/drivers/isdn/i4l/isdn_net.c
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Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
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1/* $Id: isdn_net.c,v 1.1.2.2 2004/01/12 22:37:19 keil Exp $ 2 * 3 * Linux ISDN subsystem, network interfaces and related functions (linklevel). 4 * 5 * Copyright 1994-1998 by Fritz Elfert (fritz@isdn4linux.de) 6 * Copyright 1995,96 by Thinking Objects Software GmbH Wuerzburg 7 * Copyright 1995,96 by Michael Hipp (Michael.Hipp@student.uni-tuebingen.de) 8 * 9 * This software may be used and distributed according to the terms 10 * of the GNU General Public License, incorporated herein by reference. 11 * 12 * Data Over Voice (DOV) support added - Guy Ellis 23-Mar-02 13 * guy@traverse.com.au 14 * Outgoing calls - looks for a 'V' in first char of dialed number 15 * Incoming calls - checks first character of eaz as follows: 16 * Numeric - accept DATA only - original functionality 17 * 'V' - accept VOICE (DOV) only 18 * 'B' - accept BOTH DATA and DOV types 19 * 20 * Jan 2001: fix CISCO HDLC Bjoern A. Zeeb <i4l@zabbadoz.net> 21 * for info on the protocol, see 22 * http://i4l.zabbadoz.net/i4l/cisco-hdlc.txt 23 */ 24 25#include <linux/isdn.h> 26#include <linux/slab.h> 27#include <net/arp.h> 28#include <net/dst.h> 29#include <net/pkt_sched.h> 30#include <linux/inetdevice.h> 31#include "isdn_common.h" 32#include "isdn_net.h" 33#ifdef CONFIG_ISDN_PPP 34#include "isdn_ppp.h" 35#endif 36#ifdef CONFIG_ISDN_X25 37#include <linux/concap.h> 38#include "isdn_concap.h" 39#endif 40 41 42/* 43 * Outline of new tbusy handling: 44 * 45 * Old method, roughly spoken, consisted of setting tbusy when entering 46 * isdn_net_start_xmit() and at several other locations and clearing 47 * it from isdn_net_start_xmit() thread when sending was successful. 48 * 49 * With 2.3.x multithreaded network core, to prevent problems, tbusy should 50 * only be set by the isdn_net_start_xmit() thread and only when a tx-busy 51 * condition is detected. Other threads (in particular isdn_net_stat_callb()) 52 * are only allowed to clear tbusy. 53 * 54 * -HE 55 */ 56 57/* 58 * About SOFTNET: 59 * Most of the changes were pretty obvious and basically done by HE already. 60 * 61 * One problem of the isdn net device code is that is uses struct net_device 62 * for masters and slaves. However, only master interface are registered to 63 * the network layer, and therefore, it only makes sense to call netif_* 64 * functions on them. 65 * 66 * --KG 67 */ 68 69/* 70 * Find out if the netdevice has been ifup-ed yet. 71 * For slaves, look at the corresponding master. 72 */ 73static __inline__ int isdn_net_device_started(isdn_net_dev *n) 74{ 75 isdn_net_local *lp = n->local; 76 struct net_device *dev; 77 78 if (lp->master) 79 dev = lp->master; 80 else 81 dev = n->dev; 82 return netif_running(dev); 83} 84 85/* 86 * wake up the network -> net_device queue. 87 * For slaves, wake the corresponding master interface. 88 */ 89static __inline__ void isdn_net_device_wake_queue(isdn_net_local *lp) 90{ 91 if (lp->master) 92 netif_wake_queue(lp->master); 93 else 94 netif_wake_queue(lp->netdev->dev); 95} 96 97/* 98 * stop the network -> net_device queue. 99 * For slaves, stop the corresponding master interface. 100 */ 101static __inline__ void isdn_net_device_stop_queue(isdn_net_local *lp) 102{ 103 if (lp->master) 104 netif_stop_queue(lp->master); 105 else 106 netif_stop_queue(lp->netdev->dev); 107} 108 109/* 110 * find out if the net_device which this lp belongs to (lp can be 111 * master or slave) is busy. It's busy iff all (master and slave) 112 * queues are busy 113 */ 114static __inline__ int isdn_net_device_busy(isdn_net_local *lp) 115{ 116 isdn_net_local *nlp; 117 isdn_net_dev *nd; 118 unsigned long flags; 119 120 if (!isdn_net_lp_busy(lp)) 121 return 0; 122 123 if (lp->master) 124 nd = ISDN_MASTER_PRIV(lp)->netdev; 125 else 126 nd = lp->netdev; 127 128 spin_lock_irqsave(&nd->queue_lock, flags); 129 nlp = lp->next; 130 while (nlp != lp) { 131 if (!isdn_net_lp_busy(nlp)) { 132 spin_unlock_irqrestore(&nd->queue_lock, flags); 133 return 0; 134 } 135 nlp = nlp->next; 136 } 137 spin_unlock_irqrestore(&nd->queue_lock, flags); 138 return 1; 139} 140 141static __inline__ void isdn_net_inc_frame_cnt(isdn_net_local *lp) 142{ 143 atomic_inc(&lp->frame_cnt); 144 if (isdn_net_device_busy(lp)) 145 isdn_net_device_stop_queue(lp); 146} 147 148static __inline__ void isdn_net_dec_frame_cnt(isdn_net_local *lp) 149{ 150 atomic_dec(&lp->frame_cnt); 151 152 if (!(isdn_net_device_busy(lp))) { 153 if (!skb_queue_empty(&lp->super_tx_queue)) { 154 schedule_work(&lp->tqueue); 155 } else { 156 isdn_net_device_wake_queue(lp); 157 } 158 } 159} 160 161static __inline__ void isdn_net_zero_frame_cnt(isdn_net_local *lp) 162{ 163 atomic_set(&lp->frame_cnt, 0); 164} 165 166/* For 2.2.x we leave the transmitter busy timeout at 2 secs, just 167 * to be safe. 168 * For 2.3.x we push it up to 20 secs, because call establishment 169 * (in particular callback) may take such a long time, and we 170 * don't want confusing messages in the log. However, there is a slight 171 * possibility that this large timeout will break other things like MPPP, 172 * which might rely on the tx timeout. If so, we'll find out this way... 173 */ 174 175#define ISDN_NET_TX_TIMEOUT (20*HZ) 176 177/* Prototypes */ 178 179static int isdn_net_force_dial_lp(isdn_net_local *); 180static netdev_tx_t isdn_net_start_xmit(struct sk_buff *, 181 struct net_device *); 182 183static void isdn_net_ciscohdlck_connected(isdn_net_local *lp); 184static void isdn_net_ciscohdlck_disconnected(isdn_net_local *lp); 185 186char *isdn_net_revision = "$Revision: 1.1.2.2 $"; 187 188 /* 189 * Code for raw-networking over ISDN 190 */ 191 192static void 193isdn_net_unreachable(struct net_device *dev, struct sk_buff *skb, char *reason) 194{ 195 if(skb) { 196 197 u_short proto = ntohs(skb->protocol); 198 199 printk(KERN_DEBUG "isdn_net: %s: %s, signalling dst_link_failure %s\n", 200 dev->name, 201 (reason != NULL) ? reason : "unknown", 202 (proto != ETH_P_IP) ? "Protocol != ETH_P_IP" : ""); 203 204 dst_link_failure(skb); 205 } 206 else { /* dial not triggered by rawIP packet */ 207 printk(KERN_DEBUG "isdn_net: %s: %s\n", 208 dev->name, 209 (reason != NULL) ? reason : "reason unknown"); 210 } 211} 212 213static void 214isdn_net_reset(struct net_device *dev) 215{ 216#ifdef CONFIG_ISDN_X25 217 struct concap_device_ops * dops = 218 ((isdn_net_local *) netdev_priv(dev))->dops; 219 struct concap_proto * cprot = 220 ((isdn_net_local *) netdev_priv(dev))->netdev->cprot; 221#endif 222#ifdef CONFIG_ISDN_X25 223 