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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[deliverable/linux.git] / drivers / net / wan / syncppp.c
1 /*
2 * NET3: A (fairly minimal) implementation of synchronous PPP for Linux
3 * as well as a CISCO HDLC implementation. See the copyright
4 * message below for the original source.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the license, or (at your option) any later version.
10 *
11 * Note however. This code is also used in a different form by FreeBSD.
12 * Therefore when making any non OS specific change please consider
13 * contributing it back to the original author under the terms
14 * below in addition.
15 * -- Alan
16 *
17 * Port for Linux-2.1 by Jan "Yenya" Kasprzak <kas@fi.muni.cz>
18 */
19
20 /*
21 * Synchronous PPP/Cisco link level subroutines.
22 * Keepalive protocol implemented in both Cisco and PPP modes.
23 *
24 * Copyright (C) 1994 Cronyx Ltd.
25 * Author: Serge Vakulenko, <vak@zebub.msk.su>
26 *
27 * This software is distributed with NO WARRANTIES, not even the implied
28 * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
29 *
30 * Authors grant any other persons or organisations permission to use
31 * or modify this software as long as this message is kept with the software,
32 * all derivative works or modified versions.
33 *
34 * Version 1.9, Wed Oct 4 18:58:15 MSK 1995
35 *
36 * $Id: syncppp.c,v 1.18 2000/04/11 05:25:31 asj Exp $
37 */
38 #undef DEBUG
39
40 #include <linux/module.h>
41 #include <linux/kernel.h>
42 #include <linux/errno.h>
43 #include <linux/init.h>
44 #include <linux/if_arp.h>
45 #include <linux/skbuff.h>
46 #include <linux/route.h>
47 #include <linux/netdevice.h>
48 #include <linux/inetdevice.h>
49 #include <linux/random.h>
50 #include <linux/pkt_sched.h>
51 #include <linux/spinlock.h>
52 #include <linux/rcupdate.h>
53
54 #include <net/net_namespace.h>
55 #include <net/syncppp.h>
56
57 #include <asm/byteorder.h>
58 #include <asm/uaccess.h>
59
60 #define MAXALIVECNT 6 /* max. alive packets */
61
62 #define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
63 #define PPP_UI 0x03 /* Unnumbered Information */
64 #define PPP_IP 0x0021 /* Internet Protocol */
65 #define PPP_ISO 0x0023 /* ISO OSI Protocol */
66 #define PPP_XNS 0x0025 /* Xerox NS Protocol */
67 #define PPP_IPX 0x002b /* Novell IPX Protocol */
68 #define PPP_LCP 0xc021 /* Link Control Protocol */
69 #define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
70
71 #define LCP_CONF_REQ 1 /* PPP LCP configure request */
72 #define LCP_CONF_ACK 2 /* PPP LCP configure acknowledge */
73 #define LCP_CONF_NAK 3 /* PPP LCP configure negative ack */
74 #define LCP_CONF_REJ 4 /* PPP LCP configure reject */
75 #define LCP_TERM_REQ 5 /* PPP LCP terminate request */
76 #define LCP_TERM_ACK 6 /* PPP LCP terminate acknowledge */
77 #define LCP_CODE_REJ 7 /* PPP LCP code reject */
78 #define LCP_PROTO_REJ 8 /* PPP LCP protocol reject */
79 #define LCP_ECHO_REQ 9 /* PPP LCP echo request */
80 #define LCP_ECHO_REPLY 10 /* PPP LCP echo reply */
81 #define LCP_DISC_REQ 11 /* PPP LCP discard request */
82
83 #define LCP_OPT_MRU 1 /* maximum receive unit */
84 #define LCP_OPT_ASYNC_MAP 2 /* async control character map */
85 #define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
86 #define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
87 #define LCP_OPT_MAGIC 5 /* magic number */
88 #define LCP_OPT_RESERVED 6 /* reserved */
89 #define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
90 #define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
91
92 #define IPCP_CONF_REQ LCP_CONF_REQ /* PPP IPCP configure request */
93 #define IPCP_CONF_ACK LCP_CONF_ACK /* PPP IPCP configure acknowledge */
94 #define IPCP_CONF_NAK LCP_CONF_NAK /* PPP IPCP configure negative ack */
95 #define IPCP_CONF_REJ LCP_CONF_REJ /* PPP IPCP configure reject */
96 #define IPCP_TERM_REQ LCP_TERM_REQ /* PPP IPCP terminate request */
97 #define IPCP_TERM_ACK LCP_TERM_ACK /* PPP IPCP terminate acknowledge */
98 #define IPCP_CODE_REJ LCP_CODE_REJ /* PPP IPCP code reject */
99
100 #define CISCO_MULTICAST 0x8f /* Cisco multicast address */
101 #define CISCO_UNICAST 0x0f /* Cisco unicast address */
102 #define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
103 #define CISCO_ADDR_REQ 0 /* Cisco address request */
104 #define CISCO_ADDR_REPLY 1 /* Cisco address reply */
105 #define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
106
107 struct ppp_header {
108 u8 address;
109 u8 control;
110 __be16 protocol;
111 };
112 #define PPP_HEADER_LEN sizeof (struct ppp_header)
113
114 struct lcp_header {
115 u8 type;
116 u8 ident;
117 __be16 len;
118 };
119 #define LCP_HEADER_LEN sizeof (struct lcp_header)
120
121 struct cisco_packet {
122 __be32 type;
123 __be32 par1;
124 __be32 par2;
125 __be16 rel;
126 __be16 time0;
127 __be16 time1;
128 };
129 #define CISCO_PACKET_LEN 18
130 #define CISCO_BIG_PACKET_LEN 20
131
132 static struct sppp *spppq;
133 static struct timer_list sppp_keepalive_timer;
134 static DEFINE_SPINLOCK(spppq_lock);
135
136 /* global xmit queue for sending packets while spinlock is held */
137 static struct sk_buff_head tx_queue;
138
139 static void sppp_keepalive (unsigned long dummy);
140 static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
141 u8 ident, u16 len, void *data);
142 static void sppp_cisco_send (struct sppp *sp, int type, u32 par1, u32 par2);
143 static void sppp_lcp_input (struct sppp *sp, struct sk_buff *m);
144 static void sppp_cisco_input (struct sppp *sp, struct sk_buff *m);
145 static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *m);
146 static void sppp_lcp_open (struct sppp *sp);
147 static void sppp_ipcp_open (struct sppp *sp);
148 static int sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
149 int len, u32 *magic);
150 static void sppp_cp_timeout (unsigned long arg);
151 static char *sppp_lcp_type_name (u8 type);
152 static char *sppp_ipcp_type_name (u8 type);
153 static void sppp_print_bytes (u8 *p, u16 len);
154
155 static int debug;
156
157 /* Flush global outgoing packet queue to dev_queue_xmit().
158 *
159 * dev_queue_xmit() must be called with interrupts enabled
160 * which means it can't be called with spinlocks held.
161 * If a packet needs to be sent while a spinlock is held,
162 * then put the packet into tx_queue, and call sppp_flush_xmit()
163 * after spinlock is released.
