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/module.h>
  37 #include <linux/kernel.h>
  38 #include <linux/slab.h>
  39 #include <linux/poll.h>
  40 #include <linux/errno.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/init.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/pkt_sched.h>
  45 #include <linux/inetdevice.h>
  46 #include <linux/lapb.h>
  47 #include <linux/rtnetlink.h>
  48 #include <linux/etherdevice.h>
  49 #include <linux/hdlc.h>
  50
  51 #undef DEBUG_PKT
  52 #undef DEBUG_ECN
  53 #undef DEBUG_LINK
  54 #undef DEBUG_PROTO
  55 #undef DEBUG_PVC
  56
  57 #define FR_UI                   0x03
  58 #define FR_PAD                  0x00
  59
  60 #define NLPID_IP                0xCC
  61 #define NLPID_IPV6              0x8E
  62 #define NLPID_SNAP              0x80
  63 #define NLPID_PAD               0x00
  64 #define NLPID_CCITT_ANSI_LMI    0x08
  65 #define NLPID_CISCO_LMI         0x09
  66
  67
  68 #define LMI_CCITT_ANSI_DLCI        0 /* LMI DLCI */
  69 #define LMI_CISCO_DLCI          1023
  70
  71 #define LMI_CALLREF             0x00 /* Call Reference */
  72 #define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI locking shift */
  73 #define LMI_ANSI_CISCO_REPTYPE  0x01 /* report type */
  74 #define LMI_CCITT_REPTYPE       0x51
  75 #define LMI_ANSI_CISCO_ALIVE    0x03 /* keep alive */
  76 #define LMI_CCITT_ALIVE         0x53
  77 #define LMI_ANSI_CISCO_PVCSTAT  0x07 /* PVC status */
  78 #define LMI_CCITT_PVCSTAT       0x57
  79
  80 #define LMI_FULLREP             0x00 /* full report  */
  81 #define LMI_INTEGRITY           0x01 /* link integrity report */
  82 #define LMI_SINGLE              0x02 /* single PVC report */
  83
  84 #define LMI_STATUS_ENQUIRY      0x75
  85 #define LMI_STATUS              0x7D /* reply */
  86
  87 #define LMI_REPT_LEN               1 /* report type element length */
  88 #define LMI_INTEG_LEN              2 /* link integrity element length */
  89
  90 #define LMI_CCITT_CISCO_LENGTH    13 /* LMI frame lengths */
  91 #define LMI_ANSI_LENGTH           14
  92
  93
  94 typedef struct {
  95 #if defined(__LITTLE_ENDIAN_BITFIELD)
  96         unsigned ea1:   1;
  97         unsigned cr:    1;
  98         unsigned dlcih: 6;
  99
 100         unsigned ea2:   1;
 101         unsigned de:    1;
 102         unsigned becn:  1;
 103         unsigned fecn:  1;
 104         unsigned dlcil: 4;
 105 #else
 106         unsigned dlcih: 6;
 107         unsigned cr:    1;
 108         unsigned ea1:   1;
 109
 110         unsigned dlcil: 4;
 111         unsigned fecn:  1;
 112         unsigned becn:  1;
 113         unsigned de:    1;
 114         unsigned ea2:   1;
 115 #endif
 116 }__attribute__ ((packed)) fr_hdr;
 117
 118
 119 typedef struct pvc_device_struct {
 120         struct net_device *frad;
 121         struct net_device *main;
 122         struct net_device *ether;       /* bridged Ethernet interface   */
 123         struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
 124         int dlci;
 125         int open_count;
 126
 127         struct {
 128                 unsigned int new: 1;
 129                 unsigned int active: 1;
 130                 unsigned int exist: 1;
 131                 unsigned int deleted: 1;
 132                 unsigned int fecn: 1;
 133                 unsigned int becn: 1;
 134                 unsigned int bandwidth; /* Cisco LMI reporting only */
 135         }state;
 136 }pvc_device;
 137
 138 struct frad_state {
 139         fr_proto settings;
 140         pvc_device *first_pvc;
 141         int dce_pvc_count;
 142
 143         struct timer_list timer;
 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 pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
 179 {
 180         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 listed is sorted */
 187                 pvc = pvc->next;
 188         }
 189
 190         return NULL;
 191 }
 192
 193
 194 static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
 195 {
 196         hdlc_device *hdlc = dev_to_hdlc(dev);
 197         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_device), 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(pvc_device *pvc)
 223 {
 224         return pvc->main || pvc->ether;
 225 }
 226
 227
 228 static inline void pvc_carrier(int on, 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         pvc_device **pvc_p = &state(hdlc)->first_pvc;
 251
 252         while (*pvc_p) {
 253                 if (!pvc_is_used(*pvc_p)) {
 254                         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(pvc_device *pvc, 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         u16 head_len;
 279         struct sk_buff *skb = *skb_p;
 280
 281         switch (skb->protocol) {
 282         case __constant_htons(NLPID_CCITT_ANSI_LMI):
 283                 head_len = 4;
 284                 skb_push(skb, head_len);
 285                 skb->data[3] = NLPID_CCITT_ANSI_LMI;
 286                 break;
 287
 288         case __constant_htons(NLPID_CISCO_LMI):
 289                 head_len = 4;
 290                 skb_push(skb, head_len);
 291                 skb->data[3] = NLPID_CISCO_LMI;
 292                 break;
 293
 294         case __constant_htons(ETH_P_IP):
 295                 head_len = 4;
 296                 skb_push(skb, head_len);
 297                 skb->data[3] = NLPID_IP;
 298                 break;
 299
 300         case __constant_htons(ETH_P_IPV6):
 301                 head_len = 4;
 302                 skb_push(skb, head_len);
