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freebsd/sys/net80211/ieee80211_input.c
Sam Leffler 68e8e04e93 Update 802.11 wireless support: 
o major overhaul of the way channels are handled: channels are now
  fully enumerated and uniquely identify the operating characteristics;
  these changes are visible to user applications which require changes
o make scanning support independent of the state machine to enable
  background scanning and roaming
o move scanning support into loadable modules based on the operating
  mode to enable different policies and reduce the memory footprint
  on systems w/ constrained resources
o add background scanning in station mode (no support for adhoc/ibss
  mode yet)
o significantly speedup sta mode scanning with a variety of techniques
o add roaming support when background scanning is supported; for now
  we use a simple algorithm to trigger a roam: we threshold the rssi
  and tx rate, if either drops too low we try to roam to a new ap
o add tx fragmentation support
o add first cut at 802.11n support: this code works with forthcoming
  drivers but is incomplete; it's included now to establish a baseline
  for other drivers to be developed and for user applications
o adjust max_linkhdr et. al. to reflect 802.11 requirements; this eliminates
  prepending mbufs for traffic generated locally
o add support for Atheros protocol extensions; mainly the fast frames
  encapsulation (note this can be used with any card that can tx+rx
  large frames correctly)
o add sta support for ap's that beacon both WPA1+2 support
o change all data types from bsd-style to posix-style
o propagate noise floor data from drivers to net80211 and on to user apps
o correct various issues in the sta mode state machine related to handling
  authentication and association failures
o enable the addition of sta mode power save support for drivers that need
  net80211 support (not in this commit)
o remove old WI compatibility ioctls (wicontrol is officially dead)
o change the data structures returned for get sta info and get scan
  results so future additions will not break user apps
o fixed tx rate is now maintained internally as an ieee rate and not an
  index into the rate set; this needs to be extended to deal with
  multi-mode operation
o add extended channel specifications to radiotap to enable 11n sniffing

Drivers:
o ath: add support for bg scanning, tx fragmentation, fast frames,
       dynamic turbo (lightly tested), 11n (sniffing only and needs
       new hal)
o awi: compile tested only
o ndis: lightly tested
o ipw: lightly tested
o iwi: add support for bg scanning (well tested but may have some
       rough edges)
o ral, ural, rum: add suppoort for bg scanning, calibrate rssi data
o wi: lightly tested

This work is based on contributions by Atheros, kmacy, sephe, thompsa,
mlaier, kevlo, and others.  Much of the scanning work was supported by
Atheros.  The 11n work was supported by Marvell.
2007-06-11 03:36:55 +00:00

3333 lines
94 KiB
C
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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2007 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 <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/if.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net/if_llc.h>
#include <net/if_vlan_var.h>
#include <net80211/ieee80211_var.h>
#include <net/bpf.h>
#ifdef IEEE80211_DEBUG
#include <machine/stdarg.h>
/*
* Decide if a received management frame should be
* printed when debugging is enabled. This filters some
* of the less interesting frames that come frequently
* (e.g. beacons).
*/
static __inline int
doprint(struct ieee80211com *ic, int subtype)
{
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_BEACON:
return (ic->ic_flags & IEEE80211_F_SCAN);
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
return (ic->ic_opmode == IEEE80211_M_IBSS);
}
return 1;
}
static const uint8_t *ieee80211_getbssid(struct ieee80211com *,
const struct ieee80211_frame *);
#endif /* IEEE80211_DEBUG */
static struct mbuf *ieee80211_defrag(struct ieee80211com *,
struct ieee80211_node *, struct mbuf *, int);
static struct mbuf *ieee80211_decap(struct ieee80211com *, struct mbuf *, int);
static void ieee80211_send_error(struct ieee80211com *, struct ieee80211_node *,
const uint8_t *mac, int subtype, int arg);
static struct mbuf *ieee80211_decap_fastframe(struct ieee80211com *,
struct ieee80211_node *, struct mbuf *);
static void ieee80211_recv_pspoll(struct ieee80211com *,
struct ieee80211_node *, struct mbuf *);
/*
* Process a received frame. The node associated with the sender
* should be supplied. If nothing was found in the node table then
* the caller is assumed to supply a reference to ic_bss instead.
* The RSSI and a timestamp are also supplied. The RSSI data is used
* during AP scanning to select a AP to associate with; it can have
* any units so long as values have consistent units and higher values
* mean ``better signal''. The receive timestamp is currently not used
* by the 802.11 layer.
*/
int
ieee80211_input(struct ieee80211com *ic, struct mbuf *m,
struct ieee80211_node *ni, int rssi, int noise, uint32_t rstamp)
{
#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
#define HAS_SEQ(type) ((type & 0x4) == 0)
struct ifnet *ifp = ic->ic_ifp;
struct ieee80211_frame *wh;
struct ieee80211_key *key;
struct ether_header *eh;
int hdrspace, need_tap;
uint8_t dir, type, subtype, qos;
uint8_t *bssid;
uint16_t rxseq;
if (m->m_flags & M_AMPDU) {
/*
* Fastpath for A-MPDU reorder q resubmission. Frames
* w/ M_AMPDU 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 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? */
need_tap = 0;
goto resubmit_ampdu;
}
KASSERT(ni != NULL, ("null node"));
ni->ni_inact = ni->ni_inact_reload;
need_tap = 1; /* mbuf need to be tapped. */
type = -1; /* undefined */
/*
* In monitor mode, send everything directly to bpf.
* XXX may want to include the CRC
*/
if (ic->ic_opmode == IEEE80211_M_MONITOR)
goto out;
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL,
"too short (1): len %u", m->m_pkthdr.len);
ic->ic_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(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL, "wrong version %x", wh->i_fc[0]);
ic->ic_stats.is_rx_badversion++;
goto err;
}
dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
bssid = wh->i_addr2;
if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) {
/* not interested in */
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT,
bssid, NULL, "%s", "not to bss");
ic->ic_stats.is_rx_wrongbss++;
goto out;
}
break;
case IEEE80211_M_IBSS:
case IEEE80211_M_AHDEMO:
case IEEE80211_M_HOSTAP:
if (dir != IEEE80211_FC1_DIR_NODS)
bssid = wh->i_addr1;
else if (type == IEEE80211_FC0_TYPE_CTL)
bssid = wh->i_addr1;
else {
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
IEEE80211_DISCARD_MAC(ic,
IEEE80211_MSG_ANY, ni->ni_macaddr,
NULL, "too short (2): len %u",
m->m_pkthdr.len);
ic->ic_stats.is_rx_tooshort++;
goto out;
}
bssid = wh->i_addr3;
}
if (type != IEEE80211_FC0_TYPE_DATA)
break;
/*
* Data frame, validate the bssid.
*/
if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) &&
!IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
/* not interested in */
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT,
bssid, NULL, "%s", "not to bss");
ic->ic_stats.is_rx_wrongbss++;
goto out;
}
/*
* For adhoc mode we cons up a node when it doesn't
* exist. This should probably done after an ACL check.
*/
if (ni == ic->ic_bss &&
ic->ic_opmode != IEEE80211_M_HOSTAP &&
!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
/*
* Fake up a node for this newly
* discovered member of the IBSS.
*/
ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta,
wh->i_addr2);
if (ni == NULL) {
/* NB: stat kept for alloc failure */
goto err;
}
}
break;
default:
goto out;
}
ni->ni_rssi = rssi;
ni->ni_noise = noise;
ni->ni_rstamp = rstamp;
if (HAS_SEQ(type)) {
uint8_t tid;
if (IEEE80211_QOS_HAS_SEQ(wh)) {
tid = ((struct ieee80211_qosframe *)wh)->
i_qos[0] & IEEE80211_QOS_TID;
if (TID_TO_WME_AC(tid) >= WME_AC_VI)
ic->ic_wme.wme_hipri_traffic++;
tid++;
} else
tid = IEEE80211_NONQOS_TID;
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(ic, IEEE80211_MSG_INPUT,
bssid, "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);
ic->ic_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(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, NULL,
"data too short: expecting %u", hdrspace);
ic->ic_stats.is_rx_tooshort++;
goto out; /* XXX */
}
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
if (dir != IEEE80211_FC1_DIR_FROMDS) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "unknown dir 0x%x", dir);
ic->ic_stats.is_rx_wrongdir++;
goto out;
}
if ((ifp->if_flags & IFF_SIMPLEX) &&
IEEE80211_IS_MULTICAST(wh->i_addr1) &&
IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) {
/*
* In IEEE802.11 network, multicast packet
* sent from me is broadcasted from AP.
* It should be silently discarded for
* SIMPLEX interface.
*/
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, NULL, "%s", "multicast echo");
ic->ic_stats.is_rx_mcastecho++;
goto out;
}
break;
case IEEE80211_M_IBSS:
case IEEE80211_M_AHDEMO:
if (dir != IEEE80211_FC1_DIR_NODS) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "unknown dir 0x%x", dir);
ic->ic_stats.is_rx_wrongdir++;
goto out;
}
/* XXX no power-save support */
break;
case IEEE80211_M_HOSTAP:
if (dir != IEEE80211_FC1_DIR_TODS) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "unknown dir 0x%x", dir);
ic->ic_stats.is_rx_wrongdir++;
goto out;
}
/* check if source STA is associated */
if (ni == ic->ic_bss) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "%s", "unknown src");
ieee80211_send_error(ic, ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_NOT_AUTHED);
ic->ic_stats.is_rx_notassoc++;
goto err;
}
if (ni->ni_associd == 0) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "%s", "unassoc src");
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DISASSOC,
IEEE80211_REASON_NOT_ASSOCED);
ic->ic_stats.is_rx_notassoc++;
goto err;
}
/*
* Check for power save state change.
