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freebsd-dev/sys/net80211/ieee80211_wds.c
Sam Leffler 72fecb4d6c follow prevailing style
2008-12-31 21:21:46 +00:00

860 lines
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/*-
* Copyright (c) 2007-2008 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>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif
/*
* IEEE 802.11 WDS mode support.
*/
#include "opt_inet.h"
#include "opt_wlan.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/proc.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/if_llc.h>
#include <net/ethernet.h>
#include <net/bpf.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_wds.h>
#include <net80211/ieee80211_input.h>
static void wds_vattach(struct ieee80211vap *);
static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
static int wds_input(struct ieee80211_node *ni, struct mbuf *m,
int rssi, int noise, uint32_t rstamp);
static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *,
int subtype, int rssi, int noise, u_int32_t rstamp);
void
ieee80211_wds_attach(struct ieee80211com *ic)
{
ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
}
void
ieee80211_wds_detach(struct ieee80211com *ic)
{
}
static void
wds_vdetach(struct ieee80211vap *vap)
{
if (vap->iv_bss != NULL) {
/* XXX locking? */
if (vap->iv_bss->ni_wdsvap == vap)
vap->iv_bss->ni_wdsvap = NULL;
}
}
static void
wds_vattach(struct ieee80211vap *vap)
{
vap->iv_newstate = wds_newstate;
vap->iv_input = wds_input;
vap->iv_recv_mgmt = wds_recv_mgmt;
vap->iv_opdetach = wds_vdetach;
}
static int
ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node_table *nt = &ic->ic_sta;
struct ieee80211_node *ni, *obss;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
"%s: creating link to %s on channel %u\n", __func__,
ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
/* NB: vap create must specify the bssid for the link */
KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
/* NB: we should only be called on RUN transition */
KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
/*
* Dynamic/non-legacy WDS. Reference the associated
* station specified by the desired bssid setup at vap
* create. Point ni_wdsvap at the WDS vap so 4-address
* frames received through the associated AP vap will
* be dispatched upward (e.g. to a bridge) as though
* they arrived on the WDS vap.
*/
IEEE80211_NODE_LOCK(nt);
obss = NULL;
ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
if (ni == NULL) {
/*
* Node went away before we could hookup. This
* should be ok; no traffic will flow and a leave
* event will be dispatched that should cause
* the vap to be destroyed.
*/
IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
"%s: station %s went away\n",
__func__, ether_sprintf(vap->iv_des_bssid));
/* XXX stat? */
} else if (ni->ni_wdsvap != NULL) {
/*
* Node already setup with a WDS vap; we cannot
* allow multiple references so disallow. If
* ni_wdsvap points at us that's ok; we should
* do nothing anyway.
*/
/* XXX printf instead? */
IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
"%s: station %s in use with %s\n",
__func__, ether_sprintf(vap->iv_des_bssid),
ni->ni_wdsvap->iv_ifp->if_xname);
/* XXX stat? */
} else {
/*
* Committed to new node, setup state.
*/
obss = vap->iv_bss;
vap->iv_bss = ni;
ni->ni_wdsvap = vap;
}
IEEE80211_NODE_UNLOCK(nt);
if (obss != NULL) {
/* NB: deferred to avoid recursive lock */
ieee80211_free_node(obss);
}
} else {
/*
* Legacy WDS vap setup.
*/
/*
* The far end does not associate so we just create
* create a new node and install it as the vap's
* bss node. We must simulate an association and
* authorize the port for traffic to flow.
* XXX check if node already in sta table?
*/
ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
if (ni != NULL) {
obss = vap->iv_bss;
vap->iv_bss = ieee80211_ref_node(ni);
ni->ni_flags |= IEEE80211_NODE_AREF;
if (obss != NULL)
ieee80211_free_node(obss);
/* give driver a chance to setup state like ni_txrate */
if (ic->ic_newassoc != NULL)
ic->ic_newassoc(ni, 1);
/* tell the authenticator about new station */
if (vap->iv_auth->ia_node_join != NULL)
vap->iv_auth->ia_node_join(ni);
if (ni->ni_authmode != IEEE80211_AUTH_8021X)
ieee80211_node_authorize(ni);
ieee80211_notify_node_join(ni, 1 /*newassoc*/);
/* XXX inject l2uf frame */
}
}
/*
* Flush pending frames now that were setup.