 303                 skb->data[3] = NLPID_IPV6;
 304                 break;
 305
 306         case __constant_htons(ETH_P_802_3):
 307                 head_len = 10;
 308                 if (skb_headroom(skb) < head_len) {
 309                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 310                                                                     head_len);
 311                         if (!skb2)
 312                                 return -ENOBUFS;
 313                         dev_kfree_skb(skb);
 314                         skb = *skb_p = skb2;
 315                 }
 316                 skb_push(skb, head_len);
 317                 skb->data[3] = FR_PAD;
 318                 skb->data[4] = NLPID_SNAP;
 319                 skb->data[5] = FR_PAD;
 320                 skb->data[6] = 0x80;
 321                 skb->data[7] = 0xC2;
 322                 skb->data[8] = 0x00;
 323                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 324                 break;
 325
 326         default:
 327                 head_len = 10;
 328                 skb_push(skb, head_len);
 329                 skb->data[3] = FR_PAD;
 330                 skb->data[4] = NLPID_SNAP;
 331                 skb->data[5] = FR_PAD;
 332                 skb->data[6] = FR_PAD;
 333                 skb->data[7] = FR_PAD;
 334                 *(__be16*)(skb->data + 8) = skb->protocol;
 335         }
 336
 337         dlci_to_q922(skb->data, dlci);
 338         skb->data[2] = FR_UI;
 339         return 0;
 340 }
 341
 342
 343
 344 static int pvc_open(struct net_device *dev)
 345 {
 346         pvc_device *pvc = dev->priv;
 347
 348         if ((pvc->frad->flags & IFF_UP) == 0)
 349                 return -EIO;  /* Frad must be UP in order to activate PVC */
 350
 351         if (pvc->open_count++ == 0) {
 352                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 353                 if (state(hdlc)->settings.lmi == LMI_NONE)
 354                         pvc->state.active = netif_carrier_ok(pvc->frad);
 355
 356                 pvc_carrier(pvc->state.active, pvc);
 357                 state(hdlc)->dce_changed = 1;
 358         }
 359         return 0;
 360 }
 361
 362
 363
 364 static int pvc_close(struct net_device *dev)
 365 {
 366         pvc_device *pvc = dev->priv;
 367
 368         if (--pvc->open_count == 0) {
 369                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 370                 if (state(hdlc)->settings.lmi == LMI_NONE)
 371                         pvc->state.active = 0;
 372
 373                 if (state(hdlc)->settings.dce) {
 374                         state(hdlc)->dce_changed = 1;
 375                         pvc->state.active = 0;
 376                 }
 377         }
 378         return 0;
 379 }
 380
 381
 382
 383 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 384 {
 385         pvc_device *pvc = dev->priv;
 386         fr_proto_pvc_info info;
 387
 388         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 389                 if (dev->type == ARPHRD_ETHER)
 390                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 391                 else
 392                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 393
 394                 if (ifr->ifr_settings.size < sizeof(info)) {
 395                         /* data size wanted */
 396                         ifr->ifr_settings.size = sizeof(info);
 397                         return -ENOBUFS;
 398                 }
 399
 400                 info.dlci = pvc->dlci;
 401                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 402                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 403                                  &info, sizeof(info)))
 404                         return -EFAULT;
 405                 return 0;
 406         }
 407
 408         return -EINVAL;
 409 }
 410
 411 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 412 {
 413         pvc_device *pvc = dev->priv;
 414
 415         if (pvc->state.active) {
 416                 if (dev->type == ARPHRD_ETHER) {
 417                         int pad = ETH_ZLEN - skb->len;
 418                         if (pad > 0) { /* Pad the frame with zeros */
 419                                 int len = skb->len;
 420                                 if (skb_tailroom(skb) < pad)
 421                                         if (pskb_expand_head(skb, 0, pad,
 422                                                              GFP_ATOMIC)) {
 423                                                 dev->stats.tx_dropped++;
 424                                                 dev_kfree_skb(skb);
 425                                                 return 0;
 426                                         }
 427                                 skb_put(skb, pad);
 428                                 memset(skb->data + len, 0, pad);
 429                         }
 430                         skb->protocol = __constant_htons(ETH_P_802_3);
 431                 }
 432                 if (!fr_hard_header(&skb, pvc->dlci)) {
 433                         dev->stats.tx_bytes += skb->len;
 434                         dev->stats.tx_packets++;
 435                         if (pvc->state.fecn) /* TX Congestion counter */
 436                                 dev->stats.tx_compressed++;
 437                         skb->dev = pvc->frad;
 438                         dev_queue_xmit(skb);
 439                         return 0;
 440                 }
 441         }
 442
 443         dev->stats.tx_dropped++;
