sys/net/i4b/driver/i4b_ipr.c

   1 /*
   2  * Copyright (c) 1997, 2001 Hellmuth Michaelis. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  23  * SUCH DAMAGE.
  24  *
  25  *---------------------------------------------------------------------------
  26  *
  27  *      i4b_ipr.c - isdn4bsd IP over raw HDLC ISDN network driver
  28  *      ---------------------------------------------------------
  29  *
  30  * $FreeBSD: src/sys/i4b/driver/i4b_ipr.c,v 1.8.2.3 2001/10/27 15:48:17 hm Exp $
  31  * $DragonFly: src/sys/net/i4b/driver/i4b_ipr.c,v 1.21 2008/01/06 16:55:52 swildner Exp $
  32  *
  33  *      last edit-date: [Fri Oct 26 19:32:38 2001]
  34  *
  35  *---------------------------------------------------------------------------*
  36  *
  37  *      statistics counter usage (interface lifetime):
  38  *      ----------------------------------------------
  39  *      sc->sc_if.if_ipackets   # of received packets
  40  *      sc->sc_if.if_ierrors    # of error packets not going to upper layers
  41  *      sc->sc_if.if_opackets   # of transmitted packets
  42  *      sc->sc_if.if_oerrors    # of error packets not being transmitted
  43  *      sc->sc_if.if_collisions # of invalid ip packets after VJ decompression
  44  *      sc->sc_if.if_ibytes     # of bytes coming in from the line (before VJ)
  45  *      sc->sc_if.if_obytes     # of bytes going out to the line (after VJ)
  46  *      sc->sc_if.if_imcasts      (currently unused)
  47  *      sc->sc_if.if_omcasts    # of frames sent out of the fastqueue
  48  *      sc->sc_if.if_iqdrops    # of frames dropped on input because queue full
  49  *      sc->sc_if.if_noproto    # of frames dropped on output because !AF_INET
  50  *
  51  *      statistics counter usage (connection lifetime):
  52  *      -----------------------------------------------
  53  *      sc->sc_iinb             # of ISDN incoming bytes from HSCX
  54  *      sc->sc_ioutb            # of ISDN outgoing bytes from HSCX
  55  *      sc->sc_inb              # of incoming bytes after decompression
  56  *      sc->sc_outb             # of outgoing bytes before compression
  57  *
  58  *---------------------------------------------------------------------------*/
  59
  60 #include "use_i4bipr.h"
  61
  62 #if NI4BIPR > 0
  63
  64 #include "opt_i4b.h"
  65
  66 #include <sys/param.h>
  67 #include <sys/systm.h>
  68 #include <sys/mbuf.h>
  69 #include <sys/socket.h>
  70 #include <sys/errno.h>
  71
  72 #include <sys/ioccom.h>
  73 #include <sys/sockio.h>
  74 #ifdef IPR_VJ
  75 #include <sys/malloc.h>
  76 #endif
  77
  78 #include <sys/kernel.h>
  79 #include <sys/thread2.h>
  80
  81 #include <net/if.h>
  82 #include <net/if_types.h>
  83 #include <net/netisr.h>
  84
  85 #include <netinet/in.h>
  86 #include <netinet/in_systm.h>
  87 #include <netinet/in_var.h>
  88 #include <netinet/ip.h>
  89
  90 #ifdef IPR_VJ
  91 #include <net/slcompress.h>
  92 #define IPR_COMPRESS IFF_LINK0  /* compress TCP traffic */
  93 #define IPR_AUTOCOMP IFF_LINK1  /* auto-enable TCP compression */
  94
  95 /*---------------------------------------------------------------------------
  96  * NOTICE: using NO separate buffer relies on the assumption, that the HSCX
  97  * IRQ handler _always_ allocates a single, continuous mbuf cluster large
  98  * enough to hold the maximum MTU size if the ipr interface !
  99  *
 100  * CAUTION: i have re-defined IPR_VJ_USEBUFFER because it makes problems
 101  *          with 2 i4b's back to back running cvs over ssh, cvs simply
 102  *          aborts because it gets bad data. Everything else (telnet/ftp?etc)
 103  *          functions fine.