if( cprot && cprot -> pops && dops ) 224 cprot -> pops -> restart ( cprot, dev, dops ); 225#endif 226} 227 228/* Open/initialize the board. */ 229static int 230isdn_net_open(struct net_device *dev) 231{ 232 int i; 233 struct net_device *p; 234 struct in_device *in_dev; 235 236 /* moved here from isdn_net_reset, because only the master has an 237 interface associated which is supposed to be started. BTW: 238 we need to call netif_start_queue, not netif_wake_queue here */ 239 netif_start_queue(dev); 240 241 isdn_net_reset(dev); 242 /* Fill in the MAC-level header (not needed, but for compatibility... */ 243 for (i = 0; i < ETH_ALEN - sizeof(u32); i++) 244 dev->dev_addr[i] = 0xfc; 245 if ((in_dev = dev->ip_ptr) != NULL) { 246 /* 247 * Any address will do - we take the first 248 */ 249 struct in_ifaddr *ifa = in_dev->ifa_list; 250 if (ifa != NULL) 251 memcpy(dev->dev_addr+2, &ifa->ifa_local, 4); 252 } 253 254 /* If this interface has slaves, start them also */ 255 p = MASTER_TO_SLAVE(dev); 256 if (p) { 257 while (p) { 258 isdn_net_reset(p); 259 p = MASTER_TO_SLAVE(p); 260 } 261 } 262 isdn_lock_drivers(); 263 return 0; 264} 265 266/* 267 * Assign an ISDN-channel to a net-interface 268 */ 269static void 270isdn_net_bind_channel(isdn_net_local * lp, int idx) 271{ 272 lp->flags |= ISDN_NET_CONNECTED; 273 lp->isdn_device = dev->drvmap[idx]; 274 lp->isdn_channel = dev->chanmap[idx]; 275 dev->rx_netdev[idx] = lp->netdev; 276 dev->st_netdev[idx] = lp->netdev; 277} 278 279/* 280 * unbind a net-interface (resets interface after an error) 281 */ 282static void 283isdn_net_unbind_channel(isdn_net_local * lp) 284{ 285 skb_queue_purge(&lp->super_tx_queue); 286 287 if (!lp->master) { /* reset only master device */ 288 /* Moral equivalent of dev_purge_queues(): 289 BEWARE! This chunk of code cannot be called from hardware 290 interrupt handler. I hope it is true. --ANK 291 */ 292 qdisc_reset_all_tx(lp->netdev->dev); 293 } 294 lp->dialstate = 0; 295 dev->rx_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL; 296 dev->st_netdev[isdn_dc2minor(lp->isdn_device, lp->isdn_channel)] = NULL; 297 if (lp->isdn_device != -1 && lp->isdn_channel != -1) 298 isdn_free_channel(lp->isdn_device, lp->isdn_channel, 299 ISDN_USAGE_NET); 300 lp->flags &= ~ISDN_NET_CONNECTED; 301 lp->isdn_device = -1; 302 lp->isdn_channel = -1; 303} 304 305/* 306 * Perform auto-hangup and cps-calculation for net-interfaces. 307 * 308 * auto-hangup: 309 * Increment idle-counter (this counter is reset on any incoming or 310 * outgoing packet), if counter exceeds configured limit either do a 311 * hangup immediately or - if configured - wait until just before the next 312 * charge-info. 313 * 314 * cps-calculation (needed for dynamic channel-bundling): 315 * Since this function is called every second, simply reset the 316 * byte-counter of the interface after copying it to the cps-variable. 317 */ 318static unsigned long last_jiffies = -HZ; 319 320void 321isdn_net_autohup(void) 322{ 323 isdn_net_dev *p = dev->netdev; 324 int anymore; 325 326 anymore = 0; 327 while (p) { 328 isdn_net_local *l = p->local; 329 if (jiffies == last_jiffies) 330 l->cps = l->transcount; 331 else 332 l->cps = (l->transcount * HZ) / (jiffies - last_jiffies); 333 l->transcount = 0; 334 if (dev->net_verbose > 3) 335 printk(KERN_DEBUG "%s: %d bogocps\n", p->dev->name, l->cps); 336 if ((l->flags & ISDN_NET_CONNECTED) && (!l->dialstate)) { 337 anymore = 1; 338 l->huptimer++; 339 /* 340 * if there is some dialmode where timeout-hangup 341 * should _not_ be done, check for that here 342 */ 343 if ((l->onhtime) && 344 (l->huptimer > l->onhtime)) 345 { 346 if (l->hupflags & ISDN_MANCHARGE && 347 l->hupflags & ISDN_CHARGEHUP) { 348 while (time_after(jiffies, l->chargetime + l->chargeint)) 349 l->chargetime += l->chargeint; 350 if (time_after(jiffies, l->chargetime + l->chargeint - 2 * HZ)) 351 if (l->outgoing || l->hupflags & ISDN_INHUP) 352 isdn_net_hangup(p->dev); 353 } else if (l->outgoing) { 354 if (l->hupflags & ISDN_CHARGEHUP) { 355 if (l->hupflags & ISDN_WAITCHARGE) { 356 printk(KERN_DEBUG "isdn_net: Hupflags of %s are %X\n", 357 p->dev->name, l->hupflags); 358 isdn_net_hangup(p->dev); 359 } else if (time_after(jiffies, l->chargetime + l->chargeint)) { 360 printk(KERN_DEBUG 361 "isdn_net: %s: chtime = %lu, chint = %d\n", 362 p->dev->name, l->chargetime, l->chargeint); 363 isdn_net_hangup(p->dev); 364 } 365 } else 366 isdn_net_hangup(p->dev); 367 } else if (l->hupflags & ISDN_INHUP) 368 isdn_net_hangup(p->dev); 369 } 370 371 if(dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*l) == ISDN_NET_DM_OFF)) { 372 isdn_net_hangup(p->dev); 373 break; 374 } 375 } 376 p = (isdn_net_dev *) p->next; 377 } 378 last_jiffies = jiffies; 379 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, anymore); 380} 381 382static void isdn_net_lp_disconnected(isdn_net_local *lp) 383{ 384 isdn_net_rm_from_bundle(lp); 385} 386 387/* 388 * Handle status-messages from ISDN-interfacecard. 389 * This function is called from within the main-status-dispatcher 390 * isdn_status_callback, which itself is called from the low-level driver. 391 * Return: 1 = Event handled, 0 = not for us or unknown Event. 392 */ 393int 394isdn_net_stat_callback(int idx, isdn_ctrl *c) 395{ 396 isdn_net_dev *p = dev->st_netdev[idx]; 397 int cmd = c->command; 398 399 if (p) { 400 isdn_net_local *lp = p->local; 401#ifdef CONFIG_ISDN_X25 402 struct concap_proto *cprot = lp->netdev->cprot; 403 struct concap_proto_ops *pops = cprot ? cprot->pops : NULL; 404#endif 405 switch (cmd) { 406 case ISDN_STAT_BSENT: 407 /* A packet has successfully been sent out */ 408 if ((lp->flags & ISDN_NET_CONNECTED) && 409 (!lp->dialstate)) { 410 isdn_net_dec_frame_cnt(lp); 411 lp->stats.tx_packets++; 412 lp->stats.tx_bytes += c->parm.length; 413 } 414 return 1; 415 case ISDN_STAT_DCONN: 416 /* D-Channel is up */ 417 switch (lp->dialstate) { 418 case 4: 419 case 7: 420 case 8: 421 lp->dialstate++; 422 return 1; 423 case 12: 424 lp->dialstate = 5; 425 return 1; 426 } 427 break; 428 case ISDN_STAT_DHUP: 429 /* Either D-Channel-hangup or error during dialout */ 430#ifdef CONFIG_ISDN_X25 431 /* If we are not connencted then dialing had 432 failed. If there are generic encap protocol 433 receiver routines signal the closure of 434 the link*/ 435 436 if( !