 444         dev_kfree_skb(skb);
 445         return 0;
 446 }
 447
 448
 449
 450 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
 451 {
 452         if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
 453                 return -EINVAL;
 454         dev->mtu = new_mtu;
 455         return 0;
 456 }
 457
 458
 459
 460 static inline void fr_log_dlci_active(pvc_device *pvc)
 461 {
 462         printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
 463                pvc->frad->name,
 464                pvc->dlci,
 465                pvc->main ? pvc->main->name : "",
 466                pvc->main && pvc->ether ? " " : "",
 467                pvc->ether ? pvc->ether->name : "",
 468                pvc->state.new ? " new" : "",
 469                !pvc->state.exist ? "deleted" :
 470                pvc->state.active ? "active" : "inactive");
 471 }
 472
 473
 474
 475 static inline u8 fr_lmi_nextseq(u8 x)
 476 {
 477         x++;
 478         return x ? x : 1;
 479 }
 480
 481
 482 static void fr_lmi_send(struct net_device *dev, int fullrep)
 483 {
 484         hdlc_device *hdlc = dev_to_hdlc(dev);
 485         struct sk_buff *skb;
 486         pvc_device *pvc = state(hdlc)->first_pvc;
 487         int lmi = state(hdlc)->settings.lmi;
 488         int dce = state(hdlc)->settings.dce;
 489         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 490         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 491         u8 *data;
 492         int i = 0;
 493
 494         if (dce && fullrep) {
 495                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 496                 if (len > HDLC_MAX_MRU) {
 497                         printk(KERN_WARNING "%s: Too many PVCs while sending "
 498                                "LMI full report\n", dev->name);
 499                         return;
 500                 }
 501         }
 502
 503         skb = dev_alloc_skb(len);
 504         if (!skb) {
 505                 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
 506                        dev->name);
 507                 return;
 508         }
 509         memset(skb->data, 0, len);
 510         skb_reserve(skb, 4);
 511         if (lmi == LMI_CISCO) {
 512                 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
 513                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 514         } else {
 515                 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
 516                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 517         }
 518         data = skb_tail_pointer(skb);
 519         data[i++] = LMI_CALLREF;
 520         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 521         if (lmi == LMI_ANSI)
 522                 data[i++] = LMI_ANSI_LOCKSHIFT;
 523         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 524                 LMI_ANSI_CISCO_REPTYPE;
 525         data[i++] = LMI_REPT_LEN;
 526         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 527         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 528         data[i++] = LMI_INTEG_LEN;
 529         data[i++] = state(hdlc)->txseq =
 530                 fr_lmi_nextseq(state(hdlc)->txseq);
 531         data[i++] = state(hdlc)->rxseq;
 532
 533         if (dce && fullrep) {
 534                 while (pvc) {
 535                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 536                                 LMI_ANSI_CISCO_PVCSTAT;
 537                         data[i++] = stat_len;
 538
 539                         /* LMI start/restart */
 540                         if (state(hdlc)->reliable && !pvc->state.exist) {
 541                                 pvc->state.exist = pvc->state.new = 1;
 542                                 fr_log_dlci_active(pvc);
 543                         }
 544
 545                         /* ifconfig PVC up */
 546                         if (pvc->open_count && !pvc->state.active &&
 547                             pvc->state.exist && !pvc->state.new) {
 548                                 pvc_carrier(1, pvc);
 549                                 pvc->state.active = 1;
 550                                 fr_log_dlci_active(pvc);
 551                         }
 552
 553                         if (lmi == LMI_CISCO) {
 554                                 data[i] = pvc->dlci >> 8;
 555                                 data[i + 1] = pvc->dlci & 0xFF;
 556                         } else {
 557                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 558                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 559                                 data[i + 2] = 0x80;
 560                         }
 561
 562                         if (pvc->state.new)
 563                                 data[i + 2] |= 0x08;
 564                         else if (pvc->state.active)
 565                                 data[i + 2] |= 0x02;
 566
 567                         i += stat_len;
 568                         pvc = pvc->next;
 569                 }
 570         }
 571
 572         skb_put(skb, i);
 573         skb->priority = TC_PRIO_CONTROL;
 574         skb->dev = dev;
 575         skb_reset_network_header(skb);
 576
 577         dev_queue_xmit(skb);
 578 }
 579
 580
 581
 582 static void fr_set_link_state(int reliable, struct net_device *dev)
 583 {
 584         hdlc_device *hdlc = dev_to_hdlc(dev);
 585         pvc_device *pvc = state(hdlc)->first_pvc;
 586
 587         state(hdlc)->reliable = reliable;
 588         if (reliable) {
 589                 netif_dormant_off(dev);
