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 <[email protected]>
   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 struct fr_hdr {
  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 } __packed;
 116
 117
 118 struct pvc_device {
 119         struct net_device *frad;
 120         struct net_device *main;
 121         struct net_device *ether;       /* bridged Ethernet interface   */
 122         struct pvc_device *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 };
 136
 137 struct frad_state {
 138         fr_proto settings;
 139         struct 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 struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
 178 {
 179         struct 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 list is sorted */
 186                 pvc = pvc->next;
 187         }
 188
 189         return NULL;
 190 }
 191
 192
 193 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
 194 {
 195         hdlc_device *hdlc = dev_to_hdlc(dev);
 196         struct 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), 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(struct pvc_device *pvc)
 222 {
 223         return pvc->main || pvc->ether;
 224 }
 225
 226
 227 static inline void pvc_carrier(int on, struct 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         struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
 250
 251         while (*pvc_p) {
 252                 if (!pvc_is_used(*pvc_p)) {
 253                         struct 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(struct pvc_device *pvc,
 267                                             int type)
 268 {
 269         if (type == ARPHRD_ETHER)
 270                 return &pvc->ether;
 271         else
 272                 return &pvc->main;
 273 }
 274
 275
 276 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 277 {
 278         u16 head_len;
 279         struct sk_buff *skb = *skb_p;
 280
 281         switch (skb->protocol) {
 282         case cpu_to_be16(NLPID_CCITT_ANSI_LMI):
 283                 head_len = 4;
 284                 skb_push(skb, head_len);
 285                 skb->data[3] = NLPID_CCITT_ANSI_LMI;
 286                 break;
 287
 288         case cpu_to_be16(NLPID_CISCO_LMI):
 289                 head_len = 4;
 290                 skb_push(skb, head_len);
 291                 skb->data[3] = NLPID_CISCO_LMI;
 292                 break;
 293
 294         case cpu_to_be16(ETH_P_IP):
 295                 head_len = 4;
 296                 skb_push(skb, head_len);
 297                 skb->data[3] = NLPID_IP;
 298                 break;
 299
 300         case cpu_to_be16(ETH_P_IPV6):
 301                 head_len = 4;
 302                 skb_push(skb, head_len);
 303                 skb->data[3] = NLPID_IPV6;
 304                 break;
 305
 306         case cpu_to_be16(ETH_P_802_3):
 307                 head_len = 10;
 308                 if (skb_headroom(skb) < head_len) {
 309                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 310                                                                     head_len);
 311                         if (!skb2)
 312                                 return -ENOBUFS;
 313                         dev_kfree_skb(skb);
 314                         skb = *skb_p = skb2;
 315                 }
 316                 skb_push(skb, head_len);
 317                 skb->data[3] = FR_PAD;
 318                 skb->data[4] = NLPID_SNAP;
 319                 skb->data[5] = FR_PAD;
 320                 skb->data[6] = 0x80;
 321                 skb->data[7] = 0xC2;
 322                 skb->data[8] = 0x00;
 323                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 324                 break;
 325
 326         default:
 327                 head_len = 10;
 328                 skb_push(skb, head_len);
 329                 skb->data[3] = FR_PAD;
 330                 skb->data[4] = NLPID_SNAP;
 331                 skb->data[5] = FR_PAD;
 332                 skb->data[6] = FR_PAD;
 333                 skb->data[7] = FR_PAD;
 334                 *(__be16*)(skb->data + 8) = skb->protocol;
 335         }
 336
 337         dlci_to_q922(skb->data, dlci);
 338         skb->data[2] = FR_UI;
 339         return 0;
 340 }
 341
 342
 343
 344 static int pvc_open(struct net_device *dev)
 345 {
 346         struct pvc_device *pvc = dev->ml_priv;
 347
 348         if ((pvc->frad->flags & IFF_UP) == 0)
 349                 return -EIO;  /* Frad must be UP in order to activate PVC */
 350
 351         if (pvc->open_count++ == 0) {
 352                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 353                 if (state(hdlc)->settings.lmi == LMI_NONE)
 354                         pvc->state.active = netif_carrier_ok(pvc->frad);
 355
 356                 pvc_carrier(pvc->state.active, pvc);
 357                 state(hdlc)->dce_changed = 1;
 358         }
 359         return 0;
 360 }
 361
 362
 363
 364 static int pvc_close(struct net_device *dev)
 365 {
 366         struct pvc_device *pvc = dev->ml_priv;
 367
 368         if (--pvc->open_count == 0) {
