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NetBSD/sys/net/if_tun.c

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/* $NetBSD: if_tun.c,v 1.68 2004/03/01 13:54:02 tron Exp $ */
/*
* Copyright (c) 1988, Julian Onions <jpo@cs.nott.ac.uk>
* Nottingham University 1987.
*
* This source may be freely distributed, however I would be interested
* in any changes that are made.
*
* This driver takes packets off the IP i/f and hands them up to a
* user process to have its wicked way with. This driver has its
* roots in a similar driver written by Phil Cockcroft (formerly) at
* UCL. This driver is based much more on read/write/poll mode of
* operation though.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_tun.c,v 1.68 2004/03/01 13:54:02 tron Exp $");
#include "tun.h"
#include "opt_inet.h"
#include "opt_ns.h"
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/buf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/select.h>
#include <sys/poll.h>
#include <sys/file.h>
#include <sys/signalvar.h>
#include <sys/conf.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/if_ether.h>
#include <net/netisr.h>
#include <net/route.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_inarp.h>
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#include "bpfilter.h"
#if NBPFILTER > 0
#include <sys/time.h>
#include <net/bpf.h>
#endif
#include <net/if_tun.h>
#define TUNDEBUG if (tundebug) printf
int tundebug = 0;
extern int ifqmaxlen;
void tunattach __P((int));
LIST_HEAD(, tun_softc) tun_softc_list;
static struct simplelock tun_softc_lock;
int tun_ioctl __P((struct ifnet *, u_long, caddr_t));
int tun_output __P((struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *rt));
int tun_clone_create __P((struct if_clone *, int));
void tun_clone_destroy __P((struct ifnet *));
struct if_clone tun_cloner =
IF_CLONE_INITIALIZER("tun", tun_clone_create, tun_clone_destroy);
static void tunattach0 __P((struct tun_softc *));
static void tuninit __P((struct tun_softc *));
#ifdef ALTQ
static void tunstart __P((struct ifnet *));
#endif
static struct tun_softc *tun_find_unit __P((dev_t));
dev_type_open(tunopen);
dev_type_close(tunclose);
dev_type_read(tunread);
dev_type_write(tunwrite);
dev_type_ioctl(tunioctl);
dev_type_poll(tunpoll);
dev_type_kqfilter(tunkqfilter);
const struct cdevsw tun_cdevsw = {
tunopen, tunclose, tunread, tunwrite, tunioctl,
nostop, notty, tunpoll, nommap, tunkqfilter,
};
void
tunattach(unused)
int unused;
{
simple_lock_init(&tun_softc_lock);
LIST_INIT(&tun_softc_list);
if_clone_attach(&tun_cloner);
}
int
tun_clone_create(ifc, unit)
struct if_clone *ifc;
int unit;
{
struct tun_softc *sc;
sc = malloc(sizeof(struct tun_softc), M_DEVBUF, M_WAITOK);
(void)memset(sc, 0, sizeof(struct tun_softc));
(void)snprintf(sc->tun_if.if_xname, sizeof(sc->tun_if.if_xname),
"%s%d", ifc->ifc_name, unit);
sc->tun_unit = unit;
simple_lock_init(&sc->tun_lock);
tunattach0(sc);
simple_lock(&tun_softc_lock);
LIST_INSERT_HEAD(&tun_softc_list, sc, tun_list);
simple_unlock(&tun_softc_lock);
return (0);
}
void
tunattach0(sc)
struct tun_softc *sc;
{
struct ifnet *ifp = (void *)sc;
sc->tun_flags = TUN_INITED;
ifp = &sc->tun_if;
ifp->if_softc = sc;
ifp->if_mtu = TUNMTU;
ifp->if_ioctl = tun_ioctl;
ifp->if_output = tun_output;
#ifdef ALTQ
ifp->if_start = tunstart;
#endif
