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_p, u16 dlci)
 275 {
 276         u16 head_len;
 277         struct sk_buff *skb = *skb_p;
 278
 279         switch (skb->protocol) {
 280         case cpu_to_be16(NLPID_CCITT_ANSI_LMI):
 281                 head_len = 4;
 282                 skb_push(skb, head_len);
 283                 skb->data[3] = NLPID_CCITT_ANSI_LMI;
 284                 break;
 285
 286         case cpu_to_be16(NLPID_CISCO_LMI):
 287                 head_len = 4;
 288                 skb_push(skb, head_len);
 289                 skb->data[3] = NLPID_CISCO_LMI;
 290                 break;
 291
 292         case cpu_to_be16(ETH_P_IP):
 293                 head_len = 4;
 294                 skb_push(skb, head_len);
 295                 skb->data[3] = NLPID_IP;
 296                 break;
 297
 298         case cpu_to_be16(ETH_P_IPV6):
 299                 head_len = 4;
 300                 skb_push(skb, head_len);
 301                 skb->data[3] = NLPID_IPV6;
 302                 break;
 303
 304         case cpu_to_be16(ETH_P_802_3):
 305                 head_len = 10;
 306                 if (skb_headroom(skb) < head_len) {
 307                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 308                                                                     head_len);
 309                         if (!skb2)
 310                                 return -ENOBUFS;
 311                         dev_kfree_skb(skb);
 312                         skb = *skb_p = skb2;
 313                 }
 314                 skb_push(skb, head_len);
 315                 skb->data[3] = FR_PAD;
 316                 skb->data[4] = NLPID_SNAP;
 317                 skb->data[5] = FR_PAD;
 318                 skb->data[6] = 0x80;
 319                 skb->data[7] = 0xC2;
 320                 skb->data[8] = 0x00;
 321                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 322                 break;
 323
 324         default:
 325                 head_len = 10;
 326                 skb_push(skb, head_len);
 327                 skb->data[3] = FR_PAD;
 328                 skb->data[4] = NLPID_SNAP;
 329                 skb->data[5] = FR_PAD;
 330                 skb->data[6] = FR_PAD;
 331                 skb->data[7] = FR_PAD;
 332                 *(__be16*)(skb->data + 8) = skb->protocol;
 333         }
 334
 335         dlci_to_q922(skb->data, dlci);
 336         skb->data[2] = FR_UI;
 337         return 0;
 338 }
 339
 340
 341
 342 static int pvc_open(struct net_device *dev)
 343 {
 344         struct pvc_device *pvc = dev->ml_priv;
 345
 346         if ((pvc->frad->flags & IFF_UP) == 0)
 347                 return -EIO;  /* Frad must be UP in order to activate PVC */
 348
 349         if (pvc->open_count++ == 0) {
 350                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 351                 if (state(hdlc)->settings.lmi == LMI_NONE)
 352                         pvc->state.active = netif_carrier_ok(pvc->frad);
 353
 354                 pvc_carrier(pvc->state.active, pvc);
 355                 state(hdlc)->dce_changed = 1;
 356         }
 357         return 0;
 358 }
 359
 360
 361
 362 static int pvc_close(struct net_device *dev)
 363 {
 364         struct pvc_device *pvc = dev->ml_priv;
 365
 366         if (--pvc->open_count == 0) {
 367                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 368                 if (state(hdlc)->settings.lmi == LMI_NONE)
 369                         pvc->state.active = 0;
 370
 371                 if (state(hdlc)->settings.dce) {
 372                         state(hdlc)->dce_changed = 1;
 373                         pvc->state.active = 0;
 374                 }
 375         }
 376         return 0;
 377 }
 378
 379
 380
 381 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 382 {
 383         struct pvc_device *pvc = dev->ml_priv;
 384         fr_proto_pvc_info info;
 385
 386         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 387                 if (dev->type == ARPHRD_ETHER)
 388                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 389                 else
 390                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 391
 392                 if (ifr->ifr_settings.size < sizeof(info)) {
 393                         /* data size wanted */
 394                         ifr->ifr_settings.size = sizeof(info);
 395                         return -ENOBUFS;
 396                 }
 397
 398                 info.dlci = pvc->dlci;
