File: [local] / src / sys / net / if_tun.c (download)
Revision 1.58, Tue Mar 2 23:09:29 2004 UTC (20 years, 3 months ago) by markus
Branch: MAIN
CVS Tags: OPENBSD_3_5_BASE, OPENBSD_3_5 Changes since 1.57: +2 -2 lines
don't leak mbuf if uiomove fails; from netbsd;
ok henning, cedric, claudio, deraadt
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/* $OpenBSD: if_tun.c,v 1.58 2004/03/02 23:09:29 markus Exp $ */
/* $NetBSD: if_tun.c,v 1.24 1996/05/07 02:40:48 thorpej Exp $ */
/*
* Copyright (c) 1988, Julian Onions <Julian.Onions@nexor.co.uk>
* Nottingham University 1987.
* 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.
*/
/*
* 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/select mode of
* operation though.
*/
/* #define TUN_DEBUG 9 */
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/mbuf.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/file.h>
#include <sys/time.h>
#include <sys/device.h>
#include <sys/vnode.h>
#include <sys/signalvar.h>
#include <sys/poll.h>
#include <sys/conf.h>
#include <machine/cpu.h>
#include <net/if.h>
#include <net/if_types.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_ether.h> */
#endif
#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif
#ifdef NETATALK
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#endif
#ifdef ISO
#include <netiso/iso.h>
#include <netiso/iso_var.h>
#endif
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <net/if_tun.h>
struct tun_softc {
struct ifnet tun_if; /* the interface */
u_short tun_flags; /* misc flags */
pid_t tun_pgid; /* the process group - if any */
uid_t tun_siguid; /* uid for process that set tun_pgid */
uid_t tun_sigeuid; /* euid for process that set tun_pgid */
struct selinfo tun_rsel; /* read select */
struct selinfo tun_wsel; /* write select (not used) */
int tun_unit;
LIST_ENTRY(tun_softc) tun_list; /* all tunnel interfaces */
};
#ifdef TUN_DEBUG
int tundebug = TUN_DEBUG;
#define TUNDEBUG(a) (tundebug? printf a : 0)
#else
#define TUNDEBUG(a) /* (tundebug? printf a : 0) */
#endif
extern int ifqmaxlen;
void tunattach(int);
int tunopen(dev_t, int, int, struct proc *);
int tunclose(dev_t, int, int, struct proc *);
int tun_ioctl(struct ifnet *, u_long, caddr_t);
int tun_output(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *rt);
int tunioctl(dev_t, u_long, caddr_t, int, struct proc *);
int tunread(dev_t, struct uio *, int);
int tunwrite(dev_t, struct uio *, int);
int tunpoll(dev_t, int, struct proc *);
int tunkqfilter(dev_t, struct knote *);
int tun_clone_create(struct if_clone *, int);
int tun_clone_destroy(struct ifnet *);
struct tun_softc *tun_lookup(int);
void tun_wakeup(struct tun_softc *);
static int tuninit(struct tun_softc *);
#ifdef ALTQ
static void tunstart(struct ifnet *);
#endif
int filt_tunread(struct knote *, long);
int filt_tunwrite(struct knote *, long);
void filt_tunrdetach(struct knote *);
void filt_tunwdetach(struct knote *);
struct filterops tunread_filtops =
{ 1, NULL, filt_tunrdetach, filt_tunread};
struct filterops tunwrite_filtops =
{ 1, NULL, filt_tunwdetach, filt_tunwrite};
LIST_HEAD(, tun_softc) tun_softc_list;
struct if_clone tun_cloner =
IF_CLONE_INITIALIZER("tun", tun_clone_create, tun_clone_destroy);
void
tunattach(n)
int n;
{
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 *tp;
struct ifnet *ifp;
int s;
tp = malloc(sizeof(*tp), M_DEVBUF, M_NOWAIT);
if (!tp)
return (ENOMEM);
bzero(tp, sizeof(*tp));
tp->tun_unit = unit;
tp->tun_flags = TUN_INITED;
ifp = &tp->tun_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "%s%d", ifc->ifc_name,
unit);
ifp->if_softc = tp;
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_type = IFT_PROPVIRTUAL;
IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
IFQ_SET_READY(&ifp->if_snd);
ifp->if_hdrlen = sizeof(u_int32_t);
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;
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, sizeof(u_int32_t));
#endif
s = splimp();
LIST_INSERT_HEAD(&tun_softc_list, tp, tun_list);
splx(s);
return (0);
}
int
tun_clone_destroy(ifp)
struct ifnet *ifp;
{
struct tun_softc *tp = ifp->if_softc;
int s;
s = splhigh();
klist_invalidate(&tp->tun_rsel.si_note);
klist_invalidate(&tp->tun_wsel.si_note);
splx(s);
s = splimp();
LIST_REMOVE(tp, tun_list);
splx(s);
tun_wakeup(tp);
#if NBPFILTER > 0
bpfdetach(ifp);
#endif
if_detach(ifp);
free(tp, M_DEVBUF);
return (0);
}
struct tun_softc *
tun_lookup(unit)
int unit;
{
struct tun_softc *tp;
LIST_FOREACH(tp, &tun_softc_list, tun_list)
if (tp->tun_unit == unit)
return (tp);
return (NULL);
}
/*
* 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 tun_softc *tp;
struct ifnet *ifp;
int error;
if ((error = suser(p, 0)) != 0)
return (error);
if ((tp = tun_lookup(minor(dev))) == NULL) {
/* create on demand */
(void) tun_clone_create(&tun_cloner, minor(dev));
if ((tp = tun_lookup(minor(dev))) == NULL)
return (ENXIO);
}
if (tp->tun_flags & TUN_OPEN)
return EBUSY;
ifp = &tp->tun_if;
tp->tun_flags |= TUN_OPEN;
TUNDEBUG(("%s: open\n", ifp->if_xname));
return (0);
}
/*
* tunclose - close the device; if closing the real device, flush pending
* output and (unless set STAYUP) bring down the interface.
