drivers/net/wan/hdlc_fr.c

   1 /*
   2  * Generic HDLC support routines for Linux
   3  * Frame Relay support
   4  *
   5  * Copyright (C) 1999 - 2005 Krzysztof Halasa <khc@pm.waw.pl>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License
   9  * as published by the Free Software Foundation.
  10  *
  11
  12             Theory of PVC state
  13
  14  DCE mode:
  15
  16  (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
  17          0,x -> 1,1 if "link reliable" when sending FULL STATUS
  18          1,1 -> 1,0 if received FULL STATUS ACK
  19
  20  (active)    -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
  21              -> 1 when "PVC up" and (exist,new) = 1,0
  22
  23  DTE mode:
  24  (exist,new,active) = FULL STATUS if "link reliable"
  25                     = 0, 0, 0 if "link unreliable"
  26  No LMI:
  27  active = open and "link reliable"
  28  exist = new = not used
  29
  30  CCITT LMI: ITU-T Q.933 Annex A
  31  ANSI LMI: ANSI T1.617 Annex D
  32  CISCO LMI: the original, aka "Gang of Four" LMI
  33
  34 */
  35
  36 #include <linux/module.h>
  37 #include <linux/kernel.h>
  38 #include <linux/slab.h>
  39 #include <linux/poll.h>
  40 #include <linux/errno.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/init.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/pkt_sched.h>
  45 #include <linux/random.h>
  46 #include <linux/inetdevice.h>
  47 #include <linux/lapb.h>
  48 #include <linux/rtnetlink.h>
  49 #include <linux/etherdevice.h>
  50 #include <linux/hdlc.h>
  51
  52 #undef DEBUG_PKT
  53 #undef DEBUG_ECN
  54 #undef DEBUG_LINK
  55
  56 #define FR_UI                   0x03
  57 #define FR_PAD                  0x00
  58
  59 #define NLPID_IP                0xCC
  60 #define NLPID_IPV6              0x8E
  61 #define NLPID_SNAP              0x80
  62 #define NLPID_PAD               0x00
  63 #define NLPID_CCITT_ANSI_LMI    0x08
  64 #define NLPID_CISCO_LMI         0x09
  65
  66
  67 #define LMI_CCITT_ANSI_DLCI        0 /* LMI DLCI */
  68 #define LMI_CISCO_DLCI          1023
  69
  70 #define LMI_CALLREF             0x00 /* Call Reference */
  71 #define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI locking shift */
  72 #define LMI_ANSI_CISCO_REPTYPE  0x01 /* report type */
  73 #define LMI_CCITT_REPTYPE       0x51
  74 #define LMI_ANSI_CISCO_ALIVE    0x03 /* keep alive */
  75 #define LMI_CCITT_ALIVE         0x53
  76 #define LMI_ANSI_CISCO_PVCSTAT  0x07 /* PVC status */
  77 #define LMI_CCITT_PVCSTAT       0x57
  78
  79 #define LMI_FULLREP             0x00 /* full report  */
  80 #define LMI_INTEGRITY           0x01 /* link integrity report */
  81 #define LMI_SINGLE              0x02 /* single PVC report */
  82
  83 #define LMI_STATUS_ENQUIRY      0x75
  84 #define LMI_STATUS              0x7D /* reply */
  85
  86 #define LMI_REPT_LEN               1 /* report type element length */
  87 #define LMI_INTEG_LEN              2 /* link integrity element length */
  88
  89 #define LMI_CCITT_CISCO_LENGTH    13 /* LMI frame lengths */
  90 #define LMI_ANSI_LENGTH           14
  91
  92
  93 typedef struct {
  94 #if defined(__LITTLE_ENDIAN_BITFIELD)
  95         unsigned ea1:   1;
  96         unsigned cr:    1;
  97         unsigned dlcih: 6;
  98
  99         unsigned ea2:   1;
 100         unsigned de:    1;
 101         unsigned becn:  1;
 102         unsigned fecn:  1;
 103         unsigned dlcil: 4;
 104 #else
 105         unsigned dlcih: 6;
 106         unsigned cr:    1;
 107         unsigned ea1:   1;
 108
 109         unsigned dlcil: 4;
 110         unsigned fecn:  1;
 111         unsigned becn:  1;
 112         unsigned de:    1;
 113         unsigned ea2:   1;
 114 #endif
 115 }__attribute__ ((packed)) fr_hdr;
 116
 117
 118 static inline u16 q922_to_dlci(u8 *hdr)
 119 {
 120         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 121 }
 122
 123
 124
 125 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 126 {
 127         hdr[0] = (dlci >> 2) & 0xFC;
 128         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 129 }
 130
 131
 132
 133 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
 134 {
 135         pvc_device *pvc = hdlc->state.fr.first_pvc;
 136
 137         while (pvc) {
 138                 if (pvc->dlci == dlci)
 139                         return pvc;
 140                 if (pvc->dlci > dlci)
 141                         return NULL; /* the listed is sorted */
 142                 pvc = pvc->next;
 143         }
 144
 145         return NULL;
 146 }
 147
 148
 149 static inline pvc_device* add_pvc(struct net_device *dev, u16 dlci)
 150 {
 151         hdlc_device *hdlc = dev_to_hdlc(dev);
 152         pvc_device *pvc, **pvc_p = &hdlc->state.fr.first_pvc;
 153
 154         while (*pvc_p) {
 155                 if ((*pvc_p)->dlci == dlci)
 156                         return *pvc_p;
 157                 if ((*pvc_p)->dlci > dlci)
 158                         break;  /* the list is sorted */
 159                 pvc_p = &(*pvc_p)->next;
 160         }
 161
 162         pvc = kmalloc(sizeof(pvc_device), GFP_ATOMIC);
 163         if (!pvc)
 164                 return NULL;
 165
 166         memset(pvc, 0, sizeof(pvc_device));
 167         pvc->dlci = dlci;
 168         pvc->master = dev;
 169         pvc->next = *pvc_p;     /* Put it in the chain */
 170         *pvc_p = pvc;
 171         return pvc;
 172 }
 173
 174
 175 static inline int pvc_is_used(pvc_device *pvc)
 176 {
 177         return pvc->main != NULL || pvc->ether != NULL;
 178 }
 179
 180
 181 static inline void pvc_carrier(int on, pvc_device *pvc)
 182 {
 183         if (on) {
 184                 if (pvc->main)
 185                         if (!netif_carrier_ok(pvc->main))
 186                                 netif_carrier_on(pvc->main);
 187                 if (pvc->ether)
 188                         if (!netif_carrier_ok(pvc->ether))