 399                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 400                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 401                                  &info, sizeof(info)))
 402                         return -EFAULT;
 403                 return 0;
 404         }
 405
 406         return -EINVAL;
 407 }
 408
 409 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 410 {
 411         struct pvc_device *pvc = dev->ml_priv;
 412
 413         if (pvc->state.active) {
 414                 if (dev->type == ARPHRD_ETHER) {
 415                         int pad = ETH_ZLEN - skb->len;
 416                         if (pad > 0) { /* Pad the frame with zeros */
 417                                 int len = skb->len;
 418                                 if (skb_tailroom(skb) < pad)
 419                                         if (pskb_expand_head(skb, 0, pad,
 420                                                              GFP_ATOMIC)) {
 421                                                 dev->stats.tx_dropped++;
 422                                                 dev_kfree_skb(skb);
 423                                                 return NETDEV_TX_OK;
 424                                         }
 425                                 skb_put(skb, pad);
 426                                 memset(skb->data + len, 0, pad);
 427                         }
 428                         skb->protocol = cpu_to_be16(ETH_P_802_3);
 429                 }
 430                 if (!fr_hard_header(&skb, pvc->dlci)) {
 431                         dev->stats.tx_bytes += skb->len;
 432                         dev->stats.tx_packets++;
 433                         if (pvc->state.fecn) /* TX Congestion counter */
 434                                 dev->stats.tx_compressed++;
 435                         skb->dev = pvc->frad;
 436                         dev_queue_xmit(skb);
 437                         return NETDEV_TX_OK;
 438                 }
 439         }
 440
 441         dev->stats.tx_dropped++;
 442         dev_kfree_skb(skb);
 443         return NETDEV_TX_OK;
 444 }
 445
 446 static inline void fr_log_dlci_active(struct pvc_device *pvc)
 447 {
 448         netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
 449                     pvc->dlci,
 450                     pvc->main ? pvc->main->name : "",
 451                     pvc->main && pvc->ether ? " " : "",
 452                     pvc->ether ? pvc->ether->name : "",
 453                     pvc->state.new ? " new" : "",
 454                     !pvc->state.exist ? "deleted" :
 455                     pvc->state.active ? "active" : "inactive");
 456 }
 457
 458
 459
 460 static inline u8 fr_lmi_nextseq(u8 x)
 461 {
 462         x++;
 463         return x ? x : 1;
 464 }
 465
 466
 467 static void fr_lmi_send(struct net_device *dev, int fullrep)
 468 {
 469         hdlc_device *hdlc = dev_to_hdlc(dev);
 470         struct sk_buff *skb;
 471         struct pvc_device *pvc = state(hdlc)->first_pvc;
 472         int lmi = state(hdlc)->settings.lmi;
 473         int dce = state(hdlc)->settings.dce;
 474         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 475         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 476         u8 *data;
 477         int i = 0;
 478
 479         if (dce && fullrep) {
 480                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 481                 if (len > HDLC_MAX_MRU) {
 482                         netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
 483                         return;
 484                 }
 485         }
 486
 487         skb = dev_alloc_skb(len);
 488         if (!skb) {
 489                 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
 490                 return;
 491         }
 492         memset(skb->data, 0, len);
 493         skb_reserve(skb, 4);
 494         if (lmi == LMI_CISCO) {
 495                 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
 496                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 497         } else {
 498                 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
 499                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 500         }
 501         data = skb_tail_pointer(skb);
 502         data[i++] = LMI_CALLREF;
 503         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 504         if (lmi == LMI_ANSI)
 505                 data[i++] = LMI_ANSI_LOCKSHIFT;
 506         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 507                 LMI_ANSI_CISCO_REPTYPE;
 508         data[i++] = LMI_REPT_LEN;
