Return to ns_error.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / sys / netns

Annotation of 43BSDTahoe/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 and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)ns_error.c  7.6 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: #include "param.h"
        !            21: #include "systm.h"
        !            22: #include "mbuf.h"
        !            23: #include "protosw.h"
        !            24: #include "socket.h"
        !            25: #include "time.h"
        !            26: #include "kernel.h"
        !            27: 
        !            28: #include "../net/route.h"
        !            29: 
        !            30: #include "ns.h"
        !            31: #include "ns_pcb.h"
        !            32: #include "idp.h"
        !            33: #include "ns_error.h"
        !            34: 
        !            35: #ifdef lint
        !            36: #define NS_ERRPRINTFS 1
        !            37: #endif
        !            38: 
        !            39: #ifdef NS_ERRPRINTFS
        !            40: /*
        !            41:  * NS_ERR routines: error generation, receive packet processing, and
        !            42:  * routines to turnaround packets back to the originator.
        !            43:  */
        !            44: int    ns_errprintfs = 0;
        !            45: #endif
        !            46: 
        !            47: ns_err_x(c)
        !            48: {
        !            49:        register u_short *w, *lim, *base = ns_errstat.ns_es_codes;
        !            50:        u_short x = c;
        !            51: 
        !            52:        /*
        !            53:         * zero is a legit error code, handle specially
        !            54:         */
        !            55:        if (x == 0)
        !            56:                return (0);
        !            57:        lim = base + NS_ERR_MAX - 1;
        !            58:        for (w = base + 1; w < lim; w++) {
        !            59:                if (*w == 0)
        !            60:                        *w = x;
        !            61:                if (*w == x)
        !            62:                        break;
        !            63:        }
        !            64:        return (w - base);
        !            65: }
        !            66: 
        !            67: /*
        !            68:  * Generate an error packet of type error
        !            69:  * in response to bad packet.
        !            70:  */
        !            71: 
        !            72: ns_error(om, type, param)
        !            73:        struct mbuf *om;
        !            74:        int type;
        !            75: {
        !            76:        register struct ns_epidp *ep;
        !            77:        struct mbuf *m;
        !            78:        struct idp *nip;
        !            79:        register struct idp *oip = mtod(om, struct idp *);
        !            80:        extern int idpcksum;
        !            81: 
        !            82:        /*
        !            83:         * If this packet was sent to the echo port,
        !            84:         * and nobody was there, just echo it.
        !            85:         * (Yes, this is a wart!)
        !            86:         */
        !            87:        if (type==NS_ERR_NOSOCK &&
        !            88:            oip->idp_dna.x_port==htons(2) &&
        !            89:            (type = ns_echo(oip)==0))
        !            90:                return;
        !            91: 
        !            92: #ifdef NS_ERRPRINTFS
        !            93:        if (ns_errprintfs)
        !            94:                printf("ns_err_error(%x, %d, %d)\n", oip, type, param);
        !            95: #endif
        !            96:        /*
        !            97:         * Don't Generate error packets in response to multicasts.
        !            98:         */
        !            99:        if (oip->idp_dna.x_host.c_host[0] & 1)
        !           100:                goto free;
        !           101: 
        !           102:        ns_errstat.ns_es_error++;
        !           103:        /*
        !           104:         * Make sure that the old IDP packet had 30 bytes of data to return;
        !           105:         * if not, don't bother.  Also don't EVER error if the old
        !           106:         * packet protocol was NS_ERR.
