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1da177e4
LT		 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
1da177e4
LT		 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/syncppp.h>
55
56#include <asm/byteorder.h>
57#include <asm/uaccess.h>
58
59#define MAXALIVECNT 6 /* max. alive packets */
60
61#define PPP_ALLSTATIONS 0xff /* All-Stations broadcast address */
62#define PPP_UI 0x03 /* Unnumbered Information */
63#define PPP_IP 0x0021 /* Internet Protocol */
64#define PPP_ISO 0x0023 /* ISO OSI Protocol */
65#define PPP_XNS 0x0025 /* Xerox NS Protocol */
66#define PPP_IPX 0x002b /* Novell IPX Protocol */
67#define PPP_LCP 0xc021 /* Link Control Protocol */
68#define PPP_IPCP 0x8021 /* Internet Protocol Control Protocol */
69
70#define LCP_CONF_REQ 1 /* PPP LCP configure request */
71#define LCP_CONF_ACK 2 /* PPP LCP configure acknowledge */
72#define LCP_CONF_NAK 3 /* PPP LCP configure negative ack */
73#define LCP_CONF_REJ 4 /* PPP LCP configure reject */
74#define LCP_TERM_REQ 5 /* PPP LCP terminate request */
75#define LCP_TERM_ACK 6 /* PPP LCP terminate acknowledge */
76#define LCP_CODE_REJ 7 /* PPP LCP code reject */
77#define LCP_PROTO_REJ 8 /* PPP LCP protocol reject */
78#define LCP_ECHO_REQ 9 /* PPP LCP echo request */
79#define LCP_ECHO_REPLY 10 /* PPP LCP echo reply */
80#define LCP_DISC_REQ 11 /* PPP LCP discard request */
81
82#define LCP_OPT_MRU 1 /* maximum receive unit */
83#define LCP_OPT_ASYNC_MAP 2 /* async control character map */
84#define LCP_OPT_AUTH_PROTO 3 /* authentication protocol */
85#define LCP_OPT_QUAL_PROTO 4 /* quality protocol */
86#define LCP_OPT_MAGIC 5 /* magic number */
87#define LCP_OPT_RESERVED 6 /* reserved */
88#define LCP_OPT_PROTO_COMP 7 /* protocol field compression */
89#define LCP_OPT_ADDR_COMP 8 /* address/control field compression */
90
91#define IPCP_CONF_REQ LCP_CONF_REQ /* PPP IPCP configure request */
92#define IPCP_CONF_ACK LCP_CONF_ACK /* PPP IPCP configure acknowledge */
93#define IPCP_CONF_NAK LCP_CONF_NAK /* PPP IPCP configure negative ack */
94#define IPCP_CONF_REJ LCP_CONF_REJ /* PPP IPCP configure reject */
95#define IPCP_TERM_REQ LCP_TERM_REQ /* PPP IPCP terminate request */
96#define IPCP_TERM_ACK LCP_TERM_ACK /* PPP IPCP terminate acknowledge */
97#define IPCP_CODE_REJ LCP_CODE_REJ /* PPP IPCP code reject */
98
99#define CISCO_MULTICAST 0x8f /* Cisco multicast address */
100#define CISCO_UNICAST 0x0f /* Cisco unicast address */
101#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
102#define CISCO_ADDR_REQ 0 /* Cisco address request */
103#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
104#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
105
106struct ppp_header {
107 u8 address;
108 u8 control;
109 u16 protocol;
110};
111#define PPP_HEADER_LEN sizeof (struct ppp_header)
112
113struct lcp_header {
114 u8 type;
115 u8 ident;
116 u16 len;
117};
118#define LCP_HEADER_LEN sizeof (struct lcp_header)
119
120struct cisco_packet {
121 u32 type;
122 u32 par1;
123 u32 par2;
124 u16 rel;
125 u16 time0;
126 u16 time1;
127};
128#define CISCO_PACKET_LEN 18
129#define CISCO_BIG_PACKET_LEN 20
130
131static struct sppp *spppq;
132static struct timer_list sppp_keepalive_timer;
133static DEFINE_SPINLOCK(spppq_lock);
134
135/* global xmit queue for sending packets while spinlock is held */
136static struct sk_buff_head tx_queue;
137
138static void sppp_keepalive (unsigned long dummy);
139static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
140 u8 ident, u16 len, void *data);
141static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2);
142static void sppp_lcp_input (struct sppp *sp, struct sk_buff *m);
143static void sppp_cisco_input (struct sppp *sp, struct sk_buff *m);
144static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *m);
145static void sppp_lcp_open (struct sppp *sp);
146static void sppp_ipcp_open (struct sppp *sp);
147static int sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
148 int len, u32 *magic);
149static void sppp_cp_timeout (unsigned long arg);
150static char *sppp_lcp_type_name (u8 type);
151static char *sppp_ipcp_type_name (u8 type);
152static void sppp_print_bytes (u8 *p, u16 len);
153
154static int debug;
155
156/* Flush global outgoing packet queue to dev_queue_xmit().
157 *
158 * dev_queue_xmit() must be called with interrupts enabled
159 * which means it can't be called with spinlocks held.
160 * If a packet needs to be sent while a spinlock is held,
161 * then put the packet into tx_queue, and call sppp_flush_xmit()
162 * after spinlock is released.
163 */
164static void sppp_flush_xmit(void)
165{
166 struct sk_buff *skb;
167 while ((skb = skb_dequeue(&tx_queue)) != NULL)
168 dev_queue_xmit(skb);
169}
170
171/*
172 * Interface down stub
173 */
174
175static void if_down(struct net_device *dev)
176{
177 struct sppp *sp = (struct sppp *)sppp_of(dev);
178
179 sp->pp_link_state=SPPP_LINK_DOWN;
180}
181
182/*
183 * Timeout routine activations.
184 */
185
186static void sppp_set_timeout(struct sppp *p,int s)
187{
188 if (! (p->pp_flags & PP_TIMO))
189 {
190 init_timer(&p->pp_timer);
191 p->pp_timer.function=sppp_cp_timeout;
192 p->pp_timer.expires=jiffies+s*HZ;
193 p->pp_timer.data=(unsigned long)p;
194 p->pp_flags |= PP_TIMO;
195 add_timer(&p->pp_timer);
196 }
197}
198
199static void sppp_clear_timeout(struct sppp *p)
200{
201 if (p->pp_flags & PP_TIMO)
202 {
203 del_timer(&p->pp_timer);
204 p->pp_flags &= ~PP_TIMO;
205 }
206}
207
208/**
209 * sppp_input - receive and process a WAN PPP frame
210 * @skb: The buffer to process
211 * @dev: The device it arrived on
212 *
213 * This can be called directly by cards that do not have
214 * timing constraints but is normally called from the network layer
215 * after interrupt servicing to process frames queued via netif_rx().
216 *
217 * We process the options in the card. If the frame is destined for
218 * the protocol stacks then it requeues the frame for the upper level
219 * protocol. If it is a control from it is processed and discarded
220 * here.
