1 /* 2 * Generic HDLC support routines for Linux 3 * Frame Relay support 4 * 5 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of version 2 of the GNU General Public License 9 * as published by the Free Software Foundation. 10 * 11 12 Theory of PVC state 13 14 DCE mode: 15 16 (exist,new) -> 0,0 when "PVC create" or if "link unreliable" 17 0,x -> 1,1 if "link reliable" when sending FULL STATUS 18 1,1 -> 1,0 if received FULL STATUS ACK 19 20 (active) -> 0 when "ifconfig PVC down" or "link unreliable" or "PVC create" 21 -> 1 when "PVC up" and (exist,new) = 1,0 22 23 DTE mode: 24 (exist,new,active) = FULL STATUS if "link reliable" 25 = 0, 0, 0 if "link unreliable" 26 No LMI: 27 active = open and "link reliable" 28 exist = new = not used 29 30 CCITT LMI: ITU-T Q.933 Annex A 31 ANSI LMI: ANSI T1.617 Annex D 32 CISCO LMI: the original, aka "Gang of Four" LMI 33 34 */ 35 36 #include <linux/errno.h> 37 #include <linux/etherdevice.h> 38 #include <linux/hdlc.h> 39 #include <linux/if_arp.h> 40 #include <linux/inetdevice.h> 41 #include <linux/init.h> 42 #include <linux/kernel.h> 43 #include <linux/module.h> 44 #include <linux/pkt_sched.h> 45 #include <linux/poll.h> 46 #include <linux/rtnetlink.h> 47 #include <linux/skbuff.h> 48 #include <linux/slab.h> 49 50 #undef DEBUG_PKT 51 #undef DEBUG_ECN 52 #undef DEBUG_LINK 53 #undef DEBUG_PROTO 54 #undef DEBUG_PVC 55 56 #define FR_UI 0x03 57 #define FR_PAD 0x00 58 59 #define NLPID_IP 0xCC 60 #define NLPID_IPV6 0x8E 61 #define NLPID_SNAP 0x80 62 #define NLPID_PAD 0x00 63 #define NLPID_CCITT_ANSI_LMI 0x08 64 #define NLPID_CISCO_LMI 0x09 65 66 67 #define LMI_CCITT_ANSI_DLCI 0 /* LMI DLCI */ 68 #define LMI_CISCO_DLCI 1023 69 70 #define LMI_CALLREF 0x00 /* Call Reference */ 71 #define LMI_ANSI_LOCKSHIFT 0x95 /* ANSI locking shift */ 72 #define LMI_ANSI_CISCO_REPTYPE 0x01 /* report type */ 73 #define LMI_CCITT_REPTYPE 0x51 74 #define LMI_ANSI_CISCO_ALIVE 0x03 /* keep alive */ 75 #define LMI_CCITT_ALIVE 0x53 76 #define LMI_ANSI_CISCO_PVCSTAT 0x07 /* PVC status */ 77 #define LMI_CCITT_PVCSTAT 0x57 78 79 #define LMI_FULLREP 0x00 /* full report */ 80 #define LMI_INTEGRITY 0x01 /* link integrity report */ 81 #define LMI_SINGLE 0x02 /* single PVC report */ 82 83 #define LMI_STATUS_ENQUIRY 0x75 84 #define LMI_STATUS 0x7D /* reply */ 85 86 #define LMI_REPT_LEN 1 /* report type element length */ 87 #define LMI_INTEG_LEN 2 /* link integrity element length */ 88 89 #define LMI_CCITT_CISCO_LENGTH 13 /* LMI frame lengths */ 90 #define LMI_ANSI_LENGTH 14 91 92 93 typedef struct { 94 #if defined(__LITTLE_ENDIAN_BITFIELD) 95 unsigned ea1: 1; 96 unsigned cr: 1; 97 unsigned dlcih: 6; 98 99 unsigned ea2: 1; 100 unsigned de: 1; 101 unsigned becn: 1; 102 unsigned fecn: 1; 103 unsigned dlcil: 4; 104 #else 105 unsigned dlcih: 6; 106 unsigned cr: 1; 107 unsigned ea1: 1; 108 109 unsigned dlcil: 4; 110 unsigned fecn: 1; 111 unsigned becn: 1; 112 unsigned de: 1; 113 unsigned ea2: 1; 114 #endif 115 }__packed fr_hdr; 116 117 118 typedef struct pvc_device_struct { 119 struct net_device *frad; 120 struct net_device *main; 121 struct net_device *ether; /* bridged Ethernet interface */ 122 struct pvc_device_struct *next; /* Sorted in ascending DLCI order */ 123 int dlci; 124 int open_count; 125 126 struct { 127 unsigned int new: 1; 128 unsigned int active: 1; 129 unsigned int exist: 1; 130 unsigned int deleted: 1; 131 unsigned int fecn: 1; 132 unsigned int becn: 1; 133 unsigned int bandwidth; /* Cisco LMI reporting only */ 134 }state; 135 }pvc_device; 136 137 struct frad_state { 138 fr_proto settings; 139 pvc_device *first_pvc; 140 int dce_pvc_count; 141 142 struct timer_list timer; 143 unsigned long last_poll; 144 int reliable; 145 int dce_changed; 146 int request; 147 int fullrep_sent; 148 u32 last_errors; /* last errors bit list */ 149 u8 n391cnt; 150 u8 txseq; /* TX sequence number */ 151 u8 rxseq; /* RX sequence number */ 152 }; 153 154 155 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr); 156 157 158 static inline u16 q922_to_dlci(u8 *hdr) 159 { 160 