drivers/net/wan/hdlc_fr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Generic HDLC support routines for Linux
   4  * Frame Relay support
   5  *
   6  * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
   7  *
   8
   9             Theory of PVC state
  10
  11  DCE mode:
  12
  13  (exist,new) -> 0,0 when "PVC create" or if "link unreliable"
  14          0,x -> 1,1 if "link reliable" when sending FULL STATUS
  15          1,1 -> 1,0 if received FULL STATUS ACK
  16
  17  (active)    -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create"
  18              -> 1 when "PVC up" and (exist,new) = 1,0
  19
  20  DTE mode:
  21  (exist,new,active) = FULL STATUS if "link reliable"
  22                     = 0, 0, 0 if "link unreliable"
  23  No LMI:
  24  active = open and "link reliable"
  25  exist = new = not used
  26
  27  CCITT LMI: ITU-T Q.933 Annex A
  28  ANSI LMI: ANSI T1.617 Annex D
  29  CISCO LMI: the original, aka "Gang of Four" LMI
  30
  31 */
  32
  33 #include <linux/errno.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/hdlc.h>
  36 #include <linux/if_arp.h>
  37 #include <linux/inetdevice.h>
  38 #include <linux/init.h>
  39 #include <linux/kernel.h>
  40 #include <linux/module.h>
  41 #include <linux/pkt_sched.h>
  42 #include <linux/poll.h>
  43 #include <linux/rtnetlink.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/slab.h>
  46
  47 #undef DEBUG_PKT
  48 #undef DEBUG_ECN
  49 #undef DEBUG_LINK
  50 #undef DEBUG_PROTO
  51 #undef DEBUG_PVC
  52
  53 #define FR_UI                   0x03
  54 #define FR_PAD                  0x00
  55
  56 #define NLPID_IP                0xCC
  57 #define NLPID_IPV6              0x8E
  58 #define NLPID_SNAP              0x80
  59 #define NLPID_PAD               0x00
  60 #define NLPID_CCITT_ANSI_LMI    0x08
  61 #define NLPID_CISCO_LMI         0x09
  62
  63
  64 #define LMI_CCITT_ANSI_DLCI        0 /* LMI DLCI */
  65 #define LMI_CISCO_DLCI          1023
  66
  67 #define LMI_CALLREF             0x00 /* Call Reference */
  68 #define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI locking shift */
  69 #define LMI_ANSI_CISCO_REPTYPE  0x01 /* report type */
  70 #define LMI_CCITT_REPTYPE       0x51
  71 #define LMI_ANSI_CISCO_ALIVE    0x03 /* keep alive */
  72 #define LMI_CCITT_ALIVE         0x53
  73 #define LMI_ANSI_CISCO_PVCSTAT  0x07 /* PVC status */
  74 #define LMI_CCITT_PVCSTAT       0x57
  75
  76 #define LMI_FULLREP             0x00 /* full report  */
  77 #define LMI_INTEGRITY           0x01 /* link integrity report */
  78 #define LMI_SINGLE              0x02 /* single PVC report */
  79
  80 #define LMI_STATUS_ENQUIRY      0x75
  81 #define LMI_STATUS              0x7D /* reply */
  82
  83 #define LMI_REPT_LEN               1 /* report type element length */
  84 #define LMI_INTEG_LEN              2 /* link integrity element length */
  85
  86 #define LMI_CCITT_CISCO_LENGTH    13 /* LMI frame lengths */
  87 #define LMI_ANSI_LENGTH           14
  88
  89
  90 struct fr_hdr {
  91 #if defined(__LITTLE_ENDIAN_BITFIELD)
  92         unsigned ea1:   1;
  93         unsigned cr:    1;
  94         unsigned dlcih: 6;
  95
  96         unsigned ea2:   1;
  97         unsigned de:    1;
  98         unsigned becn:  1;
  99         unsigned fecn:  1;
 100         unsigned dlcil: 4;
 101 #else
 102         unsigned dlcih: 6;
 103         unsigned cr:    1;
 104         unsigned ea1:   1;
 105
 106         unsigned dlcil: 4;
 107         unsigned fecn:  1;
 108         unsigned becn:  1;
 109         unsigned de:    1;
 110         unsigned ea2:   1;
 111 #endif
 112 } __packed;
 113
 114
 115 struct pvc_device {
 116         struct net_device *frad;
 117         struct net_device *main;
 118         struct net_device *ether;       /* bridged Ethernet interface   */
 119         struct pvc_device *next;        /* Sorted in ascending DLCI order */
 120         int dlci;
 121         int open_count;
 122
 123         struct {
 124                 unsigned int new: 1;
 125                 unsigned int active: 1;
 126                 unsigned int exist: 1;
 127                 unsigned int deleted: 1;
 128                 unsigned int fecn: 1;
 129                 unsigned int becn: 1;
 130                 unsigned int bandwidth; /* Cisco LMI reporting only */
 131         }state;
 132 };
 133
 134 struct frad_state {
 135         fr_proto settings;
 136         struct pvc_device *first_pvc;
 137         int dce_pvc_count;
 138
 139         struct timer_list timer;
 140         struct net_device *dev;
 141         unsigned long last_poll;
 142         int reliable;
 143         int dce_changed;
 144         int request;
 145         int fullrep_sent;
 146         u32 last_errors; /* last errors bit list */
 147         u8 n391cnt;
 148         u8 txseq; /* TX sequence number */
 149         u8 rxseq; /* RX sequence number */
 150 };
 151
 152
 153 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr);
 154
 155
 156 static inline u16 q922_to_dlci(u8 *hdr)
 157 {
 158         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 159 }
 160
 161
 162 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 163 {
 164         hdr[0] = (dlci >> 2) & 0xFC;
 165         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 166 }
 167
 168
 169 static inline struct frad_state* state(hdlc_device *hdlc)
 170 {
 171         return(struct frad_state *)(hdlc->state);
 172 }
 173
 174
 175 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci)
 176 {
 177         struct pvc_device *pvc = state(hdlc)->first_pvc;
 178
 179         while (pvc) {
 180                 if (pvc->dlci == dlci)
 181                         return pvc;
 182                 if (pvc->dlci > dlci)
 183                         return NULL; /* the list is sorted */
 184                 pvc = pvc->next;
 185         }
 186
 187         return NULL;
 188 }
 189
 190
 191 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci)
 192 {
 193         hdlc_device *hdlc = dev_to_hdlc(dev);
