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Code Issues Releases Activity
2dca4ca723
freebsd/sys/net80211/ieee80211_input.c
Christian S.J. Peron 16d878cc99 Fix the following bpf(4) race condition which can result in a panic: 
(1) bpf peer attaches to interface netif0
	(2) Packet is received by netif0
	(3) ifp->if_bpf pointer is checked and handed off to bpf
	(4) bpf peer detaches from netif0 resulting in ifp->if_bpf being
	    initialized to NULL.
	(5) ifp->if_bpf is dereferenced by bpf machinery
	(6) Kaboom

This race condition likely explains the various different kernel panics
reported around sending SIGINT to tcpdump or dhclient processes. But really
this race can result in kernel panics anywhere you have frequent bpf attach
and detach operations with high packet per second load.

Summary of changes:

- Remove the bpf interface's "driverp" member
- When we attach bpf interfaces, we now set the ifp->if_bpf member to the
  bpf interface structure. Once this is done, ifp->if_bpf should never be
  NULL. [1]
- Introduce bpf_peers_present function, an inline operation which will do
  a lockless read bpf peer list associated with the interface. It should
  be noted that the bpf code will pickup the bpf_interface lock before adding
  or removing bpf peers. This should serialize the access to the bpf descriptor
  list, removing the race.
- Expose the bpf_if structure in bpf.h so that the bpf_peers_present function
  can use it. This also removes the struct bpf_if; hack that was there.
- Adjust all consumers of the raw if_bpf structure to use bpf_peers_present

Now what happens is:

	(1) Packet is received by netif0
	(2) Check to see if bpf descriptor list is empty
	(3) Pickup the bpf interface lock
	(4) Hand packet off to process

From the attach/detach side:

	(1) Pickup the bpf interface lock
	(2) Add/remove from bpf descriptor list

Now that we are storing the bpf interface structure with the ifnet, there is
is no need to walk the bpf interface list to locate the correct bpf interface.
We now simply look up the interface, and initialize the pointer. This has a
nice side effect of changing a bpf interface attach operation from O(N) (where
N is the number of bpf interfaces), to O(1).

[1] From now on, we can no longer check ifp->if_bpf to tell us whether or
    not we have any bpf peers that might be interested in receiving packets.

