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/random.h>
  46 #include <linux/inetdevice.h>
  47 #include <linux/lapb.h>
  48 #include <linux/rtnetlink.h>
  49 #include <linux/etherdevice.h>
  50 #include <linux/hdlc.h>
  51
  52 #undef DEBUG_PKT
  53 #undef DEBUG_ECN
  54 #undef DEBUG_LINK
  55 #undef DEBUG_PROTO
  56 #undef DEBUG_PVC
  57
  58 #define FR_UI                   0x03
  59 #define FR_PAD                  0x00
  60
  61 #define NLPID_IP                0xCC
  62 #define NLPID_IPV6              0x8E
  63 #define NLPID_SNAP              0x80
  64 #define NLPID_PAD               0x00
  65 #define NLPID_CCITT_ANSI_LMI    0x08
  66 #define NLPID_CISCO_LMI         0x09
  67
  68
  69 #define LMI_CCITT_ANSI_DLCI        0 /* LMI DLCI */
  70 #define LMI_CISCO_DLCI          1023
  71
  72 #define LMI_CALLREF             0x00 /* Call Reference */
  73 #define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI locking shift */
  74 #define LMI_ANSI_CISCO_REPTYPE  0x01 /* report type */
  75 #define LMI_CCITT_REPTYPE       0x51
  76 #define LMI_ANSI_CISCO_ALIVE    0x03 /* keep alive */
  77 #define LMI_CCITT_ALIVE         0x53
  78 #define LMI_ANSI_CISCO_PVCSTAT  0x07 /* PVC status */
  79 #define LMI_CCITT_PVCSTAT       0x57
  80
  81 #define LMI_FULLREP             0x00 /* full report  */
  82 #define LMI_INTEGRITY           0x01 /* link integrity report */
  83 #define LMI_SINGLE              0x02 /* single PVC report */
  84
  85 #define LMI_STATUS_ENQUIRY      0x75
  86 #define LMI_STATUS              0x7D /* reply */
  87
  88 #define LMI_REPT_LEN               1 /* report type element length */
  89 #define LMI_INTEG_LEN              2 /* link integrity element length */
  90
  91 #define LMI_CCITT_CISCO_LENGTH    13 /* LMI frame lengths */
  92 #define LMI_ANSI_LENGTH           14
  93
  94
  95 typedef struct {
  96 #if defined(__LITTLE_ENDIAN_BITFIELD)
  97         unsigned ea1:   1;
  98         unsigned cr:    1;
  99         unsigned dlcih: 6;
 100
 101         unsigned ea2:   1;
 102         unsigned de:    1;
 103         unsigned becn:  1;
 104         unsigned fecn:  1;
 105         unsigned dlcil: 4;
 106 #else
 107         unsigned dlcih: 6;
 108         unsigned cr:    1;
 109         unsigned ea1:   1;
 110
 111         unsigned dlcil: 4;
 112         unsigned fecn:  1;
 113         unsigned becn:  1;
 114         unsigned de:    1;
 115         unsigned ea2:   1;
 116 #endif
 117 }__attribute__ ((packed)) fr_hdr;
 118
 119
 120 typedef struct pvc_device_struct {
 121         struct net_device *frad;
 122         struct net_device *main;
 123         struct net_device *ether;       /* bridged Ethernet interface   */
 124         struct pvc_device_struct *next; /* Sorted in ascending DLCI order */
 125         int dlci;
 126         int open_count;
 127
 128         struct {
 129                 unsigned int new: 1;
 130                 unsigned int active: 1;
 131                 unsigned int exist: 1;
 132                 unsigned int deleted: 1;
 133                 unsigned int fecn: 1;
 134                 unsigned int becn: 1;
 135                 unsigned int bandwidth; /* Cisco LMI reporting only */
 136         }state;
 137 }pvc_device;
 138
 139
 140 struct frad_state {
 141         fr_proto settings;
 142         pvc_device *first_pvc;
 143         int dce_pvc_count;
 144
 145         struct timer_list timer;
 146         unsigned long last_poll;
 147         int reliable;
 148         int dce_changed;
 149         int request;
 150         int fullrep_sent;
 151         u32 last_errors; /* last errors bit list */
 152         u8 n391cnt;
 153         u8 txseq; /* TX sequence number */
 154         u8 rxseq; /* RX sequence number */
 155 };
 156
 157
 158 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 159
 160
 161 static inline u16 q922_to_dlci(u8 *hdr)
 162 {
 163         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 164 }
 165
 166
 167 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 168 {
 169         hdr[0] = (dlci >> 2) & 0xFC;
 170         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 171 }
 172
 173
 174 static inline struct frad_state * state(hdlc_device *hdlc)
 175 {
 176         return(struct frad_state *)(hdlc->state);
 177 }
 178
 179
 180 static __inline__ pvc_device* dev_to_pvc(struct net_device *dev)
 181 {
 182         return dev->priv;
 183 }
 184
 185
 186 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
 187 {
 188         pvc_device *pvc = state(hdlc)->first_pvc;
 189
 190         while (pvc) {
 191                 if (pvc->dlci == dlci)
 192                         return pvc;
 193                 if (pvc->dlci > dlci)
 194                         return NULL; /* the listed is sorted */
 195                 pvc = pvc->next;
 196         }
 197
 198         return NULL;
 199 }
 200
 201
 202 static pvc_device* add_pvc(struct net_device *dev, u16 dlci)
 203 {
 204         hdlc_device *hdlc = dev_to_hdlc(dev);
 205         pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 206
 207         while (*pvc_p) {
 208                 if ((*pvc_p)->dlci == dlci)
 209                         return *pvc_p;
 210                 if ((*pvc_p)->dlci > dlci)
 211                         break;  /* the list is sorted */
 212                 pvc_p = &(*pvc_p)->next;
 213         }
 214
 215         pvc = kmalloc(sizeof(pvc_device), GFP_ATOMIC);
 216 #ifdef DEBUG_PVC
 217         printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
 218 #endif
 219         if (!pvc)
 220                 return NULL;
 221
 222         memset(pvc, 0, sizeof(pvc_device));
 223         pvc->dlci = dlci;
 224         pvc->frad = dev;
 225         pvc->next = *pvc_p;     /* Put it in the chain */
 226         *pvc_p = pvc;
 227         return pvc;
 228 }
 229
 230
 231 static inline int pvc_is_used(pvc_device *pvc)
 232 {
 233         return pvc->main || pvc->ether;
 234 }
 235
 236
 237 static inline void pvc_carrier(int on, pvc_device *pvc)
 238 {
