
memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \
if (ieee80211_msg_input(ic)) \
ieee80211_ssid_mismatch(ic, \
ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
wh->i_addr2, _ssid); \
ic->ic_stats.is_rx_ssidmismatch++; \
return; \
} \
} while (0)
#else /* !IEEE80211_DEBUG */
#define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \
if ((_ssid)[1] != 0 && \
((_ssid)[1] != (_ni)->ni_esslen || \
memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \
ic->ic_stats.is_rx_ssidmismatch++; \
return; \
} \
} while (0)
#endif /* !IEEE80211_DEBUG */
/* unalligned little endian access */
#define LE_READ_2(p) \
((u_int16_t) \
((((const u_int8_t *)(p))[0] ) | \
(((const u_int8_t *)(p))[1] << 8)))
#define LE_READ_4(p) \
((u_int32_t) \
((((const u_int8_t *)(p))[0] ) | \
(((const u_int8_t *)(p))[1] << 8) | \
(((const u_int8_t *)(p))[2] << 16) | \
(((const u_int8_t *)(p))[3] << 24)))
static int __inline
iswpaoui(const u_int8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
}
static int __inline
iswmeoui(const u_int8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI);
}
static int __inline
iswmeparam(const u_int8_t *frm)
{
return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
frm[6] == WME_PARAM_OUI_SUBTYPE;
}
static int __inline
iswmeinfo(const u_int8_t *frm)
{
return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
frm[6] == WME_INFO_OUI_SUBTYPE;
}
static int __inline
isatherosoui(const u_int8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
}
/*
* Convert a WPA cipher selector OUI to an internal
* cipher algorithm. Where appropriate we also
* record any key length.
*/
static int
wpa_cipher(u_int8_t *sel, u_int8_t *keylen)
{
#define WPA_SEL(x) (((x)<<24)|WPA_OUI)
u_int32_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(u_int8_t *sel)
{
#define WPA_SEL(x) (((x)<<24)|WPA_OUI)
u_int32_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
* and validate the parameters against what has been
* configured for the system.
*/
static int
ieee80211_parse_wpa(struct ieee80211com *ic, u_int8_t *frm,
struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
{
u_int8_t len = frm[1];
u_int32_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.
*/
KASSERT(ic->ic_flags & IEEE80211_F_WPA1,
("not WPA, flags 0x%x", ic->ic_flags));
if (len < 14) {
IEEE80211_DISCARD_IE(ic,
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: iswapoui already validated the OUI and type */
w = LE_READ_2(frm);
if (w != WPA_VERSION) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "bad version %u", w);
return IEEE80211_REASON_IE_INVALID;
}
frm += 2, len -= 2;
/* multicast/group cipher */
w = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
if (w != rsn->rsn_mcastcipher) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "mcast cipher mismatch; got %u, expected %u",
w, rsn->rsn_mcastcipher);
return IEEE80211_REASON_IE_INVALID;
}
frm += 4, len -= 4;
/* unicast ciphers */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4+2) {
IEEE80211_DISCARD_IE(ic,
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;
}
w &= rsn->rsn_ucastcipherset;
if (w == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "%s", "ucast cipher set empty");
return IEEE80211_REASON_IE_INVALID;
}
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(ic,
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;
}
w &= rsn->rsn_keymgmtset;
if (w == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "%s", "no acceptable key mgmt alg");
return IEEE80211_REASON_IE_INVALID;
}
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(u_int8_t *sel, u_int8_t *keylen)
{
#define RSN_SEL(x) (((x)<<24)|RSN_OUI)
u_int32_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(u_int8_t *sel)
{
#define RSN_SEL(x) (((x)<<24)|RSN_OUI)
u_int32_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 ieee80211com *ic, u_int8_t *frm,
struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
{
u_int8_t len = frm[1];
u_int32_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.