 104  *---------------------------------------------------------------------------*/
 105 #define IPR_VJ_USEBUFFER        /* define to use an allocated separate buffer*/
 106                                 /* undef to uncompress in the mbuf itself    */
 107 #endif /* IPR_VJ */
 108
 109 #include "use_bpf.h"
 110
 111 #if NBPFILTER > 0 || NBPF > 0
 112 #include <sys/time.h>
 113 #include <net/bpf.h>
 114 #endif
 115
 116 #include <net/i4b/include/machine/i4b_debug.h>
 117 #include <net/i4b/include/machine/i4b_ioctl.h>
 118
 119 #include "../include/i4b_global.h"
 120 #include "../include/i4b_l3l4.h"
 121
 122 #include "../layer4/i4b_l4.h"
 123
 124 #define IPR_FMT "%s: "
 125 #define IPR_ARG(sc)     ((sc)->sc_if.if_xname)
 126 #define PDEVSTATIC      /* not static */
 127
 128 #define I4BIPRMTU       1500            /* regular MTU */
 129 #define I4BIPRMAXMTU    2000            /* max MTU */
 130 #define I4BIPRMINMTU    500             /* min MTU */
 131
 132 #define I4BIPRMAXQLEN   50              /* max queue length */
 133
 134 #define I4BIPRACCT      1               /* enable accounting messages */
 135 #define I4BIPRACCTINTVL 2               /* accounting msg interval in secs */
 136 #define I4BIPRADJFRXP   1               /* adjust 1st rxd packet */
 137
 138 /* initialized by L4 */
 139
 140 static drvr_link_t ipr_drvr_linktab[NI4BIPR];
 141 static isdn_link_t *isdn_linktab[NI4BIPR];
 142
 143 struct ipr_softc {
 144         struct ifnet    sc_if;          /* network-visible interface    */
 145         int             sc_state;       /* state of the interface       */
 146         int             sc_unit;        /* unit number                  */
 147         call_desc_t     *sc_cdp;        /* ptr to call descriptor       */
 148         int             sc_updown;      /* soft state of interface      */
 149         struct ifqueue  sc_fastq;       /* interactive traffic          */
 150         int             sc_dialresp;    /* dialresponse                 */
 151         int             sc_lastdialresp;/* last dialresponse            */
 152
 153 #if I4BIPRACCT
 154         int             sc_iinb;        /* isdn driver # of inbytes     */
 155         int             sc_ioutb;       /* isdn driver # of outbytes    */
 156         int             sc_inb;         /* # of bytes rx'd              */
 157         int             sc_outb;        /* # of bytes tx'd              */
 158         int             sc_linb;        /* last # of bytes rx'd         */
 159         int             sc_loutb;       /* last # of bytes tx'd         */
 160         int             sc_fn;          /* flag, first null acct        */
 161 #endif
 162
 163         struct callout  sc_timeout;
 164
 165 #ifdef I4BIPRADJFRXP
 166         int             sc_first_pkt;   /* flag, first rxd packet       */
 167 #endif
 168 #if IPR_LOG
 169         int             sc_log_first;   /* log first n packets          */
 170 #endif
 171
 172 #ifdef IPR_VJ
 173         struct slcompress sc_compr;     /* tcp compression data         */
 174 #ifdef IPR_VJ_USEBUFFER
 175         u_char          *sc_cbuf;       /* tcp decompression buffer     */
 176 #endif
 177 #endif
 178
 179 } ipr_softc[NI4BIPR];
 180
 181 enum ipr_states {
 182         ST_IDLE,                        /* initialized, ready, idle     */
 183         ST_DIALING,                     /* dialling out to remote       */
 184         ST_CONNECTED_W,                 /* connected to remote          */
 185         ST_CONNECTED_A,                 /* connected to remote          */
 186 };
 187
 188 #define THE_UNIT        sc->sc_unit
 189
 190 #  define IOCTL_CMD_T u_long
 191
 192 PDEVSTATIC void i4biprattach(void *);
 193 PSEUDO_SET(i4biprattach, i4b_ipr);
 194 static int i4biprioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, caddr_t data,
 195                        struct ucred *cr);
 196 static void iprwatchdog(struct ifnet *ifp);
 197 static void ipr_init_linktab(int unit);
 198 static void ipr_tx_queue_empty(int unit);
 199 static int i4biproutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rtp);
 200 static void iprclearqueues(struct ipr_softc *sc);
 201
 202 /*===========================================================================*
 203  *                      DEVICE DRIVER ROUTINES
 204  *===========================================================================*/
 205
 206 /*---------------------------------------------------------------------------*
 207  *      interface attach routine at kernel boot time
 208  *---------------------------------------------------------------------------*/
 209 PDEVSTATIC void
 210 i4biprattach(void *dummy)
 211 {
 212         struct ipr_softc *sc = ipr_softc;
 213         int i;
 214
 215 #ifdef IPR_VJ
 216         kprintf("i4bipr: %d IP over raw HDLC ISDN device(s) attached (VJ header compression)\n", NI4BIPR);
 217 #else
 218         kprintf("i4bipr: %d IP over raw HDLC ISDN device(s) attached\n", NI4BIPR);
 219 #endif
 220
 221         for(i=0; i < NI4BIPR; sc++, i++)
 222         {
 223                 ipr_init_linktab(i);
 224
 225                 NDBGL4(L4_DIALST, "setting dial state to ST_IDLE");
