/* $OpenBSD: if_loop.c,v 1.35 2005/06/12 06:23:43 henning Exp $ */ /* $NetBSD: if_loop.c,v 1.15 1996/05/07 02:40:33 thorpej Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)if_loop.c 8.1 (Berkeley) 6/10/93 */ /* * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 * * NRL grants permission for redistribution and use in source and binary * forms, with or without modification, of the software and documentation * created at NRL provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgements: * This product includes software developed by the University of * California, Berkeley and its contributors. * This product includes software developed at the Information * Technology Division, US Naval Research Laboratory. * 4. Neither the name of the NRL nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * The views and conclusions contained in the software and documentation * are those of the authors and should not be interpreted as representing * official policies, either expressed or implied, of the US Naval * Research Laboratory (NRL). */ /* * Loopback interface driver for protocol testing and timing. */ #include "bpfilter.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #endif #ifdef INET6 #ifndef INET #include #endif #include #include #endif #ifdef IPX #include #include #endif #ifdef NETATALK #include #include #include #endif #if NBPFILTER > 0 #include #endif #if defined(LARGE_LOMTU) #define LOMTU (131072 + MHLEN + MLEN) #else #define LOMTU (32768 + MHLEN + MLEN) #endif #ifdef ALTQ static void lo_altqstart(struct ifnet *); #endif int loop_clone_create(struct if_clone *, int); int loop_clone_destroy(struct ifnet *); struct if_clone loop_cloner = IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy); /* ARGSUSED */ void loopattach(n) int n; { (void) loop_clone_create(&loop_cloner, 0); if_clone_attach(&loop_cloner); } int loop_clone_create(ifc, unit) struct if_clone *ifc; int unit; { struct ifnet *ifp; MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_DEVBUF, M_NOWAIT); if (ifp == NULL) return (ENOMEM); bzero(ifp, sizeof(struct ifnet)); snprintf(ifp->if_xname, sizeof ifp->if_xname, "lo%d", unit); ifp->if_softc = NULL; 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_hdrlen = sizeof(u_int32_t); ifp->if_addrlen = 0; IFQ_SET_READY(&ifp->if_snd); #ifdef ALTQ ifp->if_start = lo_altqstart; #endif if (unit == 0) { lo0ifp = ifp; if_attachhead(ifp); if_addgroup(lo0ifp, ifc->ifc_name); } else if_attach(ifp); if_alloc_sadl(ifp); #if NBPFILTER > 0 bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, sizeof(u_int32_t)); #endif return (0); } int loop_clone_destroy(ifp) struct ifnet *ifp; { if (ifp == lo0ifp) return (EPERM); #if NBPFILTER > 0 bpfdetach(ifp); #endif if_detach(ifp); free(ifp, M_DEVBUF); return (0); } int looutput(ifp, m, dst, rt) struct ifnet *ifp; struct mbuf *m; struct sockaddr *dst; struct rtentry *rt; { int s, isr; struct ifqueue *ifq = 0; if ((m->m_flags & M_PKTHDR) == 0) panic("looutput: no header mbuf"); #if NBPFILTER > 0 /* * only send packets to bpf if they are real loopback packets; * looutput() is also called for SIMPLEX interfaces to duplicate * packets for local use. But don't dup them to bpf. */ if (ifp->if_bpf && (ifp->if_flags&IFF_LOOPBACK)) { /* * We need to prepend the address family as * a four byte field. Cons up a dummy header * to pacify bpf. This is safe because bpf * will only read from the mbuf (i.e., it won't * try to free it or keep a pointer to it). */ struct mbuf m0; u_int32_t af = htonl(dst->sa_family); m0.m_flags = 0; m0.m_next = m; m0.m_len = sizeof(af); m0.m_data = (char *)⁡ bpf_mtap(ifp->if_bpf, &m0); } #endif m->m_pkthdr.rcvif = ifp; if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) { m_freem(m); return (rt->rt_flags & RTF_BLACKHOLE ? 