Return to if_loop.c CVS log

Up to [Apple Darwin 0.x] / kernel / bsd / net

Annotation of kernel/bsd/net/if_loop.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1982, 1986, 1993
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the University of
        !            41:  *     California, Berkeley and its contributors.
        !            42:  * 4. Neither the name of the University nor the names of its contributors
        !            43:  *    may be used to endorse or promote products derived from this software
        !            44:  *    without specific prior written permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  *
        !            58:  *     @(#)if_loop.c   8.2 (Berkeley) 1/9/95
        !            59:  */
        !            60: 
        !            61: /*
        !            62:  * Loopback interface driver for protocol testing and timing.
        !            63:  */
        !            64: 
        !            65: #include "bpfilter.h"
        !            66: #include "loop.h"
        !            67: 
        !            68: #include <sys/param.h>
        !            69: #include <sys/systm.h>
        !            70: #include <sys/kernel.h>
        !            71: #include <sys/mbuf.h>
        !            72: #include <sys/socket.h>
        !            73: #include <sys/errno.h>
        !            74: #include <sys/ioctl.h>
        !            75: #include <sys/time.h>
        !            76: 
        !            77: #include <machine/cpu.h>
        !            78: 
        !            79: #include <net/if.h>
        !            80: #include <net/if_types.h>
        !            81: #include <net/netisr.h>
        !            82: #include <net/route.h>
        !            83: #include <net/bpf.h>
        !            84: 
        !            85: #if    INET
        !            86: #include <netinet/in.h>
        !            87: #include <netinet/in_systm.h>
        !            88: #include <netinet/in_var.h>
        !            89: #include <netinet/ip.h>
        !            90: #endif
        !            91: 
        !            92: #if NS
        !            93: #include <netns/ns.h>
        !            94: #include <netns/ns_if.h>
        !            95: #endif
        !            96: 
        !            97: #if ISO
        !            98: #include <netiso/iso.h>
        !            99: #include <netiso/iso_var.h>
        !           100: #endif
        !           101: 
        !           102: #if NBPFILTER > 0
        !           103: #include <net/bpf.h>
        !           104: #endif
        !           105: 
        !           106: #define        LOMTU   (32768)
        !           107: 
        !           108: struct ifnet loif;
        !           109: 
        !           110: /* Should be in spl.h */
        !           111: int splimp(void);
        !           112: int splnet(void);
        !           113: int splx(int);
        !           114: 
        !           115: void
        !           116: loopattach(n)
        !           117:        int n;
        !           118: {
        !           119:        register struct ifnet *ifp = &loif;
        !           120: 
        !           121: #ifdef lint
        !           122:        n = n;                  /* Highlander: there can only be one... */
        !           123: #endif
        !           124:        ifp->if_name = "lo";
        !           125:        ifp->if_mtu = LOMTU;
        !           126:        ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
        !           127:        ifp->if_ioctl = loioctl;
        !           128:        ifp->if_output = looutput;
        !           129:        ifp->if_type = IFT_LOOP;
        !           130:        ifp->if_hdrlen = 0;
        !           131:        ifp->if_addrlen = 0;
        !           132:        if_attach(ifp);
        !           133: #if NBPFILTER > 0
        !           134:        bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
        !           135: #endif
        !           136: }
        !           137: 
        !           138: int
        !           139: looutput(ifp, m, dst, rt)
        !           140:        struct ifnet *ifp;
        !           141:        register struct mbuf *m;
        !           142:        struct sockaddr *dst;
        !           143:        register struct rtentry *rt;
        !           144: {
        !           145:        int s, isr;
        !           146:        register struct ifqueue *ifq = 0;
        !           147: 
        !           148:        if ((m->m_flags & M_PKTHDR) == 0)
        !           149:                panic("looutput no HDR");
        !           150:        ifp->if_lastchange = time;
        !           151: #if NBPFILTER > 0
        !           152:        if (loif.if_bpf) {
        !           153:                /*
        !           154:                 * We need to prepend the address family as
        !           155:                 * a four byte field.  Cons up a dummy header
        !           156:                 * to pacify bpf.  This is safe because bpf
        !           157:                 * will only read from the mbuf (i.e., it won't
        !           158:                 * try to free it or keep a pointer to it).