* XXX out-of-order A-MPDU frames?
*/
if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^
(ni->ni_flags & IEEE80211_NODE_PWR_MGT)))
ieee80211_node_pwrsave(ni,
wh->i_fc[1] & IEEE80211_FC1_PWR_MGT);
break;
default:
/* XXX here to keep compiler happy */
goto out;
}
/*
* Handle A-MPDU re-ordering. The station must be
* associated and negotiated HT. The frame must be
* a QoS frame (not QoS null data) and not previously
* processed for 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 ((ni->ni_flags & IEEE80211_NODE_HT) &&
subtype == IEEE80211_FC0_SUBTYPE_QOS &&
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 ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) {
/*
* Discard encrypted frames when privacy is off.
*/
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "WEP", "%s", "PRIVACY off");
ic->ic_stats.is_rx_noprivacy++;
IEEE80211_NODE_STAT(ni, rx_noprivacy);
goto out;
}
key = ieee80211_crypto_decap(ic, 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 {
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(ic, 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(ic, key, m, 0)) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT,
ni->ni_macaddr, "data", "%s", "demic error");
ic->ic_stats.is_rx_demicfail++;
IEEE80211_NODE_STAT(ni, rx_demicfail);
goto out;
}
/* copy to listener after decrypt */
if (bpf_peers_present(ic->ic_rawbpf))
bpf_mtap(ic->ic_rawbpf, m);
need_tap = 0;
/*
* Finally, strip the 802.11 header.
*/
m = ieee80211_decap(ic, m, hdrspace);
if (m == NULL) {
/* 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(ic, IEEE80211_MSG_INPUT,
ni->ni_macaddr, "data", "%s", "decap error");
ic->ic_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(ic, IEEE80211_MSG_INPUT,
eh->ether_shost, "data",
"unauthorized port: ether type 0x%x len %u",
eh->ether_type, m->m_pkthdr.len);
ic->ic_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 ((ic->ic_flags & IEEE80211_F_DROPUNENC) &&
key == NULL &&
eh->ether_type != htons(ETHERTYPE_PAE)) {
/*
* Drop unencrypted frames.
*/
ic->ic_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 ((ni->ni_ath_flags & 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(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"%s", "m_pullup(llc) failed");
ic->ic_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(ic, ni, m);
if (m == NULL)
return IEEE80211_FC0_TYPE_DATA;
}
}
#undef FF_LLC_SIZE
ieee80211_deliver_data(ic, ni, m);
return IEEE80211_FC0_TYPE_DATA;
case IEEE80211_FC0_TYPE_MGT:
ic->ic_stats.is_rx_mgmt++;
IEEE80211_NODE_STAT(ni, rx_mgmt);
if (dir != IEEE80211_FC1_DIR_NODS) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "unknown dir 0x%x", dir);
ic->ic_stats.is_rx_wrongdir++;
goto err;
}
if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, "mgt", "too short: len %u",
m->m_pkthdr.len);
ic->ic_stats.is_rx_tooshort++;
goto out;
}
#ifdef IEEE80211_DEBUG
if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) ||
ieee80211_msg_dumppkts(ic)) {
if_printf(ic->ic_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) {
if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) {
/*
* Only shared key auth frames with a challenge
* should be encrypted, discard all others.
*/
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "WEP set but not permitted");
ic->ic_stats.is_rx_mgtdiscard++; /* XXX */
goto out;
}
if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) {
/*
* Discard encrypted frames when privacy is off.
*/
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "mgt", "%s", "WEP set but PRIVACY off");
ic->ic_stats.is_rx_noprivacy++;
goto out;
}
hdrspace = ieee80211_hdrspace(ic, wh);
key = ieee80211_crypto_decap(ic, ni, m, hdrspace);
if (key == NULL) {
/* NB: stats+msgs handled in crypto_decap */
goto out;
}
wh = mtod(m, struct ieee80211_frame *);
wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
}
if (bpf_peers_present(ic->ic_rawbpf))
bpf_mtap(ic->ic_rawbpf, m);
(*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, noise, rstamp);
m_freem(m);
return IEEE80211_FC0_TYPE_MGT;
case IEEE80211_FC0_TYPE_CTL:
ic->ic_stats.is_rx_ctl++;
IEEE80211_NODE_STAT(ni, rx_ctrl);
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_PS_POLL:
ieee80211_recv_pspoll(ic, ni, m);
break;
case IEEE80211_FC0_SUBTYPE_BAR:
ieee80211_recv_bar(ni, m);
break;
}
}
goto out;
default:
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
wh, NULL, "bad frame type 0x%x", type);
/* should not come here */
break;
}
err:
ifp->if_ierrors++;
out:
if (m != NULL) {
if (bpf_peers_present(ic->ic_rawbpf) && need_tap)
bpf_mtap(ic->ic_rawbpf, m);
m_freem(m);
}
return type;
#undef SEQ_LEQ
}
/*
* This function reassemble fragments.
*/
static struct mbuf *
ieee80211_defrag(struct ieee80211com *ic, struct ieee80211_node *ni,
struct mbuf *m, int hdrspace)
{
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 */
ic->ic_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 ieee80211com *ic,
struct ieee80211_node *ni, struct mbuf *m)
{
struct ether_header *eh = mtod(m, struct ether_header *);
struct ifnet *ifp = ic->ic_ifp;
/*
* 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);
/* perform as a bridge within the AP */
if (ic->ic_opmode == IEEE80211_M_HOSTAP &&
(ic->ic_flags & IEEE80211_F_NOBRIDGE) == 0) {
struct mbuf *m1 = NULL;
if (m->m_flags & M_MCAST) {
m1 = m_dup(m, M_DONTWAIT);
if (m1 == NULL)
ifp->if_oerrors++;
else
m1->m_flags |= M_MCAST;
} else {
/*
* Check if the destination is known; if so
* and the port is authorized dispatch directly.
*/
struct ieee80211_node *sta =
ieee80211_find_node(&ic->ic_sta, eh->ether_dhost);
if (sta != NULL) {
if (ieee80211_node_is_authorized(sta)) {
/*
* Beware of sending to ourself; this
* needs to happen via the normal
* input path.
*/
if (sta != ic->ic_bss) {
m1 = m;
m = NULL;
}
} else {
ic->ic_stats.is_rx_unauth++;
IEEE80211_NODE_STAT(sta, rx_unauth);
}
ieee80211_free_node(sta);
}
}
if (m1 != NULL)
(void) IF_HANDOFF(&ifp->if_snd, m1, ifp);
}
if (m != NULL) {
m->m_pkthdr.rcvif = ifp;
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);
}
}
static struct mbuf *
ieee80211_decap(struct ieee80211com *ic, 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) {
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.
*/
static struct mbuf *
ieee80211_decap_fastframe(struct ieee80211com *ic,
struct ieee80211_node *ni, struct mbuf *m)
{
#define MS(x,f) (((x) & f) >> f##_S)
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(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"unsupport tunnel protocol, header 0x%x", ath);
ic->ic_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);
ic->ic_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(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
ic->ic_stats.is_ff_tooshort++;
return NULL;
}
n = m_split(m, framelen, M_NOWAIT);
if (n == NULL) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame",
"%s", "unable to split encapsulated frames");
ic->ic_stats.is_ff_split++;
m_freem(m); /* NB: must reclaim */
return NULL;
}
ieee80211_deliver_data(ic, 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(ic, IEEE80211_MSG_ANY,
ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
ic->ic_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 ieee80211com *ic = ni->ni_ic;
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_DPRINTF(ic, IEEE80211_MSG_XRATE,
"[%s] extended rate set too large;"
" only using %u of %u rates\n",
ether_sprintf(ni->ni_macaddr), nxrates, xrates[1]);
ic->ic_stats.is_rx_rstoobig++;
}
memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
rs->rs_nrates += nxrates;
}
return ieee80211_fix_rate(ni, rs, flags);
}
static void
ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh,
struct ieee80211_node *ni, int rssi, int noise, uint32_t rstamp,
uint16_t seq, uint16_t status)
{
if (ni->ni_authmode == IEEE80211_AUTH_SHARED) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "open auth",
"bad sta auth mode %u", ni->ni_authmode);
ic->ic_stats.is_rx_bad_auth++; /* XXX */
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
/*
* Clear any challenge text that may be there if
* a previous shared key auth failed and then an
* open auth is attempted.