 590                 state(hdlc)->n391cnt = 0; /* Request full status */
 591                 state(hdlc)->dce_changed = 1;
 592
 593                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 594                         while (pvc) {   /* Activate all PVCs */
 595                                 pvc_carrier(1, pvc);
 596                                 pvc->state.exist = pvc->state.active = 1;
 597                                 pvc->state.new = 0;
 598                                 pvc = pvc->next;
 599                         }
 600                 }
 601         } else {
 602                 netif_dormant_on(dev);
 603                 while (pvc) {           /* Deactivate all PVCs */
 604                         pvc_carrier(0, pvc);
 605                         pvc->state.exist = pvc->state.active = 0;
 606                         pvc->state.new = 0;
 607                         if (!state(hdlc)->settings.dce)
 608                                 pvc->state.bandwidth = 0;
 609                         pvc = pvc->next;
 610                 }
 611         }
 612 }
 613
 614
 615 static void fr_timer(unsigned long arg)
 616 {
 617         struct net_device *dev = (struct net_device *)arg;
 618         hdlc_device *hdlc = dev_to_hdlc(dev);
 619         int i, cnt = 0, reliable;
 620         u32 list;
 621
 622         if (state(hdlc)->settings.dce) {
 623                 reliable = state(hdlc)->request &&
 624                         time_before(jiffies, state(hdlc)->last_poll +
 625                                     state(hdlc)->settings.t392 * HZ);
 626                 state(hdlc)->request = 0;
 627         } else {
 628                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 629                 if (state(hdlc)->request) {
 630                         if (state(hdlc)->reliable)
 631                                 printk(KERN_INFO "%s: No LMI status reply "
 632                                        "received\n", dev->name);
 633                         state(hdlc)->last_errors |= 1;
 634                 }
 635
 636                 list = state(hdlc)->last_errors;
 637                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 638                         cnt += (list & 1);      /* errors count */
 639
 640                 reliable = (cnt < state(hdlc)->settings.n392);
 641         }
 642
 643         if (state(hdlc)->reliable != reliable) {
 644                 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
 645                        reliable ? "" : "un");
 646                 fr_set_link_state(reliable, dev);
 647         }
 648
 649         if (state(hdlc)->settings.dce)
 650                 state(hdlc)->timer.expires = jiffies +
 651                         state(hdlc)->settings.t392 * HZ;
 652         else {
 653                 if (state(hdlc)->n391cnt)
 654                         state(hdlc)->n391cnt--;
 655
 656                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 657
 658                 state(hdlc)->last_poll = jiffies;
 659                 state(hdlc)->request = 1;
 660                 state(hdlc)->timer.expires = jiffies +
 661                         state(hdlc)->settings.t391 * HZ;
 662         }
 663
 664         state(hdlc)->timer.function = fr_timer;
 665         state(hdlc)->timer.data = arg;
 666         add_timer(&state(hdlc)->timer);
 667 }
 668
 669
 670 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 671 {
 672         hdlc_device *hdlc = dev_to_hdlc(dev);
 673         pvc_device *pvc;
 674         u8 rxseq, txseq;
 675         int lmi = state(hdlc)->settings.lmi;
 676         int dce = state(hdlc)->settings.dce;
 677         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 678
 679         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 680                         LMI_CCITT_CISCO_LENGTH)) {
 681                 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
 682                 return 1;
 683         }
 684
 685         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 686                              NLPID_CCITT_ANSI_LMI)) {
 687                 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
 688                        dev->name);
 689                 return 1;
 690         }
 691
 692         if (skb->data[4] != LMI_CALLREF) {
 693                 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
 694                        dev->name, skb->data[4]);
 695                 return 1;
 696         }
 697
 698         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 699                 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
 700                        dev->name, skb->data[5]);
 701                 return 1;
 702         }
 703
 704         if (lmi == LMI_ANSI) {
 705                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 706                         printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
 707                                " message (0x%02X)\n", dev->name, skb->data[6]);
 708                         return 1;
 709                 }
 710                 i = 7;
 711         } else
 712                 i = 6;
 713
 714         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 715                              LMI_ANSI_CISCO_REPTYPE)) {
 716                 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
 717                        dev->name, skb->data[i]);
 718                 return 1;
 719         }
 720
 721         if (skb->data[++i] != LMI_REPT_LEN) {