return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4); 161 } 162 163 164 static inline void dlci_to_q922(u8 *hdr, u16 dlci) 165 { 166 hdr[0] = (dlci >> 2) & 0xFC; 167 hdr[1] = ((dlci << 4) & 0xF0) | 0x01; 168 } 169 170 171 static inline struct frad_state* state(hdlc_device *hdlc) 172 { 173 return(struct frad_state *)(hdlc->state); 174 } 175 176 177 static inline pvc_device* find_pvc(hdlc_device *hdlc, u16 dlci) 178 { 179 pvc_device *pvc = state(hdlc)->first_pvc; 180 181 while (pvc) { 182 if (pvc->dlci == dlci) 183 return pvc; 184 if (pvc->dlci > dlci) 185 return NULL; /* the list is sorted */ 186 pvc = pvc->next; 187 } 188 189 return NULL; 190 } 191 192 193 static pvc_device* add_pvc(struct net_device *dev, u16 dlci) 194 { 195 hdlc_device *hdlc = dev_to_hdlc(dev); 196 pvc_device *pvc, **pvc_p = &state(hdlc)->first_pvc; 197 198 while (*pvc_p) { 199 if ((*pvc_p)->dlci == dlci) 200 return *pvc_p; 201 if ((*pvc_p)->dlci > dlci) 202 break; /* the list is sorted */ 203 pvc_p = &(*pvc_p)->next; 204 } 205 206 pvc = kzalloc(sizeof(pvc_device), GFP_ATOMIC); 207 #ifdef DEBUG_PVC 208 printk(KERN_DEBUG "add_pvc: allocated pvc %p, frad %p\n", pvc, dev); 209 #endif 210 if (!pvc) 211 return NULL; 212 213 pvc->dlci = dlci; 214 pvc->frad = dev; 215 pvc->next = *pvc_p; /* Put it in the chain */ 216 *pvc_p = pvc; 217 return pvc; 218 } 219 220 221 static inline int pvc_is_used(pvc_device *pvc) 222 { 223 return pvc->main || pvc->ether; 224 } 225 226 227 static inline void pvc_carrier(int on, pvc_device *pvc) 228 { 229 if (on) { 230 if (pvc->main) 231 if (!netif_carrier_ok(pvc->main)) 232 netif_carrier_on(pvc->main); 233 if (pvc->ether) 234 if (!netif_carrier_ok(pvc->ether)) 235 netif_carrier_on(pvc->ether); 236 } else { 237 if (pvc->main) 238 if (netif_carrier_ok(pvc->main)) 239 netif_carrier_off(pvc->main); 240 if (pvc->ether) 241 if (netif_carrier_ok(pvc->ether)) 242 netif_carrier_off(pvc->ether); 243 } 244 } 245 246 247 static inline void delete_unused_pvcs(hdlc_device *hdlc) 248 { 249 pvc_device **pvc_p = &state(hdlc)->first_pvc; 250 251 while (*pvc_p) { 252 if (!pvc_is_used(*pvc_p)) { 253 pvc_device *pvc = *pvc_p; 254 #ifdef DEBUG_PVC 255 printk(KERN_DEBUG "freeing unused pvc: %p\n", pvc); 256 #endif 257 *pvc_p = pvc->next; 258 kfree(pvc); 259 continue; 260 } 261 pvc_p = &(*pvc_p)->next; 262 } 263 } 264 265 266 static inline struct net_device** get_dev_p(pvc_device *pvc, int type) 267 { 268 if (type == ARPHRD_ETHER) 269 return &pvc->ether; 270 else 271 return &pvc->main; 272 } 273 274 275 static int fr_hard_header(struct sk_buff **skb_p, u16 dlci) 276 { 277 u16 head_len; 278 struct sk_buff *skb = *skb_p; 279 280 switch (skb->protocol) { 281 case cpu_to_be16(NLPID_CCITT_ANSI_LMI): 282 head_len = 4; 283 skb_push(skb, head_len); 284 skb->data[3] = NLPID_CCITT_ANSI_LMI; 285 break; 286 287 case cpu_to_be16(NLPID_CISCO_LMI): 288 head_len = 4; 289 skb_push(skb, head_len); 290 skb->data[3] = NLPID_CISCO_LMI; 291 break; 292 293 case cpu_to_be16(ETH_P_IP): 294 head_len = 4; 295 skb_push(skb, head_len); 296 skb->data[3] = NLPID_IP; 297 break; 298 299 case cpu_to_be16(ETH_P_IPV6): 300 head_len = 4; 301 skb_push(skb, head_len); 302 skb->data[3] = NLPID_IPV6; 303 break; 304 305 case cpu_to_be16(ETH_P_802_3): 306 head_len = 10; 307 if (skb_headroom(skb) < head_len) { 308 struct sk_buff *skb2 = skb_realloc_headroom(skb, 309 head_len); 310 if (!skb2) 311 return -ENOBUFS; 312 dev_kfree_skb(skb); 313 skb = *skb_p = skb2; 314 } 315 skb_push(skb, head_len); 316 skb->data[3] = FR_PAD; 317 skb->data[4] = NLPID_SNAP; 318 skb->data[5] = FR_PAD; 319 skb->data[6] = 0x80; 320 skb->data[7] = 0xC2; 321 skb->data[8] = 0x00; 322 skb->data[9] = 0x07; /* bridged Ethernet frame w/out FCS */ 323 break; 324 325 default: 326 head_len = 10; 327 skb_push(skb, head_len); 328 skb->data[3] = FR_PAD; 329 skb->data[4] = NLPID_SNAP; 330 skb->data[5] = FR_PAD; 331 skb->data[6] = FR_PAD; 332 skb->data[7] = FR_PAD; 333 *(__be16*)(skb->data + 8) = skb->protocol; 334 } 335 336 dlci_to_q922(skb->data, dlci); 337 