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freebsd-dev/sys/dev/wtap/if_wtap.c
Pedro F. Giffuni 718cf2ccb9 sys/dev: further adoption of SPDX licensing ID tags. 
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-27 14:52:40 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2010-2011 Monthadar Al Jaberi, TerraNet AB
* All rights reserved.
*
* Copyright (c) 2002-2009 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,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any
* redistribution must be conditioned upon including a substantially
* similar Disclaimer requirement for further binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*
* $FreeBSD$
*/
#include "if_wtapvar.h"
#include <sys/uio.h> /* uio struct */
#include <sys/jail.h>
#include <net/if_var.h>
#include <net/vnet.h>
#include <net80211/ieee80211_ratectl.h>
#include "if_medium.h"
/*
* This _requires_ vimage to be useful.
*/
#ifndef VIMAGE
#error if_wtap requires VIMAGE.
#endif /* VIMAGE */
/* device for IOCTL and read/write for debuggin purposes */
/* Function prototypes */
static d_open_t wtap_node_open;
static d_close_t wtap_node_close;
static d_write_t wtap_node_write;
static d_ioctl_t wtap_node_ioctl;
static struct cdevsw wtap_cdevsw = {
.d_version = D_VERSION,
.d_flags = 0,
.d_open = wtap_node_open,
.d_close = wtap_node_close,
.d_write = wtap_node_write,
.d_ioctl = wtap_node_ioctl,
.d_name = "wtapnode",
};
static int
wtap_node_open(struct cdev *dev, int oflags, int devtype, struct thread *p)
{
int err = 0;
uprintf("Opened device \"echo\" successfully.\n");
return(err);
}
static int
wtap_node_close(struct cdev *dev, int fflag, int devtype, struct thread *p)
{
uprintf("Closing device \"echo.\"\n");
return(0);
}
static int
wtap_node_write(struct cdev *dev, struct uio *uio, int ioflag)
{
int err = 0;
struct mbuf *m;
struct ifnet *ifp;
struct wtap_softc *sc;
uint8_t buf[1024];
int buf_len;
uprintf("write device %s \"echo.\"\n", devtoname(dev));
buf_len = MIN(uio->uio_iov->iov_len, 1024);
err = copyin(uio->uio_iov->iov_base, buf, buf_len);
if (err != 0) {
uprintf("Write failed: bad address!\n");
return (err);
}
MGETHDR(m, M_NOWAIT, MT_DATA);
m_copyback(m, 0, buf_len, buf);
CURVNET_SET(TD_TO_VNET(curthread));
IFNET_RLOCK_NOSLEEP();
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
printf("ifp->if_xname = %s\n", ifp->if_xname);
if(strcmp(devtoname(dev), ifp->if_xname) == 0){
printf("found match, correspoding wtap = %s\n",
ifp->if_xname);
sc = (struct wtap_softc *)ifp->if_softc;
printf("wtap id = %d\n", sc->id);
wtap_inject(sc, m);
}
}
IFNET_RUNLOCK_NOSLEEP();
CURVNET_RESTORE();
return(err);
}
int
wtap_node_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
int fflag, struct thread *td)
{
int error = 0;
switch(cmd) {
default:
DWTAP_PRINTF("Unknown WTAP IOCTL\n");
error = EINVAL;
}
return error;
}
static int wtap_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
const struct ieee80211_bpf_params *params);
static int
wtap_medium_enqueue(struct wtap_vap *avp, struct mbuf *m)
{
return medium_transmit(avp->av_md, avp->id, m);
}
static int
wtap_media_change(struct ifnet *ifp)
{
DWTAP_PRINTF("%s\n", __func__);
int error = ieee80211_media_change(ifp);
/* NB: only the fixed rate can change and that doesn't need a reset */
return (error == ENETRESET ? 0 : error);
}
/*
* Intercept management frames to collect beacon rssi data
* and to do ibss merges.
*/
static void
wtap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m,
int subtype, const struct ieee80211_rx_stats *stats, int rssi, int nf)
{
struct ieee80211vap *vap = ni->ni_vap;
#if 0
DWTAP_PRINTF("[%d] %s\n", myath_id(ni), __func__);
#endif
WTAP_VAP(vap)->av_recv_mgmt(ni, m, subtype, stats, rssi, nf);
}
static int
wtap_reset_vap(struct ieee80211vap *vap, u_long cmd)
{
DWTAP_PRINTF("%s\n", __func__);
return 0;
}
static void
wtap_beacon_update(struct ieee80211vap *vap, int item)
{
struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
DWTAP_PRINTF("%s\n", __func__);
setbit(bo->bo_flags, item);
}
/*
* Allocate and setup an initial beacon frame.