 509         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 510         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 511         data[i++] = LMI_INTEG_LEN;
 512         data[i++] = state(hdlc)->txseq =
 513                 fr_lmi_nextseq(state(hdlc)->txseq);
 514         data[i++] = state(hdlc)->rxseq;
 515
 516         if (dce && fullrep) {
 517                 while (pvc) {
 518                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 519                                 LMI_ANSI_CISCO_PVCSTAT;
 520                         data[i++] = stat_len;
 521
 522                         /* LMI start/restart */
 523                         if (state(hdlc)->reliable && !pvc->state.exist) {
 524                                 pvc->state.exist = pvc->state.new = 1;
 525                                 fr_log_dlci_active(pvc);
 526                         }
 527
 528                         /* ifconfig PVC up */
 529                         if (pvc->open_count && !pvc->state.active &&
 530                             pvc->state.exist && !pvc->state.new) {
 531                                 pvc_carrier(1, pvc);
 532                                 pvc->state.active = 1;
 533                                 fr_log_dlci_active(pvc);
 534                         }
 535
 536                         if (lmi == LMI_CISCO) {
 537                                 data[i] = pvc->dlci >> 8;
 538                                 data[i + 1] = pvc->dlci & 0xFF;
 539                         } else {
 540                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 541                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 542                                 data[i + 2] = 0x80;
 543                         }
 544
 545                         if (pvc->state.new)
 546                                 data[i + 2] |= 0x08;
 547                         else if (pvc->state.active)
 548                                 data[i + 2] |= 0x02;
 549
 550                         i += stat_len;
 551                         pvc = pvc->next;
 552                 }
 553         }
 554
 555         skb_put(skb, i);
 556         skb->priority = TC_PRIO_CONTROL;
 557         skb->dev = dev;
 558         skb_reset_network_header(skb);
 559
 560         dev_queue_xmit(skb);
 561 }
 562
 563
 564
 565 static void fr_set_link_state(int reliable, struct net_device *dev)
 566 {
 567         hdlc_device *hdlc = dev_to_hdlc(dev);
 568         struct pvc_device *pvc = state(hdlc)->first_pvc;
 569
 570         state(hdlc)->reliable = reliable;
 571         if (reliable) {
 572                 netif_dormant_off(dev);
 573                 state(hdlc)->n391cnt = 0; /* Request full status */
 574                 state(hdlc)->dce_changed = 1;
 575
 576                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 577                         while (pvc) {   /* Activate all PVCs */
 578                                 pvc_carrier(1, pvc);
 579                                 pvc->state.exist = pvc->state.active = 1;
 580                                 pvc->state.new = 0;
 581                                 pvc = pvc->next;
 582                         }
 583                 }
 584         } else {
 585                 netif_dormant_on(dev);
 586                 while (pvc) {           /* Deactivate all PVCs */
 587                         pvc_carrier(0, pvc);
 588                         pvc->state.exist = pvc->state.active = 0;
 589                         pvc->state.new = 0;
 590                         if (!state(hdlc)->settings.dce)
 591                                 pvc->state.bandwidth = 0;
 592                         pvc = pvc->next;
 593                 }
 594         }
 595 }
 596
 597
 598 static void fr_timer(struct timer_list *t)
 599 {
 600         struct frad_state *st = from_timer(st, t, timer);
 601         struct net_device *dev = st->dev;
 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         add_timer(&state(hdlc)->timer);
 647 }
 648
 649
 650 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 651 {
 652         hdlc_device *hdlc = dev_to_hdlc(dev);
 653         struct pvc_device *pvc;
 654         u8 rxseq, txseq;
 655         int lmi = state(hdlc)->settings.lmi;
 656         int dce = state(hdlc)->settings.dce;
 657         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 658
 659         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 660                         LMI_CCITT_CISCO_LENGTH)) {
 661                 netdev_info(dev, "Short LMI frame\n");
 662                 return 1;
 663         }
 664
 665         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 666                              NLPID_CCITT_ANSI_LMI)) {
