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freebsd-dev/sys/net80211/ieee80211_input.c
mlaier 7922e2ad84 Link ALTQ to the build and break with ABI for struct ifnet. Please recompile 
your (network) modules as well as any userland that might make sense of
sizeof(struct ifnet).
This does not change the queueing yet. These changes will follow in a
seperate commit. Same with the driver changes, which need case by case
evaluation.

__FreeBSD_version bump will follow.

Tested-by:	(i386)LINT
2004-06-13 17:29:10 +00:00

1184 lines
33 KiB
C
Raw Blame History

/*-
* Copyright (c) 2001 Atsushi Onoe
* 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.
* 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 "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
/*
* 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.
*/
void
ieee80211_input(struct ifnet *ifp, struct mbuf *m, struct ieee80211_node *ni,
int rssi, u_int32_t rstamp)
{
struct ieee80211com *ic = (void *)ifp;
struct ieee80211_frame *wh;
struct ether_header *eh;
struct mbuf *m1;
int len;
u_int8_t dir, type, subtype;
u_int8_t *bssid;
u_int16_t rxseq;
KASSERT(ni != NULL, ("null node"));
/* 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));
/*
* In monitor mode, send everything directly to bpf.
* XXX may want to include the CRC
*/
if (ic->ic_opmode == IEEE80211_M_MONITOR)
goto out;
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]);
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;
/*
* NB: We are not yet prepared to handle control frames,
* but permitting drivers to send them to us allows
* them to go through bpf tapping at the 802.11 layer.
*/
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
/* XXX statistic */
IEEE80211_DPRINTF2(("%s: frame too short, len %u\n",
__func__, m->m_pkthdr.len));
ic->ic_stats.is_rx_tooshort++;
goto out; /* XXX */
}
if (ic->ic_state != IEEE80211_S_SCAN) {
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) {
/* not interested in */
IEEE80211_DPRINTF2(("%s: discard frame from "
"bss %s\n", __func__,
ether_sprintf(wh->i_addr2)));
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_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: discard frame from "
"bss %s\n", __func__,
ether_sprintf(bssid)));
ic->ic_stats.is_rx_wrongbss++;
goto out;
}
break;
case IEEE80211_M_MONITOR:
goto out;
default:
/* XXX catch bad values */
break;
}
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
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 */
ic->ic_stats.is_rx_dup++; /* XXX per-station stat */
goto out;
}
ni->ni_inact = 0;
}
switch (type) {
case IEEE80211_FC0_TYPE_DATA:
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.
*/
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;
}
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_DPRINTF(("%s: data from unknown src "
"%s\n", __func__,
ether_sprintf(wh->i_addr2)));
/* NB: caller deals with reference */
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);
}
ic->ic_stats.is_rx_notassoc++;
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);
ic->ic_stats.is_rx_notassoc++;
goto err;
}
break;
case IEEE80211_M_MONITOR:
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) {
ic->ic_stats.is_rx_wepfail++;
goto err;
}
wh = mtod(m, struct ieee80211_frame *);
} else {
ic->ic_stats.is_rx_nowep++;
goto out;
}
}
/* copy to listener after decrypt */
if (ic->ic_rawbpf)
bpf_mtap(ic->ic_rawbpf, m);
m = ieee80211_decap(ifp, m);
if (m == NULL) {
ic->ic_stats.is_rx_decap++;
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_copypacket(m, 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_free_node(ic, ni);
}
}
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)
(*ifp->if_input)(ifp, m);
return;
case IEEE80211_FC0_TYPE_MGT:
if (dir != IEEE80211_FC1_DIR_NODS) {
ic->ic_stats.is_rx_wrongdir++;
goto err;
}
if (ic->ic_opmode == IEEE80211_M_AHDEMO) {
ic->ic_stats.is_rx_ahdemo_mgt++;
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) {
ic->ic_stats.is_rx_mgtdiscard++;
goto out;
}
} else {
if (ic->ic_opmode != IEEE80211_M_IBSS &&
subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
ic->ic_stats.is_rx_mgtdiscard++;
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 (ic->ic_rawbpf)
bpf_mtap(ic->ic_rawbpf, m);
(*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, rstamp);
m_freem(m);
return;
case IEEE80211_FC0_TYPE_CTL:
ic->ic_stats.is_rx_ctl++;
goto out;
default:
IEEE80211_DPRINTF(("%s: bad type %x\n", __func__, 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);
}
}
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]));
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);
}
/* 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])); \
ic->ic_stats.is_rx_elem_missing++; \
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))); \
ic->ic_stats.is_rx_elem_toobig++; \
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))); \
ic->ic_stats.is_rx_elem_toosmall++; \
return; \
} \
} while (0)
void
ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0,
struct ieee80211_node *ni,
int subtype, int rssi, u_int32_t rstamp)
{
struct ifnet *ifp = &ic->ic_if;
struct ieee80211_frame *wh;
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;
int isprobe;
if (ic->ic_opmode != IEEE80211_M_IBSS &&
ic->ic_state != IEEE80211_S_SCAN) {
/* XXX: may be useful for background scan */
