drivers/net/wan/hdlc_fr.c

   1 /*
   2  * Generic HDLC support routines for Linux
   3  * Frame Relay support
   4  *
   5  * Copyright (C) 1999 - 2003 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 */
  31
  32 #include <linux/module.h>
  33 #include <linux/kernel.h>
  34 #include <linux/slab.h>
  35 #include <linux/poll.h>
  36 #include <linux/errno.h>
  37 #include <linux/if_arp.h>
  38 #include <linux/init.h>
  39 #include <linux/skbuff.h>
  40 #include <linux/pkt_sched.h>
  41 #include <linux/random.h>
  42 #include <linux/inetdevice.h>
  43 #include <linux/lapb.h>
  44 #include <linux/rtnetlink.h>
  45 #include <linux/etherdevice.h>
  46 #include <linux/hdlc.h>
  47
  48 #undef DEBUG_PKT
  49 #undef DEBUG_ECN
  50 #undef DEBUG_LINK
  51
  52 #define MAXLEN_LMISTAT  20      /* max size of status enquiry frame */
  53
  54 #define PVC_STATE_NEW    0x01
  55 #define PVC_STATE_ACTIVE 0x02
  56 #define PVC_STATE_FECN   0x08 /* FECN condition */
  57 #define PVC_STATE_BECN   0x10 /* BECN condition */
  58
  59
  60 #define FR_UI            0x03
  61 #define FR_PAD           0x00
  62
  63 #define NLPID_IP         0xCC
  64 #define NLPID_IPV6       0x8E
  65 #define NLPID_SNAP       0x80
  66 #define NLPID_PAD        0x00
  67 #define NLPID_Q933       0x08
  68
  69
  70 #define LMI_DLCI                   0 /* LMI DLCI */
  71 #define LMI_PROTO               0x08
  72 #define LMI_CALLREF             0x00 /* Call Reference */
  73 #define LMI_ANSI_LOCKSHIFT      0x95 /* ANSI lockshift */
  74 #define LMI_REPTYPE                1 /* report type */
  75 #define LMI_CCITT_REPTYPE       0x51
  76 #define LMI_ALIVE                  3 /* keep alive */
  77 #define LMI_CCITT_ALIVE         0x53
  78 #define LMI_PVCSTAT                7 /* pvc status */
  79 #define LMI_CCITT_PVCSTAT       0x57
  80 #define LMI_FULLREP                0 /* full report  */
  81 #define LMI_INTEGRITY              1 /* link integrity report */
  82 #define LMI_SINGLE                 2 /* single pvc report */
  83 #define LMI_STATUS_ENQUIRY      0x75
  84 #define LMI_STATUS              0x7D /* reply */
  85
  86 #define LMI_REPT_LEN               1 /* report type element length */
  87 #define LMI_INTEG_LEN              2 /* link integrity element length */
  88
  89 #define LMI_LENGTH                13 /* standard LMI frame length */
  90 #define LMI_ANSI_LENGTH           14
  91
  92
  93 typedef struct {
  94 #if defined(__LITTLE_ENDIAN_BITFIELD)
  95         unsigned ea1:   1;
  96         unsigned cr:    1;
  97         unsigned dlcih: 6;
  98
  99         unsigned ea2:   1;
 100         unsigned de:    1;
 101         unsigned becn:  1;
 102         unsigned fecn:  1;
 103         unsigned dlcil: 4;
 104 #else
 105         unsigned dlcih: 6;
 106         unsigned cr:    1;
 107         unsigned ea1:   1;
 108
 109         unsigned dlcil: 4;
 110         unsigned fecn:  1;
 111         unsigned becn:  1;
 112         unsigned de:    1;
 113         unsigned ea2:   1;
 114 #endif
 115 }__attribute__ ((packed)) fr_hdr;
 116
 117
 118 static inline u16 q922_to_dlci(u8 *hdr)
 119 {
 120         return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4);
 121 }
 122
 123
 124
 125 static inline void dlci_to_q922(u8 *hdr, u16 dlci)
 126 {
 127         hdr[0] = (dlci >> 2) & 0xFC;
 128         hdr[1] = ((dlci << 4) & 0xF0) | 0x01;
 129 }
 130
 131
 132
 133 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci)
 134 {
 135         pvc_device *pvc = hdlc->state.fr.first_pvc;
 136
 137         while (pvc) {
 138                 if (pvc->dlci == dlci)
 139                         return pvc;
 140                 if (pvc->dlci > dlci)
 141                         return NULL; /* the listed is sorted */
 142                 pvc = pvc->next;
 143         }
 144
 145         return NULL;
 146 }
 147
 148
 149 static inline pvc_device* add_pvc(struct net_device *dev, u16 dlci)
 150 {
 151         hdlc_device *hdlc = dev_to_hdlc(dev);
 152         pvc_device *pvc, **pvc_p = &hdlc->state.fr.first_pvc;
 153
 154         while (*pvc_p) {
 155                 if ((*pvc_p)->dlci == dlci)
 156                         return *pvc_p;
 157                 if ((*pvc_p)->dlci > dlci)
 158                         break;  /* the list is sorted */
 159                 pvc_p = &(*pvc_p)->next;
 160         }
 161
 162         pvc = kmalloc(sizeof(pvc_device), GFP_ATOMIC);
 163         if (!pvc)
 164                 return NULL;
 165
 166         memset(pvc, 0, sizeof(pvc_device));
 167         pvc->dlci = dlci;
 168         pvc->master = dev;
 169         pvc->next = *pvc_p;     /* Put it in the chain */
 170         *pvc_p = pvc;
 171         return pvc;
 172 }
 173
 174
 175 static inline int pvc_is_used(pvc_device *pvc)
 176 {
 177         return pvc->main != NULL || pvc->ether != NULL;
 178 }
 179
 180
 181 static inline void pvc_carrier(int on, pvc_device *pvc)
 182 {
 183         if (on) {
 184                 if (pvc->main)
 185                         if (!netif_carrier_ok(pvc->main))
 186                                 netif_carrier_on(pvc->main);
 187                 if (pvc->ether)
 188                         if (!netif_carrier_ok(pvc->ether))
 189                                 netif_carrier_on(pvc->ether);
 190         } else {
 191                 if (pvc->main)
 192                         if (netif_carrier_ok(pvc->main))
 193                                 netif_carrier_off(pvc->main);
 194                 if (pvc->ether)
 195                         if (netif_carrier_ok(pvc->ether))
 196                                 netif_carrier_off(pvc->ether);
