drivers/net/wan/hdlc_fr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic HDLC support routines for Linux
   4  * Frame Relay support
   5  *
   6  * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
   7  *
   8
   9         Theory of PVC state
  10
  11  DCE mode:
  12
  13  (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
  14          0,x -> 1,1 if "link reliable" when sending FULL STATUS
  15          1,1 -> 1,0 if received FULL STATUS ACK
  16
  17  (active)    -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
  18              -> 1 when "PVC up" and (exist,new) = 1,0
  19
  20  DTE mode:
  21  (exist,new,active) = FULL STATUS if "link reliable"
  22                     = 0, 0, 0 if "link unreliable"
  23  No LMI:
  24  active = open and "link reliable"
  25  exist = new = not used
  26
  27  CCITT LMI: ITU-T Q.933 Annex A
  28  ANSI LMI: ANSI T1.617 Annex D
  29  CISCO LMI: the original, aka "Gang of Four" LMI
  30
  31 */
  32
  33 #include <linux/errno.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/hdlc.h>
  36 #include <linux/if_arp.h>
  37 #include <linux/inetdevice.h>
  38 #include <linux/init.h>
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/pkt_sched.h>
  42 #include <linux/poll.h>
  43 #include <linux/rtnetlink.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/slab.h>
  46
  47 #undef DEBUG_PKT
  48 #undef DEBUG_ECN
  49 #undef DEBUG_LINK
  50 #undef DEBUG_PROTO
  51 #undef DEBUG_PVC
  52
  53 #define FR_UI                   0x03
  54 #define FR_PAD                  0x00
  55
  56 #define NLPID_IP                0xCC
  57 #define NLPID_IPV6              0x8E
  58 #define NLPID_SNAP              0x80
  59 #define NLPID_PAD               0x00
  60 #define NLPID_CCITT_ANSI_LMI    0x08
  61 #define NLPID_CISCO_LMI         0x09
  62
  63 #define LMI_CCITT_ANSI_DLCI        0 /* LMI DLCI */
  64 #define LMI_CISCO_DLCI          1023
  65
  66 #define LMI_CALLREF             0x00 /* Call Reference */
  67 #define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI locking shift */
  68 #define LMI_ANSI_CISCO_REPTYPE  0x01 /* report type */
  69 #define LMI_CCITT_REPTYPE       0x51
  70 #define LMI_ANSI_CISCO_ALIVE    0x03 /* keep alive */
  71 #define LMI_CCITT_ALIVE         0x53
  72 #define LMI_ANSI_CISCO_PVCSTAT  0x07 /* PVC status */
  73 #define LMI_CCITT_PVCSTAT       0x57
  74
  75 #define LMI_FULLREP             0x00 /* full report  */
  76 #define LMI_INTEGRITY           0x01 /* link integrity report */
  77 #define LMI_SINGLE              0x02 /* single PVC report */
  78
  79 #define LMI_STATUS_ENQUIRY      0x75
  80 #define LMI_STATUS              0x7D /* reply */
  81
  82 #define LMI_REPT_LEN               1 /* report type element length */
  83 #define LMI_INTEG_LEN              2 /* link integrity element length */
  84
  85 #define LMI_CCITT_CISCO_LENGTH    13 /* LMI frame lengths */
  86 #define LMI_ANSI_LENGTH           14
  87
  88 struct fr_hdr {
  89 #if defined(__LITTLE_ENDIAN_BITFIELD)
  90         unsigned ea1:   1;
  91         unsigned cr:    1;
  92         unsigned dlcih: 6;
  93
  94         unsigned ea2:   1;
  95         unsigned de:    1;
  96         unsigned becn:  1;
  97         unsigned fecn:  1;
  98         unsigned dlcil: 4;
  99 #else
 100         unsigned dlcih: 6;
 101         unsigned cr:    1;
 102         unsigned ea1:   1;
 103
 104         unsigned dlcil: 4;
 105         unsigned fecn:  1;
 106         unsigned becn:  1;
 107         unsigned de:    1;
 108         unsigned ea2:   1;
 109 #endif
 110 } __packed;
 111
 112 struct pvc_device {
 113         struct net_device *frad;
 114         struct net_device *main;
 115         struct net_device *ether;       /* bridged Ethernet interface   */
 116         struct pvc_device *next;        /* Sorted in ascending DLCI order */
 117         int dlci;
 118         int open_count;
 119
 120         struct {
 121                 unsigned int new: 1;
 122                 unsigned int active: 1;
 123                 unsigned int exist: 1;
 124                 unsigned int deleted: 1;
 125                 unsigned int fecn: 1;
 126                 unsigned int becn: 1;
 127                 unsigned int bandwidth; /* Cisco LMI reporting only */
 128         } state;
 129 };
 130
 131 struct frad_state {
 132         fr_proto settings;
 133         struct pvc_device *first_pvc;
 134         int dce_pvc_count;
 135
 136         struct timer_list timer;
 137         struct net_device *dev;
 138         unsigned long last_poll;
 139         int reliable;
 140         int dce_changed;
 141         int request;
 142         int fullrep_sent;
 143         u32 last_errors; /* last errors bit list */
 144         u8 n391cnt;
 145         u8 txseq; /* TX sequence number */
 146         u8 rxseq; /* RX sequence number */
 147 };
 148
 149 static int fr_ioctl(struct net_device *dev, struct if_settings *ifs);
 150
 151 static inline u16 q922_to_dlci(u8 *hdr)
 152 {
 153         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 154 }
 155
 156 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 157 {
 158         hdr[0] = (dlci >> 2) & 0xFC;
 159         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 160 }
 161
 162 static inline struct frad_state *state(hdlc_device *hdlc)
 163 {
 164         return (struct frad_state *)(hdlc->state);
 165 }
 166
 167 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
 168 {
 169         struct pvc_device *pvc = state(hdlc)->first_pvc;
 170
 171         while (pvc) {
 172                 if (pvc->dlci == dlci)
 173                         return pvc;
 174                 if (pvc->dlci > dlci)
 175                         return NULL; /* the list is sorted */
 176                 pvc = pvc->next;
 177         }
 178
 179         return NULL;
 180 }
 181
 182 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
 183 {
 184         hdlc_device *hdlc = dev_to_hdlc(dev);
 185         struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 186
 187         while (*pvc_p) {
