c7c5399057
This showed up when testing the wtap module, as it attaches with no radiotap tx/rx configuration.
360 lines
9.9 KiB
C
360 lines
9.9 KiB
C
/*-
|
|
* Copyright (c) 2009 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("$FreeBSD$");
|
|
|
|
/*
|
|
* IEEE 802.11 radiotap support.
|
|
*/
|
|
#include "opt_wlan.h"
|
|
|
|
#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/bpf.h>
|
|
#include <net/if.h>
|
|
#include <net/if_llc.h>
|
|
#include <net/if_media.h>
|
|
|
|
#include <net80211/ieee80211_var.h>
|
|
|
|
static int radiotap_offset(struct ieee80211_radiotap_header *, int);
|
|
|
|
void
|
|
ieee80211_radiotap_attach(struct ieee80211com *ic,
|
|
struct ieee80211_radiotap_header *th, int tlen, uint32_t tx_radiotap,
|
|
struct ieee80211_radiotap_header *rh, int rlen, uint32_t rx_radiotap)
|
|
{
|
|
#define B(_v) (1<<(_v))
|
|
int off;
|
|
|
|
th->it_len = htole16(roundup2(tlen, sizeof(uint32_t)));
|
|
th->it_present = htole32(tx_radiotap);
|
|
ic->ic_th = th;
|
|
/* calculate offset to channel data */
|
|
off = -1;
|
|
if (tx_radiotap & B(IEEE80211_RADIOTAP_CHANNEL))
|
|
off = radiotap_offset(th, IEEE80211_RADIOTAP_CHANNEL);
|
|
else if (tx_radiotap & B(IEEE80211_RADIOTAP_XCHANNEL))
|
|
off = radiotap_offset(th, IEEE80211_RADIOTAP_XCHANNEL);
|
|
if (off == -1) {
|
|
if_printf(ic->ic_ifp, "%s: no tx channel, radiotap 0x%x\n",
|
|
__func__, tx_radiotap);
|
|
/* NB: we handle this case but data will have no chan spec */
|
|
} else
|
|
ic->ic_txchan = ((uint8_t *) th) + off;
|
|
|
|
rh->it_len = htole16(roundup2(rlen, sizeof(uint32_t)));
|
|
rh->it_present = htole32(rx_radiotap);
|
|
ic->ic_rh = rh;
|
|
/* calculate offset to channel data */
|
|
off = -1;
|
|
if (rx_radiotap & B(IEEE80211_RADIOTAP_CHANNEL))
|
|
off = radiotap_offset(rh, IEEE80211_RADIOTAP_CHANNEL);
|
|
else if (rx_radiotap & B(IEEE80211_RADIOTAP_XCHANNEL))
|
|
off = radiotap_offset(rh, IEEE80211_RADIOTAP_XCHANNEL);
|
|
if (off == -1) {
|
|
if_printf(ic->ic_ifp, "%s: no rx channel, radiotap 0x%x\n",
|
|
__func__, rx_radiotap);
|
|
/* NB: we handle this case but data will have no chan spec */
|
|
} else
|
|
ic->ic_rxchan = ((uint8_t *) rh) + off;
|
|
#undef B
|
|
}
|
|
|
|
void
|
|
ieee80211_radiotap_detach(struct ieee80211com *ic)
|
|
{
|
|
}
|
|
|
|
void
|
|
ieee80211_radiotap_vattach(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211com *ic = vap->iv_ic;
|
|
struct ieee80211_radiotap_header *th = ic->ic_th;
|
|
|
|
if (th != NULL && ic->ic_rh != NULL) {
|
|
/* radiotap DLT for raw 802.11 frames */
|
|
bpfattach2(vap->iv_ifp, DLT_IEEE802_11_RADIO,
|
|
sizeof(struct ieee80211_frame) + le16toh(th->it_len),
|
|
&vap->iv_rawbpf);
|
|
}
|
|
}
|
|
|
|
void
|
|
ieee80211_radiotap_vdetach(struct ieee80211vap *vap)
|
|
{
|
|
/* NB: bpfattach is called by ether_ifdetach and claims all taps */
|
|
}
|
|
|
|
static void
|
|
set_channel(void *p, const struct ieee80211_channel *c)
|
|
{
|
|
struct {
|
|
uint16_t freq;
|
|
uint16_t flags;
|
|
} *rc = p;
|
|
|
|
rc->freq = htole16(c->ic_freq);
|
|
rc->flags = htole16(c->ic_flags);
|
|
}
|
|
|
|
static void
|
|
set_xchannel(void *p, const struct ieee80211_channel *c)
|
|
{
|
|
struct {
|
|
uint32_t flags;
|
|
uint16_t freq;
|
|
uint8_t ieee;
|
|
uint8_t maxpow;
|
|
} *rc = p;
|
|
|
|
rc->flags = htole32(c->ic_flags);
|
|
rc->freq = htole16(c->ic_freq);
|
|
rc->ieee = c->ic_ieee;
|
|
rc->maxpow = c->ic_maxregpower;
|
|
}
|
|
|
|
/*
|
|
* Update radiotap state on channel change.