 369                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 370                 if (state(hdlc)->settings.lmi == LMI_NONE)
 371                         pvc->state.active = 0;
 372
 373                 if (state(hdlc)->settings.dce) {
 374                         state(hdlc)->dce_changed = 1;
 375                         pvc->state.active = 0;
 376                 }
 377         }
 378         return 0;
 379 }
 380
 381
 382
 383 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 384 {
 385         struct pvc_device *pvc = dev->ml_priv;
 386         fr_proto_pvc_info info;
 387
 388         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 389                 if (dev->type == ARPHRD_ETHER)
 390                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 391                 else
 392                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 393
 394                 if (ifr->ifr_settings.size < sizeof(info)) {
 395                         /* data size wanted */
 396                         ifr->ifr_settings.size = sizeof(info);
 397                         return -ENOBUFS;
 398                 }
 399
 400                 info.dlci = pvc->dlci;
 401                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 402                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 403                                  &info, sizeof(info)))
 404                         return -EFAULT;
 405                 return 0;
 406         }
 407
 408         return -EINVAL;
 409 }
 410
 411 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 412 {
 413         struct pvc_device *pvc = dev->ml_priv;
 414
 415         if (pvc->state.active) {
 416                 if (dev->type == ARPHRD_ETHER) {
 417                         int pad = ETH_ZLEN - skb->len;
 418                         if (pad > 0) { /* Pad the frame with zeros */
 419                                 int len = skb->len;
 420                                 if (skb_tailroom(skb) < pad)
 421                                         if (pskb_expand_head(skb, 0, pad,
 422                                                              GFP_ATOMIC)) {
 423                                                 dev->stats.tx_dropped++;
 424                                                 dev_kfree_skb(skb);
 425                                                 return NETDEV_TX_OK;
 426                                         }
 427                                 skb_put(skb, pad);
 428                                 memset(skb->data + len, 0, pad);
 429                         }
 430                         skb->protocol = cpu_to_be16(ETH_P_802_3);
 431                 }
 432                 if (!fr_hard_header(&skb, pvc->dlci)) {
 433                         dev->stats.tx_bytes += skb->len;
 434                         dev->stats.tx_packets++;
 435                         if (pvc->state.fecn) /* TX Congestion counter */
 436                                 dev->stats.tx_compressed++;
 437                         skb->dev = pvc->frad;
 438                         dev_queue_xmit(skb);
 439                         return NETDEV_TX_OK;
 440                 }
 441         }
 442
 443         dev->stats.tx_dropped++;
 444         dev_kfree_skb(skb);
 445         return NETDEV_TX_OK;
 446 }
 447
 448 static inline void fr_log_dlci_active(struct pvc_device *pvc)
 449 {
 450         netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
 451                     pvc->dlci,
 452                     pvc->main ? pvc->main->name : "",
 453                     pvc->main && pvc->ether ? " " : "",
 454                     pvc->ether ? pvc->ether->name : "",
 455                     pvc->state.new ? " new" : "",
 456                     !pvc->state.exist ? "deleted" :
 457                     pvc->state.active ? "active" : "inactive");
 458 }
 459
 460
 461
 462 static inline u8 fr_lmi_nextseq(u8 x)
 463 {
 464         x++;
 465         return x ? x : 1;
 466 }
 467
 468
 469 static void fr_lmi_send(struct net_device *dev, int fullrep)
 470 {
 471         hdlc_device *hdlc = dev_to_hdlc(dev);
 472         struct sk_buff *skb;
 473         struct pvc_device *pvc = state(hdlc)->first_pvc;
 474         int lmi = state(hdlc)->settings.lmi;
 475         int dce = state(hdlc)->settings.dce;
 476         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 477         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 478         u8 *data;
 479         int i = 0;
 480
 481         if (dce && fullrep) {
 482                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 483                 if (len > HDLC_MAX_MRU) {
 484                         netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
 485                         return;
 486                 }
 487         }
 488
 489         skb = dev_alloc_skb(len);
 490         if (!skb) {
 491                 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
 492                 return;
 493         }
 494         memset(skb->data, 0, len);
 495         skb_reserve(skb, 4);
 496         if (lmi == LMI_CISCO) {