*/
if (ni->ni_challenge != NULL) {
FREE(ni->ni_challenge, M_80211_NODE);
ni->ni_challenge = NULL;
}
/* XXX hack to workaround calling convention */
ieee80211_send_error(ic, ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq + 1) | (IEEE80211_STATUS_ALG<<16));
}
return;
}
switch (ic->ic_opmode) {
case IEEE80211_M_IBSS:
case IEEE80211_M_AHDEMO:
case IEEE80211_M_MONITOR:
case IEEE80211_M_WDS:
/* should not come here */
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "open auth",
"bad operating mode %u", ic->ic_opmode);
break;
case IEEE80211_M_HOSTAP:
if (ic->ic_state != IEEE80211_S_RUN ||
seq != IEEE80211_AUTH_OPEN_REQUEST) {
ic->ic_stats.is_rx_bad_auth++;
return;
}
/* always accept open authentication requests */
if (ni == ic->ic_bss) {
ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);
if (ni == NULL)
return;
} else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
(void) ieee80211_ref_node(ni);
/*
* Mark the node as referenced to reflect that it's
* reference count has been bumped to insure it remains
* after the transaction completes.
*/
ni->ni_flags |= IEEE80211_NODE_AREF;
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] station authenticated (open)\n",
ether_sprintf(ni->ni_macaddr));
/*
* When 802.1x is not in use mark the port
* authorized at this point so traffic can flow.
*/
if (ni->ni_authmode != IEEE80211_AUTH_8021X)
ieee80211_node_authorize(ni);
break;
case IEEE80211_M_STA:
if (ic->ic_state != IEEE80211_S_AUTH ||
seq != IEEE80211_AUTH_OPEN_RESPONSE) {
ic->ic_stats.is_rx_bad_auth++;
return;
}
if (status != 0) {
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] open auth failed (reason %d)\n",
ether_sprintf(ni->ni_macaddr), status);
/* XXX can this happen? */
if (ni != ic->ic_bss)
ni->ni_fails++;
ic->ic_stats.is_rx_auth_fail++;
ieee80211_new_state(ic, IEEE80211_S_SCAN,
IEEE80211_SCAN_FAIL_STATUS);
} else
ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0);
break;
}
}
/*
* 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.
*/
static void
ieee80211_send_error(struct ieee80211com *ic, struct ieee80211_node *ni,
const uint8_t *mac, int subtype, int arg)
{
int istmp;
if (ni == ic->ic_bss) {
ni = ieee80211_tmp_node(ic, mac);
if (ni == NULL) {
/* XXX msg */
return;
}
istmp = 1;
} else
istmp = 0;
IEEE80211_SEND_MGMT(ic, ni, subtype, arg);
if (istmp)
ieee80211_free_node(ni);
}
static int
alloc_challenge(struct ieee80211com *ic, 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_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] shared key challenge alloc failed\n",
ether_sprintf(ni->ni_macaddr));
/* XXX statistic */
}
return (ni->ni_challenge != NULL);
}
/* XXX TODO: add statistics */
static void
ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh,
uint8_t *frm, uint8_t *efrm, struct ieee80211_node *ni,
int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status)
{
uint8_t *challenge;
int allocbs, estatus;
/*
* NB: this can happen as we allow pre-shared key
* authentication to be enabled w/o wep being turned
* on so that configuration of these can be done
* in any order. It may be better to enforce the
* ordering in which case this check would just be
* for sanity/consistency.
*/
if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"%s", " PRIVACY is disabled");
estatus = IEEE80211_STATUS_ALG;
goto bad;
}
/*
* Pre-shared key authentication is evil; accept
* it only if explicitly configured (it is supported
* mainly for compatibility with clients like OS X).
*/
if (ni->ni_authmode != IEEE80211_AUTH_AUTO &&
ni->ni_authmode != IEEE80211_AUTH_SHARED) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad sta auth mode %u", ni->ni_authmode);
ic->ic_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */
estatus = IEEE80211_STATUS_ALG;
goto bad;
}
challenge = NULL;
if (frm + 1 < efrm) {
if ((frm[1] + 2) > (efrm - frm)) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"ie %d/%d too long",
frm[0], (frm[1] + 2) - (efrm - frm));
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
if (*frm == IEEE80211_ELEMID_CHALLENGE)
challenge = frm;
frm += frm[1] + 2;
}
switch (seq) {
case IEEE80211_AUTH_SHARED_CHALLENGE:
case IEEE80211_AUTH_SHARED_RESPONSE:
if (challenge == NULL) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"%s", "no challenge");
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
if (challenge[1] != IEEE80211_CHALLENGE_LEN) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad challenge len %d", challenge[1]);
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
default:
break;
}
switch (ic->ic_opmode) {
case IEEE80211_M_MONITOR:
case IEEE80211_M_AHDEMO:
case IEEE80211_M_IBSS:
case IEEE80211_M_WDS:
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad operating mode %u", ic->ic_opmode);
return;
case IEEE80211_M_HOSTAP:
if (ic->ic_state != IEEE80211_S_RUN) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad state %u", ic->ic_state);
estatus = IEEE80211_STATUS_ALG; /* XXX */
goto bad;
}
switch (seq) {
case IEEE80211_AUTH_SHARED_REQUEST:
if (ni == ic->ic_bss) {
ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2);
if (ni == NULL) {
/* NB: no way to return an error */
return;
}
allocbs = 1;
} else {
if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0)
(void) ieee80211_ref_node(ni);
allocbs = 0;
}
/*
* Mark the node as referenced to reflect that it's
* reference count has been bumped to insure it remains
* after the transaction completes.
*/
ni->ni_flags |= IEEE80211_NODE_AREF;
ni->ni_rssi = rssi;
ni->ni_noise = noise;
ni->ni_rstamp = rstamp;
if (!alloc_challenge(ic, ni)) {
/* NB: don't return error so they rexmit */
return;
}
get_random_bytes(ni->ni_challenge,
IEEE80211_CHALLENGE_LEN);
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] shared key %sauth request\n",
ether_sprintf(ni->ni_macaddr),
allocbs ? "" : "re");
break;
case IEEE80211_AUTH_SHARED_RESPONSE:
if (ni == ic->ic_bss) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key response",
"%s", "unknown station");
/* NB: don't send a response */
return;
}
if (ni->ni_challenge == NULL) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key response",
"%s", "no challenge recorded");
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
if (memcmp(ni->ni_challenge, &challenge[2],
challenge[1]) != 0) {
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key response",
"%s", "challenge mismatch");
ic->ic_stats.is_rx_auth_fail++;
estatus = IEEE80211_STATUS_CHALLENGE;
goto bad;
}
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] station authenticated (shared key)\n",
ether_sprintf(ni->ni_macaddr));
ieee80211_node_authorize(ni);
break;
default:
IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH,
ni->ni_macaddr, "shared key auth",
"bad seq %d", seq);
ic->ic_stats.is_rx_bad_auth++;
estatus = IEEE80211_STATUS_SEQUENCE;
goto bad;
}
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
break;
case IEEE80211_M_STA:
if (ic->ic_state != IEEE80211_S_AUTH)
return;
switch (seq) {
case IEEE80211_AUTH_SHARED_PASS:
if (ni->ni_challenge != NULL) {
FREE(ni->ni_challenge, M_80211_NODE);
ni->ni_challenge = NULL;
}
if (status != 0) {
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH,
"[%s] shared key auth failed (reason %d)\n",
ether_sprintf(ieee80211_getbssid(ic, wh)),
status);
/* XXX can this happen? */
if (ni != ic->ic_bss)
ni->ni_fails++;
ic->ic_stats.is_rx_auth_fail++;
return;
}
ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0);
break;
case IEEE80211_AUTH_SHARED_CHALLENGE:
if (!alloc_challenge(ic, ni))
return;
/* XXX could optimize by passing recvd challenge */
memcpy(ni->ni_challenge, &challenge[2], challenge[1]);
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH, seq + 1);
break;
default:
IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH,
wh, "shared key auth", "bad seq %d", seq);
ic->ic_stats.is_rx_bad_auth++;
return;
}
break;
}
return;
bad:
/*
* Send an error response; but only when operating as an AP.
*/
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
/* XXX hack to workaround calling convention */
ieee80211_send_error(ic, ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq + 1) | (estatus<<16));
} else if (ic->ic_opmode == IEEE80211_M_STA) {
/*
* Kick the state machine. This short-circuits
* using the mgt frame timeout to trigger the
* state transition.
