new 802.11 layer:

o code reorg (relative to old netbsd-derived code) for future growth
o drivers now specify available channels and rates and 802.11 layer handles
  almost all ifmedia actions
o multi-mode support for 11a/b/g devices
o 11g protocol additions (incomplete)
o new element id additions (for other than 11g)
o node/station table redone for proper locking and to eliminate driver
  incestuousness
o split device flags and capabilities to reduce confusion and provide room
  for expansion
o incomplete power management infrastructure (need to revisit)
o incomplete hooks for software retry
o more...

1 files changed, 1093 insertions, 0 deletions

diff --git a/sys/net80211/ieee80211_input.c b/sys/net80211/ieee80211_input.c
new file mode 100644
index 000000000000..d232c94efa0c
--- /dev/null
+++ b/sys/net80211/ieee80211_input.c
@@ -0,0 +1,1093 @@
+/*-
+ * Copyright (c) 2002, 2003 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,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ *    similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
+ *    redistribution must be conditioned upon including a substantially
+ *    similar Disclaimer requirement for further binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ *    of any contributors may 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.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
+ * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_inet.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/bus.h>
+#include <sys/proc.h>
+#include <sys/sysctl.h>
+
+#include <machine/atomic.h>
+ 
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+#include <net/if_llc.h>
+
+#include <net80211/ieee80211_var.h>
+
+#include <net/bpf.h>
+
+#ifdef INET
+#include <netinet/in.h> 
+#include <netinet/if_ether.h>
+#endif
+
+void
+ieee80211_input(struct ifnet *ifp, struct mbuf *m,
+	int rssi, u_int32_t rstamp, u_int rantenna)
+{
+	struct ieee80211com *ic = (void *)ifp;
+	struct ieee80211_node *ni = NULL;
+	struct ieee80211_frame *wh;
+	struct ether_header *eh;
+	struct mbuf *m1;
+	int len;
+	u_int8_t dir, subtype;
+	u_int8_t *bssid;
+	u_int16_t rxseq;
+
+	/* trim CRC here for 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;
+	}
+
+	wh = mtod(m, struct ieee80211_frame *);
+	if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
+	    IEEE80211_FC0_VERSION_0) {
+		if (ifp->if_flags & IFF_DEBUG)
+			if_printf(ifp, "receive packet with wrong version: %x\n",
+			    wh->i_fc[0]);
+		goto err;
+	}
+
+	dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
+
+	if (ic->ic_state != IEEE80211_S_SCAN) {
+		switch (ic->ic_opmode) {
+		case IEEE80211_M_STA:
+			ni = ieee80211_ref_node(ic->ic_bss);
+			if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) {
+				IEEE80211_DPRINTF2(("%s: discard frame from "
+					"bss %s\n", __func__,
+					ether_sprintf(wh->i_addr2)));
+				/* not interested in */
+				ieee80211_unref_node(&ni);
+				goto out;
+			}
+			break;
+		case IEEE80211_M_IBSS:
+		case IEEE80211_M_AHDEMO:
+		case IEEE80211_M_HOSTAP:
+			if (dir == IEEE80211_FC1_DIR_NODS)
+				bssid = wh->i_addr3;
+			else
+				bssid = wh->i_addr1;
+			if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) &&
+			    !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
+				/* not interested in */
+				IEEE80211_DPRINTF2(("%s: other bss %s\n",
+					__func__, ether_sprintf(wh->i_addr3)));
+				goto out;
+			}
+			ni = ieee80211_find_node(ic, wh->i_addr2);
+			if (ni == NULL) {
+				IEEE80211_DPRINTF2(("%s: warning, unknown src "
+					"%s\n", __func__,
+					ether_sprintf(wh->i_addr2)));
+				/*
+				 * NB: Node allocation is handled in the
+				 * management handling routines.  Just fake
+				 * up a reference to the hosts's node to do
+				 * the stuff below.
