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 pvc_desc {
 139         struct net_device_stats stats;
 140         pvc_device *pvc;
 141 };
 142
 143 struct frad_state {
 144         fr_proto settings;
 145         pvc_device *first_pvc;
 146         int dce_pvc_count;
 147
 148         struct timer_list timer;
 149         unsigned long last_poll;
 150         int reliable;
 151         int dce_changed;
 152         int request;
 153         int fullrep_sent;
 154         u32 last_errors; /* last errors bit list */
 155         u8 n391cnt;
 156         u8 txseq; /* TX sequence number */
 157         u8 rxseq; /* RX sequence number */
 158 };
 159
 160
 161 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 162
 163
 164 static inline u16 q922_to_dlci(u8 *hdr)
 165 {
 166         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 167 }
 168
 169
 170 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 171 {
 172         hdr[0] = (dlci >> 2) & 0xFC;
 173         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 174 }
 175
 176
 177 static inline struct frad_state* state(hdlc_device *hdlc)
 178 {
 179         return(struct frad_state *)(hdlc->state);
 180 }
 181
 182 static inline struct pvc_desc* pvcdev_to_desc(struct net_device *dev)
 183 {
 184         return dev->priv;
 185 }
 186
 187 static inline struct net_device_stats* pvc_get_stats(struct net_device *dev)
 188 {
 189         return &pvcdev_to_desc(dev)->stats;
 190 }
 191
 192 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
 193 {
 194         pvc_device *pvc = state(hdlc)->first_pvc;
 195
 196         while (pvc) {
 197                 if (pvc->dlci == dlci)
 198                         return pvc;
 199                 if (pvc->dlci > dlci)
 200                         return NULL; /* the listed is sorted */
 201                 pvc = pvc->next;
 202         }
 203
 204         return NULL;
 205 }
 206
 207
 208 static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
 209 {
 210         hdlc_device *hdlc = dev_to_hdlc(dev);
 211         pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 212
 213         while (*pvc_p) {
 214                 if ((*pvc_p)->dlci == dlci)
 215                         return *pvc_p;
 216                 if ((*pvc_p)->dlci > dlci)
 217                         break;  /* the list is sorted */
 218                 pvc_p = &(*pvc_p)->next;
 219         }
 220
 221         pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC);
 222 #ifdef DEBUG_PVC
 223         printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
 224 #endif
 225         if (!pvc)
 226                 return NULL;
 227
 228         pvc->dlci = dlci;
 229         pvc->frad = dev;
 230         pvc->next = *pvc_p;     /* Put it in the chain */
 231         *pvc_p = pvc;
 232         return pvc;
 233 }
 234
 235
 236 static inline int pvc_is_used(pvc_device *pvc)
 237 {
 238         return pvc->main || pvc->ether;
 239 }
 240
 241
 242 static inline void pvc_carrier(int on, pvc_device *pvc)
 243 {
 244         if (on) {
 245                 if (pvc->main)
 246                         if (!netif_carrier_ok(pvc->main))
 247                                 netif_carrier_on(pvc->main);
 248                 if (pvc->ether)
 249                         if (!netif_carrier_ok(pvc->ether))
 250                                 netif_carrier_on(pvc->ether);
 251         } else {
 252                 if (pvc->main)
 253                         if (netif_carrier_ok(pvc->main))
 254                                 netif_carrier_off(pvc->main);
 255                 if (pvc->ether)
 256                         if (netif_carrier_ok(pvc->ether))
 257                                 netif_carrier_off(pvc->ether);
 258         }
 259 }
 260
 261
 262 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 263 {
 264         pvc_device **pvc_p = &state(hdlc)->first_pvc;
 265
 266         while (*pvc_p) {
 267                 if (!pvc_is_used(*pvc_p)) {
 268                         pvc_device *pvc = *pvc_p;
 269 #ifdef DEBUG_PVC
 270                         printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
 271 #endif
 272                         *pvc_p = pvc->next;
 273                         kfree(pvc);
 274                         continue;
 275                 }
 276                 pvc_p = &(*pvc_p)->next;
 277         }
 278 }
 279
 280
 281 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
 282 {
 283         if (type == ARPHRD_ETHER)
 284                 return &pvc->ether;
 285         else
 286                 return &pvc->main;
 287 }
 288
 289
 290 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 291 {
 292         u16 head_len;
 293         struct sk_buff *skb = *skb_p;
 294
 295         switch (skb->protocol) {
 296         case __constant_htons(NLPID_CCITT_ANSI_LMI):
 297                 head_len = 4;
 298                 skb_push(skb, head_len);
 299                 skb->data[3] = NLPID_CCITT_ANSI_LMI;
 300                 break;
 301
 302         case __constant_htons(NLPID_CISCO_LMI):
 303                 head_len = 4;
 304                 skb_push(skb, head_len);
 305                 skb->data[3] = NLPID_CISCO_LMI;
 306                 break;
 307
 308         case __constant_htons(ETH_P_IP):
 309                 head_len = 4;
 310                 skb_push(skb, head_len);
 311                 skb->data[3] = NLPID_IP;
 312                 break;
 313
 314         case __constant_htons(ETH_P_IPV6):
 315                 head_len = 4;
 316                 skb_push(skb, head_len);
 317                 skb->data[3] = NLPID_IPV6;