*/
if (ic->ic_state == IEEE80211_S_AUTH)
ieee80211_new_state(ic, IEEE80211_S_SCAN,
IEEE80211_SCAN_FAIL_STATUS);
}
}
/* Verify the existence and length of __elem or get out. */
#define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \
if ((__elem) == NULL) { \
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \
wh, ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
"%s", "no " #__elem ); \
ic->ic_stats.is_rx_elem_missing++; \
return; \
} \
if ((__elem)[1] > (__maxlen)) { \
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \
wh, ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
"bad " #__elem " len %d", (__elem)[1]); \
ic->ic_stats.is_rx_elem_toobig++; \
return; \
} \
} while (0)
#define IEEE80211_VERIFY_LENGTH(_len, _minlen, _action) do { \
if ((_len) < (_minlen)) { \
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \
wh, ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
"ie too short, got %d, expected %d", \
(_len), (_minlen)); \
ic->ic_stats.is_rx_elem_toosmall++; \
_action; \
} \
} while (0)
#ifdef IEEE80211_DEBUG
static void
ieee80211_ssid_mismatch(struct ieee80211com *ic, 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");
}
#define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \
if ((_ssid)[1] != 0 && \
((_ssid)[1] != (_ni)->ni_esslen || \
memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \
if (ieee80211_msg_input(ic)) \
ieee80211_ssid_mismatch(ic, \
ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
wh->i_addr2, _ssid); \
ic->ic_stats.is_rx_ssidmismatch++; \
return; \
} \
} while (0)
#else /* !IEEE80211_DEBUG */
#define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \
if ((_ssid)[1] != 0 && \
((_ssid)[1] != (_ni)->ni_esslen || \
memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \
ic->ic_stats.is_rx_ssidmismatch++; \
return; \
} \
} while (0)
#endif /* !IEEE80211_DEBUG */
/* unalligned little endian access */
#define LE_READ_2(p) \
((uint16_t) \
((((const uint8_t *)(p))[0] ) | \
(((const uint8_t *)(p))[1] << 8)))
#define LE_READ_4(p) \
((uint32_t) \
((((const uint8_t *)(p))[0] ) | \
(((const uint8_t *)(p))[1] << 8) | \
(((const uint8_t *)(p))[2] << 16) | \
(((const uint8_t *)(p))[3] << 24)))
static __inline int
iswpaoui(const uint8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
}
static __inline int
iswmeoui(const uint8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI);
}
static __inline int
iswmeparam(const uint8_t *frm)
{
return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
frm[6] == WME_PARAM_OUI_SUBTYPE;
}
static __inline int
iswmeinfo(const uint8_t *frm)
{
return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
frm[6] == WME_INFO_OUI_SUBTYPE;
}
static __inline int
isatherosoui(const uint8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
}
static __inline int
ishtcapoui(const uint8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI);
}
static __inline int
ishtinfooui(const uint8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI);
}
/*
* Convert a WPA cipher selector OUI to an internal
* cipher algorithm. Where appropriate we also
* record any key length.
*/
static int
wpa_cipher(uint8_t *sel, uint8_t *keylen)
{
#define WPA_SEL(x) (((x)<<24)|WPA_OUI)
uint32_t w = LE_READ_4(sel);
switch (w) {
case WPA_SEL(WPA_CSE_NULL):
return IEEE80211_CIPHER_NONE;
case WPA_SEL(WPA_CSE_WEP40):
if (keylen)
*keylen = 40 / NBBY;
return IEEE80211_CIPHER_WEP;
case WPA_SEL(WPA_CSE_WEP104):
if (keylen)
*keylen = 104 / NBBY;
return IEEE80211_CIPHER_WEP;
case WPA_SEL(WPA_CSE_TKIP):
return IEEE80211_CIPHER_TKIP;
case WPA_SEL(WPA_CSE_CCMP):
return IEEE80211_CIPHER_AES_CCM;
}
return 32; /* NB: so 1<< is discarded */
#undef WPA_SEL
}
/*
* Convert a WPA key management/authentication algorithm
* to an internal code.
*/
static int
wpa_keymgmt(uint8_t *sel)
{
#define WPA_SEL(x) (((x)<<24)|WPA_OUI)
uint32_t w = LE_READ_4(sel);
switch (w) {
case WPA_SEL(WPA_ASE_8021X_UNSPEC):
return WPA_ASE_8021X_UNSPEC;
case WPA_SEL(WPA_ASE_8021X_PSK):
return WPA_ASE_8021X_PSK;
case WPA_SEL(WPA_ASE_NONE):
return WPA_ASE_NONE;
}
return 0; /* NB: so is discarded */
#undef WPA_SEL
}
/*
* Parse a WPA information element to collect parameters
* and validate the parameters against what has been
* configured for the system.
*/
static int
ieee80211_parse_wpa(struct ieee80211com *ic, uint8_t *frm,
struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
{
uint8_t len = frm[1];
uint32_t w;
int n;
/*
* Check the length once for fixed parts: OUI, type,
* version, mcast cipher, and 2 selector counts.
* Other, variable-length data, must be checked separately.
*/
if ((ic->ic_flags & IEEE80211_F_WPA1) == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "not WPA, flags 0x%x", ic->ic_flags);
return IEEE80211_REASON_IE_INVALID;
}
if (len < 14) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "too short, len %u", len);
return IEEE80211_REASON_IE_INVALID;
}
frm += 6, len -= 4; /* NB: len is payload only */
/* NB: iswapoui already validated the OUI and type */
w = LE_READ_2(frm);
if (w != WPA_VERSION) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "bad version %u", w);
return IEEE80211_REASON_IE_INVALID;
}
frm += 2, len -= 2;
/* multicast/group cipher */
w = wpa_cipher(frm, &rsn->rsn_mcastkeylen);
if (w != rsn->rsn_mcastcipher) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "mcast cipher mismatch; got %u, expected %u",
w, rsn->rsn_mcastcipher);
return IEEE80211_REASON_IE_INVALID;
}
frm += 4, len -= 4;
/* unicast ciphers */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4+2) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "ucast cipher data too short; len %u, n %u",
len, n);
return IEEE80211_REASON_IE_INVALID;
}
w = 0;
for (; n > 0; n--) {
w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen);
frm += 4, len -= 4;
}
w &= rsn->rsn_ucastcipherset;
if (w == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "%s", "ucast cipher set empty");
return IEEE80211_REASON_IE_INVALID;
}
if (w & (1<<IEEE80211_CIPHER_TKIP))
rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
else
rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
/* key management algorithms */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "key mgmt alg data too short; len %u, n %u",
len, n);
return IEEE80211_REASON_IE_INVALID;
}
w = 0;
for (; n > 0; n--) {
w |= wpa_keymgmt(frm);
frm += 4, len -= 4;
}
w &= rsn->rsn_keymgmtset;
if (w == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "%s", "no acceptable key mgmt alg");
return IEEE80211_REASON_IE_INVALID;
}
if (w & WPA_ASE_8021X_UNSPEC)
rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC;
else
rsn->rsn_keymgmt = WPA_ASE_8021X_PSK;
if (len > 2) /* optional capabilities */
rsn->rsn_caps = LE_READ_2(frm);
return 0;
}
/*
* Convert an RSN cipher selector OUI to an internal
* cipher algorithm. Where appropriate we also
* record any key length.
*/
static int
rsn_cipher(uint8_t *sel, uint8_t *keylen)
{
#define RSN_SEL(x) (((x)<<24)|RSN_OUI)
uint32_t w = LE_READ_4(sel);
switch (w) {
case RSN_SEL(RSN_CSE_NULL):
return IEEE80211_CIPHER_NONE;
case RSN_SEL(RSN_CSE_WEP40):
if (keylen)
*keylen = 40 / NBBY;
return IEEE80211_CIPHER_WEP;
case RSN_SEL(RSN_CSE_WEP104):
if (keylen)
*keylen = 104 / NBBY;
return IEEE80211_CIPHER_WEP;
case RSN_SEL(RSN_CSE_TKIP):
return IEEE80211_CIPHER_TKIP;
case RSN_SEL(RSN_CSE_CCMP):
return IEEE80211_CIPHER_AES_CCM;
case RSN_SEL(RSN_CSE_WRAP):
return IEEE80211_CIPHER_AES_OCB;
}
return 32; /* NB: so 1<< is discarded */
#undef WPA_SEL
}
/*
* Convert an RSN key management/authentication algorithm
* to an internal code.
*/
static int
rsn_keymgmt(uint8_t *sel)
{
#define RSN_SEL(x) (((x)<<24)|RSN_OUI)
uint32_t w = LE_READ_4(sel);
switch (w) {
case RSN_SEL(RSN_ASE_8021X_UNSPEC):
return RSN_ASE_8021X_UNSPEC;
case RSN_SEL(RSN_ASE_8021X_PSK):
return RSN_ASE_8021X_PSK;
case RSN_SEL(RSN_ASE_NONE):
return RSN_ASE_NONE;
}
return 0; /* NB: so is discarded */
#undef RSN_SEL
}
/*
* Parse a WPA/RSN information element to collect parameters
* and validate the parameters against what has been
* configured for the system.
*/
static int
ieee80211_parse_rsn(struct ieee80211com *ic, uint8_t *frm,
struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
{
uint8_t len = frm[1];
uint32_t w;
int n;
/*
* Check the length once for fixed parts:
* version, mcast cipher, and 2 selector counts.
* Other, variable-length data, must be checked separately.