+				 */
+				ni = ieee80211_ref_node(ic->ic_bss);
+			}
+			break;
+		default:
+			/* XXX catch bad values */
+			break;
+		}
+		ni->ni_rssi = rssi;
+		ni->ni_rstamp = rstamp;
+		ni->ni_rantenna = rantenna;
+		rxseq = ni->ni_rxseq;
+		ni->ni_rxseq =
+		    le16toh(*(u_int16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
+		/* TODO: fragment */
+		if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
+		    rxseq == ni->ni_rxseq) {
+			/* duplicate, silently discarded */
+			ieee80211_unref_node(&ni);
+			goto out;
+		}
+		ni->ni_inact = 0;
+		ieee80211_unref_node(&ni);
+	}
+
+	switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
+	case IEEE80211_FC0_TYPE_DATA:
+		switch (ic->ic_opmode) {
+		case IEEE80211_M_STA:
+			if (dir != IEEE80211_FC1_DIR_FROMDS)
+				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.
+				 */
+				goto out;
+			}
+			break;
+		case IEEE80211_M_IBSS:
+		case IEEE80211_M_AHDEMO:
+			if (dir != IEEE80211_FC1_DIR_NODS)
+				goto out;
+			break;
+		case IEEE80211_M_HOSTAP:
+			if (dir != IEEE80211_FC1_DIR_TODS)
+				goto out;
+			/* check if source STA is associated */
+			ni = ieee80211_find_node(ic, wh->i_addr2);
+			if (ni == NULL) {
+				IEEE80211_DPRINTF(("%s: data from unknown src "
+					"%s\n", __func__,
+					ether_sprintf(wh->i_addr2)));
+				ni = ieee80211_dup_bss(ic, wh->i_addr2);
+				if (ni != NULL) {
+					IEEE80211_SEND_MGMT(ic, ni,
+					    IEEE80211_FC0_SUBTYPE_DEAUTH,
+					    IEEE80211_REASON_NOT_AUTHED);
+					ieee80211_free_node(ic, ni);
+				}
+				goto err;
+			}
+			if (ni->ni_associd == 0) {
+				IEEE80211_DPRINTF(("ieee80211_input: "
+				    "data from unassoc src %s\n",
+				    ether_sprintf(wh->i_addr2)));
+				IEEE80211_SEND_MGMT(ic, ni,
+				    IEEE80211_FC0_SUBTYPE_DISASSOC,
+				    IEEE80211_REASON_NOT_ASSOCED);
+				ieee80211_unref_node(&ni);
+				goto err;
+			}
+			ieee80211_unref_node(&ni);
+			break;
+		}
+		if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
+			if (ic->ic_flags & IEEE80211_F_WEPON) {
+				m = ieee80211_wep_crypt(ifp, m, 0);
+				if (m == NULL)
+					goto err;
+				wh = mtod(m, struct ieee80211_frame *);
+			} else
+				goto out;
+		}
+		/* copy to listener after decrypt */
+#if NBPFILTER > 0
+		if (ic->ic_rawbpf)
+			bpf_mtap(ic->ic_rawbpf, m);
+#endif
+		m = ieee80211_decap(ifp, m);
+		if (m == NULL)
+			goto err;
+		ifp->if_ipackets++;
+
+		/* perform as a bridge within the AP */
+		m1 = NULL;
+		if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
+			eh = mtod(m, struct ether_header *);
+			if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
+				m1 = m_copym(m, 0, M_COPYALL, M_DONTWAIT);
+				if (m1 == NULL)
+					ifp->if_oerrors++;
+				else
+					m1->m_flags |= M_MCAST;
+			} else {
+				ni = ieee80211_find_node(ic, eh->ether_dhost);
+				if (ni != NULL) {
+					if (ni->ni_associd != 0) {
+						m1 = m;
+						m = NULL;
+					}
+					ieee80211_unref_node(&ni);
+				}
+			}
+			if (m1 != NULL) {
+#ifdef ALTQ
+				if (ALTQ_IS_ENABLED(&ifp->if_snd))
+					altq_etherclassify(&ifp->if_snd, m1,
+					    &pktattr);
+#endif
+				len = m1->m_pkthdr.len;
+				IF_ENQUEUE(&ifp->if_snd, m1);
+				if (m != NULL)
+					ifp->if_omcasts++;
+				ifp->if_obytes += len;
+			}
+		}
+		if (m != NULL)
+			(*ifp->if_input)(ifp, m);
+		return;
+
+	case IEEE80211_FC0_TYPE_MGT:
+		if (dir != IEEE80211_FC1_DIR_NODS)
+			goto err;
+		if (ic->ic_opmode == IEEE80211_M_AHDEMO)
+			goto out;