*/
if (ni != NULL && IEEE80211_NODE_WDSQ_QLEN(ni) != 0) {
int8_t rssi, noise;
IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni,
"flush wds queue, %u packets queued",
IEEE80211_NODE_WDSQ_QLEN(ni));
ic->ic_node_getsignal(ni, &rssi, &noise);
for (;;) {
struct mbuf *m;
IEEE80211_NODE_WDSQ_LOCK(ni);
_IEEE80211_NODE_WDSQ_DEQUEUE_HEAD(ni, m);
IEEE80211_NODE_WDSQ_UNLOCK(ni);
if (m == NULL)
break;
/* XXX cheat and re-use last rstamp */
ieee80211_input(ni, m, rssi, noise, ni->ni_rstamp);
}
}
return (ni == NULL ? ENOENT : 0);
}
/*
* Propagate multicast frames of an ap vap to all DWDS links.
* The caller is assumed to have verified this frame is multicast.
*/
void
ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
{
struct ieee80211com *ic = vap0->iv_ic;
struct ifnet *parent = ic->ic_ifp;
const struct ether_header *eh = mtod(m, const struct ether_header *);
struct ieee80211_node *ni;
struct ieee80211vap *vap;
struct ifnet *ifp;
struct mbuf *mcopy;
int err;
KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
("%s not mcast", ether_sprintf(eh->ether_dhost)));
/* XXX locking */
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
/* only DWDS vaps are interesting */
if (vap->iv_opmode != IEEE80211_M_WDS ||
(vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
continue;
/* if it came in this interface, don't send it back out */
ifp = vap->iv_ifp;
if (ifp == m->m_pkthdr.rcvif)
continue;
/*
* Duplicate the frame and send it. We don't need
* to classify or lookup the tx node; this was already
* done by the caller so we can just re-use the info.
*/
mcopy = m_copypacket(m, M_DONTWAIT);
if (mcopy == NULL) {
ifp->if_oerrors++;
/* XXX stat + msg */
continue;
}
ni = ieee80211_find_txnode(vap, eh->ether_dhost);
if (ni == NULL) {
/* NB: ieee80211_find_txnode does stat+msg */
ifp->if_oerrors++;
m_freem(mcopy);
continue;
}
if (ieee80211_classify(ni, mcopy)) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
eh->ether_dhost, NULL,
"%s", "classification failure");
vap->iv_stats.is_tx_classify++;
ifp->if_oerrors++;
m_freem(mcopy);
ieee80211_free_node(ni);
continue;
}
mcopy->m_flags |= M_MCAST | M_WDS;
mcopy->m_pkthdr.rcvif = (void *) ni;
err = parent->if_transmit(parent, mcopy);
if (err) {
/* NB: IFQ_HANDOFF reclaims mbuf */
ifp->if_oerrors++;
ieee80211_free_node(ni);
} else
ifp->if_opackets++;
}
}
/*
* Handle DWDS discovery on receipt of a 4-address frame in
* ap mode. Queue the frame and post an event for someone
* to plumb the necessary WDS vap for this station. Frames
* received prior to the vap set running will then be reprocessed
* as if they were just received.
*/
void
ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
int qlen, age;
IEEE80211_NODE_WDSQ_LOCK(ni);
if (!_IF_QFULL(&ni->ni_wdsq)) {
/*
* Tag the frame with it's expiry time and insert
* it in the queue. The aging interval is 4 times
* the listen interval specified by the station.
* Frames that sit around too long are reclaimed
* using this information.
*/
/* XXX handle overflow? */
/* XXX per/vap beacon interval? */
/* NB: TU -> secs */
age = ((ni->ni_intval * ic->ic_lintval) << 2) / 1024;
_IEEE80211_NODE_WDSQ_ENQUEUE(ni, m, qlen, age);
IEEE80211_NODE_WDSQ_UNLOCK(ni);
IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni,
"save frame, %u now queued", qlen);
} else {
vap->iv_stats.is_dwds_qdrop++;
_IF_DROP(&ni->ni_wdsq);
IEEE80211_NODE_WDSQ_UNLOCK(ni);
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT | IEEE80211_MSG_WDS,
mtod(m, struct ieee80211_frame *), "wds data",
"pending q overflow, drops %d (len %d)",
ni->ni_wdsq.ifq_drops, ni->ni_wdsq.ifq_len);
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_dumppkts(vap))
ieee80211_dump_pkt(ic, mtod(m, caddr_t),
m->m_len, -1, -1);
#endif
/* XXX tail drop? */
m_freem(m);
}
ieee80211_notify_wds_discover(ni);
}
/*
* Age frames on the WDS pending queue. The aging interval is
* 4 times the listen interval specified by the station. This
* number is factored into the age calculations when the frame
* is placed on the queue. We store ages as time differences
* so we can check and/or adjust only the head of the list.
* If a frame's age exceeds the threshold then discard it.
