#include "tun.h"
#if NTUN > 0
#include "opt_devfs.h"
#include "opt_inet.h"
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/filio.h>
#include <sys/sockio.h>
#include <sys/ttycom.h>
#include <sys/poll.h>
#include <sys/signalvar.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#if DEVFS
#include <sys/devfsext.h>
#endif
#include <sys/conf.h>
#include <sys/uio.h>
#include <sys/vnode.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#if INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#endif
#if INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_ifattach.h>
#endif
#if NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <net/if_tunvar.h>
#include <net/if_tun.h>
static void tunattach __P((void *));
PSEUDO_SET(tunattach, if_tun);
#define TUNDEBUG if (tundebug) printf
static int tundebug = 0;
SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, "");
static struct tun_softc tunctl[NTUN];
static int tunoutput __P((struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *rt));
static int tunifioctl __P((struct ifnet *, u_long, caddr_t));
static int tuninit __P((int, int, u_char));
static d_open_t tunopen;
static d_close_t tunclose;
static d_read_t tunread;
static d_write_t tunwrite;
static d_ioctl_t tunioctl;
static d_poll_t tunpoll;
#define CDEV_MAJOR 52
static struct cdevsw tun_cdevsw = {
tunopen, tunclose, tunread, tunwrite,
tunioctl, nullstop, noreset, nodevtotty,
tunpoll, nommap, nostrategy, "tun", NULL, -1
};
static int tun_devsw_installed;
#if DEVFS
static void *tun_devfs_token[NTUN];
#endif
#define minor_val(n) ((((n) & ~0xff) << 8) | ((n) & 0xff))
#define dev_val(n) (((n) >> 8) | ((n) & 0xff))
static void
tunattach(dummy)
void *dummy;
{
register int i;
struct ifnet *ifp;
dev_t dev;
if ( tun_devsw_installed )
return;
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev, &tun_cdevsw, NULL);
tun_devsw_installed = 1;
for ( i = 0; i < NTUN; i++ ) {
#if DEVFS
tun_devfs_token[i] = devfs_add_devswf(&tun_cdevsw, minor_val(i),
DV_CHR, UID_UUCP,
GID_DIALER, 0600,
"tun%d", i);
#endif
tunctl[i].tun_flags = TUN_INITED;
ifp = &tunctl[i].tun_if;
ifp->if_unit = i;
ifp->if_name = "tun";
ifp->if_family = APPLE_IF_FAM_TUN;
ifp->if_mtu = TUNMTU;
ifp->if_ioctl = tunifioctl;
ifp->if_output = tunoutput;
ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
ifp->if_type = IFT_PPP;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
if_attach(ifp);
#if NBPFILTER > 0
bpfattach(ifp, DLT_NULL, sizeof(u_int));
#endif
}
}
static int
tunopen(dev, flag, mode, p)
dev_t dev;
int flag, mode;
struct proc *p;
{
struct ifnet *ifp;
struct tun_softc *tp;
register int unit, error;
error = suser(p->p_ucred, &p->p_acflag);
if (error)
return (error);
if ((unit = dev_val(minor(dev))) >= NTUN)
return (ENXIO);
tp = &tunctl[unit];
if (tp->tun_flags & TUN_OPEN)
return EBUSY;
ifp = &tp->tun_if;
