drivers/net/wan/hdlc_fr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic HDLC support routines for Linux
   4  * Frame Relay support
   5  *
   6  * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
   7  *
   8
   9             Theory of PVC state
  10
  11  DCE mode:
  12
  13  (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
  14          0,x -> 1,1 if "link reliable" when sending FULL STATUS
  15          1,1 -> 1,0 if received FULL STATUS ACK
  16
  17  (active)    -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
  18              -> 1 when "PVC up" and (exist,new) = 1,0
  19
  20  DTE mode:
  21  (exist,new,active) = FULL STATUS if "link reliable"
  22                     = 0, 0, 0 if "link unreliable"
  23  No LMI:
  24  active = open and "link reliable"
  25  exist = new = not used
  26
  27  CCITT LMI: ITU-T Q.933 Annex A
  28  ANSI LMI: ANSI T1.617 Annex D
  29  CISCO LMI: the original, aka "Gang of Four" LMI
  30
  31 */
  32
  33 #include <linux/errno.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/hdlc.h>
  36 #include <linux/if_arp.h>
  37 #include <linux/inetdevice.h>
  38 #include <linux/init.h>
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/pkt_sched.h>
  42 #include <linux/poll.h>
  43 #include <linux/rtnetlink.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/slab.h>
  46
  47 #undef DEBUG_PKT
  48 #undef DEBUG_ECN
  49 #undef DEBUG_LINK
  50 #undef DEBUG_PROTO
  51 #undef DEBUG_PVC
  52
  53 #define FR_UI                   0x03
  54 #define FR_PAD                  0x00
  55
  56 #define NLPID_IP                0xCC
  57 #define NLPID_IPV6              0x8E
  58 #define NLPID_SNAP              0x80
  59 #define NLPID_PAD               0x00
  60 #define NLPID_CCITT_ANSI_LMI    0x08
  61 #define NLPID_CISCO_LMI         0x09
  62
  63
  64 #define LMI_CCITT_ANSI_DLCI        0 /* LMI DLCI */
  65 #define LMI_CISCO_DLCI          1023
  66
  67 #define LMI_CALLREF             0x00 /* Call Reference */
  68 #define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI locking shift */
  69 #define LMI_ANSI_CISCO_REPTYPE  0x01 /* report type */
  70 #define LMI_CCITT_REPTYPE       0x51
  71 #define LMI_ANSI_CISCO_ALIVE    0x03 /* keep alive */
  72 #define LMI_CCITT_ALIVE         0x53
  73 #define LMI_ANSI_CISCO_PVCSTAT  0x07 /* PVC status */
  74 #define LMI_CCITT_PVCSTAT       0x57
  75
  76 #define LMI_FULLREP             0x00 /* full report  */
  77 #define LMI_INTEGRITY           0x01 /* link integrity report */
  78 #define LMI_SINGLE              0x02 /* single PVC report */
  79
  80 #define LMI_STATUS_ENQUIRY      0x75
  81 #define LMI_STATUS              0x7D /* reply */
  82
  83 #define LMI_REPT_LEN               1 /* report type element length */
  84 #define LMI_INTEG_LEN              2 /* link integrity element length */
  85
  86 #define LMI_CCITT_CISCO_LENGTH    13 /* LMI frame lengths */
  87 #define LMI_ANSI_LENGTH           14
  88
  89
  90 struct fr_hdr {
  91 #if defined(__LITTLE_ENDIAN_BITFIELD)
  92         unsigned ea1:   1;
  93         unsigned cr:    1;
  94         unsigned dlcih: 6;
  95
  96         unsigned ea2:   1;
  97         unsigned de:    1;
  98         unsigned becn:  1;
  99         unsigned fecn:  1;
 100         unsigned dlcil: 4;
 101 #else
 102         unsigned dlcih: 6;
 103         unsigned cr:    1;
 104         unsigned ea1:   1;
 105
 106         unsigned dlcil: 4;
 107         unsigned fecn:  1;
 108         unsigned becn:  1;
 109         unsigned de:    1;
 110         unsigned ea2:   1;
 111 #endif
 112 } __packed;
 113
 114
 115 struct pvc_device {
 116         struct net_device *frad;
 117         struct net_device *main;
 118         struct net_device *ether;       /* bridged Ethernet interface   */
 119         struct pvc_device *next;        /* Sorted in ascending DLCI order */
 120         int dlci;
 121         int open_count;
 122
 123         struct {
 124                 unsigned int new: 1;
 125                 unsigned int active: 1;
 126                 unsigned int exist: 1;
 127                 unsigned int deleted: 1;
 128                 unsigned int fecn: 1;
 129                 unsigned int becn: 1;
 130                 unsigned int bandwidth; /* Cisco LMI reporting only */
 131         }state;
 132 };
 133
 134 struct frad_state {
 135         fr_proto settings;
 136         struct pvc_device *first_pvc;
 137         int dce_pvc_count;
 138
 139         struct timer_list timer;
 140         struct net_device *dev;
 141         unsigned long last_poll;
 142         int reliable;
 143         int dce_changed;
 144         int request;
 145         int fullrep_sent;
 146         u32 last_errors; /* last errors bit list */
 147         u8 n391cnt;
 148         u8 txseq; /* TX sequence number */
 149         u8 rxseq; /* RX sequence number */
 150 };
 151
 152
 153 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 154
 155
 156 static inline u16 q922_to_dlci(u8 *hdr)
 157 {
 158         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 159 }
 160
 161
 162 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 163 {
 164         hdr[0] = (dlci >> 2) & 0xFC;
 165         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 166 }
 167
 168
 169 static inline struct frad_state* state(hdlc_device *hdlc)
 170 {
 171         return(struct frad_state *)(hdlc->state);
 172 }
 173
 174
 175 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
 176 {
 177         struct pvc_device *pvc = state(hdlc)->first_pvc;
 178
 179         while (pvc) {
 180                 if (pvc->dlci == dlci)
 181                         return pvc;
 182                 if (pvc->dlci > dlci)
 183                         return NULL; /* the list is sorted */
 184                 pvc = pvc->next;
 185         }
 186
 187         return NULL;
 188 }
 189
 190
 191 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
 192 {
 193         hdlc_device *hdlc = dev_to_hdlc(dev);
