drivers/net/wan/hdlc_fr.c

   1 /*
   2  * Generic HDLC support routines for Linux
   3  * Frame Relay support
   4  *
   5  * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of version 2 of the GNU General Public License
   9  * as published by the Free Software Foundation.
  10  *
  11
  12             Theory of PVC state
  13
  14  DCE mode:
  15
  16  (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
  17          0,x -> 1,1 if "link reliable" when sending FULL STATUS
  18          1,1 -> 1,0 if received FULL STATUS ACK
  19
  20  (active)    -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
  21              -> 1 when "PVC up" and (exist,new) = 1,0
  22
  23  DTE mode:
  24  (exist,new,active) = FULL STATUS if "link reliable"
  25                     = 0, 0, 0 if "link unreliable"
  26  No LMI:
  27  active = open and "link reliable"
  28  exist = new = not used
  29
  30  CCITT LMI: ITU-T Q.933 Annex A
  31  ANSI LMI: ANSI T1.617 Annex D
  32  CISCO LMI: the original, aka "Gang of Four" LMI
  33
  34 */
  35
  36 #include <linux/errno.h>
  37 #include <linux/etherdevice.h>
  38 #include <linux/hdlc.h>
  39 #include <linux/if_arp.h>
  40 #include <linux/inetdevice.h>
  41 #include <linux/init.h>
  42 #include <linux/kernel.h>
  43 #include <linux/module.h>
  44 #include <linux/pkt_sched.h>
  45 #include <linux/poll.h>
  46 #include <linux/rtnetlink.h>
  47 #include <linux/skbuff.h>
  48 #include <linux/slab.h>
  49
  50 #undef DEBUG_PKT
  51 #undef DEBUG_ECN
  52 #undef DEBUG_LINK
  53 #undef DEBUG_PROTO
  54 #undef DEBUG_PVC
  55
  56 #define FR_UI                   0x03
  57 #define FR_PAD                  0x00
  58
  59 #define NLPID_IP                0xCC
  60 #define NLPID_IPV6              0x8E
  61 #define NLPID_SNAP              0x80
  62 #define NLPID_PAD               0x00
  63 #define NLPID_CCITT_ANSI_LMI    0x08
  64 #define NLPID_CISCO_LMI         0x09
  65
  66
  67 #define LMI_CCITT_ANSI_DLCI        0 /* LMI DLCI */
  68 #define LMI_CISCO_DLCI          1023
  69
  70 #define LMI_CALLREF             0x00 /* Call Reference */
  71 #define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI locking shift */
  72 #define LMI_ANSI_CISCO_REPTYPE  0x01 /* report type */
  73 #define LMI_CCITT_REPTYPE       0x51
  74 #define LMI_ANSI_CISCO_ALIVE    0x03 /* keep alive */
  75 #define LMI_CCITT_ALIVE         0x53
  76 #define LMI_ANSI_CISCO_PVCSTAT  0x07 /* PVC status */
  77 #define LMI_CCITT_PVCSTAT       0x57
  78
  79 #define LMI_FULLREP             0x00 /* full report  */
  80 #define LMI_INTEGRITY           0x01 /* link integrity report */
  81 #define LMI_SINGLE              0x02 /* single PVC report */
  82
  83 #define LMI_STATUS_ENQUIRY      0x75
  84 #define LMI_STATUS              0x7D /* reply */
  85
  86 #define LMI_REPT_LEN               1 /* report type element length */
  87 #define LMI_INTEG_LEN              2 /* link integrity element length */
  88
  89 #define LMI_CCITT_CISCO_LENGTH    13 /* LMI frame lengths */
  90 #define LMI_ANSI_LENGTH           14
  91
  92
  93 struct fr_hdr {
  94 #if defined(__LITTLE_ENDIAN_BITFIELD)
  95         unsigned ea1:   1;
  96         unsigned cr:    1;
  97         unsigned dlcih: 6;
  98
  99         unsigned ea2:   1;
 100         unsigned de:    1;
 101         unsigned becn:  1;
 102         unsigned fecn:  1;
 103         unsigned dlcil: 4;
 104 #else
 105         unsigned dlcih: 6;
 106         unsigned cr:    1;
 107         unsigned ea1:   1;
 108
 109         unsigned dlcil: 4;
 110         unsigned fecn:  1;
 111         unsigned becn:  1;
 112         unsigned de:    1;
 113         unsigned ea2:   1;
 114 #endif
 115 } __packed;
 116
 117
 118 struct pvc_device {
 119         struct net_device *frad;
 120         struct net_device *main;
 121         struct net_device *ether;       /* bridged Ethernet interface   */
 122         struct pvc_device *next;        /* Sorted in ascending DLCI order */
 123         int dlci;
 124         int open_count;
 125
 126         struct {
 127                 unsigned int new: 1;
 128                 unsigned int active: 1;
 129                 unsigned int exist: 1;
 130                 unsigned int deleted: 1;
 131                 unsigned int fecn: 1;
 132                 unsigned int becn: 1;
 133                 unsigned int bandwidth; /* Cisco LMI reporting only */
 134         }state;
 135 };
 136
 137 struct frad_state {
 138         fr_proto settings;
 139         struct pvc_device *first_pvc;
 140         int dce_pvc_count;
 141
 142         struct timer_list timer;
 143         struct net_device *dev;
 144         unsigned long last_poll;
 145         int reliable;
 146         int dce_changed;
 147         int request;
 148         int fullrep_sent;
 149         u32 last_errors; /* last errors bit list */
 150         u8 n391cnt;
 151         u8 txseq; /* TX sequence number */
 152         u8 rxseq; /* RX sequence number */
 153 };
 154
 155
 156 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 157
 158
 159 static inline u16 q922_to_dlci(u8 *hdr)
 160 {
 161         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 162 }
 163
 164
 165 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 166 {
 167         hdr[0] = (dlci >> 2) & 0xFC;
 168         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 169 }
 170
 171
 172 static inline struct frad_state* state(hdlc_device *hdlc)
 173 {
 174         return(struct frad_state *)(hdlc->state);
 175 }
 176
 177
 178 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
 179 {
 180         struct pvc_device *pvc = state(hdlc)->first_pvc;
 181
 182         while (pvc) {
 183                 if (pvc->dlci == dlci)
 184                         return pvc;
 185                 if (pvc->dlci > dlci)
 186                         return NULL; /* the list is sorted */
 187                 pvc = pvc->next;
 188         }
 189
 190         return NULL;
 191 }
 192
 193
