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freebsd-dev/sys/net80211/ieee80211_wds.c
Adrian Chadd 5cda6006e4 Bring over my initial work from the net80211 TX locking branch. 
This patchset implements a new TX lock, covering both the per-VAP (and
thus per-node) TX locking and the serialisation through to the underlying
physical device.

This implements the hard requirement that frames to the underlying physical
device are scheduled to the underlying device in the same order that they
are processed at the VAP layer.  This includes adding extra encapsulation
state (such as sequence numbers and CCMP IV numbers.)  Any order mismatch
here will result in dropped packets at the receiver.

There are multiple transmit contexts from the upper protocol layers as well
as the "raw" interface via the management and BPF transmit paths.
All of these need to be correctly serialised or bad behaviour will result
under load.

The specifics:

* add a new TX IC lock - it will eventually just be used for serialisation
  to the underlying physical device but for now it's used for both the
  VAP encapsulation/serialisation and the physical device dispatch.

  This lock is specifically non-recursive.

* Methodize the parent transmit, vap transmit and ic_raw_xmit function
  pointers; use lock assertions in the parent/vap transmit routines.

* Add a lock assertion in ieee80211_encap() - the TX lock must be held
  here to guarantee sensible behaviour.

* Refactor out the packet sending code from ieee80211_start() - now
  ieee80211_start() is just a loop over the ifnet queue and it dispatches
  each VAP packet send through ieee80211_start_pkt().

  Yes, I will likely rename ieee80211_start_pkt() to something that
  better reflects its status as a VAP packet transmit path.  More on
  that later.

* Add locking around the management and BAR TX sending - to ensure that
  encapsulation and TX are done hand-in-hand.

* Add locking in the mesh code - again, to ensure that encapsulation
  and mesh transmit are done hand-in-hand.

* Add locking around the power save queue and ageq handling, when
  dispatching to the parent interface.

* Add locking around the WDS handoff.

* Add a note in the mesh dispatch code that the TX path needs to be
  re-thought-out - right now it's doing a direct parent device transmit
  rather than going via the vap layer.  It may "work", but it's likely
  incorrect (as it bypasses any possible per-node power save and
  aggregation handling.)

Why not a per-VAP or per-node lock?

Because in order to ensure per-VAP ordering, we'd have to hold the
VAP lock across parent->if_transmit().  There are a few problems
with this:

* There's some state being setup during each driver transmit - specifically,
  the encryption encap / CCMP IV setup.  That should eventually be dragged
  back into the encapsulation phase but for now it lives in the driver TX path.
  This should be locked.

* Two drivers (ath, iwn) re-use the node->ni_txseqs array in order to
  allocate sequence numbers when doing transmit aggregation.  This should
  also be locked.

* Drivers may have multiple frames queued already - so when one calls
  if_transmit(), it may end up dispatching multiple frames for different
  VAPs/nodes, each needing a different lock when handling that particular
  end destination.

So to be "correct" locking-wise, we'd end up needing to grab a VAP or
node lock inside the driver TX path when setting up crypto / AMPDU sequence
numbers, and we may already _have_ a TX lock held - mostly for the same
destination vap/node, but sometimes it'll be for others.  That could lead
to LORs and thus deadlocks.

So for now, I'm sticking with an IC TX lock.  It has the advantage of
papering over the above and it also has the added advantage that I can
assert that it's being held when doing a parent device transmit.
I'll look at splitting the locks out a bit more later on.

General outstanding net80211 TX path issues / TODO:

* Look into separating out the VAP serialisation and the IC handoff.
  It's going to be tricky as parent->if_transmit() doesn't give me the
  opportunity to split queuing from driver dispatch.  See above.

* Work with monthadar to fix up the mesh transmit path so it doesn't go via
  the parent interface when retransmitting frames.

* Push the encryption handling back into the driver, if it's at all
  architectually sane to do so.  I know it's possible - it's what mac80211
  in Linux does.

* Make ieee80211_raw_xmit() queue a frame into VAP or parent queue rather
  than doing a short-cut direct into the driver.  There are QoS issues
  here - you do want your management frames to be encapsulated and pushed
  onto the stack sooner than the (large, bursty) amount of data frames
  that are queued.  But there has to be a saner way to do this.