 188                 if ((*pvc_p)->dlci == dlci)
 189                         return *pvc_p;
 190                 if ((*pvc_p)->dlci > dlci)
 191                         break;  /* the list is sorted */
 192                 pvc_p = &(*pvc_p)->next;
 193         }
 194
 195         pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
 196 #ifdef DEBUG_PVC
 197         printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
 198 #endif
 199         if (!pvc)
 200                 return NULL;
 201
 202         pvc->dlci = dlci;
 203         pvc->frad = dev;
 204         pvc->next = *pvc_p;     /* Put it in the chain */
 205         *pvc_p = pvc;
 206         return pvc;
 207 }
 208
 209 static inline int pvc_is_used(struct pvc_device *pvc)
 210 {
 211         return pvc->main || pvc->ether;
 212 }
 213
 214 static inline void pvc_carrier(int on, struct pvc_device *pvc)
 215 {
 216         if (on) {
 217                 if (pvc->main)
 218                         if (!netif_carrier_ok(pvc->main))
 219                                 netif_carrier_on(pvc->main);
 220                 if (pvc->ether)
 221                         if (!netif_carrier_ok(pvc->ether))
 222                                 netif_carrier_on(pvc->ether);
 223         } else {
 224                 if (pvc->main)
 225                         if (netif_carrier_ok(pvc->main))
 226                                 netif_carrier_off(pvc->main);
 227                 if (pvc->ether)
 228                         if (netif_carrier_ok(pvc->ether))
 229                                 netif_carrier_off(pvc->ether);
 230         }
 231 }
 232
 233 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 234 {
 235         struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
 236
 237         while (*pvc_p) {
 238                 if (!pvc_is_used(*pvc_p)) {
 239                         struct pvc_device *pvc = *pvc_p;
 240 #ifdef DEBUG_PVC
 241                         printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
 242 #endif
 243                         *pvc_p = pvc->next;
 244                         kfree(pvc);
 245                         continue;
 246                 }
 247                 pvc_p = &(*pvc_p)->next;
 248         }
 249 }
 250
 251 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
 252                                             int type)
 253 {
 254         if (type == ARPHRD_ETHER)
 255                 return &pvc->ether;
 256         else
 257                 return &pvc->main;
 258 }
 259
 260 static int fr_hard_header(struct sk_buff *skb, u16 dlci)
 261 {
 262         if (!skb->dev) { /* Control packets */
 263                 switch (dlci) {
 264                 case LMI_CCITT_ANSI_DLCI:
 265                         skb_push(skb, 4);
 266                         skb->data[3] = NLPID_CCITT_ANSI_LMI;
 267                         break;
 268
 269                 case LMI_CISCO_DLCI:
 270                         skb_push(skb, 4);
 271                         skb->data[3] = NLPID_CISCO_LMI;
 272                         break;
 273
 274                 default:
 275                         return -EINVAL;
 276                 }
 277
 278         } else if (skb->dev->type == ARPHRD_DLCI) {
 279                 switch (skb->protocol) {
 280                 case htons(ETH_P_IP):
 281                         skb_push(skb, 4);
 282                         skb->data[3] = NLPID_IP;
 283                         break;
 284
 285                 case htons(ETH_P_IPV6):
 286                         skb_push(skb, 4);
 287                         skb->data[3] = NLPID_IPV6;
 288                         break;
 289
 290                 default:
 291                         skb_push(skb, 10);
 292                         skb->data[3] = FR_PAD;
 293                         skb->data[4] = NLPID_SNAP;
 294                         /* OUI 00-00-00 indicates an Ethertype follows */
 295                         skb->data[5] = 0x00;
 296                         skb->data[6] = 0x00;
 297                         skb->data[7] = 0x00;
 298                         /* This should be an Ethertype: */
 299                         *(__be16 *)(skb->data + 8) = skb->protocol;
 300                 }
 301
 302         } else if (skb->dev->type == ARPHRD_ETHER) {
 303                 skb_push(skb, 10);
 304                 skb->data[3] = FR_PAD;
 305                 skb->data[4] = NLPID_SNAP;
 306                 /* OUI 00-80-C2 stands for the 802.1 organization */
 307                 skb->data[5] = 0x00;
 308                 skb->data[6] = 0x80;
 309                 skb->data[7] = 0xC2;
 310                 /* PID 00-07 stands for Ethernet frames without FCS */
 311                 skb->data[8] = 0x00;
 312                 skb->data[9] = 0x07;
 313
 314         } else {
 315                 return -EINVAL;
 316         }
 317
 318         dlci_to_q922(skb->data, dlci);
 319         skb->data[2] = FR_UI;
 320         return 0;
 321 }
 322
 323 static int pvc_open(struct net_device *dev)
 324 {
 325         struct pvc_device *pvc = dev->ml_priv;
 326
 327         if ((pvc->frad->flags & IFF_UP) == 0)
 328                 return -EIO;  /* Frad must be UP in order to activate PVC */
 329
 330         if (pvc->open_count++ == 0) {
 331                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 332
 333                 if (state(hdlc)->settings.lmi == LMI_NONE)
 334                         pvc->state.active = netif_carrier_ok(pvc->frad);
 335
 336                 pvc_carrier(pvc->state.active, pvc);
 337                 state(hdlc)->dce_changed = 1;
 338         }
 339         return 0;
 340 }
 341
 342 static int pvc_close(struct net_device *dev)
 343 {
 344         struct pvc_device *pvc = dev->ml_priv;
 345
 346         if (--pvc->open_count == 0) {
 347                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 348
 349                 if (state(hdlc)->settings.lmi == LMI_NONE)
 350                         pvc->state.active = 0;
 351
