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         unsigned long last_poll;
 144         int reliable;
 145         int dce_changed;
 146         int request;
 147         int fullrep_sent;
 148         u32 last_errors; /* last errors bit list */
 149         u8 n391cnt;
 150         u8 txseq; /* TX sequence number */
 151         u8 rxseq; /* RX sequence number */
 152 };
 153
 154
 155 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 156
 157
 158 static inline u16 q922_to_dlci(u8 *hdr)
 159 {
 160         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 161 }
 162
 163
 164 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 165 {
 166         hdr[0] = (dlci >> 2) & 0xFC;
 167         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 168 }
 169
 170
 171 static inline struct frad_state* state(hdlc_device *hdlc)
 172 {
 173         return(struct frad_state *)(hdlc->state);
 174 }
 175
 176
 177 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
 178 {
 179         struct pvc_device *pvc = state(hdlc)->first_pvc;
 180
 181         while (pvc) {
 182                 if (pvc->dlci == dlci)
 183                         return pvc;
 184                 if (pvc->dlci > dlci)
 185                         return NULL; /* the list is sorted */
 186                 pvc = pvc->next;
 187         }
 188
 189         return NULL;
 190 }
 191
 192
 193 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
 194 {
 195         hdlc_device *hdlc = dev_to_hdlc(dev);
 196         struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 197
 198         while (*pvc_p) {
 199                 if ((*pvc_p)->dlci == dlci)
 200                         return *pvc_p;
 201                 if ((*pvc_p)->dlci > dlci)
 202                         break;  /* the list is sorted */
 203                 pvc_p = &(*pvc_p)->next;
 204         }
 205
 206         pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
 207 #ifdef DEBUG_PVC
 208         printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
 209 #endif
 210         if (!pvc)
 211                 return NULL;
 212
 213         pvc->dlci = dlci;
 214         pvc->frad = dev;
 215         pvc->next = *pvc_p;     /* Put it in the chain */
 216         *pvc_p = pvc;
 217         return pvc;
 218 }
 219
 220
 221 static inline int pvc_is_used(struct pvc_device *pvc)
 222 {
 223         return pvc->main || pvc->ether;
 224 }
 225
 226
 227 static inline void pvc_carrier(int on, struct pvc_device *pvc)
 228 {
 229         if (on) {
 230                 if (pvc->main)
 231                         if (!netif_carrier_ok(pvc->main))
 232                                 netif_carrier_on(pvc->main);
 233                 if (pvc->ether)
 234                         if (!netif_carrier_ok(pvc->ether))
 235                                 netif_carrier_on(pvc->ether);
 236         } else {
 237                 if (pvc->main)
 238                         if (netif_carrier_ok(pvc->main))
 239                                 netif_carrier_off(pvc->main);
 240                 if (pvc->ether)
 241                         if (netif_carrier_ok(pvc->ether))
 242                                 netif_carrier_off(pvc->ether);
 243         }
 244 }
 245
 246
 247 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 248 {
 249         struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
 250
 251         while (*pvc_p) {
 252                 if (!pvc_is_used(*pvc_p)) {
 253                         struct pvc_device *pvc = *pvc_p;
 254 #ifdef DEBUG_PVC
 255                         printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
 256 #endif
 257                         *pvc_p = pvc->next;
 258                         kfree(pvc);
 259                         continue;
 260                 }
 261                 pvc_p = &(*pvc_p)->next;
 262         }
 263 }
 264
 265
 266 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
 267                                             int type)
 268 {
 269         if (type == ARPHRD_ETHER)
 270                 return &pvc->ether;
 271         else
 272                 return &pvc->main;
 273 }
 274
 275
 276 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 277 {
 278         struct sk_buff *skb = *skb_p;
 279
 280         if (!skb->dev) { /* Control packets */
 281                 switch (dlci) {
 282                 case LMI_CCITT_ANSI_DLCI:
 283                         skb_push(skb, 4);
 284                         skb->data[3] = NLPID_CCITT_ANSI_LMI;
 285                         break;
 286
 287                 case LMI_CISCO_DLCI:
 288                         skb_push(skb, 4);
 289                         skb->data[3] = NLPID_CISCO_LMI;
 290                         break;
 291
 292                 default:
 293                         return -EINVAL;
 294                 }
 295
 296         } else if (skb->dev->type == ARPHRD_DLCI) {
 297                 switch (skb->protocol) {
 298                 case htons(ETH_P_IP):