 194 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
 195 {
 196         hdlc_device *hdlc = dev_to_hdlc(dev);
 197         struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 198
 199         while (*pvc_p) {
 200                 if ((*pvc_p)->dlci == dlci)
 201                         return *pvc_p;
 202                 if ((*pvc_p)->dlci > dlci)
 203                         break;  /* the list is sorted */
 204                 pvc_p = &(*pvc_p)->next;
 205         }
 206
 207         pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
 208 #ifdef DEBUG_PVC
 209         printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
 210 #endif
 211         if (!pvc)
 212                 return NULL;
 213
 214         pvc->dlci = dlci;
 215         pvc->frad = dev;
 216         pvc->next = *pvc_p;     /* Put it in the chain */
 217         *pvc_p = pvc;
 218         return pvc;
 219 }
 220
 221
 222 static inline int pvc_is_used(struct pvc_device *pvc)
 223 {
 224         return pvc->main || pvc->ether;
 225 }
 226
 227
 228 static inline void pvc_carrier(int on, struct pvc_device *pvc)
 229 {
 230         if (on) {
 231                 if (pvc->main)
 232                         if (!netif_carrier_ok(pvc->main))
 233                                 netif_carrier_on(pvc->main);
 234                 if (pvc->ether)
 235                         if (!netif_carrier_ok(pvc->ether))
 236                                 netif_carrier_on(pvc->ether);
 237         } else {
 238                 if (pvc->main)
 239                         if (netif_carrier_ok(pvc->main))
 240                                 netif_carrier_off(pvc->main);
 241                 if (pvc->ether)
 242                         if (netif_carrier_ok(pvc->ether))
 243                                 netif_carrier_off(pvc->ether);
 244         }
 245 }
 246
 247
 248 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 249 {
 250         struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
 251
 252         while (*pvc_p) {
 253                 if (!pvc_is_used(*pvc_p)) {
 254                         struct pvc_device *pvc = *pvc_p;
 255 #ifdef DEBUG_PVC
 256                         printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
 257 #endif
 258                         *pvc_p = pvc->next;
 259                         kfree(pvc);
 260                         continue;
 261                 }
 262                 pvc_p = &(*pvc_p)->next;
 263         }
 264 }
 265
 266
 267 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
 268                                             int type)
 269 {
 270         if (type == ARPHRD_ETHER)
 271                 return &pvc->ether;
 272         else
 273                 return &pvc->main;
 274 }
 275
 276
 277 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 278 {
 279         struct sk_buff *skb = *skb_p;
 280
 281         if (!skb->dev) { /* Control packets */
 282                 switch (dlci) {
 283                 case LMI_CCITT_ANSI_DLCI:
 284                         skb_push(skb, 4);
 285                         skb->data[3] = NLPID_CCITT_ANSI_LMI;
 286                         break;
 287
 288                 case LMI_CISCO_DLCI:
 289                         skb_push(skb, 4);
 290                         skb->data[3] = NLPID_CISCO_LMI;
 291                         break;
 292
 293                 default:
 294                         return -EINVAL;
 295                 }
 296
 297         } else if (skb->dev->type == ARPHRD_DLCI) {
 298                 switch (skb->protocol) {
 299                 case htons(ETH_P_IP):
 300                         skb_push(skb, 4);
 301                         skb->data[3] = NLPID_IP;
 302                         break;
 303
 304                 case htons(ETH_P_IPV6):
 305                         skb_push(skb, 4);
 306                         skb->data[3] = NLPID_IPV6;
 307                         break;
 308
 309                 default:
 310                         skb_push(skb, 10);
 311                         skb->data[3] = FR_PAD;
 312                         skb->data[4] = NLPID_SNAP;
 313                         /* OUI 00-00-00 indicates an Ethertype follows */
 314                         skb->data[5] = 0x00;
 315                         skb->data[6] = 0x00;
 316                         skb->data[7] = 0x00;
 317                         /* This should be an Ethertype: */
 318                         *(__be16 *)(skb->data + 8) = skb->protocol;
 319                 }
 320
 321         } else if (skb->dev->type == ARPHRD_ETHER) {
 322                 if (skb_headroom(skb) < 10) {
 323                         struct sk_buff *skb2 = skb_realloc_headroom(skb, 10);
 324                         if (!skb2)
 325                                 return -ENOBUFS;
 326                         dev_kfree_skb(skb);
 327                         skb = *skb_p = skb2;
 328                 }
 329                 skb_push(skb, 10);
 330                 skb->data[3] = FR_PAD;
 331                 skb->data[4] = NLPID_SNAP;
 332                 /* OUI 00-80-C2 stands for the 802.1 organization */
 333                 skb->data[5] = 0x00;
 334                 skb->data[6] = 0x80;
 335                 skb->data[7] = 0xC2;
 336                 /* PID 00-07 stands for Ethernet frames without FCS */
 337                 skb->data[8] = 0x00;
 338                 skb->data[9] = 0x07;
 339
 340         } else {
 341                 return -EINVAL;
 342         }
 343
 344         dlci_to_q922(skb->data, dlci);
 345         skb->data[2] = FR_UI;
 346         return 0;
 347 }
 348
 349
 350
 351 static int pvc_open(struct net_device *dev)
 352 {
 353         struct pvc_device *pvc = dev->ml_priv;
 354
 355         if ((pvc->frad->flags & IFF_UP) == 0)
 356                 return -EIO;  /* Frad must be UP in order to activate PVC */
 357
 358         if (pvc->open_count++ == 0) {
