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, u16 dlci) 275 { 276 if (!skb->dev) { /* Control packets */ 277 switch (dlci) { 278 case LMI_CCITT_ANSI_DLCI: 279 skb_push(skb, 4); 280 skb->data[3] = NLPID_CCITT_ANSI_LMI; 281 break; 282 283 case LMI_CISCO_DLCI: 284 skb_push(skb, 4); 285 skb->data[3] = NLPID_CISCO_LMI; 286 break; 287 288 default: 289 return -EINVAL; 290 } 291 292 } else if (skb->dev->type == ARPHRD_DLCI) { 293 switch (skb->protocol) { 294 case htons(ETH_P_IP): 295 skb_push(skb, 4); 296 skb->data[3] = NLPID_IP; 297 break; 298 299 case htons(ETH_P_IPV6): 300 skb_push(skb, 4); 301 skb->data[3] = NLPID_IPV6; 302 break; 303 304 default: 305 skb_push(skb, 10); 306 skb->data[3] = FR_PAD; 307 skb->data[4] = NLPID_SNAP; 308 /* OUI 00-00-00 indicates an Ethertype follows */ 309 skb->data[5] = 0x00; 310 skb->data[6] = 0x00; 311 skb->data[7] = 0x00; 312 /* This should be an Ethertype: */ 313 *(__be16 *)(skb->data + 8) = skb->protocol; 314 } 315 316 } else if (skb->dev->type == ARPHRD_ETHER) { 317 skb_push(skb, 10); 318 skb->data[3] = FR_PAD; 319 skb->data[4] = NLPID_SNAP; 320 /* OUI 00-80-C2 stands for the 802.1 organization */ 321 skb->data[5] = 0x00; 322 skb->data[6] = 0x80; 323 skb->data[7] = 0xC2; 324 /* PID 00-07 stands for Ethernet frames without FCS */ 325 skb->data[8] = 0x00; 326 skb->data[9] = 0x07; 327 328 } else { 329 return -EINVAL; 330 } 331 332 dlci_to_q922(skb->data, dlci); 333 skb->data[2] = FR_UI; 334 return 0; 335 } 336 337 338 339 static int pvc_open(struct net_device *dev) 340 { 341 struct pvc_device *pvc = dev->ml_priv; 342 343 if ((pvc->frad->flags & IFF_UP) == 0) 344 return -EIO; /* Frad must be UP in order to activate PVC */ 345 346 if (pvc->open_count++ == 0) { 347 hdlc_device *hdlc = dev_to_hdlc(pvc->frad); 348 if (state(hdlc)->settings.lmi == LMI_NONE) 349 pvc->state.active = netif_carrier_ok(pvc->frad); 350 351 pvc_carrier(pvc->state.active, pvc); 352 state(hdlc)->dce_changed = 1; 353 } 354 return 0; 355 } 356 357 358 359 static int pvc_close(struct net_device *dev) 360 { 361 struct pvc_device *pvc = dev->ml_priv; 362 363 if (--pvc->open_count == 0) { 364 hdlc_device *hdlc = dev_to_hdlc(pvc->frad); 365 if (state(hdlc)->settings.lmi == LMI_NONE) 366 pvc->state.active = 0; 367 368 if (state(hdlc)->settings.dce) { 369 state(hdlc)->dce_changed = 1; 370 pvc->state.active = 0; 371 } 372 } 373 return 0; 374 } 375 376 377 378 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 379 { 380 struct pvc_device *pvc = dev->ml_priv; 381 fr_proto_pvc_info info; 382 383 if (ifr->ifr_settings.type == IF_GET_PROTO) { 384 if (dev->type == ARPHRD_ETHER) 385 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC; 386 else 387 ifr->ifr_settings.type = IF_PROTO_FR_PVC; 388 389 if (ifr->ifr_settings.size < sizeof(info)) { 390 /* data size wanted */ 391 ifr->ifr_settings.size = sizeof(info); 392 return -ENOBUFS; 393 } 394 395 info.dlci = pvc->dlci; 396 memcpy(info.master, pvc->frad->name, IFNAMSIZ); 397 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info, 398 &info, sizeof(info))) 399 return -EFAULT; 400 return 0; 401 } 402 403 return -EINVAL; 404 } 405 406 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev) 407 { 408 struct pvc_device *pvc = dev->ml_priv; 409 410 if (!pvc->state.active) 411 goto drop; 412 413 if (dev->type == ARPHRD_ETHER) { 414 int pad = ETH_ZLEN - skb->len; 415 416 if (pad > 0) { /* Pad the frame with zeros */ 417 if (__skb_pad(skb, pad, false)) 418 goto drop; 419 skb_put(skb, pad); 420 } 421 } 422 423 /* We already requested the header space with dev->needed_headroom. 