 299                         skb_push(skb, 4);
 300                         skb->data[3] = NLPID_IP;
 301                         break;
 302
 303                 case htons(ETH_P_IPV6):
 304                         skb_push(skb, 4);
 305                         skb->data[3] = NLPID_IPV6;
 306                         break;
 307
 308                 default:
 309                         skb_push(skb, 10);
 310                         skb->data[3] = FR_PAD;
 311                         skb->data[4] = NLPID_SNAP;
 312                         /* OUI 00-00-00 indicates an Ethertype follows */
 313                         skb->data[5] = 0x00;
 314                         skb->data[6] = 0x00;
 315                         skb->data[7] = 0x00;
 316                         /* This should be an Ethertype: */
 317                         *(__be16 *)(skb->data + 8) = skb->protocol;
 318                 }
 319
 320         } else if (skb->dev->type == ARPHRD_ETHER) {
 321                 if (skb_headroom(skb) < 10) {
 322                         struct sk_buff *skb2 = skb_realloc_headroom(skb, 10);
 323                         if (!skb2)
 324                                 return -ENOBUFS;
 325                         dev_kfree_skb(skb);
 326                         skb = *skb_p = skb2;
 327                 }
 328                 skb_push(skb, 10);
 329                 skb->data[3] = FR_PAD;
 330                 skb->data[4] = NLPID_SNAP;
 331                 /* OUI 00-80-C2 stands for the 802.1 organization */
 332                 skb->data[5] = 0x00;
 333                 skb->data[6] = 0x80;
 334                 skb->data[7] = 0xC2;
 335                 /* PID 00-07 stands for Ethernet frames without FCS */
 336                 skb->data[8] = 0x00;
 337                 skb->data[9] = 0x07;
 338
 339         } else {
 340                 return -EINVAL;
 341         }
 342
 343         dlci_to_q922(skb->data, dlci);
 344         skb->data[2] = FR_UI;
 345         return 0;
 346 }
 347
 348
 349
 350 static int pvc_open(struct net_device *dev)
 351 {
 352         struct pvc_device *pvc = dev->ml_priv;
 353
 354         if ((pvc->frad->flags & IFF_UP) == 0)
 355                 return -EIO;  /* Frad must be UP in order to activate PVC */
 356
 357         if (pvc->open_count++ == 0) {
 358                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 359                 if (state(hdlc)->settings.lmi == LMI_NONE)
 360                         pvc->state.active = netif_carrier_ok(pvc->frad);
 361
 362                 pvc_carrier(pvc->state.active, pvc);
 363                 state(hdlc)->dce_changed = 1;
 364         }
 365         return 0;
 366 }
 367
 368
 369
 370 static int pvc_close(struct net_device *dev)
 371 {
 372         struct pvc_device *pvc = dev->ml_priv;
 373
 374         if (--pvc->open_count == 0) {
 375                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 376                 if (state(hdlc)->settings.lmi == LMI_NONE)
 377                         pvc->state.active = 0;
 378
 379                 if (state(hdlc)->settings.dce) {
 380                         state(hdlc)->dce_changed = 1;
 381                         pvc->state.active = 0;
 382                 }
 383         }
 384         return 0;
 385 }
 386
 387
 388
 389 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 390 {
 391         struct pvc_device *pvc = dev->ml_priv;
 392         fr_proto_pvc_info info;
 393
 394         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 395                 if (dev->type == ARPHRD_ETHER)
 396                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 397                 else
 398                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 399
 400                 if (ifr->ifr_settings.size < sizeof(info)) {
 401                         /* data size wanted */
 402                         ifr->ifr_settings.size = sizeof(info);
 403                         return -ENOBUFS;
 404                 }
 405
 406                 info.dlci = pvc->dlci;
 407                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 408                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 409                                  &info, sizeof(info)))
 410                         return -EFAULT;
 411                 return 0;
 412         }
 413
 414         return -EINVAL;
 415 }
 416
 417 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 418 {
 419         struct pvc_device *pvc = dev->ml_priv;
 420
 421         if (pvc->state.active) {
 422                 if (dev->type == ARPHRD_ETHER) {
 423                         int pad = ETH_ZLEN - skb->len;
 424                         if (pad > 0) { /* Pad the frame with zeros */
 425                                 int len = skb->len;
 426                                 if (skb_tailroom(skb) < pad)
 427                                         if (pskb_expand_head(skb, 0, pad,
 428                                                              GFP_ATOMIC)) {