 226
 227                 sc->sc_state = ST_IDLE;
 228
 229                 if_initname(&(sc->sc_if), "ipr", i);
 230
 231 #ifdef  IPR_VJ
 232                 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_SIMPLEX | IPR_AUTOCOMP;
 233 #else
 234                 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_SIMPLEX;
 235 #endif
 236
 237                 callout_init(&sc->sc_timeout);
 238
 239                 sc->sc_if.if_mtu = I4BIPRMTU;
 240                 sc->sc_if.if_type = IFT_ISDNBASIC;
 241                 sc->sc_if.if_ioctl = i4biprioctl;
 242                 sc->sc_if.if_output = i4biproutput;
 243
 244                 sc->sc_if.if_snd.ifq_maxlen = I4BIPRMAXQLEN;
 245                 sc->sc_fastq.ifq_maxlen = I4BIPRMAXQLEN;
 246
 247                 sc->sc_if.if_ipackets = 0;
 248                 sc->sc_if.if_ierrors = 0;
 249                 sc->sc_if.if_opackets = 0;
 250                 sc->sc_if.if_oerrors = 0;
 251                 sc->sc_if.if_collisions = 0;
 252                 sc->sc_if.if_ibytes = 0;
 253                 sc->sc_if.if_obytes = 0;
 254                 sc->sc_if.if_imcasts = 0;
 255                 sc->sc_if.if_omcasts = 0;
 256                 sc->sc_if.if_iqdrops = 0;
 257                 sc->sc_if.if_noproto = 0;
 258
 259 #if I4BIPRACCT
 260                 sc->sc_if.if_timer = 0;
 261                 sc->sc_if.if_watchdog = iprwatchdog;
 262                 sc->sc_iinb = 0;
 263                 sc->sc_ioutb = 0;
 264                 sc->sc_inb = 0;
 265                 sc->sc_outb = 0;
 266                 sc->sc_linb = 0;
 267                 sc->sc_loutb = 0;
 268                 sc->sc_fn = 1;
 269 #endif
 270 #if IPR_LOG
 271                 sc->sc_log_first = IPR_LOG;
 272 #endif
 273
 274 #ifdef  IPR_VJ
 275                 sl_compress_init(&sc->sc_compr, -1);
 276
 277 #ifdef IPR_VJ_USEBUFFER
 278                 sc->sc_cbuf = (u_char *)kmalloc(I4BIPRMAXMTU+128, M_DEVBUF,
 279                     M_WAITOK);
 280 #endif
 281 #endif
 282                 sc->sc_updown = SOFT_ENA;       /* soft enabled */
 283                 sc->sc_dialresp = DSTAT_NONE;   /* no response */
 284                 sc->sc_lastdialresp = DSTAT_NONE;
 285
 286                 if_attach(&sc->sc_if, NULL);
 287                 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
 288         }
 289 }
 290
 291 /*---------------------------------------------------------------------------*
 292  *      output a packet to the ISDN B-channel
 293  *---------------------------------------------------------------------------*/
 294 static int
 295 i4biproutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 296          struct rtentry *rtp)
 297 {
 298         struct ipr_softc *sc;
 299         int unit;
 300         struct ip *ip;
 301
 302         crit_enter();
 303
 304         sc = ifp->if_softc;
 305         unit = sc->sc_unit;
 306
 307         /* check for IP */
 308
 309         if(dst->sa_family != AF_INET)
 310         {
 311                 kprintf(IPR_FMT "af%d not supported\n", IPR_ARG(sc), dst->sa_family);
 312                 m_freem(m);
 313                 crit_exit();
 314                 sc->sc_if.if_noproto++;
 315                 sc->sc_if.if_oerrors++;
 316                 return(EAFNOSUPPORT);
 317         }
 318
 319         /* check interface state = UP */
 320
 321         if(!(ifp->if_flags & IFF_UP))
 322         {
 323                 NDBGL4(L4_IPRDBG, "ipr%d: interface is DOWN!", unit);
 324                 m_freem(m);
 325                 crit_exit();
 326                 sc->sc_if.if_oerrors++;
 327                 return(ENETDOWN);
 328         }
 329
 330         /* dial if necessary */
 331
 332         if(sc->sc_state == ST_IDLE || sc->sc_state == ST_DIALING)
 333         {
 334
 335 #ifdef NOTDEF
 336                 switch(sc->sc_dialresp)
 337                 {
 338                         case DSTAT_TFAIL:       /* transient failure */
 339                                 NDBGL4(L4_IPRDBG, "ipr%d: transient dial failure!", unit);
 340                                 m_freem(m);
 341                                 iprclearqueues(sc);
 342                                 sc->sc_dialresp = DSTAT_NONE;
 343                                 crit_exit();
 344                                 sc->sc_if.if_oerrors++;
 345                                 return(ENETUNREACH);
 346                                 break;
 347
 348                         case DSTAT_PFAIL:       /* permanent failure */
 349                                 NDBGL4(L4_IPRDBG, "ipr%d: permanent dial failure!", unit);
 350                                 m_freem(m);
 351                                 iprclearqueues(sc);
 352                                 sc->sc_dialresp = DSTAT_NONE;
 353                                 crit_exit();
 354                                 sc->sc_if.if_oerrors++;
 355                                 return(EHOSTUNREACH);
 356                                 break;
 357
 358                         case DSTAT_INONLY:      /* no dialout allowed*/