221 */
222
7665a089 223static void sppp_input (struct net_device *dev, struct sk_buff *skb)
1da177e4
LT		 224{
225 struct ppp_header *h;
226 struct sppp *sp = (struct sppp *)sppp_of(dev);
227 unsigned long flags;
228
229 skb->dev=dev;
230 skb->mac.raw=skb->data;
231
232 if (dev->flags & IFF_RUNNING)
233 {
234 /* Count received bytes, add FCS and one flag */
235 sp->ibytes+= skb->len + 3;
236 sp->ipkts++;
237 }
238
239 if (!pskb_may_pull(skb, PPP_HEADER_LEN)) {
240 /* Too small packet, drop it. */
241 if (sp->pp_flags & PP_DEBUG)
242 printk (KERN_DEBUG "%s: input packet is too small, %d bytes\n",
243 dev->name, skb->len);
244 kfree_skb(skb);
245 return;
246 }
247
248 /* Get PPP header. */
249 h = (struct ppp_header *)skb->data;
250 skb_pull(skb,sizeof(struct ppp_header));
251
252 spin_lock_irqsave(&sp->lock, flags);
253
254 switch (h->address) {
255 default: /* Invalid PPP packet. */
256 goto invalid;
257 case PPP_ALLSTATIONS:
258 if (h->control != PPP_UI)
259 goto invalid;
260 if (sp->pp_flags & PP_CISCO) {
261 if (sp->pp_flags & PP_DEBUG)
262 printk (KERN_WARNING "%s: PPP packet in Cisco mode <0x%x 0x%x 0x%x>\n",
263 dev->name,
264 h->address, h->control, ntohs (h->protocol));
265 goto drop;
266 }
267 switch (ntohs (h->protocol)) {
268 default:
269 if (sp->lcp.state == LCP_STATE_OPENED)
270 sppp_cp_send (sp, PPP_LCP, LCP_PROTO_REJ,
271 ++sp->pp_seq, skb->len + 2,
272 &h->protocol);
273 if (sp->pp_flags & PP_DEBUG)
274 printk (KERN_WARNING "%s: invalid input protocol <0x%x 0x%x 0x%x>\n",
275 dev->name,
276 h->address, h->control, ntohs (h->protocol));
277 goto drop;
278 case PPP_LCP:
279 sppp_lcp_input (sp, skb);
280 goto drop;
281 case PPP_IPCP:
282 if (sp->lcp.state == LCP_STATE_OPENED)
283 sppp_ipcp_input (sp, skb);
284 else
285 printk(KERN_DEBUG "IPCP when still waiting LCP finish.\n");
286 goto drop;
287 case PPP_IP:
288 if (sp->ipcp.state == IPCP_STATE_OPENED) {
289 if(sp->pp_flags&PP_DEBUG)
290 printk(KERN_DEBUG "Yow an IP frame.\n");
291 skb->protocol=htons(ETH_P_IP);
292 netif_rx(skb);
293 dev->last_rx = jiffies;
294 goto done;
295 }
296 break;
297#ifdef IPX
298 case PPP_IPX:
299 /* IPX IPXCP not implemented yet */
300 if (sp->lcp.state == LCP_STATE_OPENED) {
301 skb->protocol=htons(ETH_P_IPX);
302 netif_rx(skb);
303 dev->last_rx = jiffies;
304 goto done;
305 }
306 break;
307#endif
308 }
309 break;
310 case CISCO_MULTICAST:
311 case CISCO_UNICAST:
312 /* Don't check the control field here (RFC 1547). */
313 if (! (sp->pp_flags & PP_CISCO)) {
314 if (sp->pp_flags & PP_DEBUG)
315 printk (KERN_WARNING "%s: Cisco packet in PPP mode <0x%x 0x%x 0x%x>\n",
316 dev->name,
317 h->address, h->control, ntohs (h->protocol));
318 goto drop;
319 }
320 switch (ntohs (h->protocol)) {
321 default:
322 goto invalid;
323 case CISCO_KEEPALIVE:
324 sppp_cisco_input (sp, skb);
325 goto drop;
326#ifdef CONFIG_INET
327 case ETH_P_IP:
328 skb->protocol=htons(ETH_P_IP);
329 netif_rx(skb);
330 dev->last_rx = jiffies;
331 goto done;
332#endif
333#ifdef CONFIG_IPX
334 case ETH_P_IPX:
335 skb->protocol=htons(ETH_P_IPX);
336 netif_rx(skb);
337 dev->last_rx = jiffies;
338 goto done;
339#endif
340 }
341 break;
342 }
343 goto drop;
344
345invalid:
346 if (sp->pp_flags & PP_DEBUG)
347 printk (KERN_WARNING "%s: invalid input packet <0x%x 0x%x 0x%x>\n",
348 dev->name, h->address, h->control, ntohs (h->protocol));
349drop:
350 kfree_skb(skb);
351done:
352 spin_unlock_irqrestore(&sp->lock, flags);
353 sppp_flush_xmit();
354 return;
355}
356
1da177e4
LT		 357/*
358 * Handle transmit packets.
359 */
360
361static int sppp_hard_header(struct sk_buff *skb, struct net_device *dev, __u16 type,
362 void *daddr, void *saddr, unsigned int len)
363{
364 struct sppp *sp = (struct sppp *)sppp_of(dev);
365 struct ppp_header *h;
366 skb_push(skb,sizeof(struct ppp_header));
367 h=(struct ppp_header *)skb->data;
368 if(sp->pp_flags&PP_CISCO)
369 {
370 h->address = CISCO_UNICAST;
371 h->control = 0;
372 }
373 else
374 {
375 h->address = PPP_ALLSTATIONS;
376 h->control = PPP_UI;
377 }
378 if(sp->pp_flags & PP_CISCO)
379 {
380 h->protocol = htons(type);
381 }
382 else switch(type)
383 {
384 case ETH_P_IP:
385 h->protocol = htons(PPP_IP);
386 break;
387 case ETH_P_IPX:
388 h->protocol = htons(PPP_IPX);
389 break;
390 }
391 return sizeof(struct ppp_header);
392}
393
394static int sppp_rebuild_header(struct sk_buff *skb)
395{
396 return 0;
397}
398
399/*
400 * Send keepalive packets, every 10 seconds.