*/
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;
if ((tp = tun_lookup(minor(dev))) == NULL)
return (ENXIO);
ifp = &tp->tun_if;
tp->tun_flags &= ~TUN_OPEN;
/*
* junk all pending output
*/
s = splimp();
IFQ_PURGE(&ifp->if_snd);
splx(s);
if ((ifp->if_flags & IFF_UP) && !(tp->tun_flags & TUN_STAYUP)) {
s = splimp();
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;
selwakeup(&tp->tun_rsel);
KNOTE(&tp->tun_rsel.si_note, 0);
TUNDEBUG(("%s: closed\n", ifp->if_xname));
return (0);
}
static int
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|TUN_BRDADDR);
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;
} else
tp->tun_flags &= ~TUN_DSTADDR;
if (ifp->if_flags & IFF_BROADCAST) {
sin = satosin(ifa->ifa_broadaddr);
if (sin && sin->sin_addr.s_addr)
tp->tun_flags |= TUN_BRDADDR;
} else
tp->tun_flags &= ~TUN_BRDADDR;
}
#endif
#ifdef INET6
if (ifa->ifa_addr->sa_family == AF_INET6) {
struct sockaddr_in6 *sin;
sin = (struct sockaddr_in6 *)ifa->ifa_addr;
if (!IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr))
tp->tun_flags |= TUN_IASET;
if (ifp->if_flags & IFF_POINTOPOINT) {
sin = (struct sockaddr_in6 *)ifa->ifa_dstaddr;
if (sin &&
!IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr))
tp->tun_flags |= TUN_DSTADDR;
} else
tp->tun_flags &= ~TUN_DSTADDR;
}
#endif /* INET6 */
}
return 0;
}
/*
* Process an ioctl request.
*/
int
tun_ioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
int error = 0, s;
s = splimp();
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:
tuninit((struct tun_softc *)(ifp->if_softc));
TUNDEBUG(("%s: broadcast address set\n", ifp->if_xname));
break;
case SIOCSIFMTU:
ifp->if_mtu = ((struct ifreq *)data)->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
#ifdef INET6
case AF_INET6:
break;
#endif
default:
error = EAFNOSUPPORT;
break;
}
break;
}
case SIOCSIFFLAGS:
break;
default:
error = EINVAL;
}
splx(s);
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;
int s, len, error;
u_int32_t *af;
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);
return EHOSTDOWN;
}
M_PREPEND(m0, sizeof(*af), M_DONTWAIT);
af = mtod(m0, u_int32_t *);
*af = htonl(dst->sa_family);
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m0);
#endif
len = m0->m_pkthdr.len + sizeof(*af);
s = splimp();
IFQ_ENQUEUE(&ifp->if_snd, m0, NULL, error);
if (error) {
splx(s);
ifp->if_collisions++;
return (error);
}
splx(s);
ifp->if_opackets++;
ifp->if_obytes += len;
tun_wakeup(tp);
return 0;
}
void
tun_wakeup(tp)
struct tun_softc *tp;
{
if (tp->tun_flags & TUN_RWAIT) {
tp->tun_flags &= ~TUN_RWAIT;
wakeup((caddr_t)tp);
}
if (tp->tun_flags & TUN_ASYNC && tp->tun_pgid)
csignal(tp->tun_pgid, SIGIO,
tp->tun_siguid, tp->tun_sigeuid);
selwakeup(&tp->tun_rsel);
KNOTE(&tp->tun_rsel.si_note, 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;
struct tuninfo *tunp;
struct mbuf *m;
if ((tp = tun_lookup(minor(dev))) == NULL)
return (ENXIO);
s = splimp();
switch (cmd) {
case TUNSIFINFO:
tunp = (struct tuninfo *)data;
tp->tun_if.if_mtu = tunp->mtu;
tp->tun_if.if_type = tunp->type;
tp->tun_if.if_flags = tunp->flags;
tp->tun_if.if_baudrate = tunp->baudrate;
