drivers/net/wan/hdlc_fr.c

   1 /*
   2  * Generic HDLC support routines for Linux
   3  * Frame Relay support
   4  *
   5  * Copyright (C) 1999 - 2006 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/errno.h>
  37 #include <linux/etherdevice.h>
  38 #include <linux/hdlc.h>
  39 #include <linux/if_arp.h>
  40 #include <linux/inetdevice.h>
  41 #include <linux/init.h>
  42 #include <linux/kernel.h>
  43 #include <linux/module.h>
  44 #include <linux/pkt_sched.h>
  45 #include <linux/poll.h>
  46 #include <linux/rtnetlink.h>
  47 #include <linux/skbuff.h>
  48 #include <linux/slab.h>
  49
  50 #undef DEBUG_PKT
  51 #undef DEBUG_ECN
  52 #undef DEBUG_LINK
  53 #undef DEBUG_PROTO
  54 #undef DEBUG_PVC
  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 typedef struct pvc_device_struct {
 119         struct net_device *frad;
 120         struct net_device *main;
 121         struct net_device *ether;       /* bridged Ethernet interface   */
 122         struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
 123         int dlci;
 124         int open_count;
 125
 126         struct {
 127                 unsigned int new: 1;
 128                 unsigned int active: 1;
 129                 unsigned int exist: 1;
 130                 unsigned int deleted: 1;
 131                 unsigned int fecn: 1;
 132                 unsigned int becn: 1;
 133                 unsigned int bandwidth; /* Cisco LMI reporting only */
 134         }state;
 135 }pvc_device;
 136
 137 struct frad_state {
 138         fr_proto settings;
 139         pvc_device *first_pvc;
 140         int dce_pvc_count;
 141
 142         struct timer_list timer;
 143         unsigned long last_poll;
 144         int reliable;
 145         int dce_changed;
 146         int request;
 147         int fullrep_sent;
 148         u32 last_errors; /* last errors bit list */
 149         u8 n391cnt;
 150         u8 txseq; /* TX sequence number */
 151         u8 rxseq; /* RX sequence number */
 152 };
 153
 154
 155 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 156
 157
 158 static inline u16 q922_to_dlci(u8 *hdr)
 159 {
 160         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 161 }
 162
 163
 164 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 165 {
 166         hdr[0] = (dlci >> 2) & 0xFC;
 167         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 168 }
 169
 170
 171 static inline struct frad_state* state(hdlc_device *hdlc)
 172 {
 173         return(struct frad_state *)(hdlc->state);
 174 }
 175
 176
 177 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
 178 {
 179         pvc_device *pvc = state(hdlc)->first_pvc;
 180
 181         while (pvc) {
 182                 if (pvc->dlci == dlci)
 183                         return pvc;
 184                 if (pvc->dlci > dlci)
 185                         return NULL; /* the listed is sorted */
 186                 pvc = pvc->next;
 187         }
 188
 189         return NULL;
 190 }
 191
 192
 193 static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
 194 {
 195         hdlc_device *hdlc = dev_to_hdlc(dev);
 196         pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 197
 198         while (*pvc_p) {
 199                 if ((*pvc_p)->dlci == dlci)
 200                         return *pvc_p;
 201                 if ((*pvc_p)->dlci > dlci)
 202                         break;  /* the list is sorted */
 203                 pvc_p = &(*pvc_p)->next;
 204         }
 205
 206         pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
 207 #ifdef DEBUG_PVC
 208         printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
 209 #endif
 210         if (!pvc)
 211                 return NULL;
 212
 213         pvc->dlci = dlci;
 214         pvc->frad = dev;
 215         pvc->next = *pvc_p;     /* Put it in the chain */
 216         *pvc_p = pvc;
 217         return pvc;
 218 }
 219
 220
 221 static inline int pvc_is_used(pvc_device *pvc)
 222 {
 223         return pvc->main || pvc->ether;
 224 }
 225
 226
 227 static inline void pvc_carrier(int on, pvc_device *pvc)
 228 {
 229         if (on) {
 230                 if (pvc->main)
 231                         if (!netif_carrier_ok(pvc->main))
 232                                 netif_carrier_on(pvc->main);
 233                 if (pvc->ether)
 234                         if (!netif_carrier_ok(pvc->ether))
 235                                 netif_carrier_on(pvc->ether);
 236         } else {
 237                 if (pvc->main)
 238                         if (netif_carrier_ok(pvc->main))
 239                                 netif_carrier_off(pvc->main);
 240                 if (pvc->ether)
 241                         if (netif_carrier_ok(pvc->ether))
 242                                 netif_carrier_off(pvc->ether);
 243         }
 244 }
 245
 246
 247 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 248 {
 249         pvc_device **pvc_p = &state(hdlc)->first_pvc;
 250
 251         while (*pvc_p) {
 252                 if (!pvc_is_used(*pvc_p)) {
 253                         pvc_device *pvc = *pvc_p;
 254 #ifdef DEBUG_PVC
 255                         printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
 256 #endif
 257                         *pvc_p = pvc->next;
 258                         kfree(pvc);
 259                         continue;
 260                 }
 261                 pvc_p = &(*pvc_p)->next;
 262         }
 263 }
 264
 265
 266 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
 267 {
 268         if (type == ARPHRD_ETHER)
 269                 return &pvc->ether;
 270         else