+		subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
+
+		/* drop frames without interest */
+		if (ic->ic_state == IEEE80211_S_SCAN) {
+			if (subtype != IEEE80211_FC0_SUBTYPE_BEACON &&
+			    subtype != IEEE80211_FC0_SUBTYPE_PROBE_RESP)
+				goto out;
+		} else {
+			if (ic->ic_opmode != IEEE80211_M_IBSS &&
+			    subtype == IEEE80211_FC0_SUBTYPE_BEACON)
+				goto out;
+		}
+
+		if (ifp->if_flags & IFF_DEBUG) {
+			/* avoid to print too many frames */
+			int doprint = 0;
+
+			switch (subtype) {
+			case IEEE80211_FC0_SUBTYPE_BEACON:
+				if (ic->ic_state == IEEE80211_S_SCAN)
+					doprint = 1;
+				break;
+			case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
+				if (ic->ic_opmode == IEEE80211_M_IBSS)
+					doprint = 1;
+				break;
+			default:
+				doprint = 1;
+				break;
+			}
+#ifdef IEEE80211_DEBUG
+			doprint += ieee80211_debug;
+#endif
+			if (doprint)
+				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);
+		}
+#if NBPFILTER > 0
+		if (ic->ic_rawbpf)
+			bpf_mtap(ic->ic_rawbpf, m);
+#endif
+		(*ic->ic_recv_mgmt)(ic, m, subtype, rssi, rstamp, rantenna);
+		m_freem(m);
+		return;
+
+	case IEEE80211_FC0_TYPE_CTL:
+	default:
+		IEEE80211_DPRINTF(("%s: bad type %x\n", __func__, wh->i_fc[0]));
+		/* should not come here */
+		break;
+	}
+  err:
+	ifp->if_ierrors++;
+  out:
+	if (m != NULL) {
+#if NBPFILTER > 0
+		if (ic->ic_rawbpf)
+			bpf_mtap(ic->ic_rawbpf, m);
+#endif
+		m_freem(m);
+	}
+}
+
+struct mbuf *
+ieee80211_decap(struct ifnet *ifp, struct mbuf *m)
+{
+	struct ether_header *eh;
+	struct ieee80211_frame wh;
+	struct llc *llc;
+
+	if (m->m_len < sizeof(wh) + sizeof(*llc)) {
+		m = m_pullup(m, sizeof(wh) + sizeof(*llc));
+		if (m == NULL)
+			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_DPRINTF(("%s: DS to DS\n", __func__));
+		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(("%s: extended rate set too large;"
+				" only using %u of %u rates\n",
+				__func__, nxrates, xrates[1]));
+		}
+		memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
+		rs->rs_nrates += nxrates;
+	}
+	return ieee80211_fix_rate(ic, ni, flags);
+}
+
+/* XXX statistics */
+/* Verify the existence and length of __elem or get out. */
+#define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do {			\
+	if ((__elem) == NULL) {						\
+		IEEE80211_DPRINTF(("%s: no " #__elem "in %s frame\n",	\
+			__func__, ieee80211_mgt_subtype_name[subtype >>	\
+				IEEE80211_FC0_SUBTYPE_SHIFT]));		\
+		return;							\
+	}								\
+	if ((__elem)[1] > (__maxlen)) {					\
+		IEEE80211_DPRINTF(("%s: bad " #__elem " len %d in %s "	\
+			"frame from %s\n", __func__, (__elem)[1],	\
+			ieee80211_mgt_subtype_name[subtype >>		\
+				IEEE80211_FC0_SUBTYPE_SHIFT],		\
+			ether_sprintf(wh->i_addr2)));			\
+		return;							\
+	}								\
+} while (0)
+
+#define	IEEE80211_VERIFY_LENGTH(_len, _minlen) do {			\
+	if ((_len) < (_minlen)) {					\
+		IEEE80211_DPRINTF(("%s: %s frame too short from %s\n",	\
+			__func__,					\
+			ieee80211_mgt_subtype_name[subtype >>		\
+				IEEE80211_FC0_SUBTYPE_SHIFT],		\
+			ether_sprintf(wh->i_addr2)));			\
+		return;							\
+	}								\
+} while (0)
+
+void
+ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, int subtype,
+	int rssi, u_int32_t rstamp, u_int rantenna)
+{
+#define	ISPROBE(_st)	((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
+	struct ifnet *ifp = &ic->ic_if;
+	struct ieee80211_frame *wh;
+	struct ieee80211_node *ni;
+	u_int8_t *frm, *efrm;
+	u_int8_t *ssid, *rates, *xrates;
