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NetBSD/sys/net80211/ieee80211_input.c
dyoung a4bb6a73ed Fix a misuse of ether_sprintf so that IBSS merges are printed 
xx:xx:xx:xx:xx:xx -> yy:yy:yy:yy:yy:yy instead of
xx:xx:xx:xx:xx:xx -> xx:xx:xx:xx:xx:xx.
2005-01-16 11:36:54 +00:00

1635 lines
46 KiB
C
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/* $NetBSD: ieee80211_input.c,v 1.37 2005/01/16 11:36:54 dyoung Exp $ */
/*-
* 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>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD: src/sys/net80211/ieee80211_input.c,v 1.20 2004/04/02 23:35:24 sam Exp $");
#else
__KERNEL_RCSID(0, "$NetBSD: ieee80211_input.c,v 1.37 2005/01/16 11:36:54 dyoung Exp $");
#endif
#include "opt_inet.h"
#ifdef __NetBSD__
#include "bpfilter.h"
#endif /* __NetBSD__ */
#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>
#ifdef __FreeBSD__
#include <sys/bus.h>
#endif
#include <sys/proc.h>
#include <sys/sysctl.h>
#ifdef __FreeBSD__
#include <machine/atomic.h>
#endif
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_arp.h>
#ifdef __FreeBSD__
#include <net/ethernet.h>
#else
#include <net/if_ether.h>
#endif
#include <net/if_llc.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_compat.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#ifdef INET
#include <netinet/in.h>
#ifdef __FreeBSD__
#include <netinet/if_ether.h>
#else
#include <net/if_ether.h>
#endif
#endif
const struct timeval ieee80211_merge_print_intvl = {.tv_sec = 1, .tv_usec = 0};
static void ieee80211_recv_pspoll(struct ieee80211com *,
struct mbuf *, int, u_int32_t);
#ifdef IEEE80211_DEBUG
/*
* 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_state == IEEE80211_S_SCAN);
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
return (ic->ic_opmode == IEEE80211_M_IBSS);
}
return 1;
}
#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_int16_t rxseq;
ALTQ_DECL(struct altq_pktattr pktattr;)
IASSERT(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;
}
/*
* In monitor mode, send everything directly to bpf.
* Also do not process frames w/o i_addr2 any further.
* XXX may want to include the CRC
*/
if (ic->ic_opmode == IEEE80211_M_MONITOR ||
m->m_pkthdr.len < sizeof(struct ieee80211_frame_min))
goto out;
wh = mtod(m, struct ieee80211_frame *);
if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
IEEE80211_FC0_VERSION_0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
("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)) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
("%s: frame too short, len %u\n",
__func__, m->m_pkthdr.len));
ic->ic_stats.is_rx_tooshort++;
goto out;
}
if (ic->ic_state != IEEE80211_S_SCAN) {
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;
if (ic->ic_opmode == IEEE80211_M_MONITOR)
goto out;
}
if (ic->ic_set_tim != NULL &&
(wh->i_fc[1] & IEEE80211_FC1_PWR_MGT)
&& ni->ni_pwrsave == 0) {
/* turn on power save mode */
if (ifp->if_flags & IFF_DEBUG)
printf("%s: power save mode on for %s\n",
ifp->if_xname, ether_sprintf(wh->i_addr2));
ni->ni_pwrsave = IEEE80211_PS_SLEEP;
}
if (ic->ic_set_tim != NULL &&
(wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) == 0 &&
ni->ni_pwrsave != 0) {
/* turn off power save mode, dequeue stored packets */
ni->ni_pwrsave = 0;
if (ic->ic_set_tim)
ic->ic_set_tim(ic, ni->ni_associd, 0);
if (ifp->if_flags & IFF_DEBUG)
printf("%s: power save mode off for %s\n",
ifp->if_xname, ether_sprintf(wh->i_addr2));
while (!IF_IS_EMPTY(&ni->ni_savedq)) {
struct mbuf *m;
IF_DEQUEUE(&ni->ni_savedq, m);
IF_ENQUEUE(&ic->ic_pwrsaveq, m);
(*ifp->if_start)(ifp);
}
}
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 (ic->ic_state != IEEE80211_S_SCAN &&
!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) {
/* Source address is not our BSS. */
IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT,
("%s: discard frame from SA %s\n",
__func__, ether_sprintf(wh->i_addr2)));
ic->ic_stats.is_rx_wrongbss++;
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;
}
if (ic->ic_state != IEEE80211_S_SCAN &&
!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid) &&
!IEEE80211_ADDR_EQ(wh->i_addr3, ifp->if_broadcastaddr)) {
/* Destination is not our BSS or broadcast. */
IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT,
("%s: discard data frame to DA %s\n",
__func__, ether_sprintf(wh->i_addr3)));
ic->ic_stats.is_rx_wrongbss++;
goto out;
}
break;
case IEEE80211_M_HOSTAP:
if (dir != IEEE80211_FC1_DIR_TODS) {
ic->ic_stats.is_rx_wrongdir++;