skb->data[2] = FR_UI; 338 return 0; 339 } 340 341 342 343 static int pvc_open(struct net_device *dev) 344 { 345 pvc_device *pvc = dev->ml_priv; 346 347 if ((pvc->frad->flags & IFF_UP) == 0) 348 return -EIO; /* Frad must be UP in order to activate PVC */ 349 350 if (pvc->open_count++ == 0) { 351 hdlc_device *hdlc = dev_to_hdlc(pvc->frad); 352 if (state(hdlc)->settings.lmi == LMI_NONE) 353 pvc->state.active = netif_carrier_ok(pvc->frad); 354 355 pvc_carrier(pvc->state.active, pvc); 356 state(hdlc)->dce_changed = 1; 357 } 358 return 0; 359 } 360 361 362 363 static int pvc_close(struct net_device *dev) 364 { 365 pvc_device *pvc = dev->ml_priv; 366 367 if (--pvc->open_count == 0) { 368 hdlc_device *hdlc = dev_to_hdlc(pvc->frad); 369 if (state(hdlc)->settings.lmi == LMI_NONE) 370 pvc->state.active = 0; 371 372 if (state(hdlc)->settings.dce) { 373 state(hdlc)->dce_changed = 1; 374 pvc->state.active = 0; 375 } 376 } 377 return 0; 378 } 379 380 381 382 static int pvc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 383 { 384 pvc_device *pvc = dev->ml_priv; 385 fr_proto_pvc_info info; 386 387 if (ifr->ifr_settings.type == IF_GET_PROTO) { 388 if (dev->type == ARPHRD_ETHER) 389 ifr->ifr_settings.type = IF_PROTO_FR_ETH_PVC; 390 else 391 ifr->ifr_settings.type = IF_PROTO_FR_PVC; 392 393 if (ifr->ifr_settings.size < sizeof(info)) { 394 /* data size wanted */ 395 ifr->ifr_settings.size = sizeof(info); 396 return -ENOBUFS; 397 } 398 399 info.dlci = pvc->dlci; 400 memcpy(info.master, pvc->frad->name, IFNAMSIZ); 401 if (copy_to_user(ifr->ifr_settings.ifs_ifsu.fr_pvc_info, 402 &info, sizeof(info))) 403 return -EFAULT; 404 return 0; 405 } 406 407 return -EINVAL; 408 } 409 410 static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev) 411 { 412 pvc_device *pvc = dev->ml_priv; 413 414 if (pvc->state.active) { 415 if (dev->type == ARPHRD_ETHER) { 416 int pad = ETH_ZLEN - skb->len; 417 if (pad > 0) { /* Pad the frame with zeros */ 418 int len = skb->len; 419 if (skb_tailroom(skb) < pad) 420 if (pskb_expand_head(skb, 0, pad, 421 GFP_ATOMIC)) { 422 dev->stats.tx_dropped++; 423 dev_kfree_skb(skb); 424 return NETDEV_TX_OK; 425 } 426 skb_put(skb, pad); 427 memset(skb->data + len, 0, pad); 428 } 429 skb->protocol = cpu_to_be16(ETH_P_802_3); 430 } 431 if (!fr_hard_header(&skb, pvc->dlci)) { 432 dev->stats.tx_bytes += skb->len; 433 dev->stats.tx_packets++; 434 if (pvc->state.fecn) /* TX Congestion counter */ 435 dev->stats.tx_compressed++; 436 skb->dev = pvc->frad; 437 dev_queue_xmit(skb); 438 return NETDEV_TX_OK; 439 } 440 } 441 442 dev->stats.tx_dropped++; 443 dev_kfree_skb(skb); 444 return NETDEV_TX_OK; 445 } 446 447 static inline void fr_log_dlci_active(pvc_device *pvc) 448 { 449 printk(KERN_INFO "%s: DLCI %d [%s%s%s]%s %s\n", 450 pvc->frad->name, 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 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 printk(KERN_WARNING "%s: Too many PVCs while sending " 485 "LMI full report\n", dev->name); 486 return; 487 } 488 } 489 490 skb = dev_alloc_skb(len); 491 if (!skb) { 492 printk(KERN_WARNING "%s: Memory squeeze on fr_lmi_send()\n", 493 dev->name); 494 return; 495 } 496 memset(skb->data, 0, len); 497 skb_reserve(skb, 4); 498 if (lmi == LMI_CISCO) { 499 skb->protocol = cpu_to_be16(NLPID_CISCO_LMI); 500 fr_hard_header(&skb, LMI_CISCO_DLCI); 501 } else { 502 skb->protocol = cpu_to_be16(NLPID_CCITT_ANSI_LMI); 503 fr_hard_header(&skb, LMI_CCITT_ANSI_DLCI); 504 } 505 data = skb_tail_pointer(skb); 506 data[i++] = LMI_CALLREF; 507 data[i++] = dce ? LMI_STATUS : LMI_STATUS_ENQUIRY; 508 if (lmi == LMI_ANSI) 509 data[i++] = LMI_ANSI_LOCKSHIFT; 510 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : 511 LMI_ANSI_CISCO_REPTYPE; 512 data[i++] = LMI_REPT_LEN; 513 data[i++] = fullrep ? LMI_FULLREP : LMI_INTEGRITY; 514 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_ALIVE : LMI_ANSI_CISCO_ALIVE; 515 data[i++] = LMI_INTEG_LEN; 516 data[i++] = state(hdlc)->txseq = 517 fr_lmi_nextseq(state(hdlc)->txseq); 518 data[i++] = state(hdlc)->rxseq; 519 520 if (dce && fullrep) { 521 while (pvc) { 522 data[i++] = lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : 523 LMI_ANSI_CISCO_PVCSTAT; 524 data[i++] = stat_len; 525 526 /* LMI start/restart */ 527 if (state(hdlc)->reliable && !pvc->state.exist) { 528 pvc->state.exist = pvc->state.new = 1; 529 fr_log_dlci_active(pvc); 530 } 531 532 /* ifconfig PVC up */ 533 if (pvc->open_count && !pvc->state.active && 534 pvc->state.exist && !pvc->state.new) { 535 pvc_carrier(1, pvc); 536 pvc->state.active = 1; 537 fr_log_dlci_active(pvc); 538 } 539 540 if (lmi == LMI_CISCO) { 541 data[i] = pvc->dlci >> 8; 542 data[i + 1] = pvc->dlci & 0xFF; 543 } else { 544 data[i] = (pvc->dlci >> 4) & 0x3F; 545 data[i + 1] = ((pvc->dlci << 3) & 0x78) | 0x80; 546 data[i + 2] = 0x80; 547 } 548 549 if (pvc->state.new) 550 data[i + 2] |= 0x08; 551 else if (pvc->state.active) 552 data[i + 2] |= 0x02; 553 554 i += stat_len; 555 pvc = pvc->next; 556 } 557 } 558 559 skb_put(skb, i); 560 skb->priority = TC_PRIO_CONTROL; 561 skb->dev = dev; 562 skb_reset_network_header(skb); 563 564 dev_queue_xmit(skb); 565 } 566 567 568 569 static void fr_set_link_state(int reliable, struct net_device *dev) 570 { 571 hdlc_device *hdlc = dev_to_hdlc(dev); 572 pvc_device *pvc = state(hdlc)->first_pvc; 573 574 state(hdlc)->reliable = reliable; 575 if (reliable) { 576 netif_dormant_off(dev); 577 state(hdlc)->n391cnt = 0; /* Request full status */ 578 state(hdlc)->dce_changed = 1; 579 580 if (state(hdlc)->settings.lmi == LMI_NONE) { 581 while (pvc) { /* Activate all PVCs */ 582 pvc_carrier(1, pvc); 583 pvc->state.exist = pvc->state.active = 1; 584 pvc->state.new = 0; 585 pvc = pvc->next; 586 } 587 } 588 } else { 589 netif_dormant_on(dev); 590 while (pvc) { /* Deactivate all PVCs */ 591 pvc_carrier(0, pvc); 592 pvc->state.exist = pvc->state.active = 0; 593 pvc->state.new = 0; 594 if (!state(hdlc)->settings.dce) 595 pvc->state.bandwidth = 0; 596 pvc = pvc->next; 597 } 598 } 599 } 600 601 602 static void fr_timer(unsigned long arg) 603 { 604 struct net_device *dev = (struct net_device *)arg; 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 printk(KERN_INFO "%s: No LMI status reply " 619 "received\n", dev->name); 620 state(hdlc)->last_errors |= 1; 621 } 622 623 list = state(hdlc)->last_errors; 624 for (i = 0; i < state(hdlc)->settings.n393; i++, list >>= 1) 625 cnt += (list & 1); /* errors count */ 626 627 reliable = (cnt < state(hdlc)->settings.n392); 628 } 629 630 if (state(hdlc)->reliable != reliable) { 631 printk(KERN_INFO "%s: Link %sreliable\n", dev->name, 632 reliable ? "" : "un"); 633 fr_set_link_state(reliable, dev); 634 } 635 636 if (state(hdlc)->settings.dce) 637 state(hdlc)->timer.expires = jiffies + 638 state(hdlc)->settings.t392 * HZ; 639 else { 640 if (state(hdlc)->n391cnt) 641 state(hdlc)->n391cnt--; 642 643 fr_lmi_send(dev, state(hdlc)->n391cnt == 0); 644 645 state(hdlc)->last_poll = jiffies; 646 state(hdlc)->request = 1; 647 state(hdlc)->timer.expires = jiffies + 648 state(hdlc)->settings.t391 * HZ; 649 } 650 651 state(hdlc)->timer.function = fr_timer; 652 state(hdlc)->timer.data = arg; 653 add_timer(&state(hdlc)->timer); 654 } 655 656 657 static int fr_lmi_recv(struct net_device *dev, struct sk_buff *skb) 658 { 659 hdlc_device *hdlc = dev_to_hdlc(dev); 660 pvc_device *pvc; 661 u8 rxseq, txseq; 662 int lmi = state(hdlc)->settings.lmi; 663 int dce = state(hdlc)->settings.dce; 664 int stat_len = (lmi == LMI_CISCO) ? 