 239         if (on) {
 240                 if (pvc->main)
 241                         if (!netif_carrier_ok(pvc->main))
 242                                 netif_carrier_on(pvc->main);
 243                 if (pvc->ether)
 244                         if (!netif_carrier_ok(pvc->ether))
 245                                 netif_carrier_on(pvc->ether);
 246         } else {
 247                 if (pvc->main)
 248                         if (netif_carrier_ok(pvc->main))
 249                                 netif_carrier_off(pvc->main);
 250                 if (pvc->ether)
 251                         if (netif_carrier_ok(pvc->ether))
 252                                 netif_carrier_off(pvc->ether);
 253         }
 254 }
 255
 256
 257 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 258 {
 259         pvc_device **pvc_p = &state(hdlc)->first_pvc;
 260
 261         while (*pvc_p) {
 262                 if (!pvc_is_used(*pvc_p)) {
 263                         pvc_device *pvc = *pvc_p;
 264 #ifdef DEBUG_PVC
 265                         printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
 266 #endif
 267                         *pvc_p = pvc->next;
 268                         kfree(pvc);
 269                         continue;
 270                 }
 271                 pvc_p = &(*pvc_p)->next;
 272         }
 273 }
 274
 275
 276 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
 277 {
 278         if (type == ARPHRD_ETHER)
 279                 return &pvc->ether;
 280         else
 281                 return &pvc->main;
 282 }
 283
 284
 285 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 286 {
 287         u16 head_len;
 288         struct sk_buff *skb = *skb_p;
 289
 290         switch (skb->protocol) {
 291         case __constant_ntohs(NLPID_CCITT_ANSI_LMI):
 292                 head_len = 4;
 293                 skb_push(skb, head_len);
 294                 skb->data[3] = NLPID_CCITT_ANSI_LMI;
 295                 break;
 296
 297         case __constant_ntohs(NLPID_CISCO_LMI):
 298                 head_len = 4;
 299                 skb_push(skb, head_len);
 300                 skb->data[3] = NLPID_CISCO_LMI;
 301                 break;
 302
 303         case __constant_ntohs(ETH_P_IP):
 304                 head_len = 4;
 305                 skb_push(skb, head_len);
 306                 skb->data[3] = NLPID_IP;
 307                 break;
 308
 309         case __constant_ntohs(ETH_P_IPV6):
 310                 head_len = 4;
 311                 skb_push(skb, head_len);
 312                 skb->data[3] = NLPID_IPV6;
 313                 break;
 314
 315         case __constant_ntohs(ETH_P_802_3):
 316                 head_len = 10;
 317                 if (skb_headroom(skb) < head_len) {
 318                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 319                                                                     head_len);
 320                         if (!skb2)
 321                                 return -ENOBUFS;
 322                         dev_kfree_skb(skb);
 323                         skb = *skb_p = skb2;
 324                 }
 325                 skb_push(skb, head_len);
 326                 skb->data[3] = FR_PAD;
 327                 skb->data[4] = NLPID_SNAP;
 328                 skb->data[5] = FR_PAD;
 329                 skb->data[6] = 0x80;
 330                 skb->data[7] = 0xC2;
 331                 skb->data[8] = 0x00;
 332                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 333                 break;
 334
 335         default:
 336                 head_len = 10;
 337                 skb_push(skb, head_len);
 338                 skb->data[3] = FR_PAD;
 339                 skb->data[4] = NLPID_SNAP;
 340                 skb->data[5] = FR_PAD;
 341                 skb->data[6] = FR_PAD;
 342                 skb->data[7] = FR_PAD;
 343                 *(u16*)(skb->data + 8) = skb->protocol;
 344         }
 345
 346         dlci_to_q922(skb->data, dlci);
 347         skb->data[2] = FR_UI;
 348         return 0;
 349 }
 350
 351
 352
 353 static int pvc_open(struct net_device *dev)
 354 {
 355         pvc_device *pvc = dev_to_pvc(dev);
 356
 357         if ((pvc->frad->flags & IFF_UP) == 0)
 358                 return -EIO;  /* Frad must be UP in order to activate PVC */
 359
 360         if (pvc->open_count++ == 0) {
 361                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 362                 if (state(hdlc)->settings.lmi == LMI_NONE)
 363                         pvc->state.active = netif_carrier_ok(pvc->frad);
 364
 365                 pvc_carrier(pvc->state.active, pvc);
 366                 state(hdlc)->dce_changed = 1;
 367         }
 368         return 0;
 369 }
 370
 371
 372
 373 static int pvc_close(struct net_device *dev)
 374 {
 375         pvc_device *pvc = dev_to_pvc(dev);
 376
 377         if (--pvc->open_count == 0) {
 378                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 379                 if (state(hdlc)->settings.lmi == LMI_NONE)
 380                         pvc->state.active = 0;
 381
 382                 if (state(hdlc)->settings.dce) {
 383                         state(hdlc)->dce_changed = 1;
 384                         pvc->state.active = 0;
 385                 }
 386         }
 387         return 0;
 388 }
 389
 390
 391
 392 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 393 {
 394         pvc_device *pvc = dev_to_pvc(dev);
 395         fr_proto_pvc_info info;
 396
 397         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 398                 if (dev->type == ARPHRD_ETHER)
 399                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 400                 else
 401                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 402
 403                 if (ifr->ifr_settings.size < sizeof(info)) {
 404                         /* data size wanted */
 405                         ifr->ifr_settings.size = sizeof(info);
 406                         return -ENOBUFS;