401 */
402
403static void sppp_keepalive (unsigned long dummy)
404{
405 struct sppp *sp;
406 unsigned long flags;
407
408 spin_lock_irqsave(&spppq_lock, flags);
409
410 for (sp=spppq; sp; sp=sp->pp_next)
411 {
412 struct net_device *dev = sp->pp_if;
413
414 /* Keepalive mode disabled or channel down? */
415 if (! (sp->pp_flags & PP_KEEPALIVE) ||
416 ! (dev->flags & IFF_UP))
417 continue;
418
419 spin_lock(&sp->lock);
420
421 /* No keepalive in PPP mode if LCP not opened yet. */
422 if (! (sp->pp_flags & PP_CISCO) &&
423 sp->lcp.state != LCP_STATE_OPENED) {
424 spin_unlock(&sp->lock);
425 continue;
426 }
427
428 if (sp->pp_alivecnt == MAXALIVECNT) {
429 /* No keepalive packets got. Stop the interface. */
430 printk (KERN_WARNING "%s: protocol down\n", dev->name);
431 if_down (dev);
432 if (! (sp->pp_flags & PP_CISCO)) {
433 /* Shut down the PPP link. */
434 sp->lcp.magic = jiffies;
435 sp->lcp.state = LCP_STATE_CLOSED;
436 sp->ipcp.state = IPCP_STATE_CLOSED;
437 sppp_clear_timeout (sp);
438 /* Initiate negotiation. */
439 sppp_lcp_open (sp);
440 }
441 }
442 if (sp->pp_alivecnt <= MAXALIVECNT)
443 ++sp->pp_alivecnt;
444 if (sp->pp_flags & PP_CISCO)
445 sppp_cisco_send (sp, CISCO_KEEPALIVE_REQ, ++sp->pp_seq,
446 sp->pp_rseq);
447 else if (sp->lcp.state == LCP_STATE_OPENED) {
448 long nmagic = htonl (sp->lcp.magic);
449 sp->lcp.echoid = ++sp->pp_seq;
450 sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REQ,
451 sp->lcp.echoid, 4, &nmagic);
452 }
453
454 spin_unlock(&sp->lock);
455 }
456 spin_unlock_irqrestore(&spppq_lock, flags);
457 sppp_flush_xmit();
458 sppp_keepalive_timer.expires=jiffies+10*HZ;
459 add_timer(&sppp_keepalive_timer);
460}
461
462/*
463 * Handle incoming PPP Link Control Protocol packets.
464 */
465
466static void sppp_lcp_input (struct sppp *sp, struct sk_buff *skb)
467{
468 struct lcp_header *h;
469 struct net_device *dev = sp->pp_if;
470 int len = skb->len;
471 u8 *p, opt[6];
472 u32 rmagic;
473
474 if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
475 if (sp->pp_flags & PP_DEBUG)
476 printk (KERN_WARNING "%s: invalid lcp packet length: %d bytes\n",
477 dev->name, len);
478 return;
479 }
480 h = (struct lcp_header *)skb->data;
481 skb_pull(skb,sizeof(struct lcp_header *));
482
483 if (sp->pp_flags & PP_DEBUG)
484 {
485 char state = '?';
486 switch (sp->lcp.state) {
487 case LCP_STATE_CLOSED: state = 'C'; break;
488 case LCP_STATE_ACK_RCVD: state = 'R'; break;
489 case LCP_STATE_ACK_SENT: state = 'S'; break;
490 case LCP_STATE_OPENED: state = 'O'; break;
491 }
492 printk (KERN_WARNING "%s: lcp input(%c): %d bytes <%s id=%xh len=%xh",
493 dev->name, state, len,
494 sppp_lcp_type_name (h->type), h->ident, ntohs (h->len));
495 if (len > 4)
496 sppp_print_bytes ((u8*) (h+1), len-4);
497 printk (">\n");
498 }
499 if (len > ntohs (h->len))
500 len = ntohs (h->len);
501 switch (h->type) {
502 default:
503 /* Unknown packet type -- send Code-Reject packet. */
504 sppp_cp_send (sp, PPP_LCP, LCP_CODE_REJ, ++sp->pp_seq,
505 skb->len, h);
506 break;
507 case LCP_CONF_REQ:
508 if (len < 4) {
509 if (sp->pp_flags & PP_DEBUG)
510 printk (KERN_DEBUG"%s: invalid lcp configure request packet length: %d bytes\n",
511 dev->name, len);
512 break;
513 }
514 if (len>4 && !sppp_lcp_conf_parse_options (sp, h, len, &rmagic))
515 goto badreq;
516 if (rmagic == sp->lcp.magic) {
517 /* Local and remote magics equal -- loopback? */
518 if (sp->pp_loopcnt >= MAXALIVECNT*5) {
519 printk (KERN_WARNING "%s: loopback\n",
520 dev->name);
521 sp->pp_loopcnt = 0;
522 if (dev->flags & IFF_UP) {
523 if_down (dev);
524 }
525 } else if (sp->pp_flags & PP_DEBUG)
526 printk (KERN_DEBUG "%s: conf req: magic glitch\n",
527 dev->name);
528 ++sp->pp_loopcnt;
529
530 /* MUST send Conf-Nack packet. */
531 rmagic = ~sp->lcp.magic;
532 opt[0] = LCP_OPT_MAGIC;
533 opt[1] = sizeof (opt);
534 opt[2] = rmagic >> 24;
535 opt[3] = rmagic >> 16;
536 opt[4] = rmagic >> 8;
537 opt[5] = rmagic;
538 sppp_cp_send (sp, PPP_LCP, LCP_CONF_NAK,
539 h->ident, sizeof (opt), &opt);
540badreq:
541 switch (sp->lcp.state) {
542 case LCP_STATE_OPENED:
543 /* Initiate renegotiation. */
544 sppp_lcp_open (sp);
545 /* fall through... */
546 case LCP_STATE_ACK_SENT:
547 /* Go to closed state. */
548 sp->lcp.state = LCP_STATE_CLOSED;
549 sp->ipcp.state = IPCP_STATE_CLOSED;
550 }
551 break;
552 }
553 /* Send Configure-Ack packet. */
554 sp->pp_loopcnt = 0;
555 if (sp->lcp.state != LCP_STATE_OPENED) {
556 sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
557 h->ident, len-4, h+1);
558 }
559 /* Change the state. */
560 switch (sp->lcp.state) {
561 case LCP_STATE_CLOSED:
562 sp->lcp.state = LCP_STATE_ACK_SENT;
563 break;
564 case LCP_STATE_ACK_RCVD:
565 sp->lcp.state = LCP_STATE_OPENED;
566 sppp_ipcp_open (sp);
567 break;
568 case LCP_STATE_OPENED:
569 /* Remote magic changed -- close session. */
570 sp->lcp.state = LCP_STATE_CLOSED;