 352                 if (state(hdlc)->settings.dce) {
 353                         state(hdlc)->dce_changed = 1;
 354                         pvc->state.active = 0;
 355                 }
 356         }
 357         return 0;
 358 }
 359
 360 static int pvc_ioctl(struct net_device *dev, struct if_settings *ifs)
 361 {
 362         struct pvc_device *pvc = dev->ml_priv;
 363         fr_proto_pvc_info info;
 364
 365         if (ifs->type == IF_GET_PROTO) {
 366                 if (dev->type == ARPHRD_ETHER)
 367                         ifs->type = IF_PROTO_FR_ETH_PVC;
 368                 else
 369                         ifs->type = IF_PROTO_FR_PVC;
 370
 371                 if (ifs->size < sizeof(info)) {
 372                         /* data size wanted */
 373                         ifs->size = sizeof(info);
 374                         return -ENOBUFS;
 375                 }
 376
 377                 info.dlci = pvc->dlci;
 378                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 379                 if (copy_to_user(ifs->ifs_ifsu.fr_pvc_info,
 380                                  &info, sizeof(info)))
 381                         return -EFAULT;
 382                 return 0;
 383         }
 384
 385         return -EINVAL;
 386 }
 387
 388 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 389 {
 390         struct pvc_device *pvc = dev->ml_priv;
 391
 392         if (!pvc->state.active)
 393                 goto drop;
 394
 395         if (dev->type == ARPHRD_ETHER) {
 396                 int pad = ETH_ZLEN - skb->len;
 397
 398                 if (pad > 0) { /* Pad the frame with zeros */
 399                         if (__skb_pad(skb, pad, false))
 400                                 goto drop;
 401                         skb_put(skb, pad);
 402                 }
 403         }
 404
 405         /* We already requested the header space with dev->needed_headroom.
 406          * So this is just a protection in case the upper layer didn't take
 407          * dev->needed_headroom into consideration.
 408          */
 409         if (skb_headroom(skb) < 10) {
 410                 struct sk_buff *skb2 = skb_realloc_headroom(skb, 10);
 411
 412                 if (!skb2)
 413                         goto drop;
 414                 dev_kfree_skb(skb);
 415                 skb = skb2;
 416         }
 417
 418         skb->dev = dev;
 419         if (fr_hard_header(skb, pvc->dlci))
 420                 goto drop;
 421
 422         dev->stats.tx_bytes += skb->len;
 423         dev->stats.tx_packets++;
 424         if (pvc->state.fecn) /* TX Congestion counter */
 425                 dev->stats.tx_compressed++;
 426         skb->dev = pvc->frad;
 427         skb->protocol = htons(ETH_P_HDLC);
 428         skb_reset_network_header(skb);
 429         dev_queue_xmit(skb);
 430         return NETDEV_TX_OK;
 431
 432 drop:
 433         dev->stats.tx_dropped++;
 434         kfree_skb(skb);
 435         return NETDEV_TX_OK;
 436 }
 437
 438 static inline void fr_log_dlci_active(struct pvc_device *pvc)
 439 {
 440         netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
 441                     pvc->dlci,
 442                     pvc->main ? pvc->main->name : "",
 443                     pvc->main && pvc->ether ? " " : "",
 444                     pvc->ether ? pvc->ether->name : "",
 445                     pvc->state.new ? " new" : "",
 446                     !pvc->state.exist ? "deleted" :
 447                     pvc->state.active ? "active" : "inactive");
 448 }
 449
 450 static inline u8 fr_lmi_nextseq(u8 x)
 451 {
 452         x++;
 453         return x ? x : 1;
 454 }
 455
 456 static void fr_lmi_send(struct net_device *dev, int fullrep)
 457 {
 458         hdlc_device *hdlc = dev_to_hdlc(dev);
 459         struct sk_buff *skb;
 460         struct pvc_device *pvc = state(hdlc)->first_pvc;
 461         int lmi = state(hdlc)->settings.lmi;
 462         int dce = state(hdlc)->settings.dce;
 463         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 464         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 465         u8 *data;
 466         int i = 0;
 467
 468         if (dce && fullrep) {
 469                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 470                 if (len > HDLC_MAX_MRU) {
 471                         netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
 472                         return;
 473                 }
 474         }
 475
 476         skb = dev_alloc_skb(len);
 477         if (!skb)
 478                 return;
 479
 480         memset(skb->data, 0, len);
 481         skb_reserve(skb, 4);
 482         if (lmi == LMI_CISCO)
 483                 fr_hard_header(skb, LMI_CISCO_DLCI);
 484         else
 485                 fr_hard_header(skb, LMI_CCITT_ANSI_DLCI);
 486
 487         data = skb_tail_pointer(skb);
 488         data[i++] = LMI_CALLREF;
 489         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 490         if (lmi == LMI_ANSI)
 491                 data[i++] = LMI_ANSI_LOCKSHIFT;
 492         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 493                 LMI_ANSI_CISCO_REPTYPE;
 494         data[i++] = LMI_REPT_LEN;
 495         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 496         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 497         data[i++] = LMI_INTEG_LEN;
 498         data[i++] = state(hdlc)->txseq =
 499                 fr_lmi_nextseq(state(hdlc)->txseq);
 500         data[i++] = state(hdlc)->rxseq;
 501
 502         if (dce && fullrep) {
 503                 while (pvc) {
 504                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 505                                 LMI_ANSI_CISCO_PVCSTAT;
 506                         data[i++] = stat_len;
 507
 508                         /* LMI start/restart */
 509                         if (state(hdlc)->reliable && !pvc->state.exist) {
 510                                 pvc->state.exist = pvc->state.new = 1;