*/
if ((ic->ic_flags & IEEE80211_F_WPA2) == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "WPA", "not RSN, flags 0x%x", ic->ic_flags);
return IEEE80211_REASON_IE_INVALID;
}
if (len < 10) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "too short, len %u", len);
return IEEE80211_REASON_IE_INVALID;
}
frm += 2;
w = LE_READ_2(frm);
if (w != RSN_VERSION) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "bad version %u", w);
return IEEE80211_REASON_IE_INVALID;
}
frm += 2, len -= 2;
/* multicast/group cipher */
w = rsn_cipher(frm, &rsn->rsn_mcastkeylen);
if (w != rsn->rsn_mcastcipher) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "mcast cipher mismatch; got %u, expected %u",
w, rsn->rsn_mcastcipher);
return IEEE80211_REASON_IE_INVALID;
}
frm += 4, len -= 4;
/* unicast ciphers */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4+2) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "ucast cipher data too short; len %u, n %u",
len, n);
return IEEE80211_REASON_IE_INVALID;
}
w = 0;
for (; n > 0; n--) {
w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen);
frm += 4, len -= 4;
}
w &= rsn->rsn_ucastcipherset;
if (w == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "%s", "ucast cipher set empty");
return IEEE80211_REASON_IE_INVALID;
}
if (w & (1<<IEEE80211_CIPHER_TKIP))
rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP;
else
rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM;
/* key management algorithms */
n = LE_READ_2(frm);
frm += 2, len -= 2;
if (len < n*4) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "key mgmt alg data too short; len %u, n %u",
len, n);
return IEEE80211_REASON_IE_INVALID;
}
w = 0;
for (; n > 0; n--) {
w |= rsn_keymgmt(frm);
frm += 4, len -= 4;
}
w &= rsn->rsn_keymgmtset;
if (w == 0) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA,
wh, "RSN", "%s", "no acceptable key mgmt alg");
return IEEE80211_REASON_IE_INVALID;
}
if (w & RSN_ASE_8021X_UNSPEC)
rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC;
else
rsn->rsn_keymgmt = RSN_ASE_8021X_PSK;
/* optional RSN capabilities */
if (len > 2)
rsn->rsn_caps = LE_READ_2(frm);
/* XXXPMKID */
return 0;
}
static int
ieee80211_parse_wmeparams(struct ieee80211com *ic, uint8_t *frm,
const struct ieee80211_frame *wh)
{
#define MS(_v, _f) (((_v) & _f) >> _f##_S)
struct ieee80211_wme_state *wme = &ic->ic_wme;
u_int len = frm[1], qosinfo;
int i;
if (len < sizeof(struct ieee80211_wme_param)-2) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME,
wh, "WME", "too short, len %u", len);
return -1;
}
qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)];
qosinfo &= WME_QOSINFO_COUNT;
/* XXX do proper check for wraparound */
if (qosinfo == wme->wme_wmeChanParams.cap_info)
return 0;
frm += __offsetof(struct ieee80211_wme_param, params_acParams);
for (i = 0; i < WME_NUM_AC; i++) {
struct wmeParams *wmep =
&wme->wme_wmeChanParams.cap_wmeParams[i];
/* NB: ACI not used */
wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM);
wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN);
wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN);
wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX);
wmep->wmep_txopLimit = LE_READ_2(frm+2);
frm += 4;
}
wme->wme_wmeChanParams.cap_info = qosinfo;
return 1;
#undef MS
}
static int
ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm,
const struct ieee80211_frame *wh)
{
struct ieee80211com *ic = ni->ni_ic;
const struct ieee80211_ath_ie *ath;
u_int len = frm[1];
int capschanged;
uint16_t defkeyix;
if (len < sizeof(struct ieee80211_ath_ie)-2) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG,
wh, "Atheros", "too short, len %u", len);
return -1;
}
ath = (const struct ieee80211_ath_ie *)frm;
capschanged = (ni->ni_ath_flags != ath->ath_capability);
defkeyix = LE_READ_2(ath->ath_defkeyix);
if (capschanged || defkeyix != ni->ni_ath_defkeyix) {
ni->ni_ath_flags = ath->ath_capability;
ni->ni_ath_defkeyix = defkeyix;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_SUPERG,
"[%s] ath ie change: new caps 0x%x defkeyix 0x%x\n",
ether_sprintf(ni->ni_macaddr),
ni->ni_ath_flags, ni->ni_ath_defkeyix);
}
if (IEEE80211_ATH_CAP(ic, ni, ATHEROS_CAP_TURBO_PRIME)) {
uint16_t curflags, newflags;
/*
* Check for turbo mode switch. Calculate flags
* for the new mode and effect the switch.
*/
newflags = curflags = ic->ic_bsschan->ic_flags;
/* NB: BOOST is not in ic_flags, so get it from the ie */
if (ath->ath_capability & ATHEROS_CAP_BOOST)
newflags |= IEEE80211_CHAN_TURBO;
else
newflags &= ~IEEE80211_CHAN_TURBO;
if (newflags != curflags)
ieee80211_dturbo_switch(ic, newflags);
}
return capschanged;
}
void
ieee80211_saveath(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);
ieee80211_saveie(&ni->ni_ath_ie, ie);
}
void
ieee80211_saveie(uint8_t **iep, const uint8_t *ie)
{
u_int ielen = ie[1]+2;
/*
* Record information element for later use.
*/
if (*iep == NULL || (*iep)[1] != ie[1]) {
if (*iep != NULL)
FREE(*iep, M_80211_NODE);
MALLOC(*iep, void*, ielen, M_80211_NODE, M_NOWAIT);
}
if (*iep != NULL)
memcpy(*iep, ie, ielen);
/* XXX note failure */
}
/* XXX find a better place for definition */
struct l2_update_frame {
struct ether_header eh;
uint8_t dsap;
uint8_t ssap;
uint8_t control;
uint8_t xid[3];
} __packed;
/*
* Deliver a TGf L2UF frame on behalf of a station.
* This primes any bridge when the station is roaming
* between ap's on the same wired network.
*/
static void
ieee80211_deliver_l2uf(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
struct ifnet *ifp = ic->ic_ifp;
struct mbuf *m;
struct l2_update_frame *l2uf;
struct ether_header *eh;
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL) {
IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni,
"%s", "no mbuf for l2uf frame");
ic->ic_stats.is_rx_nobuf++; /* XXX not right */
return;
}
l2uf = mtod(m, struct l2_update_frame *);
eh = &l2uf->eh;
/* dst: Broadcast address */
IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr);
/* src: associated STA */
IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr);
eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh));
l2uf->dsap = 0;
l2uf->ssap = 0;
l2uf->control = 0xf5;
l2uf->xid[0] = 0x81;
l2uf->xid[1] = 0x80;
l2uf->xid[2] = 0x00;
m->m_pkthdr.len = m->m_len = sizeof(*l2uf);
ieee80211_deliver_data(ic, ni, m);
}
static __inline int
contbgscan(struct ieee80211com *ic)
{
return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) &&
time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle));
}
static __inline int
startbgscan(struct ieee80211com *ic)
{
return ((ic->ic_flags & IEEE80211_F_BGSCAN) &&
!IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) &&
time_after(ticks, ic->ic_lastscan + ic->ic_bgscanintvl) &&
time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle));
}
static void
ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
int reassoc, int resp, const char *tag, int rate)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] deny %s request, %s rate set mismatch, rate 0x%x\n",
ether_sprintf(wh->i_addr2),
reassoc ? "reassoc" : "assoc", tag, rate);
IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_BASIC_RATE);
ieee80211_node_leave(ic, ni);
ic->ic_stats.is_rx_assoc_norate++;
}
static void
capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
int reassoc, int resp, const char *tag, int capinfo)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] deny %s request, %s mismatch 0x%x\n",
ether_sprintf(wh->i_addr2),
reassoc ? "reassoc" : "assoc", tag, capinfo);
IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_CAPINFO);
ieee80211_node_leave(ic, ni);
ic->ic_stats.is_rx_assoc_capmismatch++;
}
void
ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0,
struct ieee80211_node *ni,
int subtype, int rssi, int noise, uint32_t rstamp)
{
#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
struct ieee80211_frame *wh;
uint8_t *frm, *efrm;
uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap;
int reassoc, resp, allocbs;
uint8_t rate;
wh = mtod(m0, struct ieee80211_frame *);
frm = (uint8_t *)&wh[1];
efrm = mtod(m0, uint8_t *) + m0->m_len;
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
case IEEE80211_FC0_SUBTYPE_BEACON: {
struct ieee80211_scanparams scan;
/*
* We process beacon/probe response frames:
* o when scanning, or
* o station mode when associated (to collect state
* updates such as 802.11g slot time), or
* o adhoc mode (to discover neighbors)
* Frames otherwise received are discarded.
*/
if (!((ic->ic_flags & IEEE80211_F_SCAN) ||
(ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd) ||
ic->ic_opmode == IEEE80211_M_IBSS)) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
/*
* 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);
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;
while (efrm - frm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
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(m0, uint8_t *);
break;
case IEEE80211_ELEMID_IBSSPARMS:
break;
case IEEE80211_ELEMID_XRATES:
scan.xrates = frm;
break;
case IEEE80211_ELEMID_ERP:
if (frm[1] != 1) {
IEEE80211_DISCARD_IE(ic,
IEEE80211_MSG_ELEMID, wh, "ERP",
"bad len %u", frm[1]);
ic->ic_stats.is_rx_elem_toobig++;
break;
}
scan.erp = frm[2];
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 (ic->ic_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(ic, IEEE80211_MSG_ELEMID,
wh, "unhandled",
"id %u, len %u", *frm, frm[1]);
ic->ic_stats.is_rx_elem_unknown++;
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE);
if (scan.xrates != NULL)
IEEE80211_VERIFY_ELEMENT(scan.xrates,
IEEE80211_RATE_MAXSIZE - scan.rates[1]);
IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN);
#if IEEE80211_CHAN_MAX < 255
if (scan.chan > IEEE80211_CHAN_MAX) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"invalid channel %u", scan.chan);
ic->ic_stats.is_rx_badchan++;
return;
}
#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(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"for off-channel %u", scan.chan);
ic->ic_stats.is_rx_chanmismatch++;
return;
}
if (!(IEEE80211_BINTVAL_MIN <= scan.bintval &&
scan.bintval <= IEEE80211_BINTVAL_MAX)) {
IEEE80211_DISCARD(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"bogus beacon interval", scan.bintval);
ic->ic_stats.is_rx_badbintval++;
return;
}
/*
* 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);
}
/*
* Count frame now that we know it's to be processed.
