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Add cloning support to the loopback interface.

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Submitted by:	mux
This commit is contained in:
Brooks Davis 2002-03-04 21:46:00 +00:00
parent b75496fedf
commit 3d4ce33dbf
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=91648
1 changed files with 99 additions and 56 deletions
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155
sys/net/if_loop.c
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@ -49,6 +49,8 @@
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
@ -88,12 +90,6 @@
#include <netatalk/at_var.h>
#endif
int loioctl __P((struct ifnet *, u_long, caddr_t));
static void lortrequest __P((int, struct rtentry *, struct rt_addrinfo *));
int looutput __P((struct ifnet *ifp,
struct mbuf *m, struct sockaddr *dst, struct rtentry *rt));
#ifdef TINY_LOMTU
#define LOMTU (1024+512)
#elif defined(LARGE_LOMTU)
@ -102,26 +98,93 @@ int looutput __P((struct ifnet *ifp,
#define LOMTU 16384
#endif
static int nloop = 1;
struct ifnet *loif; /* Used externally */
static MALLOC_DEFINE(M_LO, "lo", "Loopback Interface");
#define LONAME "lo"
#define LOMAXUNIT 0x7fff /* ifp->if_unit is only 15 bits */
struct lo_softc {
struct ifnet sc_if; /* network-visible interface */
LIST_ENTRY(lo_softc) sc_next;
struct resource *r_unit;
};
int loioctl(struct ifnet *, u_long, caddr_t);
static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
int looutput(struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt);
int lo_clone_create(struct if_clone *, int *);
int lo_clone_destroy(struct ifnet *);
static void locreate(int, struct resource *);
struct ifnet *loif = NULL; /* Used externally */
static MALLOC_DEFINE(M_LO, LONAME, "Loopback Interface");
static LIST_HEAD(lo_list, lo_softc) lo_list;
struct if_clone lo_cloner =
IF_CLONE_INITIALIZER(LONAME, lo_clone_create, lo_clone_destroy);
static struct rman lounits[1];
int
lo_clone_create(ifc, unit)
struct if_clone *ifc;
int *unit;
{
struct resource *r;
if (*unit > LOMAXUNIT)
return (ENXIO);
if (*unit < 0) {
r = rman_reserve_resource(lounits, 0, LOMAXUNIT, 1,
RF_ALLOCATED | RF_ACTIVE, NULL);
if (r == NULL)
return (ENOSPC);
*unit = rman_get_start(r);
} else {
r = rman_reserve_resource(lounits, *unit, *unit, 1,
RF_ALLOCATED | RF_ACTIVE, NULL);
if (r == NULL)
return (EEXIST);
}
locreate(*unit, r);
return (0);
}
int
lo_clone_destroy(ifp)
struct ifnet *ifp;
{
int err;
struct lo_softc *sc;
sc = ifp->if_softc;
/*
* Prevent lo0 from being destroyed.
*/
if (loif == ifp)
return (EINVAL);
err = rman_release_resource(sc->r_unit);
KASSERT(err == 0, ("Unexpected error freeing resource"));
bpfdetach(ifp);
if_detach(ifp);
LIST_REMOVE(sc, sc_next);
FREE(sc, M_LO);
return (0);
}
static void
locreate(int unit)
locreate(int unit, struct resource *r)
{
struct lo_softc *sc;
MALLOC(sc, struct lo_softc *, sizeof(*sc), M_LO, M_WAITOK | M_ZERO);
sc->sc_if.if_name = "lo";
sc->sc_if.if_name = LONAME;
sc->sc_if.if_unit = unit;
sc->sc_if.if_mtu = LOMTU;
sc->sc_if.if_flags = IFF_LOOPBACK | IFF_MULTICAST;
@ -129,6 +192,8 @@ locreate(int unit)
sc->sc_if.if_output = looutput;
sc->sc_if.if_type = IFT_LOOP;
sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
sc->sc_if.if_softc = sc;
sc->r_unit = r;
if_attach(&sc->sc_if);
bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
LIST_INSERT_HEAD(&lo_list, sc, sc_next);
@ -136,55 +201,33 @@ locreate(int unit)
loif = &sc->sc_if;
}
static void
lodestroy(struct lo_softc *sc)
{
bpfdetach(&sc->sc_if);
if_detach(&sc->sc_if);
LIST_REMOVE(sc, sc_next);
FREE(sc, M_LO);
}
static int
sysctl_net_nloop(SYSCTL_HANDLER_ARGS)
{
int newnloop;
int error;
newnloop = nloop;
error = sysctl_handle_opaque(oidp, &newnloop, sizeof newnloop, req);
if (error || !req->newptr)
return (error);
if (newnloop < 1)
return (EINVAL);
while (newnloop > nloop) {
locreate(nloop);
nloop++;
}
while (newnloop < nloop) {
lodestroy(LIST_FIRST(&lo_list));
nloop--;
}
return (0);
}
SYSCTL_PROC(_net, OID_AUTO, nloop, CTLTYPE_INT | CTLFLAG_RW,
0, 0, sysctl_net_nloop, "I", "");
static int
loop_modevent(module_t mod, int type, void *data)
{
int i;
int err;
int unit;
switch (type) {
case MOD_LOAD:
TUNABLE_INT_FETCH("net.nloop", &nloop);
if (nloop < 1) /* sanity check */
nloop = 1;
for (i = 0; i < nloop; i++)
locreate(i);
lounits->rm_type = RMAN_ARRAY;
lounits->rm_descr = "configurable if_loop units";
err = rman_init(lounits);
if (err != 0)
return (err);
err = rman_manage_region(lounits, 0, LOMAXUNIT);
if (err != 0) {
printf("%s: lounits: rman_manage_region: Failed %d\n",
LONAME, err);
rman_fini(lounits);
return (err);
}
LIST_INIT(&lo_list);
if_clone_attach(&lo_cloner);
/* Create lo0 */
unit = 0;
err = lo_clone_create(NULL, &unit);
KASSERT(err == 0, ("%s: can't create lo0", __func__));
break;
case MOD_UNLOAD:
printf("loop module unload - not possible for this module type\n");