 197         }
 198 }
 199
 200
 201 static inline void delete_unused_pvcs(hdlc_device *hdlc)
 202 {
 203         pvc_device **pvc_p = &hdlc->state.fr.first_pvc;
 204
 205         while (*pvc_p) {
 206                 if (!pvc_is_used(*pvc_p)) {
 207                         pvc_device *pvc = *pvc_p;
 208                         *pvc_p = pvc->next;
 209                         kfree(pvc);
 210                         continue;
 211                 }
 212                 pvc_p = &(*pvc_p)->next;
 213         }
 214 }
 215
 216
 217 static inline struct net_device** get_dev_p(pvc_device *pvc, int type)
 218 {
 219         if (type == ARPHRD_ETHER)
 220                 return &pvc->ether;
 221         else
 222                 return &pvc->main;
 223 }
 224
 225
 226 static inline u16 status_to_dlci(u8 *status, int *active, int *new)
 227 {
 228         *new = (status[2] & 0x08) ? 1 : 0;
 229         *active = (status[2] & 0x02) ? 1 : 0;
 230
 231         return ((status[0] & 0x3F) << 4) | ((status[1] & 0x78) >> 3);
 232 }
 233
 234
 235 static inline void dlci_to_status(u16 dlci, u8 *status, int active, int new)
 236 {
 237         status[0] = (dlci >> 4) & 0x3F;
 238         status[1] = ((dlci << 3) & 0x78) | 0x80;
 239         status[2] = 0x80;
 240
 241         if (new)
 242                 status[2] |= 0x08;
 243         else if (active)
 244                 status[2] |= 0x02;
 245 }
 246
 247
 248
 249 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci)
 250 {
 251         u16 head_len;
 252         struct sk_buff *skb = *skb_p;
 253
 254         switch (skb->protocol) {
 255         case __constant_ntohs(ETH_P_IP):
 256                 head_len = 4;
 257                 skb_push(skb, head_len);
 258                 skb->data[3] = NLPID_IP;
 259                 break;
 260
 261         case __constant_ntohs(ETH_P_IPV6):
 262                 head_len = 4;
 263                 skb_push(skb, head_len);
 264                 skb->data[3] = NLPID_IPV6;
 265                 break;
 266
 267         case __constant_ntohs(LMI_PROTO):
 268                 head_len = 4;
 269                 skb_push(skb, head_len);
 270                 skb->data[3] = LMI_PROTO;
 271                 break;
 272
 273         case __constant_ntohs(ETH_P_802_3):
 274                 head_len = 10;
 275                 if (skb_headroom(skb) < head_len) {
 276                         struct sk_buff *skb2 = skb_realloc_headroom(skb,
 277                                                                     head_len);
 278                         if (!skb2)
 279                                 return -ENOBUFS;
 280                         dev_kfree_skb(skb);
 281                         skb = *skb_p = skb2;
 282                 }
 283                 skb_push(skb, head_len);
 284                 skb->data[3] = FR_PAD;
 285                 skb->data[4] = NLPID_SNAP;
 286                 skb->data[5] = FR_PAD;
 287                 skb->data[6] = 0x80;
 288                 skb->data[7] = 0xC2;
 289                 skb->data[8] = 0x00;
 290                 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */
 291                 break;
 292
 293         default:
 294                 head_len = 10;
 295                 skb_push(skb, head_len);
 296                 skb->data[3] = FR_PAD;
 297                 skb->data[4] = NLPID_SNAP;
 298                 skb->data[5] = FR_PAD;
 299                 skb->data[6] = FR_PAD;
 300                 skb->data[7] = FR_PAD;
 301                 *(u16*)(skb->data + 8) = skb->protocol;
 302         }
 303
 304         dlci_to_q922(skb->data, dlci);
 305         skb->data[2] = FR_UI;
 306         return 0;
 307 }
 308
 309
 310
 311 static int pvc_open(struct net_device *dev)
 312 {
 313         pvc_device *pvc = dev_to_pvc(dev);
 314
 315         if ((pvc->master->flags & IFF_UP) == 0)
 316                 return -EIO;  /* Master must be UP in order to activate PVC */
 317
 318         if (pvc->open_count++ == 0) {
 319                 hdlc_device *hdlc = dev_to_hdlc(pvc->master);
 320                 if (hdlc->state.fr.settings.lmi == LMI_NONE)
 321                         pvc->state.active = hdlc->carrier;
 322
 323                 pvc_carrier(pvc->state.active, pvc);
 324                 hdlc->state.fr.dce_changed = 1;
 325         }
 326         return 0;
 327 }
 328
 329
 330
 331 static int pvc_close(struct net_device *dev)
 332 {
 333         pvc_device *pvc = dev_to_pvc(dev);
 334
 335         if (--pvc->open_count == 0) {
 336                 hdlc_device *hdlc = dev_to_hdlc(pvc->master);
 337                 if (hdlc->state.fr.settings.lmi == LMI_NONE)
 338                         pvc->state.active = 0;
 339
 340                 if (hdlc->state.fr.settings.dce) {
 341                         hdlc->state.fr.dce_changed = 1;
 342                         pvc->state.active = 0;
 343                 }
 344         }
 345         return 0;
 346 }
 347
 348
 349
 350 int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 351 {
 352         pvc_device *pvc = dev_to_pvc(dev);
 353         fr_proto_pvc_info info;
 354
 355         if (ifr->ifr_settings.type == IF_GET_PROTO) {
 356                 if (dev->type == ARPHRD_ETHER)
 357                         ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC;
 358                 else
 359                         ifr->ifr_settings.type = IF_PROTO_FR_PVC;
 360
 361                 if (ifr->ifr_settings.size < sizeof(info)) {
 362                         /* data size wanted */
 363                         ifr->ifr_settings.size = sizeof(info);
 364                         return -ENOBUFS;