break;
case TUNGIFINFO:
tunp = (struct tuninfo *)data;
tunp->mtu = tp->tun_if.if_mtu;
tunp->type = tp->tun_if.if_type;
tunp->flags = tp->tun_if.if_flags;
tunp->baudrate = tp->tun_if.if_baudrate;
break;
#ifdef TUN_DEBUG
case TUNSDEBUG:
tundebug = *(int *)data;
break;
case TUNGDEBUG:
*(int *)data = tundebug;
break;
#endif
case TUNSIFMODE:
switch (*(int *)data & (IFF_POINTOPOINT|IFF_BROADCAST)) {
case IFF_POINTOPOINT:
case IFF_BROADCAST:
if (tp->tun_if.if_flags & IFF_UP) {
splx(s);
return (EBUSY);
}
tp->tun_if.if_flags &=
~(IFF_BROADCAST|IFF_POINTOPOINT|IFF_MULTICAST);
tp->tun_if.if_flags |= *(int *)data;
break;
default:
splx(s);
return (EINVAL);
}
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:
IFQ_POLL(&tp->tun_if.if_snd, m);
if (m != NULL)
*(int *)data = m->m_pkthdr.len;
else
*(int *)data = 0;
break;
case TIOCSPGRP:
tp->tun_pgid = *(int *)data;
tp->tun_siguid = p->p_cred->p_ruid;
tp->tun_sigeuid = p->p_ucred->cr_uid;
break;
case TIOCGPGRP:
*(int *)data = tp->tun_pgid;
break;
default:
splx(s);
return (ENOTTY);
}
splx(s);
return (0);
}
/*
* 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;
if ((tp = tun_lookup(minor(dev))) == NULL)
return (ENXIO);
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));
return EHOSTDOWN;
}
tp->tun_flags &= ~TUN_RWAIT;
s = splimp();
do {
while ((tp->tun_flags & TUN_READY) != TUN_READY)
if ((error = tsleep((caddr_t)tp,
(PZERO+1)|PCATCH, "tunread", 0)) != 0) {
splx(s);
return (error);
}
IFQ_DEQUEUE(&ifp->if_snd, m0);
if (m0 == 0) {
if (tp->tun_flags & TUN_NBIO && ioflag & IO_NDELAY) {
splx(s);
return EWOULDBLOCK;
}
tp->tun_flags |= TUN_RWAIT;
if ((error = tsleep((caddr_t)tp,
(PZERO + 1)|PCATCH, "tunread", 0)) != 0) {
splx(s);
return (error);
}
}
} 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++;
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 ifqueue *ifq;
u_int32_t *th;
struct mbuf *top, **mp, *m;
int isr;
int error=0, s, tlen, mlen;
if ((tp = tun_lookup(minor(dev))) == NULL)
return (ENXIO);
ifp = &tp->tun_if;
TUNDEBUG(("%s: tunwrite\n", ifp->if_xname));
if (uio->uio_resid == 0 || uio->uio_resid > TUNMRU) {
TUNDEBUG(("%s: len=%d!\n", ifp->if_xname, uio->uio_resid));
return EMSGSIZE;
}
tlen = uio->uio_resid;
/* get a header mbuf */
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return ENOBUFS;
mlen = MHLEN;
top = 0;
mp = ⊤
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 == 0) {
error = ENOBUFS;
break;
}
mlen = MLEN;
}
}
if (error) {
if (top)
m_freem (top);
ifp->if_ierrors++;
return error;
}
top->m_pkthdr.len = tlen;
top->m_pkthdr.rcvif = ifp;
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, top);
#endif
th = mtod(top, u_int32_t *);
/* strip the tunnel header */
top->m_data += sizeof(*th);
top->m_len -= sizeof(*th);
top->m_pkthdr.len -= sizeof(*th);
switch (ntohl(*th)) {
#ifdef INET
case AF_INET:
ifq = &ipintrq;
isr = NETISR_IP;
break;
#endif
#ifdef INET6
case AF_INET6:
ifq = &ip6intrq;
isr = NETISR_IPV6;
break;
#endif
#ifdef NS
case AF_NS:
ifq = &nsintrq;
isr = NETISR_NS;
break;
#endif
#ifdef IPX
case AF_IPX:
ifq = &ipxintrq;
isr = NETISR_IPX;
break;
#endif