164 */
165 static void sppp_flush_xmit(void)
166 {
167 struct sk_buff *skb;
168 while ((skb = skb_dequeue(&tx_queue)) != NULL)
169 dev_queue_xmit(skb);
170 }
171
172 /*
173 * Interface down stub
174 */
175
176 static void if_down(struct net_device *dev)
177 {
178 struct sppp *sp = (struct sppp *)sppp_of(dev);
179
180 sp->pp_link_state=SPPP_LINK_DOWN;
181 }
182
183 /*
184 * Timeout routine activations.
185 */
186
187 static void sppp_set_timeout(struct sppp *p,int s)
188 {
189 if (! (p->pp_flags & PP_TIMO))
190 {
191 init_timer(&p->pp_timer);
192 p->pp_timer.function=sppp_cp_timeout;
193 p->pp_timer.expires=jiffies+s*HZ;
194 p->pp_timer.data=(unsigned long)p;
195 p->pp_flags |= PP_TIMO;
196 add_timer(&p->pp_timer);
197 }
198 }
199
200 static void sppp_clear_timeout(struct sppp *p)
201 {
202 if (p->pp_flags & PP_TIMO)
203 {
204 del_timer(&p->pp_timer);
205 p->pp_flags &= ~PP_TIMO;
206 }
207 }
208
209 /**
210 * sppp_input - receive and process a WAN PPP frame
211 * @skb: The buffer to process
212 * @dev: The device it arrived on
213 *
214 * This can be called directly by cards that do not have
215 * timing constraints but is normally called from the network layer
216 * after interrupt servicing to process frames queued via netif_rx().
217 *
218 * We process the options in the card. If the frame is destined for
219 * the protocol stacks then it requeues the frame for the upper level
220 * protocol. If it is a control from it is processed and discarded
221 * here.
222 */
223
224 static void sppp_input (struct net_device *dev, struct sk_buff *skb)
225 {
226 struct ppp_header *h;
227 struct sppp *sp = (struct sppp *)sppp_of(dev);
228 unsigned long flags;
229
230 skb->dev=dev;
231 skb_reset_mac_header(skb);
232
233 if (!pskb_may_pull(skb, PPP_HEADER_LEN)) {
234 /* Too small packet, drop it. */
235 if (sp->pp_flags & PP_DEBUG)
236 printk (KERN_DEBUG "%s: input packet is too small, %d bytes\n",
237 dev->name, skb->len);
238 kfree_skb(skb);
239 return;
240 }
241
242 /* Get PPP header. */
243 h = (struct ppp_header *)skb->data;
244 skb_pull(skb,sizeof(struct ppp_header));
245
246 spin_lock_irqsave(&sp->lock, flags);
247
248 switch (h->address) {
249 default: /* Invalid PPP packet. */
250 goto invalid;
251 case PPP_ALLSTATIONS:
252 if (h->control != PPP_UI)
253 goto invalid;
254 if (sp->pp_flags & PP_CISCO) {
255 if (sp->pp_flags & PP_DEBUG)
256 printk (KERN_WARNING "%s: PPP packet in Cisco mode <0x%x 0x%x 0x%x>\n",
257 dev->name,
258 h->address, h->control, ntohs (h->protocol));
259 goto drop;
260 }
261 switch (ntohs (h->protocol)) {
262 default:
263 if (sp->lcp.state == LCP_STATE_OPENED)
264 sppp_cp_send (sp, PPP_LCP, LCP_PROTO_REJ,
265 ++sp->pp_seq, skb->len + 2,
266 &h->protocol);
267 if (sp->pp_flags & PP_DEBUG)
268 printk (KERN_WARNING "%s: invalid input protocol <0x%x 0x%x 0x%x>\n",
269 dev->name,
270 h->address, h->control, ntohs (h->protocol));
271 goto drop;
272 case PPP_LCP:
273 sppp_lcp_input (sp, skb);
274 goto drop;
275 case PPP_IPCP:
276 if (sp->lcp.state == LCP_STATE_OPENED)
277 sppp_ipcp_input (sp, skb);
278 else
279 printk(KERN_DEBUG "IPCP when still waiting LCP finish.\n");
280 goto drop;
281 case PPP_IP:
282 if (sp->ipcp.state == IPCP_STATE_OPENED) {
283 if(sp->pp_flags&PP_DEBUG)
284 printk(KERN_DEBUG "Yow an IP frame.\n");
285 skb->protocol=htons(ETH_P_IP);
286 netif_rx(skb);
287 dev->last_rx = jiffies;
288 goto done;
289 }
290 break;
291 #ifdef IPX
292 case PPP_IPX:
293 /* IPX IPXCP not implemented yet */
294 if (sp->lcp.state == LCP_STATE_OPENED) {
295 skb->protocol=htons(ETH_P_IPX);
296 netif_rx(skb);
297 dev->last_rx = jiffies;
298 goto done;
299 }
300 break;
301 #endif
302 }
303 break;
304 case CISCO_MULTICAST:
305 case CISCO_UNICAST:
306 /* Don't check the control field here (RFC 1547). */
307 if (! (sp->pp_flags & PP_CISCO)) {
308 if (sp->pp_flags & PP_DEBUG)
309 printk (KERN_WARNING "%s: Cisco packet in PPP mode <0x%x 0x%x 0x%x>\n",
310 dev->name,
311 h->address, h->control, ntohs (h->protocol));
312 goto drop;
313 }
314 switch (ntohs (h->protocol)) {
315 default:
316 goto invalid;
317 case CISCO_KEEPALIVE:
318 sppp_cisco_input (sp, skb);
319 goto drop;
320 #ifdef CONFIG_INET
321 case ETH_P_IP:
322 skb->protocol=htons(ETH_P_IP);
323 netif_rx(skb);
324 dev->last_rx = jiffies;
325 goto done;
326 #endif
327 #ifdef CONFIG_IPX
328 case ETH_P_IPX:
329 skb->protocol=htons(ETH_P_IPX);
330 netif_rx(skb);
331 dev->last_rx = jiffies;
332 goto done;
333 #endif
334 }
335 break;
336 }
337 goto drop;
338
339 invalid:
340 if (sp->pp_flags & PP_DEBUG)
341 printk (KERN_WARNING "%s: invalid input packet <0x%x 0x%x 0x%x>\n",
342 dev->name, h->address, h->control, ntohs (h->protocol));
343 drop:
344 kfree_skb(skb);
345 done:
346 spin_unlock_irqrestore(&sp->lock, flags);
347 sppp_flush_xmit();
348 return;
349 }
350
351 /*
352 * Handle transmit packets.
