net/irda/irlap_frame.c

   1 /*********************************************************************
   2  *
   3  * Filename:      irlap_frame.c
   4  * Version:       1.0
   5  * Description:   Build and transmit IrLAP frames
   6  * Status:        Stable
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Tue Aug 19 10:27:26 1997
   9  * Modified at:   Wed Jan  5 08:59:04 2000
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>,
  13  *     All Rights Reserved.
  14  *     Copyright (c) 2000-2001 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  22  *     provide warranty for any of this software. This material is
  23  *     provided "AS-IS" and at no charge.
  24  *
  25  ********************************************************************/
  26
  27 #include <linux/skbuff.h>
  28 #include <linux/if.h>
  29 #include <linux/if_ether.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/irda.h>
  32
  33 #include <net/pkt_sched.h>
  34 #include <net/sock.h>
  35
  36 #include <asm/byteorder.h>
  37
  38 #include <net/irda/irda.h>
  39 #include <net/irda/irda_device.h>
  40 #include <net/irda/irlap.h>
  41 #include <net/irda/wrapper.h>
  42 #include <net/irda/timer.h>
  43 #include <net/irda/irlap_frame.h>
  44 #include <net/irda/qos.h>
  45
  46 /*
  47  * Function irlap_insert_info (self, skb)
  48  *
  49  *    Insert minimum turnaround time and speed information into the skb. We
  50  *    need to do this since it's per packet relevant information. Safe to
  51  *    have this function inlined since it's only called from one place
  52  */
  53 static inline void irlap_insert_info(struct irlap_cb *self,
  54                                      struct sk_buff *skb)
  55 {
  56         struct irda_skb_cb *cb = (struct irda_skb_cb *) skb->cb;
  57
  58         /*
  59          * Insert MTT (min. turn time) and speed into skb, so that the
  60          * device driver knows which settings to use
  61          */
  62         cb->magic = LAP_MAGIC;
  63         cb->mtt = self->mtt_required;
  64         cb->next_speed = self->speed;
  65
  66         /* Reset */
  67         self->mtt_required = 0;
  68
  69         /*
  70          * Delay equals negotiated BOFs count, plus the number of BOFs to
  71          * force the negotiated minimum turnaround time
  72          */
  73         cb->xbofs = self->bofs_count;
  74         cb->next_xbofs = self->next_bofs;
  75         cb->xbofs_delay = self->xbofs_delay;
  76
  77         /* Reset XBOF's delay (used only for getting min turn time) */
  78         self->xbofs_delay = 0;
  79         /* Put the correct xbofs value for the next packet */
  80         self->bofs_count = self->next_bofs;
  81 }
  82
  83 /*
  84  * Function irlap_queue_xmit (self, skb)
  85  *
  86  *    A little wrapper for dev_queue_xmit, so we can insert some common
  87  *    code into it.
  88  */
  89 void irlap_queue_xmit(struct irlap_cb *self, struct sk_buff *skb)
  90 {
  91         /* Some common init stuff */
  92         skb->dev = self->netdev;
  93         skb->h.raw = skb->nh.raw = skb->mac.raw = skb->data;
  94         skb->protocol = htons(ETH_P_IRDA);
  95         skb->priority = TC_PRIO_BESTEFFORT;
  96
  97         irlap_insert_info(self, skb);
  98
  99         dev_queue_xmit(skb);
 100 }
 101
 102 /*
 103  * Function irlap_send_snrm_cmd (void)
 104  *
 105  *    Transmits a connect SNRM command frame
 106  */
 107 void irlap_send_snrm_frame(struct irlap_cb *self, struct qos_info *qos)
 108 {
 109         struct sk_buff *skb;
 110         struct snrm_frame *frame;
 111         int ret;
 112
 113         ASSERT(self != NULL, return;);
 114         ASSERT(self->magic == LAP_MAGIC, return;);
 115
 116         /* Allocate frame */
 117         skb = dev_alloc_skb(64);
 118         if (!skb)
 119                 return;
 120
 121         frame = (struct snrm_frame *) skb_put(skb, 2);
 122
 123         /* Insert connection address field */
 124         if (qos)
 125                 frame->caddr = CMD_FRAME | CBROADCAST;
 126         else
 127                 frame->caddr = CMD_FRAME | self->caddr;
 128
 129         /* Insert control field */
 130         frame->control = SNRM_CMD | PF_BIT;
 131
 132         /*
 133          *  If we are establishing a connection then insert QoS paramerters
 134          */
 135         if (qos) {
 136                 skb_put(skb, 9); /* 21 left */
 137                 frame->saddr = cpu_to_le32(self->saddr);
 138                 frame->daddr = cpu_to_le32(self->daddr);
 139
 140                 frame->ncaddr = self->caddr;
 141
 142                 ret = irlap_insert_qos_negotiation_params(self, skb);
 143                 if (ret < 0) {
 144                         dev_kfree_skb(skb);
 145                         return;
 146                 }
 147         }
 148         irlap_queue_xmit(self, skb);
 149 }
 150
 151 /*
 152  * Function irlap_recv_snrm_cmd (skb, info)
 153  *
 154  *    Received SNRM (Set Normal Response Mode) command frame
 155  *
 156  */
 157 static void irlap_recv_snrm_cmd(struct irlap_cb *self, struct sk_buff *skb,
 158                                 struct irlap_info *info)
 159 {
 160         struct snrm_frame *frame;
 161
 162         frame = (struct snrm_frame *) skb->data;
 163
 164         if (skb->len >= sizeof(struct snrm_frame)) {
 165                 /* Copy the new connection address ignoring the C/R bit */
 166                 info->caddr = frame->ncaddr & 0xFE;
 167
 168                 /* Check if the new connection address is valid */
 169                 if ((info->caddr == 0x00) || (info->caddr == 0xfe)) {
 170                         IRDA_DEBUG(3, "%s(), invalid connection address!\n", __FUNCTION__);
 171                         return;
 172                 }
 173
 174                 /* Copy peer device address */