#ifdef NETATALK
case AF_APPLETALK:
ifq = &atintrq2;
isr = NETISR_ATALK;
break;
#endif
#ifdef ISO
case AF_ISO:
ifq = &clnlintrq;
isr = NETISR_ISO;
break;
#endif
default:
m_freem(top);
return EAFNOSUPPORT;
}
s = splimp();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
splx(s);
ifp->if_collisions++;
m_freem(top);
return ENOBUFS;
}
IF_ENQUEUE(ifq, top);
schednetisr(isr);
ifp->if_ipackets++;
ifp->if_ibytes += top->m_pkthdr.len;
splx(s);
return error;
}
/*
* tunselect - the select 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;
{
int revents, s;
struct tun_softc *tp;
struct ifnet *ifp;
struct mbuf *m;
if ((tp = tun_lookup(minor(dev))) == NULL)
return (ENXIO);
ifp = &tp->tun_if;
revents = 0;
s = splimp();
TUNDEBUG(("%s: tunpoll\n", ifp->if_xname));
if (events & (POLLIN | POLLRDNORM)) {
IFQ_POLL(&ifp->if_snd, m);
if (m != NULL) {
TUNDEBUG(("%s: tunselect 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);
return (revents);
}
/*
* kqueue(2) support.
*
* The tun driver uses an array of tun_softc's based on the minor number
* of the device. kn->kn_hook gets set to the specific tun_softc.
*
* filt_tunread() sets kn->kn_data to the iface qsize
* filt_tunwrite() sets kn->kn_data to the MTU size
*/
int
tunkqfilter(dev_t dev,struct knote *kn)
{
int s;
struct klist *klist;
struct tun_softc *tp;
struct ifnet *ifp;
if ((tp = tun_lookup(minor(dev))) == NULL)
return (ENXIO);
ifp = &tp->tun_if;
s = splimp();
TUNDEBUG(("%s: tunselect\n", ifp->if_xname));
splx(s);
switch (kn->kn_filter) {
case EVFILT_READ:
klist = &tp->tun_rsel.si_note;
kn->kn_fop = &tunread_filtops;
break;
case EVFILT_WRITE:
klist = &tp->tun_wsel.si_note;
kn->kn_fop = &tunwrite_filtops;
break;
default:
return EPERM; /* 1 */
}
kn->kn_hook = (caddr_t)tp;
s = splhigh();
SLIST_INSERT_HEAD(klist, kn, kn_selnext);
splx(s);
return 0;
}
void
filt_tunrdetach(struct knote *kn)
{
int s;
struct tun_softc *tp = (struct tun_softc *)kn->kn_hook;
s = splhigh();
if (!(kn->kn_status & KN_DETACHED))
SLIST_REMOVE(&tp->tun_rsel.si_note, kn, knote, kn_selnext);
splx(s);
}
int
filt_tunread(struct knote *kn, long hint)
{
int s;
struct tun_softc *tp;
struct ifnet *ifp;
struct mbuf *m;
if (kn->kn_status & KN_DETACHED) {
kn->kn_data = 0;
return 1;
}
tp = (struct tun_softc *)kn->kn_hook;
ifp = &tp->tun_if;
s = splnet();
IFQ_POLL(&ifp->if_snd, m);
if (m != NULL) {
splx(s);
kn->kn_data = ifp->if_snd.ifq_len;
TUNDEBUG(("%s: tunkqread q=%d\n", ifp->if_xname,
ifp->if_snd.ifq_len));
return 1;
}
splx(s);
TUNDEBUG(("%s: tunkqread waiting\n", ifp->if_xname));
return 0;
}
void
filt_tunwdetach(struct knote *kn)
{
int s;
struct tun_softc *tp = (struct tun_softc *)kn->kn_hook;
s = splhigh();
if (!(kn->kn_status & KN_DETACHED))
SLIST_REMOVE(&tp->tun_wsel.si_note, kn, knote, kn_selnext);
splx(s);
}
int
filt_tunwrite(struct knote *kn, long hint)
{
struct tun_softc *tp;
struct ifnet *ifp;
if (kn->kn_status & KN_DETACHED) {
kn->kn_data = 0;
return 1;
}
tp = (struct tun_softc *)kn->kn_hook;
ifp = &tp->tun_if;
kn->kn_data = ifp->if_mtu;
return 1;
}
#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)
tun_wakeup(tp);
}
#endif