        !           159:                 */
        !           160:                struct mbuf m0;
        !           161:                u_int af = dst->sa_family;
        !           162: 
        !           163:                m0.m_next = m;
        !           164:                m0.m_len = 4;
        !           165:                m0.m_data = (char *)&af;
        !           166:                
        !           167:                BPF_MTAP(loif.if_bpf, &m0);
        !           168:        }
        !           169: #endif
        !           170:        m->m_pkthdr.rcvif = ifp;
        !           171: 
        !           172:        if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
        !           173:                m_freem(m);
        !           174:                return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
        !           175:                        rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
        !           176:        }
        !           177:        ifp->if_opackets++;
        !           178:        ifp->if_obytes += m->m_pkthdr.len;
        !           179:        switch (dst->sa_family) {
        !           180: 
        !           181: #if INET
        !           182:        case AF_INET:
        !           183:                ifq = &ipintrq;
        !           184:                isr = NETISR_IP;
        !           185:                break;
        !           186: #endif
        !           187: #if NS
        !           188:        case AF_NS:
        !           189:                ifq = &nsintrq;
        !           190:                isr = NETISR_NS;
        !           191:                break;
        !           192: #endif
        !           193: #if ISO
        !           194:        case AF_ISO:
        !           195:                ifq = &clnlintrq;
        !           196:                isr = NETISR_ISO;
        !           197:                break;
        !           198: #endif
        !           199:        default:
        !           200:                printf("lo%d: can't handle af%d\n", ifp->if_unit,
        !           201:                        dst->sa_family);
        !           202:                m_freem(m);
        !           203:                return (EAFNOSUPPORT);
        !           204:        }
        !           205:        s = splimp();
        !           206:        if (IF_QFULL(ifq)) {
        !           207:                IF_DROP(ifq);
        !           208:                m_freem(m);
        !           209:                splx(s);
        !           210:                return (ENOBUFS);
        !           211:        }
        !           212:        IF_ENQUEUE(ifq, m);
        !           213:        schednetisr(isr);
        !           214:        ifp->if_ipackets++;
        !           215:        ifp->if_ibytes += m->m_pkthdr.len;
        !           216:        splx(s);
        !           217:        return (0);
        !           218: }
        !           219: 
        !           220: /* ARGSUSED */
        !           221: void
        !           222: lortrequest(cmd, rt, sa)
        !           223:        int cmd;
        !           224:        struct rtentry *rt;
        !           225:        struct sockaddr *sa;
        !           226: {
        !           227: 
        !           228:        if (rt)
        !           229:                rt->rt_rmx.rmx_mtu = LOMTU;
        !           230: }
        !           231: 
        !           232: /*
        !           233:  * Process an ioctl request.
        !           234:  */
        !           235: /* ARGSUSED */
        !           236: int
        !           237: loioctl(ifp, cmd, data)
        !           238:        register struct ifnet *ifp;
        !           239:        u_long cmd;
        !           240:        caddr_t data;
        !           241: {
        !           242:        register struct ifaddr *ifa;
        !           243:        register struct ifreq *ifr;
        !           244:        register int error = 0;
        !           245: 
        !           246:        switch (cmd) {
        !           247: 
        !           248:        case SIOCSIFADDR:
        !           249:                ifp->if_flags |= IFF_UP;
        !           250:                ifa = (struct ifaddr *)data;
        !           251:                if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO)
        !           252:                        ifa->ifa_rtrequest = lortrequest;
        !           253:                /*
        !           254:                 * Everything else is done at a higher level.
        !           255:                 */
        !           256:                break;
        !           257: 
        !           258:        case SIOCADDMULTI:
        !           259:        case SIOCDELMULTI:
        !           260:                ifr = (struct ifreq *)data;
        !           261:                if (ifr == 0) {
        !           262:                        error = EAFNOSUPPORT;           /* XXX */
        !           263:                        break;
        !           264:                }
        !           265:                switch (ifr->ifr_addr.sa_family) {
        !           266: 
        !           267: #if INET
        !           268:                case AF_INET:
        !           269:                        break;
        !           270: #endif
        !           271: 
        !           272:                default:
        !           273:                        error = EAFNOSUPPORT;
        !           274:                        break;
        !           275:                }
        !           276:                break;
        !           277: 
        !           278:        default:
        !           279:                error = EINVAL;
        !           280:        }
        !           281:        return (error);
        !           282: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.