353 */
354
355 static int sppp_hard_header(struct sk_buff *skb,
356 struct net_device *dev, __u16 type,
357 const void *daddr, const void *saddr,
358 unsigned int len)
359 {
360 struct sppp *sp = (struct sppp *)sppp_of(dev);
361 struct ppp_header *h;
362 skb_push(skb,sizeof(struct ppp_header));
363 h=(struct ppp_header *)skb->data;
364 if(sp->pp_flags&PP_CISCO)
365 {
366 h->address = CISCO_UNICAST;
367 h->control = 0;
368 }
369 else
370 {
371 h->address = PPP_ALLSTATIONS;
372 h->control = PPP_UI;
373 }
374 if(sp->pp_flags & PP_CISCO)
375 {
376 h->protocol = htons(type);
377 }
378 else switch(type)
379 {
380 case ETH_P_IP:
381 h->protocol = htons(PPP_IP);
382 break;
383 case ETH_P_IPX:
384 h->protocol = htons(PPP_IPX);
385 break;
386 }
387 return sizeof(struct ppp_header);
388 }
389
390 static const struct header_ops sppp_header_ops = {
391 .create = sppp_hard_header,
392 };
393
394 /*
395 * Send keepalive packets, every 10 seconds.
396 */
397
398 static void sppp_keepalive (unsigned long dummy)
399 {
400 struct sppp *sp;
401 unsigned long flags;
402
403 spin_lock_irqsave(&spppq_lock, flags);
404
405 for (sp=spppq; sp; sp=sp->pp_next)
406 {
407 struct net_device *dev = sp->pp_if;
408
409 /* Keepalive mode disabled or channel down? */
410 if (! (sp->pp_flags & PP_KEEPALIVE) ||
411 ! (dev->flags & IFF_UP))
412 continue;
413
414 spin_lock(&sp->lock);
415
416 /* No keepalive in PPP mode if LCP not opened yet. */
417 if (! (sp->pp_flags & PP_CISCO) &&
418 sp->lcp.state != LCP_STATE_OPENED) {
419 spin_unlock(&sp->lock);
420 continue;
421 }
422
423 if (sp->pp_alivecnt == MAXALIVECNT) {
424 /* No keepalive packets got. Stop the interface. */
425 printk (KERN_WARNING "%s: protocol down\n", dev->name);
426 if_down (dev);
427 if (! (sp->pp_flags & PP_CISCO)) {
428 /* Shut down the PPP link. */
429 sp->lcp.magic = jiffies;
430 sp->lcp.state = LCP_STATE_CLOSED;
431 sp->ipcp.state = IPCP_STATE_CLOSED;
432 sppp_clear_timeout (sp);
433 /* Initiate negotiation. */
434 sppp_lcp_open (sp);
435 }
436 }
437 if (sp->pp_alivecnt <= MAXALIVECNT)
438 ++sp->pp_alivecnt;
439 if (sp->pp_flags & PP_CISCO)
440 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq,
441 sp->pp_rseq);
442 else if (sp->lcp.state == LCP_STATE_OPENED) {
443 __be32 nmagic = htonl (sp->lcp.magic);
444 sp->lcp.echoid = ++sp->pp_seq;
445 sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REQ,
446 sp->lcp.echoid, 4, &nmagic);
447 }
448
449 spin_unlock(&sp->lock);
450 }
451 spin_unlock_irqrestore(&spppq_lock, flags);
452 sppp_flush_xmit();
453 sppp_keepalive_timer.expires=jiffies+10*HZ;
454 add_timer(&sppp_keepalive_timer);
455 }
456
457 /*
458 * Handle incoming PPP Link Control Protocol packets.
459 */
460
461 static void sppp_lcp_input (struct sppp *sp, struct sk_buff *skb)
462 {
463 struct lcp_header *h;
464 struct net_device *dev = sp->pp_if;
465 int len = skb->len;
466 u8 *p, opt[6];
467 u32 rmagic = 0;
468
469 if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
470 if (sp->pp_flags & PP_DEBUG)
471 printk (KERN_WARNING "%s: invalid lcp packet length: %d bytes\n",
472 dev->name, len);
473 return;
474 }
475 h = (struct lcp_header *)skb->data;
476 skb_pull(skb,sizeof(struct lcp_header *));
477
478 if (sp->pp_flags & PP_DEBUG)
479 {
480 char state = '?';
481 switch (sp->lcp.state) {
482 case LCP_STATE_CLOSED: state = 'C'; break;
483 case LCP_STATE_ACK_RCVD: state = 'R'; break;
484 case LCP_STATE_ACK_SENT: state = 'S'; break;
485 case LCP_STATE_OPENED: state = 'O'; break;
486 }
487 printk (KERN_WARNING "%s: lcp input(%c): %d bytes <%s id=%xh len=%xh",
488 dev->name, state, len,
489 sppp_lcp_type_name (h->type), h->ident, ntohs (h->len));
490 if (len > 4)
491 sppp_print_bytes ((u8*) (h+1), len-4);
492 printk (">\n");
493 }
494 if (len > ntohs (h->len))
495 len = ntohs (h->len);
496 switch (h->type) {
497 default:
498 /* Unknown packet type -- send Code-Reject packet. */
499 sppp_cp_send (sp, PPP_LCP, LCP_CODE_REJ, ++sp->pp_seq,
500 skb->len, h);
501 break;
502 case LCP_CONF_REQ:
503 if (len < 4) {
504 if (sp->pp_flags & PP_DEBUG)
505 printk (KERN_DEBUG"%s: invalid lcp configure request packet length: %d bytes\n",
506 dev->name, len);
507 break;
508 }
509 if (len>4 && !sppp_lcp_conf_parse_options (sp, h, len, &rmagic))
510 goto badreq;
511 if (rmagic == sp->lcp.magic) {
512 /* Local and remote magics equal -- loopback? */
513 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
514 printk (KERN_WARNING "%s: loopback\n",
515 dev->name);
516 sp->pp_loopcnt = 0;
517 if (dev->flags & IFF_UP) {
518 if_down (dev);
519 }
520 } else if (sp->pp_flags & PP_DEBUG)
521 printk (KERN_DEBUG "%s: conf req: magic glitch\n",
522 dev->name);
523 ++sp->pp_loopcnt;
524
525 /* MUST send Conf-Nack packet. */
526 rmagic = ~sp->lcp.magic;
527 opt[0] = LCP_OPT_MAGIC;
528 opt[1] = sizeof (opt);
529 opt[2] = rmagic >> 24;
530 opt[3] = rmagic >> 16;
531 opt[4] = rmagic >> 8;
532 opt[5] = rmagic;
533 sppp_cp_send (sp, PPP_LCP, LCP_CONF_NAK,
534 h->ident, sizeof (opt), &opt);
535 badreq:
536 switch (sp->lcp.state) {
537 case LCP_STATE_OPENED:
538 /* Initiate renegotiation. */
539 sppp_lcp_open (sp);
540 /* fall through... */
541 case LCP_STATE_ACK_SENT:
542 /* Go to closed state. */
543 sp->lcp.state = LCP_STATE_CLOSED;
544 sp->ipcp.state = IPCP_STATE_CLOSED;
545 }
546 break;
547 }
548 /* Send Configure-Ack packet. */
549 sp->pp_loopcnt = 0;
550 if (sp->lcp.state != LCP_STATE_OPENED) {