+	int reassoc, resp, newassoc, 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, *bintval, *capinfo, *country;
+		u_int8_t chan, bchan, fhindex, erp;
+		u_int16_t fhdwell;
+
+		if (ic->ic_opmode != IEEE80211_M_IBSS &&
+		    ic->ic_state != IEEE80211_S_SCAN) {
+			/* XXX: may be useful for background scan */
+			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
+		 */
+		IEEE80211_VERIFY_LENGTH(efrm - frm, 12);
+		tstamp  = frm;	frm += 8;
+		bintval = frm;	frm += 2;
+		capinfo = frm;	frm += 2;
+		ssid = rates = xrates = country = NULL;
+		bchan = ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan);
+		chan = bchan;
+		fhdwell = 0;
+		fhindex = 0;
+		erp = 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 = (frm[3] << 8) | 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:
+				break;
+			case IEEE80211_ELEMID_XRATES:
+				xrates = frm;
+				break;
+			case IEEE80211_ELEMID_ERP:
+				if (frm[1] != 1) {
+					IEEE80211_DPRINTF(("%s: invalid ERP "
+						"element; length %u, expecting "
+						"1\n", __func__, frm[1]));
+					break;
+				}
+				erp = frm[2];
+				break;
+			default:
+				IEEE80211_DPRINTF(("%s: element id %u/len %u "
+					"ignored\n", __func__, *frm, frm[1]));
+				break;
+			}
+			frm += frm[1] + 2;
+		}
+		IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_SIZE);
+		IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
+		if (chan > IEEE80211_CHAN_MAX || isclr(ic->ic_chan_active, chan)) {
+			IEEE80211_DPRINTF(("%s: ignore %s with invalid channel "
+				"%u\n", __func__,
+				ISPROBE(subtype) ? "probe response" : "beacon",
+				chan));
+			return;
+		}
+		if (chan != bchan) {
+			/*
+			 * Frame was received on a channel different from the
+			 * one indicated in the DS/FH params element id;
+			 * silently discard it.
+			 *
+			 * NB: this can happen due to signal leakage.
+			 */
+			IEEE80211_DPRINTF(("%s: ignore %s on channel %u marked "
+				"for channel %u\n", __func__,
+				ISPROBE(subtype) ? "probe response" : "beacon",
+				bchan, chan));
+			/* XXX statistic */
+			return;
+		}
+
+		/*
+		 * Use mac and channel for lookup so we collect all
+		 * potential AP's when scanning.  Otherwise we may
+		 * see the same AP on multiple channels and will only
+		 * record the last one.  We could filter APs here based
+		 * on rssi, etc. but leave that to the end of the scan
+		 * so we can keep the selection criteria in one spot.
+		 * This may result in a bloat of the scanned AP list but
+		 * it shouldn't be too much.
+		 */
+		ni = ieee80211_lookup_node(ic, wh->i_addr2,
+				&ic->ic_channels[chan]);
+#ifdef IEEE80211_DEBUG
+		if (ieee80211_debug &&
+		    (ni == NULL || ic->ic_state == IEEE80211_S_SCAN)) {
+			printf("%s: %s%s on chan %u (bss chan %u) ",
+			    __func__, (ni == NULL ? "new " : ""),
+			    ISPROBE(subtype) ? "probe response" : "beacon",
+			    chan, bchan);
+			ieee80211_print_essid(ssid + 2, ssid[1]);
+			printf(" from %s\n", ether_sprintf(wh->i_addr2));
+			printf("%s: caps 0x%x bintval %u erp 0x%x\n",
+				__func__, le16toh(*(u_int16_t *)capinfo),
+				le16toh(*(u_int16_t *)bintval), erp);
+			if (country)
+				printf("%s: country info %*D\n",
+					__func__, country[1], country+2, " ");
+		}
+#endif
+		if (ni == NULL) {
+			ni = ieee80211_alloc_node(ic, 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)) {
+			/*
+			 * Update ESSID at probe response to adopt hidden AP by
+			 * Lucent/Cisco, which announces null ESSID in beacon.