*/
KASSERT(ic->ic_flags & IEEE80211_F_WPA2,
("not RSN, flags 0x%x", ic->ic_flags));
if (len < 10) {
IEEE80211_DISCARD_IE(ic,
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(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "bad version %u", w);
return IEEE80211_REASON_IE_INVALID;
}
frm += 2, len -= 2;
/* multicast/group cipher */
w = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
if (w != rsn->rsn_mcastcipher) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "mcast cipher mismatch; got %u, expected %u",
w, rsn->rsn_mcastcipher);
return IEEE80211_REASON_IE_INVALID;
}
frm += 4, len -= 4;
/* unicast ciphers */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4+2) {
IEEE80211_DISCARD_IE(ic,
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;
}
w &= rsn->rsn_ucastcipherset;
if (w == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "%s", "ucast cipher set empty");
return IEEE80211_REASON_IE_INVALID;
}
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(ic,
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;
}
w &= rsn->rsn_keymgmtset;
if (w == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "%s", "no acceptable key mgmt alg");
return IEEE80211_REASON_IE_INVALID;
}
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;
}
static int
ieee80211_parse_wmeparams(struct ieee80211com *ic, u_int8_t *frm,
const struct ieee80211_frame *wh)
{
#define MS(_v, _f) (((_v) & _f) >> _f##_S)
struct ieee80211_wme_state *wme = &ic->ic_wme;
u_int len = frm[1], qosinfo;
int i;
if (len < sizeof(struct ieee80211_wme_param)-2) {
IEEE80211_DISCARD_IE(ic,
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 = LE_READ_2(frm+2);
frm += 4;
}
wme->wme_wmeChanParams.cap_info = qosinfo;
return 1;
#undef MS
}
static void
ieee80211_saveie(u_int8_t **iep, const u_int8_t *ie)
{
u_int ielen = ie[1]+2;
/*
* Record information element for later use.
*/
if (*iep == NULL || (*iep)[1] != ie[1]) {
if (*iep != NULL)
FREE(*iep, M_DEVBUF);
MALLOC(*iep, void*, ielen, M_DEVBUF, M_NOWAIT);
}
if (*iep != NULL)
memcpy(*iep, ie, ielen);
/* XXX note failure */
}
#ifdef IEEE80211_DEBUG
static void
dump_probe_beacon(u_int8_t subtype, int isnew,
const u_int8_t mac[IEEE80211_ADDR_LEN],
u_int8_t chan, u_int8_t bchan, u_int16_t capinfo, u_int16_t bintval,
u_int8_t erp, u_int8_t *ssid, u_int8_t *country)
{
printf("[%s] %s%s on chan %u (bss chan %u) ",
ether_sprintf(mac), isnew ? "new " : "",
ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT],
chan, bchan);
ieee80211_print_essid(ssid + 2, ssid[1]);
printf("\n");
if (isnew) {
printf("[%s] caps 0x%x bintval %u erp 0x%x",
ether_sprintf(mac), capinfo, bintval, erp);
if (country) {
#ifdef __FreeBSD__
printf(" country info %*D", country[1], country+2, " ");
#else
int i;
printf(" country info");
for (i = 0; i < country[1]; i++)
printf(" %02x", country[i+2]);
#endif
}
printf("\n");
}
}
#endif /* IEEE80211_DEBUG */
void
ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0,
struct ieee80211_node *ni,
int subtype, int rssi, u_int32_t rstamp)
{
#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
struct ieee80211_frame *wh;
u_int8_t *frm, *efrm;
u_int8_t *ssid, *rates, *xrates, *wpa, *wme;
int reassoc, resp, allocbs;
wh = mtod(m0, struct ieee80211_frame *);
frm = (u_int8_t *)&wh[1];
efrm = mtod(m0, u_int8_t *) + m0->m_len;
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
case IEEE80211_FC0_SUBTYPE_BEACON: {
u_int8_t *tstamp, *country;
u_int8_t chan, bchan, fhindex, erp;
u_int16_t capinfo, bintval, timoff;
u_int16_t fhdwell;
/*
* 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), or
* o adhoc mode (to discover neighbors)
* Frames otherwise received are discarded.