551 sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
552 h->ident, len-4, h+1);
553 }
554 /* Change the state. */
555 switch (sp->lcp.state) {
556 case LCP_STATE_CLOSED:
557 sp->lcp.state = LCP_STATE_ACK_SENT;
558 break;
559 case LCP_STATE_ACK_RCVD:
560 sp->lcp.state = LCP_STATE_OPENED;
561 sppp_ipcp_open (sp);
562 break;
563 case LCP_STATE_OPENED:
564 /* Remote magic changed -- close session. */
565 sp->lcp.state = LCP_STATE_CLOSED;
566 sp->ipcp.state = IPCP_STATE_CLOSED;
567 /* Initiate renegotiation. */
568 sppp_lcp_open (sp);
569 /* Send ACK after our REQ in attempt to break loop */
570 sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
571 h->ident, len-4, h+1);
572 sp->lcp.state = LCP_STATE_ACK_SENT;
573 break;
574 }
575 break;
576 case LCP_CONF_ACK:
577 if (h->ident != sp->lcp.confid)
578 break;
579 sppp_clear_timeout (sp);
580 if ((sp->pp_link_state != SPPP_LINK_UP) &&
581 (dev->flags & IFF_UP)) {
582 /* Coming out of loopback mode. */
583 sp->pp_link_state=SPPP_LINK_UP;
584 printk (KERN_INFO "%s: protocol up\n", dev->name);
585 }
586 switch (sp->lcp.state) {
587 case LCP_STATE_CLOSED:
588 sp->lcp.state = LCP_STATE_ACK_RCVD;
589 sppp_set_timeout (sp, 5);
590 break;
591 case LCP_STATE_ACK_SENT:
592 sp->lcp.state = LCP_STATE_OPENED;
593 sppp_ipcp_open (sp);
594 break;
595 }
596 break;
597 case LCP_CONF_NAK:
598 if (h->ident != sp->lcp.confid)
599 break;
600 p = (u8*) (h+1);
601 if (len>=10 && p[0] == LCP_OPT_MAGIC && p[1] >= 4) {
602 rmagic = (u32)p[2] << 24 |
603 (u32)p[3] << 16 | p[4] << 8 | p[5];
604 if (rmagic == ~sp->lcp.magic) {
605 int newmagic;
606 if (sp->pp_flags & PP_DEBUG)
607 printk (KERN_DEBUG "%s: conf nak: magic glitch\n",
608 dev->name);
609 get_random_bytes(&newmagic, sizeof(newmagic));
610 sp->lcp.magic += newmagic;
611 } else
612 sp->lcp.magic = rmagic;
613 }
614 if (sp->lcp.state != LCP_STATE_ACK_SENT) {
615 /* Go to closed state. */
616 sp->lcp.state = LCP_STATE_CLOSED;
617 sp->ipcp.state = IPCP_STATE_CLOSED;
618 }
619 /* The link will be renegotiated after timeout,
620 * to avoid endless req-nack loop. */
621 sppp_clear_timeout (sp);
622 sppp_set_timeout (sp, 2);
623 break;
624 case LCP_CONF_REJ:
625 if (h->ident != sp->lcp.confid)
626 break;
627 sppp_clear_timeout (sp);
628 /* Initiate renegotiation. */
629 sppp_lcp_open (sp);
630 if (sp->lcp.state != LCP_STATE_ACK_SENT) {
631 /* Go to closed state. */
632 sp->lcp.state = LCP_STATE_CLOSED;
633 sp->ipcp.state = IPCP_STATE_CLOSED;
634 }
635 break;
636 case LCP_TERM_REQ:
637 sppp_clear_timeout (sp);
638 /* Send Terminate-Ack packet. */
639 sppp_cp_send (sp, PPP_LCP, LCP_TERM_ACK, h->ident, 0, NULL);
640 /* Go to closed state. */
641 sp->lcp.state = LCP_STATE_CLOSED;
642 sp->ipcp.state = IPCP_STATE_CLOSED;
643 /* Initiate renegotiation. */
644 sppp_lcp_open (sp);
645 break;
646 case LCP_TERM_ACK:
647 case LCP_CODE_REJ:
648 case LCP_PROTO_REJ:
649 /* Ignore for now. */
650 break;
651 case LCP_DISC_REQ:
652 /* Discard the packet. */
653 break;
654 case LCP_ECHO_REQ:
655 if (sp->lcp.state != LCP_STATE_OPENED)
656 break;
657 if (len < 8) {
658 if (sp->pp_flags & PP_DEBUG)
659 printk (KERN_WARNING "%s: invalid lcp echo request packet length: %d bytes\n",
660 dev->name, len);
661 break;
662 }
663 if (ntohl (*(__be32*)(h+1)) == sp->lcp.magic) {
664 /* Line loopback mode detected. */
665 printk (KERN_WARNING "%s: loopback\n", dev->name);
666 if_down (dev);
667
668 /* Shut down the PPP link. */
669 sp->lcp.state = LCP_STATE_CLOSED;
670 sp->ipcp.state = IPCP_STATE_CLOSED;
671 sppp_clear_timeout (sp);
672 /* Initiate negotiation. */
673 sppp_lcp_open (sp);
674 break;
675 }
676 *(__be32 *)(h+1) = htonl (sp->lcp.magic);
677 sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REPLY, h->ident, len-4, h+1);
678 break;
679 case LCP_ECHO_REPLY:
680 if (h->ident != sp->lcp.echoid)
681 break;
682 if (len < 8) {
683 if (sp->pp_flags & PP_DEBUG)
684 printk (KERN_WARNING "%s: invalid lcp echo reply packet length: %d bytes\n",
685 dev->name, len);
686 break;
687 }
688 if (ntohl(*(__be32 *)(h+1)) != sp->lcp.magic)
689 sp->pp_alivecnt = 0;
690 break;
691 }
692 }
693
694 /*
695 * Handle incoming Cisco keepalive protocol packets.
696 */
697
698 static void sppp_cisco_input (struct sppp *sp, struct sk_buff *skb)
699 {
700 struct cisco_packet *h;
701 struct net_device *dev = sp->pp_if;
702
703 if (!pskb_may_pull(skb, sizeof(struct cisco_packet))
704 || (skb->len != CISCO_PACKET_LEN
705 && skb->len != CISCO_BIG_PACKET_LEN)) {
706 if (sp->pp_flags & PP_DEBUG)
707 printk (KERN_WARNING "%s: invalid cisco packet length: %d bytes\n",
708 dev->name, skb->len);
709 return;
710 }
711 h = (struct cisco_packet *)skb->data;
712 skb_pull(skb, sizeof(struct cisco_packet*));
713 if (sp->pp_flags & PP_DEBUG)
714 printk (KERN_WARNING "%s: cisco input: %d bytes <%xh %xh %xh %xh %xh-%xh>\n",
715 dev->name, skb->len,
716 ntohl (h->type), h->par1, h->par2, h->rel,
717 h->time0, h->time1);
718 switch (ntohl (h->type)) {
719 default:
720 if (sp->pp_flags & PP_DEBUG)
721 printk (KERN_WARNING "%s: unknown cisco packet type: 0x%x\n",
722 dev->name, ntohl (h->type));
723 break;
724 case CISCO_ADDR_REPLY:
725 /* Reply on address request, ignore */
726 break;
727 case CISCO_KEEPALIVE_REQ:
728 sp->pp_alivecnt = 0;
729 sp->pp_rseq = ntohl (h->par1);
730 if (sp->pp_seq == sp->pp_rseq) {
731 /* Local and remote sequence numbers are equal.
