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 } 873 874 875 static int fr_rx(struct sk_buff *skb) 876 { 877 struct net_device *frad = skb->dev; 878 hdlc_device *hdlc = dev_to_hdlc(frad); 879 struct fr_hdr *fh = (struct fr_hdr *)skb->data; 880 u8 *data = skb->data; 881 u16 dlci; 882 struct pvc_device *pvc; 883 struct net_device *dev = NULL; 884 885 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI) 886 goto rx_error; 887 888 dlci = q922_to_dlci(skb->data); 889 890 if ((dlci == LMI_CCITT_ANSI_DLCI && 891 (state(hdlc)->settings.lmi == LMI_ANSI || 892 state(hdlc)->settings.lmi == LMI_CCITT)) || 893 (dlci == LMI_CISCO_DLCI && 894 state(hdlc)->settings.lmi == LMI_CISCO)) { 895 if (fr_lmi_recv(frad, skb)) 896 goto rx_error; 897 dev_kfree_skb_any(skb); 898 return NET_RX_SUCCESS; 899 } 900 901 pvc = find_pvc(hdlc, dlci); 902 if (!pvc) { 903 #ifdef DEBUG_PKT 904 netdev_info(frad, "No PVC for received frame's DLCI %d\n", 905 dlci); 906 #endif 907 dev_kfree_skb_any(skb); 908 return NET_RX_DROP; 909 } 910 911 if (pvc->state.fecn != fh->fecn) { 912 #ifdef DEBUG_ECN 913 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name, 914 dlci, fh->fecn ? "N" : "FF"); 915 #endif 916 pvc->state.fecn ^= 1; 917 } 918 919 if (pvc->state.becn != fh->becn) { 920 #ifdef DEBUG_ECN 921 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name, 922 dlci, fh->becn ? "N" : "FF"); 923 #endif 924 pvc->state.becn ^= 1; 925 } 926 927 928 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { 929 frad->stats.rx_dropped++; 930 return NET_RX_DROP; 931 } 932 933 if (data[3] == NLPID_IP) { 934 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 935 dev = pvc->main; 936 skb->protocol = htons(ETH_P_IP); 937 938 } else if (data[3] == NLPID_IPV6) { 939 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 940 dev = pvc->main; 941 skb->protocol = htons(ETH_P_IPV6); 942 943 } else if (skb->len > 10 && data[3] == FR_PAD && 944 data[4] == NLPID_SNAP && data[5] == FR_PAD) { 945 u16 oui = ntohs(*(__be16*)(data + 6)); 946 u16 pid = ntohs(*(__be16*)(data + 8)); 947 skb_pull(skb, 10); 948 949 switch ((((u32)oui) << 16) | pid) { 950 case ETH_P_ARP: /* routed frame with SNAP */ 951 case ETH_P_IPX: 952 case ETH_P_IP: /* a long variant */ 953 case ETH_P_IPV6: 954 dev = pvc->main; 955 skb->protocol = htons(pid); 956 break; 957 958 case 0x80C20007: /* bridged Ethernet frame */ 959 if ((dev = pvc->ether) != NULL) 960 skb->protocol = eth_type_trans(skb, dev); 961 break; 962 963 default: 964 netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n", 965 oui, pid); 966 dev_kfree_skb_any(skb); 967 return NET_RX_DROP; 968 } 969 } else { 970 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n", 971 data[3], skb->len); 972 dev_kfree_skb_any(skb); 973 return NET_RX_DROP; 974 } 975 976 if (dev) { 977 dev->stats.rx_packets++; /* PVC traffic */ 978 dev->stats.rx_bytes += skb->len; 979 if (pvc->state.becn) 980 dev->stats.rx_compressed++; 981 skb->dev = dev; 982 netif_rx(skb); 983 return NET_RX_SUCCESS; 984 } else { 985 dev_kfree_skb_any(skb); 986 return NET_RX_DROP; 987 } 988 989 rx_error: 990 frad->stats.rx_errors++; /* Mark error */ 991 dev_kfree_skb_any(skb); 992 return NET_RX_DROP; 993 } 994 995 996 997 static void fr_start(struct net_device *dev) 998 { 999 hdlc_device *hdlc = dev_to_hdlc(dev); 1000 #ifdef DEBUG_LINK 1001 printk(KERN_DEBUG "fr_start\n"); 1002 #endif 1003 if (state(hdlc)->settings.lmi != LMI_NONE) { 1004 state(hdlc)->reliable = 0; 1005 state(hdlc)->dce_changed = 1; 1006 state(hdlc)->request = 0; 1007 state(hdlc)->fullrep_sent = 0; 1008 state(hdlc)->last_errors = 0xFFFFFFFF; 1009 state(hdlc)->n391cnt = 0; 1010 state(hdlc)->txseq = state(hdlc)->rxseq = 0; 1011 1012 state(hdlc)->dev = dev; 1013 timer_setup(&state(hdlc)->timer, fr_timer, 0); 1014 /* First poll after 1 s */ 