In collaboration with:	sam@
MFC after:	1 month
2006-06-02 19:59:33 +00:00

2862 lines
80 KiB
C
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/*-
* Copyright (c) 2001 Atsushi Onoe
* Copyright (c) 2002-2005 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* 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;
}
/*
* Emit a debug message about discarding a frame or information
* element. One format is for extracting the mac address from
* the frame header; the other is for when a header is not
* available or otherwise appropriate.
*/
#define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...) do { \
if ((_ic)->ic_debug & (_m)) \
ieee80211_discard_frame(_ic, _wh, _type, _fmt, __VA_ARGS__);\
} while (0)
#define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...) do { \
if ((_ic)->ic_debug & (_m)) \
ieee80211_discard_ie(_ic, _wh, _type, _fmt, __VA_ARGS__);\
} while (0)
#define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...) do { \
if ((_ic)->ic_debug & (_m)) \
ieee80211_discard_mac(_ic, _mac, _type, _fmt, __VA_ARGS__);\
} while (0)
static const u_int8_t *ieee80211_getbssid(struct ieee80211com *,
const struct ieee80211_frame *);
static void ieee80211_discard_frame(struct ieee80211com *,
const struct ieee80211_frame *, const char *type, const char *fmt, ...);
static void ieee80211_discard_ie(struct ieee80211com *,
const struct ieee80211_frame *, const char *type, const char *fmt, ...);
static void ieee80211_discard_mac(struct ieee80211com *,
const u_int8_t mac[IEEE80211_ADDR_LEN], const char *type,
const char *fmt, ...);
#else
#define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...)
#define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...)
#define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...)
#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 u_int8_t *mac, int subtype, int arg);
static void ieee80211_deliver_data(struct ieee80211com *,
struct ieee80211_node *, struct mbuf *);
static void ieee80211_node_pwrsave(struct ieee80211_node *, int enable);
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, u_int32_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;
u_int8_t dir, type, subtype;
u_int8_t *bssid;
u_int16_t rxseq;
KASSERT(ni != NULL, ("null node"));
ni->ni_inact = ni->ni_inact_reload;
/* trim CRC here so WEP can find its own CRC at the end of packet. */
if (m->m_flags & M_HASFCS) {
m_adj(m, -IEEE80211_CRC_LEN);
m->m_flags &= ~M_HASFCS;
}
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_rstamp = rstamp;
if (HAS_SEQ(type)) {
u_int8_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 = 0;
rxseq = le16toh(*(u_int16_t *)wh->i_seq);
if ((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", "%s", "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", "%s", "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", "%s", "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.
*/
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 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;
}
/*
* 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");
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);
/*
* 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)
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;
}
}
ifp->if_ipackets++;
IEEE80211_NODE_STAT(ni, rx_data);
IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
ieee80211_deliver_data(ic, ni, m);
return IEEE80211_FC0_TYPE_DATA;
case IEEE80211_FC0_TYPE_MGT:
IEEE80211_NODE_STAT(ni, rx_mgmt);
if (dir != IEEE80211_FC1_DIR_NODS) {
IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT,
wh, "data", "%s", "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, rstamp);
m_freem(m);
return type;
case IEEE80211_FC0_TYPE_CTL:
IEEE80211_NODE_STAT(ni, rx_ctrl);
ic->ic_stats.is_rx_ctl++;
if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_PS_POLL:
ieee80211_recv_pspoll(ic, 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))
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;
u_int16_t rxseq;
u_int8_t fragno;
u_int8_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(*(u_int16_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) {
u_int16_t last_rxseq;
lwh = mtod(mfrag, struct ieee80211_frame *);
last_rxseq = le16toh(*(u_int16_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 */
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 *);
*(u_int16_t *) lwh->i_seq = *(u_int16_t *) wh->i_seq;
}
if (more_frag) { /* more to come, save */
ni->ni_rxfragstamp = ticks;
ni->ni_rxfrag[0] = mfrag;
mfrag = NULL;
}
return mfrag;
}
static 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;
/* 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 (ETHER_IS_MULTICAST(eh->ether_dhost)) {
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)
IF_HANDOFF(&ifp->if_snd, m1, ifp);
}
if (m != NULL) {
if (ni->ni_vlan != 0) {
/* attach vlan tag */
VLAN_INPUT_TAG(ifp, m, ni->ni_vlan);
if (m == NULL)
goto out; /* XXX goto err? */
}
(*ifp->if_input)(ifp, m);
}
return;
out:
if (m != NULL) {
if (bpf_peers_present(ic->ic_rawbpf))
bpf_mtap(ic->ic_rawbpf, m);