 365                 }
 366
 367                 info.dlci = pvc->dlci;
 368                 memcpy(info.master, pvc->master->name, IFNAMSIZ);
 369                 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info,
 370                                  &info, sizeof(info)))
 371                         return -EFAULT;
 372                 return 0;
 373         }
 374
 375         return -EINVAL;
 376 }
 377
 378
 379 static inline struct net_device_stats *pvc_get_stats(struct net_device *dev)
 380 {
 381         return netdev_priv(dev);
 382 }
 383
 384
 385
 386 static int pvc_xmit(struct sk_buff *skb, struct net_device *dev)
 387 {
 388         pvc_device *pvc = dev_to_pvc(dev);
 389         struct net_device_stats *stats = pvc_get_stats(dev);
 390
 391         if (pvc->state.active) {
 392                 if (dev->type == ARPHRD_ETHER) {
 393                         int pad = ETH_ZLEN - skb->len;
 394                         if (pad > 0) { /* Pad the frame with zeros */
 395                                 int len = skb->len;
 396                                 if (skb_tailroom(skb) < pad)
 397                                         if (pskb_expand_head(skb, 0, pad,
 398                                                              GFP_ATOMIC)) {
 399                                                 stats->tx_dropped++;
 400                                                 dev_kfree_skb(skb);
 401                                                 return 0;
 402                                         }
 403                                 skb_put(skb, pad);
 404                                 memset(skb->data + len, 0, pad);
 405                         }
 406                         skb->protocol = __constant_htons(ETH_P_802_3);
 407                 }
 408                 if (!fr_hard_header(&skb, pvc->dlci)) {
 409                         stats->tx_bytes += skb->len;
 410                         stats->tx_packets++;
 411                         if (pvc->state.fecn) /* TX Congestion counter */
 412                                 stats->tx_compressed++;
 413                         skb->dev = pvc->master;
 414                         dev_queue_xmit(skb);
 415                         return 0;
 416                 }
 417         }
 418
 419         stats->tx_dropped++;
 420         dev_kfree_skb(skb);
 421         return 0;
 422 }
 423
 424
 425
 426 static int pvc_change_mtu(struct net_device *dev, int new_mtu)
 427 {
 428         if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
 429                 return -EINVAL;
 430         dev->mtu = new_mtu;
 431         return 0;
 432 }
 433
 434
 435
 436 static inline void fr_log_dlci_active(pvc_device *pvc)
 437 {
 438         printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n",
 439                pvc->master->name,
 440                pvc->dlci,
 441                pvc->main ? pvc->main->name : "",
 442                pvc->main && pvc->ether ? " " : "",
 443                pvc->ether ? pvc->ether->name : "",
 444                pvc->state.new ? " new" : "",
 445                !pvc->state.exist ? "deleted" :
 446                pvc->state.active ? "active" : "inactive");
 447 }
 448
 449
 450
 451 static inline u8 fr_lmi_nextseq(u8 x)
 452 {
 453         x++;
 454         return x ? x : 1;
 455 }
 456
 457
 458
 459 static void fr_lmi_send(struct net_device *dev, int fullrep)
 460 {
 461         hdlc_device *hdlc = dev_to_hdlc(dev);
 462         struct sk_buff *skb;
 463         pvc_device *pvc = hdlc->state.fr.first_pvc;
 464         int len = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? LMI_ANSI_LENGTH
 465                 : LMI_LENGTH;
 466         int stat_len = 3;
 467         u8 *data;
 468         int i = 0;
 469
 470         if (hdlc->state.fr.settings.dce && fullrep) {
 471                 len += hdlc->state.fr.dce_pvc_count * (2 + stat_len);
 472                 if (len > HDLC_MAX_MRU) {
 473                         printk(KERN_WARNING "%s: Too many PVCs while sending "
 474                                "LMI full report\n", dev->name);
 475                         return;
 476                 }
 477         }
 478
 479         skb = dev_alloc_skb(len);
 480         if (!skb) {
 481                 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n",
 482                        dev->name);
 483                 return;
 484         }
 485         memset(skb->data, 0, len);
 486         skb_reserve(skb, 4);
 487         skb->protocol = __constant_htons(LMI_PROTO);
 488         fr_hard_header(&skb, LMI_DLCI);
 489         data = skb->tail;
 490         data[i++] = LMI_CALLREF;
 491         data[i++] = hdlc->state.fr.settings.dce
 492                 ? LMI_STATUS : LMI_STATUS_ENQUIRY;
 493         if (hdlc->state.fr.settings.lmi == LMI_ANSI)
 494                 data[i++] = LMI_ANSI_LOCKSHIFT;
 495         data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
 496                 ? LMI_CCITT_REPTYPE : LMI_REPTYPE;
 497         data[i++] = LMI_REPT_LEN;
 498         data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY;
 499
 500         data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
 501                 ? LMI_CCITT_ALIVE : LMI_ALIVE;
 502         data[i++] = LMI_INTEG_LEN;
 503         data[i++] = hdlc->state.fr.txseq =fr_lmi_nextseq(hdlc->state.fr.txseq);
 504         data[i++] = hdlc->state.fr.rxseq;
 505
 506         if (hdlc->state.fr.settings.dce && fullrep) {
 507                 while (pvc) {
 508                         data[i++] = (hdlc->state.fr.settings.lmi == LMI_CCITT)