        !           107:         */
        !           108:        if (oip->idp_len < sizeof(struct idp)) {
        !           109:                ns_errstat.ns_es_oldshort++;
        !           110:                goto free;
        !           111:        }
        !           112:        if (oip->idp_pt == NSPROTO_ERROR) {
        !           113:                ns_errstat.ns_es_oldns_err++;
        !           114:                goto free;
        !           115:        }
        !           116: 
        !           117:        /*
        !           118:         * First, formulate ns_err message
        !           119:         */
        !           120:        m = m_get(M_DONTWAIT, MT_HEADER);
        !           121:        if (m == NULL)
        !           122:                goto free;
        !           123:        m->m_len = sizeof(*ep);
        !           124:        m->m_off = MMAXOFF - m->m_len;
        !           125:        ep = mtod(m, struct ns_epidp *);
        !           126:        if ((u_int)type > NS_ERR_TOO_BIG)
        !           127:                panic("ns_err_error");
        !           128:        ns_errstat.ns_es_outhist[ns_err_x(type)]++;
        !           129:        ep->ns_ep_errp.ns_err_num = htons((u_short)type);
        !           130:        ep->ns_ep_errp.ns_err_param = htons((u_short)param);
        !           131:        bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
        !           132:        nip = &ep->ns_ep_idp;
        !           133:        nip->idp_len = sizeof(*ep);
        !           134:        nip->idp_len = htons((u_short)nip->idp_len);
        !           135:        nip->idp_pt = NSPROTO_ERROR;
        !           136:        nip->idp_tc = 0;
        !           137:        nip->idp_dna = oip->idp_sna;
        !           138:        nip->idp_sna = oip->idp_dna;
        !           139:        if (idpcksum) {
        !           140:                nip->idp_sum = 0;
        !           141:                nip->idp_sum = ns_cksum(dtom(nip), sizeof(*ep));
        !           142:        } else 
        !           143:                nip->idp_sum = 0xffff;
        !           144:        (void) ns_output(dtom(nip), (struct route *)0, 0);
        !           145: 
        !           146: free:
        !           147:        m_freem(dtom(oip));
        !           148: }
        !           149: 
        !           150: ns_printhost(p)
        !           151: register struct ns_addr *p;
        !           152: {
        !           153: 
        !           154:        printf("<net:%x%x,host:%x%x%x,port:%x>",
        !           155:                        p->x_net.s_net[0],
        !           156:                        p->x_net.s_net[1],
        !           157:                        p->x_host.s_host[0],
        !           158:                        p->x_host.s_host[1],
        !           159:                        p->x_host.s_host[2],
        !           160:                        p->x_port);
        !           161: 
        !           162: }
        !           163: 
        !           164: /*
        !           165:  * Process a received NS_ERR message.
        !           166:  */
        !           167: ns_err_input(m)
        !           168:        struct mbuf *m;
        !           169: {
        !           170:        register struct ns_errp *ep;
        !           171:        register struct ns_epidp *epidp = mtod(m, struct ns_epidp *);
        !           172:        register int i;
        !           173:        int type, code, param;
        !           174: 
        !           175:        /*
        !           176:         * Locate ns_err structure in mbuf, and check
        !           177:         * that not corrupted and of at least minimum length.
        !           178:         */
        !           179: #ifdef NS_ERRPRINTFS
        !           180:        if (ns_errprintfs) {
        !           181:                printf("ns_err_input from ");
        !           182:                ns_printhost(&epidp->ns_ep_idp.idp_sna);
        !           183:                printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
        !           184:        }
        !           185: #endif
        !           186:        i = sizeof (struct ns_epidp);
        !           187:        if ((m->m_off > MMAXOFF || m->m_len < i) &&
        !           188:                (m = m_pullup(m, i)) == 0)  {
        !           189:                ns_errstat.ns_es_tooshort++;
        !           190:                return;
        !           191:        }
        !           192:        ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
        !           193:        type = ntohs(ep->ns_err_num);
        !           194:        param = ntohs(ep->ns_err_param);
        !           195:        ns_errstat.ns_es_inhist[ns_err_x(type)]++;
        !           196: 
        !           197: #ifdef NS_ERRPRINTFS
        !           198:        /*
        !           199:         * Message type specific processing.
