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Annotation of kernel/bsd/net/raw_usrreq.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) 1980, 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:  *     @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
        !            59:  */
        !            60: 
        !            61: #include <sys/param.h>
        !            62: #include <sys/mbuf.h>
        !            63: #include <sys/domain.h>
        !            64: #include <sys/protosw.h>
        !            65: #include <sys/socket.h>
        !            66: #include <sys/socketvar.h>
        !            67: #include <sys/errno.h>
        !            68: 
        !            69: #include <net/if.h>
        !            70: #include <net/route.h>
        !            71: #include <net/netisr.h>
        !            72: #include <net/raw_cb.h>
        !            73: 
        !            74: struct rawcb rawcb;                    /* head of list */
        !            75: 
        !            76: /*
        !            77:  * Initialize raw connection block q.
        !            78:  */
        !            79: void
        !            80: raw_init()
        !            81: {
        !            82: 
        !            83:        rawcb.rcb_next = rawcb.rcb_prev = &rawcb;
        !            84: }
        !            85: 
        !            86: 
        !            87: /*
        !            88:  * Raw protocol input routine.  Find the socket
        !            89:  * associated with the packet(s) and move them over.  If
        !            90:  * nothing exists for this packet, drop it.
        !            91:  */
        !            92: /*
        !            93:  * Raw protocol interface.
        !            94:  */
        !            95: void
        !            96: raw_input(m0, proto, src, dst)
        !            97:        struct mbuf *m0;
        !            98:        register struct sockproto *proto;
        !            99:        struct sockaddr *src, *dst;
        !           100: {
        !           101:        register struct rawcb *rp;
        !           102:        register struct mbuf *m = m0;
        !           103:        register int sockets = 0;
        !           104:        struct socket *last;
        !           105:        extern int bcmp(const void *, const void *, size_t);
        !           106: 
        !           107:        last = 0;
        !           108:        for (rp = rawcb.rcb_next; rp != &rawcb; rp = rp->rcb_next) {
        !           109:                if (rp->rcb_proto.sp_family != proto->sp_family)
        !           110:                        continue;
        !           111:                if (rp->rcb_proto.sp_protocol  &&
        !           112:                    rp->rcb_proto.sp_protocol != proto->sp_protocol)
        !           113:                        continue;
        !           114:                /*
        !           115:                 * We assume the lower level routines have
        !           116:                 * placed the address in a canonical format
        !           117:                 * suitable for a structure comparison.
        !           118:                 *
        !           119:                 * Note that if the lengths are not the same
        !           120:                 * the comparison will fail at the first byte.
        !           121:                 */
        !           122: #define        equal(a1, a2) \
        !           123:   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
        !           124:                if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
        !           125:                        continue;
        !           126:                if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
        !           127:                        continue;
        !           128:                if (last) {
        !           129:                        struct mbuf *n;
        !           130:                        if ((n = m_copy(m, 0, (int)M_COPYALL))) {
        !           131:                                if (sbappendaddr(&last->so_rcv, src,
        !           132:                                    n, (struct mbuf *)0) == 0)
        !           133:                                        /* should notify about lost packet */
        !           134:                                        m_freem(n);
        !           135:                                else {
        !           136:                                        sorwakeup(last);
        !           137:                                        sockets++;
        !           138:                                }
        !           139:                        }
        !           140:                }
        !           141:                last = rp->rcb_socket;
        !           142:        }
        !           143:        if (last) {
        !           144:                if (sbappendaddr(&last->so_rcv, src,
        !           145:                    m, (struct mbuf *)0) == 0)
        !           146:                        m_freem(m);
        !           147:                else {
        !           148:                        sorwakeup(last);
        !           149:                        sockets++;
        !           150:                }
        !           151:        } else
        !           152:                m_freem(m);
        !           153: }
        !           154: 
        !           155: /*ARGSUSED*/
        !           156: void
        !           157: raw_ctlinput(cmd, arg)
        !           158:        int cmd;
        !           159:        struct sockaddr *arg;
        !           160: {
        !           161: 
        !           162:        if (cmd < 0 || cmd > PRC_NCMDS)
        !           163:                return;
        !           164:        /* INCOMPLETE */
        !           165: }
        !           166: 
        !           167: /*ARGSUSED*/
        !           168: int
        !           169: raw_usrreq(so, req, m, nam, control)
        !           170:        struct socket *so;
        !           171:        int req;
        !           172:        struct mbuf *m, *nam, *control;
        !           173: {
        !           174:        register struct rawcb *rp = sotorawcb(so);
        !           175:        register int error = 0;
        !           176:        int len;
        !           177:        extern void bcopy(const void *, void *, unsigned long);
        !           178:        extern void panic(const char *fmt, ...);
        !           179: 
        !           180:        if (req == PRU_CONTROL)
        !           181:                return (EOPNOTSUPP);
        !           182:        if (control && control->m_len) {
        !           183:                error = EOPNOTSUPP;
        !           184:                goto release;
        !           185:        }
        !           186:        if (rp == 0) {
        !           187:                error = EINVAL;
        !           188:                goto release;
        !           189:        }
        !           190:        switch (req) {
        !           191: 
        !           192:        /*
        !           193:         * Allocate a raw control block and fill in the
        !           194:         * necessary info to allow packets to be routed to
        !           195:         * the appropriate raw interface routine.