*/
if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
ic->ic_stats.is_rx_beacon++; /* XXX remove */
IEEE80211_NODE_STAT(ni, rx_beacons);
} else
IEEE80211_NODE_STAT(ni, rx_proberesp);
/*
* When operating in station mode, check for state updates.
* Be careful to ignore beacons received while doing a
* background scan. We consider only 11g/WMM stuff right now.
*/
if (ic->ic_opmode == IEEE80211_M_STA &&
ni->ni_associd != 0 &&
((ic->ic_flags & IEEE80211_F_SCAN) == 0 ||
IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) {
/* record tsf of last beacon */
memcpy(ni->ni_tstamp.data, scan.tstamp,
sizeof(ni->ni_tstamp));
/* count beacon frame for s/w bmiss handling */
ic->ic_swbmiss_count++;
ic->ic_bmiss_count = 0;
if (ni->ni_erp != scan.erp) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] erp change: was 0x%x, now 0x%x\n",
ether_sprintf(wh->i_addr2),
ni->ni_erp, scan.erp);
if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
(ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
ic->ic_flags |= IEEE80211_F_USEPROT;
else
ic->ic_flags &= ~IEEE80211_F_USEPROT;
ni->ni_erp = scan.erp;
/* XXX statistic */
}
if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] capabilities change: before 0x%x,"
" now 0x%x\n",
ether_sprintf(wh->i_addr2),
ni->ni_capinfo, scan.capinfo);
/*
* NB: we assume short preamble doesn't
* change dynamically
*/
ieee80211_set_shortslottime(ic,
IEEE80211_IS_CHAN_A(ic->ic_bsschan) ||
(scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME)
| (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME);
/* XXX statistic */
}
if (scan.wme != NULL &&
(ni->ni_flags & IEEE80211_NODE_QOS) &&
ieee80211_parse_wmeparams(ic, scan.wme, wh) > 0)
ieee80211_wme_updateparams(ic);
if (scan.ath != NULL)
ieee80211_parse_athparams(ni, scan.ath, wh);
if (scan.htcap != NULL)
ieee80211_parse_htcap(ni, scan.htcap);
if (scan.htinfo != NULL)
ieee80211_parse_htinfo(ni, scan.htinfo);
if (scan.tim != NULL) {
struct ieee80211_tim_ie *tim =
(struct ieee80211_tim_ie *) scan.tim;
#if 0
int aid = IEEE80211_AID(ni->ni_associd);
int ix = aid / NBBY;
int min = tim->tim_bitctl &~ 1;
int max = tim->tim_len + min - 4;
if ((tim->tim_bitctl&1) ||
(min <= ix && ix <= max &&
isset(tim->tim_bitmap - min, aid))) {
/*
* XXX Do not let bg scan kick off
* we are expecting data.
*/
ic->ic_lastdata = ticks;
ieee80211_sta_pwrsave(ic, 0);
}
#endif
ni->ni_dtim_count = tim->tim_count;
ni->ni_dtim_period = tim->tim_period;
}
/*
* If scanning, pass the info to the scan module.
* Otherwise, check if it's the right time to do
* a background scan. Background scanning must
* be enabled and we must not be operating in the
* turbo phase of dynamic turbo mode. Then,
* it's been a while since the last background
* scan and if no data frames have come through
* recently, kick off a scan. Note that this
* is the mechanism by which a background scan
* is started _and_ continued each time we
* return on-channel to receive a beacon from
* our ap.
*/
if (ic->ic_flags & IEEE80211_F_SCAN) {
ieee80211_add_scan(ic, &scan, wh,
subtype, rssi, noise, rstamp);
} else if (contbgscan(ic)) {
ieee80211_bg_scan(ic);
} else if (startbgscan(ic)) {
#if 0
/* wakeup if we are sleeing */
ieee80211_set_pwrsave(ic, 0);
#endif
ieee80211_bg_scan(ic);
}
return;
}
/*
* If scanning, just pass information to the scan module.
*/
if (ic->ic_flags & IEEE80211_F_SCAN) {
if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
/*
* Actively scanning a channel marked passive;
* send a probe request now that we know there
* is 802.11 traffic present.
*
* XXX check if the beacon we recv'd gives
* us what we need and suppress the probe req
*/
ieee80211_probe_curchan(ic, 1);
ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
}
ieee80211_add_scan(ic, &scan, wh,
subtype, rssi, noise, rstamp);
return;
}
if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
/*
* Create a new entry in the neighbor table.
*/
ni = ieee80211_add_neighbor(ic, wh, &scan);
} else if (ni->ni_capinfo == 0) {
/*
* Update faked node created on transmit.
* Note this also updates the tsf.
*/
ieee80211_init_neighbor(ni, wh, &scan);
} else {
/*
* Record tsf for potential resync.
*/
memcpy(ni->ni_tstamp.data, scan.tstamp,
sizeof(ni->ni_tstamp));
}
if (ni != NULL) {
ni->ni_rssi = rssi;
ni->ni_noise = noise;
ni->ni_rstamp = rstamp;
}
}
break;
}
case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
if (ic->ic_opmode == IEEE80211_M_STA ||
ic->ic_state != IEEE80211_S_RUN) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
/* frame must be directed */
ic->ic_stats.is_rx_mgtdiscard++; /* XXX stat */
return;
}
/*
* prreq frame format
* [tlv] ssid
* [tlv] supported rates
* [tlv] extended supported rates
* [tlv] Atheros capabilities
*/
ssid = rates = xrates = ath = NULL;
while (efrm - frm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
switch (*frm) {
case IEEE80211_ELEMID_SSID:
ssid = frm;
break;
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (isatherosoui(frm))
ath = frm;
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
if (xrates != NULL)
IEEE80211_VERIFY_ELEMENT(xrates,
IEEE80211_RATE_MAXSIZE - rates[1]);
IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
IEEE80211_VERIFY_SSID(ic->ic_bss, ssid);
if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "no ssid with ssid suppression enabled");
ic->ic_stats.is_rx_ssidmismatch++; /*XXX*/
return;
}
allocbs = 0;
if (ni == ic->ic_bss) {
if (ic->ic_opmode != IEEE80211_M_IBSS) {
ni = ieee80211_tmp_node(ic, wh->i_addr2);
allocbs = 1;
} else if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
/*
* XXX Cannot tell if the sender is operating
* in ibss mode. But we need a new node to
* send the response so blindly add them to the
* neighbor table.
*/
ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta,
wh->i_addr2);
}
if (ni == NULL)
return;
}
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] recv probe req\n", ether_sprintf(wh->i_addr2));
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
rate = ieee80211_setup_rates(ni, rates, xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE
| IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (rate & IEEE80211_RATE_BASIC) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_XRATE,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "recv'd rate set invalid");
} else {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0);
}
if (allocbs) {
/*
* Temporary node created just to send a
* response, reclaim immediately.
*/
ieee80211_free_node(ni);
} else if (ath != NULL)
ieee80211_saveath(ni, ath);
break;
case IEEE80211_FC0_SUBTYPE_AUTH: {
uint16_t algo, seq, status;
/*
* auth frame format
* [2] algorithm
* [2] sequence
* [2] status
* [tlv*] challenge
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
algo = le16toh(*(uint16_t *)frm);
seq = le16toh(*(uint16_t *)(frm + 2));
status = le16toh(*(uint16_t *)(frm + 4));
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
"[%s] recv auth frame with algorithm %d seq %d\n",
ether_sprintf(wh->i_addr2), algo, seq);
/*
* Consult the ACL policy module if setup.
*/
if (ic->ic_acl != NULL &&
!ic->ic_acl->iac_check(ic, wh->i_addr2)) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_ACL,
wh, "auth", "%s", "disallowed by ACL");
ic->ic_stats.is_rx_acl++;
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16));
}
return;
}
if (ic->ic_flags & IEEE80211_F_COUNTERM) {
IEEE80211_DISCARD(ic,
IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO,
wh, "auth", "%s", "TKIP countermeasures enabled");
ic->ic_stats.is_rx_auth_countermeasures++;
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH,
IEEE80211_REASON_MIC_FAILURE);
}
return;
}
if (algo == IEEE80211_AUTH_ALG_SHARED)
ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi,
noise, rstamp, seq, status);
else if (algo == IEEE80211_AUTH_ALG_OPEN)
ieee80211_auth_open(ic, wh, ni, rssi, noise, rstamp,
seq, status);
else {
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
wh, "auth", "unsupported alg %d", algo);
ic->ic_stats.is_rx_auth_unsupported++;
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
/* XXX not right */
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_AUTH,
(seq+1) | (IEEE80211_STATUS_ALG<<16));
}
return;
}
break;
}
case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
uint16_t capinfo, lintval;
struct ieee80211_rsnparms rsnparms;
uint8_t reason;
int badwparsn;
if (ic->ic_opmode != IEEE80211_M_HOSTAP ||
ic->ic_state != IEEE80211_S_RUN) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
reassoc = 1;
resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
} else {
reassoc = 0;
resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
}
/*
* asreq frame format
* [2] capability information
* [2] listen interval
* [6*] current AP address (reassoc only)
* [tlv] ssid
* [tlv] supported rates
* [tlv] extended supported rates
* [tlv] WPA or RSN
* [tlv] HT capabilities
* [tlv] Atheros capabilities
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return);
if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"%s", "wrong bssid");
ic->ic_stats.is_rx_assoc_bss++;
return;
}
capinfo = le16toh(*(uint16_t *)frm); frm += 2;
lintval = le16toh(*(uint16_t *)frm); frm += 2;
if (reassoc)
frm += 6; /* ignore current AP info */
ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL;
while (efrm - frm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
switch (*frm) {
case IEEE80211_ELEMID_SSID:
ssid = frm;
break;
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
/* XXX verify only one of RSN and WPA ie's? */
case IEEE80211_ELEMID_RSN:
rsn = frm;
break;
case IEEE80211_ELEMID_HTCAP:
htcap = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(frm))
wpa = frm;
else if (iswmeinfo(frm))
wme = frm;
else if (isatherosoui(frm))
ath = frm;
else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) {
if (ishtcapoui(frm) && htcap == NULL)
htcap = frm;
}
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
if (xrates != NULL)
IEEE80211_VERIFY_ELEMENT(xrates,
IEEE80211_RATE_MAXSIZE - rates[1]);
IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
IEEE80211_VERIFY_SSID(ic->ic_bss, ssid);
if (htcap != NULL) {
IEEE80211_VERIFY_LENGTH(htcap[1],
htcap[0] == IEEE80211_ELEMID_VENDOR ?