 318                 break;
 319
 320         case __constant_htons(ETH_P_802_3):
 321                 head_len = 10;
 322                 if (skb_headroom(skb) < head_len) {
 323                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 324                                                                     head_len);
 325                         if (!skb2)
 326                                 return -ENOBUFS;
 327                         dev_kfree_skb(skb);
 328                         skb = *skb_p = skb2;
 329                 }
 330                 skb_push(skb, head_len);
 331                 skb->data[3] = FR_PAD;
 332                 skb->data[4] = NLPID_SNAP;
 333                 skb->data[5] = FR_PAD;
 334                 skb->data[6] = 0x80;
 335                 skb->data[7] = 0xC2;
 336                 skb->data[8] = 0x00;
 337                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 338                 break;
 339
 340         default:
 341                 head_len = 10;
 342                 skb_push(skb, head_len);
 343                 skb->data[3] = FR_PAD;
 344                 skb->data[4] = NLPID_SNAP;
 345                 skb->data[5] = FR_PAD;
 346                 skb->data[6] = FR_PAD;
 347                 skb->data[7] = FR_PAD;
 348                 *(__be16*)(skb->data + 8) = skb->protocol;
 349         }
 350
 351         dlci_to_q922(skb->data, dlci);
 352         skb->data[2] = FR_UI;
 353         return 0;
 354 }
 355
 356
 357
 358 static int pvc_open(struct net_device *dev)
 359 {
 360         pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
 361
 362         if ((pvc->frad->flags & IFF_UP) == 0)
 363                 return -EIO;  /* Frad must be UP in order to activate PVC */
 364
 365         if (pvc->open_count++ == 0) {
 366                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 367                 if (state(hdlc)->settings.lmi == LMI_NONE)
 368                         pvc->state.active = netif_carrier_ok(pvc->frad);
 369
 370                 pvc_carrier(pvc->state.active, pvc);
 371                 state(hdlc)->dce_changed = 1;
 372         }
 373         return 0;
 374 }
 375
 376
 377
 378 static int pvc_close(struct net_device *dev)
 379 {
 380         pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
 381
 382         if (--pvc->open_count == 0) {
 383                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 384                 if (state(hdlc)->settings.lmi == LMI_NONE)
 385                         pvc->state.active = 0;
 386
 387                 if (state(hdlc)->settings.dce) {
 388                         state(hdlc)->dce_changed = 1;
 389                         pvc->state.active = 0;
 390                 }
 391         }
 392         return 0;
 393 }
 394
 395
 396
 397 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 398 {
 399         pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
 400         fr_proto_pvc_info info;
 401
 402         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 403                 if (dev->type == ARPHRD_ETHER)
 404                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 405                 else
 406                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 407
 408                 if (ifr->ifr_settings.size < sizeof(info)) {
 409                         /* data size wanted */
 410                         ifr->ifr_settings.size = sizeof(info);
 411                         return -ENOBUFS;
 412                 }
 413
 414                 info.dlci = pvc->dlci;
 415                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 416                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 417                                  &info, sizeof(info)))
 418                         return -EFAULT;
 419                 return 0;
 420         }
 421
 422         return -EINVAL;
 423 }
 424
 425 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 426 {
 427         pvc_device *pvc = pvcdev_to_desc(dev)->pvc;
 428         struct net_device_stats *stats = pvc_get_stats(dev);
 429
 430         if (pvc->state.active) {
 431                 if (dev->type == ARPHRD_ETHER) {
 432                         int pad = ETH_ZLEN - skb->len;
 433                         if (pad > 0) { /* Pad the frame with zeros */
 434                                 int len = skb->len;
 435                                 if (skb_tailroom(skb) < pad)
 436                                         if (pskb_expand_head(skb, 0, pad,
 437                                                              GFP_ATOMIC)) {
 438                                                 stats->tx_dropped++;
 439                                                 dev_kfree_skb(skb);
 440                                                 return 0;
 441                                         }
 442                                 skb_put(skb, pad);
 443                                 memset(skb->data + len, 0, pad);
 444                         }
 445                         skb->protocol = __constant_htons(ETH_P_802_3);
 446                 }
 447                 if (!fr_hard_header(&skb, pvc->dlci)) {
 448                         stats->tx_bytes += skb->len;
 449                         stats->tx_packets++;
 450                         if (pvc->state.fecn) /* TX Congestion counter */
 451                                 stats->tx_compressed++;
 452                         skb->dev = pvc->frad;
 453                         dev_queue_xmit(skb);
 454                         return 0;
 455                 }
 456         }
 457