 189                                 netif_carrier_on(pvc->ether);
 190         } else {
 191                 if (pvc->main)
 192                         if (netif_carrier_ok(pvc->main))
 193                                 netif_carrier_off(pvc->main);
 194                 if (pvc->ether)
 195                         if (netif_carrier_ok(pvc->ether))
 196                                 netif_carrier_off(pvc->ether);
 197         }
 198 }
 199
 200
 201 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 202 {
 203         pvc_device **pvc_p = &hdlc->state.fr.first_pvc;
 204
 205         while (*pvc_p) {
 206                 if (!pvc_is_used(*pvc_p)) {
 207                         pvc_device *pvc = *pvc_p;
 208                         *pvc_p = pvc->next;
 209                         kfree(pvc);
 210                         continue;
 211                 }
 212                 pvc_p = &(*pvc_p)->next;
 213         }
 214 }
 215
 216
 217 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
 218 {
 219         if (type == ARPHRD_ETHER)
 220                 return &pvc->ether;
 221         else
 222                 return &pvc->main;
 223 }
 224
 225
 226 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 227 {
 228         u16 head_len;
 229         struct sk_buff *skb = *skb_p;
 230
 231         switch (skb->protocol) {
 232         case __constant_ntohs(NLPID_CCITT_ANSI_LMI):
 233                 head_len = 4;
 234                 skb_push(skb, head_len);
 235                 skb->data[3] = NLPID_CCITT_ANSI_LMI;
 236                 break;
 237
 238         case __constant_ntohs(NLPID_CISCO_LMI):
 239                 head_len = 4;
 240                 skb_push(skb, head_len);
 241                 skb->data[3] = NLPID_CISCO_LMI;
 242                 break;
 243
 244         case __constant_ntohs(ETH_P_IP):
 245                 head_len = 4;
 246                 skb_push(skb, head_len);
 247                 skb->data[3] = NLPID_IP;
 248                 break;
 249
 250         case __constant_ntohs(ETH_P_IPV6):
 251                 head_len = 4;
 252                 skb_push(skb, head_len);
 253                 skb->data[3] = NLPID_IPV6;
 254                 break;
 255
 256         case __constant_ntohs(ETH_P_802_3):
 257                 head_len = 10;
 258                 if (skb_headroom(skb) < head_len) {
 259                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 260                                                                     head_len);
 261                         if (!skb2)
 262                                 return -ENOBUFS;
 263                         dev_kfree_skb(skb);
 264                         skb = *skb_p = skb2;
 265                 }
 266                 skb_push(skb, head_len);
 267                 skb->data[3] = FR_PAD;
 268                 skb->data[4] = NLPID_SNAP;
 269                 skb->data[5] = FR_PAD;
 270                 skb->data[6] = 0x80;
 271                 skb->data[7] = 0xC2;
 272                 skb->data[8] = 0x00;
 273                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 274                 break;
 275
 276         default:
 277                 head_len = 10;
 278                 skb_push(skb, head_len);
 279                 skb->data[3] = FR_PAD;
 280                 skb->data[4] = NLPID_SNAP;
 281                 skb->data[5] = FR_PAD;
 282                 skb->data[6] = FR_PAD;
 283                 skb->data[7] = FR_PAD;
 284                 *(u16*)(skb->data + 8) = skb->protocol;
 285         }
 286
 287         dlci_to_q922(skb->data, dlci);
 288         skb->data[2] = FR_UI;
 289         return 0;
 290 }
 291
 292
 293
 294 static int pvc_open(struct net_device *dev)
 295 {
 296         pvc_device *pvc = dev_to_pvc(dev);
 297
 298         if ((pvc->master->flags & IFF_UP) == 0)
 299                 return -EIO;  /* Master must be UP in order to activate PVC */
 300
 301         if (pvc->open_count++ == 0) {
 302                 hdlc_device *hdlc = dev_to_hdlc(pvc->master);
 303                 if (hdlc->state.fr.settings.lmi == LMI_NONE)
 304                         pvc->state.active = hdlc->carrier;
 305
 306                 pvc_carrier(pvc->state.active, pvc);
 307                 hdlc->state.fr.dce_changed = 1;
 308         }
 309         return 0;
 310 }
 311
 312
 313
 314 static int pvc_close(struct net_device *dev)
 315 {
 316         pvc_device *pvc = dev_to_pvc(dev);
 317
 318         if (--pvc->open_count == 0) {
 319                 hdlc_device *hdlc = dev_to_hdlc(pvc->master);
 320                 if (hdlc->state.fr.settings.lmi == LMI_NONE)
 321                         pvc->state.active = 0;
 322
 323                 if (hdlc->state.fr.settings.dce) {
 324                         hdlc->state.fr.dce_changed = 1;
 325                         pvc->state.active = 0;
 326                 }
 327         }
 328         return 0;
 329 }
 330
 331
 332
 333 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 334 {
 335         pvc_device *pvc = dev_to_pvc(dev);
 336         fr_proto_pvc_info info;
 337
 338         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 339                 if (dev->type == ARPHRD_ETHER)
 340                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 341                 else
 342                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 343
 344                 if (ifr->ifr_settings.size < sizeof(info)) {
 345                         /* data size wanted */
 346                         ifr->ifr_settings.size = sizeof(info);
 347                         return -ENOBUFS;
 348                 }
 349
 350                 info.dlci = pvc->dlci;
 351                 memcpy(info.master, pvc->master->name, IFNAMSIZ);
 352                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 353                                  &info, sizeof(info)))
 354                         return -EFAULT;