 511                                 fr_log_dlci_active(pvc);
 512                         }
 513
 514                         /* ifconfig PVC up */
 515                         if (pvc->open_count && !pvc->state.active &&
 516                             pvc->state.exist && !pvc->state.new) {
 517                                 pvc_carrier(1, pvc);
 518                                 pvc->state.active = 1;
 519                                 fr_log_dlci_active(pvc);
 520                         }
 521
 522                         if (lmi == LMI_CISCO) {
 523                                 data[i] = pvc->dlci >> 8;
 524                                 data[i + 1] = pvc->dlci & 0xFF;
 525                         } else {
 526                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 527                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 528                                 data[i + 2] = 0x80;
 529                         }
 530
 531                         if (pvc->state.new)
 532                                 data[i + 2] |= 0x08;
 533                         else if (pvc->state.active)
 534                                 data[i + 2] |= 0x02;
 535
 536                         i += stat_len;
 537                         pvc = pvc->next;
 538                 }
 539         }
 540
 541         skb_put(skb, i);
 542         skb->priority = TC_PRIO_CONTROL;
 543         skb->dev = dev;
 544         skb->protocol = htons(ETH_P_HDLC);
 545         skb_reset_network_header(skb);
 546
 547         dev_queue_xmit(skb);
 548 }
 549
 550 static void fr_set_link_state(int reliable, struct net_device *dev)
 551 {
 552         hdlc_device *hdlc = dev_to_hdlc(dev);
 553         struct pvc_device *pvc = state(hdlc)->first_pvc;
 554
 555         state(hdlc)->reliable = reliable;
 556         if (reliable) {
 557                 netif_dormant_off(dev);
 558                 state(hdlc)->n391cnt = 0; /* Request full status */
 559                 state(hdlc)->dce_changed = 1;
 560
 561                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 562                         while (pvc) {   /* Activate all PVCs */
 563                                 pvc_carrier(1, pvc);
 564                                 pvc->state.exist = pvc->state.active = 1;
 565                                 pvc->state.new = 0;
 566                                 pvc = pvc->next;
 567                         }
 568                 }
 569         } else {
 570                 netif_dormant_on(dev);
 571                 while (pvc) {           /* Deactivate all PVCs */
 572                         pvc_carrier(0, pvc);
 573                         pvc->state.exist = pvc->state.active = 0;
 574                         pvc->state.new = 0;
 575                         if (!state(hdlc)->settings.dce)
 576                                 pvc->state.bandwidth = 0;
 577                         pvc = pvc->next;
 578                 }
 579         }
 580 }
 581
 582 static void fr_timer(struct timer_list *t)
 583 {
 584         struct frad_state *st = from_timer(st, t, timer);
 585         struct net_device *dev = st->dev;
 586         hdlc_device *hdlc = dev_to_hdlc(dev);
 587         int i, cnt = 0, reliable;
 588         u32 list;
 589
 590         if (state(hdlc)->settings.dce) {
 591                 reliable = state(hdlc)->request &&
 592                         time_before(jiffies, state(hdlc)->last_poll +
 593                                     state(hdlc)->settings.t392 * HZ);
 594                 state(hdlc)->request = 0;
 595         } else {
 596                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 597                 if (state(hdlc)->request) {
 598                         if (state(hdlc)->reliable)
 599                                 netdev_info(dev, "No LMI status reply received\n");
 600                         state(hdlc)->last_errors |= 1;
 601                 }
 602
 603                 list = state(hdlc)->last_errors;
 604                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 605                         cnt += (list & 1);      /* errors count */
 606
 607                 reliable = (cnt < state(hdlc)->settings.n392);
 608         }
 609
 610         if (state(hdlc)->reliable != reliable) {
 611                 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
 612                 fr_set_link_state(reliable, dev);
 613         }
 614
 615         if (state(hdlc)->settings.dce) {
 616                 state(hdlc)->timer.expires = jiffies +
 617                         state(hdlc)->settings.t392 * HZ;
 618         } else {
 619                 if (state(hdlc)->n391cnt)
 620                         state(hdlc)->n391cnt--;
 621
 622                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 623
 624                 state(hdlc)->last_poll = jiffies;
 625                 state(hdlc)->request = 1;
 626                 state(hdlc)->timer.expires = jiffies +
 627                         state(hdlc)->settings.t391 * HZ;
 628         }
 629
 630         add_timer(&state(hdlc)->timer);
 631 }
 632
 633 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 634 {
 635         hdlc_device *hdlc = dev_to_hdlc(dev);
 636         struct pvc_device *pvc;
 637         u8 rxseq, txseq;
 638         int lmi = state(hdlc)->settings.lmi;
 639         int dce = state(hdlc)->settings.dce;
 640         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 641
 642         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 643                         LMI_CCITT_CISCO_LENGTH)) {
 644                 netdev_info(dev, "Short LMI frame\n");
 645                 return 1;
 646         }
 647
 648         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 649                              NLPID_CCITT_ANSI_LMI)) {
 650                 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
 651                 return 1;
 652         }
 653
 654         if (skb->data[4] != LMI_CALLREF) {
 655                 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
