The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netns/ns_error.c

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    1 /*      $NetBSD: ns_error.c,v 1.15 2003/08/07 16:33:45 agc Exp $        */
    2 
    3 /*
    4  * Copyright (c) 1984, 1988, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ns_error.c  8.2 (Berkeley) 9/22/94
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: ns_error.c,v 1.15 2003/08/07 16:33:45 agc Exp $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/malloc.h>
   40 #include <sys/mbuf.h>
   41 #include <sys/protosw.h>
   42 #include <sys/socket.h>
   43 #include <sys/time.h>
   44 #include <sys/kernel.h>
   45 
   46 #include <net/if.h>
   47 #include <net/route.h>
   48 
   49 #include <netns/ns.h>
   50 #include <netns/ns_pcb.h>
   51 #include <netns/ns_if.h>
   52 #include <netns/ns_var.h>
   53 #include <netns/idp.h>
   54 #include <netns/idp_var.h>
   55 #include <netns/ns_error.h>
   56 #include <netns/sp.h>
   57 #include <netns/spidp.h>
   58 #include <netns/spp_timer.h>
   59 #include <netns/spp_var.h>
   60 
   61 #ifdef lint
   62 #define NS_ERRPRINTFS 1
   63 #endif
   64 
   65 #ifdef NS_ERRPRINTFS
   66 /*
   67  * NS_ERR routines: error generation, receive packet processing, and
   68  * routines to turnaround packets back to the originator.
   69  */
   70 int     ns_errprintfs = 0;
   71 #endif
   72 
   73 struct  ns_errstat ns_errstat;
   74 
   75 int
   76 ns_err_x(c)
   77         int c;
   78 {
   79         u_int16_t *w, *lim, *base = ns_errstat.ns_es_codes;
   80         u_int16_t x = c;
   81 
   82         /*
   83          * zero is a legit error code, handle specially
   84          */
   85         if (x == 0)
   86                 return (0);
   87         lim = base + NS_ERR_MAX - 1;
   88         for (w = base + 1; w < lim; w++) {
   89                 if (*w == 0)
   90                         *w = x;
   91                 if (*w == x)
   92                         break;
   93         }
   94         return (w - base);
   95 }
   96 
   97 /*
   98  * Generate an error packet of type error
   99  * in response to bad packet.
  100  */
  101 void
  102 ns_error(om, type, param)
  103         struct mbuf *om;
  104         int type;
  105         int param;
  106 {
  107         struct ns_epidp *ep;
  108         struct mbuf *m;
  109         struct idp *nip;
  110         struct idp *oip = mtod(om, struct idp *);
  111         extern int idpcksum;
  112 
  113         /*
  114          * If this packet was sent to the echo port,
  115          * and nobody was there, just echo it.
  116          * (Yes, this is a wart!)
  117          */
  118         if (type == NS_ERR_NOSOCK &&
  119             oip->idp_dna.x_port == htons(2) &&
  120             (type = ns_echo(om))==0)
  121                 return;
  122 
  123 #ifdef NS_ERRPRINTFS
  124         if (ns_errprintfs)
  125                 printf("ns_err_error(%x, %d, %d)\n", oip, type, param);
  126 #endif
  127         /*
  128          * Don't Generate error packets in response to multicasts.
  129          */
  130         if (oip->idp_dna.x_host.c_host[0] & 1)
  131                 goto freeit;
  132 
  133         ns_errstat.ns_es_error++;
  134         /*
  135          * Make sure that the old IDP packet had 30 bytes of data to return;
  136          * if not, don't bother.  Also don't EVER error if the old
  137          * packet protocol was NS_ERR.
  138          */
  139         if (oip->idp_len < sizeof(struct idp)) {
  140                 ns_errstat.ns_es_oldshort++;
  141                 goto freeit;
  142         }
  143         if (oip->idp_pt == NSPROTO_ERROR) {
  144                 ns_errstat.ns_es_oldns_err++;
  145                 goto freeit;
  146         }
  147 
  148         /*
  149          * First, formulate ns_err message
  150          */
  151         m = m_gethdr(M_DONTWAIT, MT_HEADER);
  152         if (m == NULL)
  153                 goto freeit;
  154         m->m_len = sizeof(*ep);
  155         MH_ALIGN(m, m->m_len);
  156         ep = mtod(m, struct ns_epidp *);
