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freebsd-dev/sys/net80211/ieee80211_input.c
Sam Leffler 6bbdc70146 correct decap of of AppleTalk and IPX frames; don't strip the SNAP 
header as they have one natively

Submitted by:	Chris Zimmermann
2008-08-02 18:02:57 +00:00

939 lines
26 KiB
C
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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_llc.h>
#include <net/if_media.h>
#include <net/if_vlan_var.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_input.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <net/ethernet.h>
#endif
int
ieee80211_input_all(struct ieee80211com *ic,
struct mbuf *m, int rssi, int noise, u_int32_t rstamp)
{
struct ieee80211vap *vap;
int type = -1;
/* XXX locking */
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
struct ieee80211_node *ni;
struct mbuf *mcopy;
/*
* WDS vap's only receive directed traffic from the
* station at the ``far end''. That traffic should
* be passed through the AP vap the station is associated
* to--so don't spam them with mcast frames.
*/
if (vap->iv_opmode == IEEE80211_M_WDS)
continue;
if (TAILQ_NEXT(vap, iv_next) != NULL) {
/*
* Packet contents are changed by ieee80211_decap
* so do a deep copy of the packet.
*/
mcopy = m_dup(m, M_DONTWAIT);
if (mcopy == NULL) {
/* XXX stat+msg */
continue;
}
} else {
mcopy = m;
m = NULL;
}
ni = ieee80211_ref_node(vap->iv_bss);
type = ieee80211_input(ni, mcopy, rssi, noise, rstamp);
ieee80211_free_node(ni);
}
if (m != NULL) /* no vaps, reclaim mbuf */
m_freem(m);
return type;
}
/*
* This function reassemble fragments.
*
* XXX should handle 3 concurrent reassemblies per-spec.
*/
struct mbuf *
ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
struct ieee80211_frame *lwh;
uint16_t rxseq;
uint8_t fragno;
uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
struct mbuf *mfrag;
KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
rxseq = le16toh(*(uint16_t *)wh->i_seq);
fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
/* Quick way out, if there's nothing to defragment */
if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
return m;
/*
* Remove frag to insure it doesn't get reaped by timer.
*/
if (ni->ni_table == NULL) {
/*
* Should never happen. If the node is orphaned (not in
* the table) then input packets should not reach here.
* Otherwise, a concurrent request that yanks the table
* should be blocked by other interlocking and/or by first
* shutting the driver down. Regardless, be defensive
* here and just bail
*/
/* XXX need msg+stat */
m_freem(m);
return NULL;
}
IEEE80211_NODE_LOCK(ni->ni_table);
mfrag = ni->ni_rxfrag[0];
ni->ni_rxfrag[0] = NULL;
IEEE80211_NODE_UNLOCK(ni->ni_table);
/*
* Validate new fragment is in order and
* related to the previous ones.
*/
if (mfrag != NULL) {
uint16_t last_rxseq;
lwh = mtod(mfrag, struct ieee80211_frame *);
last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
/* NB: check seq # and frag together */
if (rxseq != last_rxseq+1 ||
!IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) ||
!IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
/*
* Unrelated fragment or no space for it,
* clear current fragments.
*/
m_freem(mfrag);
mfrag = NULL;
}
}
if (mfrag == NULL) {
if (fragno != 0) { /* !first fragment, discard */
vap->iv_stats.is_rx_defrag++;
IEEE80211_NODE_STAT(ni, rx_defrag);
m_freem(m);
return NULL;
}
mfrag = m;
} else { /* concatenate */
m_adj(m, hdrspace); /* strip header */
m_cat(mfrag, m);
/* NB: m_cat doesn't update the packet header */
mfrag->m_pkthdr.len += m->m_pkthdr.len;
/* track last seqnum and fragno */
lwh = mtod(mfrag, struct ieee80211_frame *);
*(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
}
if (more_frag) { /* more to come, save */
ni->ni_rxfragstamp = ticks;
ni->ni_rxfrag[0] = mfrag;
mfrag = NULL;
}
return mfrag;
}
void
ieee80211_deliver_data(struct ieee80211vap *vap,
struct ieee80211_node *ni, struct mbuf *m)
{
struct ether_header *eh = mtod(m, struct ether_header *);
struct ifnet *ifp = vap->iv_ifp;
/* NB: see hostap_deliver_data, this path doesn't handle hostap */
KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
/*
* Do accounting.