 175                 info->daddr = le32_to_cpu(frame->saddr);
 176                 info->saddr = le32_to_cpu(frame->daddr);
 177
 178                 /* Only accept if addressed directly to us */
 179                 if (info->saddr != self->saddr) {
 180                         IRDA_DEBUG(2, "%s(), not addressed to us!\n", __FUNCTION__);
 181                         return;
 182                 }
 183                 irlap_do_event(self, RECV_SNRM_CMD, skb, info);
 184         } else {
 185                 /* Signal that this SNRM frame does not contain and I-field */
 186                 irlap_do_event(self, RECV_SNRM_CMD, skb, NULL);
 187         }
 188 }
 189
 190 /*
 191  * Function irlap_send_ua_response_frame (qos)
 192  *
 193  *    Send UA (Unnumbered Acknowledgement) frame
 194  *
 195  */
 196 void irlap_send_ua_response_frame(struct irlap_cb *self, struct qos_info *qos)
 197 {
 198         struct sk_buff *skb;
 199         struct ua_frame *frame;
 200         int ret;
 201
 202         IRDA_DEBUG(2, "%s() <%ld>\n", __FUNCTION__, jiffies);
 203
 204         ASSERT(self != NULL, return;);
 205         ASSERT(self->magic == LAP_MAGIC, return;);
 206
 207         skb = NULL;
 208
 209         /* Allocate frame */
 210         skb = dev_alloc_skb(64);
 211         if (!skb)
 212                 return;
 213
 214         frame = (struct ua_frame *) skb_put(skb, 10);
 215
 216         /* Build UA response */
 217         frame->caddr = self->caddr;
 218         frame->control = UA_RSP | PF_BIT;
 219
 220         frame->saddr = cpu_to_le32(self->saddr);
 221         frame->daddr = cpu_to_le32(self->daddr);
 222
 223         /* Should we send QoS negotiation parameters? */
 224         if (qos) {
 225                 ret = irlap_insert_qos_negotiation_params(self, skb);
 226                 if (ret < 0) {
 227                         dev_kfree_skb(skb);
 228                         return;
 229                 }
 230         }
 231
 232         irlap_queue_xmit(self, skb);
 233 }
 234
 235
 236 /*
 237  * Function irlap_send_dm_frame (void)
 238  *
 239  *    Send disconnected mode (DM) frame
 240  *
 241  */
 242 void irlap_send_dm_frame( struct irlap_cb *self)
 243 {
 244         struct sk_buff *skb = NULL;
 245         __u8 *frame;
 246
 247         ASSERT(self != NULL, return;);
 248         ASSERT(self->magic == LAP_MAGIC, return;);
 249
 250         skb = dev_alloc_skb(32);
 251         if (!skb)
 252                 return;
 253
 254         frame = skb_put( skb, 2);
 255
 256         if (self->state == LAP_NDM)
 257                 frame[0] = CBROADCAST;
 258         else
 259                 frame[0] = self->caddr;
 260
 261         frame[1] = DM_RSP | PF_BIT;
 262
 263         irlap_queue_xmit(self, skb);
 264 }
 265
 266 /*
 267  * Function irlap_send_disc_frame (void)
 268  *
 269  *    Send disconnect (DISC) frame
 270  *
 271  */
 272 void irlap_send_disc_frame(struct irlap_cb *self)
 273 {
 274         struct sk_buff *skb = NULL;
 275         __u8 *frame;
 276
 277         IRDA_DEBUG(3, "%s()\n", __FUNCTION__);
 278
 279         ASSERT(self != NULL, return;);
 280         ASSERT(self->magic == LAP_MAGIC, return;);
 281
 282         skb = dev_alloc_skb(16);
 283         if (!skb)
 284                 return;
 285
 286         frame = skb_put(skb, 2);
 287
 288         frame[0] = self->caddr | CMD_FRAME;
 289         frame[1] = DISC_CMD | PF_BIT;
 290
 291         irlap_queue_xmit(self, skb);
 292 }
 293
 294 /*
 295  * Function irlap_send_discovery_xid_frame (S, s, command)
 296  *
 297  *    Build and transmit a XID (eXchange station IDentifier) discovery
 298  *    frame.
 299  */
 300 void irlap_send_discovery_xid_frame(struct irlap_cb *self, int S, __u8 s,
 301                                     __u8 command, discovery_t *discovery)
 302 {
 303         struct sk_buff *skb = NULL;
 304         struct xid_frame *frame;
 305         __u32 bcast = BROADCAST;
 306         __u8 *info;
 307
 308         IRDA_DEBUG(4, "%s(), s=%d, S=%d, command=%d\n", __FUNCTION__, s, S,
 309                    command);
 310
 311         ASSERT(self != NULL, return;);
 312         ASSERT(self->magic == LAP_MAGIC, return;);
 313         ASSERT(discovery != NULL, return;);
 314
 315         skb = dev_alloc_skb(64);
 316         if (!skb)
 317                 return;
 318
 319         skb_put(skb, 14);
 320         frame = (struct xid_frame *) skb->data;
 321
 322         if (command) {
 323                 frame->caddr = CBROADCAST | CMD_FRAME;
 324                 frame->control =  XID_CMD | PF_BIT;
 325         } else {
 326                 frame->caddr = CBROADCAST;
 327                 frame->control =  XID_RSP | PF_BIT;
 328         }
 329         frame->ident = XID_FORMAT;
 330
 331         frame->saddr = cpu_to_le32(self->saddr);
 332
 333         if (command)
 334                 frame->daddr = cpu_to_le32(bcast);
 335         else
 336                 frame->daddr = cpu_to_le32(discovery->daddr);
 337
 338         switch (S) {
 339         case 1:
 340                 frame->flags = 0x00;
 341                 break;
 342         case 6:
 343                 frame->flags = 0x01;
 344                 break;
 345         case 8:
 346                 frame->flags = 0x02;
 347                 break;
 348         case 16:
 349                 frame->flags = 0x03;
 350                 break;
 351         default:
 352                 frame->flags = 0x02;
 353                 break;
 354         }
 355
 356         frame->slotnr = s;
 357         frame->version = 0x00;
 358
 359         /*
 360          *  Provide info for final slot only in commands, and for all
 361          *  responses. Send the second byte of the hint only if the
 362          *  EXTENSION bit is set in the first byte.