 722                 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
 723                        " (%u)\n", dev->name, skb->data[i]);
 724                 return 1;
 725         }
 726
 727         reptype = skb->data[++i];
 728         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 729                 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
 730                        dev->name, reptype);
 731                 return 1;
 732         }
 733
 734         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 735                                LMI_ANSI_CISCO_ALIVE)) {
 736                 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
 737                        " IE (0x%02X)\n", dev->name, skb->data[i]);
 738                 return 1;
 739         }
 740
 741         if (skb->data[++i] != LMI_INTEG_LEN) {
 742                 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
 743                        " IE length (%u)\n", dev->name, skb->data[i]);
 744                 return 1;
 745         }
 746         i++;
 747
 748         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 749         rxseq = skb->data[i++]; /* Should confirm our sequence */
 750
 751         txseq = state(hdlc)->txseq;
 752
 753         if (dce)
 754                 state(hdlc)->last_poll = jiffies;
 755
 756         error = 0;
 757         if (!state(hdlc)->reliable)
 758                 error = 1;
 759
 760         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 761                 state(hdlc)->n391cnt = 0;
 762                 error = 1;
 763         }
 764
 765         if (dce) {
 766                 if (state(hdlc)->fullrep_sent && !error) {
 767 /* Stop sending full report - the last one has been confirmed by DTE */
 768                         state(hdlc)->fullrep_sent = 0;
 769                         pvc = state(hdlc)->first_pvc;
 770                         while (pvc) {
 771                                 if (pvc->state.new) {
 772                                         pvc->state.new = 0;
 773
 774 /* Tell DTE that new PVC is now active */
 775                                         state(hdlc)->dce_changed = 1;
 776                                 }
 777                                 pvc = pvc->next;
 778                         }
 779                 }
 780
 781                 if (state(hdlc)->dce_changed) {
 782                         reptype = LMI_FULLREP;
 783                         state(hdlc)->fullrep_sent = 1;
 784                         state(hdlc)->dce_changed = 0;
 785                 }
 786
 787                 state(hdlc)->request = 1; /* got request */
 788                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 789                 return 0;
 790         }
 791
 792         /* DTE */
 793
 794         state(hdlc)->request = 0; /* got response, no request pending */
 795
 796         if (error)
 797                 return 0;
 798
 799         if (reptype != LMI_FULLREP)
 800                 return 0;
 801
 802         pvc = state(hdlc)->first_pvc;
 803
 804         while (pvc) {
 805                 pvc->state.deleted = 1;
 806                 pvc = pvc->next;
 807         }
 808
 809         no_ram = 0;
 810         while (skb->len >= i + 2 + stat_len) {
 811                 u16 dlci;
 812                 u32 bw;
 813                 unsigned int active, new;
 814
 815                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 816                                        LMI_ANSI_CISCO_PVCSTAT)) {
 817                         printk(KERN_INFO "%s: Not an LMI PVC status IE"
 818                                " (0x%02X)\n", dev->name, skb->data[i]);
 819                         return 1;
 820                 }
 821
 822                 if (skb->data[++i] != stat_len) {
 823                         printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
 824                                " (%u)\n", dev->name, skb->data[i]);
 825                         return 1;
 826                 }
 827                 i++;
 828
 829                 new = !! (skb->data[i + 2] & 0x08);
 830                 active = !! (skb->data[i + 2] & 0x02);
 831                 if (lmi == LMI_CISCO) {
 832                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 833                         bw = (skb->data[i + 3] << 16) |
 834                                 (skb->data[i + 4] << 8) |
 835                                 (skb->data[i + 5]);
 836                 } else {
 837                         dlci = ((skb->data[i] & 0x3F) << 4) |
 838                                 ((skb->data[i + 1] & 0x78) >> 3);
 839                         bw = 0;
 840                 }
 841
 842                 pvc = add_pvc(dev, dlci);
 843
 844                 if (!pvc && !no_ram) {
 845                         printk(KERN_WARNING
 846                                "%s: Memory squeeze on fr_lmi_recv()\n",
 847                                dev->name);
 848                         no_ram = 1;
 849                 }
 850
 851                 if (pvc) {
 852                         pvc->state.exist = 1;
 853                         pvc->state.deleted = 0;
 854                         if (active != pvc->state.active ||
 855                             new != pvc->state.new ||
 856                             bw != pvc->state.bandwidth ||
 857                             !pvc->state.exist) {
 858                                 pvc->state.new = new;
 859                                 pvc->state.active = active;
 860                                 pvc->state.bandwidth = bw;