 509                                 ? LMI_CCITT_PVCSTAT : LMI_PVCSTAT;
 510                         data[i++] = stat_len;
 511
 512                         /* LMI start/restart */
 513                         if (hdlc->state.fr.reliable && !pvc->state.exist) {
 514                                 pvc->state.exist = pvc->state.new = 1;
 515                                 fr_log_dlci_active(pvc);
 516                         }
 517
 518                         /* ifconfig PVC up */
 519                         if (pvc->open_count && !pvc->state.active &&
 520                             pvc->state.exist && !pvc->state.new) {
 521                                 pvc_carrier(1, pvc);
 522                                 pvc->state.active = 1;
 523                                 fr_log_dlci_active(pvc);
 524                         }
 525
 526                         dlci_to_status(pvc->dlci, data + i,
 527                                        pvc->state.active, pvc->state.new);
 528                         i += stat_len;
 529                         pvc = pvc->next;
 530                 }
 531         }
 532
 533         skb_put(skb, i);
 534         skb->priority = TC_PRIO_CONTROL;
 535         skb->dev = dev;
 536         skb->nh.raw = skb->data;
 537
 538         dev_queue_xmit(skb);
 539 }
 540
 541
 542
 543 static void fr_set_link_state(int reliable, struct net_device *dev)
 544 {
 545         hdlc_device *hdlc = dev_to_hdlc(dev);
 546         pvc_device *pvc = hdlc->state.fr.first_pvc;
 547
 548         hdlc->state.fr.reliable = reliable;
 549         if (reliable) {
 550                 if (!netif_carrier_ok(dev))
 551                         netif_carrier_on(dev);
 552
 553                 hdlc->state.fr.n391cnt = 0; /* Request full status */
 554                 hdlc->state.fr.dce_changed = 1;
 555
 556                 if (hdlc->state.fr.settings.lmi == LMI_NONE) {
 557                         while (pvc) {   /* Activate all PVCs */
 558                                 pvc_carrier(1, pvc);
 559                                 pvc->state.exist = pvc->state.active = 1;
 560                                 pvc->state.new = 0;
 561                                 pvc = pvc->next;
 562                         }
 563                 }
 564         } else {
 565                 if (netif_carrier_ok(dev))
 566                         netif_carrier_off(dev);
 567
 568                 while (pvc) {           /* Deactivate all PVCs */
 569                         pvc_carrier(0, pvc);
 570                         pvc->state.exist = pvc->state.active = 0;
 571                         pvc->state.new = 0;
 572                         pvc = pvc->next;
 573                 }
 574         }
 575 }
 576
 577
 578
 579 static void fr_timer(unsigned long arg)
 580 {
 581         struct net_device *dev = (struct net_device *)arg;
 582         hdlc_device *hdlc = dev_to_hdlc(dev);
 583         int i, cnt = 0, reliable;
 584         u32 list;
 585
 586         if (hdlc->state.fr.settings.dce)
 587                 reliable = hdlc->state.fr.request &&
 588                         time_before(jiffies, hdlc->state.fr.last_poll +
 589                                     hdlc->state.fr.settings.t392 * HZ);
 590         else {
 591                 hdlc->state.fr.last_errors <<= 1; /* Shift the list */
 592                 if (hdlc->state.fr.request) {
 593                         if (hdlc->state.fr.reliable)
 594                                 printk(KERN_INFO "%s: No LMI status reply "
 595                                        "received\n", dev->name);
 596                         hdlc->state.fr.last_errors |= 1;
 597                 }
 598
 599                 list = hdlc->state.fr.last_errors;
 600                 for (i = 0; i < hdlc->state.fr.settings.n393; i++, list >>= 1)
 601                         cnt += (list & 1);      /* errors count */
 602
 603                 reliable = (cnt < hdlc->state.fr.settings.n392);
 604         }
 605
 606         if (hdlc->state.fr.reliable != reliable) {
 607                 printk(KERN_INFO "%s: Link %sreliable\n", dev->name,
 608                        reliable ? "" : "un");
 609                 fr_set_link_state(reliable, dev);
 610         }
 611
 612         if (hdlc->state.fr.settings.dce)
 613                 hdlc->state.fr.timer.expires = jiffies +
 614                         hdlc->state.fr.settings.t392 * HZ;
 615         else {
 616                 if (hdlc->state.fr.n391cnt)
 617                         hdlc->state.fr.n391cnt--;
 618
 619                 fr_lmi_send(dev, hdlc->state.fr.n391cnt == 0);
 620
 621                 hdlc->state.fr.last_poll = jiffies;
 622                 hdlc->state.fr.request = 1;
 623                 hdlc->state.fr.timer.expires = jiffies +
 624                         hdlc->state.fr.settings.t391 * HZ;
 625         }
 626
 627         hdlc->state.fr.timer.function = fr_timer;
 628         hdlc->state.fr.timer.data = arg;
 629         add_timer(&hdlc->state.fr.timer);
 630 }
 631
 632
 633
 634 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb)
 635 {
 636         hdlc_device *hdlc = dev_to_hdlc(dev);
 637         int stat_len;
 638         pvc_device *pvc;
 639         int reptype = -1, error, no_ram;
 640         u8 rxseq, txseq;
 641         int i;
 642
 643         if (skb->len < ((hdlc->state.fr.settings.lmi == LMI_ANSI)
 644                         ? LMI_ANSI_LENGTH : LMI_LENGTH)) {
 645                 printk(KERN_INFO "%s: Short LMI frame\n", dev->name);
 646                 return 1;
 647         }
 648
 649         if (skb->data[5] != (!hdlc->state.fr.settings.dce ?