732 * Probably, the line is in loopback mode. */
733 int newseq;
734 if (sp->pp_loopcnt >= MAXALIVECNT) {
735 printk (KERN_WARNING "%s: loopback\n",
736 dev->name);
737 sp->pp_loopcnt = 0;
738 if (dev->flags & IFF_UP) {
739 if_down (dev);
740 }
741 }
742 ++sp->pp_loopcnt;
743
744 /* Generate new local sequence number */
745 get_random_bytes(&newseq, sizeof(newseq));
746 sp->pp_seq ^= newseq;
747 break;
748 }
749 sp->pp_loopcnt = 0;
750 if (sp->pp_link_state==SPPP_LINK_DOWN &&
751 (dev->flags & IFF_UP)) {
752 sp->pp_link_state=SPPP_LINK_UP;
753 printk (KERN_INFO "%s: protocol up\n", dev->name);
754 }
755 break;
756 case CISCO_ADDR_REQ:
757 /* Stolen from net/ipv4/devinet.c -- SIOCGIFADDR ioctl */
758 {
759 struct in_device *in_dev;
760 struct in_ifaddr *ifa;
761 __be32 addr = 0, mask = htonl(~0U); /* FIXME: is the mask correct? */
762 #ifdef CONFIG_INET
763 rcu_read_lock();
764 if ((in_dev = __in_dev_get_rcu(dev)) != NULL)
765 {
766 for (ifa=in_dev->ifa_list; ifa != NULL;
767 ifa=ifa->ifa_next) {
768 if (strcmp(dev->name, ifa->ifa_label) == 0)
769 {
770 addr = ifa->ifa_local;
771 mask = ifa->ifa_mask;
772 break;
773 }
774 }
775 }
776 rcu_read_unlock();
777 #endif
778 sppp_cisco_send (sp, CISCO_ADDR_REPLY, ntohl(addr), ntohl(mask));
779 break;
780 }
781 }
782 }
783
784
785 /*
786 * Send PPP LCP packet.
787 */
788
789 static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
790 u8 ident, u16 len, void *data)
791 {
792 struct ppp_header *h;
793 struct lcp_header *lh;
794 struct sk_buff *skb;
795 struct net_device *dev = sp->pp_if;
796
797 skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+LCP_HEADER_LEN+len,
798 GFP_ATOMIC);
799 if (skb==NULL)
800 return;
801
802 skb_reserve(skb,dev->hard_header_len);
803
804 h = (struct ppp_header *)skb_put(skb, sizeof(struct ppp_header));
805 h->address = PPP_ALLSTATIONS; /* broadcast address */
806 h->control = PPP_UI; /* Unnumbered Info */
807 h->protocol = htons (proto); /* Link Control Protocol */
808
809 lh = (struct lcp_header *)skb_put(skb, sizeof(struct lcp_header));
810 lh->type = type;
811 lh->ident = ident;
812 lh->len = htons (LCP_HEADER_LEN + len);
813
814 if (len)
815 memcpy(skb_put(skb,len),data, len);
816
817 if (sp->pp_flags & PP_DEBUG) {
818 printk (KERN_WARNING "%s: %s output <%s id=%xh len=%xh",
819 dev->name,
820 proto==PPP_LCP ? "lcp" : "ipcp",
821 proto==PPP_LCP ? sppp_lcp_type_name (lh->type) :
822 sppp_ipcp_type_name (lh->type), lh->ident,
823 ntohs (lh->len));
824 if (len)
825 sppp_print_bytes ((u8*) (lh+1), len);
826 printk (">\n");
827 }
828 /* Control is high priority so it doesn't get queued behind data */
829 skb->priority=TC_PRIO_CONTROL;
830 skb->dev = dev;
831 skb_queue_tail(&tx_queue, skb);
832 }
833
834 /*
835 * Send Cisco keepalive packet.
836 */
837
838 static void sppp_cisco_send (struct sppp *sp, int type, u32 par1, u32 par2)
839 {
840 struct ppp_header *h;
841 struct cisco_packet *ch;
842 struct sk_buff *skb;
843 struct net_device *dev = sp->pp_if;
844 u32 t = jiffies * 1000/HZ;
845
846 skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+CISCO_PACKET_LEN,
847 GFP_ATOMIC);
848
849 if(skb==NULL)
850 return;
851
852 skb_reserve(skb, dev->hard_header_len);
853 h = (struct ppp_header *)skb_put (skb, sizeof(struct ppp_header));
854 h->address = CISCO_MULTICAST;
855 h->control = 0;
856 h->protocol = htons (CISCO_KEEPALIVE);
857
858 ch = (struct cisco_packet*)skb_put(skb, CISCO_PACKET_LEN);
859 ch->type = htonl (type);
860 ch->par1 = htonl (par1);
861 ch->par2 = htonl (par2);
862 ch->rel = htons(0xffff);
863 ch->time0 = htons ((u16) (t >> 16));
864 ch->time1 = htons ((u16) t);
865
866 if (sp->pp_flags & PP_DEBUG)
867 printk (KERN_WARNING "%s: cisco output: <%xh %xh %xh %xh %xh-%xh>\n",
868 dev->name, ntohl (ch->type), ch->par1,
869 ch->par2, ch->rel, ch->time0, ch->time1);
870 skb->priority=TC_PRIO_CONTROL;
871 skb->dev = dev;
872 skb_queue_tail(&tx_queue, skb);
873 }
874
875 /**
876 * sppp_close - close down a synchronous PPP or Cisco HDLC link
877 * @dev: The network device to drop the link of
878 *
879 * This drops the logical interface to the channel. It is not
880 * done politely as we assume we will also be dropping DTR. Any
881 * timeouts are killed.
882 */
883
884 int sppp_close (struct net_device *dev)
885 {
886 struct sppp *sp = (struct sppp *)sppp_of(dev);
887 unsigned long flags;
888
889 spin_lock_irqsave(&sp->lock, flags);
890 sp->pp_link_state = SPPP_LINK_DOWN;
891 sp->lcp.state = LCP_STATE_CLOSED;
892 sp->ipcp.state = IPCP_STATE_CLOSED;
893 sppp_clear_timeout (sp);
894 spin_unlock_irqrestore(&sp->lock, flags);
895
896 return 0;
897 }
898
899 EXPORT_SYMBOL(sppp_close);
900
901 /**
902 * sppp_open - open a synchronous PPP or Cisco HDLC link
903 * @dev: Network device to activate
904 *
905 * Close down any existing synchronous session and commence
906 * from scratch. In the PPP case this means negotiating LCP/IPCP
907 * and friends, while for Cisco HDLC we simply need to start sending
908 * keepalives
909 */
910
911 int sppp_open (struct net_device *dev)
912 {
913 struct sppp *sp = (struct sppp *)sppp_of(dev);
914 unsigned long flags;
915
916 sppp_close(dev);
917
918 spin_lock_irqsave(&sp->lock, flags);
919 if (!(sp->pp_flags & PP_CISCO)) {
920 sppp_lcp_open (sp);
921 }
922 sp->pp_link_state = SPPP_LINK_DOWN;
923 spin_unlock_irqrestore(&sp->lock, flags);
924 sppp_flush_xmit();
925
926 return 0;
927 }
928
929 EXPORT_SYMBOL(sppp_open);
930
931 /**
932 * sppp_reopen - notify of physical link loss
933 * @dev: Device that lost the link
934 *
935 * This function informs the synchronous protocol code that
936 * the underlying link died (for example a carrier drop on X.21)
937 *
938 * We increment the magic numbers to ensure that if the other end
939 * failed to notice we will correctly start a new session. It happens
940 * do to the nature of telco circuits is that you can lose carrier on
941 * one endonly.