 363          */
 364         if (!command || (frame->slotnr == 0xff)) {
 365                 int len;
 366
 367                 if (discovery->hints.byte[0] & HINT_EXTENSION) {
 368                         info = skb_put(skb, 2);
 369                         info[0] = discovery->hints.byte[0];
 370                         info[1] = discovery->hints.byte[1];
 371                 } else {
 372                         info = skb_put(skb, 1);
 373                         info[0] = discovery->hints.byte[0];
 374                 }
 375                 info = skb_put(skb, 1);
 376                 info[0] = discovery->charset;
 377
 378                 len = IRDA_MIN(discovery->name_len, skb_tailroom(skb));
 379                 info = skb_put(skb, len);
 380                 memcpy(info, discovery->nickname, len);
 381         }
 382         irlap_queue_xmit(self, skb);
 383 }
 384
 385 /*
 386  * Function irlap_recv_discovery_xid_rsp (skb, info)
 387  *
 388  *    Received a XID discovery response
 389  *
 390  */
 391 static void irlap_recv_discovery_xid_rsp(struct irlap_cb *self,
 392                                          struct sk_buff *skb,
 393                                          struct irlap_info *info)
 394 {
 395         struct xid_frame *xid;
 396         discovery_t *discovery = NULL;
 397         __u8 *discovery_info;
 398         char *text;
 399
 400         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
 401
 402         ASSERT(self != NULL, return;);
 403         ASSERT(self->magic == LAP_MAGIC, return;);
 404
 405         xid = (struct xid_frame *) skb->data;
 406
 407         info->daddr = le32_to_cpu(xid->saddr);
 408         info->saddr = le32_to_cpu(xid->daddr);
 409
 410         /* Make sure frame is addressed to us */
 411         if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) {
 412                 IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n", __FUNCTION__);
 413                 return;
 414         }
 415
 416         if ((discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC)) == NULL) {
 417                 WARNING("%s(), kmalloc failed!\n", __FUNCTION__);
 418                 return;
 419         }
 420         memset(discovery, 0, sizeof(discovery_t));
 421
 422         discovery->daddr = info->daddr;
 423         discovery->saddr = self->saddr;
 424         discovery->timestamp = jiffies;
 425
 426         IRDA_DEBUG(4, "%s(), daddr=%08x\n", __FUNCTION__, discovery->daddr);
 427
 428         discovery_info = skb_pull(skb, sizeof(struct xid_frame));
 429
 430         /* Get info returned from peer */
 431         discovery->hints.byte[0] = discovery_info[0];
 432         if (discovery_info[0] & HINT_EXTENSION) {
 433                 IRDA_DEBUG(4, "EXTENSION\n");
 434                 discovery->hints.byte[1] = discovery_info[1];
 435                 discovery->charset = discovery_info[2];
 436                 text = (char *) &discovery_info[3];
 437         } else {
 438                 discovery->hints.byte[1] = 0;
 439                 discovery->charset = discovery_info[1];
 440                 text = (char *) &discovery_info[2];
 441         }
 442         /*
 443          *  Terminate info string, should be safe since this is where the
 444          *  FCS bytes resides.
 445          */
 446         skb->data[skb->len] = '\0';
 447         strncpy(discovery->nickname, text, NICKNAME_MAX_LEN);
 448         discovery->name_len = strlen(discovery->nickname);
 449
 450         info->discovery = discovery;
 451
 452         irlap_do_event(self, RECV_DISCOVERY_XID_RSP, skb, info);
 453 }
 454
 455 /*
 456  * Function irlap_recv_discovery_xid_cmd (skb, info)
 457  *
 458  *    Received a XID discovery command
 459  *
 460  */
 461 static void irlap_recv_discovery_xid_cmd(struct irlap_cb *self,
 462                                          struct sk_buff *skb,
 463                                          struct irlap_info *info)
 464 {
 465         struct xid_frame *xid;
 466         discovery_t *discovery = NULL;
 467         __u8 *discovery_info;
 468         char *text;
 469
 470         xid = (struct xid_frame *) skb->data;
 471
 472         info->daddr = le32_to_cpu(xid->saddr);
 473         info->saddr = le32_to_cpu(xid->daddr);
 474
 475         /* Make sure frame is addressed to us */
 476         if ((info->saddr != self->saddr) && (info->saddr != BROADCAST)) {
 477                 IRDA_DEBUG(0, "%s(), frame is not addressed to us!\n", __FUNCTION__);
 478                 return;
 479         }
 480
 481         switch (xid->flags & 0x03) {
 482         case 0x00:
 483                 info->S = 1;
 484                 break;
 485         case 0x01:
 486                 info->S = 6;
 487                 break;
 488         case 0x02:
 489                 info->S = 8;
 490                 break;
 491         case 0x03:
 492                 info->S = 16;
 493                 break;
 494         default:
 495                 /* Error!! */
 496                 dev_kfree_skb(skb);
 497                 return;
 498         }
 499         info->s = xid->slotnr;
 500
 501         discovery_info = skb_pull(skb, sizeof(struct xid_frame));
 502
 503         /*
 504          *  Check if last frame
 505          */
 506         if (info->s == 0xff) {
 507                 /* Check if things are sane at this point... */
 508                 if((discovery_info == NULL) || (skb->len < 3)) {
 509                         ERROR("%s(), discovery frame to short!\n", __FUNCTION__);
 510                         return;
 511                 }
 512
 513                 /*
 514                  *  We now have some discovery info to deliver!
 515                  */
 516                 discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC);
 517                 if (!discovery) {
 518                         WARNING("%s(), unable to malloc!\n", __FUNCTION__);
 519                         return;
 520                 }
 521
 522                 discovery->daddr = info->daddr;
 523                 discovery->saddr = self->saddr;
 524                 discovery->timestamp = jiffies;
 525
 526                 discovery->hints.byte[0] = discovery_info[0];
 527                 if (discovery_info[0] & HINT_EXTENSION) {
 528                         discovery->hints.byte[1] = discovery_info[1];
 529                         discovery->charset = discovery_info[2];
 530                         text = (char *) &discovery_info[3];
 531                 } else {
 532                         discovery->hints.byte[1] = 0;
 533                         discovery->charset = discovery_info[1];
 534                         text = (char *) &discovery_info[2];
 535                 }
 536                 /*
 537                  *  Terminate string, should be safe since this is where the
 538                  *  FCS bytes resides.