ifp->if_flags = IFF_POINTOPOINT;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
ifp->if_collisions = 0;
ifp->if_ierrors = 0;
ifp->if_oerrors = 0;
ifp->if_ipackets = 0;
ifp->if_opackets = 0;
ifp->if_ibytes = 0;
ifp->if_obytes = 0;
ifp->if_dlt = DLT_NULL;
IFQ_SET_READY(&ifp->if_snd);
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
#endif
}
void
tun_clone_destroy(ifp)
struct ifnet *ifp;
{
struct tun_softc *tp = (void *)ifp;
simple_lock(&tun_softc_lock);
simple_lock(&tp->tun_lock);
LIST_REMOVE(tp, tun_list);
simple_unlock(&tp->tun_lock);
simple_unlock(&tun_softc_lock);
if (tp->tun_flags & TUN_RWAIT) {
tp->tun_flags &= ~TUN_RWAIT;
wakeup((caddr_t)tp);
}
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
fownsignal(tp->tun_pgid, SIGIO, POLL_HUP, 0, NULL);
selwakeup(&tp->tun_rsel);
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
if_detach(ifp);
free(tp, M_DEVBUF);
}
static struct tun_softc *
tun_find_unit(dev)
dev_t dev;
{
struct tun_softc *tp;
int unit = minor(dev);
simple_lock(&tun_softc_lock);
LIST_FOREACH(tp, &tun_softc_list, tun_list)
if (unit == tp->tun_unit)
break;
if (tp)
simple_lock(&tp->tun_lock);
simple_unlock(&tun_softc_lock);
return (tp);
}
/*
* tunnel open - must be superuser & the device must be
* configured in
*/
int
tunopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
struct ifnet *ifp;
struct tun_softc *tp;
int error;
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
if (NTUN < 1)
return (ENXIO);
tp = tun_find_unit(dev);
if (!tp) {
(void)tun_clone_create(&tun_cloner, minor(dev));
tp = tun_find_unit(dev);
}
if (!tp)
return (ENXIO);
if (tp->tun_flags & TUN_OPEN) {
simple_unlock(&tp->tun_lock);
return (EBUSY);
}
ifp = &tp->tun_if;
tp->tun_flags |= TUN_OPEN;
TUNDEBUG("%s: open\n", ifp->if_xname);
simple_unlock(&tp->tun_lock);
return (0);
}
/*
* tunclose - close the device - mark i/f down & delete
* routing info
*/
int
tunclose(dev, flag, mode, p)
dev_t dev;
int flag;
int mode;
struct proc *p;
{
int s;
struct tun_softc *tp;
struct ifnet *ifp;
tp = tun_find_unit(dev);
/* interface was "destroyed" before the close */
if (tp == NULL)
return (0);
ifp = &tp->tun_if;
tp->tun_flags &= ~TUN_OPEN;
/*
* junk all pending output
*/
s = splnet();
IFQ_PURGE(&ifp->if_snd);
splx(s);
if (ifp->if_flags & IFF_UP) {
s = splnet();
if_down(ifp);
if (ifp->if_flags & IFF_RUNNING) {
/* find internet addresses and delete routes */
struct ifaddr *ifa;
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
#ifdef INET
if (ifa->ifa_addr->sa_family == AF_INET) {
rtinit(ifa, (int)RTM_DELETE,
tp->tun_flags & TUN_DSTADDR
? RTF_HOST
: 0);
}
#endif
}
}
splx(s);
}
tp->tun_pgid = 0;
selnotify(&tp->tun_rsel, 0);
TUNDEBUG ("%s: closed\n", ifp->if_xname);
simple_unlock(&tp->tun_lock);
return (0);
}
static void
tuninit(tp)
struct tun_softc *tp;
{
struct ifnet *ifp = &tp->tun_if;
struct ifaddr *ifa;
TUNDEBUG("%s: tuninit\n", ifp->if_xname);
ifp->if_flags |= IFF_UP | IFF_RUNNING;
tp->tun_flags &= ~(TUN_IASET|TUN_DSTADDR);
TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
#ifdef INET
if (ifa->ifa_addr->sa_family == AF_INET) {
struct sockaddr_in *sin;
sin = satosin(ifa->ifa_addr);
if (sin && sin->sin_addr.s_addr)
tp->tun_flags |= TUN_IASET;
if (ifp->if_flags & IFF_POINTOPOINT) {
sin = satosin(ifa->ifa_dstaddr);
if (sin && sin->sin_addr.s_addr)
tp->tun_flags |= TUN_DSTADDR;
}
}
#endif
}
return;
}
/*
* Process an ioctl request.