 458         stats->tx_dropped++;
 459         dev_kfree_skb(skb);
 460         return 0;
 461 }
 462
 463
 464
 465 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
 466 {
 467         if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
 468                 return -EINVAL;
 469         dev->mtu = new_mtu;
 470         return 0;
 471 }
 472
 473
 474
 475 static inline void fr_log_dlci_active(pvc_device *pvc)
 476 {
 477         printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
 478                pvc->frad->name,
 479                pvc->dlci,
 480                pvc->main ? pvc->main->name : "",
 481                pvc->main && pvc->ether ? " " : "",
 482                pvc->ether ? pvc->ether->name : "",
 483                pvc->state.new ? " new" : "",
 484                !pvc->state.exist ? "deleted" :
 485                pvc->state.active ? "active" : "inactive");
 486 }
 487
 488
 489
 490 static inline u8 fr_lmi_nextseq(u8 x)
 491 {
 492         x++;
 493         return x ? x : 1;
 494 }
 495
 496
 497 static void fr_lmi_send(struct net_device *dev, int fullrep)
 498 {
 499         hdlc_device *hdlc = dev_to_hdlc(dev);
 500         struct sk_buff *skb;
 501         pvc_device *pvc = state(hdlc)->first_pvc;
 502         int lmi = state(hdlc)->settings.lmi;
 503         int dce = state(hdlc)->settings.dce;
 504         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 505         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 506         u8 *data;
 507         int i = 0;
 508
 509         if (dce && fullrep) {
 510                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 511                 if (len > HDLC_MAX_MRU) {
 512                         printk(KERN_WARNING "%s: Too many PVCs while sending "
 513                                "LMI full report\n", dev->name);
 514                         return;
 515                 }
 516         }
 517
 518         skb = dev_alloc_skb(len);
 519         if (!skb) {
 520                 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
 521                        dev->name);
 522                 return;
 523         }
 524         memset(skb->data, 0, len);
 525         skb_reserve(skb, 4);
 526         if (lmi == LMI_CISCO) {
 527                 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
 528                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 529         } else {
 530                 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
 531                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 532         }
 533         data = skb_tail_pointer(skb);
 534         data[i++] = LMI_CALLREF;
 535         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 536         if (lmi == LMI_ANSI)
 537                 data[i++] = LMI_ANSI_LOCKSHIFT;
 538         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 539                 LMI_ANSI_CISCO_REPTYPE;
 540         data[i++] = LMI_REPT_LEN;
 541         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 542         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 543         data[i++] = LMI_INTEG_LEN;
 544         data[i++] = state(hdlc)->txseq =
 545                 fr_lmi_nextseq(state(hdlc)->txseq);
 546         data[i++] = state(hdlc)->rxseq;
 547
 548         if (dce && fullrep) {
 549                 while (pvc) {
 550                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 551                                 LMI_ANSI_CISCO_PVCSTAT;
 552                         data[i++] = stat_len;
 553
 554                         /* LMI start/restart */
 555                         if (state(hdlc)->reliable && !pvc->state.exist) {
 556                                 pvc->state.exist = pvc->state.new = 1;
 557                                 fr_log_dlci_active(pvc);
 558                         }
 559
 560                         /* ifconfig PVC up */
 561                         if (pvc->open_count && !pvc->state.active &&
 562                             pvc->state.exist && !pvc->state.new) {
 563                                 pvc_carrier(1, pvc);
 564                                 pvc->state.active = 1;
 565                                 fr_log_dlci_active(pvc);
 566                         }
 567
 568                         if (lmi == LMI_CISCO) {
 569                                 data[i] = pvc->dlci >> 8;
 570                                 data[i + 1] = pvc->dlci & 0xFF;
 571                         } else {
 572                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 573                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 574                                 data[i + 2] = 0x80;
 575                         }
 576
 577                         if (pvc->state.new)
 578                                 data[i + 2] |= 0x08;
 579                         else if (pvc->state.active)
 580                                 data[i + 2] |= 0x02;
 581
 582                         i += stat_len;
 583                         pvc = pvc->next;
 584                 }
 585         }
 586
 587         skb_put(skb, i);
 588         skb->priority = TC_PRIO_CONTROL;
 589         skb->dev = dev;
 590         skb_reset_network_header(skb);
 591
 592         dev_queue_xmit(skb);
 593 }
 594
 595
 596
 597 static void fr_set_link_state(int reliable, struct net_device *dev)
 598 {
 599         hdlc_device *hdlc = dev_to_hdlc(dev);
 600         pvc_device *pvc = state(hdlc)->first_pvc;
 601
 602         state(hdlc)->reliable = reliable;
 603         if (reliable) {
 604                 netif_dormant_off(dev);