0 : rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH); } ifp->if_opackets++; ifp->if_obytes += m->m_pkthdr.len; #ifdef ALTQ /* * altq for loop is just for debugging. * only used when called for loop interface (not for * a simplex interface). */ if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) && ifp->if_start == lo_altqstart) { int32_t *afp; int error; M_PREPEND(m, sizeof(int32_t), M_DONTWAIT); if (m == 0) return (ENOBUFS); afp = mtod(m, int32_t *); *afp = (int32_t)dst->sa_family; s = splimp(); IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error); (*ifp->if_start)(ifp); splx(s); return (error); } #endif /* ALTQ */ switch (dst->sa_family) { #ifdef INET case AF_INET: ifq = &ipintrq; isr = NETISR_IP; break; #endif #ifdef INET6 case AF_INET6: ifq = &ip6intrq; isr = NETISR_IPV6; break; #endif /* INET6 */ #ifdef IPX case AF_IPX: ifq = &ipxintrq; isr = NETISR_IPX; break; #endif #ifdef NETATALK case AF_APPLETALK: ifq = &atintrq2; isr = NETISR_ATALK; break; #endif /* NETATALK */ default: printf("%s: can't handle af%d\n", ifp->if_xname, dst->sa_family); m_freem(m); return (EAFNOSUPPORT); } s = splimp(); if (IF_QFULL(ifq)) { IF_DROP(ifq); m_freem(m); splx(s); return (ENOBUFS); } IF_ENQUEUE(ifq, m); schednetisr(isr); ifp->if_ipackets++; ifp->if_ibytes += m->m_pkthdr.len; splx(s); return (0); } #ifdef ALTQ static void lo_altqstart(ifp) struct ifnet *ifp; { struct ifqueue *ifq; struct mbuf *m; int32_t af, *afp; int s, isr; while (1) { s = splimp(); IFQ_DEQUEUE(&ifp->if_snd, m); splx(s); if (m == NULL) return; afp = mtod(m, int32_t *); af = *afp; m_adj(m, sizeof(int32_t)); switch (af) { #ifdef INET case AF_INET: ifq = &ipintrq; isr = NETISR_IP; break; #endif #ifdef INET6 case AF_INET6: m->m_flags |= M_LOOP; ifq = &ip6intrq; isr = NETISR_IPV6; break; #endif #ifdef IPX case AF_IPX: ifq = &ipxintrq; isr = NETISR_IPX; break; #endif #ifdef NETATALK case AF_APPLETALK: ifq = &atintrq2; isr = NETISR_ATALK; break; #endif /* NETATALK */ default: printf("lo_altqstart: can't handle af%d\n", af); m_freem(m); return; } s = splimp(); if (IF_QFULL(ifq)) { IF_DROP(ifq); m_freem(m); splx(s); return; } IF_ENQUEUE(ifq, m); schednetisr(isr); ifp->if_ipackets++; ifp->if_ibytes += m->m_pkthdr.len; splx(s); } } #endif /* ALTQ */ /* ARGSUSED */ void lortrequest(cmd, rt, info) int cmd; struct rtentry *rt; struct rt_addrinfo *info; { if (rt) rt->rt_rmx.rmx_mtu = LOMTU; } /* * Process an ioctl request. */ /* ARGSUSED */ int loioctl(ifp, cmd, data) struct ifnet *ifp; u_long cmd; caddr_t data; { struct ifaddr *ifa; struct ifreq *ifr; int error = 0; switch (cmd) { case SIOCSIFADDR: ifp->if_flags |= IFF_UP | IFF_RUNNING; ifa = (struct ifaddr *)data; if (ifa != 0) ifa->ifa_rtrequest = lortrequest; /* * Everything else is done at a higher level. */ break; case SIOCADDMULTI: case SIOCDELMULTI: ifr = (struct ifreq *)data; if (ifr == 0) { error = EAFNOSUPPORT; /* XXX */ break; } switch (ifr->ifr_addr.sa_family) { #ifdef INET case AF_INET: break; #endif #ifdef INET6 case AF_INET6: break; #endif /* INET6 */ default: error = EAFNOSUPPORT; break; } break; case SIOCSIFMTU: ifr = (struct ifreq *)data; ifp->if_mtu = ifr->ifr_mtu; break; default: error = EINVAL; } return (error); }