1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Generic HDLC support routines for Linux 4 * Frame Relay support 5 * 6 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> 7 * 8 9 Theory of PVC state 10 11 DCE mode: 12 13 (exist,new) -> 0,0 when "PVC create" or if "link unreliable" 14 0,x -> 1,1 if "link reliable" when sending FULL STATUS 15 1,1 -> 1,0 if received FULL STATUS ACK 16 17 (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create" 18 -> 1 when "PVC up" and (exist,new) = 1,0 19 20 DTE mode: 21 (exist,new,active) = FULL STATUS if "link reliable" 22 = 0, 0, 0 if "link unreliable" 23 No LMI: 24 active = open and "link reliable" 25 exist = new = not used 26 27 CCITT LMI: ITU-T Q.933 Annex A 28 ANSI LMI: ANSI T1.617 Annex D 29 CISCO LMI: the original, aka "Gang of Four" LMI 30 31 */ 32 33 #include <linux/errno.h> 34 #include <linux/etherdevice.h> 35 #include <linux/hdlc.h> 36 #include <linux/if_arp.h> 37 #include <linux/inetdevice.h> 38 #include <linux/init.h> 39 #include <linux/kernel.h> 40 #include <linux/module.h> 41 #include <linux/pkt_sched.h> 42 #include <linux/poll.h> 43 #include <linux/rtnetlink.h> 44 #include <linux/skbuff.h> 45 #include <linux/slab.h> 46 47 #undef DEBUG_PKT 48 #undef DEBUG_ECN 49 #undef DEBUG_LINK 50 #undef DEBUG_PROTO 51 #undef DEBUG_PVC 52 53 #define FR_UI 0x03 54 #define FR_PAD 0x00 55 56 #define NLPID_IP 0xCC 57 #define NLPID_IPV6 0x8E 58 #define NLPID_SNAP 0x80 59 #define NLPID_PAD 0x00 60 #define NLPID_CCITT_ANSI_LMI 0x08 61 #define NLPID_CISCO_LMI 0x09 62 63 64 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */ 65 #define LMI_CISCO_DLCI 1023 66 67 #define LMI_CALLREF 0x00 /* Call Reference */ 68 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */ 69 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */ 70 #define LMI_CCITT_REPTYPE 0x51 71 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */ 72 #define LMI_CCITT_ALIVE 0x53 73 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */ 74 #define LMI_CCITT_PVCSTAT 0x57 75 76 #define LMI_FULLREP 0x00 /* full report */ 77 #define LMI_INTEGRITY 0x01 /* link integrity report */ 78 #define LMI_SINGLE 0x02 /* single PVC report */ 79 80 #define LMI_STATUS_ENQUIRY 0x75 81 #define LMI_STATUS 0x7D /* reply */ 82 83 #define LMI_REPT_LEN 1 /* report type element length */ 84 #define LMI_INTEG_LEN 2 /* link integrity element length */ 85 86 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */ 87 #define LMI_ANSI_LENGTH 14 88 89 90 struct fr_hdr { 91 #if defined(__LITTLE_ENDIAN_BITFIELD) 92 unsigned ea1: 1; 93 unsigned cr: 1; 94 unsigned dlcih: 6; 95 96 unsigned ea2: 1; 97 unsigned de: 1; 98 unsigned becn: 1; 99 unsigned fecn: 1; 100 unsigned dlcil: 4; 101 #else 102 unsigned dlcih: 6; 103 unsigned cr: 1; 104 unsigned ea1: 1; 105 106 unsigned dlcil: 4; 107 unsigned fecn: 1; 108 unsigned becn: 1; 109 unsigned de: 1; 110 unsigned ea2: 1; 111 #endif 112 } __packed; 113 114 115 struct pvc_device { 116 struct net_device *frad; 117 struct net_device *main; 118 struct net_device *ether; /* bridged Ethernet interface */ 119 struct pvc_device *next; /* Sorted in ascending DLCI order */ 120 int dlci; 121 int open_count; 122 123 struct { 124 unsigned int new: 1; 125 unsigned int active: 1; 126 unsigned int exist: 1; 127 unsigned int deleted: 1; 128 unsigned int fecn: 1; 129 unsigned int becn: 1; 130 unsigned int bandwidth; /* Cisco LMI reporting only */ 131 }state; 132 }; 133 134 struct frad_state { 135 fr_proto settings; 136 struct pvc_device *first_pvc; 137 int dce_pvc_count; 138 139 struct timer_list timer; 140 struct net_device *dev; 141 unsigned long last_poll; 142 int reliable; 143 int dce_changed; 144 int request; 145 int fullrep_sent; 146 u32 last_errors; /* last errors bit list */ 147 u8 n391cnt; 148 u8 txseq; /* TX sequence number */ 149 u8 rxseq; /* RX sequence number */ 150 }; 151 152 153 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr); 154 155 156 static inline u16 q922_to_dlci(u8 *hdr) 157 { 158 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4); 159 } 160 161 162 static inline void dlci_to_q922(u8 *hdr, u16 dlci) 163 { 164 hdr[0] = (dlci >> 