 359                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 360                 if (state(hdlc)->settings.lmi == LMI_NONE)
 361                         pvc->state.active = netif_carrier_ok(pvc->frad);
 362
 363                 pvc_carrier(pvc->state.active, pvc);
 364                 state(hdlc)->dce_changed = 1;
 365         }
 366         return 0;
 367 }
 368
 369
 370
 371 static int pvc_close(struct net_device *dev)
 372 {
 373         struct pvc_device *pvc = dev->ml_priv;
 374
 375         if (--pvc->open_count == 0) {
 376                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 377                 if (state(hdlc)->settings.lmi == LMI_NONE)
 378                         pvc->state.active = 0;
 379
 380                 if (state(hdlc)->settings.dce) {
 381                         state(hdlc)->dce_changed = 1;
 382                         pvc->state.active = 0;
 383                 }
 384         }
 385         return 0;
 386 }
 387
 388
 389
 390 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 391 {
 392         struct pvc_device *pvc = dev->ml_priv;
 393         fr_proto_pvc_info info;
 394
 395         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 396                 if (dev->type == ARPHRD_ETHER)
 397                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 398                 else
 399                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 400
 401                 if (ifr->ifr_settings.size < sizeof(info)) {
 402                         /* data size wanted */
 403                         ifr->ifr_settings.size = sizeof(info);
 404                         return -ENOBUFS;
 405                 }
 406
 407                 info.dlci = pvc->dlci;
 408                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 409                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 410                                  &info, sizeof(info)))
 411                         return -EFAULT;
 412                 return 0;
 413         }
 414
 415         return -EINVAL;
 416 }
 417
 418 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 419 {
 420         struct pvc_device *pvc = dev->ml_priv;
 421
 422         if (pvc->state.active) {
 423                 if (dev->type == ARPHRD_ETHER) {
 424                         int pad = ETH_ZLEN - skb->len;
 425                         if (pad > 0) { /* Pad the frame with zeros */
 426                                 int len = skb->len;
 427                                 if (skb_tailroom(skb) < pad)
 428                                         if (pskb_expand_head(skb, 0, pad,
 429                                                              GFP_ATOMIC)) {
 430                                                 dev->stats.tx_dropped++;
 431                                                 dev_kfree_skb(skb);
 432                                                 return NETDEV_TX_OK;
 433                                         }
 434                                 skb_put(skb, pad);
 435                                 memset(skb->data + len, 0, pad);
 436                         }
 437                 }
 438                 skb->dev = dev;
 439                 if (!fr_hard_header(&skb, pvc->dlci)) {
 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         }
 451
 452         dev->stats.tx_dropped++;
 453         dev_kfree_skb(skb);
 454         return NETDEV_TX_OK;
 455 }
 456
 457 static inline void fr_log_dlci_active(struct pvc_device *pvc)
 458 {
 459         netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
 460                     pvc->dlci,
 461                     pvc->main ? pvc->main->name : "",
 462                     pvc->main && pvc->ether ? " " : "",
 463                     pvc->ether ? pvc->ether->name : "",
 464                     pvc->state.new ? " new" : "",
 465                     !pvc->state.exist ? "deleted" :
 466                     pvc->state.active ? "active" : "inactive");
 467 }
 468
 469
 470
 471 static inline u8 fr_lmi_nextseq(u8 x)
 472 {
 473         x++;
 474         return x ? x : 1;
 475 }
 476
 477
 478 static void fr_lmi_send(struct net_device *dev, int fullrep)
 479 {
 480         hdlc_device *hdlc = dev_to_hdlc(dev);
 481         struct sk_buff *skb;
 482         struct pvc_device *pvc = state(hdlc)->first_pvc;
 483         int lmi = state(hdlc)->settings.lmi;
 484         int dce = state(hdlc)->settings.dce;
 485         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 486         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 487         u8 *data;
 488         int i = 0;
 489
 490         if (dce && fullrep) {
 491                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 492                 if (len > HDLC_MAX_MRU) {
 493                         netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
 494                         return;
 495                 }
 496         }
 497
 498         skb = dev_alloc_skb(len);
 499         if (!skb) {
 500                 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
 501                 return;
 502         }
 503         memset(skb->data, 0, len);
 504         skb_reserve(skb, 4);
 505         if (lmi == LMI_CISCO) {
 506                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 507         } else {
 508                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 509         }
 510         data = skb_tail_pointer(skb);
 511         data[i++] = LMI_CALLREF;
 512         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 513         if (lmi == LMI_ANSI)
 514                 data[i++] = LMI_ANSI_LOCKSHIFT;
 515         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 516                 LMI_ANSI_CISCO_REPTYPE;
 517         data[i++] = LMI_REPT_LEN;
 518         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 519         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 520         data[i++] = LMI_INTEG_LEN;
 521         data[i++] = state(hdlc)->txseq =