571 sp->ipcp.state = IPCP_STATE_CLOSED;
572 /* Initiate renegotiation. */
573 sppp_lcp_open (sp);
574 /* Send ACK after our REQ in attempt to break loop */
575 sppp_cp_send (sp, PPP_LCP, LCP_CONF_ACK,
576 h->ident, len-4, h+1);
577 sp->lcp.state = LCP_STATE_ACK_SENT;
578 break;
579 }
580 break;
581 case LCP_CONF_ACK:
582 if (h->ident != sp->lcp.confid)
583 break;
584 sppp_clear_timeout (sp);
585 if ((sp->pp_link_state != SPPP_LINK_UP) &&
586 (dev->flags & IFF_UP)) {
587 /* Coming out of loopback mode. */
588 sp->pp_link_state=SPPP_LINK_UP;
589 printk (KERN_INFO "%s: protocol up\n", dev->name);
590 }
591 switch (sp->lcp.state) {
592 case LCP_STATE_CLOSED:
593 sp->lcp.state = LCP_STATE_ACK_RCVD;
594 sppp_set_timeout (sp, 5);
595 break;
596 case LCP_STATE_ACK_SENT:
597 sp->lcp.state = LCP_STATE_OPENED;
598 sppp_ipcp_open (sp);
599 break;
600 }
601 break;
602 case LCP_CONF_NAK:
603 if (h->ident != sp->lcp.confid)
604 break;
605 p = (u8*) (h+1);
606 if (len>=10 && p[0] == LCP_OPT_MAGIC && p[1] >= 4) {
607 rmagic = (u32)p[2] << 24 |
608 (u32)p[3] << 16 | p[4] << 8 | p[5];
609 if (rmagic == ~sp->lcp.magic) {
610 int newmagic;
611 if (sp->pp_flags & PP_DEBUG)
612 printk (KERN_DEBUG "%s: conf nak: magic glitch\n",
613 dev->name);
614 get_random_bytes(&newmagic, sizeof(newmagic));
615 sp->lcp.magic += newmagic;
616 } else
617 sp->lcp.magic = rmagic;
618 }
619 if (sp->lcp.state != LCP_STATE_ACK_SENT) {
620 /* Go to closed state. */
621 sp->lcp.state = LCP_STATE_CLOSED;
622 sp->ipcp.state = IPCP_STATE_CLOSED;
623 }
624 /* The link will be renegotiated after timeout,
625 * to avoid endless req-nack loop. */
626 sppp_clear_timeout (sp);
627 sppp_set_timeout (sp, 2);
628 break;
629 case LCP_CONF_REJ:
630 if (h->ident != sp->lcp.confid)
631 break;
632 sppp_clear_timeout (sp);
633 /* Initiate renegotiation. */
634 sppp_lcp_open (sp);
635 if (sp->lcp.state != LCP_STATE_ACK_SENT) {
636 /* Go to closed state. */
637 sp->lcp.state = LCP_STATE_CLOSED;
638 sp->ipcp.state = IPCP_STATE_CLOSED;
639 }
640 break;
641 case LCP_TERM_REQ:
642 sppp_clear_timeout (sp);
643 /* Send Terminate-Ack packet. */
644 sppp_cp_send (sp, PPP_LCP, LCP_TERM_ACK, h->ident, 0, NULL);
645 /* Go to closed state. */
646 sp->lcp.state = LCP_STATE_CLOSED;
647 sp->ipcp.state = IPCP_STATE_CLOSED;
648 /* Initiate renegotiation. */
649 sppp_lcp_open (sp);
650 break;
651 case LCP_TERM_ACK:
652 case LCP_CODE_REJ:
653 case LCP_PROTO_REJ:
654 /* Ignore for now. */
655 break;
656 case LCP_DISC_REQ:
657 /* Discard the packet. */
658 break;
659 case LCP_ECHO_REQ:
660 if (sp->lcp.state != LCP_STATE_OPENED)
661 break;
662 if (len < 8) {
663 if (sp->pp_flags & PP_DEBUG)
664 printk (KERN_WARNING "%s: invalid lcp echo request packet length: %d bytes\n",
665 dev->name, len);
666 break;
667 }
668 if (ntohl (*(long*)(h+1)) == sp->lcp.magic) {
669 /* Line loopback mode detected. */
670 printk (KERN_WARNING "%s: loopback\n", dev->name);
671 if_down (dev);
672
673 /* Shut down the PPP link. */
674 sp->lcp.state = LCP_STATE_CLOSED;
675 sp->ipcp.state = IPCP_STATE_CLOSED;
676 sppp_clear_timeout (sp);
677 /* Initiate negotiation. */
678 sppp_lcp_open (sp);
679 break;
680 }
681 *(long*)(h+1) = htonl (sp->lcp.magic);
682 sppp_cp_send (sp, PPP_LCP, LCP_ECHO_REPLY, h->ident, len-4, h+1);
683 break;
684 case LCP_ECHO_REPLY:
685 if (h->ident != sp->lcp.echoid)
686 break;
687 if (len < 8) {
688 if (sp->pp_flags & PP_DEBUG)
689 printk (KERN_WARNING "%s: invalid lcp echo reply packet length: %d bytes\n",
690 dev->name, len);
691 break;
692 }
693 if (ntohl (*(long*)(h+1)) != sp->lcp.magic)
694 sp->pp_alivecnt = 0;
695 break;
696 }
697}
698
699/*
700 * Handle incoming Cisco keepalive protocol packets.
701 */
702
703static void sppp_cisco_input (struct sppp *sp, struct sk_buff *skb)
704{
705 struct cisco_packet *h;
706 struct net_device *dev = sp->pp_if;
707
708 if (!pskb_may_pull(skb, sizeof(struct cisco_packet))
709 || (skb->len != CISCO_PACKET_LEN
710 && skb->len != CISCO_BIG_PACKET_LEN)) {
711 if (sp->pp_flags & PP_DEBUG)
712 printk (KERN_WARNING "%s: invalid cisco packet length: %d bytes\n",
713 dev->name, skb->len);
714 return;
715 }
716 h = (struct cisco_packet *)skb->data;
717 skb_pull(skb, sizeof(struct cisco_packet*));
718 if (sp->pp_flags & PP_DEBUG)
719 printk (KERN_WARNING "%s: cisco input: %d bytes <%xh %xh %xh %xh %xh-%xh>\n",
720 dev->name, skb->len,
721 ntohl (h->type), h->par1, h->par2, h->rel,
722 h->time0, h->time1);
723 switch (ntohl (h->type)) {
724 default:
725 if (sp->pp_flags & PP_DEBUG)
726 printk (KERN_WARNING "%s: unknown cisco packet type: 0x%x\n",
727 dev->name, ntohl (h->type));
728 break;
729 case CISCO_ADDR_REPLY:
730 /* Reply on address request, ignore */
731 break;
732 case CISCO_KEEPALIVE_REQ:
733 sp->pp_alivecnt = 0;
734 sp->pp_rseq = ntohl (h->par1);
735 if (sp->pp_seq == sp->pp_rseq) {
736 /* Local and remote sequence numbers are equal.
