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Annotation of Net2/net/raw_usrreq.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 1986 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)raw_usrreq.c        7.9 (Berkeley) 6/28/90
        !            34:  */
        !            35: 
        !            36: #include "param.h"
        !            37: #include "mbuf.h"
        !            38: #include "domain.h"
        !            39: #include "protosw.h"
        !            40: #include "socket.h"
        !            41: #include "socketvar.h"
        !            42: #include "errno.h"
        !            43: 
        !            44: #include "if.h"
        !            45: #include "route.h"
        !            46: #include "netisr.h"
        !            47: #include "raw_cb.h"
        !            48: 
        !            49: #include "machine/mtpr.h"
        !            50: 
        !            51: /*
        !            52:  * Initialize raw connection block q.
        !            53:  */
        !            54: raw_init()
        !            55: {
        !            56: 
        !            57:        rawcb.rcb_next = rawcb.rcb_prev = &rawcb;
        !            58:        rawintrq.ifq_maxlen = IFQ_MAXLEN;
        !            59: }
        !            60: 
        !            61: 
        !            62: /*
        !            63:  * Raw protocol input routine.  Find the socket
        !            64:  * associated with the packet(s) and move them over.  If
        !            65:  * nothing exists for this packet, drop it.
        !            66:  */
        !            67: /*
        !            68:  * Raw protocol interface.
        !            69:  */
        !            70: raw_input(m0, proto, src, dst)
        !            71:        struct mbuf *m0;
        !            72:        register struct sockproto *proto;
        !            73:        struct sockaddr *src, *dst;
        !            74: {
        !            75:        register struct rawcb *rp;
        !            76:        register struct mbuf *m = m0;
        !            77:        register int sockets = 0;
        !            78:        struct socket *last;
        !            79: 
        !            80:        last = 0;
        !            81:        for (rp = rawcb.rcb_next; rp != &rawcb; rp = rp->rcb_next) {
        !            82:                if (rp->rcb_proto.sp_family != proto->sp_family)
        !            83:                        continue;
        !            84:                if (rp->rcb_proto.sp_protocol  &&
        !            85:                    rp->rcb_proto.sp_protocol != proto->sp_protocol)
        !            86:                        continue;
        !            87:                /*
        !            88:                 * We assume the lower level routines have
        !            89:                 * placed the address in a canonical format
        !            90:                 * suitable for a structure comparison.
        !            91:                 *
        !            92:                 * Note that if the lengths are not the same
        !            93:                 * the comparison will fail at the first byte.
        !            94:                 */
        !            95: #define        equal(a1, a2) \
        !            96:   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
        !            97:                if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
        !            98:                        continue;
        !            99:                if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
        !           100:                        continue;
        !           101:                if (last) {
        !           102:                        struct mbuf *n;
        !           103:                        if (n = m_copy(m, 0, (int)M_COPYALL)) {
        !           104:                                if (sbappendaddr(&last->so_rcv, src,
        !           105:                                    n, (struct mbuf *)0) == 0)
        !           106:                                        /* should notify about lost packet */
        !           107:                                        m_freem(n);
        !           108:                                else {
        !           109:                                        sorwakeup(last);
        !           110:                                        sockets++;
        !           111:                                }
        !           112:                        }
        !           113:                }
        !           114:                last = rp->rcb_socket;
        !           115:        }
        !           116:        if (last) {
        !           117:                if (sbappendaddr(&last->so_rcv, src,
        !           118:                    m, (struct mbuf *)0) == 0)
        !           119:                        m_freem(m);
        !           120:                else {
        !           121:                        sorwakeup(last);
        !           122:                        sockets++;
        !           123:                }
        !           124:        } else
        !           125:                m_freem(m);
        !           126:        return (sockets);
        !           127: }
        !           128: 
        !           129: /*ARGSUSED*/
        !           130: raw_ctlinput(cmd, arg)
        !           131:        int cmd;
        !           132:        struct sockaddr *arg;
        !           133: {
        !           134: 
        !           135:        if (cmd < 0 || cmd > PRC_NCMDS)
        !           136:                return;
        !           137:        /* INCOMPLETE */
        !           138: }
        !           139: 
        !           140: /*ARGSUSED*/
        !           141: raw_usrreq(so, req, m, nam, control)
        !           142:        struct socket *so;
        !           143:        int req;
        !           144:        struct mbuf *m, *nam, *control;
        !           145: {
        !           146:        register struct rawcb *rp = sotorawcb(so);
        !           147:        register int error = 0;
        !           148:        int len;
        !           149: 
        !           150:        if (req == PRU_CONTROL)
        !           151:                return (EOPNOTSUPP);
        !           152:        if (control && control->m_len) {
        !           153:                error = EOPNOTSUPP;
        !           154:                goto release;
        !           155:        }
        !           156:        if (rp == 0) {
        !           157:                error = EINVAL;
        !           158:                goto release;
        !           159:        }
        !           160:        switch (req) {
        !           161: 
        !           162:        /*
        !           163:         * Allocate a raw control block and fill in the
        !           164:         * necessary info to allow packets to be routed to
        !           165:         * the appropriate raw interface routine.