4 + sizeof(struct ieee80211_ie_htcap)-2 :
sizeof(struct ieee80211_ie_htcap)-2,
return); /* XXX just NULL out? */
}
if (ni == ic->ic_bss) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] deny %s request, sta not authenticated\n",
ether_sprintf(wh->i_addr2),
reassoc ? "reassoc" : "assoc");
ieee80211_send_error(ic, ni, wh->i_addr2,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_ASSOC_NOT_AUTHED);
ic->ic_stats.is_rx_assoc_notauth++;
return;
}
/* assert right association security credentials */
badwparsn = 0;
switch (ic->ic_flags & IEEE80211_F_WPA) {
case IEEE80211_F_WPA1:
if (wpa == NULL)
badwparsn = 1;
break;
case IEEE80211_F_WPA2:
if (rsn == NULL)
badwparsn = 1;
break;
case IEEE80211_F_WPA1|IEEE80211_F_WPA2:
if (wpa == NULL && rsn == NULL)
badwparsn = 1;
break;
}
if (badwparsn) {
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
"[%s] no WPA/RSN IE in association request\n",
ether_sprintf(wh->i_addr2));
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_RSN_REQUIRED);
ieee80211_node_leave(ic, ni);
ic->ic_stats.is_rx_assoc_badwpaie++;
return;
}
if (wpa != NULL || rsn != NULL) {
/*
* Parse WPA/RSN information element. Note that
* we initialize the param block from the node
* state so that information in the IE overrides
* our defaults. The resulting parameters are
* installed below after the association is assured.
*/
rsnparms = ni->ni_rsn;
if (wpa != NULL)
reason = ieee80211_parse_wpa(ic, wpa, &rsnparms, wh);
else
reason = ieee80211_parse_rsn(ic, rsn, &rsnparms, wh);
if (reason != 0) {
IEEE80211_SEND_MGMT(ic, ni,
IEEE80211_FC0_SUBTYPE_DEAUTH, reason);
ieee80211_node_leave(ic, ni);
/* XXX distinguish WPA/RSN? */
ic->ic_stats.is_rx_assoc_badwpaie++;
return;
}
IEEE80211_DPRINTF(ic,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA,
"[%s] %s ie: mc %u/%u uc %u/%u key %u caps 0x%x\n",
ether_sprintf(wh->i_addr2),
wpa != NULL ? "WPA" : "RSN",
rsnparms.rsn_mcastcipher, rsnparms.rsn_mcastkeylen,
rsnparms.rsn_ucastcipher, rsnparms.rsn_ucastkeylen,
rsnparms.rsn_keymgmt, rsnparms.rsn_caps);
}
/* discard challenge after association */
if (ni->ni_challenge != NULL) {
FREE(ni->ni_challenge, M_80211_NODE);
ni->ni_challenge = NULL;
}
/* NB: 802.11 spec says to ignore station's privacy bit */
if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
capinfomismatch(ni, wh, reassoc, resp,
"capability", capinfo);
return;
}
/*
* Disallow re-associate w/ invalid slot time setting.
*/
if (ni->ni_associd != 0 &&
IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) &&
((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
capinfomismatch(ni, wh, reassoc, resp,
"slot time", capinfo);
return;
}
rate = ieee80211_setup_rates(ni, rates, xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (rate & IEEE80211_RATE_BASIC) {
ratesetmismatch(ni, wh, reassoc, resp, "basic", rate);
return;
}
/*
* If constrained to 11g-only stations reject an
* 11b-only station. We cheat a bit here by looking
* at the max negotiated xmit rate and assuming anyone
* with a best rate <24Mb/s is an 11b station.
*/
if ((ic->ic_flags & IEEE80211_F_PUREG) && rate < 48) {
ratesetmismatch(ni, wh, reassoc, resp, "11g", rate);
return;
}
/* XXX enforce PUREN */
/* 802.11n-specific rateset handling */
if (IEEE80211_IS_CHAN_HT(ic->ic_curchan) && htcap != NULL) {
rate = ieee80211_setup_htrates(ni, htcap,
IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO |
IEEE80211_F_DOBRS);
if (rate & IEEE80211_RATE_BASIC) {
/* XXX 11n-specific stat */
ratesetmismatch(ni, wh, reassoc, resp,
"HT", rate);
return;
}
ieee80211_ht_node_init(ni, htcap);
} else if (ni->ni_flags & IEEE80211_NODE_HT)
ieee80211_ht_node_cleanup(ni);
ni->ni_rssi = rssi;
ni->ni_noise = noise;
ni->ni_rstamp = rstamp;
ni->ni_intval = lintval;
ni->ni_capinfo = capinfo;
ni->ni_chan = ic->ic_bsschan;
ni->ni_fhdwell = ic->ic_bss->ni_fhdwell;
ni->ni_fhindex = ic->ic_bss->ni_fhindex;
if (wpa != NULL) {
/*
* Record WPA parameters for station, mark
* node as using WPA and record information element
* for applications that require it.
*/
ni->ni_rsn = rsnparms;
ieee80211_saveie(&ni->ni_wpa_ie, wpa);
} else if (ni->ni_wpa_ie != NULL) {
/*
* Flush any state from a previous association.
*/
FREE(ni->ni_wpa_ie, M_80211_NODE);
ni->ni_wpa_ie = NULL;
}
if (rsn != NULL) {
/*
* Record RSN parameters for station, mark
* node as using WPA and record information element
* for applications that require it.
*/
ni->ni_rsn = rsnparms;
ieee80211_saveie(&ni->ni_rsn_ie, rsn);
} else if (ni->ni_rsn_ie != NULL) {
/*
* Flush any state from a previous association.
*/
FREE(ni->ni_rsn_ie, M_80211_NODE);
ni->ni_rsn_ie = NULL;
}
if (wme != NULL) {
/*
* Record WME parameters for station, mark node
* as capable of QoS and record information
* element for applications that require it.
*/
ieee80211_saveie(&ni->ni_wme_ie, wme);
ni->ni_flags |= IEEE80211_NODE_QOS;
} else if (ni->ni_wme_ie != NULL) {
/*
* Flush any state from a previous association.
*/
FREE(ni->ni_wme_ie, M_80211_NODE);
ni->ni_wme_ie = NULL;
ni->ni_flags &= ~IEEE80211_NODE_QOS;
}
if (ath != NULL) {
/*
* Record ATH parameters for station, mark
* node with appropriate capabilities, and
* record the information element for
* applications that require it.
*/
ieee80211_saveath(ni, ath);
} else if (ni->ni_ath_ie != NULL) {
/*
* Flush any state from a previous association.
*/
FREE(ni->ni_ath_ie, M_80211_NODE);
ni->ni_ath_ie = NULL;
ni->ni_ath_flags = 0;
}
ieee80211_node_join(ic, ni, resp);
ieee80211_deliver_l2uf(ni);
break;
}
case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
uint16_t capinfo, associd;
uint16_t status;
if (ic->ic_opmode != IEEE80211_M_STA ||
ic->ic_state != IEEE80211_S_ASSOC) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
/*
* asresp frame format
* [2] capability information
* [2] status
* [2] association ID
* [tlv] supported rates
* [tlv] extended supported rates
* [tlv] WME
* [tlv] HT capabilities
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return);
ni = ic->ic_bss;
capinfo = le16toh(*(uint16_t *)frm);
frm += 2;
status = le16toh(*(uint16_t *)frm);
frm += 2;
if (status != 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] %sassoc failed (reason %d)\n",
ether_sprintf(wh->i_addr2),
ISREASSOC(subtype) ? "re" : "", status);
if (ni != ic->ic_bss) /* XXX never true? */
ni->ni_fails++;
ic->ic_stats.is_rx_auth_fail++; /* XXX */
return;
}
associd = le16toh(*(uint16_t *)frm);
frm += 2;
rates = xrates = wme = htcap = NULL;
while (efrm - frm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
switch (*frm) {
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
case IEEE80211_ELEMID_HTCAP:
htcap = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswmeoui(frm))
wme = frm;
/* XXX Atheros OUI support */
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
if (xrates != NULL)
IEEE80211_VERIFY_ELEMENT(xrates,
IEEE80211_RATE_MAXSIZE - rates[1]);
rate = ieee80211_setup_rates(ni, rates, xrates,
IEEE80211_F_JOIN |
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
if (rate & IEEE80211_RATE_BASIC) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] %sassoc failed (rate set mismatch)\n",
ether_sprintf(wh->i_addr2),
ISREASSOC(subtype) ? "re" : "");
if (ni != ic->ic_bss) /* XXX never true? */
ni->ni_fails++;
ic->ic_stats.is_rx_assoc_norate++;
ieee80211_new_state(ic, IEEE80211_S_SCAN,
IEEE80211_SCAN_FAIL_STATUS);
return;
}
ni->ni_capinfo = capinfo;
ni->ni_associd = associd;
if (wme != NULL &&
ieee80211_parse_wmeparams(ic, wme, wh) >= 0) {
ni->ni_flags |= IEEE80211_NODE_QOS;
ieee80211_wme_updateparams(ic);
} else
ni->ni_flags &= ~IEEE80211_NODE_QOS;
/*
* Configure state now that we are associated.