m_freem(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), u_int32_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;
}
/*
* Install received rate set information in the node's state block.
*/
int
ieee80211_setup_rates(struct ieee80211_node *ni,
const u_int8_t *rates, const u_int8_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) {
u_int8_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, flags);
}
static void
ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh,
struct ieee80211_node *ni, int rssi, u_int32_t rstamp, u_int16_t seq,
u_int16_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) {
/* 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:
/* 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, 0);
} else
ieee80211_new_state(ic, IEEE80211_S_ASSOC,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
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 u_int8_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, u_int32_t*, IEEE80211_CHALLENGE_LEN,
M_DEVBUF, 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,
u_int8_t *frm, u_int8_t *efrm, struct ieee80211_node *ni, int rssi,
u_int32_t rstamp, u_int16_t seq, u_int16_t status)
{
u_int8_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:
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_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_DEVBUF);
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,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
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, 0);
}
}
/* 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) do { \
if ((_len) < (_minlen)) { \
IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \
wh, ieee80211_mgt_subtype_name[subtype >> \
IEEE80211_FC0_SUBTYPE_SHIFT], \
"%s", "ie too short"); \
ic->ic_stats.is_rx_elem_toosmall++; \
return; \
} \
} while (0)
#ifdef IEEE80211_DEBUG
static void
ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag,
u_int8_t mac[IEEE80211_ADDR_LEN], u_int8_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) \
((u_int16_t) \
((((const u_int8_t *)(p))[0] ) | \
(((const u_int8_t *)(p))[1] << 8)))
#define LE_READ_4(p) \
((u_int32_t) \
((((const u_int8_t *)(p))[0] ) | \
(((const u_int8_t *)(p))[1] << 8) | \
(((const u_int8_t *)(p))[2] << 16) | \
(((const u_int8_t *)(p))[3] << 24)))
static int __inline
iswpaoui(const u_int8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
}
static int __inline
iswmeoui(const u_int8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI);
}
static int __inline
iswmeparam(const u_int8_t *frm)
{
return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
frm[6] == WME_PARAM_OUI_SUBTYPE;
}
static int __inline
iswmeinfo(const u_int8_t *frm)
{
return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
frm[6] == WME_INFO_OUI_SUBTYPE;
}
static int __inline
isatherosoui(const u_int8_t *frm)
{
return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
}
/*
* Convert a WPA cipher selector OUI to an internal
* cipher algorithm. Where appropriate we also
* record any key length.
*/
static int
wpa_cipher(u_int8_t *sel, u_int8_t *keylen)
{
#define WPA_SEL(x) (((x)<<24)|WPA_OUI)
u_int32_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(u_int8_t *sel)
{
#define WPA_SEL(x) (((x)<<24)|WPA_OUI)
u_int32_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, u_int8_t *frm,
struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
{
u_int8_t len = frm[1];
u_int32_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(u_int8_t *sel, u_int8_t *keylen)
{
#define RSN_SEL(x) (((x)<<24)|RSN_OUI)
u_int32_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(u_int8_t *sel)
{
#define RSN_SEL(x) (((x)<<24)|RSN_OUI)
u_int32_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, u_int8_t *frm,
struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh)
{
u_int8_t len = frm[1];
u_int32_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, u_int8_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
}
void
ieee80211_saveie(u_int8_t **iep, const u_int8_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_DEVBUF);
MALLOC(*iep, void*, ielen, M_DEVBUF, 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;
u_int8_t dsap;
u_int8_t ssap;
u_int8_t control;
u_int8_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);
m->m_pkthdr.rcvif = ifp;
ieee80211_deliver_data(ic, ni, m);
}
void
ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0,
struct ieee80211_node *ni,
int subtype, int rssi, u_int32_t rstamp)
{
#define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
#define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP)
struct ieee80211_frame *wh;
u_int8_t *frm, *efrm;
u_int8_t *ssid, *rates, *xrates, *wpa, *wme;
int reassoc, resp, allocbs;
u_int8_t rate;
wh = mtod(m0, struct ieee80211_frame *);
frm = (u_int8_t *)&wh[1];
efrm = mtod(m0, u_int8_t *) + m0->m_len;
switch (subtype) {
case IEEE80211_FC0_SUBTYPE_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
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 12);
memset(&scan, 0, sizeof(scan));
scan.tstamp = frm; frm += 8;
scan.bintval = le16toh(*(u_int16_t *)frm); frm += 2;
scan.capinfo = le16toh(*(u_int16_t *)frm); frm += 2;