+			 */
+			ni->ni_esslen = ssid[1];
+			memset(ni->ni_essid, 0, sizeof(ni->ni_essid));
+			memcpy(ni->ni_essid, ssid + 2, ssid[1]);
+		}
+		IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
+		ni->ni_rssi = rssi;
+		ni->ni_rstamp = rstamp;
+		ni->ni_rantenna = rantenna;
+		memcpy(ni->ni_tstamp, tstamp, sizeof(ni->ni_tstamp));
+		ni->ni_intval = le16toh(*(u_int16_t *)bintval);
+		ni->ni_capinfo = le16toh(*(u_int16_t *)capinfo);
+		/* XXX validate channel # */
+		ni->ni_chan = &ic->ic_channels[chan];
+		ni->ni_fhdwell = fhdwell;
+		ni->ni_fhindex = fhindex;
+		ni->ni_erp = erp;
+		/* NB: must be after ni_chan is setup */
+		ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT);
+		ieee80211_unref_node(&ni);
+		break;
+	}
+
+	case IEEE80211_FC0_SUBTYPE_PROBE_REQ: {
+		u_int8_t rate;
+
+		if (ic->ic_opmode == IEEE80211_M_STA)
+			return;
+		if (ic->ic_state != IEEE80211_S_RUN)
+			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_SIZE);
+		IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
+		if (ssid[1] != 0 &&
+		    (ssid[1] != ic->ic_bss->ni_esslen ||
+		    memcmp(ssid + 2, ic->ic_bss->ni_essid, ic->ic_bss->ni_esslen) != 0)) {
+#ifdef IEEE80211_DEBUG
+			if (ieee80211_debug) {
+				printf("%s: ssid unmatch ", __func__);
+				ieee80211_print_essid(ssid + 2, ssid[1]);
+				printf(" from %s\n", ether_sprintf(wh->i_addr2));
+			}
+#endif
+			return;
+		}
+
+		ni = ieee80211_find_node(ic, wh->i_addr2);
+		if (ni == NULL) {
+			ni = ieee80211_dup_bss(ic, wh->i_addr2);
+			if (ni == NULL)
+				return;
+			IEEE80211_DPRINTF(("%s: new req from %s\n",
+				__func__, ether_sprintf(wh->i_addr2)));
+			allocbs = 1;
+		} else
+			allocbs = 0;
+		ni->ni_rssi = rssi;
+		ni->ni_rstamp = rstamp;
+		ni->ni_rantenna = rantenna;
+		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_DPRINTF(("%s: rate negotiation failed: %s\n",
+				__func__,ether_sprintf(wh->i_addr2)));
+		} else {
+			IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_PROBE_RESP,
+			    0);
+		}
+		if (allocbs && ic->ic_opmode == IEEE80211_M_HOSTAP)
+			ieee80211_free_node(ic, ni);
+		else
+			ieee80211_unref_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));
+		if (algo != IEEE80211_AUTH_ALG_OPEN) {
+			/* TODO: shared key auth */
+			IEEE80211_DPRINTF(("%s: unsupported auth %d from %s\n",
+				__func__, algo, ether_sprintf(wh->i_addr2)));
+			return;
+		}
+		switch (ic->ic_opmode) {
+		case IEEE80211_M_IBSS:
+			if (ic->ic_state != IEEE80211_S_RUN || seq != 1)
+				return;
+			ieee80211_new_state(&ic->ic_if, 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 != 1)
+				return;
+			allocbs = 0;
+			ni = ieee80211_find_node(ic, wh->i_addr2);
+			if (ni == NULL) {
+				ni = ieee80211_alloc_node(ic, wh->i_addr2);
+				if (ni == NULL)
+					return;
+				IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
+				ni->ni_rssi = rssi;
+				ni->ni_rstamp = rstamp;
+				ni->ni_rantenna = rantenna;
+				ni->ni_chan = ic->ic_bss->ni_chan;
+				allocbs = 1;
+			}
+			IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, 2);
+			if (ifp->if_flags & IFF_DEBUG)
+				if_printf(ifp, "station %s %s authenticated\n",
+				    (allocbs ? "newly" : "already"),
+				    ether_sprintf(ni->ni_macaddr));
+			ieee80211_unref_node(&ni);
+			break;
+
+		case IEEE80211_M_STA:
+			if (ic->ic_state != IEEE80211_S_AUTH || seq != 2)