 271                 return &pvc->main;
 272 }
 273
 274
 275 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 276 {
 277         u16 head_len;
 278         struct sk_buff *skb = *skb_p;
 279
 280         switch (skb->protocol) {
 281         case __constant_htons(NLPID_CCITT_ANSI_LMI):
 282                 head_len = 4;
 283                 skb_push(skb, head_len);
 284                 skb->data[3] = NLPID_CCITT_ANSI_LMI;
 285                 break;
 286
 287         case __constant_htons(NLPID_CISCO_LMI):
 288                 head_len = 4;
 289                 skb_push(skb, head_len);
 290                 skb->data[3] = NLPID_CISCO_LMI;
 291                 break;
 292
 293         case __constant_htons(ETH_P_IP):
 294                 head_len = 4;
 295                 skb_push(skb, head_len);
 296                 skb->data[3] = NLPID_IP;
 297                 break;
 298
 299         case __constant_htons(ETH_P_IPV6):
 300                 head_len = 4;
 301                 skb_push(skb, head_len);
 302                 skb->data[3] = NLPID_IPV6;
 303                 break;
 304
 305         case __constant_htons(ETH_P_802_3):
 306                 head_len = 10;
 307                 if (skb_headroom(skb) < head_len) {
 308                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 309                                                                     head_len);
 310                         if (!skb2)
 311                                 return -ENOBUFS;
 312                         dev_kfree_skb(skb);
 313                         skb = *skb_p = skb2;
 314                 }
 315                 skb_push(skb, head_len);
 316                 skb->data[3] = FR_PAD;
 317                 skb->data[4] = NLPID_SNAP;
 318                 skb->data[5] = FR_PAD;
 319                 skb->data[6] = 0x80;
 320                 skb->data[7] = 0xC2;
 321                 skb->data[8] = 0x00;
 322                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 323                 break;
 324
 325         default:
 326                 head_len = 10;
 327                 skb_push(skb, head_len);
 328                 skb->data[3] = FR_PAD;
 329                 skb->data[4] = NLPID_SNAP;
 330                 skb->data[5] = FR_PAD;
 331                 skb->data[6] = FR_PAD;
 332                 skb->data[7] = FR_PAD;
 333                 *(__be16*)(skb->data + 8) = skb->protocol;
 334         }
 335
 336         dlci_to_q922(skb->data, dlci);
 337         skb->data[2] = FR_UI;
 338         return 0;
 339 }
 340
 341
 342
 343 static int pvc_open(struct net_device *dev)
 344 {
 345         pvc_device *pvc = dev->ml_priv;
 346
 347         if ((pvc->frad->flags & IFF_UP) == 0)
 348                 return -EIO;  /* Frad must be UP in order to activate PVC */
 349
 350         if (pvc->open_count++ == 0) {
 351                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 352                 if (state(hdlc)->settings.lmi == LMI_NONE)
 353                         pvc->state.active = netif_carrier_ok(pvc->frad);
 354
 355                 pvc_carrier(pvc->state.active, pvc);
 356                 state(hdlc)->dce_changed = 1;
 357         }
 358         return 0;
 359 }
 360
 361
 362
 363 static int pvc_close(struct net_device *dev)
 364 {
 365         pvc_device *pvc = dev->ml_priv;
 366
 367         if (--pvc->open_count == 0) {
 368                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 369                 if (state(hdlc)->settings.lmi == LMI_NONE)
 370                         pvc->state.active = 0;
 371
 372                 if (state(hdlc)->settings.dce) {
 373                         state(hdlc)->dce_changed = 1;
 374                         pvc->state.active = 0;
 375                 }
 376         }
 377         return 0;
 378 }
 379
 380
 381
 382 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 383 {
 384         pvc_device *pvc = dev->ml_priv;
 385         fr_proto_pvc_info info;
 386
 387         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 388                 if (dev->type == ARPHRD_ETHER)
 389                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 390                 else
 391                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 392
 393                 if (ifr->ifr_settings.size < sizeof(info)) {
 394                         /* data size wanted */
 395                         ifr->ifr_settings.size = sizeof(info);
 396                         return -ENOBUFS;
 397                 }
 398
 399                 info.dlci = pvc->dlci;
 400                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 401                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 402                                  &info, sizeof(info)))
 403                         return -EFAULT;
 404                 return 0;
 405         }
 406
 407         return -EINVAL;
 408 }
 409
 410 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 411 {
 412         pvc_device *pvc = dev->ml_priv;
 413
 414         if (pvc->state.active) {
 415                 if (dev->type == ARPHRD_ETHER) {
 416                         int pad = ETH_ZLEN - skb->len;
 417                         if (pad > 0) { /* Pad the frame with zeros */
 418                                 int len = skb->len;
 419                                 if (skb_tailroom(skb) < pad)
 420                                         if (pskb_expand_head(skb, 0, pad,
 421                                                              GFP_ATOMIC)) {
 422                                                 dev->stats.tx_dropped++;