 861                                 pvc_carrier(active, pvc);
 862                                 fr_log_dlci_active(pvc);
 863                         }
 864                 }
 865
 866                 i += stat_len;
 867         }
 868
 869         pvc = state(hdlc)->first_pvc;
 870
 871         while (pvc) {
 872                 if (pvc->state.deleted && pvc->state.exist) {
 873                         pvc_carrier(0, pvc);
 874                         pvc->state.active = pvc->state.new = 0;
 875                         pvc->state.exist = 0;
 876                         pvc->state.bandwidth = 0;
 877                         fr_log_dlci_active(pvc);
 878                 }
 879                 pvc = pvc->next;
 880         }
 881
 882         /* Next full report after N391 polls */
 883         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 884
 885         return 0;
 886 }
 887
 888
 889 static int fr_rx(struct sk_buff *skb)
 890 {
 891         struct net_device *frad = skb->dev;
 892         hdlc_device *hdlc = dev_to_hdlc(frad);
 893         fr_hdr *fh = (fr_hdr*)skb->data;
 894         u8 *data = skb->data;
 895         u16 dlci;
 896         pvc_device *pvc;
 897         struct net_device *dev = NULL;
 898
 899         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 900                 goto rx_error;
 901
 902         dlci = q922_to_dlci(skb->data);
 903
 904         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 905              (state(hdlc)->settings.lmi == LMI_ANSI ||
 906               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 907             (dlci == LMI_CISCO_DLCI &&
 908              state(hdlc)->settings.lmi == LMI_CISCO)) {
 909                 if (fr_lmi_recv(frad, skb))
 910                         goto rx_error;
 911                 dev_kfree_skb_any(skb);
 912                 return NET_RX_SUCCESS;
 913         }
 914
 915         pvc = find_pvc(hdlc, dlci);
 916         if (!pvc) {
 917 #ifdef DEBUG_PKT
 918                 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
 919                        frad->name, dlci);
 920 #endif
 921                 dev_kfree_skb_any(skb);
 922                 return NET_RX_DROP;
 923         }
 924
 925         if (pvc->state.fecn != fh->fecn) {
 926 #ifdef DEBUG_ECN
 927                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 928                        dlci, fh->fecn ? "N" : "FF");
 929 #endif
 930                 pvc->state.fecn ^= 1;
 931         }
 932
 933         if (pvc->state.becn != fh->becn) {
 934 #ifdef DEBUG_ECN
 935                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 936                        dlci, fh->becn ? "N" : "FF");
 937 #endif
 938                 pvc->state.becn ^= 1;
 939         }
 940
 941
 942         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 943                 frad->stats.rx_dropped++;
 944                 return NET_RX_DROP;
 945         }
 946
 947         if (data[3] == NLPID_IP) {
 948                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 949                 dev = pvc->main;
 950                 skb->protocol = htons(ETH_P_IP);
 951
 952         } else if (data[3] == NLPID_IPV6) {
 953                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 954                 dev = pvc->main;
 955                 skb->protocol = htons(ETH_P_IPV6);
 956
 957         } else if (skb->len > 10 && data[3] == FR_PAD &&
 958                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 959                 u16 oui = ntohs(*(__be16*)(data + 6));
 960                 u16 pid = ntohs(*(__be16*)(data + 8));
 961                 skb_pull(skb, 10);
 962
 963                 switch ((((u32)oui) << 16) | pid) {
 964                 case ETH_P_ARP: /* routed frame with SNAP */
 965                 case ETH_P_IPX:
 966                 case ETH_P_IP:  /* a long variant */
 967                 case ETH_P_IPV6:
 968                         dev = pvc->main;
 969                         skb->protocol = htons(pid);
 970                         break;
 971
 972                 case 0x80C20007: /* bridged Ethernet frame */
 973                         if ((dev = pvc->ether) != NULL)
 974                                 skb->protocol = eth_type_trans(skb, dev);
 975                         break;
 976
 977                 default:
 978                         printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
 979                                "PID=%x\n", frad->name, oui, pid);
 980                         dev_kfree_skb_any(skb);
 981                         return NET_RX_DROP;
 982                 }
 983         } else {
 984                 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
 985                        "length = %i\n", frad->name, data[3], skb->len);
 986                 dev_kfree_skb_any(skb);
 987                 return NET_RX_DROP;
 988         }
 989
 990         if (dev) {
 991                 dev->stats.rx_packets++; /* PVC traffic */
 992                 dev->stats.rx_bytes += skb->len;
 993                 if (pvc->state.becn)
 994                         dev->stats.rx_compressed++;
 995                 skb->dev = dev;
 996                 netif_rx(skb);
 997                 return NET_RX_SUCCESS;
 998         } else {
 999                 dev_kfree_skb_any(skb);
1000                 return NET_RX_DROP;
1001         }
1002
1003  rx_error:
1004         frad->stats.rx_errors++; /* Mark error */
1005         dev_kfree_skb_any(skb);
1006         return NET_RX_DROP;
1007 }