424 * So this is just a protection in case the upper layer didn't take 425 * dev->needed_headroom into consideration. 426 */ 427 if (skb_headroom(skb) < 10) { 428 struct sk_buff *skb2 = skb_realloc_headroom(skb, 10); 429 430 if (!skb2) 431 goto drop; 432 dev_kfree_skb(skb); 433 skb = skb2; 434 } 435 436 skb->dev = dev; 437 if (fr_hard_header(skb, pvc->dlci)) 438 goto drop; 439 440 dev->stats.tx_bytes += skb->len; 441 dev->stats.tx_packets++; 442 if (pvc->state.fecn) /* TX Congestion counter */ 443 dev->stats.tx_compressed++; 444 skb->dev = pvc->frad; 445 skb->protocol = htons(ETH_P_HDLC); 446 skb_reset_network_header(skb); 447 dev_queue_xmit(skb); 448 return NETDEV_TX_OK; 449 450 drop: 451 dev->stats.tx_dropped++; 452 kfree_skb(skb); 453 return NETDEV_TX_OK; 454 } 455 456 static inline void fr_log_dlci_active(struct pvc_device *pvc) 457 { 458 netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n", 459 pvc->dlci, 460 pvc->main ? pvc->main->name : "", 461 pvc->main && pvc->ether ? " " : "", 462 pvc->ether ? pvc->ether->name : "", 463 pvc->state.new ? " new" : "", 464 !pvc->state.exist ? "deleted" : 465 pvc->state.active ? "active" : "inactive"); 466 } 467 468 469 470 static inline u8 fr_lmi_nextseq(u8 x) 471 { 472 x++; 473 return x ? x : 1; 474 } 475 476 477 static void fr_lmi_send(struct net_device *dev, int fullrep) 478 { 479 hdlc_device *hdlc = dev_to_hdlc(dev); 480 struct sk_buff *skb; 481 struct pvc_device *pvc = state(hdlc)->first_pvc; 482 int lmi = state(hdlc)->settings.lmi; 483 int dce = state(hdlc)->settings.dce; 484 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH; 485 int stat_len = (lmi == LMI_CISCO) ? 6 : 3; 486 u8 *data; 487 int i = 0; 488 489 if (dce && fullrep) { 490 len += state(hdlc)->dce_pvc_count * (2 + stat_len); 491 if (len > HDLC_MAX_MRU) { 492 netdev_warn(dev, "Too many PVCs while sending LMI full report\n"); 493 return; 494 } 495 } 496 497 skb = dev_alloc_skb(len); 498 if (!skb) { 499 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n"); 500 return; 501 } 502 memset(skb->data, 0, len); 503 skb_reserve(skb, 4); 504 if (lmi == LMI_CISCO) { 505 fr_hard_header(skb, LMI_CISCO_DLCI); 506 } else { 507 fr_hard_header(skb, LMI_CCITT_ANSI_DLCI); 508 } 509 data = skb_tail_pointer(skb); 510 data[i++] = LMI_CALLREF; 511 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY; 512 if (lmi == LMI_ANSI) 513 data[i++] = LMI_ANSI_LOCKSHIFT; 514 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : 515 LMI_ANSI_CISCO_REPTYPE; 516 data[i++] = LMI_REPT_LEN; 517 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY; 518 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE; 519 data[i++] = LMI_INTEG_LEN; 520 data[i++] = state(hdlc)->txseq = 521 fr_lmi_nextseq(state(hdlc)->txseq); 522 data[i++] = state(hdlc)->rxseq; 523 524 if (dce && fullrep) { 525 while (pvc) { 526 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : 527 LMI_ANSI_CISCO_PVCSTAT; 528 data[i++] = stat_len; 529 530 /* LMI start/restart */ 531 if (state(hdlc)->reliable && !pvc->state.exist) { 532 pvc->state.exist = pvc->state.new = 1; 533 fr_log_dlci_active(pvc); 534 } 535 536 /* ifconfig PVC up */ 537 if (pvc->open_count && !pvc->state.active && 538 pvc->state.exist && !pvc->state.new) { 539 pvc_carrier(1, pvc); 540 pvc->state.active = 1; 541 fr_log_dlci_active(pvc); 542 } 543 544 if (lmi == LMI_CISCO) { 545 data[i] = pvc->dlci >> 8; 546 data[i + 1] = pvc->dlci & 0xFF; 547 } else { 548 data[i] = (pvc->dlci >> 4) & 0x3F; 549 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80; 550 data[i + 2] = 0x80; 551 } 552 553 if (pvc->state.new) 554 data[i + 2] |= 0x08; 555 else if (pvc->state.active) 556 data[i + 2] |= 0x02; 557 558 i += stat_len; 559 pvc = pvc->next; 560 } 561 } 562 563 skb_put(skb, i); 564 skb->priority = TC_PRIO_CONTROL; 565 skb->dev = dev; 566 skb->protocol = htons(ETH_P_HDLC); 567 skb_reset_network_header(skb); 568 569 dev_queue_xmit(skb); 570 } 571 572 573 574 static void fr_set_link_state(int reliable, struct net_device *dev) 575 { 576 hdlc_device *hdlc = dev_to_hdlc(dev); 577 struct pvc_device *pvc = state(hdlc)->first_pvc; 578 579 state(hdlc)->reliable = reliable; 580 if (reliable) { 581 netif_dormant_off(dev); 582 state(hdlc)->n391cnt = 0; /* Request full status */ 583 state(hdlc)->dce_changed = 1; 584 585 if (state(hdlc)->settings.lmi == LMI_NONE) { 586 while (pvc) { /* Activate all PVCs */ 587 pvc_carrier(1, pvc); 588 pvc->state.exist = pvc->state.active = 1; 589 pvc->state.new = 0; 590 pvc = pvc->next; 591 } 592 } 593 } else { 594 netif_dormant_on(dev); 595 while (pvc) { /* Deactivate all PVCs */ 596 pvc_carrier(0, pvc); 597 pvc->state.exist = pvc->state.active = 0; 598 pvc->state.new = 0; 599 if (!state(hdlc)->settings.dce) 600 pvc->state.bandwidth = 0; 601 pvc = pvc->next; 602 } 603 } 604 } 605 606 607 static void fr_timer(struct timer_list *t) 608 { 609 struct frad_state *st = from_timer(st, t, timer); 610 struct net_device *dev = st->dev; 611 hdlc_device *hdlc = dev_to_hdlc(dev); 612 int i, cnt = 0, reliable; 613 u32 list; 614 615 if (state(hdlc)->settings.dce) { 616 reliable = state(hdlc)->request && 617 time_before(jiffies, state(hdlc)->last_poll + 618 state(hdlc)->settings.t392 * HZ); 619 state(hdlc)->request = 0; 620 } else { 621 state(hdlc)->last_errors <<= 1; /* Shift the list */ 622 if (state(hdlc)->request) { 623 if (state(hdlc)->reliable) 624 netdev_info(dev, "No LMI status reply received\n"); 625 state(hdlc)->last_errors |= 1; 626 } 627 628 list = state(hdlc)->last_errors; 629 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1) 630 cnt += (list & 1); /* errors count */ 631 632 reliable = (cnt < state(hdlc)->settings.n392); 633 } 634 635 if (state(hdlc)->reliable != reliable) { 636 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un"); 637 fr_set_link_state(reliable, dev); 638 } 639 640 if (state(hdlc)->settings.dce) 641 state(hdlc)->timer.expires = jiffies + 642 state(hdlc)->settings.t392 * HZ; 643 else { 644 if (state(hdlc)->n391cnt) 645 state(hdlc)->n391cnt--; 646 647 fr_lmi_send(dev, state(hdlc)->n391cnt == 0); 648 649 state(hdlc)->last_poll = jiffies; 650 state(hdlc)->request = 1; 651 state(hdlc)->timer.expires = jiffies + 652 state(hdlc)->settings.t391 * HZ; 653 } 654 655 add_timer(&state(hdlc)->timer); 656 } 657 658 659 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb) 660 { 661 hdlc_device *hdlc = dev_to_hdlc(dev); 662 struct pvc_device *pvc; 663 u8 rxseq, txseq; 664 int lmi = state(hdlc)->settings.lmi; 665 int dce = state(hdlc)->settings.dce; 666 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i; 