        !           166:         */
        !           167:        case PRU_ATTACH:
        !           168:                if ((so->so_state & SS_PRIV) == 0) {
        !           169:                        error = EACCES;
        !           170:                        break;
        !           171:                }
        !           172:                error = raw_attach(so, (int)nam);
        !           173:                break;
        !           174: 
        !           175:        /*
        !           176:         * Destroy state just before socket deallocation.
        !           177:         * Flush data or not depending on the options.
        !           178:         */
        !           179:        case PRU_DETACH:
        !           180:                if (rp == 0) {
        !           181:                        error = ENOTCONN;
        !           182:                        break;
        !           183:                }
        !           184:                raw_detach(rp);
        !           185:                break;
        !           186: 
        !           187: #ifdef notdef
        !           188:        /*
        !           189:         * If a socket isn't bound to a single address,
        !           190:         * the raw input routine will hand it anything
        !           191:         * within that protocol family (assuming there's
        !           192:         * nothing else around it should go to). 
        !           193:         */
        !           194:        case PRU_CONNECT:
        !           195:                if (rp->rcb_faddr) {
        !           196:                        error = EISCONN;
        !           197:                        break;
        !           198:                }
        !           199:                nam = m_copym(nam, 0, M_COPYALL, M_WAIT);
        !           200:                rp->rcb_faddr = mtod(nam, struct sockaddr *);
        !           201:                soisconnected(so);
        !           202:                break;
        !           203: 
        !           204:        case PRU_BIND:
        !           205:                if (rp->rcb_laddr) {
        !           206:                        error = EINVAL;                 /* XXX */
        !           207:                        break;
        !           208:                }
        !           209:                error = raw_bind(so, nam);
        !           210:                break;
        !           211: #endif
        !           212: 
        !           213:        case PRU_CONNECT2:
        !           214:                error = EOPNOTSUPP;
        !           215:                goto release;
        !           216: 
        !           217:        case PRU_DISCONNECT:
        !           218:                if (rp->rcb_faddr == 0) {
        !           219:                        error = ENOTCONN;
        !           220:                        break;
        !           221:                }
        !           222:                raw_disconnect(rp);
        !           223:                soisdisconnected(so);
        !           224:                break;
        !           225: 
        !           226:        /*
        !           227:         * Mark the connection as being incapable of further input.
        !           228:         */
        !           229:        case PRU_SHUTDOWN:
        !           230:                socantsendmore(so);
        !           231:                break;
        !           232: 
        !           233:        /*
        !           234:         * Ship a packet out.  The appropriate raw output
        !           235:         * routine handles any massaging necessary.
        !           236:         */
        !           237:        case PRU_SEND:
        !           238:                if (nam) {
        !           239:                        if (rp->rcb_faddr) {
        !           240:                                error = EISCONN;
        !           241:                                break;
        !           242:                        }
        !           243:                        rp->rcb_faddr = mtod(nam, struct sockaddr *);
        !           244:                } else if (rp->rcb_faddr == 0) {
        !           245:                        error = ENOTCONN;
        !           246:                        break;
        !           247:                }
        !           248:                error = (*so->so_proto->pr_output)(m, so);
        !           249:                m = NULL;
        !           250:                if (nam)
        !           251:                        rp->rcb_faddr = 0;
        !           252:                break;
        !           253: 
        !           254:        case PRU_ABORT:
        !           255:                raw_disconnect(rp);
        !           256:                sofree(so);
        !           257:                soisdisconnected(so);
        !           258:                break;
        !           259: 
        !           260:        case PRU_SENSE:
        !           261:                /*
        !           262:                 * stat: don't bother with a blocksize.
        !           263:                 */
        !           264:                return (0);
        !           265: 
        !           266:        /*
        !           267:         * Not supported.
        !           268:         */
        !           269:        case PRU_RCVOOB:
        !           270:        case PRU_RCVD:
        !           271:                return(EOPNOTSUPP);
        !           272: 
        !           273:        case PRU_LISTEN:
        !           274:        case PRU_ACCEPT:
        !           275:        case PRU_SENDOOB:
        !           276:                error = EOPNOTSUPP;
        !           277:                break;
        !           278: 
        !           279:        case PRU_SOCKADDR:
        !           280:                if (rp->rcb_laddr == 0) {
        !           281:                        error = EINVAL;
        !           282:                        break;
        !           283:                }
        !           284:                len = rp->rcb_laddr->sa_len;
        !           285:                bcopy((caddr_t)rp->rcb_laddr, mtod(nam, caddr_t), (unsigned)len);
        !           286:                nam->m_len = len;
        !           287:                break;
        !           288: 
        !           289:        case PRU_PEERADDR:
        !           290:                if (rp->rcb_faddr == 0) {
        !           291:                        error = ENOTCONN;
        !           292:                        break;
        !           293:                }
        !           294:                len = rp->rcb_faddr->sa_len;
        !           295:                bcopy((caddr_t)rp->rcb_faddr, mtod(nam, caddr_t), (unsigned)len);
        !           296:                nam->m_len = len;
        !           297:                break;
        !           298: 
        !           299:        default:
        !           300:                panic("raw_usrreq");
        !           301:        }
        !           302: release:
        !           303:        if (m != NULL)
        !           304:                m_freem(m);
        !           305:        return (error);
        !           306: }
        !           307: 
        !           308: rawintr() {} /* XXX - referenced by locore.  will soon go away */

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