 407                 }
 408
 409                 info.dlci = pvc->dlci;
 410                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 411                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 412                                  &info, sizeof(info)))
 413                         return -EFAULT;
 414                 return 0;
 415         }
 416
 417         return -EINVAL;
 418 }
 419
 420
 421 static inline struct net_device_stats *pvc_get_stats(struct net_device *dev)
 422 {
 423         return &dev_to_desc(dev)->stats;
 424 }
 425
 426
 427
 428 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 429 {
 430         pvc_device *pvc = dev_to_pvc(dev);
 431         struct net_device_stats *stats = pvc_get_stats(dev);
 432
 433         if (pvc->state.active) {
 434                 if (dev->type == ARPHRD_ETHER) {
 435                         int pad = ETH_ZLEN - skb->len;
 436                         if (pad > 0) { /* Pad the frame with zeros */
 437                                 int len = skb->len;
 438                                 if (skb_tailroom(skb) < pad)
 439                                         if (pskb_expand_head(skb, 0, pad,
 440                                                              GFP_ATOMIC)) {
 441                                                 stats->tx_dropped++;
 442                                                 dev_kfree_skb(skb);
 443                                                 return 0;
 444                                         }
 445                                 skb_put(skb, pad);
 446                                 memset(skb->data + len, 0, pad);
 447                         }
 448                         skb->protocol = __constant_htons(ETH_P_802_3);
 449                 }
 450                 if (!fr_hard_header(&skb, pvc->dlci)) {
 451                         stats->tx_bytes += skb->len;
 452                         stats->tx_packets++;
 453                         if (pvc->state.fecn) /* TX Congestion counter */
 454                                 stats->tx_compressed++;
 455                         skb->dev = pvc->frad;
 456                         dev_queue_xmit(skb);
 457                         return 0;
 458                 }
 459         }
 460
 461         stats->tx_dropped++;
 462         dev_kfree_skb(skb);
 463         return 0;
 464 }
 465
 466
 467
 468 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
 469 {
 470         if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
 471                 return -EINVAL;
 472         dev->mtu = new_mtu;
 473         return 0;
 474 }
 475
 476
 477
 478 static inline void fr_log_dlci_active(pvc_device *pvc)
 479 {
 480         printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
 481                pvc->frad->name,
 482                pvc->dlci,
 483                pvc->main ? pvc->main->name : "",
 484                pvc->main && pvc->ether ? " " : "",
 485                pvc->ether ? pvc->ether->name : "",
 486                pvc->state.new ? " new" : "",
 487                !pvc->state.exist ? "deleted" :
 488                pvc->state.active ? "active" : "inactive");
 489 }
 490
 491
 492
 493 static inline u8 fr_lmi_nextseq(u8 x)
 494 {
 495         x++;
 496         return x ? x : 1;
 497 }
 498
 499
 500 static void fr_lmi_send(struct net_device *dev, int fullrep)
 501 {
 502         hdlc_device *hdlc = dev_to_hdlc(dev);
 503         struct sk_buff *skb;
 504         pvc_device *pvc = state(hdlc)->first_pvc;
 505         int lmi = state(hdlc)->settings.lmi;
 506         int dce = state(hdlc)->settings.dce;
 507         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 508         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 509         u8 *data;
 510         int i = 0;
 511
 512         if (dce && fullrep) {
 513                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 514                 if (len > HDLC_MAX_MRU) {
 515                         printk(KERN_WARNING "%s: Too many PVCs while sending "
 516                                "LMI full report\n", dev->name);
 517                         return;
 518                 }
 519         }
 520
 521         skb = dev_alloc_skb(len);
 522         if (!skb) {
 523                 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
 524                        dev->name);
 525                 return;
 526         }
 527         memset(skb->data, 0, len);
 528         skb_reserve(skb, 4);
 529         if (lmi == LMI_CISCO) {
 530                 skb->protocol = __constant_htons(NLPID_CISCO_LMI);
 531                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 532         } else {
 533                 skb->protocol = __constant_htons(NLPID_CCITT_ANSI_LMI);
 534                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 535         }
 536         data = skb_tail_pointer(skb);
 537         data[i++] = LMI_CALLREF;
 538         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 539         if (lmi == LMI_ANSI)
 540                 data[i++] = LMI_ANSI_LOCKSHIFT;
 541         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 542                 LMI_ANSI_CISCO_REPTYPE;
 543         data[i++] = LMI_REPT_LEN;
 544         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 545         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 546         data[i++] = LMI_INTEG_LEN;
 547         data[i++] = state(hdlc)->txseq =
 548                 fr_lmi_nextseq(state(hdlc)->txseq);
 549         data[i++] = state(hdlc)->rxseq;
 550
 551         if (dce && fullrep) {
 552                 while (pvc) {
 553                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 554                                 LMI_ANSI_CISCO_PVCSTAT;
 555                         data[i++] = stat_len;
 556
 557                         /* LMI start/restart */
 558                         if (state(hdlc)->reliable && !pvc->state.exist) {
 559                                 pvc->state.exist = pvc->state.new = 1;