 667                 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
 668                 return 1;
 669         }
 670
 671         if (skb->data[4] != LMI_CALLREF) {
 672                 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
 673                             skb->data[4]);
 674                 return 1;
 675         }
 676
 677         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 678                 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
 679                             skb->data[5]);
 680                 return 1;
 681         }
 682
 683         if (lmi == LMI_ANSI) {
 684                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 685                         netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
 686                                     skb->data[6]);
 687                         return 1;
 688                 }
 689                 i = 7;
 690         } else
 691                 i = 6;
 692
 693         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 694                              LMI_ANSI_CISCO_REPTYPE)) {
 695                 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
 696                             skb->data[i]);
 697                 return 1;
 698         }
 699
 700         if (skb->data[++i] != LMI_REPT_LEN) {
 701                 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
 702                             skb->data[i]);
 703                 return 1;
 704         }
 705
 706         reptype = skb->data[++i];
 707         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 708                 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
 709                             reptype);
 710                 return 1;
 711         }
 712
 713         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 714                                LMI_ANSI_CISCO_ALIVE)) {
 715                 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
 716                             skb->data[i]);
 717                 return 1;
 718         }
 719
 720         if (skb->data[++i] != LMI_INTEG_LEN) {
 721                 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
 722                             skb->data[i]);
 723                 return 1;
 724         }
 725         i++;
 726
 727         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 728         rxseq = skb->data[i++]; /* Should confirm our sequence */
 729
 730         txseq = state(hdlc)->txseq;
 731
 732         if (dce)
 733                 state(hdlc)->last_poll = jiffies;
 734
 735         error = 0;
 736         if (!state(hdlc)->reliable)
 737                 error = 1;
 738
 739         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 740                 state(hdlc)->n391cnt = 0;
 741                 error = 1;
 742         }
 743
 744         if (dce) {
 745                 if (state(hdlc)->fullrep_sent && !error) {
 746 /* Stop sending full report - the last one has been confirmed by DTE */
 747                         state(hdlc)->fullrep_sent = 0;
 748                         pvc = state(hdlc)->first_pvc;
 749                         while (pvc) {
 750                                 if (pvc->state.new) {
 751                                         pvc->state.new = 0;
 752
 753 /* Tell DTE that new PVC is now active */
 754                                         state(hdlc)->dce_changed = 1;
 755                                 }
 756                                 pvc = pvc->next;
 757                         }
 758                 }
 759
 760                 if (state(hdlc)->dce_changed) {
 761                         reptype = LMI_FULLREP;
 762                         state(hdlc)->fullrep_sent = 1;
 763                         state(hdlc)->dce_changed = 0;
 764                 }
 765
 766                 state(hdlc)->request = 1; /* got request */
 767                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 768                 return 0;
 769         }
 770
 771         /* DTE */
 772
 773         state(hdlc)->request = 0; /* got response, no request pending */
 774
 775         if (error)
 776                 return 0;
 777
 778         if (reptype != LMI_FULLREP)
 779                 return 0;
 780
 781         pvc = state(hdlc)->first_pvc;
 782
 783         while (pvc) {
 784                 pvc->state.deleted = 1;
 785                 pvc = pvc->next;
 786         }
 787
 788         no_ram = 0;
 789         while (skb->len >= i + 2 + stat_len) {
 790                 u16 dlci;