(lp->flags & ISDN_NET_CONNECTED) 437 && pops && pops -> disconn_ind ) 438 pops -> disconn_ind(cprot); 439#endif /* CONFIG_ISDN_X25 */ 440 if ((!lp->dialstate) && (lp->flags & ISDN_NET_CONNECTED)) { 441 if (lp->p_encap == ISDN_NET_ENCAP_CISCOHDLCK) 442 isdn_net_ciscohdlck_disconnected(lp); 443#ifdef CONFIG_ISDN_PPP 444 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) 445 isdn_ppp_free(lp); 446#endif 447 isdn_net_lp_disconnected(lp); 448 isdn_all_eaz(lp->isdn_device, lp->isdn_channel); 449 printk(KERN_INFO "%s: remote hangup\n", p->dev->name); 450 printk(KERN_INFO "%s: Chargesum is %d\n", p->dev->name, 451 lp->charge); 452 isdn_net_unbind_channel(lp); 453 return 1; 454 } 455 break; 456#ifdef CONFIG_ISDN_X25 457 case ISDN_STAT_BHUP: 458 /* B-Channel-hangup */ 459 /* try if there are generic encap protocol 460 receiver routines and signal the closure of 461 the link */ 462 if( pops && pops -> disconn_ind ){ 463 pops -> disconn_ind(cprot); 464 return 1; 465 } 466 break; 467#endif /* CONFIG_ISDN_X25 */ 468 case ISDN_STAT_BCONN: 469 /* B-Channel is up */ 470 isdn_net_zero_frame_cnt(lp); 471 switch (lp->dialstate) { 472 case 5: 473 case 6: 474 case 7: 475 case 8: 476 case 9: 477 case 10: 478 case 12: 479 if (lp->dialstate <= 6) { 480 dev->usage[idx] |= ISDN_USAGE_OUTGOING; 481 isdn_info_update(); 482 } else 483 dev->rx_netdev[idx] = p; 484 lp->dialstate = 0; 485 isdn_timer_ctrl(ISDN_TIMER_NETHANGUP, 1); 486 if (lp->p_encap == ISDN_NET_ENCAP_CISCOHDLCK) 487 isdn_net_ciscohdlck_connected(lp); 488 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP) { 489 if (lp->master) { /* is lp a slave? */ 490 isdn_net_dev *nd = ISDN_MASTER_PRIV(lp)->netdev; 491 isdn_net_add_to_bundle(nd, lp); 492 } 493 } 494 printk(KERN_INFO "isdn_net: %s connected\n", p->dev->name); 495 /* If first Chargeinfo comes before B-Channel connect, 496 * we correct the timestamp here. 497 */ 498 lp->chargetime = jiffies; 499 500 /* reset dial-timeout */ 501 lp->dialstarted = 0; 502 lp->dialwait_timer = 0; 503 504#ifdef CONFIG_ISDN_PPP 505 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) 506 isdn_ppp_wakeup_daemon(lp); 507#endif 508#ifdef CONFIG_ISDN_X25 509 /* try if there are generic concap receiver routines */ 510 if( pops ) 511 if( pops->connect_ind) 512 pops->connect_ind(cprot); 513#endif /* CONFIG_ISDN_X25 */ 514 /* ppp needs to do negotiations first */ 515 if (lp->p_encap != ISDN_NET_ENCAP_SYNCPPP) 516 isdn_net_device_wake_queue(lp); 517 return 1; 518 } 519 break; 520 case ISDN_STAT_NODCH: 521 /* No D-Channel avail. */ 522 if (lp->dialstate == 4) { 523 lp->dialstate--; 524 return 1; 525 } 526 break; 527 case ISDN_STAT_CINF: 528 /* Charge-info from TelCo. Calculate interval between 529 * charge-infos and set timestamp for last info for 530 * usage by isdn_net_autohup() 531 */ 532 lp->charge++; 533 if (lp->hupflags & ISDN_HAVECHARGE) { 534 lp->hupflags &= ~ISDN_WAITCHARGE; 535 lp->chargeint = jiffies - lp->chargetime - (2 * HZ); 536 } 537 if (lp->hupflags & ISDN_WAITCHARGE) 538 lp->hupflags |= ISDN_HAVECHARGE; 539 lp->chargetime = jiffies; 540 printk(KERN_DEBUG "isdn_net: Got CINF chargetime of %s now %lu\n", 541 p->dev->name, lp->chargetime); 542 return 1; 543 } 544 } 545 return 0; 546} 547 548/* 549 * Perform dialout for net-interfaces and timeout-handling for 550 * D-Channel-up and B-Channel-up Messages. 551 * This function is initially called from within isdn_net_start_xmit() or 552 * or isdn_net_find_icall() after initializing the dialstate for an 553 * interface. If further calls are needed, the function schedules itself 554 * for a timer-callback via isdn_timer_function(). 555 * The dialstate is also affected by incoming status-messages from 556 * the ISDN-Channel which are handled in isdn_net_stat_callback() above. 557 */ 558void 559isdn_net_dial(void) 560{ 561 isdn_net_dev *p = dev->netdev; 562 int anymore = 0; 563 int i; 564 isdn_ctrl cmd; 565 u_char *phone_number; 566 567 while (p) { 568 isdn_net_local *lp = p->local; 569 570#ifdef ISDN_DEBUG_NET_DIAL 571 if (lp->dialstate) 572 printk(KERN_DEBUG "%s: dialstate=%d\n", p->dev->name, lp->dialstate); 573#endif 574 switch (lp->dialstate) { 575 case 0: 576 /* Nothing to do for this interface */ 577 break; 578 case 1: 579 /* Initiate dialout. Set phone-number-pointer to first number 580 * of interface. 581 */ 582 lp->dial = lp->phone[1]; 583 if (!lp->dial) { 584 printk(KERN_WARNING "%s: phone number deleted?\n", 585 p->dev->name); 586 isdn_net_hangup(p->dev); 587 break; 588 } 589 anymore = 1; 590 591 if(lp->dialtimeout > 0) 592 if(lp->dialstarted == 0 || time_after(jiffies, lp->dialstarted + lp->dialtimeout + lp->dialwait)) { 593 lp->dialstarted = jiffies; 594 lp->dialwait_timer = 0; 595 } 596 597 lp->dialstate++; 598 /* Fall through */ 599 case 2: 600 /* Prepare dialing. Clear EAZ, then set EAZ. */ 601 cmd.driver = lp->isdn_device; 602 cmd.arg = lp->isdn_channel; 603 cmd.command = ISDN_CMD_CLREAZ; 604 isdn_command(&cmd); 605 sprintf(cmd.parm.num, "%s", isdn_map_eaz2msn(lp->msn, cmd.driver)); 606 cmd.command = ISDN_CMD_SETEAZ; 607 isdn_command(&cmd); 608 lp->dialretry = 0; 609 anymore = 1; 610 lp->dialstate++; 611 /* Fall through */ 612 case 3: 613 /* Setup interface, dial current phone-number, switch to next number. 614 * If list of phone-numbers is exhausted, increment 615 * retry-counter. 616 */ 617 if(dev->global_flags & ISDN_GLOBAL_STOPPED || (ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_OFF)) { 618 char *s; 619 if (dev->global_flags & ISDN_GLOBAL_STOPPED) 620 s = "dial suppressed: isdn system stopped"; 621 else 622 s = "dial suppressed: dialmode `off'"; 623 isdn_net_unreachable(p->dev, NULL, s); 624 isdn_net_hangup(p->dev); 625 break; 626 } 627 cmd.driver = lp->isdn_device; 628 cmd.command = ISDN_CMD_SETL2; 629 cmd.arg = lp->isdn_channel + (lp->l2_proto << 8); 630 isdn_command(&cmd); 631 cmd.driver = lp->isdn_device; 632 cmd.command = ISDN_CMD_SETL3; 633 cmd.arg = lp->isdn_channel + (lp->l3_proto << 8); 634 isdn_command(&cmd); 635 cmd.driver = lp->isdn_device; 636 cmd.arg = lp->isdn_channel; 637 if (!lp->dial) { 638 printk(KERN_WARNING "%s: phone number deleted?\n", 639 p->dev->name); 640 isdn_net_hangup(p->dev); 641 break; 642 } 643 if (!strncmp(lp->dial->num, "LEASED", strlen("LEASED"))) { 644 lp->dialstate = 4; 645 printk(KERN_INFO "%s: Open leased line ...\n", p->dev->name); 646 } else { 647 if(lp->dialtimeout > 0) 648 if (time_after(jiffies, lp->dialstarted + lp->dialtimeout)) { 649 lp->dialwait_timer = jiffies + lp->dialwait; 650 lp->dialstarted = 0; 651 isdn_net_unreachable(p->dev, NULL, "dial: timed out"); 652 isdn_net_hangup(p->dev); 653 break; 654 } 655 656 cmd.driver = lp->isdn_device; 657 cmd.command = ISDN_CMD_DIAL; 658 cmd.parm.setup.si2 = 0; 659 660 /* check for DOV */ 661 phone_number = lp->dial->num; 662 if ((*phone_number == 'v') || 663 (*phone_number == 'V')) { /* DOV call */ 664 cmd.parm.setup.si1 = 1; 665 } else { /* DATA call */ 666 cmd.parm.setup.si1 = 7; 667 } 668 669 strcpy(cmd.parm.setup.phone, phone_number); 670 /* 671 * Switch to next number or back to start if at end of list. 672 */ 673 if (!