 359                                 NDBGL4(L4_IPRDBG, "ipr%d: dialout not allowed failure!", unit);
 360                                 m_freem(m);
 361                                 iprclearqueues(sc);
 362                                 sc->sc_dialresp = DSTAT_NONE;
 363                                 crit_exit();
 364                                 sc->sc_if.if_oerrors++;
 365                                 return(EHOSTUNREACH);
 366                                 break;
 367                 }
 368 #endif
 369
 370                 NDBGL4(L4_IPRDBG, "ipr%d: send dial request message!", unit);
 371                 NDBGL4(L4_DIALST, "ipr%d: setting dial state to ST_DIALING", unit);
 372                 i4b_l4_dialout(BDRV_IPR, unit);
 373                 sc->sc_state = ST_DIALING;
 374         }
 375
 376 #if IPR_LOG
 377         if(sc->sc_log_first > 0)
 378         {
 379                 --(sc->sc_log_first);
 380                 i4b_l4_packet_ind(BDRV_IPR, unit, 1, m );
 381         }
 382 #endif
 383
 384         /* update access time */
 385
 386         microtime(&sc->sc_if.if_lastchange);
 387
 388         /*
 389          * check, if type of service indicates interactive, i.e. telnet,
 390          * traffic. in case it is interactive, put it into the fast queue,
 391          * else (i.e. ftp traffic) put it into the "normal" queue
 392          */
 393
 394         ip = mtod(m, struct ip *);              /* get ptr to ip header */
 395
 396         /* check for space in choosen send queue */
 397
 398         if (netisr_queue(NETISR_IP, m))
 399         {
 400                 NDBGL4(L4_IPRDBG, "ipr%d: send queue full!", unit);
 401                 crit_exit();
 402                 sc->sc_if.if_oerrors++;
 403                 return(ENOBUFS);
 404         }
 405
 406         NDBGL4(L4_IPRDBG, "ipr%d: add packet to send queue!", unit);
 407
 408         ipr_tx_queue_empty(unit);
 409
 410         crit_exit();
 411
 412         return (0);
 413 }
 414
 415 /*---------------------------------------------------------------------------*
 416  *      process ioctl
 417  *---------------------------------------------------------------------------*/
 418 static int
 419 i4biprioctl(struct ifnet *ifp, IOCTL_CMD_T cmd, caddr_t data, struct ucred *cr)
 420 {
 421         struct ipr_softc *sc = ifp->if_softc;
 422
 423         struct ifreq *ifr = (struct ifreq *)data;
 424         struct ifaddr *ifa = (struct ifaddr *)data;
 425         int error = 0;
 426
 427         crit_enter();
 428
 429         switch (cmd)
 430         {
 431                 case SIOCAIFADDR:       /* add interface address */
 432                 case SIOCSIFADDR:       /* set interface address */
 433                 case SIOCSIFDSTADDR:    /* set interface destination address */
 434                         if(ifa->ifa_addr->sa_family != AF_INET)
 435                                 error = EAFNOSUPPORT;
 436                         else
 437                                 sc->sc_if.if_flags |= IFF_UP;
 438                         microtime(&sc->sc_if.if_lastchange);
 439                         break;
 440
 441                 case SIOCSIFFLAGS:      /* set interface flags */
 442                         if(!(ifr->ifr_flags & IFF_UP))
 443                         {
 444                                 if(sc->sc_if.if_flags & IFF_RUNNING)
 445                                 {
 446                                         /* disconnect ISDN line */
 447                                         i4b_l4_drvrdisc(BDRV_IPR, sc->sc_unit);
 448                                         sc->sc_if.if_flags &= ~IFF_RUNNING;
 449                                 }
 450
 451                                 sc->sc_state = ST_IDLE;
 452
 453                                 /* empty queues */
 454
 455                                 iprclearqueues(sc);
 456                         }
 457
 458                         if(ifr->ifr_flags & IFF_DEBUG)
 459                         {
 460                                 /* enable debug messages */
 461                         }
 462
 463                         microtime(&sc->sc_if.if_lastchange);
 464                         break;
 465
 466                 case SIOCSIFMTU:        /* set interface MTU */
 467                         if(ifr->ifr_mtu > I4BIPRMAXMTU)
 468                                 error = EINVAL;
 469                         else if(ifr->ifr_mtu < I4BIPRMINMTU)
 470                                 error = EINVAL;
 471                         else
 472                         {
 473                                 ifp->if_mtu = ifr->ifr_mtu;
 474                                 microtime(&sc->sc_if.if_lastchange);
 475                         }
 476                         break;
 477
 478 #if 0
 479         /* not needed for FreeBSD, done in sl_compress_init() (-hm) */
 480
 481                         /* need to add an ioctl:        set VJ max slot ID
 482                          * #define IPRIOCSMAXCID        _IOW('I', XXX, int)
 483                          */
 484 #ifdef IPR_VJ
 485                 case IPRIOCSMAXCID:
 486                         {