 650                              LMI_STATUS : LMI_STATUS_ENQUIRY)) {
 651                 printk(KERN_INFO "%s: LMI msgtype=%x, Not LMI status %s\n",
 652                        dev->name, skb->data[2],
 653                        hdlc->state.fr.settings.dce ? "enquiry" : "reply");
 654                 return 1;
 655         }
 656
 657         i = (hdlc->state.fr.settings.lmi == LMI_ANSI) ? 7 : 6;
 658
 659         if (skb->data[i] !=
 660             ((hdlc->state.fr.settings.lmi == LMI_CCITT)
 661              ? LMI_CCITT_REPTYPE : LMI_REPTYPE)) {
 662                 printk(KERN_INFO "%s: Not a report type=%x\n",
 663                        dev->name, skb->data[i]);
 664                 return 1;
 665         }
 666         i++;
 667
 668         i++;                            /* Skip length field */
 669
 670         reptype = skb->data[i++];
 671
 672         if (skb->data[i]!=
 673             ((hdlc->state.fr.settings.lmi == LMI_CCITT)
 674              ? LMI_CCITT_ALIVE : LMI_ALIVE)) {
 675                 printk(KERN_INFO "%s: Unsupported status element=%x\n",
 676                        dev->name, skb->data[i]);
 677                 return 1;
 678         }
 679         i++;
 680
 681         i++;                    /* Skip length field */
 682
 683         hdlc->state.fr.rxseq = skb->data[i++]; /* TX sequence from peer */
 684         rxseq = skb->data[i++]; /* Should confirm our sequence */
 685
 686         txseq = hdlc->state.fr.txseq;
 687
 688         if (hdlc->state.fr.settings.dce) {
 689                 if (reptype != LMI_FULLREP && reptype != LMI_INTEGRITY) {
 690                         printk(KERN_INFO "%s: Unsupported report type=%x\n",
 691                                dev->name, reptype);
 692                         return 1;
 693                 }
 694                 hdlc->state.fr.last_poll = jiffies;
 695         }
 696
 697         error = 0;
 698         if (!hdlc->state.fr.reliable)
 699                 error = 1;
 700
 701         if (rxseq == 0 || rxseq != txseq) {
 702                 hdlc->state.fr.n391cnt = 0; /* Ask for full report next time */
 703                 error = 1;
 704         }
 705
 706         if (hdlc->state.fr.settings.dce) {
 707                 if (hdlc->state.fr.fullrep_sent && !error) {
 708 /* Stop sending full report - the last one has been confirmed by DTE */
 709                         hdlc->state.fr.fullrep_sent = 0;
 710                         pvc = hdlc->state.fr.first_pvc;
 711                         while (pvc) {
 712                                 if (pvc->state.new) {
 713                                         pvc->state.new = 0;
 714
 715 /* Tell DTE that new PVC is now active */
 716                                         hdlc->state.fr.dce_changed = 1;
 717                                 }
 718                                 pvc = pvc->next;
 719                         }
 720                 }
 721
 722                 if (hdlc->state.fr.dce_changed) {
 723                         reptype = LMI_FULLREP;
 724                         hdlc->state.fr.fullrep_sent = 1;
 725                         hdlc->state.fr.dce_changed = 0;
 726                 }
 727
 728                 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0);
 729                 return 0;
 730         }
 731
 732         /* DTE */
 733
 734         hdlc->state.fr.request = 0; /* got response, no request pending */
 735
 736         if (error)
 737                 return 0;
 738
 739         if (reptype != LMI_FULLREP)
 740                 return 0;
 741
 742         stat_len = 3;
 743         pvc = hdlc->state.fr.first_pvc;
 744
 745         while (pvc) {
 746                 pvc->state.deleted = 1;
 747                 pvc = pvc->next;
 748         }
 749
 750         no_ram = 0;
 751         while (skb->len >= i + 2 + stat_len) {
 752                 u16 dlci;
 753                 unsigned int active, new;
 754
 755                 if (skb->data[i] != ((hdlc->state.fr.settings.lmi == LMI_CCITT)
 756                                      ? LMI_CCITT_PVCSTAT : LMI_PVCSTAT)) {
 757                         printk(KERN_WARNING "%s: Invalid PVCSTAT ID: %x\n",
 758                                dev->name, skb->data[i]);
 759                         return 1;
 760                 }
 761                 i++;
 762
 763                 if (skb->data[i] != stat_len) {
 764                         printk(KERN_WARNING "%s: Invalid PVCSTAT length: %x\n",
 765                                dev->name, skb->data[i]);
 766                         return 1;
 767                 }
 768                 i++;
 769
 770                 dlci = status_to_dlci(skb->data + i, &active, &new);
 771
 772                 pvc = add_pvc(dev, dlci);
 773
 774                 if (!pvc && !no_ram) {
 775                         printk(KERN_WARNING
 776                                "%s: Memory squeeze on fr_lmi_recv()\n",
 777                                dev->name);
 778                         no_ram = 1;
 779                 }
 780
 781                 if (pvc) {
 782                         pvc->state.exist = 1;
 783                         pvc->state.deleted = 0;
 784                         if (active != pvc->state.active ||
 785                             new != pvc->state.new ||
 786                             !pvc->state.exist) {
 787                                 pvc->state.new = new;
 788                                 pvc->state.active = active;
 789                                 pvc_carrier(active, pvc);