 194         struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 195
 196         while (*pvc_p) {
 197                 if ((*pvc_p)->dlci == dlci)
 198                         return *pvc_p;
 199                 if ((*pvc_p)->dlci > dlci)
 200                         break;  /* the list is sorted */
 201                 pvc_p = &(*pvc_p)->next;
 202         }
 203
 204         pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
 205 #ifdef DEBUG_PVC
 206         printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
 207 #endif
 208         if (!pvc)
 209                 return NULL;
 210
 211         pvc->dlci = dlci;
 212         pvc->frad = dev;
 213         pvc->next = *pvc_p;     /* Put it in the chain */
 214         *pvc_p = pvc;
 215         return pvc;
 216 }
 217
 218
 219 static inline int pvc_is_used(struct pvc_device *pvc)
 220 {
 221         return pvc->main || pvc->ether;
 222 }
 223
 224
 225 static inline void pvc_carrier(int on, struct pvc_device *pvc)
 226 {
 227         if (on) {
 228                 if (pvc->main)
 229                         if (!netif_carrier_ok(pvc->main))
 230                                 netif_carrier_on(pvc->main);
 231                 if (pvc->ether)
 232                         if (!netif_carrier_ok(pvc->ether))
 233                                 netif_carrier_on(pvc->ether);
 234         } else {
 235                 if (pvc->main)
 236                         if (netif_carrier_ok(pvc->main))
 237                                 netif_carrier_off(pvc->main);
 238                 if (pvc->ether)
 239                         if (netif_carrier_ok(pvc->ether))
 240                                 netif_carrier_off(pvc->ether);
 241         }
 242 }
 243
 244
 245 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 246 {
 247         struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
 248
 249         while (*pvc_p) {
 250                 if (!pvc_is_used(*pvc_p)) {
 251                         struct pvc_device *pvc = *pvc_p;
 252 #ifdef DEBUG_PVC
 253                         printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
 254 #endif
 255                         *pvc_p = pvc->next;
 256                         kfree(pvc);
 257                         continue;
 258                 }
 259                 pvc_p = &(*pvc_p)->next;
 260         }
 261 }
 262
 263
 264 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
 265                                             int type)
 266 {
 267         if (type == ARPHRD_ETHER)
 268                 return &pvc->ether;
 269         else
 270                 return &pvc->main;
 271 }
 272
 273
 274 static int fr_hard_header(struct sk_buff *skb, u16 dlci)
 275 {
 276         if (!skb->dev) { /* Control packets */
 277                 switch (dlci) {
 278                 case LMI_CCITT_ANSI_DLCI:
 279                         skb_push(skb, 4);
 280                         skb->data[3] = NLPID_CCITT_ANSI_LMI;
 281                         break;
 282
 283                 case LMI_CISCO_DLCI:
 284                         skb_push(skb, 4);
 285                         skb->data[3] = NLPID_CISCO_LMI;
 286                         break;
 287
 288                 default:
 289                         return -EINVAL;
 290                 }
 291
 292         } else if (skb->dev->type == ARPHRD_DLCI) {
 293                 switch (skb->protocol) {
 294                 case htons(ETH_P_IP):
 295                         skb_push(skb, 4);
 296                         skb->data[3] = NLPID_IP;
 297                         break;
 298
 299                 case htons(ETH_P_IPV6):
 300                         skb_push(skb, 4);
 301                         skb->data[3] = NLPID_IPV6;
 302                         break;
 303
 304                 default:
 305                         skb_push(skb, 10);
 306                         skb->data[3] = FR_PAD;
 307                         skb->data[4] = NLPID_SNAP;
 308                         /* OUI 00-00-00 indicates an Ethertype follows */
 309                         skb->data[5] = 0x00;
 310                         skb->data[6] = 0x00;
 311                         skb->data[7] = 0x00;
 312                         /* This should be an Ethertype: */
 313                         *(__be16 *)(skb->data + 8) = skb->protocol;
 314                 }
 315
 316         } else if (skb->dev->type == ARPHRD_ETHER) {
 317                 skb_push(skb, 10);
 318                 skb->data[3] = FR_PAD;
 319                 skb->data[4] = NLPID_SNAP;
 320                 /* OUI 00-80-C2 stands for the 802.1 organization */
 321                 skb->data[5] = 0x00;
 322                 skb->data[6] = 0x80;
 323                 skb->data[7] = 0xC2;
 324                 /* PID 00-07 stands for Ethernet frames without FCS */
 325                 skb->data[8] = 0x00;
 326                 skb->data[9] = 0x07;
 327
 328         } else {
 329                 return -EINVAL;
 330         }
 331
 332         dlci_to_q922(skb->data, dlci);
 333         skb->data[2] = FR_UI;
 334         return 0;
 335 }
 336
 337
 338
 339 static int pvc_open(struct net_device *dev)
 340 {
 341         struct pvc_device *pvc = dev->ml_priv;
 342
 343         if ((pvc->frad->flags & IFF_UP) == 0)
 344                 return -EIO;  /* Frad must be UP in order to activate PVC */
 345
 346         if (pvc->open_count++ == 0) {
 347                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 348                 if (state(hdlc)->settings.lmi == LMI_NONE)
 349                         pvc->state.active = netif_carrier_ok(pvc->frad);
 350
 351                 pvc_carrier(pvc->state.active, pvc);
 352                 state(hdlc)->dce_changed = 1;
 353         }
 354         return 0;
 355 }
 356
 357
 358
 359 static int pvc_close(struct net_device *dev)
 360 {
 361         struct pvc_device *pvc = dev->ml_priv;
 362
