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-rw-r--r--sys/fs/devfs/devfs_vnops.c3
-rw-r--r--sys/net/if_tun.c221
-rw-r--r--sys/net/if_tunvar.h1
3 files changed, 132 insertions, 93 deletions
diff --git a/sys/fs/devfs/devfs_vnops.c b/sys/fs/devfs/devfs_vnops.c
index bbc14dc58d5a..b8d5cceb4efb 100644
--- a/sys/fs/devfs/devfs_vnops.c
+++ b/sys/fs/devfs/devfs_vnops.c
@@ -572,7 +572,8 @@ devfs_reclaim(ap)
vp->v_data = NULL;
if (vp->v_rdev != NODEV && vp->v_rdev != NULL) {
i = vcount(vp);
- if ((vp->v_rdev->si_flags & SI_CHEAPCLONE) && i == 0)
+ if ((vp->v_rdev->si_flags & SI_CHEAPCLONE) && i == 0 &&
+ (vp->v_rdev->si_flags & SI_NAMED))
destroy_dev(vp->v_rdev);
}
return (0);
diff --git a/sys/net/if_tun.c b/sys/net/if_tun.c
index 076f9aee79ef..0a0b9ce49495 100644
--- a/sys/net/if_tun.c
+++ b/sys/net/if_tun.c
@@ -36,42 +36,46 @@
#include <sys/uio.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
+#include <machine/bus.h> /* XXX Shouldn't really be required ! */
+#include <sys/rman.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/intrq.h>
-
#ifdef INET
#include <netinet/in.h>
#endif
-
#include <net/bpf.h>
-
#include <net/if_tunvar.h>
#include <net/if_tun.h>
-static MALLOC_DEFINE(M_TUN, "tun", "Tunnel Interface");
-
-static void tuncreate __P((dev_t dev));
-
#define TUNDEBUG if (tundebug) printf
+#define TUNNAME "tun"
+#define TUN_MAXUNIT 0x7fff /* ifp->if_unit is only 15 bits */
+
+static MALLOC_DEFINE(M_TUN, TUNNAME, "Tunnel Interface");
static int tundebug = 0;
static struct tun_softc *tunhead = NULL;
+static struct rman tununits[1];
+static udev_t tunbasedev = NOUDEV;
SYSCTL_INT(_debug, OID_AUTO, if_tun_debug, CTLFLAG_RW, &tundebug, 0, "");
-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((struct ifnet *));
-static void tunstart __P((struct ifnet *));
-
-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;
+static void tunclone(void *arg, char *name, int namelen, dev_t *dev);
+static void tuncreate(dev_t dev);
+static int tunifioctl(struct ifnet *, u_long, caddr_t);
+static int tuninit(struct ifnet *);
+static int tunmodevent(module_t, int, void *);
+static int tunoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
+ struct rtentry *rt);
+static void tunstart(struct ifnet *);
+
+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 = {
@@ -83,35 +87,53 @@ static struct cdevsw tun_cdevsw = {
/* poll */ tunpoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
- /* name */ "tun",
+ /* name */ TUNNAME,
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
};
-static void tun_clone __P((void *arg, char *name, int namelen, dev_t *dev));
-
static void
-tun_clone(arg, name, namelen, dev)
- void *arg;
- char *name;
- int namelen;
- dev_t *dev;
+tunclone(void *arg, char *name, int namelen, dev_t *dev)
{
+ struct resource *r;
+ int err;
int u;
if (*dev != NODEV)
return;
- if (dev_stdclone(name, NULL, "tun", &u) != 1)
- return;
+
+ if (strcmp(name, TUNNAME) == 0) {
+ r = rman_reserve_resource(tununits, 0, TUN_MAXUNIT, 1,
+ RF_ALLOCATED | RF_ACTIVE, NULL);
+ u = rman_get_start(r);
+ err = rman_release_resource(r);
+ KASSERT(err == 0, ("Unexpected failure releasing resource"));
+ *dev = makedev(CDEV_MAJOR, unit2minor(u));
+ if ((*dev)->si_flags & SI_NAMED)
+ return; /* Already make_dev()d */
+ } else if (dev_stdclone(name, NULL, TUNNAME, &u) != 1)
+ return; /* Don't recognise the name */
+
*dev = make_dev(&tun_cdevsw, unit2minor(u),
UID_ROOT, GID_WHEEL, 0600, "tun%d", u);
- (*dev)->si_flags |= SI_CHEAPCLONE;
+
+ /*
+ * All devices depend on tunbasedev so that we can simply
+ * destroy_dev() this device at module unload time to get
+ * rid of all our make_dev()d resources.