737 * Probably, the line is in loopback mode. */
738 int newseq;
739 if (sp->pp_loopcnt >= MAXALIVECNT) {
740 printk (KERN_WARNING "%s: loopback\n",
741 dev->name);
742 sp->pp_loopcnt = 0;
743 if (dev->flags & IFF_UP) {
744 if_down (dev);
745 }
746 }
747 ++sp->pp_loopcnt;
748
749 /* Generate new local sequence number */
750 get_random_bytes(&newseq, sizeof(newseq));
751 sp->pp_seq ^= newseq;
752 break;
753 }
754 sp->pp_loopcnt = 0;
755 if (sp->pp_link_state==SPPP_LINK_DOWN &&
756 (dev->flags & IFF_UP)) {
757 sp->pp_link_state=SPPP_LINK_UP;
758 printk (KERN_INFO "%s: protocol up\n", dev->name);
759 }
760 break;
761 case CISCO_ADDR_REQ:
762 /* Stolen from net/ipv4/devinet.c -- SIOCGIFADDR ioctl */
763 {
764 struct in_device *in_dev;
765 struct in_ifaddr *ifa;
a144ea4b 766 __be32 addr = 0, mask = ~0; /* FIXME: is the mask correct? */
1da177e4
LT		 767#ifdef CONFIG_INET
768 rcu_read_lock();
e5ed6399 769 if ((in_dev = __in_dev_get_rcu(dev)) != NULL)
1da177e4
LT		 770 {
771 for (ifa=in_dev->ifa_list; ifa != NULL;
772 ifa=ifa->ifa_next) {
773 if (strcmp(dev->name, ifa->ifa_label) == 0)
774 {
775 addr = ifa->ifa_local;
776 mask = ifa->ifa_mask;
777 break;
778 }
779 }
780 }
781 rcu_read_unlock();
782#endif
783 /* I hope both addr and mask are in the net order */
784 sppp_cisco_send (sp, CISCO_ADDR_REPLY, addr, mask);
785 break;
786 }
787 }
788}
789
790
791/*
792 * Send PPP LCP packet.
793 */
794
795static void sppp_cp_send (struct sppp *sp, u16 proto, u8 type,
796 u8 ident, u16 len, void *data)
797{
798 struct ppp_header *h;
799 struct lcp_header *lh;
800 struct sk_buff *skb;
801 struct net_device *dev = sp->pp_if;
802
803 skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+LCP_HEADER_LEN+len,
804 GFP_ATOMIC);
805 if (skb==NULL)
806 return;
807
808 skb_reserve(skb,dev->hard_header_len);
809
810 h = (struct ppp_header *)skb_put(skb, sizeof(struct ppp_header));
811 h->address = PPP_ALLSTATIONS; /* broadcast address */
812 h->control = PPP_UI; /* Unnumbered Info */
813 h->protocol = htons (proto); /* Link Control Protocol */
814
815 lh = (struct lcp_header *)skb_put(skb, sizeof(struct lcp_header));
816 lh->type = type;
817 lh->ident = ident;
818 lh->len = htons (LCP_HEADER_LEN + len);
819
820 if (len)
821 memcpy(skb_put(skb,len),data, len);
822
823 if (sp->pp_flags & PP_DEBUG) {
824 printk (KERN_WARNING "%s: %s output <%s id=%xh len=%xh",
825 dev->name,
826 proto==PPP_LCP ? "lcp" : "ipcp",
827 proto==PPP_LCP ? sppp_lcp_type_name (lh->type) :
828 sppp_ipcp_type_name (lh->type), lh->ident,
829 ntohs (lh->len));
830 if (len)
831 sppp_print_bytes ((u8*) (lh+1), len);
832 printk (">\n");
833 }
834 sp->obytes += skb->len;
835 /* Control is high priority so it doesn't get queued behind data */
836 skb->priority=TC_PRIO_CONTROL;
837 skb->dev = dev;
838 skb_queue_tail(&tx_queue, skb);
839}
840
841/*
842 * Send Cisco keepalive packet.
843 */
844
845static void sppp_cisco_send (struct sppp *sp, int type, long par1, long par2)
846{
847 struct ppp_header *h;
848 struct cisco_packet *ch;
849 struct sk_buff *skb;
850 struct net_device *dev = sp->pp_if;
851 u32 t = jiffies * 1000/HZ;
852
853 skb=alloc_skb(dev->hard_header_len+PPP_HEADER_LEN+CISCO_PACKET_LEN,
854 GFP_ATOMIC);
855
856 if(skb==NULL)
857 return;
858
859 skb_reserve(skb, dev->hard_header_len);
860 h = (struct ppp_header *)skb_put (skb, sizeof(struct ppp_header));
861 h->address = CISCO_MULTICAST;
862 h->control = 0;
863 h->protocol = htons (CISCO_KEEPALIVE);
864
865 ch = (struct cisco_packet*)skb_put(skb, CISCO_PACKET_LEN);
866 ch->type = htonl (type);
867 ch->par1 = htonl (par1);
868 ch->par2 = htonl (par2);
869 ch->rel = -1;
870 ch->time0 = htons ((u16) (t >> 16));
871 ch->time1 = htons ((u16) t);
872
873 if (sp->pp_flags & PP_DEBUG)
874 printk (KERN_WARNING "%s: cisco output: <%xh %xh %xh %xh %xh-%xh>\n",
875 dev->name, ntohl (ch->type), ch->par1,
876 ch->par2, ch->rel, ch->time0, ch->time1);
877 sp->obytes += skb->len;
878 skb->priority=TC_PRIO_CONTROL;
879 skb->dev = dev;
880 skb_queue_tail(&tx_queue, skb);
881}
882
883/**
884 * sppp_close - close down a synchronous PPP or Cisco HDLC link
885 * @dev: The network device to drop the link of
886 *
887 * This drops the logical interface to the channel. It is not
888 * done politely as we assume we will also be dropping DTR. Any
889 * timeouts are killed.
890 */
891
892int sppp_close (struct net_device *dev)
893{
894 struct sppp *sp = (struct sppp *)sppp_of(dev);
895 unsigned long flags;
896
897 spin_lock_irqsave(&sp->lock, flags);
898 sp->pp_link_state = SPPP_LINK_DOWN;
899 sp->lcp.state = LCP_STATE_CLOSED;
900 sp->ipcp.state = IPCP_STATE_CLOSED;
901 sppp_clear_timeout (sp);
902 spin_unlock_irqrestore(&sp->lock, flags);
903
904 return 0;
905}
906
907EXPORT_SYMBOL(sppp_close);
908
909/**
910 * sppp_open - open a synchronous PPP or Cisco HDLC link
911 * @dev: Network device to activate
912 *
913 * Close down any existing synchronous session and commence
914 * from scratch. In the PPP case this means negotiating LCP/IPCP
915 * and friends, while for Cisco HDLC we simply need to start sending
916 * keepalives
917 */
918
919int sppp_open (struct net_device *dev)
920{
921 struct sppp *sp = (struct sppp *)sppp_of(dev);
922 unsigned long flags;
923
924 sppp_close(dev);
925
926 spin_lock_irqsave(&sp->lock, flags);
927 if (!(sp->pp_flags & PP_CISCO)) {
928 sppp_lcp_open (sp);
929 }
930 sp->pp_link_state = SPPP_LINK_DOWN;
931 spin_unlock_irqrestore(&sp->lock, flags);
932 sppp_flush_xmit();
933
934 return 0;
935}
936
937EXPORT_SYMBOL(sppp_open);
938
939/**
940 * sppp_reopen - notify of physical link loss
941 * @dev: Device that lost the link
942 *
943 * This function informs the synchronous protocol code that
944 * the underlying link died (for example a carrier drop on X.21)
945 *
946 * We increment the magic numbers to ensure that if the other end
947 * failed to notice we will correctly start a new session. It happens
948 * do to the nature of telco circuits is that you can lose carrier on
949 * one endonly.