 363         if (--pvc->open_count == 0) {
 364                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 365                 if (state(hdlc)->settings.lmi == LMI_NONE)
 366                         pvc->state.active = 0;
 367
 368                 if (state(hdlc)->settings.dce) {
 369                         state(hdlc)->dce_changed = 1;
 370                         pvc->state.active = 0;
 371                 }
 372         }
 373         return 0;
 374 }
 375
 376
 377
 378 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 379 {
 380         struct pvc_device *pvc = dev->ml_priv;
 381         fr_proto_pvc_info info;
 382
 383         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 384                 if (dev->type == ARPHRD_ETHER)
 385                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 386                 else
 387                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 388
 389                 if (ifr->ifr_settings.size < sizeof(info)) {
 390                         /* data size wanted */
 391                         ifr->ifr_settings.size = sizeof(info);
 392                         return -ENOBUFS;
 393                 }
 394
 395                 info.dlci = pvc->dlci;
 396                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 397                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 398                                  &info, sizeof(info)))
 399                         return -EFAULT;
 400                 return 0;
 401         }
 402
 403         return -EINVAL;
 404 }
 405
 406 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 407 {
 408         struct pvc_device *pvc = dev->ml_priv;
 409
 410         if (!pvc->state.active)
 411                 goto drop;
 412
 413         if (dev->type == ARPHRD_ETHER) {
 414                 int pad = ETH_ZLEN - skb->len;
 415
 416                 if (pad > 0) { /* Pad the frame with zeros */
 417                         if (__skb_pad(skb, pad, false))
 418                                 goto drop;
 419                         skb_put(skb, pad);
 420                 }
 421         }
 422
 423         /* We already requested the header space with dev->needed_headroom.
 424          * So this is just a protection in case the upper layer didn't take
 425          * dev->needed_headroom into consideration.
 426          */
 427         if (skb_headroom(skb) < 10) {
 428                 struct sk_buff *skb2 = skb_realloc_headroom(skb, 10);
 429
 430                 if (!skb2)
 431                         goto drop;
 432                 dev_kfree_skb(skb);
 433                 skb = skb2;
 434         }
 435
 436         skb->dev = dev;
 437         if (fr_hard_header(skb, pvc->dlci))
 438                 goto drop;
 439
 440         dev->stats.tx_bytes += skb->len;
 441         dev->stats.tx_packets++;
 442         if (pvc->state.fecn) /* TX Congestion counter */
 443                 dev->stats.tx_compressed++;
 444         skb->dev = pvc->frad;
 445         skb->protocol = htons(ETH_P_HDLC);
 446         skb_reset_network_header(skb);
 447         dev_queue_xmit(skb);
 448         return NETDEV_TX_OK;
 449
 450 drop:
 451         dev->stats.tx_dropped++;
 452         kfree_skb(skb);
 453         return NETDEV_TX_OK;
 454 }
 455
 456 static inline void fr_log_dlci_active(struct pvc_device *pvc)
 457 {
 458         netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
 459                     pvc->dlci,
 460                     pvc->main ? pvc->main->name : "",
 461                     pvc->main && pvc->ether ? " " : "",
 462                     pvc->ether ? pvc->ether->name : "",
 463                     pvc->state.new ? " new" : "",
 464                     !pvc->state.exist ? "deleted" :
 465                     pvc->state.active ? "active" : "inactive");
 466 }
 467
 468
 469
 470 static inline u8 fr_lmi_nextseq(u8 x)
 471 {
 472         x++;
 473         return x ? x : 1;
 474 }
 475
 476
 477 static void fr_lmi_send(struct net_device *dev, int fullrep)
 478 {
 479         hdlc_device *hdlc = dev_to_hdlc(dev);
 480         struct sk_buff *skb;
 481         struct pvc_device *pvc = state(hdlc)->first_pvc;
 482         int lmi = state(hdlc)->settings.lmi;
 483         int dce = state(hdlc)->settings.dce;
 484         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 485         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 486         u8 *data;
 487         int i = 0;
 488
 489         if (dce && fullrep) {
 490                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 491                 if (len > HDLC_MAX_MRU) {
 492                         netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
 493                         return;
 494                 }
 495         }
 496
 497         skb = dev_alloc_skb(len);
 498         if (!skb) {
 499                 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
 500                 return;
 501         }
 502         memset(skb->data, 0, len);
 503         skb_reserve(skb, 4);
 504         if (lmi == LMI_CISCO) {
 505                 fr_hard_header(skb, LMI_CISCO_DLCI);
 506         } else {
 507                 fr_hard_header(skb, LMI_CCITT_ANSI_DLCI);
 508         }
 509         data = skb_tail_pointer(skb);
 510         data[i++] = LMI_CALLREF;
 511         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 512         if (lmi == LMI_ANSI)
 513                 data[i++] = LMI_ANSI_LOCKSHIFT;
 514         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 515                 LMI_ANSI_CISCO_REPTYPE;
 516         data[i++] = LMI_REPT_LEN;
 517         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 518         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 519         data[i++] = LMI_INTEG_LEN;
 520         data[i++] = state(hdlc)->txseq =
 521                 fr_lmi_nextseq(state(hdlc)->txseq);
 522         data[i++] = state(hdlc)->rxseq;
 523