 497                 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
 498                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 499         } else {
 500                 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
 501                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 502         }
 503         data = skb_tail_pointer(skb);
 504         data[i++] = LMI_CALLREF;
 505         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 506         if (lmi == LMI_ANSI)
 507                 data[i++] = LMI_ANSI_LOCKSHIFT;
 508         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 509                 LMI_ANSI_CISCO_REPTYPE;
 510         data[i++] = LMI_REPT_LEN;
 511         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 512         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 513         data[i++] = LMI_INTEG_LEN;
 514         data[i++] = state(hdlc)->txseq =
 515                 fr_lmi_nextseq(state(hdlc)->txseq);
 516         data[i++] = state(hdlc)->rxseq;
 517
 518         if (dce && fullrep) {
 519                 while (pvc) {
 520                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 521                                 LMI_ANSI_CISCO_PVCSTAT;
 522                         data[i++] = stat_len;
 523
 524                         /* LMI start/restart */
 525                         if (state(hdlc)->reliable && !pvc->state.exist) {
 526                                 pvc->state.exist = pvc->state.new = 1;
 527                                 fr_log_dlci_active(pvc);
 528                         }
 529
 530                         /* ifconfig PVC up */
 531                         if (pvc->open_count && !pvc->state.active &&
 532                             pvc->state.exist && !pvc->state.new) {
 533                                 pvc_carrier(1, pvc);
 534                                 pvc->state.active = 1;
 535                                 fr_log_dlci_active(pvc);
 536                         }
 537
 538                         if (lmi == LMI_CISCO) {
 539                                 data[i] = pvc->dlci >> 8;
 540                                 data[i + 1] = pvc->dlci & 0xFF;
 541                         } else {
 542                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 543                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 544                                 data[i + 2] = 0x80;
 545                         }
 546
 547                         if (pvc->state.new)
 548                                 data[i + 2] |= 0x08;
 549                         else if (pvc->state.active)
 550                                 data[i + 2] |= 0x02;
 551
 552                         i += stat_len;
 553                         pvc = pvc->next;
 554                 }
 555         }
 556
 557         skb_put(skb, i);
 558         skb->priority = TC_PRIO_CONTROL;
 559         skb->dev = dev;
 560         skb_reset_network_header(skb);
 561
 562         dev_queue_xmit(skb);
 563 }
 564
 565
 566
 567 static void fr_set_link_state(int reliable, struct net_device *dev)
 568 {
 569         hdlc_device *hdlc = dev_to_hdlc(dev);
 570         struct pvc_device *pvc = state(hdlc)->first_pvc;
 571
 572         state(hdlc)->reliable = reliable;
 573         if (reliable) {
 574                 netif_dormant_off(dev);
 575                 state(hdlc)->n391cnt = 0; /* Request full status */
 576                 state(hdlc)->dce_changed = 1;
 577
 578                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 579                         while (pvc) {   /* Activate all PVCs */
 580                                 pvc_carrier(1, pvc);
 581                                 pvc->state.exist = pvc->state.active = 1;
 582                                 pvc->state.new = 0;
 583                                 pvc = pvc->next;
 584                         }
 585                 }
 586         } else {
 587                 netif_dormant_on(dev);
 588                 while (pvc) {           /* Deactivate all PVCs */
 589                         pvc_carrier(0, pvc);
 590                         pvc->state.exist = pvc->state.active = 0;
 591                         pvc->state.new = 0;
 592                         if (!state(hdlc)->settings.dce)
 593                                 pvc->state.bandwidth = 0;
 594                         pvc = pvc->next;
 595                 }
 596         }
 597 }
 598
 599
 600 static void fr_timer(unsigned long arg)
 601 {
 602         struct net_device *dev = (struct net_device *)arg;
 603         hdlc_device *hdlc = dev_to_hdlc(dev);
 604         int i, cnt = 0, reliable;
 605         u32 list;
 606
 607         if (state(hdlc)->settings.dce) {
 608                 reliable = state(hdlc)->request &&
 609                         time_before(jiffies, state(hdlc)->last_poll +
 610                                     state(hdlc)->settings.t392 * HZ);
 611                 state(hdlc)->request = 0;
 612         } else {
 613                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 614                 if (state(hdlc)->request) {