 423                                                 dev_kfree_skb(skb);
 424                                                 return 0;
 425                                         }
 426                                 skb_put(skb, pad);
 427                                 memset(skb->data + len, 0, pad);
 428                         }
 429                         skb->protocol = __constant_htons(ETH_P_802_3);
 430                 }
 431                 if (!fr_hard_header(&skb, pvc->dlci)) {
 432                         dev->stats.tx_bytes += skb->len;
 433                         dev->stats.tx_packets++;
 434                         if (pvc->state.fecn) /* TX Congestion counter */
 435                                 dev->stats.tx_compressed++;
 436                         skb->dev = pvc->frad;
 437                         dev_queue_xmit(skb);
 438                         return 0;
 439                 }
 440         }
 441
 442         dev->stats.tx_dropped++;
 443         dev_kfree_skb(skb);
 444         return 0;
 445 }
 446
 447
 448
 449 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
 450 {
 451         if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
 452                 return -EINVAL;
 453         dev->mtu = new_mtu;
 454         return 0;
 455 }
 456
 457
 458
 459 static inline void fr_log_dlci_active(pvc_device *pvc)
 460 {
 461         printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
 462                pvc->frad->name,
 463                pvc->dlci,
 464                pvc->main ? pvc->main->name : "",
 465                pvc->main && pvc->ether ? " " : "",
 466                pvc->ether ? pvc->ether->name : "",
 467                pvc->state.new ? " new" : "",
 468                !pvc->state.exist ? "deleted" :
 469                pvc->state.active ? "active" : "inactive");
 470 }
 471
 472
 473
 474 static inline u8 fr_lmi_nextseq(u8 x)
 475 {
 476         x++;
 477         return x ? x : 1;
 478 }
 479
 480
 481 static void fr_lmi_send(struct net_device *dev, int fullrep)
 482 {
 483         hdlc_device *hdlc = dev_to_hdlc(dev);
 484         struct sk_buff *skb;
 485         pvc_device *pvc = state(hdlc)->first_pvc;
 486         int lmi = state(hdlc)->settings.lmi;
 487         int dce = state(hdlc)->settings.dce;
 488         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 489         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 490         u8 *data;
 491         int i = 0;
 492
 493         if (dce && fullrep) {
 494                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 495                 if (len > HDLC_MAX_MRU) {
 496                         printk(KERN_WARNING "%s: Too many PVCs while sending "
 497                                "LMI full report\n", dev->name);
 498                         return;
 499                 }
 500         }
 501
 502         skb = dev_alloc_skb(len);
 503         if (!skb) {
 504                 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
 505                        dev->name);
 506                 return;
 507         }
 508         memset(skb->data, 0, len);
 509         skb_reserve(skb, 4);
 510         if (lmi == LMI_CISCO) {
 511                 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
 512                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 513         } else {
 514                 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
 515                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 516         }
 517         data = skb_tail_pointer(skb);
 518         data[i++] = LMI_CALLREF;
 519         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 520         if (lmi == LMI_ANSI)
 521                 data[i++] = LMI_ANSI_LOCKSHIFT;
 522         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 523                 LMI_ANSI_CISCO_REPTYPE;
 524         data[i++] = LMI_REPT_LEN;
 525         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 526         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 527         data[i++] = LMI_INTEG_LEN;
 528         data[i++] = state(hdlc)->txseq =
 529                 fr_lmi_nextseq(state(hdlc)->txseq);
 530         data[i++] = state(hdlc)->rxseq;
 531
 532         if (dce && fullrep) {
 533                 while (pvc) {
 534                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 535                                 LMI_ANSI_CISCO_PVCSTAT;
 536                         data[i++] = stat_len;
 537
 538                         /* LMI start/restart */
 539                         if (state(hdlc)->reliable && !pvc->state.exist) {
 540                                 pvc->state.exist = pvc->state.new = 1;
 541                                 fr_log_dlci_active(pvc);
 542                         }
 543
 544                         /* ifconfig PVC up */
 545                         if (pvc->open_count && !pvc->state.active &&
 546                             pvc->state.exist && !pvc->state.new) {
 547                                 pvc_carrier(1, pvc);
 548                                 pvc->state.active = 1;
 549                                 fr_log_dlci_active(pvc);
 550                         }
 551
 552                         if (lmi == LMI_CISCO) {
 553                                 data[i] = pvc->dlci >> 8;
 554                                 data[i + 1] = pvc->dlci & 0xFF;
 555                         } else {
 556                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 557                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 558                                 data[i + 2] = 0x80;
 559                         }