 605                 state(hdlc)->n391cnt = 0; /* Request full status */
 606                 state(hdlc)->dce_changed = 1;
 607
 608                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 609                         while (pvc) {   /* Activate all PVCs */
 610                                 pvc_carrier(1, pvc);
 611                                 pvc->state.exist = pvc->state.active = 1;
 612                                 pvc->state.new = 0;
 613                                 pvc = pvc->next;
 614                         }
 615                 }
 616         } else {
 617                 netif_dormant_on(dev);
 618                 while (pvc) {           /* Deactivate all PVCs */
 619                         pvc_carrier(0, pvc);
 620                         pvc->state.exist = pvc->state.active = 0;
 621                         pvc->state.new = 0;
 622                         if (!state(hdlc)->settings.dce)
 623                                 pvc->state.bandwidth = 0;
 624                         pvc = pvc->next;
 625                 }
 626         }
 627 }
 628
 629
 630 static void fr_timer(unsigned long arg)
 631 {
 632         struct net_device *dev = (struct net_device *)arg;
 633         hdlc_device *hdlc = dev_to_hdlc(dev);
 634         int i, cnt = 0, reliable;
 635         u32 list;
 636
 637         if (state(hdlc)->settings.dce) {
 638                 reliable = state(hdlc)->request &&
 639                         time_before(jiffies, state(hdlc)->last_poll +
 640                                     state(hdlc)->settings.t392 * HZ);
 641                 state(hdlc)->request = 0;
 642         } else {
 643                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 644                 if (state(hdlc)->request) {
 645                         if (state(hdlc)->reliable)
 646                                 printk(KERN_INFO "%s: No LMI status reply "
 647                                        "received\n", dev->name);
 648                         state(hdlc)->last_errors |= 1;
 649                 }
 650
 651                 list = state(hdlc)->last_errors;
 652                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 653                         cnt += (list & 1);      /* errors count */
 654
 655                 reliable = (cnt < state(hdlc)->settings.n392);
 656         }
 657
 658         if (state(hdlc)->reliable != reliable) {
 659                 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
 660                        reliable ? "" : "un");
 661                 fr_set_link_state(reliable, dev);
 662         }
 663
 664         if (state(hdlc)->settings.dce)
 665                 state(hdlc)->timer.expires = jiffies +
 666                         state(hdlc)->settings.t392 * HZ;
 667         else {
 668                 if (state(hdlc)->n391cnt)
 669                         state(hdlc)->n391cnt--;
 670
 671                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 672
 673                 state(hdlc)->last_poll = jiffies;
 674                 state(hdlc)->request = 1;
 675                 state(hdlc)->timer.expires = jiffies +
 676                         state(hdlc)->settings.t391 * HZ;
 677         }
 678
 679         state(hdlc)->timer.function = fr_timer;
 680         state(hdlc)->timer.data = arg;
 681         add_timer(&state(hdlc)->timer);
 682 }
 683
 684
 685 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 686 {
 687         hdlc_device *hdlc = dev_to_hdlc(dev);
 688         pvc_device *pvc;
 689         u8 rxseq, txseq;
 690         int lmi = state(hdlc)->settings.lmi;
 691         int dce = state(hdlc)->settings.dce;
 692         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 693
 694         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 695                         LMI_CCITT_CISCO_LENGTH)) {
 696                 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
 697                 return 1;
 698         }
 699
 700         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 701                              NLPID_CCITT_ANSI_LMI)) {
 702                 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
 703                        dev->name);
 704                 return 1;
 705         }
 706
 707         if (skb->data[4] != LMI_CALLREF) {
 708                 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
 709                        dev->name, skb->data[4]);
 710                 return 1;
 711         }
 712
 713         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 714                 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
 715                        dev->name, skb->data[5]);
 716                 return 1;
 717         }
 718
 719         if (lmi == LMI_ANSI) {
 720                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 721                         printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
 722                                " message (0x%02X)\n", dev->name, skb->data[6]);
 723                         return 1;
 724                 }
 725                 i = 7;
 726         } else
 727                 i = 6;
 728
 729         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 730                              LMI_ANSI_CISCO_REPTYPE)) {
 731                 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
 732                        dev->name, skb->data[i]);
 733                 return 1;
 734         }
 735
 736         if (skb->data[++i] != LMI_REPT_LEN) {
 737                 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
 738                        " (%u)\n", dev->name, skb->data[i]);