*/
int
tun_ioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
int error = 0, s;
struct tun_softc *tp = (struct tun_softc *)(ifp->if_softc);
simple_lock(&tp->tun_lock);
s = splnet();
switch (cmd) {
case SIOCSIFADDR:
tuninit((struct tun_softc *)(ifp->if_softc));
TUNDEBUG("%s: address set\n", ifp->if_xname);
break;
case SIOCSIFDSTADDR:
tuninit((struct tun_softc *)(ifp->if_softc));
TUNDEBUG("%s: destination address set\n", ifp->if_xname);
break;
case SIOCSIFBRDADDR:
TUNDEBUG("%s: broadcast address set\n", ifp->if_xname);
break;
case SIOCSIFMTU: {
struct ifreq *ifr = (struct ifreq *) data;
if (ifr->ifr_mtu > TUNMTU || ifr->ifr_mtu < 576) {
error = EINVAL;
break;
}
TUNDEBUG("%s: interface mtu set\n", ifp->if_xname);
ifp->if_mtu = ifr->ifr_mtu;
break;
}
case SIOCADDMULTI:
case SIOCDELMULTI: {
struct ifreq *ifr = (struct ifreq *) data;
if (ifr == 0) {
error = EAFNOSUPPORT; /* XXX */
break;
}
switch (ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
break;
#endif
default:
error = EAFNOSUPPORT;
break;
}
break;
}
case SIOCSIFFLAGS:
break;
default:
error = EINVAL;
}
splx(s);
simple_unlock(&tp->tun_lock);
return (error);
}
/*
* tun_output - queue packets from higher level ready to put out.
*/
int
tun_output(ifp, m0, dst, rt)
struct ifnet *ifp;
struct mbuf *m0;
struct sockaddr *dst;
struct rtentry *rt;
{
struct tun_softc *tp = ifp->if_softc;
#ifdef INET
int s;
int error;
#endif
int mlen;
ALTQ_DECL(struct altq_pktattr pktattr;)
simple_lock(&tp->tun_lock);
TUNDEBUG ("%s: tun_output\n", ifp->if_xname);
if ((tp->tun_flags & TUN_READY) != TUN_READY) {
TUNDEBUG ("%s: not ready 0%o\n", ifp->if_xname,
tp->tun_flags);
m_freem (m0);
simple_unlock(&tp->tun_lock);
return (EHOSTDOWN);
}
/*
* if the queueing discipline needs packet classification,
* do it before prepending link headers.
*/
IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr);
#if NBPFILTER > 0
if (ifp->if_bpf) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer to it).
*/
struct mbuf m;
u_int32_t af = dst->sa_family;
m.m_flags = 0;
m.m_next = m0;
m.m_len = sizeof(af);
m.m_data = (char *)&af;
bpf_mtap(ifp->if_bpf, &m);
}
#endif
switch(dst->sa_family) {
#ifdef INET
case AF_INET:
if (tp->tun_flags & TUN_PREPADDR) {
/* Simple link-layer header */
M_PREPEND(m0, dst->sa_len, M_DONTWAIT);
if (m0 == NULL) {
IF_DROP(&ifp->if_snd);
simple_unlock(&tp->tun_lock);
return (ENOBUFS);
}
bcopy(dst, mtod(m0, char *), dst->sa_len);
}
/* FALLTHROUGH */
case AF_UNSPEC:
s = splnet();
IFQ_ENQUEUE(&ifp->if_snd, m0, &pktattr, error);
if (error) {
splx(s);
ifp->if_collisions++;
return (error);
}
mlen = m0->m_pkthdr.len;
splx(s);
ifp->if_opackets++;
ifp->if_obytes += mlen;
break;
#endif
default:
m_freem(m0);
simple_unlock(&tp->tun_lock);
return (EAFNOSUPPORT);
}
if (tp->tun_flags & TUN_RWAIT) {
tp->tun_flags &= ~TUN_RWAIT;
wakeup((caddr_t)tp);
}
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
fownsignal(tp->tun_pgid, SIGIO, POLL_IN, POLLIN|POLLRDNORM,
NULL);
selnotify(&tp->tun_rsel, 0);
simple_unlock(&tp->tun_lock);
return (0);
}
/*
* the cdevsw interface is now pretty minimal.
