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 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */ 64 #define LMI_CISCO_DLCI 1023 65 66 #define LMI_CALLREF 0x00 /* Call Reference */ 67 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */ 68 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */ 69 #define LMI_CCITT_REPTYPE 0x51 70 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */ 71 #define LMI_CCITT_ALIVE 0x53 72 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */ 73 #define LMI_CCITT_PVCSTAT 0x57 74 75 #define LMI_FULLREP 0x00 /* full report */ 76 #define LMI_INTEGRITY 0x01 /* link integrity report */ 77 #define LMI_SINGLE 0x02 /* single PVC report */ 78 79 #define LMI_STATUS_ENQUIRY 0x75 80 #define LMI_STATUS 0x7D /* reply */ 81 82 #define LMI_REPT_LEN 1 /* report type element length */ 83 #define LMI_INTEG_LEN 2 /* link integrity element length */ 84 85 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */ 86 #define LMI_ANSI_LENGTH 14 87 88 struct fr_hdr { 89 #if defined(__LITTLE_ENDIAN_BITFIELD) 90 unsigned ea1: 1; 91 unsigned cr: 1; 92 unsigned dlcih: 6; 93 94 unsigned ea2: 1; 95 unsigned de: 1; 96 unsigned becn: 1; 97 unsigned fecn: 1; 98 unsigned dlcil: 4; 99 #else 100 unsigned dlcih: 6; 101 unsigned cr: 1; 102 unsigned ea1: 1; 103 104 unsigned dlcil: 4; 105 unsigned fecn: 1; 106 unsigned becn: 1; 107 unsigned de: 1; 108 unsigned ea2: 1; 109 #endif 110 } __packed; 111 112 struct pvc_device { 113 struct net_device *frad; 114 struct net_device *main; 115 struct net_device *ether; /* bridged Ethernet interface */ 116 struct pvc_device *next; /* Sorted in ascending DLCI order */ 117 int dlci; 118 int open_count; 119 120 struct { 121 unsigned int new: 1; 122 unsigned int active: 1; 123 unsigned int exist: 1; 124 unsigned int deleted: 1; 125 unsigned int fecn: 1; 126 unsigned int becn: 1; 127 unsigned int bandwidth; /* Cisco LMI reporting only */ 128 } state; 129 }; 130 131 struct frad_state { 132 fr_proto settings; 133 struct pvc_device *first_pvc; 134 int dce_pvc_count; 135 136 struct timer_list timer; 137 struct net_device *dev; 138 unsigned long last_poll; 139 int reliable; 140 int dce_changed; 141 int request; 142 int fullrep_sent; 143 u32 last_errors; /* last errors bit list */ 144 u8 n391cnt; 145 u8 txseq; /* TX sequence number */ 146 u8 rxseq; /* RX sequence number */ 147 }; 148 149 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr); 150 151 static inline u16 q922_to_dlci(u8 *hdr) 152 { 153 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4); 154 } 155 156 static inline void dlci_to_q922(u8 *hdr, u16 dlci) 157 { 158 hdr[0] = (dlci >> 2) & 0xFC; 159 hdr[1] = ((dlci << 4) & 0xF0) | 0x01; 160 } 161 162 static inline struct frad_state *state(hdlc_device *hdlc) 163 { 164 return (struct frad_state *)(hdlc->state); 165 } 166 167 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci) 168 { 169 struct pvc_device *pvc = state(hdlc)->first_pvc; 170 171 while (pvc) { 172 if (pvc->dlci == dlci) 173 return pvc; 174 if (pvc->dlci > dlci) 175 return NULL; /* the list is sorted */ 176 pvc = pvc->next; 177 } 178 179 return NULL; 180 } 181 182 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci) 183 { 184 hdlc_device *hdlc = dev_to_hdlc(dev); 185 struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc; 186 187 while (*pvc_p) { 188 if ((*pvc_p)->dlci == dlci) 189 return *pvc_p; 190 if ((*pvc_p)->dlci > dlci) 191 break; /* the list is sorted */ 192 pvc_p = &(*pvc_p)->next; 193 } 194 195 pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC); 196 #ifdef DEBUG_PVC 197 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev); 198 #endif 199 if (!pvc) 200 return NULL; 201 202 pvc->dlci = dlci; 203 pvc->frad = dev; 204 pvc->next = *pvc_p; /* Put it in the chain */ 205 *pvc_p = pvc; 206 return pvc; 207 } 208 209 static inline int pvc_is_used(struct pvc_device *pvc) 210 { 211 return pvc->main || pvc->ether; 212 } 213 214 static inline void pvc_carrier(int on, struct pvc_device *pvc) 215 { 216 if (on) { 217 if (pvc->main) 218 if (!netif_carrier_ok(pvc->main)) 219 netif_carrier_on(pvc->main); 220 if (pvc->ether) 221 if (!netif_carrier_ok(pvc->ether)) 222 netif_carrier_on(pvc->ether); 223 } else { 224 if (pvc->main) 225 if (netif_carrier_ok(pvc->main)) 226 netif_carrier_off(pvc->main); 227 if (pvc->ether) 228 if (netif_carrier_ok(pvc->ether)) 229 netif_carrier_off(pvc->ether); 230 } 231 } 232 233 static inline void delete_unused_pvcs(hdlc_device *hdlc) 234 { 235 struct pvc_device **pvc_p = &state(hdlc)->first_pvc; 236 237 while (*pvc_p) { 238 if (!pvc_is_used(*pvc_p)) { 239 struct pvc_device *pvc = *pvc_p; 240 #ifdef DEBUG_PVC 241 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc); 242 #endif 243 *pvc_p = pvc->next; 244 kfree(pvc); 245 continue; 246 } 247 pvc_p = &(*pvc_p)->next; 248 } 249 } 250 251 static inline struct net_device **get_dev_p(struct pvc_device *pvc, 252 int type) 253 { 254 if (type == ARPHRD_ETHER) 255 return &pvc->ether; 256 else 257 return &pvc->main; 258 } 259 260 static int fr_hard_header(struct sk_buff *skb, u16 dlci) 261 { 262 if (!skb->dev) { /* Control packets */ 263 switch (dlci) { 264 case LMI_CCITT_ANSI_DLCI: 265 skb_push(skb, 4); 266 skb->data[3] = NLPID_CCITT_ANSI_LMI; 267 break; 268 269 case LMI_CISCO_DLCI: 270 skb_push(skb, 4); 271 skb->data[3] = NLPID_CISCO_LMI; 272 break; 273 274 default: 275 return -EINVAL; 276 } 277 278 } else if (skb->dev->type == ARPHRD_DLCI) { 279 switch (skb->protocol) { 280 case htons(ETH_P_IP): 281 skb_push(skb, 4); 282 skb->data[3] = NLPID_IP; 283 break; 284 285 case htons(ETH_P_IPV6): 286 skb_push(skb, 4); 287 skb->data[3] = NLPID_IPV6; 288 break; 289 290 default: 291 skb_push(skb, 10); 292 skb->data[3] = FR_PAD; 293 skb->data[4] = NLPID_SNAP; 294 /* OUI 00-00-00 indicates an Ethertype follows */ 295 skb->data[5] = 0x00; 296 skb->data[6] = 0x00; 297 skb->data[7] = 0x00; 298 /* This should be an Ethertype: */ 299 *(__be16 *)(skb->data + 8) = skb->protocol; 300 } 301 302 } else if (skb->dev->type == ARPHRD_ETHER) { 303 skb_push(skb, 10); 304 skb->data[3] = FR_PAD; 305 skb->data[4] = NLPID_SNAP; 306 /* OUI 00-80-C2 stands for the 802.1 organization */ 307 skb->data[5] = 0x00; 308 skb->data[6] = 0x80; 309 skb->data[7] = 0xC2; 310 /* PID 00-07 stands for Ethernet frames without FCS */ 311 skb->data[8] = 0x00; 312 skb->data[9] = 0x07; 313 314 } else { 315 return -EINVAL; 316 } 317 318 dlci_to_q922(skb->data, dlci); 319 skb->data[2] = FR_UI; 320 return 0; 321 } 322 323 static int pvc_open(struct net_device *dev) 324 { 325 struct pvc_device *pvc = dev->ml_priv; 326 327 if ((pvc->frad->flags & IFF_UP) == 0) 328 return -EIO; /* Frad must be UP in order to activate PVC */ 329 330 if (pvc->open_count++ == 0) { 331 hdlc_device *hdlc = dev_to_hdlc(pvc->frad); 332 333 if (state(hdlc)->settings.lmi == LMI_NONE) 334 pvc->state.active = netif_carrier_ok(pvc->frad); 335 336 pvc_carrier(pvc->state.active, pvc); 337 state(hdlc)->dce_changed = 1; 338 } 339 return 0; 340 } 341 342 static int pvc_close(struct net_device *dev) 343 { 344 struct pvc_device *pvc = dev->ml_priv; 345 346 if (--pvc->open_count == 0) { 347 hdlc_device *hdlc = dev_to_hdlc(pvc->frad); 348 349 if (state(hdlc)->settings.lmi == LMI_NONE) 350 pvc->state.active = 0; 351 352 if (state(hdlc)->settings.dce) { 353 state(hdlc)->dce_changed = 1; 354 pvc->state.active = 0; 355 } 356 } 357 return 0; 358 } 359 360 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 361 { 362 struct pvc_device *pvc = dev->ml_priv; 363 fr_proto_pvc_info info; 364 365 if (ifr->ifr_settings.type == IF_GET_PROTO) { 366 if (dev->type == ARPHRD_ETHER) 367 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC; 368 else 369 ifr->ifr_settings.type = IF_PROTO_FR_PVC; 370 371 if (ifr->ifr_settings.size < sizeof(info)) { 372 /* data size wanted */ 373 ifr->ifr_settings.size = sizeof(info); 374 return -ENOBUFS; 375 } 376 377 info.dlci = pvc->dlci; 378 memcpy(info.master, pvc->frad->name, IFNAMSIZ); 379 