 615                         if (state(hdlc)->reliable)
 616                                 netdev_info(dev, "No LMI status reply received\n");
 617                         state(hdlc)->last_errors |= 1;
 618                 }
 619
 620                 list = state(hdlc)->last_errors;
 621                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 622                         cnt += (list & 1);      /* errors count */
 623
 624                 reliable = (cnt < state(hdlc)->settings.n392);
 625         }
 626
 627         if (state(hdlc)->reliable != reliable) {
 628                 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
 629                 fr_set_link_state(reliable, dev);
 630         }
 631
 632         if (state(hdlc)->settings.dce)
 633                 state(hdlc)->timer.expires = jiffies +
 634                         state(hdlc)->settings.t392 * HZ;
 635         else {
 636                 if (state(hdlc)->n391cnt)
 637                         state(hdlc)->n391cnt--;
 638
 639                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 640
 641                 state(hdlc)->last_poll = jiffies;
 642                 state(hdlc)->request = 1;
 643                 state(hdlc)->timer.expires = jiffies +
 644                         state(hdlc)->settings.t391 * HZ;
 645         }
 646
 647         state(hdlc)->timer.function = fr_timer;
 648         state(hdlc)->timer.data = arg;
 649         add_timer(&state(hdlc)->timer);
 650 }
 651
 652
 653 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 654 {
 655         hdlc_device *hdlc = dev_to_hdlc(dev);
 656         struct pvc_device *pvc;
 657         u8 rxseq, txseq;
 658         int lmi = state(hdlc)->settings.lmi;
 659         int dce = state(hdlc)->settings.dce;
 660         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 661
 662         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 663                         LMI_CCITT_CISCO_LENGTH)) {
 664                 netdev_info(dev, "Short LMI frame\n");
 665                 return 1;
 666         }
 667
 668         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 669                              NLPID_CCITT_ANSI_LMI)) {
 670                 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
 671                 return 1;
 672         }
 673
 674         if (skb->data[4] != LMI_CALLREF) {
 675                 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
 676                             skb->data[4]);
 677                 return 1;
 678         }
 679
 680         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 681                 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
 682                             skb->data[5]);
 683                 return 1;
 684         }
 685
 686         if (lmi == LMI_ANSI) {
 687                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 688                         netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
 689                                     skb->data[6]);
 690                         return 1;
 691                 }
 692                 i = 7;
 693         } else
 694                 i = 6;
 695
 696         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 697                              LMI_ANSI_CISCO_REPTYPE)) {
 698                 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
 699                             skb->data[i]);
 700                 return 1;
 701         }
 702
 703         if (skb->data[++i] != LMI_REPT_LEN) {
 704                 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
 705                             skb->data[i]);
 706                 return 1;
 707         }
 708
 709         reptype = skb->data[++i];
 710         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 711                 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
 712                             reptype);
 713                 return 1;
 714         }
 715
 716         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 717                                LMI_ANSI_CISCO_ALIVE)) {
 718                 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
 719                             skb->data[i]);
 720                 return 1;
 721         }
 722
 723         if (skb->data[++i] != LMI_INTEG_LEN) {
 724                 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
 725                             skb->data[i]);
 726                 return 1;
 727         }
 728         i++;
 729
 730         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 731         rxseq = skb->data[i++]; /* Should confirm our sequence */
 732
 733         txseq = state(hdlc)->txseq;
 734
 735         if (dce)
 736                 state(hdlc)->last_poll = jiffies;
 737
 738         error = 0;
 739         if (!state(hdlc)->reliable)
 740                 error = 1;
 741
 742         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 743                 state(hdlc)->n391cnt = 0;
 744                 error = 1;
 745         }
 746
 747         if (dce) {