 522                 fr_lmi_nextseq(state(hdlc)->txseq);
 523         data[i++] = state(hdlc)->rxseq;
 524
 525         if (dce && fullrep) {
 526                 while (pvc) {
 527                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 528                                 LMI_ANSI_CISCO_PVCSTAT;
 529                         data[i++] = stat_len;
 530
 531                         /* LMI start/restart */
 532                         if (state(hdlc)->reliable && !pvc->state.exist) {
 533                                 pvc->state.exist = pvc->state.new = 1;
 534                                 fr_log_dlci_active(pvc);
 535                         }
 536
 537                         /* ifconfig PVC up */
 538                         if (pvc->open_count && !pvc->state.active &&
 539                             pvc->state.exist && !pvc->state.new) {
 540                                 pvc_carrier(1, pvc);
 541                                 pvc->state.active = 1;
 542                                 fr_log_dlci_active(pvc);
 543                         }
 544
 545                         if (lmi == LMI_CISCO) {
 546                                 data[i] = pvc->dlci >> 8;
 547                                 data[i + 1] = pvc->dlci & 0xFF;
 548                         } else {
 549                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 550                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 551                                 data[i + 2] = 0x80;
 552                         }
 553
 554                         if (pvc->state.new)
 555                                 data[i + 2] |= 0x08;
 556                         else if (pvc->state.active)
 557                                 data[i + 2] |= 0x02;
 558
 559                         i += stat_len;
 560                         pvc = pvc->next;
 561                 }
 562         }
 563
 564         skb_put(skb, i);
 565         skb->priority = TC_PRIO_CONTROL;
 566         skb->dev = dev;
 567         skb->protocol = htons(ETH_P_HDLC);
 568         skb_reset_network_header(skb);
 569
 570         dev_queue_xmit(skb);
 571 }
 572
 573
 574
 575 static void fr_set_link_state(int reliable, struct net_device *dev)
 576 {
 577         hdlc_device *hdlc = dev_to_hdlc(dev);
 578         struct pvc_device *pvc = state(hdlc)->first_pvc;
 579
 580         state(hdlc)->reliable = reliable;
 581         if (reliable) {
 582                 netif_dormant_off(dev);
 583                 state(hdlc)->n391cnt = 0; /* Request full status */
 584                 state(hdlc)->dce_changed = 1;
 585
 586                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 587                         while (pvc) {   /* Activate all PVCs */
 588                                 pvc_carrier(1, pvc);
 589                                 pvc->state.exist = pvc->state.active = 1;
 590                                 pvc->state.new = 0;
 591                                 pvc = pvc->next;
 592                         }
 593                 }
 594         } else {
 595                 netif_dormant_on(dev);
 596                 while (pvc) {           /* Deactivate all PVCs */
 597                         pvc_carrier(0, pvc);
 598                         pvc->state.exist = pvc->state.active = 0;
 599                         pvc->state.new = 0;
 600                         if (!state(hdlc)->settings.dce)
 601                                 pvc->state.bandwidth = 0;
 602                         pvc = pvc->next;
 603                 }
 604         }
 605 }
 606
 607
 608 static void fr_timer(struct timer_list *t)
 609 {
 610         struct frad_state *st = from_timer(st, t, timer);
 611         struct net_device *dev = st->dev;
 612         hdlc_device *hdlc = dev_to_hdlc(dev);
 613         int i, cnt = 0, reliable;
 614         u32 list;
 615
 616         if (state(hdlc)->settings.dce) {
 617                 reliable = state(hdlc)->request &&
 618                         time_before(jiffies, state(hdlc)->last_poll +
 619                                     state(hdlc)->settings.t392 * HZ);
 620                 state(hdlc)->request = 0;
 621         } else {
 622                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 623                 if (state(hdlc)->request) {
 624                         if (state(hdlc)->reliable)
 625                                 netdev_info(dev, "No LMI status reply received\n");
 626                         state(hdlc)->last_errors |= 1;
 627                 }
 628
 629                 list = state(hdlc)->last_errors;
 630                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 631                         cnt += (list & 1);      /* errors count */
 632
 633                 reliable = (cnt < state(hdlc)->settings.n392);
 634         }
 635
 636         if (state(hdlc)->reliable != reliable) {
 637                 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
 638                 fr_set_link_state(reliable, dev);
 639         }
 640
 641         if (state(hdlc)->settings.dce)
 642                 state(hdlc)->timer.expires = jiffies +
 643                         state(hdlc)->settings.t392 * HZ;
 644         else {
 645                 if (state(hdlc)->n391cnt)
 646                         state(hdlc)->n391cnt--;
 647
 648                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 649
 650                 state(hdlc)->last_poll = jiffies;
 651                 state(hdlc)->request = 1;
 652                 state(hdlc)->timer.expires = jiffies +
 653                         state(hdlc)->settings.t391 * HZ;
 654         }
 655
 656         add_timer(&state(hdlc)->timer);
 657 }
 658
 659
 660 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 661 {
 662         hdlc_device *hdlc = dev_to_hdlc(dev);
 663         struct pvc_device *pvc;
 664         u8 rxseq, txseq;
 665         int lmi = state(hdlc)->settings.lmi;
 666         int dce = state(hdlc)->settings.dce;