scan.bchan = ieee80211_chan2ieee(ic, ic->ic_curchan);
scan.chan = scan.bchan;
while (frm < efrm) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1]);
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, u_int8_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_RSN:
scan.wpa = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(frm))
scan.wpa = frm;
else if (iswmeparam(frm) || iswmeinfo(frm))
scan.wme = frm;
/* XXX Atheros OUI support */
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);
IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN);
if (
#if IEEE80211_CHAN_MAX < 255
scan.chan > IEEE80211_CHAN_MAX ||
#endif
isclr(ic->ic_chan_active, scan.chan)) {
IEEE80211_DISCARD(ic,
IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
wh, ieee80211_mgt_subtype_name[subtype >>
IEEE80211_FC0_SUBTYPE_SHIFT],
"invalid channel %u", scan.chan);
ic->ic_stats.is_rx_badchan++;
return;
}
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;
}
/*
* 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 (ic->ic_curmode == IEEE80211_MODE_11G &&
(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,
ic->ic_curmode == IEEE80211_MODE_11A ||
(scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
ni->ni_capinfo = scan.capinfo;
/* 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.tim != NULL) {
struct ieee80211_tim_ie *ie =
(struct ieee80211_tim_ie *) scan.tim;
ni->ni_dtim_count = ie->tim_count;
ni->ni_dtim_period = ie->tim_period;
}
if (ic->ic_flags & IEEE80211_F_SCAN)
ieee80211_add_scan(ic, &scan, wh,
subtype, rssi, rstamp);
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, 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_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
*/
ssid = rates = xrates = NULL;
while (frm < efrm) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1]);
switch (*frm) {
case IEEE80211_ELEMID_SSID:
ssid = frm;
break;
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = frm;
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
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);
}
break;
case IEEE80211_FC0_SUBTYPE_AUTH: {
u_int16_t algo, seq, status;
/*
* auth frame format
* [2] algorithm
* [2] sequence
* [2] status
* [tlv*] challenge
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 6);
algo = le16toh(*(u_int16_t *)frm);
seq = le16toh(*(u_int16_t *)(frm + 2));
status = le16toh(*(u_int16_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,
rstamp, seq, status);
else if (algo == IEEE80211_AUTH_ALG_OPEN)
ieee80211_auth_open(ic, wh, ni, rssi, 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: {
u_int16_t capinfo, lintval;
struct ieee80211_rsnparms rsn;
u_int8_t reason;
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
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4));
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(*(u_int16_t *)frm); frm += 2;
lintval = le16toh(*(u_int16_t *)frm); frm += 2;
if (reassoc)
frm += 6; /* ignore current AP info */
ssid = rates = xrates = wpa = wme = NULL;
while (frm < efrm) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1]);
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:
wpa = frm;
break;
case IEEE80211_ELEMID_VENDOR:
if (iswpaoui(frm))
wpa = frm;
else if (iswmeinfo(frm))
wme = frm;
/* XXX Atheros OUI support */
break;
}
frm += frm[1] + 2;
}
IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
IEEE80211_VERIFY_SSID(ic->ic_bss, ssid);
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 associstion security credentials */
if (wpa == NULL && (ic->ic_flags & IEEE80211_F_WPA)) {
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);
/* XXX distinguish WPA/RSN? */
ic->ic_stats.is_rx_assoc_badwpaie++;
return;
}
if (wpa != NULL) {
/*
* Parse WPA 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.
*/
rsn = ni->ni_rsn;
if (wpa[0] != IEEE80211_ELEMID_RSN)
reason = ieee80211_parse_wpa(ic, wpa, &rsn, wh);
else
reason = ieee80211_parse_rsn(ic, wpa, &rsn, 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[0] != IEEE80211_ELEMID_RSN ? "WPA" : "RSN",
rsn.rsn_mcastcipher, rsn.rsn_mcastkeylen,
rsn.rsn_ucastcipher, rsn.rsn_ucastkeylen,
rsn.rsn_keymgmt, rsn.rsn_caps);
}
/* discard challenge after association */
if (ni->ni_challenge != NULL) {
FREE(ni->ni_challenge, M_DEVBUF);
ni->ni_challenge = NULL;
}
/* NB: 802.11 spec says to ignore station's privacy bit */
if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] deny %s request, capability mismatch 0x%x\n",
ether_sprintf(wh->i_addr2),
reassoc ? "reassoc" : "assoc", capinfo);
IEEE80211_SEND_MGMT(ic, ni, resp,
IEEE80211_STATUS_CAPINFO);
ieee80211_node_leave(ic, ni);
ic->ic_stats.is_rx_assoc_capmismatch++;
return;
}
rate = ieee80211_setup_rates(ni, rates, xrates,
IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
/*
* 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 ((rate & IEEE80211_RATE_BASIC) ||
((ic->ic_flags & IEEE80211_F_PUREG) && rate < 48)) {
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
"[%s] deny %s request, rate set mismatch\n",
ether_sprintf(wh->i_addr2),
reassoc ? "reassoc" : "assoc");
IEEE80211_SEND_MGMT(ic, ni, resp,
