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Annotation of XNU/bsd/netns/ns_error.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) 1984, 1988, 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:  *     @(#)ns_error.c  8.1 (Berkeley) 6/10/93
        !            55:  */
        !            56: 
        !            57: #include <sys/param.h>
        !            58: #include <sys/systm.h>
        !            59: #include <sys/malloc.h>
        !            60: #include <sys/mbuf.h>
        !            61: #include <sys/protosw.h>
        !            62: #include <sys/socket.h>
        !            63: #include <sys/time.h>
        !            64: #include <sys/kernel.h>
        !            65: 
        !            66: #include <net/route.h>
        !            67: 
        !            68: #include <netns/ns.h>
        !            69: #include <netns/ns_pcb.h>
        !            70: #include <netns/idp.h>
        !            71: #include <netns/ns_error.h>
        !            72: 
        !            73: #ifdef lint
        !            74: #define NS_ERRPRINTFS 1
        !            75: #endif
        !            76: 
        !            77: #ifdef NS_ERRPRINTFS
        !            78: /*
        !            79:  * NS_ERR routines: error generation, receive packet processing, and
        !            80:  * routines to turnaround packets back to the originator.
        !            81:  */
        !            82: int    ns_errprintfs = 0;
        !            83: #endif
        !            84: 
        !            85: ns_err_x(c)
        !            86: {
        !            87:        register u_short *w, *lim, *base = ns_errstat.ns_es_codes;
        !            88:        u_short x = c;
        !            89: 
        !            90:        /*
        !            91:         * zero is a legit error code, handle specially
        !            92:         */
        !            93:        if (x == 0)
        !            94:                return (0);
        !            95:        lim = base + NS_ERR_MAX - 1;
        !            96:        for (w = base + 1; w < lim; w++) {
        !            97:                if (*w == 0)
        !            98:                        *w = x;
        !            99:                if (*w == x)
        !           100:                        break;
        !           101:        }
        !           102:        return (w - base);
        !           103: }
        !           104: 
        !           105: /*
        !           106:  * Generate an error packet of type error
        !           107:  * in response to bad packet.
        !           108:  */
        !           109: 
        !           110: ns_error(om, type, param)
        !           111:        struct mbuf *om;
        !           112:        int type;
        !           113: {
        !           114:        register struct ns_epidp *ep;
        !           115:        struct mbuf *m;
        !           116:        struct idp *nip;
        !           117:        register struct idp *oip = mtod(om, struct idp *);
        !           118:        extern int idpcksum;
        !           119: 
        !           120:        /*
        !           121:         * If this packet was sent to the echo port,
        !           122:         * and nobody was there, just echo it.
        !           123:         * (Yes, this is a wart!)
        !           124:         */
        !           125:        if (type == NS_ERR_NOSOCK &&
        !           126:            oip->idp_dna.x_port == htons(2) &&
        !           127:            (type = ns_echo(om))==0)
        !           128:                return;
        !           129: 
        !           130: #ifdef NS_ERRPRINTFS
        !           131:        if (ns_errprintfs)
        !           132:                printf("ns_err_error(%x, %d, %d)\n", oip, type, param);
        !           133: #endif
        !           134:        /*
        !           135:         * Don't Generate error packets in response to multicasts.
        !           136:         */
        !           137:        if (oip->idp_dna.x_host.c_host[0] & 1)
        !           138:                goto freeit;
        !           139: 
        !           140:        ns_errstat.ns_es_error++;
        !           141:        /*
        !           142:         * Make sure that the old IDP packet had 30 bytes of data to return;
        !           143:         * if not, don't bother.  Also don't EVER error if the old
        !           144:         * packet protocol was NS_ERR.