 355                 return 0;
 356         }
 357
 358         return -EINVAL;
 359 }
 360
 361
 362 static inline struct net_device_stats *pvc_get_stats(struct net_device *dev)
 363 {
 364         return netdev_priv(dev);
 365 }
 366
 367
 368
 369 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 370 {
 371         pvc_device *pvc = dev_to_pvc(dev);
 372         struct net_device_stats *stats = pvc_get_stats(dev);
 373
 374         if (pvc->state.active) {
 375                 if (dev->type == ARPHRD_ETHER) {
 376                         int pad = ETH_ZLEN - skb->len;
 377                         if (pad > 0) { /* Pad the frame with zeros */
 378                                 int len = skb->len;
 379                                 if (skb_tailroom(skb) < pad)
 380                                         if (pskb_expand_head(skb, 0, pad,
 381                                                              GFP_ATOMIC)) {
 382                                                 stats->tx_dropped++;
 383                                                 dev_kfree_skb(skb);
 384                                                 return 0;
 385                                         }
 386                                 skb_put(skb, pad);
 387                                 memset(skb->data + len, 0, pad);
 388                         }
 389                         skb->protocol = __constant_htons(ETH_P_802_3);
 390                 }
 391                 if (!fr_hard_header(&skb, pvc->dlci)) {
 392                         stats->tx_bytes += skb->len;
 393                         stats->tx_packets++;
 394                         if (pvc->state.fecn) /* TX Congestion counter */
 395                                 stats->tx_compressed++;
 396                         skb->dev = pvc->master;
 397                         dev_queue_xmit(skb);
 398                         return 0;
 399                 }
 400         }
 401
 402         stats->tx_dropped++;
 403         dev_kfree_skb(skb);
 404         return 0;
 405 }
 406
 407
 408
 409 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
 410 {
 411         if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
 412                 return -EINVAL;
 413         dev->mtu = new_mtu;
 414         return 0;
 415 }
 416
 417
 418
 419 static inline void fr_log_dlci_active(pvc_device *pvc)
 420 {
 421         printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
 422                pvc->master->name,
 423                pvc->dlci,
 424                pvc->main ? pvc->main->name : "",
 425                pvc->main && pvc->ether ? " " : "",
 426                pvc->ether ? pvc->ether->name : "",
 427                pvc->state.new ? " new" : "",
 428                !pvc->state.exist ? "deleted" :
 429                pvc->state.active ? "active" : "inactive");
 430 }
 431
 432
 433
 434 static inline u8 fr_lmi_nextseq(u8 x)
 435 {
 436         x++;
 437         return x ? x : 1;
 438 }
 439
 440
 441
 442 static void fr_lmi_send(struct net_device *dev, int fullrep)
 443 {
 444         hdlc_device *hdlc = dev_to_hdlc(dev);
 445         struct sk_buff *skb;
 446         pvc_device *pvc = hdlc->state.fr.first_pvc;
 447         int lmi = hdlc->state.fr.settings.lmi;
 448         int dce = hdlc->state.fr.settings.dce;
 449         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 450         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 451         u8 *data;
 452         int i = 0;
 453
 454         if (dce && fullrep) {
 455                 len += hdlc->state.fr.dce_pvc_count * (2 + stat_len);
 456                 if (len > HDLC_MAX_MRU) {
 457                         printk(KERN_WARNING "%s: Too many PVCs while sending "
 458                                "LMI full report\n", dev->name);
 459                         return;
 460                 }
 461         }
 462
 463         skb = dev_alloc_skb(len);
 464         if (!skb) {
 465                 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
 466                        dev->name);
 467                 return;
 468         }
 469         memset(skb->data, 0, len);
 470         skb_reserve(skb, 4);
 471         if (lmi == LMI_CISCO) {
 472                 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
 473                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 474         } else {
 475                 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
 476                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 477         }
 478         data = skb->tail;
 479         data[i++] = LMI_CALLREF;
 480         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 481         if (lmi == LMI_ANSI)
 482                 data[i++] = LMI_ANSI_LOCKSHIFT;
 483         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 484                 LMI_ANSI_CISCO_REPTYPE;
 485         data[i++] = LMI_REPT_LEN;
 486         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 487         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 488         data[i++] = LMI_INTEG_LEN;
 489         data[i++] = hdlc->state.fr.txseq =fr_lmi_nextseq(hdlc->state.fr.txseq);
 490         data[i++] = hdlc->state.fr.rxseq;
 491
 492         if (dce && fullrep) {
 493                 while (pvc) {
 494                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 495                                 LMI_ANSI_CISCO_PVCSTAT;
 496                         data[i++] = stat_len;
 497
 498                         /* LMI start/restart */
 499                         if (hdlc->state.fr.reliable && !pvc->state.exist) {
 500                                 pvc->state.exist = pvc->state.new = 1;
 501                                 fr_log_dlci_active(pvc);
 502                         }
 503
 504                         /* ifconfig PVC up */
 505                         if (pvc->open_count && !pvc->state.active &&