 539                  */
 540                 skb->data[skb->len] = '\0';
 541                 strncpy(discovery->nickname, text, NICKNAME_MAX_LEN);
 542                 discovery->name_len = strlen(discovery->nickname);
 543
 544                 info->discovery = discovery;
 545         } else
 546                 info->discovery = NULL;
 547
 548         irlap_do_event(self, RECV_DISCOVERY_XID_CMD, skb, info);
 549 }
 550
 551 /*
 552  * Function irlap_send_rr_frame (self, command)
 553  *
 554  *    Build and transmit RR (Receive Ready) frame. Notice that it is currently
 555  *    only possible to send RR frames with the poll bit set.
 556  */
 557 void irlap_send_rr_frame(struct irlap_cb *self, int command)
 558 {
 559         struct sk_buff *skb;
 560         __u8 *frame;
 561
 562         skb = dev_alloc_skb(16);
 563         if (!skb)
 564                 return;
 565
 566         frame = skb_put(skb, 2);
 567
 568         frame[0] = self->caddr;
 569         frame[0] |= (command) ? CMD_FRAME : 0;
 570
 571         frame[1] = RR | PF_BIT | (self->vr << 5);
 572
 573         irlap_queue_xmit(self, skb);
 574 }
 575
 576 /*
 577  * Function irlap_send_rd_frame (self)
 578  *
 579  *    Request disconnect. Used by a secondary station to request the
 580  *    disconnection of the link.
 581  */
 582 void irlap_send_rd_frame(struct irlap_cb *self)
 583 {
 584         struct sk_buff *skb;
 585         __u8 *frame;
 586
 587         skb = dev_alloc_skb(16);
 588         if (!skb)
 589                 return;
 590
 591         frame = skb_put(skb, 2);
 592
 593         frame[0] = self->caddr;
 594         frame[1] = RD_RSP | PF_BIT;
 595
 596         irlap_queue_xmit(self, skb);
 597 }
 598
 599 /*
 600  * Function irlap_recv_rr_frame (skb, info)
 601  *
 602  *    Received RR (Receive Ready) frame from peer station, no harm in
 603  *    making it inline since its called only from one single place
 604  *    (irlap_driver_rcv).
 605  */
 606 static inline void irlap_recv_rr_frame(struct irlap_cb *self,
 607                                        struct sk_buff *skb,
 608                                        struct irlap_info *info, int command)
 609 {
 610         info->nr = skb->data[1] >> 5;
 611
 612         /* Check if this is a command or a response frame */
 613         if (command)
 614                 irlap_do_event(self, RECV_RR_CMD, skb, info);
 615         else
 616                 irlap_do_event(self, RECV_RR_RSP, skb, info);
 617 }
 618
 619 void irlap_send_frmr_frame( struct irlap_cb *self, int command)
 620 {
 621         struct sk_buff *skb = NULL;
 622         __u8 *frame;
 623
 624         ASSERT( self != NULL, return;);
 625         ASSERT( self->magic == LAP_MAGIC, return;);
 626
 627         skb = dev_alloc_skb( 32);
 628         if (!skb)
 629                 return;
 630
 631         frame = skb_put( skb, 2);
 632
 633         frame[0] = self->caddr;
 634         frame[0] |= (command) ? CMD_FRAME : 0;
 635
 636         frame[1]  = (self->vs << 1);
 637         frame[1] |= PF_BIT;
 638         frame[1] |= (self->vr << 5);
 639
 640         frame[2] = 0;
 641
 642         IRDA_DEBUG(4, "%s(), vr=%d, %ld\n", __FUNCTION__, self->vr, jiffies);
 643
 644         irlap_queue_xmit(self, skb);
 645 }
 646
 647 /*
 648  * Function irlap_recv_rnr_frame (self, skb, info)
 649  *
 650  *    Received RNR (Receive Not Ready) frame from peer station
 651  *
 652  */
 653 static void irlap_recv_rnr_frame(struct irlap_cb *self, struct sk_buff *skb,
 654                                  struct irlap_info *info, int command)
 655 {
 656         info->nr = skb->data[1] >> 5;
 657
 658         IRDA_DEBUG(4, "%s(), nr=%d, %ld\n", __FUNCTION__, info->nr, jiffies);
 659
 660         if (command)
 661                 irlap_do_event(self, RECV_RNR_CMD, skb, info);
 662         else
 663                 irlap_do_event(self, RECV_RNR_RSP, skb, info);
 664 }
 665
 666 static void irlap_recv_rej_frame(struct irlap_cb *self, struct sk_buff *skb,
 667                                  struct irlap_info *info, int command)
 668 {
 669         IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
 670
 671         info->nr = skb->data[1] >> 5;
 672
 673         /* Check if this is a command or a response frame */
 674         if (command)
 675                 irlap_do_event(self, RECV_REJ_CMD, skb, info);
 676         else
 677                 irlap_do_event(self, RECV_REJ_RSP, skb, info);
 678 }
 679
 680 static void irlap_recv_srej_frame(struct irlap_cb *self, struct sk_buff *skb,
 681                                   struct irlap_info *info, int command)
 682 {
 683         IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
 684
 685         info->nr = skb->data[1] >> 5;
 686
 687         /* Check if this is a command or a response frame */
 688         if (command)
 689                 irlap_do_event(self, RECV_SREJ_CMD, skb, info);
 690         else
 691                 irlap_do_event(self, RECV_SREJ_RSP, skb, info);
 692 }
 693
 694 static void irlap_recv_disc_frame(struct irlap_cb *self, struct sk_buff *skb,
 695                                   struct irlap_info *info, int command)
 696 {
 697         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
 698
 699         /* Check if this is a command or a response frame */
 700         if (command)
 701                 irlap_do_event(self, RECV_DISC_CMD, skb, info);
 702         else
 703                 irlap_do_event(self, RECV_RD_RSP, skb, info);
 704 }
 705
 706 /*
 707  * Function irlap_recv_ua_frame (skb, frame)
 708  *
 709  *    Received UA (Unnumbered Acknowledgement) frame
 710  *
 711  */
 712 static inline void irlap_recv_ua_frame(struct irlap_cb *self,
 713                                        struct sk_buff *skb,
 714                                        struct irlap_info *info)
 715 {
 716         irlap_do_event(self, RECV_UA_RSP, skb, info);
 717 }
 718
 719 /*
 720  * Function irlap_send_data_primary(self, skb)
 721  *
 722  *    Send I-frames as the primary station but without the poll bit set
 723  *
 724  */
 725 void irlap_send_data_primary(struct irlap_cb *self, struct sk_buff *skb)
 726 {
 727         struct sk_buff *tx_skb;
 728
 729         if (skb->data[1] == I_FRAME) {
 730
 731                 /*
 732                  *  Insert frame sequence number (Vs) in control field before
 733                  *  inserting into transmit window queue.