 487                         struct thread *td = curthread;  /* XXX */
 488
 489                         if ((error = suser(td)) != 0)
 490                                 return (error);
 491                         sl_compress_setup(sc->sc_compr, *(int *)data);
 492                         }
 493                         break;
 494 #endif
 495 #endif
 496                 default:
 497                         error = EINVAL;
 498                         break;
 499         }
 500
 501         crit_exit();
 502
 503         return(error);
 504 }
 505
 506 /*---------------------------------------------------------------------------*
 507  *      clear the interface's send queues
 508  *---------------------------------------------------------------------------*/
 509 static void
 510 iprclearqueues(struct ipr_softc *sc)
 511 {
 512         struct mbuf *m;
 513
 514         for(;;)
 515         {
 516                 crit_enter();
 517                 IF_DEQUEUE(&sc->sc_fastq, m);
 518                 crit_exit();
 519                 if(m)
 520                         m_freem(m);
 521                 else
 522                         break;
 523         }
 524
 525         for(;;)
 526         {
 527                 crit_enter();
 528                 IF_DEQUEUE(&sc->sc_if.if_snd, m);
 529                 crit_exit();
 530                 if(m)
 531                         m_freem(m);
 532                 else
 533                         break;
 534         }
 535 }
 536
 537 #if I4BIPRACCT
 538 /*---------------------------------------------------------------------------*
 539  *      watchdog routine
 540  *---------------------------------------------------------------------------*/
 541 static void
 542 iprwatchdog(struct ifnet *ifp)
 543 {
 544         struct ipr_softc *sc = ifp->if_softc;
 545         int unit = sc->sc_unit;
 546         bchan_statistics_t bs;
 547
 548         /* get # of bytes in and out from the HSCX driver */
 549
 550         (*isdn_linktab[unit]->bch_stat)
 551                 (isdn_linktab[unit]->unit, isdn_linktab[unit]->channel, &bs);
 552
 553         sc->sc_ioutb += bs.outbytes;
 554         sc->sc_iinb += bs.inbytes;
 555
 556         if((sc->sc_iinb != sc->sc_linb) || (sc->sc_ioutb != sc->sc_loutb) || sc->sc_fn)
 557         {
 558                 int ri = (sc->sc_iinb - sc->sc_linb)/I4BIPRACCTINTVL;
 559                 int ro = (sc->sc_ioutb - sc->sc_loutb)/I4BIPRACCTINTVL;
 560
 561                 if((sc->sc_iinb == sc->sc_linb) && (sc->sc_ioutb == sc->sc_loutb))
 562                         sc->sc_fn = 0;
 563                 else
 564                         sc->sc_fn = 1;
 565
 566                 sc->sc_linb = sc->sc_iinb;
 567                 sc->sc_loutb = sc->sc_ioutb;
 568
 569                 i4b_l4_accounting(BDRV_IPR, unit, ACCT_DURING,
 570                          sc->sc_ioutb, sc->sc_iinb, ro, ri, sc->sc_outb, sc->sc_inb);
 571         }
 572         sc->sc_if.if_timer = I4BIPRACCTINTVL;
 573 }
 574 #endif /* I4BIPRACCT */
 575
 576 /*===========================================================================*
 577  *                      ISDN INTERFACE ROUTINES
 578  *===========================================================================*/
 579
 580 /*---------------------------------------------------------------------------*
 581  *      start transmitting after connect
 582  *---------------------------------------------------------------------------*/
 583 static void
 584 i4bipr_connect_startio(struct ipr_softc *sc)
 585 {
 586         crit_enter();
 587
 588         if(sc->sc_state == ST_CONNECTED_W)
 589         {
 590                 sc->sc_state = ST_CONNECTED_A;
 591                 ipr_tx_queue_empty(THE_UNIT);
 592         }
 593
 594         crit_exit();
 595 }
 596
 597 /*---------------------------------------------------------------------------*
 598  *      this routine is called from L4 handler at connect time
 599  *---------------------------------------------------------------------------*/
 600 static void
 601 ipr_connect(int unit, void *cdp)
 602 {
 603         struct ipr_softc *sc = &ipr_softc[unit];
 604
 605         sc->sc_cdp = (call_desc_t *)cdp;
 606
 607         crit_enter();
 608
 609         NDBGL4(L4_DIALST, "ipr%d: setting dial state to ST_CONNECTED", unit);
 610
 611         sc->sc_if.if_flags |= IFF_RUNNING;
 612         sc->sc_state = ST_CONNECTED_W;
 613
 614         sc->sc_dialresp = DSTAT_NONE;
 615         sc->sc_lastdialresp = DSTAT_NONE;
 616
 617 #if I4BIPRACCT
 618         sc->sc_iinb = 0;
 619         sc->sc_ioutb = 0;
 620         sc->sc_inb = 0;
 621         sc->sc_outb = 0;
 622         sc->sc_linb = 0;
 623         sc->sc_loutb = 0;
 624         sc->sc_if.if_timer = I4BIPRACCTINTVL;
 625 #endif
 626
 627 #ifdef I4BIPRADJFRXP
 628         sc->sc_first_pkt = 1;
 629 #endif
 630
 631         /*
 632          * Sometimes ISDN B-channels are switched thru asymmetic. This
 633          * means that under such circumstances B-channel data (the first
 634          * three packets of a TCP connection in my case) may get lost,
 635          * causing a large delay until the connection is started.