 429                                                 dev->stats.tx_dropped++;
 430                                                 dev_kfree_skb(skb);
 431                                                 return NETDEV_TX_OK;
 432                                         }
 433                                 skb_put(skb, pad);
 434                                 memset(skb->data + len, 0, pad);
 435                         }
 436                 }
 437                 skb->dev = dev;
 438                 if (!fr_hard_header(&skb, pvc->dlci)) {
 439                         dev->stats.tx_bytes += skb->len;
 440                         dev->stats.tx_packets++;
 441                         if (pvc->state.fecn) /* TX Congestion counter */
 442                                 dev->stats.tx_compressed++;
 443                         skb->dev = pvc->frad;
 444                         skb->protocol = htons(ETH_P_HDLC);
 445                         skb_reset_network_header(skb);
 446                         dev_queue_xmit(skb);
 447                         return NETDEV_TX_OK;
 448                 }
 449         }
 450
 451         dev->stats.tx_dropped++;
 452         dev_kfree_skb(skb);
 453         return NETDEV_TX_OK;
 454 }
 455
 456 static inline void fr_log_dlci_active(struct pvc_device *pvc)
 457 {
 458         netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
 459                     pvc->dlci,
 460                     pvc->main ? pvc->main->name : "",
 461                     pvc->main && pvc->ether ? " " : "",
 462                     pvc->ether ? pvc->ether->name : "",
 463                     pvc->state.new ? " new" : "",
 464                     !pvc->state.exist ? "deleted" :
 465                     pvc->state.active ? "active" : "inactive");
 466 }
 467
 468
 469
 470 static inline u8 fr_lmi_nextseq(u8 x)
 471 {
 472         x++;
 473         return x ? x : 1;
 474 }
 475
 476
 477 static void fr_lmi_send(struct net_device *dev, int fullrep)
 478 {
 479         hdlc_device *hdlc = dev_to_hdlc(dev);
 480         struct sk_buff *skb;
 481         struct pvc_device *pvc = state(hdlc)->first_pvc;
 482         int lmi = state(hdlc)->settings.lmi;
 483         int dce = state(hdlc)->settings.dce;
 484         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 485         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 486         u8 *data;
 487         int i = 0;
 488
 489         if (dce && fullrep) {
 490                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 491                 if (len > HDLC_MAX_MRU) {
 492                         netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
 493                         return;
 494                 }
 495         }
 496
 497         skb = dev_alloc_skb(len);
 498         if (!skb) {
 499                 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
 500                 return;
 501         }
 502         memset(skb->data, 0, len);
 503         skb_reserve(skb, 4);
 504         if (lmi == LMI_CISCO) {
 505                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 506         } else {
 507                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 508         }
 509         data = skb_tail_pointer(skb);
 510         data[i++] = LMI_CALLREF;
 511         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 512         if (lmi == LMI_ANSI)
 513                 data[i++] = LMI_ANSI_LOCKSHIFT;
 514         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 515                 LMI_ANSI_CISCO_REPTYPE;
 516         data[i++] = LMI_REPT_LEN;
 517         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 518         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 519         data[i++] = LMI_INTEG_LEN;
 520         data[i++] = state(hdlc)->txseq =
 521                 fr_lmi_nextseq(state(hdlc)->txseq);
 522         data[i++] = state(hdlc)->rxseq;
 523
 524         if (dce && fullrep) {
 525                 while (pvc) {
 526                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 527                                 LMI_ANSI_CISCO_PVCSTAT;
 528                         data[i++] = stat_len;
 529
 530                         /* LMI start/restart */
 531                         if (state(hdlc)->reliable && !pvc->state.exist) {
 532                                 pvc->state.exist = pvc->state.new = 1;
 533                                 fr_log_dlci_active(pvc);
 534                         }
 535
 536                         /* ifconfig PVC up */
 537                         if (pvc->open_count && !pvc->state.active &&
 538                             pvc->state.exist && !pvc->state.new) {
 539                                 pvc_carrier(1, pvc);
 540                                 pvc->state.active = 1;
 541                                 fr_log_dlci_active(pvc);
 542                         }
 543
 544                         if (lmi == LMI_CISCO) {
 545                                 data[i] = pvc->dlci >> 8;