* Fragments are still broken - drivers need to be upgraded to an if_transmit()
  implementation and then fragmentation handling needs to be properly fixed.

Tested:

* STA - AR5416, AR9280, Intel 5300 abgn wifi
* Hostap - AR5416, AR9160, AR9280
* Mesh - some testing by monthadar@, more to come.
2013-03-08 20:23:55 +00:00

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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>
#ifdef IEEE80211_SUPPORT_SUPERG
#include <net80211/ieee80211_superg.h>
#endif
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, int);
static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *,
int subtype, int, int);
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 void
wds_flush(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
struct mbuf *m, *next;
int8_t rssi, nf;
m = ieee80211_ageq_remove(&ic->ic_stageq,
(void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
if (m == NULL)
return;
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
"%s", "flush wds queue");
ic->ic_node_getsignal(ni, &rssi, &nf);
for (; m != NULL; m = next) {
next = m->m_nextpkt;
m->m_nextpkt = NULL;
ieee80211_input(ni, m, rssi, nf);
}
}
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 any pending frames now that were setup.
*/
if (ni != NULL)
wds_flush(ni);
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;
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.
*/
mcopy = m_copypacket(m, M_NOWAIT);
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;
}
/* calculate priority so drivers can find the tx queue */
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;
}
BPF_MTAP(ifp, m); /* 802.3 tx */
/*
* Encapsulate the packet in prep for transmission.
*/
mcopy = ieee80211_encap(vap, ni, mcopy);
if (mcopy == NULL) {
/* NB: stat+msg handled in ieee80211_encap */
ieee80211_free_node(ni);
continue;
}
mcopy->m_flags |= M_MCAST;
mcopy->m_pkthdr.rcvif = (void *) ni;
err = ieee80211_parent_transmit(ic, 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 ieee80211com *ic = ni->ni_ic;
/*
* Save the frame with an aging interval 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?
*/
m->m_pkthdr.rcvif = (void *)(uintptr_t)
ieee80211_mac_hash(ic, ni->ni_macaddr);
(void) ieee80211_ageq_append(&ic->ic_stageq, m,
((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
ieee80211_notify_wds_discover(ni);
}
/*
* 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 nf)
{
#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 = 1; /* mbuf need to be tapped. */
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"));
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 (!IEEE80211_IS_MULTICAST(wh->i_addr1))
ni->ni_inact = ni->ni_inact_reload;
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, fc %02x:%02x",
wh->i_fc[0], wh->i_fc[1]);
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 = nf;
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 (! ieee80211_check_rxseq(ni, wh)) {
/* 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;
}
/*
* 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 (ieee80211_radiotap_active_vap(vap))
ieee80211_radiotap_rx(vap, 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 {
#ifdef IEEE80211_SUPPORT_SUPERG
m = ieee80211_decap_fastframe(vap, ni, m);
if (m == NULL)
return IEEE80211_FC0_TYPE_DATA;
#endif
}
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;
}
vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
goto out;
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 (need_tap && ieee80211_radiotap_active_vap(vap))
ieee80211_radiotap_rx(vap, m);
m_freem(m);
}
return type;
}
static void
wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
int subtype, int rssi, int nf)
{
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_ACTION:
case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
if (ni == vap->iv_bss) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL, "%s", "unknown node");
vap->iv_stats.is_rx_mgtdiscard++;
} else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
/* NB: not interested in multicast frames. */
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL, "%s", "not for us");
vap->iv_stats.is_rx_mgtdiscard++;
} else if (vap->iv_state != IEEE80211_S_RUN) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL, "wrong state %s",
ieee80211_state_name[vap->iv_state]);
vap->iv_stats.is_rx_mgtdiscard++;
} else {
if (ieee80211_parse_action(ni, m0) == 0)
(void)ic->ic_recv_action(ni, wh, frm, efrm);
}
break;
case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
case IEEE80211_FC0_SUBTYPE_BEACON:
case IEEE80211_FC0_SUBTYPE_ATIM:
case IEEE80211_FC0_SUBTYPE_DISASSOC:
case IEEE80211_FC0_SUBTYPE_AUTH:
case IEEE80211_FC0_SUBTYPE_DEAUTH:
IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
wh, NULL, "%s", "not handled");
vap->iv_stats.is_rx_mgtdiscard++;
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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