6 : 3, reptype, error, no_ram, i; 665 666 if (skb->len < (lmi == LMI_ANSI ? LMI_ANSI_LENGTH : 667 LMI_CCITT_CISCO_LENGTH)) { 668 printk(KERN_INFO "%s: Short LMI frame\n", dev->name); 669 return 1; 670 } 671 672 if (skb->data[3] != (lmi == LMI_CISCO ? NLPID_CISCO_LMI : 673 NLPID_CCITT_ANSI_LMI)) { 674 printk(KERN_INFO "%s: Received non-LMI frame with LMI DLCI\n", 675 dev->name); 676 return 1; 677 } 678 679 if (skb->data[4] != LMI_CALLREF) { 680 printk(KERN_INFO "%s: Invalid LMI Call reference (0x%02X)\n", 681 dev->name, skb->data[4]); 682 return 1; 683 } 684 685 if (skb->data[5] != (dce ? LMI_STATUS_ENQUIRY : LMI_STATUS)) { 686 printk(KERN_INFO "%s: Invalid LMI Message type (0x%02X)\n", 687 dev->name, skb->data[5]); 688 return 1; 689 } 690 691 if (lmi == LMI_ANSI) { 692 if (skb->data[6] != LMI_ANSI_LOCKSHIFT) { 693 printk(KERN_INFO "%s: Not ANSI locking shift in LMI" 694 " message (0x%02X)\n", dev->name, skb->data[6]); 695 return 1; 696 } 697 i = 7; 698 } else 699 i = 6; 700 701 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_REPTYPE : 702 LMI_ANSI_CISCO_REPTYPE)) { 703 printk(KERN_INFO "%s: Not an LMI Report type IE (0x%02X)\n", 704 dev->name, skb->data[i]); 705 return 1; 706 } 707 708 if (skb->data[++i] != LMI_REPT_LEN) { 709 printk(KERN_INFO "%s: Invalid LMI Report type IE length" 710 " (%u)\n", dev->name, skb->data[i]); 711 return 1; 712 } 713 714 reptype = skb->data[++i]; 715 if (reptype != LMI_INTEGRITY && reptype != LMI_FULLREP) { 716 printk(KERN_INFO "%s: Unsupported LMI Report type (0x%02X)\n", 717 dev->name, reptype); 718 return 1; 719 } 720 721 if (skb->data[++i] != (lmi == LMI_CCITT ? LMI_CCITT_ALIVE : 722 LMI_ANSI_CISCO_ALIVE)) { 723 printk(KERN_INFO "%s: Not an LMI Link integrity verification" 724 " IE (0x%02X)\n", dev->name, skb->data[i]); 725 return 1; 726 } 727 728 if (skb->data[++i] != LMI_INTEG_LEN) { 729 printk(KERN_INFO "%s: Invalid LMI Link integrity verification" 730 " IE length (%u)\n", dev->name, skb->data[i]); 731 return 1; 732 } 733 i++; 734 735 state(hdlc)->rxseq = skb->data[i++]; /* TX sequence from peer */ 736 rxseq = skb->data[i++]; /* Should confirm our sequence */ 737 738 txseq = state(hdlc)->txseq; 739 740 if (dce) 741 state(hdlc)->last_poll = jiffies; 742 743 error = 0; 744 if (!state(hdlc)->reliable) 745 error = 1; 746 747 if (rxseq == 0 || rxseq != txseq) { /* Ask for full report next time */ 748 state(hdlc)->n391cnt = 0; 749 error = 1; 750 } 751 752 if (dce) { 753 if (state(hdlc)->fullrep_sent && !error) { 754 /* Stop sending full report - the last one has been confirmed by DTE */ 755 state(hdlc)->fullrep_sent = 0; 756 pvc = state(hdlc)->first_pvc; 757 while (pvc) { 758 if (pvc->state.new) { 759 pvc->state.new = 0; 760 761 /* Tell DTE that new PVC is now active */ 762 state(hdlc)->dce_changed = 1; 763 } 764 pvc = pvc->next; 765 } 766 } 767 768 if (state(hdlc)->dce_changed) { 769 reptype = LMI_FULLREP; 770 state(hdlc)->fullrep_sent = 1; 771 state(hdlc)->dce_changed = 0; 772 } 773 774 state(hdlc)->request = 1; /* got request */ 775 fr_lmi_send(dev, reptype == LMI_FULLREP ? 1 : 0); 776 return 0; 777 } 778 779 /* DTE */ 780 781 state(hdlc)->request = 0; /* got response, no request pending */ 782 783 if (error) 784 return 0; 785 786 if (reptype != LMI_FULLREP) 787 return 0; 788 789 pvc = state(hdlc)->first_pvc; 790 791 while (pvc) { 792 pvc->state.deleted = 1; 793 pvc = pvc->next; 794 } 795 796 no_ram = 0; 797 while (skb->len >= i + 2 + stat_len) { 798 u16 dlci; 799 u32 bw; 800 unsigned int active, new; 801 802 if (skb->data[i] != (lmi == LMI_CCITT ? LMI_CCITT_PVCSTAT : 803 LMI_ANSI_CISCO_PVCSTAT)) { 804 printk(KERN_INFO "%s: Not an LMI PVC status IE" 805 " (0x%02X)\n", dev->name, skb->data[i]); 806 return 1; 807 } 808 809 if (skb->data[++i] != stat_len) { 810 printk(KERN_INFO "%s: Invalid LMI PVC status IE length" 811 " (%u)\n", dev->name, skb->data[i]); 812 return 1; 813 } 814 i++; 815 816 new = !! (skb->data[i + 2] & 0x08); 817 active = !! (skb->data[i + 2] & 0x02); 818 if (lmi == LMI_CISCO) { 819 dlci = (skb->data[i] << 8) | skb->data[i + 1]; 820 bw = (skb->data[i + 3] << 16) | 821 (skb->data[i + 4] << 8) | 822 (skb->data[i + 5]); 823 } else { 824 dlci = ((skb->data[i] & 0x3F) << 4) | 825 ((skb->data[i + 1] & 0x78) >> 3); 826 bw = 0; 827 } 828 829 pvc = add_pvc(dev, dlci); 830 831 if (!pvc && !no_ram) { 832 printk(KERN_WARNING 833 "%s: Memory squeeze on fr_lmi_recv()\n", 834 dev->name); 835 no_ram = 1; 836 } 837 838 if (pvc) { 839 pvc->state.exist = 1; 840 pvc->state.deleted = 0; 841 if (active != pvc->state.active || 842 new != pvc->state.new || 843 bw != pvc->state.bandwidth || 844 !pvc->state.exist) { 845 