(lp->dial = (isdn_net_phone *) lp->dial->next)) { 674 lp->dial = lp->phone[1]; 675 lp->dialretry++; 676 677 if (lp->dialretry > lp->dialmax) { 678 if (lp->dialtimeout == 0) { 679 lp->dialwait_timer = jiffies + lp->dialwait; 680 lp->dialstarted = 0; 681 isdn_net_unreachable(p->dev, NULL, "dial: tried all numbers dialmax times"); 682 } 683 isdn_net_hangup(p->dev); 684 break; 685 } 686 } 687 sprintf(cmd.parm.setup.eazmsn, "%s", 688 isdn_map_eaz2msn(lp->msn, cmd.driver)); 689 i = isdn_dc2minor(lp->isdn_device, lp->isdn_channel); 690 if (i >= 0) { 691 strcpy(dev->num[i], cmd.parm.setup.phone); 692 dev->usage[i] |= ISDN_USAGE_OUTGOING; 693 isdn_info_update(); 694 } 695 printk(KERN_INFO "%s: dialing %d %s... %s\n", p->dev->name, 696 lp->dialretry, cmd.parm.setup.phone, 697 (cmd.parm.setup.si1 == 1) ? "DOV" : ""); 698 lp->dtimer = 0; 699#ifdef ISDN_DEBUG_NET_DIAL 700 printk(KERN_DEBUG "dial: d=%d c=%d\n", lp->isdn_device, 701 lp->isdn_channel); 702#endif 703 isdn_command(&cmd); 704 } 705 lp->huptimer = 0; 706 lp->outgoing = 1; 707 if (lp->chargeint) { 708 lp->hupflags |= ISDN_HAVECHARGE; 709 lp->hupflags &= ~ISDN_WAITCHARGE; 710 } else { 711 lp->hupflags |= ISDN_WAITCHARGE; 712 lp->hupflags &= ~ISDN_HAVECHARGE; 713 } 714 anymore = 1; 715 lp->dialstate = 716 (lp->cbdelay && 717 (lp->flags & ISDN_NET_CBOUT)) ? 12 : 4; 718 break; 719 case 4: 720 /* Wait for D-Channel-connect. 721 * If timeout, switch back to state 3. 722 * Dialmax-handling moved to state 3. 723 */ 724 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10) 725 lp->dialstate = 3; 726 anymore = 1; 727 break; 728 case 5: 729 /* Got D-Channel-Connect, send B-Channel-request */ 730 cmd.driver = lp->isdn_device; 731 cmd.arg = lp->isdn_channel; 732 cmd.command = ISDN_CMD_ACCEPTB; 733 anymore = 1; 734 lp->dtimer = 0; 735 lp->dialstate++; 736 isdn_command(&cmd); 737 break; 738 case 6: 739 /* Wait for B- or D-Channel-connect. If timeout, 740 * switch back to state 3. 741 */ 742#ifdef ISDN_DEBUG_NET_DIAL 743 printk(KERN_DEBUG "dialtimer2: %d\n", lp->dtimer); 744#endif 745 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10) 746 lp->dialstate = 3; 747 anymore = 1; 748 break; 749 case 7: 750 /* Got incoming Call, setup L2 and L3 protocols, 751 * then wait for D-Channel-connect 752 */ 753#ifdef ISDN_DEBUG_NET_DIAL 754 printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer); 755#endif 756 cmd.driver = lp->isdn_device; 757 cmd.command = ISDN_CMD_SETL2; 758 cmd.arg = lp->isdn_channel + (lp->l2_proto << 8); 759 isdn_command(&cmd); 760 cmd.driver = lp->isdn_device; 761 cmd.command = ISDN_CMD_SETL3; 762 cmd.arg = lp->isdn_channel + (lp->l3_proto << 8); 763 isdn_command(&cmd); 764 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT15) 765 isdn_net_hangup(p->dev); 766 else { 767 anymore = 1; 768 lp->dialstate++; 769 } 770 break; 771 case 9: 772 /* Got incoming D-Channel-Connect, send B-Channel-request */ 773 cmd.driver = lp->isdn_device; 774 cmd.arg = lp->isdn_channel; 775 cmd.command = ISDN_CMD_ACCEPTB; 776 isdn_command(&cmd); 777 anymore = 1; 778 lp->dtimer = 0; 779 lp->dialstate++; 780 break; 781 case 8: 782 case 10: 783 /* Wait for B- or D-channel-connect */ 784#ifdef ISDN_DEBUG_NET_DIAL 785 printk(KERN_DEBUG "dialtimer4: %d\n", lp->dtimer); 786#endif 787 if (lp->dtimer++ > ISDN_TIMER_DTIMEOUT10) 788 isdn_net_hangup(p->dev); 789 else 790 anymore = 1; 791 break; 792 case 11: 793 /* Callback Delay */ 794 if (lp->dtimer++ > lp->cbdelay) 795 lp->dialstate = 1; 796 anymore = 1; 797 break; 798 case 12: 799 /* Remote does callback. Hangup after cbdelay, then wait for incoming 800 * call (in state 4). 801 */ 802 if (lp->dtimer++ > lp->cbdelay) 803 { 804 printk(KERN_INFO "%s: hangup waiting for callback ...\n", p->dev->name); 805 lp->dtimer = 0; 806 lp->dialstate = 4; 807 cmd.driver = lp->isdn_device; 808 cmd.command = ISDN_CMD_HANGUP; 809 cmd.arg = lp->isdn_channel; 810 isdn_command(&cmd); 811 isdn_all_eaz(lp->isdn_device, lp->isdn_channel); 812 } 813 anymore = 1; 814 break; 815 default: 816 printk(KERN_WARNING "isdn_net: Illegal dialstate %d for device %s\n", 817 lp->dialstate, p->dev->name); 818 } 819 p = (isdn_net_dev *) p->next; 820 } 821 isdn_timer_ctrl(ISDN_TIMER_NETDIAL, anymore); 822} 823 824/* 825 * Perform hangup for a net-interface. 826 */ 827void 828isdn_net_hangup(struct net_device *d) 829{ 830 isdn_net_local *lp = netdev_priv(d); 831 isdn_ctrl cmd; 832#ifdef CONFIG_ISDN_X25 833 struct concap_proto *cprot = lp->netdev->cprot; 834 struct concap_proto_ops *pops = cprot ? cprot->pops : NULL; 835#endif 836 837 if (lp->flags & ISDN_NET_CONNECTED) { 838 if (lp->slave != NULL) { 839 isdn_net_local *slp = ISDN_SLAVE_PRIV(lp); 840 if (slp->flags & ISDN_NET_CONNECTED) { 841 printk(KERN_INFO 842 "isdn_net: hang up slave %s before %s\n", 843 lp->slave->name, d->name); 844 isdn_net_hangup(lp->slave); 845 } 846 } 847 printk(KERN_INFO "isdn_net: local hangup %s\n", d->name); 848#ifdef CONFIG_ISDN_PPP 849 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) 850 isdn_ppp_free(lp); 851#endif 852 isdn_net_lp_disconnected(lp); 853#ifdef CONFIG_ISDN_X25 854 /* try if there are generic encap protocol 855 receiver routines and signal the closure of 856 the link */ 857 if( pops && pops -> disconn_ind ) 858 pops -> disconn_ind(cprot); 859#endif /* CONFIG_ISDN_X25 */ 860 861 cmd.driver = lp->isdn_device; 862 cmd.command = ISDN_CMD_HANGUP; 863 cmd.arg = lp->isdn_channel; 864 isdn_command(&cmd); 865 printk(KERN_INFO "%s: Chargesum is %d\n", d->name, lp->charge); 866 isdn_all_eaz(lp->isdn_device, lp->isdn_channel); 867 } 868 isdn_net_unbind_channel(lp); 869} 870 871typedef struct { 872 __be16 source; 873 __be16 dest; 874} ip_ports; 875 876static void 877isdn_net_log_skb(struct sk_buff * skb, isdn_net_local * lp) 878{ 879 /* hopefully, this was set correctly */ 880 const u_char *p = skb_network_header(skb); 881 unsigned short proto = ntohs(skb->protocol); 882 int data_ofs; 883 ip_ports *ipp; 884 char addinfo[100]; 885 886 addinfo[0] = '\0'; 887 /* This check stolen from 2.1.72 dev_queue_xmit_nit() */ 888 if (p < skb->data || skb->network_header >= skb->tail) { 889 /* fall back to old isdn_net_log_packet method() */ 890 char * buf = skb->data; 891 892 printk(KERN_DEBUG "isdn_net: protocol %04x is buggy, dev %s\n", skb->protocol, lp->netdev->dev->name); 893 p = buf; 894 proto = ETH_P_IP; 895 switch (lp->p_encap) { 896 case ISDN_NET_ENCAP_IPTYP: 897 proto = ntohs(*(__be16 *)&buf[0]); 898 p = &buf[2]; 899 break; 900 case ISDN_NET_ENCAP_ETHER: 901 proto = ntohs(*(__be16 *)&buf[12]); 