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info, 380 &info, sizeof(info))) 381 return -EFAULT; 382 return 0; 383 } 384 385 return -EINVAL; 386 } 387 388 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev) 389 { 390 struct pvc_device *pvc = dev->ml_priv; 391 392 if (!pvc->state.active) 393 goto drop; 394 395 if (dev->type == ARPHRD_ETHER) { 396 int pad = ETH_ZLEN - skb->len; 397 398 if (pad > 0) { /* Pad the frame with zeros */ 399 if (__skb_pad(skb, pad, false)) 400 goto drop; 401 skb_put(skb, pad); 402 } 403 } 404 405 /* We already requested the header space with dev->needed_headroom. 406 * So this is just a protection in case the upper layer didn't take 407 * dev->needed_headroom into consideration. 408 */ 409 if (skb_headroom(skb) < 10) { 410 struct sk_buff *skb2 = skb_realloc_headroom(skb, 10); 411 412 if (!skb2) 413 goto drop; 414 dev_kfree_skb(skb); 415 skb = skb2; 416 } 417 418 skb->dev = dev; 419 if (fr_hard_header(skb, pvc->dlci)) 420 goto drop; 421 422 dev->stats.tx_bytes += skb->len; 423 dev->stats.tx_packets++; 424 if (pvc->state.fecn) /* TX Congestion counter */ 425 dev->stats.tx_compressed++; 426 skb->dev = pvc->frad; 427 skb->protocol = htons(ETH_P_HDLC); 428 skb_reset_network_header(skb); 429 dev_queue_xmit(skb); 430 return NETDEV_TX_OK; 431 432 drop: 433 dev->stats.tx_dropped++; 434 kfree_skb(skb); 435 return NETDEV_TX_OK; 436 } 437 438 static inline void fr_log_dlci_active(struct pvc_device *pvc) 439 { 440 netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n", 441 pvc->dlci, 442 pvc->main ? pvc->main->name : "", 443 pvc->main && pvc->ether ? " " : "", 444 pvc->ether ? pvc->ether->name : "", 445 pvc->state.new ? " new" : "", 446 !pvc->state.exist ? "deleted" : 447 pvc->state.active ? "active" : "inactive"); 448 } 449 450 static inline u8 fr_lmi_nextseq(u8 x) 451 { 452 x++; 453 return x ? x : 1; 454 } 455 456 static void fr_lmi_send(struct net_device *dev, int fullrep) 457 { 458 hdlc_device *hdlc = dev_to_hdlc(dev); 459 struct sk_buff *skb; 460 struct pvc_device *pvc = state(hdlc)->first_pvc; 461 int lmi = state(hdlc)->settings.lmi; 462 int dce = state(hdlc)->settings.dce; 463 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH; 464 int stat_len = (lmi == LMI_CISCO) ? 6 : 3; 465 u8 *data; 466 int i = 0; 467 468 if (dce && fullrep) { 469 len += state(hdlc)->dce_pvc_count * (2 + stat_len); 470 if (len > HDLC_MAX_MRU) { 471 netdev_warn(dev, "Too many PVCs while sending LMI full report\n"); 472 return; 473 } 474 } 475 476 skb = dev_alloc_skb(len); 477 if (!skb) 478 return; 479 480 memset(skb->data, 0, len); 481 skb_reserve(skb, 4); 482 if (lmi == LMI_CISCO) 483 fr_hard_header(skb, LMI_CISCO_DLCI); 484 else 485 fr_hard_header(skb, LMI_CCITT_ANSI_DLCI); 486 487 data = skb_tail_pointer(skb); 488 data[i++] = LMI_CALLREF; 489 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY; 490 if (lmi == LMI_ANSI) 491 data[i++] = LMI_ANSI_LOCKSHIFT; 492 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : 493 LMI_ANSI_CISCO_REPTYPE; 494 data[i++] = LMI_REPT_LEN; 495 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY; 496 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE; 497 data[i++] = LMI_INTEG_LEN; 498 data[i++] = state(hdlc)->txseq = 499 fr_lmi_nextseq(state(hdlc)->txseq); 500 data[i++] = state(hdlc)->rxseq; 501 502 if (dce && fullrep) { 503 while (pvc) { 504 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : 505 LMI_ANSI_CISCO_PVCSTAT; 506 data[i++] = stat_len; 507 508 /* LMI start/restart */ 509 if (state(hdlc)->reliable && !pvc->state.exist) { 510 pvc->state.exist = pvc->state.new = 1; 511 fr_log_dlci_active(pvc); 512 } 513 514 /* ifconfig PVC up */ 515 if (pvc->open_count && !pvc->state.active && 516 pvc->state.exist && !pvc->state.new) { 517 pvc_carrier(1, pvc); 518 pvc->state.active = 1; 519 fr_log_dlci_active(pvc); 520 } 521 522 if (lmi == LMI_CISCO) { 523 data[i] = pvc->dlci >> 8; 524 data[i + 1] = pvc->dlci & 0xFF; 525 } else { 526 data[i] = (pvc->dlci >> 4) & 0x3F; 