 791                 u32 bw;
 792                 unsigned int active, new;
 793
 794                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 795                                        LMI_ANSI_CISCO_PVCSTAT)) {
 796                         netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
 797                                     skb->data[i]);
 798                         return 1;
 799                 }
 800
 801                 if (skb->data[++i] != stat_len) {
 802                         netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
 803                                     skb->data[i]);
 804                         return 1;
 805                 }
 806                 i++;
 807
 808                 new = !! (skb->data[i + 2] & 0x08);
 809                 active = !! (skb->data[i + 2] & 0x02);
 810                 if (lmi == LMI_CISCO) {
 811                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 812                         bw = (skb->data[i + 3] << 16) |
 813                                 (skb->data[i + 4] << 8) |
 814                                 (skb->data[i + 5]);
 815                 } else {
 816                         dlci = ((skb->data[i] & 0x3F) << 4) |
 817                                 ((skb->data[i + 1] & 0x78) >> 3);
 818                         bw = 0;
 819                 }
 820
 821                 pvc = add_pvc(dev, dlci);
 822
 823                 if (!pvc && !no_ram) {
 824                         netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
 825                         no_ram = 1;
 826                 }
 827
 828                 if (pvc) {
 829                         pvc->state.exist = 1;
 830                         pvc->state.deleted = 0;
 831                         if (active != pvc->state.active ||
 832                             new != pvc->state.new ||
 833                             bw != pvc->state.bandwidth ||
 834                             !pvc->state.exist) {
 835                                 pvc->state.new = new;
 836                                 pvc->state.active = active;
 837                                 pvc->state.bandwidth = bw;
 838                                 pvc_carrier(active, pvc);
 839                                 fr_log_dlci_active(pvc);
 840                         }
 841                 }
 842
 843                 i += stat_len;
 844         }
 845
 846         pvc = state(hdlc)->first_pvc;
 847
 848         while (pvc) {
 849                 if (pvc->state.deleted && pvc->state.exist) {
 850                         pvc_carrier(0, pvc);
 851                         pvc->state.active = pvc->state.new = 0;
 852                         pvc->state.exist = 0;
 853                         pvc->state.bandwidth = 0;
 854                         fr_log_dlci_active(pvc);
 855                 }
 856                 pvc = pvc->next;
 857         }
 858
 859         /* Next full report after N391 polls */
 860         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 861
 862         return 0;
 863 }
 864
 865
 866 static int fr_rx(struct sk_buff *skb)
 867 {
 868         struct net_device *frad = skb->dev;
 869         hdlc_device *hdlc = dev_to_hdlc(frad);
 870         struct fr_hdr *fh = (struct fr_hdr *)skb->data;
 871         u8 *data = skb->data;
 872         u16 dlci;
 873         struct pvc_device *pvc;
 874         struct net_device *dev = NULL;
 875
 876         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 877                 goto rx_error;
 878
 879         dlci = q922_to_dlci(skb->data);
 880
 881         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 882              (state(hdlc)->settings.lmi == LMI_ANSI ||
 883               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 884             (dlci == LMI_CISCO_DLCI &&
 885              state(hdlc)->settings.lmi == LMI_CISCO)) {
 886                 if (fr_lmi_recv(frad, skb))
 887                         goto rx_error;
 888                 dev_kfree_skb_any(skb);
 889                 return NET_RX_SUCCESS;
 890         }
 891
 892         pvc = find_pvc(hdlc, dlci);
 893         if (!pvc) {
 894 #ifdef DEBUG_PKT
 895                 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
 896                             dlci);
 897 #endif
 898                 dev_kfree_skb_any(skb);
 899                 return NET_RX_DROP;
 900         }
 901
 902         if (pvc->state.fecn != fh->fecn) {
 903 #ifdef DEBUG_ECN
 904                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 905                        dlci, fh->fecn ? "N" : "FF");
 906 #endif