950 *
951 * Having done this we go back to negotiating. This function may
952 * be called from an interrupt context.
953 */
954
955int sppp_reopen (struct net_device *dev)
956{
957 struct sppp *sp = (struct sppp *)sppp_of(dev);
958 unsigned long flags;
959
960 sppp_close(dev);
961
962 spin_lock_irqsave(&sp->lock, flags);
963 if (!(sp->pp_flags & PP_CISCO))
964 {
965 sp->lcp.magic = jiffies;
966 ++sp->pp_seq;
967 sp->lcp.state = LCP_STATE_CLOSED;
968 sp->ipcp.state = IPCP_STATE_CLOSED;
969 /* Give it a moment for the line to settle then go */
970 sppp_set_timeout (sp, 1);
971 }
972 sp->pp_link_state=SPPP_LINK_DOWN;
973 spin_unlock_irqrestore(&sp->lock, flags);
974
975 return 0;
976}
977
978EXPORT_SYMBOL(sppp_reopen);
979
980/**
981 * sppp_change_mtu - Change the link MTU
982 * @dev: Device to change MTU on
983 * @new_mtu: New MTU
984 *
985 * Change the MTU on the link. This can only be called with
986 * the link down. It returns an error if the link is up or
987 * the mtu is out of range.
988 */
989
7665a089 990static int sppp_change_mtu(struct net_device *dev, int new_mtu)
1da177e4
LT		 991{
992 if(new_mtu<128||new_mtu>PPP_MTU||(dev->flags&IFF_UP))
993 return -EINVAL;
994 dev->mtu=new_mtu;
995 return 0;
996}
997
1da177e4
LT		 998/**
999 * sppp_do_ioctl - Ioctl handler for ppp/hdlc
1000 * @dev: Device subject to ioctl
1001 * @ifr: Interface request block from the user
1002 * @cmd: Command that is being issued
1003 *
1004 * This function handles the ioctls that may be issued by the user
1005 * to control the settings of a PPP/HDLC link. It does both busy
1006 * and security checks. This function is intended to be wrapped by
1007 * callers who wish to add additional ioctl calls of their own.
1008 */
1009
1010int sppp_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1011{
1012 struct sppp *sp = (struct sppp *)sppp_of(dev);
1013
1014 if(dev->flags&IFF_UP)
1015 return -EBUSY;
1016
1017 if(!capable(CAP_NET_ADMIN))
1018 return -EPERM;
1019
1020 switch(cmd)
1021 {
1022 case SPPPIOCCISCO:
1023 sp->pp_flags|=PP_CISCO;
1024 dev->type = ARPHRD_HDLC;
1025 break;
1026 case SPPPIOCPPP:
1027 sp->pp_flags&=~PP_CISCO;
1028 dev->type = ARPHRD_PPP;
1029 break;
1030 case SPPPIOCDEBUG:
1031 sp->pp_flags&=~PP_DEBUG;
1032 if(ifr->ifr_flags)
1033 sp->pp_flags|=PP_DEBUG;
1034 break;
1035 case SPPPIOCGFLAGS:
1036 if(copy_to_user(ifr->ifr_data, &sp->pp_flags, sizeof(sp->pp_flags)))
1037 return -EFAULT;
1038 break;
1039 case SPPPIOCSFLAGS:
1040 if(copy_from_user(&sp->pp_flags, ifr->ifr_data, sizeof(sp->pp_flags)))
1041 return -EFAULT;
1042 break;
1043 default:
1044 return -EINVAL;
1045 }
1046 return 0;
1047}
1048
1049EXPORT_SYMBOL(sppp_do_ioctl);
1050
1051/**
1052 * sppp_attach - attach synchronous PPP/HDLC to a device
1053 * @pd: PPP device to initialise
1054 *
1055 * This initialises the PPP/HDLC support on an interface. At the
1056 * time of calling the dev element must point to the network device
1057 * that this interface is attached to. The interface should not yet
1058 * be registered.
1059 */
1060
1061void sppp_attach(struct ppp_device *pd)
1062{
1063 struct net_device *dev = pd->dev;
1064 struct sppp *sp = &pd->sppp;
1065 unsigned long flags;
1066
1067 /* Make sure embedding is safe for sppp_of */
1068 BUG_ON(sppp_of(dev) != sp);
1069
1070 spin_lock_irqsave(&spppq_lock, flags);
1071 /* Initialize keepalive handler. */
1072 if (! spppq)
1073 {
1074 init_timer(&sppp_keepalive_timer);
1075 sppp_keepalive_timer.expires=jiffies+10*HZ;
1076 sppp_keepalive_timer.function=sppp_keepalive;
1077 add_timer(&sppp_keepalive_timer);
1078 }
1079 /* Insert new entry into the keepalive list. */
1080 sp->pp_next = spppq;
1081 spppq = sp;
1082 spin_unlock_irqrestore(&spppq_lock, flags);
1083
1084 sp->pp_loopcnt = 0;
1085 sp->pp_alivecnt = 0;
1086 sp->pp_seq = 0;
1087 sp->pp_rseq = 0;
1088 sp->pp_flags = PP_KEEPALIVE|PP_CISCO|debug;/*PP_DEBUG;*/
1089 sp->lcp.magic = 0;
1090 sp->lcp.state = LCP_STATE_CLOSED;
1091 sp->ipcp.state = IPCP_STATE_CLOSED;
1092 sp->pp_if = dev;
1093 spin_lock_init(&sp->lock);
1094
1095 /*
1096 * Device specific setup. All but interrupt handler and
1097 * hard_start_xmit.
1098 */
1099
1100 dev->hard_header = sppp_hard_header;
1101 dev->rebuild_header = sppp_rebuild_header;
1102 dev->tx_queue_len = 10;
1103 dev->type = ARPHRD_HDLC;
1104 dev->addr_len = 0;
1105 dev->hard_header_len = sizeof(struct ppp_header);
1106 dev->mtu = PPP_MTU;
1107 /*
1108 * These 4 are callers but MUST also call sppp_ functions
1109 */
1110 dev->do_ioctl = sppp_do_ioctl;
1111#if 0
1112 dev->get_stats = NULL; /* Let the driver override these */
1113 dev->open = sppp_open;
1114 dev->stop = sppp_close;
1115#endif
1116 dev->change_mtu = sppp_change_mtu;
1117 dev->hard_header_cache = NULL;
1118 dev->header_cache_update = NULL;
1119 dev->flags = IFF_MULTICAST|IFF_POINTOPOINT|IFF_NOARP;
1120}
1121
1122EXPORT_SYMBOL(sppp_attach);
1123
1124/**
1125 * sppp_detach - release PPP resources from a device
1126 * @dev: Network device to release
1127 *
1128 * Stop and free up any PPP/HDLC resources used by this
1129 * interface. This must be called before the device is
1130 * freed.