 560                                 fr_log_dlci_active(pvc);
 561                         }
 562
 563                         /* ifconfig PVC up */
 564                         if (pvc->open_count && !pvc->state.active &&
 565                             pvc->state.exist && !pvc->state.new) {
 566                                 pvc_carrier(1, pvc);
 567                                 pvc->state.active = 1;
 568                                 fr_log_dlci_active(pvc);
 569                         }
 570
 571                         if (lmi == LMI_CISCO) {
 572                                 data[i] = pvc->dlci >> 8;
 573                                 data[i + 1] = pvc->dlci & 0xFF;
 574                         } else {
 575                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 576                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 577                                 data[i + 2] = 0x80;
 578                         }
 579
 580                         if (pvc->state.new)
 581                                 data[i + 2] |= 0x08;
 582                         else if (pvc->state.active)
 583                                 data[i + 2] |= 0x02;
 584
 585                         i += stat_len;
 586                         pvc = pvc->next;
 587                 }
 588         }
 589
 590         skb_put(skb, i);
 591         skb->priority = TC_PRIO_CONTROL;
 592         skb->dev = dev;
 593         skb_reset_network_header(skb);
 594
 595         dev_queue_xmit(skb);
 596 }
 597
 598
 599
 600 static void fr_set_link_state(int reliable, struct net_device *dev)
 601 {
 602         hdlc_device *hdlc = dev_to_hdlc(dev);
 603         pvc_device *pvc = state(hdlc)->first_pvc;
 604
 605         state(hdlc)->reliable = reliable;
 606         if (reliable) {
 607                 netif_dormant_off(dev);
 608                 state(hdlc)->n391cnt = 0; /* Request full status */
 609                 state(hdlc)->dce_changed = 1;
 610
 611                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 612                         while (pvc) {   /* Activate all PVCs */
 613                                 pvc_carrier(1, pvc);
 614                                 pvc->state.exist = pvc->state.active = 1;
 615                                 pvc->state.new = 0;
 616                                 pvc = pvc->next;
 617                         }
 618                 }
 619         } else {
 620                 netif_dormant_on(dev);
 621                 while (pvc) {           /* Deactivate all PVCs */
 622                         pvc_carrier(0, pvc);
 623                         pvc->state.exist = pvc->state.active = 0;
 624                         pvc->state.new = 0;
 625                         if (!state(hdlc)->settings.dce)
 626                                 pvc->state.bandwidth = 0;
 627                         pvc = pvc->next;
 628                 }
 629         }
 630 }
 631
 632
 633 static void fr_timer(unsigned long arg)
 634 {
 635         struct net_device *dev = (struct net_device *)arg;
 636         hdlc_device *hdlc = dev_to_hdlc(dev);
 637         int i, cnt = 0, reliable;
 638         u32 list;
 639
 640         if (state(hdlc)->settings.dce) {
 641                 reliable = state(hdlc)->request &&
 642                         time_before(jiffies, state(hdlc)->last_poll +
 643                                     state(hdlc)->settings.t392 * HZ);
 644                 state(hdlc)->request = 0;
 645         } else {
 646                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 647                 if (state(hdlc)->request) {
 648                         if (state(hdlc)->reliable)
 649                                 printk(KERN_INFO "%s: No LMI status reply "
 650                                        "received\n", dev->name);
 651                         state(hdlc)->last_errors |= 1;
 652                 }
 653
 654                 list = state(hdlc)->last_errors;
 655                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 656                         cnt += (list & 1);      /* errors count */
 657
 658                 reliable = (cnt < state(hdlc)->settings.n392);
 659         }
 660
 661         if (state(hdlc)->reliable != reliable) {
 662                 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
 663                        reliable ? "" : "un");
 664                 fr_set_link_state(reliable, dev);
 665         }
 666
 667         if (state(hdlc)->settings.dce)
 668                 state(hdlc)->timer.expires = jiffies +
 669                         state(hdlc)->settings.t392 * HZ;
 670         else {
 671                 if (state(hdlc)->n391cnt)
 672                         state(hdlc)->n391cnt--;
 673
 674                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 675
 676                 state(hdlc)->last_poll = jiffies;
 677                 state(hdlc)->request = 1;
 678                 state(hdlc)->timer.expires = jiffies +
 679                         state(hdlc)->settings.t391 * HZ;
 680         }
 681
 682         state(hdlc)->timer.function = fr_timer;
 683         state(hdlc)->timer.data = arg;
 684         add_timer(&state(hdlc)->timer);
 685 }
 686
 687
 688 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 689 {
 690         hdlc_device *hdlc = dev_to_hdlc(dev);
 691         pvc_device *pvc;
 692         u8 rxseq, txseq;
 693         int lmi = state(hdlc)->settings.lmi;
 694         int dce = state(hdlc)->settings.dce;
 695         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 696
 697         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 698                         LMI_CCITT_CISCO_LENGTH)) {
 699                 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
 700                 return 1;
 701         }
 702
 703         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 704                              NLPID_CCITT_ANSI_LMI)) {
 705                 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
