sys/net/if_spppfr.c

   1 /*-
   2  * Synchronous Frame Relay link level subroutines.
   3  * ANSI T1.617-compaible link management signaling
   4  * implemented for Frame Relay mode.
   5  * Cisco-type Frame Relay framing added, thanks Alex Tutubalin.
   6  * Only one DLCI per channel for now.
   7  *
   8  * Copyright (C) 1994-2000 Cronyx Engineering.
   9  * Author: Serge Vakulenko, <vak@cronyx.ru>
  10  *
  11  * Copyright (C) 1999-2004 Cronyx Engineering.
  12  * Author: Kurakin Roman, <rik@cronyx.ru>
  13  *
  14  * This software is distributed with NO WARRANTIES, not even the implied
  15  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * Authors grant any other persons or organisations a permission to use,
  18  * modify and redistribute this software in source and binary forms,
  19  * as long as this message is kept with the software, all derivative
  20  * works or modified versions.
  21  *
  22  * $Cronyx Id: if_spppfr.c,v 1.1.2.10 2004/06/29 09:02:30 rik Exp $
  23  * $FreeBSD$
  24  */
  25
  26 #include <sys/param.h>
  27
  28 #if defined(__FreeBSD__)
  29 #include "opt_inet.h"
  30 #include "opt_inet6.h"
  31 #endif
  32
  33 #ifdef NetBSD1_3
  34 #  if NetBSD1_3 > 6
  35 #      include "opt_inet.h"
  36 #      include "opt_inet6.h"
  37 #      include "opt_iso.h"
  38 #  endif
  39 #endif
  40
  41 #include <sys/systm.h>
  42 #include <sys/kernel.h>
  43 #include <sys/module.h>
  44 #include <sys/sockio.h>
  45 #include <sys/socket.h>
  46 #include <sys/syslog.h>
  47 #if defined(__FreeBSD__)
  48 #include <sys/random.h>
  49 #endif
  50 #include <sys/malloc.h>
  51 #include <sys/mbuf.h>
  52
  53 #if defined (__OpenBSD__)
  54 #include <sys/md5k.h>
  55 #else
  56 #include <sys/md5.h>
  57 #endif
  58
  59 #include <net/if.h>
  60 #include <net/if_var.h>
  61 #include <net/netisr.h>
  62 #include <net/if_types.h>
  63 #include <net/route.h>
  64 #include <netinet/in.h>
  65 #include <netinet/in_systm.h>
  66 #include <netinet/ip.h>
  67 #include <net/slcompress.h>
  68
  69 #if defined (__NetBSD__) || defined (__OpenBSD__)
  70 #include <machine/cpu.h> /* XXX for softnet */
  71 #endif
  72
  73 #include <machine/stdarg.h>
  74
  75 #include <netinet/in_var.h>
  76 #ifdef INET
  77 #include <netinet/ip.h>
  78 #include <netinet/tcp.h>
  79 #endif
  80
  81 #if defined (__FreeBSD__) || defined (__OpenBSD__)
  82 #  include <netinet/if_ether.h>
  83 #else
  84 #  include <net/ethertypes.h>
  85 #endif
  86
  87 #include <net/if_sppp.h>
  88
  89 /*
  90  * Frame Relay.
  91  */
  92 #define FR_UI           0x03    /* Unnumbered Information */
  93 #define FR_IP           0xCC    /* IP protocol identifier */
  94 #define FR_PADDING      0x00    /* NLPID padding */
  95 #define FR_SIGNALING    0x08    /* Q.933/T1.617 signaling identifier */
  96 #define FR_SNAP         0x80    /* NLPID snap */
  97
  98 /*
  99  * Header flags.
 100  */
 101 #define FR_DE           0x02    /* discard eligibility */
 102 #define FR_FECN         0x04    /* forward notification */
 103 #define FR_BECN         0x08    /* backward notification */
 104
 105 /*
 106  * Signaling message types.
 107  */
 108 #define FR_MSG_ENQUIRY  0x75    /* status enquiry */
 109 #define FR_MSG_STATUS   0x7d    /* status */
 110
 111 #define FR_ENQUIRY_SIZE 14
 112
 113 /*
 114  * Message field types.