 524         if (dce && fullrep) {
 525                 while (pvc) {
 526                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 527                                 LMI_ANSI_CISCO_PVCSTAT;
 528                         data[i++] = stat_len;
 529
 530                         /* LMI start/restart */
 531                         if (state(hdlc)->reliable && !pvc->state.exist) {
 532                                 pvc->state.exist = pvc->state.new = 1;
 533                                 fr_log_dlci_active(pvc);
 534                         }
 535
 536                         /* ifconfig PVC up */
 537                         if (pvc->open_count && !pvc->state.active &&
 538                             pvc->state.exist && !pvc->state.new) {
 539                                 pvc_carrier(1, pvc);
 540                                 pvc->state.active = 1;
 541                                 fr_log_dlci_active(pvc);
 542                         }
 543
 544                         if (lmi == LMI_CISCO) {
 545                                 data[i] = pvc->dlci >> 8;
 546                                 data[i + 1] = pvc->dlci & 0xFF;
 547                         } else {
 548                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 549                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 550                                 data[i + 2] = 0x80;
 551                         }
 552
 553                         if (pvc->state.new)
 554                                 data[i + 2] |= 0x08;
 555                         else if (pvc->state.active)
 556                                 data[i + 2] |= 0x02;
 557
 558                         i += stat_len;
 559                         pvc = pvc->next;
 560                 }
 561         }
 562
 563         skb_put(skb, i);
 564         skb->priority = TC_PRIO_CONTROL;
 565         skb->dev = dev;
 566         skb->protocol = htons(ETH_P_HDLC);
 567         skb_reset_network_header(skb);
 568
 569         dev_queue_xmit(skb);
 570 }
 571
 572
 573
 574 static void fr_set_link_state(int reliable, struct net_device *dev)
 575 {
 576         hdlc_device *hdlc = dev_to_hdlc(dev);
 577         struct pvc_device *pvc = state(hdlc)->first_pvc;
 578
 579         state(hdlc)->reliable = reliable;
 580         if (reliable) {
 581                 netif_dormant_off(dev);
 582                 state(hdlc)->n391cnt = 0; /* Request full status */
 583                 state(hdlc)->dce_changed = 1;
 584
 585                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 586                         while (pvc) {   /* Activate all PVCs */
 587                                 pvc_carrier(1, pvc);
 588                                 pvc->state.exist = pvc->state.active = 1;
 589                                 pvc->state.new = 0;
 590                                 pvc = pvc->next;
 591                         }
 592                 }
 593         } else {
 594                 netif_dormant_on(dev);
 595                 while (pvc) {           /* Deactivate all PVCs */
 596                         pvc_carrier(0, pvc);
 597                         pvc->state.exist = pvc->state.active = 0;
 598                         pvc->state.new = 0;
 599                         if (!state(hdlc)->settings.dce)
 600                                 pvc->state.bandwidth = 0;
 601                         pvc = pvc->next;
 602                 }
 603         }
 604 }
 605
 606
 607 static void fr_timer(struct timer_list *t)
 608 {
 609         struct frad_state *st = from_timer(st, t, timer);
 610         struct net_device *dev = st->dev;
 611         hdlc_device *hdlc = dev_to_hdlc(dev);
 612         int i, cnt = 0, reliable;
 613         u32 list;
 614
 615         if (state(hdlc)->settings.dce) {
 616                 reliable = state(hdlc)->request &&
 617                         time_before(jiffies, state(hdlc)->last_poll +
 618                                     state(hdlc)->settings.t392 * HZ);
 619                 state(hdlc)->request = 0;
 620         } else {
 621                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 622                 if (state(hdlc)->request) {
 623                         if (state(hdlc)->reliable)
 624                                 netdev_info(dev, "No LMI status reply received\n");
 625                         state(hdlc)->last_errors |= 1;
 626                 }
 627
 628                 list = state(hdlc)->last_errors;
 629                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 630                         cnt += (list & 1);      /* errors count */
 631
 632                 reliable = (cnt < state(hdlc)->settings.n392);
 633         }
 634
 635         if (state(hdlc)->reliable != reliable) {
 636                 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
 637                 fr_set_link_state(reliable, dev);
 638         }
 639
 640         if (state(hdlc)->settings.dce)
 641                 state(hdlc)->timer.expires = jiffies +
 642                         state(hdlc)->settings.t392 * HZ;
 643         else {
 644                 if (state(hdlc)->n391cnt)
 645                         state(hdlc)->n391cnt--;
 646
 647                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 648
 649                 state(hdlc)->last_poll = jiffies;
 650                 state(hdlc)->request = 1;
 651                 state(hdlc)->timer.expires = jiffies +
 652                         state(hdlc)->settings.t391 * HZ;
 653         }
 654
 655         add_timer(&state(hdlc)->timer);
 656 }
 657
 658
 659 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 660 {
 661         hdlc_device *hdlc = dev_to_hdlc(dev);
 662         struct pvc_device *pvc;
 663         u8 rxseq, txseq;
 664         int lmi = state(hdlc)->settings.lmi;
 665         int dce = state(hdlc)->settings.dce;
 666         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 667