 194         struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc;
 195
 196         while (*pvc_p) {
 197                 if ((*pvc_p)->dlci == dlci)
 198                         return *pvc_p;
 199                 if ((*pvc_p)->dlci > dlci)
 200                         break;  /* the list is sorted */
 201                 pvc_p = &(*pvc_p)->next;
 202         }
 203
 204         pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC);
 205 #ifdef DEBUG_PVC
 206         printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev);
 207 #endif
 208         if (!pvc)
 209                 return NULL;
 210
 211         pvc->dlci = dlci;
 212         pvc->frad = dev;
 213         pvc->next = *pvc_p;     /* Put it in the chain */
 214         *pvc_p = pvc;
 215         return pvc;
 216 }
 217
 218
 219 static inline int pvc_is_used(struct pvc_device *pvc)
 220 {
 221         return pvc->main || pvc->ether;
 222 }
 223
 224
 225 static inline void pvc_carrier(int on, struct pvc_device *pvc)
 226 {
 227         if (on) {
 228                 if (pvc->main)
 229                         if (!netif_carrier_ok(pvc->main))
 230                                 netif_carrier_on(pvc->main);
 231                 if (pvc->ether)
 232                         if (!netif_carrier_ok(pvc->ether))
 233                                 netif_carrier_on(pvc->ether);
 234         } else {
 235                 if (pvc->main)
 236                         if (netif_carrier_ok(pvc->main))
 237                                 netif_carrier_off(pvc->main);
 238                 if (pvc->ether)
 239                         if (netif_carrier_ok(pvc->ether))
 240                                 netif_carrier_off(pvc->ether);
 241         }
 242 }
 243
 244
 245 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 246 {
 247         struct pvc_device **pvc_p = &state(hdlc)->first_pvc;
 248
 249         while (*pvc_p) {
 250                 if (!pvc_is_used(*pvc_p)) {
 251                         struct pvc_device *pvc = *pvc_p;
 252 #ifdef DEBUG_PVC
 253                         printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc);
 254 #endif
 255                         *pvc_p = pvc->next;
 256                         kfree(pvc);
 257                         continue;
 258                 }
 259                 pvc_p = &(*pvc_p)->next;
 260         }
 261 }
 262
 263
 264 static inline struct net_device **get_dev_p(struct pvc_device *pvc,
 265                                             int type)
 266 {
 267         if (type == ARPHRD_ETHER)
 268                 return &pvc->ether;
 269         else
 270                 return &pvc->main;
 271 }
 272
 273
 274 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 275 {
 276         u16 head_len;
 277         struct sk_buff *skb = *skb_p;
 278
 279         switch (skb->protocol) {
 280         case cpu_to_be16(NLPID_CCITT_ANSI_LMI):
 281                 head_len = 4;
 282                 skb_push(skb, head_len);
 283                 skb->data[3] = NLPID_CCITT_ANSI_LMI;
 284                 break;
 285
 286         case cpu_to_be16(NLPID_CISCO_LMI):
 287                 head_len = 4;
 288                 skb_push(skb, head_len);
 289                 skb->data[3] = NLPID_CISCO_LMI;
 290                 break;
 291
 292         case cpu_to_be16(ETH_P_IP):
 293                 head_len = 4;
 294                 skb_push(skb, head_len);
 295                 skb->data[3] = NLPID_IP;
 296                 break;
 297
 298         case cpu_to_be16(ETH_P_IPV6):
 299                 head_len = 4;
 300                 skb_push(skb, head_len);
 301                 skb->data[3] = NLPID_IPV6;
 302                 break;
 303
 304         case cpu_to_be16(ETH_P_802_3):
 305                 head_len = 10;
 306                 if (skb_headroom(skb) < head_len) {
 307                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 308                                                                     head_len);
 309                         if (!skb2)
 310                                 return -ENOBUFS;
 311                         dev_kfree_skb(skb);
 312                         skb = *skb_p = skb2;
 313                 }
 314                 skb_push(skb, head_len);
 315                 skb->data[3] = FR_PAD;
 316                 skb->data[4] = NLPID_SNAP;
 317                 skb->data[5] = FR_PAD;
 318                 skb->data[6] = 0x80;
 319                 skb->data[7] = 0xC2;
 320                 skb->data[8] = 0x00;
 321                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 322                 break;
 323
 324         default:
 325                 head_len = 10;
 326                 skb_push(skb, head_len);
 327                 skb->data[3] = FR_PAD;
 328                 skb->data[4] = NLPID_SNAP;
 329                 skb->data[5] = FR_PAD;
 330                 skb->data[6] = FR_PAD;
 331                 skb->data[7] = FR_PAD;
 332                 *(__be16*)(skb->data + 8) = skb->protocol;
 333         }
 334
 335         dlci_to_q922(skb->data, dlci);
 336         skb->data[2] = FR_UI;
 337         return 0;
 338 }
 339
 340
 341
 342 static int pvc_open(struct net_device *dev)
 343 {
 344         struct pvc_device *pvc = dev->ml_priv;
 345
 346         if ((pvc->frad->flags & IFF_UP) == 0)
 347                 return -EIO;  /* Frad must be UP in order to activate PVC */
 348
 349         if (pvc->open_count++ == 0) {
 350                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 351                 if (state(hdlc)->settings.lmi == LMI_NONE)
 352                         pvc->state.active = netif_carrier_ok(pvc->frad);
 353
 354                 pvc_carrier(pvc->state.active, pvc);
 355                 state(hdlc)->dce_changed = 1;
 356         }
 357         return 0;
 358 }
 359
 360
 361
 362 static int pvc_close(struct net_device *dev)
 363 {
 364         struct pvc_device *pvc = dev->ml_priv;
 365
 366         if (--pvc->open_count == 0) {
 367                 hdlc_device *hdlc = dev_to_hdlc(pvc->frad);