 748                 if (state(hdlc)->fullrep_sent && !error) {
 749 /* Stop sending full report - the last one has been confirmed by DTE */
 750                         state(hdlc)->fullrep_sent = 0;
 751                         pvc = state(hdlc)->first_pvc;
 752                         while (pvc) {
 753                                 if (pvc->state.new) {
 754                                         pvc->state.new = 0;
 755
 756 /* Tell DTE that new PVC is now active */
 757                                         state(hdlc)->dce_changed = 1;
 758                                 }
 759                                 pvc = pvc->next;
 760                         }
 761                 }
 762
 763                 if (state(hdlc)->dce_changed) {
 764                         reptype = LMI_FULLREP;
 765                         state(hdlc)->fullrep_sent = 1;
 766                         state(hdlc)->dce_changed = 0;
 767                 }
 768
 769                 state(hdlc)->request = 1; /* got request */
 770                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 771                 return 0;
 772         }
 773
 774         /* DTE */
 775
 776         state(hdlc)->request = 0; /* got response, no request pending */
 777
 778         if (error)
 779                 return 0;
 780
 781         if (reptype != LMI_FULLREP)
 782                 return 0;
 783
 784         pvc = state(hdlc)->first_pvc;
 785
 786         while (pvc) {
 787                 pvc->state.deleted = 1;
 788                 pvc = pvc->next;
 789         }
 790
 791         no_ram = 0;
 792         while (skb->len >= i + 2 + stat_len) {
 793                 u16 dlci;
 794                 u32 bw;
 795                 unsigned int active, new;
 796
 797                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 798                                        LMI_ANSI_CISCO_PVCSTAT)) {
 799                         netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
 800                                     skb->data[i]);
 801                         return 1;
 802                 }
 803
 804                 if (skb->data[++i] != stat_len) {
 805                         netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
 806                                     skb->data[i]);
 807                         return 1;
 808                 }
 809                 i++;
 810
 811                 new = !! (skb->data[i + 2] & 0x08);
 812                 active = !! (skb->data[i + 2] & 0x02);
 813                 if (lmi == LMI_CISCO) {
 814                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 815                         bw = (skb->data[i + 3] << 16) |
 816                                 (skb->data[i + 4] << 8) |
 817                                 (skb->data[i + 5]);
 818                 } else {
 819                         dlci = ((skb->data[i] & 0x3F) << 4) |
 820                                 ((skb->data[i + 1] & 0x78) >> 3);
 821                         bw = 0;
 822                 }
 823
 824                 pvc = add_pvc(dev, dlci);
 825
 826                 if (!pvc && !no_ram) {
 827                         netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
 828                         no_ram = 1;
 829                 }
 830
 831                 if (pvc) {
 832                         pvc->state.exist = 1;
 833                         pvc->state.deleted = 0;
 834                         if (active != pvc->state.active ||
 835                             new != pvc->state.new ||
 836                             bw != pvc->state.bandwidth ||
 837                             !pvc->state.exist) {
 838                                 pvc->state.new = new;
 839                                 pvc->state.active = active;
 840                                 pvc->state.bandwidth = bw;
 841                                 pvc_carrier(active, pvc);
 842                                 fr_log_dlci_active(pvc);
 843                         }
 844                 }
 845
 846                 i += stat_len;
 847         }
 848
 849         pvc = state(hdlc)->first_pvc;
 850
 851         while (pvc) {
 852                 if (pvc->state.deleted && pvc->state.exist) {
 853                         pvc_carrier(0, pvc);
 854                         pvc->state.active = pvc->state.new = 0;
 855                         pvc->state.exist = 0;
 856                         pvc->state.bandwidth = 0;
 857                         fr_log_dlci_active(pvc);
 858                 }
 859                 pvc = pvc->next;
 860         }
 861
 862         /* Next full report after N391 polls */
 863         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 864
 865         return 0;
 866 }
 867
 868
 869 static int fr_rx(struct sk_buff *skb)
 870 {
 871         struct net_device *frad = skb->dev;
 872         hdlc_device *hdlc = dev_to_hdlc(frad);
 873         struct fr_hdr *fh = (struct fr_hdr *)skb->data;
 874         u8 *data = skb->data;
 875         u16 dlci;
 876         struct pvc_device *pvc;
 877         struct net_device *dev = NULL;