 667         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 668
 669         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 670                         LMI_CCITT_CISCO_LENGTH)) {
 671                 netdev_info(dev, "Short LMI frame\n");
 672                 return 1;
 673         }
 674
 675         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 676                              NLPID_CCITT_ANSI_LMI)) {
 677                 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
 678                 return 1;
 679         }
 680
 681         if (skb->data[4] != LMI_CALLREF) {
 682                 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
 683                             skb->data[4]);
 684                 return 1;
 685         }
 686
 687         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 688                 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
 689                             skb->data[5]);
 690                 return 1;
 691         }
 692
 693         if (lmi == LMI_ANSI) {
 694                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 695                         netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
 696                                     skb->data[6]);
 697                         return 1;
 698                 }
 699                 i = 7;
 700         } else
 701                 i = 6;
 702
 703         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 704                              LMI_ANSI_CISCO_REPTYPE)) {
 705                 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
 706                             skb->data[i]);
 707                 return 1;
 708         }
 709
 710         if (skb->data[++i] != LMI_REPT_LEN) {
 711                 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
 712                             skb->data[i]);
 713                 return 1;
 714         }
 715
 716         reptype = skb->data[++i];
 717         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 718                 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
 719                             reptype);
 720                 return 1;
 721         }
 722
 723         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 724                                LMI_ANSI_CISCO_ALIVE)) {
 725                 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
 726                             skb->data[i]);
 727                 return 1;
 728         }
 729
 730         if (skb->data[++i] != LMI_INTEG_LEN) {
 731                 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
 732                             skb->data[i]);
 733                 return 1;
 734         }
 735         i++;
 736
 737         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 738         rxseq = skb->data[i++]; /* Should confirm our sequence */
 739
 740         txseq = state(hdlc)->txseq;
 741
 742         if (dce)
 743                 state(hdlc)->last_poll = jiffies;
 744
 745         error = 0;
 746         if (!state(hdlc)->reliable)
 747                 error = 1;
 748
 749         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 750                 state(hdlc)->n391cnt = 0;
 751                 error = 1;
 752         }
 753
 754         if (dce) {
 755                 if (state(hdlc)->fullrep_sent && !error) {
 756 /* Stop sending full report - the last one has been confirmed by DTE */
 757                         state(hdlc)->fullrep_sent = 0;
 758                         pvc = state(hdlc)->first_pvc;
 759                         while (pvc) {
 760                                 if (pvc->state.new) {
 761                                         pvc->state.new = 0;
 762
 763 /* Tell DTE that new PVC is now active */
 764                                         state(hdlc)->dce_changed = 1;
 765                                 }
 766                                 pvc = pvc->next;
 767                         }
 768                 }
 769
 770                 if (state(hdlc)->dce_changed) {
 771                         reptype = LMI_FULLREP;
 772                         state(hdlc)->fullrep_sent = 1;
 773                         state(hdlc)->dce_changed = 0;
 774                 }
 775
 776                 state(hdlc)->request = 1; /* got request */
 777                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 778                 return 0;
 779         }
 780
 781         /* DTE */
 782
 783         state(hdlc)->request = 0; /* got response, no request pending */
 784
 785         if (error)
 786                 return 0;
 787
 788         if (reptype != LMI_FULLREP)
 789                 return 0;
 790
 791         pvc = state(hdlc)->first_pvc;
 792
 793         while (pvc) {
 794                 pvc->state.deleted = 1;
 795                 pvc = pvc->next;
 796         }
 797
 798         no_ram = 0;
 799         while (skb->len >= i + 2 + stat_len) {
 800                 u16 dlci;
 801                 u32 bw;
 802                 unsigned int active, new;
 803
 804                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 805                                        LMI_ANSI_CISCO_PVCSTAT)) {
 806                         netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
 807                                     skb->data[i]);
 808                         return 1;
 809                 }
 810
 811                 if (skb->data[++i] != stat_len) {
 812                         netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
 813                                     skb->data[i]);
 814                         return 1;
 815                 }
 816                 i++;
 817
 818                 new = !! (skb->data[i + 2] & 0x08);
 819                 active = !! (skb->data[i + 2] & 0x02);
 820                 if (lmi == LMI_CISCO) {
 821                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 822                         bw = (skb->data[i + 3] << 16) |