+ */
+ if (tunbasedev == NOUDEV)
+ tunbasedev = (*dev)->si_udev;
+ else {
+ (*dev)->si_flags |= SI_CHEAPCLONE;
+ dev_depends(udev2dev(tunbasedev, 0), *dev);
+ }
}
static int
-tun_modevent(module_t mod, int type, void *data)
+tunmodevent(module_t mod, int type, void *data)
{
static eventhandler_tag tag;
struct tun_softc *tp;
@@ -120,19 +142,44 @@ tun_modevent(module_t mod, int type, void *data)
switch (type) {
case MOD_LOAD:
- tag = EVENTHANDLER_REGISTER(dev_clone, tun_clone, 0, 1000);
+ tag = EVENTHANDLER_REGISTER(dev_clone, tunclone, 0, 1000);
if (tag == NULL)
return (ENOMEM);
- err = cdevsw_add(&tun_cdevsw);
+ if (!devfs_present) {
+ err = cdevsw_add(&tun_cdevsw);
+ if (err != 0) {
+ EVENTHANDLER_DEREGISTER(dev_clone, tag);
+ return (err);
+ }
+ }
+ tununits->rm_type = RMAN_ARRAY;
+ tununits->rm_descr = "open if_tun units";
+ err = rman_init(tununits);
if (err != 0) {
+ cdevsw_remove(&tun_cdevsw);
+ EVENTHANDLER_DEREGISTER(dev_clone, tag);
+ return (err);
+ }
+ err = rman_manage_region(tununits, 0, TUN_MAXUNIT);
+ if (err != 0) {
+ printf("%s: tununits: rman_manage_region: Failed %d\n",
+ TUNNAME, err);
+ rman_fini(tununits);
+ cdevsw_remove(&tun_cdevsw);
EVENTHANDLER_DEREGISTER(dev_clone, tag);
return (err);
}
break;
case MOD_UNLOAD:
+ err = rman_fini(tununits);
+ if (err != 0)
+ return (err);
+ EVENTHANDLER_DEREGISTER(dev_clone, tag);
+
while (tunhead != NULL) {
- if (tunhead->tun_flags & TUN_OPEN)
- return (EBUSY);
+ KASSERT((tunhead->tun_flags & TUN_OPEN) == 0,
+ ("tununits is out of sync - unit %d",
+ tunhead->tun_if.if_unit));
tp = tunhead;
dev = makedev(tun_cdevsw.d_maj,
unit2minor(tp->tun_if.if_unit));
@@ -141,11 +188,18 @@ tun_modevent(module_t mod, int type, void *data)
bpfdetach(&tp->tun_if);
if_detach(&tp->tun_if);
KASSERT(dev->si_flags & SI_NAMED, ("Missing make_dev"));
- destroy_dev(dev);
FREE(tp, M_TUN);
}
- cdevsw_remove(&tun_cdevsw);
- EVENTHANDLER_DEREGISTER(dev_clone, tag);
+
+ /*
+ * Destroying tunbasedev results in all of our make_dev()s
+ * conveniently going away.
+ */
+ if (tunbasedev != NOUDEV)
+ destroy_dev(udev2dev(tunbasedev, 0));
+
+ if (!devfs_present)
+ cdevsw_remove(&tun_cdevsw);
break;
}
return 0;
@@ -153,15 +207,14 @@ tun_modevent(module_t mod, int type, void *data)
static moduledata_t tun_mod = {
"if_tun",
- tun_modevent,
+ tunmodevent,
0
};
DECLARE_MODULE(if_tun, tun_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
static void
-tunstart(ifp)
- struct ifnet *ifp;
+tunstart(struct ifnet *ifp)
{
struct tun_softc *tp = ifp->if_softc;
@@ -175,8 +228,7 @@ tunstart(ifp)
}
static void
-tuncreate(dev)
- dev_t dev;
+tuncreate(dev_t dev)
{
struct tun_softc *sc;
struct ifnet *ifp;
@@ -192,7 +244,7 @@ tuncreate(dev)
ifp = &sc->tun_if;
ifp->if_unit = dev2unit(dev);
- ifp->if_name = "tun";
+ ifp->if_name = TUNNAME;
ifp->if_mtu = TUNMTU;
ifp->if_ioctl = tunifioctl;
ifp->if_output = tunoutput;
@@ -206,31 +258,35 @@ tuncreate(dev)
dev->si_drv1 = sc;
}
-/*
- * tunnel open. We assume that any tun_clone() call is immediately
- * followed by a call to tunopen() - otherwise nothing will ever
- * destroy_dev() the specinfo.