tp->tun_flags |= TUN_OPEN;
TUNDEBUG("%s%d: open\n", ifp->if_name, ifp->if_unit);
return (0);
}
static int
tunclose(dev, foo, bar, p)
dev_t dev;
int foo;
int bar;
struct proc *p;
{
register int unit = dev_val(minor(dev)), s;
struct tun_softc *tp = &tunctl[unit];
struct ifnet *ifp = &tp->tun_if;
struct mbuf *m;
tp->tun_flags &= ~TUN_OPEN;
do {
s = splimp();
IF_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m)
m_freem(m);
} while (m);
if (ifp->if_flags & IFF_UP) {
s = splimp();
if_down(ifp);
if (ifp->if_flags & IFF_RUNNING) {
register struct ifaddr *ifa;
for (ifa = ifp->if_addrhead.tqh_first; ifa;
ifa = ifa->ifa_link.tqe_next) {
switch (ifa->ifa_addr->sa_family) {
#if INET
case AF_INET:
#endif
#if INET6
case AF_INET6:
#endif
rtinit(ifa, (int)RTM_DELETE,
tp->tun_flags & TUN_DSTADDR ? RTF_HOST : 0);
break;
}
}
}
splx(s);
}
ifp->if_flags &= ~IFF_RUNNING;
funsetown(tp->tun_sigio);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
selwakeup(&tp->tun_rsel);
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
TUNDEBUG ("%s%d: closed\n", ifp->if_name, ifp->if_unit);
return (0);
}
static int
tuninit(unit, cmd, af)
int unit;
int cmd;
u_char af;
{
struct tun_softc *tp = &tunctl[unit];
struct ifnet *ifp = &tp->tun_if;
register struct ifaddr *ifa;
TUNDEBUG("%s%d: tuninit\n", ifp->if_name, ifp->if_unit);
ifp->if_flags |= IFF_UP | IFF_RUNNING;
getmicrotime(&ifp->if_lastchange);
for (ifa = ifp->if_addrhead.tqh_first; ifa;
ifa = ifa->ifa_link.tqe_next) {
#if INET
if (ifa->ifa_addr->sa_family == AF_INET) {
struct sockaddr_in *si;
si = (struct sockaddr_in *)ifa->ifa_addr;
if (si && si->sin_addr.s_addr)
tp->tun_flags |= TUN_IASET;
si = (struct sockaddr_in *)ifa->ifa_dstaddr;
if (si && si->sin_addr.s_addr)
tp->tun_flags |= TUN_DSTADDR;
}
#endif
}
return 0;
}
int
tunifioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
register struct ifreq *ifr = (struct ifreq *)data;
int error = 0, s;
s = splimp();
switch(cmd) {
case SIOCSIFADDR:
tuninit(ifp->if_unit);
TUNDEBUG("%s%d: address set\n",
ifp->if_name, ifp->if_unit);
break;
case SIOCSIFDSTADDR:
#if 0
#if defined(INET6) && defined(__FreeBSD__) && __FreeBSD__ >= 3
if (found_first_ifid == 0)
in6_ifattach_noifid(ifp);
#endif
#endif
tuninit(ifp->if_unit, cmd, ifr->ifr_addr.sa_family);
break;
case SIOCSIFMTU:
ifp->if_mtu = ifr->ifr_mtu;
TUNDEBUG("%s%d: mtu set\n",
ifp->if_name, ifp->if_unit);
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCSIFFLAGS:
if ((ifp->if_flags & IFF_UP) != 0)
ifp->if_flags |= IFF_RUNNING;
else if ((ifp->if_flags & IFF_UP) == 0)
ifp->if_flags &= ~IFF_RUNNING;
break;
default:
error = EINVAL;
}
splx(s);
return (error);
}
int
tunoutput(ifp, m0, dst, rt)
struct ifnet *ifp;
struct mbuf *m0;
struct sockaddr *dst;
struct rtentry *rt;
{
struct tun_softc *tp = &tunctl[ifp->if_unit];
int s;
TUNDEBUG ("%s%d: tunoutput\n", ifp->if_name, ifp->if_unit);