+				return;
+			if (status != 0) {
+				if_printf(&ic->ic_if,
+				    "authentication failed (reason %d) for %s\n",
+				    status,
+				    ether_sprintf(wh->i_addr3));
+				ni = ieee80211_find_node(ic, wh->i_addr2);
+				if (ni != NULL) {
+					ni->ni_fails++;
+					ieee80211_unref_node(&ni);
+				}
+				return;
+			}
+			ieee80211_new_state(&ic->ic_if, IEEE80211_S_ASSOC,
+			    wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
+			break;
+		}
+		break;
+	}
+
+	case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
+	case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
+		u_int16_t capinfo, bintval;
+
+		if (ic->ic_opmode != IEEE80211_M_HOSTAP ||
+		    (ic->ic_state != IEEE80211_S_RUN))
+			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
+		 */
+		IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4));
+		if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) {
+			IEEE80211_DPRINTF(("%s: ignore other bss from %s\n",
+				__func__, ether_sprintf(wh->i_addr2)));
+			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 = 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_SIZE);
+		IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
+		if (ssid[1] != ic->ic_bss->ni_esslen ||
+		    memcmp(ssid + 2, ic->ic_bss->ni_essid, ssid[1]) != 0) {
+#ifdef IEEE80211_DEBUG
+			if (ieee80211_debug) {
+				printf("%s: ssid unmatch ", __func__);
+				ieee80211_print_essid(ssid + 2, ssid[1]);
+				printf(" from %s\n", ether_sprintf(wh->i_addr2));
+			}
+#endif
+			return;
+		}
+		ni = ieee80211_find_node(ic, wh->i_addr2);
+		if (ni == NULL) {
+			IEEE80211_DPRINTF(("%s: not authenticated for %s\n",
+				__func__, ether_sprintf(wh->i_addr2)));
+			ni = ieee80211_dup_bss(ic, wh->i_addr2);
+			if (ni == NULL)
+				return;
+			IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
+			    IEEE80211_REASON_ASSOC_NOT_AUTHED);
+			ieee80211_free_node(ic, ni);
+			return;
+		}
+		/* XXX per-node cipher suite */
+		/* XXX some stations use the privacy bit for handling APs
+		       that suport both encrypted and unencrypted traffic */
+		if ((capinfo & IEEE80211_CAPINFO_ESS) == 0 ||
+		    (capinfo & IEEE80211_CAPINFO_PRIVACY) !=
+		    ((ic->ic_flags & IEEE80211_F_WEPON) ?
+		     IEEE80211_CAPINFO_PRIVACY : 0)) {
+			IEEE80211_DPRINTF(("%s: capability mismatch %x for %s\n",
+				__func__, capinfo, ether_sprintf(wh->i_addr2)));
+			ni->ni_associd = 0;
+			IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_CAPINFO);
+			ieee80211_unref_node(&ni);
+			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(("%s: rate unmatch for %s\n",
+				__func__, ether_sprintf(wh->i_addr2)));
+			ni->ni_associd = 0;
+			IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_BASIC_RATE);
+			ieee80211_unref_node(&ni);
+			return;
+		}
+		ni->ni_rssi = rssi;
+		ni->ni_rstamp = rstamp;
+		ni->ni_rantenna = rantenna;
+		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 (ni->ni_associd == 0) {
+			ni->ni_associd = 0xc000 | ic->ic_bss->ni_associd++;
+			newassoc = 1;
+		} else
+			newassoc = 0;
+		/* XXX for 11g must turn off short slot time if long
+	           slot time sta associates */
+		IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS);
+		if (ifp->if_flags & IFF_DEBUG)
+			if_printf(ifp, "station %s %s associated\n",
+			    (newassoc ? "newly" : "already"),