667 668 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH : 669 LMI_CCITT_CISCO_LENGTH)) { 670 netdev_info(dev, "Short LMI frame\n"); 671 return 1; 672 } 673 674 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI : 675 NLPID_CCITT_ANSI_LMI)) { 676 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n"); 677 return 1; 678 } 679 680 if (skb->data[4] != LMI_CALLREF) { 681 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n", 682 skb->data[4]); 683 return 1; 684 } 685 686 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) { 687 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n", 688 skb->data[5]); 689 return 1; 690 } 691 692 if (lmi == LMI_ANSI) { 693 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) { 694 netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n", 695 skb->data[6]); 696 return 1; 697 } 698 i = 7; 699 } else 700 i = 6; 701 702 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : 703 LMI_ANSI_CISCO_REPTYPE)) { 704 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n", 705 skb->data[i]); 706 return 1; 707 } 708 709 if (skb->data[++i] != LMI_REPT_LEN) { 710 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n", 711 skb->data[i]); 712 return 1; 713 } 714 715 reptype = skb->data[++i]; 716 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) { 717 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n", 718 reptype); 719 return 1; 720 } 721 722 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE : 723 LMI_ANSI_CISCO_ALIVE)) { 724 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n", 725 skb->data[i]); 726 return 1; 727 } 728 729 if (skb->data[++i] != LMI_INTEG_LEN) { 730 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n", 731 skb->data[i]); 732 return 1; 733 } 734 i++; 735 736 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */ 737 rxseq = skb->data[i++]; /* Should confirm our sequence */ 738 739 txseq = state(hdlc)->txseq; 740 741 if (dce) 742 state(hdlc)->last_poll = jiffies; 743 744 error = 0; 745 if (!state(hdlc)->reliable) 746 error = 1; 747 748 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */ 749 state(hdlc)->n391cnt = 0; 750 error = 1; 751 } 752 753 if (dce) { 754 if (state(hdlc)->fullrep_sent && !error) { 755 /* Stop sending full report - the last one has been confirmed by DTE */ 756 state(hdlc)->fullrep_sent = 0; 757 pvc = state(hdlc)->first_pvc; 758 while (pvc) { 759 if (pvc->state.new) { 760 pvc->state.new = 0; 761 762 /* Tell DTE that new PVC is now active */ 763 state(hdlc)->dce_changed = 1; 764 } 765 pvc = pvc->next; 766 } 767 } 768 769 if (state(hdlc)->dce_changed) { 770 reptype = LMI_FULLREP; 771 state(hdlc)->fullrep_sent = 1; 772 state(hdlc)->dce_changed = 0; 773 } 774 775 state(hdlc)->request = 1; /* got request */ 776 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0); 777 return 0; 778 } 779 780 /* DTE */ 781 782 state(hdlc)->request = 0; /* got response, no request pending */ 783 784 if (error) 785 return 0; 786 787 if (reptype != LMI_FULLREP) 788 return 0; 789 790 pvc = state(hdlc)->first_pvc; 791 792 while (pvc) { 793 pvc->state.deleted = 1; 794 pvc = pvc->next; 795 } 796 797 no_ram = 0; 798 while (skb->len >= i + 2 + stat_len) { 799 u16 dlci; 800 u32 bw; 801 unsigned int active, new; 802 803 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : 804 LMI_ANSI_CISCO_PVCSTAT)) { 805 netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n", 