|
|
*/
|
|
void
|
|
ieee80211_radiotap_chan_change(struct ieee80211com *ic)
|
|
{
|
|
if (ic->ic_rxchan != NULL) {
|
|
struct ieee80211_radiotap_header *rh = ic->ic_rh;
|
|
|
|
if (rh->it_present & htole32(1<<IEEE80211_RADIOTAP_XCHANNEL))
|
|
set_xchannel(ic->ic_rxchan, ic->ic_curchan);
|
|
else if (rh->it_present & htole32(1<<IEEE80211_RADIOTAP_CHANNEL))
|
|
set_channel(ic->ic_rxchan, ic->ic_curchan);
|
|
}
|
|
if (ic->ic_txchan != NULL) {
|
|
struct ieee80211_radiotap_header *th = ic->ic_th;
|
|
|
|
if (th->it_present & htole32(1<<IEEE80211_RADIOTAP_XCHANNEL))
|
|
set_xchannel(ic->ic_txchan, ic->ic_curchan);
|
|
else if (th->it_present & htole32(1<<IEEE80211_RADIOTAP_CHANNEL))
|
|
set_channel(ic->ic_txchan, ic->ic_curchan);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Distribute radiotap data (+packet) to all monitor mode
|
|
* vaps with an active tap other than vap0.
|
|
*/
|
|
static void
|
|
spam_vaps(struct ieee80211vap *vap0, struct mbuf *m,
|
|
struct ieee80211_radiotap_header *rh, int len)
|
|
{
|
|
struct ieee80211com *ic = vap0->iv_ic;
|
|
struct ieee80211vap *vap;
|
|
|
|
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
|
|
if (vap != vap0 &&
|
|
vap->iv_opmode == IEEE80211_M_MONITOR &&
|
|
(vap->iv_flags_ext & IEEE80211_FEXT_BPF) &&
|
|
vap->iv_state != IEEE80211_S_INIT)
|
|
bpf_mtap2(vap->iv_rawbpf, rh, len, m);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Dispatch radiotap data for transmitted packet.
|
|
*/
|
|
void
|
|
ieee80211_radiotap_tx(struct ieee80211vap *vap0, struct mbuf *m)
|
|
{
|
|
struct ieee80211com *ic = vap0->iv_ic;
|
|
struct ieee80211_radiotap_header *th = ic->ic_th;
|
|
int len;
|
|
|
|
KASSERT(th != NULL, ("no tx radiotap header"));
|
|
len = le16toh(th->it_len);
|
|
|
|
if (vap0->iv_flags_ext & IEEE80211_FEXT_BPF)
|
|
bpf_mtap2(vap0->iv_rawbpf, th, len, m);
|
|
/*
|
|
* Spam monitor mode vaps.
|
|
*/
|
|
if (ic->ic_montaps != 0)
|
|
spam_vaps(vap0, m, th, len);
|
|
}
|
|
|
|
/*
|
|
* Dispatch radiotap data for received packet.
|
|
*/
|
|
void
|
|
ieee80211_radiotap_rx(struct ieee80211vap *vap0, struct mbuf *m)
|
|
{
|
|
struct ieee80211com *ic = vap0->iv_ic;
|
|
struct ieee80211_radiotap_header *rh = ic->ic_rh;
|
|
int len;
|
|
|
|
KASSERT(rh != NULL, ("no rx radiotap header"));
|
|
len = le16toh(rh->it_len);
|
|
|
|
if (vap0->iv_flags_ext & IEEE80211_FEXT_BPF)
|
|
bpf_mtap2(vap0->iv_rawbpf, rh, len, m);
|
|
/*
|
|
* Spam monitor mode vaps with unicast frames. Multicast
|
|
* frames are handled by passing through ieee80211_input_all
|
|
* which distributes copies to the monitor mode vaps.