goto out;
}
if (ic->ic_state != IEEE80211_S_SCAN &&
!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_bss->ni_bssid) &&
!IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
/* BSS is not us or broadcast. */
IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT,
("%s: discard data frame to BSS %s\n",
__func__, ether_sprintf(wh->i_addr1)));
ic->ic_stats.is_rx_wrongbss++;
goto out;
}
/* check if source STA is associated */
if (ni == ic->ic_bss) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT,
("%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);
}
ic->ic_stats.is_rx_notassoc++;
goto err;
}
if (ni->ni_associd == 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT,
("%s: data from unassoc src %s\n",
__func__, ether_sprintf(wh->i_addr2)));
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_NOT_ASSOCED);
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_PRIVACY) {
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;
}
}
#if NBPFILTER > 0
/* copy to listener after decrypt */
if (ic->ic_rawbpf)
bpf_mtap(ic->ic_rawbpf, m);
#endif
m = ieee80211_decap(ifp, m);
if (m == NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT,
("%s: decapsulation error for src %s\n",
__func__, ether_sprintf(wh->i_addr2)));
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;
}
}
}
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) {
#if NBPFILTER > 0
/*
* If we forward packet into transmitter of the AP,
* we don't need to duplicate for DLT_EN10MB.
*/
if (ifp->if_bpf && m1 == NULL)
bpf_mtap(ifp->if_bpf, m);
#endif
(*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;
}
}
#ifdef IEEE80211_DEBUG
if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) ||
ieee80211_msg_dumppkts(ic)) {
if_printf(ifp, "received %s from %s rssi %d\n",
ieee80211_mgt_subtype_name[subtype
>> IEEE80211_FC0_SUBTYPE_SHIFT],
ether_sprintf(wh->i_addr2), rssi);
}
#endif
#if NBPFILTER > 0
if (ic->ic_rawbpf)
bpf_mtap(ic->ic_rawbpf, m);
#endif
(*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++;
if (ic->ic_opmode != IEEE80211_M_HOSTAP)
goto out;
subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
if (subtype == IEEE80211_FC0_SUBTYPE_PS_POLL) {
/* XXX statistic */
/* Dump out a single packet from the host */
if (ifp->if_flags & IFF_DEBUG)
printf("%s: got power save probe from %s\n",
ifp->if_xname,
ether_sprintf(wh->i_addr2));
ieee80211_recv_pspoll(ic, m, rssi, rstamp);
}
goto out;
default:
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
("%s: bad frame type %x\n", __func__, type));
/* 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(ic, IEEE80211_MSG_ANY,
("%s: discard DS to DS frame\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;
}
#ifdef __FreeBSD__
M_MOVE_PKTHDR(n, m);
#else
M_COPY_PKTHDR(n, m);
#endif
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",
__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(ic, IEEE80211_MSG_ELEMID, \
("%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(ic, IEEE80211_MSG_ELEMID, \
("%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(ic, IEEE80211_MSG_ELEMID, \
("%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)
#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] %s req ssid mismatch: ", ether_sprintf(mac), tag);
ieee80211_print_essid(ssid + 2, ssid[1]);
printf("\n");
}
#define IEEE80211_VERIFY_SSID(_ni, _ssid, _packet_type) 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, _packet_type, \
wh->i_addr2, _ssid); \
ic->ic_stats.is_rx_ssidmismatch++; \
return; \
} \
} while (0)
#else /* !IEEE80211_DEBUG */
#define IEEE80211_VERIFY_SSID(_ni, _ssid, _packet_type) 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 */
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) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%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++;
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) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%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++;
return;
}
if (ni == ic->ic_bss) {
ni = ieee80211_alloc_node(ic, wh->i_addr2);
if (ni == NULL) {
ic->ic_stats.is_rx_nodealloc++;
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;
}
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
("station %s %s authenticated (open)\n",
ether_sprintf(ni->ni_macaddr),
((ni->ni_state != IEEE80211_STA_CACHE)
? "newly" : "already")));
ieee80211_node_newstate(ni, IEEE80211_STA_AUTH);
break;
case IEEE80211_M_STA:
if (ic->ic_state != IEEE80211_S_AUTH ||
seq != IEEE80211_AUTH_OPEN_RESPONSE) {
ic->ic_stats.is_rx_bad_auth++;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: discard auth from %s; state %u, seq %u\n",
__func__, ether_sprintf(wh->i_addr2),
ic->ic_state, seq));
return;
}
if (status != 0) {
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
("open 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;
}
}
/* TBD send appropriate responses on error? */
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 = NULL;
int i;
if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: WEP is off\n", __func__));
return;
}
if (frm + 1 < efrm) {
if (frm[1] + 2 > efrm - frm) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: elt %d %d bytes too long\n", __func__,
frm[0], (frm[1] + 2) - (int)(efrm - frm)));
ic->ic_stats.is_rx_bad_auth++;
return;
}
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_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: no challenge sent\n", __func__));
ic->ic_stats.is_rx_bad_auth++;
return;
}
if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: bad challenge len %d\n",
__func__, challenge[1]));
ic->ic_stats.is_rx_bad_auth++;
return;
}
default:
break;
}
switch (ic->ic_opmode) {
case IEEE80211_M_MONITOR:
case IEEE80211_M_AHDEMO:
case IEEE80211_M_IBSS:
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: unexpected operating mode\n", __func__));
return;
case IEEE80211_M_HOSTAP:
if (ic->ic_state != IEEE80211_S_RUN) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: not running\n", __func__));
return;
}
switch (seq) {
case IEEE80211_AUTH_SHARED_REQUEST:
if (ni == ic->ic_bss) {
ni = ieee80211_alloc_node(ic, wh->i_addr2);
if (ni == NULL) {
ic->ic_stats.is_rx_nodealloc++;
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;
}
if (ni->ni_challenge == NULL)
ni->ni_challenge = (u_int32_t*)malloc(
IEEE80211_CHALLENGE_LEN, M_DEVBUF,
M_NOWAIT);
if (ni->ni_challenge == NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: challenge alloc failed\n",
__func__));
/* XXX statistic */
return;
}
for (i = IEEE80211_CHALLENGE_LEN / sizeof(u_int32_t);
--i >= 0; )
ni->ni_challenge[i] = arc4random();
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
("shared key %sauth request from station %s\n",
((ni->ni_state != IEEE80211_STA_CACHE)
? "" : "re"),
ether_sprintf(ni->ni_macaddr)));
break;
case IEEE80211_AUTH_SHARED_RESPONSE:
if (ni == ic->ic_bss) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: unknown STA\n", __func__));
return;
}
if (ni->ni_challenge == NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: no challenge recorded\n",
__func__));
ic->ic_stats.is_rx_bad_auth++;
return;
}
if (memcmp(ni->ni_challenge, &challenge[2],
challenge[1]) != 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: challenge mismatch\n", __func__));
ic->ic_stats.is_rx_auth_fail++;
return;
}
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
("station %s authenticated (shared key)\n",
ether_sprintf(ni->ni_macaddr)));
ieee80211_node_newstate(ni, IEEE80211_STA_AUTH);
break;
default:
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: bad shared key auth seq %d from %s\n",
__func__, seq, ether_sprintf(wh->i_addr2)));
ic->ic_stats.is_rx_bad_auth++;
return;
}
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: auth failed (reason %d) for %s\n",
__func__, 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_AUTH_SHARED_CHALLENGE:
if (ni->ni_challenge == NULL)
ni->ni_challenge = (u_int32_t*)malloc(
challenge[1], M_DEVBUF, M_NOWAIT);
if (ni->ni_challenge == NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: challenge alloc failed\n", __func__));
/* XXX statistic */
return;
}
memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
break;
default:
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
("%s: bad seq %d from %s\n", __func__, seq,
ether_sprintf(wh->i_addr2)));
ic->ic_stats.is_rx_bad_auth++;
return;
}
break;
}
}
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;
int is_new, reassoc, resp;
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;
/*
* We process beacon/probe response frames for:
* o station mode: to collect state
* updates such as 802.11g slot time and for passive
* scanning of APs
* o adhoc mode: to discover neighbors
* o hostap mode: for passive scanning of neighbor APs
* o when scanning
* In other words, in all modes other than monitor (which
* does not process incoming packets) and adhoc-demo (which
* does not use management frames at all).