 878
 879         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 880                 goto rx_error;
 881
 882         dlci = q922_to_dlci(skb->data);
 883
 884         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 885              (state(hdlc)->settings.lmi == LMI_ANSI ||
 886               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 887             (dlci == LMI_CISCO_DLCI &&
 888              state(hdlc)->settings.lmi == LMI_CISCO)) {
 889                 if (fr_lmi_recv(frad, skb))
 890                         goto rx_error;
 891                 dev_kfree_skb_any(skb);
 892                 return NET_RX_SUCCESS;
 893         }
 894
 895         pvc = find_pvc(hdlc, dlci);
 896         if (!pvc) {
 897 #ifdef DEBUG_PKT
 898                 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
 899                             dlci);
 900 #endif
 901                 dev_kfree_skb_any(skb);
 902                 return NET_RX_DROP;
 903         }
 904
 905         if (pvc->state.fecn != fh->fecn) {
 906 #ifdef DEBUG_ECN
 907                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 908                        dlci, fh->fecn ? "N" : "FF");
 909 #endif
 910                 pvc->state.fecn ^= 1;
 911         }
 912
 913         if (pvc->state.becn != fh->becn) {
 914 #ifdef DEBUG_ECN
 915                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 916                        dlci, fh->becn ? "N" : "FF");
 917 #endif
 918                 pvc->state.becn ^= 1;
 919         }
 920
 921
 922         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 923                 frad->stats.rx_dropped++;
 924                 return NET_RX_DROP;
 925         }
 926
 927         if (data[3] == NLPID_IP) {
 928                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 929                 dev = pvc->main;
 930                 skb->protocol = htons(ETH_P_IP);
 931
 932         } else if (data[3] == NLPID_IPV6) {
 933                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 934                 dev = pvc->main;
 935                 skb->protocol = htons(ETH_P_IPV6);
 936
 937         } else if (skb->len > 10 && data[3] == FR_PAD &&
 938                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 939                 u16 oui = ntohs(*(__be16*)(data + 6));
 940                 u16 pid = ntohs(*(__be16*)(data + 8));
 941                 skb_pull(skb, 10);
 942
 943                 switch ((((u32)oui) << 16) | pid) {
 944                 case ETH_P_ARP: /* routed frame with SNAP */
 945                 case ETH_P_IPX:
 946                 case ETH_P_IP:  /* a long variant */
 947                 case ETH_P_IPV6:
 948                         dev = pvc->main;
 949                         skb->protocol = htons(pid);
 950                         break;
 951
 952                 case 0x80C20007: /* bridged Ethernet frame */
 953                         if ((dev = pvc->ether) != NULL)
 954                                 skb->protocol = eth_type_trans(skb, dev);
 955                         break;
 956
 957                 default:
 958                         netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
 959                                     oui, pid);
 960                         dev_kfree_skb_any(skb);
 961                         return NET_RX_DROP;
 962                 }
 963         } else {
 964                 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
 965                             data[3], skb->len);
 966                 dev_kfree_skb_any(skb);
 967                 return NET_RX_DROP;
 968         }
 969
 970         if (dev) {
 971                 dev->stats.rx_packets++; /* PVC traffic */
 972                 dev->stats.rx_bytes += skb->len;
 973                 if (pvc->state.becn)
 974                         dev->stats.rx_compressed++;
 975                 skb->dev = dev;
 976                 netif_rx(skb);
 977                 return NET_RX_SUCCESS;
 978         } else {
 979                 dev_kfree_skb_any(skb);
 980                 return NET_RX_DROP;
 981         }
 982
 983  rx_error:
 984         frad->stats.rx_errors++; /* Mark error */
 985         dev_kfree_skb_any(skb);
 986         return NET_RX_DROP;
 987 }
 988
 989
 990
 991 static void fr_start(struct net_device *dev)
 992 {
 993         hdlc_device *hdlc = dev_to_hdlc(dev);
 994 #ifdef DEBUG_LINK
 995         printk(KERN_DEBUG "fr_start\n");
 996 #endif
 997         if (state(hdlc)->settings.lmi != LMI_NONE) {
 998                 state(hdlc)->reliable = 0;
 999                 state(hdlc)->dce_changed = 1;
1000                 state(hdlc)->request = 0;
1001                 state(hdlc)->fullrep_sent = 0;
1002                 state(hdlc)->last_errors = 0xFFFFFFFF;
1003                 state(hdlc)->n391cnt = 0;
1004                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1005
1006                 init_timer(&state(hdlc)->timer);
1007                 /* First poll after 1 s */
1008                 state(hdlc)->timer.expires = jiffies + HZ;
1009                 state(hdlc)->timer.function = fr_timer;