 560
 561                         if (pvc->state.new)
 562                                 data[i + 2] |= 0x08;
 563                         else if (pvc->state.active)
 564                                 data[i + 2] |= 0x02;
 565
 566                         i += stat_len;
 567                         pvc = pvc->next;
 568                 }
 569         }
 570
 571         skb_put(skb, i);
 572         skb->priority = TC_PRIO_CONTROL;
 573         skb->dev = dev;
 574         skb_reset_network_header(skb);
 575
 576         dev_queue_xmit(skb);
 577 }
 578
 579
 580
 581 static void fr_set_link_state(int reliable, struct net_device *dev)
 582 {
 583         hdlc_device *hdlc = dev_to_hdlc(dev);
 584         pvc_device *pvc = state(hdlc)->first_pvc;
 585
 586         state(hdlc)->reliable = reliable;
 587         if (reliable) {
 588                 netif_dormant_off(dev);
 589                 state(hdlc)->n391cnt = 0; /* Request full status */
 590                 state(hdlc)->dce_changed = 1;
 591
 592                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 593                         while (pvc) {   /* Activate all PVCs */
 594                                 pvc_carrier(1, pvc);
 595                                 pvc->state.exist = pvc->state.active = 1;
 596                                 pvc->state.new = 0;
 597                                 pvc = pvc->next;
 598                         }
 599                 }
 600         } else {
 601                 netif_dormant_on(dev);
 602                 while (pvc) {           /* Deactivate all PVCs */
 603                         pvc_carrier(0, pvc);
 604                         pvc->state.exist = pvc->state.active = 0;
 605                         pvc->state.new = 0;
 606                         if (!state(hdlc)->settings.dce)
 607                                 pvc->state.bandwidth = 0;
 608                         pvc = pvc->next;
 609                 }
 610         }
 611 }
 612
 613
 614 static void fr_timer(unsigned long arg)
 615 {
 616         struct net_device *dev = (struct net_device *)arg;
 617         hdlc_device *hdlc = dev_to_hdlc(dev);
 618         int i, cnt = 0, reliable;
 619         u32 list;
 620
 621         if (state(hdlc)->settings.dce) {
 622                 reliable = state(hdlc)->request &&
 623                         time_before(jiffies, state(hdlc)->last_poll +
 624                                     state(hdlc)->settings.t392 * HZ);
 625                 state(hdlc)->request = 0;
 626         } else {
 627                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 628                 if (state(hdlc)->request) {
 629                         if (state(hdlc)->reliable)
 630                                 printk(KERN_INFO "%s: No LMI status reply "
 631                                        "received\n", dev->name);
 632                         state(hdlc)->last_errors |= 1;
 633                 }
 634
 635                 list = state(hdlc)->last_errors;
 636                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 637                         cnt += (list & 1);      /* errors count */
 638
 639                 reliable = (cnt < state(hdlc)->settings.n392);
 640         }
 641
 642         if (state(hdlc)->reliable != reliable) {
 643                 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
 644                        reliable ? "" : "un");
 645                 fr_set_link_state(reliable, dev);
 646         }
 647
 648         if (state(hdlc)->settings.dce)
 649                 state(hdlc)->timer.expires = jiffies +
 650                         state(hdlc)->settings.t392 * HZ;
 651         else {
 652                 if (state(hdlc)->n391cnt)
 653                         state(hdlc)->n391cnt--;
 654
 655                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 656
 657                 state(hdlc)->last_poll = jiffies;
 658                 state(hdlc)->request = 1;
 659                 state(hdlc)->timer.expires = jiffies +
 660                         state(hdlc)->settings.t391 * HZ;
 661         }
 662
 663         state(hdlc)->timer.function = fr_timer;
 664         state(hdlc)->timer.data = arg;
 665         add_timer(&state(hdlc)->timer);
 666 }
 667
 668
 669 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 670 {
 671         hdlc_device *hdlc = dev_to_hdlc(dev);
 672         pvc_device *pvc;
 673         u8 rxseq, txseq;
 674         int lmi = state(hdlc)->settings.lmi;
 675         int dce = state(hdlc)->settings.dce;
 676         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 677
 678         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 679                         LMI_CCITT_CISCO_LENGTH)) {
 680                 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
 681                 return 1;
 682         }
 683
 684         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 685                              NLPID_CCITT_ANSI_LMI)) {
 686                 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
 687                        dev->name);
 688                 return 1;
 689         }
 690
 691         if (skb->data[4] != LMI_CALLREF) {
 692                 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
 693                        dev->name, skb->data[4]);
 694                 return 1;
 695         }
 696
 697         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 698                 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
 699                        dev->name, skb->data[5]);
 700                 return 1;
 701         }
 702