 368                 if (state(hdlc)->settings.lmi == LMI_NONE)
 369                         pvc->state.active = 0;
 370
 371                 if (state(hdlc)->settings.dce) {
 372                         state(hdlc)->dce_changed = 1;
 373                         pvc->state.active = 0;
 374                 }
 375         }
 376         return 0;
 377 }
 378
 379
 380
 381 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 382 {
 383         struct pvc_device *pvc = dev->ml_priv;
 384         fr_proto_pvc_info info;
 385
 386         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 387                 if (dev->type == ARPHRD_ETHER)
 388                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 389                 else
 390                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 391
 392                 if (ifr->ifr_settings.size < sizeof(info)) {
 393                         /* data size wanted */
 394                         ifr->ifr_settings.size = sizeof(info);
 395                         return -ENOBUFS;
 396                 }
 397
 398                 info.dlci = pvc->dlci;
 399                 memcpy(info.master, pvc->frad->name, IFNAMSIZ);
 400                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 401                                  &info, sizeof(info)))
 402                         return -EFAULT;
 403                 return 0;
 404         }
 405
 406         return -EINVAL;
 407 }
 408
 409 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 410 {
 411         struct pvc_device *pvc = dev->ml_priv;
 412
 413         if (pvc->state.active) {
 414                 if (dev->type == ARPHRD_ETHER) {
 415                         int pad = ETH_ZLEN - skb->len;
 416                         if (pad > 0) { /* Pad the frame with zeros */
 417                                 int len = skb->len;
 418                                 if (skb_tailroom(skb) < pad)
 419                                         if (pskb_expand_head(skb, 0, pad,
 420                                                              GFP_ATOMIC)) {
 421                                                 dev->stats.tx_dropped++;
 422                                                 dev_kfree_skb(skb);
 423                                                 return NETDEV_TX_OK;
 424                                         }
 425                                 skb_put(skb, pad);
 426                                 memset(skb->data + len, 0, pad);
 427                         }
 428                         skb->protocol = cpu_to_be16(ETH_P_802_3);
 429                 }
 430                 if (!fr_hard_header(&skb, pvc->dlci)) {
 431                         dev->stats.tx_bytes += skb->len;
 432                         dev->stats.tx_packets++;
 433                         if (pvc->state.fecn) /* TX Congestion counter */
 434                                 dev->stats.tx_compressed++;
 435                         skb->dev = pvc->frad;
 436                         skb->protocol = htons(ETH_P_HDLC);
 437                         skb_reset_network_header(skb);
 438                         dev_queue_xmit(skb);
 439                         return NETDEV_TX_OK;
 440                 }
 441         }
 442
 443         dev->stats.tx_dropped++;
 444         dev_kfree_skb(skb);
 445         return NETDEV_TX_OK;
 446 }
 447
 448 static inline void fr_log_dlci_active(struct pvc_device *pvc)
 449 {
 450         netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n",
 451                     pvc->dlci,
 452                     pvc->main ? pvc->main->name : "",
 453                     pvc->main && pvc->ether ? " " : "",
 454                     pvc->ether ? pvc->ether->name : "",
 455                     pvc->state.new ? " new" : "",
 456                     !pvc->state.exist ? "deleted" :
 457                     pvc->state.active ? "active" : "inactive");
 458 }
 459
 460
 461
 462 static inline u8 fr_lmi_nextseq(u8 x)
 463 {
 464         x++;
 465         return x ? x : 1;
 466 }
 467
 468
 469 static void fr_lmi_send(struct net_device *dev, int fullrep)
 470 {
 471         hdlc_device *hdlc = dev_to_hdlc(dev);
 472         struct sk_buff *skb;
 473         struct pvc_device *pvc = state(hdlc)->first_pvc;
 474         int lmi = state(hdlc)->settings.lmi;
 475         int dce = state(hdlc)->settings.dce;
 476         int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH;
 477         int stat_len = (lmi == LMI_CISCO) ? 6 : 3;
 478         u8 *data;
 479         int i = 0;
 480
 481         if (dce && fullrep) {
 482                 len += state(hdlc)->dce_pvc_count * (2 + stat_len);
 483                 if (len > HDLC_MAX_MRU) {
 484                         netdev_warn(dev, "Too many PVCs while sending LMI full report\n");
 485                         return;
 486                 }
 487         }
 488
 489         skb = dev_alloc_skb(len);
 490         if (!skb) {
 491                 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n");
 492                 return;
 493         }
 494         memset(skb->data, 0, len);
 495         skb_reserve(skb, 4);
 496         if (lmi == LMI_CISCO) {
 497                 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI);
 498                 fr_hard_header(&skb, LMI_CISCO_DLCI);
 499         } else {
 500                 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI);
 501                 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI);
 502         }
 503         data = skb_tail_pointer(skb);
 504         data[i++] = LMI_CALLREF;
 505         data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 506         if (lmi == LMI_ANSI)
 507                 data[i++] = LMI_ANSI_LOCKSHIFT;
 508         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 509                 LMI_ANSI_CISCO_REPTYPE;
 510         data[i++] = LMI_REPT_LEN;
 511         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 512         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE;