if ((tp->tun_flags & TUN_READY) != TUN_READY) {
TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
ifp->if_unit, tp->tun_flags);
m_freem (m0);
return EHOSTDOWN;
}
#if NBPFILTER > 0
if (dst->sa_family == AF_UNSPEC) {
dst->sa_family = *(mtod(m0, int *));
m0->m_len -= sizeof(int);
m0->m_pkthdr.len -= sizeof(int);
m0->m_data += sizeof(int);
}
if (ifp->if_bpf) {
struct mbuf m;
u_int af = dst->sa_family;
m.m_next = m0;
m.m_len = 4;
m.m_data = (char *)⁡
bpf_mtap(ifp, &m);
}
#endif
switch(dst->sa_family) {
#if defined(INET) || defined(INET6)
#if INET6
case AF_INET6:
M_PREPEND(m0, sizeof(u_long) ,
M_DONTWAIT);
if (m0 == 0)
return (ENOBUFS);
*mtod(m0, u_long *) = (u_long)dst->sa_family;
#endif
#if INET
case AF_INET:
#endif
#endif
s = splimp();
if (IF_QFULL(&ifp->if_snd)) {
IF_DROP(&ifp->if_snd);
m_freem(m0);
splx(s);
ifp->if_collisions++;
return (ENOBUFS);
}
ifp->if_obytes += m0->m_pkthdr.len;
IF_ENQUEUE(&ifp->if_snd, m0);
splx(s);
ifp->if_opackets++;
break;
default:
m_freem(m0);
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_sigio)
pgsigio(tp->tun_sigio, SIGIO, 0);
thread_funnel_switch(NETWORK_FUNNEL, KERNEL_FUNNEL);
selwakeup(&tp->tun_rsel);
thread_funnel_switch(KERNEL_FUNNEL, NETWORK_FUNNEL);
return 0;
}
static int
tunioctl(dev, cmd, data, flag, p)
dev_t dev;
u_long cmd;
caddr_t data;
int flag;
struct proc *p;
{
int unit = dev_val(minor(dev)), s;
struct tun_softc *tp = &tunctl[unit];
struct tuninfo *tunp;
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_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->baudrate = tp->tun_if.if_baudrate;
break;
case TUNSDEBUG:
tundebug = *(int *)data;
break;
case TUNGDEBUG:
*(int *)data = tundebug;
break;
case FIONBIO:
break;
case FIOASYNC:
if (*(int *)data)
tp->tun_flags |= TUN_ASYNC;
else
tp->tun_flags &= ~TUN_ASYNC;
break;
case FIONREAD:
s = splimp();
if (tp->tun_if.if_snd.ifq_head) {
struct mbuf *mb = tp->tun_if.if_snd.ifq_head;
for( *(int *)data = 0; mb != 0; mb = mb->m_next)
*(int *)data += mb->m_len;
} else
*(int *)data = 0;
splx(s);
break;
case FIOSETOWN:
return (fsetown(*(int *)data, &tp->tun_sigio));
case FIOGETOWN:
*(int *)data = fgetown(tp->tun_sigio);
return (0);
case TIOCSPGRP:
return (fsetown(-(*(int *)data), &tp->tun_sigio));
case TIOCGPGRP:
*(int *)data = -fgetown(tp->tun_sigio);
return (0);
default:
return (ENOTTY);
}
return (0);
}
static int
tunread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit = dev_val(minor(dev));
struct tun_softc *tp = &tunctl[unit];
struct ifnet *ifp = &tp->tun_if;
struct mbuf *m, *m0;
int error=0, len, s;
TUNDEBUG ("%s%d: read\n", ifp->if_name, ifp->if_unit);
if ((tp->tun_flags & TUN_READY) != TUN_READY) {
TUNDEBUG ("%s%d: not ready 0%o\n", ifp->if_name,
ifp->if_unit, tp->tun_flags);
return EHOSTDOWN;
}
tp->tun_flags &= ~TUN_RWAIT;
s = splimp();
do {
