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Annotation of XNU/bsd/net/if_disc.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1982, 1986, 1993
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     From: @(#)if_loop.c     8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: /*
        !            58:  * Discard interface driver for protocol testing and timing.
        !            59:  * (Based on the loopback.)
        !            60:  */
        !            61: 
        !            62: #include <sys/param.h>
        !            63: #include <sys/systm.h>
        !            64: #include <sys/kernel.h>
        !            65: #include <sys/mbuf.h>
        !            66: #include <sys/socket.h>
        !            67: #include <sys/sockio.h>
        !            68: 
        !            69: #include <net/if.h>
        !            70: #include <net/if_types.h>
        !            71: #include <net/route.h>
        !            72: #include <net/bpf.h>
        !            73: 
        !            74: #include "bpfilter.h"
        !            75: #include "opt_inet.h"
        !            76: 
        !            77: #if TINY_DSMTU
        !            78: #define        DSMTU   (1024+512)
        !            79: #else
        !            80: #define DSMTU  65532
        !            81: #endif
        !            82: 
        !            83: static void discattach __P((void *dummy));
        !            84: PSEUDO_SET(discattach, if_disc);
        !            85: 
        !            86: static struct  ifnet discif;
        !            87: static int discoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
        !            88:                    struct rtentry *);
        !            89: static void discrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa);
        !            90: static int discioctl(struct ifnet *, u_long, caddr_t);
        !            91: 
        !            92: /* ARGSUSED */
        !            93: static void
        !            94: discattach(dummy)
        !            95:        void *dummy;
        !            96: {
        !            97:        register struct ifnet *ifp = &discif;
        !            98: 
        !            99:        ifp->if_name = "ds";
        !           100:        ifp->if_family = APPLE_IF_FAM_DISC;
        !           101:        ifp->if_mtu = DSMTU;
        !           102:        ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
        !           103:        ifp->if_ioctl = discioctl;
        !           104:        ifp->if_output = discoutput;
        !           105:        ifp->if_type = IFT_LOOP;
        !           106:        ifp->if_hdrlen = 0;
        !           107:        ifp->if_addrlen = 0;
        !           108:        if_attach(ifp);
        !           109: #if NBPFILTER > 0
        !           110:        bpfattach(ifp, DLT_NULL, sizeof(u_int));
        !           111: #endif
        !           112: }
        !           113: 
        !           114: static int
        !           115: discoutput(ifp, m, dst, rt)
        !           116:        struct ifnet *ifp;
        !           117:        register struct mbuf *m;
        !           118:        struct sockaddr *dst;
        !           119:        register struct rtentry *rt;
        !           120: {
        !           121:        if ((m->m_flags & M_PKTHDR) == 0)
        !           122:                panic("discoutput no HDR");
        !           123: #if NBPFILTER > 0
        !           124:        /* BPF write needs to be handled specially */
        !           125:        if (dst->sa_family == AF_UNSPEC) {
        !           126:                dst->sa_family = *(mtod(m, int *));
        !           127:                m->m_len -= sizeof(int);
        !           128:                m->m_pkthdr.len -= sizeof(int);
        !           129:                m->m_data += sizeof(int);
        !           130:        }
        !           131: 
        !           132:        if (discif.if_bpf) {
        !           133:                /*
        !           134:                 * We need to prepend the address family as
        !           135:                 * a four byte field.  Cons up a dummy header
        !           136:                 * to pacify bpf.  This is safe because bpf
        !           137:                 * will only read from the mbuf (i.e., it won't
        !           138:                 * try to free it or keep a pointer a to it).
        !           139:                 */
        !           140:                struct mbuf m0;
        !           141:                u_int af = dst->sa_family;
        !           142: 
        !           143:                m0.m_next = m;
        !           144:                m0.m_len = 4;
        !           145:                m0.m_data = (char *)&af;
        !           146: 
        !           147:                bpf_mtap(&discif, &m0);
        !           148:        }
        !           149: #endif
        !           150:        m->m_pkthdr.rcvif = ifp;
        !           151: 
        !           152:        ifp->if_opackets++;
        !           153:        ifp->if_obytes += m->m_pkthdr.len;
        !           154: 
        !           155:        m_freem(m);
        !           156:        return 0;
        !           157: }
        !           158: 
        !           159: /* ARGSUSED */
        !           160: static void
        !           161: discrtrequest(cmd, rt, sa)
        !           162:        int cmd;
        !           163:        struct rtentry *rt;
        !           164:        struct sockaddr *sa;
        !           165: {
        !           166:        if (rt)
        !           167:                rt->rt_rmx.rmx_mtu = DSMTU;
        !           168: }
        !           169: 
        !           170: /*
        !           171:  * Process an ioctl request.
        !           172:  */
        !           173: /* ARGSUSED */
        !           174: static int
        !           175: discioctl(ifp, cmd, data)
        !           176:        register struct ifnet *ifp;
        !           177:        u_long cmd;
        !           178:        caddr_t data;
        !           179: {
        !           180:        register struct ifaddr *ifa;
        !           181:        register struct ifreq *ifr = (struct ifreq *)data;
        !           182:        register int error = 0;
        !           183: 
        !           184:        switch (cmd) {
        !           185: 
        !           186:        case SIOCSIFADDR:
        !           187:                ifp->if_flags |= IFF_UP;
        !           188:                ifa = (struct ifaddr *)data;
        !           189:                if (ifa != 0)
        !           190:                        ifa->ifa_rtrequest = discrtrequest;
        !           191:                /*
        !           192:                 * Everything else is done at a higher level.
        !           193:                 */
        !           194:                break;
        !           195: 
        !           196:        case SIOCADDMULTI:
        !           197:        case SIOCDELMULTI:
        !           198:                if (ifr == 0) {
        !           199:                        error = EAFNOSUPPORT;           /* XXX */
        !           200:                        break;
        !           201:                }
        !           202:                switch (ifr->ifr_addr.sa_family) {
        !           203: 
        !           204: #if INET
        !           205:                case AF_INET:
        !           206:                        break;
        !           207: #endif
        !           208: 
        !           209:                default:
        !           210:                        error = EAFNOSUPPORT;
        !           211:                        break;
        !           212:                }
        !           213:                break;
        !           214: 
        !           215:        case SIOCSIFMTU:
        !           216:                ifp->if_mtu = ifr->ifr_mtu;
        !           217:                break;
        !           218: 
        !           219:        default:
        !           220:                error = EINVAL;
        !           221:        }
        !           222:        return (error);
        !           223: }

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