942 *
943 * Having done this we go back to negotiating. This function may
944 * be called from an interrupt context.
945 */
946
947 int sppp_reopen (struct net_device *dev)
948 {
949 struct sppp *sp = (struct sppp *)sppp_of(dev);
950 unsigned long flags;
951
952 sppp_close(dev);
953
954 spin_lock_irqsave(&sp->lock, flags);
955 if (!(sp->pp_flags & PP_CISCO))
956 {
957 sp->lcp.magic = jiffies;
958 ++sp->pp_seq;
959 sp->lcp.state = LCP_STATE_CLOSED;
960 sp->ipcp.state = IPCP_STATE_CLOSED;
961 /* Give it a moment for the line to settle then go */
962 sppp_set_timeout (sp, 1);
963 }
964 sp->pp_link_state=SPPP_LINK_DOWN;
965 spin_unlock_irqrestore(&sp->lock, flags);
966
967 return 0;
968 }
969
970 EXPORT_SYMBOL(sppp_reopen);
971
972 /**
973 * sppp_change_mtu - Change the link MTU
974 * @dev: Device to change MTU on
975 * @new_mtu: New MTU
976 *
977 * Change the MTU on the link. This can only be called with
978 * the link down. It returns an error if the link is up or
979 * the mtu is out of range.
980 */
981
982 static int sppp_change_mtu(struct net_device *dev, int new_mtu)
983 {
984 if(new_mtu<128||new_mtu>PPP_MTU||(dev->flags&IFF_UP))
985 return -EINVAL;
986 dev->mtu=new_mtu;
987 return 0;
988 }
989
990 /**
991 * sppp_do_ioctl - Ioctl handler for ppp/hdlc
992 * @dev: Device subject to ioctl
993 * @ifr: Interface request block from the user
994 * @cmd: Command that is being issued
995 *
996 * This function handles the ioctls that may be issued by the user
997 * to control the settings of a PPP/HDLC link. It does both busy
998 * and security checks. This function is intended to be wrapped by
999 * callers who wish to add additional ioctl calls of their own.
1000 */
1001
1002 int sppp_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1003 {
1004 struct sppp *sp = (struct sppp *)sppp_of(dev);
1005
1006 if(dev->flags&IFF_UP)
1007 return -EBUSY;
1008
1009 if(!capable(CAP_NET_ADMIN))
1010 return -EPERM;
1011
1012 switch(cmd)
1013 {
1014 case SPPPIOCCISCO:
1015 sp->pp_flags|=PP_CISCO;
1016 dev->type = ARPHRD_HDLC;
1017 break;
1018 case SPPPIOCPPP:
1019 sp->pp_flags&=~PP_CISCO;
1020 dev->type = ARPHRD_PPP;
1021 break;
1022 case SPPPIOCDEBUG:
1023 sp->pp_flags&=~PP_DEBUG;
1024 if(ifr->ifr_flags)
1025 sp->pp_flags|=PP_DEBUG;
1026 break;
1027 case SPPPIOCGFLAGS:
1028 if(copy_to_user(ifr->ifr_data, &sp->pp_flags, sizeof(sp->pp_flags)))
1029 return -EFAULT;
1030 break;
1031 case SPPPIOCSFLAGS:
1032 if(copy_from_user(&sp->pp_flags, ifr->ifr_data, sizeof(sp->pp_flags)))
1033 return -EFAULT;
1034 break;
1035 default:
1036 return -EINVAL;
1037 }
1038 return 0;
1039 }
1040
1041 EXPORT_SYMBOL(sppp_do_ioctl);
1042
1043 /**
1044 * sppp_attach - attach synchronous PPP/HDLC to a device
1045 * @pd: PPP device to initialise
1046 *
1047 * This initialises the PPP/HDLC support on an interface. At the
1048 * time of calling the dev element must point to the network device
1049 * that this interface is attached to. The interface should not yet
1050 * be registered.
1051 */
1052
1053 void sppp_attach(struct ppp_device *pd)
1054 {
1055 struct net_device *dev = pd->dev;
1056 struct sppp *sp = &pd->sppp;
1057 unsigned long flags;
1058
1059 /* Make sure embedding is safe for sppp_of */
1060 BUG_ON(sppp_of(dev) != sp);
1061
1062 spin_lock_irqsave(&spppq_lock, flags);
1063 /* Initialize keepalive handler. */
1064 if (! spppq)
1065 {
1066 init_timer(&sppp_keepalive_timer);
1067 sppp_keepalive_timer.expires=jiffies+10*HZ;
1068 sppp_keepalive_timer.function=sppp_keepalive;
1069 add_timer(&sppp_keepalive_timer);
1070 }
1071 /* Insert new entry into the keepalive list. */
1072 sp->pp_next = spppq;
1073 spppq = sp;
1074 spin_unlock_irqrestore(&spppq_lock, flags);
1075
1076 sp->pp_loopcnt = 0;
1077 sp->pp_alivecnt = 0;
1078 sp->pp_seq = 0;
1079 sp->pp_rseq = 0;
1080 sp->pp_flags = PP_KEEPALIVE|PP_CISCO|debug;/*PP_DEBUG;*/
1081 sp->lcp.magic = 0;
1082 sp->lcp.state = LCP_STATE_CLOSED;
1083 sp->ipcp.state = IPCP_STATE_CLOSED;
1084 sp->pp_if = dev;
1085 spin_lock_init(&sp->lock);
1086
1087 /*
1088 * Device specific setup. All but interrupt handler and
1089 * hard_start_xmit.
1090 */
1091
1092 dev->header_ops = &sppp_header_ops;
1093
1094 dev->tx_queue_len = 10;
1095 dev->type = ARPHRD_HDLC;
1096 dev->addr_len = 0;
1097 dev->hard_header_len = sizeof(struct ppp_header);
1098 dev->mtu = PPP_MTU;
1099 /*
1100 * These 4 are callers but MUST also call sppp_ functions
1101 */
1102 dev->do_ioctl = sppp_do_ioctl;
1103 #if 0
1104 dev->get_stats = NULL; /* Let the driver override these */
1105 dev->open = sppp_open;
1106 dev->stop = sppp_close;
1107 #endif
1108 dev->change_mtu = sppp_change_mtu;
1109 dev->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP;
1110 }
1111
1112 EXPORT_SYMBOL(sppp_attach);
1113
1114 /**
1115 * sppp_detach - release PPP resources from a device
1116 * @dev: Network device to release
1117 *
1118 * Stop and free up any PPP/HDLC resources used by this
1119 * interface. This must be called before the device is
1120 * freed.
