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freebsd-dev/sys/net80211/ieee80211_wds.c
John Baldwin fb3bc59600 Restructure mbuf send tags to provide stronger guarantees. 
- Perform ifp mismatch checks (to determine if a send tag is allocated
  for a different ifp than the one the packet is being output on), in
  ip_output() and ip6_output().  This avoids sending packets with send
  tags to ifnet drivers that don't support send tags.

  Since we are now checking for ifp mismatches before invoking
  if_output, we can now try to allocate a new tag before invoking
  if_output sending the original packet on the new tag if allocation
  succeeds.

  To avoid code duplication for the fragment and unfragmented cases,
  add ip_output_send() and ip6_output_send() as wrappers around
  if_output and nd6_output_ifp, respectively.  All of the logic for
  setting send tags and dealing with send tag-related errors is done
  in these wrapper functions.

  For pseudo interfaces that wrap other network interfaces (vlan and
  lagg), wrapper send tags are now allocated so that ip*_output see
  the wrapper ifp as the ifp in the send tag.  The if_transmit
  routines rewrite the send tags after performing an ifp mismatch
  check.  If an ifp mismatch is detected, the transmit routines fail
  with EAGAIN.

- To provide clearer life cycle management of send tags, especially
  in the presence of vlan and lagg wrapper tags, add a reference count
  to send tags managed via m_snd_tag_ref() and m_snd_tag_rele().
  Provide a helper function (m_snd_tag_init()) for use by drivers
  supporting send tags.  m_snd_tag_init() takes care of the if_ref
  on the ifp meaning that code alloating send tags via if_snd_tag_alloc
  no longer has to manage that manually.  Similarly, m_snd_tag_rele
  drops the refcount on the ifp after invoking if_snd_tag_free when
  the last reference to a send tag is dropped.

  This also closes use after free races if there are pending packets in
  driver tx rings after the socket is closed (e.g. from tcpdrop).

  In order for m_free to work reliably, add a new CSUM_SND_TAG flag in
  csum_flags to indicate 'snd_tag' is set (rather than 'rcvif').
  Drivers now also check this flag instead of checking snd_tag against
  NULL.  This avoids false positive matches when a forwarded packet
  has a non-NULL rcvif that was treated as a send tag.

- cxgbe was relying on snd_tag_free being called when the inp was
  detached so that it could kick the firmware to flush any pending
  work on the flow.  This is because the driver doesn't require ACK
  messages from the firmware for every request, but instead does a
  kind of manual interrupt coalescing by only setting a flag to
  request a completion on a subset of requests.  If all of the
  in-flight requests don't have the flag when the tag is detached from
  the inp, the flow might never return the credits.  The current
  snd_tag_free command issues a flush command to force the credits to
  return.  However, the credit return is what also frees the mbufs,
  and since those mbufs now hold references on the tag, this meant
  that snd_tag_free would never be called.

  To fix, explicitly drop the mbuf's reference on the snd tag when the
  mbuf is queued in the firmware work queue.  This means that once the
  inp's reference on the tag goes away and all in-flight mbufs have
  been queued to the firmware, tag's refcount will drop to zero and
  snd_tag_free will kick in and send the flush request.  Note that we
  need to avoid doing this in the middle of ethofld_tx(), so the
  driver grabs a temporary reference on the tag around that loop to
  defer the free to the end of the function in case it sends the last
  mbuf to the queue after the inp has dropped its reference on the
  tag.

- mlx5 preallocates send tags and was using the ifp pointer even when
  the send tag wasn't in use.  Explicitly use the ifp from other data
  structures instead.

- Sprinkle some assertions in various places to assert that received
  packets don't have a send tag, and that other places that overwrite
  rcvif (e.g. 802.11 transmit) don't clobber a send tag pointer.

Reviewed by:	gallatin, hselasky, rgrimes, ae
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D20117
2019-05-24 22:30:40 +00:00

801 lines
23 KiB
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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_var.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,
const struct ieee80211_rx_stats *rxs, int, int);
static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
const struct ieee80211_rx_stats *, 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) {
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
/* XXX stat + msg */
continue;
}
ni = ieee80211_find_txnode(vap, eh->ether_dhost);
if (ni == NULL) {
/* NB: ieee80211_find_txnode does stat+msg */
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
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++;
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
m_freem(mcopy);
ieee80211_free_node(ni);
continue;
}
BPF_MTAP(ifp, m); /* 802.3 tx */
/*
* Encapsulate the packet in prep for transmission.
*/
IEEE80211_TX_LOCK(ic);
mcopy = ieee80211_encap(vap, ni, mcopy);
if (mcopy == NULL) {
/* NB: stat+msg handled in ieee80211_encap */
IEEE80211_TX_UNLOCK(ic);
ieee80211_free_node(ni);
continue;
}
mcopy->m_flags |= M_MCAST;
MPASS((mcopy->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
mcopy->m_pkthdr.rcvif = (void *) ni;
err = ieee80211_parent_xmitpkt(ic, mcopy);
IEEE80211_TX_UNLOCK(ic);
if (!err) {
if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
if_inc_counter(ifp, IFCOUNTER_OBYTES,
m->m_pkthdr.len);
}
}
}
/*
* 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?
*/
MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
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;
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 */
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,
const struct ieee80211_rx_stats *rxs, int rssi, int nf)
{
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;
int is_hw_decrypted = 0;
int has_decrypted = 0;
/*
* Some devices do hardware decryption all the way through
* to pretending the frame wasn't encrypted in the first place.
* So, tag it appropriately so it isn't discarded inappropriately.
*/
if ((rxs != NULL) && (rxs->c_pktflags & IEEE80211_RX_F_DECRYPTED))
is_hw_decrypted = 1;
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 (IEEE80211_HAS_SEQ(type, subtype)) {
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++;
if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1, rxs))
goto out;
}
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, rxs) != 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 (is_hw_decrypted || wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
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;
}
if (ieee80211_crypto_decap(ni, m, hdrspace, &key) == 0) {
/* 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_PROTECTED;
has_decrypted = 1;
} 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 = ieee80211_getqos(wh)[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 (!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) &&
((has_decrypted == 0) && (m->m_flags & M_WEP) == 0) &&
(is_hw_decrypted == 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),
ether_sprintf(wh->i_addr2), rssi);
}
#endif
if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
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, rxs, 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:
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
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,
const struct ieee80211_rx_stats *rxs, 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_TIMING_ADV:
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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