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Annotation of XNU/bsd/net/raw_usrreq.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) 1980, 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:  *     @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #include <sys/param.h>
        !            58: #include <sys/systm.h>
        !            59: #include <sys/mbuf.h>
        !            60: #include <sys/proc.h>
        !            61: #include <sys/protosw.h>
        !            62: #include <sys/socket.h>
        !            63: #include <sys/socketvar.h>
        !            64: 
        !            65: #include <net/raw_cb.h>
        !            66: 
        !            67: /*
        !            68:  * Initialize raw connection block q.
        !            69:  */
        !            70: void
        !            71: raw_init()
        !            72: {
        !            73:        LIST_INIT(&rawcb_list);
        !            74: }
        !            75: 
        !            76: 
        !            77: /*
        !            78:  * Raw protocol input routine.  Find the socket
        !            79:  * associated with the packet(s) and move them over.  If
        !            80:  * nothing exists for this packet, drop it.
        !            81:  */
        !            82: /*
        !            83:  * Raw protocol interface.
        !            84:  */
        !            85: void
        !            86: raw_input(m0, proto, src, dst)
        !            87:        struct mbuf *m0;
        !            88:        register struct sockproto *proto;
        !            89:        struct sockaddr *src, *dst;
        !            90: {
        !            91:        register struct rawcb *rp;
        !            92:        register struct mbuf *m = m0;
        !            93:        register int sockets = 0;
        !            94:        struct socket *last;
        !            95: 
        !            96:        last = 0;
        !            97:        LIST_FOREACH(rp, &rawcb_list, list) {
        !            98:                if (rp->rcb_proto.sp_family != proto->sp_family)
        !            99:                        continue;
        !           100:                if (rp->rcb_proto.sp_protocol  &&
        !           101:                    rp->rcb_proto.sp_protocol != proto->sp_protocol)
        !           102:                        continue;
        !           103:                /*
        !           104:                 * We assume the lower level routines have
        !           105:                 * placed the address in a canonical format
        !           106:                 * suitable for a structure comparison.
        !           107:                 *
        !           108:                 * Note that if the lengths are not the same
        !           109:                 * the comparison will fail at the first byte.
        !           110:                 */
        !           111: #define        equal(a1, a2) \
        !           112:   (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
        !           113:                if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
        !           114:                        continue;
        !           115:                if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
        !           116:                        continue;
        !           117:                if (last) {
        !           118:                        struct mbuf *n;
        !           119:                        n = m_copy(m, 0, (int)M_COPYALL);
        !           120:                        if (n) {
        !           121:                                if (sbappendaddr(&last->so_rcv, src,
        !           122:                                    n, (struct mbuf *)0) == 0)
        !           123:                                        /* should notify about lost packet */
        !           124:                                        m_freem(n);
        !           125:                                else {
        !           126:                                        sorwakeup(last);
        !           127:                                        sockets++;
        !           128:                                }
        !           129:                        }
        !           130:                }
        !           131:                last = rp->rcb_socket;
        !           132:        }
        !           133:        if (last) {
        !           134:                if (sbappendaddr(&last->so_rcv, src,
        !           135:                    m, (struct mbuf *)0) == 0)
        !           136:                        m_freem(m);
        !           137:                else {
        !           138:                        sorwakeup(last);
        !           139:                        sockets++;
        !           140:                }
        !           141:        } else
        !           142:                m_freem(m);
        !           143: }
        !           144: 
        !           145: /*ARGSUSED*/
        !           146: void
        !           147: raw_ctlinput(cmd, arg, dummy)
        !           148:        int cmd;
        !           149:        struct sockaddr *arg;
        !           150:        void *dummy;
        !           151: {
        !           152: 
        !           153:        if (cmd < 0 || cmd > PRC_NCMDS)
        !           154:                return;
        !           155:        /* INCOMPLETE */
        !           156: }
        !           157: 
        !           158: static int
        !           159: raw_uabort(struct socket *so)
        !           160: {
        !           161:        struct rawcb *rp = sotorawcb(so);
        !           162: 
        !           163:        if (rp == 0)
        !           164:                return EINVAL;
        !           165:        raw_disconnect(rp);
        !           166:        sofree(so);
        !           167:        soisdisconnected(so);
        !           168:        return 0;
        !           169: }
        !           170: 
        !           171: /* pru_accept is EOPNOTSUPP */
        !           172: 
        !           173: static int
        !           174: raw_uattach(struct socket *so, int proto, struct proc *p)
        !           175: {
        !           176:        struct rawcb *rp = sotorawcb(so);
        !           177:        int error;
        !           178: 
        !           179:        if (rp == 0)
        !           180:                return EINVAL;
        !           181: #if ISFB31
        !           182:                if (p && (error = suser(p->p_ucred, &p->p_acflag)) != 0)