806 skb->data[i]); 807 return 1; 808 } 809 810 if (skb->data[++i] != stat_len) { 811 netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n", 812 skb->data[i]); 813 return 1; 814 } 815 i++; 816 817 new = !! (skb->data[i + 2] & 0x08); 818 active = !! (skb->data[i + 2] & 0x02); 819 if (lmi == LMI_CISCO) { 820 dlci = (skb->data[i] << 8) | skb->data[i + 1]; 821 bw = (skb->data[i + 3] << 16) | 822 (skb->data[i + 4] << 8) | 823 (skb->data[i + 5]); 824 } else { 825 dlci = ((skb->data[i] & 0x3F) << 4) | 826 ((skb->data[i + 1] & 0x78) >> 3); 827 bw = 0; 828 } 829 830 pvc = add_pvc(dev, dlci); 831 832 if (!pvc && !no_ram) { 833 netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n"); 834 no_ram = 1; 835 } 836 837 if (pvc) { 838 pvc->state.exist = 1; 839 pvc->state.deleted = 0; 840 if (active != pvc->state.active || 841 new != pvc->state.new || 842 bw != pvc->state.bandwidth || 843 !pvc->state.exist) { 844 pvc->state.new = new; 845 pvc->state.active = active; 846 pvc->state.bandwidth = bw; 847 pvc_carrier(active, pvc); 848 fr_log_dlci_active(pvc); 849 } 850 } 851 852 i += stat_len; 853 } 854 855 pvc = state(hdlc)->first_pvc; 856 857 while (pvc) { 858 if (pvc->state.deleted && pvc->state.exist) { 859 pvc_carrier(0, pvc); 860 pvc->state.active = pvc->state.new = 0; 861 pvc->state.exist = 0; 862 pvc->state.bandwidth = 0; 863 fr_log_dlci_active(pvc); 864 } 865 pvc = pvc->next; 866 } 867 868 /* Next full report after N391 polls */ 869 state(hdlc)->n391cnt = state(hdlc)->settings.n391; 870 871 return 0; 872 } 873 874 static int fr_snap_parse(struct sk_buff *skb, struct pvc_device *pvc) 875 { 876 /* OUI 00-00-00 indicates an Ethertype follows */ 877 if (skb->data[0] == 0x00 && 878 skb->data[1] == 0x00 && 879 skb->data[2] == 0x00) { 880 if (!pvc->main) 881 return -1; 882 skb->dev = pvc->main; 883 skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */ 884 skb_pull(skb, 5); 885 skb_reset_mac_header(skb); 886 return 0; 887 888 /* OUI 00-80-C2 stands for the 802.1 organization */ 889 } else if (skb->data[0] == 0x00 && 890 skb->data[1] == 0x80 && 891 skb->data[2] == 0xC2) { 892 /* PID 00-07 stands for Ethernet frames without FCS */ 893 if (skb->data[3] == 0x00 && 894 skb->data[4] == 0x07) { 895 if (!pvc->ether) 896 return -1; 897 skb_pull(skb, 5); 898 if (skb->len < ETH_HLEN) 899 return -1; 900 skb->protocol = eth_type_trans(skb, pvc->ether); 901 return 0; 902 903 /* PID unsupported */ 904 } else { 905 return -1; 906 } 907 908 /* OUI unsupported */ 909 } else { 910 return -1; 911 } 912 } 913 914 static int fr_rx(struct sk_buff *skb) 915 { 916 struct net_device *frad = skb->dev; 917 hdlc_device *hdlc = dev_to_hdlc(frad); 918 struct fr_hdr *fh = (struct fr_hdr *)skb->data; 919 u8 *data = skb->data; 920 u16 dlci; 921 struct pvc_device *pvc; 922 struct net_device *dev; 923 924 if (skb->len < 4 || fh->ea1 || !fh->ea2 || data[2] != FR_UI) 925 goto rx_error; 926 927 dlci = q922_to_dlci(skb->data); 928 929 if ((dlci == LMI_CCITT_ANSI_DLCI && 930 (state(hdlc)->settings.lmi == LMI_ANSI || 931 state(hdlc)->settings.lmi == LMI_CCITT)) || 932 (dlci == LMI_CISCO_DLCI && 933 state(hdlc)->settings.lmi == LMI_CISCO)) { 934 if (fr_lmi_recv(frad, skb)) 935 goto rx_error; 936 dev_kfree_skb_any(skb); 937 return NET_RX_SUCCESS; 938 } 939 940 pvc = find_pvc(hdlc, dlci); 941 if (!pvc) { 942 #ifdef DEBUG_PKT 943 netdev_info(frad, "No