* The number of frames discarded is returned to the caller.
*/
int
ieee80211_node_wdsq_age(struct ieee80211_node *ni)
{
#ifdef IEEE80211_DEBUG
struct ieee80211vap *vap = ni->ni_vap;
#endif
struct mbuf *m;
int discard = 0;
IEEE80211_NODE_WDSQ_LOCK(ni);
while (_IF_POLL(&ni->ni_wdsq, m) != NULL &&
M_AGE_GET(m) < IEEE80211_INACT_WAIT) {
IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni,
"discard frame, age %u", M_AGE_GET(m));
/* XXX could be optimized */
_IEEE80211_NODE_WDSQ_DEQUEUE_HEAD(ni, m);
m_freem(m);
discard++;
}
if (m != NULL)
M_AGE_SUB(m, IEEE80211_INACT_WAIT);
IEEE80211_NODE_WDSQ_UNLOCK(ni);
IEEE80211_NOTE(vap, IEEE80211_MSG_WDS, ni,
"discard %u frames for age", discard);
#if 0
IEEE80211_NODE_STAT_ADD(ni, wds_discard, discard);
#endif
return discard;
}
/*
* IEEE80211_M_WDS vap state machine handler.
*/
static int
wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_node *ni;
enum ieee80211_state ostate;
int error;
IEEE80211_LOCK_ASSERT(ic);
ostate = vap->iv_state;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
vap->iv_state = nstate; /* state transition */
callout_stop(&vap->iv_mgtsend); /* XXX callout_drain */
if (ostate != IEEE80211_S_SCAN)
ieee80211_cancel_scan(vap); /* background scan */
ni = vap->iv_bss; /* NB: no reference held */
error = 0;
switch (nstate) {
case IEEE80211_S_INIT:
switch (ostate) {
case IEEE80211_S_SCAN:
ieee80211_cancel_scan(vap);
break;
default:
break;
}
if (ostate != IEEE80211_S_INIT) {
/* NB: optimize INIT -> INIT case */
ieee80211_reset_bss(vap);
}
break;
case IEEE80211_S_SCAN:
switch (ostate) {
case IEEE80211_S_INIT:
ieee80211_check_scan_current(vap);
break;
default:
break;
}
break;
case IEEE80211_S_RUN:
if (ostate == IEEE80211_S_INIT) {
/*
* Already have a channel; bypass the scan
* and startup immediately.
*/
error = ieee80211_create_wds(vap, ic->ic_curchan);
}
break;
default:
break;
}
return error;
}
/*
* 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 iv_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.
*/
static int
wds_input(struct ieee80211_node *ni, struct mbuf *m,
int rssi, int noise, uint32_t rstamp)
{
#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
#define HAS_SEQ(type) ((type & 0x4) == 0)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ifnet *ifp = vap->iv_ifp;
struct ieee80211_frame *wh;
struct ieee80211_key *key;
struct ether_header *eh;
int hdrspace, need_tap;
uint8_t dir, type, subtype, qos;
uint16_t rxseq;
if (m->m_flags & M_AMPDU_MPDU) {
/*
* Fastpath for A-MPDU reorder q resubmission. Frames
* w/ M_AMPDU_MPDU marked have already passed through
* here but were received out of order and been held on
* the reorder queue. When resubmitted they are marked
* with the M_AMPDU_MPDU flag and we can bypass most of
* the normal processing.
*/
wh = mtod(m, struct ieee80211_frame *);
type = IEEE80211_FC0_TYPE_DATA;
dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
subtype = IEEE80211_FC0_SUBTYPE_QOS;
hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */
goto resubmit_ampdu;
}
KASSERT(ni != NULL, ("null node"));
need_tap = 1; /* mbuf need to be tapped. */
type = -1; /* undefined */
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL,
"too short (1): len %u", m->m_pkthdr.len);
vap->iv_stats.is_rx_tooshort++;
goto out;
}
/*
* Bit of a cheat here, we use a pointer for a 3-address
* frame format but don't reference fields past outside
* ieee80211_frame_min w/o first validating the data is
* present.