 668         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 669                         LMI_CCITT_CISCO_LENGTH)) {
 670                 netdev_info(dev, "Short LMI frame\n");
 671                 return 1;
 672         }
 673
 674         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 675                              NLPID_CCITT_ANSI_LMI)) {
 676                 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
 677                 return 1;
 678         }
 679
 680         if (skb->data[4] != LMI_CALLREF) {
 681                 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
 682                             skb->data[4]);
 683                 return 1;
 684         }
 685
 686         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 687                 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
 688                             skb->data[5]);
 689                 return 1;
 690         }
 691
 692         if (lmi == LMI_ANSI) {
 693                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 694                         netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
 695                                     skb->data[6]);
 696                         return 1;
 697                 }
 698                 i = 7;
 699         } else
 700                 i = 6;
 701
 702         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 703                              LMI_ANSI_CISCO_REPTYPE)) {
 704                 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
 705                             skb->data[i]);
 706                 return 1;
 707         }
 708
 709         if (skb->data[++i] != LMI_REPT_LEN) {
 710                 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
 711                             skb->data[i]);
 712                 return 1;
 713         }
 714
 715         reptype = skb->data[++i];
 716         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 717                 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
 718                             reptype);
 719                 return 1;
 720         }
 721
 722         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 723                                LMI_ANSI_CISCO_ALIVE)) {
 724                 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
 725                             skb->data[i]);
 726                 return 1;
 727         }
 728
 729         if (skb->data[++i] != LMI_INTEG_LEN) {
 730                 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
 731                             skb->data[i]);
 732                 return 1;
 733         }
 734         i++;
 735
 736         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 737         rxseq = skb->data[i++]; /* Should confirm our sequence */
 738
 739         txseq = state(hdlc)->txseq;
 740
 741         if (dce)
 742                 state(hdlc)->last_poll = jiffies;
 743
 744         error = 0;
 745         if (!state(hdlc)->reliable)
 746                 error = 1;
 747
 748         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 749                 state(hdlc)->n391cnt = 0;
 750                 error = 1;
 751         }
 752
 753         if (dce) {
 754                 if (state(hdlc)->fullrep_sent && !error) {
 755 /* Stop sending full report - the last one has been confirmed by DTE */
 756                         state(hdlc)->fullrep_sent = 0;
 757                         pvc = state(hdlc)->first_pvc;
 758                         while (pvc) {
 759                                 if (pvc->state.new) {
 760                                         pvc->state.new = 0;
 761
 762 /* Tell DTE that new PVC is now active */
 763                                         state(hdlc)->dce_changed = 1;
 764                                 }
 765                                 pvc = pvc->next;
 766                         }
 767                 }
 768
 769                 if (state(hdlc)->dce_changed) {
 770                         reptype = LMI_FULLREP;
 771                         state(hdlc)->fullrep_sent = 1;
 772                         state(hdlc)->dce_changed = 0;
 773                 }
 774
 775                 state(hdlc)->request = 1; /* got request */
 776                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 777                 return 0;
 778         }
 779
 780         /* DTE */
 781
 782         state(hdlc)->request = 0; /* got response, no request pending */
 783
 784         if (error)
 785                 return 0;
 786
 787         if (reptype != LMI_FULLREP)
 788                 return 0;
 789
 790         pvc = state(hdlc)->first_pvc;
 791
 792         while (pvc) {
 793                 pvc->state.deleted = 1;
 794                 pvc = pvc->next;
 795         }
 796
 797         no_ram = 0;
 798         while (skb->len >= i + 2 + stat_len) {
 799                 u16 dlci;
 800                 u32 bw;
 801                 unsigned int active, new;
 802
 803                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 804                                        LMI_ANSI_CISCO_PVCSTAT)) {
 805                         netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
 806                                     skb->data[i]);
 807                         return 1;
 808                 }
 809
 810                 if (skb->data[++i] != stat_len) {
 811                         netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
 812                                     skb->data[i]);
 813                         return 1;
 814                 }
 815                 i++;
 816
 817                 new = !! (skb->data[i + 2] & 0x08);
 818                 active = !! (skb->data[i + 2] & 0x02);
 819                 if (lmi == LMI_CISCO) {
 820                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 821                         bw = (skb->data[i + 3] << 16) |