527 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80; 528 data[i + 2] = 0x80; 529 } 530 531 if (pvc->state.new) 532 data[i + 2] |= 0x08; 533 else if (pvc->state.active) 534 data[i + 2] |= 0x02; 535 536 i += stat_len; 537 pvc = pvc->next; 538 } 539 } 540 541 skb_put(skb, i); 542 skb->priority = TC_PRIO_CONTROL; 543 skb->dev = dev; 544 skb->protocol = htons(ETH_P_HDLC); 545 skb_reset_network_header(skb); 546 547 dev_queue_xmit(skb); 548 } 549 550 static void fr_set_link_state(int reliable, struct net_device *dev) 551 { 552 hdlc_device *hdlc = dev_to_hdlc(dev); 553 struct pvc_device *pvc = state(hdlc)->first_pvc; 554 555 state(hdlc)->reliable = reliable; 556 if (reliable) { 557 netif_dormant_off(dev); 558 state(hdlc)->n391cnt = 0; /* Request full status */ 559 state(hdlc)->dce_changed = 1; 560 561 if (state(hdlc)->settings.lmi == LMI_NONE) { 562 while (pvc) { /* Activate all PVCs */ 563 pvc_carrier(1, pvc); 564 pvc->state.exist = pvc->state.active = 1; 565 pvc->state.new = 0; 566 pvc = pvc->next; 567 } 568 } 569 } else { 570 netif_dormant_on(dev); 571 while (pvc) { /* Deactivate all PVCs */ 572 pvc_carrier(0, pvc); 573 pvc->state.exist = pvc->state.active = 0; 574 pvc->state.new = 0; 575 if (!state(hdlc)->settings.dce) 576 pvc->state.bandwidth = 0; 577 pvc = pvc->next; 578 } 579 } 580 } 581 582 static void fr_timer(struct timer_list *t) 583 { 584 struct frad_state *st = from_timer(st, t, timer); 585 struct net_device *dev = st->dev; 586 hdlc_device *hdlc = dev_to_hdlc(dev); 587 int i, cnt = 0, reliable; 588 u32 list; 589 590 if (state(hdlc)->settings.dce) { 591 reliable = state(hdlc)->request && 592 time_before(jiffies, state(hdlc)->last_poll + 593 state(hdlc)->settings.t392 * HZ); 594 state(hdlc)->request = 0; 595 } else { 596 state(hdlc)->last_errors <<= 1; /* Shift the list */ 597 if (state(hdlc)->request) { 598 if (state(hdlc)->reliable) 599 netdev_info(dev, "No LMI status reply received\n"); 600 state(hdlc)->last_errors |= 1; 601 } 602 603 list = state(hdlc)->last_errors; 604 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1) 605 cnt += (list & 1); /* errors count */ 606 607 reliable = (cnt < state(hdlc)->settings.n392); 608 } 609 610 if (state(hdlc)->reliable != reliable) { 611 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un"); 612 fr_set_link_state(reliable, dev); 613 } 614 615 if (state(hdlc)->settings.dce) { 616 state(hdlc)->timer.expires = jiffies + 617 state(hdlc)->settings.t392 * HZ; 618 } else { 619 if (state(hdlc)->n391cnt) 620 state(hdlc)->n391cnt--; 621 622 fr_lmi_send(dev, state(hdlc)->n391cnt == 0); 623 624 state(hdlc)->last_poll = jiffies; 625 state(hdlc)->request = 1; 626 state(hdlc)->timer.expires = jiffies + 627 state(hdlc)->settings.t391 * HZ; 628 } 629 630 add_timer(&state(hdlc)->timer); 631 } 632 633 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb) 634 { 635 hdlc_device *hdlc = dev_to_hdlc(dev); 636 struct pvc_device *pvc; 637 u8 rxseq, txseq; 638 int lmi = state(hdlc)->settings.lmi; 639 int dce = state(hdlc)->settings.dce; 640 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i; 641 642 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH : 643 LMI_CCITT_CISCO_LENGTH)) { 644 netdev_info(dev, "Short LMI frame\n"); 645 return 1; 646 } 647 648 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI : 649 NLPID_CCITT_ANSI_LMI)) { 650 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n"); 651 return 1; 652 } 653 654 if (skb->data[4] != LMI_CALLREF) { 655 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n", 656 skb->data[4]); 657 return 1; 658 } 659 660 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) { 661 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n", 662 skb->data[5]); 663 return 1; 664 } 665 666 if (lmi == LMI_ANSI) { 667 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) { 668 netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n", 669 skb->data[6]); 670 return 1; 671 } 672 i = 7; 673 } else { 674 i = 6; 675 } 676 677 