2) & 0xFC; 165 hdr[1] = ((dlci << 4) & 0xF0) | 0x01; 166 } 167 168 169 static inline struct frad_state* state(hdlc_device *hdlc) 170 { 171 return(struct frad_state *)(hdlc->state); 172 } 173 174 175 static inline struct pvc_device *find_pvc(hdlc_device *hdlc, u16 dlci) 176 { 177 struct pvc_device *pvc = state(hdlc)->first_pvc; 178 179 while (pvc) { 180 if (pvc->dlci == dlci) 181 return pvc; 182 if (pvc->dlci > dlci) 183 return NULL; /* the list is sorted */ 184 pvc = pvc->next; 185 } 186 187 return NULL; 188 } 189 190 191 static struct pvc_device *add_pvc(struct net_device *dev, u16 dlci) 192 { 193 hdlc_device *hdlc = dev_to_hdlc(dev); 194 struct pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc; 195 196 while (*pvc_p) { 197 if ((*pvc_p)->dlci == dlci) 198 return *pvc_p; 199 if ((*pvc_p)->dlci > dlci) 200 break; /* the list is sorted */ 201 pvc_p = &(*pvc_p)->next; 202 } 203 204 pvc = kzalloc(sizeof(*pvc), GFP_ATOMIC); 205 #ifdef DEBUG_PVC 206 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev); 207 #endif 208 if (!pvc) 209 return NULL; 210 211 pvc->dlci = dlci; 212 pvc->frad = dev; 213 pvc->next = *pvc_p; /* Put it in the chain */ 214 *pvc_p = pvc; 215 return pvc; 216 } 217 218 219 static inline int pvc_is_used(struct pvc_device *pvc) 220 { 221 return pvc->main || pvc->ether; 222 } 223 224 225 static inline void pvc_carrier(int on, struct pvc_device *pvc) 226 { 227 if (on) { 228 if (pvc->main) 229 if (!netif_carrier_ok(pvc->main)) 230 netif_carrier_on(pvc->main); 231 if (pvc->ether) 232 if (!netif_carrier_ok(pvc->ether)) 233 netif_carrier_on(pvc->ether); 234 } else { 235 if (pvc->main) 236 if (netif_carrier_ok(pvc->main)) 237 netif_carrier_off(pvc->main); 238 if (pvc->ether) 239 if (netif_carrier_ok(pvc->ether)) 240 netif_carrier_off(pvc->ether); 241 } 242 } 243 244 245 static inline void delete_unused_pvcs(hdlc_device *hdlc) 246 { 247 struct pvc_device **pvc_p = &state(hdlc)->first_pvc; 248 249 while (*pvc_p) { 250 if (!pvc_is_used(*pvc_p)) { 251 struct pvc_device *pvc = *pvc_p; 252 #ifdef DEBUG_PVC 253 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc); 254 #endif 255 *pvc_p = pvc->next; 256 kfree(pvc); 257 continue; 258 } 259 pvc_p = &(*pvc_p)->next; 260 } 261 } 262 263 264 static inline struct net_device **get_dev_p(struct pvc_device *pvc, 265 int type) 266 { 267 if (type == ARPHRD_ETHER) 268 return &pvc->ether; 269 else 270 return &pvc->main; 271 } 272 273 274 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci) 275 { 276 u16 head_len; 277 struct sk_buff *skb = *skb_p; 278 279 switch (skb->protocol) { 280 case cpu_to_be16(NLPID_CCITT_ANSI_LMI): 281 head_len = 4; 282 skb_push(skb, head_len); 283 skb->data[3] = NLPID_CCITT_ANSI_LMI; 284 break; 285 286 case cpu_to_be16(NLPID_CISCO_LMI): 287 head_len = 4; 288 skb_push(skb, head_len); 289 skb->data[3] = NLPID_CISCO_LMI; 290 break; 291 292 case cpu_to_be16(ETH_P_IP): 293 head_len = 4; 294 skb_push(skb, head_len); 295 skb->data[3] = NLPID_IP; 296 break; 297 298 case cpu_to_be16(ETH_P_IPV6): 299 head_len = 4; 300 skb_push(skb, head_len); 301 skb->data[3] = NLPID_IPV6; 302 break; 303 304 case cpu_to_be16(ETH_P_802_3): 305 head_len = 10; 306 if (skb_headroom(skb) < head_len) { 307 struct sk_buff *skb2 = skb_realloc_headroom(skb, 308 head_len); 309 if (!skb2) 310 return -ENOBUFS; 311 dev_kfree_skb(skb); 312 skb = *skb_p = skb2; 313 } 314 skb_push(skb, head_len); 315 skb->data[3] = FR_PAD; 316 skb->data[4] = NLPID_SNAP; 317 skb->data[5] = FR_PAD; 318 skb->data[6] = 0x80; 319 skb->data[7] = 0xC2; 320 skb->data[8] = 0x00; 321 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */ 322 break; 323 324 default: 325 head_len = 10; 326 skb_push(skb, head_len); 327 skb->data[3] = FR_PAD; 328 skb->data[4] = NLPID_SNAP; 329 skb->data[5] = FR_PAD; 330 skb->data[6] = FR_PAD; 331 skb->data[7] = FR_PAD; 332 *(__be16*)(skb->data + 8) = skb->protocol; 333 } 334 335 dlci_to_q922(skb->data, dlci); 336 skb->data[2] = FR_UI; 337 return 0; 338 } 339 340 341 342 static int pvc_open(struct net_device *dev) 343 { 344 struct pvc_device *pvc = dev->ml_priv; 345 346 if ((pvc->frad->flags & IFF_UP) == 0) 347 return -EIO; /* Frad must be UP in order to activate PVC */ 348 349 if (pvc->open_count++ == 0) { 350 hdlc_device *hdlc = dev_to_hdlc(pvc->frad); 351 if (state(hdlc)->settings.lmi == LMI_NONE) 352 pvc->state.active = netif_carrier_ok(pvc->frad); 353 354 pvc_carrier(pvc->state.active, pvc); 355 state(hdlc)->dce_changed = 1; 356 } 357 return 0; 358 } 359 360 361 362 static int pvc_close(struct net_device *dev) 363 { 364 struct pvc_device *pvc = dev->ml_priv; 365 366 if (--pvc->open_count == 0) { 367 hdlc_device *hdlc = dev_to_hdlc(pvc->frad); 368 if (state(hdlc)->settings.lmi == LMI_NONE) 369 pvc->state.active = 0; 370 371 if (state(hdlc)->settings.dce) { 372 state(hdlc)->dce_changed = 1; 373 pvc->state.active = 0; 374 } 375 } 376 return 0; 377 } 378 379 380 381 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 382 { 383 struct pvc_device *pvc = dev->ml_priv; 384 fr_proto_pvc_info info; 385 386 if (ifr->ifr_settings.type == IF_GET_PROTO) { 387 if (dev->type == ARPHRD_ETHER) 388 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC; 389 else 390 ifr->ifr_settings.type = IF_PROTO_FR_PVC; 391 392 if (ifr->ifr_settings.size < sizeof(info)) { 393 /* data size wanted */ 394 ifr->ifr_settings.size = sizeof(info); 395 return -ENOBUFS; 396 } 397 398 info.dlci = pvc->dlci; 399 memcpy(info.master, pvc->frad->name, IFNAMSIZ); 400 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info, 401 &info, sizeof(info))) 402 return -EFAULT; 403 return 0; 404 } 405 406 return -EINVAL; 407 } 408 409 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev) 410 { 411 struct pvc_device *pvc = dev->ml_priv; 412 413 if (pvc->state.active) { 414 if (dev->type == ARPHRD_ETHER) { 415 int pad = ETH_ZLEN - skb->len; 416 if (pad > 0) { /* Pad the frame with zeros */ 417 int len = skb->len; 418 if (skb_tailroom(skb) < pad) 419 if (pskb_expand_head(skb, 0, pad, 420 GFP_ATOMIC)) { 421 dev->stats.tx_dropped++; 422 dev_kfree_skb(skb); 423 return NETDEV_TX_OK; 424 } 425 skb_put(skb, pad); 426 memset(skb->data + len, 0, pad); 427 } 428 skb->protocol = cpu_to_be16(ETH_P_802_3); 429 } 430 if (!fr_hard_header(&skb, pvc->dlci)) { 431 dev->stats.tx_bytes += skb->len; 432 dev->stats.tx_packets++; 433 if (pvc->state.fecn) /* TX Congestion counter */ 434 dev->stats.tx_compressed++; 435 skb->dev = pvc->frad; 436 skb->protocol = htons(ETH_P_HDLC); 437 skb_reset_network_header(skb); 438 dev_queue_xmit(skb); 439 return NETDEV_TX_OK; 440 } 441 } 442 443 dev->stats.tx_dropped++; 444 dev_kfree_skb(skb); 445 return NETDEV_TX_OK; 446 } 447 448 static inline void fr_log_dlci_active(struct pvc_device *pvc) 449 { 450 netdev_info(pvc->frad, "DLCI %d [%s%s%s]%s %s\n", 451 pvc->dlci, 452 pvc->main ? pvc->main->name : "", 453 pvc->main && pvc->ether ? " " : "", 454 pvc->ether ? pvc->ether->name : "", 455 pvc->state.new ? " new" : "", 456 !pvc->state.exist ? "deleted" : 457 pvc->state.active ? "active" : "inactive"); 458 } 459 460 461 462 static inline u8 fr_lmi_nextseq(u8 x) 463 { 464 x++; 465 return x ? x : 1; 466 } 467 468 469 static void fr_lmi_send(struct net_device *dev, int fullrep) 470 { 471 hdlc_device *hdlc = dev_to_hdlc(dev); 472 struct sk_buff *skb; 473 struct pvc_device *pvc = state(hdlc)->first_pvc; 474 int lmi = state(hdlc)->settings.lmi; 475 int dce = state(hdlc)->settings.dce; 476 int len = lmi == LMI_ANSI ? LMI_ANSI_LENGTH : LMI_CCITT_CISCO_LENGTH; 477 int stat_len = (lmi == LMI_CISCO) ? 6 : 3; 478 u8 *data; 479 int i = 0; 480 481 if (dce && fullrep) { 482 len += state(hdlc)->dce_pvc_count * (2 + stat_len); 483 if (len > HDLC_MAX_MRU) { 484 netdev_warn(dev, "Too many PVCs while sending LMI full report\n"); 485 return; 486 } 487 } 488 489 skb = dev_alloc_skb(len); 490 if (!skb) { 491 netdev_warn(dev, "Memory squeeze on fr_lmi_send()\n"); 492 return; 493 } 494 memset(skb->data, 0, len); 495 skb_reserve(skb, 4); 496 if (lmi == LMI_CISCO) { 497 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI); 498 fr_hard_header(&skb, LMI_CISCO_DLCI); 499 } else { 500 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI); 501 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI); 502 } 503 data = skb_tail_pointer(skb); 