 513         data[i++] = LMI_INTEG_LEN;
 514         data[i++] = state(hdlc)->txseq =
 515                 fr_lmi_nextseq(state(hdlc)->txseq);
 516         data[i++] = state(hdlc)->rxseq;
 517
 518         if (dce && fullrep) {
 519                 while (pvc) {
 520                         data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 521                                 LMI_ANSI_CISCO_PVCSTAT;
 522                         data[i++] = stat_len;
 523
 524                         /* LMI start/restart */
 525                         if (state(hdlc)->reliable && !pvc->state.exist) {
 526                                 pvc->state.exist = pvc->state.new = 1;
 527                                 fr_log_dlci_active(pvc);
 528                         }
 529
 530                         /* ifconfig PVC up */
 531                         if (pvc->open_count && !pvc->state.active &&
 532                             pvc->state.exist && !pvc->state.new) {
 533                                 pvc_carrier(1, pvc);
 534                                 pvc->state.active = 1;
 535                                 fr_log_dlci_active(pvc);
 536                         }
 537
 538                         if (lmi == LMI_CISCO) {
 539                                 data[i] = pvc->dlci >> 8;
 540                                 data[i + 1] = pvc->dlci & 0xFF;
 541                         } else {
 542                                 data[i] = (pvc->dlci >> 4) & 0x3F;
 543                                 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80;
 544                                 data[i + 2] = 0x80;
 545                         }
 546
 547                         if (pvc->state.new)
 548                                 data[i + 2] |= 0x08;
 549                         else if (pvc->state.active)
 550                                 data[i + 2] |= 0x02;
 551
 552                         i += stat_len;
 553                         pvc = pvc->next;
 554                 }
 555         }
 556
 557         skb_put(skb, i);
 558         skb->priority = TC_PRIO_CONTROL;
 559         skb->dev = dev;
 560         skb->protocol = htons(ETH_P_HDLC);
 561         skb_reset_network_header(skb);
 562
 563         dev_queue_xmit(skb);
 564 }
 565
 566
 567
 568 static void fr_set_link_state(int reliable, struct net_device *dev)
 569 {
 570         hdlc_device *hdlc = dev_to_hdlc(dev);
 571         struct pvc_device *pvc = state(hdlc)->first_pvc;
 572
 573         state(hdlc)->reliable = reliable;
 574         if (reliable) {
 575                 netif_dormant_off(dev);
 576                 state(hdlc)->n391cnt = 0; /* Request full status */
 577                 state(hdlc)->dce_changed = 1;
 578
 579                 if (state(hdlc)->settings.lmi == LMI_NONE) {
 580                         while (pvc) {   /* Activate all PVCs */
 581                                 pvc_carrier(1, pvc);
 582                                 pvc->state.exist = pvc->state.active = 1;
 583                                 pvc->state.new = 0;
 584                                 pvc = pvc->next;
 585                         }
 586                 }
 587         } else {
 588                 netif_dormant_on(dev);
 589                 while (pvc) {           /* Deactivate all PVCs */
 590                         pvc_carrier(0, pvc);
 591                         pvc->state.exist = pvc->state.active = 0;
 592                         pvc->state.new = 0;
 593                         if (!state(hdlc)->settings.dce)
 594                                 pvc->state.bandwidth = 0;
 595                         pvc = pvc->next;
 596                 }
 597         }
 598 }
 599
 600
 601 static void fr_timer(struct timer_list *t)
 602 {
 603         struct frad_state *st = from_timer(st, t, timer);
 604         struct net_device *dev = st->dev;
 605         hdlc_device *hdlc = dev_to_hdlc(dev);
 606         int i, cnt = 0, reliable;
 607         u32 list;
 608
 609         if (state(hdlc)->settings.dce) {
 610                 reliable = state(hdlc)->request &&
 611                         time_before(jiffies, state(hdlc)->last_poll +
 612                                     state(hdlc)->settings.t392 * HZ);
 613                 state(hdlc)->request = 0;
 614         } else {
 615                 state(hdlc)->last_errors <<= 1; /* Shift the list */
 616                 if (state(hdlc)->request) {
 617                         if (state(hdlc)->reliable)
 618                                 netdev_info(dev, "No LMI status reply received\n");
 619                         state(hdlc)->last_errors |= 1;
 620                 }
 621
 622                 list = state(hdlc)->last_errors;
 623                 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1)
 624                         cnt += (list & 1);      /* errors count */
 625
 626                 reliable = (cnt < state(hdlc)->settings.n392);
 627         }
 628
 629         if (state(hdlc)->reliable != reliable) {
 630                 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un");
 631                 fr_set_link_state(reliable, dev);
 632         }
 633
 634         if (state(hdlc)->settings.dce)
 635                 state(hdlc)->timer.expires = jiffies +
 636                         state(hdlc)->settings.t392 * HZ;
 637         else {
 638                 if (state(hdlc)->n391cnt)
 639                         state(hdlc)->n391cnt--;
 640
 641                 fr_lmi_send(dev, state(hdlc)->n391cnt == 0);
 642
 643                 state(hdlc)->last_poll = jiffies;
 644                 state(hdlc)->request = 1;
 645                 state(hdlc)->timer.expires = jiffies +
 646                         state(hdlc)->settings.t391 * HZ;
 647         }
 648
 649         add_timer(&state(hdlc)->timer);
 650 }
 651
 652
 653 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 654 {
 655         hdlc_device *hdlc = dev_to_hdlc(dev);
 656         struct pvc_device *pvc;
 657         u8 rxseq, txseq;