 907                 pvc->state.fecn ^= 1;
 908         }
 909
 910         if (pvc->state.becn != fh->becn) {
 911 #ifdef DEBUG_ECN
 912                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 913                        dlci, fh->becn ? "N" : "FF");
 914 #endif
 915                 pvc->state.becn ^= 1;
 916         }
 917
 918
 919         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 920                 frad->stats.rx_dropped++;
 921                 return NET_RX_DROP;
 922         }
 923
 924         if (data[3] == NLPID_IP) {
 925                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 926                 dev = pvc->main;
 927                 skb->protocol = htons(ETH_P_IP);
 928
 929         } else if (data[3] == NLPID_IPV6) {
 930                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 931                 dev = pvc->main;
 932                 skb->protocol = htons(ETH_P_IPV6);
 933
 934         } else if (skb->len > 10 && data[3] == FR_PAD &&
 935                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 936                 u16 oui = ntohs(*(__be16*)(data + 6));
 937                 u16 pid = ntohs(*(__be16*)(data + 8));
 938                 skb_pull(skb, 10);
 939
 940                 switch ((((u32)oui) << 16) | pid) {
 941                 case ETH_P_ARP: /* routed frame with SNAP */
 942                 case ETH_P_IPX:
 943                 case ETH_P_IP:  /* a long variant */
 944                 case ETH_P_IPV6:
 945                         dev = pvc->main;
 946                         skb->protocol = htons(pid);
 947                         break;
 948
 949                 case 0x80C20007: /* bridged Ethernet frame */
 950                         if ((dev = pvc->ether) != NULL)
 951                                 skb->protocol = eth_type_trans(skb, dev);
 952                         break;
 953
 954                 default:
 955                         netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
 956                                     oui, pid);
 957                         dev_kfree_skb_any(skb);
 958                         return NET_RX_DROP;
 959                 }
 960         } else {
 961                 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
 962                             data[3], skb->len);
 963                 dev_kfree_skb_any(skb);
 964                 return NET_RX_DROP;
 965         }
 966
 967         if (dev) {
 968                 dev->stats.rx_packets++; /* PVC traffic */
 969                 dev->stats.rx_bytes += skb->len;
 970                 if (pvc->state.becn)
 971                         dev->stats.rx_compressed++;
 972                 skb->dev = dev;
 973                 netif_rx(skb);
 974                 return NET_RX_SUCCESS;
 975         } else {
 976                 dev_kfree_skb_any(skb);
 977                 return NET_RX_DROP;
 978         }
 979
 980  rx_error:
 981         frad->stats.rx_errors++; /* Mark error */
 982         dev_kfree_skb_any(skb);
 983         return NET_RX_DROP;
 984 }
 985
 986
 987
 988 static void fr_start(struct net_device *dev)
 989 {
 990         hdlc_device *hdlc = dev_to_hdlc(dev);
 991 #ifdef DEBUG_LINK
 992         printk(KERN_DEBUG "fr_start\n");
 993 #endif
 994         if (state(hdlc)->settings.lmi != LMI_NONE) {
 995                 state(hdlc)->reliable = 0;
 996                 state(hdlc)->dce_changed = 1;
 997                 state(hdlc)->request = 0;
 998                 state(hdlc)->fullrep_sent = 0;
 999                 state(hdlc)->last_errors = 0xFFFFFFFF;
1000                 state(hdlc)->n391cnt = 0;
1001                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1002
1003                 state(hdlc)->dev = dev;
1004                 timer_setup(&state(hdlc)->timer, fr_timer, 0);
1005                 /* First poll after 1 s */
1006                 state(hdlc)->timer.expires = jiffies + HZ;
1007                 add_timer(&state(hdlc)->timer);
1008         } else
1009                 fr_set_link_state(1, dev);
1010 }
1011
1012
1013 static void fr_stop(struct net_device *dev)
1014 {
1015         hdlc_device *hdlc = dev_to_hdlc(dev);
1016 #ifdef DEBUG_LINK
1017         printk(KERN_DEBUG "fr_stop\n");
1018 #endif
1019         if (state(hdlc)->settings.lmi != LMI_NONE)
1020                 del_timer_sync(&state(hdlc)->timer);
1021         fr_set_link_state(0, dev);
1022 }
1023
1024
1025 static void fr_close(struct net_device *dev)
1026 {
1027         hdlc_device *hdlc = dev_to_hdlc(dev);
1028         struct pvc_device *pvc = state(hdlc)->first_pvc;
1029