504 data[i++] = LMI_CALLREF; 505 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY; 506 if (lmi == LMI_ANSI) 507 data[i++] = LMI_ANSI_LOCKSHIFT; 508 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : 509 LMI_ANSI_CISCO_REPTYPE; 510 data[i++] = LMI_REPT_LEN; 511 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY; 512 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE; 513 data[i++] = LMI_INTEG_LEN; 514 data[i++] = state(hdlc)->txseq = 515 fr_lmi_nextseq(state(hdlc)->txseq); 516 data[i++] = state(hdlc)->rxseq; 517 518 if (dce && fullrep) { 519 while (pvc) { 520 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : 521 LMI_ANSI_CISCO_PVCSTAT; 522 data[i++] = stat_len; 523 524 /* LMI start/restart */ 525 if (state(hdlc)->reliable && !pvc->state.exist) { 526 pvc->state.exist = pvc->state.new = 1; 527 fr_log_dlci_active(pvc); 528 } 529 530 /* ifconfig PVC up */ 531 if (pvc->open_count && !pvc->state.active && 532 pvc->state.exist && !pvc->state.new) { 533 pvc_carrier(1, pvc); 534 pvc->state.active = 1; 535 fr_log_dlci_active(pvc); 536 } 537 538 if (lmi == LMI_CISCO) { 539 data[i] = pvc->dlci >> 8; 540 data[i + 1] = pvc->dlci & 0xFF; 541 } else { 542 data[i] = (pvc->dlci >> 4) & 0x3F; 543 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80; 544 data[i + 2] = 0x80; 545 } 546 547 if (pvc->state.new) 548 data[i + 2] |= 0x08; 549 else if (pvc->state.active) 550 data[i + 2] |= 0x02; 551 552 i += stat_len; 553 pvc = pvc->next; 554 } 555 } 556 557 skb_put(skb, i); 558 skb->priority = TC_PRIO_CONTROL; 559 skb->dev = dev; 560 skb->protocol = htons(ETH_P_HDLC); 561 skb_reset_network_header(skb); 562 563 dev_queue_xmit(skb); 564 } 565 566 567 568 static void fr_set_link_state(int reliable, struct net_device *dev) 569 { 570 hdlc_device *hdlc = dev_to_hdlc(dev); 571 struct pvc_device *pvc = state(hdlc)->first_pvc; 572 573 state(hdlc)->reliable = reliable; 574 if (reliable) { 575 netif_dormant_off(dev); 576 state(hdlc)->n391cnt = 0; /* Request full status */ 577 state(hdlc)->dce_changed = 1; 578 579 if (state(hdlc)->settings.lmi == LMI_NONE) { 580 while (pvc) { /* Activate all PVCs */ 581 pvc_carrier(1, pvc); 582 pvc->state.exist = pvc->state.active = 1; 583 pvc->state.new = 0; 584 pvc = pvc->next; 585 } 586 } 587 } else { 588 netif_dormant_on(dev); 589 while (pvc) { /* Deactivate all PVCs */ 590 pvc_carrier(0, pvc); 591 pvc->state.exist = pvc->state.active = 0; 592 pvc->state.new = 0; 593 if (!state(hdlc)->settings.dce) 594 pvc->state.bandwidth = 0; 595 pvc = pvc->next; 596 } 597 } 598 } 599 600 601 static void fr_timer(struct timer_list *t) 602 { 603 struct frad_state *st = from_timer(st, t, timer); 604 struct net_device *dev = st->dev; 605 hdlc_device *hdlc = dev_to_hdlc(dev); 606 int i, cnt = 0, reliable; 607 u32 list; 608 609 if (state(hdlc)->settings.dce) { 610 reliable = state(hdlc)->request && 611 time_before(jiffies, state(hdlc)->last_poll + 612 state(hdlc)->settings.t392 * HZ); 613 state(hdlc)->request = 0; 614 } else { 615 state(hdlc)->last_errors <<= 1; /* Shift the list */ 616 if (state(hdlc)->request) { 617 if (state(hdlc)->reliable) 618 netdev_info(dev, "No LMI status reply received\n"); 619 state(hdlc)->last_errors |= 1; 620 } 621 622 list = state(hdlc)->last_errors; 623 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1) 624 cnt += (list & 1); /* errors count */ 625 626 reliable = (cnt < state(hdlc)->settings.n392); 627 } 628 629 if (state(hdlc)->reliable != reliable) { 630 netdev_info(dev, "Link %sreliable\n", reliable ? "" : "un"); 631 fr_set_link_state(reliable, dev); 632 } 633 634 if (state(hdlc)->settings.dce) 635 state(hdlc)->timer.expires = jiffies + 636 state(hdlc)->settings.t392 * HZ; 637 else { 638 if (state(hdlc)->n391cnt) 639 state(hdlc)->n391cnt--; 640 641 fr_lmi_send(dev, state(hdlc)->n391cnt == 0); 642 643 state(hdlc)->last_poll = jiffies; 644 state(hdlc)->request = 1; 645 state(hdlc)->timer.expires = jiffies + 646 state(hdlc)->settings.t391 * HZ; 647 } 648 649 add_timer(&state(hdlc)->timer); 650 } 651 652 653 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb) 654 { 655 hdlc_device *hdlc = dev_to_hdlc(dev); 