*/
#ifdef DIAGNOSTIC
if (ic->ic_opmode != IEEE80211_M_STA &&
ic->ic_opmode != IEEE80211_M_IBSS &&
ic->ic_opmode != IEEE80211_M_HOSTAP &&
ic->ic_state != IEEE80211_S_SCAN) {
panic("%s: impossible", __func__);
}
#endif
/*
* 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(ic,
IEEE80211_MSG_ELEMID,
("%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_DPRINTF(ic, IEEE80211_MSG_ELEMID,
("%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(ic, IEEE80211_MSG_ELEMID,
("%s: ignore %s with invalid channel %u\n",
__func__,
ISPROBE(subtype) ? "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(ic, IEEE80211_MSG_ELEMID,
("%s: ignore %s on channel %u marked "
"for channel %u\n", __func__,
ISPROBE(subtype) ? "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_find_node_for_beacon(ic, wh->i_addr2,
&ic->ic_channels[chan], ssid);
#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) {
int i;
printf("%s: country info", __func__);
for (i = 0; i < country[1]; i++)
printf(" %02x", country[i+2]);
printf("\n");
}
}
#endif
if (ni == NULL) {
ni = ieee80211_alloc_node(ic, wh->i_addr2);
if (ni == NULL)
return;
is_new = 1;
} else
is_new = 0;
if (ssid[1] != 0 && ni->ni_esslen == 0) {
/*
* 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;
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_opmode == IEEE80211_M_IBSS || (is_new &&
ISPROBE(subtype))) {
/*
* 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);
}
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);
IEEE80211_VERIFY_SSID(ic->ic_bss, ssid, "probe");
if (ni == ic->ic_bss) {
ni = ieee80211_dup_bss(ic, wh->i_addr2);
if (ni == NULL)
return;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
("%s: new probe req from %s\n",
__func__, 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_DPRINTF(ic, IEEE80211_MSG_XRATE,
("%s: rate negotiation failed: %s\n",
__func__,ether_sprintf(wh->i_addr2)));
} else {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0);
}
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: algorithm %d seq %d from %s\n",
__func__, algo, seq, ether_sprintf(wh->i_addr2)));
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_DPRINTF(ic, IEEE80211_MSG_ANY,
("%s: unsupported auth algorithm %d from %s\n",
__func__, algo, ether_sprintf(wh->i_addr2)));
ic->ic_stats.is_rx_auth_unsupported++;
return;
}
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(ic, IEEE80211_MSG_ANY,
("%s: ignore assoc request with bss %s not "
"our own\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);
IEEE80211_VERIFY_SSID(ic->ic_bss, ssid,
reassoc ? "reassoc" : "assoc");
if (ni->ni_state != IEEE80211_STA_AUTH &&
ni->ni_state != IEEE80211_STA_ASSOC) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
("%s: deny %sassoc from %s, not authenticated\n",
__func__, reassoc ? "re" : "",
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);
}
ic->ic_stats.is_rx_assoc_notauth++;
return;
}
/* discard challenge after association */
if (ni->ni_challenge != NULL) {
FREE(ni->ni_challenge, M_DEVBUF);
ni->ni_challenge = NULL;
}
/* 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_PRIVACY) ?