*/
ifp->if_ipackets++;
IEEE80211_NODE_STAT(ni, rx_data);
IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
m->m_flags |= M_MCAST; /* XXX M_BCAST? */
IEEE80211_NODE_STAT(ni, rx_mcast);
} else
IEEE80211_NODE_STAT(ni, rx_ucast);
m->m_pkthdr.rcvif = ifp;
/* clear driver/net80211 flags before passing up */
m->m_flags &= ~M_80211_RX;
if (ni->ni_vlan != 0) {
/* attach vlan tag */
m->m_pkthdr.ether_vtag = ni->ni_vlan;
m->m_flags |= M_VLANTAG;
}
ifp->if_input(ifp, m);
}
struct mbuf *
ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
{
struct ieee80211_qosframe_addr4 wh; /* Max size address frames */
struct ether_header *eh;
struct llc *llc;
if (m->m_len < hdrlen + sizeof(*llc) &&
(m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
/* XXX stat, msg */
return NULL;
}
memcpy(&wh, mtod(m, caddr_t), hdrlen);
llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
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 &&
/* NB: preserve AppleTalk frames that have a native SNAP hdr */
!(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
llc = NULL;
} else {
m_adj(m, hdrlen - 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:
IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
break;
}
#ifdef ALIGNED_POINTER
if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_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;
}
/*
* Decap a frame encapsulated in a fast-frame/A-MSDU.
*/
struct mbuf *
ieee80211_decap1(struct mbuf *m, int *framelen)
{
#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
struct ether_header *eh;
struct llc *llc;
/*
* The frame has an 802.3 header followed by an 802.2
* LLC header. The encapsulated frame length is in the
* first header type field; save that and overwrite it
* with the true type field found in the second. Then
* copy the 802.3 header up to where it belongs and
* adjust the mbuf contents to remove the void.
*/
if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
return NULL;
eh = mtod(m, struct ether_header *); /* 802.3 header is first */
llc = (struct llc *)&eh[1]; /* 802.2 header follows */
*framelen = ntohs(eh->ether_type) /* encap'd frame size */
+ sizeof(struct ether_header) - sizeof(struct llc);
eh->ether_type = llc->llc_un.type_snap.ether_type;
ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
sizeof(struct ether_header));
m_adj(m, sizeof(struct llc));
return m;
#undef FF_LLC_SIZE
}
/*
* Decap the encapsulated frame pair and dispatch the first
* for delivery. The second frame is returned for delivery
* via the normal path.
*/
struct mbuf *
ieee80211_decap_fastframe(struct ieee80211_node *ni, struct mbuf *m)
{
#define MS(x,f) (((x) & f) >> f##_S)
struct ieee80211vap *vap = ni->ni_vap;
uint32_t ath;
struct mbuf *n;
int framelen;
m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath);
if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"unsupport tunnel protocol, header 0x%x", ath);
vap->iv_stats.is_ff_badhdr++;
m_freem(m);
return NULL;
}
/* NB: skip header and alignment padding */
m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2);
vap->iv_stats.is_ff_decap++;
/*
* Decap the first frame, bust it apart from the
* second and deliver; then decap the second frame
* and return it to the caller for normal delivery.
*/
m = ieee80211_decap1(m, &framelen);
if (m == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
vap->iv_stats.is_ff_tooshort++;
return NULL;
}
n = m_split(m, framelen, M_NOWAIT);
if (n == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"%s", "unable to split encapsulated frames");
vap->iv_stats.is_ff_split++;
m_freem(m); /* NB: must reclaim */
return NULL;
}
/* XXX not right for WDS */
vap->iv_deliver_data(vap, ni, m); /* 1st of pair */
/*
* Decap second frame.
*/
m_adj(n, roundup2(framelen, 4) - framelen); /* padding */
n = ieee80211_decap1(n, &framelen);
if (n == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
vap->iv_stats.is_ff_tooshort++;
}
/* XXX verify framelen against mbuf contents */
return n; /* 2nd delivered by caller */
#undef MS
}
/*
* Install received rate set information in the node's state block.