656 struct pvc_device *pvc; 657 u8 rxseq, txseq; 658 int lmi = state(hdlc)->settings.lmi; 659 int dce = state(hdlc)->settings.dce; 660 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i; 661 662 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH : 663 LMI_CCITT_CISCO_LENGTH)) { 664 netdev_info(dev, "Short LMI frame\n"); 665 return 1; 666 } 667 668 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI : 669 NLPID_CCITT_ANSI_LMI)) { 670 netdev_info(dev, "Received non-LMI frame with LMI DLCI\n"); 671 return 1; 672 } 673 674 if (skb->data[4] != LMI_CALLREF) { 675 netdev_info(dev, "Invalid LMI Call reference (0x%02X)\n", 676 skb->data[4]); 677 return 1; 678 } 679 680 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) { 681 netdev_info(dev, "Invalid LMI Message type (0x%02X)\n", 682 skb->data[5]); 683 return 1; 684 } 685 686 if (lmi == LMI_ANSI) { 687 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) { 688 netdev_info(dev, "Not ANSI locking shift in LMI message (0x%02X)\n", 689 skb->data[6]); 690 return 1; 691 } 692 i = 7; 693 } else 694 i = 6; 695 696 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : 697 LMI_ANSI_CISCO_REPTYPE)) { 698 netdev_info(dev, "Not an LMI Report type IE (0x%02X)\n", 699 skb->data[i]); 700 return 1; 701 } 702 703 if (skb->data[++i] != LMI_REPT_LEN) { 704 netdev_info(dev, "Invalid LMI Report type IE length (%u)\n", 705 skb->data[i]); 706 return 1; 707 } 708 709 reptype = skb->data[++i]; 710 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) { 711 netdev_info(dev, "Unsupported LMI Report type (0x%02X)\n", 712 reptype); 713 return 1; 714 } 715 716 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE : 717 LMI_ANSI_CISCO_ALIVE)) { 718 netdev_info(dev, "Not an LMI Link integrity verification IE (0x%02X)\n", 719 skb->data[i]); 720 return 1; 721 } 722 723 if (skb->data[++i] != LMI_INTEG_LEN) { 724 netdev_info(dev, "Invalid LMI Link integrity verification IE length (%u)\n", 725 skb->data[i]); 726 return 1; 727 } 728 i++; 729 730 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */ 731 rxseq = skb->data[i++]; /* Should confirm our sequence */ 732 733 txseq = state(hdlc)->txseq; 734 735 if (dce) 736 state(hdlc)->last_poll = jiffies; 737 738 error = 0; 739 if (!state(hdlc)->reliable) 740 error = 1; 741 742 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */ 743 state(hdlc)->n391cnt = 0; 744 error = 1; 745 } 746 747 if (dce) { 748 if (state(hdlc)->fullrep_sent && !error) { 749 /* Stop sending full report - the last one has been confirmed by DTE */ 750 state(hdlc)->fullrep_sent = 0; 751 pvc = state(hdlc)->first_pvc; 752 while (pvc) { 753 if (pvc->state.new) { 754 pvc->state.new = 0; 755 756 /* Tell DTE that new PVC is now active */ 757 state(hdlc)->dce_changed = 1; 758 } 759 pvc = pvc->next; 760 } 761 } 762 763 if (state(hdlc)->dce_changed) { 764 reptype = LMI_FULLREP; 765 state(hdlc)->fullrep_sent = 1; 766 state(hdlc)->dce_changed = 0; 767 } 768 769 state(hdlc)->request = 1; /* got request */ 770 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0); 771 return 0; 772 } 773 774 /* DTE */ 775 776 state(hdlc)->request = 0; /* got response, no request pending */ 777 778 if (error) 779 return 0; 780 781 if (reptype != LMI_FULLREP) 782 return 0; 783 784 pvc = state(hdlc)->first_pvc; 785 786 while (pvc) { 787 pvc->state.deleted = 1; 788 pvc = pvc->next; 789 } 790 791 no_ram = 0; 792 while (skb->len >= i + 2 + stat_len) { 793 u16 dlci; 794 u32 bw; 795 unsigned int active, new; 796 797 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : 798 LMI_ANSI_CISCO_PVCSTAT)) { 799 netdev_info(dev, "Not an LMI PVC status IE (0x%02X)\n", 800 skb->data[i]); 801 return 1; 802 } 803 804 if (skb->data[++i] != stat_len) { 805 netdev_info(dev, "Invalid LMI PVC status IE length (%u)\n", 806 skb->data[i]); 807 return 1; 808 } 809 i++; 810 811 new = !! (skb->data[i + 2] & 0x08); 812 active = !! (skb->data[i + 2] & 0x02); 813 if (lmi == LMI_CISCO) { 814 dlci = (skb->data[i] << 8) | skb->data[i + 1]; 815 bw = (skb->data[i + 3] << 16) | 816 (skb->data[i + 4] << 8) | 817 (skb->data[i + 5]); 818 } else { 819 dlci = ((skb->data[i] & 0x3F) << 