 546                                 data[i + 1] = pvc->dlci & 0xFF;
 547                         } else {
 548                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 549                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 550                                 data[i + 2] = 0x80;
 551                         }
 552
 553                         if (pvc->state.new)
 554                                 data[i + 2] |= 0x08;
 555                         else if (pvc->state.active)
 556                                 data[i + 2] |= 0x02;
 557
 558                         i += stat_len;
 559                         pvc = pvc->next;
 560                 }
 561         }
 562
 563         skb_put(skb, i);
 564         skb->priority = TC_PRIO_CONTROL;
 565         skb->dev = dev;
 566         skb->protocol = htons(ETH_P_HDLC);
 567         skb_reset_network_header(skb);
 568
 569         dev_queue_xmit(skb);
 570 }
 571
 572
 573
 574 static void fr_set_link_state(int reliable, struct net_device *dev)
 575 {
 576         hdlc_device *hdlc = dev_to_hdlc(dev);
 577         struct pvc_device *pvc = state(hdlc)->first_pvc;
 578
 579         state(hdlc)->reliable = reliable;
 580         if (reliable) {
 581                 netif_dormant_off(dev);
 582                 state(hdlc)->n391cnt = 0; /* Request full status */
 583                 state(hdlc)->dce_changed = 1;
 584
 585                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 586                         while (pvc) {   /* Activate all PVCs */
 587                                 pvc_carrier(1, pvc);
 588                                 pvc->state.exist = pvc->state.active = 1;
 589                                 pvc->state.new = 0;
 590                                 pvc = pvc->next;
 591                         }
 592                 }
 593         } else {
 594                 netif_dormant_on(dev);
 595                 while (pvc) {           /* Deactivate all PVCs */
 596                         pvc_carrier(0, pvc);
 597                         pvc->state.exist = pvc->state.active = 0;
 598                         pvc->state.new = 0;
 599                         if (!state(hdlc)->settings.dce)
 600                                 pvc->state.bandwidth = 0;
 601                         pvc = pvc->next;
 602                 }
 603         }
 604 }
 605
 606
 607 static void fr_timer(unsigned long arg)
 608 {
 609         struct net_device *dev = (struct net_device *)arg;
 610         hdlc_device *hdlc = dev_to_hdlc(dev);
 611         int i, cnt = 0, reliable;
 612         u32 list;
 613
 614         if (state(hdlc)->settings.dce) {
 615                 reliable = state(hdlc)->request &&
 616                         time_before(jiffies, state(hdlc)->last_poll +
 617                                     state(hdlc)->settings.t392 * HZ);
 618                 state(hdlc)->request = 0;
 619         } else {
 620                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 621                 if (state(hdlc)->request) {
 622                         if (state(hdlc)->reliable)
 623                                 netdev_info(dev, "No LMI status reply received\n");
 624                         state(hdlc)->last_errors |= 1;
 625                 }
 626
 627                 list = state(hdlc)->last_errors;
 628                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 629                         cnt += (list & 1);      /* errors count */
 630
 631                 reliable = (cnt < state(hdlc)->settings.n392);
 632         }
 633
 634         if (state(hdlc)->reliable != reliable) {
 635                 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
 636                 fr_set_link_state(reliable, dev);
 637         }
 638
 639         if (state(hdlc)->settings.dce)
 640                 state(hdlc)->timer.expires = jiffies +
 641                         state(hdlc)->settings.t392 * HZ;
 642         else {
 643                 if (state(hdlc)->n391cnt)
 644                         state(hdlc)->n391cnt--;
 645
 646                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 647
 648                 state(hdlc)->last_poll = jiffies;
 649                 state(hdlc)->request = 1;
 650                 state(hdlc)->timer.expires = jiffies +
 651                         state(hdlc)->settings.t391 * HZ;
 652         }
 653
 654         state(hdlc)->timer.function = fr_timer;
 655         state(hdlc)->timer.data = arg;
 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                 init_timer(&state(hdlc)->timer);
1014                 /* First poll after 1 s */
1015                 state(hdlc)->timer.expires = jiffies + HZ;
1016                 state(hdlc)->timer.function = fr_timer;
1017                 state(hdlc)->timer.data = (unsigned long)dev;
1018                 add_timer(&state(hdlc)->timer);
1019         } else
1020                 fr_set_link_state(1, dev);
1021 }
1022
1023
1024 static void fr_stop(struct net_device *dev)