902 p = &buf[14]; 903 break; 904 case ISDN_NET_ENCAP_CISCOHDLC: 905 proto = ntohs(*(__be16 *)&buf[2]); 906 p = &buf[4]; 907 break; 908#ifdef CONFIG_ISDN_PPP 909 case ISDN_NET_ENCAP_SYNCPPP: 910 proto = ntohs(skb->protocol); 911 p = &buf[IPPP_MAX_HEADER]; 912 break; 913#endif 914 } 915 } 916 data_ofs = ((p[0] & 15) * 4); 917 switch (proto) { 918 case ETH_P_IP: 919 switch (p[9]) { 920 case 1: 921 strcpy(addinfo, " ICMP"); 922 break; 923 case 2: 924 strcpy(addinfo, " IGMP"); 925 break; 926 case 4: 927 strcpy(addinfo, " IPIP"); 928 break; 929 case 6: 930 ipp = (ip_ports *) (&p[data_ofs]); 931 sprintf(addinfo, " TCP, port: %d -> %d", ntohs(ipp->source), 932 ntohs(ipp->dest)); 933 break; 934 case 8: 935 strcpy(addinfo, " EGP"); 936 break; 937 case 12: 938 strcpy(addinfo, " PUP"); 939 break; 940 case 17: 941 ipp = (ip_ports *) (&p[data_ofs]); 942 sprintf(addinfo, " UDP, port: %d -> %d", ntohs(ipp->source), 943 ntohs(ipp->dest)); 944 break; 945 case 22: 946 strcpy(addinfo, " IDP"); 947 break; 948 } 949 printk(KERN_INFO "OPEN: %pI4 -> %pI4%s\n", 950 p + 12, p + 16, addinfo); 951 break; 952 case ETH_P_ARP: 953 printk(KERN_INFO "OPEN: ARP %pI4 -> *.*.*.* ?%pI4\n", 954 p + 14, p + 24); 955 break; 956 } 957} 958 959/* 960 * this function is used to send supervisory data, i.e. data which was 961 * not received from the network layer, but e.g. frames from ipppd, CCP 962 * reset frames etc. 963 */ 964void isdn_net_write_super(isdn_net_local *lp, struct sk_buff *skb) 965{ 966 if (in_irq()) { 967 // we can't grab the lock from irq context, 968 // so we just queue the packet 969 skb_queue_tail(&lp->super_tx_queue, skb); 970 schedule_work(&lp->tqueue); 971 return; 972 } 973 974 spin_lock_bh(&lp->xmit_lock); 975 if (!isdn_net_lp_busy(lp)) { 976 isdn_net_writebuf_skb(lp, skb); 977 } else { 978 skb_queue_tail(&lp->super_tx_queue, skb); 979 } 980 spin_unlock_bh(&lp->xmit_lock); 981} 982 983/* 984 * called from tq_immediate 985 */ 986static void isdn_net_softint(struct work_struct *work) 987{ 988 isdn_net_local *lp = container_of(work, isdn_net_local, tqueue); 989 struct sk_buff *skb; 990 991 spin_lock_bh(&lp->xmit_lock); 992 while (!isdn_net_lp_busy(lp)) { 993 skb = skb_dequeue(&lp->super_tx_queue); 994 if (!skb) 995 break; 996 isdn_net_writebuf_skb(lp, skb); 997 } 998 spin_unlock_bh(&lp->xmit_lock); 999} 1000 1001/* 1002 * all frames sent from the (net) LL to a HL driver should go via this function 1003 * it's serialized by the caller holding the lp->xmit_lock spinlock 1004 */ 1005void isdn_net_writebuf_skb(isdn_net_local *lp, struct sk_buff *skb) 1006{ 1007 int ret; 1008 int len = skb->len; /* save len */ 1009 1010 /* before obtaining the lock the caller should have checked that 1011 the lp isn't busy */ 1012 if (isdn_net_lp_busy(lp)) { 1013 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__); 1014 goto error; 1015 } 1016 1017 if (!(lp->flags & ISDN_NET_CONNECTED)) { 1018 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__); 1019 goto error; 1020 } 1021 ret = isdn_writebuf_skb_stub(lp->isdn_device, lp->isdn_channel, 1, skb); 1022 if (ret != len) { 1023 /* we should never get here */ 1024 printk(KERN_WARNING "%s: HL driver queue full\n", lp->netdev->dev->name); 1025 goto error; 1026 } 1027 1028 lp->transcount += len; 1029 isdn_net_inc_frame_cnt(lp); 1030 return; 1031 1032 error: 1033 dev_kfree_skb(skb); 1034 lp->stats.tx_errors++; 1035 1036} 1037 1038 1039/* 1040 * Helper function for isdn_net_start_xmit. 1041 * When called, the connection is already established. 1042 * Based on cps-calculation, check if device is overloaded. 1043 * If so, and if a slave exists, trigger dialing for it. 1044 * If any slave is online, deliver packets using a simple round robin 1045 * scheme. 1046 * 1047 * Return: 0 on success, !0 on failure. 1048 */ 1049 1050static int 1051isdn_net_xmit(struct net_device *ndev, struct sk_buff *skb) 1052{ 1053 isdn_net_dev *nd; 1054 isdn_net_local *slp; 1055 isdn_net_local *lp = netdev_priv(ndev); 1056 int retv = NETDEV_TX_OK; 1057 1058 if (((isdn_net_local *) netdev_priv(ndev))->master) { 1059 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__); 1060 dev_kfree_skb(skb); 1061 return NETDEV_TX_OK; 1062 } 1063 1064 /* For the other encaps the header has already been built */ 1065#ifdef CONFIG_ISDN_PPP 1066 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) { 1067 return isdn_ppp_xmit(skb, ndev); 1068 } 1069#endif 1070 nd = ((isdn_net_local *) netdev_priv(ndev))->netdev; 1071 lp = isdn_net_get_locked_lp(nd); 1072 if (!lp) { 1073 printk(KERN_WARNING "%s: all channels busy - requeuing!\n", ndev->name); 1074 return NETDEV_TX_BUSY; 1075 } 1076 /* we have our lp locked from now on */ 1077 1078 /* Reset hangup-timeout */ 1079 lp->huptimer = 0; // FIXME? 1080 isdn_net_writebuf_skb(lp, skb); 1081 spin_unlock_bh(&lp->xmit_lock); 1082 1083 /* the following stuff is here for backwards compatibility. 1084 * in future, start-up and hangup of slaves (based on current load) 1085 * should move to userspace and get based on an overall cps 1086 * calculation 1087 */ 1088 if (lp->cps > lp->triggercps) { 1089 if (lp->slave) { 1090 if (!lp->sqfull) { 1091 /* First time overload: set timestamp only */ 1092 lp->sqfull = 1; 1093 lp->sqfull_stamp = jiffies; 1094 } else { 1095 /* subsequent overload: if slavedelay exceeded, start dialing */ 1096 if (time_after(jiffies, lp->sqfull_stamp + lp->slavedelay)) { 1097 slp = ISDN_SLAVE_PRIV(lp); 1098 if (!(slp->flags & ISDN_NET_CONNECTED)) { 1099 isdn_net_force_dial_lp(ISDN_SLAVE_PRIV(lp)); 1100 } 1101 } 1102 } 1103 } 1104 } else { 1105 if (lp->sqfull && time_after(jiffies, lp->sqfull_stamp + lp->slavedelay + (10 * HZ))) { 1106 lp->sqfull = 0; 1107 } 1108 /* this is a hack to allow auto-hangup for slaves on moderate loads */ 1109 nd->queue = nd->local; 1110 } 1111 1112 return retv; 1113 1114} 1115 1116static void 1117isdn_net_adjust_hdr(struct sk_buff *skb, struct net_device *dev) 1118{ 1119 isdn_net_local *lp = netdev_priv(dev); 1120 if (!skb) 1121 return; 1122 if (lp->p_encap == ISDN_NET_ENCAP_ETHER) { 1123 const int pullsize = skb_network_offset(skb) - ETH_HLEN; 1124 if (pullsize > 0) { 1125 printk(KERN_DEBUG "isdn_net: Pull junk %d\n", pullsize); 1126 skb_pull(skb, pullsize); 1127 } 1128 } 1129} 1130 1131 1132static void isdn_net_tx_timeout(struct net_device * ndev) 1133{ 1134 isdn_net_local *lp = netdev_priv(ndev); 1135 1136 printk(KERN_WARNING "isdn_tx_timeout dev %s dialstate %d\n", ndev->name, lp->dialstate); 1137 if (!lp->dialstate){ 1138 lp->stats.tx_errors++; 1139 /* 1140 * There is a certain probability that this currently 1141 * works at all because if we always wake up the interface, 1142 * then upper layer will try to send the next packet 1143 * immediately. And then, the old clean_up logic in the 1144 * driver will hopefully continue to work as it used to do. 1145 * 1146 * This is rather primitive right know, we better should 1147 * clean internal queues here, in particular for multilink and 1148 * ppp, and reset HL driver's channel, too. --HE 1149 * 1150 * actually, this may not matter at all, because ISDN hardware 1151 * should not see transmitter hangs at all IMO 1152 * changed KERN_DEBUG to KERN_WARNING to find out if this is 1153 * ever called --KG 1154 */ 1155 } 1156 ndev->trans_start = jiffies; 1157 netif_wake_queue(ndev); 1158} 1159 1160/* 1161 * Try sending a packet. 