*/
if (!((ic->ic_flags & IEEE80211_F_SCAN) ||
(ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd) ||
ic->ic_opmode == IEEE80211_M_IBSS)) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
/*
* beacon/probe response frame format
* [8] time stamp
* [2] beacon interval
* [2] capability information
* [tlv] ssid
* [tlv] supported rates
* [tlv] country information
* [tlv] parameter set (FH/DS)
* [tlv] erp information
* [tlv] extended supported rates
* [tlv] WME
* [tlv] WPA or RSN
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 12);
tstamp = frm; frm += 8;
bintval = le16toh(*(u_int16_t *)frm); frm += 2;
capinfo = le16toh(*(u_int16_t *)frm); frm += 2;
ssid = rates = xrates = country = wpa = wme = NULL;
bchan = ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan);
chan = bchan;
fhdwell = 0;
fhindex = 0;
erp = 0;
timoff = 0;
while (frm < efrm) {
switch (*frm) {
case IEEE80211_ELEMID_SSID:
ssid = frm;
break;
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_COUNTRY:
country = frm;
break;
case IEEE80211_ELEMID_FHPARMS:
if (ic->ic_phytype == IEEE80211_T_FH) {
fhdwell = LE_READ_2(&frm[2]);
chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
fhindex = frm[6];
}
break;
case IEEE80211_ELEMID_DSPARMS:
/*
* XXX hack this since depending on phytype
* is problematic for multi-mode devices.
*/
if (ic->ic_phytype != IEEE80211_T_FH)
chan = frm[2];
break;
case IEEE80211_ELEMID_TIM:
/* XXX ATIM? */
timoff = frm - mtod(m0, u_int8_t *);
break;
case IEEE80211_ELEMID_IBSSPARMS:
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
case IEEE80211_ELEMID_ERP:
if (frm[1] != 1) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID, wh, "ERP",
"bad len %u", frm[1]);
ic->ic_stats.is_rx_elem_toobig++;
break;
}
erp = frm[2];
break;
case IEEE80211_ELEMID_RSN:
wpa = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(frm))
wpa = frm;
else if (iswmeparam(frm) || iswmeinfo(frm))
wme = frm;
/* XXX Atheros OUI support */
break;
default:
IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID,
wh, "unhandled",
"id %u, len %u", *frm, frm[1]);
ic->ic_stats.is_rx_elem_unknown++;
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
if (
#if IEEE80211_CHAN_MAX < 255
chan > IEEE80211_CHAN_MAX ||
#endif
isclr(ic->ic_chan_active, chan)) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"invalid channel %u", chan);
ic->ic_stats.is_rx_badchan++;
return;
}
if (chan != bchan && ic->ic_phytype != IEEE80211_T_FH) {
/*
* Frame was received on a channel different from the
* one indicated in the DS params element id;
* silently discard it.
*
* NB: this can happen due to signal leakage.
* But we should take it for FH phy because
* the rssi value should be correct even for
* different hop pattern in FH.
*/
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"for off-channel %u", chan);
ic->ic_stats.is_rx_chanmismatch++;
return;
}
/*
* Count frame now that we know it's to be processed.
*/
if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
ic->ic_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 (ic->ic_opmode == IEEE80211_M_STA &&
ni->ni_associd != 0 &&
((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
if (ni->ni_erp != erp) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] erp change: was 0x%x, now 0x%x\n",
ether_sprintf(wh->i_addr2),
ni->ni_erp, erp);
if (erp & IEEE80211_ERP_USE_PROTECTION)
ic->ic_flags |= IEEE80211_F_USEPROT;
else
ic->ic_flags &= ~IEEE80211_F_USEPROT;
ni->ni_erp = erp;
/* XXX statistic */
}
if ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] capabilities change: before 0x%x,"
" now 0x%x\n",
ether_sprintf(wh->i_addr2),
ni->ni_capinfo, capinfo);
/*
* NB: we assume short preamble doesn't
* change dynamically
*/
ieee80211_set_shortslottime(ic,
ic->ic_curmode == IEEE80211_MODE_11A ||
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
ni->ni_capinfo = capinfo;
/* XXX statistic */
}
if (wme != NULL &&
ieee80211_parse_wmeparams(ic, wme, wh) > 0)
ieee80211_wme_updateparams(ic);
/* NB: don't need the rest of this */
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0)
return;
}
if (ni == ic->ic_bss) {
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(ic))
dump_probe_beacon(subtype, 1,
wh->i_addr2, chan, bchan, capinfo,
bintval, erp, ssid, country);
#endif
/*
* Create a new entry. If scanning the entry goes
* in the scan cache. Otherwise, be particular when
* operating in adhoc mode--only take nodes marked
* as ibss participants so we don't populate our
* neighbor table with unintersting sta's.
