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Annotation of 43BSDReno/sys/netns/ns_error.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1984, 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)ns_error.c  7.8 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "param.h"
        !            24: #include "systm.h"
        !            25: #include "malloc.h"
        !            26: #include "mbuf.h"
        !            27: #include "protosw.h"
        !            28: #include "socket.h"
        !            29: #include "time.h"
        !            30: #include "kernel.h"
        !            31: 
        !            32: #include "../net/route.h"
        !            33: 
        !            34: #include "ns.h"
        !            35: #include "ns_pcb.h"
        !            36: #include "idp.h"
        !            37: #include "ns_error.h"
        !            38: 
        !            39: #ifdef lint
        !            40: #define NS_ERRPRINTFS 1
        !            41: #endif
        !            42: 
        !            43: #ifdef NS_ERRPRINTFS
        !            44: /*
        !            45:  * NS_ERR routines: error generation, receive packet processing, and
        !            46:  * routines to turnaround packets back to the originator.
        !            47:  */
        !            48: int    ns_errprintfs = 0;
        !            49: #endif
        !            50: 
        !            51: ns_err_x(c)
        !            52: {
        !            53:        register u_short *w, *lim, *base = ns_errstat.ns_es_codes;
        !            54:        u_short x = c;
        !            55: 
        !            56:        /*
        !            57:         * zero is a legit error code, handle specially
        !            58:         */
        !            59:        if (x == 0)
        !            60:                return (0);
        !            61:        lim = base + NS_ERR_MAX - 1;
        !            62:        for (w = base + 1; w < lim; w++) {
        !            63:                if (*w == 0)
        !            64:                        *w = x;
        !            65:                if (*w == x)
        !            66:                        break;
        !            67:        }
        !            68:        return (w - base);
        !            69: }
        !            70: 
        !            71: /*
        !            72:  * Generate an error packet of type error
        !            73:  * in response to bad packet.
        !            74:  */
        !            75: 
        !            76: ns_error(om, type, param)
        !            77:        struct mbuf *om;
        !            78:        int type;
        !            79: {
        !            80:        register struct ns_epidp *ep;
        !            81:        struct mbuf *m;
        !            82:        struct idp *nip;
        !            83:        register struct idp *oip = mtod(om, struct idp *);
        !            84:        extern int idpcksum;
        !            85: 
        !            86:        /*
        !            87:         * If this packet was sent to the echo port,
        !            88:         * and nobody was there, just echo it.
        !            89:         * (Yes, this is a wart!)
        !            90:         */
        !            91:        if (type == NS_ERR_NOSOCK &&
        !            92:            oip->idp_dna.x_port == htons(2) &&
        !            93:            (type = ns_echo(om))==0)
        !            94:                return;
        !            95: 
        !            96: #ifdef NS_ERRPRINTFS
        !            97:        if (ns_errprintfs)
        !            98:                printf("ns_err_error(%x, %d, %d)\n", oip, type, param);
        !            99: #endif
        !           100:        /*
        !           101:         * Don't Generate error packets in response to multicasts.
        !           102:         */
        !           103:        if (oip->idp_dna.x_host.c_host[0] & 1)
        !           104:                goto freeit;
        !           105: 
        !           106:        ns_errstat.ns_es_error++;
        !           107:        /*
        !           108:         * Make sure that the old IDP packet had 30 bytes of data to return;
        !           109:         * if not, don't bother.  Also don't EVER error if the old
        !           110:         * packet protocol was NS_ERR.