1121 */
1122
1123 void sppp_detach (struct net_device *dev)
1124 {
1125 struct sppp **q, *p, *sp = (struct sppp *)sppp_of(dev);
1126 unsigned long flags;
1127
1128 spin_lock_irqsave(&spppq_lock, flags);
1129 /* Remove the entry from the keepalive list. */
1130 for (q = &spppq; (p = *q); q = &p->pp_next)
1131 if (p == sp) {
1132 *q = p->pp_next;
1133 break;
1134 }
1135
1136 /* Stop keepalive handler. */
1137 if (! spppq)
1138 del_timer(&sppp_keepalive_timer);
1139 sppp_clear_timeout (sp);
1140 spin_unlock_irqrestore(&spppq_lock, flags);
1141 }
1142
1143 EXPORT_SYMBOL(sppp_detach);
1144
1145 /*
1146 * Analyze the LCP Configure-Request options list
1147 * for the presence of unknown options.
1148 * If the request contains unknown options, build and
1149 * send Configure-reject packet, containing only unknown options.
1150 */
1151 static int
1152 sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
1153 int len, u32 *magic)
1154 {
1155 u8 *buf, *r, *p;
1156 int rlen;
1157
1158 len -= 4;
1159 buf = r = kmalloc (len, GFP_ATOMIC);
1160 if (! buf)
1161 return (0);
1162
1163 p = (void*) (h+1);
1164 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
1165 switch (*p) {
1166 case LCP_OPT_MAGIC:
1167 /* Magic number -- extract. */
1168 if (len >= 6 && p[1] == 6) {
1169 *magic = (u32)p[2] << 24 |
1170 (u32)p[3] << 16 | p[4] << 8 | p[5];
1171 continue;
1172 }
1173 break;
1174 case LCP_OPT_ASYNC_MAP:
1175 /* Async control character map -- check to be zero. */
1176 if (len >= 6 && p[1] == 6 && ! p[2] && ! p[3] &&
1177 ! p[4] && ! p[5])
1178 continue;
1179 break;
1180 case LCP_OPT_MRU:
1181 /* Maximum receive unit -- always OK. */
1182 continue;
1183 default:
1184 /* Others not supported. */
1185 break;
1186 }
1187 /* Add the option to rejected list. */
1188 memcpy(r, p, p[1]);
1189 r += p[1];
1190 rlen += p[1];
1191 }
1192 if (rlen)
1193 sppp_cp_send (sp, PPP_LCP, LCP_CONF_REJ, h->ident, rlen, buf);
1194 kfree(buf);
1195 return (rlen == 0);
1196 }
1197
1198 static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *skb)
1199 {
1200 struct lcp_header *h;
1201 struct net_device *dev = sp->pp_if;
1202 int len = skb->len;
1203
1204 if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
1205 if (sp->pp_flags & PP_DEBUG)
1206 printk (KERN_WARNING "%s: invalid ipcp packet length: %d bytes\n",
1207 dev->name, len);
1208 return;
1209 }
1210 h = (struct lcp_header *)skb->data;
1211 skb_pull(skb,sizeof(struct lcp_header));
1212 if (sp->pp_flags & PP_DEBUG) {
1213 printk (KERN_WARNING "%s: ipcp input: %d bytes <%s id=%xh len=%xh",
1214 dev->name, len,
1215 sppp_ipcp_type_name (h->type), h->ident, ntohs (h->len));
1216 if (len > 4)
1217 sppp_print_bytes ((u8*) (h+1), len-4);
1218 printk (">\n");
1219 }
1220 if (len > ntohs (h->len))
1221 len = ntohs (h->len);
1222 switch (h->type) {
1223 default:
1224 /* Unknown packet type -- send Code-Reject packet. */
1225 sppp_cp_send (sp, PPP_IPCP, IPCP_CODE_REJ, ++sp->pp_seq, len, h);
1226 break;
1227 case IPCP_CONF_REQ:
1228 if (len < 4) {
1229 if (sp->pp_flags & PP_DEBUG)
1230 printk (KERN_WARNING "%s: invalid ipcp configure request packet length: %d bytes\n",
1231 dev->name, len);
1232 return;
1233 }
1234 if (len > 4) {
1235 sppp_cp_send (sp, PPP_IPCP, LCP_CONF_REJ, h->ident,
1236 len-4, h+1);
1237
1238 switch (sp->ipcp.state) {
1239 case IPCP_STATE_OPENED:
1240 /* Initiate renegotiation. */
1241 sppp_ipcp_open (sp);
1242 /* fall through... */
1243 case IPCP_STATE_ACK_SENT:
1244 /* Go to closed state. */
1245 sp->ipcp.state = IPCP_STATE_CLOSED;
1246 }
1247 } else {
1248 /* Send Configure-Ack packet. */
1249 sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_ACK, h->ident,
1250 0, NULL);
1251 /* Change the state. */
1252 if (sp->ipcp.state == IPCP_STATE_ACK_RCVD)
1253 sp->ipcp.state = IPCP_STATE_OPENED;
1254 else
1255 sp->ipcp.state = IPCP_STATE_ACK_SENT;
1256 }
1257 break;
1258 case IPCP_CONF_ACK:
1259 if (h->ident != sp->ipcp.confid)
1260 break;
1261 sppp_clear_timeout (sp);
1262 switch (sp->ipcp.state) {
1263 case IPCP_STATE_CLOSED:
1264 sp->ipcp.state = IPCP_STATE_ACK_RCVD;
1265 sppp_set_timeout (sp, 5);
1266 break;
1267 case IPCP_STATE_ACK_SENT:
1268 sp->ipcp.state = IPCP_STATE_OPENED;
1269 break;
1270 }
1271 break;
1272 case IPCP_CONF_NAK:
1273 case IPCP_CONF_REJ:
1274 if (h->ident != sp->ipcp.confid)
1275 break;
1276 sppp_clear_timeout (sp);
1277 /* Initiate renegotiation. */
1278 sppp_ipcp_open (sp);
1279 if (sp->ipcp.state != IPCP_STATE_ACK_SENT)
1280 /* Go to closed state. */
1281 sp->ipcp.state = IPCP_STATE_CLOSED;
1282 break;
1283 case IPCP_TERM_REQ:
1284 /* Send Terminate-Ack packet. */
1285 sppp_cp_send (sp, PPP_IPCP, IPCP_TERM_ACK, h->ident, 0, NULL);
1286 /* Go to closed state. */
1287 sp->ipcp.state = IPCP_STATE_CLOSED;
1288 /* Initiate renegotiation. */
1289 sppp_ipcp_open (sp);
1290 break;
1291 case IPCP_TERM_ACK:
1292 /* Ignore for now. */
1293 case IPCP_CODE_REJ:
1294 /* Ignore for now. */
1295 break;
1296 }
1297 }
1298
1299 static void sppp_lcp_open (struct sppp *sp)
1300 {
1301 char opt[6];
1302
1303 if (! sp->lcp.magic)
1304 sp->lcp.magic = jiffies;
1305 opt[0] = LCP_OPT_MAGIC;
1306 opt[1] = sizeof (opt);
1307 opt[2] = sp->lcp.magic >> 24;
1308 opt[3] = sp->lcp.magic >> 16;
1309 opt[4] = sp->lcp.magic >> 8;
1310 opt[5] = sp->lcp.magic;
1311 sp->lcp.confid = ++sp->pp_seq;
1312 sppp_cp_send (sp, PPP_LCP, LCP_CONF_REQ, sp->lcp.confid,
1313 sizeof (opt), &opt);
1314 sppp_set_timeout (sp, 2);
1315 }
1316
1317 static void sppp_ipcp_open (struct sppp *sp)
1318 {
1319 sp->ipcp.confid = ++sp->pp_seq;
1320 sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_REQ, sp->ipcp.confid, 0, NULL);
1321 sppp_set_timeout (sp, 2);
1322 }
1323
1324 /*
1325 * Process PPP control protocol timeouts.