*/
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
if ((capinfo & IEEE80211_CAPINFO_IBSS) == 0)
return;
ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta,
wh->i_addr2);
} else
ni = ieee80211_dup_bss(&ic->ic_scan, wh->i_addr2);
if (ni == NULL)
return;
ni->ni_esslen = ssid[1];
memset(ni->ni_essid, 0, sizeof(ni->ni_essid));
memcpy(ni->ni_essid, ssid + 2, ssid[1]);
} else if (ssid[1] != 0 &&
(ISPROBE(subtype) || ni->ni_esslen == 0)) {
/*
* Update ESSID at probe response to adopt
* hidden AP by Lucent/Cisco, which announces
* null ESSID in beacon.
*/
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_scan(ic) ||
ieee80211_msg_debug(ic))
dump_probe_beacon(subtype, 0,
wh->i_addr2, chan, bchan, capinfo,
bintval, erp, ssid, country);
#endif
ni->ni_esslen = ssid[1];
memset(ni->ni_essid, 0, sizeof(ni->ni_essid));
memcpy(ni->ni_essid, ssid + 2, ssid[1]);
}
ni->ni_scangen = ic->ic_scan.nt_scangen;
IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
memcpy(ni->ni_tstamp.data, tstamp, sizeof(ni->ni_tstamp));
ni->ni_intval = bintval;
ni->ni_capinfo = capinfo;
ni->ni_chan = &ic->ic_channels[chan];
ni->ni_fhdwell = fhdwell;
ni->ni_fhindex = fhindex;
ni->ni_erp = erp;
/*
* Record the byte offset from the mac header to
* the start of the TIM information element for
* use by hardware and/or to speedup software
* processing of beacon frames.
*/
ni->ni_timoff = timoff;
/*
* Record optional information elements that might be
* used by applications or drivers.
*/
if (wme != NULL)
ieee80211_saveie(&ni->ni_wme_ie, wme);
if (wpa != NULL)
ieee80211_saveie(&ni->ni_wpa_ie, wpa);
/* NB: must be after ni_chan is setup */
ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT);
break;
}
case IEEE80211_FC0_SUBTYPE_PROBE_REQ: {
u_int8_t rate;
if (ic->ic_opmode == IEEE80211_M_STA ||
ic->ic_state != IEEE80211_S_RUN) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
/* frame must be directed */
ic->ic_stats.is_rx_mgtdiscard++; /* XXX stat */
return;
}
/*
* prreq frame format
* [tlv] ssid
* [tlv] supported rates
* [tlv] extended supported rates
*/
ssid = rates = xrates = NULL;
while (frm < efrm) {
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);
IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
IEEE80211_VERIFY_SSID(ic->ic_bss, ssid);
if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "no ssid with ssid suppression enabled");
ic->ic_stats.is_rx_ssidmismatch++; /*XXX*/
return;
}
if (ni == ic->ic_bss) {
if (ic->ic_opmode == IEEE80211_M_IBSS) {
/*
* XXX Cannot tell if the sender is operating
* in ibss mode. But we need a new node to
* send the response so blindly add them to the
* neighbor table.
*/
ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta,
wh->i_addr2);
} else
ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);
if (ni == NULL)
return;
allocbs = 1;
} else
allocbs = 0;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] recv probe req\n", ether_sprintf(wh->i_addr2));
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
rate = ieee80211_setup_rates(ic, ni, rates, xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE
| IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (rate & IEEE80211_RATE_BASIC) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_XRATE,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "recv'd rate set invalid");
} else {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0);
}
if (allocbs && ic->ic_opmode != IEEE80211_M_IBSS) {
/* reclaim immediately */
ieee80211_free_node(ni);
}
break;
}
case IEEE80211_FC0_SUBTYPE_AUTH: {
u_int16_t algo, seq, status;
/*
* auth frame format
* [2] algorithm
* [2] sequence
* [2] status
* [tlv*] challenge
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 6);
algo = le16toh(*(u_int16_t *)frm);
seq = le16toh(*(u_int16_t *)(frm + 2));
status = le16toh(*(u_int16_t *)(frm + 4));
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
"[%s] recv auth frame with algorithm %d seq %d\n",
ether_sprintf(wh->i_addr2), algo, seq);
/*
* Consult the ACL policy module if setup.