 658         int lmi = state(hdlc)->settings.lmi;
 659         int dce = state(hdlc)->settings.dce;
 660         int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i;
 661
 662         if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH :
 663                         LMI_CCITT_CISCO_LENGTH)) {
 664                 netdev_info(dev, "Short LMI frame\n");
 665                 return 1;
 666         }
 667
 668         if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI :
 669                              NLPID_CCITT_ANSI_LMI)) {
 670                 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n");
 671                 return 1;
 672         }
 673
 674         if (skb->data[4] != LMI_CALLREF) {
 675                 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n",
 676                             skb->data[4]);
 677                 return 1;
 678         }
 679
 680         if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) {
 681                 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n",
 682                             skb->data[5]);
 683                 return 1;
 684         }
 685
 686         if (lmi == LMI_ANSI) {
 687                 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) {
 688                         netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n",
 689                                     skb->data[6]);
 690                         return 1;
 691                 }
 692                 i = 7;
 693         } else
 694                 i = 6;
 695
 696         if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE :
 697                              LMI_ANSI_CISCO_REPTYPE)) {
 698                 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n",
 699                             skb->data[i]);
 700                 return 1;
 701         }
 702
 703         if (skb->data[++i] != LMI_REPT_LEN) {
 704                 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n",
 705                             skb->data[i]);
 706                 return 1;
 707         }
 708
 709         reptype = skb->data[++i];
 710         if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) {
 711                 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n",
 712                             reptype);
 713                 return 1;
 714         }
 715
 716         if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE :
 717                                LMI_ANSI_CISCO_ALIVE)) {
 718                 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n",
 719                             skb->data[i]);
 720                 return 1;
 721         }
 722
 723         if (skb->data[++i] != LMI_INTEG_LEN) {
 724                 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n",
 725                             skb->data[i]);
 726                 return 1;
 727         }
 728         i++;
 729
 730         state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */
 731         rxseq = skb->data[i++]; /* Should confirm our sequence */
 732
 733         txseq = state(hdlc)->txseq;
 734
 735         if (dce)
 736                 state(hdlc)->last_poll = jiffies;
 737
 738         error = 0;
 739         if (!state(hdlc)->reliable)
 740                 error = 1;
 741
 742         if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */
 743                 state(hdlc)->n391cnt = 0;
 744                 error = 1;
 745         }
 746
 747         if (dce) {
 748                 if (state(hdlc)->fullrep_sent && !error) {
 749 /* Stop sending full report - the last one has been confirmed by DTE */
 750                         state(hdlc)->fullrep_sent = 0;
 751                         pvc = state(hdlc)->first_pvc;
 752                         while (pvc) {
 753                                 if (pvc->state.new) {
 754                                         pvc->state.new = 0;
 755
 756 /* Tell DTE that new PVC is now active */
 757                                         state(hdlc)->dce_changed = 1;
 758                                 }
 759                                 pvc = pvc->next;
 760                         }
 761                 }
 762
 763                 if (state(hdlc)->dce_changed) {
 764                         reptype = LMI_FULLREP;
 765                         state(hdlc)->fullrep_sent = 1;
 766                         state(hdlc)->dce_changed = 0;
 767                 }
 768
 769                 state(hdlc)->request = 1; /* got request */
 770                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 771                 return 0;
 772         }
 773
 774         /* DTE */
 775
 776         state(hdlc)->request = 0; /* got response, no request pending */
 777
 778         if (error)
 779                 return 0;
 780
 781         if (reptype != LMI_FULLREP)
 782                 return 0;
 783
 784         pvc = state(hdlc)->first_pvc;
 785
 786         while (pvc) {
 787                 pvc->state.deleted = 1;
 788                 pvc = pvc->next;
 789         }
 790
 791         no_ram = 0;
 792         while (skb->len >= i + 2 + stat_len) {
 793                 u16 dlci;
 794                 u32 bw;
 795                 unsigned int active, new;
 796
 797                 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT :
 798                                        LMI_ANSI_CISCO_PVCSTAT)) {
 799                         netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n",
 800                                     skb->data[i]);
 801                         return 1;
 802                 }
 803
 804                 if (skb->data[++i] != stat_len) {
 805                         netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n",
 806                                     skb->data[i]);
 807                         return 1;
 808                 }
 809                 i++;
 810
 811                 new = !! (skb->data[i + 2] & 0x08);
 812                 active = !! (skb->data[i + 2] & 0x02);