 703         if (lmi == LMI_ANSI) {
 704                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 705                         printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
 706                                " message (0x%02X)\n", dev->name, skb->data[6]);
 707                         return 1;
 708                 }
 709                 i = 7;
 710         } else
 711                 i = 6;
 712
 713         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 714                              LMI_ANSI_CISCO_REPTYPE)) {
 715                 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
 716                        dev->name, skb->data[i]);
 717                 return 1;
 718         }
 719
 720         if (skb->data[++i] != LMI_REPT_LEN) {
 721                 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
 722                        " (%u)\n", dev->name, skb->data[i]);
 723                 return 1;
 724         }
 725
 726         reptype = skb->data[++i];
 727         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 728                 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
 729                        dev->name, reptype);
 730                 return 1;
 731         }
 732
 733         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 734                                LMI_ANSI_CISCO_ALIVE)) {
 735                 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
 736                        " IE (0x%02X)\n", dev->name, skb->data[i]);
 737                 return 1;
 738         }
 739
 740         if (skb->data[++i] != LMI_INTEG_LEN) {
 741                 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
 742                        " IE length (%u)\n", dev->name, skb->data[i]);
 743                 return 1;
 744         }
 745         i++;
 746
 747         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 748         rxseq = skb->data[i++]; /* Should confirm our sequence */
 749
 750         txseq = state(hdlc)->txseq;
 751
 752         if (dce)
 753                 state(hdlc)->last_poll = jiffies;
 754
 755         error = 0;
 756         if (!state(hdlc)->reliable)
 757                 error = 1;
 758
 759         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 760                 state(hdlc)->n391cnt = 0;
 761                 error = 1;
 762         }
 763
 764         if (dce) {
 765                 if (state(hdlc)->fullrep_sent && !error) {
 766 /* Stop sending full report - the last one has been confirmed by DTE */
 767                         state(hdlc)->fullrep_sent = 0;
 768                         pvc = state(hdlc)->first_pvc;
 769                         while (pvc) {
 770                                 if (pvc->state.new) {
 771                                         pvc->state.new = 0;
 772
 773 /* Tell DTE that new PVC is now active */
 774                                         state(hdlc)->dce_changed = 1;
 775                                 }
 776                                 pvc = pvc->next;
 777                         }
 778                 }
 779
 780                 if (state(hdlc)->dce_changed) {
 781                         reptype = LMI_FULLREP;
 782                         state(hdlc)->fullrep_sent = 1;
 783                         state(hdlc)->dce_changed = 0;
 784                 }
 785
 786                 state(hdlc)->request = 1; /* got request */
 787                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 788                 return 0;
 789         }
 790
 791         /* DTE */
 792
 793         state(hdlc)->request = 0; /* got response, no request pending */
 794
 795         if (error)
 796                 return 0;
 797
 798         if (reptype != LMI_FULLREP)
 799                 return 0;
 800
 801         pvc = state(hdlc)->first_pvc;
 802
 803         while (pvc) {
 804                 pvc->state.deleted = 1;
 805                 pvc = pvc->next;
 806         }
 807
 808         no_ram = 0;
 809         while (skb->len >= i + 2 + stat_len) {
 810                 u16 dlci;
 811                 u32 bw;
 812                 unsigned int active, new;
 813
 814                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 815                                        LMI_ANSI_CISCO_PVCSTAT)) {
 816                         printk(KERN_INFO "%s: Not an LMI PVC status IE"
 817                                " (0x%02X)\n", dev->name, skb->data[i]);
 818                         return 1;
 819                 }
 820
 821                 if (skb->data[++i] != stat_len) {
 822                         printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
 823                                " (%u)\n", dev->name, skb->data[i]);
 824                         return 1;
 825                 }
 826                 i++;
 827
 828                 new = !! (skb->data[i + 2] & 0x08);
 829                 active = !! (skb->data[i + 2] & 0x02);
 830                 if (lmi == LMI_CISCO) {
 831                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 832                         bw = (skb->data[i + 3] << 16) |
 833                                 (skb->data[i + 4] << 8) |
 834                                 (skb->data[i + 5]);
 835                 } else {
 836                         dlci = ((skb->data[i] & 0x3F) << 4) |
 837                                 ((skb->data[i + 1] & 0x78) >> 3);
 838                         bw = 0;
 839                 }
 840
 841                 pvc = add_pvc(dev, dlci);
 842
 843                 if (!pvc && !no_ram) {
 844                         printk(KERN_WARNING