pvc->state.new = new; 846 pvc->state.active = active; 847 pvc->state.bandwidth = bw; 848 pvc_carrier(active, pvc); 849 fr_log_dlci_active(pvc); 850 } 851 } 852 853 i += stat_len; 854 } 855 856 pvc = state(hdlc)->first_pvc; 857 858 while (pvc) { 859 if (pvc->state.deleted && pvc->state.exist) { 860 pvc_carrier(0, pvc); 861 pvc->state.active = pvc->state.new = 0; 862 pvc->state.exist = 0; 863 pvc->state.bandwidth = 0; 864 fr_log_dlci_active(pvc); 865 } 866 pvc = pvc->next; 867 } 868 869 /* Next full report after N391 polls */ 870 state(hdlc)->n391cnt = state(hdlc)->settings.n391; 871 872 return 0; 873 } 874 875 876 static int fr_rx(struct sk_buff *skb) 877 { 878 struct net_device *frad = skb->dev; 879 hdlc_device *hdlc = dev_to_hdlc(frad); 880 fr_hdr *fh = (fr_hdr*)skb->data; 881 u8 *data = skb->data; 882 u16 dlci; 883 pvc_device *pvc; 884 struct net_device *dev = NULL; 885 886 if (skb->len <= 4 || fh->ea1 || data[2] != FR_UI) 887 goto rx_error; 888 889 dlci = q922_to_dlci(skb->data); 890 891 if ((dlci == LMI_CCITT_ANSI_DLCI && 892 (state(hdlc)->settings.lmi == LMI_ANSI || 893 state(hdlc)->settings.lmi == LMI_CCITT)) || 894 (dlci == LMI_CISCO_DLCI && 895 state(hdlc)->settings.lmi == LMI_CISCO)) { 896 if (fr_lmi_recv(frad, skb)) 897 goto rx_error; 898 dev_kfree_skb_any(skb); 899 return NET_RX_SUCCESS; 900 } 901 902 pvc = find_pvc(hdlc, dlci); 903 if (!pvc) { 904 #ifdef DEBUG_PKT 905 printk(KERN_INFO "%s: No PVC for received frame's DLCI %d\n", 906 frad->name, dlci); 907 #endif 908 dev_kfree_skb_any(skb); 909 return NET_RX_DROP; 910 } 911 912 if (pvc->state.fecn != fh->fecn) { 913 #ifdef DEBUG_ECN 914 printk(KERN_DEBUG "%s: DLCI %d FECN O%s\n", frad->name, 915 dlci, fh->fecn ? "N" : "FF"); 916 #endif 917 pvc->state.fecn ^= 1; 918 } 919 920 if (pvc->state.becn != fh->becn) { 921 #ifdef DEBUG_ECN 922 printk(KERN_DEBUG "%s: DLCI %d BECN O%s\n", frad->name, 923 dlci, fh->becn ? "N" : "FF"); 924 #endif 925 pvc->state.becn ^= 1; 926 } 927 928 929 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL) { 930 frad->stats.rx_dropped++; 931 return NET_RX_DROP; 932 } 933 934 if (data[3] == NLPID_IP) { 935 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 936 dev = pvc->main; 937 skb->protocol = htons(ETH_P_IP); 938 939 } else if (data[3] == NLPID_IPV6) { 940 skb_pull(skb, 4); /* Remove 4-byte header (hdr, UI, NLPID) */ 941 dev = pvc->main; 942 skb->protocol = htons(ETH_P_IPV6); 943 944 } else if (skb->len > 10 && data[3] == FR_PAD && 945 data[4] == NLPID_SNAP && data[5] == FR_PAD) { 946 u16 oui = ntohs(*(__be16*)(data + 6)); 947 u16 pid = ntohs(*(__be16*)(data + 8)); 948 skb_pull(skb, 10); 949 950 switch ((((u32)oui) << 16) | pid) { 951 case ETH_P_ARP: /* routed frame with SNAP */ 952 case ETH_P_IPX: 953 case ETH_P_IP: /* a long variant */ 954 case ETH_P_IPV6: 955 dev = pvc->main; 956 skb->protocol = htons(pid); 957 break; 958 959 case 0x80C20007: /* bridged Ethernet frame */ 960 if ((dev = pvc->ether) != NULL) 961 skb->protocol = eth_type_trans(skb, dev); 962 break; 963 964 default: 965 printk(KERN_INFO "%s: Unsupported protocol, OUI=%x " 966 "PID=%x\n", frad->name, oui, pid); 967 dev_kfree_skb_any(skb); 968 return NET_RX_DROP; 969 } 970 } else { 971 printk(KERN_INFO "%s: Unsupported protocol, NLPID=%x " 972 "length = %i\n", frad->name, data[3], skb->len); 973 dev_kfree_skb_any(skb); 974 return NET_RX_DROP; 975 } 976 977 if (dev) { 978 dev->stats.rx_packets++; /* PVC traffic */ 979 dev->stats.rx_bytes += skb->len; 980 if (pvc->state.becn) 981 dev->stats.rx_compressed++; 982 skb->dev = dev; 983 netif_rx(skb); 984 return NET_RX_SUCCESS; 985 } else { 986 dev_kfree_skb_any(skb); 987 return NET_RX_DROP; 988 } 989 990 rx_error: 991 frad->stats.rx_errors++; /* Mark error */ 992 dev_kfree_skb_any(skb); 993 return NET_RX_DROP; 994 } 995 996 997 998 static void fr_start(struct net_device *dev) 999 { 1000 hdlc_device *hdlc = dev_to_hdlc(dev); 1001 #ifdef DEBUG_LINK 1002 printk(KERN_DEBUG "fr_start\n"); 1003 #endif 1004 if (state(hdlc)->settings.lmi != LMI_NONE) { 1005 state(hdlc)->reliable = 0; 1006 state(hdlc)->dce_changed = 1; 1007 state(hdlc)->request = 0; 1008 state(hdlc)->fullrep_sent = 0; 1009 state(hdlc)->last_errors = 0xFFFFFFFF; 1010 state(hdlc)->n391cnt = 0; 1011 state(hdlc)->txseq = state(hdlc)->rxseq = 0; 1012 1013 init_timer(&state(hdlc)->timer); 1014 /* First poll after 1 s */ 1015 state(hdlc)->timer.expires = jiffies + HZ; 1016 state(hdlc)->timer.function = fr_timer; 1017 state(hdlc)->timer.data = (unsigned long)dev; 1018 add_timer(&state(hdlc)->timer); 1019 } else 1020 fr_set_link_state(1, dev); 1021 } 1022 1023 1024 static void fr_stop(struct net_device *dev) 1025 { 1026 hdlc_device *hdlc = dev_to_hdlc(dev); 1027 #ifdef DEBUG_LINK 1028 printk(KERN_DEBUG "fr_stop\n"); 1029 #endif 1030 if (state(hdlc)->settings.lmi != LMI_NONE) 1031 del_timer_sync(&state(hdlc)->timer); 1032 fr_set_link_state(0, dev); 1033 } 1034 1035 1036 static void fr_close(struct net_device *dev) 1037 { 1038 hdlc_device *hdlc = dev_to_hdlc(dev); 1039 pvc_device *pvc = state(hdlc)->first_pvc; 1040 1041 while (pvc) { /* Shutdown all PVCs for this FRAD */ 1042 if (pvc->main) 1043 dev_close(pvc->main); 1044 if (pvc->ether) 1045 dev_close(pvc->ether); 1046 pvc = pvc->next; 1047 } 1048 } 1049 1050 1051 static void pvc_setup(struct net_device *dev) 1052 { 1053 dev->type = ARPHRD_DLCI; 1054 dev->flags = IFF_POINTOPOINT; 1055 dev->hard_header_len = 10; 1056 dev->addr_len = 2; 1057 dev->priv_flags &= ~IFF_XMIT_DST_RELEASE; 1058 } 1059 1060 static const struct net_device_ops pvc_ops = { 1061 .ndo_open = pvc_open, 1062 .ndo_stop = pvc_close, 1063 .ndo_change_mtu = hdlc_change_mtu, 1064 .ndo_start_xmit = pvc_xmit, 1065 .ndo_do_ioctl = pvc_ioctl, 1066 }; 1067 1068 static int fr_add_pvc(struct net_device *frad, unsigned int dlci, int type) 1069 { 1070 hdlc_device *hdlc = dev_to_hdlc(frad); 1071 pvc_device *pvc; 1072 struct net_device *dev; 1073 int result, used; 1074 1075 if ((pvc = add_pvc(frad, dlci)) == NULL) { 1076 printk(KERN_WARNING "%s: Memory squeeze on fr_add_pvc()\n", 1077 frad->name); 1078 return -ENOBUFS; 1079 } 1080 1081 if (*get_dev_p(pvc, type)) 1082 return -EEXIST; 1083 1084 used = pvc_is_used(pvc); 1085 1086 if (type == ARPHRD_ETHER) 1087 dev = alloc_netdev(0, "pvceth%d", ether_setup); 1088 else 1089 dev = alloc_netdev(0, "pvc%d", pvc_setup); 1090 1091 if (!dev) { 1092 printk(KERN_WARNING "%s: Memory squeeze on fr_pvc()\n", 1093 frad->name); 1094 delete_unused_pvcs(hdlc); 1095 return -ENOBUFS; 1096 } 1097 1098 if (type == ARPHRD_ETHER) 1099 random_ether_addr(dev->dev_addr); 1100 else { 1101 *(__be16*)dev->dev_addr = htons(dlci); 1102 dlci_to_q922(dev->broadcast, dlci); 1103 } 1104 dev->netdev_ops = &pvc_ops; 1105 dev->mtu = HDLC_MAX_MTU; 1106 dev->tx_queue_len = 0; 1107 dev->ml_priv = pvc; 1108 1109 result = dev_alloc_name(dev, dev->name); 1110 if (result < 0) { 1111 free_netdev(dev); 1112 delete_unused_pvcs(hdlc); 1113 return result; 1114 } 1115 1116 if (register_netdevice(dev) != 0) { 1117 free_netdev(dev); 1118 delete_unused_pvcs(hdlc); 1119 return -EIO; 1120 } 1121 1122 dev->destructor = free_netdev; 1123 *get_dev_p(pvc, type) = dev; 1124 if (!used) { 1125 state(hdlc)->dce_changed = 1; 1126 state(hdlc)->dce_pvc_count++; 1127 } 1128 return 0; 1129 } 1130 1131 1132 1133 static int fr_del_pvc(hdlc_device *hdlc, unsigned int dlci, int type) 1134 { 1135 pvc_device *pvc; 1136 struct net_device *dev; 1137 1138 if ((pvc = find_pvc(hdlc, dlci)) == NULL) 1139 return -ENOENT; 1140 1141 if ((dev = *get_dev_p(pvc, type)) == NULL) 1142 return -ENOENT; 1143 1144 if (dev->flags & IFF_UP) 1145 return -EBUSY; /* PVC in use */ 1146 1147 unregister_netdevice(dev); /* the destructor will free_netdev(dev) */ 1148 *get_dev_p(pvc, type) = NULL; 1149 1150 if (!pvc_is_used(pvc)) { 1151 state(hdlc)->dce_pvc_count--; 1152 state(hdlc)->dce_changed = 1; 1153 } 1154 delete_unused_pvcs(hdlc); 1155 return 0; 1156 } 1157 1158 1159 1160 static void fr_destroy(struct net_device *frad) 1161 { 1162 hdlc_device *hdlc = dev_to_hdlc(frad); 1163 pvc_device *pvc = state(hdlc)->first_pvc; 1164 