f889d2ef8d
- Split the code out into if_clone.[ch]. - Locked struct if_clone. [1] - Add a per-cloner match function rather then simply matching names of the form <name><unit> and <name>. - Use the match function to allow creation of <interface>.<tag> vlan interfaces. The old way is preserved unchanged! - Also the match function to allow creation of stf(4) interfaces named stf0, stf, or 6to4. This is the only major user visible change in that "ifconfig stf" creates the interface stf rather then stf0 and does not print "stf0" to stdout. - Allow destroy functions to fail so they can refuse to delete interfaces. Currently, we forbid the deletion of interfaces which were created in the init function, particularly lo0, pflog0, and pfsync0. In the case of lo0 this was a panic implementation so it does not count as a user visiable change. :-) - Since most interfaces do not need the new functionality, an family of wrapper functions, ifc_simple_*(), were created to wrap old style cloner functions. - The IF_CLONE_INITIALIZER macro is replaced with a new incompatible IFC_CLONE_INITIALIZER and ifc_simple consumers use IFC_SIMPLE_DECLARE instead. Submitted by: Maurycy Pawlowski-Wieronski <maurycy at fouk.org> [1] Reviewed by: andre, mlaier Discussed on: net
261 lines
5.9 KiB
C
261 lines
5.9 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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* 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_clone.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 struct mtx disc_mtx;
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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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IFC_SIMPLE_DECLARE(disc, 0);
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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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if_initname(ifp, ifc->ifc_name, 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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mtx_lock(&disc_mtx);
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LIST_INSERT_HEAD(&disc_softc_list, sc, sc_list);
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mtx_unlock(&disc_mtx);
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return (0);
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}
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static void
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disc_destroy(struct disc_softc *sc)
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{
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bpfdetach(&sc->sc_if);
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if_detach(&sc->sc_if);
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free(sc, M_DISC);
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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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mtx_lock(&disc_mtx);
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LIST_REMOVE(sc, sc_list);
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mtx_unlock(&disc_mtx);
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disc_destroy(sc);
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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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struct disc_softc *sc;
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switch (type) {
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case MOD_LOAD:
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mtx_init(&disc_mtx, "disc_mtx", NULL, MTX_DEF);
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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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mtx_lock(&disc_mtx);
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while ((sc = LIST_FIRST(&disc_softc_list)) != NULL) {
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LIST_REMOVE(sc, sc_list);
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mtx_unlock(&disc_mtx);
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disc_destroy(sc);
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mtx_lock(&disc_mtx);
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}
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mtx_unlock(&disc_mtx);
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mtx_destroy(&disc_mtx);
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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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M_ASSERTPKTHDR(m);
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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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u_int af = dst->sa_family;
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bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
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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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RT_LOCK_ASSERT(rt);
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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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