*/
int
ieee80211_setup_rates(struct ieee80211_node *ni,
const uint8_t *rates, const uint8_t *xrates, int flags)
{
struct ieee80211vap *vap = ni->ni_vap;
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) {
uint8_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_NOTE(vap, IEEE80211_MSG_XRATE, ni,
"extended rate set too large; only using "
"%u of %u rates", nxrates, xrates[1]);
vap->iv_stats.is_rx_rstoobig++;
}
memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
rs->rs_nrates += nxrates;
}
return ieee80211_fix_rate(ni, rs, flags);
}
/*
* Send a management frame error response to the specified
* station. If ni is associated with the station then use
* it; otherwise allocate a temporary node suitable for
* transmitting the frame and then free the reference so
* it will go away as soon as the frame has been transmitted.
*/
void
ieee80211_send_error(struct ieee80211_node *ni,
const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
{
struct ieee80211vap *vap = ni->ni_vap;
int istmp;
if (ni == vap->iv_bss) {
if (vap->iv_state != IEEE80211_S_RUN) {
/*
* XXX hack until we get rid of this routine.
* We can be called prior to the vap reaching
* run state under certain conditions in which
* case iv_bss->ni_chan will not be setup.
* Check for this explicitly and and just ignore
* the request.
*/
return;
}
ni = ieee80211_tmp_node(vap, mac);
if (ni == NULL) {
/* XXX msg */
return;
}
istmp = 1;
} else
istmp = 0;
IEEE80211_SEND_MGMT(ni, subtype, arg);
if (istmp)
ieee80211_free_node(ni);
}
int
ieee80211_alloc_challenge(struct ieee80211_node *ni)
{
if (ni->ni_challenge == NULL)
MALLOC(ni->ni_challenge, uint32_t*, IEEE80211_CHALLENGE_LEN,
M_80211_NODE, M_NOWAIT);
if (ni->ni_challenge == NULL) {
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
"%s", "shared key challenge alloc failed");
/* XXX statistic */
}
return (ni->ni_challenge != NULL);
}
void
ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie)
{
const struct ieee80211_ath_ie *ath =
(const struct ieee80211_ath_ie *) ie;
ni->ni_ath_flags = ath->ath_capability;
ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix);
}
/*
* Parse a Beacon or ProbeResponse frame and return the
* useful information in an ieee80211_scanparams structure.
* Status is set to 0 if no problems were found; otherwise
* a bitmask of IEEE80211_BPARSE_* items is returned that
* describes the problems detected.
*/
int
ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
struct ieee80211_scanparams *scan)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_frame *wh;
uint8_t *frm, *efrm;
wh = mtod(m, struct ieee80211_frame *);
frm = (uint8_t *)&wh[1];
efrm = mtod(m, uint8_t *) + m->m_len;
scan->status = 0;
/*
* beacon/probe response frame format
* [8] time stamp
* [2] beacon interval
* [2] capability information
* [tlv] ssid
* [tlv] supported rates
* [tlv] country information
* [tlv] parameter set (FH/DS)
* [tlv] erp information
* [tlv] extended supported rates
* [tlv] WME
* [tlv] WPA or RSN
* [tlv] HT capabilities
* [tlv] HT information
* [tlv] Atheros capabilities
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
return (scan->status = IEEE80211_BPARSE_BADIELEN));
memset(scan, 0, sizeof(*scan));
scan->tstamp = frm; frm += 8;
scan->bintval = le16toh(*(uint16_t *)frm); frm += 2;
scan->capinfo = le16toh(*(uint16_t *)frm); frm += 2;
scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan);
scan->chan = scan->bchan;
scan->ies = frm;
scan->ies_len = efrm - frm;
while (efrm - frm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
return (scan->status = IEEE80211_BPARSE_BADIELEN));
switch (*frm) {
case IEEE80211_ELEMID_SSID:
scan->ssid = frm;
break;
case IEEE80211_ELEMID_RATES:
scan->rates = frm;
break;
case IEEE80211_ELEMID_COUNTRY:
scan->country = frm;
break;
case IEEE80211_ELEMID_FHPARMS:
if (ic->ic_phytype == IEEE80211_T_FH) {
scan->fhdwell = LE_READ_2(&frm[2]);
scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
scan->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)