*/
static int
wtap_beacon_alloc(struct wtap_softc *sc, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct wtap_vap *avp = WTAP_VAP(vap);
DWTAP_PRINTF("[%s] %s\n", ether_sprintf(ni->ni_macaddr), __func__);
/*
* NB: the beacon data buffer must be 32-bit aligned;
* we assume the mbuf routines will return us something
* with this alignment (perhaps should assert).
*/
avp->beacon = ieee80211_beacon_alloc(ni);
if (avp->beacon == NULL) {
printf("%s: cannot get mbuf\n", __func__);
return ENOMEM;
}
callout_init(&avp->av_swba, 0);
avp->bf_node = ieee80211_ref_node(ni);
return 0;
}
static void
wtap_beacon_config(struct wtap_softc *sc, struct ieee80211vap *vap)
{
DWTAP_PRINTF("%s\n", __func__);
}
static void
wtap_beacon_intrp(void *arg)
{
struct wtap_vap *avp = arg;
struct ieee80211vap *vap = arg;
struct mbuf *m;
if (vap->iv_state < IEEE80211_S_RUN) {
DWTAP_PRINTF("Skip beacon, not running, state %d", vap->iv_state);
return ;
}
DWTAP_PRINTF("[%d] beacon intrp\n", avp->id); //burst mode
/*
* Update dynamic beacon contents. If this returns
* non-zero then we need to remap the memory because
* the beacon frame changed size (probably because
* of the TIM bitmap).
*/
m = m_dup(avp->beacon, M_NOWAIT);
if (ieee80211_beacon_update(avp->bf_node, m, 0)) {
printf("%s, need to remap the memory because the beacon frame"
" changed size.\n",__func__);
}
if (ieee80211_radiotap_active_vap(vap))
ieee80211_radiotap_tx(vap, m);
#if 0
medium_transmit(avp->av_md, avp->id, m);
#endif
wtap_medium_enqueue(avp, m);
callout_schedule(&avp->av_swba, avp->av_bcinterval);
}
static int
wtap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
{
struct ieee80211com *ic = vap->iv_ic;
struct wtap_softc *sc = ic->ic_softc;
struct wtap_vap *avp = WTAP_VAP(vap);
struct ieee80211_node *ni = NULL;
int error;
DWTAP_PRINTF("%s\n", __func__);
ni = ieee80211_ref_node(vap->iv_bss);
/*
* Invoke the parent method to do net80211 work.
*/
error = avp->av_newstate(vap, nstate, arg);
if (error != 0)
goto bad;
if (nstate == IEEE80211_S_RUN) {
/* NB: collect bss node again, it may have changed */
ieee80211_free_node(ni);
ni = ieee80211_ref_node(vap->iv_bss);
switch (vap->iv_opmode) {
case IEEE80211_M_MBSS:
error = wtap_beacon_alloc(sc, ni);
if (error != 0)
goto bad;
wtap_beacon_config(sc, vap);
callout_reset(&avp->av_swba, avp->av_bcinterval,
wtap_beacon_intrp, vap);
break;
default:
goto bad;
}
} else if (nstate == IEEE80211_S_INIT) {
callout_stop(&avp->av_swba);
}
ieee80211_free_node(ni);
return 0;
bad:
printf("%s: bad\n", __func__);
ieee80211_free_node(ni);
return error;
}
static void
wtap_bmiss(struct ieee80211vap *vap)
{
struct wtap_vap *avp = (struct wtap_vap *)vap;
DWTAP_PRINTF("%s\n", __func__);
avp->av_bmiss(vap);
}
static struct ieee80211vap *
wtap_vap_create(struct ieee80211com *ic, const char name[IFNAMSIZ],
int unit, enum ieee80211_opmode opmode, int flags,
const uint8_t bssid[IEEE80211_ADDR_LEN],
const uint8_t mac[IEEE80211_ADDR_LEN])
{
struct wtap_softc *sc = ic->ic_softc;
struct ieee80211vap *vap;
struct wtap_vap *avp;
int error;
struct ieee80211_node *ni;
DWTAP_PRINTF("%s\n", __func__);
avp = malloc(sizeof(struct wtap_vap), M_80211_VAP, M_WAITOK | M_ZERO);
avp->id = sc->id;