*/
int
tunioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
int s;
struct tun_softc *tp;
int error=0;
tp = tun_find_unit(dev);
/* interface was "destroyed" already */
if (tp == NULL)
return (ENXIO);
switch (cmd) {
case TUNSDEBUG:
tundebug = *(int *)data;
break;
case TUNGDEBUG:
*(int *)data = tundebug;
break;
case TUNSIFMODE:
switch (*(int *)data & (IFF_POINTOPOINT|IFF_BROADCAST)) {
case IFF_POINTOPOINT:
case IFF_BROADCAST:
s = splnet();
if (tp->tun_if.if_flags & IFF_UP) {
splx(s);
simple_unlock(&tp->tun_lock);
return (EBUSY);
}
tp->tun_if.if_flags &=
~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST);
tp->tun_if.if_flags |= *(int *)data;
splx(s);
break;
default:
simple_unlock(&tp->tun_lock);
return (EINVAL);
}
break;
case TUNSLMODE:
if (*(int *)data)
tp->tun_flags |= TUN_PREPADDR;
else
tp->tun_flags &= ~TUN_PREPADDR;
break;
case FIONBIO:
if (*(int *)data)
tp->tun_flags |= TUN_NBIO;
else
tp->tun_flags &= ~TUN_NBIO;
break;
case FIOASYNC:
if (*(int *)data)
tp->tun_flags |= TUN_ASYNC;
else
tp->tun_flags &= ~TUN_ASYNC;
break;
case FIONREAD:
s = splnet();
if (tp->tun_if.if_snd.ifq_head)
*(int *)data = tp->tun_if.if_snd.ifq_head->m_pkthdr.len;
else
*(int *)data = 0;
splx(s);
break;
case TIOCSPGRP:
case FIOSETOWN:
error = fsetown(p, &tp->tun_pgid, cmd, data);
break;
case TIOCGPGRP:
case FIOGETOWN:
error = fgetown(p, tp->tun_pgid, cmd, data);
break;
default:
simple_unlock(&tp->tun_lock);
return (ENOTTY);
}
simple_unlock(&tp->tun_lock);
return (error);
}
/*
* The cdevsw read interface - reads a packet at a time, or at
* least as much of a packet as can be read.
*/
int
tunread(dev, uio, ioflag)
dev_t dev;
struct uio *uio;
int ioflag;
{
struct tun_softc *tp;
struct ifnet *ifp;
struct mbuf *m, *m0;
int error=0, len, s, index;
tp = tun_find_unit(dev);
/* interface was "destroyed" already */
if (tp == NULL)
return (ENXIO);
index = tp->tun_if.if_index;
ifp = &tp->tun_if;
TUNDEBUG ("%s: read\n", ifp->if_xname);
if ((tp->tun_flags & TUN_READY) != TUN_READY) {
TUNDEBUG ("%s: not ready 0%o\n", ifp->if_xname, tp->tun_flags);
simple_unlock(&tp->tun_lock);
return EHOSTDOWN;
}
tp->tun_flags &= ~TUN_RWAIT;
s = splnet();
do {
IFQ_DEQUEUE(&ifp->if_snd, m0);
if (m0 == 0) {
if (tp->tun_flags & TUN_NBIO) {
splx(s);
simple_unlock(&tp->tun_lock);
return (EWOULDBLOCK);
}
tp->tun_flags |= TUN_RWAIT;
simple_unlock(&tp->tun_lock);
if (tsleep((caddr_t)tp, PZERO|PCATCH, "tunread", 0)) {
splx(s);
return (EINTR);
} else {
/*
* Maybe the interface was destroyed while
* we were sleeping, so let's ensure that
* we're looking at the same (valid) tun
* interface before looping.