        !           200:         */
        !           201:        if (ns_errprintfs)
        !           202:                printf("ns_err_input, type %d param %d\n", type, param);
        !           203: #endif
        !           204:        if (type >= NS_ERR_TOO_BIG) {
        !           205:                goto badcode;
        !           206:        }
        !           207:        ns_errstat.ns_es_outhist[ns_err_x(type)]++;
        !           208:        switch (type) {
        !           209: 
        !           210:        case NS_ERR_UNREACH_HOST:
        !           211:                code = PRC_UNREACH_NET;
        !           212:                goto deliver;
        !           213: 
        !           214:        case NS_ERR_TOO_OLD:
        !           215:                code = PRC_TIMXCEED_INTRANS;
        !           216:                goto deliver;
        !           217: 
        !           218:        case NS_ERR_TOO_BIG:
        !           219:                code = PRC_MSGSIZE;
        !           220:                goto deliver;
        !           221: 
        !           222:        case NS_ERR_FULLUP:
        !           223:                code = PRC_QUENCH;
        !           224:                goto deliver;
        !           225: 
        !           226:        case NS_ERR_NOSOCK:
        !           227:                code = PRC_UNREACH_PORT;
        !           228:                goto deliver;
        !           229: 
        !           230:        case NS_ERR_UNSPEC_T:
        !           231:        case NS_ERR_BADSUM_T:
        !           232:        case NS_ERR_BADSUM:
        !           233:        case NS_ERR_UNSPEC:
        !           234:                code = PRC_PARAMPROB;
        !           235:                goto deliver;
        !           236: 
        !           237:        deliver:
        !           238:                /*
        !           239:                 * Problem with datagram; advise higher level routines.
        !           240:                 */
        !           241: #ifdef NS_ERRPRINTFS
        !           242:                if (ns_errprintfs)
        !           243:                        printf("deliver to protocol %d\n",
        !           244:                                       ep->ns_err_idp.idp_pt);
        !           245: #endif
        !           246:                switch(ep->ns_err_idp.idp_pt) {
        !           247:                case NSPROTO_SPP:
        !           248:                        spp_ctlinput(code, (caddr_t)ep);
        !           249:                        break;
        !           250: 
        !           251:                default:
        !           252:                        idp_ctlinput(code, (caddr_t)ep);
        !           253:                }
        !           254:                
        !           255:                goto free;
        !           256: 
        !           257:        default:
        !           258:        badcode:
        !           259:                ns_errstat.ns_es_badcode++;
        !           260:                goto free;
        !           261: 
        !           262:        }
        !           263: free:
        !           264:        m_freem(m);
        !           265: }
        !           266: 
        !           267: #ifdef notdef
        !           268: u_long
        !           269: nstime()
        !           270: {
        !           271:        int s = splclock();
        !           272:        u_long t;
        !           273: 
        !           274:        t = (time.tv_sec % (24*60*60)) * 1000 + time.tv_usec / 1000;
        !           275:        splx(s);
        !           276:        return (htonl(t));
        !           277: }
        !           278: #endif
        !           279: 
        !           280: ns_echo(idp)
        !           281: register struct idp *idp;
        !           282: {
        !           283:        struct mbuf *m = dtom(idp);
        !           284:        register struct echo {
        !           285:            struct idp  ec_idp;
        !           286:            u_short             ec_op; /* Operation, 1 = request, 2 = reply */
        !           287:        } *ec = (struct echo *)idp;
        !           288:        struct ns_addr temp;
        !           289: 
        !           290:        if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
        !           291:        if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);
        !           292: 
        !           293:        ec->ec_op = htons(2);
        !           294: 
        !           295:        temp = idp->idp_dna;
        !           296:        idp->idp_dna = idp->idp_sna;
        !           297:        idp->idp_sna = temp;
        !           298: 
        !           299:        if (idp->idp_sum != 0xffff) {
        !           300:                idp->idp_sum = 0;
        !           301:                idp->idp_sum = ns_cksum(m,
        !           302:                    (int)(((ntohs(idp->idp_len) - 1)|1)+1));
        !           303:        }
        !           304:        (void) ns_output(m, (struct route *)0, NS_FORWARDING);
        !           305:        return(0);
        !           306: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.