 506                             pvc->state.exist && !pvc->state.new) {
 507                                 pvc_carrier(1, pvc);
 508                                 pvc->state.active = 1;
 509                                 fr_log_dlci_active(pvc);
 510                         }
 511
 512                         if (lmi == LMI_CISCO) {
 513                                 data[i] = pvc->dlci >> 8;
 514                                 data[i + 1] = pvc->dlci & 0xFF;
 515                         } else {
 516                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 517                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 518                                 data[i + 2] = 0x80;
 519                         }
 520
 521                         if (pvc->state.new)
 522                                 data[i + 2] |= 0x08;
 523                         else if (pvc->state.active)
 524                                 data[i + 2] |= 0x02;
 525
 526                         i += stat_len;
 527                         pvc = pvc->next;
 528                 }
 529         }
 530
 531         skb_put(skb, i);
 532         skb->priority = TC_PRIO_CONTROL;
 533         skb->dev = dev;
 534         skb->nh.raw = skb->data;
 535
 536         dev_queue_xmit(skb);
 537 }
 538
 539
 540
 541 static void fr_set_link_state(int reliable, struct net_device *dev)
 542 {
 543         hdlc_device *hdlc = dev_to_hdlc(dev);
 544         pvc_device *pvc = hdlc->state.fr.first_pvc;
 545
 546         hdlc->state.fr.reliable = reliable;
 547         if (reliable) {
 548 #if 0
 549                 if (!netif_carrier_ok(dev))
 550                         netif_carrier_on(dev);
 551 #endif
 552
 553                 hdlc->state.fr.n391cnt = 0; /* Request full status */
 554                 hdlc->state.fr.dce_changed = 1;
 555
 556                 if (hdlc->state.fr.settings.lmi == LMI_NONE) {
 557                         while (pvc) {   /* Activate all PVCs */
 558                                 pvc_carrier(1, pvc);
 559                                 pvc->state.exist = pvc->state.active = 1;
 560                                 pvc->state.new = 0;
 561                                 pvc = pvc->next;
 562                         }
 563                 }
 564         } else {
 565 #if 0
 566                 if (netif_carrier_ok(dev))
 567                         netif_carrier_off(dev);
 568 #endif
 569
 570                 while (pvc) {           /* Deactivate all PVCs */
 571                         pvc_carrier(0, pvc);
 572                         pvc->state.exist = pvc->state.active = 0;
 573                         pvc->state.new = 0;
 574                         if (!hdlc->state.fr.settings.dce)
 575                                 pvc->state.bandwidth = 0;
 576                         pvc = pvc->next;
 577                 }
 578         }
 579 }
 580
 581
 582
 583 static void fr_timer(unsigned long arg)
 584 {
 585         struct net_device *dev = (struct net_device *)arg;
 586         hdlc_device *hdlc = dev_to_hdlc(dev);
 587         int i, cnt = 0, reliable;
 588         u32 list;
 589
 590         if (hdlc->state.fr.settings.dce) {
 591                 reliable = hdlc->state.fr.request &&
 592                         time_before(jiffies, hdlc->state.fr.last_poll +
 593                                     hdlc->state.fr.settings.t392 * HZ);
 594                 hdlc->state.fr.request = 0;
 595         } else {
 596                 hdlc->state.fr.last_errors <<= 1; /* Shift the list */
 597                 if (hdlc->state.fr.request) {
 598                         if (hdlc->state.fr.reliable)
 599                                 printk(KERN_INFO "%s: No LMI status reply "
 600                                        "received\n", dev->name);
 601                         hdlc->state.fr.last_errors |= 1;
 602                 }
 603
 604                 list = hdlc->state.fr.last_errors;
 605                 for (i = 0; i < hdlc->state.fr.settings.n393; i++, list >>= 1)
 606                         cnt += (list & 1);      /* errors count */
 607
 608                 reliable = (cnt < hdlc->state.fr.settings.n392);
 609         }
 610
 611         if (hdlc->state.fr.reliable != reliable) {
 612                 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
 613                        reliable ? "" : "un");
 614                 fr_set_link_state(reliable, dev);
 615         }
 616
 617         if (hdlc->state.fr.settings.dce)
 618                 hdlc->state.fr.timer.expires = jiffies +
 619                         hdlc->state.fr.settings.t392 * HZ;
 620         else {
 621                 if (hdlc->state.fr.n391cnt)
 622                         hdlc->state.fr.n391cnt--;
 623
 624                 fr_lmi_send(dev, hdlc->state.fr.n391cnt == 0);
 625
 626                 hdlc->state.fr.last_poll = jiffies;
 627                 hdlc->state.fr.request = 1;
 628                 hdlc->state.fr.timer.expires = jiffies +
 629                         hdlc->state.fr.settings.t391 * HZ;
 630         }
 631
 632         hdlc->state.fr.timer.function = fr_timer;
 633         hdlc->state.fr.timer.data = arg;
 634         add_timer(&hdlc->state.fr.timer);
 635 }
 636
 637
 638
 639 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 640 {
 641         hdlc_device *hdlc = dev_to_hdlc(dev);
 642         pvc_device *pvc;
 643         u8 rxseq, txseq;
 644         int lmi = hdlc->state.fr.settings.lmi;
 645         int dce = hdlc->state.fr.settings.dce;
 646         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 647
 648         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 649                         LMI_CCITT_CISCO_LENGTH)) {
 650                 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
 651                 return 1;
 652         }
 653
 654         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 655                              NLPID_CCITT_ANSI_LMI)) {