*/
tp = tun_find_unit(dev);
if (tp == NULL ||
tp->tun_if.if_index != index) {
splx(s);
if (tp)
simple_unlock(&tp->tun_lock);
return (ENXIO);
}
}
}
} while (m0 == 0);
splx(s);
while (m0 && uio->uio_resid > 0 && error == 0) {
len = min(uio->uio_resid, m0->m_len);
if (len != 0)
error = uiomove(mtod(m0, caddr_t), len, uio);
MFREE(m0, m);
m0 = m;
}
if (m0) {
TUNDEBUG("Dropping mbuf\n");
m_freem(m0);
}
if (error)
ifp->if_ierrors++;
simple_unlock(&tp->tun_lock);
return (error);
}
/*
* the cdevsw write interface - an atomic write is a packet - or else!
*/
int
tunwrite(dev, uio, ioflag)
dev_t dev;
struct uio *uio;
int ioflag;
{
struct tun_softc *tp;
struct ifnet *ifp;
struct mbuf *top, **mp, *m;
struct ifqueue *ifq;
struct sockaddr dst;
int isr, error=0, s, tlen, mlen;
tp = tun_find_unit(dev);
/* interface was "destroyed" already */
if (tp == NULL)
return (ENXIO);
ifp = &tp->tun_if;
TUNDEBUG("%s: tunwrite\n", ifp->if_xname);
if (tp->tun_flags & TUN_PREPADDR) {
if (uio->uio_resid < sizeof(dst)) {
simple_unlock(&tp->tun_lock);
return (EIO);
}
error = uiomove((caddr_t)&dst, sizeof(dst), uio);
if (dst.sa_len > sizeof(dst)) {
/* Duh.. */
char discard;
int n = dst.sa_len - sizeof(dst);
while (n--)
if ((error = uiomove(&discard, 1, uio)) != 0) {
simple_unlock(&tp->tun_lock);
return (error);
}
}
} else {
#ifdef INET
dst.sa_family = AF_INET;
#endif
}
if (uio->uio_resid > TUNMTU) {
TUNDEBUG("%s: len=%lu!\n", ifp->if_xname,
(unsigned long)uio->uio_resid);
simple_unlock(&tp->tun_lock);
return (EIO);
}
switch (dst.sa_family) {
#ifdef INET
case AF_INET:
ifq = &ipintrq;
isr = NETISR_IP;
break;
#endif
default:
simple_unlock(&tp->tun_lock);
return (EAFNOSUPPORT);
}
tlen = uio->uio_resid;
/* get a header mbuf */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
simple_unlock(&tp->tun_lock);
return (ENOBUFS);
}
mlen = MHLEN;
top = NULL;
mp = &top;
while (error == 0 && uio->uio_resid > 0) {
m->m_len = min(mlen, uio->uio_resid);
error = uiomove(mtod(m, caddr_t), m->m_len, uio);
*mp = m;
mp = &m->m_next;
if (error == 0 && uio->uio_resid > 0) {
MGET(m, M_DONTWAIT, MT_DATA);
if (m == NULL) {
error = ENOBUFS;
break;
}
mlen = MLEN;
}
}
if (error) {
if (top != NULL)
m_freem (top);
ifp->if_ierrors++;
simple_unlock(&tp->tun_lock);
return (error);
}
top->m_pkthdr.len = tlen;
top->m_pkthdr.rcvif = ifp;
#if NBPFILTER > 0
if (ifp->if_bpf) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer to it).
*/
struct mbuf m;
u_int32_t af = AF_INET;
m.m_flags = 0;
m.m_next = top;
m.m_len = sizeof(af);
m.m_data = (char *)&af;
bpf_mtap(ifp->if_bpf, &m);
}
#endif
s = splnet();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
splx(s);
ifp->if_collisions++;
m_freem(top);
simple_unlock(&tp->tun_lock);
return (ENOBUFS);
}
IF_ENQUEUE(ifq, top);
splx(s);
ifp->if_ipackets++;
ifp->if_ibytes += tlen;
schednetisr(isr);
simple_unlock(&tp->tun_lock);
return (error);
}
#ifdef ALTQ
/*
* Start packet transmission on the interface.