1162 * If this interface isn't connected to a ISDN-Channel, find a free channel, 1163 * and start dialing. 1164 */ 1165static netdev_tx_t 1166isdn_net_start_xmit(struct sk_buff *skb, struct net_device *ndev) 1167{ 1168 isdn_net_local *lp = netdev_priv(ndev); 1169#ifdef CONFIG_ISDN_X25 1170 struct concap_proto * cprot = lp -> netdev -> cprot; 1171/* At this point hard_start_xmit() passes control to the encapsulation 1172 protocol (if present). 1173 For X.25 auto-dialing is completly bypassed because: 1174 - It does not conform with the semantics of a reliable datalink 1175 service as needed by X.25 PLP. 1176 - I don't want that the interface starts dialing when the network layer 1177 sends a message which requests to disconnect the lapb link (or if it 1178 sends any other message not resulting in data transmission). 1179 Instead, dialing will be initiated by the encapsulation protocol entity 1180 when a dl_establish request is received from the upper layer. 1181*/ 1182 if (cprot && cprot -> pops) { 1183 int ret = cprot -> pops -> encap_and_xmit ( cprot , skb); 1184 1185 if (ret) 1186 netif_stop_queue(ndev); 1187 return ret; 1188 } else 1189#endif 1190 /* auto-dialing xmit function */ 1191 { 1192#ifdef ISDN_DEBUG_NET_DUMP 1193 u_char *buf; 1194#endif 1195 isdn_net_adjust_hdr(skb, ndev); 1196#ifdef ISDN_DEBUG_NET_DUMP 1197 buf = skb->data; 1198 isdn_dumppkt("S:", buf, skb->len, 40); 1199#endif 1200 1201 if (!(lp->flags & ISDN_NET_CONNECTED)) { 1202 int chi; 1203 /* only do autodial if allowed by config */ 1204 if (!(ISDN_NET_DIALMODE(*lp) == ISDN_NET_DM_AUTO)) { 1205 isdn_net_unreachable(ndev, skb, "dial rejected: interface not in dialmode `auto'"); 1206 dev_kfree_skb(skb); 1207 return NETDEV_TX_OK; 1208 } 1209 if (lp->phone[1]) { 1210 ulong flags; 1211 1212 if(lp->dialwait_timer <= 0) 1213 if(lp->dialstarted > 0 && lp->dialtimeout > 0 && time_before(jiffies, lp->dialstarted + lp->dialtimeout + lp->dialwait)) 1214 lp->dialwait_timer = lp->dialstarted + lp->dialtimeout + lp->dialwait; 1215 1216 if(lp->dialwait_timer > 0) { 1217 if(time_before(jiffies, lp->dialwait_timer)) { 1218 isdn_net_unreachable(ndev, skb, "dial rejected: retry-time not reached"); 1219 dev_kfree_skb(skb); 1220 return NETDEV_TX_OK; 1221 } else 1222 lp->dialwait_timer = 0; 1223 } 1224 /* Grab a free ISDN-Channel */ 1225 spin_lock_irqsave(&dev->lock, flags); 1226 if (((chi = 1227 isdn_get_free_channel( 1228 ISDN_USAGE_NET, 1229 lp->l2_proto, 1230 lp->l3_proto, 1231 lp->pre_device, 1232 lp->pre_channel, 1233 lp->msn) 1234 ) < 0) && 1235 ((chi = 1236 isdn_get_free_channel( 1237 ISDN_USAGE_NET, 1238 lp->l2_proto, 1239 lp->l3_proto, 1240 lp->pre_device, 1241 lp->pre_channel^1, 1242 lp->msn) 1243 ) < 0)) { 1244 spin_unlock_irqrestore(&dev->lock, flags); 1245 isdn_net_unreachable(ndev, skb, 1246 "No channel"); 1247 dev_kfree_skb(skb); 1248 return NETDEV_TX_OK; 1249 } 1250 /* Log packet, which triggered dialing */ 1251 if (dev->net_verbose) 1252 isdn_net_log_skb(skb, lp); 1253 lp->dialstate = 1; 1254 /* Connect interface with channel */ 1255 isdn_net_bind_channel(lp, chi); 1256#ifdef CONFIG_ISDN_PPP 1257 if (lp->p_encap == ISDN_NET_ENCAP_SYNCPPP) { 1258 /* no 'first_skb' handling for syncPPP */ 1259 if (isdn_ppp_bind(lp) < 0) { 1260 dev_kfree_skb(skb); 1261 isdn_net_unbind_channel(lp); 1262 spin_unlock_irqrestore(&dev->lock, flags); 1263 return NETDEV_TX_OK; /* STN (skb to nirvana) ;) */ 1264 } 1265#ifdef CONFIG_IPPP_FILTER 1266 if (isdn_ppp_autodial_filter(skb, lp)) { 1267 isdn_ppp_free(lp); 1268 isdn_net_unbind_channel(lp); 1269 spin_unlock_irqrestore(&dev->lock, flags); 1270 isdn_net_unreachable(ndev, skb, "dial rejected: packet filtered"); 1271 dev_kfree_skb(skb); 1272 return NETDEV_TX_OK; 1273 } 1274#endif 1275 spin_unlock_irqrestore(&dev->lock, flags); 1276 isdn_net_dial(); /* Initiate dialing */ 1277 netif_stop_queue(ndev); 1278 return NETDEV_TX_BUSY; /* let upper layer requeue skb packet */ 1279 } 1280#endif 1281 /* Initiate dialing */ 1282 spin_unlock_irqrestore(&dev->lock, flags); 1283 isdn_net_dial(); 1284 isdn_net_device_stop_queue(lp); 1285 return NETDEV_TX_BUSY; 1286 } else { 1287 isdn_net_unreachable(ndev, skb, 1288 "No phone number"); 1289 dev_kfree_skb(skb); 1290 return NETDEV_TX_OK; 1291 } 1292 } else { 1293 /* Device is connected to an ISDN channel */ 1294 ndev->trans_start = jiffies; 1295 if (!lp->dialstate) { 1296 /* ISDN connection is established, try sending */ 1297 int ret; 1298 ret = (isdn_net_xmit(ndev, skb)); 1299 if(ret) netif_stop_queue(ndev); 1300 return ret; 1301 } else 1302 netif_stop_queue(ndev); 1303 } 1304 } 1305 return NETDEV_TX_BUSY; 1306} 1307 1308/* 1309 * Shutdown a net-interface. 1310 */ 1311static int 1312isdn_net_close(struct net_device *dev) 1313{ 1314 struct net_device *p; 1315#ifdef CONFIG_ISDN_X25 1316 struct concap_proto * cprot = 1317 ((isdn_net_local *) netdev_priv(dev))->netdev->cprot; 1318 /* printk(KERN_DEBUG "isdn_net_close %s\n" , dev-> name ); */ 1319#endif 1320 1321#ifdef CONFIG_ISDN_X25 1322 if( cprot && cprot -> pops ) cprot -> pops -> close( cprot ); 1323#endif 1324 netif_stop_queue(dev); 1325 p = MASTER_TO_SLAVE(dev); 1326 if (p) { 1327 /* If this interface has slaves, stop them also */ 1328 while (p) { 1329#ifdef CONFIG_ISDN_X25 1330 cprot = ((isdn_net_local *) netdev_priv(p)) 1331 -> netdev -> cprot; 1332 if( cprot && cprot -> pops ) 1333 cprot -> pops -> close( cprot ); 1334#endif 1335 isdn_net_hangup(p); 1336 p = MASTER_TO_SLAVE(p); 1337 } 1338 } 1339 isdn_net_hangup(dev); 1340 isdn_unlock_drivers(); 1341 return 0; 1342} 1343 1344/* 1345 * Get statistics 1346 */ 1347static struct net_device_stats * 1348isdn_net_get_stats(struct net_device *dev) 1349{ 1350 isdn_net_local *lp = netdev_priv(dev); 1351 return &lp->stats; 1352} 1353 1354/* This is simply a copy from std. eth.c EXCEPT we pull ETH_HLEN 1355 * instead of dev->hard_header_len off. This is done because the 1356 * lowlevel-driver has already pulled off its stuff when we get 1357 * here and this routine only gets called with p_encap == ETHER. 