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : 678 LMI_ANSI_CISCO_REPTYPE)) { 679 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n", 680 skb->data[i]); 681 return 1; 682 } 683 684 if (skb->data[++i] != LMI_REPT_LEN) { 685 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n", 686 skb->data[i]); 687 return 1; 688 } 689 690 reptype = skb->data[++i]; 691 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) { 692 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n", 693 reptype); 694 return 1; 695 } 696 697 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE : 698 LMI_ANSI_CISCO_ALIVE)) { 699 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n", 700 skb->data[i]); 701 return 1; 702 } 703 704 if (skb->data[++i] != LMI_INTEG_LEN) { 705 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n", 706 skb->data[i]); 707 return 1; 708 } 709 i++; 710 711 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */ 712 rxseq = skb->data[i++]; /* Should confirm our sequence */ 713 714 txseq = state(hdlc)->txseq; 715 716 if (dce) 717 state(hdlc)->last_poll = jiffies; 718 719 error = 0; 720 if (!state(hdlc)->reliable) 721 error = 1; 722 723 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */ 724 state(hdlc)->n391cnt = 0; 725 error = 1; 726 } 727 728 if (dce) { 729 if (state(hdlc)->fullrep_sent && !error) { 730 /* Stop sending full report - the last one has been confirmed by DTE */ 731 state(hdlc)->fullrep_sent = 0; 732 pvc = state(hdlc)->first_pvc; 733 while (pvc) { 734 if (pvc->state.new) { 735 pvc->state.new = 0; 736 737 /* Tell DTE that new PVC is now active */ 738 state(hdlc)->dce_changed = 1; 739 } 740 pvc = pvc->next; 741 } 742 } 743 744 if (state(hdlc)->dce_changed) { 745 reptype = LMI_FULLREP; 746 state(hdlc)->fullrep_sent = 1; 747 state(hdlc)->dce_changed = 0; 748 } 749 750 state(hdlc)->request = 1; /* got request */ 751 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0); 752 return 0; 753 } 754 755 /* DTE */ 756 757 state(hdlc)->request = 0; /* got response, no request pending */ 758 759 if (error) 760 return 0; 761 762 if (reptype != LMI_FULLREP) 763 return 0; 764 765 pvc = state(hdlc)->first_pvc; 766 767 while (pvc) { 768 pvc->state.deleted = 1; 769 pvc = pvc->next; 770 } 771 772 no_ram = 0; 773 while (skb->len >= i + 2 + stat_len) { 774 u16 dlci; 775 u32 bw; 776 unsigned int active, new; 777 778 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : 779 LMI_ANSI_CISCO_PVCSTAT)) { 780 netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n", 781 skb->data[i]); 782 return 1; 783 } 784 785 if (skb->data[++i] != stat_len) { 786 netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n", 787 skb->data[i]); 788 return 1; 789 } 790 i++; 791 792 new = !!(skb->data[i + 2] & 0x08); 793 active = !!(skb->data[i + 2] & 0x02); 794 if (lmi == LMI_CISCO) { 795 dlci = (skb->data[i] << 8) | skb->data[i + 1]; 796 bw = (skb->data[i + 3] << 16) | 797 (skb->data[i + 4] << 8) | 798 (skb->data[i + 5]); 799 } else { 800 dlci = ((skb->data[i] & 0x3F) << 4) | 801 ((skb->data[i + 1] & 0x78) >> 3); 802 bw = 0; 803 } 804 805 pvc = add_pvc(dev, dlci); 806 807 if (!pvc && !no_ram) { 808 netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n"); 809 no_ram = 1; 810 } 811 812 if (pvc) { 813 pvc->state.exist = 1; 814 pvc->state.deleted = 0; 815 if (active != pvc->state.active || 816 new != pvc->state.new || 817 bw != pvc->state.bandwidth || 818 !pvc->state.exist) { 819 pvc->state.new = new; 820 pvc->state.active = active; 821 pvc->state.bandwidth = bw; 822 pvc_carrier(active, pvc); 823 fr_log_dlci_active(pvc); 824 } 825 } 826 827 i += stat_len; 828 } 829 830 pvc = state(hdlc)->first_pvc; 831 832 while (pvc) { 833 if (pvc->state.deleted && pvc->state.exist) { 834 pvc_carrier(0, pvc); 835 pvc->state.active = pvc->state.new = 0; 836 pvc->state.exist = 0; 837 pvc->state.bandwidth = 0; 838 fr_log_dlci_active(pvc); 839 } 840 pvc = pvc->next; 841 } 842 843 /* Next full report after N391 polls */ 844 state(hdlc)->n391cnt = state(hdlc)->settings.n391; 845 846 return 0; 847 } 848 849 static int fr_snap_parse(struct sk_buff *skb, struct pvc_device *pvc) 850 { 851 /* OUI 00-00-00 indicates an Ethertype follows */ 852 if (skb->data[0] == 0x00 && 853 skb->data[1] == 0x00 && 854 skb->data[2] == 0x00) { 855 if (!pvc->main) 856 return -1; 857 skb->dev = pvc->main; 858 skb->protocol = *(__be16 *)(skb->data + 3); /* Ethertype */ 859 skb_pull(skb, 5); 860 skb_reset_mac_header(skb); 861 return 0; 862 863 /* OUI 00-80-C2 stands for the 802.1 organization */ 864 } else if (skb->data[0] == 0x00 && 865 skb->data[1] == 0x80 && 866 skb->data[2] == 0xC2) { 867 /* PID 00-07 stands for Ethernet frames without FCS */ 868 if (skb->data[3] == 0x00 && 869 skb->data[4] == 0x07) { 870 if (!pvc->ether) 871 return -1; 872 skb_pull(skb, 5); 873 if (skb->len < ETH_HLEN) 874 return -1; 875 skb->protocol = eth_type_trans(skb, pvc->ether); 876 return 0; 877 878 /* PID unsupported */ 879 } else { 880 return -1; 881 } 882 883 /* OUI unsupported */ 884 } else { 885 return -1; 886 } 887 } 888 889 static int fr_rx(struct sk_buff *skb) 890 { 891 struct net_device *frad = skb->dev; 892 hdlc_device *hdlc = dev_to_hdlc(frad); 893 struct fr_hdr *fh = (struct fr_hdr *)skb->data; 894 u8 *data = skb->data; 895 u16 dlci; 896 struct pvc_device *pvc; 897 struct net_device *dev; 898 899 if (skb->len < 4 || fh->ea1 || !fh->ea2 || data[2] != FR_UI) 900 goto rx_error; 901 902 dlci = q922_to_dlci(skb->data); 903 904 if ((dlci == LMI_CCITT_ANSI_DLCI && 905 (state(hdlc)->settings.lmi == LMI_ANSI || 906 state(hdlc)->settings.lmi == LMI_CCITT)) || 907 (dlci == LMI_CISCO_DLCI && 908 state(hdlc)->settings.lmi == LMI_CISCO)) { 909 if (fr_lmi_recv(frad, skb)) 910 goto rx_error; 911 dev_kfree_skb_any(skb); 912 return NET_RX_SUCCESS; 913 } 914 915 pvc = find_pvc(hdlc, dlci); 916 if (!pvc) { 917 #ifdef DEBUG_PKT 918 netdev_info(frad, "No PVC for received frame's DLCI %d\n", 919 dlci); 920 #endif 921 goto rx_drop; 922 } 923 924 if (pvc->state.fecn != fh->fecn) { 925 #ifdef DEBUG_ECN 926 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name, 927 dlci, fh->fecn ? "N" : "FF"); 928 #endif 929 pvc->state.fecn ^= 1; 930 } 931 932 if (pvc->state.becn != fh->becn) { 933 #ifdef DEBUG_ECN 934 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name, 935 dlci, fh->becn ? "N" : "FF"); 936 #endif 937 pvc->state.becn ^= 1; 938 } 939 940 skb = skb_share_check(skb, GFP_ATOMIC); 941 if (!skb) { 942 frad->stats.rx_dropped++; 943 return NET_RX_DROP; 944 } 945 946 if (data[3] == NLPID_IP) { 947 if (!pvc->main) 948 goto rx_drop; 949 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 950 skb->dev = pvc->main; 951 skb->protocol = htons(ETH_P_IP); 952 skb_reset_mac_header(skb); 953 954 } else if (data[3] == NLPID_IPV6) { 955 if (!pvc->main) 956 goto rx_drop; 957 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 958 skb->dev = pvc->main; 959 skb->protocol = htons(ETH_P_IPV6); 960 skb_reset_mac_header(skb); 961 962 } else if (data[3] == FR_PAD) { 963 if (skb->len < 5) 964 goto rx_error; 965 if (data[4] == NLPID_SNAP) { /* A SNAP header follows */ 966 skb_pull(skb, 5); 967 if (skb->len < 5) /* Incomplete SNAP header */ 968 goto rx_error; 969 if (fr_snap_parse(skb, pvc)) 970 goto rx_drop; 971 } else { 972 goto rx_drop; 973 } 974 975 } else { 976 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n", 977 data[3], skb->len); 978 goto rx_drop; 979 } 980 981 dev = skb->dev; 982 dev->stats.rx_packets++; /* PVC traffic */ 983 dev->stats.rx_bytes += skb->len; 984 if (pvc->state.becn) 985 dev->stats.rx_compressed++; 986 netif_rx(skb); 987 return NET_RX_SUCCESS; 988 989 rx_error: 990 frad->stats.rx_errors++; /* Mark error */ 991 rx_drop: 992 dev_kfree_skb_any(skb); 993 return NET_RX_DROP; 994 } 995 996 static void fr_start(struct net_device *dev) 997 { 998 hdlc_device *hdlc = dev_to_hdlc(dev); 999 #ifdef DEBUG_LINK 1000 printk(KERN_DEBUG "fr_start\n"); 1001 #endif 1002 if (state(hdlc)->settings.lmi != LMI_NONE) { 1003 