 790                                 fr_log_dlci_active(pvc);
 791                         }
 792                 }
 793
 794                 i += stat_len;
 795         }
 796
 797         pvc = hdlc->state.fr.first_pvc;
 798
 799         while (pvc) {
 800                 if (pvc->state.deleted && pvc->state.exist) {
 801                         pvc_carrier(0, pvc);
 802                         pvc->state.active = pvc->state.new = 0;
 803                         pvc->state.exist = 0;
 804                         fr_log_dlci_active(pvc);
 805                 }
 806                 pvc = pvc->next;
 807         }
 808
 809         /* Next full report after N391 polls */
 810         hdlc->state.fr.n391cnt = hdlc->state.fr.settings.n391;
 811
 812         return 0;
 813 }
 814
 815
 816
 817 static int fr_rx(struct sk_buff *skb)
 818 {
 819         struct net_device *ndev = skb->dev;
 820         hdlc_device *hdlc = dev_to_hdlc(ndev);
 821         fr_hdr *fh = (fr_hdr*)skb->data;
 822         u8 *data = skb->data;
 823         u16 dlci;
 824         pvc_device *pvc;
 825         struct net_device *dev = NULL;
 826
 827         if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI)
 828                 goto rx_error;
 829
 830         dlci = q922_to_dlci(skb->data);
 831
 832         if (dlci == LMI_DLCI) {
 833                 if (hdlc->state.fr.settings.lmi == LMI_NONE)
 834                         goto rx_error; /* LMI packet with no LMI? */
 835
 836                 if (data[3] == LMI_PROTO) {
 837                         if (fr_lmi_recv(ndev, skb))
 838                                 goto rx_error;
 839                         else {
 840                                 dev_kfree_skb_any(skb);
 841                                 return NET_RX_SUCCESS;
 842                         }
 843                 }
 844
 845                 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n",
 846                        ndev->name);
 847                 goto rx_error;
 848         }
 849
 850         pvc = find_pvc(hdlc, dlci);
 851         if (!pvc) {
 852 #ifdef DEBUG_PKT
 853                 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n",
 854                        ndev->name, dlci);
 855 #endif
 856                 dev_kfree_skb_any(skb);
 857                 return NET_RX_DROP;
 858         }
 859
 860         if (pvc->state.fecn != fh->fecn) {
 861 #ifdef DEBUG_ECN
 862                 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", ndev->name,
 863                        dlci, fh->fecn ? "N" : "FF");
 864 #endif
 865                 pvc->state.fecn ^= 1;
 866         }
 867
 868         if (pvc->state.becn != fh->becn) {
 869 #ifdef DEBUG_ECN
 870                 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", ndev->name,
 871                        dlci, fh->becn ? "N" : "FF");
 872 #endif
 873                 pvc->state.becn ^= 1;
 874         }
 875
 876
 877         if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) {
 878                 hdlc->stats.rx_dropped++;
 879                 return NET_RX_DROP;
 880         }
 881
 882         if (data[3] == NLPID_IP) {
 883                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 884                 dev = pvc->main;
 885                 skb->protocol = htons(ETH_P_IP);
 886
 887         } else if (data[3] == NLPID_IPV6) {
 888                 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */
 889                 dev = pvc->main;
 890                 skb->protocol = htons(ETH_P_IPV6);
 891
 892         } else if (skb->len > 10 && data[3] == FR_PAD &&
 893                    data[4] == NLPID_SNAP && data[5] == FR_PAD) {
 894                 u16 oui = ntohs(*(u16*)(data + 6));
 895                 u16 pid = ntohs(*(u16*)(data + 8));
 896                 skb_pull(skb, 10);
 897
 898                 switch ((((u32)oui) << 16) | pid) {
 899                 case ETH_P_ARP: /* routed frame with SNAP */
 900                 case ETH_P_IPX:
 901                 case ETH_P_IP:  /* a long variant */
 902                 case ETH_P_IPV6:
 903                         dev = pvc->main;
 904                         skb->protocol = htons(pid);
 905                         break;
 906
 907                 case 0x80C20007: /* bridged Ethernet frame */
 908                         if ((dev = pvc->ether) != NULL)
 909                                 skb->protocol = eth_type_trans(skb, dev);
 910                         break;
 911
 912                 default:
 913                         printk(KERN_INFO "%s: Unsupported protocol, OUI=%x "
 914                                "PID=%x\n", ndev->name, oui, pid);
 915                         dev_kfree_skb_any(skb);
 916                         return NET_RX_DROP;
 917                 }
 918         } else {
 919                 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x "
 920                        "length = %i\n", ndev->name, data[3], skb->len);
 921                 dev_kfree_skb_any(skb);
 922                 return NET_RX_DROP;
 923         }
 924
 925         if (dev) {
 926                 struct net_device_stats *stats = pvc_get_stats(dev);
 927                 stats->rx_packets++; /* PVC traffic */
 928                 stats->rx_bytes += skb->len;
 929                 if (pvc->state.becn)
 930                         stats->rx_compressed++;
 931                 skb->dev = dev;
 932                 netif_rx(skb);
 933                 return NET_RX_SUCCESS;
 934         } else {
 935                 dev_kfree_skb_any(skb);