scan->chan = frm[2];
break;
case IEEE80211_ELEMID_TIM:
/* XXX ATIM? */
scan->tim = frm;
scan->timoff = frm - mtod(m, uint8_t *);
break;
case IEEE80211_ELEMID_IBSSPARMS:
case IEEE80211_ELEMID_CFPARMS:
/* NB: avoid debugging complaints */
break;
case IEEE80211_ELEMID_XRATES:
scan->xrates = frm;
break;
case IEEE80211_ELEMID_ERP:
if (frm[1] != 1) {
IEEE80211_DISCARD_IE(vap,
IEEE80211_MSG_ELEMID, wh, "ERP",
"bad len %u", frm[1]);
vap->iv_stats.is_rx_elem_toobig++;
break;
}
scan->erp = frm[2] | 0x100;
break;
case IEEE80211_ELEMID_HTCAP:
scan->htcap = frm;
break;
case IEEE80211_ELEMID_RSN:
scan->rsn = frm;
break;
case IEEE80211_ELEMID_HTINFO:
scan->htinfo = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(frm))
scan->wpa = frm;
else if (iswmeparam(frm) || iswmeinfo(frm))
scan->wme = frm;
else if (isatherosoui(frm))
scan->ath = frm;
else if (vap->iv_flags_ext & IEEE80211_FEXT_HTCOMPAT) {
/*
* Accept pre-draft HT ie's if the
* standard ones have not been seen.
*/
if (ishtcapoui(frm)) {
if (scan->htcap == NULL)
scan->htcap = frm;
} else if (ishtinfooui(frm)) {
if (scan->htinfo == NULL)
scan->htcap = frm;
}
}
break;
default:
IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
wh, "unhandled",
"id %u, len %u", *frm, frm[1]);
vap->iv_stats.is_rx_elem_unknown++;
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
scan->status |= IEEE80211_BPARSE_RATES_INVALID);
if (scan->rates != NULL && scan->xrates != NULL) {
/*
* NB: don't process XRATES if RATES is missing. This
* avoids a potential null ptr deref and should be ok
* as the return code will already note RATES is missing
* (so callers shouldn't otherwise process the frame).
*/
IEEE80211_VERIFY_ELEMENT(scan->xrates,
IEEE80211_RATE_MAXSIZE - scan->rates[1],
scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
}
IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
scan->status |= IEEE80211_BPARSE_SSID_INVALID);
#if IEEE80211_CHAN_MAX < 255
if (scan->chan > IEEE80211_CHAN_MAX) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID,
wh, NULL, "invalid channel %u", scan->chan);
vap->iv_stats.is_rx_badchan++;
scan->status |= IEEE80211_BPARSE_CHAN_INVALID;
}
#endif
if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
/*
* Frame was received on a channel different from the
* one indicated in the DS params element id;
* silently discard it.
*
* NB: this can happen due to signal leakage.
* But we should take it for FH phy because
* the rssi value should be correct even for
* different hop pattern in FH.
*/
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
wh, NULL, "for off-channel %u", scan->chan);
vap->iv_stats.is_rx_chanmismatch++;
scan->status |= IEEE80211_BPARSE_OFFCHAN;
}
if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
scan->bintval <= IEEE80211_BINTVAL_MAX)) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
wh, NULL, "bogus beacon interval", scan->bintval);
vap->iv_stats.is_rx_badbintval++;
scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
}
if (scan->country != NULL) {
/*
* Validate we have at least enough data to extract
* the country code. Not sure if we should return an
* error instead of discarding the IE; consider this
* being lenient as we don't depend on the data for
* correct operation.
*/
IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
scan->country = NULL);
}
/*
* Process HT ie's. This is complicated by our
* accepting both the standard ie's and the pre-draft
* vendor OUI ie's that some vendors still use/require.
*/
if (scan->htcap != NULL) {
IEEE80211_VERIFY_LENGTH(scan->htcap[1],
scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
4 + sizeof(struct ieee80211_ie_htcap)-2 :
sizeof(struct ieee80211_ie_htcap)-2,
scan->htcap = NULL);
}
if (scan->htinfo != NULL) {
IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
4 + sizeof(struct ieee80211_ie_htinfo)-2 :
sizeof(struct ieee80211_ie_htinfo)-2,
scan->htinfo = NULL);
}
return scan->status;
}
/*
* Parse an Action frame. Return 0 on success, non-zero on failure.