  157         if ((u_int)type > NS_ERR_TOO_BIG)
  158                 panic("ns_err_error");
  159         ns_errstat.ns_es_outhist[ns_err_x(type)]++;
  160         ep->ns_ep_errp.ns_err_num = htons((u_int16_t)type);
  161         ep->ns_ep_errp.ns_err_param = htons((u_int16_t)param);
  162         bcopy((caddr_t)oip, (caddr_t)&ep->ns_ep_errp.ns_err_idp, 42);
  163         nip = &ep->ns_ep_idp;
  164         nip->idp_len = sizeof(*ep);
  165         nip->idp_len = htons((u_int16_t)nip->idp_len);
  166         nip->idp_pt = NSPROTO_ERROR;
  167         nip->idp_tc = 0;
  168         nip->idp_dna = oip->idp_sna;
  169         nip->idp_sna = oip->idp_dna;
  170         if (idpcksum) {
  171                 nip->idp_sum = 0;
  172                 nip->idp_sum = ns_cksum(m, sizeof(*ep));
  173         } else 
  174                 nip->idp_sum = 0xffff;
  175         (void) ns_output(m, (struct route *)0, 0);
  176 
  177 freeit:
  178         m_freem(om);
  179 }
  180 
  181 void
  182 ns_printhost(p)
  183 struct ns_addr *p;
  184 {
  185 
  186         printf("<net:%x%x,host:%x%x%x,port:%x>",
  187                         p->x_net.s_net[0],
  188                         p->x_net.s_net[1],
  189                         p->x_host.s_host[0],
  190                         p->x_host.s_host[1],
  191                         p->x_host.s_host[2],
  192                         p->x_port);
  193 
  194 }
  195 
  196 /*
  197  * Process a received NS_ERR message.
  198  */
  199 void
  200 ns_err_input(m)
  201         struct mbuf *m;
  202 {
  203         struct ns_errp *ep;
  204 #ifdef NS_ERRPRINTFS
  205         struct ns_epidp *epidp = mtod(m, struct ns_epidp *);
  206         int param;
  207 #endif
  208         int i;
  209         int type, code;
  210 
  211         /*
  212          * Locate ns_err structure in mbuf, and check
  213          * that not corrupted and of at least minimum length.
  214          */
  215 #ifdef NS_ERRPRINTFS
  216         if (ns_errprintfs) {
  217                 printf("ns_err_input from ");
  218                 ns_printhost(&epidp->ns_ep_idp.idp_sna);
  219                 printf("len %d\n", ntohs(epidp->ns_ep_idp.idp_len));
  220         }
  221 #endif
  222         i = sizeof (struct ns_epidp);
  223         if (((m->m_flags & M_EXT) || m->m_len < i) &&
  224                 (m = m_pullup(m, i)) == 0)  {
  225                 ns_errstat.ns_es_tooshort++;
  226                 return;
  227         }
  228         ep = &(mtod(m, struct ns_epidp *)->ns_ep_errp);
  229         type = ntohs(ep->ns_err_num);
  230 #ifdef NS_ERRPRINTFS
  231         param = ntohs(ep->ns_err_param);
  232 #endif
  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, NULL, ep);
  287                         break;
  288 
  289                 default:
  290                         idp_ctlinput(code, NULL, 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_int32_t
  307 nstime()
  308 {
  309         int s = splclock();
  310         u_int32_t 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 int
  319 ns_echo(m)
  320 struct mbuf *m;
  321 {
  322         struct idp *idp = mtod(m, struct idp *);
  323         struct echo {
  324             struct idp  ec_idp;
  325             u_int16_t           ec_op; /* Operation, 1 = request, 2 = reply */
  326         } *ec = (struct echo *)idp;
  327         struct ns_addr temp;
  328 
  329         if (idp->idp_pt!=NSPROTO_ECHO) return(NS_ERR_NOSOCK);
  330         if (ec->ec_op!=htons(1)) return(NS_ERR_UNSPEC);
  331 
  332         ec->ec_op = htons(2);
  333 
  334         temp = idp->idp_dna;
  335         idp->idp_dna = idp->idp_sna;
  336         idp->idp_sna = temp;
  337 
  338         if (idp->idp_sum != 0xffff) {
  339                 idp->idp_sum = 0;
  340                 idp->idp_sum = ns_cksum(m,
  341                     (int)(((ntohs(idp->idp_len) - 1)|1)+1));
  342         }
  343         (void) ns_output(m, (struct route *)0, NS_FORWARDING);
  344         return(0);
  345 }

Cache object: f4e9f5e6f565aa27f0c6f28a77541de9


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