IF_DEQUEUE(&ifp->if_snd, m0);
if (m0 == 0) {
if (flag & IO_NDELAY) {
splx(s);
return EWOULDBLOCK;
}
tp->tun_flags |= TUN_RWAIT;
if( error = tsleep((caddr_t)tp, PCATCH | (PZERO + 1),
"tunread", 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)
break;
error = uiomove(mtod(m0, caddr_t), len, uio);
MFREE(m0, m);
m0 = m;
}
if (m0) {
TUNDEBUG("Dropping mbuf\n");
m_freem(m0);
}
return error;
}
static int
tunwrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit = dev_val(minor(dev));
struct ifnet *ifp = &tunctl[unit].tun_if;
struct mbuf *top, **mp, *m;
int error=0, s, tlen, mlen;
u_long af;
u_int netisr_af;
struct ifqueue *afintrq = NULL;
TUNDEBUG("%s%d: tunwrite\n", ifp->if_name, ifp->if_unit);
if (uio->uio_resid < 0 || uio->uio_resid > TUNMRU) {
TUNDEBUG("%s%d: len=%d!\n", ifp->if_name, ifp->if_unit,
uio->uio_resid);
return EIO;
}
tlen = uio->uio_resid;
MGETHDR(m, M_DONTWAIT, MT_DATA);
if (m == NULL)
return ENOBUFS;
if (tlen > MHLEN) {
MCLGET(m, M_DONTWAIT);
if ((m->m_flags & M_EXT) == 0) {
m_free(m);
return ENOBUFS;
}
mlen = m->m_ext.ext_size;
} else
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 (uio->uio_resid > 0) {
MGET (m, M_DONTWAIT, MT_DATA);
if (m == 0) {
error = ENOBUFS;
break;
}
mlen = MLEN;
}
}
af = *mtod(top, u_long *);
switch (af) {
#if INET
case AF_INET:
netisr_af = NETISR_IP;
afintrq = &ipintrq;
break;
#endif
#if INET6
case AF_INET6:
netisr_af = NETISR_IPV6;
afintrq = &ip6intrq;
break;
#endif
default:
if (af > 255) {
af = AF_INET;
netisr_af = NETISR_IP;
afintrq = &ipintrq;
goto af_decided;
}
error = EAFNOSUPPORT;
break;
}
m_adj(top, sizeof(u_long));
tlen -= sizeof(u_long);
af_decided:
if (error) {
if (top)
m_freem (top);
return error;
}
top->m_pkthdr.len = tlen;
top->m_pkthdr.rcvif = ifp;
#if NBPFILTER > 0
if (ifp->if_bpf) {
struct mbuf m;
m.m_next = top;
m.m_len = 4;
m.m_data = (char *)⁡
bpf_mtap(ifp, &m);
}
#endif
if (!afintrq)
return EAFNOSUPPORT;
s = splimp();
if (IF_QFULL (afintrq)) {
IF_DROP(afintrq);
splx(s);
ifp->if_collisions++;
m_freem(top);
return ENOBUFS;
}
IF_ENQUEUE(afintrq, top);
splx(s);
ifp->if_ibytes += tlen;
ifp->if_ipackets++;
schednetisr(netisr_af);
return error;
}
static int
tunpoll(dev, events, p)
dev_t dev;
int events;
struct proc *p;
{
int unit = dev_val(minor(dev)), s;
struct tun_softc *tp = &tunctl[unit];
struct ifnet *ifp = &tp->tun_if;
int revents = 0;
s = splimp();
TUNDEBUG("%s%d: tunpoll\n", ifp->if_name, ifp->if_unit);
if (events & (POLLIN | POLLRDNORM))
if (ifp->if_snd.ifq_len > 0) {
TUNDEBUG("%s%d: tunpoll q=%d\n", ifp->if_name,
ifp->if_unit, ifp->if_snd.ifq_len);
revents |= events & (POLLIN | POLLRDNORM);
} else {
TUNDEBUG("%s%d: tunpoll waiting\n", ifp->if_name,
ifp->if_unit);
selrecord(p, &tp->tun_rsel);
}
if (events & (POLLOUT | POLLWRNORM))
revents |= events & (POLLOUT | POLLWRNORM);
splx(s);
return (revents);
}
#endif