        !           145:         */
        !           146:        if (oip->idp_len < sizeof(struct idp)) {
        !           147:                ns_errstat.ns_es_oldshort++;
        !           148:                goto freeit;
        !           149:        }
        !           150:        if (oip->idp_pt == NSPROTO_ERROR) {
        !           151:                ns_errstat.ns_es_oldns_err++;
        !           152:                goto freeit;
        !           153:        }
        !           154: 
        !           155:        /*
        !           156:         * First, formulate ns_err message
        !           157:         */
        !           158:        m = m_gethdr(M_DONTWAIT, MT_HEADER);
        !           159:        if (m == NULL)
        !           160:                goto freeit;
        !           161:        m->m_len = sizeof(*ep);
        !           162:        MH_ALIGN(m, m->m_len);
        !           163:        ep = mtod(m, struct ns_epidp *);
        !           164:        if ((u_int)type > NS_ERR_TOO_BIG)
        !           165:                panic("ns_err_error");
        !           166:        ns_errstat.ns_es_outhist[ns_err_x(type)]++;
        !           167:        ep->ns_ep_errp.ns_err_num = htons((u_short)type);
        !           168:        ep->ns_ep_errp.ns_err_param = htons((u_short)param);
        !           169:        bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
        !           170:        nip = &ep->ns_ep_idp;
        !           171:        nip->idp_len = sizeof(*ep);
        !           172:        nip->idp_len = htons((u_short)nip->idp_len);
        !           173:        nip->idp_pt = NSPROTO_ERROR;
        !           174:        nip->idp_tc = 0;
        !           175:        nip->idp_dna = oip->idp_sna;
        !           176:        nip->idp_sna = oip->idp_dna;
        !           177:        if (idpcksum) {
        !           178:                nip->idp_sum = 0;
        !           179:                nip->idp_sum = ns_cksum(m, sizeof(*ep));
        !           180:        } else 
        !           181:                nip->idp_sum = 0xffff;
        !           182:        (void) ns_output(m, (struct route *)0, 0);
        !           183: 
        !           184: freeit:
        !           185:        m_freem(om);
        !           186: }
        !           187: 
        !           188: ns_printhost(p)
        !           189: register struct ns_addr *p;
        !           190: {
        !           191: 
        !           192:        printf("<net:%x%x,host:%x%x%x,port:%x>",
        !           193:                        p->x_net.s_net[0],
        !           194:                        p->x_net.s_net[1],
        !           195:                        p->x_host.s_host[0],
        !           196:                        p->x_host.s_host[1],
        !           197:                        p->x_host.s_host[2],
        !           198:                        p->x_port);
        !           199: 
        !           200: }
        !           201: 
        !           202: /*
        !           203:  * Process a received NS_ERR message.
        !           204:  */
        !           205: ns_err_input(m)
        !           206:        struct mbuf *m;
        !           207: {
        !           208:        register struct ns_errp *ep;
        !           209:        register struct ns_epidp *epidp = mtod(m, struct ns_epidp *);
        !           210:        register int i;
        !           211:        int type, code, param;
        !           212: 
        !           213:        /*
        !           214:         * Locate ns_err structure in mbuf, and check
        !           215:         * that not corrupted and of at least minimum length.
        !           216:         */
        !           217: #ifdef NS_ERRPRINTFS
        !           218:        if (ns_errprintfs) {
        !           219:                printf("ns_err_input from ");
        !           220:                ns_printhost(&epidp->ns_ep_idp.idp_sna);
        !           221:                printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
        !           222:        }
        !           223: #endif
        !           224:        i = sizeof (struct ns_epidp);
        !           225:        if (((m->m_flags & M_EXT) || m->m_len < i) &&
        !           226:                (m = m_pullup(m, i)) == 0)  {
        !           227:                ns_errstat.ns_es_tooshort++;
        !           228:                return;
        !           229:        }
        !           230:        ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
        !           231:        type = ntohs(ep->ns_err_num);
        !           232:        param = ntohs(ep->ns_err_param);
        !           233:        ns_errstat.ns_es_inhist[ns_err_x(type)]++;
        !           234: 
        !           235: #ifdef NS_ERRPRINTFS
        !           236:        /*
        !           237:         * Message type specific processing.