        !           111:         */
        !           112:        if (oip->idp_len < sizeof(struct idp)) {
        !           113:                ns_errstat.ns_es_oldshort++;
        !           114:                goto freeit;
        !           115:        }
        !           116:        if (oip->idp_pt == NSPROTO_ERROR) {
        !           117:                ns_errstat.ns_es_oldns_err++;
        !           118:                goto freeit;
        !           119:        }
        !           120: 
        !           121:        /*
        !           122:         * First, formulate ns_err message
        !           123:         */
        !           124:        m = m_gethdr(M_DONTWAIT, MT_HEADER);
        !           125:        if (m == NULL)
        !           126:                goto freeit;
        !           127:        m->m_len = sizeof(*ep);
        !           128:        MH_ALIGN(m, m->m_len);
        !           129:        ep = mtod(m, struct ns_epidp *);
        !           130:        if ((u_int)type > NS_ERR_TOO_BIG)
        !           131:                panic("ns_err_error");
        !           132:        ns_errstat.ns_es_outhist[ns_err_x(type)]++;
        !           133:        ep->ns_ep_errp.ns_err_num = htons((u_short)type);
        !           134:        ep->ns_ep_errp.ns_err_param = htons((u_short)param);
        !           135:        bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
        !           136:        nip = &ep->ns_ep_idp;
        !           137:        nip->idp_len = sizeof(*ep);
        !           138:        nip->idp_len = htons((u_short)nip->idp_len);
        !           139:        nip->idp_pt = NSPROTO_ERROR;
        !           140:        nip->idp_tc = 0;
        !           141:        nip->idp_dna = oip->idp_sna;
        !           142:        nip->idp_sna = oip->idp_dna;
        !           143:        if (idpcksum) {
        !           144:                nip->idp_sum = 0;
        !           145:                nip->idp_sum = ns_cksum(m, sizeof(*ep));
        !           146:        } else 
        !           147:                nip->idp_sum = 0xffff;
        !           148:        (void) ns_output(m, (struct route *)0, 0);
        !           149: 
        !           150: freeit:
        !           151:        m_freem(om);
        !           152: }
        !           153: 
        !           154: ns_printhost(p)
        !           155: register struct ns_addr *p;
        !           156: {
        !           157: 
        !           158:        printf("<net:%x%x,host:%x%x%x,port:%x>",
        !           159:                        p->x_net.s_net[0],
        !           160:                        p->x_net.s_net[1],
        !           161:                        p->x_host.s_host[0],
        !           162:                        p->x_host.s_host[1],
        !           163:                        p->x_host.s_host[2],
        !           164:                        p->x_port);
        !           165: 
        !           166: }
        !           167: 
        !           168: /*
        !           169:  * Process a received NS_ERR message.
        !           170:  */
        !           171: ns_err_input(m)
        !           172:        struct mbuf *m;
        !           173: {
        !           174:        register struct ns_errp *ep;
        !           175:        register struct ns_epidp *epidp = mtod(m, struct ns_epidp *);
        !           176:        register int i;
        !           177:        int type, code, param;
        !           178: 
        !           179:        /*
        !           180:         * Locate ns_err structure in mbuf, and check
        !           181:         * that not corrupted and of at least minimum length.
        !           182:         */
        !           183: #ifdef NS_ERRPRINTFS
        !           184:        if (ns_errprintfs) {
        !           185:                printf("ns_err_input from ");
        !           186:                ns_printhost(&epidp->ns_ep_idp.idp_sna);
        !           187:                printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
        !           188:        }
        !           189: #endif
        !           190:        i = sizeof (struct ns_epidp);
        !           191:        if (((m->m_flags & M_EXT) || m->m_len < i) &&
        !           192:                (m = m_pullup(m, i)) == 0)  {
        !           193:                ns_errstat.ns_es_tooshort++;
        !           194:                return;
        !           195:        }
        !           196:        ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
        !           197:        type = ntohs(ep->ns_err_num);
        !           198:        param = ntohs(ep->ns_err_param);
        !           199:        ns_errstat.ns_es_inhist[ns_err_x(type)]++;
        !           200: 
        !           201: #ifdef NS_ERRPRINTFS
        !           202:        /*
        !           203:         * Message type specific processing.