1358 * Determine the packet's protocol ID. The rule here is that we 1359 * assume 802.3 if the type field is short enough to be a length. 1360 * This is normal practice and works for any 'now in use' protocol. 1361 */ 1362 1363static __be16 1364isdn_net_type_trans(struct sk_buff *skb, struct net_device *dev) 1365{ 1366 struct ethhdr *eth; 1367 unsigned char *rawp; 1368 1369 skb_reset_mac_header(skb); 1370 skb_pull(skb, ETH_HLEN); 1371 eth = eth_hdr(skb); 1372 1373 if (*eth->h_dest & 1) { 1374 if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN) == 0) 1375 skb->pkt_type = PACKET_BROADCAST; 1376 else 1377 skb->pkt_type = PACKET_MULTICAST; 1378 } 1379 /* 1380 * This ALLMULTI check should be redundant by 1.4 1381 * so don't forget to remove it. 1382 */ 1383 1384 else if (dev->flags & (IFF_PROMISC /*| IFF_ALLMULTI*/)) { 1385 if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN)) 1386 skb->pkt_type = PACKET_OTHERHOST; 1387 } 1388 if (ntohs(eth->h_proto) >= 1536) 1389 return eth->h_proto; 1390 1391 rawp = skb->data; 1392 1393 /* 1394 * This is a magic hack to spot IPX packets. Older Novell breaks 1395 * the protocol design and runs IPX over 802.3 without an 802.2 LLC 1396 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This 1397 * won't work for fault tolerant netware but does for the rest. 1398 */ 1399 if (*(unsigned short *) rawp == 0xFFFF) 1400 return htons(ETH_P_802_3); 1401 /* 1402 * Real 802.2 LLC 1403 */ 1404 return htons(ETH_P_802_2); 1405} 1406 1407 1408/* 1409 * CISCO HDLC keepalive specific stuff 1410 */ 1411static struct sk_buff* 1412isdn_net_ciscohdlck_alloc_skb(isdn_net_local *lp, int len) 1413{ 1414 unsigned short hl = dev->drv[lp->isdn_device]->interface->hl_hdrlen; 1415 struct sk_buff *skb; 1416 1417 skb = alloc_skb(hl + len, GFP_ATOMIC); 1418 if (skb) 1419 skb_reserve(skb, hl); 1420 else 1421 printk("isdn out of mem at %s:%d!\n", __FILE__, __LINE__); 1422 return skb; 1423} 1424 1425/* cisco hdlck device private ioctls */ 1426static int 1427isdn_ciscohdlck_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 1428{ 1429 isdn_net_local *lp = netdev_priv(dev); 1430 unsigned long len = 0; 1431 unsigned long expires = 0; 1432 int tmp = 0; 1433 int period = lp->cisco_keepalive_period; 1434 s8 debserint = lp->cisco_debserint; 1435 int rc = 0; 1436 1437 if (lp->p_encap != ISDN_NET_ENCAP_CISCOHDLCK) 1438 return -EINVAL; 1439 1440 switch (cmd) { 1441 /* get/set keepalive period */ 1442 case SIOCGKEEPPERIOD: 1443 len = (unsigned long)sizeof(lp->cisco_keepalive_period); 1444 if (copy_to_user(ifr->ifr_data, 1445 &lp->cisco_keepalive_period, len)) 1446 rc = -EFAULT; 1447 break; 1448 case SIOCSKEEPPERIOD: 1449 tmp = lp->cisco_keepalive_period; 1450 len = (unsigned long)sizeof(lp->cisco_keepalive_period); 1451 if (copy_from_user(&period, ifr->ifr_data, len)) 1452 rc = -EFAULT; 1453 if ((period > 0) && (period <= 32767)) 1454 lp->cisco_keepalive_period = period; 1455 else 1456 rc = -EINVAL; 1457 if (!rc && (tmp != lp->cisco_keepalive_period)) { 1458 expires = (unsigned long)(jiffies + 1459 lp->cisco_keepalive_period * HZ); 1460 mod_timer(&lp->cisco_timer, expires); 1461 printk(KERN_INFO "%s: Keepalive period set " 1462 "to %d seconds.\n", 1463 dev->name, lp->cisco_keepalive_period); 1464 } 1465 break; 1466 1467 /* get/set debugging */ 1468 case SIOCGDEBSERINT: 1469 len = (unsigned long)sizeof(lp->cisco_debserint); 1470 if (copy_to_user(ifr->ifr_data, 1471 &lp->cisco_debserint, len)) 1472 rc = -EFAULT; 1473 break; 1474 case SIOCSDEBSERINT: 1475 len = (unsigned long)sizeof(lp->cisco_debserint); 1476 if (copy_from_user(&debserint, 1477 ifr->ifr_data, len)) 1478 rc = -EFAULT; 1479 if ((debserint >= 0) && (debserint <= 64)) 1480 lp->cisco_debserint = debserint; 1481 else 1482 rc = -EINVAL; 1483 break; 1484 1485 default: 1486 rc = -EINVAL; 1487 break; 1488 } 1489 return (rc); 1490} 1491 1492 1493static int isdn_net_ioctl(struct net_device *dev, 1494 struct ifreq *ifr, int cmd) 1495{ 1496 isdn_net_local *lp = netdev_priv(dev); 1497 1498 switch (lp->p_encap) { 1499#ifdef CONFIG_ISDN_PPP 1500 case ISDN_NET_ENCAP_SYNCPPP: 1501 return isdn_ppp_dev_ioctl(dev, ifr, cmd); 1502#endif 1503 case ISDN_NET_ENCAP_CISCOHDLCK: 1504 return isdn_ciscohdlck_dev_ioctl(dev, ifr, cmd); 1505 default: 1506 return -EINVAL; 1507 } 1508} 1509 1510/* called via cisco_timer.function */ 1511static void 1512isdn_net_ciscohdlck_slarp_send_keepalive(unsigned long data) 1513{ 1514 isdn_net_local *lp = (isdn_net_local *) data; 1515 struct sk_buff *skb; 1516 unsigned char *p; 1517 unsigned long last_cisco_myseq = lp->cisco_myseq; 1518 int myseq_diff = 0; 1519 1520 if (!(lp->flags & ISDN_NET_CONNECTED) || lp->dialstate) { 1521 printk("isdn BUG at %s:%d!\n", __FILE__, __LINE__); 1522 return; 1523 } 1524 lp->cisco_myseq++; 1525 1526 myseq_diff = (lp->cisco_myseq - lp->cisco_mineseen); 1527 if ((lp->cisco_line_state) && ((myseq_diff >= 3)||(myseq_diff <= -3))) { 1528 /* line up -> down */ 1529 lp->cisco_line_state = 0; 1530 printk (KERN_WARNING 1531 "UPDOWN: Line protocol on Interface %s," 1532 " changed state to down\n", lp->netdev->dev->name); 1533 /* should stop routing higher-level data across */ 1534 } else if ((!lp->cisco_line_state) && 1535 (myseq_diff >= 0) && (myseq_diff <= 2)) { 1536 /* line down -> up */ 1537 lp->cisco_line_state = 1; 1538 printk (KERN_WARNING 1539 "UPDOWN: Line protocol on Interface %s," 1540 " changed state to up\n", lp->netdev->dev->name); 1541 /* restart routing higher-level data across */ 1542 } 1543 1544 if (lp->cisco_debserint) 1545 printk (KERN_DEBUG "%s: HDLC " 1546 "myseq %lu, mineseen %lu%c, yourseen %lu, %s\n", 1547 lp->netdev->dev->name, last_cisco_myseq, lp->cisco_mineseen, 1548 ((last_cisco_myseq == lp->cisco_mineseen) ? '*' : 040), 1549 lp->cisco_yourseq, 1550 ((lp->cisco_line_state) ? "line up" : "line down")); 1551 1552 skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14); 1553 if (!skb) 1554 return; 1555 1556 p = skb_put(skb, 4 + 14); 1557 1558 /* cisco header */ 1559 *(u8 *)(p + 0) = CISCO_ADDR_UNICAST; 1560 *(u8 *)(p + 1) = CISCO_CTRL; 1561 *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP); 1562 1563 /* slarp keepalive */ 1564 *(__be32 *)(p + 4) = cpu_to_be32(CISCO_SLARP_KEEPALIVE); 1565 *(__be32 *)(p + 8) = cpu_to_be32(lp->cisco_myseq); 1566 *(__be32 *)(p + 12) = cpu_to_be32(lp->cisco_yourseq); 1567 *(__be16 *)(p + 16) = cpu_to_be16(0xffff); // reliability, always 0xffff 1568 p += 18; 1569 1570 isdn_net_write_super(lp, skb); 1571 1572 lp->cisco_timer.expires = jiffies + lp->cisco_keepalive_period * HZ; 