* when the interface queue is rate-limited by ALTQ or TBR,
* if_start is needed to drain packets from the queue in order
* to notify readers when outgoing packets become ready.
*/
static void
tunstart(ifp)
struct ifnet *ifp;
{
struct tun_softc *tp = ifp->if_softc;
struct mbuf *m;
if (!ALTQ_IS_ENABLED(&ifp->if_snd) && !TBR_IS_ENABLED(&ifp->if_snd))
return;
IFQ_POLL(&ifp->if_snd, m);
if (m != NULL) {
if (tp->tun_flags & TUN_RWAIT) {
tp->tun_flags &= ~TUN_RWAIT;
wakeup((caddr_t)tp);
}
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
fownsignal(tp->tun_pgid, SIGIO, POLL_OUT,
POLLOUT|POLLWRNORM, NULL);
selwakeup(&tp->tun_rsel);
}
}
#endif /* ALTQ */
/*
* tunpoll - the poll interface, this is only useful on reads
* really. The write detect always returns true, write never blocks
* anyway, it either accepts the packet or drops it.
*/
int
tunpoll(dev, events, p)
dev_t dev;
int events;
struct proc *p;
{
struct tun_softc *tp;
struct ifnet *ifp;
int s, revents = 0;
tp = tun_find_unit(dev);
/* interface was "destroyed" already */
if (tp == NULL)
return (0);
ifp = &tp->tun_if;
s = splnet();
TUNDEBUG("%s: tunpoll\n", ifp->if_xname);
if (events & (POLLIN | POLLRDNORM)) {
if (IFQ_IS_EMPTY(&ifp->if_snd) == 0) {
TUNDEBUG("%s: tunpoll q=%d\n", ifp->if_xname,
ifp->if_snd.ifq_len);
revents |= events & (POLLIN | POLLRDNORM);
} else {
TUNDEBUG("%s: tunpoll waiting\n", ifp->if_xname);
selrecord(p, &tp->tun_rsel);
}
}
if (events & (POLLOUT | POLLWRNORM))
revents |= events & (POLLOUT | POLLWRNORM);
splx(s);
simple_unlock(&tp->tun_lock);
return (revents);
}
static void
filt_tunrdetach(struct knote *kn)
{
struct tun_softc *tp = kn->kn_hook;
int s;
s = splnet();
SLIST_REMOVE(&tp->tun_rsel.sel_klist, kn, knote, kn_selnext);
splx(s);
}
static int
filt_tunread(struct knote *kn, long hint)
{
struct tun_softc *tp = kn->kn_hook;
struct ifnet *ifp = &tp->tun_if;
struct mbuf *m;
int s;
s = splnet();
IF_POLL(&ifp->if_snd, m);
if (m == NULL) {
splx(s);
return (0);
}
for (kn->kn_data = 0; m != NULL; m = m->m_next)
kn->kn_data += m->m_len;
splx(s);
return (1);
}
static const struct filterops tunread_filtops =
{ 1, NULL, filt_tunrdetach, filt_tunread };
static const struct filterops tun_seltrue_filtops =
{ 1, NULL, filt_tunrdetach, filt_seltrue };
int
tunkqfilter(dev_t dev, struct knote *kn)
{
struct tun_softc *tp = tun_find_unit(dev);
struct klist *klist;
int s;
switch (kn->kn_filter) {
case EVFILT_READ:
klist = &tp->tun_rsel.sel_klist;
kn->kn_fop = &tunread_filtops;
break;
case EVFILT_WRITE:
klist = &tp->tun_rsel.sel_klist;
kn->kn_fop = &tun_seltrue_filtops;
break;
default:
return (1);
}
kn->kn_hook = tp;
s = splnet();
SLIST_INSERT_HEAD(klist, kn, kn_selnext);
splx(s);
return (0);
}
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