 739                 return 1;
 740         }
 741
 742         reptype = skb->data[++i];
 743         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 744                 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
 745                        dev->name, reptype);
 746                 return 1;
 747         }
 748
 749         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 750                                LMI_ANSI_CISCO_ALIVE)) {
 751                 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
 752                        " IE (0x%02X)\n", dev->name, skb->data[i]);
 753                 return 1;
 754         }
 755
 756         if (skb->data[++i] != LMI_INTEG_LEN) {
 757                 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
 758                        " IE length (%u)\n", dev->name, skb->data[i]);
 759                 return 1;
 760         }
 761         i++;
 762
 763         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 764         rxseq = skb->data[i++]; /* Should confirm our sequence */
 765
 766         txseq = state(hdlc)->txseq;
 767
 768         if (dce)
 769                 state(hdlc)->last_poll = jiffies;
 770
 771         error = 0;
 772         if (!state(hdlc)->reliable)
 773                 error = 1;
 774
 775         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 776                 state(hdlc)->n391cnt = 0;
 777                 error = 1;
 778         }
 779
 780         if (dce) {
 781                 if (state(hdlc)->fullrep_sent && !error) {
 782 /* Stop sending full report - the last one has been confirmed by DTE */
 783                         state(hdlc)->fullrep_sent = 0;
 784                         pvc = state(hdlc)->first_pvc;
 785                         while (pvc) {
 786                                 if (pvc->state.new) {
 787                                         pvc->state.new = 0;
 788
 789 /* Tell DTE that new PVC is now active */
 790                                         state(hdlc)->dce_changed = 1;
 791                                 }
 792                                 pvc = pvc->next;
 793                         }
 794                 }
 795
 796                 if (state(hdlc)->dce_changed) {
 797                         reptype = LMI_FULLREP;
 798                         state(hdlc)->fullrep_sent = 1;
 799                         state(hdlc)->dce_changed = 0;
 800                 }
 801
 802                 state(hdlc)->request = 1; /* got request */
 803                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 804                 return 0;
 805         }
 806
 807         /* DTE */
 808
 809         state(hdlc)->request = 0; /* got response, no request pending */
 810
 811         if (error)
 812                 return 0;
 813
 814         if (reptype != LMI_FULLREP)
 815                 return 0;
 816
 817         pvc = state(hdlc)->first_pvc;
 818
 819         while (pvc) {
 820                 pvc->state.deleted = 1;
 821                 pvc = pvc->next;
 822         }
 823
 824         no_ram = 0;
 825         while (skb->len >= i + 2 + stat_len) {
 826                 u16 dlci;
 827                 u32 bw;
 828                 unsigned int active, new;
 829
 830                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 831                                        LMI_ANSI_CISCO_PVCSTAT)) {
 832                         printk(KERN_INFO "%s: Not an LMI PVC status IE"
 833                                " (0x%02X)\n", dev->name, skb->data[i]);
 834                         return 1;
 835                 }
 836
 837                 if (skb->data[++i] != stat_len) {
 838                         printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
 839                                " (%u)\n", dev->name, skb->data[i]);
 840                         return 1;
 841                 }
 842                 i++;
 843
 844                 new = !! (skb->data[i + 2] & 0x08);
 845                 active = !! (skb->data[i + 2] & 0x02);
 846                 if (lmi == LMI_CISCO) {
 847                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 848                         bw = (skb->data[i + 3] << 16) |
 849                                 (skb->data[i + 4] << 8) |
 850                                 (skb->data[i + 5]);
 851                 } else {
 852                         dlci = ((skb->data[i] & 0x3F) << 4) |
 853                                 ((skb->data[i + 1] & 0x78) >> 3);
 854                         bw = 0;
 855                 }
 856
 857                 pvc = add_pvc(dev, dlci);
 858
 859                 if (!pvc && !no_ram) {
 860                         printk(KERN_WARNING
 861                                "%s: Memory squeeze on fr_lmi_recv()\n",
 862                                dev->name);
 863                         no_ram = 1;
 864                 }
 865
 866                 if (pvc) {
 867                         pvc->state.exist = 1;
 868                         pvc->state.deleted = 0;
 869                         if (active != pvc->state.active ||
 870                             new != pvc->state.new ||
 871                             bw != pvc->state.bandwidth ||
 872                             !pvc->state.exist) {
 873                                 pvc->state.new = new;
 874                                 pvc->state.active = active;
 875                                 pvc->state.bandwidth = bw;
 876                                 pvc_carrier(active, pvc);
 877                                 fr_log_dlci_active(pvc);