        !           196:         */
        !           197:        case PRU_ATTACH:
        !           198:                if ((so->so_state & SS_PRIV) == 0) {
        !           199:                        error = EACCES;
        !           200:                        break;
        !           201:                }
        !           202:                error = raw_attach(so, (int)nam);
        !           203:                break;
        !           204: 
        !           205:        /*
        !           206:         * Destroy state just before socket deallocation.
        !           207:         * Flush data or not depending on the options.
        !           208:         */
        !           209:        case PRU_DETACH:
        !           210:                if (rp == 0) {
        !           211:                        error = ENOTCONN;
        !           212:                        break;
        !           213:                }
        !           214:                raw_detach(rp);
        !           215:                break;
        !           216: 
        !           217: #ifdef notdef
        !           218:        /*
        !           219:         * If a socket isn't bound to a single address,
        !           220:         * the raw input routine will hand it anything
        !           221:         * within that protocol family (assuming there's
        !           222:         * nothing else around it should go to). 
        !           223:         */
        !           224:        case PRU_CONNECT:
        !           225:                if (rp->rcb_faddr) {
        !           226:                        error = EISCONN;
        !           227:                        break;
        !           228:                }
        !           229:                nam = m_copym(nam, 0, M_COPYALL, M_WAIT);
        !           230:                rp->rcb_faddr = mtod(nam, struct sockaddr *);
        !           231:                soisconnected(so);
        !           232:                break;
        !           233: 
        !           234:        case PRU_BIND:
        !           235:                if (rp->rcb_laddr) {
        !           236:                        error = EINVAL;                 /* XXX */
        !           237:                        break;
        !           238:                }
        !           239:                error = raw_bind(so, nam);
        !           240:                break;
        !           241: #endif
        !           242: 
        !           243:        case PRU_CONNECT2:
        !           244:                error = EOPNOTSUPP;
        !           245:                goto release;
        !           246: 
        !           247:        case PRU_DISCONNECT:
        !           248:                if (rp->rcb_faddr == 0) {
        !           249:                        error = ENOTCONN;
        !           250:                        break;
        !           251:                }
        !           252:                raw_disconnect(rp);
        !           253:                soisdisconnected(so);
        !           254:                break;
        !           255: 
        !           256:        /*
        !           257:         * Mark the connection as being incapable of further input.
        !           258:         */
        !           259:        case PRU_SHUTDOWN:
        !           260:                socantsendmore(so);
        !           261:                break;
        !           262: 
        !           263:        /*
        !           264:         * Ship a packet out.  The appropriate raw output
        !           265:         * routine handles any massaging necessary.
        !           266:         */
        !           267:        case PRU_SEND:
        !           268:                if (nam) {
        !           269:                        if (rp->rcb_faddr) {
        !           270:                                error = EISCONN;
        !           271:                                break;
        !           272:                        }
        !           273:                        rp->rcb_faddr = mtod(nam, struct sockaddr *);
        !           274:                } else if (rp->rcb_faddr == 0) {
        !           275:                        error = ENOTCONN;
        !           276:                        break;
        !           277:                }
        !           278:                error = (*so->so_proto->pr_output)(m, so);
        !           279:                m = NULL;
        !           280:                if (nam)
        !           281:                        rp->rcb_faddr = 0;
        !           282:                break;
        !           283: 
        !           284:        case PRU_ABORT:
        !           285:                raw_disconnect(rp);
        !           286:                sofree(so);
        !           287:                soisdisconnected(so);
        !           288:                break;
        !           289: 
        !           290:        case PRU_SENSE:
        !           291:                /*
        !           292:                 * stat: don't bother with a blocksize.
        !           293:                 */
        !           294:                return (0);
        !           295: 
        !           296:        /*
        !           297:         * Not supported.
        !           298:         */
        !           299:        case PRU_RCVOOB:
        !           300:        case PRU_RCVD:
        !           301:                return(EOPNOTSUPP);
        !           302: 
        !           303:        case PRU_LISTEN:
        !           304:        case PRU_ACCEPT:
        !           305:        case PRU_SENDOOB:
        !           306:                error = EOPNOTSUPP;
        !           307:                break;
        !           308: 
        !           309:        case PRU_SOCKADDR:
        !           310:                if (rp->rcb_laddr == 0) {
        !           311:                        error = EINVAL;
        !           312:                        break;
        !           313:                }
        !           314:                len = rp->rcb_laddr->sa_len;
        !           315:                bcopy((caddr_t)rp->rcb_laddr, mtod(nam, caddr_t), (unsigned)len);
        !           316:                nam->m_len = len;
        !           317:                break;
        !           318: 
        !           319:        case PRU_PEERADDR:
        !           320:                if (rp->rcb_faddr == 0) {
        !           321:                        error = ENOTCONN;
        !           322:                        break;
        !           323:                }
        !           324:                len = rp->rcb_faddr->sa_len;
        !           325:                bcopy((caddr_t)rp->rcb_faddr, mtod(nam, caddr_t), (unsigned)len);
        !           326:                nam->m_len = len;
        !           327:                break;
        !           328: 
        !           329:        default:
        !           330:                panic("raw_usrreq");
        !           331:        }
        !           332: release:
        !           333:        if (m != NULL)
        !           334:                m_freem(m);
        !           335:        return (error);
        !           336: }

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