1030         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1031                 if (pvc->main)
1032                         dev_close(pvc->main);
1033                 if (pvc->ether)
1034                         dev_close(pvc->ether);
1035                 pvc = pvc->next;
1036         }
1037 }
1038
1039
1040 static void pvc_setup(struct net_device *dev)
1041 {
1042         dev->type = ARPHRD_DLCI;
1043         dev->flags = IFF_POINTOPOINT;
1044         dev->hard_header_len = 10;
1045         dev->addr_len = 2;
1046         netif_keep_dst(dev);
1047 }
1048
1049 static const struct net_device_ops pvc_ops = {
1050         .ndo_open       = pvc_open,
1051         .ndo_stop       = pvc_close,
1052         .ndo_start_xmit = pvc_xmit,
1053         .ndo_do_ioctl   = pvc_ioctl,
1054 };
1055
1056 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1057 {
1058         hdlc_device *hdlc = dev_to_hdlc(frad);
1059         struct pvc_device *pvc;
1060         struct net_device *dev;
1061         int used;
1062
1063         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1064                 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1065                 return -ENOBUFS;
1066         }
1067
1068         if (*get_dev_p(pvc, type))
1069                 return -EEXIST;
1070
1071         used = pvc_is_used(pvc);
1072
1073         if (type == ARPHRD_ETHER)
1074                 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1075                                    ether_setup);
1076         else
1077                 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1078
1079         if (!dev) {
1080                 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1081                 delete_unused_pvcs(hdlc);
1082                 return -ENOBUFS;
1083         }
1084
1085         if (type == ARPHRD_ETHER) {
1086                 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1087                 eth_hw_addr_random(dev);
1088         } else {
1089                 *(__be16*)dev->dev_addr = htons(dlci);
1090                 dlci_to_q922(dev->broadcast, dlci);
1091         }
1092         dev->netdev_ops = &pvc_ops;
1093         dev->mtu = HDLC_MAX_MTU;
1094         dev->min_mtu = 68;
1095         dev->max_mtu = HDLC_MAX_MTU;
1096         dev->priv_flags |= IFF_NO_QUEUE;
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->needs_free_netdev = true;
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         struct 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         struct 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                 struct 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                 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1241                 return 0;
1242
1243         case IF_PROTO_FR_ADD_PVC:
1244         case IF_PROTO_FR_DEL_PVC:
1245         case IF_PROTO_FR_ADD_ETH_PVC:
1246         case IF_PROTO_FR_DEL_ETH_PVC:
1247                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1248                         return -EINVAL;
1249
1250                 if (!capable(CAP_NET_ADMIN))
1251                         return -EPERM;
1252
1253                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1254                                    sizeof(fr_proto_pvc)))
1255                         return -EFAULT;
1256
1257                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1258                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1259
1260                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1261                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1262                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1263                 else
1264                         result = ARPHRD_DLCI;
1265
1266                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1267                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1268                         return fr_add_pvc(dev, pvc.dlci, result);
1269                 else
1270                         return fr_del_pvc(hdlc, pvc.dlci, result);
1271         }
1272
1273         return -EINVAL;
1274 }
1275
1276
1277 static int __init mod_init(void)
1278 {
1279         register_hdlc_protocol(&proto);
1280         return 0;
1281 }
1282
1283
1284 static void __exit mod_exit(void)
1285 {
1286         unregister_hdlc_protocol(&proto);
1287 }
1288
1289
1290 module_init(mod_init);
1291 module_exit(mod_exit);
1292
1293 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1294 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1295 MODULE_LICENSE("GPL v2");