 878                         }
 879                 }
 880
 881                 i += stat_len;
 882         }
 883
 884         pvc = state(hdlc)->first_pvc;
 885
 886         while (pvc) {
 887                 if (pvc->state.deleted && pvc->state.exist) {
 888                         pvc_carrier(0, pvc);
 889                         pvc->state.active = pvc->state.new = 0;
 890                         pvc->state.exist = 0;
 891                         pvc->state.bandwidth = 0;
 892                         fr_log_dlci_active(pvc);
 893                 }
 894                 pvc = pvc->next;
 895         }
 896
 897         /* Next full report after N391 polls */
 898         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 899
 900         return 0;
 901 }
 902
 903
 904 static int fr_rx(struct sk_buff *skb)
 905 {
 906         struct net_device *frad = skb->dev;
 907         hdlc_device *hdlc = dev_to_hdlc(frad);
 908         fr_hdr *fh = (fr_hdr*)skb->data;
 909         u8 *data = skb->data;
 910         u16 dlci;
 911         pvc_device *pvc;
 912         struct net_device *dev = NULL;
 913
 914         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 915                 goto rx_error;
 916
 917         dlci = q922_to_dlci(skb->data);
 918
 919         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 920              (state(hdlc)->settings.lmi == LMI_ANSI ||
 921               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 922             (dlci == LMI_CISCO_DLCI &&
 923              state(hdlc)->settings.lmi == LMI_CISCO)) {
 924                 if (fr_lmi_recv(frad, skb))
 925                         goto rx_error;
 926                 dev_kfree_skb_any(skb);
 927                 return NET_RX_SUCCESS;
 928         }
 929
 930         pvc = find_pvc(hdlc, dlci);
 931         if (!pvc) {
 932 #ifdef DEBUG_PKT
 933                 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
 934                        frad->name, dlci);
 935 #endif
 936                 dev_kfree_skb_any(skb);
 937                 return NET_RX_DROP;
 938         }
 939
 940         if (pvc->state.fecn != fh->fecn) {
 941 #ifdef DEBUG_ECN
 942                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 943                        dlci, fh->fecn ? "N" : "FF");
 944 #endif
 945                 pvc->state.fecn ^= 1;
 946         }
 947
 948         if (pvc->state.becn != fh->becn) {
 949 #ifdef DEBUG_ECN
 950                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 951                        dlci, fh->becn ? "N" : "FF");
 952 #endif
 953                 pvc->state.becn ^= 1;
 954         }
 955
 956
 957         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 958                 dev_to_hdlc(frad)->stats.rx_dropped++;
 959                 return NET_RX_DROP;
 960         }
 961
 962         if (data[3] == NLPID_IP) {
 963                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 964                 dev = pvc->main;
 965                 skb->protocol = htons(ETH_P_IP);
 966
 967         } else if (data[3] == NLPID_IPV6) {
 968                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 969                 dev = pvc->main;
 970                 skb->protocol = htons(ETH_P_IPV6);
 971
 972         } else if (skb->len > 10 && data[3] == FR_PAD &&
 973                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 974                 u16 oui = ntohs(*(__be16*)(data + 6));
 975                 u16 pid = ntohs(*(__be16*)(data + 8));
 976                 skb_pull(skb, 10);
 977
 978                 switch ((((u32)oui) << 16) | pid) {
 979                 case ETH_P_ARP: /* routed frame with SNAP */
 980                 case ETH_P_IPX:
 981                 case ETH_P_IP:  /* a long variant */
 982                 case ETH_P_IPV6:
 983                         dev = pvc->main;
 984                         skb->protocol = htons(pid);
 985                         break;
 986
 987                 case 0x80C20007: /* bridged Ethernet frame */
 988                         if ((dev = pvc->ether) != NULL)
 989                                 skb->protocol = eth_type_trans(skb, dev);
 990                         break;
 991
 992                 default:
 993                         printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
 994                                "PID=%x\n", frad->name, oui, pid);
 995                         dev_kfree_skb_any(skb);
 996                         return NET_RX_DROP;
 997                 }
 998         } else {
 999                 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
1000                        "length = %i\n", frad->name, data[3], skb->len);
1001                 dev_kfree_skb_any(skb);
1002                 return NET_RX_DROP;
1003         }
1004
1005         if (dev) {
1006                 struct net_device_stats *stats = pvc_get_stats(dev);
1007                 stats->rx_packets++; /* PVC traffic */
1008                 stats->rx_bytes += skb->len;
1009                 if (pvc->state.becn)
1010                         stats->rx_compressed++;
1011                 netif_rx(skb);
1012                 return NET_RX_SUCCESS;
1013         } else {
1014                 dev_kfree_skb_any(skb);
1015                 return NET_RX_DROP;
1016         }
1017
1018  rx_error:
1019         dev_to_hdlc(frad)->stats.rx_errors++; /* Mark error */
1020         dev_kfree_skb_any(skb);
1021         return NET_RX_DROP;
1022 }
1023
1024
1025
1026 static void fr_start(struct net_device *dev)
1027 {
1028         hdlc_device *hdlc = dev_to_hdlc(dev);
1029 #ifdef DEBUG_LINK