 822                                 (skb->data[i + 4] << 8) |
 823                                 (skb->data[i + 5]);
 824                 } else {
 825                         dlci = ((skb->data[i] & 0x3F) << 4) |
 826                                 ((skb->data[i + 1] & 0x78) >> 3);
 827                         bw = 0;
 828                 }
 829
 830                 pvc = add_pvc(dev, dlci);
 831
 832                 if (!pvc && !no_ram) {
 833                         netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
 834                         no_ram = 1;
 835                 }
 836
 837                 if (pvc) {
 838                         pvc->state.exist = 1;
 839                         pvc->state.deleted = 0;
 840                         if (active != pvc->state.active ||
 841                             new != pvc->state.new ||
 842                             bw != pvc->state.bandwidth ||
 843                             !pvc->state.exist) {
 844                                 pvc->state.new = new;
 845                                 pvc->state.active = active;
 846                                 pvc->state.bandwidth = bw;
 847                                 pvc_carrier(active, pvc);
 848                                 fr_log_dlci_active(pvc);
 849                         }
 850                 }
 851
 852                 i += stat_len;
 853         }
 854
 855         pvc = state(hdlc)->first_pvc;
 856
 857         while (pvc) {
 858                 if (pvc->state.deleted && pvc->state.exist) {
 859                         pvc_carrier(0, pvc);
 860                         pvc->state.active = pvc->state.new = 0;
 861                         pvc->state.exist = 0;
 862                         pvc->state.bandwidth = 0;
 863                         fr_log_dlci_active(pvc);
 864                 }
 865                 pvc = pvc->next;
 866         }
 867
 868         /* Next full report after N391 polls */
 869         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 870
 871         return 0;
 872 }
 873
 874
 875 static int fr_rx(struct sk_buff *skb)
 876 {
 877         struct net_device *frad = skb->dev;
 878         hdlc_device *hdlc = dev_to_hdlc(frad);
 879         struct fr_hdr *fh = (struct fr_hdr *)skb->data;
 880         u8 *data = skb->data;
 881         u16 dlci;
 882         struct pvc_device *pvc;
 883         struct net_device *dev = NULL;
 884
 885         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 886                 goto rx_error;
 887
 888         dlci = q922_to_dlci(skb->data);
 889
 890         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 891              (state(hdlc)->settings.lmi == LMI_ANSI ||
 892               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 893             (dlci == LMI_CISCO_DLCI &&
 894              state(hdlc)->settings.lmi == LMI_CISCO)) {
 895                 if (fr_lmi_recv(frad, skb))
 896                         goto rx_error;
 897                 dev_kfree_skb_any(skb);
 898                 return NET_RX_SUCCESS;
 899         }
 900
 901         pvc = find_pvc(hdlc, dlci);
 902         if (!pvc) {
 903 #ifdef DEBUG_PKT
 904                 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
 905                             dlci);
 906 #endif
 907                 dev_kfree_skb_any(skb);
 908                 return NET_RX_DROP;
 909         }
 910
 911         if (pvc->state.fecn != fh->fecn) {
 912 #ifdef DEBUG_ECN
 913                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 914                        dlci, fh->fecn ? "N" : "FF");
 915 #endif
 916                 pvc->state.fecn ^= 1;
 917         }
 918
 919         if (pvc->state.becn != fh->becn) {
 920 #ifdef DEBUG_ECN
 921                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 922                        dlci, fh->becn ? "N" : "FF");
 923 #endif
 924                 pvc->state.becn ^= 1;
 925         }
 926
 927
 928         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 929                 frad->stats.rx_dropped++;
 930                 return NET_RX_DROP;
 931         }
 932
 933         if (data[3] == NLPID_IP) {
 934                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 935                 dev = pvc->main;
 936                 skb->protocol = htons(ETH_P_IP);
 937
 938         } else if (data[3] == NLPID_IPV6) {
 939                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 940                 dev = pvc->main;
 941                 skb->protocol = htons(ETH_P_IPV6);
 942
 943         } else if (skb->len > 10 && data[3] == FR_PAD &&
 944                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 945                 u16 oui = ntohs(*(__be16*)(data + 6));
 946                 u16 pid = ntohs(*(__be16*)(data + 8));
 947                 skb_pull(skb, 10);
 948
 949                 switch ((((u32)oui) << 16) | pid) {
 950                 case ETH_P_ARP: /* routed frame with SNAP */
 951                 case ETH_P_IPX:
 952                 case ETH_P_IP:  /* a long variant */
 953                 case ETH_P_IPV6:
 954                         dev = pvc->main;
 955                         skb->protocol = htons(pid);
 956                         break;
 957
 958                 case 0x80C20007: /* bridged Ethernet frame */
 959                         if ((dev = pvc->ether) != NULL)
 960                                 skb->protocol = eth_type_trans(skb, dev);
 961                         break;
 962
 963                 default:
 964                         netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
 965                                     oui, pid);
 966                         dev_kfree_skb_any(skb);
 967                         return NET_RX_DROP;
 968                 }
 969         } else {
 970                 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
 971                             data[3], skb->len);
