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Make the number of loopback interfaces dynamically tunable. Why one

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would *want* to is a different story, but it used to be able to be done
statically.  Get rid of #include "loop.h" and struct ifnet loif[NLOOP];
This could be used as an example of how to do this in other drivers,
for example: ccd.
This commit is contained in:
Peter Wemm 2001-01-29 11:06:26 +00:00
parent e50fa3d247
commit 90d9802fe7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=71791
2 changed files with 79 additions and 17 deletions
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94
sys/net/if_loop.c
View file

@ -37,7 +37,6 @@
/*
* Loopback interface driver for protocol testing and timing.
*/
#include "loop.h"
#include "opt_atalk.h"
#include "opt_inet.h"
@ -47,9 +46,11 @@
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_types.h>
@ -102,28 +103,89 @@ int looutput __P((struct ifnet *ifp,
#define LOMTU 16384
#endif
struct ifnet loif[NLOOP];
static int nloop;
struct ifnet *loif; /* Used externally */
static MALLOC_DEFINE(M_LO, "lo", "Loopback Interface");
struct lo_softc {
struct ifnet sc_if; /* network-visible interface */
LIST_ENTRY(lo_softc) sc_next;
};
static LIST_HEAD(lo_list, lo_softc) lo_list;
static void
locreate(int unit)
{
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_unit = unit;
sc->sc_if.if_mtu = LOMTU;
sc->sc_if.if_flags = IFF_LOOPBACK | IFF_MULTICAST;
sc->sc_if.if_ioctl = loioctl;
sc->sc_if.if_output = looutput;
sc->sc_if.if_type = IFT_LOOP;
sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
if_attach(&sc->sc_if);
bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
LIST_INSERT_HEAD(&lo_list, sc, sc_next);
if (loif == NULL)
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", "");
/* ARGSUSED */
static void
loopattach(dummy)
void *dummy;
{
register struct ifnet *ifp;
register int i = 0;
int i;
for (ifp = loif; i < NLOOP; ifp++) {
ifp->if_name = "lo";
ifp->if_unit = i++;
ifp->if_mtu = LOMTU;
ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
ifp->if_ioctl = loioctl;
ifp->if_output = looutput;
ifp->if_type = IFT_LOOP;
ifp->if_snd.ifq_maxlen = ifqmaxlen;
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(u_int));
}
TUNABLE_INT_FETCH("net.nloop", 1, nloop);
if (nloop < 1) /* sanity check */
nloop = 1;
for (i = 0; i < nloop; i++)
locreate(i);
}
int

2
sys/net/if_var.h
View file

@ -372,7 +372,7 @@ struct ifmultiaddr {
extern struct ifnethead ifnet;
extern struct ifnet **ifindex2ifnet;
extern int ifqmaxlen;
extern struct ifnet loif[];
extern struct ifnet *loif; /* first loopback interface */
extern int if_index;
extern struct ifaddr **ifnet_addrs;