 656                 printk(KERN_INFO "%s: Received non-LMI frame with LMI"
 657                        " DLCI\n", dev->name);
 658                 return 1;
 659         }
 660
 661         if (skb->data[4] != LMI_CALLREF) {
 662                 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
 663                        dev->name, skb->data[4]);
 664                 return 1;
 665         }
 666
 667         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 668                 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
 669                        dev->name, skb->data[5]);
 670                 return 1;
 671         }
 672
 673         if (lmi == LMI_ANSI) {
 674                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 675                         printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
 676                                " message (0x%02X)\n", dev->name, skb->data[6]);
 677                         return 1;
 678                 }
 679                 i = 7;
 680         } else
 681                 i = 6;
 682
 683         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 684                              LMI_ANSI_CISCO_REPTYPE)) {
 685                 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
 686                        dev->name, skb->data[i]);
 687                 return 1;
 688         }
 689
 690         if (skb->data[++i] != LMI_REPT_LEN) {
 691                 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
 692                        " (%u)\n", dev->name, skb->data[i]);
 693                 return 1;
 694         }
 695
 696         reptype = skb->data[++i];
 697         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 698                 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
 699                        dev->name, reptype);
 700                 return 1;
 701         }
 702
 703         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 704                                LMI_ANSI_CISCO_ALIVE)) {
 705                 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
 706                        " IE (0x%02X)\n", dev->name, skb->data[i]);
 707                 return 1;
 708         }
 709
 710         if (skb->data[++i] != LMI_INTEG_LEN) {
 711                 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
 712                        " IE length (%u)\n", dev->name, skb->data[i]);
 713                 return 1;
 714         }
 715         i++;
 716
 717         hdlc->state.fr.rxseq = skb->data[i++]; /* TX sequence from peer */
 718         rxseq = skb->data[i++]; /* Should confirm our sequence */
 719
 720         txseq = hdlc->state.fr.txseq;
 721
 722         if (dce)
 723                 hdlc->state.fr.last_poll = jiffies;
 724
 725         error = 0;
 726         if (!hdlc->state.fr.reliable)
 727                 error = 1;
 728
 729         if (rxseq == 0 || rxseq != txseq) {
 730                 hdlc->state.fr.n391cnt = 0; /* Ask for full report next time */
 731                 error = 1;
 732         }
 733
 734         if (dce) {
 735                 if (hdlc->state.fr.fullrep_sent && !error) {
 736 /* Stop sending full report - the last one has been confirmed by DTE */
 737                         hdlc->state.fr.fullrep_sent = 0;
 738                         pvc = hdlc->state.fr.first_pvc;
 739                         while (pvc) {
 740                                 if (pvc->state.new) {
 741                                         pvc->state.new = 0;
 742
 743 /* Tell DTE that new PVC is now active */
 744                                         hdlc->state.fr.dce_changed = 1;
 745                                 }
 746                                 pvc = pvc->next;
 747                         }
 748                 }
 749
 750                 if (hdlc->state.fr.dce_changed) {
 751                         reptype = LMI_FULLREP;
 752                         hdlc->state.fr.fullrep_sent = 1;
 753                         hdlc->state.fr.dce_changed = 0;
 754                 }
 755
 756                 hdlc->state.fr.request = 1; /* got request */
 757                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 758                 return 0;
 759         }
 760
 761         /* DTE */
 762
 763         hdlc->state.fr.request = 0; /* got response, no request pending */
 764
 765         if (error)
 766                 return 0;
 767
 768         if (reptype != LMI_FULLREP)
 769                 return 0;
 770
 771         pvc = hdlc->state.fr.first_pvc;
 772
 773         while (pvc) {
 774                 pvc->state.deleted = 1;
 775                 pvc = pvc->next;
 776         }
 777
 778         no_ram = 0;
 779         while (skb->len >= i + 2 + stat_len) {
 780                 u16 dlci;
 781                 u32 bw;
 782                 unsigned int active, new;
 783
 784                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 785                                        LMI_ANSI_CISCO_PVCSTAT)) {
 786                         printk(KERN_INFO "%s: Not an LMI PVC status IE"
 787                                " (0x%02X)\n", dev->name, skb->data[i]);
 788                         return 1;
 789                 }
 790
 791                 if (skb->data[++i] != stat_len) {
 792                         printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
 793                                " (%u)\n", dev->name, skb->data[i]);
 794                         return 1;
 795                 }
 796                 i++;
 797
 798                 new = !! (skb->data[i + 2] & 0x08);
 799                 active = !! (skb->data[i + 2] & 0x02);
 800                 if (lmi == LMI_CISCO) {
 801                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 802                         bw = (skb->data[i + 3] << 16) |