 972                 dev_kfree_skb_any(skb);
 973                 return NET_RX_DROP;
 974         }
 975
 976         if (dev) {
 977                 dev->stats.rx_packets++; /* PVC traffic */
 978                 dev->stats.rx_bytes += skb->len;
 979                 if (pvc->state.becn)
 980                         dev->stats.rx_compressed++;
 981                 skb->dev = dev;
 982                 netif_rx(skb);
 983                 return NET_RX_SUCCESS;
 984         } else {
 985                 dev_kfree_skb_any(skb);
 986                 return NET_RX_DROP;
 987         }
 988
 989  rx_error:
 990         frad->stats.rx_errors++; /* Mark error */
 991         dev_kfree_skb_any(skb);
 992         return NET_RX_DROP;
 993 }
 994
 995
 996
 997 static void fr_start(struct net_device *dev)
 998 {
 999         hdlc_device *hdlc = dev_to_hdlc(dev);
1000 #ifdef DEBUG_LINK
1001         printk(KERN_DEBUG "fr_start\n");
1002 #endif
1003         if (state(hdlc)->settings.lmi != LMI_NONE) {
1004                 state(hdlc)->reliable = 0;
1005                 state(hdlc)->dce_changed = 1;
1006                 state(hdlc)->request = 0;
1007                 state(hdlc)->fullrep_sent = 0;
1008                 state(hdlc)->last_errors = 0xFFFFFFFF;
1009                 state(hdlc)->n391cnt = 0;
1010                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1011
1012                 state(hdlc)->dev = dev;
1013                 timer_setup(&state(hdlc)->timer, fr_timer, 0);
1014                 /* First poll after 1 s */
1015                 state(hdlc)->timer.expires = jiffies + HZ;
1016                 add_timer(&state(hdlc)->timer);
1017         } else
1018                 fr_set_link_state(1, dev);
1019 }
1020
1021
1022 static void fr_stop(struct net_device *dev)
1023 {
1024         hdlc_device *hdlc = dev_to_hdlc(dev);
1025 #ifdef DEBUG_LINK
1026         printk(KERN_DEBUG "fr_stop\n");
1027 #endif
1028         if (state(hdlc)->settings.lmi != LMI_NONE)
1029                 del_timer_sync(&state(hdlc)->timer);
1030         fr_set_link_state(0, dev);
1031 }
1032
1033
1034 static void fr_close(struct net_device *dev)
1035 {
1036         hdlc_device *hdlc = dev_to_hdlc(dev);
1037         struct pvc_device *pvc = state(hdlc)->first_pvc;
1038
1039         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1040                 if (pvc->main)
1041                         dev_close(pvc->main);
1042                 if (pvc->ether)
1043                         dev_close(pvc->ether);
1044                 pvc = pvc->next;
1045         }
1046 }
1047
1048
1049 static void pvc_setup(struct net_device *dev)
1050 {
1051         dev->type = ARPHRD_DLCI;
1052         dev->flags = IFF_POINTOPOINT;
1053         dev->hard_header_len = 0;
1054         dev->addr_len = 2;
1055         netif_keep_dst(dev);
1056 }
1057
1058 static const struct net_device_ops pvc_ops = {
1059         .ndo_open       = pvc_open,
1060         .ndo_stop       = pvc_close,
1061         .ndo_start_xmit = pvc_xmit,
1062         .ndo_do_ioctl   = pvc_ioctl,
1063 };
1064
1065 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1066 {
1067         hdlc_device *hdlc = dev_to_hdlc(frad);
1068         struct pvc_device *pvc;
1069         struct net_device *dev;
1070         int used;
1071
1072         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1073                 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1074                 return -ENOBUFS;
1075         }
1076
1077         if (*get_dev_p(pvc, type))
1078                 return -EEXIST;
1079
1080         used = pvc_is_used(pvc);
1081
1082         if (type == ARPHRD_ETHER)
1083                 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1084                                    ether_setup);
1085         else
1086                 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1087
1088         if (!dev) {
1089                 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1090                 delete_unused_pvcs(hdlc);
1091                 return -ENOBUFS;
1092         }
1093
1094         if (type == ARPHRD_ETHER) {
1095                 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1096                 eth_hw_addr_random(dev);
1097         } else {
1098                 *(__be16*)dev->dev_addr = htons(dlci);
1099                 dlci_to_q922(dev->broadcast, dlci);
1100         }
1101         dev->netdev_ops = &pvc_ops;
1102         dev->mtu = HDLC_MAX_MTU;
1103         dev->min_mtu = 68;
1104         dev->max_mtu = HDLC_MAX_MTU;
1105         dev->needed_headroom = 10;
1106         dev->priv_flags |= IFF_NO_QUEUE;
1107         dev->ml_priv = pvc;
1108
1109         if (register_netdevice(dev) != 0) {
1110                 free_netdev(dev);
1111                 delete_unused_pvcs(hdlc);
1112                 return -EIO;
1113         }
1114
1115         dev->needs_free_netdev = true;
1116         *get_dev_p(pvc, type) = dev;
1117         if (!used) {
1118                 state(hdlc)->dce_changed = 1;
1119                 state(hdlc)->dce_pvc_count++;
1120         }
1121         return 0;
1122 }
1123
1124
1125
1126 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1127 {
1128         struct pvc_device *pvc;
1129         struct net_device *dev;
1130
1131         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1132                 return -ENOENT;
1133
1134         if ((dev = *get_dev_p(pvc, type)) == NULL)
1135                 return -ENOENT;
1136
1137         if (dev->flags & IFF_UP)
1138                 return -EBUSY;          /* PVC in use */
1139
1140         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1141         *get_dev_p(pvc, type) = NULL;
1142
1143         if (!pvc_is_used(pvc)) {
1144                 state(hdlc)->dce_pvc_count--;
1145                 state(hdlc)->dce_changed = 1;
1146         }
1147         delete_unused_pvcs(hdlc);
1148         return 0;
1149 }
1150
1151
1152