IEEE80211_CAPINFO_PRIVACY : 0)) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
("%s: capability mismatch %x for %s\n",
__func__, capinfo, ether_sprintf(wh->i_addr2)));
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: rate mismatch for %s\n",
__func__, ether_sprintf(wh->i_addr2)));
/* XXX what rate will we send this at? */
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;
ieee80211_node_join(ic, ni, resp);
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) {
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
*/
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) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
("%sassociation failed (reason %d) for %s\n",
ISREASSOC(subtype) ? "re" : "",
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) {
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:
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) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
("station %s disassociated by "
"peer (reason %d)\n",
ether_sprintf(ni->ni_macaddr), reason));
ieee80211_node_leave(ic, ni);
}
break;
default:
break;
}
break;
}
default:
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
("%s: mgmt frame with subtype 0x%x not handled\n",
__func__, subtype));
ic->ic_stats.is_rx_badsubtype++;
break;
}
}
static void
ieee80211_recv_pspoll(struct ieee80211com *ic, struct mbuf *m0, int rssi,
u_int32_t rstamp)
{
struct ifnet *ifp = &ic->ic_if;
struct ieee80211_frame *wh;
struct ieee80211_node *ni;
struct mbuf *m;
u_int16_t aid;
if (ic->ic_set_tim == NULL) /* No powersaving functionality */
return;
wh = mtod(m0, struct ieee80211_frame *);
if ((ni = ieee80211_find_node(ic, wh->i_addr2)) == NULL) {
if (ifp->if_flags & IFF_DEBUG)
printf("%s: station %s sent bogus power save poll\n",
ifp->if_xname, ether_sprintf(wh->i_addr2));
return;
}
memcpy(&aid, wh->i_dur, sizeof(wh->i_dur));
if ((aid & 0xc000) != 0xc000) {
if (ifp->if_flags & IFF_DEBUG)
printf("%s: station %s sent bogus aid %x\n",
ifp->if_xname, ether_sprintf(wh->i_addr2), aid);
return;
}
if (aid != ni->ni_associd) {
if (ifp->if_flags & IFF_DEBUG)
printf("%s: station %s aid %x doesn't match pspoll "
"aid %x\n",
ifp->if_xname, ether_sprintf(wh->i_addr2),
ni->ni_associd, aid);
return;
}
/* Okay, take the first queued packet and put it out... */
IF_DEQUEUE(&ni->ni_savedq, m);
if (m == NULL) {
if (ifp->if_flags & IFF_DEBUG)
printf("%s: station %s sent pspoll, "
"but no packets are saved\n",
ifp->if_xname, ether_sprintf(wh->i_addr2));
return;
}
wh = mtod(m, struct ieee80211_frame *);
/*
* If this is the last packet, turn off the TIM fields.
* If there are more packets, set the more packets bit.
*/
if (IF_IS_EMPTY(&ni->ni_savedq)) {
if (ic->ic_set_tim)
ic->ic_set_tim(ic, ni->ni_associd, 0);
} else {
wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
}
if (ifp->if_flags & IFF_DEBUG)
printf("%s: enqueued power saving packet for station %s\n",
ifp->if_xname, ether_sprintf(ni->ni_macaddr));
IF_ENQUEUE(&ic->ic_pwrsaveq, m);
(*ifp->if_start)(ifp);
}
static int
do_slow_print(struct ieee80211com *ic, int *did_print)
{
if ((ic->ic_if.if_flags & IFF_LINK0) == 0)
return 0;
if (!*did_print && (ic->ic_if.if_flags & IFF_DEBUG) == 0 &&
!ratecheck(&ic->ic_last_merge_print, &ieee80211_merge_print_intvl))
return 0;
*did_print = 1;
return 1;
}
/* ieee80211_ibss_merge helps merge 802.11 ad hoc networks. The
* convention, set by the Wireless Ethernet Compatibility Alliance
* (WECA), is that an 802.11 station will change its BSSID to match
* the "oldest" 802.11 ad hoc network, on the same channel, that
* has the station's desired SSID. The "oldest" 802.11 network
* sends beacons with the greatest TSF timestamp.
*
* Return ENETRESET if the BSSID changed, 0 otherwise.
*
* XXX Perhaps we should compensate for the time that elapses
* between the MAC receiving the beacon and the host processing it
* in ieee80211_ibss_merge.
*/
int
ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni)
{
int did_print = 0;
if (memcmp(ni->ni_bssid, ic->ic_bss->ni_bssid, IEEE80211_ADDR_LEN) == 0)
return 0;
if (ieee80211_match_bss(ic, ni) != 0)
return 0;
ic->ic_flags &= ~IEEE80211_F_SIBSS;
/* negotiate rates with new IBSS */
ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (ni->ni_rates.rs_nrates == 0) {
if (do_slow_print(ic, &did_print)) {
printf("%s: rates mismatch, BSSID %s\n",
ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid));
}
return 0;
}
printf("%s: bss merge %s -> ", ic->ic_if.if_xname,
ether_sprintf(ic->ic_bss->ni_bssid));
(*ic->ic_node_copy)(ic, ic->ic_bss, ni);
ieee80211_node_newstate(ic->ic_bss, IEEE80211_STA_BSS);
printf("%s\n", ether_sprintf(ic->ic_bss->ni_bssid));
return ENETRESET;
}
#undef IEEE80211_VERIFY_LENGTH
#undef IEEE80211_VERIFY_ELEMENT
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