        !           238:         */
        !           239:        if (ns_errprintfs)
        !           240:                printf("ns_err_input, type %d param %d\n", type, param);
        !           241: #endif
        !           242:        if (type >= NS_ERR_TOO_BIG) {
        !           243:                goto badcode;
        !           244:        }
        !           245:        ns_errstat.ns_es_outhist[ns_err_x(type)]++;
        !           246:        switch (type) {
        !           247: 
        !           248:        case NS_ERR_UNREACH_HOST:
        !           249:                code = PRC_UNREACH_NET;
        !           250:                goto deliver;
        !           251: 
        !           252:        case NS_ERR_TOO_OLD:
        !           253:                code = PRC_TIMXCEED_INTRANS;
        !           254:                goto deliver;
        !           255: 
        !           256:        case NS_ERR_TOO_BIG:
        !           257:                code = PRC_MSGSIZE;
        !           258:                goto deliver;
        !           259: 
        !           260:        case NS_ERR_FULLUP:
        !           261:                code = PRC_QUENCH;
        !           262:                goto deliver;
        !           263: 
        !           264:        case NS_ERR_NOSOCK:
        !           265:                code = PRC_UNREACH_PORT;
        !           266:                goto deliver;
        !           267: 
        !           268:        case NS_ERR_UNSPEC_T:
        !           269:        case NS_ERR_BADSUM_T:
        !           270:        case NS_ERR_BADSUM:
        !           271:        case NS_ERR_UNSPEC:
        !           272:                code = PRC_PARAMPROB;
        !           273:                goto deliver;
        !           274: 
        !           275:        deliver:
        !           276:                /*
        !           277:                 * Problem with datagram; advise higher level routines.
        !           278:                 */
        !           279: #ifdef NS_ERRPRINTFS
        !           280:                if (ns_errprintfs)
        !           281:                        printf("deliver to protocol %d\n",
        !           282:                                       ep->ns_err_idp.idp_pt);
        !           283: #endif
        !           284:                switch(ep->ns_err_idp.idp_pt) {
        !           285:                case NSPROTO_SPP:
        !           286:                        spp_ctlinput(code, (caddr_t)ep);
        !           287:                        break;
        !           288: 
        !           289:                default:
        !           290:                        idp_ctlinput(code, (caddr_t)ep);
        !           291:                }
        !           292:                
        !           293:                goto freeit;
        !           294: 
        !           295:        default:
        !           296:        badcode:
        !           297:                ns_errstat.ns_es_badcode++;
        !           298:                goto freeit;
        !           299: 
        !           300:        }
        !           301: freeit:
        !           302:        m_freem(m);
        !           303: }
        !           304: 
        !           305: #ifdef notdef
        !           306: u_long
        !           307: nstime()
        !           308: {
        !           309:        int s = splclock();
        !           310:        u_long t;
        !           311: 
        !           312:        t = (time.tv_sec % (24*60*60)) * 1000 + time.tv_usec / 1000;
        !           313:        splx(s);
        !           314:        return (htonl(t));
        !           315: }
        !           316: #endif
        !           317: 
        !           318: ns_echo(m)
        !           319: struct mbuf *m;
        !           320: {
        !           321:        register struct idp *idp = mtod(m, struct idp *);
        !           322:        register struct echo {
        !           323:            struct idp  ec_idp;
        !           324:            u_short             ec_op; /* Operation, 1 = request, 2 = reply */
        !           325:        } *ec = (struct echo *)idp;
        !           326:        struct ns_addr temp;
        !           327: 
        !           328:        if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
        !           329:        if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);
        !           330: 
        !           331:        ec->ec_op = htons(2);
        !           332: 
        !           333:        temp = idp->idp_dna;
        !           334:        idp->idp_dna = idp->idp_sna;
        !           335:        idp->idp_sna = temp;
        !           336: 
        !           337:        if (idp->idp_sum != 0xffff) {
        !           338:                idp->idp_sum = 0;
        !           339:                idp->idp_sum = ns_cksum(m,
        !           340:                    (int)(((ntohs(idp->idp_len) - 1)|1)+1));
        !           341:        }
        !           342:        (void) ns_output(m, (struct route *)0, NS_FORWARDING);
        !           343:        return(0);
        !           344: }

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