1153 static void fr_destroy(struct net_device *frad)
1154 {
1155         hdlc_device *hdlc = dev_to_hdlc(frad);
1156         struct pvc_device *pvc = state(hdlc)->first_pvc;
1157         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1158         state(hdlc)->dce_pvc_count = 0;
1159         state(hdlc)->dce_changed = 1;
1160
1161         while (pvc) {
1162                 struct pvc_device *next = pvc->next;
1163                 /* destructors will free_netdev() main and ether */
1164                 if (pvc->main)
1165                         unregister_netdevice(pvc->main);
1166
1167                 if (pvc->ether)
1168                         unregister_netdevice(pvc->ether);
1169
1170                 kfree(pvc);
1171                 pvc = next;
1172         }
1173 }
1174
1175
1176 static struct hdlc_proto proto = {
1177         .close          = fr_close,
1178         .start          = fr_start,
1179         .stop           = fr_stop,
1180         .detach         = fr_destroy,
1181         .ioctl          = fr_ioctl,
1182         .netif_rx       = fr_rx,
1183         .module         = THIS_MODULE,
1184 };
1185
1186
1187 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1188 {
1189         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1190         const size_t size = sizeof(fr_proto);
1191         fr_proto new_settings;
1192         hdlc_device *hdlc = dev_to_hdlc(dev);
1193         fr_proto_pvc pvc;
1194         int result;
1195
1196         switch (ifr->ifr_settings.type) {
1197         case IF_GET_PROTO:
1198                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1199                         return -EINVAL;
1200                 ifr->ifr_settings.type = IF_PROTO_FR;
1201                 if (ifr->ifr_settings.size < size) {
1202                         ifr->ifr_settings.size = size; /* data size wanted */
1203                         return -ENOBUFS;
1204                 }
1205                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1206                         return -EFAULT;
1207                 return 0;
1208
1209         case IF_PROTO_FR:
1210                 if (!capable(CAP_NET_ADMIN))
1211                         return -EPERM;
1212
1213                 if (dev->flags & IFF_UP)
1214                         return -EBUSY;
1215
1216                 if (copy_from_user(&new_settings, fr_s, size))
1217                         return -EFAULT;
1218
1219                 if (new_settings.lmi == LMI_DEFAULT)
1220                         new_settings.lmi = LMI_ANSI;
1221
1222                 if ((new_settings.lmi != LMI_NONE &&
1223                      new_settings.lmi != LMI_ANSI &&
1224                      new_settings.lmi != LMI_CCITT &&
1225                      new_settings.lmi != LMI_CISCO) ||
1226                     new_settings.t391 < 1 ||
1227                     new_settings.t392 < 2 ||
1228                     new_settings.n391 < 1 ||
1229                     new_settings.n392 < 1 ||
1230                     new_settings.n393 < new_settings.n392 ||
1231                     new_settings.n393 > 32 ||
1232                     (new_settings.dce != 0 &&
1233                      new_settings.dce != 1))
1234                         return -EINVAL;
1235
1236                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1237                 if (result)
1238                         return result;
1239
1240                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1241                         result = attach_hdlc_protocol(dev, &proto,
1242                                                       sizeof(struct frad_state));
1243                         if (result)
1244                                 return result;
1245                         state(hdlc)->first_pvc = NULL;
1246                         state(hdlc)->dce_pvc_count = 0;
1247                 }
1248                 memcpy(&state(hdlc)->settings, &new_settings, size);
1249                 dev->type = ARPHRD_FRAD;
1250                 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1251                 return 0;
1252
1253         case IF_PROTO_FR_ADD_PVC:
1254         case IF_PROTO_FR_DEL_PVC:
1255         case IF_PROTO_FR_ADD_ETH_PVC:
1256         case IF_PROTO_FR_DEL_ETH_PVC:
1257                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1258                         return -EINVAL;
1259
1260                 if (!capable(CAP_NET_ADMIN))
1261                         return -EPERM;
1262
1263                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1264                                    sizeof(fr_proto_pvc)))
1265                         return -EFAULT;
1266
1267                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1268                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1269
1270                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1271                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1272                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1273                 else
1274                         result = ARPHRD_DLCI;
1275
1276                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1277                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1278                         return fr_add_pvc(dev, pvc.dlci, result);
1279                 else
1280                         return fr_del_pvc(hdlc, pvc.dlci, result);
1281         }
1282
1283         return -EINVAL;
1284 }
1285
1286
1287 static int __init mod_init(void)
1288 {
1289         register_hdlc_protocol(&proto);
1290         return 0;
1291 }
1292
1293
1294 static void __exit mod_exit(void)
1295 {
1296         unregister_hdlc_protocol(&proto);
1297 }
1298
1299
1300 module_init(mod_init);
1301 module_exit(mod_exit);
1302
1303 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1304 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1305 MODULE_LICENSE("GPL v2");