1010                 state(hdlc)->timer.data = (unsigned long)dev;
1011                 add_timer(&state(hdlc)->timer);
1012         } else
1013                 fr_set_link_state(1, dev);
1014 }
1015
1016
1017 static void fr_stop(struct net_device *dev)
1018 {
1019         hdlc_device *hdlc = dev_to_hdlc(dev);
1020 #ifdef DEBUG_LINK
1021         printk(KERN_DEBUG "fr_stop\n");
1022 #endif
1023         if (state(hdlc)->settings.lmi != LMI_NONE)
1024                 del_timer_sync(&state(hdlc)->timer);
1025         fr_set_link_state(0, dev);
1026 }
1027
1028
1029 static void fr_close(struct net_device *dev)
1030 {
1031         hdlc_device *hdlc = dev_to_hdlc(dev);
1032         struct pvc_device *pvc = state(hdlc)->first_pvc;
1033
1034         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1035                 if (pvc->main)
1036                         dev_close(pvc->main);
1037                 if (pvc->ether)
1038                         dev_close(pvc->ether);
1039                 pvc = pvc->next;
1040         }
1041 }
1042
1043
1044 static void pvc_setup(struct net_device *dev)
1045 {
1046         dev->type = ARPHRD_DLCI;
1047         dev->flags = IFF_POINTOPOINT;
1048         dev->hard_header_len = 10;
1049         dev->addr_len = 2;
1050         netif_keep_dst(dev);
1051 }
1052
1053 static const struct net_device_ops pvc_ops = {
1054         .ndo_open       = pvc_open,
1055         .ndo_stop       = pvc_close,
1056         .ndo_change_mtu = hdlc_change_mtu,
1057         .ndo_start_xmit = pvc_xmit,
1058         .ndo_do_ioctl   = pvc_ioctl,
1059 };
1060
1061 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1062 {
1063         hdlc_device *hdlc = dev_to_hdlc(frad);
1064         struct pvc_device *pvc;
1065         struct net_device *dev;
1066         int used;
1067
1068         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1069                 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1070                 return -ENOBUFS;
1071         }
1072
1073         if (*get_dev_p(pvc, type))
1074                 return -EEXIST;
1075
1076         used = pvc_is_used(pvc);
1077
1078         if (type == ARPHRD_ETHER) {
1079                 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1080                                    ether_setup);
1081                 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1082         } else
1083                 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1084
1085         if (!dev) {
1086                 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1087                 delete_unused_pvcs(hdlc);
1088                 return -ENOBUFS;
1089         }
1090
1091         if (type == ARPHRD_ETHER)
1092                 eth_hw_addr_random(dev);
1093         else {
1094                 *(__be16*)dev->dev_addr = htons(dlci);
1095                 dlci_to_q922(dev->broadcast, dlci);
1096         }
1097         dev->netdev_ops = &pvc_ops;
1098         dev->mtu = HDLC_MAX_MTU;
1099         dev->tx_queue_len = 0;
1100         dev->ml_priv = pvc;
1101
1102         if (register_netdevice(dev) != 0) {
1103                 free_netdev(dev);
1104                 delete_unused_pvcs(hdlc);
1105                 return -EIO;
1106         }
1107
1108         dev->destructor = free_netdev;
1109         *get_dev_p(pvc, type) = dev;
1110         if (!used) {
1111                 state(hdlc)->dce_changed = 1;
1112                 state(hdlc)->dce_pvc_count++;
1113         }
1114         return 0;
1115 }
1116
1117
1118
1119 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1120 {
1121         struct pvc_device *pvc;
1122         struct net_device *dev;
1123
1124         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1125                 return -ENOENT;
1126
1127         if ((dev = *get_dev_p(pvc, type)) == NULL)
1128                 return -ENOENT;
1129
1130         if (dev->flags & IFF_UP)
1131                 return -EBUSY;          /* PVC in use */
1132
1133         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1134         *get_dev_p(pvc, type) = NULL;
1135
1136         if (!pvc_is_used(pvc)) {
1137                 state(hdlc)->dce_pvc_count--;
1138                 state(hdlc)->dce_changed = 1;
1139         }
1140         delete_unused_pvcs(hdlc);
1141         return 0;
1142 }
1143
1144
1145
1146 static void fr_destroy(struct net_device *frad)
1147 {
1148         hdlc_device *hdlc = dev_to_hdlc(frad);
1149         struct pvc_device *pvc = state(hdlc)->first_pvc;
1150         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1151         state(hdlc)->dce_pvc_count = 0;
1152         state(hdlc)->dce_changed = 1;
1153
1154         while (pvc) {
1155                 struct pvc_device *next = pvc->next;
1156                 /* destructors will free_netdev() main and ether */
1157                 if (pvc->main)
1158                         unregister_netdevice(pvc->main);
1159
1160                 if (pvc->ether)
1161                         unregister_netdevice(pvc->ether);
1162
1163                 kfree(pvc);
1164                 pvc = next;