PVC for received frame's DLCI %d\n", 944 dlci); 945 #endif 946 goto rx_drop; 947 } 948 949 if (pvc->state.fecn != fh->fecn) { 950 #ifdef DEBUG_ECN 951 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name, 952 dlci, fh->fecn ? "N" : "FF"); 953 #endif 954 pvc->state.fecn ^= 1; 955 } 956 957 if (pvc->state.becn != fh->becn) { 958 #ifdef DEBUG_ECN 959 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name, 960 dlci, fh->becn ? "N" : "FF"); 961 #endif 962 pvc->state.becn ^= 1; 963 } 964 965 966 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { 967 frad->stats.rx_dropped++; 968 return NET_RX_DROP; 969 } 970 971 if (data[3] == NLPID_IP) { 972 if (!pvc->main) 973 goto rx_drop; 974 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 975 skb->dev = pvc->main; 976 skb->protocol = htons(ETH_P_IP); 977 skb_reset_mac_header(skb); 978 979 } else if (data[3] == NLPID_IPV6) { 980 if (!pvc->main) 981 goto rx_drop; 982 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 983 skb->dev = pvc->main; 984 skb->protocol = htons(ETH_P_IPV6); 985 skb_reset_mac_header(skb); 986 987 } else if (data[3] == FR_PAD) { 988 if (skb->len < 5) 989 goto rx_error; 990 if (data[4] == NLPID_SNAP) { /* A SNAP header follows */ 991 skb_pull(skb, 5); 992 if (skb->len < 5) /* Incomplete SNAP header */ 993 goto rx_error; 994 if (fr_snap_parse(skb, pvc)) 995 goto rx_drop; 996 } else { 997 goto rx_drop; 998 } 999 1000 } else { 1001 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n", 1002 data[3], skb->len); 1003 goto rx_drop; 1004 } 1005 1006 dev = skb->dev; 1007 dev->stats.rx_packets++; /* PVC traffic */ 1008 dev->stats.rx_bytes += skb->len; 1009 if (pvc->state.becn) 1010 dev->stats.rx_compressed++; 1011 netif_rx(skb); 1012 return NET_RX_SUCCESS; 1013 1014 rx_error: 1015 frad->stats.rx_errors++; /* Mark error */ 1016 rx_drop: 1017 dev_kfree_skb_any(skb); 1018 return NET_RX_DROP; 1019 } 1020 1021 1022 1023 static void fr_start(struct net_device *dev) 1024 { 1025 hdlc_device *hdlc = dev_to_hdlc(dev); 1026 #ifdef DEBUG_LINK 1027 printk(KERN_DEBUG "fr_start\n"); 1028 #endif 1029 if (state(hdlc)->settings.lmi != LMI_NONE) { 1030 state(hdlc)->reliable = 0; 1031 state(hdlc)->dce_changed = 1; 1032 state(hdlc)->request = 0; 1033 state(hdlc)->fullrep_sent = 0; 1034 state(hdlc)->last_errors = 0xFFFFFFFF; 1035 state(hdlc)->n391cnt = 0; 1036 state(hdlc)->txseq = state(hdlc)->rxseq = 0; 1037 1038 state(hdlc)->dev = dev; 1039 timer_setup(&state(hdlc)->timer, fr_timer, 0); 1040 /* First poll after 1 s */ 1041 state(hdlc)->timer.expires = jiffies + HZ; 1042 add_timer(&state(hdlc)->timer); 1043 } else 1044 fr_set_link_state(1, dev); 1045 } 1046 1047 1048 static void fr_stop(struct net_device *dev) 1049 { 1050 hdlc_device *hdlc = dev_to_hdlc(dev); 1051 #ifdef DEBUG_LINK 1052 printk(KERN_DEBUG "fr_stop\n"); 1053 #endif 1054 if (state(hdlc)->settings.lmi != LMI_NONE) 1055 del_timer_sync(&state(hdlc)->timer); 1056 fr_set_link_state(0, dev); 1057 } 1058 1059 1060 static void fr_close(struct net_device *dev) 1061 { 1062 hdlc_device *hdlc = dev_to_hdlc(dev); 1063 struct pvc_device *pvc = state(hdlc)->first_pvc; 1064 1065 while (pvc) { /* Shutdown all PVCs for this FRAD */ 1066 if (pvc->main) 1067 dev_close(pvc->main); 1068 if (pvc->ether) 1069 dev_close(pvc->ether); 1070 pvc = pvc->next; 1071 } 1072 } 1073 1074 1075 static void pvc_setup(struct net_device *dev) 1076 { 1077 dev->type = ARPHRD_DLCI; 1078 dev->flags = IFF_POINTOPOINT; 1079 dev->hard_header_len = 0; 1080 dev->addr_len = 2; 1081 netif_keep_dst(dev); 1082 } 1083 1084 static const struct net_device_ops pvc_ops = { 1085 .ndo_open = pvc_open, 1086 .ndo_stop = pvc_close, 1087 .ndo_start_xmit = pvc_xmit, 1088 .ndo_do_ioctl = pvc_ioctl, 1089 }; 1090 1091 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type) 1092 { 1093 hdlc_device *hdlc = dev_to_hdlc(frad); 1094 struct pvc_device *pvc; 1095 struct net_device *dev; 1096 int used; 1097 1098 if ((pvc = add_pvc(frad, dlci)) == NULL) { 1099 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n"); 1100 return -ENOBUFS; 1101 } 1102 1103 if (*get_dev_p(pvc, type)) 1104 return -EEXIST; 1105 1106 used = pvc_is_used(pvc); 1107 1108 if (type == ARPHRD_ETHER) 1109 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN, 1110 ether_setup); 1111 else 1112 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup); 1113 1114 if (!dev) { 1115 netdev_warn(frad, "Memory squeeze on fr_pvc()\n"); 1116 delete_unused_pvcs(hdlc); 1117 return -ENOBUFS; 1118 } 1119 1120 if (type == ARPHRD_ETHER) { 1121 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1122 eth_hw_addr_random(dev); 1123 } else { 1124 *(__be16*)dev->dev_addr = htons(dlci); 1125 dlci_to_q922(dev->broadcast, dlci); 1126 } 1127 dev->netdev_ops = &pvc_ops; 1128 dev->mtu = HDLC_MAX_MTU; 1129 dev->min_mtu = 68; 1130 dev->max_mtu = HDLC_MAX_MTU; 1131 dev->needed_headroom = 10; 1132 dev->priv_flags |= IFF_NO_QUEUE; 1133 dev->ml_priv = pvc; 1134 1135 if (register_netdevice(dev) != 0) { 1136 free_netdev(dev); 1137 delete_unused_pvcs(hdlc); 1138 return -EIO; 1139 } 1140 1141 dev->needs_free_netdev = true; 1142 *get_dev_p(pvc, type) = dev; 1143 if (!used) { 1144 state(hdlc)->dce_changed = 1; 1145 state(hdlc)->dce_pvc_count++; 1146 } 1147 return 0; 1148 } 1149 1150 1151 1152 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type) 1153 { 1154 struct pvc_device *pvc; 1155 struct net_device *dev; 1156 1157 if ((pvc = find_pvc(hdlc, dlci)) == NULL) 1158 return -ENOENT; 1159 1160 if ((dev = *get_dev_p(pvc, type)) == NULL) 1161 return -ENOENT; 1162 1163 if (dev->flags & IFF_UP) 1164 return -EBUSY; /* PVC in use */ 1165 1166 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */ 1167 *get_dev_p(pvc, type) = NULL; 1168 1169 if (!pvc_is_used(pvc)) { 1170 state(hdlc)->dce_pvc_count--; 1171 state(hdlc)->dce_changed = 1; 1172 } 1173 delete_unused_pvcs(hdlc); 1174 return 0; 1175 } 1176 1177 1178 1179 static void fr_destroy(struct net_device *frad) 1180 { 1181 hdlc_device *hdlc = dev_to_hdlc(frad); 1182 struct pvc_device *pvc = state(hdlc)->first_pvc; 1183 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */ 1184 state(hdlc)->dce_pvc_count = 0; 1185 state(hdlc)->dce_changed = 1; 1186 1187 while (pvc) { 1188 struct pvc_device *next = pvc->next; 1189 /* destructors will free_netdev() main and ether */ 1190 if (pvc->main) 1191 unregister_netdevice(pvc->main); 1192 1193 if (pvc->ether) 1194 unregister_netdevice(pvc->ether); 1195 1196 kfree(pvc); 1197 pvc = next; 1198 } 1199 } 1200 1201 1202 static struct hdlc_proto proto = { 1203 .close = fr_close, 1204 .start = fr_start, 1205 .stop = fr_stop, 1206 .detach = fr_destroy, 1207 .ioctl = fr_ioctl, 1208 .netif_rx = fr_rx, 1209 .module = THIS_MODULE, 1210 }; 1211 1212 1213 