state(hdlc)->first_pvc = NULL; /* All PVCs destroyed */ 1165 state(hdlc)->dce_pvc_count = 0; 1166 state(hdlc)->dce_changed = 1; 1167 1168 while (pvc) { 1169 pvc_device *next = pvc->next; 1170 /* destructors will free_netdev() main and ether */ 1171 if (pvc->main) 1172 unregister_netdevice(pvc->main); 1173 1174 if (pvc->ether) 1175 unregister_netdevice(pvc->ether); 1176 1177 kfree(pvc); 1178 pvc = next; 1179 } 1180 } 1181 1182 1183 static struct hdlc_proto proto = { 1184 .close = fr_close, 1185 .start = fr_start, 1186 .stop = fr_stop, 1187 .detach = fr_destroy, 1188 .ioctl = fr_ioctl, 1189 .netif_rx = fr_rx, 1190 .module = THIS_MODULE, 1191 }; 1192 1193 1194 static int fr_ioctl(struct net_device *dev, struct ifreq *ifr) 1195 { 1196 fr_proto __user *fr_s = ifr->ifr_settings.ifs_ifsu.fr; 1197 const size_t size = sizeof(fr_proto); 1198 fr_proto new_settings; 1199 hdlc_device *hdlc = dev_to_hdlc(dev); 1200 fr_proto_pvc pvc; 1201 int result; 1202 1203 switch (ifr->ifr_settings.type) { 1204 case IF_GET_PROTO: 1205 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1206 return -EINVAL; 1207 ifr->ifr_settings.type = IF_PROTO_FR; 1208 if (ifr->ifr_settings.size < size) { 1209 ifr->ifr_settings.size = size; /* data size wanted */ 1210 return -ENOBUFS; 1211 } 1212 if (copy_to_user(fr_s, &state(hdlc)->settings, size)) 1213 return -EFAULT; 1214 return 0; 1215 1216 case IF_PROTO_FR: 1217 if (!capable(CAP_NET_ADMIN)) 1218 return -EPERM; 1219 1220 if (dev->flags & IFF_UP) 1221 return -EBUSY; 1222 1223 if (copy_from_user(&new_settings, fr_s, size)) 1224 return -EFAULT; 1225 1226 if (new_settings.lmi == LMI_DEFAULT) 1227 new_settings.lmi = LMI_ANSI; 1228 1229 if ((new_settings.lmi != LMI_NONE && 1230 new_settings.lmi != LMI_ANSI && 1231 new_settings.lmi != LMI_CCITT && 1232 new_settings.lmi != LMI_CISCO) || 1233 new_settings.t391 < 1 || 1234 new_settings.t392 < 2 || 1235 new_settings.n391 < 1 || 1236 new_settings.n392 < 1 || 1237 new_settings.n393 < new_settings.n392 || 1238 new_settings.n393 > 32 || 1239 (new_settings.dce != 0 && 1240 new_settings.dce != 1)) 1241 return -EINVAL; 1242 1243 result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT); 1244 if (result) 1245 return result; 1246 1247 if (dev_to_hdlc(dev)->proto != &proto) { /* Different proto */ 1248 result = attach_hdlc_protocol(dev, &proto, 1249 sizeof(struct frad_state)); 1250 if (result) 1251 return result; 1252 state(hdlc)->first_pvc = NULL; 1253 state(hdlc)->dce_pvc_count = 0; 1254 } 1255 memcpy(&state(hdlc)->settings, &new_settings, size); 1256 dev->type = ARPHRD_FRAD; 1257 return 0; 1258 1259 case IF_PROTO_FR_ADD_PVC: 1260 case IF_PROTO_FR_DEL_PVC: 1261 case IF_PROTO_FR_ADD_ETH_PVC: 1262 case IF_PROTO_FR_DEL_ETH_PVC: 1263 if (dev_to_hdlc(dev)->proto != &proto) /* Different proto */ 1264 return -EINVAL; 1265 1266 if (!capable(CAP_NET_ADMIN)) 1267 return -EPERM; 1268 1269 if (copy_from_user(&pvc, ifr->ifr_settings.ifs_ifsu.fr_pvc, 1270 sizeof(fr_proto_pvc))) 1271 return -EFAULT; 1272 1273 if (pvc.dlci <= 0 || pvc.dlci >= 1024) 1274 return -EINVAL; /* Only 10 bits, DLCI 0 reserved */ 1275 1276 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC || 1277 ifr->ifr_settings.type == IF_PROTO_FR_DEL_ETH_PVC) 1278 result = ARPHRD_ETHER; /* bridged Ethernet device */ 1279 else 1280 result = ARPHRD_DLCI; 1281 1282 if (ifr->ifr_settings.type == IF_PROTO_FR_ADD_PVC || 1283 ifr->ifr_settings.type == IF_PROTO_FR_ADD_ETH_PVC) 1284 return fr_add_pvc(dev, pvc.dlci, result); 1285 else 1286 return fr_del_pvc(hdlc, pvc.dlci, result); 1287 } 1288 1289 return -EINVAL; 1290 } 1291 1292 1293 static int __init mod_init(void) 1294 { 1295 register_hdlc_protocol(&proto); 1296 return 0; 1297 } 1298 1299 1300 static void __exit mod_exit(void) 1301 { 1302 unregister_hdlc_protocol(&proto); 1303 } 1304 1305 1306 module_init(mod_init); 1307 module_exit(mod_exit); 1308 1309 MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>"); 1310 MODULE_DESCRIPTION("Frame-Relay protocol support for generic HDLC"); 1311 MODULE_LICENSE("GPL v2"); 1312