- */
-static int
-tunopen(dev, flag, mode, p)
- dev_t dev;
- int flag, mode;
- struct proc *p;
+static int
+tunopen(dev_t dev, int flag, int mode, struct proc *p)
{
+ struct resource *r;
struct ifnet *ifp;
struct tun_softc *tp;
+ int unit;
+
+ unit = dev2unit(dev);
+ if (unit > TUN_MAXUNIT)
+ return (ENXIO);
+
+ r = rman_reserve_resource(tununits, unit, unit, 1,
+ RF_ALLOCATED | RF_ACTIVE, NULL);
+ if (r == NULL)
+ return (EBUSY);
tp = dev->si_drv1;
if (!tp) {
tuncreate(dev);
tp = dev->si_drv1;
}
- if (tp->tun_flags & TUN_OPEN)
- return EBUSY;
+ KASSERT(!(tp->tun_flags & TUN_OPEN), ("Resource & flags out-of-sync"));
+ tp->r_unit = r;
tp->tun_pid = p->p_pid;
ifp = &tp->tun_if;
tp->tun_flags |= TUN_OPEN;
TUNDEBUG("%s%d: open\n", ifp->if_name, ifp->if_unit);
+
return (0);
}
@@ -239,19 +295,18 @@ tunopen(dev, flag, mode, p)
* routing info
*/
static int
-tunclose(dev, foo, bar, p)
- dev_t dev;
- int foo;
- int bar;
- struct proc *p;
+tunclose(dev_t dev, int foo, int bar, struct proc *p)
{
- register int s;
struct tun_softc *tp;
- struct ifnet *ifp;
+ struct ifnet *ifp;
+ int s;
+ int err;
tp = dev->si_drv1;
ifp = &tp->tun_if;
+ err = rman_release_resource(tp->r_unit);
+ KASSERT(err == 0, ("Unit %d not marked open", ifp->if_unit));
tp->tun_flags &= ~TUN_OPEN;
tp->tun_pid = 0;
@@ -287,8 +342,7 @@ tunclose(dev, foo, bar, p)
}
static int
-tuninit(ifp)
- struct ifnet *ifp;
+tuninit(struct ifnet *ifp)
{
struct tun_softc *tp = ifp->if_softc;
register struct ifaddr *ifa;
@@ -327,10 +381,7 @@ tuninit(ifp)
* Process an ioctl request.
*/
int
-tunifioctl(ifp, cmd, data)
- struct ifnet *ifp;
- u_long cmd;
- caddr_t data;
+tunifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ifreq *ifr = (struct ifreq *)data;
struct tun_softc *tp = ifp->if_softc;
@@ -374,11 +425,11 @@ tunifioctl(ifp, cmd, data)
* tunoutput - queue packets from higher level ready to put out.
*/
int
-tunoutput(ifp, m0, dst, rt)
- struct ifnet *ifp;
- struct mbuf *m0;
- struct sockaddr *dst;
- struct rtentry *rt;
+tunoutput(
+ struct ifnet *ifp,
+ struct mbuf *m0,
+ struct sockaddr *dst,
+ struct rtentry *rt)
{
struct tun_softc *tp = ifp->if_softc;
@@ -465,12 +516,7 @@ tunoutput(ifp, m0, dst, rt)
* the cdevsw interface is now pretty minimal.
*/
static int
-tunioctl(dev, cmd, data, flag, p)
- dev_t dev;
- u_long cmd;
- caddr_t data;
- int flag;
- struct proc *p;
+tunioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p)
{
int s;
int error;
@@ -583,10 +629,7 @@ tunioctl(dev, cmd, data, flag, p)
* least as much of a packet as can be read.
*/
static int
-tunread(dev, uio, flag)
- dev_t dev;
- struct uio *uio;
- int flag;
+tunread(dev_t dev, struct uio *uio, int flag)
{
struct tun_softc *tp = dev->si_drv1;
struct ifnet *ifp = &tp->tun_if;
@@ -640,10 +683,7 @@ tunread(dev, uio, flag)
* the cdevsw write interface - an atomic write is a packet - or else!
*/
static int
-tunwrite(dev, uio, flag)
- dev_t dev;
- struct uio *uio;
- int flag;
+tunwrite(dev_t dev, struct uio *uio, int flag)
{
struct tun_softc *tp = dev->si_drv1;
struct ifnet *ifp = &tp->tun_if;
@@ -749,10 +789,7 @@ tunwrite(dev, uio, flag)
* anyway, it either accepts the packet or drops it.
*/
static int
-tunpoll(dev, events, p)
- dev_t dev;
- int events;
- struct proc *p;
+tunpoll(dev_t dev, int events, struct proc *p)
{
int s;
struct tun_softc *tp = dev->si_drv1;
diff --git a/sys/net/if_tunvar.h b/sys/net/if_tunvar.h
index e5583f0eb09d..d49213f4890d 100644
--- a/sys/net/if_tunvar.h
+++ b/sys/net/if_tunvar.h
@@ -50,6 +50,7 @@ struct tun_softc {
struct selinfo tun_wsel; /* write select (not used) */
struct tun_softc *next; /* Next softc in list */
+ struct resource *r_unit; /* resource allocated for this unit */
};
#endif /* !_NET_IF_TUNVAR_H_ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-17 01:51:24 +0000