 734                  */
 735                 skb->data[1] = I_FRAME | (self->vs << 1);
 736
 737                 /* Copy buffer */
 738                 tx_skb = skb_clone(skb, GFP_ATOMIC);
 739                 if (tx_skb == NULL) {
 740                         return;
 741                 }
 742
 743                 /*
 744                  *  Insert frame in store, in case of retransmissions
 745                  */
 746                 skb_queue_tail(&self->wx_list, skb_get(skb));
 747
 748                 self->vs = (self->vs + 1) % 8;
 749                 self->ack_required = FALSE;
 750                 self->window -= 1;
 751
 752                 irlap_send_i_frame( self, tx_skb, CMD_FRAME);
 753         } else {
 754                 IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__);
 755                 irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
 756                 self->window -= 1;
 757         }
 758 }
 759 /*
 760  * Function irlap_send_data_primary_poll (self, skb)
 761  *
 762  *    Send I(nformation) frame as primary with poll bit set
 763  */
 764 void irlap_send_data_primary_poll(struct irlap_cb *self, struct sk_buff *skb)
 765 {
 766         struct sk_buff *tx_skb;
 767
 768         /* Stop P timer */
 769         del_timer(&self->poll_timer);
 770
 771         /* Is this reliable or unreliable data? */
 772         if (skb->data[1] == I_FRAME) {
 773
 774                 /*
 775                  *  Insert frame sequence number (Vs) in control field before
 776                  *  inserting into transmit window queue.
 777                  */
 778                 skb->data[1] = I_FRAME | (self->vs << 1);
 779
 780                 /* Copy buffer */
 781                 tx_skb = skb_clone(skb, GFP_ATOMIC);
 782                 if (tx_skb == NULL) {
 783                         return;
 784                 }
 785
 786                 /*
 787                  *  Insert frame in store, in case of retransmissions
 788                  */
 789                 skb_queue_tail(&self->wx_list, skb_get(skb));
 790
 791                 /*
 792                  *  Set poll bit if necessary. We do this to the copied
 793                  *  skb, since retransmitted need to set or clear the poll
 794                  *  bit depending on when they are sent.
 795                  */
 796                 tx_skb->data[1] |= PF_BIT;
 797
 798                 self->vs = (self->vs + 1) % 8;
 799                 self->ack_required = FALSE;
 800
 801                 irlap_send_i_frame(self, tx_skb, CMD_FRAME);
 802         } else {
 803                 IRDA_DEBUG(4, "%s(), sending unreliable frame\n", __FUNCTION__);
 804
 805                 if (self->ack_required) {
 806                         irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
 807                         irlap_send_rr_frame(self, CMD_FRAME);
 808                         self->ack_required = FALSE;
 809                 } else {
 810                         skb->data[1] |= PF_BIT;
 811                         irlap_send_ui_frame(self, skb_get(skb), self->caddr, CMD_FRAME);
 812                 }
 813         }
 814
 815         self->window = self->window_size;
 816 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
 817         /* We are allowed to transmit a maximum number of bytes again. */
 818         self->bytes_left = self->line_capacity;
 819 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
 820
 821         irlap_start_final_timer(self, self->final_timeout);
 822 }
 823
 824 /*
 825  * Function irlap_send_data_secondary_final (self, skb)
 826  *
 827  *    Send I(nformation) frame as secondary with final bit set
 828  *
 829  */
 830 void irlap_send_data_secondary_final(struct irlap_cb *self,
 831                                      struct sk_buff *skb)
 832 {
 833         struct sk_buff *tx_skb = NULL;
 834
 835         ASSERT(self != NULL, return;);
 836         ASSERT(self->magic == LAP_MAGIC, return;);
 837         ASSERT(skb != NULL, return;);
 838
 839         /* Is this reliable or unreliable data? */
 840         if (skb->data[1] == I_FRAME) {
 841
 842                 /*
 843                  *  Insert frame sequence number (Vs) in control field before
 844                  *  inserting into transmit window queue.
 845                  */
 846                 skb->data[1] = I_FRAME | (self->vs << 1);
 847
 848                 tx_skb = skb_clone(skb, GFP_ATOMIC);
 849                 if (tx_skb == NULL) {
 850                         return;
 851                 }
 852
 853                 /* Insert frame in store */
 854                 skb_queue_tail(&self->wx_list, skb_get(skb));
 855
 856                 tx_skb->data[1] |= PF_BIT;
 857
 858                 self->vs = (self->vs + 1) % 8;
 859                 self->ack_required = FALSE;
 860
 861                 irlap_send_i_frame(self, tx_skb, RSP_FRAME);
 862         } else {
 863                 if (self->ack_required) {
 864                         irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
 865                         irlap_send_rr_frame(self, RSP_FRAME);
 866                         self->ack_required = FALSE;
 867                 } else {
 868                         skb->data[1] |= PF_BIT;
 869                         irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
 870                 }
 871         }
 872
 873         self->window = self->window_size;
 874 #ifdef CONFIG_IRDA_DYNAMIC_WINDOW
 875         /* We are allowed to transmit a maximum number of bytes again. */
 876         self->bytes_left = self->line_capacity;
 877 #endif /* CONFIG_IRDA_DYNAMIC_WINDOW */
 878
 879         irlap_start_wd_timer(self, self->wd_timeout);
 880 }
 881
 882 /*
 883  * Function irlap_send_data_secondary (self, skb)
 884  *
 885  *    Send I(nformation) frame as secondary without final bit set
 886  *
 887  */
 888 void irlap_send_data_secondary(struct irlap_cb *self, struct sk_buff *skb)
 889 {
 890         struct sk_buff *tx_skb = NULL;
 891
 892         /* Is this reliable or unreliable data? */
 893         if (skb->data[1] == I_FRAME) {
 894
 895                 /*
 896                  *  Insert frame sequence number (Vs) in control field before
 897                  *  inserting into transmit window queue.