 813                 if (lmi == LMI_CISCO) {
 814                         dlci = (skb->data[i] << 8) | skb->data[i + 1];
 815                         bw = (skb->data[i + 3] << 16) |
 816                                 (skb->data[i + 4] << 8) |
 817                                 (skb->data[i + 5]);
 818                 } else {
 819                         dlci = ((skb->data[i] & 0x3F) << 4) |
 820                                 ((skb->data[i + 1] & 0x78) >> 3);
 821                         bw = 0;
 822                 }
 823
 824                 pvc = add_pvc(dev, dlci);
 825
 826                 if (!pvc && !no_ram) {
 827                         netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n");
 828                         no_ram = 1;
 829                 }
 830
 831                 if (pvc) {
 832                         pvc->state.exist = 1;
 833                         pvc->state.deleted = 0;
 834                         if (active != pvc->state.active ||
 835                             new != pvc->state.new ||
 836                             bw != pvc->state.bandwidth ||
 837                             !pvc->state.exist) {
 838                                 pvc->state.new = new;
 839                                 pvc->state.active = active;
 840                                 pvc->state.bandwidth = bw;
 841                                 pvc_carrier(active, pvc);
 842                                 fr_log_dlci_active(pvc);
 843                         }
 844                 }
 845
 846                 i += stat_len;
 847         }
 848
 849         pvc = state(hdlc)->first_pvc;
 850
 851         while (pvc) {
 852                 if (pvc->state.deleted && pvc->state.exist) {
 853                         pvc_carrier(0, pvc);
 854                         pvc->state.active = pvc->state.new = 0;
 855                         pvc->state.exist = 0;
 856                         pvc->state.bandwidth = 0;
 857                         fr_log_dlci_active(pvc);
 858                 }
 859                 pvc = pvc->next;
 860         }
 861
 862         /* Next full report after N391 polls */
 863         state(hdlc)->n391cnt = state(hdlc)->settings.n391;
 864
 865         return 0;
 866 }
 867
 868
 869 static int fr_rx(struct sk_buff *skb)
 870 {
 871         struct net_device *frad = skb->dev;
 872         hdlc_device *hdlc = dev_to_hdlc(frad);
 873         struct fr_hdr *fh = (struct fr_hdr *)skb->data;
 874         u8 *data = skb->data;
 875         u16 dlci;
 876         struct pvc_device *pvc;
 877         struct net_device *dev = NULL;
 878
 879         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 880                 goto rx_error;
 881
 882         dlci = q922_to_dlci(skb->data);
 883
 884         if ((dlci == LMI_CCITT_ANSI_DLCI &&
 885              (state(hdlc)->settings.lmi == LMI_ANSI ||
 886               state(hdlc)->settings.lmi == LMI_CCITT)) ||
 887             (dlci == LMI_CISCO_DLCI &&
 888              state(hdlc)->settings.lmi == LMI_CISCO)) {
 889                 if (fr_lmi_recv(frad, skb))
 890                         goto rx_error;
 891                 dev_kfree_skb_any(skb);
 892                 return NET_RX_SUCCESS;
 893         }
 894
 895         pvc = find_pvc(hdlc, dlci);
 896         if (!pvc) {
 897 #ifdef DEBUG_PKT
 898                 netdev_info(frad, "No PVC for received frame's DLCI %d\n",
 899                             dlci);
 900 #endif
 901                 dev_kfree_skb_any(skb);
 902                 return NET_RX_DROP;
 903         }
 904
 905         if (pvc->state.fecn != fh->fecn) {
 906 #ifdef DEBUG_ECN
 907                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name,
 908                        dlci, fh->fecn ? "N" : "FF");
 909 #endif
 910                 pvc->state.fecn ^= 1;
 911         }
 912
 913         if (pvc->state.becn != fh->becn) {
 914 #ifdef DEBUG_ECN
 915                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name,
 916                        dlci, fh->becn ? "N" : "FF");
 917 #endif
 918                 pvc->state.becn ^= 1;
 919         }
 920
 921
 922         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 923                 frad->stats.rx_dropped++;
 924                 return NET_RX_DROP;
 925         }
 926
 927         if (data[3] == NLPID_IP) {
 928                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 929                 dev = pvc->main;
 930                 skb->protocol = htons(ETH_P_IP);
 931
 932         } else if (data[3] == NLPID_IPV6) {
 933                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 934                 dev = pvc->main;
 935                 skb->protocol = htons(ETH_P_IPV6);
 936
 937         } else if (skb->len > 10 && data[3] == FR_PAD &&
 938                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 939                 u16 oui = ntohs(*(__be16*)(data + 6));
 940                 u16 pid = ntohs(*(__be16*)(data + 8));
 941                 skb_pull(skb, 10);
 942
 943                 switch ((((u32)oui) << 16) | pid) {
 944                 case ETH_P_ARP: /* routed frame with SNAP */
 945                 case ETH_P_IPX:
 946                 case ETH_P_IP:  /* a long variant */
 947                 case ETH_P_IPV6:
 948                         dev = pvc->main;
 949                         skb->protocol = htons(pid);
 950                         break;
 951
 952                 case 0x80C20007: /* bridged Ethernet frame */
 953                         if ((dev = pvc->ether) != NULL)
 954                                 skb->protocol = eth_type_trans(skb, dev);
 955                         break;
 956
 957                 default:
 958                         netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n",
 959                                     oui, pid);
 960                         dev_kfree_skb_any(skb);
 961                         return NET_RX_DROP;
 962                 }
 963         } else {