1015 state(hdlc)->timer.expires = jiffies + HZ; 1016 add_timer(&state(hdlc)->timer); 1017 } else 1018 fr_set_link_state(1, dev); 1019 } 1020 1021 1022 static void fr_stop(struct net_device *dev) 1023 { 1024 hdlc_device *hdlc = dev_to_hdlc(dev); 1025 #ifdef DEBUG_LINK 1026 printk(KERN_DEBUG "fr_stop\n"); 1027 #endif 1028 if (state(hdlc)->settings.lmi != LMI_NONE) 1029 del_timer_sync(&state(hdlc)->timer); 1030 fr_set_link_state(0, dev); 1031 } 1032 1033 1034 static void fr_close(struct net_device *dev) 1035 { 1036 hdlc_device *hdlc = dev_to_hdlc(dev); 1037 struct pvc_device *pvc = state(hdlc)->first_pvc; 1038 1039 while (pvc) { /* Shutdown all PVCs for this FRAD */ 1040 if (pvc->main) 1041 dev_close(pvc->main); 1042 if (pvc->ether) 1043 dev_close(pvc->ether); 1044 pvc = pvc->next; 1045 } 1046 } 1047 1048 1049 static void pvc_setup(struct net_device *dev) 1050 { 1051 dev->type = ARPHRD_DLCI; 1052 dev->flags = IFF_POINTOPOINT; 1053 dev->hard_header_len = 0; 1054 dev->addr_len = 2; 1055 netif_keep_dst(dev); 1056 } 1057 1058 static const struct net_device_ops pvc_ops = { 1059 .ndo_open = pvc_open, 1060 .ndo_stop = pvc_close, 1061 .ndo_start_xmit = pvc_xmit, 1062 .ndo_do_ioctl = pvc_ioctl, 1063 }; 1064 1065 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type) 1066 { 1067 hdlc_device *hdlc = dev_to_hdlc(frad); 1068 struct pvc_device *pvc; 1069 struct net_device *dev; 1070 int used; 1071 1072 if ((pvc = add_pvc(frad, dlci)) == NULL) { 1073 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n"); 1074 return -ENOBUFS; 1075 } 1076 1077 if (*get_dev_p(pvc, type)) 1078 return -EEXIST; 1079 1080 used = pvc_is_used(pvc); 1081 1082 if (type == ARPHRD_ETHER) 1083 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN, 1084 ether_setup); 1085 else 1086 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup); 1087 1088 if (!dev) { 1089 netdev_warn(frad, "Memory squeeze on fr_pvc()\n"); 1090 delete_unused_pvcs(hdlc); 1091 return -ENOBUFS; 1092 } 1093 1094 if (type == ARPHRD_ETHER) { 1095 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1096 eth_hw_addr_random(dev); 1097 } else { 1098 *(__be16*)dev->dev_addr = htons(dlci); 1099 dlci_to_q922(dev->broadcast, dlci); 1100 } 1101 dev->netdev_ops = &pvc_ops; 1102 dev->mtu = HDLC_MAX_MTU; 1103 dev->min_mtu = 68; 1104 dev->max_mtu = HDLC_MAX_MTU; 1105 dev->needed_headroom = 10; 1106 dev->priv_flags |= IFF_NO_QUEUE; 1107 dev->ml_priv = pvc; 1108 1109 if (register_netdevice(dev) != 0) { 1110 free_netdev(dev); 1111 delete_unused_pvcs(hdlc); 1112 return -EIO; 1113 } 1114 1115 dev->needs_free_netdev = true; 1116 *get_dev_p(pvc, type) = dev; 1117 if (!used) { 1118 state(hdlc)->dce_changed = 1; 1119 state(hdlc)->dce_pvc_count++; 1120 } 1121 return 0; 1122 } 1123 1124 1125 1126 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type) 1127 { 1128 struct pvc_device *pvc; 1129 struct net_device *dev; 1130 1131 if ((pvc = find_pvc(hdlc, dlci)) == NULL) 1132 return -ENOENT; 1133 1134 if ((dev = *get_dev_p(pvc, type)) == NULL) 1135 return -ENOENT; 1136 1137 if (dev->flags & IFF_UP) 1138 return -EBUSY; /* PVC in use */ 1139 1140 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */ 1141 *get_dev_p(pvc, type) = NULL; 1142 1143 if (!pvc_is_used(pvc)) { 1144 state(hdlc)->dce_pvc_count--; 1145 state(hdlc)->dce_changed = 1; 1146 } 1147 delete_unused_pvcs(hdlc); 1148 return 0; 1149 } 1150 1151 1152 1153 static void fr_destroy(struct net_device *frad) 1154 { 1155 hdlc_device *hdlc = dev_to_hdlc(frad); 1156 struct pvc_device *pvc = state(hdlc)->first_pvc; 1157 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */ 1158 state(hdlc)->dce_pvc_count = 0; 1159 state(hdlc)->dce_changed = 1; 1160 1161 while (pvc) { 1162 struct pvc_device *next = pvc->next; 1163 /* destructors will free_netdev() main and ether */ 1164 if (pvc->main) 