 898                  */
 899                 skb->data[1] = I_FRAME | (self->vs << 1);
 900
 901                 tx_skb = skb_clone(skb, GFP_ATOMIC);
 902                 if (tx_skb == NULL) {
 903                         return;
 904                 }
 905
 906                 /* Insert frame in store */
 907                 skb_queue_tail(&self->wx_list, skb_get(skb));
 908
 909                 self->vs = (self->vs + 1) % 8;
 910                 self->ack_required = FALSE;
 911                 self->window -= 1;
 912
 913                 irlap_send_i_frame(self, tx_skb, RSP_FRAME);
 914         } else {
 915                 irlap_send_ui_frame(self, skb_get(skb), self->caddr, RSP_FRAME);
 916                 self->window -= 1;
 917         }
 918 }
 919
 920 /*
 921  * Function irlap_resend_rejected_frames (nr)
 922  *
 923  *    Resend frames which has not been acknowledged. Should be safe to
 924  *    traverse the list without locking it since this function will only be
 925  *    called from interrupt context (BH)
 926  */
 927 void irlap_resend_rejected_frames(struct irlap_cb *self, int command)
 928 {
 929         struct sk_buff *tx_skb;
 930         struct sk_buff *skb;
 931         int count;
 932
 933         ASSERT(self != NULL, return;);
 934         ASSERT(self->magic == LAP_MAGIC, return;);
 935
 936         /* Initialize variables */
 937         skb = tx_skb = NULL;
 938
 939         count = skb_queue_len(&self->wx_list);
 940
 941         /*  Resend unacknowledged frame(s) */
 942         skb = skb_peek(&self->wx_list);
 943         while (skb != NULL) {
 944                 irlap_wait_min_turn_around(self, &self->qos_tx);
 945
 946                 /* We copy the skb to be retransmitted since we will have to
 947                  * modify it. Cloning will confuse packet sniffers
 948                  */
 949                 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
 950                 tx_skb = skb_copy(skb, GFP_ATOMIC);
 951                 if (!tx_skb) {
 952                         IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__);
 953                         return;
 954                 }
 955                 /* Unlink tx_skb from list */
 956                 tx_skb->next = tx_skb->prev = NULL;
 957                 tx_skb->list = NULL;
 958
 959                 /* Clear old Nr field + poll bit */
 960                 tx_skb->data[1] &= 0x0f;
 961
 962                 /*
 963                  *  Set poll bit on the last frame retransmitted
 964                  */
 965                 if (count-- == 1)
 966                         tx_skb->data[1] |= PF_BIT; /* Set p/f bit */
 967                 else
 968                         tx_skb->data[1] &= ~PF_BIT; /* Clear p/f bit */
 969
 970                 irlap_send_i_frame(self, tx_skb, command);
 971
 972                 /*
 973                  *  If our skb is the last buffer in the list, then
 974                  *  we are finished, if not, move to the next sk-buffer
 975                  */
 976                 if (skb == skb_peek_tail(&self->wx_list))
 977                         skb = NULL;
 978                 else
 979                         skb = skb->next;
 980         }
 981 #if 0 /* Not yet */
 982         /*
 983          *  We can now fill the window with additinal data frames
 984          */
 985         while (skb_queue_len( &self->txq) > 0) {
 986
 987                 IRDA_DEBUG(0, "%s(), sending additional frames!\n", __FUNCTION__);
 988                 if ((skb_queue_len( &self->txq) > 0) &&
 989                     (self->window > 0)) {
 990                         skb = skb_dequeue( &self->txq);
 991                         ASSERT(skb != NULL, return;);
 992
 993                         /*
 994                          *  If send window > 1 then send frame with pf
 995                          *  bit cleared
 996                          */
 997                         if ((self->window > 1) &&
 998                             skb_queue_len(&self->txq) > 0)
 999                         {
1000                                 irlap_send_data_primary(self, skb);
1001                         } else {
1002                                 irlap_send_data_primary_poll(self, skb);
1003                         }
1004                         kfree_skb(skb);
1005                 }
1006         }
1007 #endif
1008 }
1009
1010 void irlap_resend_rejected_frame(struct irlap_cb *self, int command)
1011 {
1012         struct sk_buff *tx_skb;
1013         struct sk_buff *skb;
1014
1015         ASSERT(self != NULL, return;);
1016         ASSERT(self->magic == LAP_MAGIC, return;);
1017
1018         /* Initialize variables */
1019         skb = tx_skb = NULL;
1020
1021         /*  Resend unacknowledged frame(s) */
1022         skb = skb_peek(&self->wx_list);
1023         if (skb != NULL) {
1024                 irlap_wait_min_turn_around(self, &self->qos_tx);
1025
1026                 /* We copy the skb to be retransmitted since we will have to
1027                  * modify it. Cloning will confuse packet sniffers
1028                  */
1029                 /* tx_skb = skb_clone( skb, GFP_ATOMIC); */
1030                 tx_skb = skb_copy(skb, GFP_ATOMIC);
1031                 if (!tx_skb) {
1032                         IRDA_DEBUG(0, "%s(), unable to copy\n", __FUNCTION__);
1033                         return;
1034                 }
1035                 /* Unlink tx_skb from list */
1036                 tx_skb->next = tx_skb->prev = NULL;
1037                 tx_skb->list = NULL;
1038
1039                 /* Clear old Nr field + poll bit */
1040                 tx_skb->data[1] &= 0x0f;
1041
1042                 /*  Set poll/final bit */
1043                 tx_skb->data[1] |= PF_BIT; /* Set p/f bit */
1044
1045                 irlap_send_i_frame(self, tx_skb, command);
1046         }
1047 }
1048
1049 /*
1050  * Function irlap_send_ui_frame (self, skb, command)
1051  *
1052  *    Contruct and transmit an Unnumbered Information (UI) frame
1053  *
1054  */
1055 void irlap_send_ui_frame(struct irlap_cb *self, struct sk_buff *skb,
1056                          __u8 caddr, int command)
1057 {
1058         IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
1059
1060         ASSERT(self != NULL, return;);
1061         ASSERT(self->magic == LAP_MAGIC, return;);
1062         ASSERT(skb != NULL, return;);
1063
1064         /* Insert connection address */
1065         skb->data[0] = caddr | ((command) ? CMD_FRAME : 0);
1066
1067         irlap_queue_xmit(self, skb);
1068 }
1069
1070 /*
1071  * Function irlap_send_i_frame (skb)
1072  *
1073  *    Contruct and transmit Information (I) frame
1074  */
1075 void irlap_send_i_frame(struct irlap_cb *self, struct sk_buff *skb,
1076                         int command)
1077 {
1078         /* Insert connection address */
1079         skb->data[0] = self->caddr;
1080         skb->data[0] |= (command) ? CMD_FRAME : 0;
1081
1082         /* Insert next to receive (Vr) */
1083         skb->data[1] |= (self->vr << 5);  /* insert nr */
1084
1085         irlap_queue_xmit(self, skb);
1086 }
1087
1088 /*
1089  * Function irlap_recv_i_frame (skb, frame)
1090  *
1091  *    Receive and parse an I (Information) frame, no harm in making it inline
1092  *    since it's called only from one single place (irlap_driver_rcv).