 636          * When the sending of the very first packet of a TCP connection
 637          * is delayed for a to be empirically determined delay (close
 638          * to a second in my case) those packets go thru and the TCP
 639          * connection comes up "almost" immediately (-hm).
 640          */
 641
 642         if(sc->sc_cdp->isdntxdelay > 0)
 643         {
 644                 int delay;
 645
 646                 if (hz == 100) {
 647                         delay = sc->sc_cdp->isdntxdelay;        /* avoid any rounding */
 648                 } else {
 649                         delay = sc->sc_cdp->isdntxdelay*hz;
 650                         delay /= 100;
 651                 }
 652
 653                 callout_reset(&sc->sc_timeout, delay,
 654                                 (TIMEOUT_FUNC_T)i4bipr_connect_startio, sc);
 655         }
 656         else
 657         {
 658                 sc->sc_state = ST_CONNECTED_A;
 659                 ipr_tx_queue_empty(unit);
 660         }
 661
 662         crit_exit();
 663
 664         /* we don't need any negotiation - pass event back right now */
 665         i4b_l4_negcomplete(sc->sc_cdp);
 666 }
 667
 668 /*---------------------------------------------------------------------------*
 669  *      this routine is called from L4 handler at disconnect time
 670  *---------------------------------------------------------------------------*/
 671 static void
 672 ipr_disconnect(int unit, void *cdp)
 673 {
 674         call_desc_t *cd = (call_desc_t *)cdp;
 675         struct ipr_softc *sc = &ipr_softc[unit];
 676
 677         /* new stuff to check that the active channel is being closed */
 678
 679         if (cd != sc->sc_cdp)
 680         {
 681                 NDBGL4(L4_IPRDBG, "ipr%d: channel %d not active",
 682                                 cd->driver_unit, cd->channelid);
 683                 return;
 684         }
 685
 686 #if I4BIPRACCT
 687         sc->sc_if.if_timer = 0;
 688 #endif
 689 #if IPR_LOG
 690         /* show next IPR_LOG packets again */
 691         sc->sc_log_first = IPR_LOG;
 692 #endif
 693
 694         i4b_l4_accounting(BDRV_IPR, cd->driver_unit, ACCT_FINAL,
 695                  sc->sc_ioutb, sc->sc_iinb, 0, 0, sc->sc_outb, sc->sc_inb);
 696
 697         sc->sc_cdp = (call_desc_t *)0;
 698
 699         NDBGL4(L4_DIALST, "setting dial state to ST_IDLE");
 700
 701         sc->sc_dialresp = DSTAT_NONE;
 702         sc->sc_lastdialresp = DSTAT_NONE;
 703
 704         sc->sc_if.if_flags &= ~IFF_RUNNING;
 705         sc->sc_state = ST_IDLE;
 706 }
 707
 708 /*---------------------------------------------------------------------------*
 709  *      this routine is used to give a feedback from userland daemon
 710  *      in case of dial problems
 711  *---------------------------------------------------------------------------*/
 712 static void
 713 ipr_dialresponse(int unit, int status, cause_t cause)
 714 {
 715         struct ipr_softc *sc = &ipr_softc[unit];
 716         sc->sc_dialresp = status;
 717
 718         NDBGL4(L4_IPRDBG, "ipr%d: last=%d, this=%d",
 719                 unit, sc->sc_lastdialresp, sc->sc_dialresp);
 720
 721         if(status != DSTAT_NONE)
 722         {
 723                 NDBGL4(L4_IPRDBG, "ipr%d: clearing queues", unit);
 724                 iprclearqueues(sc);
 725         }
 726 }
 727
 728 /*---------------------------------------------------------------------------*
 729  *      interface soft up/down
 730  *---------------------------------------------------------------------------*/
 731 static void
 732 ipr_updown(int unit, int updown)
 733 {
 734         struct ipr_softc *sc = &ipr_softc[unit];
 735         sc->sc_updown = updown;
 736 }
 737
 738 /*---------------------------------------------------------------------------*
 739  *      this routine is called from the HSCX interrupt handler
 740  *      when a new frame (mbuf) has been received and was put on
 741  *      the rx queue. It is assumed that this routines runs in
 742  *      a critical section ! Keep it short !
 743  *---------------------------------------------------------------------------*/
 744 static void
 745 ipr_rx_data_rdy(int unit)
 746 {
 747         struct ipr_softc *sc = &ipr_softc[unit];
 748         struct mbuf *m;
 749 #ifdef IPR_VJ
 750 #ifdef IPR_VJ_USEBUFFER
 751         u_char *cp = sc->sc_cbuf;
 752 #endif
 753         int len, c;
 754 #endif
 755         static const uint32_t af = AF_INET;
 756
 757         if((m = *isdn_linktab[unit]->rx_mbuf) == NULL)
 758                 return;
 759
 760         m->m_pkthdr.rcvif = &sc->sc_if;
 761
 762         m->m_pkthdr.len = m->m_len;
 763
 764         microtime(&sc->sc_if.if_lastchange);
 765
 766 #ifdef I4BIPRADJFRXP
 767
 768         /*
 769          * The very first packet after the B channel is switched thru
 770          * has very often several bytes of random data prepended. This
 771          * routine looks where the IP header starts and removes the
 772          * the bad data.