4) | 820 ((skb->data[i + 1] & 0x78) >> 3); 821 bw = 0; 822 } 823 824 pvc = add_pvc(dev, dlci); 825 826 if (!pvc && !no_ram) { 827 netdev_warn(dev, "Memory squeeze on fr_lmi_recv()\n"); 828 no_ram = 1; 829 } 830 831 if (pvc) { 832 pvc->state.exist = 1; 833 pvc->state.deleted = 0; 834 if (active != pvc->state.active || 835 new != pvc->state.new || 836 bw != pvc->state.bandwidth || 837 !pvc->state.exist) { 838 pvc->state.new = new; 839 pvc->state.active = active; 840 pvc->state.bandwidth = bw; 841 pvc_carrier(active, pvc); 842 fr_log_dlci_active(pvc); 843 } 844 } 845 846 i += stat_len; 847 } 848 849 pvc = state(hdlc)->first_pvc; 850 851 while (pvc) { 852 if (pvc->state.deleted && pvc->state.exist) { 853 pvc_carrier(0, pvc); 854 pvc->state.active = pvc->state.new = 0; 855 pvc->state.exist = 0; 856 pvc->state.bandwidth = 0; 857 fr_log_dlci_active(pvc); 858 } 859 pvc = pvc->next; 860 } 861 862 /* Next full report after N391 polls */ 863 state(hdlc)->n391cnt = state(hdlc)->settings.n391; 864 865 return 0; 866 } 867 868 869 static int fr_rx(struct sk_buff *skb) 870 { 871 struct net_device *frad = skb->dev; 872 hdlc_device *hdlc = dev_to_hdlc(frad); 873 struct fr_hdr *fh = (struct fr_hdr *)skb->data; 874 u8 *data = skb->data; 875 u16 dlci; 876 struct pvc_device *pvc; 877 struct net_device *dev = NULL; 878 879 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI) 880 goto rx_error; 881 882 dlci = q922_to_dlci(skb->data); 883 884 if ((dlci == LMI_CCITT_ANSI_DLCI && 885 (state(hdlc)->settings.lmi == LMI_ANSI || 886 state(hdlc)->settings.lmi == LMI_CCITT)) || 887 (dlci == LMI_CISCO_DLCI && 888 state(hdlc)->settings.lmi == LMI_CISCO)) { 889 if (fr_lmi_recv(frad, skb)) 890 goto rx_error; 891 dev_kfree_skb_any(skb); 892 return NET_RX_SUCCESS; 893 } 894 895 pvc = find_pvc(hdlc, dlci); 896 if (!pvc) { 897 #ifdef DEBUG_PKT 898 netdev_info(frad, "No PVC for received frame's DLCI %d\n", 899 dlci); 900 #endif 901 dev_kfree_skb_any(skb); 902 return NET_RX_DROP; 903 } 904 905 if (pvc->state.fecn != fh->fecn) { 906 #ifdef DEBUG_ECN 907 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name, 908 dlci, fh->fecn ? "N" : "FF"); 909 #endif 910 pvc->state.fecn ^= 1; 911 } 912 913 if (pvc->state.becn != fh->becn) { 914 #ifdef DEBUG_ECN 915 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name, 916 dlci, fh->becn ? "N" : "FF"); 917 #endif 918 pvc->state.becn ^= 1; 919 } 920 921 922 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { 923 frad->stats.rx_dropped++; 924 return NET_RX_DROP; 925 } 926 927 if (data[3] == NLPID_IP) { 928 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 929 dev = pvc->main; 930 skb->protocol = htons(ETH_P_IP); 931 932 } else if (data[3] == NLPID_IPV6) { 933 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 934 dev = pvc->main; 935 skb->protocol = htons(ETH_P_IPV6); 936 937 } else if (skb->len > 10 && data[3] == FR_PAD && 938 data[4] == NLPID_SNAP && data[5] == FR_PAD) { 939 u16 oui = ntohs(*(__be16*)(data + 6)); 940 u16 pid = ntohs(*(__be16*)(data + 8)); 941 skb_pull(skb, 10); 942 943 switch ((((u32)oui) << 16) | pid) { 944 case ETH_P_ARP: /* routed frame with SNAP */ 945 case ETH_P_IPX: 946 case ETH_P_IP: /* a long variant */ 947 case ETH_P_IPV6: 948 dev = pvc->main; 949 skb->protocol = htons(pid); 950 break; 951 952 case 0x80C20007: /* bridged Ethernet frame */ 953 if ((dev = pvc->ether) != NULL) 954 skb->protocol = eth_type_trans(skb, dev); 955 break; 956 957 default: 958 netdev_info(frad, "Unsupported protocol, OUI=%x PID=%x\n", 959 oui, pid); 960 dev_kfree_skb_any(skb); 961 return NET_RX_DROP; 962 } 963 } else { 964 netdev_info(frad, "Unsupported protocol, NLPID=%x length=%i\n", 965 data[3], skb->len); 966 dev_kfree_skb_any(skb); 967 return NET_RX_DROP; 968 } 969 970 if (dev) { 971 dev->stats.rx_packets++; /* PVC traffic */ 972 dev->stats.rx_bytes += skb->len; 973 if (pvc->state.becn) 974 dev->stats.rx_compressed++; 975 skb->dev = dev; 976 netif_rx(skb); 977 return NET_RX_SUCCESS; 978 } else { 979 dev_kfree_skb_any(skb); 980 return NET_RX_DROP; 981 } 982 983 rx_error: 984 frad->stats.rx_errors++; /* Mark error */ 985 dev_kfree_skb_any(skb); 