*/
wh = mtod(m, struct ieee80211_frame *);
if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
IEEE80211_FC0_VERSION_0) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]);
vap->iv_stats.is_rx_badversion++;
goto err;
}
dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
/* NB: WDS vap's do not scan */
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
"too short (3): len %u", m->m_pkthdr.len);
vap->iv_stats.is_rx_tooshort++;
goto out;
}
/* NB: the TA is implicitly verified by finding the wds peer node */
if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
!IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
/* not interested in */
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
wh->i_addr1, NULL, "%s", "not to bss");
vap->iv_stats.is_rx_wrongbss++;
goto out;
}
IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
ni->ni_noise = noise;
ni->ni_rstamp = rstamp;
if (HAS_SEQ(type)) {
uint8_t tid = ieee80211_gettid(wh);
if (IEEE80211_QOS_HAS_SEQ(wh) &&
TID_TO_WME_AC(tid) >= WME_AC_VI)
ic->ic_wme.wme_hipri_traffic++;
rxseq = le16toh(*(uint16_t *)wh->i_seq);
if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 &&
(wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) {
/* duplicate, discard */
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
wh->i_addr1, "duplicate",
"seqno <%u,%u> fragno <%u,%u> tid %u",
rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
rxseq & IEEE80211_SEQ_FRAG_MASK,
ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
tid);
vap->iv_stats.is_rx_dup++;
IEEE80211_NODE_STAT(ni, rx_dup);
goto out;
}
ni->ni_rxseqs[tid] = rxseq;
}
switch (type) {
case IEEE80211_FC0_TYPE_DATA:
hdrspace = ieee80211_hdrspace(ic, wh);
if (m->m_len < hdrspace &&
(m = m_pullup(m, hdrspace)) == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL,
"data too short: expecting %u", hdrspace);
vap->iv_stats.is_rx_tooshort++;
goto out; /* XXX */
}
if (dir != IEEE80211_FC1_DIR_DSTODS) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "data", "incorrect dir 0x%x", dir);
vap->iv_stats.is_rx_wrongdir++;
goto out;
}
/*
* Only legacy WDS traffic should take this path.
*/
if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "data", "%s", "not legacy wds");
vap->iv_stats.is_rx_wrongdir++;/*XXX*/
goto out;
}
if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
ni->ni_inact = ni->ni_inact_reload;
/*
* Handle A-MPDU re-ordering. If the frame is to be
* processed directly then ieee80211_ampdu_reorder
* will return 0; otherwise it has consumed the mbuf
* and we should do nothing more with it.
*/
if ((m->m_flags & M_AMPDU) &&
ieee80211_ampdu_reorder(ni, m) != 0) {
m = NULL;
goto out;
}
resubmit_ampdu:
/*
* Handle privacy requirements. Note that we
* must not be preempted from here until after
* we (potentially) call ieee80211_crypto_demic;
* otherwise we may violate assumptions in the
* crypto cipher modules used to do delayed update
* of replay sequence numbers.
*/
if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
/*
* Discard encrypted frames when privacy is off.
*/
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "WEP", "%s", "PRIVACY off");
vap->iv_stats.is_rx_noprivacy++;
IEEE80211_NODE_STAT(ni, rx_noprivacy);
goto out;
}
key = ieee80211_crypto_decap(ni, m, hdrspace);
if (key == NULL) {
/* NB: stats+msgs handled in crypto_decap */
IEEE80211_NODE_STAT(ni, rx_wepfail);
goto out;
}
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
} else {
/* XXX M_WEP and IEEE80211_F_PRIVACY */
key = NULL;
}
/*
* Save QoS bits for use below--before we strip the header.
*/
if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
((struct ieee80211_qosframe *)wh)->i_qos[0];
} else
qos = 0;
/*
* Next up, any fragmentation.
*/
if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
m = ieee80211_defrag(ni, m, hdrspace);
if (m == NULL) {
/* Fragment dropped or frame not complete yet */
goto out;
}
}
wh = NULL; /* no longer valid, catch any uses */
/*
* Next strip any MSDU crypto bits.
*/
if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
ni->ni_macaddr, "data", "%s", "demic error");
vap->iv_stats.is_rx_demicfail++;
IEEE80211_NODE_STAT(ni, rx_demicfail);
goto out;
}
/* copy to listener after decrypt */
if (bpf_peers_present(vap->iv_rawbpf))
bpf_mtap(vap->iv_rawbpf, m);
need_tap = 0;
/*
* Finally, strip the 802.11 header.
*/
m = ieee80211_decap(vap, m, hdrspace);
if (m == NULL) {
/* XXX mask bit to check for both */
/* don't count Null data frames as errors */
if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
goto out;
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
ni->ni_macaddr, "data", "%s", "decap error");
vap->iv_stats.is_rx_decap++;
IEEE80211_NODE_STAT(ni, rx_decap);
goto err;
}
eh = mtod(m, struct ether_header *);
if (!ieee80211_node_is_authorized(ni)) {
/*
* Deny any non-PAE frames received prior to
* authorization. For open/shared-key
* authentication the port is mark authorized
* after authentication completes. For 802.1x
* the port is not marked authorized by the
* authenticator until the handshake has completed.