 845                                "%s: Memory squeeze on fr_lmi_recv()\n",
 846                                dev->name);
 847                         no_ram = 1;
 848                 }
 849
 850                 if (pvc) {
 851                         pvc->state.exist = 1;
 852                         pvc->state.deleted = 0;
 853                         if (active != pvc->state.active ||
 854                             new != pvc->state.new ||
 855                             bw != pvc->state.bandwidth ||
 856                             !pvc->state.exist) {
 857                                 pvc->state.new = new;
 858                                 pvc->state.active = active;
 859                                 pvc->state.bandwidth = bw;
 860                                 pvc_carrier(active, pvc);
 861                                 fr_log_dlci_active(pvc);
 862                         }
 863                 }
 864
 865                 i += stat_len;
 866         }
 867
 868         pvc = state(hdlc)->first_pvc;
 869
 870         while (pvc) {
 871                 if (pvc->state.deleted && pvc->state.exist) {
 872                         pvc_carrier(0, pvc);
 873                         pvc->state.active = pvc->state.new = 0;
 874                         pvc->state.exist = 0;
 875                         pvc->state.bandwidth = 0;
 876                         fr_log_dlci_active(pvc);
 877                 }
 878                 pvc = pvc->next;
 879         }
 880
 881         /* Next full report after N391 polls */
 882         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 883
 884         return 0;
 885 }
 886
 887
 888 static int fr_rx(struct sk_buff *skb)
 889 {
 890         struct net_device *frad = skb->dev;
 891         hdlc_device *hdlc = dev_to_hdlc(frad);
 892         fr_hdr *fh = (fr_hdr*)skb->data;
 893         u8 *data = skb->data;
 894         u16 dlci;
 895         pvc_device *pvc;
 896         struct net_device *dev = NULL;
 897
 898         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 899                 goto rx_error;
 900
 901         dlci = q922_to_dlci(skb->data);
 902
 903         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 904              (state(hdlc)->settings.lmi == LMI_ANSI ||
 905               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 906             (dlci == LMI_CISCO_DLCI &&
 907              state(hdlc)->settings.lmi == LMI_CISCO)) {
 908                 if (fr_lmi_recv(frad, skb))
 909                         goto rx_error;
 910                 dev_kfree_skb_any(skb);
 911                 return NET_RX_SUCCESS;
 912         }
 913
 914         pvc = find_pvc(hdlc, dlci);
 915         if (!pvc) {
 916 #ifdef DEBUG_PKT
 917                 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
 918                        frad->name, dlci);
 919 #endif
 920                 dev_kfree_skb_any(skb);
 921                 return NET_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
 941         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 942                 frad->stats.rx_dropped++;
 943                 return NET_RX_DROP;
 944         }
 945
 946         if (data[3] == NLPID_IP) {
 947                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 948                 dev = pvc->main;
 949                 skb->protocol = htons(ETH_P_IP);
 950
 951         } else if (data[3] == NLPID_IPV6) {
 952                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 953                 dev = pvc->main;
 954                 skb->protocol = htons(ETH_P_IPV6);
 955
 956         } else if (skb->len > 10 && data[3] == FR_PAD &&
 957                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 958                 u16 oui = ntohs(*(__be16*)(data + 6));
 959                 u16 pid = ntohs(*(__be16*)(data + 8));
 960                 skb_pull(skb, 10);
 961
 962                 switch ((((u32)oui) << 16) | pid) {
 963                 case ETH_P_ARP: /* routed frame with SNAP */
 964                 case ETH_P_IPX:
 965                 case ETH_P_IP:  /* a long variant */
 966                 case ETH_P_IPV6:
 967                         dev = pvc->main;
 968                         skb->protocol = htons(pid);
 969                         break;
 970
 971                 case 0x80C20007: /* bridged Ethernet frame */
 972                         if ((dev = pvc->ether) != NULL)
 973                                 skb->protocol = eth_type_trans(skb, dev);
 974                         break;
 975
 976                 default:
 977                         printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
 978                                "PID=%x\n", frad->name, oui, pid);
 979                         dev_kfree_skb_any(skb);
 980                         return NET_RX_DROP;
 981                 }
 982         } else {
 983                 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
 984                        "length = %i\n", frad->name, data[3], skb->len);
 985                 dev_kfree_skb_any(skb);
 986                 return NET_RX_DROP;
 987         }
 988
 989         if (dev) {
 990                 dev->stats.rx_packets++; /* PVC traffic */
 991                 dev->stats.rx_bytes += skb->len;
 992                 if (pvc->state.becn)
 993                         dev->stats.rx_compressed++;
 994                 skb->dev = dev;
 995                 netif_rx(skb);
 996                 return NET_RX_SUCCESS;
 997         } else {
 998                 dev_kfree_skb_any(skb);
 999                 return NET_RX_DROP;
1000         }
1001