 706                        dev->name);
 707                 return 1;
 708         }
 709
 710         if (skb->data[4] != LMI_CALLREF) {
 711                 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n",
 712                        dev->name, skb->data[4]);
 713                 return 1;
 714         }
 715
 716         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 717                 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n",
 718                        dev->name, skb->data[5]);
 719                 return 1;
 720         }
 721
 722         if (lmi == LMI_ANSI) {
 723                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 724                         printk(KERN_INFO "%s: Not ANSI locking shift in LMI"
 725                                " message (0x%02X)\n", dev->name, skb->data[6]);
 726                         return 1;
 727                 }
 728                 i = 7;
 729         } else
 730                 i = 6;
 731
 732         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 733                              LMI_ANSI_CISCO_REPTYPE)) {
 734                 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n",
 735                        dev->name, skb->data[i]);
 736                 return 1;
 737         }
 738
 739         if (skb->data[++i] != LMI_REPT_LEN) {
 740                 printk(KERN_INFO "%s: Invalid LMI Report type IE length"
 741                        " (%u)\n", dev->name, skb->data[i]);
 742                 return 1;
 743         }
 744
 745         reptype = skb->data[++i];
 746         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 747                 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n",
 748                        dev->name, reptype);
 749                 return 1;
 750         }
 751
 752         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 753                                LMI_ANSI_CISCO_ALIVE)) {
 754                 printk(KERN_INFO "%s: Not an LMI Link integrity verification"
 755                        " IE (0x%02X)\n", dev->name, skb->data[i]);
 756                 return 1;
 757         }
 758
 759         if (skb->data[++i] != LMI_INTEG_LEN) {
 760                 printk(KERN_INFO "%s: Invalid LMI Link integrity verification"
 761                        " IE length (%u)\n", dev->name, skb->data[i]);
 762                 return 1;
 763         }
 764         i++;
 765
 766         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 767         rxseq = skb->data[i++]; /* Should confirm our sequence */
 768
 769         txseq = state(hdlc)->txseq;
 770
 771         if (dce)
 772                 state(hdlc)->last_poll = jiffies;
 773
 774         error = 0;
 775         if (!state(hdlc)->reliable)
 776                 error = 1;
 777
 778         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 779                 state(hdlc)->n391cnt = 0;
 780                 error = 1;
 781         }
 782
 783         if (dce) {
 784                 if (state(hdlc)->fullrep_sent && !error) {
 785 /* Stop sending full report - the last one has been confirmed by DTE */
 786                         state(hdlc)->fullrep_sent = 0;
 787                         pvc = state(hdlc)->first_pvc;
 788                         while (pvc) {
 789                                 if (pvc->state.new) {
 790                                         pvc->state.new = 0;
 791
 792 /* Tell DTE that new PVC is now active */
 793                                         state(hdlc)->dce_changed = 1;
 794                                 }
 795                                 pvc = pvc->next;
 796                         }
 797                 }
 798
 799                 if (state(hdlc)->dce_changed) {
 800                         reptype = LMI_FULLREP;
 801                         state(hdlc)->fullrep_sent = 1;
 802                         state(hdlc)->dce_changed = 0;
 803                 }
 804
 805                 state(hdlc)->request = 1; /* got request */
 806                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 807                 return 0;
 808         }
 809
 810         /* DTE */
 811
 812         state(hdlc)->request = 0; /* got response, no request pending */
 813
 814         if (error)
 815                 return 0;
 816
 817         if (reptype != LMI_FULLREP)
 818                 return 0;
 819
 820         pvc = state(hdlc)->first_pvc;
 821
 822         while (pvc) {
 823                 pvc->state.deleted = 1;
 824                 pvc = pvc->next;
 825         }
 826
 827         no_ram = 0;
 828         while (skb->len >= i + 2 + stat_len) {
 829                 u16 dlci;
 830                 u32 bw;
 831                 unsigned int active, new;
 832
 833                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 834                                        LMI_ANSI_CISCO_PVCSTAT)) {
 835                         printk(KERN_INFO "%s: Not an LMI PVC status IE"
 836                                " (0x%02X)\n", dev->name, skb->data[i]);
 837                         return 1;
 838                 }
 839
 840                 if (skb->data[++i] != stat_len) {
 841                         printk(KERN_INFO "%s: Invalid LMI PVC status IE length"
 842                                " (%u)\n", dev->name, skb->data[i]);
 843                         return 1;
 844                 }
 845                 i++;
 846
 847                 new = !! (skb->data[i + 2] & 0x08);
 848                 active = !! (skb->data[i + 2] & 0x02);
 849                 if (lmi == LMI_CISCO) {
 850                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 851                         bw = (skb->data[i + 3] << 16) |
 852                                 (skb->data[i + 4] << 8) |
 853                                 (skb->data[i + 5]);
 854                 } else {
 855                         dlci = ((skb->data[i] & 0x3F) << 4) |
 856                                 ((skb->data[i + 1] & 0x78) >> 3);