*/
if (ic->ic_acl != NULL &&
!ic->ic_acl->iac_check(ic, wh->i_addr2)) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_ACL,
wh, "auth", "%s", "disallowed by ACL");
ic->ic_stats.is_rx_acl++;
return;
}
if (ic->ic_flags & IEEE80211_F_COUNTERM) {
IEEE80211_DISCARD(ic,
IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
wh, "auth", "%s", "TKIP countermeasures enabled");
ic->ic_stats.is_rx_auth_countermeasures++;
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH,
IEEE80211_REASON_MIC_FAILURE);
}
return;
}
if (algo == IEEE80211_AUTH_ALG_SHARED)
ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi,
rstamp, seq, status);
else if (algo == IEEE80211_AUTH_ALG_OPEN)
ieee80211_auth_open(ic, wh, ni, rssi, rstamp, seq,
status);
else {
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
wh, "auth", "unsupported alg %d", algo);
ic->ic_stats.is_rx_auth_unsupported++;
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
/* XXX not right */
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq+1) | (IEEE80211_STATUS_ALG<<16));
}
return;
}
break;
}
case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
u_int16_t capinfo, bintval;
struct ieee80211_rsnparms rsn;
u_int8_t reason;
if (ic->ic_opmode != IEEE80211_M_HOSTAP ||
ic->ic_state != IEEE80211_S_RUN) {
ic->ic_stats.is_rx_mgtdiscard++;
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;
}
/*
* 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
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4));
if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "wrong bssid");
ic->ic_stats.is_rx_assoc_bss++;
return;
}
capinfo = le16toh(*(u_int16_t *)frm); frm += 2;
bintval = le16toh(*(u_int16_t *)frm); frm += 2;
if (reassoc)
frm += 6; /* ignore current AP info */
ssid = rates = xrates = wpa = wme = NULL;
while (frm < efrm) {
switch (*frm) {
case IEEE80211_ELEMID_SSID:
ssid = frm;
break;
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
/* XXX verify only one of RSN and WPA ie's? */
case IEEE80211_ELEMID_RSN:
wpa = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(frm)) {
if (ic->ic_flags & IEEE80211_F_WPA1)
wpa = frm;
} else if (iswmeinfo(frm))
wme = frm;
/* XXX Atheros OUI support */
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
IEEE80211_VERIFY_SSID(ic->ic_bss, ssid);
if (ni == ic->ic_bss) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] deny %s request, sta not authenticated\n",
ether_sprintf(wh->i_addr2),
reassoc ? "reassoc" : "assoc");
ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);
if (ni != NULL) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_ASSOC_NOT_AUTHED);
ieee80211_free_node(ni);
}
ic->ic_stats.is_rx_assoc_notauth++;
return;
}
/* assert right associstion security credentials */
if (wpa == NULL && (ic->ic_flags & IEEE80211_F_WPA)) {
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
"[%s] no WPA/RSN IE in association request\n",
ether_sprintf(wh->i_addr2));
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_RSN_REQUIRED);
ieee80211_node_leave(ic, ni);
/* XXX distinguish WPA/RSN? */
ic->ic_stats.is_rx_assoc_badwpaie++;
return;
}
if (wpa != NULL) {
/*
* Parse WPA information element. Note that
* we initialize the param block from the node
* state so that information in the IE overrides
* our defaults. The resulting parameters are
* installed below after the association is assured.