1030         printk(KERN_DEBUG "fr_start\n");
1031 #endif
1032         if (state(hdlc)->settings.lmi != LMI_NONE) {
1033                 state(hdlc)->reliable = 0;
1034                 state(hdlc)->dce_changed = 1;
1035                 state(hdlc)->request = 0;
1036                 state(hdlc)->fullrep_sent = 0;
1037                 state(hdlc)->last_errors = 0xFFFFFFFF;
1038                 state(hdlc)->n391cnt = 0;
1039                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1040
1041                 init_timer(&state(hdlc)->timer);
1042                 /* First poll after 1 s */
1043                 state(hdlc)->timer.expires = jiffies + HZ;
1044                 state(hdlc)->timer.function = fr_timer;
1045                 state(hdlc)->timer.data = (unsigned long)dev;
1046                 add_timer(&state(hdlc)->timer);
1047         } else
1048                 fr_set_link_state(1, dev);
1049 }
1050
1051
1052 static void fr_stop(struct net_device *dev)
1053 {
1054         hdlc_device *hdlc = dev_to_hdlc(dev);
1055 #ifdef DEBUG_LINK
1056         printk(KERN_DEBUG "fr_stop\n");
1057 #endif
1058         if (state(hdlc)->settings.lmi != LMI_NONE)
1059                 del_timer_sync(&state(hdlc)->timer);
1060         fr_set_link_state(0, dev);
1061 }
1062
1063
1064 static void fr_close(struct net_device *dev)
1065 {
1066         hdlc_device *hdlc = dev_to_hdlc(dev);
1067         pvc_device *pvc = state(hdlc)->first_pvc;
1068
1069         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1070                 if (pvc->main)
1071                         dev_close(pvc->main);
1072                 if (pvc->ether)
1073                         dev_close(pvc->ether);
1074                 pvc = pvc->next;
1075         }
1076 }
1077
1078
1079 static void pvc_setup(struct net_device *dev)
1080 {
1081         dev->type = ARPHRD_DLCI;
1082         dev->flags = IFF_POINTOPOINT;
1083         dev->hard_header_len = 10;
1084         dev->addr_len = 2;
1085 }
1086
1087 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1088 {
1089         hdlc_device *hdlc = dev_to_hdlc(frad);
1090         pvc_device *pvc = NULL;
1091         struct net_device *dev;
1092         int result, used;
1093         char * prefix = "pvc%d";
1094
1095         if (type == ARPHRD_ETHER)
1096                 prefix = "pvceth%d";
1097
1098         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1099                 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1100                        frad->name);
1101                 return -ENOBUFS;
1102         }
1103
1104         if (*get_dev_p(pvc, type))
1105                 return -EEXIST;
1106
1107         used = pvc_is_used(pvc);
1108
1109         if (type == ARPHRD_ETHER)
1110                 dev = alloc_netdev(sizeof(struct pvc_desc), "pvceth%d",
1111                                    ether_setup);
1112         else
1113                 dev = alloc_netdev(sizeof(struct pvc_desc), "pvc%d", pvc_setup);
1114
1115         if (!dev) {
1116                 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1117                        frad->name);
1118                 delete_unused_pvcs(hdlc);
1119                 return -ENOBUFS;
1120         }
1121
1122         if (type == ARPHRD_ETHER)
1123                 random_ether_addr(dev->dev_addr);
1124         else {
1125                 *(__be16*)dev->dev_addr = htons(dlci);
1126                 dlci_to_q922(dev->broadcast, dlci);
1127         }
1128         dev->hard_start_xmit = pvc_xmit;
1129         dev->get_stats = pvc_get_stats;
1130         dev->open = pvc_open;
1131         dev->stop = pvc_close;
1132         dev->do_ioctl = pvc_ioctl;
1133         dev->change_mtu = pvc_change_mtu;
1134         dev->mtu = HDLC_MAX_MTU;
1135         dev->tx_queue_len = 0;
1136         pvcdev_to_desc(dev)->pvc = pvc;
1137
1138         result = dev_alloc_name(dev, dev->name);
1139         if (result < 0) {
1140                 free_netdev(dev);
1141                 delete_unused_pvcs(hdlc);
1142                 return result;
1143         }
1144
1145         if (register_netdevice(dev) != 0) {
1146                 free_netdev(dev);
1147                 delete_unused_pvcs(hdlc);
1148                 return -EIO;
1149         }
1150
1151         dev->destructor = free_netdev;
1152         *get_dev_p(pvc, type) = dev;
1153         if (!used) {
1154                 state(hdlc)->dce_changed = 1;
1155                 state(hdlc)->dce_pvc_count++;
1156         }
1157         return 0;
1158 }
1159
1160
1161
1162 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1163 {
1164         pvc_device *pvc;
1165         struct net_device *dev;
1166
1167         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1168                 return -ENOENT;
1169
1170         if ((dev = *get_dev_p(pvc, type)) == NULL)
1171                 return -ENOENT;
1172
1173         if (dev->flags & IFF_UP)
1174                 return -EBUSY;          /* PVC in use */
1175
1176         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1177         *get_dev_p(pvc, type) = NULL;
1178
1179         if (!pvc_is_used(pvc)) {
1180                 state(hdlc)->dce_pvc_count--;
1181                 state(hdlc)->dce_changed = 1;
1182         }
1183         delete_unused_pvcs(hdlc);
1184         return 0;
1185 }
1186
1187
1188
1189 static void fr_destroy(struct net_device *frad)
1190 {
1191         hdlc_device *hdlc = dev_to_hdlc(frad);
1192         pvc_device *pvc = state(hdlc)->first_pvc;
1193         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1194         state(hdlc)->dce_pvc_count = 0;
1195         state(hdlc)->dce_changed = 1;