 773          */
 774
 775         if(sc->sc_first_pkt)
 776         {
 777                 unsigned char *mp = m->m_data;
 778                 int i;
 779
 780                 sc->sc_first_pkt = 0;
 781
 782                 for(i = 0; i < m->m_len; i++, mp++)
 783                 {
 784                         if( ((*mp & 0xf0) == 0x40) &&
 785                             ((*mp & 0x0f) >= 0x05) )
 786                         {
 787                                 m->m_data = mp;
 788                                 m->m_pkthdr.len -= i;
 789                                 break;
 790                         }
 791                 }
 792         }
 793 #endif
 794
 795         sc->sc_if.if_ipackets++;
 796         sc->sc_if.if_ibytes += m->m_pkthdr.len;
 797
 798 #ifdef  IPR_VJ
 799         if((c = (*(mtod(m, u_char *)) & 0xf0)) != (IPVERSION << 4))
 800         {
 801                 /* copy data to buffer */
 802
 803                 len = m->m_len;
 804
 805 #ifdef IPR_VJ_USEBUFFER
 806 /* XXX */       m_copydata(m, 0, len, cp);
 807 #endif
 808
 809                 if(c & 0x80)
 810                 {
 811                         c = TYPE_COMPRESSED_TCP;
 812                 }
 813                 else if(c == TYPE_UNCOMPRESSED_TCP)
 814                 {
 815 #ifdef IPR_VJ_USEBUFFER
 816                         *cp &= 0x4f;            /* XXX */
 817 #else
 818                         *(mtod(m, u_char *)) &= 0x4f;
 819 #endif
 820                 }
 821
 822                 /*
 823                  * We've got something that's not an IP packet.
 824                  * If compression is enabled, try to decompress it.
 825                  * Otherwise, if `auto-enable' compression is on and
 826                  * it's a reasonable packet, decompress it and then
 827                  * enable compression.  Otherwise, drop it.
 828                  */
 829                 if(sc->sc_if.if_flags & IPR_COMPRESS)
 830                 {
 831 #ifdef IPR_VJ_USEBUFFER
 832                         len = sl_uncompress_tcp(&cp,len,(u_int)c,&sc->sc_compr);
 833 #else
 834                         len = sl_uncompress_tcp((u_char **)&m->m_data, len,
 835                                         (u_int)c, &sc->sc_compr);
 836 #endif
 837
 838                         if(len <= 0)
 839                         {
 840 #ifdef DEBUG_IPR_VJ
 841                                 kprintf("i4b_ipr, ipr_rx_data_rdy: len <= 0 IPR_COMPRESS!\n");
 842 #endif
 843                                 goto error;
 844                         }
 845                 }
 846                 else if((sc->sc_if.if_flags & IPR_AUTOCOMP) &&
 847                         (c == TYPE_UNCOMPRESSED_TCP) && (len >= 40))
 848                 {
 849 #ifdef IPR_VJ_USEBUFFER
 850                         len = sl_uncompress_tcp(&cp,len,(u_int)c,&sc->sc_compr);
 851 #else
 852                         len = sl_uncompress_tcp((u_char **)&m->m_data, len,
 853                                         (u_int)c, &sc->sc_compr);
 854 #endif
 855
 856                         if(len <= 0)
 857                         {
 858 #ifdef DEBUG_IPR_VJ
 859                                 kprintf("i4b_ipr, ipr_rx_data_rdy: len <= 0 IPR_AUTOCOMP!\n");
 860 #endif
 861                                 goto error;
 862                         }
 863
 864                         sc->sc_if.if_flags |= IPR_COMPRESS;
 865                 }
 866                 else
 867                 {
 868 #ifdef DEBUG_IPR_VJ
 869                         kprintf("i4b_ipr, ipr_input: invalid ip packet!\n");
 870 #endif
 871
 872 error:
 873                         sc->sc_if.if_ierrors++;
 874                         sc->sc_if.if_collisions++;
 875                         m_freem(m);
 876                         return;
 877                 }
 878 #ifdef IPR_VJ_USEBUFFER
 879 /* XXX */       m_copyback(m, 0, len, cp);
 880 #else
 881                 m->m_len = m->m_pkthdr.len = len;
 882 #endif
 883         }
 884 #endif
 885
 886 #if I4BIPRACCT
 887         /* NB. do the accounting after decompression!           */
 888         sc->sc_inb += m->m_pkthdr.len;
 889 #endif
 890 #if IPR_LOG
 891         if(sc->sc_log_first > 0)
 892         {
 893                 --(sc->sc_log_first);
 894                 i4b_l4_packet_ind(BDRV_IPR, unit, 0, m );
 895         }
 896 #endif
 897
 898         if (sc->sc_if.if_bpf)
 899                 bpf_ptap(sc->sc_if.if_bpf, m, &af, sizeof(af));
 900
 901         if (netisr_queue(NETISR_IP, m)) {
 902                 NDBGL4(L4_IPRDBG, "ipr%d: ipintrq full!", unit);
 903                 sc->sc_if.if_ierrors++;
 904                 sc->sc_if.if_iqdrops++;
 905         }
 906 }
 907
 908 /*---------------------------------------------------------------------------*
 909  *      this routine is called from the HSCX interrupt handler
 910  *      when the last frame has been sent out and there is no
 911  *      further frame (mbuf) in the tx queue.