 115  */
 116 #define FR_FLD_RTYPE    0x01    /* report type */
 117 #define FR_FLD_VERIFY   0x03    /* link verification */
 118 #define FR_FLD_PVC      0x07    /* PVC status */
 119 #define FR_FLD_LSHIFT5  0x95    /* locking shift 5 */
 120
 121 /*
 122  * Report types.
 123  */
 124 #define FR_RTYPE_FULL   0       /* full status */
 125 #define FR_RTYPE_SHORT  1       /* link verification only */
 126 #define FR_RTYPE_SINGLE 2       /* single PVC status */
 127
 128 /* PVC status field. */
 129 #define FR_DLCI_DELETE  0x04    /* PVC is deleted */
 130 #define FR_DLCI_ACTIVE  0x02    /* PVC is operational */
 131 #define FR_DLCI_NEW     0x08    /* PVC is new */
 132
 133 struct arp_req {
 134         unsigned short  htype;          /* hardware type = ARPHRD_FRELAY */
 135         unsigned short  ptype;          /* protocol type = ETHERTYPE_IP */
 136         unsigned char   halen;          /* hardware address length = 2 */
 137         unsigned char   palen;          /* protocol address length = 4 */
 138         unsigned short  op;             /* ARP/RARP/InARP request/reply */
 139         unsigned short  hsource;        /* hardware source address */
 140         unsigned short  psource1;       /* protocol source */
 141         unsigned short  psource2;
 142         unsigned short  htarget;        /* hardware target address */
 143         unsigned short  ptarget1;       /* protocol target */
 144         unsigned short  ptarget2;
 145 } __packed;
 146
 147 #if defined(__FreeBSD__) && __FreeBSD_version < 501113
 148 #define SPP_FMT         "%s%d: "
 149 #define SPP_ARGS(ifp)   (ifp)->if_name, (ifp)->if_unit
 150 #else
 151 #define SPP_FMT         "%s: "
 152 #define SPP_ARGS(ifp)   (ifp)->if_xname
 153 #endif
 154
 155 /* almost every function needs these */
 156 #define STDDCL                                                  \
 157         struct ifnet *ifp = SP2IFP(sp);                         \
 158         int debug = ifp->if_flags & IFF_DEBUG
 159
 160 static void sppp_fr_arp (struct sppp *sp, struct arp_req *req, u_short addr);
 161 static void sppp_fr_signal (struct sppp *sp, unsigned char *h, int len);
 162
 163 void sppp_fr_input (struct sppp *sp, struct mbuf *m)
 164 {
 165         STDDCL;
 166         u_char *h = mtod (m, u_char*);
 167         int isr = -1;
 168         int dlci, hlen, proto;
 169
 170         /* Get the DLCI number. */
 171         if (m->m_pkthdr.len < 10) {
 172 bad:            m_freem (m);
 173                 return;
 174         }
 175         dlci = (h[0] << 2 & 0x3f0) | (h[1] >> 4 & 0x0f);
 176
 177         /* Process signaling packets. */
 178         if (dlci == 0) {
 179                 sppp_fr_signal (sp, h, m->m_pkthdr.len);
 180                 m_freem (m);
 181                 return;
 182         }
 183
 184         if (dlci != sp->fr_dlci) {
 185                 if (debug)
 186                         printf (SPP_FMT "Received packet from invalid DLCI %d\n",
 187                                 SPP_ARGS(ifp), dlci);
 188                 goto bad;
 189         }
 190
 191         /* Process the packet. */
 192         if (ntohs (*(short*) (h+2)) == ETHERTYPE_IP) {
 193                 /* Prehistoric IP framing? */
 194                 h[2] = FR_UI;
 195                 h[3] = FR_IP;
 196         }
 197         if (h[2] != FR_UI) {
 198                 if (debug)
 199                         printf (SPP_FMT "Invalid frame relay header flag 0x%02x\n",
 200                                 SPP_ARGS(ifp), h[2]);
 201                 goto bad;
 202         }
 203         switch (h[3]) {
 204         default:
 205                 if (debug)
 206                         printf (SPP_FMT "Unsupported NLPID 0x%02x\n",
 207                                 SPP_ARGS(ifp), h[3]);
 208                 goto bad;
 209
 210         case FR_PADDING:
 211                 if (h[4] != FR_SNAP) {
 212                         if (debug)
 213                                 printf (SPP_FMT "Bad NLPID 0x%02x\n",
 214                                         SPP_ARGS(ifp), h[4]);
 215                         goto bad;
 216                 }
 217                 if (h[5] || h[6] || h[7]) {
 218                         if (debug)
 219                                 printf (SPP_FMT "Bad OID 0x%02x-0x%02x-0x%02x\n",
 220                                         SPP_ARGS(ifp),
 221                                         h[5], h[6], h[7]);
 222                         goto bad;