return;
}
isprobe = (subtype == IEEE80211_FC0_SUBTYPE_PROBE_RESP);
/*
* 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_IBSSPARMS:
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]));
ic->ic_stats.is_rx_elem_toobig++;
break;
}
erp = frm[2];
break;
default:
IEEE80211_DPRINTF2(("%s: element id %u/len %u "
"ignored\n", __func__, *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_DPRINTF(("%s: ignore %s with invalid channel "
"%u\n", __func__,
isprobe ? "probe response" : "beacon",
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_DPRINTF(("%s: ignore %s on channel %u marked "
"for channel %u\n", __func__,
isprobe ? "probe response" : "beacon",
bchan, chan));
ic->ic_stats.is_rx_chanmismatch++;
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 ? "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]);
allocbs = 1;
} else if (ssid[1] != 0 && isprobe) {
/*
* 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]);
allocbs = 0;
} else
allocbs = 0;
IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
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);
/*
* When scanning we record results (nodes) with a zero
* refcnt. Otherwise we want to hold the reference for
* ibss neighbors so the nodes don't get released prematurely.
* Anything else can be discarded (XXX and should be handled
* above so we don't do so much work).
*/
if (ic->ic_state == IEEE80211_S_SCAN)
ieee80211_unref_node(&ni); /* NB: do not free */
else if (ic->ic_opmode == IEEE80211_M_IBSS &&
allocbs && isprobe) {
/*
* Fake an association so the driver can setup it's
* private state. The rate set has been setup above;
* there is no handshake as in ap/station operation.
*/
if (ic->ic_newassoc)
(*ic->ic_newassoc)(ic, ni, 1);
/* NB: hold reference */
} else {
/* XXX optimize to avoid work done above */
ieee80211_free_node(ic, 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_MAXSIZE);
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
ic->ic_stats.is_rx_ssidmismatch++;
return;
}
if (ni == ic->ic_bss) {
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;
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)
ieee80211_free_node(ic, 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)));
ic->ic_stats.is_rx_auth_unsupported++;
return;
}
switch (ic->ic_opmode) {
case IEEE80211_M_IBSS:
if (ic->ic_state != IEEE80211_S_RUN || seq != 1) {
IEEE80211_DPRINTF(("%s: discard auth from %s; "
"state %u, seq %u\n", __func__,
ether_sprintf(wh->i_addr2),
ic->ic_state, seq));
ic->ic_stats.is_rx_bad_auth++;
break;
}
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 != 1) {
IEEE80211_DPRINTF(("%s: discard auth from %s; "
"state %u, seq %u\n", __func__,
ether_sprintf(wh->i_addr2),
ic->ic_state, seq));
ic->ic_stats.is_rx_bad_auth++;
break;
}
if (ni == ic->ic_bss) {
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_chan = ic->ic_bss->ni_chan;
allocbs = 1;
} else
allocbs = 0;
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));
break;
case IEEE80211_M_STA:
if (ic->ic_state != IEEE80211_S_AUTH || seq != 2) {
IEEE80211_DPRINTF(("%s: discard auth from %s; "
"state %u, seq %u\n", __func__,
ether_sprintf(wh->i_addr2),
ic->ic_state, seq));
ic->ic_stats.is_rx_bad_auth++;
break;
}
if (status != 0) {
if_printf(&ic->ic_if,
"authentication failed (reason %d) for %s\n",
status,
ether_sprintf(wh->i_addr3));
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;
}
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)));
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 = 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);
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
ic->ic_stats.is_rx_ssidmismatch++;
return;
}
if (ni == ic->ic_bss) {
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) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_ASSOC_NOT_AUTHED);
ieee80211_free_node(ic, ni);
}
ic->ic_stats.is_rx_assoc_notauth++;
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);
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(("%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);
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 (ni->ni_associd == 0) {
/* XXX handle rollover at 2007 */
/* XXX guarantee uniqueness */
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);
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));
if (ni != ic->ic_bss)
ni->ni_fails++;
ic->ic_stats.is_rx_auth_fail++;
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_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_new_state(ic, 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);
ic->ic_stats.is_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) {
if (ifp->if_flags & IFF_DEBUG)
if_printf(ifp, "station %s deauthenticated"
" by peer (reason %d)\n",
ether_sprintf(ni->ni_macaddr), reason);
/* node will be free'd on return */
ieee80211_unref_node(&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);
ic->ic_stats.is_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) {
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;
/* XXX node reclaimed how? */
}
break;
default:
break;
}
break;
}
default:
IEEE80211_DPRINTF(("%s: mgmt frame with subtype 0x%x not "
"handled\n", __func__, subtype));
ic->ic_stats.is_rx_badsubtype++;
break;
}
}
#undef IEEE80211_VERIFY_LENGTH
#undef IEEE80211_VERIFY_ELEMENT
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