 912  *---------------------------------------------------------------------------*/
 913 static void
 914 ipr_tx_queue_empty(int unit)
 915 {
 916         static const uint32_t af = AF_INET;
 917         struct ipr_softc *sc = &ipr_softc[unit];
 918         struct mbuf *m;
 919 #ifdef  IPR_VJ
 920         struct ip *ip;
 921 #endif
 922         int x = 0;
 923
 924         if(sc->sc_state != ST_CONNECTED_A)
 925                 return;
 926
 927         for(;;)
 928         {
 929                 IF_DEQUEUE(&sc->sc_fastq, m);
 930                 if(m)
 931                 {
 932                         sc->sc_if.if_omcasts++;
 933                 }
 934                 else
 935                 {
 936                         IF_DEQUEUE(&sc->sc_if.if_snd, m);
 937                         if(m == NULL)
 938                                 break;
 939                 }
 940
 941                 microtime(&sc->sc_if.if_lastchange);
 942
 943                 if (sc->sc_if.if_bpf)
 944                         bpf_ptap(sc->sc_if.if_bpf, m, &af, sizeof(af));
 945
 946 #if I4BIPRACCT
 947                 sc->sc_outb += m->m_pkthdr.len; /* size before compression */
 948 #endif
 949
 950 #ifdef  IPR_VJ
 951                 if((ip = mtod(m, struct ip *))->ip_p == IPPROTO_TCP)
 952                 {
 953                         if(sc->sc_if.if_flags & IPR_COMPRESS)
 954                         {
 955                                 *mtod(m, u_char *) |= sl_compress_tcp(m, ip,
 956                                         &sc->sc_compr, 1);
 957                         }
 958                 }
 959 #endif
 960                 x = 1;
 961
 962                 if(IF_QFULL(isdn_linktab[unit]->tx_queue))
 963                 {
 964                         NDBGL4(L4_IPRDBG, "ipr%d: tx queue full!", unit);
 965                         m_freem(m);
 966                 }
 967                 else
 968                 {
 969                         sc->sc_if.if_obytes += m->m_pkthdr.len;
 970
 971                         sc->sc_if.if_opackets++;
 972
 973                         IF_ENQUEUE(isdn_linktab[unit]->tx_queue, m);
 974
 975                 }
 976         }
 977
 978         if(x)
 979                 (*isdn_linktab[unit]->bch_tx_start)(isdn_linktab[unit]->unit, isdn_linktab[unit]->channel);
 980 }
 981
 982 /*---------------------------------------------------------------------------*
 983  *      this routine is called from the HSCX interrupt handler
 984  *      each time a packet is received or transmitted. It should
 985  *      be used to implement an activity timeout mechanism.
 986  *---------------------------------------------------------------------------*/
 987 static void
 988 ipr_activity(int unit, int rxtx)
 989 {
 990         ipr_softc[unit].sc_cdp->last_active_time = SECOND;
 991 }
 992
 993 /*---------------------------------------------------------------------------*
 994  *      return this drivers linktab address
 995  *---------------------------------------------------------------------------*/
 996 drvr_link_t *
 997 ipr_ret_linktab(int unit)
 998 {
 999         return(&ipr_drvr_linktab[unit]);
1000 }
1001
1002 /*---------------------------------------------------------------------------*
1003  *      setup the isdn_linktab for this driver
1004  *---------------------------------------------------------------------------*/
1005 void
1006 ipr_set_linktab(int unit, isdn_link_t *ilt)
1007 {
1008         isdn_linktab[unit] = ilt;
1009 }
1010
1011 /*---------------------------------------------------------------------------*
1012  *      initialize this drivers linktab
1013  *---------------------------------------------------------------------------*/
1014 static void
1015 ipr_init_linktab(int unit)
1016 {
1017         ipr_drvr_linktab[unit].unit = unit;
1018         ipr_drvr_linktab[unit].bch_rx_data_ready = ipr_rx_data_rdy;
1019         ipr_drvr_linktab[unit].bch_tx_queue_empty = ipr_tx_queue_empty;
1020         ipr_drvr_linktab[unit].bch_activity = ipr_activity;
1021         ipr_drvr_linktab[unit].line_connected = ipr_connect;
1022         ipr_drvr_linktab[unit].line_disconnected = ipr_disconnect;
1023         ipr_drvr_linktab[unit].dial_response = ipr_dialresponse;
1024         ipr_drvr_linktab[unit].updown_ind = ipr_updown;
1025 }
1026
1027 /*===========================================================================*/
1028
1029 #endif /* NI4BIPR > 0 */