 223                 }
 224                 proto = ntohs (*(short*) (h+8));
 225                 if (proto == ETHERTYPE_ARP) {
 226                         /* Process the ARP request. */
 227                         if (m->m_pkthdr.len != 10 + sizeof (struct arp_req)) {
 228                                 if (debug)
 229                                         printf (SPP_FMT "Bad ARP request size = %d bytes\n",
 230                                                 SPP_ARGS(ifp),
 231                                                 m->m_pkthdr.len);
 232                                 goto bad;
 233                         }
 234                         sppp_fr_arp (sp, (struct arp_req*) (h + 10),
 235                                 h[0] << 8 | h[1]);
 236                         m_freem (m);
 237                         return;
 238                 }
 239                 hlen = 10;
 240                 break;
 241
 242         case FR_IP:
 243                 proto = ETHERTYPE_IP;
 244                 hlen = 4;
 245                 break;
 246         }
 247
 248         /* Remove frame relay header. */
 249         m_adj (m, hlen);
 250
 251         switch (proto) {
 252         default:
 253                 if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
 254 drop:           if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 255                 if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
 256                 m_freem (m);
 257                 return;
 258 #ifdef INET
 259         case ETHERTYPE_IP:
 260                 isr = NETISR_IP;
 261                 break;
 262 #endif
 263         }
 264
 265         if (! (ifp->if_flags & IFF_UP))
 266                 goto drop;
 267
 268         M_SETFIB(m, ifp->if_fib);
 269
 270         /* Check queue. */
 271         if (netisr_queue(isr, m)) {     /* (0) on success. */
 272                 if (debug)
 273                         log(LOG_DEBUG, SPP_FMT "protocol queue overflow\n",
 274                                 SPP_ARGS(ifp));
 275         }
 276 }
 277
 278 /*
 279  * Add the frame relay header to the packet.
 280  * For IP the header length is 4 bytes,
 281  * for all other protocols - 10 bytes (RFC 1490).
 282  */
 283 struct mbuf *sppp_fr_header (struct sppp *sp, struct mbuf *m,
 284         int family)
 285 {
 286         STDDCL;
 287         u_char *h;
 288         int type, hlen;
 289
 290         /* Prepend the space for Frame Relay header. */
 291         hlen = (family == AF_INET) ? 4 : 10;
 292         M_PREPEND (m, hlen, M_NOWAIT);
 293         if (! m)
 294                 return 0;
 295         h = mtod (m, u_char*);
 296
 297         /* Fill the header. */
 298         h[0] = sp->fr_dlci >> 2 & 0xfc;
 299         h[1] = sp->fr_dlci << 4 | 1;
 300         h[2] = FR_UI;
 301
 302         switch (family) {
 303         default:
 304                 if (debug)
 305                         printf (SPP_FMT "Cannot handle address family %d\n",
 306                                 SPP_ARGS(ifp), family);
 307                 m_freem (m);
 308                 return 0;
 309 #ifdef INET
 310         case AF_INET:
 311 #if 0 /* Crashes on fragmented packets */
 312                 /*
 313                  * Set the discard eligibility bit, if:
 314                  * 1) no fragmentation
 315                  * 2) length > 400 bytes
 316                  * 3a) the protocol is UDP or
 317                  * 3b) TCP data (no control bits)
 318                  */
 319                 {
 320                 struct ip *ip = (struct ip*) (h + hlen);
 321                 struct tcphdr *tcp = (struct tcphdr*) ((long*)ip + ip->ip_hl);
 322
 323                 if (! (ip->ip_off & ~IP_DF) && ip->ip_len > 400 &&
 324                     (ip->ip_p == IPPROTO_UDP ||
 325                     ip->ip_p == IPPROTO_TCP && ! tcp->th_flags))
 326                         h[1] |= FR_DE;
 327                 }
 328 #endif
 329                 h[3] = FR_IP;
 330                 return m;
 331 #endif
 332 #ifdef NS
 333         case AF_NS:
 334                 type = 0x8137;
 335                 break;
 336 #endif
 337         }
 338         h[3] = FR_PADDING;
 339         h[4] = FR_SNAP;
 340         h[5] = 0;
 341         h[6] = 0;
 342         h[7] = 0;
 343         *(short*) (h+8) = htons(type);
 344         return m;
 345 }
 346
 347 /*
 348  * Send periodical frame relay link verification messages via DLCI 0.