1131 */
1132
1133void sppp_detach (struct net_device *dev)
1134{
1135 struct sppp **q, *p, *sp = (struct sppp *)sppp_of(dev);
1136 unsigned long flags;
1137
1138 spin_lock_irqsave(&spppq_lock, flags);
1139 /* Remove the entry from the keepalive list. */
1140 for (q = &spppq; (p = *q); q = &p->pp_next)
1141 if (p == sp) {
1142 *q = p->pp_next;
1143 break;
1144 }
1145
1146 /* Stop keepalive handler. */
1147 if (! spppq)
1148 del_timer(&sppp_keepalive_timer);
1149 sppp_clear_timeout (sp);
1150 spin_unlock_irqrestore(&spppq_lock, flags);
1151}
1152
1153EXPORT_SYMBOL(sppp_detach);
1154
1155/*
1156 * Analyze the LCP Configure-Request options list
1157 * for the presence of unknown options.
1158 * If the request contains unknown options, build and
1159 * send Configure-reject packet, containing only unknown options.
1160 */
1161static int
1162sppp_lcp_conf_parse_options (struct sppp *sp, struct lcp_header *h,
1163 int len, u32 *magic)
1164{
1165 u8 *buf, *r, *p;
1166 int rlen;
1167
1168 len -= 4;
1169 buf = r = kmalloc (len, GFP_ATOMIC);
1170 if (! buf)
1171 return (0);
1172
1173 p = (void*) (h+1);
1174 for (rlen=0; len>1 && p[1]; len-=p[1], p+=p[1]) {
1175 switch (*p) {
1176 case LCP_OPT_MAGIC:
1177 /* Magic number -- extract. */
1178 if (len >= 6 && p[1] == 6) {
1179 *magic = (u32)p[2] << 24 |
1180 (u32)p[3] << 16 | p[4] << 8 | p[5];
1181 continue;
1182 }
1183 break;
1184 case LCP_OPT_ASYNC_MAP:
1185 /* Async control character map -- check to be zero. */
1186 if (len >= 6 && p[1] == 6 && ! p[2] && ! p[3] &&
1187 ! p[4] && ! p[5])
1188 continue;
1189 break;
1190 case LCP_OPT_MRU:
1191 /* Maximum receive unit -- always OK. */
1192 continue;
1193 default:
1194 /* Others not supported. */
1195 break;
1196 }
1197 /* Add the option to rejected list. */
1198 memcpy(r, p, p[1]);
1199 r += p[1];
1200 rlen += p[1];
1201 }
1202 if (rlen)
1203 sppp_cp_send (sp, PPP_LCP, LCP_CONF_REJ, h->ident, rlen, buf);
1204 kfree(buf);
1205 return (rlen == 0);
1206}
1207
1208static void sppp_ipcp_input (struct sppp *sp, struct sk_buff *skb)
1209{
1210 struct lcp_header *h;
1211 struct net_device *dev = sp->pp_if;
1212 int len = skb->len;
1213
1214 if (!pskb_may_pull(skb, sizeof(struct lcp_header))) {
1215 if (sp->pp_flags & PP_DEBUG)
1216 printk (KERN_WARNING "%s: invalid ipcp packet length: %d bytes\n",
1217 dev->name, len);
1218 return;
1219 }
1220 h = (struct lcp_header *)skb->data;
1221 skb_pull(skb,sizeof(struct lcp_header));
1222 if (sp->pp_flags & PP_DEBUG) {
1223 printk (KERN_WARNING "%s: ipcp input: %d bytes <%s id=%xh len=%xh",
1224 dev->name, len,
1225 sppp_ipcp_type_name (h->type), h->ident, ntohs (h->len));
1226 if (len > 4)
1227 sppp_print_bytes ((u8*) (h+1), len-4);
1228 printk (">\n");
1229 }
1230 if (len > ntohs (h->len))
1231 len = ntohs (h->len);
1232 switch (h->type) {
1233 default:
1234 /* Unknown packet type -- send Code-Reject packet. */
1235 sppp_cp_send (sp, PPP_IPCP, IPCP_CODE_REJ, ++sp->pp_seq, len, h);
1236 break;
1237 case IPCP_CONF_REQ:
1238 if (len < 4) {
1239 if (sp->pp_flags & PP_DEBUG)
1240 printk (KERN_WARNING "%s: invalid ipcp configure request packet length: %d bytes\n",
1241 dev->name, len);
1242 return;
1243 }
1244 if (len > 4) {
1245 sppp_cp_send (sp, PPP_IPCP, LCP_CONF_REJ, h->ident,
1246 len-4, h+1);
1247
1248 switch (sp->ipcp.state) {
1249 case IPCP_STATE_OPENED:
1250 /* Initiate renegotiation. */
1251 sppp_ipcp_open (sp);
1252 /* fall through... */
1253 case IPCP_STATE_ACK_SENT:
1254 /* Go to closed state. */
1255 sp->ipcp.state = IPCP_STATE_CLOSED;
1256 }
1257 } else {
1258 /* Send Configure-Ack packet. */
1259 sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_ACK, h->ident,
1260 0, NULL);
1261 /* Change the state. */
1262 if (sp->ipcp.state == IPCP_STATE_ACK_RCVD)
1263 sp->ipcp.state = IPCP_STATE_OPENED;
1264 else
1265 sp->ipcp.state = IPCP_STATE_ACK_SENT;
1266 }
1267 break;
1268 case IPCP_CONF_ACK:
1269 if (h->ident != sp->ipcp.confid)
1270 break;
1271 sppp_clear_timeout (sp);
1272 switch (sp->ipcp.state) {
1273 case IPCP_STATE_CLOSED:
1274 sp->ipcp.state = IPCP_STATE_ACK_RCVD;
1275 sppp_set_timeout (sp, 5);
1276 break;
1277 case IPCP_STATE_ACK_SENT:
1278 sp->ipcp.state = IPCP_STATE_OPENED;
1279 break;
1280 }
1281 break;
1282 case IPCP_CONF_NAK:
1283 case IPCP_CONF_REJ:
1284 if (h->ident != sp->ipcp.confid)
1285 break;
1286 sppp_clear_timeout (sp);
1287 /* Initiate renegotiation. */
1288 sppp_ipcp_open (sp);
1289 if (sp->ipcp.state != IPCP_STATE_ACK_SENT)
1290 /* Go to closed state. */
1291 sp->ipcp.state = IPCP_STATE_CLOSED;
1292 break;
1293 case IPCP_TERM_REQ:
1294 /* Send Terminate-Ack packet. */
1295 sppp_cp_send (sp, PPP_IPCP, IPCP_TERM_ACK, h->ident, 0, NULL);
1296 /* Go to closed state. */
1297 sp->ipcp.state = IPCP_STATE_CLOSED;
1298 /* Initiate renegotiation. */
1299 sppp_ipcp_open (sp);
1300 break;
1301 case IPCP_TERM_ACK:
1302 /* Ignore for now. */
1303 case IPCP_CODE_REJ:
1304 /* Ignore for now. */
1305 break;
1306 }
1307}
1308
1309static void sppp_lcp_open (struct sppp *sp)
1310{
1311 char opt[6];
1312
1313 if (! sp->lcp.magic)
1314 sp->lcp.magic = jiffies;
1315 opt[0] = LCP_OPT_MAGIC;
1316 opt[1] = sizeof (opt);
1317 opt[2] = sp->lcp.magic >> 24;
1318 opt[3] = sp->lcp.magic >> 16;
1319 opt[4] = sp->lcp.magic >> 8;
1320 opt[5] = sp->lcp.magic;
1321 sp->lcp.confid = ++sp->pp_seq;
1322 sppp_cp_send (sp, PPP_LCP, LCP_CONF_REQ, sp->lcp.confid,
1323 sizeof (opt), &opt);
1324 sppp_set_timeout (sp, 2);
1325}
1326
1327static void sppp_ipcp_open (struct sppp *sp)
1328{
1329 sp->ipcp.confid = ++sp->pp_seq;
1330 sppp_cp_send (sp, PPP_IPCP, IPCP_CONF_REQ, sp->ipcp.confid, 0, NULL);
1331 sppp_set_timeout (sp, 2);
1332}
1333
1334/*
1335 * Process PPP control protocol timeouts.