1093  */
1094 static inline void irlap_recv_i_frame(struct irlap_cb *self,
1095                                       struct sk_buff *skb,
1096                                       struct irlap_info *info, int command)
1097 {
1098         info->nr = skb->data[1] >> 5;          /* Next to receive */
1099         info->pf = skb->data[1] & PF_BIT;      /* Final bit */
1100         info->ns = (skb->data[1] >> 1) & 0x07; /* Next to send */
1101
1102         /* Check if this is a command or a response frame */
1103         if (command)
1104                 irlap_do_event(self, RECV_I_CMD, skb, info);
1105         else
1106                 irlap_do_event(self, RECV_I_RSP, skb, info);
1107 }
1108
1109 /*
1110  * Function irlap_recv_ui_frame (self, skb, info)
1111  *
1112  *    Receive and parse an Unnumbered Information (UI) frame
1113  *
1114  */
1115 static void irlap_recv_ui_frame(struct irlap_cb *self, struct sk_buff *skb,
1116                                 struct irlap_info *info)
1117 {
1118         IRDA_DEBUG( 4, "%s()\n", __FUNCTION__);
1119
1120         info->pf = skb->data[1] & PF_BIT;      /* Final bit */
1121
1122         irlap_do_event(self, RECV_UI_FRAME, skb, info);
1123 }
1124
1125 /*
1126  * Function irlap_recv_frmr_frame (skb, frame)
1127  *
1128  *    Received Frame Reject response.
1129  *
1130  */
1131 static void irlap_recv_frmr_frame(struct irlap_cb *self, struct sk_buff *skb,
1132                                   struct irlap_info *info)
1133 {
1134         __u8 *frame;
1135         int w, x, y, z;
1136
1137         IRDA_DEBUG(0, "%s()\n", __FUNCTION__);
1138
1139         ASSERT(self != NULL, return;);
1140         ASSERT(self->magic == LAP_MAGIC, return;);
1141         ASSERT(skb != NULL, return;);
1142         ASSERT(info != NULL, return;);
1143
1144         frame = skb->data;
1145
1146         info->nr = frame[2] >> 5;          /* Next to receive */
1147         info->pf = frame[2] & PF_BIT;      /* Final bit */
1148         info->ns = (frame[2] >> 1) & 0x07; /* Next to send */
1149
1150         w = frame[3] & 0x01;
1151         x = frame[3] & 0x02;
1152         y = frame[3] & 0x04;
1153         z = frame[3] & 0x08;
1154
1155         if (w) {
1156                 IRDA_DEBUG(0, "Rejected control field is undefined or not "
1157                       "implemented.\n");
1158         }
1159         if (x) {
1160                 IRDA_DEBUG(0, "Rejected control field was invalid because it "
1161                       "contained a non permitted I field.\n");
1162         }
1163         if (y) {
1164                 IRDA_DEBUG(0, "Received I field exceeded the maximum negotiated "
1165                       "for the existing connection or exceeded the maximum "
1166                       "this station supports if no connection exists.\n");
1167         }
1168         if (z) {
1169                 IRDA_DEBUG(0, "Rejected control field control field contained an "
1170                       "invalid Nr count.\n");
1171         }
1172         irlap_do_event(self, RECV_FRMR_RSP, skb, info);
1173 }
1174
1175 /*
1176  * Function irlap_send_test_frame (self, daddr)
1177  *
1178  *    Send a test frame response
1179  *
1180  */
1181 void irlap_send_test_frame(struct irlap_cb *self, __u8 caddr, __u32 daddr,
1182                            struct sk_buff *cmd)
1183 {
1184         struct sk_buff *skb;
1185         struct test_frame *frame;
1186         __u8 *info;
1187
1188         skb = dev_alloc_skb(cmd->len+sizeof(struct test_frame));
1189         if (!skb)
1190                 return;
1191
1192         /* Broadcast frames must include saddr and daddr fields */
1193         if (caddr == CBROADCAST) {
1194                 frame = (struct test_frame *)
1195                         skb_put(skb, sizeof(struct test_frame));
1196
1197                 /* Insert the swapped addresses */
1198                 frame->saddr = cpu_to_le32(self->saddr);
1199                 frame->daddr = cpu_to_le32(daddr);
1200         } else
1201                 frame = (struct test_frame *) skb_put(skb, LAP_ADDR_HEADER + LAP_CTRL_HEADER);
1202
1203         frame->caddr = caddr;
1204         frame->control = TEST_RSP | PF_BIT;
1205
1206         /* Copy info */
1207         info = skb_put(skb, cmd->len);
1208         memcpy(info, cmd->data, cmd->len);
1209
1210         /* Return to sender */
1211         irlap_wait_min_turn_around(self, &self->qos_tx);
1212         irlap_queue_xmit(self, skb);
1213 }
1214
1215 /*
1216  * Function irlap_recv_test_frame (self, skb)
1217  *
1218  *    Receive a test frame
1219  *
1220  */
1221 static void irlap_recv_test_frame(struct irlap_cb *self, struct sk_buff *skb,
1222                                   struct irlap_info *info, int command)
1223 {
1224         struct test_frame *frame;
1225
1226         IRDA_DEBUG(2, "%s()\n", __FUNCTION__);
1227
1228         frame = (struct test_frame *) skb->data;
1229
1230         /* Broadcast frames must carry saddr and daddr fields */
1231         if (info->caddr == CBROADCAST) {
1232                 if (skb->len < sizeof(struct test_frame)) {
1233                         IRDA_DEBUG(0, "%s() test frame to short!\n", __FUNCTION__);
1234                         return;
1235                 }
1236
1237                 /* Read and swap addresses */
1238                 info->daddr = le32_to_cpu(frame->saddr);