 656                             skb->data[4]);
 657                 return 1;
 658         }
 659
 660         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 661                 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
 662                             skb->data[5]);
 663                 return 1;
 664         }
 665
 666         if (lmi == LMI_ANSI) {
 667                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 668                         netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
 669                                     skb->data[6]);
 670                         return 1;
 671                 }
 672                 i = 7;
 673         } else {
 674                 i = 6;
 675         }
 676
 677         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 678                              LMI_ANSI_CISCO_REPTYPE)) {
 679                 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
 680                             skb->data[i]);
 681                 return 1;
 682         }
 683
 684         if (skb->data[++i] != LMI_REPT_LEN) {
 685                 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
 686                             skb->data[i]);
 687                 return 1;
 688         }
 689
 690         reptype = skb->data[++i];
 691         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 692                 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
 693                             reptype);
 694                 return 1;
 695         }
 696
 697         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 698                                LMI_ANSI_CISCO_ALIVE)) {
 699                 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
 700                             skb->data[i]);
 701                 return 1;
 702         }
 703
 704         if (skb->data[++i] != LMI_INTEG_LEN) {
 705                 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
 706                             skb->data[i]);
 707                 return 1;
 708         }
 709         i++;
 710
 711         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 712         rxseq = skb->data[i++]; /* Should confirm our sequence */
 713
 714         txseq = state(hdlc)->txseq;
 715
 716         if (dce)
 717                 state(hdlc)->last_poll = jiffies;
 718
 719         error = 0;
 720         if (!state(hdlc)->reliable)
 721                 error = 1;
 722
 723         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 724                 state(hdlc)->n391cnt = 0;
 725                 error = 1;
 726         }
 727
 728         if (dce) {
 729                 if (state(hdlc)->fullrep_sent && !error) {
 730 /* Stop sending full report - the last one has been confirmed by DTE */
 731                         state(hdlc)->fullrep_sent = 0;
 732                         pvc = state(hdlc)->first_pvc;
 733                         while (pvc) {
 734                                 if (pvc->state.new) {
 735                                         pvc->state.new = 0;
 736
 737 /* Tell DTE that new PVC is now active */
 738                                         state(hdlc)->dce_changed = 1;
 739                                 }
 740                                 pvc = pvc->next;
 741                         }
 742                 }
 743
 744                 if (state(hdlc)->dce_changed) {
 745                         reptype = LMI_FULLREP;
 746                         state(hdlc)->fullrep_sent = 1;
 747                         state(hdlc)->dce_changed = 0;
 748                 }
 749
 750                 state(hdlc)->request = 1; /* got request */
 751                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 752                 return 0;
 753         }
 754
 755         /* DTE */
 756
 757         state(hdlc)->request = 0; /* got response, no request pending */
 758
 759         if (error)
 760                 return 0;
 761
 762         if (reptype != LMI_FULLREP)
 763                 return 0;
 764
 765         pvc = state(hdlc)->first_pvc;
 766
 767         while (pvc) {
 768                 pvc->state.deleted = 1;
 769                 pvc = pvc->next;
 770         }
 771
 772         no_ram = 0;
 773         while (skb->len >= i + 2 + stat_len) {
 774                 u16 dlci;
 775                 u32 bw;
 776                 unsigned int active, new;
 777
 778                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 779                                        LMI_ANSI_CISCO_PVCSTAT)) {
 780                         netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
 781                                     skb->data[i]);
 782                         return 1;
 783                 }
 784
 785                 if (skb->data[++i] != stat_len) {
 786                         netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
 787                                     skb->data[i]);
 788                         return 1;
 789                 }
 790                 i++;
 791
 792                 new = !!(skb->data[i + 2] & 0x08);
 793                 active = !!(skb->data[i + 2] & 0x02);
 794                 if (lmi == LMI_CISCO) {
 795                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 796                         bw = (skb->data[i + 3] << 16) |
 797                                 (skb->data[i + 4] << 8) |
 798                                 (skb->data[i + 5]);
 799                 } else {
 800                         dlci = ((skb->data[i] & 0x3F) << 4) |
 801                                 ((skb->data[i + 1] & 0x78) >> 3);
 802                         bw = 0;
 803                 }
 804
 805                 pvc = add_pvc(dev, dlci);
 806
 807                 if (!pvc && !no_ram) {
 808                         netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
 809                         no_ram = 1;
 810                 }
 811
 812                 if (pvc) {
 813                         pvc->state.exist = 1;