1002  rx_error:
1003         frad->stats.rx_errors++; /* Mark error */
1004         dev_kfree_skb_any(skb);
1005         return NET_RX_DROP;
1006 }
1007
1008
1009
1010 static void fr_start(struct net_device *dev)
1011 {
1012         hdlc_device *hdlc = dev_to_hdlc(dev);
1013 #ifdef DEBUG_LINK
1014         printk(KERN_DEBUG "fr_start\n");
1015 #endif
1016         if (state(hdlc)->settings.lmi != LMI_NONE) {
1017                 state(hdlc)->reliable = 0;
1018                 state(hdlc)->dce_changed = 1;
1019                 state(hdlc)->request = 0;
1020                 state(hdlc)->fullrep_sent = 0;
1021                 state(hdlc)->last_errors = 0xFFFFFFFF;
1022                 state(hdlc)->n391cnt = 0;
1023                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1024
1025                 init_timer(&state(hdlc)->timer);
1026                 /* First poll after 1 s */
1027                 state(hdlc)->timer.expires = jiffies + HZ;
1028                 state(hdlc)->timer.function = fr_timer;
1029                 state(hdlc)->timer.data = (unsigned long)dev;
1030                 add_timer(&state(hdlc)->timer);
1031         } else
1032                 fr_set_link_state(1, dev);
1033 }
1034
1035
1036 static void fr_stop(struct net_device *dev)
1037 {
1038         hdlc_device *hdlc = dev_to_hdlc(dev);
1039 #ifdef DEBUG_LINK
1040         printk(KERN_DEBUG "fr_stop\n");
1041 #endif
1042         if (state(hdlc)->settings.lmi != LMI_NONE)
1043                 del_timer_sync(&state(hdlc)->timer);
1044         fr_set_link_state(0, dev);
1045 }
1046
1047
1048 static void fr_close(struct net_device *dev)
1049 {
1050         hdlc_device *hdlc = dev_to_hdlc(dev);
1051         pvc_device *pvc = state(hdlc)->first_pvc;
1052
1053         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1054                 if (pvc->main)
1055                         dev_close(pvc->main);
1056                 if (pvc->ether)
1057                         dev_close(pvc->ether);
1058                 pvc = pvc->next;
1059         }
1060 }
1061
1062
1063 static void pvc_setup(struct net_device *dev)
1064 {
1065         dev->type = ARPHRD_DLCI;
1066         dev->flags = IFF_POINTOPOINT;
1067         dev->hard_header_len = 10;
1068         dev->addr_len = 2;
1069 }
1070
1071 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1072 {
1073         hdlc_device *hdlc = dev_to_hdlc(frad);
1074         pvc_device *pvc;
1075         struct net_device *dev;
1076         int result, used;
1077
1078         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1079                 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1080                        frad->name);
1081                 return -ENOBUFS;
1082         }
1083
1084         if (*get_dev_p(pvc, type))
1085                 return -EEXIST;
1086
1087         used = pvc_is_used(pvc);
1088
1089         if (type == ARPHRD_ETHER)
1090                 dev = alloc_netdev(0, "pvceth%d", ether_setup);
1091         else
1092                 dev = alloc_netdev(0, "pvc%d", pvc_setup);
1093
1094         if (!dev) {
1095                 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1096                        frad->name);
1097                 delete_unused_pvcs(hdlc);
1098                 return -ENOBUFS;
1099         }
1100
1101         if (type == ARPHRD_ETHER)
1102                 random_ether_addr(dev->dev_addr);
1103         else {
1104                 *(__be16*)dev->dev_addr = htons(dlci);
1105                 dlci_to_q922(dev->broadcast, dlci);
1106         }
1107         dev->hard_start_xmit = pvc_xmit;
1108         dev->open = pvc_open;
1109         dev->stop = pvc_close;
1110         dev->do_ioctl = pvc_ioctl;
1111         dev->change_mtu = pvc_change_mtu;
1112         dev->mtu = HDLC_MAX_MTU;
1113         dev->tx_queue_len = 0;
1114         dev->ml_priv = pvc;
1115
1116         result = dev_alloc_name(dev, dev->name);
1117         if (result < 0) {
1118                 free_netdev(dev);
1119                 delete_unused_pvcs(hdlc);
1120                 return result;
1121         }
1122
1123         if (register_netdevice(dev) != 0) {
1124                 free_netdev(dev);
1125                 delete_unused_pvcs(hdlc);
1126                 return -EIO;
1127         }
1128
1129         dev->destructor = free_netdev;
1130         *get_dev_p(pvc, type) = dev;
1131         if (!used) {
1132                 state(hdlc)->dce_changed = 1;
1133                 state(hdlc)->dce_pvc_count++;
1134         }
1135         return 0;
1136 }
1137
1138
1139
1140 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1141 {
1142         pvc_device *pvc;
1143         struct net_device *dev;
1144
1145         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1146                 return -ENOENT;
1147
1148         if ((dev = *get_dev_p(pvc, type)) == NULL)
1149                 return -ENOENT;
1150
1151         if (dev->flags & IFF_UP)
1152                 return -EBUSY;          /* PVC in use */
1153
1154         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1155         *get_dev_p(pvc, type) = NULL;
1156
1157         if (!pvc_is_used(pvc)) {
1158                 state(hdlc)->dce_pvc_count--;
1159                 state(hdlc)->dce_changed = 1;
1160         }
1161         delete_unused_pvcs(hdlc);
1162         return 0;
1163 }
1164
1165
1166
1167 static void fr_destroy(struct net_device *frad)
1168 {
1169         hdlc_device *hdlc = dev_to_hdlc(frad);
1170         pvc_device *pvc = state(hdlc)->first_pvc;
1171         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1172         state(hdlc)->dce_pvc_count = 0;