 857                         bw = 0;
 858                 }
 859
 860                 pvc = add_pvc(dev, dlci);
 861
 862                 if (!pvc && !no_ram) {
 863                         printk(KERN_WARNING
 864                                "%s: Memory squeeze on fr_lmi_recv()\n",
 865                                dev->name);
 866                         no_ram = 1;
 867                 }
 868
 869                 if (pvc) {
 870                         pvc->state.exist = 1;
 871                         pvc->state.deleted = 0;
 872                         if (active != pvc->state.active ||
 873                             new != pvc->state.new ||
 874                             bw != pvc->state.bandwidth ||
 875                             !pvc->state.exist) {
 876                                 pvc->state.new = new;
 877                                 pvc->state.active = active;
 878                                 pvc->state.bandwidth = bw;
 879                                 pvc_carrier(active, pvc);
 880                                 fr_log_dlci_active(pvc);
 881                         }
 882                 }
 883
 884                 i += stat_len;
 885         }
 886
 887         pvc = state(hdlc)->first_pvc;
 888
 889         while (pvc) {
 890                 if (pvc->state.deleted && pvc->state.exist) {
 891                         pvc_carrier(0, pvc);
 892                         pvc->state.active = pvc->state.new = 0;
 893                         pvc->state.exist = 0;
 894                         pvc->state.bandwidth = 0;
 895                         fr_log_dlci_active(pvc);
 896                 }
 897                 pvc = pvc->next;
 898         }
 899
 900         /* Next full report after N391 polls */
 901         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 902
 903         return 0;
 904 }
 905
 906
 907 static int fr_rx(struct sk_buff *skb)
 908 {
 909         struct net_device *frad = skb->dev;
 910         hdlc_device *hdlc = dev_to_hdlc(frad);
 911         fr_hdr *fh = (fr_hdr*)skb->data;
 912         u8 *data = skb->data;
 913         u16 dlci;
 914         pvc_device *pvc;
 915         struct net_device *dev = NULL;
 916
 917         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 918                 goto rx_error;
 919
 920         dlci = q922_to_dlci(skb->data);
 921
 922         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 923              (state(hdlc)->settings.lmi == LMI_ANSI ||
 924               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 925             (dlci == LMI_CISCO_DLCI &&
 926              state(hdlc)->settings.lmi == LMI_CISCO)) {
 927                 if (fr_lmi_recv(frad, skb))
 928                         goto rx_error;
 929                 dev_kfree_skb_any(skb);
 930                 return NET_RX_SUCCESS;
 931         }
 932
 933         pvc = find_pvc(hdlc, dlci);
 934         if (!pvc) {
 935 #ifdef DEBUG_PKT
 936                 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
 937                        frad->name, dlci);
 938 #endif
 939                 dev_kfree_skb_any(skb);
 940                 return NET_RX_DROP;
 941         }
 942
 943         if (pvc->state.fecn != fh->fecn) {
 944 #ifdef DEBUG_ECN
 945                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 946                        dlci, fh->fecn ? "N" : "FF");
 947 #endif
 948                 pvc->state.fecn ^= 1;
 949         }
 950
 951         if (pvc->state.becn != fh->becn) {
 952 #ifdef DEBUG_ECN
 953                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 954                        dlci, fh->becn ? "N" : "FF");
 955 #endif
 956                 pvc->state.becn ^= 1;
 957         }
 958
 959
 960         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 961                 dev_to_desc(frad)->stats.rx_dropped++;
 962                 return NET_RX_DROP;
 963         }
 964
 965         if (data[3] == NLPID_IP) {
 966                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 967                 dev = pvc->main;
 968                 skb->protocol = htons(ETH_P_IP);
 969
 970         } else if (data[3] == NLPID_IPV6) {
 971                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 972                 dev = pvc->main;
 973                 skb->protocol = htons(ETH_P_IPV6);
 974
 975         } else if (skb->len > 10 && data[3] == FR_PAD &&
 976                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 977                 u16 oui = ntohs(*(u16*)(data + 6));
 978                 u16 pid = ntohs(*(u16*)(data + 8));
 979                 skb_pull(skb, 10);
 980
 981                 switch ((((u32)oui) << 16) | pid) {
 982                 case ETH_P_ARP: /* routed frame with SNAP */
 983                 case ETH_P_IPX:
 984                 case ETH_P_IP:  /* a long variant */
 985                 case ETH_P_IPV6:
 986                         dev = pvc->main;
 987                         skb->protocol = htons(pid);
 988                         break;
 989
 990                 case 0x80C20007: /* bridged Ethernet frame */
 991                         if ((dev = pvc->ether) != NULL)
 992                                 skb->protocol = eth_type_trans(skb, dev);
 993                         break;
 994
 995                 default:
 996                         printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
 997                                "PID=%x\n", frad->name, oui, pid);
 998                         dev_kfree_skb_any(skb);
 999                         return NET_RX_DROP;
1000                 }
1001         } else {
1002                 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
1003                        "length = %i\n", frad->name, data[3], skb->len);
1004                 dev_kfree_skb_any(skb);
1005                 return NET_RX_DROP;
1006         }
1007
1008         if (dev) {
1009                 struct net_device_stats *stats = pvc_get_stats(dev);