 964                 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n",
 965                             data[3], skb->len);
 966                 dev_kfree_skb_any(skb);
 967                 return NET_RX_DROP;
 968         }
 969
 970         if (dev) {
 971                 dev->stats.rx_packets++; /* PVC traffic */
 972                 dev->stats.rx_bytes += skb->len;
 973                 if (pvc->state.becn)
 974                         dev->stats.rx_compressed++;
 975                 skb->dev = dev;
 976                 netif_rx(skb);
 977                 return NET_RX_SUCCESS;
 978         } else {
 979                 dev_kfree_skb_any(skb);
 980                 return NET_RX_DROP;
 981         }
 982
 983  rx_error:
 984         frad->stats.rx_errors++; /* Mark error */
 985         dev_kfree_skb_any(skb);
 986         return NET_RX_DROP;
 987 }
 988
 989
 990
 991 static void fr_start(struct net_device *dev)
 992 {
 993         hdlc_device *hdlc = dev_to_hdlc(dev);
 994 #ifdef DEBUG_LINK
 995         printk(KERN_DEBUG "fr_start\n");
 996 #endif
 997         if (state(hdlc)->settings.lmi != LMI_NONE) {
 998                 state(hdlc)->reliable = 0;
 999                 state(hdlc)->dce_changed = 1;
1000                 state(hdlc)->request = 0;
1001                 state(hdlc)->fullrep_sent = 0;
1002                 state(hdlc)->last_errors = 0xFFFFFFFF;
1003                 state(hdlc)->n391cnt = 0;
1004                 state(hdlc)->txseq = state(hdlc)->rxseq = 0;
1005
1006                 state(hdlc)->dev = dev;
1007                 timer_setup(&state(hdlc)->timer, fr_timer, 0);
1008                 /* First poll after 1 s */
1009                 state(hdlc)->timer.expires = jiffies + HZ;
1010                 add_timer(&state(hdlc)->timer);
1011         } else
1012                 fr_set_link_state(1, dev);
1013 }
1014
1015
1016 static void fr_stop(struct net_device *dev)
1017 {
1018         hdlc_device *hdlc = dev_to_hdlc(dev);
1019 #ifdef DEBUG_LINK
1020         printk(KERN_DEBUG "fr_stop\n");
1021 #endif
1022         if (state(hdlc)->settings.lmi != LMI_NONE)
1023                 del_timer_sync(&state(hdlc)->timer);
1024         fr_set_link_state(0, dev);
1025 }
1026
1027
1028 static void fr_close(struct net_device *dev)
1029 {
1030         hdlc_device *hdlc = dev_to_hdlc(dev);
1031         struct pvc_device *pvc = state(hdlc)->first_pvc;
1032
1033         while (pvc) {           /* Shutdown all PVCs for this FRAD */
1034                 if (pvc->main)
1035                         dev_close(pvc->main);
1036                 if (pvc->ether)
1037                         dev_close(pvc->ether);
1038                 pvc = pvc->next;
1039         }
1040 }
1041
1042
1043 static void pvc_setup(struct net_device *dev)
1044 {
1045         dev->type = ARPHRD_DLCI;
1046         dev->flags = IFF_POINTOPOINT;
1047         dev->hard_header_len = 0;
1048         dev->addr_len = 2;
1049         netif_keep_dst(dev);
1050 }
1051
1052 static const struct net_device_ops pvc_ops = {
1053         .ndo_open       = pvc_open,
1054         .ndo_stop       = pvc_close,
1055         .ndo_start_xmit = pvc_xmit,
1056         .ndo_do_ioctl   = pvc_ioctl,
1057 };
1058
1059 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type)
1060 {
1061         hdlc_device *hdlc = dev_to_hdlc(frad);
1062         struct pvc_device *pvc;
1063         struct net_device *dev;
1064         int used;
1065
1066         if ((pvc = add_pvc(frad, dlci)) == NULL) {
1067                 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n");
1068                 return -ENOBUFS;
1069         }
1070
1071         if (*get_dev_p(pvc, type))
1072                 return -EEXIST;
1073
1074         used = pvc_is_used(pvc);
1075
1076         if (type == ARPHRD_ETHER)
1077                 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN,
1078                                    ether_setup);
1079         else
1080                 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup);
1081
1082         if (!dev) {
1083                 netdev_warn(frad, "Memory squeeze on fr_pvc()\n");
1084                 delete_unused_pvcs(hdlc);
1085                 return -ENOBUFS;
1086         }
1087
1088         if (type == ARPHRD_ETHER) {
1089                 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1090                 eth_hw_addr_random(dev);
1091         } else {
1092                 *(__be16*)dev->dev_addr = htons(dlci);
1093                 dlci_to_q922(dev->broadcast, dlci);
1094         }
1095         dev->netdev_ops = &pvc_ops;
1096         dev->mtu = HDLC_MAX_MTU;
1097         dev->min_mtu = 68;
1098         dev->max_mtu = HDLC_MAX_MTU;
1099         dev->needed_headroom = 10;
1100         dev->priv_flags |= IFF_NO_QUEUE;
1101         dev->ml_priv = pvc;
1102
1103         if (register_netdevice(dev) != 0) {
1104                 free_netdev(dev);
1105                 delete_unused_pvcs(hdlc);
1106                 return -EIO;
1107         }
1108
1109         dev->needs_free_netdev = true;
1110         *get_dev_p(pvc, type) = dev;
1111         if (!used) {
1112                 state(hdlc)->dce_changed = 1;
1113                 state(hdlc)->dce_pvc_count++;
1114         }
1115         return 0;
1116 }
1117
1118
1119
1120 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1121 {
1122         struct pvc_device *pvc;
1123         struct net_device *dev;
1124
1125         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1126                 return -ENOENT;
1127
1128         if ((dev = *get_dev_p(pvc, type)) == NULL)
1129                 return -ENOENT;
1130
1131         if (dev->flags & IFF_UP)
1132                 return -EBUSY;          /* PVC in use */
1133
1134         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1135         *get_dev_p(pvc, type) = NULL;
1136
1137         if (!pvc_is_used(pvc)) {
1138                 state(hdlc)->dce_pvc_count--;
1139                 state(hdlc)->dce_changed = 1;
1140         }
1141         delete_unused_pvcs(hdlc);