1165 unregister_netdevice(pvc->main); 1166 1167 if (pvc->ether) 1168 unregister_netdevice(pvc->ether); 1169 1170 kfree(pvc); 1171 pvc = next; 1172 } 1173 } 1174 1175 1176 static struct hdlc_proto proto = { 1177 .close = fr_close, 1178 .start = fr_start, 1179 .stop = fr_stop, 1180 .detach = fr_destroy, 1181 .ioctl = fr_ioctl, 1182 .netif_rx = fr_rx, 1183 .module = THIS_MODULE, 1184 }; 1185 1186 1187 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr) 1188 { 1189 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr; 1190 const size_t size = sizeof(fr_proto); 1191 fr_proto new_settings; 1192 hdlc_device *hdlc = dev_to_hdlc(dev); 1193 fr_proto_pvc pvc; 1194 int result; 1195 1196 switch (ifr->ifr_settings.type) { 1197 case IF_GET_PROTO: 1198 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1199 return -EINVAL; 1200 ifr->ifr_settings.type = IF_PROTO_FR; 1201 if (ifr->ifr_settings.size < size) { 1202 ifr->ifr_settings.size = size; /* data size wanted */ 1203 return -ENOBUFS; 1204 } 1205 if (copy_to_user(fr_s, &state(hdlc)->settings, size)) 1206 return -EFAULT; 1207 return 0; 1208 1209 case IF_PROTO_FR: 1210 if (!capable(CAP_NET_ADMIN)) 1211 return -EPERM; 1212 1213 if (dev->flags & IFF_UP) 1214 return -EBUSY; 1215 1216 if (copy_from_user(&new_settings, fr_s, size)) 1217 return -EFAULT; 1218 1219 if (new_settings.lmi == LMI_DEFAULT) 1220 new_settings.lmi = LMI_ANSI; 1221 1222 if ((new_settings.lmi != LMI_NONE && 1223 new_settings.lmi != LMI_ANSI && 1224 new_settings.lmi != LMI_CCITT && 1225 new_settings.lmi != LMI_CISCO) || 1226 new_settings.t391 < 1 || 1227 new_settings.t392 < 2 || 1228 new_settings.n391 < 1 || 1229 new_settings.n392 < 1 || 1230 new_settings.n393 < new_settings.n392 || 1231 new_settings.n393 > 32 || 1232 (new_settings.dce != 0 && 1233 new_settings.dce != 1)) 1234 return -EINVAL; 1235 1236 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); 1237 if (result) 1238 return result; 1239 1240 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */ 1241 result = attach_hdlc_protocol(dev, &proto, 1242 sizeof(struct frad_state)); 1243 if (result) 1244 return result; 1245 state(hdlc)->first_pvc = NULL; 1246 state(hdlc)->dce_pvc_count = 0; 1247 } 1248 memcpy(&state(hdlc)->settings, &new_settings, size); 1249 dev->type = ARPHRD_FRAD; 1250 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); 1251 return 0; 1252 1253 case IF_PROTO_FR_ADD_PVC: 1254 case IF_PROTO_FR_DEL_PVC: 1255 case IF_PROTO_FR_ADD_ETH_PVC: 1256 case IF_PROTO_FR_DEL_ETH_PVC: 1257 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1258 return -EINVAL; 1259 1260 if (!capable(CAP_NET_ADMIN)) 1261 return -EPERM; 1262 1263 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc, 1264 sizeof(fr_proto_pvc))) 1265 return -EFAULT; 1266 1267 if (pvc.dlci <= 0 || pvc.dlci >= 1024) 1268 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */ 1269 1270 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC || 1271 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC) 1272 result = ARPHRD_ETHER; /* bridged Ethernet device */ 1273 else 1274 result = ARPHRD_DLCI; 1275 1276 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC || 1277 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC) 1278 return fr_add_pvc(dev, pvc.dlci, result); 1279 else 1280 return fr_del_pvc(hdlc, pvc.dlci, result); 1281 } 1282 1283 return -EINVAL; 1284 } 1285 1286 1287 static int __init mod_init(void) 1288 { 1289 register_hdlc_protocol(&proto); 1290 return 0; 1291 } 1292 1293 1294 static void __exit mod_exit(void) 1295 { 1296 unregister_hdlc_protocol(&proto); 1297 } 1298 1299 1300 module_init(mod_init); 1301 module_exit(mod_exit); 1302 1303 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 1304 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC"); 1305 MODULE_LICENSE("GPL v2"); 1306