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Make discard devices clonable and unloadable. Also, change the

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interface name from ds# to disc#.
This commit is contained in:
Brooks Davis 2002-05-25 20:20:35 +00:00
parent ae5a19be8e
commit c69b7ffe7d
1 changed files with 57 additions and 15 deletions
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72
sys/net/if_disc.c
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@ -42,6 +42,7 @@
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
@ -61,20 +62,39 @@
#define DSMTU 65532
#endif
static void discattach(void);
#define DISCNAME "disc"
static struct ifnet discif;
static int discoutput(struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *);
static void discrtrequest(int, struct rtentry *, struct rt_addrinfo *);
static int discioctl(struct ifnet *, u_long, caddr_t);
struct disc_softc {
struct ifnet sc_if; /* must be first */
LIST_ENTRY(disc_softc) sc_list;
};
static void
discattach(void)
static int discoutput(struct ifnet *, struct mbuf *,
struct sockaddr *, struct rtentry *);
static void discrtrequest(int, struct rtentry *, struct rt_addrinfo *);
static int discioctl(struct ifnet *, u_long, caddr_t);
static int disc_clone_create(struct if_clone *, int);
static void disc_clone_destroy(struct ifnet *);
static MALLOC_DEFINE(M_DISC, DISCNAME, "Discard interface");
static LIST_HEAD(, disc_softc) disc_softc_list;
static struct if_clone disc_cloner = IF_CLONE_INITIALIZER(DISCNAME,
disc_clone_create, disc_clone_destroy, 0, IF_MAXUNIT);
static int
disc_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp = &discif;
struct ifnet *ifp;
struct disc_softc *sc;
ifp->if_name = "ds";
sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK);
bzero(sc, sizeof(struct disc_softc));
ifp = &sc->sc_if;
ifp->if_softc = sc;
ifp->if_name = DISCNAME;
ifp->if_unit = unit;
ifp->if_mtu = DSMTU;
ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
ifp->if_ioctl = discioctl;
@ -85,6 +105,23 @@ discattach(void)
ifp->if_snd.ifq_maxlen = 20;
if_attach(ifp);
bpfattach(ifp, DLT_NULL, sizeof(u_int));
LIST_INSERT_HEAD(&disc_softc_list, sc, sc_list);
return (0);
}
static void
disc_clone_destroy(struct ifnet *ifp)
{
struct disc_softc *sc;
sc = ifp->if_softc;
LIST_REMOVE(sc, sc_list);
bpfdetach(ifp);
if_detach(ifp);
free(sc, M_DISC);
}
static int
@ -92,11 +129,16 @@ disc_modevent(module_t mod, int type, void *data)
{
switch (type) {
case MOD_LOAD:
discattach();
LIST_INIT(&disc_softc_list);
if_clone_attach(&disc_cloner);
break;
case MOD_UNLOAD:
printf("if_disc module unload - not possible for this module type\n");
return EINVAL;
if_clone_detach(&disc_cloner);
while (!LIST_EMPTY(&disc_softc_list))
disc_clone_destroy(
&LIST_FIRST(&disc_softc_list)->sc_if);
break;
}
return 0;
}
@ -123,7 +165,7 @@ discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
m->m_data += sizeof(int);
}
if (discif.if_bpf) {
if (ifp->if_bpf) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
@ -138,7 +180,7 @@ discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
m0.m_len = 4;
m0.m_data = (char *)&af;
bpf_mtap(&discif, &m0);
bpf_mtap(ifp, &m0);
}
m->m_pkthdr.rcvif = ifp;