 823                                 (skb->data[i + 4] << 8) |
 824                                 (skb->data[i + 5]);
 825                 } else {
 826                         dlci = ((skb->data[i] & 0x3F) << 4) |
 827                                 ((skb->data[i + 1] & 0x78) >> 3);
 828                         bw = 0;
 829                 }
 830
 831                 pvc = add_pvc(dev, dlci);
 832
 833                 if (!pvc && !no_ram) {
 834                         netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
 835                         no_ram = 1;
 836                 }
 837
 838                 if (pvc) {
 839                         pvc->state.exist = 1;
 840                         pvc->state.deleted = 0;
 841                         if (active != pvc->state.active ||
 842                             new != pvc->state.new ||
 843                             bw != pvc->state.bandwidth ||
 844                             !pvc->state.exist) {
 845                                 pvc->state.new = new;
 846                                 pvc->state.active = active;
 847                                 pvc->state.bandwidth = bw;
 848                                 pvc_carrier(active, pvc);
 849                                 fr_log_dlci_active(pvc);
 850                         }
 851                 }
 852
 853                 i += stat_len;
 854         }
 855
 856         pvc = state(hdlc)->first_pvc;
 857
 858         while (pvc) {
 859                 if (pvc->state.deleted && pvc->state.exist) {
 860                         pvc_carrier(0, pvc);
 861                         pvc->state.active = pvc->state.new = 0;
 862                         pvc->state.exist = 0;
 863                         pvc->state.bandwidth = 0;
 864                         fr_log_dlci_active(pvc);
 865                 }
 866                 pvc = pvc->next;
 867         }
 868
 869         /* Next full report after N391 polls */
 870         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 871
 872         return 0;
 873 }
 874
 875
 876 static int fr_rx(struct sk_buff *skb)
 877 {
 878         struct net_device *frad = skb->dev;
 879         hdlc_device *hdlc = dev_to_hdlc(frad);
 880         struct fr_hdr *fh = (struct fr_hdr *)skb->data;
 881         u8 *data = skb->data;
 882         u16 dlci;
 883         struct pvc_device *pvc;
 884         struct net_device *dev = NULL;
 885
 886         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 887                 goto rx_error;
 888
 889         dlci = q922_to_dlci(skb->data);
 890
 891         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 892              (state(hdlc)->settings.lmi == LMI_ANSI ||
 893               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 894             (dlci == LMI_CISCO_DLCI &&
 895              state(hdlc)->settings.lmi == LMI_CISCO)) {
 896                 if (fr_lmi_recv(frad, skb))
 897                         goto rx_error;
 898                 dev_kfree_skb_any(skb);
 899                 return NET_RX_SUCCESS;
 900         }
 901
 902         pvc = find_pvc(hdlc, dlci);
 903         if (!pvc) {
 904 #ifdef DEBUG_PKT
 905                 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
 906                             dlci);
 907 #endif
 908                 dev_kfree_skb_any(skb);
 909                 return NET_RX_DROP;
 910         }
 911
 912         if (pvc->state.fecn != fh->fecn) {
 913 #ifdef DEBUG_ECN
 914                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 915                        dlci, fh->fecn ? "N" : "FF");
 916 #endif
 917                 pvc->state.fecn ^= 1;
 918         }
 919
 920         if (pvc->state.becn != fh->becn) {
 921 #ifdef DEBUG_ECN
 922                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 923                        dlci, fh->becn ? "N" : "FF");
 924 #endif
 925                 pvc->state.becn ^= 1;
 926         }
 927
 928
 929         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 930                 frad->stats.rx_dropped++;
 931                 return NET_RX_DROP;
 932         }
 933
 934         if (data[3] == NLPID_IP) {
 935                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 936                 dev = pvc->main;
 937                 skb->protocol = htons(ETH_P_IP);
 938
 939         } else if (data[3] == NLPID_IPV6) {
 940                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 941                 dev = pvc->main;
 942                 skb->protocol = htons(ETH_P_IPV6);
 943
 944         } else if (skb->len > 10 && data[3] == FR_PAD &&
 945                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 946                 u16 oui = ntohs(*(__be16*)(data + 6));
 947                 u16 pid = ntohs(*(__be16*)(data + 8));
 948                 skb_pull(skb, 10);
 949
 950                 switch ((((u32)oui) << 16) | pid) {
 951                 case ETH_P_ARP: /* routed frame with SNAP */
 952                 case ETH_P_IPX:
 953                 case ETH_P_IP:  /* a long variant */
 954                 case ETH_P_IPV6:
 955                         dev = pvc->main;
 956                         skb->protocol = htons(pid);
 957                         break;
 958
 959                 case 0x80C20007: /* bridged Ethernet frame */
 960                         if ((dev = pvc->ether) != NULL)
 961                                 skb->protocol = eth_type_trans(skb, dev);
 962                         break;
 963
 964                 default:
 965                         netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
 966                                     oui, pid);
 967                         dev_kfree_skb_any(skb);
 968                         return NET_RX_DROP;
 969                 }
 970         } else {
 971                 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