|
|
*/
|
|
if (ic->ic_montaps != 0 && (m->m_flags & M_BCAST) == 0)
|
|
spam_vaps(vap0, m, rh, len);
|
|
}
|
|
|
|
/*
|
|
* Dispatch radiotap data for a packet received outside the normal
|
|
* rx processing path; this is used, for example, to handle frames
|
|
* received with errors that would otherwise be dropped.
|
|
*/
|
|
void
|
|
ieee80211_radiotap_rx_all(struct ieee80211com *ic, struct mbuf *m)
|
|
{
|
|
struct ieee80211_radiotap_header *rh = ic->ic_rh;
|
|
int len = le16toh(rh->it_len);
|
|
struct ieee80211vap *vap;
|
|
|
|
/* XXX locking? */
|
|
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
|
|
if (ieee80211_radiotap_active_vap(vap) &&
|
|
vap->iv_state != IEEE80211_S_INIT)
|
|
bpf_mtap2(vap->iv_rawbpf, rh, len, m);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return the offset of the specified item in the radiotap
|
|
* header description. If the item is not present or is not
|
|
* known -1 is returned.
|
|
*/
|
|
static int
|
|
radiotap_offset(struct ieee80211_radiotap_header *rh, int item)
|
|
{
|
|
static const struct {
|
|
size_t align, width;
|
|
} items[] = {
|
|
[IEEE80211_RADIOTAP_TSFT] = {
|
|
.align = sizeof(uint64_t),
|
|
.width = sizeof(uint64_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_FLAGS] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = sizeof(uint8_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_RATE] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = sizeof(uint8_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_CHANNEL] = {
|
|
.align = sizeof(uint16_t),
|
|
.width = 2*sizeof(uint16_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_FHSS] = {
|
|
.align = sizeof(uint16_t),
|
|
.width = sizeof(uint16_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_DBM_ANTSIGNAL] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = sizeof(uint8_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_DBM_ANTNOISE] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = sizeof(uint8_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_LOCK_QUALITY] = {
|
|
.align = sizeof(uint16_t),
|
|
.width = sizeof(uint16_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_TX_ATTENUATION] = {
|
|
.align = sizeof(uint16_t),
|
|
.width = sizeof(uint16_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_DB_TX_ATTENUATION] = {
|
|
.align = sizeof(uint16_t),
|
|
.width = sizeof(uint16_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_DBM_TX_POWER] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = sizeof(uint8_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_ANTENNA] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = sizeof(uint8_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_DB_ANTSIGNAL] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = sizeof(uint8_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_DB_ANTNOISE] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = sizeof(uint8_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_XCHANNEL] = {
|
|
.align = sizeof(uint32_t),
|
|
.width = 2*sizeof(uint32_t),
|
|
},
|
|
[IEEE80211_RADIOTAP_MCS] = {
|
|
.align = sizeof(uint8_t),
|
|
.width = 3*sizeof(uint8_t),
|
|
},
|
|
};
|
|
uint32_t present = le32toh(rh->it_present);
|
|
int off, i;
|
|
|
|
off = sizeof(struct ieee80211_radiotap_header);
|
|
for (i = 0; i < IEEE80211_RADIOTAP_EXT; i++) {
|
|
if ((present & (1<<i)) == 0)
|
|
continue;
|
|
if (items[i].align == 0) {
|
|
/* NB: unidentified element, don't guess */
|
|
printf("%s: unknown item %d\n", __func__, i);
|
|
return -1;
|
|
}
|
|
off = roundup2(off, items[i].align);
|
|
if (i == item) {
|
|
if (off + items[i].width > le16toh(rh->it_len)) {
|
|
/* NB: item does not fit in header data */
|
|
printf("%s: item %d not in header data, "
|
|
"off %d width %zu len %d\n", __func__, i,
|
|
off, items[i].width, le16toh(rh->it_len));
|
|
return -1;
|
|
}
|
|
return off;
|
|
}
|
|
off += items[i].width;
|
|
}
|
|
return -1;
|
|
}
|