        !           183:                        return error;
        !           184: #else
        !           185:                if ((so->so_state & SS_PRIV) == 0)
        !           186:                        return (EPERM);
        !           187: #endif
        !           188: 
        !           189:        return raw_attach(so, proto);
        !           190: }
        !           191: 
        !           192: static int
        !           193: raw_ubind(struct socket *so, struct sockaddr *nam, struct proc *p)
        !           194: {
        !           195:        return EINVAL;
        !           196: }
        !           197: 
        !           198: static int
        !           199: raw_uconnect(struct socket *so, struct sockaddr *nam, struct proc *p)
        !           200: {
        !           201:        return EINVAL;
        !           202: }
        !           203: 
        !           204: /* pru_connect2 is EOPNOTSUPP */
        !           205: /* pru_control is EOPNOTSUPP */
        !           206: 
        !           207: static int
        !           208: raw_udetach(struct socket *so)
        !           209: {
        !           210:        struct rawcb *rp = sotorawcb(so);
        !           211: 
        !           212:        if (rp == 0)
        !           213:                return EINVAL;
        !           214: 
        !           215:        raw_detach(rp);
        !           216:        return 0;
        !           217: }
        !           218: 
        !           219: static int
        !           220: raw_udisconnect(struct socket *so)
        !           221: {
        !           222:        struct rawcb *rp = sotorawcb(so);
        !           223: 
        !           224:        if (rp == 0)
        !           225:                return EINVAL;
        !           226:        if (rp->rcb_faddr == 0) {
        !           227:                return ENOTCONN;
        !           228:        }
        !           229:        raw_disconnect(rp);
        !           230:        soisdisconnected(so);
        !           231:        return 0;
        !           232: }
        !           233: 
        !           234: /* pru_listen is EOPNOTSUPP */
        !           235: 
        !           236: static int
        !           237: raw_upeeraddr(struct socket *so, struct sockaddr **nam)
        !           238: {
        !           239:        struct rawcb *rp = sotorawcb(so);
        !           240: 
        !           241:        if (rp == 0)
        !           242:                return EINVAL;
        !           243:        if (rp->rcb_faddr == 0) {
        !           244:                return ENOTCONN;
        !           245:        }
        !           246:        *nam = dup_sockaddr(rp->rcb_faddr, 1);
        !           247:        return 0;
        !           248: }
        !           249: 
        !           250: /* pru_rcvd is EOPNOTSUPP */
        !           251: /* pru_rcvoob is EOPNOTSUPP */
        !           252: 
        !           253: static int
        !           254: raw_usend(struct socket *so, int flags, struct mbuf *m,
        !           255:          struct sockaddr *nam, struct mbuf *control, struct proc *p)
        !           256: {
        !           257:        int error;
        !           258:        struct rawcb *rp = sotorawcb(so);
        !           259: 
        !           260:        if (rp == 0) {
        !           261:                error = EINVAL;
        !           262:                goto release;
        !           263:        }
        !           264: 
        !           265:        if (flags & PRUS_OOB) {
        !           266:                error = EOPNOTSUPP;
        !           267:                goto release;
        !           268:        }
        !           269: 
        !           270:        if (control && control->m_len) {
        !           271:                error = EOPNOTSUPP;
        !           272:                goto release;
        !           273:        }
        !           274:        if (nam) {
        !           275:                if (rp->rcb_faddr) {
        !           276:                        error = EISCONN;
        !           277:                        goto release;
        !           278:                }
        !           279:                rp->rcb_faddr = nam;
        !           280:        } else if (rp->rcb_faddr == 0) {
        !           281:                error = ENOTCONN;
        !           282:                goto release;
        !           283:        }
        !           284:        error = (*so->so_proto->pr_output)(m, so);
        !           285:        m = NULL;
        !           286:        if (nam)
        !           287:                rp->rcb_faddr = 0;
        !           288: release:
        !           289:        if (m != NULL)
        !           290:                m_freem(m);
        !           291:        return (error);
        !           292: }
        !           293: 
        !           294: /* pru_sense is null */
        !           295: 
        !           296: static int
        !           297: raw_ushutdown(struct socket *so)
        !           298: {
        !           299:        struct rawcb *rp = sotorawcb(so);
        !           300: 
        !           301:        if (rp == 0)
        !           302:                return EINVAL;
        !           303:        socantsendmore(so);
        !           304:        return 0;
        !           305: }
        !           306: 
        !           307: static int
        !           308: raw_usockaddr(struct socket *so, struct sockaddr **nam)
        !           309: {
        !           310:        struct rawcb *rp = sotorawcb(so);
        !           311: 
        !           312:        if (rp == 0)
        !           313:                return EINVAL;
        !           314:        if (rp->rcb_laddr == 0)
        !           315:                return EINVAL;
        !           316:        *nam = dup_sockaddr(rp->rcb_laddr, 1);
        !           317:        return 0;
        !           318: }
        !           319: 
        !           320: struct pr_usrreqs raw_usrreqs = {
        !           321:        raw_uabort, pru_accept_notsupp, raw_uattach, raw_ubind, raw_uconnect,
        !           322:        pru_connect2_notsupp, pru_control_notsupp, raw_udetach, 
        !           323:        raw_udisconnect, pru_listen_notsupp, raw_upeeraddr, pru_rcvd_notsupp,
        !           324:        pru_rcvoob_notsupp, raw_usend, pru_sense_null, raw_ushutdown,
        !           325:        raw_usockaddr, sosend, soreceive, sopoll
        !           326: };

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