1326 */
1327
1328 static void sppp_cp_timeout (unsigned long arg)
1329 {
1330 struct sppp *sp = (struct sppp*) arg;
1331 unsigned long flags;
1332
1333 spin_lock_irqsave(&sp->lock, flags);
1334
1335 sp->pp_flags &= ~PP_TIMO;
1336 if (! (sp->pp_if->flags & IFF_UP) || (sp->pp_flags & PP_CISCO)) {
1337 spin_unlock_irqrestore(&sp->lock, flags);
1338 return;
1339 }
1340 switch (sp->lcp.state) {
1341 case LCP_STATE_CLOSED:
1342 /* No ACK for Configure-Request, retry. */
1343 sppp_lcp_open (sp);
1344 break;
1345 case LCP_STATE_ACK_RCVD:
1346 /* ACK got, but no Configure-Request for peer, retry. */
1347 sppp_lcp_open (sp);
1348 sp->lcp.state = LCP_STATE_CLOSED;
1349 break;
1350 case LCP_STATE_ACK_SENT:
1351 /* ACK sent but no ACK for Configure-Request, retry. */
1352 sppp_lcp_open (sp);
1353 break;
1354 case LCP_STATE_OPENED:
1355 /* LCP is already OK, try IPCP. */
1356 switch (sp->ipcp.state) {
1357 case IPCP_STATE_CLOSED:
1358 /* No ACK for Configure-Request, retry. */
1359 sppp_ipcp_open (sp);
1360 break;
1361 case IPCP_STATE_ACK_RCVD:
1362 /* ACK got, but no Configure-Request for peer, retry. */
1363 sppp_ipcp_open (sp);
1364 sp->ipcp.state = IPCP_STATE_CLOSED;
1365 break;
1366 case IPCP_STATE_ACK_SENT:
1367 /* ACK sent but no ACK for Configure-Request, retry. */
1368 sppp_ipcp_open (sp);
1369 break;
1370 case IPCP_STATE_OPENED:
1371 /* IPCP is OK. */
1372 break;
1373 }
1374 break;
1375 }
1376 spin_unlock_irqrestore(&sp->lock, flags);
1377 sppp_flush_xmit();
1378 }
1379
1380 static char *sppp_lcp_type_name (u8 type)
1381 {
1382 static char buf [8];
1383 switch (type) {
1384 case LCP_CONF_REQ: return ("conf-req");
1385 case LCP_CONF_ACK: return ("conf-ack");
1386 case LCP_CONF_NAK: return ("conf-nack");
1387 case LCP_CONF_REJ: return ("conf-rej");
1388 case LCP_TERM_REQ: return ("term-req");
1389 case LCP_TERM_ACK: return ("term-ack");
1390 case LCP_CODE_REJ: return ("code-rej");
1391 case LCP_PROTO_REJ: return ("proto-rej");
1392 case LCP_ECHO_REQ: return ("echo-req");
1393 case LCP_ECHO_REPLY: return ("echo-reply");
1394 case LCP_DISC_REQ: return ("discard-req");
1395 }
1396 sprintf (buf, "%xh", type);
1397 return (buf);
1398 }
1399
1400 static char *sppp_ipcp_type_name (u8 type)
1401 {
1402 static char buf [8];
1403 switch (type) {
1404 case IPCP_CONF_REQ: return ("conf-req");
1405 case IPCP_CONF_ACK: return ("conf-ack");
1406 case IPCP_CONF_NAK: return ("conf-nack");
1407 case IPCP_CONF_REJ: return ("conf-rej");
1408 case IPCP_TERM_REQ: return ("term-req");
1409 case IPCP_TERM_ACK: return ("term-ack");
1410 case IPCP_CODE_REJ: return ("code-rej");
1411 }
1412 sprintf (buf, "%xh", type);
1413 return (buf);
1414 }
1415
1416 static void sppp_print_bytes (u_char *p, u16 len)
1417 {
1418 printk (" %x", *p++);
1419 while (--len > 0)
1420 printk ("-%x", *p++);
1421 }
1422
1423 /**
1424 * sppp_rcv - receive and process a WAN PPP frame
1425 * @skb: The buffer to process
1426 * @dev: The device it arrived on
1427 * @p: Unused
1428 * @orig_dev: Unused
1429 *
1430 * Protocol glue. This drives the deferred processing mode the poorer
1431 * cards use. This can be called directly by cards that do not have
1432 * timing constraints but is normally called from the network layer
1433 * after interrupt servicing to process frames queued via netif_rx.
1434 */
1435
1436 static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p, struct net_device *orig_dev)
1437 {
1438 if (dev_net(dev) != &init_net) {
1439 kfree_skb(skb);
1440 return 0;
1441 }
1442
1443 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
1444 return NET_RX_DROP;
1445 sppp_input(dev,skb);
1446 return 0;
1447 }
1448
1449 static struct packet_type sppp_packet_type = {
1450 .type = __constant_htons(ETH_P_WAN_PPP),
1451 .func = sppp_rcv,
1452 };
1453
1454 static char banner[] __initdata =
1455 KERN_INFO "Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994\n"
1456 KERN_INFO "Linux port (c) 1998 Building Number Three Ltd & "
1457 "Jan \"Yenya\" Kasprzak.\n";
1458
1459 static int __init sync_ppp_init(void)
1460 {
1461 if(debug)
1462 debug=PP_DEBUG;
1463 printk(banner);
1464 skb_queue_head_init(&tx_queue);
1465 dev_add_pack(&sppp_packet_type);
1466 return 0;
1467 }
1468
1469
1470 static void __exit sync_ppp_cleanup(void)
1471 {
1472 dev_remove_pack(&sppp_packet_type);
1473 }
1474
1475 module_init(sync_ppp_init);
1476 module_exit(sync_ppp_cleanup);
1477 module_param(debug, int, 0);
1478 MODULE_LICENSE("GPL");
1479
Linux kernel - Deliverables
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