 936                 return NET_RX_DROP;
 937         }
 938
 939  rx_error:
 940         hdlc->stats.rx_errors++; /* Mark error */
 941         dev_kfree_skb_any(skb);
 942         return NET_RX_DROP;
 943 }
 944
 945
 946
 947 static void fr_start(struct net_device *dev)
 948 {
 949         hdlc_device *hdlc = dev_to_hdlc(dev);
 950 #ifdef DEBUG_LINK
 951         printk(KERN_DEBUG "fr_start\n");
 952 #endif
 953         if (hdlc->state.fr.settings.lmi != LMI_NONE) {
 954                 hdlc->state.fr.reliable = 0;
 955                 hdlc->state.fr.dce_changed = 1;
 956                 hdlc->state.fr.request = 0;
 957                 hdlc->state.fr.fullrep_sent = 0;
 958                 hdlc->state.fr.last_errors = 0xFFFFFFFF;
 959                 hdlc->state.fr.n391cnt = 0;
 960                 hdlc->state.fr.txseq = hdlc->state.fr.rxseq = 0;
 961
 962                 init_timer(&hdlc->state.fr.timer);
 963                 /* First poll after 1 s */
 964                 hdlc->state.fr.timer.expires = jiffies + HZ;
 965                 hdlc->state.fr.timer.function = fr_timer;
 966                 hdlc->state.fr.timer.data = (unsigned long)dev;
 967                 add_timer(&hdlc->state.fr.timer);
 968         } else
 969                 fr_set_link_state(1, dev);
 970 }
 971
 972
 973
 974 static void fr_stop(struct net_device *dev)
 975 {
 976         hdlc_device *hdlc = dev_to_hdlc(dev);
 977 #ifdef DEBUG_LINK
 978         printk(KERN_DEBUG "fr_stop\n");
 979 #endif
 980         if (hdlc->state.fr.settings.lmi != LMI_NONE)
 981                 del_timer_sync(&hdlc->state.fr.timer);
 982         fr_set_link_state(0, dev);
 983 }
 984
 985
 986
 987 static void fr_close(struct net_device *dev)
 988 {
 989         hdlc_device *hdlc = dev_to_hdlc(dev);
 990         pvc_device *pvc = hdlc->state.fr.first_pvc;
 991
 992         while (pvc) {           /* Shutdown all PVCs for this FRAD */
 993                 if (pvc->main)
 994                         dev_close(pvc->main);
 995                 if (pvc->ether)
 996                         dev_close(pvc->ether);
 997                 pvc = pvc->next;
 998         }
 999 }
1000
1001 static void dlci_setup(struct net_device *dev)
1002 {
1003         dev->type = ARPHRD_DLCI;
1004         dev->flags = IFF_POINTOPOINT;
1005         dev->hard_header_len = 10;
1006         dev->addr_len = 2;
1007 }
1008
1009 static int fr_add_pvc(struct net_device *master, unsigned int dlci, int type)
1010 {
1011         hdlc_device *hdlc = dev_to_hdlc(master);
1012         pvc_device *pvc = NULL;
1013         struct net_device *dev;
1014         int result, used;
1015         char * prefix = "pvc%d";
1016
1017         if (type == ARPHRD_ETHER)
1018                 prefix = "pvceth%d";
1019
1020         if ((pvc = add_pvc(master, dlci)) == NULL) {
1021                 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n",
1022                        master->name);
1023                 return -ENOBUFS;
1024         }
1025
1026         if (*get_dev_p(pvc, type))
1027                 return -EEXIST;
1028
1029         used = pvc_is_used(pvc);
1030
1031         if (type == ARPHRD_ETHER)
1032                 dev = alloc_netdev(sizeof(struct net_device_stats),
1033                                    "pvceth%d", ether_setup);
1034         else
1035                 dev = alloc_netdev(sizeof(struct net_device_stats),
1036                                    "pvc%d", dlci_setup);
1037
1038         if (!dev) {
1039                 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n",
1040                        master->name);
1041                 delete_unused_pvcs(hdlc);
1042                 return -ENOBUFS;
1043         }
1044
1045         if (type == ARPHRD_ETHER) {
1046                 memcpy(dev->dev_addr, "\x00\x01", 2);
1047                 get_random_bytes(dev->dev_addr + 2, ETH_ALEN - 2);
1048         } else {
1049                 *(u16*)dev->dev_addr = htons(dlci);
1050                 dlci_to_q922(dev->broadcast, dlci);
1051         }
1052         dev->hard_start_xmit = pvc_xmit;
1053         dev->get_stats = pvc_get_stats;
1054         dev->open = pvc_open;
1055         dev->stop = pvc_close;
1056         dev->do_ioctl = pvc_ioctl;
1057         dev->change_mtu = pvc_change_mtu;
1058         dev->mtu = HDLC_MAX_MTU;
1059         dev->tx_queue_len = 0;
1060         dev->priv = pvc;
1061
1062         result = dev_alloc_name(dev, dev->name);
1063         if (result < 0) {
1064                 free_netdev(dev);
1065                 delete_unused_pvcs(hdlc);
1066                 return result;
1067         }
1068
1069         if (register_netdevice(dev) != 0) {
1070                 free_netdev(dev);
1071                 delete_unused_pvcs(hdlc);
1072                 return -EIO;
1073         }
1074
1075         dev->destructor = free_netdev;
1076         *get_dev_p(pvc, type) = dev;
1077         if (!used) {
1078                 hdlc->state.fr.dce_changed = 1;
1079                 hdlc->state.fr.dce_pvc_count++;
1080         }
1081         return 0;
1082 }
1083
1084
1085
1086 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type)
1087 {
1088         pvc_device *pvc;
1089         struct net_device *dev;
1090
1091         if ((pvc = find_pvc(hdlc, dlci)) == NULL)
1092                 return -ENOENT;
1093
1094         if ((dev = *get_dev_p(pvc, type)) == NULL)
1095                 return -ENOENT;
1096
1097         if (dev->flags & IFF_UP)
1098                 return -EBUSY;          /* PVC in use */
1099