 814                         pvc->state.deleted = 0;
 815                         if (active != pvc->state.active ||
 816                             new != pvc->state.new ||
 817                             bw != pvc->state.bandwidth ||
 818                             !pvc->state.exist) {
 819                                 pvc->state.new = new;
 820                                 pvc->state.active = active;
 821                                 pvc->state.bandwidth = bw;
 822                                 pvc_carrier(active, pvc);
 823                                 fr_log_dlci_active(pvc);
 824                         }
 825                 }
 826
 827                 i += stat_len;
 828         }
 829
 830         pvc = state(hdlc)->first_pvc;
 831
 832         while (pvc) {
 833                 if (pvc->state.deleted && pvc->state.exist) {
 834                         pvc_carrier(0, pvc);
 835                         pvc->state.active = pvc->state.new = 0;
 836                         pvc->state.exist = 0;
 837                         pvc->state.bandwidth = 0;
 838                         fr_log_dlci_active(pvc);
 839                 }
 840                 pvc = pvc->next;
 841         }
 842
 843         /* Next full report after N391 polls */
 844         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 845
 846         return 0;
 847 }
 848
 849 static int fr_snap_parse(struct sk_buff *skb, struct pvc_device *pvc)
 850 {
 851         /* OUI 00-00-00 indicates an Ethertype follows */
 852         if (skb->data[0] == 0x00 &&
 853             skb->data[1] == 0x00 &&
 854             skb->data[2] == 0x00) {
 855                 if (!pvc->main)
 856                         return -1;
 857                 skb->dev = pvc->main;
 858                 skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */
 859                 skb_pull(skb, 5);
 860                 skb_reset_mac_header(skb);
 861                 return 0;
 862
 863         /* OUI 00-80-C2 stands for the 802.1 organization */
 864         } else if (skb->data[0] == 0x00 &&
 865                    skb->data[1] == 0x80 &&
 866                    skb->data[2] == 0xC2) {
 867                 /* PID 00-07 stands for Ethernet frames without FCS */
 868                 if (skb->data[3] == 0x00 &&
 869                     skb->data[4] == 0x07) {
 870                         if (!pvc->ether)
 871                                 return -1;
 872                         skb_pull(skb, 5);
 873                         if (skb->len < ETH_HLEN)
 874                                 return -1;
 875                         skb->protocol = eth_type_trans(skb, pvc->ether);
 876                         return 0;
 877
 878                 /* PID unsupported */
 879                 } else {
 880                         return -1;
 881                 }
 882
 883         /* OUI unsupported */
 884         } else {
 885                 return -1;
 886         }
 887 }
 888
 889 static int fr_rx(struct sk_buff *skb)
 890 {
 891         struct net_device *frad = skb->dev;
 892         hdlc_device *hdlc = dev_to_hdlc(frad);
 893         struct fr_hdr *fh = (struct fr_hdr *)skb->data;
 894         u8 *data = skb->data;
 895         u16 dlci;
 896         struct pvc_device *pvc;
 897         struct net_device *dev;
 898
 899         if (skb->len < 4 || fh->ea1 || !fh->ea2 || data[2] != FR_UI)
 900                 goto rx_error;
 901
 902         dlci = q922_to_dlci(skb->data);
 903
 904         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 905              (state(hdlc)->settings.lmi == LMI_ANSI ||
 906               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 907             (dlci == LMI_CISCO_DLCI &&
 908              state(hdlc)->settings.lmi == LMI_CISCO)) {
 909                 if (fr_lmi_recv(frad, skb))
 910                         goto rx_error;
 911                 dev_kfree_skb_any(skb);
 912                 return NET_RX_SUCCESS;
 913         }
 914
 915         pvc = find_pvc(hdlc, dlci);
 916         if (!pvc) {
 917 #ifdef DEBUG_PKT
 918                 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
 919                             dlci);
 920 #endif
 921                 goto rx_drop;
 922         }
 923
 924         if (pvc->state.fecn != fh->fecn) {
 925 #ifdef DEBUG_ECN
 926                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 927                        dlci, fh->fecn ? "N" : "FF");
 928 #endif
 929                 pvc->state.fecn ^= 1;
 930         }
 931
 932         if (pvc->state.becn != fh->becn) {
 933 #ifdef DEBUG_ECN
 934                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 935                        dlci, fh->becn ? "N" : "FF");
 936 #endif
 937                 pvc->state.becn ^= 1;
 938         }
 939
 940         skb = skb_share_check(skb, GFP_ATOMIC);
 941         if (!skb) {
 942                 frad->stats.rx_dropped++;
 943                 return NET_RX_DROP;
 944         }
 945
 946         if (data[3] == NLPID_IP) {
 947                 if (!pvc->main)
 948                         goto rx_drop;
 949                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 950                 skb->dev = pvc->main;
 951                 skb->protocol = htons(ETH_P_IP);
 952                 skb_reset_mac_header(skb);
 953
 954         } else if (data[3] == NLPID_IPV6) {
 955                 if (!pvc->main)
 956                         goto rx_drop;
 957                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 958                 skb->dev = pvc->main;
 959                 skb->protocol = htons(ETH_P_IPV6);
 960                 skb_reset_mac_header(skb);
 961
 962         } else if (data[3] == FR_PAD) {
 963                 if (skb->len < 5)
 964                         goto rx_error;
 965                 if (data[4] == NLPID_SNAP) { /* A SNAP header follows */
 966                         skb_pull(skb, 5);
 967                         if (skb->len < 5) /* Incomplete SNAP header */