 972                             data[3], skb->len);
 973                 dev_kfree_skb_any(skb);
 974                 return NET_RX_DROP;
 975         }
 976
 977         if (dev) {
 978                 dev->stats.rx_packets++; /* PVC traffic */
 979                 dev->stats.rx_bytes += skb->len;
 980                 if (pvc->state.becn)
 981                         dev->stats.rx_compressed++;
 982                 skb->dev = dev;
 983                 netif_rx(skb);
 984                 return NET_RX_SUCCESS;
 985         } else {
 986                 dev_kfree_skb_any(skb);
 987                 return NET_RX_DROP;
 988         }
 989
 990  rx_error:
 991         frad->stats.rx_errors++; /* Mark error */
 992         dev_kfree_skb_any(skb);
 993         return NET_RX_DROP;
 994 }
 995
 996
 997
 998 static void fr_start(struct net_device *dev)
 999 {
1000         hdlc_device *hdlc = dev_to_hdlc(dev);
1001 #ifdef DEBUG_LINK
1002         printk(KERN_DEBUG "fr_start\n");
1003 #endif
1004         if (state(hdlc)->settings.lmi != LMI_NONE) {
1005                 state(hdlc)->reliable = 0;
1006                 state(hdlc)->dce_changed = 1;
1007                 state(hdlc)->request = 0;
1008                 state(hdlc)->fullrep_sent = 0;
1009                 state(hdlc)->last_errors = 0xFFFFFFFF;
1010                 state(hdlc)->n391cnt = 0;
1011                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1012
1013                 state(hdlc)->dev = dev;
1014                 timer_setup(&state(hdlc)->timer, fr_timer, 0);
1015                 /* First poll after 1 s */
1016                 state(hdlc)->timer.expires = jiffies + HZ;
1017                 add_timer(&state(hdlc)->timer);
1018         } else
1019                 fr_set_link_state(1, dev);
1020 }
1021
1022
1023 static void fr_stop(struct net_device *dev)
1024 {
1025         hdlc_device *hdlc = dev_to_hdlc(dev);
1026 #ifdef DEBUG_LINK
1027         printk(KERN_DEBUG "fr_stop\n");
1028 #endif
1029         if (state(hdlc)->settings.lmi != LMI_NONE)
1030                 del_timer_sync(&state(hdlc)->timer);
1031         fr_set_link_state(0, dev);
1032 }
1033
1034
1035 static void fr_close(struct net_device *dev)
1036 {
1037         hdlc_device *hdlc = dev_to_hdlc(dev);
1038         struct pvc_device *pvc = state(hdlc)->first_pvc;
1039
1040         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1041                 if (pvc->main)
1042                         dev_close(pvc->main);
1043                 if (pvc->ether)
1044                         dev_close(pvc->ether);
1045                 pvc = pvc->next;
1046         }
1047 }
1048
1049
1050 static void pvc_setup(struct net_device *dev)
1051 {
1052         dev->type = ARPHRD_DLCI;
1053         dev->flags = IFF_POINTOPOINT;
1054         dev->hard_header_len = 0;
1055         dev->addr_len = 2;
1056         netif_keep_dst(dev);
1057 }
1058
1059 static const struct net_device_ops pvc_ops = {
1060         .ndo_open       = pvc_open,
1061         .ndo_stop       = pvc_close,
1062         .ndo_start_xmit = pvc_xmit,
1063         .ndo_do_ioctl   = pvc_ioctl,
1064 };
1065
1066 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1067 {
1068         hdlc_device *hdlc = dev_to_hdlc(frad);
1069         struct pvc_device *pvc;
1070         struct net_device *dev;
1071         int used;
1072
1073         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1074                 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1075                 return -ENOBUFS;
1076         }
1077
1078         if (*get_dev_p(pvc, type))
1079                 return -EEXIST;
1080
1081         used = pvc_is_used(pvc);
1082
1083         if (type == ARPHRD_ETHER)
1084                 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1085                                    ether_setup);
1086         else
1087                 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1088
1089         if (!dev) {
1090                 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1091                 delete_unused_pvcs(hdlc);
1092                 return -ENOBUFS;
1093         }
1094
1095         if (type == ARPHRD_ETHER) {
1096                 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1097                 eth_hw_addr_random(dev);
1098         } else {
1099                 *(__be16*)dev->dev_addr = htons(dlci);
1100                 dlci_to_q922(dev->broadcast, dlci);
1101         }
1102         dev->netdev_ops = &pvc_ops;
1103         dev->mtu = HDLC_MAX_MTU;
1104         dev->min_mtu = 68;
1105         dev->max_mtu = HDLC_MAX_MTU;
1106         dev->needed_headroom = 10;
1107         dev->priv_flags |= IFF_NO_QUEUE;
1108         dev->ml_priv = pvc;
1109
1110         if (register_netdevice(dev) != 0) {
1111                 free_netdev(dev);
1112                 delete_unused_pvcs(hdlc);
1113                 return -EIO;
1114         }
1115
1116         dev->needs_free_netdev = true;
1117         *get_dev_p(pvc, type) = dev;
1118         if (!used) {
1119                 state(hdlc)->dce_changed = 1;
1120                 state(hdlc)->dce_pvc_count++;
1121         }
1122         return 0;
1123 }
1124
1125
1126
1127 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1128 {
1129         struct pvc_device *pvc;
1130         struct net_device *dev;
1131
1132         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1133                 return -ENOENT;
1134
1135         if ((dev = *get_dev_p(pvc, type)) == NULL)
1136                 return -ENOENT;
1137
1138         if (dev->flags & IFF_UP)
1139                 return -EBUSY;          /* PVC in use */
1140
1141         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1142         *get_dev_p(pvc, type) = NULL;
1143
1144         if (!pvc_is_used(pvc)) {
1145                 state(hdlc)->dce_pvc_count--;
1146                 state(hdlc)->dce_changed = 1;
1147         }
1148         delete_unused_pvcs(hdlc);
1149         return 0;
1150 }