1196
1197         while (pvc) {
1198                 pvc_device *next = pvc->next;
1199                 /* destructors will free_netdev() main and ether */
1200                 if (pvc->main)
1201                         unregister_netdevice(pvc->main);
1202
1203                 if (pvc->ether)
1204                         unregister_netdevice(pvc->ether);
1205
1206                 kfree(pvc);
1207                 pvc = next;
1208         }
1209 }
1210
1211
1212 static struct hdlc_proto proto = {
1213         .close          = fr_close,
1214         .start          = fr_start,
1215         .stop           = fr_stop,
1216         .detach         = fr_destroy,
1217         .ioctl          = fr_ioctl,
1218         .netif_rx       = fr_rx,
1219         .module         = THIS_MODULE,
1220 };
1221
1222
1223 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1224 {
1225         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1226         const size_t size = sizeof(fr_proto);
1227         fr_proto new_settings;
1228         hdlc_device *hdlc = dev_to_hdlc(dev);
1229         fr_proto_pvc pvc;
1230         int result;
1231
1232         switch (ifr->ifr_settings.type) {
1233         case IF_GET_PROTO:
1234                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1235                         return -EINVAL;
1236                 ifr->ifr_settings.type = IF_PROTO_FR;
1237                 if (ifr->ifr_settings.size < size) {
1238                         ifr->ifr_settings.size = size; /* data size wanted */
1239                         return -ENOBUFS;
1240                 }
1241                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1242                         return -EFAULT;
1243                 return 0;
1244
1245         case IF_PROTO_FR:
1246                 if(!capable(CAP_NET_ADMIN))
1247                         return -EPERM;
1248
1249                 if(dev->flags & IFF_UP)
1250                         return -EBUSY;
1251
1252                 if (copy_from_user(&new_settings, fr_s, size))
1253                         return -EFAULT;
1254
1255                 if (new_settings.lmi == LMI_DEFAULT)
1256                         new_settings.lmi = LMI_ANSI;
1257
1258                 if ((new_settings.lmi != LMI_NONE &&
1259                      new_settings.lmi != LMI_ANSI &&
1260                      new_settings.lmi != LMI_CCITT &&
1261                      new_settings.lmi != LMI_CISCO) ||
1262                     new_settings.t391 < 1 ||
1263                     new_settings.t392 < 2 ||
1264                     new_settings.n391 < 1 ||
1265                     new_settings.n392 < 1 ||
1266                     new_settings.n393 < new_settings.n392 ||
1267                     new_settings.n393 > 32 ||
1268                     (new_settings.dce != 0 &&
1269                      new_settings.dce != 1))
1270                         return -EINVAL;
1271
1272                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1273                 if (result)
1274                         return result;
1275
1276                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1277                         result = attach_hdlc_protocol(dev, &proto,
1278                                                       sizeof(struct frad_state));
1279                         if (result)
1280                                 return result;
1281                         state(hdlc)->first_pvc = NULL;
1282                         state(hdlc)->dce_pvc_count = 0;
1283                 }
1284                 memcpy(&state(hdlc)->settings, &new_settings, size);
1285
1286                 dev->hard_start_xmit = hdlc->xmit;
1287                 dev->type = ARPHRD_FRAD;
1288                 return 0;
1289
1290         case IF_PROTO_FR_ADD_PVC:
1291         case IF_PROTO_FR_DEL_PVC:
1292         case IF_PROTO_FR_ADD_ETH_PVC:
1293         case IF_PROTO_FR_DEL_ETH_PVC:
1294                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1295                         return -EINVAL;
1296
1297                 if(!capable(CAP_NET_ADMIN))
1298                         return -EPERM;
1299
1300                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1301                                    sizeof(fr_proto_pvc)))
1302                         return -EFAULT;
1303
1304                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1305                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1306
1307                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1308                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1309                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1310                 else
1311                         result = ARPHRD_DLCI;
1312
1313                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1314                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1315                         return fr_add_pvc(dev, pvc.dlci, result);
1316                 else
1317                         return fr_del_pvc(hdlc, pvc.dlci, result);
1318         }
1319
1320         return -EINVAL;
1321 }
1322
1323
1324 static int __init mod_init(void)
1325 {
1326         register_hdlc_protocol(&proto);
1327         return 0;
1328 }
1329
1330
1331 static void __exit mod_exit(void)
1332 {
1333         unregister_hdlc_protocol(&proto);
1334 }
1335
1336
1337 module_init(mod_init);
1338 module_exit(mod_exit);
1339
1340 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1341 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1342 MODULE_LICENSE("GPL v2");