*/
rsn = ni->ni_rsn;
if (wpa[0] != IEEE80211_ELEMID_RSN)
reason = ieee80211_parse_wpa(ic, wpa, &rsn, wh);
else
reason = ieee80211_parse_rsn(ic, wpa, &rsn, wh);
if (reason != 0) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH, reason);
ieee80211_node_leave(ic, ni);
/* XXX distinguish WPA/RSN? */
ic->ic_stats.is_rx_assoc_badwpaie++;
return;
}
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
"[%s] %s ie: mc %u/%u uc %u/%u key %u caps 0x%x\n",
ether_sprintf(wh->i_addr2),
wpa[0] != IEEE80211_ELEMID_RSN ? "WPA" : "RSN",
rsn.rsn_mcastcipher, rsn.rsn_mcastkeylen,
rsn.rsn_ucastcipher, rsn.rsn_ucastkeylen,
rsn.rsn_keymgmt, rsn.rsn_caps);
}
/* discard challenge after association */
if (ni->ni_challenge != NULL) {
FREE(ni->ni_challenge, M_DEVBUF);
ni->ni_challenge = NULL;
}
/* XXX some stations use the privacy bit for handling APs
that suport both encrypted and unencrypted traffic */
/* NB: PRIVACY flag bits are assumed to match */
if ((capinfo & IEEE80211_CAPINFO_ESS) == 0 ||
(capinfo & IEEE80211_CAPINFO_PRIVACY) ^
(ic->ic_flags & IEEE80211_F_PRIVACY)) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] deny %s request, capability mismatch 0x%x\n",
ether_sprintf(wh->i_addr2),
reassoc ? "reassoc" : "assoc", capinfo);
IEEE80211_SEND_MGMT(ic, ni, resp,
IEEE80211_STATUS_CAPINFO);
ieee80211_node_leave(ic, ni);
ic->ic_stats.is_rx_assoc_capmismatch++;
return;
}
ieee80211_setup_rates(ic, ni, rates, xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (ni->ni_rates.rs_nrates == 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] deny %s request, rate set mismatch\n",
ether_sprintf(wh->i_addr2),
reassoc ? "reassoc" : "assoc");
IEEE80211_SEND_MGMT(ic, ni, resp,
IEEE80211_STATUS_BASIC_RATE);
ieee80211_node_leave(ic, ni);
ic->ic_stats.is_rx_assoc_norate++;
return;
}
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
ni->ni_intval = bintval;
ni->ni_capinfo = capinfo;
ni->ni_chan = ic->ic_bss->ni_chan;
ni->ni_fhdwell = ic->ic_bss->ni_fhdwell;
ni->ni_fhindex = ic->ic_bss->ni_fhindex;
if (wpa != NULL) {
/*
* Record WPA/RSN parameters for station, mark
* node as using WPA and record information element
* for applications that require it.
*/
ni->ni_rsn = rsn;
ieee80211_saveie(&ni->ni_wpa_ie, wpa);
} else if (ni->ni_wpa_ie != NULL) {
/*
* Flush any state from a previous association.
*/
FREE(ni->ni_wpa_ie, M_DEVBUF);
ni->ni_wpa_ie = NULL;
}
if (wme != NULL) {
/*
* Record WME parameters for station, mark node
* as capable of QoS and record information
* element for applications that require it.
*/
ieee80211_saveie(&ni->ni_wme_ie, wme);
ni->ni_flags |= IEEE80211_NODE_QOS;
} else if (ni->ni_wme_ie != NULL) {
/*
* Flush any state from a previous association.
*/
FREE(ni->ni_wme_ie, M_DEVBUF);
ni->ni_wme_ie = NULL;
ni->ni_flags &= ~IEEE80211_NODE_QOS;
}
ieee80211_node_join(ic, ni, resp);
break;
}
case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
u_int16_t capinfo, associd;
u_int16_t status;
if (ic->ic_opmode != IEEE80211_M_STA ||
ic->ic_state != IEEE80211_S_ASSOC) {
ic->ic_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
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 6);
ni = ic->ic_bss;
capinfo = le16toh(*(u_int16_t *)frm);
frm += 2;
status = le16toh(*(u_int16_t *)frm);
frm += 2;
if (status != 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] %sassoc failed (reason %d)\n",
ether_sprintf(wh->i_addr2),
ISREASSOC(subtype) ? "re" : "", status);
if (ni != ic->ic_bss) /* XXX never true? */
ni->ni_fails++;
ic->ic_stats.is_rx_auth_fail++; /* XXX */
return;
}
associd = le16toh(*(u_int16_t *)frm);
frm += 2;
rates = xrates = wpa = wme = NULL;
while (frm < efrm) {
switch (*frm) {
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswmeoui(frm))
wme = frm;
/* XXX Atheros OUI support */
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
ieee80211_setup_rates(ic, ni, rates, xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (ni->ni_rates.rs_nrates == 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] %sassoc failed (rate set mismatch)\n",
ether_sprintf(wh->i_addr2),
ISREASSOC(subtype) ? "re" : "");
if (ni != ic->ic_bss) /* XXX never true? */
ni->ni_fails++;
ic->ic_stats.is_rx_assoc_norate++;
return;
}
ni->ni_capinfo = capinfo;
ni->ni_associd = associd;
if (wme != NULL &&
ieee80211_parse_wmeparams(ic, wme, wh) >= 0) {
ni->ni_flags |= IEEE80211_NODE_QOS;
ieee80211_wme_updateparams(ic);
} else
ni->ni_flags &= ~IEEE80211_NODE_QOS;
/*
* Configure state now that we are associated.