1165         }
1166 }
1167
1168
1169 static struct hdlc_proto proto = {
1170         .close          = fr_close,
1171         .start          = fr_start,
1172         .stop           = fr_stop,
1173         .detach         = fr_destroy,
1174         .ioctl          = fr_ioctl,
1175         .netif_rx       = fr_rx,
1176         .module         = THIS_MODULE,
1177 };
1178
1179
1180 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1181 {
1182         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1183         const size_t size = sizeof(fr_proto);
1184         fr_proto new_settings;
1185         hdlc_device *hdlc = dev_to_hdlc(dev);
1186         fr_proto_pvc pvc;
1187         int result;
1188
1189         switch (ifr->ifr_settings.type) {
1190         case IF_GET_PROTO:
1191                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1192                         return -EINVAL;
1193                 ifr->ifr_settings.type = IF_PROTO_FR;
1194                 if (ifr->ifr_settings.size < size) {
1195                         ifr->ifr_settings.size = size; /* data size wanted */
1196                         return -ENOBUFS;
1197                 }
1198                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1199                         return -EFAULT;
1200                 return 0;
1201
1202         case IF_PROTO_FR:
1203                 if (!capable(CAP_NET_ADMIN))
1204                         return -EPERM;
1205
1206                 if (dev->flags & IFF_UP)
1207                         return -EBUSY;
1208
1209                 if (copy_from_user(&new_settings, fr_s, size))
1210                         return -EFAULT;
1211
1212                 if (new_settings.lmi == LMI_DEFAULT)
1213                         new_settings.lmi = LMI_ANSI;
1214
1215                 if ((new_settings.lmi != LMI_NONE &&
1216                      new_settings.lmi != LMI_ANSI &&
1217                      new_settings.lmi != LMI_CCITT &&
1218                      new_settings.lmi != LMI_CISCO) ||
1219                     new_settings.t391 < 1 ||
1220                     new_settings.t392 < 2 ||
1221                     new_settings.n391 < 1 ||
1222                     new_settings.n392 < 1 ||
1223                     new_settings.n393 < new_settings.n392 ||
1224                     new_settings.n393 > 32 ||
1225                     (new_settings.dce != 0 &&
1226                      new_settings.dce != 1))
1227                         return -EINVAL;
1228
1229                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1230                 if (result)
1231                         return result;
1232
1233                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1234                         result = attach_hdlc_protocol(dev, &proto,
1235                                                       sizeof(struct frad_state));
1236                         if (result)
1237                                 return result;
1238                         state(hdlc)->first_pvc = NULL;
1239                         state(hdlc)->dce_pvc_count = 0;
1240                 }
1241                 memcpy(&state(hdlc)->settings, &new_settings, size);
1242                 dev->type = ARPHRD_FRAD;
1243                 return 0;
1244
1245         case IF_PROTO_FR_ADD_PVC:
1246         case IF_PROTO_FR_DEL_PVC:
1247         case IF_PROTO_FR_ADD_ETH_PVC:
1248         case IF_PROTO_FR_DEL_ETH_PVC:
1249                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1250                         return -EINVAL;
1251
1252                 if (!capable(CAP_NET_ADMIN))
1253                         return -EPERM;
1254
1255                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1256                                    sizeof(fr_proto_pvc)))
1257                         return -EFAULT;
1258
1259                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1260                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1261
1262                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1263                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1264                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1265                 else
1266                         result = ARPHRD_DLCI;
1267
1268                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1269                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1270                         return fr_add_pvc(dev, pvc.dlci, result);
1271                 else
1272                         return fr_del_pvc(hdlc, pvc.dlci, result);
1273         }
1274
1275         return -EINVAL;
1276 }
1277
1278
1279 static int __init mod_init(void)
1280 {
1281         register_hdlc_protocol(&proto);
1282         return 0;
1283 }
1284
1285
1286 static void __exit mod_exit(void)
1287 {
1288         unregister_hdlc_protocol(&proto);
1289 }
1290
1291
1292 module_init(mod_init);
1293 module_exit(mod_exit);
1294
1295 MODULE_AUTHOR("Krzysztof Halasa <[email protected]>");
1296 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1297 MODULE_LICENSE("GPL v2");