avp->av_md = sc->sc_md;
avp->av_bcinterval = msecs_to_ticks(BEACON_INTRERVAL + 100*sc->id);
vap = (struct ieee80211vap *) avp;
error = ieee80211_vap_setup(ic, vap, name, unit, IEEE80211_M_MBSS,
flags | IEEE80211_CLONE_NOBEACONS, bssid);
if (error) {
free(avp, M_80211_VAP);
return (NULL);
}
/* override various methods */
avp->av_recv_mgmt = vap->iv_recv_mgmt;
vap->iv_recv_mgmt = wtap_recv_mgmt;
vap->iv_reset = wtap_reset_vap;
vap->iv_update_beacon = wtap_beacon_update;
avp->av_newstate = vap->iv_newstate;
vap->iv_newstate = wtap_newstate;
avp->av_bmiss = vap->iv_bmiss;
vap->iv_bmiss = wtap_bmiss;
/* complete setup */
ieee80211_vap_attach(vap, wtap_media_change, ieee80211_media_status,
mac);
avp->av_dev = make_dev(&wtap_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
"%s", (const char *)sc->name);
/* TODO this is a hack to force it to choose the rate we want */
ni = ieee80211_ref_node(vap->iv_bss);
ni->ni_txrate = 130;
ieee80211_free_node(ni);
return vap;
}
static void
wtap_vap_delete(struct ieee80211vap *vap)
{
struct wtap_vap *avp = WTAP_VAP(vap);
DWTAP_PRINTF("%s\n", __func__);
destroy_dev(avp->av_dev);
callout_stop(&avp->av_swba);
ieee80211_vap_detach(vap);
free((struct wtap_vap*) vap, M_80211_VAP);
}
static void
wtap_parent(struct ieee80211com *ic)
{
struct wtap_softc *sc = ic->ic_softc;
if (ic->ic_nrunning > 0) {
sc->up = 1;
ieee80211_start_all(ic);
} else
sc->up = 0;
}
static void
wtap_scan_start(struct ieee80211com *ic)
{
#if 0
DWTAP_PRINTF("%s\n", __func__);
#endif
}
static void
wtap_scan_end(struct ieee80211com *ic)
{
#if 0
DWTAP_PRINTF("%s\n", __func__);
#endif
}
static void
wtap_set_channel(struct ieee80211com *ic)
{
#if 0
DWTAP_PRINTF("%s\n", __func__);
#endif
}
static int
wtap_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
const struct ieee80211_bpf_params *params)
{
#if 0
DWTAP_PRINTF("%s, %p\n", __func__, m);
#endif
struct ieee80211vap *vap = ni->ni_vap;
struct wtap_vap *avp = WTAP_VAP(vap);
if (ieee80211_radiotap_active_vap(vap)) {
ieee80211_radiotap_tx(vap, m);
}
if (m->m_flags & M_TXCB)
ieee80211_process_callback(ni, m, 0);
ieee80211_free_node(ni);
return wtap_medium_enqueue(avp, m);
}
void
wtap_inject(struct wtap_softc *sc, struct mbuf *m)
{
struct wtap_buf *bf = (struct wtap_buf *)malloc(sizeof(struct wtap_buf),
M_WTAP_RXBUF, M_NOWAIT | M_ZERO);
KASSERT(bf != NULL, ("could not allocated a new wtap_buf\n"));
bf->m = m;
mtx_lock(&sc->sc_mtx);
STAILQ_INSERT_TAIL(&sc->sc_rxbuf, bf, bf_list);
taskqueue_enqueue(sc->sc_tq, &sc->sc_rxtask);
mtx_unlock(&sc->sc_mtx);
}
void
wtap_rx_deliver(struct wtap_softc *sc, struct mbuf *m)
{
struct ieee80211com *ic = &sc->sc_ic;
struct ieee80211_node *ni;
int type;
#if 0
DWTAP_PRINTF("%s\n", __func__);
#endif
DWTAP_PRINTF("[%d] receiving m=%p\n", sc->id, m);
if (m == NULL) { /* NB: shouldn't happen */
ic_printf(ic, "%s: no mbuf!\n", __func__);
}
ieee80211_dump_pkt(ic, mtod(m, caddr_t), 0,0,0);
/*
* Locate the node for sender, track state, and then
* pass the (referenced) node up to the 802.11 layer
* for its use.
*/
ni = ieee80211_find_rxnode_withkey(ic,
mtod(m, const struct ieee80211_frame_min *),IEEE80211_KEYIX_NONE);
if (ni != NULL) {
/*
* Sending station is known, dispatch directly.