1025 {
1026         hdlc_device *hdlc = dev_to_hdlc(dev);
1027 #ifdef DEBUG_LINK
1028         printk(KERN_DEBUG "fr_stop\n");
1029 #endif
1030         if (state(hdlc)->settings.lmi != LMI_NONE)
1031                 del_timer_sync(&state(hdlc)->timer);
1032         fr_set_link_state(0, dev);
1033 }
1034
1035
1036 static void fr_close(struct net_device *dev)
1037 {
1038         hdlc_device *hdlc = dev_to_hdlc(dev);
1039         struct pvc_device *pvc = state(hdlc)->first_pvc;
1040
1041         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1042                 if (pvc->main)
1043                         dev_close(pvc->main);
1044                 if (pvc->ether)
1045                         dev_close(pvc->ether);
1046                 pvc = pvc->next;
1047         }
1048 }
1049
1050
1051 static void pvc_setup(struct net_device *dev)
1052 {
1053         dev->type = ARPHRD_DLCI;
1054         dev->flags = IFF_POINTOPOINT;
1055         dev->hard_header_len = 10;
1056         dev->addr_len = 2;
1057         netif_keep_dst(dev);
1058 }
1059
1060 static const struct net_device_ops pvc_ops = {
1061         .ndo_open       = pvc_open,
1062         .ndo_stop       = pvc_close,
1063         .ndo_change_mtu = hdlc_change_mtu,
1064         .ndo_start_xmit = pvc_xmit,
1065         .ndo_do_ioctl   = pvc_ioctl,
1066 };
1067
1068 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1069 {
1070         hdlc_device *hdlc = dev_to_hdlc(frad);
1071         struct pvc_device *pvc;
1072         struct net_device *dev;
1073         int used;
1074
1075         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1076                 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1077                 return -ENOBUFS;
1078         }
1079
1080         if (*get_dev_p(pvc, type))
1081                 return -EEXIST;
1082
1083         used = pvc_is_used(pvc);
1084
1085         if (type == ARPHRD_ETHER)
1086                 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1087                                    ether_setup);
1088         else
1089                 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1090
1091         if (!dev) {
1092                 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1093                 delete_unused_pvcs(hdlc);
1094                 return -ENOBUFS;
1095         }
1096
1097         if (type == ARPHRD_ETHER) {
1098                 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1099                 eth_hw_addr_random(dev);
1100         } else {
1101                 *(__be16*)dev->dev_addr = htons(dlci);
1102                 dlci_to_q922(dev->broadcast, dlci);
1103         }
1104         dev->netdev_ops = &pvc_ops;
1105         dev->mtu = HDLC_MAX_MTU;
1106         dev->priv_flags |= IFF_NO_QUEUE;
1107         dev->ml_priv = pvc;
1108
1109         if (register_netdevice(dev) != 0) {
1110                 free_netdev(dev);
1111                 delete_unused_pvcs(hdlc);
1112                 return -EIO;
1113         }
1114
1115         dev->destructor = free_netdev;
1116         *get_dev_p(pvc, type) = dev;
1117         if (!used) {
1118                 state(hdlc)->dce_changed = 1;
1119                 state(hdlc)->dce_pvc_count++;
1120         }
1121         return 0;
1122 }
1123
1124
1125
1126 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1127 {
1128         struct pvc_device *pvc;
1129         struct net_device *dev;
1130
1131         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1132                 return -ENOENT;
1133
1134         if ((dev = *get_dev_p(pvc, type)) == NULL)
1135                 return -ENOENT;
1136
1137         if (dev->flags & IFF_UP)
1138                 return -EBUSY;          /* PVC in use */
1139
1140         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1141         *get_dev_p(pvc, type) = NULL;
1142
1143         if (!pvc_is_used(pvc)) {
1144                 state(hdlc)->dce_pvc_count--;
1145                 state(hdlc)->dce_changed = 1;
1146         }
1147         delete_unused_pvcs(hdlc);
1148         return 0;
1149 }
1150
1151
1152
1153 static void fr_destroy(struct net_device *frad)
1154 {
1155         hdlc_device *hdlc = dev_to_hdlc(frad);
1156         struct pvc_device *pvc = state(hdlc)->first_pvc;
1157         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1158         state(hdlc)->dce_pvc_count = 0;
1159         state(hdlc)->dce_changed = 1;
1160
1161         while (pvc) {
1162                 struct pvc_device *next = pvc->next;
1163                 /* destructors will free_netdev() main and ether */
1164                 if (pvc->main)
1165                         unregister_netdevice(pvc->main);
1166
1167                 if (pvc->ether)
1168                         unregister_netdevice(pvc->ether);
1169
1170                 kfree(pvc);
1171                 pvc = next;
1172         }
1173 }
1174
1175
1176 static struct hdlc_proto proto = {
1177         .close          = fr_close,
1178         .start          = fr_start,