1151
1152
1153
1154 static void fr_destroy(struct net_device *frad)
1155 {
1156         hdlc_device *hdlc = dev_to_hdlc(frad);
1157         struct pvc_device *pvc = state(hdlc)->first_pvc;
1158         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1159         state(hdlc)->dce_pvc_count = 0;
1160         state(hdlc)->dce_changed = 1;
1161
1162         while (pvc) {
1163                 struct pvc_device *next = pvc->next;
1164                 /* destructors will free_netdev() main and ether */
1165                 if (pvc->main)
1166                         unregister_netdevice(pvc->main);
1167
1168                 if (pvc->ether)
1169                         unregister_netdevice(pvc->ether);
1170
1171                 kfree(pvc);
1172                 pvc = next;
1173         }
1174 }
1175
1176
1177 static struct hdlc_proto proto = {
1178         .close          = fr_close,
1179         .start          = fr_start,
1180         .stop           = fr_stop,
1181         .detach         = fr_destroy,
1182         .ioctl          = fr_ioctl,
1183         .netif_rx       = fr_rx,
1184         .module         = THIS_MODULE,
1185 };
1186
1187
1188 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1189 {
1190         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1191         const size_t size = sizeof(fr_proto);
1192         fr_proto new_settings;
1193         hdlc_device *hdlc = dev_to_hdlc(dev);
1194         fr_proto_pvc pvc;
1195         int result;
1196
1197         switch (ifr->ifr_settings.type) {
1198         case IF_GET_PROTO:
1199                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1200                         return -EINVAL;
1201                 ifr->ifr_settings.type = IF_PROTO_FR;
1202                 if (ifr->ifr_settings.size < size) {
1203                         ifr->ifr_settings.size = size; /* data size wanted */
1204                         return -ENOBUFS;
1205                 }
1206                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1207                         return -EFAULT;
1208                 return 0;
1209
1210         case IF_PROTO_FR:
1211                 if (!capable(CAP_NET_ADMIN))
1212                         return -EPERM;
1213
1214                 if (dev->flags & IFF_UP)
1215                         return -EBUSY;
1216
1217                 if (copy_from_user(&new_settings, fr_s, size))
1218                         return -EFAULT;
1219
1220                 if (new_settings.lmi == LMI_DEFAULT)
1221                         new_settings.lmi = LMI_ANSI;
1222
1223                 if ((new_settings.lmi != LMI_NONE &&
1224                      new_settings.lmi != LMI_ANSI &&
1225                      new_settings.lmi != LMI_CCITT &&
1226                      new_settings.lmi != LMI_CISCO) ||
1227                     new_settings.t391 < 1 ||
1228                     new_settings.t392 < 2 ||
1229                     new_settings.n391 < 1 ||
1230                     new_settings.n392 < 1 ||
1231                     new_settings.n393 < new_settings.n392 ||
1232                     new_settings.n393 > 32 ||
1233                     (new_settings.dce != 0 &&
1234                      new_settings.dce != 1))
1235                         return -EINVAL;
1236
1237                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1238                 if (result)
1239                         return result;
1240
1241                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1242                         result = attach_hdlc_protocol(dev, &proto,
1243                                                       sizeof(struct frad_state));
1244                         if (result)
1245                                 return result;
1246                         state(hdlc)->first_pvc = NULL;
1247                         state(hdlc)->dce_pvc_count = 0;
1248                 }
1249                 memcpy(&state(hdlc)->settings, &new_settings, size);
1250                 dev->type = ARPHRD_FRAD;
1251                 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1252                 return 0;
1253
1254         case IF_PROTO_FR_ADD_PVC:
1255         case IF_PROTO_FR_DEL_PVC:
1256         case IF_PROTO_FR_ADD_ETH_PVC:
1257         case IF_PROTO_FR_DEL_ETH_PVC:
1258                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1259                         return -EINVAL;
1260
1261                 if (!capable(CAP_NET_ADMIN))
1262                         return -EPERM;
1263
1264                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1265                                    sizeof(fr_proto_pvc)))
1266                         return -EFAULT;
1267
1268                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1269                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1270
1271                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1272                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1273                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1274                 else
1275                         result = ARPHRD_DLCI;
1276
1277                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1278                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1279                         return fr_add_pvc(dev, pvc.dlci, result);
1280                 else
1281                         return fr_del_pvc(hdlc, pvc.dlci, result);
1282         }
1283
1284         return -EINVAL;
1285 }
1286
1287
1288 static int __init mod_init(void)
1289 {
1290         register_hdlc_protocol(&proto);
1291         return 0;
1292 }
1293
1294
1295 static void __exit mod_exit(void)
1296 {
1297         unregister_hdlc_protocol(&proto);
1298 }
1299
1300
1301 module_init(mod_init);
1302 module_exit(mod_exit);
1303
1304 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1305 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1306 MODULE_LICENSE("GPL v2");