*/
type = ieee80211_input(ni, m, 1<<7, 10);
ieee80211_free_node(ni);
} else {
type = ieee80211_input_all(ic, m, 1<<7, 10);
}
}
static void
wtap_rx_proc(void *arg, int npending)
{
struct wtap_softc *sc = (struct wtap_softc *)arg;
struct ieee80211com *ic = &sc->sc_ic;
struct mbuf *m;
struct ieee80211_node *ni;
int type;
struct wtap_buf *bf;
#if 0
DWTAP_PRINTF("%s\n", __func__);
#endif
for(;;) {
mtx_lock(&sc->sc_mtx);
bf = STAILQ_FIRST(&sc->sc_rxbuf);
if (bf == NULL) {
mtx_unlock(&sc->sc_mtx);
return;
}
STAILQ_REMOVE_HEAD(&sc->sc_rxbuf, bf_list);
mtx_unlock(&sc->sc_mtx);
KASSERT(bf != NULL, ("wtap_buf is NULL\n"));
m = bf->m;
DWTAP_PRINTF("[%d] receiving m=%p\n", sc->id, bf->m);
if (m == NULL) { /* NB: shouldn't happen */
ic_printf(ic, "%s: no mbuf!\n", __func__);
free(bf, M_WTAP_RXBUF);
return;
}
#if 0
ieee80211_dump_pkt(ic, mtod(m, caddr_t), 0,0,0);
#endif
/*
* Locate the node for sender, track state, and then
* pass the (referenced) node up to the 802.11 layer
* for its use.
*/
ni = ieee80211_find_rxnode_withkey(ic,
mtod(m, const struct ieee80211_frame_min *),
IEEE80211_KEYIX_NONE);
if (ni != NULL) {
/*
* Sending station is known, dispatch directly.
*/
type = ieee80211_input(ni, m, 1<<7, 10);
ieee80211_free_node(ni);
} else {
type = ieee80211_input_all(ic, m, 1<<7, 10);
}
/* The mbufs are freed by the Net80211 stack */
free(bf, M_WTAP_RXBUF);
}
}
static void
wtap_newassoc(struct ieee80211_node *ni, int isnew)
{
DWTAP_PRINTF("%s\n", __func__);
}
/*
* Callback from the 802.11 layer to update WME parameters.
*/
static int
wtap_wme_update(struct ieee80211com *ic)
{
DWTAP_PRINTF("%s\n", __func__);
return 0;
}
static void
wtap_update_mcast(struct ieee80211com *ic)
{
DWTAP_PRINTF("%s\n", __func__);
}
static void
wtap_update_promisc(struct ieee80211com *ic)
{
DWTAP_PRINTF("%s\n", __func__);
}
static int
wtap_transmit(struct ieee80211com *ic, struct mbuf *m)
{
struct ieee80211_node *ni =
(struct ieee80211_node *) m->m_pkthdr.rcvif;
struct ieee80211vap *vap = ni->ni_vap;
struct wtap_vap *avp = WTAP_VAP(vap);
if(ni == NULL){
printf("m->m_pkthdr.rcvif is NULL we cant radiotap_tx\n");
}else{
if (ieee80211_radiotap_active_vap(vap))
ieee80211_radiotap_tx(vap, m);
}
if (m->m_flags & M_TXCB)
ieee80211_process_callback(ni, m, 0);
ieee80211_free_node(ni);
return wtap_medium_enqueue(avp, m);
}
static struct ieee80211_node *
wtap_node_alloc(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN])
{
struct ieee80211_node *ni;
DWTAP_PRINTF("%s\n", __func__);
ni = malloc(sizeof(struct ieee80211_node), M_80211_NODE,
M_NOWAIT|M_ZERO);
ni->ni_txrate = 130;
return ni;
}
static void
wtap_node_free(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
struct wtap_softc *sc = ic->ic_softc;
DWTAP_PRINTF("%s\n", __func__);
sc->sc_node_free(ni);
}
int32_t
wtap_attach(struct wtap_softc *sc, const uint8_t *macaddr)
{
struct ieee80211com *ic = &sc->sc_ic;
DWTAP_PRINTF("%s\n", __func__);
sc->up = 0;
STAILQ_INIT(&sc->sc_rxbuf);