1100         unregister_netdevice(dev); /* the destructor will free_netdev(dev) */
1101         *get_dev_p(pvc, type) = NULL;
1102
1103         if (!pvc_is_used(pvc)) {
1104                 hdlc->state.fr.dce_pvc_count--;
1105                 hdlc->state.fr.dce_changed = 1;
1106         }
1107         delete_unused_pvcs(hdlc);
1108         return 0;
1109 }
1110
1111
1112
1113 static void fr_destroy(hdlc_device *hdlc)
1114 {
1115         pvc_device *pvc;
1116
1117         pvc = hdlc->state.fr.first_pvc;
1118         hdlc->state.fr.first_pvc = NULL; /* All PVCs destroyed */
1119         hdlc->state.fr.dce_pvc_count = 0;
1120         hdlc->state.fr.dce_changed = 1;
1121
1122         while (pvc) {
1123                 pvc_device *next = pvc->next;
1124                 /* destructors will free_netdev() main and ether */
1125                 if (pvc->main)
1126                         unregister_netdevice(pvc->main);
1127
1128                 if (pvc->ether)
1129                         unregister_netdevice(pvc->ether);
1130
1131                 kfree(pvc);
1132                 pvc = next;
1133         }
1134 }
1135
1136
1137
1138 int hdlc_fr_ioctl(struct net_device *dev, struct ifreq *ifr)
1139 {
1140         fr_proto *fr_s = ifr->ifr_settings.ifs_ifsu.fr;
1141         const size_t size = sizeof(fr_proto);
1142         fr_proto new_settings;
1143         hdlc_device *hdlc = dev_to_hdlc(dev);
1144         fr_proto_pvc pvc;
1145         int result;
1146
1147         switch (ifr->ifr_settings.type) {
1148         case IF_GET_PROTO:
1149                 ifr->ifr_settings.type = IF_PROTO_FR;
1150                 if (ifr->ifr_settings.size < size) {
1151                         ifr->ifr_settings.size = size; /* data size wanted */
1152                         return -ENOBUFS;
1153                 }
1154                 if (copy_to_user(fr_s, &hdlc->state.fr.settings, size))
1155                         return -EFAULT;
1156                 return 0;
1157
1158         case IF_PROTO_FR:
1159                 if(!capable(CAP_NET_ADMIN))
1160                         return -EPERM;
1161
1162                 if(dev->flags & IFF_UP)
1163                         return -EBUSY;
1164
1165                 if (copy_from_user(&new_settings, fr_s, size))
1166                         return -EFAULT;
1167
1168                 if (new_settings.lmi == LMI_DEFAULT)
1169                         new_settings.lmi = LMI_ANSI;
1170
1171                 if ((new_settings.lmi != LMI_NONE &&
1172                      new_settings.lmi != LMI_ANSI &&
1173                      new_settings.lmi != LMI_CCITT) ||
1174                     new_settings.t391 < 1 ||
1175                     new_settings.t392 < 2 ||
1176                     new_settings.n391 < 1 ||
1177                     new_settings.n392 < 1 ||
1178                     new_settings.n393 < new_settings.n392 ||
1179                     new_settings.n393 > 32 ||
1180                     (new_settings.dce != 0 &&
1181                      new_settings.dce != 1))
1182                         return -EINVAL;
1183
1184                 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1185                 if (result)
1186                         return result;
1187
1188                 if (hdlc->proto.id != IF_PROTO_FR) {
1189                         hdlc_proto_detach(hdlc);
1190                         hdlc->state.fr.first_pvc = NULL;
1191                         hdlc->state.fr.dce_pvc_count = 0;
1192                 }
1193                 memcpy(&hdlc->state.fr.settings, &new_settings, size);
1194                 memset(&hdlc->proto, 0, sizeof(hdlc->proto));
1195
1196                 hdlc->proto.close = fr_close;
1197                 hdlc->proto.start = fr_start;
1198                 hdlc->proto.stop = fr_stop;
1199                 hdlc->proto.detach = fr_destroy;
1200                 hdlc->proto.netif_rx = fr_rx;
1201                 hdlc->proto.id = IF_PROTO_FR;
1202                 dev->hard_start_xmit = hdlc->xmit;
1203                 dev->hard_header = NULL;
1204                 dev->type = ARPHRD_FRAD;
1205                 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1206                 dev->addr_len = 0;
1207                 return 0;
1208
1209         case IF_PROTO_FR_ADD_PVC:
1210         case IF_PROTO_FR_DEL_PVC:
1211         case IF_PROTO_FR_ADD_ETH_PVC:
1212         case IF_PROTO_FR_DEL_ETH_PVC:
1213                 if(!capable(CAP_NET_ADMIN))
1214                         return -EPERM;
1215
1216                 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc,
1217                                    sizeof(fr_proto_pvc)))
1218                         return -EFAULT;
1219
1220                 if (pvc.dlci <= 0 || pvc.dlci >= 1024)
1221                         return -EINVAL; /* Only 10 bits, DLCI 0 reserved */
1222
1223                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC ||
1224                     ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC)
1225                         result = ARPHRD_ETHER; /* bridged Ethernet device */
1226                 else
1227                         result = ARPHRD_DLCI;
1228
1229                 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC ||
1230                     ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC)
1231                         return fr_add_pvc(dev, pvc.dlci, result);
1232                 else
1233                         return fr_del_pvc(hdlc, pvc.dlci, result);
1234         }
1235
1236         return -EINVAL;
1237 }