 349  * Called every 10 seconds (default value of T391 timer is 10 sec).
 350  * Every 6-th message is a full status request
 351  * (default value of N391 counter is 6).
 352  */
 353 void sppp_fr_keepalive (struct sppp *sp)
 354 {
 355         STDDCL;
 356         unsigned char *h, *p;
 357         struct mbuf *m;
 358
 359         MGETHDR (m, M_NOWAIT, MT_DATA);
 360         if (! m)
 361                 return;
 362         m->m_pkthdr.rcvif = 0;
 363
 364         h = mtod (m, u_char*);
 365         p = h;
 366         *p++ = 0;                       /* DLCI = 0 */
 367         *p++ = 1;
 368         *p++ = FR_UI;
 369         *p++ = FR_SIGNALING;            /* NLPID = UNI call control */
 370
 371         *p++ = 0;                       /* call reference length = 0 */
 372         *p++ = FR_MSG_ENQUIRY;          /* message type = status enquiry */
 373
 374         *p++ = FR_FLD_LSHIFT5;          /* locking shift 5 */
 375
 376         *p++ = FR_FLD_RTYPE;            /* report type field */
 377         *p++ = 1;                       /* report type length = 1 */
 378         if (sp->pp_seq[IDX_LCP] % 6)
 379                 *p++ = FR_RTYPE_SHORT;  /* link verification only */
 380         else
 381                 *p++ = FR_RTYPE_FULL;   /* full status needed */
 382
 383         if (sp->pp_seq[IDX_LCP] >= 255)
 384                 sp->pp_seq[IDX_LCP] = 0;
 385         *p++ = FR_FLD_VERIFY;           /* link verification type field */
 386         *p++ = 2;                       /* link verification field length = 2 */
 387         *p++ = ++sp->pp_seq[IDX_LCP];   /* our sequence number */
 388         *p++ = sp->pp_rseq[IDX_LCP];    /* last received sequence number */
 389
 390         m->m_pkthdr.len = m->m_len = p - h;
 391         if (debug)
 392                 printf (SPP_FMT "send lmi packet, seq=%d, rseq=%d\n",
 393                         SPP_ARGS(ifp), (u_char) sp->pp_seq[IDX_LCP],
 394                         (u_char) sp->pp_rseq[IDX_LCP]);
 395
 396         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
 397                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 398 }
 399
 400 /*
 401  * Process the frame relay Inverse ARP request.