sc->sc_tq = taskqueue_create("wtap_taskq", M_NOWAIT | M_ZERO,
taskqueue_thread_enqueue, &sc->sc_tq);
taskqueue_start_threads(&sc->sc_tq, 1, PI_SOFT, "%s taskQ", sc->name);
TASK_INIT(&sc->sc_rxtask, 0, wtap_rx_proc, sc);
ic->ic_softc = sc;
ic->ic_name = sc->name;
ic->ic_phytype = IEEE80211_T_DS;
ic->ic_opmode = IEEE80211_M_MBSS;
ic->ic_caps = IEEE80211_C_MBSS;
ic->ic_max_keyix = 128; /* A value read from Atheros ATH_KEYMAX */
ic->ic_regdomain.regdomain = SKU_ETSI;
ic->ic_regdomain.country = CTRY_SWEDEN;
ic->ic_regdomain.location = 1; /* Indoors */
ic->ic_regdomain.isocc[0] = 'S';
ic->ic_regdomain.isocc[1] = 'E';
ic->ic_nchans = 1;
ic->ic_channels[0].ic_flags = IEEE80211_CHAN_B;
ic->ic_channels[0].ic_freq = 2412;
IEEE80211_ADDR_COPY(ic->ic_macaddr, macaddr);
ieee80211_ifattach(ic);
/* override default methods */
ic->ic_newassoc = wtap_newassoc;
ic->ic_wme.wme_update = wtap_wme_update;
ic->ic_vap_create = wtap_vap_create;
ic->ic_vap_delete = wtap_vap_delete;
ic->ic_raw_xmit = wtap_raw_xmit;
ic->ic_update_mcast = wtap_update_mcast;
ic->ic_update_promisc = wtap_update_promisc;
ic->ic_transmit = wtap_transmit;
ic->ic_parent = wtap_parent;
sc->sc_node_alloc = ic->ic_node_alloc;
ic->ic_node_alloc = wtap_node_alloc;
sc->sc_node_free = ic->ic_node_free;
ic->ic_node_free = wtap_node_free;
ic->ic_scan_start = wtap_scan_start;
ic->ic_scan_end = wtap_scan_end;
ic->ic_set_channel = wtap_set_channel;
ieee80211_radiotap_attach(ic,
&sc->sc_tx_th.wt_ihdr, sizeof(sc->sc_tx_th),
WTAP_TX_RADIOTAP_PRESENT,
&sc->sc_rx_th.wr_ihdr, sizeof(sc->sc_rx_th),
WTAP_RX_RADIOTAP_PRESENT);
/* Work here, we must find a way to populate the rate table */
#if 0
if(ic->ic_rt == NULL){
printf("no table for ic_curchan\n");
ic->ic_rt = ieee80211_get_ratetable(&ic->ic_channels[0]);
}
printf("ic->ic_rt =%p\n", ic->ic_rt);
printf("rate count %d\n", ic->ic_rt->rateCount);
uint8_t code = ic->ic_rt->info[0].dot11Rate;
uint8_t cix = ic->ic_rt->info[0].ctlRateIndex;
uint8_t ctl_rate = ic->ic_rt->info[cix].dot11Rate;
printf("code=%d, cix=%d, ctl_rate=%d\n", code, cix, ctl_rate);
uint8_t rix0 = ic->ic_rt->rateCodeToIndex[130];
uint8_t rix1 = ic->ic_rt->rateCodeToIndex[132];
uint8_t rix2 = ic->ic_rt->rateCodeToIndex[139];
uint8_t rix3 = ic->ic_rt->rateCodeToIndex[150];
printf("rix0 %u,rix1 %u,rix2 %u,rix3 %u\n", rix0,rix1,rix2,rix3);
printf("lpAckDuration=%u\n", ic->ic_rt->info[0].lpAckDuration);
printf("rate=%d\n", ic->ic_rt->info[0].rateKbps);
#endif
return 0;
}
int32_t
wtap_detach(struct wtap_softc *sc)
{
struct ieee80211com *ic = &sc->sc_ic;
DWTAP_PRINTF("%s\n", __func__);
ieee80211_ageq_drain(&ic->ic_stageq);
ieee80211_ifdetach(ic);
return 0;
}
void
wtap_resume(struct wtap_softc *sc)
{
DWTAP_PRINTF("%s\n", __func__);
}
void
wtap_suspend(struct wtap_softc *sc)
{
DWTAP_PRINTF("%s\n", __func__);
}
void
wtap_shutdown(struct wtap_softc *sc)
{
DWTAP_PRINTF("%s\n", __func__);
}
void
wtap_intr(struct wtap_softc *sc)
{
DWTAP_PRINTF("%s\n", __func__);
}
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