*
* XXX may need different/additional driver callbacks?
*/
if (ic->ic_curmode == IEEE80211_MODE_11A ||
(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,
ic->ic_curmode == IEEE80211_MODE_11A ||
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
/*
* Honor ERP protection.
*
* NB: ni_erp should zero for non-11g operation.
* XXX check ic_curmode anyway?
*/
if (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)
ic->ic_flags |= IEEE80211_F_USEPROT;
else
ic->ic_flags &= ~IEEE80211_F_USEPROT;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] %sassoc success: %s preamble, %s slot time%s%s\n",
ether_sprintf(wh->i_addr2),
ISREASSOC(subtype) ? "re" : "",
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" : ""
);
ieee80211_new_state(ic, IEEE80211_S_RUN, subtype);
break;
}
case IEEE80211_FC0_SUBTYPE_DEAUTH: {
u_int16_t reason;
if (ic->ic_state == IEEE80211_S_SCAN) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
/*
* deauth frame format
* [2] reason
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 2);
reason = le16toh(*(u_int16_t *)frm);
ic->ic_stats.is_rx_deauth++;
IEEE80211_NODE_STAT(ni, rx_deauth);
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
ieee80211_new_state(ic, IEEE80211_S_AUTH,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
break;
case IEEE80211_M_HOSTAP:
if (ni != ic->ic_bss) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
"station %s deauthenticated by peer "
"(reason %d)\n",
ether_sprintf(ni->ni_macaddr), reason);
ieee80211_node_leave(ic, ni);
}
break;
default:
ic->ic_stats.is_rx_mgtdiscard++;
break;
}
break;
}
case IEEE80211_FC0_SUBTYPE_DISASSOC: {
u_int16_t reason;
if (ic->ic_state != IEEE80211_S_RUN &&
ic->ic_state != IEEE80211_S_AUTH) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
/*
* disassoc frame format
* [2] reason
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 2);
reason = le16toh(*(u_int16_t *)frm);
ic->ic_stats.is_rx_disassoc++;
IEEE80211_NODE_STAT(ni, rx_disassoc);
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
ieee80211_new_state(ic, IEEE80211_S_ASSOC,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
break;
case IEEE80211_M_HOSTAP:
if (ni != ic->ic_bss) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] sta disassociated by peer (reason %d)\n",
ether_sprintf(ni->ni_macaddr), reason);
ieee80211_node_leave(ic, ni);
}
break;
default:
ic->ic_stats.is_rx_mgtdiscard++;
break;
}
break;
}
default:
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
wh, "mgt", "subtype 0x%x not handled", subtype);
ic->ic_stats.is_rx_badsubtype++;
break;
}
#undef ISREASSOC
#undef ISPROBE
}
#undef IEEE80211_VERIFY_LENGTH
#undef IEEE80211_VERIFY_ELEMENT
/*
* Handle station power-save state change.
*/
static void
ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
{
struct ieee80211com *ic = ni->ni_ic;
struct mbuf *m;
if (enable) {
if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
ic->ic_ps_sta++;
ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] power save mode on, %u sta's in ps mode\n",
ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta);
return;
}
if (ni->ni_flags & IEEE80211_NODE_PWR_MGT)
ic->ic_ps_sta--;
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] power save mode off, %u sta's in ps mode\n",
ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta);
/* XXX if no stations in ps mode, flush mc frames */
/*
* Flush queued unicast frames.
