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12c5f8a8e3
freebsd/sys/net80211/ieee80211_input.c
Sepherosa Ziehau 12c5f8a8e3 - Correctly handle ALTQ in ieee80211_deliver_data() 
- Add comment from sam that ALTQ probably does not work well with WME

PR: kern/119548
Approved by: sam (mentor)
2008-02-03 12:00:03 +00:00

3434 lines
97 KiB
C
Raw Blame History

/*-
* 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 {
/* XXX M_WEP and IEEE80211_F_PRIVACY */
key = NULL;
}
/*
* Save QoS bits for use below--before we strip the header.
*/
if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
((struct ieee80211_qosframe *)wh)->i_qos[0];
} else
qos = 0;
/*
* Next up, any fragmentation.
*/
if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
m = ieee80211_defrag(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 && (m->m_flags & M_WEP) == 0) &&
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);
/* clear driver/net80211 flags before passing up */
m->m_flags &= ~M_80211_RX;
/* 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) {
int error;
/* XXX does not work well with WME */
IFQ_HANDOFF(ifp, m1, error);
}
}
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++;
}
static void
htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh,
int reassoc, int resp)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_NOTE_MAC(ic, IEEE80211_MSG_ANY, wh->i_addr2,
"deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc");
/* XXX no better code */
IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_OTHER);
ieee80211_node_leave(ic, ni);
}
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, *htinfo;
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_curchan);
scan.curchan = ic->ic_curchan;
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.bchan = 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.bchan = 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 (IEEE80211_CHAN2IEEE(scan.curchan) != 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",
IEEE80211_CHAN2IEEE(scan.curchan));
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 (ni->ni_chan != ic->ic_bsschan) {
/*
* Channel has been adjusted based on
* negotiated HT parameters; force the
* channel state to follow.
*/
ieee80211_setbsschan(ic, ni->ni_chan);
}
}
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_IE_INVALID);
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);
/*
* Allow AMPDU operation only with unencrypted traffic
* or AES-CCM; the 11n spec only specifies these ciphers
* so permitting any others is undefined and can lead
* to interoperability problems.
*
* NB: We check for AES by looking at the GTK cipher
* since the WPA/11i specs say the PTK cipher has
* to be "as good or better".
*/
if ((ni->ni_flags & IEEE80211_NODE_HT) &&
(((ic->ic_flags & IEEE80211_F_WPA) &&
rsnparms.rsn_mcastcipher != IEEE80211_CIPHER_AES_CCM) ||
(ic->ic_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) {
IEEE80211_NOTE(ic,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
"disallow HT use because WEP or TKIP requested, "
"capinfo 0x%x mcastcipher %d", capinfo,
rsnparms.rsn_mcastcipher);
ieee80211_ht_node_cleanup(ni);
ic->ic_stats.is_ht_assoc_downgrade++;
}
/*
* If constrained to 11n-only stations reject legacy stations.
*/
if ((ic->ic_flags_ext & IEEE80211_FEXT_PUREN) &&
(ni->ni_flags & IEEE80211_NODE_HT) == 0) {
htcapmismatch(ni, wh, reassoc, resp);
ic->ic_stats.is_ht_assoc_nohtcap++;
return;
}
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
* [tlv] HT info
*/
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 = htinfo = 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_HTINFO:
htinfo = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswmeoui(frm))
wme = 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 (htcap == NULL)
htcap = frm;
} else if (ishtinfooui(frm)) {
if (htinfo == NULL)
htcap = 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;
/*
* Setup HT state according to the negotiation.
*/
if ((ic->ic_htcaps & IEEE80211_HTC_HT) &&
htcap != NULL && htinfo != NULL) {
ieee80211_ht_node_init(ni, htcap);
ieee80211_parse_htinfo(ni, htinfo);
ieee80211_setup_htrates(ni,
htcap, IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
ieee80211_setup_basic_htrates(ni, htinfo);
if (ni->ni_chan != ic->ic_bsschan) {
/*
* Channel has been adjusted based on
* negotiated HT parameters; force the
* channel state to follow.
*/
ieee80211_setbsschan(ic, ni->ni_chan);
}
}
/*
* 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" : "",
ni->ni_flags & IEEE80211_NODE_HT ?
(ni->ni_chw == 20 ? ", HT20" : ", HT40") : "",
ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "",
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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