1179         .stop           = fr_stop,
1180         .detach         = fr_destroy,
1181         .ioctl          = fr_ioctl,
1182         .netif_rx       = fr_rx,
1183         .module         = THIS_MODULE,
1184 };
1185
1186
1187 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1188 {
1189         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1190         const size_t size = sizeof(fr_proto);
1191         fr_proto new_settings;
1192         hdlc_device *hdlc = dev_to_hdlc(dev);
1193         fr_proto_pvc pvc;
1194         int result;
1195
1196         switch (ifr->ifr_settings.type) {
1197         case IF_GET_PROTO:
1198                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1199                         return -EINVAL;
1200                 ifr->ifr_settings.type = IF_PROTO_FR;
1201                 if (ifr->ifr_settings.size < size) {
1202                         ifr->ifr_settings.size = size; /* data size wanted */
1203                         return -ENOBUFS;
1204                 }
1205                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1206                         return -EFAULT;
1207                 return 0;
1208
1209         case IF_PROTO_FR:
1210                 if (!capable(CAP_NET_ADMIN))
1211                         return -EPERM;
1212
1213                 if (dev->flags & IFF_UP)
1214                         return -EBUSY;
1215
1216                 if (copy_from_user(&new_settings, fr_s, size))
1217                         return -EFAULT;
1218
1219                 if (new_settings.lmi == LMI_DEFAULT)
1220                         new_settings.lmi = LMI_ANSI;
1221
1222                 if ((new_settings.lmi != LMI_NONE &&
1223                      new_settings.lmi != LMI_ANSI &&
1224                      new_settings.lmi != LMI_CCITT &&
1225                      new_settings.lmi != LMI_CISCO) ||
1226                     new_settings.t391 < 1 ||
1227                     new_settings.t392 < 2 ||
1228                     new_settings.n391 < 1 ||
1229                     new_settings.n392 < 1 ||
1230                     new_settings.n393 < new_settings.n392 ||
1231                     new_settings.n393 > 32 ||
1232                     (new_settings.dce != 0 &&
1233                      new_settings.dce != 1))
1234                         return -EINVAL;
1235
1236                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1237                 if (result)
1238                         return result;
1239
1240                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1241                         result = attach_hdlc_protocol(dev, &proto,
1242                                                       sizeof(struct frad_state));
1243                         if (result)
1244                                 return result;
1245                         state(hdlc)->first_pvc = NULL;
1246                         state(hdlc)->dce_pvc_count = 0;
1247                 }
1248                 memcpy(&state(hdlc)->settings, &new_settings, size);
1249                 dev->type = ARPHRD_FRAD;
1250                 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1251                 return 0;
1252
1253         case IF_PROTO_FR_ADD_PVC:
1254         case IF_PROTO_FR_DEL_PVC:
1255         case IF_PROTO_FR_ADD_ETH_PVC:
1256         case IF_PROTO_FR_DEL_ETH_PVC:
1257                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1258                         return -EINVAL;
1259
1260                 if (!capable(CAP_NET_ADMIN))
1261                         return -EPERM;
1262
1263                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1264                                    sizeof(fr_proto_pvc)))
1265                         return -EFAULT;
1266
1267                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1268                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1269
1270                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1271                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1272                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1273                 else
1274                         result = ARPHRD_DLCI;
1275
1276                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1277                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1278                         return fr_add_pvc(dev, pvc.dlci, result);
1279                 else
1280                         return fr_del_pvc(hdlc, pvc.dlci, result);
1281         }
1282
1283         return -EINVAL;
1284 }
1285
1286
1287 static int __init mod_init(void)
1288 {
1289         register_hdlc_protocol(&proto);
1290         return 0;
1291 }
1292
1293
1294 static void __exit mod_exit(void)
1295 {
1296         unregister_hdlc_protocol(&proto);
1297 }
1298
1299
1300 module_init(mod_init);
1301 module_exit(mod_exit);
1302
1303 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1304 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1305 MODULE_LICENSE("GPL v2");