 968                                 goto rx_error;
 969                         if (fr_snap_parse(skb, pvc))
 970                                 goto rx_drop;
 971                 } else {
 972                         goto rx_drop;
 973                 }
 974
 975         } else {
 976                 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
 977                             data[3], skb->len);
 978                 goto rx_drop;
 979         }
 980
 981         dev = skb->dev;
 982         dev->stats.rx_packets++; /* PVC traffic */
 983         dev->stats.rx_bytes += skb->len;
 984         if (pvc->state.becn)
 985                 dev->stats.rx_compressed++;
 986         netif_rx(skb);
 987         return NET_RX_SUCCESS;
 988
 989 rx_error:
 990         frad->stats.rx_errors++; /* Mark error */
 991 rx_drop:
 992         dev_kfree_skb_any(skb);
 993         return NET_RX_DROP;
 994 }
 995
 996 static void fr_start(struct net_device *dev)
 997 {
 998         hdlc_device *hdlc = dev_to_hdlc(dev);
 999 #ifdef DEBUG_LINK
1000         printk(KERN_DEBUG "fr_start\n");
1001 #endif
1002         if (state(hdlc)->settings.lmi != LMI_NONE) {
1003                 state(hdlc)->reliable = 0;
1004                 state(hdlc)->dce_changed = 1;
1005                 state(hdlc)->request = 0;
1006                 state(hdlc)->fullrep_sent = 0;
1007                 state(hdlc)->last_errors = 0xFFFFFFFF;
1008                 state(hdlc)->n391cnt = 0;
1009                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1010
1011                 state(hdlc)->dev = dev;
1012                 timer_setup(&state(hdlc)->timer, fr_timer, 0);
1013                 /* First poll after 1 s */
1014                 state(hdlc)->timer.expires = jiffies + HZ;
1015                 add_timer(&state(hdlc)->timer);
1016         } else {
1017                 fr_set_link_state(1, dev);
1018         }
1019 }
1020
1021 static void fr_stop(struct net_device *dev)
1022 {
1023         hdlc_device *hdlc = dev_to_hdlc(dev);
1024 #ifdef DEBUG_LINK
1025         printk(KERN_DEBUG "fr_stop\n");
1026 #endif
1027         if (state(hdlc)->settings.lmi != LMI_NONE)
1028                 del_timer_sync(&state(hdlc)->timer);
1029         fr_set_link_state(0, dev);
1030 }
1031
1032 static void fr_close(struct net_device *dev)
1033 {
1034         hdlc_device *hdlc = dev_to_hdlc(dev);
1035         struct pvc_device *pvc = state(hdlc)->first_pvc;
1036
1037         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1038                 if (pvc->main)
1039                         dev_close(pvc->main);
1040                 if (pvc->ether)
1041                         dev_close(pvc->ether);
1042                 pvc = pvc->next;
1043         }
1044 }
1045
1046 static void pvc_setup(struct net_device *dev)
1047 {
1048         dev->type = ARPHRD_DLCI;
1049         dev->flags = IFF_POINTOPOINT;
1050         dev->hard_header_len = 0;
1051         dev->addr_len = 2;
1052         netif_keep_dst(dev);
1053 }
1054
1055 static const struct net_device_ops pvc_ops = {
1056         .ndo_open       = pvc_open,
1057         .ndo_stop       = pvc_close,
1058         .ndo_start_xmit = pvc_xmit,
1059         .ndo_siocwandev = pvc_ioctl,
1060 };
1061
1062 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1063 {
1064         hdlc_device *hdlc = dev_to_hdlc(frad);
1065         struct pvc_device *pvc;
1066         struct net_device *dev;
1067         int used;
1068
1069         pvc = add_pvc(frad, dlci);
1070         if (!pvc) {
1071                 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1072                 return -ENOBUFS;
1073         }
1074
1075         if (*get_dev_p(pvc, type))
1076                 return -EEXIST;
1077
1078         used = pvc_is_used(pvc);
1079
1080         if (type == ARPHRD_ETHER)
1081                 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1082                                    ether_setup);
1083         else
1084                 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1085
1086         if (!dev) {
1087                 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1088                 delete_unused_pvcs(hdlc);
1089                 return -ENOBUFS;
1090         }
1091
1092         if (type == ARPHRD_ETHER) {
1093                 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1094                 eth_hw_addr_random(dev);
1095         } else {
1096                 __be16 addr = htons(dlci);
1097
1098                 dev_addr_set(dev, (u8 *)&addr);
1099                 dlci_to_q922(dev->broadcast, dlci);
1100         }
1101         dev->netdev_ops = &pvc_ops;
1102         dev->mtu = HDLC_MAX_MTU;
1103         dev->min_mtu = 68;
1104         dev->max_mtu = HDLC_MAX_MTU;
1105         dev->needed_headroom = 10;
1106         dev->priv_flags |= IFF_NO_QUEUE;
1107         dev->ml_priv = pvc;
1108
1109         if (register_netdevice(dev) != 0) {
1110                 free_netdev(dev);
1111                 delete_unused_pvcs(hdlc);
1112                 return -EIO;
1113         }
1114
1115         dev->needs_free_netdev = true;
1116         *get_dev_p(pvc, type) = dev;
1117         if (!used) {
1118                 state(hdlc)->dce_changed = 1;
1119                 state(hdlc)->dce_pvc_count++;
1120         }
1121         return 0;
1122 }
1123
1124 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1125 {
1126         struct pvc_device *pvc;
1127         struct net_device *dev;
1128
1129         pvc = find_pvc(hdlc, dlci);
1130         if (!pvc)
1131                 return -ENOENT;
1132
1133         dev = *get_dev_p(pvc, type);
1134         if (!dev)
1135                 return -ENOENT;
1136
1137         if (dev->flags & IFF_UP)
1138                 return -EBUSY;          /* PVC in use */
1139
1140         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1141         *get_dev_p(pvc, type) = NULL;
1142
1143         if (!pvc_is_used(pvc)) {
1144                 state(hdlc)->dce_pvc_count--;
1145                 state(hdlc)->dce_changed = 1;