1173         state(hdlc)->dce_changed = 1;
1174
1175         while (pvc) {
1176                 pvc_device *next = pvc->next;
1177                 /* destructors will free_netdev() main and ether */
1178                 if (pvc->main)
1179                         unregister_netdevice(pvc->main);
1180
1181                 if (pvc->ether)
1182                         unregister_netdevice(pvc->ether);
1183
1184                 kfree(pvc);
1185                 pvc = next;
1186         }
1187 }
1188
1189
1190 static struct hdlc_proto proto = {
1191         .close          = fr_close,
1192         .start          = fr_start,
1193         .stop           = fr_stop,
1194         .detach         = fr_destroy,
1195         .ioctl          = fr_ioctl,
1196         .netif_rx       = fr_rx,
1197         .module         = THIS_MODULE,
1198 };
1199
1200
1201 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1202 {
1203         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1204         const size_t size = sizeof(fr_proto);
1205         fr_proto new_settings;
1206         hdlc_device *hdlc = dev_to_hdlc(dev);
1207         fr_proto_pvc pvc;
1208         int result;
1209
1210         switch (ifr->ifr_settings.type) {
1211         case IF_GET_PROTO:
1212                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1213                         return -EINVAL;
1214                 ifr->ifr_settings.type = IF_PROTO_FR;
1215                 if (ifr->ifr_settings.size < size) {
1216                         ifr->ifr_settings.size = size; /* data size wanted */
1217                         return -ENOBUFS;
1218                 }
1219                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1220                         return -EFAULT;
1221                 return 0;
1222
1223         case IF_PROTO_FR:
1224                 if(!capable(CAP_NET_ADMIN))
1225                         return -EPERM;
1226
1227                 if(dev->flags & IFF_UP)
1228                         return -EBUSY;
1229
1230                 if (copy_from_user(&new_settings, fr_s, size))
1231                         return -EFAULT;
1232
1233                 if (new_settings.lmi == LMI_DEFAULT)
1234                         new_settings.lmi = LMI_ANSI;
1235
1236                 if ((new_settings.lmi != LMI_NONE &&
1237                      new_settings.lmi != LMI_ANSI &&
1238                      new_settings.lmi != LMI_CCITT &&
1239                      new_settings.lmi != LMI_CISCO) ||
1240                     new_settings.t391 < 1 ||
1241                     new_settings.t392 < 2 ||
1242                     new_settings.n391 < 1 ||
1243                     new_settings.n392 < 1 ||
1244                     new_settings.n393 < new_settings.n392 ||
1245                     new_settings.n393 > 32 ||
1246                     (new_settings.dce != 0 &&
1247                      new_settings.dce != 1))
1248                         return -EINVAL;
1249
1250                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1251                 if (result)
1252                         return result;
1253
1254                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1255                         result = attach_hdlc_protocol(dev, &proto,
1256                                                       sizeof(struct frad_state));
1257                         if (result)
1258                                 return result;
1259                         state(hdlc)->first_pvc = NULL;
1260                         state(hdlc)->dce_pvc_count = 0;
1261                 }
1262                 memcpy(&state(hdlc)->settings, &new_settings, size);
1263
1264                 dev->hard_start_xmit = hdlc->xmit;
1265                 dev->type = ARPHRD_FRAD;
1266                 return 0;
1267
1268         case IF_PROTO_FR_ADD_PVC:
1269         case IF_PROTO_FR_DEL_PVC:
1270         case IF_PROTO_FR_ADD_ETH_PVC:
1271         case IF_PROTO_FR_DEL_ETH_PVC:
1272                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1273                         return -EINVAL;
1274
1275                 if(!capable(CAP_NET_ADMIN))
1276                         return -EPERM;
1277
1278                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1279                                    sizeof(fr_proto_pvc)))
1280                         return -EFAULT;
1281
1282                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1283                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1284
1285                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1286                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1287                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1288                 else
1289                         result = ARPHRD_DLCI;
1290
1291                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1292                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1293                         return fr_add_pvc(dev, pvc.dlci, result);
1294                 else
1295                         return fr_del_pvc(hdlc, pvc.dlci, result);
1296         }
1297
1298         return -EINVAL;
1299 }
1300
1301
1302 static int __init mod_init(void)
1303 {
1304         register_hdlc_protocol(&proto);
1305         return 0;
1306 }
1307
1308
1309 static void __exit mod_exit(void)
1310 {
1311         unregister_hdlc_protocol(&proto);
1312 }
1313
1314
1315 module_init(mod_init);
1316 module_exit(mod_exit);
1317
1318 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1319 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1320 MODULE_LICENSE("GPL v2");