1573 1574 add_timer(&lp->cisco_timer); 1575} 1576 1577static void 1578isdn_net_ciscohdlck_slarp_send_request(isdn_net_local *lp) 1579{ 1580 struct sk_buff *skb; 1581 unsigned char *p; 1582 1583 skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14); 1584 if (!skb) 1585 return; 1586 1587 p = skb_put(skb, 4 + 14); 1588 1589 /* cisco header */ 1590 *(u8 *)(p + 0) = CISCO_ADDR_UNICAST; 1591 *(u8 *)(p + 1) = CISCO_CTRL; 1592 *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP); 1593 1594 /* slarp request */ 1595 *(__be32 *)(p + 4) = cpu_to_be32(CISCO_SLARP_REQUEST); 1596 *(__be32 *)(p + 8) = cpu_to_be32(0); // address 1597 *(__be32 *)(p + 12) = cpu_to_be32(0); // netmask 1598 *(__be16 *)(p + 16) = cpu_to_be16(0); // unused 1599 p += 18; 1600 1601 isdn_net_write_super(lp, skb); 1602} 1603 1604static void 1605isdn_net_ciscohdlck_connected(isdn_net_local *lp) 1606{ 1607 lp->cisco_myseq = 0; 1608 lp->cisco_mineseen = 0; 1609 lp->cisco_yourseq = 0; 1610 lp->cisco_keepalive_period = ISDN_TIMER_KEEPINT; 1611 lp->cisco_last_slarp_in = 0; 1612 lp->cisco_line_state = 0; 1613 lp->cisco_debserint = 0; 1614 1615 /* send slarp request because interface/seq.no.s reset */ 1616 isdn_net_ciscohdlck_slarp_send_request(lp); 1617 1618 init_timer(&lp->cisco_timer); 1619 lp->cisco_timer.data = (unsigned long) lp; 1620 lp->cisco_timer.function = isdn_net_ciscohdlck_slarp_send_keepalive; 1621 lp->cisco_timer.expires = jiffies + lp->cisco_keepalive_period * HZ; 1622 add_timer(&lp->cisco_timer); 1623} 1624 1625static void 1626isdn_net_ciscohdlck_disconnected(isdn_net_local *lp) 1627{ 1628 del_timer(&lp->cisco_timer); 1629} 1630 1631static void 1632isdn_net_ciscohdlck_slarp_send_reply(isdn_net_local *lp) 1633{ 1634 struct sk_buff *skb; 1635 unsigned char *p; 1636 struct in_device *in_dev = NULL; 1637 __be32 addr = 0; /* local ipv4 address */ 1638 __be32 mask = 0; /* local netmask */ 1639 1640 if ((in_dev = lp->netdev->dev->ip_ptr) != NULL) { 1641 /* take primary(first) address of interface */ 1642 struct in_ifaddr *ifa = in_dev->ifa_list; 1643 if (ifa != NULL) { 1644 addr = ifa->ifa_local; 1645 mask = ifa->ifa_mask; 1646 } 1647 } 1648 1649 skb = isdn_net_ciscohdlck_alloc_skb(lp, 4 + 14); 1650 if (!skb) 1651 return; 1652 1653 p = skb_put(skb, 4 + 14); 1654 1655 /* cisco header */ 1656 *(u8 *)(p + 0) = CISCO_ADDR_UNICAST; 1657 *(u8 *)(p + 1) = CISCO_CTRL; 1658 *(__be16 *)(p + 2) = cpu_to_be16(CISCO_TYPE_SLARP); 1659 1660 /* slarp reply, send own ip/netmask; if values are nonsense remote 1661 * should think we are unable to provide it with an address via SLARP */ 1662 *(__be32 *)(p + 4) = cpu_to_be32(CISCO_SLARP_REPLY); 1663 *(__be32 *)(p + 8) = addr; // address 1664 *(__be32 *)(p + 12) = mask; // netmask 1665 *(__be16 *)(p + 16) = cpu_to_be16(0); // unused 1666 p += 18; 1667 1668 isdn_net_write_super(lp, skb); 1669} 1670 1671static void 1672isdn_net_ciscohdlck_slarp_in(isdn_net_local *lp, struct sk_buff *skb) 1673{ 1674 unsigned char *p; 1675 int period; 1676 u32 code; 1677 u32 my_seq; 1678 u32 your_seq; 1679 __be32 local; 1680 __be32 *addr, *mask; 1681 1682 if (skb->len < 14) 1683 return; 1684 1685 p = skb->data; 1686 code = be32_to_cpup((__be32 *)p); 1687 p += 4; 1688 1689 switch (code) { 1690 case CISCO_SLARP_REQUEST: 1691 lp->cisco_yourseq = 0; 1692 isdn_net_ciscohdlck_slarp_send_reply(lp); 1693 break; 1694 case CISCO_SLARP_REPLY: 1695 addr = (__be32 *)p; 1696 mask = (__be32 *)(p + 4); 1697 if (*mask != cpu_to_be32(0xfffffffc)) 1698 goto slarp_reply_out; 1699 if ((*addr & cpu_to_be32(3)) == cpu_to_be32(0) || 1700 (*addr & cpu_to_be32(3)) == cpu_to_be32(3)) 1701 goto slarp_reply_out; 1702 local = *addr ^ cpu_to_be32(3); 1703 printk(KERN_INFO "%s: got slarp reply: remote ip: %pI4, local ip: %pI4 mask: %pI4\n", 1704 lp->netdev->dev->name, addr, &local, mask); 1705 break; 1706 slarp_reply_out: 1707 printk(KERN_INFO "%s: got invalid slarp reply (%pI4/%pI4) - ignored\n", 1708 lp->netdev->dev->name, addr, mask); 1709 break; 1710 case CISCO_SLARP_KEEPALIVE: 1711 period = (int)((jiffies - lp->cisco_last_slarp_in 1712 + HZ/2 - 1) / HZ); 1713 if (lp->cisco_debserint && 1714 (period != lp->cisco_keepalive_period) && 1715 lp->cisco_last_slarp_in) { 1716 printk(KERN_DEBUG "%s: Keepalive period mismatch - " 1717 "is %d but should be %d.\n", 1718 lp->netdev->dev->name, period, 1719 lp->cisco_keepalive_period); 1720 } 1721 lp->cisco_last_slarp_in = jiffies; 1722 my_seq = be32_to_cpup((__be32 *)(p + 0)); 1723 your_seq = be32_to_cpup((__be32 *)(p + 4)); 1724 p += 10; 1725 lp->cisco_yourseq = my_seq; 1726 lp->cisco_mineseen = your_seq; 1727 break; 1728 } 1729} 1730 1731static void 1732isdn_net_ciscohdlck_receive(isdn_net_local *lp, struct sk_buff *skb) 1733{ 1734 unsigned char *p; 1735 u8 addr; 1736 u8 ctrl; 1737 u16 type; 1738 1739 if (skb->len < 4) 1740 goto out_free; 1741 1742 p = skb->data; 1743 addr = *(u8 *)(p + 0); 1744 ctrl = *(u8 *)(p + 1); 1745 type = be16_to_cpup((__be16 *)(p + 2)); 1746 p += 4; 1747 skb_pull(skb, 4); 1748 1749 if (addr != CISCO_ADDR_UNICAST && addr != CISCO_ADDR_BROADCAST) { 1750 printk(KERN_WARNING "%s: Unknown Cisco addr 0x%02x\n", 1751 lp->netdev->dev->name, addr); 1752 goto out_free; 1753 } 1754 if (ctrl != CISCO_CTRL) { 1755 printk(KERN_WARNING "%s: Unknown Cisco ctrl 0x%02x\n", 1756 lp->netdev->dev->name, ctrl); 1757 goto out_free; 1758 } 1759 1760 switch (type) { 1761 case CISCO_TYPE_SLARP: 1762 isdn_net_ciscohdlck_slarp_in(lp, skb); 1763 goto out_free; 1764 case CISCO_TYPE_CDP: 1765 if (lp->cisco_debserint) 1766 printk(KERN_DEBUG "%s: Received CDP packet. use " 1767 "\"no cdp enable\" on cisco.\n", 1768 lp->netdev->dev->name); 1769 goto out_free; 1770 default: 1771 /* no special cisco protocol */ 1772 skb->protocol = htons(type); 1773 netif_rx(skb); 1774 return; 1775 } 1776 1777 out_free: 1778 kfree_skb(skb); 1779} 1780 1781/* 1782 * Got a packet from ISDN-Channel. 1783 */ 1784static void 1785isdn_net_receive(struct net_device *ndev, struct sk_buff *skb) 1786{ 1787 isdn_net_local *lp = netdev_priv(ndev); 1788 isdn_net_local *olp = lp; /* original 'lp' */ 1789#ifdef CONFIG_ISDN_X25 1790 struct concap_proto *cprot = lp -> netdev -> cprot; 1791#endif 1792 lp->transcount += skb->len; 1793 1794 lp->stats.rx_packets++; 1795 lp->stats.rx_bytes += skb->len; 1796 if (lp->master) { 1797 /* Bundling: If device is a slave-device, deliver to master, also 1798 * handle master's statistics and hangup-timeout 1799 */ 1800 ndev = lp->master; 1801 lp = netdev_priv(ndev); 1802 lp->stats.rx_packets++; 1803 lp->stats.rx_bytes += skb->len; 1804 } 1805 skb->dev = ndev; 1806 skb->pkt_type = P…
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