*/
if (eh->ether_type != htons(ETHERTYPE_PAE)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
eh->ether_shost, "data",
"unauthorized port: ether type 0x%x len %u",
eh->ether_type, m->m_pkthdr.len);
vap->iv_stats.is_rx_unauth++;
IEEE80211_NODE_STAT(ni, rx_unauth);
goto err;
}
} else {
/*
* When denying unencrypted frames, discard
* any non-PAE frames received without encryption.
*/
if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
(key == NULL && (m->m_flags & M_WEP) == 0) &&
eh->ether_type != htons(ETHERTYPE_PAE)) {
/*
* Drop unencrypted frames.
*/
vap->iv_stats.is_rx_unencrypted++;
IEEE80211_NODE_STAT(ni, rx_unencrypted);
goto out;
}
}
/* XXX require HT? */
if (qos & IEEE80211_QOS_AMSDU) {
m = ieee80211_decap_amsdu(ni, m);
if (m == NULL)
return IEEE80211_FC0_TYPE_DATA;
} else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF) &&
#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
m->m_pkthdr.len >= 3*FF_LLC_SIZE) {
struct llc *llc;
/*
* Check for fast-frame tunnel encapsulation.
*/
if (m->m_len < FF_LLC_SIZE &&
(m = m_pullup(m, FF_LLC_SIZE)) == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"%s", "m_pullup(llc) failed");
vap->iv_stats.is_rx_tooshort++;
return IEEE80211_FC0_TYPE_DATA;
}
llc = (struct llc *)(mtod(m, uint8_t *) +
sizeof(struct ether_header));
if (llc->llc_snap.ether_type == htons(ATH_FF_ETH_TYPE)) {
m_adj(m, FF_LLC_SIZE);
m = ieee80211_decap_fastframe(ni, m);
if (m == NULL)
return IEEE80211_FC0_TYPE_DATA;
}
}
#undef FF_LLC_SIZE
ieee80211_deliver_data(vap, ni, m);
return IEEE80211_FC0_TYPE_DATA;
case IEEE80211_FC0_TYPE_MGT:
vap->iv_stats.is_rx_mgmt++;
IEEE80211_NODE_STAT(ni, rx_mgmt);
if (dir != IEEE80211_FC1_DIR_NODS) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, "data", "incorrect dir 0x%x", dir);
vap->iv_stats.is_rx_wrongdir++;
goto err;
}
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "mgt", "too short: len %u",
m->m_pkthdr.len);
vap->iv_stats.is_rx_tooshort++;
goto out;
}
#ifdef IEEE80211_DEBUG
if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
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 (wh->i_fc[1] & IEEE80211_FC1_WEP) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL, "%s", "WEP set but not permitted");
vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
goto out;
}
if (bpf_peers_present(vap->iv_rawbpf))
bpf_mtap(vap->iv_rawbpf, m);
vap->iv_recv_mgmt(ni, m, subtype, rssi, noise, rstamp);
m_freem(m);
return IEEE80211_FC0_TYPE_MGT;
case IEEE80211_FC0_TYPE_CTL:
vap->iv_stats.is_rx_ctl++;
IEEE80211_NODE_STAT(ni, rx_ctrl);
goto out;
default:
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, "bad", "frame type 0x%x", type);
/* should not come here */
break;
}
err:
ifp->if_ierrors++;
out:
if (m != NULL) {
if (bpf_peers_present(vap->iv_rawbpf) && need_tap)
bpf_mtap(vap->iv_rawbpf, m);
m_freem(m);
}
return type;
#undef SEQ_LEQ
}
static void
wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
int subtype, int rssi, int noise, u_int32_t rstamp)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_frame *wh;
u_int8_t *frm, *efrm;
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_DEAUTH:
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
case IEEE80211_FC0_SUBTYPE_BEACON:
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
case IEEE80211_FC0_SUBTYPE_AUTH:
case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_DISASSOC:
vap->iv_stats.is_rx_mgtdiscard++;
break;
case IEEE80211_FC0_SUBTYPE_ACTION:
if (vap->iv_state != IEEE80211_S_RUN ||
IEEE80211_IS_MULTICAST(wh->i_addr1)) {
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
ni->ni_inact = ni->ni_inact_reload;
if (ieee80211_parse_action(ni, m0) == 0)
ic->ic_recv_action(ni, frm, efrm);
break;
default:
IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
wh, "mgt", "subtype 0x%x not handled", subtype);
vap->iv_stats.is_rx_badsubtype++;
break;
}
}
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