1239                 info->saddr = le32_to_cpu(frame->daddr);
1240
1241                 /* Make sure frame is addressed to us */
1242                 if ((info->saddr != self->saddr) &&
1243                     (info->saddr != BROADCAST)) {
1244                         return;
1245                 }
1246         }
1247
1248         if (command)
1249                 irlap_do_event(self, RECV_TEST_CMD, skb, info);
1250         else
1251                 irlap_do_event(self, RECV_TEST_RSP, skb, info);
1252 }
1253
1254 /*
1255  * Function irlap_driver_rcv (skb, netdev, ptype)
1256  *
1257  *    Called when a frame is received. Dispatches the right receive function
1258  *    for processing of the frame.
1259  *
1260  */
1261 int irlap_driver_rcv(struct sk_buff *skb, struct net_device *dev,
1262                      struct packet_type *ptype)
1263 {
1264         struct irlap_info info;
1265         struct irlap_cb *self;
1266         int command;
1267         __u8 control;
1268
1269         /* FIXME: should we get our own field? */
1270         self = (struct irlap_cb *) dev->atalk_ptr;
1271
1272         /* If the net device is down, then IrLAP is gone! */
1273         if (!self || self->magic != LAP_MAGIC) {
1274                 dev_kfree_skb(skb);
1275                 return -1;
1276         }
1277
1278         /* Check if frame is large enough for parsing */
1279         if (skb->len < 2) {
1280                 ERROR("%s(), frame to short!\n", __FUNCTION__);
1281                 dev_kfree_skb(skb);
1282                 return -1;
1283         }
1284
1285         command    = skb->data[0] & CMD_FRAME;
1286         info.caddr = skb->data[0] & CBROADCAST;
1287
1288         info.pf      = skb->data[1] &  PF_BIT;
1289         info.control = skb->data[1] & ~PF_BIT; /* Mask away poll/final bit */
1290
1291         control = info.control;
1292
1293         /*  First we check if this frame has a valid connection address */
1294         if ((info.caddr != self->caddr) && (info.caddr != CBROADCAST)) {
1295                 IRDA_DEBUG(0, "%s(), wrong connection address!\n", __FUNCTION__);
1296                 goto out;
1297         }
1298         /*
1299          *  Optimize for the common case and check if the frame is an
1300          *  I(nformation) frame. Only I-frames have bit 0 set to 0
1301          */
1302         if (~control & 0x01) {
1303                 irlap_recv_i_frame(self, skb, &info, command);
1304                 goto out;
1305         }
1306         /*
1307          *  We now check is the frame is an S(upervisory) frame. Only
1308          *  S-frames have bit 0 set to 1 and bit 1 set to 0
1309          */
1310         if (~control & 0x02) {
1311                 /*
1312                  *  Received S(upervisory) frame, check which frame type it is
1313                  *  only the first nibble is of interest
1314                  */
1315                 switch (control & 0x0f) {
1316                 case RR:
1317                         irlap_recv_rr_frame(self, skb, &info, command);
1318                         break;
1319                 case RNR:
1320                         irlap_recv_rnr_frame(self, skb, &info, command);
1321                         break;
1322                 case REJ:
1323                         irlap_recv_rej_frame(self, skb, &info, command);
1324                         break;
1325                 case SREJ:
1326                         irlap_recv_srej_frame(self, skb, &info, command);
1327                         break;
1328                 default:
1329                         WARNING("%s() Unknown S-frame %02x received!\n", __FUNCTION__,
1330                                 info.control);
1331                         break;
1332                 }
1333                 goto out;
1334         }
1335         /*
1336          *  This must be a C(ontrol) frame
1337          */
1338         switch (control) {
1339         case XID_RSP:
1340                 irlap_recv_discovery_xid_rsp(self, skb, &info);
1341                 break;
1342         case XID_CMD:
1343                 irlap_recv_discovery_xid_cmd(self, skb, &info);
1344                 break;
1345         case SNRM_CMD:
1346                 irlap_recv_snrm_cmd(self, skb, &info);
1347                 break;
1348         case DM_RSP:
1349                 irlap_do_event(self, RECV_DM_RSP, skb, &info);
1350                 break;
1351         case DISC_CMD: /* And RD_RSP since they have the same value */
1352                 irlap_recv_disc_frame(self, skb, &info, command);
1353                 break;
1354         case TEST_CMD:
1355                 irlap_recv_test_frame(self, skb, &info, command);
1356                 break;
1357         case UA_RSP:
1358                 irlap_recv_ua_frame(self, skb, &info);
1359                 break;
1360         case FRMR_RSP:
1361                 irlap_recv_frmr_frame(self, skb, &info);
1362                 break;
1363         case UI_FRAME:
1364                 irlap_recv_ui_frame(self, skb, &info);
1365                 break;
1366         default:
1367                 WARNING("%s(), Unknown frame %02x received!\n", __FUNCTION__,
1368                         info.control);
1369                 break;
1370         }
1371 out:
1372         dev_kfree_skb(skb);
1373         return 0;
1374 }