        !           204:         */
        !           205:        if (ns_errprintfs)
        !           206:                printf("ns_err_input, type %d param %d\n", type, param);
        !           207: #endif
        !           208:        if (type >= NS_ERR_TOO_BIG) {
        !           209:                goto badcode;
        !           210:        }
        !           211:        ns_errstat.ns_es_outhist[ns_err_x(type)]++;
        !           212:        switch (type) {
        !           213: 
        !           214:        case NS_ERR_UNREACH_HOST:
        !           215:                code = PRC_UNREACH_NET;
        !           216:                goto deliver;
        !           217: 
        !           218:        case NS_ERR_TOO_OLD:
        !           219:                code = PRC_TIMXCEED_INTRANS;
        !           220:                goto deliver;
        !           221: 
        !           222:        case NS_ERR_TOO_BIG:
        !           223:                code = PRC_MSGSIZE;
        !           224:                goto deliver;
        !           225: 
        !           226:        case NS_ERR_FULLUP:
        !           227:                code = PRC_QUENCH;
        !           228:                goto deliver;
        !           229: 
        !           230:        case NS_ERR_NOSOCK:
        !           231:                code = PRC_UNREACH_PORT;
        !           232:                goto deliver;
        !           233: 
        !           234:        case NS_ERR_UNSPEC_T:
        !           235:        case NS_ERR_BADSUM_T:
        !           236:        case NS_ERR_BADSUM:
        !           237:        case NS_ERR_UNSPEC:
        !           238:                code = PRC_PARAMPROB;
        !           239:                goto deliver;
        !           240: 
        !           241:        deliver:
        !           242:                /*
        !           243:                 * Problem with datagram; advise higher level routines.
        !           244:                 */
        !           245: #ifdef NS_ERRPRINTFS
        !           246:                if (ns_errprintfs)
        !           247:                        printf("deliver to protocol %d\n",
        !           248:                                       ep->ns_err_idp.idp_pt);
        !           249: #endif
        !           250:                switch(ep->ns_err_idp.idp_pt) {
        !           251:                case NSPROTO_SPP:
        !           252:                        spp_ctlinput(code, (caddr_t)ep);
        !           253:                        break;
        !           254: 
        !           255:                default:
        !           256:                        idp_ctlinput(code, (caddr_t)ep);
        !           257:                }
        !           258:                
        !           259:                goto freeit;
        !           260: 
        !           261:        default:
        !           262:        badcode:
        !           263:                ns_errstat.ns_es_badcode++;
        !           264:                goto freeit;
        !           265: 
        !           266:        }
        !           267: freeit:
        !           268:        m_freem(m);
        !           269: }
        !           270: 
        !           271: #ifdef notdef
        !           272: u_long
        !           273: nstime()
        !           274: {
        !           275:        int s = splclock();
        !           276:        u_long t;
        !           277: 
        !           278:        t = (time.tv_sec % (24*60*60)) * 1000 + time.tv_usec / 1000;
        !           279:        splx(s);
        !           280:        return (htonl(t));
        !           281: }
        !           282: #endif
        !           283: 
        !           284: ns_echo(m)
        !           285: struct mbuf *m;
        !           286: {
        !           287:        register struct idp *idp = mtod(m, struct idp *);
        !           288:        register struct echo {
        !           289:            struct idp  ec_idp;
        !           290:            u_short             ec_op; /* Operation, 1 = request, 2 = reply */
        !           291:        } *ec = (struct echo *)idp;
        !           292:        struct ns_addr temp;
        !           293: 
        !           294:        if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
        !           295:        if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);
        !           296: 
        !           297:        ec->ec_op = htons(2);
        !           298: 
        !           299:        temp = idp->idp_dna;
        !           300:        idp->idp_dna = idp->idp_sna;
        !           301:        idp->idp_sna = temp;
        !           302: 
        !           303:        if (idp->idp_sum != 0xffff) {
        !           304:                idp->idp_sum = 0;
        !           305:                idp->idp_sum = ns_cksum(m,
        !           306:                    (int)(((ntohs(idp->idp_len) - 1)|1)+1));
        !           307:        }
        !           308:        (void) ns_output(m, (struct route *)0, NS_FORWARDING);
        !           309:        return(0);
        !           310: }

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