1336 */
1337
1338static void sppp_cp_timeout (unsigned long arg)
1339{
1340 struct sppp *sp = (struct sppp*) arg;
1341 unsigned long flags;
1342
1343 spin_lock_irqsave(&sp->lock, flags);
1344
1345 sp->pp_flags &= ~PP_TIMO;
1346 if (! (sp->pp_if->flags & IFF_UP) || (sp->pp_flags & PP_CISCO)) {
1347 spin_unlock_irqrestore(&sp->lock, flags);
1348 return;
1349 }
1350 switch (sp->lcp.state) {
1351 case LCP_STATE_CLOSED:
1352 /* No ACK for Configure-Request, retry. */
1353 sppp_lcp_open (sp);
1354 break;
1355 case LCP_STATE_ACK_RCVD:
1356 /* ACK got, but no Configure-Request for peer, retry. */
1357 sppp_lcp_open (sp);
1358 sp->lcp.state = LCP_STATE_CLOSED;
1359 break;
1360 case LCP_STATE_ACK_SENT:
1361 /* ACK sent but no ACK for Configure-Request, retry. */
1362 sppp_lcp_open (sp);
1363 break;
1364 case LCP_STATE_OPENED:
1365 /* LCP is already OK, try IPCP. */
1366 switch (sp->ipcp.state) {
1367 case IPCP_STATE_CLOSED:
1368 /* No ACK for Configure-Request, retry. */
1369 sppp_ipcp_open (sp);
1370 break;
1371 case IPCP_STATE_ACK_RCVD:
1372 /* ACK got, but no Configure-Request for peer, retry. */
1373 sppp_ipcp_open (sp);
1374 sp->ipcp.state = IPCP_STATE_CLOSED;
1375 break;
1376 case IPCP_STATE_ACK_SENT:
1377 /* ACK sent but no ACK for Configure-Request, retry. */
1378 sppp_ipcp_open (sp);
1379 break;
1380 case IPCP_STATE_OPENED:
1381 /* IPCP is OK. */
1382 break;
1383 }
1384 break;
1385 }
1386 spin_unlock_irqrestore(&sp->lock, flags);
1387 sppp_flush_xmit();
1388}
1389
1390static char *sppp_lcp_type_name (u8 type)
1391{
1392 static char buf [8];
1393 switch (type) {
1394 case LCP_CONF_REQ: return ("conf-req");
1395 case LCP_CONF_ACK: return ("conf-ack");
1396 case LCP_CONF_NAK: return ("conf-nack");
1397 case LCP_CONF_REJ: return ("conf-rej");
1398 case LCP_TERM_REQ: return ("term-req");
1399 case LCP_TERM_ACK: return ("term-ack");
1400 case LCP_CODE_REJ: return ("code-rej");
1401 case LCP_PROTO_REJ: return ("proto-rej");
1402 case LCP_ECHO_REQ: return ("echo-req");
1403 case LCP_ECHO_REPLY: return ("echo-reply");
1404 case LCP_DISC_REQ: return ("discard-req");
1405 }
1406 sprintf (buf, "%xh", type);
1407 return (buf);
1408}
1409
1410static char *sppp_ipcp_type_name (u8 type)
1411{
1412 static char buf [8];
1413 switch (type) {
1414 case IPCP_CONF_REQ: return ("conf-req");
1415 case IPCP_CONF_ACK: return ("conf-ack");
1416 case IPCP_CONF_NAK: return ("conf-nack");
1417 case IPCP_CONF_REJ: return ("conf-rej");
1418 case IPCP_TERM_REQ: return ("term-req");
1419 case IPCP_TERM_ACK: return ("term-ack");
1420 case IPCP_CODE_REJ: return ("code-rej");
1421 }
1422 sprintf (buf, "%xh", type);
1423 return (buf);
1424}
1425
1426static void sppp_print_bytes (u_char *p, u16 len)
1427{
1428 printk (" %x", *p++);
1429 while (--len > 0)
1430 printk ("-%x", *p++);
1431}
1432
1433/**
1434 * sppp_rcv - receive and process a WAN PPP frame
1435 * @skb: The buffer to process
1436 * @dev: The device it arrived on
1437 * @p: Unused
344babaa 1438 * @orig_dev: Unused
1da177e4
LT		 1439 *
1440 * Protocol glue. This drives the deferred processing mode the poorer
1441 * cards use. This can be called directly by cards that do not have
1442 * timing constraints but is normally called from the network layer
1443 * after interrupt servicing to process frames queued via netif_rx.
1444 */
1445
f2ccd8fa 1446static int sppp_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p, struct net_device *orig_dev)
1da177e4
LT		 1447{
1448 if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
1449 return NET_RX_DROP;
1450 sppp_input(dev,skb);
1451 return 0;
1452}
1453
7665a089 1454static struct packet_type sppp_packet_type = {
1da177e4
LT		 1455 .type = __constant_htons(ETH_P_WAN_PPP),
1456 .func = sppp_rcv,
1457};
1458
1459static char banner[] __initdata =
1460 KERN_INFO "Cronyx Ltd, Synchronous PPP and CISCO HDLC (c) 1994\n"
1461 KERN_INFO "Linux port (c) 1998 Building Number Three Ltd & "
1462 "Jan \"Yenya\" Kasprzak.\n";
1463
1464static int __init sync_ppp_init(void)
1465{
1466 if(debug)
1467 debug=PP_DEBUG;
1468 printk(banner);
1469 skb_queue_head_init(&tx_queue);
1470 dev_add_pack(&sppp_packet_type);
1471 return 0;
1472}
1473
1474
1475static void __exit sync_ppp_cleanup(void)
1476{
1477 dev_remove_pack(&sppp_packet_type);
1478}
1479
1480module_init(sync_ppp_init);
1481module_exit(sync_ppp_cleanup);
1482module_param(debug, int, 0);
1483MODULE_LICENSE("GPL");
1484
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