 803                                 (skb->data[i + 4] << 8) |
 804                                 (skb->data[i + 5]);
 805                 } else {
 806                         dlci = ((skb->data[i] & 0x3F) << 4) |
 807                                 ((skb->data[i + 1] & 0x78) >> 3);
 808                         bw = 0;
 809                 }
 810
 811                 pvc = add_pvc(dev, dlci);
 812
 813                 if (!pvc && !no_ram) {
 814                         printk(KERN_WARNING
 815                                "%s: Memory squeeze on fr_lmi_recv()\n",
 816                                dev->name);
 817                         no_ram = 1;
 818                 }
 819
 820                 if (pvc) {
 821                         pvc->state.exist = 1;
 822                         pvc->state.deleted = 0;
 823                         if (active != pvc->state.active ||
 824                             new != pvc->state.new ||
 825                             bw != pvc->state.bandwidth ||
 826                             !pvc->state.exist) {
 827                                 pvc->state.new = new;
 828                                 pvc->state.active = active;
 829                                 pvc->state.bandwidth = bw;
 830                                 pvc_carrier(active, pvc);
 831                                 fr_log_dlci_active(pvc);
 832                         }
 833                 }
 834
 835                 i += stat_len;
 836         }
 837
 838         pvc = hdlc->state.fr.first_pvc;
 839
 840         while (pvc) {
 841                 if (pvc->state.deleted && pvc->state.exist) {
 842                         pvc_carrier(0, pvc);
 843                         pvc->state.active = pvc->state.new = 0;
 844                         pvc->state.exist = 0;
 845                         pvc->state.bandwidth = 0;
 846                         fr_log_dlci_active(pvc);
 847                 }
 848                 pvc = pvc->next;
 849         }
 850
 851         /* Next full report after N391 polls */
 852         hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391;
 853
 854         return 0;
 855 }
 856
 857
 858
 859 static int fr_rx(struct sk_buff *skb)
 860 {
 861         struct net_device *ndev = skb->dev;
 862         hdlc_device *hdlc = dev_to_hdlc(ndev);
 863         fr_hdr *fh = (fr_hdr*)skb->data;
 864         u8 *data = skb->data;
 865         u16 dlci;
 866         pvc_device *pvc;
 867         struct net_device *dev = NULL;
 868
 869         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 870                 goto rx_error;
 871
 872         dlci = q922_to_dlci(skb->data);
 873
 874         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 875              (hdlc->state.fr.settings.lmi == LMI_ANSI ||
 876               hdlc->state.fr.settings.lmi == LMI_CCITT)) ||
 877             (dlci == LMI_CISCO_DLCI &&
 878              hdlc->state.fr.settings.lmi == LMI_CISCO)) {
 879                 if (fr_lmi_recv(ndev, skb))
 880                         goto rx_error;
 881                 dev_kfree_skb_any(skb);
 882                 return NET_RX_SUCCESS;
 883         }
 884
 885         pvc = find_pvc(hdlc, dlci);
 886         if (!pvc) {
 887 #ifdef DEBUG_PKT
 888                 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
 889                        ndev->name, dlci);
 890 #endif
 891                 dev_kfree_skb_any(skb);
 892                 return NET_RX_DROP;
 893         }
 894
 895         if (pvc->state.fecn != fh->fecn) {
 896 #ifdef DEBUG_ECN
 897                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", ndev->name,
 898                        dlci, fh->fecn ? "N" : "FF");
 899 #endif
 900                 pvc->state.fecn ^= 1;
 901         }
 902
 903         if (pvc->state.becn != fh->becn) {
 904 #ifdef DEBUG_ECN
 905                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", ndev->name,
 906                        dlci, fh->becn ? "N" : "FF");
 907 #endif
 908                 pvc->state.becn ^= 1;
 909         }
 910
 911
 912         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 913                 hdlc->stats.rx_dropped++;
 914                 return NET_RX_DROP;
 915         }
 916
 917         if (data[3] == NLPID_IP) {
 918                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 919                 dev = pvc->main;
 920                 skb->protocol = htons(ETH_P_IP);
 921
 922         } else if (data[3] == NLPID_IPV6) {
 923                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 924                 dev = pvc->main;
 925                 skb->protocol = htons(ETH_P_IPV6);
 926
 927         } else if (skb->len > 10 && data[3] == FR_PAD &&
 928                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 929                 u16 oui = ntohs(*(u16*)(data + 6));
 930                 u16 pid = ntohs(*(u16*)(data + 8));
 931                 skb_pull(skb, 10);
 932
 933                 switch ((((u32)oui) << 16) | pid) {
 934                 case ETH_P_ARP: /* routed frame with SNAP */
 935                 case ETH_P_IPX:
 936                 case ETH_P_IP:  /* a long variant */
 937                 case ETH_P_IPV6:
 938                         dev = pvc->main;
 939                         skb->protocol = htons(pid);
 940                         break;
 941
 942                 case 0x80C20007: /* bridged Ethernet frame */
 943                         if ((dev = pvc->ether) != NULL)
 944                                 skb->protocol = eth_type_trans(skb, dev);
 945                         break;
 946
 947                 default:
 948                         printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
 949                                "PID=%x\n", ndev->name, oui, pid);
 950                         dev_kfree_skb_any(skb);
 951                         return NET_RX_DROP;
 952                 }
