256 lines
6.1 KiB
C
256 lines
6.1 KiB
C
/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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/*
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* Discard interface driver for protocol testing and timing.
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* (Based on the loopback.)
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#ifdef TINY_DSMTU
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#define DSMTU (1024+512)
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#else
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#define DSMTU 65532
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#endif
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#define DISCNAME "disc"
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struct disc_softc {
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struct ifnet sc_if; /* must be first */
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LIST_ENTRY(disc_softc) sc_list;
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};
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static int discoutput(struct ifnet *, struct mbuf *,
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struct sockaddr *, struct rtentry *);
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static void discrtrequest(int, struct rtentry *, struct rt_addrinfo *);
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static int discioctl(struct ifnet *, u_long, caddr_t);
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static int disc_clone_create(struct if_clone *, int);
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static void disc_clone_destroy(struct ifnet *);
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static MALLOC_DEFINE(M_DISC, DISCNAME, "Discard interface");
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static LIST_HEAD(, disc_softc) disc_softc_list;
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static struct if_clone disc_cloner = IF_CLONE_INITIALIZER(DISCNAME,
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disc_clone_create, disc_clone_destroy, 0, IF_MAXUNIT);
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static int
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disc_clone_create(struct if_clone *ifc, int unit)
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{
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struct ifnet *ifp;
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struct disc_softc *sc;
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sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK);
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bzero(sc, sizeof(struct disc_softc));
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ifp = &sc->sc_if;
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ifp->if_softc = sc;
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ifp->if_name = DISCNAME;
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ifp->if_unit = unit;
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ifp->if_mtu = DSMTU;
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ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
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ifp->if_ioctl = discioctl;
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ifp->if_output = discoutput;
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ifp->if_type = IFT_LOOP;
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ifp->if_hdrlen = 0;
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ifp->if_addrlen = 0;
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ifp->if_snd.ifq_maxlen = 20;
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if_attach(ifp);
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bpfattach(ifp, DLT_NULL, sizeof(u_int));
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LIST_INSERT_HEAD(&disc_softc_list, sc, sc_list);
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return (0);
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}
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static void
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disc_clone_destroy(struct ifnet *ifp)
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{
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struct disc_softc *sc;
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sc = ifp->if_softc;
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LIST_REMOVE(sc, sc_list);
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bpfdetach(ifp);
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if_detach(ifp);
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free(sc, M_DISC);
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}
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static int
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disc_modevent(module_t mod, int type, void *data)
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{
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switch (type) {
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case MOD_LOAD:
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LIST_INIT(&disc_softc_list);
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if_clone_attach(&disc_cloner);
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break;
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case MOD_UNLOAD:
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if_clone_detach(&disc_cloner);
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while (!LIST_EMPTY(&disc_softc_list))
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disc_clone_destroy(
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&LIST_FIRST(&disc_softc_list)->sc_if);
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break;
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}
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return 0;
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}
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static moduledata_t disc_mod = {
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"if_disc",
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disc_modevent,
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NULL
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};
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DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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static int
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discoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
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struct rtentry *rt)
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{
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("discoutput no HDR");
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/* BPF write needs to be handled specially */
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if (dst->sa_family == AF_UNSPEC) {
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dst->sa_family = *(mtod(m, int *));
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m->m_len -= sizeof(int);
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m->m_pkthdr.len -= sizeof(int);
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m->m_data += sizeof(int);
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}
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if (ifp->if_bpf) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer a to it).
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*/
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struct mbuf m0;
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u_int af = dst->sa_family;
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m0.m_next = m;
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m0.m_len = 4;
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m0.m_data = (char *)⁡
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bpf_mtap(ifp, &m0);
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}
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m->m_pkthdr.rcvif = ifp;
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ifp->if_opackets++;
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ifp->if_obytes += m->m_pkthdr.len;
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m_freem(m);
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return 0;
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}
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/* ARGSUSED */
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static void
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discrtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
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{
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if (rt)
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rt->rt_rmx.rmx_mtu = DSMTU;
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}
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/*
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* Process an ioctl request.
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*/
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static int
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discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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struct ifaddr *ifa;
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struct ifreq *ifr = (struct ifreq *)data;
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int error = 0;
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switch (cmd) {
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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ifa = (struct ifaddr *)data;
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if (ifa != 0)
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ifa->ifa_rtrequest = discrtrequest;
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/*
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* Everything else is done at a higher level.
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*/
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break;
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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if (ifr == 0) {
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error = EAFNOSUPPORT; /* XXX */
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break;
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}
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switch (ifr->ifr_addr.sa_family) {
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#ifdef INET
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case AF_INET:
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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break;
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#endif
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default:
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error = EAFNOSUPPORT;
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break;
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}
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break;
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case SIOCSIFMTU:
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ifp->if_mtu = ifr->ifr_mtu;
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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