 402  */
 403 static void sppp_fr_arp (struct sppp *sp, struct arp_req *req,
 404         u_short his_hardware_address)
 405 {
 406         STDDCL;
 407         struct mbuf *m;
 408         struct arp_req *reply;
 409         u_char *h;
 410         u_short my_hardware_address;
 411         u_long his_ip_address, my_ip_address;
 412
 413         if ((ntohs (req->htype) != ARPHRD_FRELAY ||
 414             ntohs (req->htype) != 16) || /* for BayNetworks routers */
 415             ntohs (req->ptype) != ETHERTYPE_IP) {
 416                 if (debug)
 417                         printf (SPP_FMT "Invalid ARP hardware/protocol type = 0x%x/0x%x\n",
 418                                 SPP_ARGS(ifp),
 419                                 ntohs (req->htype), ntohs (req->ptype));
 420                 return;
 421         }
 422         if (req->halen != 2 || req->palen != 4) {
 423                 if (debug)
 424                         printf (SPP_FMT "Invalid ARP hardware/protocol address length = %d/%d\n",
 425                                 SPP_ARGS(ifp),
 426                                 req->halen, req->palen);
 427                 return;
 428         }
 429         switch (ntohs (req->op)) {
 430         default:
 431                 if (debug)
 432                         printf (SPP_FMT "Invalid ARP op = 0x%x\n",
 433                                 SPP_ARGS(ifp), ntohs (req->op));
 434                 return;
 435
 436         case ARPOP_INVREPLY:
 437                 /* Ignore. */
 438                 return;
 439
 440         case ARPOP_INVREQUEST:
 441                 my_hardware_address = ntohs (req->htarget);
 442                 his_ip_address = ntohs (req->psource1) << 16 |
 443                         ntohs (req->psource2);
 444                 my_ip_address = ntohs (req->ptarget1) << 16 |
 445                         ntohs (req->ptarget2);
 446                 break;
 447         }
 448         if (debug)
 449                 printf (SPP_FMT "got ARP request, source=0x%04x/%d.%d.%d.%d, target=0x%04x/%d.%d.%d.%d\n",
 450                         SPP_ARGS(ifp), ntohs (req->hsource),
 451                         (unsigned char) (his_ip_address >> 24),
 452                         (unsigned char) (his_ip_address >> 16),
 453                         (unsigned char) (his_ip_address >> 8),
 454                         (unsigned char) his_ip_address,
 455                         my_hardware_address,
 456                         (unsigned char) (my_ip_address >> 24),
 457                         (unsigned char) (my_ip_address >> 16),
 458                         (unsigned char) (my_ip_address >> 8),
 459                         (unsigned char) my_ip_address);
 460
 461         sppp_get_ip_addrs (sp, &my_ip_address, 0, 0);
 462         if (! my_ip_address)
 463                 return;         /* nothing to reply */
 464
 465         if (debug)
 466                 printf (SPP_FMT "send ARP reply, source=0x%04x/%d.%d.%d.%d, target=0x%04x/%d.%d.%d.%d\n",
 467                         SPP_ARGS(ifp), my_hardware_address,
 468                         (unsigned char) (my_ip_address >> 24),
 469                         (unsigned char) (my_ip_address >> 16),
 470                         (unsigned char) (my_ip_address >> 8),
 471                         (unsigned char) my_ip_address,
 472                         his_hardware_address,
 473                         (unsigned char) (his_ip_address >> 24),
 474                         (unsigned char) (his_ip_address >> 16),
 475                         (unsigned char) (his_ip_address >> 8),
 476                         (unsigned char) his_ip_address);
 477
 478         /* Send the Inverse ARP reply. */
 479         MGETHDR (m, M_NOWAIT, MT_DATA);
 480         if (! m)
 481                 return;
 482         m->m_pkthdr.len = m->m_len = 10 + sizeof (*reply);
 483         m->m_pkthdr.rcvif = 0;
 484
 485         h = mtod (m, u_char*);
 486         reply = (struct arp_req*) (h + 10);
 487
 488         h[0] = his_hardware_address >> 8;
 489         h[1] = his_hardware_address;
 490         h[2] = FR_UI;
 491         h[3] = FR_PADDING;
 492         h[4] = FR_SNAP;
 493         h[5] = 0;
 494         h[6] = 0;
 495         h[7] = 0;
 496         *(short*) (h+8) = htons (ETHERTYPE_ARP);
 497
 498         reply->htype    = htons (ARPHRD_FRELAY);
 499         reply->ptype    = htons (ETHERTYPE_IP);
 500         reply->halen    = 2;
 501         reply->palen    = 4;
 502         reply->op       = htons (ARPOP_INVREPLY);
 503         reply->hsource  = htons (my_hardware_address);
 504         reply->psource1 = htonl (my_ip_address);
 505         reply->psource2 = htonl (my_ip_address) >> 16;
 506         reply->htarget  = htons (his_hardware_address);
 507         reply->ptarget1 = htonl (his_ip_address);
 508         reply->ptarget2 = htonl (his_ip_address) >> 16;
 509
 510         if (! IF_HANDOFF_ADJ(&sp->pp_cpq, m, ifp, 3))
 511                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 512 }
 513
 514 /*
 515  * Process the input signaling packet (DLCI 0).