*/
int
ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
{
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_action *ia;
struct ieee80211_frame *wh;
uint8_t *frm, *efrm;
/*
* action frame format:
* [1] category
* [1] action
* [tlv] parameters
*/
wh = mtod(m, struct ieee80211_frame *);
frm = (u_int8_t *)&wh[1];
efrm = mtod(m, u_int8_t *) + m->m_len;
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action), return EINVAL);
ia = (const struct ieee80211_action *) frm;
vap->iv_stats.is_rx_action++;
IEEE80211_NODE_STAT(ni, rx_action);
/* verify frame payloads but defer processing */
/* XXX maybe push this to method */
switch (ia->ia_category) {
case IEEE80211_ACTION_CAT_BA:
switch (ia->ia_action) {
case IEEE80211_ACTION_BA_ADDBA_REQUEST:
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action_ba_addbarequest),
return EINVAL);
break;
case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action_ba_addbaresponse),
return EINVAL);
break;
case IEEE80211_ACTION_BA_DELBA:
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action_ba_delba),
return EINVAL);
break;
}
break;
case IEEE80211_ACTION_CAT_HT:
switch (ia->ia_action) {
case IEEE80211_ACTION_HT_TXCHWIDTH:
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action_ht_txchwidth),
return EINVAL);
break;
case IEEE80211_ACTION_HT_MIMOPWRSAVE:
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action_ht_mimopowersave),
return EINVAL);
break;
}
break;
}
return 0;
}
#ifdef IEEE80211_DEBUG
/*
* Debugging support.
*/
void
ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
{
printf("[%s] discard %s frame, ssid mismatch: ",
ether_sprintf(mac), tag);
ieee80211_print_essid(ssid + 2, ssid[1]);
printf("\n");
}
/*
* Return the bssid of a frame.
*/
static const uint8_t *
ieee80211_getbssid(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
{
if (vap->iv_opmode == IEEE80211_M_STA)
return wh->i_addr2;
if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
return wh->i_addr1;
if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
return wh->i_addr1;
return wh->i_addr3;
}
#include <machine/stdarg.h>
void
ieee80211_note(struct ieee80211vap *vap, const char *fmt, ...)
{
char buf[128]; /* XXX */
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if_printf(vap->iv_ifp, "%s", buf); /* NB: no \n */
}
void
ieee80211_note_frame(struct ieee80211vap *vap,
const struct ieee80211_frame *wh,
const char *fmt, ...)
{
char buf[128]; /* XXX */
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if_printf(vap->iv_ifp, "[%s] %s\n",
ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
}
void
ieee80211_note_mac(struct ieee80211vap *vap,
const uint8_t mac[IEEE80211_ADDR_LEN],
const char *fmt, ...)
{
char buf[128]; /* XXX */
va_list ap;
va_start(ap, fmt);
vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
}
void
ieee80211_discard_frame(struct ieee80211vap *vap,
const struct ieee80211_frame *wh,
const char *type, const char *fmt, ...)
{
va_list ap;
if_printf(vap->iv_ifp, "[%s] discard ",
ether_sprintf(ieee80211_getbssid(vap, wh)));
if (type == NULL) {
printf("%s frame, ", ieee80211_mgt_subtype_name[
(wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >>
IEEE80211_FC0_SUBTYPE_SHIFT]);
} else
printf("%s frame, ", type);
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
void
ieee80211_discard_ie(struct ieee80211vap *vap,
const struct ieee80211_frame *wh,
const char *type, const char *fmt, ...)
{
va_list ap;
if_printf(vap->iv_ifp, "[%s] discard ",
ether_sprintf(ieee80211_getbssid(vap, wh)));
if (type != NULL)
printf("%s information element, ", type);
else
printf("information element, ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
void
ieee80211_discard_mac(struct ieee80211vap *vap,
const uint8_t mac[IEEE80211_ADDR_LEN],
const char *type, const char *fmt, ...)
{
va_list ap;
if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
if (type != NULL)
printf("%s frame, ", type);
else
printf("frame, ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
#endif /* IEEE80211_DEBUG */
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