 953         } else {
 954                 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
 955                        "length = %i\n", ndev->name, data[3], skb->len);
 956                 dev_kfree_skb_any(skb);
 957                 return NET_RX_DROP;
 958         }
 959
 960         if (dev) {
 961                 struct net_device_stats *stats = pvc_get_stats(dev);
 962                 stats->rx_packets++; /* PVC traffic */
 963                 stats->rx_bytes += skb->len;
 964                 if (pvc->state.becn)
 965                         stats->rx_compressed++;
 966                 skb->dev = dev;
 967                 netif_rx(skb);
 968                 return NET_RX_SUCCESS;
 969         } else {
 970                 dev_kfree_skb_any(skb);
 971                 return NET_RX_DROP;
 972         }
 973
 974  rx_error:
 975         hdlc->stats.rx_errors++; /* Mark error */
 976         dev_kfree_skb_any(skb);
 977         return NET_RX_DROP;
 978 }
 979
 980
 981
 982 static void fr_start(struct net_device *dev)
 983 {
 984         hdlc_device *hdlc = dev_to_hdlc(dev);
 985 #ifdef DEBUG_LINK
 986         printk(KERN_DEBUG "fr_start\n");
 987 #endif
 988         if (hdlc->state.fr.settings.lmi != LMI_NONE) {
 989                 hdlc->state.fr.reliable = 0;
 990                 hdlc->state.fr.dce_changed = 1;
 991                 hdlc->state.fr.request = 0;
 992                 hdlc->state.fr.fullrep_sent = 0;
 993                 hdlc->state.fr.last_errors = 0xFFFFFFFF;
 994                 hdlc->state.fr.n391cnt = 0;
 995                 hdlc->state.fr.txseq = hdlc->state.fr.rxseq = 0;
 996
 997                 init_timer(&hdlc->state.fr.timer);
 998                 /* First poll after 1 s */
 999                 hdlc->state.fr.timer.expires = jiffies + HZ;
1000                 hdlc->state.fr.timer.function = fr_timer;
1001                 hdlc->state.fr.timer.data = (unsigned long)dev;
1002                 add_timer(&hdlc->state.fr.timer);
1003         } else
1004                 fr_set_link_state(1, dev);
1005 }
1006
1007
1008
1009 static void fr_stop(struct net_device *dev)
1010 {
1011         hdlc_device *hdlc = dev_to_hdlc(dev);
1012 #ifdef DEBUG_LINK
1013         printk(KERN_DEBUG "fr_stop\n");
1014 #endif
1015         if (hdlc->state.fr.settings.lmi != LMI_NONE)
1016                 del_timer_sync(&hdlc->state.fr.timer);
1017         fr_set_link_state(0, dev);
1018 }
1019
1020
1021
1022 static void fr_close(struct net_device *dev)
1023 {
1024         hdlc_device *hdlc = dev_to_hdlc(dev);
1025         pvc_device *pvc = hdlc->state.fr.first_pvc;
1026
1027         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1028                 if (pvc->main)
1029                         dev_close(pvc->main);
1030                 if (pvc->ether)
1031                         dev_close(pvc->ether);
1032                 pvc = pvc->next;
1033         }
1034 }
1035
1036 static void dlci_setup(struct net_device *dev)
1037 {
1038         dev->type = ARPHRD_DLCI;
1039         dev->flags = IFF_POINTOPOINT;
1040         dev->hard_header_len = 10;
1041         dev->addr_len = 2;
1042 }
1043
1044 static int fr_add_pvc(struct net_device *master, unsigned int dlci, int type)
1045 {
1046         hdlc_device *hdlc = dev_to_hdlc(master);
1047         pvc_device *pvc = NULL;
1048         struct net_device *dev;
1049         int result, used;
1050         char * prefix = "pvc%d";
1051
1052         if (type == ARPHRD_ETHER)
1053                 prefix = "pvceth%d";
1054
1055         if ((pvc = add_pvc(master, dlci)) == NULL) {
1056                 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1057                        master->name);
1058                 return -ENOBUFS;
1059         }
1060
1061         if (*get_dev_p(pvc, type))
1062                 return -EEXIST;
1063
1064         used = pvc_is_used(pvc);
1065
1066         if (type == ARPHRD_ETHER)
1067                 dev = alloc_netdev(sizeof(struct net_device_stats),
1068                                    "pvceth%d", ether_setup);
1069         else
1070                 dev = alloc_netdev(sizeof(struct net_device_stats),
1071                                    "pvc%d", dlci_setup);
1072
1073         if (!dev) {
1074                 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1075                        master->name);
1076                 delete_unused_pvcs(hdlc);
1077                 return -ENOBUFS;
1078         }
1079
1080         if (type == ARPHRD_ETHER) {
1081                 memcpy(dev->dev_addr, "\x00\x01", 2);
1082                 get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
1083         } else {
1084                 *(u16*)dev->dev_addr = htons(dlci);
1085                 dlci_to_q922(dev->broadcast, dlci);
1086         }
1087         dev->hard_start_xmit = pvc_xmit;
1088         dev->get_stats = pvc_get_stats;
1089         dev->open = pvc_open;
1090         dev->stop = pvc_close;
1091         dev->do_ioctl = pvc_ioctl;
1092         dev->change_mtu = pvc_change_mtu;
1093         dev->mtu = HDLC_MAX_MTU;
1094         dev->tx_queue_len = 0;
1095         dev->priv = pvc;
1096
1097         result = dev_alloc_name(dev, dev->name);
1098         if (result < 0) {
1099                 free_netdev(dev);
1100                 delete_unused_pvcs(hdlc);
1101                 return result;
1102         }
1103
1104         if (register_netdevice(dev) != 0) {
1105                 free_netdev(dev);
1106                 delete_unused_pvcs(hdlc);
1107                 return -EIO;
1108         }
1109
1110         dev->destructor = free_netdev;
1111         *get_dev_p(pvc, type) = dev;
1112         if (!used) {
1113                 hdlc->state.fr.dce_changed = 1;
1114                 hdlc->state.fr.dce_pvc_count++;
1115         }
1116         return 0;
1117 }
1118
1119
1120
1121 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1122 {
1123         pvc_device *pvc;