986 return NET_RX_DROP; 987 } 988 989 990 991 static void fr_start(struct net_device *dev) 992 { 993 hdlc_device *hdlc = dev_to_hdlc(dev); 994 #ifdef DEBUG_LINK 995 printk(KERN_DEBUG "fr_start\n"); 996 #endif 997 if (state(hdlc)->settings.lmi != LMI_NONE) { 998 state(hdlc)->reliable = 0; 999 state(hdlc)->dce_changed = 1; 1000 state(hdlc)->request = 0; 1001 state(hdlc)->fullrep_sent = 0; 1002 state(hdlc)->last_errors = 0xFFFFFFFF; 1003 state(hdlc)->n391cnt = 0; 1004 state(hdlc)->txseq = state(hdlc)->rxseq = 0; 1005 1006 state(hdlc)->dev = dev; 1007 timer_setup(&state(hdlc)->timer, fr_timer, 0); 1008 /* First poll after 1 s */ 1009 state(hdlc)->timer.expires = jiffies + HZ; 1010 add_timer(&state(hdlc)->timer); 1011 } else 1012 fr_set_link_state(1, dev); 1013 } 1014 1015 1016 static void fr_stop(struct net_device *dev) 1017 { 1018 hdlc_device *hdlc = dev_to_hdlc(dev); 1019 #ifdef DEBUG_LINK 1020 printk(KERN_DEBUG "fr_stop\n"); 1021 #endif 1022 if (state(hdlc)->settings.lmi != LMI_NONE) 1023 del_timer_sync(&state(hdlc)->timer); 1024 fr_set_link_state(0, dev); 1025 } 1026 1027 1028 static void fr_close(struct net_device *dev) 1029 { 1030 hdlc_device *hdlc = dev_to_hdlc(dev); 1031 struct pvc_device *pvc = state(hdlc)->first_pvc; 1032 1033 while (pvc) { /* Shutdown all PVCs for this FRAD */ 1034 if (pvc->main) 1035 dev_close(pvc->main); 1036 if (pvc->ether) 1037 dev_close(pvc->ether); 1038 pvc = pvc->next; 1039 } 1040 } 1041 1042 1043 static void pvc_setup(struct net_device *dev) 1044 { 1045 dev->type = ARPHRD_DLCI; 1046 dev->flags = IFF_POINTOPOINT; 1047 dev->hard_header_len = 0; 1048 dev->addr_len = 2; 1049 netif_keep_dst(dev); 1050 } 1051 1052 static const struct net_device_ops pvc_ops = { 1053 .ndo_open = pvc_open, 1054 .ndo_stop = pvc_close, 1055 .ndo_start_xmit = pvc_xmit, 1056 .ndo_do_ioctl = pvc_ioctl, 1057 }; 1058 1059 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type) 1060 { 1061 hdlc_device *hdlc = dev_to_hdlc(frad); 1062 struct pvc_device *pvc; 1063 struct net_device *dev; 1064 int used; 1065 1066 if ((pvc = add_pvc(frad, dlci)) == NULL) { 1067 netdev_warn(frad, "Memory squeeze on fr_add_pvc()\n"); 1068 return -ENOBUFS; 1069 } 1070 1071 if (*get_dev_p(pvc, type)) 1072 return -EEXIST; 1073 1074 used = pvc_is_used(pvc); 1075 1076 if (type == ARPHRD_ETHER) 1077 dev = alloc_netdev(0, "pvceth%d", NET_NAME_UNKNOWN, 1078 ether_setup); 1079 else 1080 dev = alloc_netdev(0, "pvc%d", NET_NAME_UNKNOWN, pvc_setup); 1081 1082 if (!dev) { 1083 netdev_warn(frad, "Memory squeeze on fr_pvc()\n"); 1084 delete_unused_pvcs(hdlc); 1085 return -ENOBUFS; 1086 } 1087 1088 if (type == ARPHRD_ETHER) { 1089 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 1090 eth_hw_addr_random(dev); 1091 } else { 1092 *(__be16*)dev->dev_addr = htons(dlci); 1093 dlci_to_q922(dev->broadcast, dlci); 1094 } 1095 dev->netdev_ops = &pvc_ops; 1096 dev->mtu = HDLC_MAX_MTU; 1097 dev->min_mtu = 68; 1098 dev->max_mtu = HDLC_MAX_MTU; 1099 dev->needed_headroom = 10; 1100 dev->priv_flags |= IFF_NO_QUEUE; 1101 dev->ml_priv = pvc; 1102 1103 if (register_netdevice(dev) != 0) { 1104 free_netdev(dev); 1105 delete_unused_pvcs(hdlc); 1106 return -EIO; 1107 } 1108 1109 dev->needs_free_netdev = true; 1110 *get_dev_p(pvc, type) = dev; 1111 if (!used) { 1112 state(hdlc)->dce_changed = 1; 1113 state(hdlc)->dce_pvc_count++; 1114 } 1115 return 0; 1116 } 1117 1118 1119 1120 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type) 1121 { 1122 struct pvc_device *pvc; 1123 struct net_device *dev; 1124 1125 if ((pvc = find_pvc(hdlc, dlci)) == NULL) 1126 return -ENOENT; 1127 1128 if ((dev = *get_dev_p(pvc, type)) == NULL) 1129 return -ENOENT; 1130 1131 if (dev->flags & IFF_UP) 1132 return -EBUSY; /* PVC in use */ 1133 1134 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */ 1135 *get_dev_p(pvc, type) = NULL; 1136 1137 if (!pvc_is_used(pvc)) { 1138 state(hdlc)->dce_pvc_count--; 1139 state(hdlc)->dce_changed = 1; 1140 } 1141 delete_unused_pvcs(hdlc); 1142 return 0; 1143 } 1144 1145 1146 1147 static void fr_destroy(struct net_device *frad) 1148 { 1149 hdlc_device *hdlc = dev_to_hdlc(frad); 1150 struct