+			    ether_sprintf(ni->ni_macaddr));
+		/* give driver a chance to setup state like ni_txrate */
+		if (ic->ic_newassoc)
+			(*ic->ic_newassoc)(ic, ni, newassoc);
+		ieee80211_unref_node(&ni);
+		break;
+	}
+
+	case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
+	case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
+		u_int16_t status;
+
+		if (ic->ic_opmode != IEEE80211_M_STA ||
+		    ic->ic_state != IEEE80211_S_ASSOC)
+			return;
+
+		/*
+		 * asresp frame format
+		 *	[2] capability information
+		 *	[2] status
+		 *	[2] association ID
+		 *	[tlv] supported rates
+		 *	[tlv] extended supported rates
+		 */
+		IEEE80211_VERIFY_LENGTH(efrm - frm, 6);
+		ni = ic->ic_bss;
+		ni->ni_capinfo = le16toh(*(u_int16_t *)frm);
+		frm += 2;
+
+		status = le16toh(*(u_int16_t *)frm);
+		frm += 2;
+		if (status != 0) {
+			if_printf(ifp, "association failed (reason %d) for %s\n",
+			    status, ether_sprintf(wh->i_addr3));
+			ni = ieee80211_find_node(ic, wh->i_addr2);
+			if (ni != NULL) {
+				ni->ni_fails++;
+				ieee80211_unref_node(&ni);
+			}
+			return;
+		}
+		ni->ni_associd = le16toh(*(u_int16_t *)frm);
+		frm += 2;
+
+		rates = xrates = NULL;
+		while (frm < efrm) {
+			switch (*frm) {
+			case IEEE80211_ELEMID_RATES:
+				rates = frm;
+				break;
+			case IEEE80211_ELEMID_XRATES:
+				xrates = frm;
+				break;
+			}
+			frm += frm[1] + 2;
+		}
+
+		IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_SIZE);
+		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_new_state(ifp, IEEE80211_S_RUN,
+				wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
+		break;
+	}
+
+	case IEEE80211_FC0_SUBTYPE_DEAUTH: {
+		u_int16_t reason;
+		/*
+		 * deauth frame format
+		 *	[2] reason
+		 */
+		IEEE80211_VERIFY_LENGTH(efrm - frm, 2);
+		reason = le16toh(*(u_int16_t *)frm);
+		switch (ic->ic_opmode) {
+		case IEEE80211_M_STA:
+			ieee80211_new_state(&ic->ic_if, IEEE80211_S_AUTH,
+			    wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
+			break;
+		case IEEE80211_M_HOSTAP:
+			ni = ieee80211_find_node(ic, wh->i_addr2);
+			if (ni != NULL) {
+				if (ifp->if_flags & IFF_DEBUG)
+					if_printf(ifp, "station %s deauthenticated"
+					    " by peer (reason %d)\n",
+					    ether_sprintf(ni->ni_macaddr), reason);
+				ieee80211_free_node(ic, ni);
+			}
+			break;
+		default:
+			break;
+		}
+		break;
+	}
+
+	case IEEE80211_FC0_SUBTYPE_DISASSOC: {
+		u_int16_t reason;
+		/*
+		 * disassoc frame format
+		 *	[2] reason
+		 */
+		IEEE80211_VERIFY_LENGTH(efrm - frm, 2);
+		reason = le16toh(*(u_int16_t *)frm);
+		switch (ic->ic_opmode) {
+		case IEEE80211_M_STA:
+			ieee80211_new_state(&ic->ic_if, IEEE80211_S_ASSOC,
+			    wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
+			break;
+		case IEEE80211_M_HOSTAP:
+			ni = ieee80211_find_node(ic, wh->i_addr2);
+			if (ni != NULL) {
+				if (ifp->if_flags & IFF_DEBUG)
+					if_printf(ifp, "station %s disassociated"
+					    " by peer (reason %d)\n",
+					    ether_sprintf(ni->ni_macaddr), reason);
+				ni->ni_associd = 0;
+				ieee80211_unref_node(&ni);
+			}
+			break;
+		default:
+			break;
+		}
+		break;
+	}
+	default:
+		IEEE80211_DPRINTF(("%s: mgmt frame with subtype 0x%x not "
+			"handled\n", __func__, subtype));
+		break;
+	}
+#undef ISPROBE
+}
+#undef IEEE80211_VERIFY_LENGTH
+#undef IEEE80211_VERIFY_ELEMENT