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr) 1214 { 1215 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr; 1216 const size_t size = sizeof(fr_proto); 1217 fr_proto new_settings; 1218 hdlc_device *hdlc = dev_to_hdlc(dev); 1219 fr_proto_pvc pvc; 1220 int result; 1221 1222 switch (ifr->ifr_settings.type) { 1223 case IF_GET_PROTO: 1224 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1225 return -EINVAL; 1226 ifr->ifr_settings.type = IF_PROTO_FR; 1227 if (ifr->ifr_settings.size < size) { 1228 ifr->ifr_settings.size = size; /* data size wanted */ 1229 return -ENOBUFS; 1230 } 1231 if (copy_to_user(fr_s, &state(hdlc)->settings, size)) 1232 return -EFAULT; 1233 return 0; 1234 1235 case IF_PROTO_FR: 1236 if (!capable(CAP_NET_ADMIN)) 1237 return -EPERM; 1238 1239 if (dev->flags & IFF_UP) 1240 return -EBUSY; 1241 1242 if (copy_from_user(&new_settings, fr_s, size)) 1243 return -EFAULT; 1244 1245 if (new_settings.lmi == LMI_DEFAULT) 1246 new_settings.lmi = LMI_ANSI; 1247 1248 if ((new_settings.lmi != LMI_NONE && 1249 new_settings.lmi != LMI_ANSI && 1250 new_settings.lmi != LMI_CCITT && 1251 new_settings.lmi != LMI_CISCO) || 1252 new_settings.t391 < 1 || 1253 new_settings.t392 < 2 || 1254 new_settings.n391 < 1 || 1255 new_settings.n392 < 1 || 1256 new_settings.n393 < new_settings.n392 || 1257 new_settings.n393 > 32 || 1258 (new_settings.dce != 0 && 1259 new_settings.dce != 1)) 1260 return -EINVAL; 1261 1262 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); 1263 if (result) 1264 return result; 1265 1266 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */ 1267 result = attach_hdlc_protocol(dev, &proto, 1268 sizeof(struct frad_state)); 1269 if (result) 1270 return result; 1271 state(hdlc)->first_pvc = NULL; 1272 state(hdlc)->dce_pvc_count = 0; 1273 } 1274 memcpy(&state(hdlc)->settings, &new_settings, size); 1275 dev->type = ARPHRD_FRAD; 1276 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); 1277 return 0; 1278 1279 case IF_PROTO_FR_ADD_PVC: 1280 case IF_PROTO_FR_DEL_PVC: 1281 case IF_PROTO_FR_ADD_ETH_PVC: 1282 case IF_PROTO_FR_DEL_ETH_PVC: 1283 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1284 return -EINVAL; 1285 1286 if (!capable(CAP_NET_ADMIN)) 1287 return -EPERM; 1288 1289 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc, 1290 sizeof(fr_proto_pvc))) 1291 return -EFAULT; 1292 1293 if (pvc.dlci <= 0 || pvc.dlci >= 1024) 1294 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */ 1295 1296 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC || 1297 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC) 1298 result = ARPHRD_ETHER; /* bridged Ethernet device */ 1299 else 1300 result = ARPHRD_DLCI; 1301 1302 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC || 1303 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC) 1304 return fr_add_pvc(dev, pvc.dlci, result); 1305 else 1306 return fr_del_pvc(hdlc, pvc.dlci, result); 1307 } 1308 1309 return -EINVAL; 1310 } 1311 1312 1313 static int __init mod_init(void) 1314 { 1315 register_hdlc_protocol(&proto); 1316 return 0; 1317 } 1318 1319 1320 static void __exit mod_exit(void) 1321 { 1322 unregister_hdlc_protocol(&proto); 1323 } 1324 1325 1326 module_init(mod_init); 1327 module_exit(mod_exit); 1328 1329 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 1330 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC"); 1331 MODULE_LICENSE("GPL v2"); 1332