1124         struct net_device *dev;
1125
1126         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1127                 return -ENOENT;
1128
1129         if ((dev = *get_dev_p(pvc, type)) == NULL)
1130                 return -ENOENT;
1131
1132         if (dev->flags & IFF_UP)
1133                 return -EBUSY;          /* PVC in use */
1134
1135         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1136         *get_dev_p(pvc, type) = NULL;
1137
1138         if (!pvc_is_used(pvc)) {
1139                 hdlc->state.fr.dce_pvc_count--;
1140                 hdlc->state.fr.dce_changed = 1;
1141         }
1142         delete_unused_pvcs(hdlc);
1143         return 0;
1144 }
1145
1146
1147
1148 static void fr_destroy(hdlc_device *hdlc)
1149 {
1150         pvc_device *pvc;
1151
1152         pvc = hdlc->state.fr.first_pvc;
1153         hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */
1154         hdlc->state.fr.dce_pvc_count = 0;
1155         hdlc->state.fr.dce_changed = 1;
1156
1157         while (pvc) {
1158                 pvc_device *next = pvc->next;
1159                 /* destructors will free_netdev() main and ether */
1160                 if (pvc->main)
1161                         unregister_netdevice(pvc->main);
1162
1163                 if (pvc->ether)
1164                         unregister_netdevice(pvc->ether);
1165
1166                 kfree(pvc);
1167                 pvc = next;
1168         }
1169 }
1170
1171
1172
1173 int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1174 {
1175         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1176         const size_t size = sizeof(fr_proto);
1177         fr_proto new_settings;
1178         hdlc_device *hdlc = dev_to_hdlc(dev);
1179         fr_proto_pvc pvc;
1180         int result;
1181
1182         switch (ifr->ifr_settings.type) {
1183         case IF_GET_PROTO:
1184                 ifr->ifr_settings.type = IF_PROTO_FR;
1185                 if (ifr->ifr_settings.size < size) {
1186                         ifr->ifr_settings.size = size; /* data size wanted */
1187                         return -ENOBUFS;
1188                 }
1189                 if (copy_to_user(fr_s, &hdlc->state.fr.settings, size))
1190                         return -EFAULT;
1191                 return 0;
1192
1193         case IF_PROTO_FR:
1194                 if(!capable(CAP_NET_ADMIN))
1195                         return -EPERM;
1196
1197                 if(dev->flags & IFF_UP)
1198                         return -EBUSY;
1199
1200                 if (copy_from_user(&new_settings, fr_s, size))
1201                         return -EFAULT;
1202
1203                 if (new_settings.lmi == LMI_DEFAULT)
1204                         new_settings.lmi = LMI_ANSI;
1205
1206                 if ((new_settings.lmi != LMI_NONE &&
1207                      new_settings.lmi != LMI_ANSI &&
1208                      new_settings.lmi != LMI_CCITT &&
1209                      new_settings.lmi != LMI_CISCO) ||
1210                     new_settings.t391 < 1 ||
1211                     new_settings.t392 < 2 ||
1212                     new_settings.n391 < 1 ||
1213                     new_settings.n392 < 1 ||
1214                     new_settings.n393 < new_settings.n392 ||
1215                     new_settings.n393 > 32 ||
1216                     (new_settings.dce != 0 &&
1217                      new_settings.dce != 1))
1218                         return -EINVAL;
1219
1220                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1221                 if (result)
1222                         return result;
1223
1224                 if (hdlc->proto.id != IF_PROTO_FR) {
1225                         hdlc_proto_detach(hdlc);
1226                         hdlc->state.fr.first_pvc = NULL;
1227                         hdlc->state.fr.dce_pvc_count = 0;
1228                 }
1229                 memcpy(&hdlc->state.fr.settings, &new_settings, size);
1230                 memset(&hdlc->proto, 0, sizeof(hdlc->proto));
1231
1232                 hdlc->proto.close = fr_close;
1233                 hdlc->proto.start = fr_start;
1234                 hdlc->proto.stop = fr_stop;
1235                 hdlc->proto.detach = fr_destroy;
1236                 hdlc->proto.netif_rx = fr_rx;
1237                 hdlc->proto.id = IF_PROTO_FR;
1238                 dev->hard_start_xmit = hdlc->xmit;
1239                 dev->hard_header = NULL;
1240                 dev->type = ARPHRD_FRAD;
1241                 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1242                 dev->addr_len = 0;
1243                 return 0;
1244
1245         case IF_PROTO_FR_ADD_PVC:
1246         case IF_PROTO_FR_DEL_PVC:
1247         case IF_PROTO_FR_ADD_ETH_PVC:
1248         case IF_PROTO_FR_DEL_ETH_PVC:
1249                 if(!capable(CAP_NET_ADMIN))
1250                         return -EPERM;
1251
1252                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1253                                    sizeof(fr_proto_pvc)))
1254                         return -EFAULT;
1255
1256                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1257                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1258
1259                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1260                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1261                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1262                 else
1263                         result = ARPHRD_DLCI;
1264
1265                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1266                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1267                         return fr_add_pvc(dev, pvc.dlci, result);
1268                 else
1269                         return fr_del_pvc(hdlc, pvc.dlci, result);
1270         }
1271
1272         return -EINVAL;
1273 }