1010                 stats->rx_packets++; /* PVC traffic */
1011                 stats->rx_bytes += skb->len;
1012                 if (pvc->state.becn)
1013                         stats->rx_compressed++;
1014                 netif_rx(skb);
1015                 return NET_RX_SUCCESS;
1016         } else {
1017                 dev_kfree_skb_any(skb);
1018                 return NET_RX_DROP;
1019         }
1020
1021  rx_error:
1022         dev_to_desc(frad)->stats.rx_errors++; /* Mark error */
1023         dev_kfree_skb_any(skb);
1024         return NET_RX_DROP;
1025 }
1026
1027
1028
1029 static void fr_start(struct net_device *dev)
1030 {
1031         hdlc_device *hdlc = dev_to_hdlc(dev);
1032 #ifdef DEBUG_LINK
1033         printk(KERN_DEBUG "fr_start\n");
1034 #endif
1035         if (state(hdlc)->settings.lmi != LMI_NONE) {
1036                 state(hdlc)->reliable = 0;
1037                 state(hdlc)->dce_changed = 1;
1038                 state(hdlc)->request = 0;
1039                 state(hdlc)->fullrep_sent = 0;
1040                 state(hdlc)->last_errors = 0xFFFFFFFF;
1041                 state(hdlc)->n391cnt = 0;
1042                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1043
1044                 init_timer(&state(hdlc)->timer);
1045                 /* First poll after 1 s */
1046                 state(hdlc)->timer.expires = jiffies + HZ;
1047                 state(hdlc)->timer.function = fr_timer;
1048                 state(hdlc)->timer.data = (unsigned long)dev;
1049                 add_timer(&state(hdlc)->timer);
1050         } else
1051                 fr_set_link_state(1, dev);
1052 }
1053
1054
1055 static void fr_stop(struct net_device *dev)
1056 {
1057         hdlc_device *hdlc = dev_to_hdlc(dev);
1058 #ifdef DEBUG_LINK
1059         printk(KERN_DEBUG "fr_stop\n");
1060 #endif
1061         if (state(hdlc)->settings.lmi != LMI_NONE)
1062                 del_timer_sync(&state(hdlc)->timer);
1063         fr_set_link_state(0, dev);
1064 }
1065
1066
1067 static void fr_close(struct net_device *dev)
1068 {
1069         hdlc_device *hdlc = dev_to_hdlc(dev);
1070         pvc_device *pvc = state(hdlc)->first_pvc;
1071
1072         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1073                 if (pvc->main)
1074                         dev_close(pvc->main);
1075                 if (pvc->ether)
1076                         dev_close(pvc->ether);
1077                 pvc = pvc->next;
1078         }
1079 }
1080
1081
1082 static void pvc_setup(struct net_device *dev)
1083 {
1084         dev->type = ARPHRD_DLCI;
1085         dev->flags = IFF_POINTOPOINT;
1086         dev->hard_header_len = 10;
1087         dev->addr_len = 2;
1088 }
1089
1090 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1091 {
1092         hdlc_device *hdlc = dev_to_hdlc(frad);
1093         pvc_device *pvc = NULL;
1094         struct net_device *dev;
1095         int result, used;
1096         char * prefix = "pvc%d";
1097
1098         if (type == ARPHRD_ETHER)
1099                 prefix = "pvceth%d";
1100
1101         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1102                 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1103                        frad->name);
1104                 return -ENOBUFS;
1105         }
1106
1107         if (*get_dev_p(pvc, type))
1108                 return -EEXIST;
1109
1110         used = pvc_is_used(pvc);
1111
1112         if (type == ARPHRD_ETHER)
1113                 dev = alloc_netdev(sizeof(struct net_device_stats),
1114                                    "pvceth%d", ether_setup);
1115         else
1116                 dev = alloc_netdev(sizeof(struct net_device_stats),
1117                                    "pvc%d", pvc_setup);
1118
1119         if (!dev) {
1120                 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1121                        frad->name);
1122                 delete_unused_pvcs(hdlc);
1123                 return -ENOBUFS;
1124         }
1125
1126         if (type == ARPHRD_ETHER) {
1127                 memcpy(dev->dev_addr, "\x00\x01", 2);
1128                 get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
1129         } else {
1130                 *(u16*)dev->dev_addr = htons(dlci);
1131                 dlci_to_q922(dev->broadcast, dlci);
1132         }
1133         dev->hard_start_xmit = pvc_xmit;
1134         dev->get_stats = pvc_get_stats;
1135         dev->open = pvc_open;
1136         dev->stop = pvc_close;
1137         dev->do_ioctl = pvc_ioctl;
1138         dev->change_mtu = pvc_change_mtu;
1139         dev->mtu = HDLC_MAX_MTU;
1140         dev->tx_queue_len = 0;
1141         dev->priv = pvc;
1142
1143         result = dev_alloc_name(dev, dev->name);
1144         if (result < 0) {
1145                 free_netdev(dev);
1146                 delete_unused_pvcs(hdlc);
1147                 return result;
1148         }
1149
1150         if (register_netdevice(dev) != 0) {
1151                 free_netdev(dev);
1152                 delete_unused_pvcs(hdlc);
1153                 return -EIO;
1154         }
1155
1156         dev->destructor = free_netdev;
1157         *get_dev_p(pvc, type) = dev;
1158         if (!used) {
1159                 state(hdlc)->dce_changed = 1;
1160                 state(hdlc)->dce_pvc_count++;
1161         }
1162         return 0;
1163 }
1164
1165
1166
1167 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1168 {
1169         pvc_device *pvc;
1170         struct net_device *dev;
1171
1172         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1173                 return -ENOENT;
1174
1175         if ((dev = *get_dev_p(pvc, type)) == NULL)
1176                 return -ENOENT;
1177
1178         if (dev->flags & IFF_UP)
1179                 return -EBUSY;          /* PVC in use */
1180
1181         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1182         *get_dev_p(pvc, type) = NULL;
1183
1184         if (!pvc_is_used(pvc)) {
1185                 state(hdlc)->dce_pvc_count--;