*/
if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) {
ic->ic_set_tim(ic, ni, 0); /* just in case */
return;
}
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] flush ps queue, %u packets queued\n",
ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_SAVEQ_QLEN(ni));
for (;;) {
int qlen;
IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen);
if (m == NULL)
break;
/*
* If this is the last packet, turn off the TIM bit.
* If there are more packets, set the more packets bit
* in the packet dispatched to the station.
*/
if (qlen != 0) {
struct ieee80211_frame_min *wh =
mtod(m, struct ieee80211_frame_min *);
wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
}
/* XXX need different driver interface */
/* XXX bypasses q max */
IF_ENQUEUE(&ic->ic_ifp->if_snd, m);
}
}
/*
* Process a received ps-poll frame.
*/
static void
ieee80211_recv_pspoll(struct ieee80211com *ic,
struct ieee80211_node *ni, struct mbuf *m0)
{
struct ieee80211_frame_min *wh;
struct mbuf *m;
u_int16_t aid;
int qlen;
wh = mtod(m0, struct ieee80211_frame_min *);
if (ni->ni_associd == 0) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
(struct ieee80211_frame *) wh, "ps-poll",
"%s", "unassociated station");
ic->ic_stats.is_ps_unassoc++;
IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_NOT_ASSOCED);
return;
}
aid = le16toh(*(u_int16_t *)wh->i_dur);
if (aid != ni->ni_associd) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
(struct ieee80211_frame *) wh, "ps-poll",
"aid mismatch: sta aid 0x%x poll aid 0x%x",
ni->ni_associd, aid);
ic->ic_stats.is_ps_badaid++;
IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_NOT_ASSOCED);
return;
}
/* Okay, take the first queued packet and put it out... */
IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen);
if (m == NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] recv ps-poll, but queue empty\n",
ether_sprintf(wh->i_addr2));
ieee80211_send_nulldata(ic, ni);
ic->ic_stats.is_ps_qempty++; /* XXX node stat */
ic->ic_set_tim(ic, 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_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] recv ps-poll, send packet, %u still queued\n",
ether_sprintf(ni->ni_macaddr), qlen);
wh = mtod(m, struct ieee80211_frame_min *);
wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
} else {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] recv ps-poll, send packet, queue empty\n",
ether_sprintf(ni->ni_macaddr));
ic->ic_set_tim(ic, ni, 0);
}
m->m_flags |= M_PWR_SAV; /* bypass PS handling */
IF_ENQUEUE(&ic->ic_ifp->if_snd, m);
}
#ifdef IEEE80211_DEBUG
/*
* Debugging support.
*/
/*
* Return the bssid of a frame.
*/
static const u_int8_t *
ieee80211_getbssid(struct ieee80211com *ic, const struct ieee80211_frame *wh)
{
if (ic->ic_opmode == IEEE80211_M_STA)
return wh->i_addr2;
if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
return wh->i_addr1;
if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
return wh->i_addr1;
return wh->i_addr3;
}
static void
ieee80211_discard_frame(struct ieee80211com *ic,
const struct ieee80211_frame *wh,
const char *type, const char *fmt, ...)
{
va_list ap;
printf("[%s] discard ", ether_sprintf(ieee80211_getbssid(ic, wh)));
if (type != NULL)
printf(" %s frame, ", type);
else
printf(" frame, ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
static void
ieee80211_discard_ie(struct ieee80211com *ic,
const struct ieee80211_frame *wh,
const char *type, const char *fmt, ...)
{
va_list ap;
printf("[%s] discard ", ether_sprintf(ieee80211_getbssid(ic, wh)));
if (type != NULL)
printf(" %s information element, ", type);
else
printf(" information element, ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
static void
ieee80211_discard_mac(struct ieee80211com *ic,
const u_int8_t mac[IEEE80211_ADDR_LEN],
const char *type, const char *fmt, ...)
{
va_list ap;
printf("[%s] discard ", ether_sprintf(mac));
if (type != NULL)
printf(" %s frame, ", type);
else
printf(" frame, ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
#endif /* IEEE80211_DEBUG */
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