1008
1009
1010
1011 static void fr_start(struct net_device *dev)
1012 {
1013         hdlc_device *hdlc = dev_to_hdlc(dev);
1014 #ifdef DEBUG_LINK
1015         printk(KERN_DEBUG "fr_start\n");
1016 #endif
1017         if (state(hdlc)->settings.lmi != LMI_NONE) {
1018                 state(hdlc)->reliable = 0;
1019                 state(hdlc)->dce_changed = 1;
1020                 state(hdlc)->request = 0;
1021                 state(hdlc)->fullrep_sent = 0;
1022                 state(hdlc)->last_errors = 0xFFFFFFFF;
1023                 state(hdlc)->n391cnt = 0;
1024                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1025
1026                 init_timer(&state(hdlc)->timer);
1027                 /* First poll after 1 s */
1028                 state(hdlc)->timer.expires = jiffies + HZ;
1029                 state(hdlc)->timer.function = fr_timer;
1030                 state(hdlc)->timer.data = (unsigned long)dev;
1031                 add_timer(&state(hdlc)->timer);
1032         } else
1033                 fr_set_link_state(1, dev);
1034 }
1035
1036
1037 static void fr_stop(struct net_device *dev)
1038 {
1039         hdlc_device *hdlc = dev_to_hdlc(dev);
1040 #ifdef DEBUG_LINK
1041         printk(KERN_DEBUG "fr_stop\n");
1042 #endif
1043         if (state(hdlc)->settings.lmi != LMI_NONE)
1044                 del_timer_sync(&state(hdlc)->timer);
1045         fr_set_link_state(0, dev);
1046 }
1047
1048
1049 static void fr_close(struct net_device *dev)
1050 {
1051         hdlc_device *hdlc = dev_to_hdlc(dev);
1052         pvc_device *pvc = state(hdlc)->first_pvc;
1053
1054         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1055                 if (pvc->main)
1056                         dev_close(pvc->main);
1057                 if (pvc->ether)
1058                         dev_close(pvc->ether);
1059                 pvc = pvc->next;
1060         }
1061 }
1062
1063
1064 static void pvc_setup(struct net_device *dev)
1065 {
1066         dev->type = ARPHRD_DLCI;
1067         dev->flags = IFF_POINTOPOINT;
1068         dev->hard_header_len = 10;
1069         dev->addr_len = 2;
1070 }
1071
1072 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1073 {
1074         hdlc_device *hdlc = dev_to_hdlc(frad);
1075         pvc_device *pvc;
1076         struct net_device *dev;
1077         int result, used;
1078
1079         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1080                 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1081                        frad->name);
1082                 return -ENOBUFS;
1083         }
1084
1085         if (*get_dev_p(pvc, type))
1086                 return -EEXIST;
1087
1088         used = pvc_is_used(pvc);
1089
1090         if (type == ARPHRD_ETHER)
1091                 dev = alloc_netdev(0, "pvceth%d", ether_setup);
1092         else
1093                 dev = alloc_netdev(0, "pvc%d", pvc_setup);
1094
1095         if (!dev) {
1096                 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1097                        frad->name);
1098                 delete_unused_pvcs(hdlc);
1099                 return -ENOBUFS;
1100         }
1101
1102         if (type == ARPHRD_ETHER)
1103                 random_ether_addr(dev->dev_addr);
1104         else {
1105                 *(__be16*)dev->dev_addr = htons(dlci);
1106                 dlci_to_q922(dev->broadcast, dlci);
1107         }
1108         dev->hard_start_xmit = pvc_xmit;
1109         dev->open = pvc_open;
1110         dev->stop = pvc_close;
1111         dev->do_ioctl = pvc_ioctl;
1112         dev->change_mtu = pvc_change_mtu;
1113         dev->mtu = HDLC_MAX_MTU;
1114         dev->tx_queue_len = 0;
1115         dev->priv = pvc;
1116
1117         result = dev_alloc_name(dev, dev->name);
1118         if (result < 0) {
1119                 free_netdev(dev);
1120                 delete_unused_pvcs(hdlc);
1121                 return result;
1122         }
1123
1124         if (register_netdevice(dev) != 0) {
1125                 free_netdev(dev);
1126                 delete_unused_pvcs(hdlc);
1127                 return -EIO;
1128         }
1129
1130         dev->destructor = free_netdev;
1131         *get_dev_p(pvc, type) = dev;
1132         if (!used) {
1133                 state(hdlc)->dce_changed = 1;
1134                 state(hdlc)->dce_pvc_count++;
1135         }
1136         return 0;
1137 }
1138
1139
1140
1141 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1142 {
1143         pvc_device *pvc;
1144         struct net_device *dev;
1145
1146         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1147                 return -ENOENT;
1148
1149         if ((dev = *get_dev_p(pvc, type)) == NULL)
1150                 return -ENOENT;
1151
1152         if (dev->flags & IFF_UP)
1153                 return -EBUSY;          /* PVC in use */
1154
1155         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1156         *get_dev_p(pvc, type) = NULL;
1157
1158         if (!pvc_is_used(pvc)) {
1159                 state(hdlc)->dce_pvc_count--;
1160                 state(hdlc)->dce_changed = 1;
1161         }
1162         delete_unused_pvcs(hdlc);
1163         return 0;
1164 }
1165
1166
1167
1168 static void fr_destroy(struct net_device *frad)
1169 {
1170         hdlc_device *hdlc = dev_to_hdlc(frad);
1171         pvc_device *pvc = state(hdlc)->first_pvc;
1172         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1173         state(hdlc)->dce_pvc_count = 0;
1174         state(hdlc)->dce_changed = 1;
1175
1176         while (pvc) {