state(hdlc)->reliable = 0; 1004 state(hdlc)->dce_changed = 1; 1005 state(hdlc)->request = 0; 1006 state(hdlc)->fullrep_sent = 0; 1007 state(hdlc)->last_errors = 0xFFFFFFFF; 1008 state(hdlc)->n391cnt = 0; 1009 state(hdlc)->txseq = state(hdlc)->rxseq = 0; 1010 1011 state(hdlc)->dev = dev; 1012 timer_setup(&state(hdlc)->timer, fr_timer, 0); 1013 /* First poll after 1 s */ 1014 state(hdlc)->timer.expires = jiffies + HZ; 1015 add_timer(&state(hdlc)->timer); 1016 } else { 1017 fr_set_link_state(1, dev); 1018 } 1019 } 1020 1021 static void fr_stop(struct net_device *dev) 1022 { 1023 hdlc_device *hdlc = dev_to_hdlc(dev); 1024 #ifdef DEBUG_LINK 1025 printk(KERN_DEBUG "fr_stop\n"); 1026 #endif 1027 if (state(hdlc)->settings.lmi != LMI_NONE) 1028 del_timer_sync(&state(hdlc)->timer); 1029 fr_set_link_state(0, dev); 1030 } 1031 1032 static void fr_close(struct net_device *dev) 1033 { 1034 hdlc_device *hdlc = dev_to_hdlc(dev); 1035 struct pvc_device *pvc = state(hdlc)->first_pvc; 1036 1037 while (pvc) { /* Shutdown all PVCs for this FRAD */ 1038 if (pvc->main) 1039 dev_close(pvc->main); 1040 if (pvc->ether) 1041 dev_close(pvc->ether); 1042 pvc = pvc->next; 1043 } 1044 } 1045 1046 static void pvc_setup(struct net_device *dev) 1047 { 1048 dev->type = ARPHRD_DLCI; 1049 dev->flags = IFF_POINTOPOINT; 1050 dev->hard_header_len = 0; 1051 dev->addr_len = 2; 1052 netif_keep_dst(dev); 1053 } 1054 1055 static const struct net_device_ops pvc_ops = { 1056 .ndo_open = pvc_open, 1057 .ndo_stop = pvc_close, 1058 .ndo_start_xmit = pvc_xmit, 1059 .ndo_do_ioctl = pvc_ioctl, 1060 }; 1061 1062 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type) 1063 { 1064 hdlc_device *hdlc = dev_to_hdlc(frad); 1065 struct pvc_device *pvc; 1066 struct net_device *dev; 1067 int used; 1068 1069 pvc = add_pvc(frad, dlci); 1070 if (!pvc) { 1071 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n"); 1072 return -ENOBUFS; 1073 } 1074 1075 if (*get_dev_p(pvc, type)) 1076 return -EEXIST; 1077 1078 used = pvc_is_used(pvc); 1079 1080 if (type == ARPHRD_ETHER) 1081 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN, 1082 ether_setup); 1083 else 1084 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup); 1085 1086 if (!dev) { 1087 netdev_warn(frad, "Memory squeeze on fr_pvc()\n"); 1088 delete_unused_pvcs(hdlc); 1089 return -ENOBUFS; 1090 } 1091 1092 if (type == ARPHRD_ETHER) { 1093 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1094 eth_hw_addr_random(dev); 1095 } else { 1096 *(__be16 *)dev->dev_addr = htons(dlci); 1097 dlci_to_q922(dev->broadcast, dlci); 1098 } 1099 dev->netdev_ops = &pvc_ops; 1100 dev->mtu = HDLC_MAX_MTU; 1101 dev->min_mtu = 68; 1102 dev->max_mtu = HDLC_MAX_MTU; 1103 dev->needed_headroom = 10; 1104 dev->priv_flags |= IFF_NO_QUEUE; 1105 dev->ml_priv = pvc; 1106 1107 if (register_netdevice(dev) != 0) { 1108 free_netdev(dev); 1109 delete_unused_pvcs(hdlc); 1110 return -EIO; 1111 } 1112 1113 dev->needs_free_netdev = true; 1114 *get_dev_p(pvc, type) = dev; 1115 if (!used) { 1116 state(hdlc)->dce_changed = 1; 1117 state(hdlc)->dce_pvc_count++; 1118 } 1119 return 0; 1120 } 1121 1122 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type) 1123 { 1124 struct pvc_device *pvc; 1125 struct net_device *dev; 1126 1127 pvc = find_pvc(hdlc, dlci); 1128 if (!pvc) 1129 return -ENOENT; 1130 1131 dev = *get_dev_p(pvc, type); 1132 if (!dev) 1133 return -ENOENT; 1134 1135 if (dev->flags & IFF_UP) 1136 return -EBUSY; /* PVC in use */ 1137 1138 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */ 1139 *get_dev_p(pvc, type) = NULL; 1140 1141 if (!pvc_is_used(pvc)) { 1142 state(hdlc)->dce_pvc_count--; 1143 state(hdlc)->dce_changed = 1; 1144 } 1145 delete_unused_pvcs(hdlc); 1146 return 0; 1147 } 1148 1149 static void fr_destroy(struct net_device *frad) 1150 { 1151 hdlc_device *hdlc = dev_to_hdlc(frad); 1152 struct pvc_device *pvc = state(hdlc)->first_pvc; 1153 1154 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */ 1155 state(hdlc)->dce_pvc_count = 0; 1156 state(hdlc)->dce_changed = 1; 1157 1158 while (pvc) { 1159 struct pvc_device *next = pvc->next; 1160 /* destructors will free_netdev() main and ether */ 1161 if (pvc->main) 1162 unregister_netdevice(pvc->main); 1163 1164 if (pvc->ether) 1165 unregister_netdevice(pvc->ether); 1166 1167 kfree(pvc); 1168 pvc = next; 1169 } 1170 } 1171 1172 static struct hdlc_proto proto = { 1173 .close = fr_close, 1174 .start = fr_start, 1175 .stop = fr_stop, 1176 .detach = fr_destroy, 1177 .ioctl = fr_ioctl, 1178 .netif_rx = fr_rx, 1179 .module = THIS_MODULE, 1180 }; 1181 1182 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr) 1183 { 1184 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr; 1185 const size_t size = sizeof(fr_proto); 1186 fr_proto new_settings; 1187 hdlc_device *hdlc = dev_to_hdlc(dev); 1188 fr_proto_pvc pvc; 1189 int result; 1190 1191 switch (ifr->ifr_settings.type) { 1192 case IF_GET_PROTO: 1193 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1194 return -EINVAL; 1195 ifr->ifr_settings.type = IF_PROTO_FR; 1196 if (ifr->ifr_settings.size < size) { 1197 ifr->ifr_settings.size = size; /* data size wanted */ 1198 return -ENOBUFS; 1199 } 1200 if (copy_to_user(fr_s, &state(hdlc)->settings, size)) 1201 return -EFAULT; 1202 return 0; 1203 1204 case IF_PROTO_FR: 1205 if (!capable(CAP_NET_ADMIN)) 1206 return -EPERM; 1207 1208 if (dev->flags & IFF_UP) 1209 return -EBUSY; 1210 1211 if (copy_from_user(&new_settings, fr_s, size)) 1212 return -EFAULT; 1213 1214 if (new_settings.lmi == LMI_DEFAULT) 1215 new_settings.lmi = LMI_ANSI; 1216 1217 if ((new_settings.lmi != LMI_NONE && 1218 new_settings.lmi != LMI_ANSI && 1219 new_settings.lmi != LMI_CCITT && 1220 new_settings.lmi != LMI_CISCO) || 1221 new_settings.t391 < 1 || 1222 new_settings.t392 < 2 || 1223 new_settings.n391 < 1 || 1224 new_settings.n392 < 1 || 1225 new_settings.n393 < new_settings.n392 || 1226 new_settings.n393 > 32 || 1227 (new_settings.dce != 0 && 1228 new_settings.dce != 1)) 1229 return -EINVAL; 1230 1231 result = hdlc->attach(dev, ENCODING_NRZ, 1232 PARITY_CRC16_PR1_CCITT); 1233 if (result) 1234 return result; 1235 1236 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */ 1237 result = attach_hdlc_protocol(dev, &proto, 1238 sizeof(struct frad_state)); 1239 if (result) 1240 return result; 1241 state(hdlc)->first_pvc = NULL; 1242 state(hdlc)->dce_pvc_count = 0; 1243 } 1244 memcpy(&state(hdlc)->settings, &new_settings, size); 1245 dev->type = ARPHRD_FRAD; 1246 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); 1247 return 0; 1248 1249 case IF_PROTO_FR_ADD_PVC: 1250 case IF_PROTO_FR_DEL_PVC: 1251 case IF_PROTO_FR_ADD_ETH_PVC: 1252 case IF_PROTO_FR_DEL_ETH_PVC: 1253 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1254 return -EINVAL; 1255 1256 if (!capable(CAP_NET_ADMIN)) 1257 return -EPERM; 1258 1259 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc, 1260 sizeof(fr_proto_pvc))) 1261 return -EFAULT; 1262 1263 if (pvc.dlci <= 0 || pvc.dlci >= 1024) 1264 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */ 1265 1266 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC || 1267 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC) 1268 result = ARPHRD_ETHER; /* bridged Ethernet device */ 1269 else 1270 result = ARPHRD_DLCI; 1271 1272 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC || 1273 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC) 1274 return fr_add_pvc(dev, pvc.dlci, result); 1275 else 1276 return fr_del_pvc(hdlc, pvc.dlci, result); 1277 } 1278 1279 return -EINVAL; 1280 } 1281 1282 static int __init mod_init(void) 1283 { 1284 register_hdlc_protocol(&proto); 1285 return 0; 1286 } 1287 1288 static void __exit mod_exit(void) 1289 { 1290 unregister_hdlc_protocol(&proto); 1291 } 1292 1293 module_init(mod_init); 1294 module_exit(mod_exit); 1295 1296 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 1297 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC"); 1298 MODULE_LICENSE("GPL v2"); 1299