*
* XXX may need different/additional driver callbacks?
*/
if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) {
ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
ic->ic_flags &= ~IEEE80211_F_USEBARKER;
} else {
ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
ic->ic_flags |= IEEE80211_F_USEBARKER;
}
ieee80211_set_shortslottime(ic,
IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
/*
* Honor ERP protection.
*
* NB: ni_erp should zero for non-11g operation.
*/
if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
(ni->ni_erp & IEEE80211_ERP_USE_PROTECTION))
ic->ic_flags |= IEEE80211_F_USEPROT;
else
ic->ic_flags &= ~IEEE80211_F_USEPROT;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] %sassoc success: %s preamble, %s slot time%s%s%s%s\n",
ether_sprintf(wh->i_addr2),
ISREASSOC(subtype) ? "re" : "",
ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long",
ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long",
ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "",
ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "",
IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_FF) ?
", fast-frames" : "",
IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_TURBOP) ?
", turbo" : ""
);
ieee80211_new_state(ic, IEEE80211_S_RUN, subtype);
break;
}
case IEEE80211_FC0_SUBTYPE_DEAUTH: {
uint16_t reason;
if (ic->ic_state == IEEE80211_S_SCAN) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
/*
* deauth frame format
* [2] reason
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
reason = le16toh(*(uint16_t *)frm);
ic->ic_stats.is_rx_deauth++;
IEEE80211_NODE_STAT(ni, rx_deauth);
if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) {
/* NB: can happen when in promiscuous mode */
ic->ic_stats.is_rx_mgtdiscard++;
break;
}
IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
"[%s] recv deauthenticate (reason %d)\n",
ether_sprintf(ni->ni_macaddr), reason);
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
ieee80211_new_state(ic, IEEE80211_S_AUTH,
(reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH);
break;
case IEEE80211_M_HOSTAP:
if (ni != ic->ic_bss)
ieee80211_node_leave(ic, ni);
break;
default:
ic->ic_stats.is_rx_mgtdiscard++;
break;
}
break;
}
case IEEE80211_FC0_SUBTYPE_DISASSOC: {
uint16_t reason;
if (ic->ic_state != IEEE80211_S_RUN &&
ic->ic_state != IEEE80211_S_ASSOC &&
ic->ic_state != IEEE80211_S_AUTH) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
/*
* disassoc frame format
* [2] reason
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return);
reason = le16toh(*(uint16_t *)frm);
ic->ic_stats.is_rx_disassoc++;
IEEE80211_NODE_STAT(ni, rx_disassoc);
if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) {
/* NB: can happen when in promiscuous mode */
ic->ic_stats.is_rx_mgtdiscard++;
break;
}
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
"[%s] recv disassociate (reason %d)\n",
ether_sprintf(ni->ni_macaddr), reason);
switch (ic->ic_opmode) {
case IEEE80211_M_STA:
ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0);
break;
case IEEE80211_M_HOSTAP:
if (ni != ic->ic_bss)
ieee80211_node_leave(ic, ni);
break;
default:
ic->ic_stats.is_rx_mgtdiscard++;
break;
}
break;
}
case IEEE80211_FC0_SUBTYPE_ACTION: {
const struct ieee80211_action *ia;
if (ic->ic_state != IEEE80211_S_RUN &&
ic->ic_state != IEEE80211_S_ASSOC &&
ic->ic_state != IEEE80211_S_AUTH) {
ic->ic_stats.is_rx_mgtdiscard++;
return;
}
/*
* action frame format:
* [1] category
* [1] action
* [tlv] parameters
*/
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action), return);
ia = (const struct ieee80211_action *) frm;
ic->ic_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);
break;
case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action_ba_addbaresponse),
return);
break;
case IEEE80211_ACTION_BA_DELBA:
IEEE80211_VERIFY_LENGTH(efrm - frm,
sizeof(struct ieee80211_action_ba_delba),
return);
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);
break;
}
break;
}
ic->ic_recv_action(ni, frm, efrm);
break;
}
default:
IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY,
wh, "mgt", "subtype 0x%x not handled", subtype);
ic->ic_stats.is_rx_badsubtype++;
break;
}
#undef ISREASSOC
#undef ISPROBE
}
#undef IEEE80211_VERIFY_LENGTH
#undef IEEE80211_VERIFY_ELEMENT
/*
* Process a received ps-poll frame.
*/
static void
ieee80211_recv_pspoll(struct ieee80211com *ic,
struct ieee80211_node *ni, struct mbuf *m0)
{
struct ieee80211_frame_min *wh;
struct mbuf *m;
uint16_t aid;
int qlen;
wh = mtod(m0, struct ieee80211_frame_min *);
if (ni->ni_associd == 0) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
(struct ieee80211_frame *) wh, "ps-poll",
"%s", "unassociated station");
ic->ic_stats.is_ps_unassoc++;
IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_NOT_ASSOCED);
return;
}
aid = le16toh(*(uint16_t *)wh->i_dur);
if (aid != ni->ni_associd) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG,
(struct ieee80211_frame *) wh, "ps-poll",
"aid mismatch: sta aid 0x%x poll aid 0x%x",
ni->ni_associd, aid);
ic->ic_stats.is_ps_badaid++;
IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH,
IEEE80211_REASON_NOT_ASSOCED);
return;
}
/* Okay, take the first queued packet and put it out... */
IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen);
if (m == NULL) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] recv ps-poll, but queue empty\n",
ether_sprintf(wh->i_addr2));
ieee80211_send_nulldata(ieee80211_ref_node(ni));
ic->ic_stats.is_ps_qempty++; /* XXX node stat */
if (ic->ic_set_tim != NULL)
ic->ic_set_tim(ni, 0); /* just in case */
return;
}
/*
* If there are more packets, set the more packets bit
* in the packet dispatched to the station; otherwise
* turn off the TIM bit.
*/
if (qlen != 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] recv ps-poll, send packet, %u still queued\n",
ether_sprintf(ni->ni_macaddr), qlen);
m->m_flags |= M_MORE_DATA;
} else {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] recv ps-poll, send packet, queue empty\n",
ether_sprintf(ni->ni_macaddr));
if (ic->ic_set_tim != NULL)
ic->ic_set_tim(ni, 0);
}
m->m_flags |= M_PWR_SAV; /* bypass PS handling */
IF_ENQUEUE(&ic->ic_ifp->if_snd, m);
}
#ifdef IEEE80211_DEBUG
/*
* Debugging support.
*/
/*
* Return the bssid of a frame.
*/
static const uint8_t *
ieee80211_getbssid(struct ieee80211com *ic, const struct ieee80211_frame *wh)
{
if (ic->ic_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;
}
void
ieee80211_note(struct ieee80211com *ic, 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(ic->ic_ifp, "%s", buf); /* NB: no \n */
}
void
ieee80211_note_frame(struct ieee80211com *ic,
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(ic->ic_ifp, "[%s] %s\n",
ether_sprintf(ieee80211_getbssid(ic, wh)), buf);
}
void
ieee80211_note_mac(struct ieee80211com *ic,
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(ic->ic_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
}
void
ieee80211_discard_frame(struct ieee80211com *ic,
const struct ieee80211_frame *wh,
const char *type, const char *fmt, ...)
{
va_list ap;
printf("[%s:%s] discard ", ic->ic_ifp->if_xname,
ether_sprintf(ieee80211_getbssid(ic, wh)));
if (type != NULL)
printf("%s frame, ", type);
else
printf("frame, ");
va_start(ap, fmt);
vprintf(fmt, ap);
va_end(ap);
printf("\n");
}
void
ieee80211_discard_ie(struct ieee80211com *ic,
const struct ieee80211_frame *wh,
const char *type, const char *fmt, ...)
{
va_list ap;
printf("[%s:%s] discard ", ic->ic_ifp->if_xname,
ether_sprintf(ieee80211_getbssid(ic, 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 ieee80211com *ic,
const uint8_t mac[IEEE80211_ADDR_LEN],
const char *type, const char *fmt, ...)
{
va_list ap;
printf("[%s:%s] discard ", ic->ic_ifp->if_xname, 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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