IEEE80211_STATUS_BASIC_RATE);
ieee80211_node_leave(ic, ni);
ic->ic_stats.is_rx_assoc_norate++;
return;
}
ni->ni_rssi = rssi;
ni->ni_rstamp = rstamp;
ni->ni_intval = lintval;
ni->ni_capinfo = capinfo;
ni->ni_chan = ic->ic_bss->ni_chan;
ni->ni_fhdwell = ic->ic_bss->ni_fhdwell;
ni->ni_fhindex = ic->ic_bss->ni_fhindex;
if (wpa != NULL) {
/*
* Record WPA/RSN parameters for station, mark
* node as using WPA and record information element
* for applications that require it.
*/
ni->ni_rsn = rsn;
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_DEVBUF);
ni->ni_wpa_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_DEVBUF);
ni->ni_wme_ie = NULL;
ni->ni_flags &= ~IEEE80211_NODE_QOS;
}
ieee80211_deliver_l2uf(ni);
ieee80211_node_join(ic, ni, resp);
break;
}
case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
u_int16_t capinfo, associd;
u_int16_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
*/
IEEE80211_VERIFY_LENGTH(efrm - frm, 6);
ni = ic->ic_bss;
capinfo = le16toh(*(u_int16_t *)frm);
frm += 2;
status = le16toh(*(u_int16_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(*(u_int16_t *)frm);
frm += 2;
rates = xrates = wpa = wme = NULL;
while (frm < efrm) {
IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1]);
switch (*frm) {
case IEEE80211_ELEMID_RATES:
rates = frm;
break;
case IEEE80211_ELEMID_XRATES:
xrates = 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);
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_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, 0);
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 (ic->ic_curmode == IEEE80211_MODE_11A ||
(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,
ic->ic_curmode == IEEE80211_MODE_11A ||
(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME));
/*
* Honor ERP protection.
*
* NB: ni_erp should zero for non-11g operation.
* XXX check ic_curmode anyway?
*/
if (ic->ic_curmode == IEEE80211_MODE_11G &&
(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\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_new_state(ic, IEEE80211_S_RUN, subtype);
break;
}
case IEEE80211_FC0_SUBTYPE_DEAUTH: {
u_int16_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);
reason = le16toh(*(u_int16_t *)frm);
ic->ic_stats.is_rx_deauth++;
IEEE80211_NODE_STAT(ni, rx_deauth);
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,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
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: {
u_int16_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);
reason = le16toh(*(u_int16_t *)frm);
ic->ic_stats.is_rx_disassoc++;
IEEE80211_NODE_STAT(ni, rx_disassoc);
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,
wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
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;
}
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
/*
* Handle station power-save state change.
*/
static void
ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable)
{
struct ieee80211com *ic = ni->ni_ic;
struct mbuf *m;
if (enable) {
if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0)
ic->ic_ps_sta++;
ni->ni_flags |= IEEE80211_NODE_PWR_MGT;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] power save mode on, %u sta's in ps mode\n",
ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta);
return;
}
if (ni->ni_flags & IEEE80211_NODE_PWR_MGT)
ic->ic_ps_sta--;
ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT;
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] power save mode off, %u sta's in ps mode\n",
ether_sprintf(ni->ni_macaddr), ic->ic_ps_sta);
/* XXX if no stations in ps mode, flush mc frames */
/*
* Flush queued unicast frames.
*/
if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) {
if (ic->ic_set_tim != NULL)
ic->ic_set_tim(ni, 0); /* just in case */
return;
}
IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
"[%s] flush ps queue, %u packets queued\n",
ether_sprintf(ni->ni_macaddr), IEEE80211_NODE_SAVEQ_QLEN(ni));
for (;;) {
int qlen;
IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen);
if (m == NULL)
break;
/*
* If this is the last packet, turn off the TIM bit.
* If there are more packets, set the more packets bit
* in the mbuf so ieee80211_encap will mark the 802.11
* head to indicate more data frames will follow.
*/
if (qlen != 0)
m->m_flags |= M_MORE_DATA;
/* XXX need different driver interface */
/* XXX bypasses q max */
IF_ENQUEUE(&ic->ic_ifp->if_snd, m);
}
if (ic->ic_set_tim != NULL)
ic->ic_set_tim(ni, 0);
}
/*
* 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;
u_int16_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(*(u_int16_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 u_int8_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 u_int8_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);
}
static 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");
}
static 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");
}
static void
ieee80211_discard_mac(struct ieee80211com *ic,
const u_int8_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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