 516  * The implemented protocol is ANSI T1.617 Annex D.
 517  */
 518 static void sppp_fr_signal (struct sppp *sp, unsigned char *h, int len)
 519 {
 520         STDDCL;
 521         u_char *p;
 522         int dlci;
 523
 524         if (h[2] != FR_UI || h[3] != FR_SIGNALING || h[4] != 0) {
 525                 if (debug)
 526                         printf (SPP_FMT "Invalid signaling header\n",
 527                                 SPP_ARGS(ifp));
 528 bad:            if (debug) {
 529                         printf ("%02x", *h++);
 530                         while (--len > 0)
 531                                 printf ("-%02x", *h++);
 532                         printf ("\n");
 533                 }
 534                 return;
 535         }
 536         if (h[5] == FR_MSG_ENQUIRY) {
 537                 if (len == FR_ENQUIRY_SIZE &&
 538                     h[12] == (u_char) sp->pp_seq[IDX_LCP]) {
 539                         sp->pp_seq[IDX_LCP] = random();
 540                         printf (SPP_FMT "loopback detected\n",
 541                                 SPP_ARGS(ifp));
 542                 }
 543                 return;
 544         }
 545         if (h[5] != FR_MSG_STATUS) {
 546                 if (debug)
 547                         printf (SPP_FMT "Unknown signaling message: 0x%02x\n",
 548                                 SPP_ARGS(ifp), h[5]);
 549                 goto bad;
 550         }
 551
 552         /* Parse message fields. */
 553         for (p=h+6; p<h+len; ) {
 554                 switch (*p) {
 555                 default:
 556                         if (debug)
 557                                 printf (SPP_FMT "Unknown signaling field 0x%x\n",
 558                                         SPP_ARGS(ifp), *p);
 559                         break;
 560                 case FR_FLD_LSHIFT5:
 561                 case FR_FLD_RTYPE:
 562                         /* Ignore. */
 563                         break;
 564                 case FR_FLD_VERIFY:
 565                         if (p[1] != 2) {
 566                                 if (debug)
 567                                         printf (SPP_FMT "Invalid signaling verify field length %d\n",
 568                                                 SPP_ARGS(ifp), p[1]);
 569                                 break;
 570                         }
 571                         sp->pp_rseq[IDX_LCP] = p[2];
 572                         if (debug) {
 573                                 printf (SPP_FMT "got lmi reply rseq=%d, seq=%d",
 574                                         SPP_ARGS(ifp), p[2], p[3]);
 575                                 if (p[3] != (u_char) sp->pp_seq[IDX_LCP])
 576                                         printf (" (really %d)",
 577                                                 (u_char) sp->pp_seq[IDX_LCP]);
 578                                 printf ("\n");
 579                         }
 580                         break;
 581                 case FR_FLD_PVC:
 582                         if (p[1] < 3) {
 583                                 if (debug)
 584                                         printf (SPP_FMT "Invalid PVC status length %d\n",
 585                                                 SPP_ARGS(ifp), p[1]);
 586                                 break;
 587                         }
 588                         dlci = (p[2] << 4 & 0x3f0) | (p[3] >> 3 & 0x0f);
 589                         if (! sp->fr_dlci)
 590                                 sp->fr_dlci = dlci;
 591                         if (sp->fr_status != p[4])
 592                                 printf (SPP_FMT "DLCI %d %s%s\n",
 593                                         SPP_ARGS(ifp), dlci,
 594                                         p[4] & FR_DLCI_DELETE ? "deleted" :
 595                                         p[4] & FR_DLCI_ACTIVE ? "active" : "passive",
 596                                         p[4] & FR_DLCI_NEW ? ", new" : "");
 597                         sp->fr_status = p[4];
 598                         break;
 599                 }
 600                 if (*p & 0x80)
 601                         ++p;
 602                 else if (p < h+len+1 && p[1])
 603                         p += 2 + p[1];
 604                 else {
 605                         if (debug)
 606                                 printf (SPP_FMT "Invalid signaling field 0x%x\n",
 607                                         SPP_ARGS(ifp), *p);
 608                         goto bad;
 609                 }
 610         }
 611 }