1177                 pvc_device *next = pvc->next;
1178                 /* destructors will free_netdev() main and ether */
1179                 if (pvc->main)
1180                         unregister_netdevice(pvc->main);
1181
1182                 if (pvc->ether)
1183                         unregister_netdevice(pvc->ether);
1184
1185                 kfree(pvc);
1186                 pvc = next;
1187         }
1188 }
1189
1190
1191 static struct hdlc_proto proto = {
1192         .close          = fr_close,
1193         .start          = fr_start,
1194         .stop           = fr_stop,
1195         .detach         = fr_destroy,
1196         .ioctl          = fr_ioctl,
1197         .netif_rx       = fr_rx,
1198         .module         = THIS_MODULE,
1199 };
1200
1201
1202 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1203 {
1204         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1205         const size_t size = sizeof(fr_proto);
1206         fr_proto new_settings;
1207         hdlc_device *hdlc = dev_to_hdlc(dev);
1208         fr_proto_pvc pvc;
1209         int result;
1210
1211         switch (ifr->ifr_settings.type) {
1212         case IF_GET_PROTO:
1213                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1214                         return -EINVAL;
1215                 ifr->ifr_settings.type = IF_PROTO_FR;
1216                 if (ifr->ifr_settings.size < size) {
1217                         ifr->ifr_settings.size = size; /* data size wanted */
1218                         return -ENOBUFS;
1219                 }
1220                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1221                         return -EFAULT;
1222                 return 0;
1223
1224         case IF_PROTO_FR:
1225                 if(!capable(CAP_NET_ADMIN))
1226                         return -EPERM;
1227
1228                 if(dev->flags & IFF_UP)
1229                         return -EBUSY;
1230
1231                 if (copy_from_user(&new_settings, fr_s, size))
1232                         return -EFAULT;
1233
1234                 if (new_settings.lmi == LMI_DEFAULT)
1235                         new_settings.lmi = LMI_ANSI;
1236
1237                 if ((new_settings.lmi != LMI_NONE &&
1238                      new_settings.lmi != LMI_ANSI &&
1239                      new_settings.lmi != LMI_CCITT &&
1240                      new_settings.lmi != LMI_CISCO) ||
1241                     new_settings.t391 < 1 ||
1242                     new_settings.t392 < 2 ||
1243                     new_settings.n391 < 1 ||
1244                     new_settings.n392 < 1 ||
1245                     new_settings.n393 < new_settings.n392 ||
1246                     new_settings.n393 > 32 ||
1247                     (new_settings.dce != 0 &&
1248                      new_settings.dce != 1))
1249                         return -EINVAL;
1250
1251                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1252                 if (result)
1253                         return result;
1254
1255                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1256                         result = attach_hdlc_protocol(dev, &proto,
1257                                                       sizeof(struct frad_state));
1258                         if (result)
1259                                 return result;
1260                         state(hdlc)->first_pvc = NULL;
1261                         state(hdlc)->dce_pvc_count = 0;
1262                 }
1263                 memcpy(&state(hdlc)->settings, &new_settings, size);
1264
1265                 dev->hard_start_xmit = hdlc->xmit;
1266                 dev->type = ARPHRD_FRAD;
1267                 return 0;
1268
1269         case IF_PROTO_FR_ADD_PVC:
1270         case IF_PROTO_FR_DEL_PVC:
1271         case IF_PROTO_FR_ADD_ETH_PVC:
1272         case IF_PROTO_FR_DEL_ETH_PVC:
1273                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1274                         return -EINVAL;
1275
1276                 if(!capable(CAP_NET_ADMIN))
1277                         return -EPERM;
1278
1279                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1280                                    sizeof(fr_proto_pvc)))
1281                         return -EFAULT;
1282
1283                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1284                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1285
1286                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1287                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1288                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1289                 else
1290                         result = ARPHRD_DLCI;
1291
1292                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1293                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1294                         return fr_add_pvc(dev, pvc.dlci, result);
1295                 else
1296                         return fr_del_pvc(hdlc, pvc.dlci, result);
1297         }
1298
1299         return -EINVAL;
1300 }
1301
1302
1303 static int __init mod_init(void)
1304 {
1305         register_hdlc_protocol(&proto);
1306         return 0;
1307 }
1308
1309
1310 static void __exit mod_exit(void)
1311 {
1312         unregister_hdlc_protocol(&proto);
1313 }
1314
1315
1316 module_init(mod_init);
1317 module_exit(mod_exit);
1318
1319 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1320 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1321 MODULE_LICENSE("GPL v2");