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