1142         return 0;
1143 }
1144
1145
1146
1147 static void fr_destroy(struct net_device *frad)
1148 {
1149         hdlc_device *hdlc = dev_to_hdlc(frad);
1150         struct pvc_device *pvc = state(hdlc)->first_pvc;
1151         state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */
1152         state(hdlc)->dce_pvc_count = 0;
1153         state(hdlc)->dce_changed = 1;
1154
1155         while (pvc) {
1156                 struct pvc_device *next = pvc->next;
1157                 /* destructors will free_netdev() main and ether */
1158                 if (pvc->main)
1159                         unregister_netdevice(pvc->main);
1160
1161                 if (pvc->ether)
1162                         unregister_netdevice(pvc->ether);
1163
1164                 kfree(pvc);
1165                 pvc = next;
1166         }
1167 }
1168
1169
1170 static struct hdlc_proto proto = {
1171         .close          = fr_close,
1172         .start          = fr_start,
1173         .stop           = fr_stop,
1174         .detach         = fr_destroy,
1175         .ioctl          = fr_ioctl,
1176         .netif_rx       = fr_rx,
1177         .module         = THIS_MODULE,
1178 };
1179
1180
1181 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1182 {
1183         fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1184         const size_t size = sizeof(fr_proto);
1185         fr_proto new_settings;
1186         hdlc_device *hdlc = dev_to_hdlc(dev);
1187         fr_proto_pvc pvc;
1188         int result;
1189
1190         switch (ifr->ifr_settings.type) {
1191         case IF_GET_PROTO:
1192                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1193                         return -EINVAL;
1194                 ifr->ifr_settings.type = IF_PROTO_FR;
1195                 if (ifr->ifr_settings.size < size) {
1196                         ifr->ifr_settings.size = size; /* data size wanted */
1197                         return -ENOBUFS;
1198                 }
1199                 if (copy_to_user(fr_s, &state(hdlc)->settings, size))
1200                         return -EFAULT;
1201                 return 0;
1202
1203         case IF_PROTO_FR:
1204                 if (!capable(CAP_NET_ADMIN))
1205                         return -EPERM;
1206
1207                 if (dev->flags & IFF_UP)
1208                         return -EBUSY;
1209
1210                 if (copy_from_user(&new_settings, fr_s, size))
1211                         return -EFAULT;
1212
1213                 if (new_settings.lmi == LMI_DEFAULT)
1214                         new_settings.lmi = LMI_ANSI;
1215
1216                 if ((new_settings.lmi != LMI_NONE &&
1217                      new_settings.lmi != LMI_ANSI &&
1218                      new_settings.lmi != LMI_CCITT &&
1219                      new_settings.lmi != LMI_CISCO) ||
1220                     new_settings.t391 < 1 ||
1221                     new_settings.t392 < 2 ||
1222                     new_settings.n391 < 1 ||
1223                     new_settings.n392 < 1 ||
1224                     new_settings.n393 < new_settings.n392 ||
1225                     new_settings.n393 > 32 ||
1226                     (new_settings.dce != 0 &&
1227                      new_settings.dce != 1))
1228                         return -EINVAL;
1229
1230                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1231                 if (result)
1232                         return result;
1233
1234                 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */
1235                         result = attach_hdlc_protocol(dev, &proto,
1236                                                       sizeof(struct frad_state));
1237                         if (result)
1238                                 return result;
1239                         state(hdlc)->first_pvc = NULL;
1240                         state(hdlc)->dce_pvc_count = 0;
1241                 }
1242                 memcpy(&state(hdlc)->settings, &new_settings, size);
1243                 dev->type = ARPHRD_FRAD;
1244                 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev);
1245                 return 0;
1246
1247         case IF_PROTO_FR_ADD_PVC:
1248         case IF_PROTO_FR_DEL_PVC:
1249         case IF_PROTO_FR_ADD_ETH_PVC:
1250         case IF_PROTO_FR_DEL_ETH_PVC:
1251                 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */
1252                         return -EINVAL;
1253
1254                 if (!capable(CAP_NET_ADMIN))
1255                         return -EPERM;
1256
1257                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1258                                    sizeof(fr_proto_pvc)))
1259                         return -EFAULT;
1260
1261                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1262                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1263
1264                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1265                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1266                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1267                 else
1268                         result = ARPHRD_DLCI;
1269
1270                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1271                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1272                         return fr_add_pvc(dev, pvc.dlci, result);
1273                 else
1274                         return fr_del_pvc(hdlc, pvc.dlci, result);
1275         }
1276
1277         return -EINVAL;
1278 }
1279
1280
1281 static int __init mod_init(void)
1282 {
1283         register_hdlc_protocol(&proto);
1284         return 0;
1285 }
1286
1287
1288 static void __exit mod_exit(void)
1289 {
1290         unregister_hdlc_protocol(&proto);
1291 }
1292
1293
1294 module_init(mod_init);
1295 module_exit(mod_exit);
1296
1297 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
1298 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC");
1299 MODULE_LICENSE("GPL v2");