1186                 state(hdlc)->dce_changed = 1;
1187         }
1188         delete_unused_pvcs(hdlc);
1189         return 0;
1190 }
1191
1192
1193
1194 static void fr_destroy(struct net_device *frad)
1195 {
1196         hdlc_device *hdlc = dev_to_hdlc(frad);
1197         pvc_device *pvc = state(hdlc)->first_pvc;
1198         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1199         state(hdlc)->dce_pvc_count = 0;
1200         state(hdlc)->dce_changed = 1;
1201
1202         while (pvc) {
1203                 pvc_device *next = pvc->next;
1204                 /* destructors will free_netdev() main and ether */
1205                 if (pvc->main)
1206                         unregister_netdevice(pvc->main);
1207
1208                 if (pvc->ether)
1209                         unregister_netdevice(pvc->ether);
1210
1211                 kfree(pvc);
1212                 pvc = next;
1213         }
1214 }
1215
1216
1217 static struct hdlc_proto proto = {
1218         .close          = fr_close,
1219         .start          = fr_start,
1220         .stop           = fr_stop,
1221         .detach         = fr_destroy,
1222         .ioctl          = fr_ioctl,
1223         .module         = THIS_MODULE,
1224 };
1225
1226
1227 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1228 {
1229         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1230         const size_t size = sizeof(fr_proto);
1231         fr_proto new_settings;
1232         hdlc_device *hdlc = dev_to_hdlc(dev);
1233         fr_proto_pvc pvc;
1234         int result;
1235
1236         switch (ifr->ifr_settings.type) {
1237         case IF_GET_PROTO:
1238                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1239                         return -EINVAL;
1240                 ifr->ifr_settings.type = IF_PROTO_FR;
1241                 if (ifr->ifr_settings.size < size) {
1242                         ifr->ifr_settings.size = size; /* data size wanted */
1243                         return -ENOBUFS;
1244                 }
1245                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1246                         return -EFAULT;
1247                 return 0;
1248
1249         case IF_PROTO_FR:
1250                 if(!capable(CAP_NET_ADMIN))
1251                         return -EPERM;
1252
1253                 if(dev->flags & IFF_UP)
1254                         return -EBUSY;
1255
1256                 if (copy_from_user(&new_settings, fr_s, size))
1257                         return -EFAULT;
1258
1259                 if (new_settings.lmi == LMI_DEFAULT)
1260                         new_settings.lmi = LMI_ANSI;
1261
1262                 if ((new_settings.lmi != LMI_NONE &&
1263                      new_settings.lmi != LMI_ANSI &&
1264                      new_settings.lmi != LMI_CCITT &&
1265                      new_settings.lmi != LMI_CISCO) ||
1266                     new_settings.t391 < 1 ||
1267                     new_settings.t392 < 2 ||
1268                     new_settings.n391 < 1 ||
1269                     new_settings.n392 < 1 ||
1270                     new_settings.n393 < new_settings.n392 ||
1271                     new_settings.n393 > 32 ||
1272                     (new_settings.dce != 0 &&
1273                      new_settings.dce != 1))
1274                         return -EINVAL;
1275
1276                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1277                 if (result)
1278                         return result;
1279
1280                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1281                         result = attach_hdlc_protocol(dev, &proto, fr_rx,
1282                                                       sizeof(struct frad_state));
1283                         if (result)
1284                                 return result;
1285                         state(hdlc)->first_pvc = NULL;
1286                         state(hdlc)->dce_pvc_count = 0;
1287                 }
1288                 memcpy(&state(hdlc)->settings, &new_settings, size);
1289
1290                 dev->hard_start_xmit = hdlc->xmit;
1291                 dev->type = ARPHRD_FRAD;
1292                 return 0;
1293
1294         case IF_PROTO_FR_ADD_PVC:
1295         case IF_PROTO_FR_DEL_PVC:
1296         case IF_PROTO_FR_ADD_ETH_PVC:
1297         case IF_PROTO_FR_DEL_ETH_PVC:
1298                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1299                         return -EINVAL;
1300
1301                 if(!capable(CAP_NET_ADMIN))
1302                         return -EPERM;
1303
1304                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1305                                    sizeof(fr_proto_pvc)))
1306                         return -EFAULT;
1307
1308                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1309                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1310
1311                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1312                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1313                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1314                 else
1315                         result = ARPHRD_DLCI;
1316
1317                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1318                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1319                         return fr_add_pvc(dev, pvc.dlci, result);
1320                 else
1321                         return fr_del_pvc(hdlc, pvc.dlci, result);
1322         }
1323
1324         return -EINVAL;
1325 }
1326
1327
1328 static int __init mod_init(void)
1329 {
1330         register_hdlc_protocol(&proto);
1331         return 0;
1332 }
1333
1334
1335 static void __exit mod_exit(void)
1336 {
1337         unregister_hdlc_protocol(&proto);
1338 }
1339
1340
1341 module_init(mod_init);
1342 module_exit(mod_exit);
1343
1344 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1345 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1346 MODULE_LICENSE("GPL v2");