1146         }
1147         delete_unused_pvcs(hdlc);
1148         return 0;
1149 }
1150
1151 static void fr_destroy(struct net_device *frad)
1152 {
1153         hdlc_device *hdlc = dev_to_hdlc(frad);
1154         struct pvc_device *pvc = state(hdlc)->first_pvc;
1155
1156         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1157         state(hdlc)->dce_pvc_count = 0;
1158         state(hdlc)->dce_changed = 1;
1159
1160         while (pvc) {
1161                 struct pvc_device *next = pvc->next;
1162                 /* destructors will free_netdev() main and ether */
1163                 if (pvc->main)
1164                         unregister_netdevice(pvc->main);
1165
1166                 if (pvc->ether)
1167                         unregister_netdevice(pvc->ether);
1168
1169                 kfree(pvc);
1170                 pvc = next;
1171         }
1172 }
1173
1174 static struct hdlc_proto proto = {
1175         .close          = fr_close,
1176         .start          = fr_start,
1177         .stop           = fr_stop,
1178         .detach         = fr_destroy,
1179         .ioctl          = fr_ioctl,
1180         .netif_rx       = fr_rx,
1181         .module         = THIS_MODULE,
1182 };
1183
1184 static int fr_ioctl(struct net_device *dev, struct if_settings *ifs)
1185 {
1186         fr_proto __user *fr_s = ifs->ifs_ifsu.fr;
1187         const size_t size = sizeof(fr_proto);
1188         fr_proto new_settings;
1189         hdlc_device *hdlc = dev_to_hdlc(dev);
1190         fr_proto_pvc pvc;
1191         int result;
1192
1193         switch (ifs->type) {
1194         case IF_GET_PROTO:
1195                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1196                         return -EINVAL;
1197                 ifs->type = IF_PROTO_FR;
1198                 if (ifs->size < size) {
1199                         ifs->size = size; /* data size wanted */
1200                         return -ENOBUFS;
1201                 }
1202                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1203                         return -EFAULT;
1204                 return 0;
1205
1206         case IF_PROTO_FR:
1207                 if (!capable(CAP_NET_ADMIN))
1208                         return -EPERM;
1209
1210                 if (dev->flags & IFF_UP)
1211                         return -EBUSY;
1212
1213                 if (copy_from_user(&new_settings, fr_s, size))
1214                         return -EFAULT;
1215
1216                 if (new_settings.lmi == LMI_DEFAULT)
1217                         new_settings.lmi = LMI_ANSI;
1218
1219                 if ((new_settings.lmi != LMI_NONE &&
1220                      new_settings.lmi != LMI_ANSI &&
1221                      new_settings.lmi != LMI_CCITT &&
1222                      new_settings.lmi != LMI_CISCO) ||
1223                     new_settings.t391 < 1 ||
1224                     new_settings.t392 < 2 ||
1225                     new_settings.n391 < 1 ||
1226                     new_settings.n392 < 1 ||
1227                     new_settings.n393 < new_settings.n392 ||
1228                     new_settings.n393 > 32 ||
1229                     (new_settings.dce != 0 &&
1230                      new_settings.dce != 1))
1231                         return -EINVAL;
1232
1233                 result = hdlc->attach(dev, ENCODING_NRZ,
1234                                       PARITY_CRC16_PR1_CCITT);
1235                 if (result)
1236                         return result;
1237
1238                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1239                         result = attach_hdlc_protocol(dev, &proto,
1240                                                       sizeof(struct frad_state));
1241                         if (result)
1242                                 return result;
1243                         state(hdlc)->first_pvc = NULL;
1244                         state(hdlc)->dce_pvc_count = 0;
1245                 }
1246                 memcpy(&state(hdlc)->settings, &new_settings, size);
1247                 dev->type = ARPHRD_FRAD;
1248                 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1249                 return 0;
1250
1251         case IF_PROTO_FR_ADD_PVC:
1252         case IF_PROTO_FR_DEL_PVC:
1253         case IF_PROTO_FR_ADD_ETH_PVC:
1254         case IF_PROTO_FR_DEL_ETH_PVC:
1255                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1256                         return -EINVAL;
1257
1258                 if (!capable(CAP_NET_ADMIN))
1259                         return -EPERM;
1260
1261                 if (copy_from_user(&pvc, ifs->ifs_ifsu.fr_pvc,
1262                                    sizeof(fr_proto_pvc)))
1263                         return -EFAULT;
1264
1265                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1266                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1267
1268                 if (ifs->type == IF_PROTO_FR_ADD_ETH_PVC ||
1269                     ifs->type == IF_PROTO_FR_DEL_ETH_PVC)
1270                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1271                 else
1272                         result = ARPHRD_DLCI;
1273
1274                 if (ifs->type == IF_PROTO_FR_ADD_PVC ||
1275                     ifs->type == IF_PROTO_FR_ADD_ETH_PVC)
1276                         return fr_add_pvc(dev, pvc.dlci, result);
1277                 else
1278                         return fr_del_pvc(hdlc, pvc.dlci, result);
1279         }
1280
1281         return -EINVAL;
1282 }
1283
1284 static int __init hdlc_fr_init(void)
1285 {
1286         register_hdlc_protocol(&proto);
1287         return 0;
1288 }
1289
1290 static void __exit hdlc_fr_exit(void)
1291 {
1292         unregister_hdlc_protocol(&proto);
1293 }
1294
1295 module_init(hdlc_fr_init);
1296 module_exit(hdlc_fr_exit);
1297
1298 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1299 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1300 MODULE_LICENSE("GPL v2");