pvc_device *pvc = state(hdlc)->first_pvc; 1151 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */ 1152 state(hdlc)->dce_pvc_count = 0; 1153 state(hdlc)->dce_changed = 1; 1154 1155 while (pvc) { 1156 struct pvc_device *next = pvc->next; 1157 /* destructors will free_netdev() main and ether */ 1158 if (pvc->main) 1159 unregister_netdevice(pvc->main); 1160 1161 if (pvc->ether) 1162 unregister_netdevice(pvc->ether); 1163 1164 kfree(pvc); 1165 pvc = next; 1166 } 1167 } 1168 1169 1170 static struct hdlc_proto proto = { 1171 .close = fr_close, 1172 .start = fr_start, 1173 .stop = fr_stop, 1174 .detach = fr_destroy, 1175 .ioctl = fr_ioctl, 1176 .netif_rx = fr_rx, 1177 .module = THIS_MODULE, 1178 }; 1179 1180 1181 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr) 1182 { 1183 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr; 1184 const size_t size = sizeof(fr_proto); 1185 fr_proto new_settings; 1186 hdlc_device *hdlc = dev_to_hdlc(dev); 1187 fr_proto_pvc pvc; 1188 int result; 1189 1190 switch (ifr->ifr_settings.type) { 1191 case IF_GET_PROTO: 1192 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1193 return -EINVAL; 1194 ifr->ifr_settings.type = IF_PROTO_FR; 1195 if (ifr->ifr_settings.size < size) { 1196 ifr->ifr_settings.size = size; /* data size wanted */ 1197 return -ENOBUFS; 1198 } 1199 if (copy_to_user(fr_s, &state(hdlc)->settings, size)) 1200 return -EFAULT; 1201 return 0; 1202 1203 case IF_PROTO_FR: 1204 if (!capable(CAP_NET_ADMIN)) 1205 return -EPERM; 1206 1207 if (dev->flags & IFF_UP) 1208 return -EBUSY; 1209 1210 if (copy_from_user(&new_settings, fr_s, size)) 1211 return -EFAULT; 1212 1213 if (new_settings.lmi == LMI_DEFAULT) 1214 new_settings.lmi = LMI_ANSI; 1215 1216 if ((new_settings.lmi != LMI_NONE && 1217 new_settings.lmi != LMI_ANSI && 1218 new_settings.lmi != LMI_CCITT && 1219 new_settings.lmi != LMI_CISCO) || 1220 new_settings.t391 < 1 || 1221 new_settings.t392 < 2 || 1222 new_settings.n391 < 1 || 1223 new_settings.n392 < 1 || 1224 new_settings.n393 < new_settings.n392 || 1225 new_settings.n393 > 32 || 1226 (new_settings.dce != 0 && 1227 new_settings.dce != 1)) 1228 return -EINVAL; 1229 1230 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); 1231 if (result) 1232 return result; 1233 1234 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */ 1235 result = attach_hdlc_protocol(dev, &proto, 1236 sizeof(struct frad_state)); 1237 if (result) 1238 return result; 1239 state(hdlc)->first_pvc = NULL; 1240 state(hdlc)->dce_pvc_count = 0; 1241 } 1242 memcpy(&state(hdlc)->settings, &new_settings, size); 1243 dev->type = ARPHRD_FRAD; 1244 call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev); 1245 return 0; 1246 1247 case IF_PROTO_FR_ADD_PVC: 1248 case IF_PROTO_FR_DEL_PVC: 1249 case IF_PROTO_FR_ADD_ETH_PVC: 1250 case IF_PROTO_FR_DEL_ETH_PVC: 1251 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1252 return -EINVAL; 1253 1254 if (!capable(CAP_NET_ADMIN)) 1255 return -EPERM; 1256 1257 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc, 1258 sizeof(fr_proto_pvc))) 1259 return -EFAULT; 1260 1261 if (pvc.dlci <= 0 || pvc.dlci >= 1024) 1262 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */ 1263 1264 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC || 1265 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC) 1266 result = ARPHRD_ETHER; /* bridged Ethernet device */ 1267 else 1268 result = ARPHRD_DLCI; 1269 1270 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC || 1271 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC) 1272 return fr_add_pvc(dev, pvc.dlci, result); 1273 else 1274 return fr_del_pvc(hdlc, pvc.dlci, result); 1275 } 1276 1277 return -EINVAL; 1278 } 1279 1280 1281 static int __init mod_init(void) 1282 { 1283 register_hdlc_protocol(&proto); 1284 return 0; 1285 } 1286 1287 1288 static void __exit mod_exit(void) 1289 { 1290 unregister_hdlc_protocol(&proto); 1291 } 1292 1293 1294 module_init(mod_init); 1295 module_exit(mod_exit); 1296 1297 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 1298 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC"); 1299 MODULE_LICENSE("GPL v2"); 1300